[PATCH AUTOSEL 5.6 01/62] kbuild: avoid concurrency issue in parallel building dtbs and dtbs_check

[PATCH AUTOSEL 5.6 01/62] kbuild: avoid concurrency issue in parallel building dtbs and dtbs_check

[Sasha Levin]

From: Masahiro Yamada <masahiroy@kernel.org>

[ Upstream commit b5154bf63e5577faaaca1d942df274f7de91dd2a ]

'make dtbs_check' checks the shecma in addition to building *.dtb files,
in other words, 'make dtbs_check' is a super-set of 'make dtbs'.
So, you do not have to do 'make dtbs dtbs_check', but I want to keep
the build system as robust as possible in any use.

Currently, 'dtbs' and 'dtbs_check' are independent of each other.
In parallel building, two threads descend into arch/*/boot/dts/,
one for dtbs and the other for dtbs_check, then end up with building
the same DTB simultaneously.

This commit fixes the concurrency issue. Otherwise, I see build errors
like follows:

$ make ARCH=arm64 defconfig
$ make -j16 ARCH=arm64 DT_SCHEMA_FILES=Documentation/devicetree/bindings/arm/psci.yaml dtbs dtbs_check
  <snip>
  DTC     arch/arm64/boot/dts/qcom/sdm845-cheza-r2.dtb
  DTC     arch/arm64/boot/dts/amlogic/meson-gxl-s905x-p212.dtb
  DTC     arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb
  DTC     arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb
  DTC     arch/arm64/boot/dts/freescale/imx8mn-evk.dtb
  DTC     arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb
  DTC     arch/arm64/boot/dts/zte/zx296718-pcbox.dtb
  DTC     arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dt.yaml
  DTC     arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p230.dtb
  DTC     arch/arm64/boot/dts/xilinx/zynqmp-zc1254-revA.dtb
  DTC     arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dtb
  DTC     arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet-inx.dtb
  DTC     arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb
  CHECK   arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dt.yaml
fixdep: error opening file: arch/arm64/boot/dts/allwinner/.sun50i-h6-orangepi-lite2.dtb.d: No such file or directory
make[2]: *** [scripts/Makefile.lib:296: arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb] Error 2
make[2]: *** Deleting file 'arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb'
make[2]: *** Waiting for unfinished jobs....
  DTC     arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet-kd.dtb
  DTC     arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p231.dtb
  DTC     arch/arm64/boot/dts/xilinx/zynqmp-zc1275-revA.dtb
  DTC     arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dtb
fixdep: parse error; no targets found
make[2]: *** [scripts/Makefile.lib:296: arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb] Error 1
make[2]: *** Deleting file 'arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb'
make[1]: *** [scripts/Makefile.build:505: arch/arm64/boot/dts/allwinner] Error 2
make[1]: *** Waiting for unfinished jobs....
  DTC     arch/arm64/boot/dts/renesas/r8a77951-salvator-xs.dtb

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index d252219666fdd..6a8f0b278f1bb 100644
--- a/Makefile
+++ b/Makefile
@@ -1240,11 +1240,15 @@ ifneq ($(dtstree),)
 	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
 
 PHONY += dtbs dtbs_install dtbs_check
-dtbs dtbs_check: include/config/kernel.release scripts_dtc
+dtbs: include/config/kernel.release scripts_dtc
 	$(Q)$(MAKE) $(build)=$(dtstree)
 
+ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
+dtbs: dt_binding_check
+endif
+
 dtbs_check: export CHECK_DTBS=1
-dtbs_check: dt_binding_check
+dtbs_check: dtbs
 
 dtbs_install:
 	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
-- 
2.20.1

[PATCH AUTOSEL 5.6 02/62] net: drop_monitor: use IS_REACHABLE() to guard net_dm_hw_report()

[Sasha Levin]

From: Masahiro Yamada <masahiroy@kernel.org>

[ Upstream commit 1cd9b3abf5332102d4d967555e7ed861a75094bf ]

In net/Kconfig, NET_DEVLINK implies NET_DROP_MONITOR.

The original behavior of the 'imply' keyword prevents NET_DROP_MONITOR
from being 'm' when NET_DEVLINK=y.

With the planned Kconfig change that relaxes the 'imply', the
combination of NET_DEVLINK=y and NET_DROP_MONITOR=m would be allowed.

Use IS_REACHABLE() to avoid the vmlinux link error for this case.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/net/drop_monitor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/drop_monitor.h b/include/net/drop_monitor.h
index 2ab668461463e..f68bc373544a9 100644
--- a/include/net/drop_monitor.h
+++ b/include/net/drop_monitor.h
@@ -19,7 +19,7 @@ struct net_dm_hw_metadata {
 	struct net_device *input_dev;
 };
 
-#if IS_ENABLED(CONFIG_NET_DROP_MONITOR)
+#if IS_REACHABLE(CONFIG_NET_DROP_MONITOR)
 void net_dm_hw_report(struct sk_buff *skb,
 		      const struct net_dm_hw_metadata *hw_metadata);
 #else
-- 
2.20.1

[PATCH AUTOSEL 5.6 03/62] Makefile: disallow data races on gcc-10 as well

[Sasha Levin]

From: Sergei Trofimovich <slyfox@gentoo.org>

[ Upstream commit b1112139a103b4b1101d0d2d72931f2d33d8c978 ]

gcc-10 will rename --param=allow-store-data-races=0
to -fno-allow-store-data-races.

The flag change happened at https://gcc.gnu.org/PR92046.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 6a8f0b278f1bb..744245f0c96cf 100644
--- a/Makefile
+++ b/Makefile
@@ -714,6 +714,7 @@ endif
 
 # Tell gcc to never replace conditional load with a non-conditional one
 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
+KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
 
 include scripts/Makefile.kcov
 include scripts/Makefile.gcc-plugins
-- 
2.20.1

[PATCH AUTOSEL 5.6 04/62] gcc-common.h: Update for GCC 10

[Sasha Levin]

From: Frédéric Pierret (fepitre) <frederic.pierret@qubes-os.org>

[ Upstream commit c7527373fe28f97d8a196ab562db5589be0d34b9 ]

Remove "params.h" include, which has been dropped in GCC 10.

Remove is_a_helper() macro, which is now defined in gimple.h, as seen
when running './scripts/gcc-plugin.sh g++ g++ gcc':

In file included from <stdin>:1:
./gcc-plugins/gcc-common.h:852:13: error: redefinition of ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const ggoto*]’
  852 | inline bool is_a_helper<const ggoto *>::test(const_gimple gs)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ./gcc-plugins/gcc-common.h:125,
                 from <stdin>:1:
/usr/lib/gcc/x86_64-redhat-linux/10/plugin/include/gimple.h:1037:1: note: ‘static bool is_a_helper<T>::test(U*) [with U = const gimple; T = const ggoto*]’ previously declared here
 1037 | is_a_helper <const ggoto *>::test (const gimple *gs)
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Add -Wno-format-diag to scripts/gcc-plugins/Makefile to avoid
meaningless warnings from error() formats used by plugins:

scripts/gcc-plugins/structleak_plugin.c: In function ‘int plugin_init(plugin_name_args*, plugin_gcc_version*)’:
scripts/gcc-plugins/structleak_plugin.c:253:12: warning: unquoted sequence of 2 consecutive punctuation characters ‘'-’ in format [-Wformat-diag]
  253 |   error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Frédéric Pierret (fepitre) <frederic.pierret@qubes-os.org>
Link: https://lore.kernel.org/r/20200407113259.270172-1-frederic.pierret@qubes-os.org
[kees: include -Wno-format-diag for plugin builds]
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 scripts/gcc-plugins/Makefile     | 1 +
 scripts/gcc-plugins/gcc-common.h | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
index f2ee8bd7abc62..1d0b9382e759d 100644
--- a/scripts/gcc-plugins/Makefile
+++ b/scripts/gcc-plugins/Makefile
@@ -11,6 +11,7 @@ else
   HOST_EXTRACXXFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu++98 -fno-rtti
   HOST_EXTRACXXFLAGS += -fno-exceptions -fasynchronous-unwind-tables -ggdb
   HOST_EXTRACXXFLAGS += -Wno-narrowing -Wno-unused-variable
+  HOST_EXTRACXXFLAGS += -Wno-format-diag
   export HOST_EXTRACXXFLAGS
 endif
 
diff --git a/scripts/gcc-plugins/gcc-common.h b/scripts/gcc-plugins/gcc-common.h
index 17f06079a7123..9ad76b7f3f10e 100644
--- a/scripts/gcc-plugins/gcc-common.h
+++ b/scripts/gcc-plugins/gcc-common.h
@@ -35,7 +35,9 @@
 #include "ggc.h"
 #include "timevar.h"
 
+#if BUILDING_GCC_VERSION < 10000
 #include "params.h"
+#endif
 
 #if BUILDING_GCC_VERSION <= 4009
 #include "pointer-set.h"
@@ -847,6 +849,7 @@ static inline gimple gimple_build_assign_with_ops(enum tree_code subcode, tree l
 	return gimple_build_assign(lhs, subcode, op1, op2 PASS_MEM_STAT);
 }
 
+#if BUILDING_GCC_VERSION < 10000
 template <>
 template <>
 inline bool is_a_helper<const ggoto *>::test(const_gimple gs)
@@ -860,6 +863,7 @@ inline bool is_a_helper<const greturn *>::test(const_gimple gs)
 {
 	return gs->code == GIMPLE_RETURN;
 }
+#endif
 
 static inline gasm *as_a_gasm(gimple stmt)
 {
-- 
2.20.1

[PATCH AUTOSEL 5.6 05/62] HID: multitouch: add eGalaxTouch P80H84 support

[Sasha Levin]

From: Sebastian Reichel <sebastian.reichel@collabora.com>

[ Upstream commit f9e82295eec141a0569649d400d249333d74aa91 ]

Add support for P80H84 touchscreen from eGalaxy:

  idVendor           0x0eef D-WAV Scientific Co., Ltd
  idProduct          0xc002
  iManufacturer           1 eGalax Inc.
  iProduct                2 eGalaxTouch P80H84 2019 vDIVA_1204_T01 k4.02.146

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-ids.h        | 1 +
 drivers/hid/hid-multitouch.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 9f22134265565..309510a72c5e1 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -385,6 +385,7 @@
 #define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_7349	0x7349
 #define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_73F7	0x73f7
 #define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001	0xa001
+#define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_C002	0xc002
 
 #define USB_VENDOR_ID_ELAN		0x04f3
 #define USB_DEVICE_ID_TOSHIBA_CLICK_L9W	0x0401
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 362805ddf3777..03c720b473063 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1922,6 +1922,9 @@ static const struct hid_device_id mt_devices[] = {
 	{ .driver_data = MT_CLS_EGALAX_SERIAL,
 		MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
 			USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_A001) },
+	{ .driver_data = MT_CLS_EGALAX,
+		MT_USB_DEVICE(USB_VENDOR_ID_DWAV,
+			USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH_C002) },
 
 	/* Elitegroup panel */
 	{ .driver_data = MT_CLS_SERIAL,
-- 
2.20.1

[PATCH AUTOSEL 5.6 06/62] HID: logitech: Add support for Logitech G11 extra keys

[Sasha Levin]

From: Fabian Schindlatz <fabian.schindlatz@fau.de>

[ Upstream commit b1bd0f75288f60e8d142a1b3e979ed0192c04931 ]

The Logitech G11 keyboard is a cheap variant of the G15 without the LCD
screen. It uses the same layout for its extra and macro keys (G1 - G18,
M1-M3, MR) and - from the input subsystem's perspective - behaves just
like the G15, so we can treat it as such.

Tested it with my own keyboard.

Signed-off-by: Fabian Schindlatz <fabian.schindlatz@fau.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-ids.h    | 1 +
 drivers/hid/hid-lg-g15.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 309510a72c5e1..40697af0ca358 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -756,6 +756,7 @@
 #define USB_DEVICE_ID_LOGITECH_RUMBLEPAD2	0xc218
 #define USB_DEVICE_ID_LOGITECH_RUMBLEPAD2_2	0xc219
 #define USB_DEVICE_ID_LOGITECH_G15_LCD		0xc222
+#define USB_DEVICE_ID_LOGITECH_G11		0xc225
 #define USB_DEVICE_ID_LOGITECH_G15_V2_LCD	0xc227
 #define USB_DEVICE_ID_LOGITECH_G510		0xc22d
 #define USB_DEVICE_ID_LOGITECH_G510_USB_AUDIO	0xc22e
diff --git a/drivers/hid/hid-lg-g15.c b/drivers/hid/hid-lg-g15.c
index ad4b5412a9f49..ef0cbcd7540d5 100644
--- a/drivers/hid/hid-lg-g15.c
+++ b/drivers/hid/hid-lg-g15.c
@@ -872,6 +872,10 @@ static int lg_g15_probe(struct hid_device *hdev, const struct hid_device_id *id)
 }
 
 static const struct hid_device_id lg_g15_devices[] = {
+	/* The G11 is a G15 without the LCD, treat it as a G15 */
+	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
+		USB_DEVICE_ID_LOGITECH_G11),
+		.driver_data = LG_G15 },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH,
 			 USB_DEVICE_ID_LOGITECH_G15_LCD),
 		.driver_data = LG_G15 },
-- 
2.20.1

[PATCH AUTOSEL 5.6 07/62] HID: alps: Add AUI1657 device ID

[Sasha Levin]

From: Artem Borisov <dedsa2002@gmail.com>

[ Upstream commit 640e403b1fd24e7f31ac6f29f0b6a21d285ed729 ]

This device is used on Lenovo V130-15IKB variants and uses
the same registers as U1.

Signed-off-by: Artem Borisov <dedsa2002@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-alps.c | 1 +
 drivers/hid/hid-ids.h  | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-alps.c b/drivers/hid/hid-alps.c
index fa704153cb00d..c2a2bd5288906 100644
--- a/drivers/hid/hid-alps.c
+++ b/drivers/hid/hid-alps.c
@@ -802,6 +802,7 @@ static int alps_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		break;
 	case HID_DEVICE_ID_ALPS_U1_DUAL:
 	case HID_DEVICE_ID_ALPS_U1:
+	case HID_DEVICE_ID_ALPS_1657:
 		data->dev_type = U1;
 		break;
 	default:
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 40697af0ca358..7d769ca864a7f 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -81,7 +81,7 @@
 #define HID_DEVICE_ID_ALPS_U1		0x1215
 #define HID_DEVICE_ID_ALPS_T4_BTNLESS	0x120C
 #define HID_DEVICE_ID_ALPS_1222		0x1222
-
+#define HID_DEVICE_ID_ALPS_1657         0x121E
 
 #define USB_VENDOR_ID_AMI		0x046b
 #define USB_DEVICE_ID_AMI_VIRT_KEYBOARD_AND_MOUSE	0xff10
-- 
2.20.1

[PATCH AUTOSEL 5.6 08/62] HID: alps: ALPS_1657 is too specific; use U1_UNICORN_LEGACY instead

[Sasha Levin]

From: Jiri Kosina <jkosina@suse.cz>

[ Upstream commit 185af3e775b693f773d9a4b5a8c3cda69fc8ca0f ]

HID_DEVICE_ID_ALPS_1657 PID is too specific, as there are many other
ALPS hardware IDs using this particular touchpad.

Rename the identifier to HID_DEVICE_ID_ALPS_U1_UNICORN_LEGACY in order
to describe reality better.

Fixes: 640e403b1fd24 ("HID: alps: Add AUI1657 device ID")
Reported-by: Xiaojian Cao <xiaojian.cao@cn.alps.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-alps.c | 2 +-
 drivers/hid/hid-ids.h  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-alps.c b/drivers/hid/hid-alps.c
index c2a2bd5288906..b2ad319a74b9a 100644
--- a/drivers/hid/hid-alps.c
+++ b/drivers/hid/hid-alps.c
@@ -802,7 +802,7 @@ static int alps_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		break;
 	case HID_DEVICE_ID_ALPS_U1_DUAL:
 	case HID_DEVICE_ID_ALPS_U1:
-	case HID_DEVICE_ID_ALPS_1657:
+	case HID_DEVICE_ID_ALPS_U1_UNICORN_LEGACY:
 		data->dev_type = U1;
 		break;
 	default:
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 7d769ca864a7f..b3cc26ca375fd 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -79,9 +79,9 @@
 #define HID_DEVICE_ID_ALPS_U1_DUAL_PTP	0x121F
 #define HID_DEVICE_ID_ALPS_U1_DUAL_3BTN_PTP	0x1220
 #define HID_DEVICE_ID_ALPS_U1		0x1215
+#define HID_DEVICE_ID_ALPS_U1_UNICORN_LEGACY         0x121E
 #define HID_DEVICE_ID_ALPS_T4_BTNLESS	0x120C
 #define HID_DEVICE_ID_ALPS_1222		0x1222
-#define HID_DEVICE_ID_ALPS_1657         0x121E
 
 #define USB_VENDOR_ID_AMI		0x046b
 #define USB_DEVICE_ID_AMI_VIRT_KEYBOARD_AND_MOUSE	0xff10
-- 
2.20.1

[PATCH AUTOSEL 5.6 09/62] phy: tegra: Select USB_COMMON for usb_get_maximum_speed()

[Sasha Levin]

From: Thierry Reding <treding@nvidia.com>

[ Upstream commit 0d5c9bc7c68009af04bbadf22306467674c6fb90 ]

The usb_get_maximum_speed() function is part of the usb-common module,
so enable it by selecting the corresponding Kconfig symbol.

While at it, also make sure to depend on USB_SUPPORT because USB_PHY
requires that. This can lead to Kconfig conflicts if USB_SUPPORT is not
enabled while attempting to enable PHY_TEGRA_XUSB.

Reported-by: kbuild test robot <lkp@intel.com>
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200330101038.2422389-1-thierry.reding@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/phy/tegra/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig
index f9817c3ae85f0..2e66a123f5a2c 100644
--- a/drivers/phy/tegra/Kconfig
+++ b/drivers/phy/tegra/Kconfig
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config PHY_TEGRA_XUSB
 	tristate "NVIDIA Tegra XUSB pad controller driver"
-	depends on ARCH_TEGRA
+	depends on ARCH_TEGRA && USB_SUPPORT
+	select USB_COMMON
 	help
 	  Choose this option if you have an NVIDIA Tegra SoC.
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 10/62] scsi: qla2xxx: Fix hang when issuing nvme disconnect-all in NPIV

[Sasha Levin]

From: Arun Easi <aeasi@marvell.com>

[ Upstream commit 45a76264c26fd8cfd0c9746196892d9b7e2657ee ]

In NPIV environment, a NPIV host may use a queue pair created by base host
or other NPIVs, so the check for a queue pair created by this NPIV is not
correct, and can cause an abort to fail, which in turn means the NVME
command not returned.  This leads to hang in nvme_fc layer in
nvme_fc_delete_association() which waits for all I/Os to be returned, which
is seen as hang in the application.

Link: https://lore.kernel.org/r/20200331104015.24868-3-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/qla2xxx/qla_mbx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index 9e09964f5c0e4..7b341e41bb853 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -3117,7 +3117,7 @@ qla24xx_abort_command(srb_t *sp)
 	ql_dbg(ql_dbg_mbx + ql_dbg_verbose, vha, 0x108c,
 	    "Entered %s.\n", __func__);
 
-	if (vha->flags.qpairs_available && sp->qpair)
+	if (sp->qpair)
 		req = sp->qpair->req;
 	else
 		return QLA_FUNCTION_FAILED;
-- 
2.20.1

[PATCH AUTOSEL 5.6 11/62] scsi: qla2xxx: Delete all sessions before unregister local nvme port

[Sasha Levin]

From: Quinn Tran <qutran@marvell.com>

[ Upstream commit c48f849d3f7a4ec1025105f446e29d395c4dcc2f ]

Delete all sessions before unregistering local nvme port.  This allows nvme
layer to decrement all active rport count down to zero.  Once the count is
down to zero, nvme would call qla to continue with the npiv port deletion.

PID: 27448  TASK: ffff9e34b777c1c0  CPU: 0   COMMAND: "qaucli"
 0 [ffff9e25e84abbd8] __schedule at ffffffff977858ca
 1 [ffff9e25e84abc68] schedule at ffffffff97785d79
 2 [ffff9e25e84abc78] schedule_timeout at ffffffff97783881
 3 [ffff9e25e84abd28] wait_for_completion at ffffffff9778612d
 4 [ffff9e25e84abd88] qla_nvme_delete at ffffffffc0e3024e [qla2xxx]
 5 [ffff9e25e84abda8] qla24xx_vport_delete at ffffffffc0e024b9 [qla2xxx]
 6 [ffff9e25e84abdf0] fc_vport_terminate at ffffffffc011c247 [scsi_transport_fc]
 7 [ffff9e25e84abe28] store_fc_host_vport_delete at ffffffffc011cd94 [scsi_transport_fc]
 8 [ffff9e25e84abe70] dev_attr_store at ffffffff974b376b
 9 [ffff9e25e84abe80] sysfs_kf_write at ffffffff972d9a92
10 [ffff9e25e84abe90] kernfs_fop_write at ffffffff972d907b
11 [ffff9e25e84abec8] vfs_write at ffffffff9724c790
12 [ffff9e25e84abf08] sys_write at ffffffff9724d55f
13 [ffff9e25e84abf50] system_call_fastpath at ffffffff97792ed2
    RIP: 00007fc0bd81a6fd  RSP: 00007ffff78d9648  RFLAGS: 00010202
    RAX: 0000000000000001  RBX: 0000000000000022  RCX: 00007ffff78d96e0
    RDX: 0000000000000022  RSI: 00007ffff78d94e0  RDI: 0000000000000008
    RBP: 00007ffff78d9440   R8: 0000000000000000   R9: 00007fc0bd48b2cd
    R10: 0000000000000017  R11: 0000000000000293  R12: 0000000000000000
    R13: 00005624e4dac840  R14: 00005624e4da9a10  R15: 0000000000000000
    ORIG_RAX: 0000000000000001  CS: 0033  SS: 002b

Link: https://lore.kernel.org/r/20200331104015.24868-4-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/qla2xxx/qla_attr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index d7e7043f9eab2..9556392652e33 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -2928,11 +2928,11 @@ qla24xx_vport_delete(struct fc_vport *fc_vport)
 	    test_bit(FCPORT_UPDATE_NEEDED, &vha->dpc_flags))
 		msleep(1000);
 
-	qla_nvme_delete(vha);
 
 	qla24xx_disable_vp(vha);
 	qla2x00_wait_for_sess_deletion(vha);
 
+	qla_nvme_delete(vha);
 	vha->flags.delete_progress = 1;
 
 	qlt_remove_target(ha, vha);
-- 
2.20.1

[PATCH AUTOSEL 5.6 12/62] configfs: fix config_item refcnt leak in configfs_rmdir()

[Sasha Levin]

From: Xiyu Yang <xiyuyang19@fudan.edu.cn>

[ Upstream commit 8aebfffacfa379ba400da573a5bf9e49634e38cb ]

configfs_rmdir() invokes configfs_get_config_item(), which returns a
reference of the specified config_item object to "parent_item" with
increased refcnt.

When configfs_rmdir() returns, local variable "parent_item" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one exception handling path of
configfs_rmdir(). When down_write_killable() fails, the function forgets
to decrease the refcnt increased by configfs_get_config_item(), causing
a refcnt leak.

Fix this issue by calling config_item_put() when down_write_killable()
fails.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/configfs/dir.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index cf7b7e1d5bd72..cb733652ecca6 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1519,6 +1519,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
 		spin_lock(&configfs_dirent_lock);
 		configfs_detach_rollback(dentry);
 		spin_unlock(&configfs_dirent_lock);
+		config_item_put(parent_item);
 		return -EINTR;
 	}
 	frag->frag_dead = true;
-- 
2.20.1

[PATCH AUTOSEL 5.6 13/62] vhost/vsock: fix packet delivery order to monitoring devices

[Sasha Levin]

From: Stefano Garzarella <sgarzare@redhat.com>

[ Upstream commit 107bc0766b9feb5113074c753735a3f115c2141f ]

We want to deliver packets to monitoring devices before it is
put in the virtqueue, to avoid that replies can appear in the
packet capture before the transmitted packet.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/vhost/vsock.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index bb3f63386b475..53294c2f8cff4 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -181,14 +181,14 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 			break;
 		}
 
-		vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
-		added = true;
-
-		/* Deliver to monitoring devices all correctly transmitted
-		 * packets.
+		/* Deliver to monitoring devices all packets that we
+		 * will transmit.
 		 */
 		virtio_transport_deliver_tap_pkt(pkt);
 
+		vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
+		added = true;
+
 		pkt->off += payload_len;
 		total_len += payload_len;
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 13/62] vhost/vsock: fix packet delivery order to monitoring devices

[Sasha Levin]

From: Stefano Garzarella <sgarzare@redhat.com>

[ Upstream commit 107bc0766b9feb5113074c753735a3f115c2141f ]

We want to deliver packets to monitoring devices before it is
put in the virtqueue, to avoid that replies can appear in the
packet capture before the transmitted packet.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/vhost/vsock.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index bb3f63386b475..53294c2f8cff4 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -181,14 +181,14 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 			break;
 		}
 
-		vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
-		added = true;
-
-		/* Deliver to monitoring devices all correctly transmitted
-		 * packets.
+		/* Deliver to monitoring devices all packets that we
+		 * will transmit.
 		 */
 		virtio_transport_deliver_tap_pkt(pkt);
 
+		vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
+		added = true;
+
 		pkt->off += payload_len;
 		total_len += payload_len;
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 14/62] aquantia: Fix the media type of AQC100 ethernet controller in the driver

[Sasha Levin]

From: Richard Clark <richard.xnu.clark@gmail.com>

[ Upstream commit 6de556c31061e3b9c36546ffaaac5fdb679a2f14 ]

The Aquantia AQC100 controller enables a SFP+ port, so the driver should
configure the media type as '_TYPE_FIBRE' instead of '_TYPE_TP'.

Signed-off-by: Richard Clark <richard.xnu.clark@gmail.com>
Cc: Igor Russkikh <irusskikh@marvell.com>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
index 78b6f32487565..e0625c67eed33 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
@@ -56,7 +56,7 @@ static const struct aq_board_revision_s hw_atl_boards[] = {
 	{ AQ_DEVICE_ID_D108,	AQ_HWREV_2,	&hw_atl_ops_b0, &hw_atl_b0_caps_aqc108, },
 	{ AQ_DEVICE_ID_D109,	AQ_HWREV_2,	&hw_atl_ops_b0, &hw_atl_b0_caps_aqc109, },
 
-	{ AQ_DEVICE_ID_AQC100,	AQ_HWREV_ANY,	&hw_atl_ops_b1, &hw_atl_b0_caps_aqc107, },
+	{ AQ_DEVICE_ID_AQC100,	AQ_HWREV_ANY,	&hw_atl_ops_b1, &hw_atl_b0_caps_aqc100, },
 	{ AQ_DEVICE_ID_AQC107,	AQ_HWREV_ANY,	&hw_atl_ops_b1, &hw_atl_b0_caps_aqc107, },
 	{ AQ_DEVICE_ID_AQC108,	AQ_HWREV_ANY,	&hw_atl_ops_b1, &hw_atl_b0_caps_aqc108, },
 	{ AQ_DEVICE_ID_AQC109,	AQ_HWREV_ANY,	&hw_atl_ops_b1, &hw_atl_b0_caps_aqc109, },
-- 
2.20.1

[PATCH AUTOSEL 5.6 15/62] net/sonic: Fix a resource leak in an error handling path in 'jazz_sonic_probe()'

[Sasha Levin]

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit 10e3cc180e64385edc9890c6855acf5ed9ca1339 ]

A call to 'dma_alloc_coherent()' is hidden in 'sonic_alloc_descriptors()',
called from 'sonic_probe1()'.

This is correctly freed in the remove function, but not in the error
handling path of the probe function.
Fix it and add the missing 'dma_free_coherent()' call.

While at it, rename a label in order to be slightly more informative.

Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/natsemi/jazzsonic.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/natsemi/jazzsonic.c b/drivers/net/ethernet/natsemi/jazzsonic.c
index 51fa82b429a3c..40970352d2082 100644
--- a/drivers/net/ethernet/natsemi/jazzsonic.c
+++ b/drivers/net/ethernet/natsemi/jazzsonic.c
@@ -235,11 +235,13 @@ static int jazz_sonic_probe(struct platform_device *pdev)
 
 	err = register_netdev(dev);
 	if (err)
-		goto out1;
+		goto undo_probe1;
 
 	return 0;
 
-out1:
+undo_probe1:
+	dma_free_coherent(lp->device, SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
+			  lp->descriptors, lp->descriptors_laddr);
 	release_mem_region(dev->base_addr, SONIC_MEM_SIZE);
 out:
 	free_netdev(dev);
-- 
2.20.1

[PATCH AUTOSEL 5.6 16/62] most: core: use function subsys_initcall()

[Sasha Levin]

From: Christian Gromm <christian.gromm@microchip.com>

[ Upstream commit 5e56bc06e18dfc8a66180fa369384b36e2ab621a ]

This patch replaces function module_init() with subsys_initcall().
It is needed to ensure that the core module of the driver is
initialized before a component tries to register with the core. This
leads to a NULL pointer dereference if the driver is configured as
in-tree.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/1587741394-22021-1-git-send-email-christian.gromm@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/staging/most/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
index 0c4ae6920d77d..409c48c597f2f 100644
--- a/drivers/staging/most/core.c
+++ b/drivers/staging/most/core.c
@@ -1484,7 +1484,7 @@ static void __exit most_exit(void)
 	ida_destroy(&mdev_id);
 }
 
-module_init(most_init);
+subsys_initcall(most_init);
 module_exit(most_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
-- 
2.20.1

[PATCH AUTOSEL 5.6 16/62] most: core: use function subsys_initcall()

[Sasha Levin]

From: Christian Gromm <christian.gromm@microchip.com>

[ Upstream commit 5e56bc06e18dfc8a66180fa369384b36e2ab621a ]

This patch replaces function module_init() with subsys_initcall().
It is needed to ensure that the core module of the driver is
initialized before a component tries to register with the core. This
leads to a NULL pointer dereference if the driver is configured as
in-tree.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/1587741394-22021-1-git-send-email-christian.gromm@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/staging/most/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
index 0c4ae6920d77d..409c48c597f2f 100644
--- a/drivers/staging/most/core.c
+++ b/drivers/staging/most/core.c
@@ -1484,7 +1484,7 @@ static void __exit most_exit(void)
 	ida_destroy(&mdev_id);
 }
 
-module_init(most_init);
+subsys_initcall(most_init);
 module_exit(most_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
-- 
2.20.1

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Re: [PATCH AUTOSEL 5.6 16/62] most: core: use function subsys_initcall()

[Greg Kroah-Hartman]

On Thu, May 14, 2020 at 02:51:01PM -0400, Sasha Levin wrote:
> From: Christian Gromm <christian.gromm@microchip.com>
> 
> [ Upstream commit 5e56bc06e18dfc8a66180fa369384b36e2ab621a ]
> 
> This patch replaces function module_init() with subsys_initcall().
> It is needed to ensure that the core module of the driver is
> initialized before a component tries to register with the core. This
> leads to a NULL pointer dereference if the driver is configured as
> in-tree.
> 
> Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Link: https://lore.kernel.org/r/1587741394-22021-1-git-send-email-christian.gromm@microchip.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>  drivers/staging/most/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
> index 0c4ae6920d77d..409c48c597f2f 100644
> --- a/drivers/staging/most/core.c
> +++ b/drivers/staging/most/core.c
> @@ -1484,7 +1484,7 @@ static void __exit most_exit(void)
>  	ida_destroy(&mdev_id);
>  }
>  
> -module_init(most_init);
> +subsys_initcall(most_init);
>  module_exit(most_exit);
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");

This is not needed in 5.6 and older kernels due to the most/core.c code
being in staging for these releases.  It only became an issue when it
moved out of staging.

So please drop this from here and any older trees you might have
selected it for.

thanks,

greg k-h

Re: [PATCH AUTOSEL 5.6 16/62] most: core: use function subsys_initcall()

[Greg Kroah-Hartman]

On Thu, May 14, 2020 at 02:51:01PM -0400, Sasha Levin wrote:
> From: Christian Gromm <christian.gromm@microchip.com>
> 
> [ Upstream commit 5e56bc06e18dfc8a66180fa369384b36e2ab621a ]
> 
> This patch replaces function module_init() with subsys_initcall().
> It is needed to ensure that the core module of the driver is
> initialized before a component tries to register with the core. This
> leads to a NULL pointer dereference if the driver is configured as
> in-tree.
> 
> Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Link: https://lore.kernel.org/r/1587741394-22021-1-git-send-email-christian.gromm@microchip.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>  drivers/staging/most/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
> index 0c4ae6920d77d..409c48c597f2f 100644
> --- a/drivers/staging/most/core.c
> +++ b/drivers/staging/most/core.c
> @@ -1484,7 +1484,7 @@ static void __exit most_exit(void)
>  	ida_destroy(&mdev_id);
>  }
>  
> -module_init(most_init);
> +subsys_initcall(most_init);
>  module_exit(most_exit);
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");

This is not needed in 5.6 and older kernels due to the most/core.c code
being in staging for these releases.  It only became an issue when it
moved out of staging.

So please drop this from here and any older trees you might have
selected it for.

thanks,

greg k-h
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Re: [PATCH AUTOSEL 5.6 16/62] most: core: use function subsys_initcall()

[Sasha Levin]

On Fri, May 15, 2020 at 08:59:14AM +0200, Greg Kroah-Hartman wrote:
>On Thu, May 14, 2020 at 02:51:01PM -0400, Sasha Levin wrote:
>> From: Christian Gromm <christian.gromm@microchip.com>
>>
>> [ Upstream commit 5e56bc06e18dfc8a66180fa369384b36e2ab621a ]
>>
>> This patch replaces function module_init() with subsys_initcall().
>> It is needed to ensure that the core module of the driver is
>> initialized before a component tries to register with the core. This
>> leads to a NULL pointer dereference if the driver is configured as
>> in-tree.
>>
>> Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
>> Reported-by: kernel test robot <lkp@intel.com>
>> Link: https://lore.kernel.org/r/1587741394-22021-1-git-send-email-christian.gromm@microchip.com
>> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> Signed-off-by: Sasha Levin <sashal@kernel.org>
>> ---
>>  drivers/staging/most/core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
>> index 0c4ae6920d77d..409c48c597f2f 100644
>> --- a/drivers/staging/most/core.c
>> +++ b/drivers/staging/most/core.c
>> @@ -1484,7 +1484,7 @@ static void __exit most_exit(void)
>>  	ida_destroy(&mdev_id);
>>  }
>>
>> -module_init(most_init);
>> +subsys_initcall(most_init);
>>  module_exit(most_exit);
>>  MODULE_LICENSE("GPL");
>>  MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
>
>This is not needed in 5.6 and older kernels due to the most/core.c code
>being in staging for these releases.  It only became an issue when it
>moved out of staging.
>
>So please drop this from here and any older trees you might have
>selected it for.

Now dropped, thanks!

-- 
Thanks,
Sasha

Re: [PATCH AUTOSEL 5.6 16/62] most: core: use function subsys_initcall()

[Sasha Levin]

On Fri, May 15, 2020 at 08:59:14AM +0200, Greg Kroah-Hartman wrote:
>On Thu, May 14, 2020 at 02:51:01PM -0400, Sasha Levin wrote:
>> From: Christian Gromm <christian.gromm@microchip.com>
>>
>> [ Upstream commit 5e56bc06e18dfc8a66180fa369384b36e2ab621a ]
>>
>> This patch replaces function module_init() with subsys_initcall().
>> It is needed to ensure that the core module of the driver is
>> initialized before a component tries to register with the core. This
>> leads to a NULL pointer dereference if the driver is configured as
>> in-tree.
>>
>> Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
>> Reported-by: kernel test robot <lkp@intel.com>
>> Link: https://lore.kernel.org/r/1587741394-22021-1-git-send-email-christian.gromm@microchip.com
>> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> Signed-off-by: Sasha Levin <sashal@kernel.org>
>> ---
>>  drivers/staging/most/core.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
>> index 0c4ae6920d77d..409c48c597f2f 100644
>> --- a/drivers/staging/most/core.c
>> +++ b/drivers/staging/most/core.c
>> @@ -1484,7 +1484,7 @@ static void __exit most_exit(void)
>>  	ida_destroy(&mdev_id);
>>  }
>>
>> -module_init(most_init);
>> +subsys_initcall(most_init);
>>  module_exit(most_exit);
>>  MODULE_LICENSE("GPL");
>>  MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
>
>This is not needed in 5.6 and older kernels due to the most/core.c code
>being in staging for these releases.  It only became an issue when it
>moved out of staging.
>
>So please drop this from here and any older trees you might have
>selected it for.

Now dropped, thanks!

-- 
Thanks,
Sasha
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[PATCH AUTOSEL 5.6 17/62] component: Silence bind error on -EPROBE_DEFER

[Sasha Levin]

From: James Hilliard <james.hilliard1@gmail.com>

[ Upstream commit 7706b0a76a9697021e2bf395f3f065c18f51043d ]

If a component fails to bind due to -EPROBE_DEFER we should not log an
error as this is not a real failure.

Fixes messages like:
vc4-drm soc:gpu: failed to bind 3f902000.hdmi (ops vc4_hdmi_ops): -517
vc4-drm soc:gpu: master bind failed: -517

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Link: https://lore.kernel.org/r/20200411190241.89404-1-james.hilliard1@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/base/component.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/base/component.c b/drivers/base/component.c
index c7879f5ae2fbb..53b19daca750c 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -256,7 +256,8 @@ static int try_to_bring_up_master(struct master *master,
 	ret = master->ops->bind(master->dev);
 	if (ret < 0) {
 		devres_release_group(master->dev, NULL);
-		dev_info(master->dev, "master bind failed: %d\n", ret);
+		if (ret != -EPROBE_DEFER)
+			dev_info(master->dev, "master bind failed: %d\n", ret);
 		return ret;
 	}
 
@@ -610,8 +611,9 @@ static int component_bind(struct component *component, struct master *master,
 		devres_release_group(component->dev, NULL);
 		devres_release_group(master->dev, NULL);
 
-		dev_err(master->dev, "failed to bind %s (ops %ps): %d\n",
-			dev_name(component->dev), component->ops, ret);
+		if (ret != -EPROBE_DEFER)
+			dev_err(master->dev, "failed to bind %s (ops %ps): %d\n",
+				dev_name(component->dev), component->ops, ret);
 	}
 
 	return ret;
-- 
2.20.1

[PATCH AUTOSEL 5.6 18/62] net/ena: Fix build warning in ena_xdp_set()

[Sasha Levin]

From: Gavin Shan <gshan@redhat.com>

[ Upstream commit caec66198d137c26f0d234abc498866a58c64150 ]

This fixes the following build warning in ena_xdp_set(), which is
observed on aarch64 with 64KB page size.

   In file included from ./include/net/inet_sock.h:19,
      from ./include/net/ip.h:27,
      from drivers/net/ethernet/amazon/ena/ena_netdev.c:46:
   drivers/net/ethernet/amazon/ena/ena_netdev.c: In function         \
   ‘ena_xdp_set’:                                                    \
   drivers/net/ethernet/amazon/ena/ena_netdev.c:557:6: warning:      \
   format ‘%lu’                                                      \
   expects argument of type ‘long unsigned int’, but argument 4      \
   has type ‘int’                                                    \
   [-Wformat=] "Failed to set xdp program, the current MTU (%d) is   \
   larger than the maximum allowed MTU (%lu) while xdp is on",

Signed-off-by: Gavin Shan <gshan@redhat.com>
Acked-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h
index 8795e0b1dc3c0..8984aa2111125 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.h
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h
@@ -69,7 +69,7 @@
  * 16kB.
  */
 #if PAGE_SIZE > SZ_16K
-#define ENA_PAGE_SIZE SZ_16K
+#define ENA_PAGE_SIZE (_AC(SZ_16K, UL))
 #else
 #define ENA_PAGE_SIZE PAGE_SIZE
 #endif
-- 
2.20.1

[PATCH AUTOSEL 5.6 19/62] scsi: ibmvscsi: Fix WARN_ON during event pool release

[Sasha Levin]

From: Tyrel Datwyler <tyreld@linux.ibm.com>

[ Upstream commit b36522150e5b85045f868768d46fbaaa034174b2 ]

While removing an ibmvscsi client adapter a WARN_ON like the following is
seen in the kernel log:

drmgr: drmgr: -r -c slot -s U9080.M9S.783AEC8-V11-C11 -w 5 -d 1
WARNING: CPU: 9 PID: 24062 at ../kernel/dma/mapping.c:311 dma_free_attrs+0x78/0x110
Supported: No, Unreleased kernel
CPU: 9 PID: 24062 Comm: drmgr Kdump: loaded Tainted: G               X 5.3.18-12-default
NIP:  c0000000001fa758 LR: c0000000001fa744 CTR: c0000000001fa6e0
REGS: c0000002173375d0 TRAP: 0700   Tainted: G               X (5.3.18-12-default)
MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 28088282  XER: 20000000
CFAR: c0000000001fbf0c IRQMASK: 1
GPR00: c0000000001fa744 c000000217337860 c00000000161ab00 0000000000000000
GPR04: 0000000000000000 c000011e12250000 0000000018010000 0000000000000000
GPR08: 0000000000000000 0000000000000001 0000000000000001 c0080000190f4fa8
GPR12: c0000000001fa6e0 c000000007fc2a00 0000000000000000 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 000000011420e310 0000000000000000 0000000000000000 0000000018010000
GPR28: c00000000159de50 c000011e12250000 0000000000006600 c000011e5c994848
NIP [c0000000001fa758] dma_free_attrs+0x78/0x110
LR [c0000000001fa744] dma_free_attrs+0x64/0x110
Call Trace:
[c000000217337860] [000000011420e310] 0x11420e310 (unreliable)
[c0000002173378b0] [c0080000190f0280] release_event_pool+0xd8/0x120 [ibmvscsi]
[c000000217337930] [c0080000190f3f74] ibmvscsi_remove+0x6c/0x160 [ibmvscsi]
[c000000217337960] [c0000000000f3cac] vio_bus_remove+0x5c/0x100
[c0000002173379a0] [c00000000087a0a4] device_release_driver_internal+0x154/0x280
[c0000002173379e0] [c0000000008777cc] bus_remove_device+0x11c/0x220
[c000000217337a60] [c000000000870fc4] device_del+0x1c4/0x470
[c000000217337b10] [c0000000008712a0] device_unregister+0x30/0xa0
[c000000217337b80] [c0000000000f39ec] vio_unregister_device+0x2c/0x60
[c000000217337bb0] [c00800001a1d0964] dlpar_remove_slot+0x14c/0x250 [rpadlpar_io]
[c000000217337c50] [c00800001a1d0bcc] remove_slot_store+0xa4/0x110 [rpadlpar_io]
[c000000217337cd0] [c000000000c091a0] kobj_attr_store+0x30/0x50
[c000000217337cf0] [c00000000057c934] sysfs_kf_write+0x64/0x90
[c000000217337d10] [c00000000057be10] kernfs_fop_write+0x1b0/0x290
[c000000217337d60] [c000000000488c4c] __vfs_write+0x3c/0x70
[c000000217337d80] [c00000000048c648] vfs_write+0xd8/0x260
[c000000217337dd0] [c00000000048ca8c] ksys_write+0xdc/0x130
[c000000217337e20] [c00000000000b488] system_call+0x5c/0x70
Instruction dump:
7c840074 f8010010 f821ffb1 20840040 eb830218 7c8407b4 48002019 60000000
2fa30000 409e003c 892d0988 792907e0 <0b090000> 2fbd0000 419e0028 2fbc0000
---[ end trace 5955b3c0cc079942 ]---
rpadlpar_io: slot U9080.M9S.783AEC8-V11-C11 removed

This is tripped as a result of irqs being disabled during the call to
dma_free_coherent() by release_event_pool(). At this point in the code path
we have quiesced the adapter and it is overly paranoid to be holding the
host lock.

[mkp: fixed build warning reported by sfr]

Link: https://lore.kernel.org/r/1588027793-17952-1-git-send-email-tyreld@linux.ibm.com
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/ibmvscsi/ibmvscsi.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 7f66a77832099..59f0f1030c54a 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -2320,16 +2320,12 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 static int ibmvscsi_remove(struct vio_dev *vdev)
 {
 	struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
-	unsigned long flags;
 
 	srp_remove_host(hostdata->host);
 	scsi_remove_host(hostdata->host);
 
 	purge_requests(hostdata, DID_ERROR);
-
-	spin_lock_irqsave(hostdata->host->host_lock, flags);
 	release_event_pool(&hostdata->pool, hostdata);
-	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 
 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
 					max_events);
-- 
2.20.1

[PATCH AUTOSEL 5.6 19/62] scsi: ibmvscsi: Fix WARN_ON during event pool release

[Sasha Levin]

From: Tyrel Datwyler <tyreld@linux.ibm.com>

[ Upstream commit b36522150e5b85045f868768d46fbaaa034174b2 ]

While removing an ibmvscsi client adapter a WARN_ON like the following is
seen in the kernel log:

drmgr: drmgr: -r -c slot -s U9080.M9S.783AEC8-V11-C11 -w 5 -d 1
WARNING: CPU: 9 PID: 24062 at ../kernel/dma/mapping.c:311 dma_free_attrs+0x78/0x110
Supported: No, Unreleased kernel
CPU: 9 PID: 24062 Comm: drmgr Kdump: loaded Tainted: G               X 5.3.18-12-default
NIP:  c0000000001fa758 LR: c0000000001fa744 CTR: c0000000001fa6e0
REGS: c0000002173375d0 TRAP: 0700   Tainted: G               X (5.3.18-12-default)
MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 28088282  XER: 20000000
CFAR: c0000000001fbf0c IRQMASK: 1
GPR00: c0000000001fa744 c000000217337860 c00000000161ab00 0000000000000000
GPR04: 0000000000000000 c000011e12250000 0000000018010000 0000000000000000
GPR08: 0000000000000000 0000000000000001 0000000000000001 c0080000190f4fa8
GPR12: c0000000001fa6e0 c000000007fc2a00 0000000000000000 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 000000011420e310 0000000000000000 0000000000000000 0000000018010000
GPR28: c00000000159de50 c000011e12250000 0000000000006600 c000011e5c994848
NIP [c0000000001fa758] dma_free_attrs+0x78/0x110
LR [c0000000001fa744] dma_free_attrs+0x64/0x110
Call Trace:
[c000000217337860] [000000011420e310] 0x11420e310 (unreliable)
[c0000002173378b0] [c0080000190f0280] release_event_pool+0xd8/0x120 [ibmvscsi]
[c000000217337930] [c0080000190f3f74] ibmvscsi_remove+0x6c/0x160 [ibmvscsi]
[c000000217337960] [c0000000000f3cac] vio_bus_remove+0x5c/0x100
[c0000002173379a0] [c00000000087a0a4] device_release_driver_internal+0x154/0x280
[c0000002173379e0] [c0000000008777cc] bus_remove_device+0x11c/0x220
[c000000217337a60] [c000000000870fc4] device_del+0x1c4/0x470
[c000000217337b10] [c0000000008712a0] device_unregister+0x30/0xa0
[c000000217337b80] [c0000000000f39ec] vio_unregister_device+0x2c/0x60
[c000000217337bb0] [c00800001a1d0964] dlpar_remove_slot+0x14c/0x250 [rpadlpar_io]
[c000000217337c50] [c00800001a1d0bcc] remove_slot_store+0xa4/0x110 [rpadlpar_io]
[c000000217337cd0] [c000000000c091a0] kobj_attr_store+0x30/0x50
[c000000217337cf0] [c00000000057c934] sysfs_kf_write+0x64/0x90
[c000000217337d10] [c00000000057be10] kernfs_fop_write+0x1b0/0x290
[c000000217337d60] [c000000000488c4c] __vfs_write+0x3c/0x70
[c000000217337d80] [c00000000048c648] vfs_write+0xd8/0x260
[c000000217337dd0] [c00000000048ca8c] ksys_write+0xdc/0x130
[c000000217337e20] [c00000000000b488] system_call+0x5c/0x70
Instruction dump:
7c840074 f8010010 f821ffb1 20840040 eb830218 7c8407b4 48002019 60000000
2fa30000 409e003c 892d0988 792907e0 <0b090000> 2fbd0000 419e0028 2fbc0000
---[ end trace 5955b3c0cc079942 ]---
rpadlpar_io: slot U9080.M9S.783AEC8-V11-C11 removed

This is tripped as a result of irqs being disabled during the call to
dma_free_coherent() by release_event_pool(). At this point in the code path
we have quiesced the adapter and it is overly paranoid to be holding the
host lock.

[mkp: fixed build warning reported by sfr]

Link: https://lore.kernel.org/r/1588027793-17952-1-git-send-email-tyreld@linux.ibm.com
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/ibmvscsi/ibmvscsi.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 7f66a77832099..59f0f1030c54a 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -2320,16 +2320,12 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 static int ibmvscsi_remove(struct vio_dev *vdev)
 {
 	struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
-	unsigned long flags;
 
 	srp_remove_host(hostdata->host);
 	scsi_remove_host(hostdata->host);
 
 	purge_requests(hostdata, DID_ERROR);
-
-	spin_lock_irqsave(hostdata->host->host_lock, flags);
 	release_event_pool(&hostdata->pool, hostdata);
-	spin_unlock_irqrestore(hostdata->host->host_lock, flags);
 
 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
 					max_events);
-- 
2.20.1

[PATCH AUTOSEL 5.6 20/62] HID: i2c-hid: reset Synaptics SYNA2393 on resume

[Sasha Levin]

From: Daniel Playfair Cal <daniel.playfair.cal@gmail.com>

[ Upstream commit 538f67407e2c0e5ed2a46e7d7ffa52f2e30c7ef8 ]

On the Dell XPS 9570, the Synaptics SYNA2393 touchpad generates spurious
interrupts after resuming from suspend until it receives some input or
is reset. Add it to the quirk I2C_HID_QUIRK_RESET_ON_RESUME so that it
is reset when resuming from suspend.

More information about the bug can be found in this mailing list
discussion: https://www.spinics.net/lists/linux-input/msg59530.html

Signed-off-by: Daniel Playfair Cal <daniel.playfair.cal@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-ids.h              | 3 +++
 drivers/hid/i2c-hid/i2c-hid-core.c | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index b3cc26ca375fd..55afc089cb257 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -1094,6 +1094,9 @@
 #define USB_DEVICE_ID_SYMBOL_SCANNER_2	0x1300
 #define USB_DEVICE_ID_SYMBOL_SCANNER_3	0x1200
 
+#define I2C_VENDOR_ID_SYNAPTICS     0x06cb
+#define I2C_PRODUCT_ID_SYNAPTICS_SYNA2393   0x7a13
+
 #define USB_VENDOR_ID_SYNAPTICS		0x06cb
 #define USB_DEVICE_ID_SYNAPTICS_TP	0x0001
 #define USB_DEVICE_ID_SYNAPTICS_INT_TP	0x0002
diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 009000c5d55cd..294c84e136d72 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -177,6 +177,8 @@ static const struct i2c_hid_quirks {
 		 I2C_HID_QUIRK_BOGUS_IRQ },
 	{ USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
 		 I2C_HID_QUIRK_RESET_ON_RESUME },
+	{ I2C_VENDOR_ID_SYNAPTICS, I2C_PRODUCT_ID_SYNAPTICS_SYNA2393,
+		 I2C_HID_QUIRK_RESET_ON_RESUME },
 	{ USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
 		I2C_HID_QUIRK_BAD_INPUT_SIZE },
 	{ 0, 0 }
-- 
2.20.1

[PATCH AUTOSEL 5.6 21/62] ibmvnic: Skip fatal error reset after passive init

[Sasha Levin]

From: Juliet Kim <julietk@linux.vnet.ibm.com>

[ Upstream commit f9c6cea0b38518741c8dcf26ac056d26ee2fd61d ]

During MTU change, the following events may happen.
Client-driven CRQ initialization fails due to partner’s CRQ closed,
causing client to enqueue a reset task for FATAL_ERROR. Then passive
(server-driven) CRQ initialization succeeds, causing client to
release CRQ and enqueue a reset task for failover. If the passive
CRQ initialization occurs before the FATAL reset task is processed,
the FATAL error reset task would try to access a CRQ message queue
that was freed, causing an oops. The problem may be most likely to
occur during DLPAR add vNIC with a non-default MTU, because the DLPAR
process will automatically issue a change MTU request.

Fix this by not processing fatal error reset if CRQ is passively
initialized after client-driven CRQ initialization fails.

Signed-off-by: Juliet Kim <julietk@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 4bd33245bad62..3de549c6c6930 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2189,7 +2189,8 @@ static void __ibmvnic_reset(struct work_struct *work)
 				rc = do_hard_reset(adapter, rwi, reset_state);
 				rtnl_unlock();
 			}
-		} else {
+		} else if (!(rwi->reset_reason == VNIC_RESET_FATAL &&
+				adapter->from_passive_init)) {
 			rc = do_reset(adapter, rwi, reset_state);
 		}
 		kfree(rwi);
-- 
2.20.1

[PATCH AUTOSEL 5.6 21/62] ibmvnic: Skip fatal error reset after passive init

[Sasha Levin]

From: Juliet Kim <julietk@linux.vnet.ibm.com>

[ Upstream commit f9c6cea0b38518741c8dcf26ac056d26ee2fd61d ]

During MTU change, the following events may happen.
Client-driven CRQ initialization fails due to partner’s CRQ closed,
causing client to enqueue a reset task for FATAL_ERROR. Then passive
(server-driven) CRQ initialization succeeds, causing client to
release CRQ and enqueue a reset task for failover. If the passive
CRQ initialization occurs before the FATAL reset task is processed,
the FATAL error reset task would try to access a CRQ message queue
that was freed, causing an oops. The problem may be most likely to
occur during DLPAR add vNIC with a non-default MTU, because the DLPAR
process will automatically issue a change MTU request.

Fix this by not processing fatal error reset if CRQ is passively
initialized after client-driven CRQ initialization fails.

Signed-off-by: Juliet Kim <julietk@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 4bd33245bad62..3de549c6c6930 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2189,7 +2189,8 @@ static void __ibmvnic_reset(struct work_struct *work)
 				rc = do_hard_reset(adapter, rwi, reset_state);
 				rtnl_unlock();
 			}
-		} else {
+		} else if (!(rwi->reset_reason == VNIC_RESET_FATAL &&
+				adapter->from_passive_init)) {
 			rc = do_reset(adapter, rwi, reset_state);
 		}
 		kfree(rwi);
-- 
2.20.1

[PATCH AUTOSEL 5.6 22/62] soc: qcom: ipa: IPA endpoints

[Sasha Levin]

From: Alex Elder <elder@linaro.org>

[ Upstream commit 84f9bd12d46dbe8ac7d4b650a8fbb4c49657a38b ]

This patch includes the code implementing an IPA endpoint.  This is
the primary abstraction implemented by the IPA.  An endpoint is one
end of a network connection between two entities physically
connected to the IPA.  Specifically, the AP and the modem implement
endpoints, and an (AP endpoint, modem endpoint) pair implements the
transfer of network data in one direction between the AP and modem.

Endpoints are built on top of GSI channels, but IPA endpoints
represent the higher-level functionality that the IPA provides.
Data can be sent through a GSI channel, but it is the IPA endpoint
that represents what is on the "other end" to receive that data.
Other functionality, including aggregation, checksum offload and
(at some future date) IP routing and filtering are all associated
with the IPA endpoint.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ipa/ipa_endpoint.c | 1707 ++++++++++++++++++++++++++++++++
 drivers/net/ipa/ipa_endpoint.h |  110 ++
 2 files changed, 1817 insertions(+)
 create mode 100644 drivers/net/ipa/ipa_endpoint.c
 create mode 100644 drivers/net/ipa/ipa_endpoint.h

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
new file mode 100644
index 0000000000000..915b4cd05dd29
--- /dev/null
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -0,0 +1,1707 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2019-2020 Linaro Ltd.
+ */
+
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/bitfield.h>
+#include <linux/if_rmnet.h>
+#include <linux/version.h>
+#include <linux/dma-direction.h>
+
+#include "gsi.h"
+#include "gsi_trans.h"
+#include "ipa.h"
+#include "ipa_data.h"
+#include "ipa_endpoint.h"
+#include "ipa_cmd.h"
+#include "ipa_mem.h"
+#include "ipa_modem.h"
+#include "ipa_table.h"
+#include "ipa_gsi.h"
+
+#define atomic_dec_not_zero(v)	atomic_add_unless((v), -1, 0)
+
+#define IPA_REPLENISH_BATCH	16
+
+#define IPA_RX_BUFFER_SIZE	(PAGE_SIZE << IPA_RX_BUFFER_ORDER)
+#define IPA_RX_BUFFER_ORDER	1	/* 8KB endpoint RX buffers (2 pages) */
+
+/* The amount of RX buffer space consumed by standard skb overhead */
+#define IPA_RX_BUFFER_OVERHEAD	(PAGE_SIZE - SKB_MAX_ORDER(NET_SKB_PAD, 0))
+
+#define IPA_ENDPOINT_STOP_RX_RETRIES		10
+#define IPA_ENDPOINT_STOP_RX_SIZE		1	/* bytes */
+
+#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX	3
+#define IPA_AGGR_TIME_LIMIT_DEFAULT		1000	/* microseconds */
+
+#define ENDPOINT_STOP_DMA_TIMEOUT		15	/* milliseconds */
+
+/** enum ipa_status_opcode - status element opcode hardware values */
+enum ipa_status_opcode {
+	IPA_STATUS_OPCODE_PACKET		= 0x01,
+	IPA_STATUS_OPCODE_NEW_FRAG_RULE		= 0x02,
+	IPA_STATUS_OPCODE_DROPPED_PACKET	= 0x04,
+	IPA_STATUS_OPCODE_SUSPENDED_PACKET	= 0x08,
+	IPA_STATUS_OPCODE_LOG			= 0x10,
+	IPA_STATUS_OPCODE_DCMP			= 0x20,
+	IPA_STATUS_OPCODE_PACKET_2ND_PASS	= 0x40,
+};
+
+/** enum ipa_status_exception - status element exception type */
+enum ipa_status_exception {
+	/* 0 means no exception */
+	IPA_STATUS_EXCEPTION_DEAGGR		= 0x01,
+	IPA_STATUS_EXCEPTION_IPTYPE		= 0x04,
+	IPA_STATUS_EXCEPTION_PACKET_LENGTH	= 0x08,
+	IPA_STATUS_EXCEPTION_FRAG_RULE_MISS	= 0x10,
+	IPA_STATUS_EXCEPTION_SW_FILT		= 0x20,
+	/* The meaning of the next value depends on whether the IP version */
+	IPA_STATUS_EXCEPTION_NAT		= 0x40,		/* IPv4 */
+	IPA_STATUS_EXCEPTION_IPV6CT		= IPA_STATUS_EXCEPTION_NAT,
+};
+
+/* Status element provided by hardware */
+struct ipa_status {
+	u8 opcode;		/* enum ipa_status_opcode */
+	u8 exception;		/* enum ipa_status_exception */
+	__le16 mask;
+	__le16 pkt_len;
+	u8 endp_src_idx;
+	u8 endp_dst_idx;
+	__le32 metadata;
+	__le32 flags1;
+	__le64 flags2;
+	__le32 flags3;
+	__le32 flags4;
+};
+
+/* Field masks for struct ipa_status structure fields */
+
+#define IPA_STATUS_SRC_IDX_FMASK		GENMASK(4, 0)
+
+#define IPA_STATUS_DST_IDX_FMASK		GENMASK(4, 0)
+
+#define IPA_STATUS_FLAGS1_FLT_LOCAL_FMASK	GENMASK(0, 0)
+#define IPA_STATUS_FLAGS1_FLT_HASH_FMASK	GENMASK(1, 1)
+#define IPA_STATUS_FLAGS1_FLT_GLOBAL_FMASK	GENMASK(2, 2)
+#define IPA_STATUS_FLAGS1_FLT_RET_HDR_FMASK	GENMASK(3, 3)
+#define IPA_STATUS_FLAGS1_FLT_RULE_ID_FMASK	GENMASK(13, 4)
+#define IPA_STATUS_FLAGS1_RT_LOCAL_FMASK	GENMASK(14, 14)
+#define IPA_STATUS_FLAGS1_RT_HASH_FMASK		GENMASK(15, 15)
+#define IPA_STATUS_FLAGS1_UCP_FMASK		GENMASK(16, 16)
+#define IPA_STATUS_FLAGS1_RT_TBL_IDX_FMASK	GENMASK(21, 17)
+#define IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK	GENMASK(31, 22)
+
+#define IPA_STATUS_FLAGS2_NAT_HIT_FMASK		GENMASK_ULL(0, 0)
+#define IPA_STATUS_FLAGS2_NAT_ENTRY_IDX_FMASK	GENMASK_ULL(13, 1)
+#define IPA_STATUS_FLAGS2_NAT_TYPE_FMASK	GENMASK_ULL(15, 14)
+#define IPA_STATUS_FLAGS2_TAG_INFO_FMASK	GENMASK_ULL(63, 16)
+
+#define IPA_STATUS_FLAGS3_SEQ_NUM_FMASK		GENMASK(7, 0)
+#define IPA_STATUS_FLAGS3_TOD_CTR_FMASK		GENMASK(31, 8)
+
+#define IPA_STATUS_FLAGS4_HDR_LOCAL_FMASK	GENMASK(0, 0)
+#define IPA_STATUS_FLAGS4_HDR_OFFSET_FMASK	GENMASK(10, 1)
+#define IPA_STATUS_FLAGS4_FRAG_HIT_FMASK	GENMASK(11, 11)
+#define IPA_STATUS_FLAGS4_FRAG_RULE_FMASK	GENMASK(15, 12)
+#define IPA_STATUS_FLAGS4_HW_SPECIFIC_FMASK	GENMASK(31, 16)
+
+#ifdef IPA_VALIDATE
+
+static void ipa_endpoint_validate_build(void)
+{
+	/* The aggregation byte limit defines the point at which an
+	 * aggregation window will close.  It is programmed into the
+	 * IPA hardware as a number of KB.  We don't use "hard byte
+	 * limit" aggregation, which means that we need to supply
+	 * enough space in a receive buffer to hold a complete MTU
+	 * plus normal skb overhead *after* that aggregation byte
+	 * limit has been crossed.
+	 *
+	 * This check just ensures we don't define a receive buffer
+	 * size that would exceed what we can represent in the field
+	 * that is used to program its size.
+	 */
+	BUILD_BUG_ON(IPA_RX_BUFFER_SIZE >
+		     field_max(AGGR_BYTE_LIMIT_FMASK) * SZ_1K +
+		     IPA_MTU + IPA_RX_BUFFER_OVERHEAD);
+
+	/* I honestly don't know where this requirement comes from.  But
+	 * it holds, and if we someday need to loosen the constraint we
+	 * can try to track it down.
+	 */
+	BUILD_BUG_ON(sizeof(struct ipa_status) % 4);
+}
+
+static bool ipa_endpoint_data_valid_one(struct ipa *ipa, u32 count,
+			    const struct ipa_gsi_endpoint_data *all_data,
+			    const struct ipa_gsi_endpoint_data *data)
+{
+	const struct ipa_gsi_endpoint_data *other_data;
+	struct device *dev = &ipa->pdev->dev;
+	enum ipa_endpoint_name other_name;
+
+	if (ipa_gsi_endpoint_data_empty(data))
+		return true;
+
+	if (!data->toward_ipa) {
+		if (data->endpoint.filter_support) {
+			dev_err(dev, "filtering not supported for "
+					"RX endpoint %u\n",
+				data->endpoint_id);
+			return false;
+		}
+
+		return true;	/* Nothing more to check for RX */
+	}
+
+	if (data->endpoint.config.status_enable) {
+		other_name = data->endpoint.config.tx.status_endpoint;
+		if (other_name >= count) {
+			dev_err(dev, "status endpoint name %u out of range "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+
+		/* Status endpoint must be defined... */
+		other_data = &all_data[other_name];
+		if (ipa_gsi_endpoint_data_empty(other_data)) {
+			dev_err(dev, "DMA endpoint name %u undefined "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+
+		/* ...and has to be an RX endpoint... */
+		if (other_data->toward_ipa) {
+			dev_err(dev,
+				"status endpoint for endpoint %u not RX\n",
+				data->endpoint_id);
+			return false;
+		}
+
+		/* ...and if it's to be an AP endpoint... */
+		if (other_data->ee_id == GSI_EE_AP) {
+			/* ...make sure it has status enabled. */
+			if (!other_data->endpoint.config.status_enable) {
+				dev_err(dev,
+					"status not enabled for endpoint %u\n",
+					other_data->endpoint_id);
+				return false;
+			}
+		}
+	}
+
+	if (data->endpoint.config.dma_mode) {
+		other_name = data->endpoint.config.dma_endpoint;
+		if (other_name >= count) {
+			dev_err(dev, "DMA endpoint name %u out of range "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+
+		other_data = &all_data[other_name];
+		if (ipa_gsi_endpoint_data_empty(other_data)) {
+			dev_err(dev, "DMA endpoint name %u undefined "
+					"for endpoint %u\n",
+				other_name, data->endpoint_id);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static bool ipa_endpoint_data_valid(struct ipa *ipa, u32 count,
+				    const struct ipa_gsi_endpoint_data *data)
+{
+	const struct ipa_gsi_endpoint_data *dp = data;
+	struct device *dev = &ipa->pdev->dev;
+	enum ipa_endpoint_name name;
+
+	ipa_endpoint_validate_build();
+
+	if (count > IPA_ENDPOINT_COUNT) {
+		dev_err(dev, "too many endpoints specified (%u > %u)\n",
+			count, IPA_ENDPOINT_COUNT);
+		return false;
+	}
+
+	/* Make sure needed endpoints have defined data */
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_COMMAND_TX])) {
+		dev_err(dev, "command TX endpoint not defined\n");
+		return false;
+	}
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_LAN_RX])) {
+		dev_err(dev, "LAN RX endpoint not defined\n");
+		return false;
+	}
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_MODEM_TX])) {
+		dev_err(dev, "AP->modem TX endpoint not defined\n");
+		return false;
+	}
+	if (ipa_gsi_endpoint_data_empty(&data[IPA_ENDPOINT_AP_MODEM_RX])) {
+		dev_err(dev, "AP<-modem RX endpoint not defined\n");
+		return false;
+	}
+
+	for (name = 0; name < count; name++, dp++)
+		if (!ipa_endpoint_data_valid_one(ipa, count, data, dp))
+			return false;
+
+	return true;
+}
+
+#else /* !IPA_VALIDATE */
+
+static bool ipa_endpoint_data_valid(struct ipa *ipa, u32 count,
+				    const struct ipa_gsi_endpoint_data *data)
+{
+	return true;
+}
+
+#endif /* !IPA_VALIDATE */
+
+/* Allocate a transaction to use on a non-command endpoint */
+static struct gsi_trans *ipa_endpoint_trans_alloc(struct ipa_endpoint *endpoint,
+						  u32 tre_count)
+{
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	u32 channel_id = endpoint->channel_id;
+	enum dma_data_direction direction;
+
+	direction = endpoint->toward_ipa ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+	return gsi_channel_trans_alloc(gsi, channel_id, tre_count, direction);
+}
+
+/* suspend_delay represents suspend for RX, delay for TX endpoints.
+ * Note that suspend is not supported starting with IPA v4.0.
+ */
+static int
+ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
+{
+	u32 offset = IPA_REG_ENDP_INIT_CTRL_N_OFFSET(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	u32 mask;
+	u32 val;
+
+	/* assert(ipa->version == IPA_VERSION_3_5_1 */
+	mask = endpoint->toward_ipa ? ENDP_DELAY_FMASK : ENDP_SUSPEND_FMASK;
+
+	val = ioread32(ipa->reg_virt + offset);
+	if (suspend_delay == !!(val & mask))
+		return -EALREADY;	/* Already set to desired state */
+
+	val ^= mask;
+	iowrite32(val, ipa->reg_virt + offset);
+
+	return 0;
+}
+
+/* Enable or disable delay or suspend mode on all modem endpoints */
+void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
+{
+	bool support_suspend;
+	u32 endpoint_id;
+
+	/* DELAY mode doesn't work right on IPA v4.2 */
+	if (ipa->version == IPA_VERSION_4_2)
+		return;
+
+	/* Only IPA v3.5.1 supports SUSPEND mode on RX endpoints */
+	support_suspend = ipa->version == IPA_VERSION_3_5_1;
+
+	for (endpoint_id = 0; endpoint_id < IPA_ENDPOINT_MAX; endpoint_id++) {
+		struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id];
+
+		if (endpoint->ee_id != GSI_EE_MODEM)
+			continue;
+
+		/* Set TX delay mode, or for IPA v3.5.1 RX suspend mode */
+		if (endpoint->toward_ipa || support_suspend)
+			(void)ipa_endpoint_init_ctrl(endpoint, enable);
+	}
+}
+
+/* Reset all modem endpoints to use the default exception endpoint */
+int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa)
+{
+	u32 initialized = ipa->initialized;
+	struct gsi_trans *trans;
+	u32 count;
+
+	/* We need one command per modem TX endpoint.  We can get an upper
+	 * bound on that by assuming all initialized endpoints are modem->IPA.
+	 * That won't happen, and we could be more precise, but this is fine
+	 * for now.  We need to end the transactio with a "tag process."
+	 */
+	count = hweight32(initialized) + ipa_cmd_tag_process_count();
+	trans = ipa_cmd_trans_alloc(ipa, count);
+	if (!trans) {
+		dev_err(&ipa->pdev->dev,
+			"no transaction to reset modem exception endpoints\n");
+		return -EBUSY;
+	}
+
+	while (initialized) {
+		u32 endpoint_id = __ffs(initialized);
+		struct ipa_endpoint *endpoint;
+		u32 offset;
+
+		initialized ^= BIT(endpoint_id);
+
+		/* We only reset modem TX endpoints */
+		endpoint = &ipa->endpoint[endpoint_id];
+		if (!(endpoint->ee_id == GSI_EE_MODEM && endpoint->toward_ipa))
+			continue;
+
+		offset = IPA_REG_ENDP_STATUS_N_OFFSET(endpoint_id);
+
+		/* Value written is 0, and all bits are updated.  That
+		 * means status is disabled on the endpoint, and as a
+		 * result all other fields in the register are ignored.
+		 */
+		ipa_cmd_register_write_add(trans, offset, 0, ~0, false);
+	}
+
+	ipa_cmd_tag_process_add(trans);
+
+	/* XXX This should have a 1 second timeout */
+	gsi_trans_commit_wait(trans);
+
+	return 0;
+}
+
+static void ipa_endpoint_init_cfg(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_CFG_N_OFFSET(endpoint->endpoint_id);
+	u32 val = 0;
+
+	/* FRAG_OFFLOAD_EN is 0 */
+	if (endpoint->data->checksum) {
+		if (endpoint->toward_ipa) {
+			u32 checksum_offset;
+
+			val |= u32_encode_bits(IPA_CS_OFFLOAD_UL,
+					       CS_OFFLOAD_EN_FMASK);
+			/* Checksum header offset is in 4-byte units */
+			checksum_offset = sizeof(struct rmnet_map_header);
+			checksum_offset /= sizeof(u32);
+			val |= u32_encode_bits(checksum_offset,
+					       CS_METADATA_HDR_OFFSET_FMASK);
+		} else {
+			val |= u32_encode_bits(IPA_CS_OFFLOAD_DL,
+					       CS_OFFLOAD_EN_FMASK);
+		}
+	} else {
+		val |= u32_encode_bits(IPA_CS_OFFLOAD_NONE,
+				       CS_OFFLOAD_EN_FMASK);
+	}
+	/* CS_GEN_QMB_MASTER_SEL is 0 */
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_hdr(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_HDR_N_OFFSET(endpoint->endpoint_id);
+	u32 val = 0;
+
+	if (endpoint->data->qmap) {
+		size_t header_size = sizeof(struct rmnet_map_header);
+
+		if (endpoint->toward_ipa && endpoint->data->checksum)
+			header_size += sizeof(struct rmnet_map_ul_csum_header);
+
+		val |= u32_encode_bits(header_size, HDR_LEN_FMASK);
+		/* metadata is the 4 byte rmnet_map header itself */
+		val |= HDR_OFST_METADATA_VALID_FMASK;
+		val |= u32_encode_bits(0, HDR_OFST_METADATA_FMASK);
+		/* HDR_ADDITIONAL_CONST_LEN is 0; (IPA->AP only) */
+		if (!endpoint->toward_ipa) {
+			u32 size_offset = offsetof(struct rmnet_map_header,
+						   pkt_len);
+
+			val |= HDR_OFST_PKT_SIZE_VALID_FMASK;
+			val |= u32_encode_bits(size_offset,
+					       HDR_OFST_PKT_SIZE_FMASK);
+		}
+		/* HDR_A5_MUX is 0 */
+		/* HDR_LEN_INC_DEAGG_HDR is 0 */
+		/* HDR_METADATA_REG_VALID is 0; (AP->IPA only) */
+	}
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_hdr_ext(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_HDR_EXT_N_OFFSET(endpoint->endpoint_id);
+	u32 pad_align = endpoint->data->rx.pad_align;
+	u32 val = 0;
+
+	val |= HDR_ENDIANNESS_FMASK;		/* big endian */
+	val |= HDR_TOTAL_LEN_OR_PAD_VALID_FMASK;
+	/* HDR_TOTAL_LEN_OR_PAD is 0 (pad, not total_len) */
+	/* HDR_PAYLOAD_LEN_INC_PADDING is 0 */
+	/* HDR_TOTAL_LEN_OR_PAD_OFFSET is 0 */
+	if (!endpoint->toward_ipa)
+		val |= u32_encode_bits(pad_align, HDR_PAD_TO_ALIGNMENT_FMASK);
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/**
+ * Generate a metadata mask value that will select only the mux_id
+ * field in an rmnet_map header structure.  The mux_id is at offset
+ * 1 byte from the beginning of the structure, but the metadata
+ * value is treated as a 4-byte unit.  So this mask must be computed
+ * with endianness in mind.  Note that ipa_endpoint_init_hdr_metadata_mask()
+ * will convert this value to the proper byte order.
+ *
+ * Marked __always_inline because this is really computing a
+ * constant value.
+ */
+static __always_inline __be32 ipa_rmnet_mux_id_metadata_mask(void)
+{
+	size_t mux_id_offset = offsetof(struct rmnet_map_header, mux_id);
+	u32 mux_id_mask = 0;
+	u8 *bytes;
+
+	bytes = (u8 *)&mux_id_mask;
+	bytes[mux_id_offset] = 0xff;	/* mux_id is 1 byte */
+
+	return cpu_to_be32(mux_id_mask);
+}
+
+static void ipa_endpoint_init_hdr_metadata_mask(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	u32 val = 0;
+	u32 offset;
+
+	offset = IPA_REG_ENDP_INIT_HDR_METADATA_MASK_N_OFFSET(endpoint_id);
+
+	if (!endpoint->toward_ipa && endpoint->data->qmap)
+		val = ipa_rmnet_mux_id_metadata_mask();
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_mode(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_MODE_N_OFFSET(endpoint->endpoint_id);
+	u32 val;
+
+	if (endpoint->toward_ipa && endpoint->data->dma_mode) {
+		enum ipa_endpoint_name name = endpoint->data->dma_endpoint;
+		u32 dma_endpoint_id;
+
+		dma_endpoint_id = endpoint->ipa->name_map[name]->endpoint_id;
+
+		val = u32_encode_bits(IPA_DMA, MODE_FMASK);
+		val |= u32_encode_bits(dma_endpoint_id, DEST_PIPE_INDEX_FMASK);
+	} else {
+		val = u32_encode_bits(IPA_BASIC, MODE_FMASK);
+	}
+	/* Other bitfields unspecified (and 0) */
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/* Compute the aggregation size value to use for a given buffer size */
+static u32 ipa_aggr_size_kb(u32 rx_buffer_size)
+{
+	/* We don't use "hard byte limit" aggregation, so we define the
+	 * aggregation limit such that our buffer has enough space *after*
+	 * that limit to receive a full MTU of data, plus overhead.
+	 */
+	rx_buffer_size -= IPA_MTU + IPA_RX_BUFFER_OVERHEAD;
+
+	return rx_buffer_size / SZ_1K;
+}
+
+static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_AGGR_N_OFFSET(endpoint->endpoint_id);
+	u32 val = 0;
+
+	if (endpoint->data->aggregation) {
+		if (!endpoint->toward_ipa) {
+			u32 aggr_size = ipa_aggr_size_kb(IPA_RX_BUFFER_SIZE);
+			u32 limit;
+
+			val |= u32_encode_bits(IPA_ENABLE_AGGR, AGGR_EN_FMASK);
+			val |= u32_encode_bits(IPA_GENERIC, AGGR_TYPE_FMASK);
+			val |= u32_encode_bits(aggr_size,
+					       AGGR_BYTE_LIMIT_FMASK);
+			limit = IPA_AGGR_TIME_LIMIT_DEFAULT;
+			val |= u32_encode_bits(limit / IPA_AGGR_GRANULARITY,
+					       AGGR_TIME_LIMIT_FMASK);
+			val |= u32_encode_bits(0, AGGR_PKT_LIMIT_FMASK);
+			if (endpoint->data->rx.aggr_close_eof)
+				val |= AGGR_SW_EOF_ACTIVE_FMASK;
+			/* AGGR_HARD_BYTE_LIMIT_ENABLE is 0 */
+		} else {
+			val |= u32_encode_bits(IPA_ENABLE_DEAGGR,
+					       AGGR_EN_FMASK);
+			val |= u32_encode_bits(IPA_QCMAP, AGGR_TYPE_FMASK);
+			/* other fields ignored */
+		}
+		/* AGGR_FORCE_CLOSE is 0 */
+	} else {
+		val |= u32_encode_bits(IPA_BYPASS_AGGR, AGGR_EN_FMASK);
+		/* other fields ignored */
+	}
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/* A return value of 0 indicates an error */
+static u32 ipa_reg_init_hol_block_timer_val(struct ipa *ipa, u32 microseconds)
+{
+	u32 scale;
+	u32 base;
+	u32 val;
+
+	if (!microseconds)
+		return 0;	/* invalid delay */
+
+	/* Timer is represented in units of clock ticks. */
+	if (ipa->version < IPA_VERSION_4_2)
+		return microseconds;	/* XXX Needs to be computed */
+
+	/* IPA v4.2 represents the tick count as base * scale */
+	scale = 1;			/* XXX Needs to be computed */
+	if (scale > field_max(SCALE_FMASK))
+		return 0;		/* scale too big */
+
+	base = DIV_ROUND_CLOSEST(microseconds, scale);
+	if (base > field_max(BASE_VALUE_FMASK))
+		return 0;		/* microseconds too big */
+
+	val = u32_encode_bits(scale, SCALE_FMASK);
+	val |= u32_encode_bits(base, BASE_VALUE_FMASK);
+
+	return val;
+}
+
+static int ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
+					     u32 microseconds)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	u32 offset;
+	u32 val;
+
+	/* XXX We'll fix this when the register definition is clear */
+	if (microseconds) {
+		struct device *dev = &ipa->pdev->dev;
+
+		dev_err(dev, "endpoint %u non-zero HOLB period (ignoring)\n",
+			endpoint_id);
+		microseconds = 0;
+	}
+
+	if (microseconds) {
+		val = ipa_reg_init_hol_block_timer_val(ipa, microseconds);
+		if (!val)
+			return -EINVAL;
+	} else {
+		val = 0;	/* timeout is immediate */
+	}
+	offset = IPA_REG_ENDP_INIT_HOL_BLOCK_TIMER_N_OFFSET(endpoint_id);
+	iowrite32(val, ipa->reg_virt + offset);
+
+	return 0;
+}
+
+static void
+ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	u32 offset;
+	u32 val;
+
+	val = u32_encode_bits(enable ? 1 : 0, HOL_BLOCK_EN_FMASK);
+	offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
+{
+	u32 i;
+
+	for (i = 0; i < IPA_ENDPOINT_MAX; i++) {
+		struct ipa_endpoint *endpoint = &ipa->endpoint[i];
+
+		if (endpoint->ee_id != GSI_EE_MODEM)
+			continue;
+
+		(void)ipa_endpoint_init_hol_block_timer(endpoint, 0);
+		ipa_endpoint_init_hol_block_enable(endpoint, true);
+	}
+}
+
+static void ipa_endpoint_init_deaggr(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_DEAGGR_N_OFFSET(endpoint->endpoint_id);
+	u32 val = 0;
+
+	/* DEAGGR_HDR_LEN is 0 */
+	/* PACKET_OFFSET_VALID is 0 */
+	/* PACKET_OFFSET_LOCATION is ignored (not valid) */
+	/* MAX_PACKET_LEN is 0 (not enforced) */
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+static void ipa_endpoint_init_seq(struct ipa_endpoint *endpoint)
+{
+	u32 offset = IPA_REG_ENDP_INIT_SEQ_N_OFFSET(endpoint->endpoint_id);
+	u32 seq_type = endpoint->seq_type;
+	u32 val = 0;
+
+	val |= u32_encode_bits(seq_type & 0xf, HPS_SEQ_TYPE_FMASK);
+	val |= u32_encode_bits((seq_type >> 4) & 0xf, DPS_SEQ_TYPE_FMASK);
+	/* HPS_REP_SEQ_TYPE is 0 */
+	/* DPS_REP_SEQ_TYPE is 0 */
+
+	iowrite32(val, endpoint->ipa->reg_virt + offset);
+}
+
+/**
+ * ipa_endpoint_skb_tx() - Transmit a socket buffer
+ * @endpoint:	Endpoint pointer
+ * @skb:	Socket buffer to send
+ *
+ * Returns:	0 if successful, or a negative error code
+ */
+int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb)
+{
+	struct gsi_trans *trans;
+	u32 nr_frags;
+	int ret;
+
+	/* Make sure source endpoint's TLV FIFO has enough entries to
+	 * hold the linear portion of the skb and all its fragments.
+	 * If not, see if we can linearize it before giving up.
+	 */
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	if (1 + nr_frags > endpoint->trans_tre_max) {
+		if (skb_linearize(skb))
+			return -E2BIG;
+		nr_frags = 0;
+	}
+
+	trans = ipa_endpoint_trans_alloc(endpoint, 1 + nr_frags);
+	if (!trans)
+		return -EBUSY;
+
+	ret = gsi_trans_skb_add(trans, skb);
+	if (ret)
+		goto err_trans_free;
+	trans->data = skb;	/* transaction owns skb now */
+
+	gsi_trans_commit(trans, !netdev_xmit_more());
+
+	return 0;
+
+err_trans_free:
+	gsi_trans_free(trans);
+
+	return -ENOMEM;
+}
+
+static void ipa_endpoint_status(struct ipa_endpoint *endpoint)
+{
+	u32 endpoint_id = endpoint->endpoint_id;
+	struct ipa *ipa = endpoint->ipa;
+	u32 val = 0;
+	u32 offset;
+
+	offset = IPA_REG_ENDP_STATUS_N_OFFSET(endpoint_id);
+
+	if (endpoint->data->status_enable) {
+		val |= STATUS_EN_FMASK;
+		if (endpoint->toward_ipa) {
+			enum ipa_endpoint_name name;
+			u32 status_endpoint_id;
+
+			name = endpoint->data->tx.status_endpoint;
+			status_endpoint_id = ipa->name_map[name]->endpoint_id;
+
+			val |= u32_encode_bits(status_endpoint_id,
+					       STATUS_ENDP_FMASK);
+		}
+		/* STATUS_LOCATION is 0 (status element precedes packet) */
+		/* The next field is present for IPA v4.0 and above */
+		/* STATUS_PKT_SUPPRESS_FMASK is 0 */
+	}
+
+	iowrite32(val, ipa->reg_virt + offset);
+}
+
+static int ipa_endpoint_replenish_one(struct ipa_endpoint *endpoint)
+{
+	struct gsi_trans *trans;
+	bool doorbell = false;
+	struct page *page;
+	u32 offset;
+	u32 len;
+	int ret;
+
+	page = dev_alloc_pages(IPA_RX_BUFFER_ORDER);
+	if (!page)
+		return -ENOMEM;
+
+	trans = ipa_endpoint_trans_alloc(endpoint, 1);
+	if (!trans)
+		goto err_free_pages;
+
+	/* Offset the buffer to make space for skb headroom */
+	offset = NET_SKB_PAD;
+	len = IPA_RX_BUFFER_SIZE - offset;
+
+	ret = gsi_trans_page_add(trans, page, len, offset);
+	if (ret)
+		goto err_trans_free;
+	trans->data = page;	/* transaction owns page now */
+
+	if (++endpoint->replenish_ready == IPA_REPLENISH_BATCH) {
+		doorbell = true;
+		endpoint->replenish_ready = 0;
+	}
+
+	gsi_trans_commit(trans, doorbell);
+
+	return 0;
+
+err_trans_free:
+	gsi_trans_free(trans);
+err_free_pages:
+	__free_pages(page, IPA_RX_BUFFER_ORDER);
+
+	return -ENOMEM;
+}
+
+/**
+ * ipa_endpoint_replenish() - Replenish the Rx packets cache.
+ *
+ * Allocate RX packet wrapper structures with maximal socket buffers
+ * for an endpoint.  These are supplied to the hardware, which fills
+ * them with incoming data.
+ */
+static void ipa_endpoint_replenish(struct ipa_endpoint *endpoint, u32 count)
+{
+	struct gsi *gsi;
+	u32 backlog;
+
+	if (!endpoint->replenish_enabled) {
+		if (count)
+			atomic_add(count, &endpoint->replenish_saved);
+		return;
+	}
+
+
+	while (atomic_dec_not_zero(&endpoint->replenish_backlog))
+		if (ipa_endpoint_replenish_one(endpoint))
+			goto try_again_later;
+	if (count)
+		atomic_add(count, &endpoint->replenish_backlog);
+
+	return;
+
+try_again_later:
+	/* The last one didn't succeed, so fix the backlog */
+	backlog = atomic_inc_return(&endpoint->replenish_backlog);
+
+	if (count)
+		atomic_add(count, &endpoint->replenish_backlog);
+
+	/* Whenever a receive buffer transaction completes we'll try to
+	 * replenish again.  It's unlikely, but if we fail to supply even
+	 * one buffer, nothing will trigger another replenish attempt.
+	 * Receive buffer transactions use one TRE, so schedule work to
+	 * try replenishing again if our backlog is *all* available TREs.
+	 */
+	gsi = &endpoint->ipa->gsi;
+	if (backlog == gsi_channel_tre_max(gsi, endpoint->channel_id))
+		schedule_delayed_work(&endpoint->replenish_work,
+				      msecs_to_jiffies(1));
+}
+
+static void ipa_endpoint_replenish_enable(struct ipa_endpoint *endpoint)
+{
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	u32 max_backlog;
+	u32 saved;
+
+	endpoint->replenish_enabled = true;
+	while ((saved = atomic_xchg(&endpoint->replenish_saved, 0)))
+		atomic_add(saved, &endpoint->replenish_backlog);
+
+	/* Start replenishing if hardware currently has no buffers */
+	max_backlog = gsi_channel_tre_max(gsi, endpoint->channel_id);
+	if (atomic_read(&endpoint->replenish_backlog) == max_backlog)
+		ipa_endpoint_replenish(endpoint, 0);
+}
+
+static void ipa_endpoint_replenish_disable(struct ipa_endpoint *endpoint)
+{
+	u32 backlog;
+
+	endpoint->replenish_enabled = false;
+	while ((backlog = atomic_xchg(&endpoint->replenish_backlog, 0)))
+		atomic_add(backlog, &endpoint->replenish_saved);
+}
+
+static void ipa_endpoint_replenish_work(struct work_struct *work)
+{
+	struct delayed_work *dwork = to_delayed_work(work);
+	struct ipa_endpoint *endpoint;
+
+	endpoint = container_of(dwork, struct ipa_endpoint, replenish_work);
+
+	ipa_endpoint_replenish(endpoint, 0);
+}
+
+static void ipa_endpoint_skb_copy(struct ipa_endpoint *endpoint,
+				  void *data, u32 len, u32 extra)
+{
+	struct sk_buff *skb;
+
+	skb = __dev_alloc_skb(len, GFP_ATOMIC);
+	if (skb) {
+		skb_put(skb, len);
+		memcpy(skb->data, data, len);
+		skb->truesize += extra;
+	}
+
+	/* Now receive it, or drop it if there's no netdev */
+	if (endpoint->netdev)
+		ipa_modem_skb_rx(endpoint->netdev, skb);
+	else if (skb)
+		dev_kfree_skb_any(skb);
+}
+
+static bool ipa_endpoint_skb_build(struct ipa_endpoint *endpoint,
+				   struct page *page, u32 len)
+{
+	struct sk_buff *skb;
+
+	/* Nothing to do if there's no netdev */
+	if (!endpoint->netdev)
+		return false;
+
+	/* assert(len <= SKB_WITH_OVERHEAD(IPA_RX_BUFFER_SIZE-NET_SKB_PAD)); */
+	skb = build_skb(page_address(page), IPA_RX_BUFFER_SIZE);
+	if (skb) {
+		/* Reserve the headroom and account for the data */
+		skb_reserve(skb, NET_SKB_PAD);
+		skb_put(skb, len);
+	}
+
+	/* Receive the buffer (or record drop if unable to build it) */
+	ipa_modem_skb_rx(endpoint->netdev, skb);
+
+	return skb != NULL;
+}
+
+/* The format of a packet status element is the same for several status
+ * types (opcodes).  The NEW_FRAG_RULE, LOG, DCMP (decompression) types
+ * aren't currently supported
+ */
+static bool ipa_status_format_packet(enum ipa_status_opcode opcode)
+{
+	switch (opcode) {
+	case IPA_STATUS_OPCODE_PACKET:
+	case IPA_STATUS_OPCODE_DROPPED_PACKET:
+	case IPA_STATUS_OPCODE_SUSPENDED_PACKET:
+	case IPA_STATUS_OPCODE_PACKET_2ND_PASS:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool ipa_endpoint_status_skip(struct ipa_endpoint *endpoint,
+				     const struct ipa_status *status)
+{
+	u32 endpoint_id;
+
+	if (!ipa_status_format_packet(status->opcode))
+		return true;
+	if (!status->pkt_len)
+		return true;
+	endpoint_id = u32_get_bits(status->endp_dst_idx,
+				   IPA_STATUS_DST_IDX_FMASK);
+	if (endpoint_id != endpoint->endpoint_id)
+		return true;
+
+	return false;	/* Don't skip this packet, process it */
+}
+
+/* Return whether the status indicates the packet should be dropped */
+static bool ipa_status_drop_packet(const struct ipa_status *status)
+{
+	u32 val;
+
+	/* Deaggregation exceptions we drop; others we consume */
+	if (status->exception)
+		return status->exception == IPA_STATUS_EXCEPTION_DEAGGR;
+
+	/* Drop the packet if it fails to match a routing rule; otherwise no */
+	val = le32_get_bits(status->flags1, IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK);
+
+	return val == field_max(IPA_STATUS_FLAGS1_RT_RULE_ID_FMASK);
+}
+
+static void ipa_endpoint_status_parse(struct ipa_endpoint *endpoint,
+				      struct page *page, u32 total_len)
+{
+	void *data = page_address(page) + NET_SKB_PAD;
+	u32 unused = IPA_RX_BUFFER_SIZE - total_len;
+	u32 resid = total_len;
+
+	while (resid) {
+		const struct ipa_status *status = data;
+		u32 align;
+		u32 len;
+
+		if (resid < sizeof(*status)) {
+			dev_err(&endpoint->ipa->pdev->dev,
+				"short message (%u bytes < %zu byte status)\n",
+				resid, sizeof(*status));
+			break;
+		}
+
+		/* Skip over status packets that lack packet data */
+		if (ipa_endpoint_status_skip(endpoint, status)) {
+			data += sizeof(*status);
+			resid -= sizeof(*status);
+			continue;
+		}
+
+		/* Compute the amount of buffer space consumed by the
+		 * packet, including the status element.  If the hardware
+		 * is configured to pad packet data to an aligned boundary,
+		 * account for that.  And if checksum offload is is enabled
+		 * a trailer containing computed checksum information will
+		 * be appended.
+		 */
+		align = endpoint->data->rx.pad_align ? : 1;
+		len = le16_to_cpu(status->pkt_len);
+		len = sizeof(*status) + ALIGN(len, align);
+		if (endpoint->data->checksum)
+			len += sizeof(struct rmnet_map_dl_csum_trailer);
+
+		/* Charge the new packet with a proportional fraction of
+		 * the unused space in the original receive buffer.
+		 * XXX Charge a proportion of the *whole* receive buffer?
+		 */
+		if (!ipa_status_drop_packet(status)) {
+			u32 extra = unused * len / total_len;
+			void *data2 = data + sizeof(*status);
+			u32 len2 = le16_to_cpu(status->pkt_len);
+
+			/* Client receives only packet data (no status) */
+			ipa_endpoint_skb_copy(endpoint, data2, len2, extra);
+		}
+
+		/* Consume status and the full packet it describes */
+		data += len;
+		resid -= len;
+	}
+}
+
+/* Complete a TX transaction, command or from ipa_endpoint_skb_tx() */
+static void ipa_endpoint_tx_complete(struct ipa_endpoint *endpoint,
+				     struct gsi_trans *trans)
+{
+}
+
+/* Complete transaction initiated in ipa_endpoint_replenish_one() */
+static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
+				     struct gsi_trans *trans)
+{
+	struct page *page;
+
+	ipa_endpoint_replenish(endpoint, 1);
+
+	if (trans->cancelled)
+		return;
+
+	/* Parse or build a socket buffer using the actual received length */
+	page = trans->data;
+	if (endpoint->data->status_enable)
+		ipa_endpoint_status_parse(endpoint, page, trans->len);
+	else if (ipa_endpoint_skb_build(endpoint, page, trans->len))
+		trans->data = NULL;	/* Pages have been consumed */
+}
+
+void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
+				 struct gsi_trans *trans)
+{
+	if (endpoint->toward_ipa)
+		ipa_endpoint_tx_complete(endpoint, trans);
+	else
+		ipa_endpoint_rx_complete(endpoint, trans);
+}
+
+void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
+				struct gsi_trans *trans)
+{
+	if (endpoint->toward_ipa) {
+		struct ipa *ipa = endpoint->ipa;
+
+		/* Nothing to do for command transactions */
+		if (endpoint != ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]) {
+			struct sk_buff *skb = trans->data;
+
+			if (skb)
+				dev_kfree_skb_any(skb);
+		}
+	} else {
+		struct page *page = trans->data;
+
+		if (page)
+			__free_pages(page, IPA_RX_BUFFER_ORDER);
+	}
+}
+
+void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id)
+{
+	u32 val;
+
+	/* ROUTE_DIS is 0 */
+	val = u32_encode_bits(endpoint_id, ROUTE_DEF_PIPE_FMASK);
+	val |= ROUTE_DEF_HDR_TABLE_FMASK;
+	val |= u32_encode_bits(0, ROUTE_DEF_HDR_OFST_FMASK);
+	val |= u32_encode_bits(endpoint_id, ROUTE_FRAG_DEF_PIPE_FMASK);
+	val |= ROUTE_DEF_RETAIN_HDR_FMASK;
+
+	iowrite32(val, ipa->reg_virt + IPA_REG_ROUTE_OFFSET);
+}
+
+void ipa_endpoint_default_route_clear(struct ipa *ipa)
+{
+	ipa_endpoint_default_route_set(ipa, 0);
+}
+
+static bool ipa_endpoint_aggr_active(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	u32 offset;
+	u32 val;
+
+	/* assert(mask & ipa->available); */
+	offset = ipa_reg_state_aggr_active_offset(ipa->version);
+	val = ioread32(ipa->reg_virt + offset);
+
+	return !!(val & mask);
+}
+
+static void ipa_endpoint_force_close(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+
+	/* assert(mask & ipa->available); */
+	iowrite32(mask, ipa->reg_virt + IPA_REG_AGGR_FORCE_CLOSE_OFFSET);
+}
+
+/**
+ * ipa_endpoint_reset_rx_aggr() - Reset RX endpoint with aggregation active
+ * @endpoint:	Endpoint to be reset
+ *
+ * If aggregation is active on an RX endpoint when a reset is performed
+ * on its underlying GSI channel, a special sequence of actions must be
+ * taken to ensure the IPA pipeline is properly cleared.
+ *
+ * @Return:	0 if successful, or a negative error code
+ */
+static int ipa_endpoint_reset_rx_aggr(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	struct ipa *ipa = endpoint->ipa;
+	bool endpoint_suspended = false;
+	struct gsi *gsi = &ipa->gsi;
+	dma_addr_t addr;
+	bool db_enable;
+	u32 retries;
+	u32 len = 1;
+	void *virt;
+	int ret;
+
+	virt = kzalloc(len, GFP_KERNEL);
+	if (!virt)
+		return -ENOMEM;
+
+	addr = dma_map_single(dev, virt, len, DMA_FROM_DEVICE);
+	if (dma_mapping_error(dev, addr)) {
+		ret = -ENOMEM;
+		goto out_kfree;
+	}
+
+	/* Force close aggregation before issuing the reset */
+	ipa_endpoint_force_close(endpoint);
+
+	/* Reset and reconfigure the channel with the doorbell engine
+	 * disabled.  Then poll until we know aggregation is no longer
+	 * active.  We'll re-enable the doorbell (if appropriate) when
+	 * we reset again below.
+	 */
+	gsi_channel_reset(gsi, endpoint->channel_id, false);
+
+	/* Make sure the channel isn't suspended */
+	if (endpoint->ipa->version == IPA_VERSION_3_5_1)
+		if (!ipa_endpoint_init_ctrl(endpoint, false))
+			endpoint_suspended = true;
+
+	/* Start channel and do a 1 byte read */
+	ret = gsi_channel_start(gsi, endpoint->channel_id);
+	if (ret)
+		goto out_suspend_again;
+
+	ret = gsi_trans_read_byte(gsi, endpoint->channel_id, addr);
+	if (ret)
+		goto err_endpoint_stop;
+
+	/* Wait for aggregation to be closed on the channel */
+	retries = IPA_ENDPOINT_RESET_AGGR_RETRY_MAX;
+	do {
+		if (!ipa_endpoint_aggr_active(endpoint))
+			break;
+		msleep(1);
+	} while (retries--);
+
+	/* Check one last time */
+	if (ipa_endpoint_aggr_active(endpoint))
+		dev_err(dev, "endpoint %u still active during reset\n",
+			endpoint->endpoint_id);
+
+	gsi_trans_read_byte_done(gsi, endpoint->channel_id);
+
+	ret = ipa_endpoint_stop(endpoint);
+	if (ret)
+		goto out_suspend_again;
+
+	/* Finally, reset and reconfigure the channel again (re-enabling the
+	 * the doorbell engine if appropriate).  Sleep for 1 millisecond to
+	 * complete the channel reset sequence.  Finish by suspending the
+	 * channel again (if necessary).
+	 */
+	db_enable = ipa->version == IPA_VERSION_3_5_1;
+	gsi_channel_reset(gsi, endpoint->channel_id, db_enable);
+
+	msleep(1);
+
+	goto out_suspend_again;
+
+err_endpoint_stop:
+	ipa_endpoint_stop(endpoint);
+out_suspend_again:
+	if (endpoint_suspended)
+		(void)ipa_endpoint_init_ctrl(endpoint, true);
+	dma_unmap_single(dev, addr, len, DMA_FROM_DEVICE);
+out_kfree:
+	kfree(virt);
+
+	return ret;
+}
+
+static void ipa_endpoint_reset(struct ipa_endpoint *endpoint)
+{
+	u32 channel_id = endpoint->channel_id;
+	struct ipa *ipa = endpoint->ipa;
+	bool db_enable;
+	bool special;
+	int ret = 0;
+
+	/* On IPA v3.5.1, if an RX endpoint is reset while aggregation
+	 * is active, we need to handle things specially to recover.
+	 * All other cases just need to reset the underlying GSI channel.
+	 *
+	 * IPA v3.5.1 enables the doorbell engine.  Newer versions do not.
+	 */
+	db_enable = ipa->version == IPA_VERSION_3_5_1;
+	special = !endpoint->toward_ipa && endpoint->data->aggregation;
+	if (special && ipa_endpoint_aggr_active(endpoint))
+		ret = ipa_endpoint_reset_rx_aggr(endpoint);
+	else
+		gsi_channel_reset(&ipa->gsi, channel_id, db_enable);
+
+	if (ret)
+		dev_err(&ipa->pdev->dev,
+			"error %d resetting channel %u for endpoint %u\n",
+			ret, endpoint->channel_id, endpoint->endpoint_id);
+}
+
+static int ipa_endpoint_stop_rx_dma(struct ipa *ipa)
+{
+	u16 size = IPA_ENDPOINT_STOP_RX_SIZE;
+	struct gsi_trans *trans;
+	dma_addr_t addr;
+	int ret;
+
+	trans = ipa_cmd_trans_alloc(ipa, 1);
+	if (!trans) {
+		dev_err(&ipa->pdev->dev,
+			"no transaction for RX endpoint STOP workaround\n");
+		return -EBUSY;
+	}
+
+	/* Read into the highest part of the zero memory area */
+	addr = ipa->zero_addr + ipa->zero_size - size;
+
+	ipa_cmd_dma_task_32b_addr_add(trans, size, addr, false);
+
+	ret = gsi_trans_commit_wait_timeout(trans, ENDPOINT_STOP_DMA_TIMEOUT);
+	if (ret)
+		gsi_trans_free(trans);
+
+	return ret;
+}
+
+/**
+ * ipa_endpoint_stop() - Stops a GSI channel in IPA
+ * @client:	Client whose endpoint should be stopped
+ *
+ * This function implements the sequence to stop a GSI channel
+ * in IPA. This function returns when the channel is is STOP state.
+ *
+ * Return value: 0 on success, negative otherwise
+ */
+int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
+{
+	u32 retries = endpoint->toward_ipa ? 0 : IPA_ENDPOINT_STOP_RX_RETRIES;
+	int ret;
+
+	do {
+		struct ipa *ipa = endpoint->ipa;
+		struct gsi *gsi = &ipa->gsi;
+
+		ret = gsi_channel_stop(gsi, endpoint->channel_id);
+		if (ret != -EAGAIN)
+			break;
+
+		if (endpoint->toward_ipa)
+			continue;
+
+		/* For IPA v3.5.1, send a DMA read task and check again */
+		if (ipa->version == IPA_VERSION_3_5_1) {
+			ret = ipa_endpoint_stop_rx_dma(ipa);
+			if (ret)
+				break;
+		}
+
+		msleep(1);
+	} while (retries--);
+
+	return retries ? ret : -EIO;
+}
+
+static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	int ret;
+
+	if (endpoint->toward_ipa) {
+		bool delay_mode = endpoint->data->tx.delay;
+
+		ret = ipa_endpoint_init_ctrl(endpoint, delay_mode);
+		/* Endpoint is expected to not be in delay mode */
+		if (!ret != delay_mode) {
+			dev_warn(dev,
+				"TX endpoint %u was %sin delay mode\n",
+				endpoint->endpoint_id,
+				delay_mode ? "already " : "");
+		}
+		ipa_endpoint_init_hdr_ext(endpoint);
+		ipa_endpoint_init_aggr(endpoint);
+		ipa_endpoint_init_deaggr(endpoint);
+		ipa_endpoint_init_seq(endpoint);
+	} else {
+		if (endpoint->ipa->version == IPA_VERSION_3_5_1) {
+			if (!ipa_endpoint_init_ctrl(endpoint, false))
+				dev_warn(dev,
+					"RX endpoint %u was suspended\n",
+					endpoint->endpoint_id);
+		}
+		ipa_endpoint_init_hdr_ext(endpoint);
+		ipa_endpoint_init_aggr(endpoint);
+	}
+	ipa_endpoint_init_cfg(endpoint);
+	ipa_endpoint_init_hdr(endpoint);
+	ipa_endpoint_init_hdr_metadata_mask(endpoint);
+	ipa_endpoint_init_mode(endpoint);
+	ipa_endpoint_status(endpoint);
+}
+
+int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint)
+{
+	struct ipa *ipa = endpoint->ipa;
+	struct gsi *gsi = &ipa->gsi;
+	int ret;
+
+	ret = gsi_channel_start(gsi, endpoint->channel_id);
+	if (ret) {
+		dev_err(&ipa->pdev->dev,
+			"error %d starting %cX channel %u for endpoint %u\n",
+			ret, endpoint->toward_ipa ? 'T' : 'R',
+			endpoint->channel_id, endpoint->endpoint_id);
+		return ret;
+	}
+
+	if (!endpoint->toward_ipa) {
+		ipa_interrupt_suspend_enable(ipa->interrupt,
+					     endpoint->endpoint_id);
+		ipa_endpoint_replenish_enable(endpoint);
+	}
+
+	ipa->enabled |= BIT(endpoint->endpoint_id);
+
+	return 0;
+}
+
+void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint)
+{
+	u32 mask = BIT(endpoint->endpoint_id);
+	struct ipa *ipa = endpoint->ipa;
+	int ret;
+
+	if (!(endpoint->ipa->enabled & mask))
+		return;
+
+	endpoint->ipa->enabled ^= mask;
+
+	if (!endpoint->toward_ipa) {
+		ipa_endpoint_replenish_disable(endpoint);
+		ipa_interrupt_suspend_disable(ipa->interrupt,
+					      endpoint->endpoint_id);
+	}
+
+	/* Note that if stop fails, the channel's state is not well-defined */
+	ret = ipa_endpoint_stop(endpoint);
+	if (ret)
+		dev_err(&ipa->pdev->dev,
+			"error %d attempting to stop endpoint %u\n", ret,
+			endpoint->endpoint_id);
+}
+
+/**
+ * ipa_endpoint_suspend_aggr() - Emulate suspend interrupt
+ * @endpoint_id:	Endpoint on which to emulate a suspend
+ *
+ *  Emulate suspend IPA interrupt to unsuspend an endpoint suspended
+ *  with an open aggregation frame.  This is to work around a hardware
+ *  issue in IPA version 3.5.1 where the suspend interrupt will not be
+ *  generated when it should be.
+ */
+static void ipa_endpoint_suspend_aggr(struct ipa_endpoint *endpoint)
+{
+	struct ipa *ipa = endpoint->ipa;
+
+	/* assert(ipa->version == IPA_VERSION_3_5_1); */
+
+	if (!endpoint->data->aggregation)
+		return;
+
+	/* Nothing to do if the endpoint doesn't have aggregation open */
+	if (!ipa_endpoint_aggr_active(endpoint))
+		return;
+
+	/* Force close aggregation */
+	ipa_endpoint_force_close(endpoint);
+
+	ipa_interrupt_simulate_suspend(ipa->interrupt);
+}
+
+void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	bool stop_channel;
+	int ret;
+
+	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
+		return;
+
+	if (!endpoint->toward_ipa)
+		ipa_endpoint_replenish_disable(endpoint);
+
+	/* IPA v3.5.1 doesn't use channel stop for suspend */
+	stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
+	if (!endpoint->toward_ipa && !stop_channel) {
+		/* Due to a hardware bug, a client suspended with an open
+		 * aggregation frame will not generate a SUSPEND IPA
+		 * interrupt.  We work around this by force-closing the
+		 * aggregation frame, then simulating the arrival of such
+		 * an interrupt.
+		 */
+		WARN_ON(ipa_endpoint_init_ctrl(endpoint, true));
+		ipa_endpoint_suspend_aggr(endpoint);
+	}
+
+	ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
+	if (ret)
+		dev_err(dev, "error %d suspending channel %u\n", ret,
+			endpoint->channel_id);
+}
+
+void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
+{
+	struct device *dev = &endpoint->ipa->pdev->dev;
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	bool start_channel;
+	int ret;
+
+	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
+		return;
+
+	/* IPA v3.5.1 doesn't use channel start for resume */
+	start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
+	if (!endpoint->toward_ipa && !start_channel)
+		WARN_ON(ipa_endpoint_init_ctrl(endpoint, false));
+
+	ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
+	if (ret)
+		dev_err(dev, "error %d resuming channel %u\n", ret,
+			endpoint->channel_id);
+	else if (!endpoint->toward_ipa)
+		ipa_endpoint_replenish_enable(endpoint);
+}
+
+void ipa_endpoint_suspend(struct ipa *ipa)
+{
+	if (ipa->modem_netdev)
+		ipa_modem_suspend(ipa->modem_netdev);
+
+	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
+	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
+}
+
+void ipa_endpoint_resume(struct ipa *ipa)
+{
+	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
+	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
+
+	if (ipa->modem_netdev)
+		ipa_modem_resume(ipa->modem_netdev);
+}
+
+static void ipa_endpoint_setup_one(struct ipa_endpoint *endpoint)
+{
+	struct gsi *gsi = &endpoint->ipa->gsi;
+	u32 channel_id = endpoint->channel_id;
+
+	/* Only AP endpoints get set up */
+	if (endpoint->ee_id != GSI_EE_AP)
+		return;
+
+	endpoint->trans_tre_max = gsi_channel_trans_tre_max(gsi, channel_id);
+	if (!endpoint->toward_ipa) {
+		/* RX transactions require a single TRE, so the maximum
+		 * backlog is the same as the maximum outstanding TREs.
+		 */
+		endpoint->replenish_enabled = false;
+		atomic_set(&endpoint->replenish_saved,
+			   gsi_channel_tre_max(gsi, endpoint->channel_id));
+		atomic_set(&endpoint->replenish_backlog, 0);
+		INIT_DELAYED_WORK(&endpoint->replenish_work,
+				  ipa_endpoint_replenish_work);
+	}
+
+	ipa_endpoint_program(endpoint);
+
+	endpoint->ipa->set_up |= BIT(endpoint->endpoint_id);
+}
+
+static void ipa_endpoint_teardown_one(struct ipa_endpoint *endpoint)
+{
+	endpoint->ipa->set_up &= ~BIT(endpoint->endpoint_id);
+
+	if (!endpoint->toward_ipa)
+		cancel_delayed_work_sync(&endpoint->replenish_work);
+
+	ipa_endpoint_reset(endpoint);
+}
+
+void ipa_endpoint_setup(struct ipa *ipa)
+{
+	u32 initialized = ipa->initialized;
+
+	ipa->set_up = 0;
+	while (initialized) {
+		u32 endpoint_id = __ffs(initialized);
+
+		initialized ^= BIT(endpoint_id);
+
+		ipa_endpoint_setup_one(&ipa->endpoint[endpoint_id]);
+	}
+}
+
+void ipa_endpoint_teardown(struct ipa *ipa)
+{
+	u32 set_up = ipa->set_up;
+
+	while (set_up) {
+		u32 endpoint_id = __fls(set_up);
+
+		set_up ^= BIT(endpoint_id);
+
+		ipa_endpoint_teardown_one(&ipa->endpoint[endpoint_id]);
+	}
+	ipa->set_up = 0;
+}
+
+int ipa_endpoint_config(struct ipa *ipa)
+{
+	struct device *dev = &ipa->pdev->dev;
+	u32 initialized;
+	u32 rx_base;
+	u32 rx_mask;
+	u32 tx_mask;
+	int ret = 0;
+	u32 max;
+	u32 val;
+
+	/* Find out about the endpoints supplied by the hardware, and ensure
+	 * the highest one doesn't exceed the number we support.
+	 */
+	val = ioread32(ipa->reg_virt + IPA_REG_FLAVOR_0_OFFSET);
+
+	/* Our RX is an IPA producer */
+	rx_base = u32_get_bits(val, BAM_PROD_LOWEST_FMASK);
+	max = rx_base + u32_get_bits(val, BAM_MAX_PROD_PIPES_FMASK);
+	if (max > IPA_ENDPOINT_MAX) {
+		dev_err(dev, "too many endpoints (%u > %u)\n",
+			max, IPA_ENDPOINT_MAX);
+		return -EINVAL;
+	}
+	rx_mask = GENMASK(max - 1, rx_base);
+
+	/* Our TX is an IPA consumer */
+	max = u32_get_bits(val, BAM_MAX_CONS_PIPES_FMASK);
+	tx_mask = GENMASK(max - 1, 0);
+
+	ipa->available = rx_mask | tx_mask;
+
+	/* Check for initialized endpoints not supported by the hardware */
+	if (ipa->initialized & ~ipa->available) {
+		dev_err(dev, "unavailable endpoint id(s) 0x%08x\n",
+			ipa->initialized & ~ipa->available);
+		ret = -EINVAL;		/* Report other errors too */
+	}
+
+	initialized = ipa->initialized;
+	while (initialized) {
+		u32 endpoint_id = __ffs(initialized);
+		struct ipa_endpoint *endpoint;
+
+		initialized ^= BIT(endpoint_id);
+
+		/* Make sure it's pointing in the right direction */
+		endpoint = &ipa->endpoint[endpoint_id];
+		if ((endpoint_id < rx_base) != !!endpoint->toward_ipa) {
+			dev_err(dev, "endpoint id %u wrong direction\n",
+				endpoint_id);
+			ret = -EINVAL;
+		}
+	}
+
+	return ret;
+}
+
+void ipa_endpoint_deconfig(struct ipa *ipa)
+{
+	ipa->available = 0;	/* Nothing more to do */
+}
+
+static void ipa_endpoint_init_one(struct ipa *ipa, enum ipa_endpoint_name name,
+				  const struct ipa_gsi_endpoint_data *data)
+{
+	struct ipa_endpoint *endpoint;
+
+	endpoint = &ipa->endpoint[data->endpoint_id];
+
+	if (data->ee_id == GSI_EE_AP)
+		ipa->channel_map[data->channel_id] = endpoint;
+	ipa->name_map[name] = endpoint;
+
+	endpoint->ipa = ipa;
+	endpoint->ee_id = data->ee_id;
+	endpoint->seq_type = data->endpoint.seq_type;
+	endpoint->channel_id = data->channel_id;
+	endpoint->endpoint_id = data->endpoint_id;
+	endpoint->toward_ipa = data->toward_ipa;
+	endpoint->data = &data->endpoint.config;
+
+	ipa->initialized |= BIT(endpoint->endpoint_id);
+}
+
+void ipa_endpoint_exit_one(struct ipa_endpoint *endpoint)
+{
+	endpoint->ipa->initialized &= ~BIT(endpoint->endpoint_id);
+
+	memset(endpoint, 0, sizeof(*endpoint));
+}
+
+void ipa_endpoint_exit(struct ipa *ipa)
+{
+	u32 initialized = ipa->initialized;
+
+	while (initialized) {
+		u32 endpoint_id = __fls(initialized);
+
+		initialized ^= BIT(endpoint_id);
+
+		ipa_endpoint_exit_one(&ipa->endpoint[endpoint_id]);
+	}
+	memset(ipa->name_map, 0, sizeof(ipa->name_map));
+	memset(ipa->channel_map, 0, sizeof(ipa->channel_map));
+}
+
+/* Returns a bitmask of endpoints that support filtering, or 0 on error */
+u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
+		      const struct ipa_gsi_endpoint_data *data)
+{
+	enum ipa_endpoint_name name;
+	u32 filter_map;
+
+	if (!ipa_endpoint_data_valid(ipa, count, data))
+		return 0;	/* Error */
+
+	ipa->initialized = 0;
+
+	filter_map = 0;
+	for (name = 0; name < count; name++, data++) {
+		if (ipa_gsi_endpoint_data_empty(data))
+			continue;	/* Skip over empty slots */
+
+		ipa_endpoint_init_one(ipa, name, data);
+
+		if (data->endpoint.filter_support)
+			filter_map |= BIT(data->endpoint_id);
+	}
+
+	if (!ipa_filter_map_valid(ipa, filter_map))
+		goto err_endpoint_exit;
+
+	return filter_map;	/* Non-zero bitmask */
+
+err_endpoint_exit:
+	ipa_endpoint_exit(ipa);
+
+	return 0;	/* Error */
+}
diff --git a/drivers/net/ipa/ipa_endpoint.h b/drivers/net/ipa/ipa_endpoint.h
new file mode 100644
index 0000000000000..4b336a1f759d4
--- /dev/null
+++ b/drivers/net/ipa/ipa_endpoint.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2019-2020 Linaro Ltd.
+ */
+#ifndef _IPA_ENDPOINT_H_
+#define _IPA_ENDPOINT_H_
+
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <linux/if_ether.h>
+
+#include "gsi.h"
+#include "ipa_reg.h"
+
+struct net_device;
+struct sk_buff;
+
+struct ipa;
+struct ipa_gsi_endpoint_data;
+
+/* Non-zero granularity of counter used to implement aggregation timeout */
+#define IPA_AGGR_GRANULARITY		500	/* microseconds */
+
+#define IPA_MTU			ETH_DATA_LEN
+
+enum ipa_endpoint_name {
+	IPA_ENDPOINT_AP_MODEM_TX	= 0,
+	IPA_ENDPOINT_MODEM_LAN_TX,
+	IPA_ENDPOINT_MODEM_COMMAND_TX,
+	IPA_ENDPOINT_AP_COMMAND_TX,
+	IPA_ENDPOINT_MODEM_AP_TX,
+	IPA_ENDPOINT_AP_LAN_RX,
+	IPA_ENDPOINT_AP_MODEM_RX,
+	IPA_ENDPOINT_MODEM_AP_RX,
+	IPA_ENDPOINT_MODEM_LAN_RX,
+	IPA_ENDPOINT_COUNT,	/* Number of names (not an index) */
+};
+
+#define IPA_ENDPOINT_MAX		32	/* Max supported by driver */
+
+/**
+ * struct ipa_endpoint - IPA endpoint information
+ * @client:	Client associated with the endpoint
+ * @channel_id:	EP's GSI channel
+ * @evt_ring_id: EP's GSI channel event ring
+ */
+struct ipa_endpoint {
+	struct ipa *ipa;
+	enum ipa_seq_type seq_type;
+	enum gsi_ee_id ee_id;
+	u32 channel_id;
+	u32 endpoint_id;
+	bool toward_ipa;
+	const struct ipa_endpoint_config_data *data;
+
+	u32 trans_tre_max;	/* maximum descriptors per transaction */
+	u32 evt_ring_id;
+
+	/* Net device this endpoint is associated with, if any */
+	struct net_device *netdev;
+
+	/* Receive buffer replenishing for RX endpoints */
+	bool replenish_enabled;
+	u32 replenish_ready;
+	atomic_t replenish_saved;
+	atomic_t replenish_backlog;
+	struct delayed_work replenish_work;		/* global wq */
+};
+
+void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa);
+
+void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable);
+
+int ipa_endpoint_modem_exception_reset_all(struct ipa *ipa);
+
+int ipa_endpoint_skb_tx(struct ipa_endpoint *endpoint, struct sk_buff *skb);
+
+int ipa_endpoint_stop(struct ipa_endpoint *endpoint);
+
+void ipa_endpoint_exit_one(struct ipa_endpoint *endpoint);
+
+int ipa_endpoint_enable_one(struct ipa_endpoint *endpoint);
+void ipa_endpoint_disable_one(struct ipa_endpoint *endpoint);
+
+void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint);
+void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint);
+
+void ipa_endpoint_suspend(struct ipa *ipa);
+void ipa_endpoint_resume(struct ipa *ipa);
+
+void ipa_endpoint_setup(struct ipa *ipa);
+void ipa_endpoint_teardown(struct ipa *ipa);
+
+int ipa_endpoint_config(struct ipa *ipa);
+void ipa_endpoint_deconfig(struct ipa *ipa);
+
+void ipa_endpoint_default_route_set(struct ipa *ipa, u32 endpoint_id);
+void ipa_endpoint_default_route_clear(struct ipa *ipa);
+
+u32 ipa_endpoint_init(struct ipa *ipa, u32 count,
+		      const struct ipa_gsi_endpoint_data *data);
+void ipa_endpoint_exit(struct ipa *ipa);
+
+void ipa_endpoint_trans_complete(struct ipa_endpoint *ipa,
+				 struct gsi_trans *trans);
+void ipa_endpoint_trans_release(struct ipa_endpoint *ipa,
+				struct gsi_trans *trans);
+
+#endif /* _IPA_ENDPOINT_H_ */
-- 
2.20.1

[PATCH AUTOSEL 5.6 23/62] net: ipa: fix a bug in ipa_endpoint_stop()

[Sasha Levin]

From: Alex Elder <elder@linaro.org>

[ Upstream commit 713b6ebb4c376b3fb65fdceb3b59e401c93248f9 ]

In ipa_endpoint_stop(), for TX endpoints we set the number of retries
to 0.  When we break out of the loop, retries being 0 means we return
EIO rather than the value of ret (which should be 0).

Fix this by using a non-zero retry count for both RX and TX
channels, and just break out of the loop after calling
gsi_channel_stop() for TX channels.  This way only RX channels
will retry, and the retry count will be non-zero at the end
for TX channels (so the proper value gets returned).

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ipa/ipa_endpoint.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 915b4cd05dd29..78ed431e6eb86 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1284,7 +1284,7 @@ static int ipa_endpoint_stop_rx_dma(struct ipa *ipa)
  */
 int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
 {
-	u32 retries = endpoint->toward_ipa ? 0 : IPA_ENDPOINT_STOP_RX_RETRIES;
+	u32 retries = IPA_ENDPOINT_STOP_RX_RETRIES;
 	int ret;
 
 	do {
@@ -1292,12 +1292,9 @@ int ipa_endpoint_stop(struct ipa_endpoint *endpoint)
 		struct gsi *gsi = &ipa->gsi;
 
 		ret = gsi_channel_stop(gsi, endpoint->channel_id);
-		if (ret != -EAGAIN)
+		if (ret != -EAGAIN || endpoint->toward_ipa)
 			break;
 
-		if (endpoint->toward_ipa)
-			continue;
-
 		/* For IPA v3.5.1, send a DMA read task and check again */
 		if (ipa->version == IPA_VERSION_3_5_1) {
 			ret = ipa_endpoint_stop_rx_dma(ipa);
-- 
2.20.1

[PATCH AUTOSEL 5.6 24/62] net: moxa: Fix a potential double 'free_irq()'

[Sasha Levin]

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit ee8d2267f0e39a1bfd95532da3a6405004114b27 ]

Should an irq requested with 'devm_request_irq' be released explicitly,
it should be done by 'devm_free_irq()', not 'free_irq()'.

Fixes: 6c821bd9edc9 ("net: Add MOXA ART SoCs ethernet driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/moxa/moxart_ether.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
index e1651756bf9da..f70bb81e1ed65 100644
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -564,7 +564,7 @@ static int moxart_remove(struct platform_device *pdev)
 	struct net_device *ndev = platform_get_drvdata(pdev);
 
 	unregister_netdev(ndev);
-	free_irq(ndev->irq, ndev);
+	devm_free_irq(&pdev->dev, ndev->irq, ndev);
 	moxart_mac_free_memory(ndev);
 	free_netdev(ndev);
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 25/62] ftrace/selftests: workaround cgroup RT scheduling issues

[Sasha Levin]

From: Alan Maguire <alan.maguire@oracle.com>

[ Upstream commit 57c4cfd4a2eef8f94052bd7c0fce0981f74fb213 ]

wakeup_rt.tc and wakeup.tc tests in tracers/ subdirectory
fail due to the chrt command returning:

 chrt: failed to set pid 0's policy: Operation not permitted.

To work around this, temporarily disable grout RT scheduling
during ftracetest execution.  Restore original value on
test run completion.  With these changes in place, both
tests consistently pass.

Fixes: c575dea2c1a5 ("selftests/ftrace: Add wakeup_rt tracer testcase")
Fixes: c1edd060b413 ("selftests/ftrace: Add wakeup tracer testcase")
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/ftrace/ftracetest | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 063ecb290a5a3..144308a757b70 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -29,8 +29,25 @@ err_ret=1
 # kselftest skip code is 4
 err_skip=4
 
+# cgroup RT scheduling prevents chrt commands from succeeding, which
+# induces failures in test wakeup tests.  Disable for the duration of
+# the tests.
+
+readonly sched_rt_runtime=/proc/sys/kernel/sched_rt_runtime_us
+
+sched_rt_runtime_orig=$(cat $sched_rt_runtime)
+
+setup() {
+  echo -1 > $sched_rt_runtime
+}
+
+cleanup() {
+  echo $sched_rt_runtime_orig > $sched_rt_runtime
+}
+
 errexit() { # message
   echo "Error: $1" 1>&2
+  cleanup
   exit $err_ret
 }
 
@@ -39,6 +56,8 @@ if [ `id -u` -ne 0 ]; then
   errexit "this must be run by root user"
 fi
 
+setup
+
 # Utilities
 absdir() { # file_path
   (cd `dirname $1`; pwd)
@@ -235,6 +254,7 @@ TOTAL_RESULT=0
 
 INSTANCE=
 CASENO=0
+
 testcase() { # testfile
   CASENO=$((CASENO+1))
   desc=`grep "^#[ \t]*description:" $1 | cut -f2 -d:`
@@ -406,5 +426,7 @@ prlog "# of unsupported: " `echo $UNSUPPORTED_CASES | wc -w`
 prlog "# of xfailed: " `echo $XFAILED_CASES | wc -w`
 prlog "# of undefined(test bug): " `echo $UNDEFINED_CASES | wc -w`
 
+cleanup
+
 # if no error, return 0
 exit $TOTAL_RESULT
-- 
2.20.1

[PATCH AUTOSEL 5.6 26/62] ftrace/selftest: make unresolved cases cause failure if --fail-unresolved set

[Sasha Levin]

From: Alan Maguire <alan.maguire@oracle.com>

[ Upstream commit b730d668138cb3dd9ce78f8003986d1adae5523a ]

Currently, ftracetest will return 1 (failure) if any unresolved cases
are encountered.  The unresolved status results from modules and
programs not being available, and as such does not indicate any
issues with ftrace itself.  As such, change the behaviour of
ftracetest in line with unsupported cases; if unsupported cases
happen, ftracetest still returns 0 unless --fail-unsupported.  Here
--fail-unresolved is added and the default is to return 0 if
unresolved results occur.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/ftrace/ftracetest | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 144308a757b70..19e9236dec5e2 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -17,6 +17,7 @@ echo "		-v|--verbose Increase verbosity of test messages"
 echo "		-vv        Alias of -v -v (Show all results in stdout)"
 echo "		-vvv       Alias of -v -v -v (Show all commands immediately)"
 echo "		--fail-unsupported Treat UNSUPPORTED as a failure"
+echo "		--fail-unresolved Treat UNRESOLVED as a failure"
 echo "		-d|--debug Debug mode (trace all shell commands)"
 echo "		-l|--logdir <dir> Save logs on the <dir>"
 echo "		            If <dir> is -, all logs output in console only"
@@ -112,6 +113,10 @@ parse_opts() { # opts
       UNSUPPORTED_RESULT=1
       shift 1
     ;;
+    --fail-unresolved)
+      UNRESOLVED_RESULT=1
+      shift 1
+    ;;
     --logdir|-l)
       LOG_DIR=$2
       shift 2
@@ -176,6 +181,7 @@ KEEP_LOG=0
 DEBUG=0
 VERBOSE=0
 UNSUPPORTED_RESULT=0
+UNRESOLVED_RESULT=0
 STOP_FAILURE=0
 # Parse command-line options
 parse_opts $*
@@ -280,7 +286,7 @@ eval_result() { # sigval
     $UNRESOLVED)
       prlog "	[${color_blue}UNRESOLVED${color_reset}]"
       UNRESOLVED_CASES="$UNRESOLVED_CASES $CASENO"
-      return 1 # this is a kind of bug.. something happened.
+      return $UNRESOLVED_RESULT # depends on use case
     ;;
     $UNTESTED)
       prlog "	[${color_blue}UNTESTED${color_reset}]"
-- 
2.20.1

[PATCH AUTOSEL 5.6 27/62] selftests: fix kvm relocatable native/cross builds and installs

[Sasha Levin]

From: Shuah Khan <skhan@linuxfoundation.org>

[ Upstream commit 66d69e081b526b6a6031f0d3ca8ddff71e5707a5 ]

kvm test Makefile doesn't fully support cross-builds and installs.
UNAME_M = $(shell uname -m) variable is used to define the target
programs and libraries to be built from arch specific sources in
sub-directories.

For cross-builds to work, UNAME_M has to map to ARCH and arch specific
directories and targets in this Makefile.

UNAME_M variable to used to run the compiles pointing to the right arch
directories and build the right targets for these supported architectures.

TEST_GEN_PROGS and LIBKVM are set using UNAME_M variable.
LINUX_TOOL_ARCH_INCLUDE is set using ARCH variable.

x86_64 targets are named to include x86_64 as a suffix and directories
for includes are in x86_64 sub-directory. s390x and aarch64 follow the
same convention. "uname -m" doesn't result in the correct mapping for
s390x and aarch64. Fix it to set UNAME_M correctly for s390x and aarch64
cross-builds.

In addition, Makefile doesn't create arch sub-directories in the case of
relocatable builds and test programs under s390x and x86_64 directories
fail to build. This is a problem for native and cross-builds. Fix it to
create all necessary directories keying off of TEST_GEN_PROGS.

The following use-cases work with this change:

Native x86_64:
make O=/tmp/kselftest -C tools/testing/selftests TARGETS=kvm install \
 INSTALL_PATH=$HOME/x86_64

arm64 cross-build:
make O=$HOME/arm64_build/ ARCH=arm64 HOSTCC=gcc \
	CROSS_COMPILE=aarch64-linux-gnu- defconfig

make O=$HOME/arm64_build/ ARCH=arm64 HOSTCC=gcc \
	CROSS_COMPILE=aarch64-linux-gnu- all

make kselftest-install TARGETS=kvm O=$HOME/arm64_build ARCH=arm64 \
	HOSTCC=gcc CROSS_COMPILE=aarch64-linux-gnu-

s390x cross-build:
make O=$HOME/s390x_build/ ARCH=s390 HOSTCC=gcc \
	CROSS_COMPILE=s390x-linux-gnu- defconfig

make O=$HOME/s390x_build/ ARCH=s390 HOSTCC=gcc \
	CROSS_COMPILE=s390x-linux-gnu- all

make kselftest-install TARGETS=kvm O=$HOME/s390x_build/ ARCH=s390 \
	HOSTCC=gcc CROSS_COMPILE=s390x-linux-gnu- all

No regressions in the following use-cases:
make -C tools/testing/selftests TARGETS=kvm
make kselftest-all TARGETS=kvm

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/kvm/Makefile | 29 +++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index d91c53b726e60..75dec268787f3 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -5,8 +5,34 @@ all:
 
 top_srcdir = ../../../..
 KSFT_KHDR_INSTALL := 1
+
+# For cross-builds to work, UNAME_M has to map to ARCH and arch specific
+# directories and targets in this Makefile. "uname -m" doesn't map to
+# arch specific sub-directory names.
+#
+# UNAME_M variable to used to run the compiles pointing to the right arch
+# directories and build the right targets for these supported architectures.
+#
+# TEST_GEN_PROGS and LIBKVM are set using UNAME_M variable.
+# LINUX_TOOL_ARCH_INCLUDE is set using ARCH variable.
+#
+# x86_64 targets are named to include x86_64 as a suffix and directories
+# for includes are in x86_64 sub-directory. s390x and aarch64 follow the
+# same convention. "uname -m" doesn't result in the correct mapping for
+# s390x and aarch64.
+#
+# No change necessary for x86_64
 UNAME_M := $(shell uname -m)
 
+# Set UNAME_M for arm64 compile/install to work
+ifeq ($(ARCH),arm64)
+	UNAME_M := aarch64
+endif
+# Set UNAME_M s390x compile/install to work
+ifeq ($(ARCH),s390)
+	UNAME_M := s390x
+endif
+
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c
 LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c
 LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
@@ -47,7 +73,7 @@ LIBKVM += $(LIBKVM_$(UNAME_M))
 INSTALL_HDR_PATH = $(top_srcdir)/usr
 LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/
 LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include
-LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/x86/include
+LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
 CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
 	-fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
 	-I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
@@ -78,6 +104,7 @@ $(LIBKVM_OBJ): $(OUTPUT)/%.o: %.c
 $(OUTPUT)/libkvm.a: $(LIBKVM_OBJ)
 	$(AR) crs $@ $^
 
+x := $(shell mkdir -p $(sort $(dir $(TEST_GEN_PROGS))))
 all: $(STATIC_LIBS)
 $(TEST_GEN_PROGS): $(STATIC_LIBS)
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 28/62] x86/apic: Move TSC deadline timer debug printk

[Sasha Levin]

From: Thomas Gleixner <tglx@linutronix.de>

[ Upstream commit c84cb3735fd53c91101ccdb191f2e3331a9262cb ]

Leon reported that the printk_once() in __setup_APIC_LVTT() triggers a
lockdep splat due to a lock order violation between hrtimer_base::lock and
console_sem, when the 'once' condition is reset via
/sys/kernel/debug/clear_warn_once after boot.

The initial printk cannot trigger this because that happens during boot
when the local APIC timer is set up on the boot CPU.

Prevent it by moving the printk to a place which is guaranteed to be only
called once during boot.

Mark the deadline timer check related functions and data __init while at
it.

Reported-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/87y2qhoshi.fsf@nanos.tec.linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/x86/kernel/apic/apic.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 5f973fed3c9ff..e289722b04f63 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -352,8 +352,6 @@ static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
 		 * According to Intel, MFENCE can do the serialization here.
 		 */
 		asm volatile("mfence" : : : "memory");
-
-		printk_once(KERN_DEBUG "TSC deadline timer enabled\n");
 		return;
 	}
 
@@ -552,7 +550,7 @@ static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
 #define DEADLINE_MODEL_MATCH_REV(model, rev)	\
 	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)rev }
 
-static u32 hsx_deadline_rev(void)
+static __init u32 hsx_deadline_rev(void)
 {
 	switch (boot_cpu_data.x86_stepping) {
 	case 0x02: return 0x3a; /* EP */
@@ -562,7 +560,7 @@ static u32 hsx_deadline_rev(void)
 	return ~0U;
 }
 
-static u32 bdx_deadline_rev(void)
+static __init u32 bdx_deadline_rev(void)
 {
 	switch (boot_cpu_data.x86_stepping) {
 	case 0x02: return 0x00000011;
@@ -574,7 +572,7 @@ static u32 bdx_deadline_rev(void)
 	return ~0U;
 }
 
-static u32 skx_deadline_rev(void)
+static __init u32 skx_deadline_rev(void)
 {
 	switch (boot_cpu_data.x86_stepping) {
 	case 0x03: return 0x01000136;
@@ -587,7 +585,7 @@ static u32 skx_deadline_rev(void)
 	return ~0U;
 }
 
-static const struct x86_cpu_id deadline_match[] = {
+static const struct x86_cpu_id deadline_match[] __initconst = {
 	DEADLINE_MODEL_MATCH_FUNC( INTEL_FAM6_HASWELL_X,	hsx_deadline_rev),
 	DEADLINE_MODEL_MATCH_REV ( INTEL_FAM6_BROADWELL_X,	0x0b000020),
 	DEADLINE_MODEL_MATCH_FUNC( INTEL_FAM6_BROADWELL_D,	bdx_deadline_rev),
@@ -609,18 +607,19 @@ static const struct x86_cpu_id deadline_match[] = {
 	{},
 };
 
-static void apic_check_deadline_errata(void)
+static __init bool apic_validate_deadline_timer(void)
 {
 	const struct x86_cpu_id *m;
 	u32 rev;
 
-	if (!boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER) ||
-	    boot_cpu_has(X86_FEATURE_HYPERVISOR))
-		return;
+	if (!boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER))
+		return false;
+	if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
+		return true;
 
 	m = x86_match_cpu(deadline_match);
 	if (!m)
-		return;
+		return true;
 
 	/*
 	 * Function pointers will have the MSB set due to address layout,
@@ -632,11 +631,12 @@ static void apic_check_deadline_errata(void)
 		rev = (u32)m->driver_data;
 
 	if (boot_cpu_data.microcode >= rev)
-		return;
+		return true;
 
 	setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
 	pr_err(FW_BUG "TSC_DEADLINE disabled due to Errata; "
 	       "please update microcode to version: 0x%x (or later)\n", rev);
+	return false;
 }
 
 /*
@@ -2098,7 +2098,8 @@ void __init init_apic_mappings(void)
 {
 	unsigned int new_apicid;
 
-	apic_check_deadline_errata();
+	if (apic_validate_deadline_timer())
+		pr_debug("TSC deadline timer available\n");
 
 	if (x2apic_mode) {
 		boot_cpu_physical_apicid = read_apic_id();
-- 
2.20.1

[PATCH AUTOSEL 5.6 29/62] hv_netvsc: Fix netvsc_start_xmit's return type

[Sasha Levin]

From: Nathan Chancellor <natechancellor@gmail.com>

[ Upstream commit 7fdc66debebc6a7170a37c8c9b0d9585a9788fb4 ]

netvsc_start_xmit is used as a callback function for the ndo_start_xmit
function pointer. ndo_start_xmit's return type is netdev_tx_t but
netvsc_start_xmit's return type is int.

This causes a failure with Control Flow Integrity (CFI), which requires
function pointer prototypes and callback function definitions to match
exactly. When CFI is in enforcing, the kernel panics. When booting a
CFI kernel with WSL 2, the VM is immediately terminated because of this.

The splat when CONFIG_CFI_PERMISSIVE is used:

[    5.916765] CFI failure (target: netvsc_start_xmit+0x0/0x10):
[    5.916771] WARNING: CPU: 8 PID: 0 at kernel/cfi.c:29 __cfi_check_fail+0x2e/0x40
[    5.916772] Modules linked in:
[    5.916774] CPU: 8 PID: 0 Comm: swapper/8 Not tainted 5.7.0-rc3-next-20200424-microsoft-cbl-00001-ged4eb37d2c69-dirty #1
[    5.916776] RIP: 0010:__cfi_check_fail+0x2e/0x40
[    5.916777] Code: 48 c7 c7 70 98 63 a9 48 c7 c6 11 db 47 a9 e8 69 55 59 00 85 c0 75 02 5b c3 48 c7 c7 73 c6 43 a9 48 89 de 31 c0 e8 12 2d f0 ff <0f> 0b 5b c3 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 00 85 f6 74 25
[    5.916778] RSP: 0018:ffffa803c0260b78 EFLAGS: 00010246
[    5.916779] RAX: 712a1af25779e900 RBX: ffffffffa8cf7950 RCX: ffffffffa962cf08
[    5.916779] RDX: ffffffffa9c36b60 RSI: 0000000000000082 RDI: ffffffffa9c36b5c
[    5.916780] RBP: ffff8ffc4779c2c0 R08: 0000000000000001 R09: ffffffffa9c3c300
[    5.916781] R10: 0000000000000151 R11: ffffffffa9c36b60 R12: ffff8ffe39084000
[    5.916782] R13: ffffffffa8cf7950 R14: ffffffffa8d12cb0 R15: ffff8ffe39320140
[    5.916784] FS:  0000000000000000(0000) GS:ffff8ffe3bc00000(0000) knlGS:0000000000000000
[    5.916785] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.916786] CR2: 00007ffef5749408 CR3: 00000002f4f5e000 CR4: 0000000000340ea0
[    5.916787] Call Trace:
[    5.916788]  <IRQ>
[    5.916790]  __cfi_check+0x3ab58/0x450e0
[    5.916793]  ? dev_hard_start_xmit+0x11f/0x160
[    5.916795]  ? sch_direct_xmit+0xf2/0x230
[    5.916796]  ? __dev_queue_xmit.llvm.11471227737707190958+0x69d/0x8e0
[    5.916797]  ? neigh_resolve_output+0xdf/0x220
[    5.916799]  ? neigh_connected_output.cfi_jt+0x8/0x8
[    5.916801]  ? ip6_finish_output2+0x398/0x4c0
[    5.916803]  ? nf_nat_ipv6_out+0x10/0xa0
[    5.916804]  ? nf_hook_slow+0x84/0x100
[    5.916807]  ? ip6_input_finish+0x8/0x8
[    5.916807]  ? ip6_output+0x6f/0x110
[    5.916808]  ? __ip6_local_out.cfi_jt+0x8/0x8
[    5.916810]  ? mld_sendpack+0x28e/0x330
[    5.916811]  ? ip_rt_bug+0x8/0x8
[    5.916813]  ? mld_ifc_timer_expire+0x2db/0x400
[    5.916814]  ? neigh_proxy_process+0x8/0x8
[    5.916816]  ? call_timer_fn+0x3d/0xd0
[    5.916817]  ? __run_timers+0x2a9/0x300
[    5.916819]  ? rcu_core_si+0x8/0x8
[    5.916820]  ? run_timer_softirq+0x14/0x30
[    5.916821]  ? __do_softirq+0x154/0x262
[    5.916822]  ? native_x2apic_icr_write+0x8/0x8
[    5.916824]  ? irq_exit+0xba/0xc0
[    5.916825]  ? hv_stimer0_vector_handler+0x99/0xe0
[    5.916826]  ? hv_stimer0_callback_vector+0xf/0x20
[    5.916826]  </IRQ>
[    5.916828]  ? hv_stimer_global_cleanup.cfi_jt+0x8/0x8
[    5.916829]  ? raw_setsockopt+0x8/0x8
[    5.916830]  ? default_idle+0xe/0x10
[    5.916832]  ? do_idle.llvm.10446269078108580492+0xb7/0x130
[    5.916833]  ? raw_setsockopt+0x8/0x8
[    5.916833]  ? cpu_startup_entry+0x15/0x20
[    5.916835]  ? cpu_hotplug_enable.cfi_jt+0x8/0x8
[    5.916836]  ? start_secondary+0x188/0x190
[    5.916837]  ? secondary_startup_64+0xa5/0xb0
[    5.916838] ---[ end trace f2683fa869597ba5 ]---

Avoid this by using the right return type for netvsc_start_xmit.

Fixes: fceaf24a943d8 ("Staging: hv: add the Hyper-V virtual network driver")
Link: https://github.com/ClangBuiltLinux/linux/issues/1009
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/hyperv/netvsc_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 2c0a24c606fc7..28a5d46ad5266 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -710,7 +710,8 @@ static int netvsc_xmit(struct sk_buff *skb, struct net_device *net, bool xdp_tx)
 	goto drop;
 }
 
-static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *ndev)
+static netdev_tx_t netvsc_start_xmit(struct sk_buff *skb,
+				     struct net_device *ndev)
 {
 	return netvsc_xmit(skb, ndev, false);
 }
-- 
2.20.1

[PATCH AUTOSEL 5.6 30/62] net: Make PTP-specific drivers depend on PTP_1588_CLOCK

[Sasha Levin]

From: Clay McClure <clay@daemons.net>

[ Upstream commit b6d49cab44b567b3e0a5544b3d61e516a7355fad ]

Commit d1cbfd771ce8 ("ptp_clock: Allow for it to be optional") changed
all PTP-capable Ethernet drivers from `select PTP_1588_CLOCK` to `imply
PTP_1588_CLOCK`, "in order to break the hard dependency between the PTP
clock subsystem and ethernet drivers capable of being clock providers."
As a result it is possible to build PTP-capable Ethernet drivers without
the PTP subsystem by deselecting PTP_1588_CLOCK. Drivers are required to
handle the missing dependency gracefully.

Some PTP-capable Ethernet drivers (e.g., TI_CPSW) factor their PTP code
out into separate drivers (e.g., TI_CPTS_MOD). The above commit also
changed these PTP-specific drivers to `imply PTP_1588_CLOCK`, making it
possible to build them without the PTP subsystem. But as Grygorii
Strashko noted in [1]:

On Wed, Apr 22, 2020 at 02:16:11PM +0300, Grygorii Strashko wrote:

> Another question is that CPTS completely nonfunctional in this case and
> it was never expected that somebody will even try to use/run such
> configuration (except for random build purposes).

In my view, enabling a PTP-specific driver without the PTP subsystem is
a configuration error made possible by the above commit. Kconfig should
not allow users to create a configuration with missing dependencies that
results in "completely nonfunctional" drivers.

I audited all network drivers that call ptp_clock_register() but merely
`imply PTP_1588_CLOCK` and found five PTP-specific drivers that are
likely nonfunctional without PTP_1588_CLOCK:

    NET_DSA_MV88E6XXX_PTP
    NET_DSA_SJA1105_PTP
    MACB_USE_HWSTAMP
    CAVIUM_PTP
    TI_CPTS_MOD

Note how these symbols all reference PTP or timestamping in their name;
this is a clue that they depend on PTP_1588_CLOCK.

Change them from `imply PTP_1588_CLOCK` [2] to `depends on PTP_1588_CLOCK`.
I'm not using `select PTP_1588_CLOCK` here because PTP_1588_CLOCK has
its own dependencies, which `select` would not transitively apply.

Additionally, remove the `select NET_PTP_CLASSIFY` from CPTS_TI_MOD;
PTP_1588_CLOCK already selects that.

[1]: https://lore.kernel.org/lkml/c04458ed-29ee-1797-3a11-7f3f560553e6@ti.com/

[2]: NET_DSA_SJA1105_PTP had never declared any type of dependency on
PTP_1588_CLOCK (`imply` or otherwise); adding a `depends on PTP_1588_CLOCK`
here seems appropriate.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Nicolas Pitre <nico@fluxnic.net>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: d1cbfd771ce8 ("ptp_clock: Allow for it to be optional")
Signed-off-by: Clay McClure <clay@daemons.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/dsa/mv88e6xxx/Kconfig    | 2 +-
 drivers/net/dsa/sja1105/Kconfig      | 1 +
 drivers/net/ethernet/cadence/Kconfig | 2 +-
 drivers/net/ethernet/cavium/Kconfig  | 2 +-
 drivers/net/ethernet/ti/Kconfig      | 3 +--
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/Kconfig b/drivers/net/dsa/mv88e6xxx/Kconfig
index 6435020d690dd..51185e4d7d15e 100644
--- a/drivers/net/dsa/mv88e6xxx/Kconfig
+++ b/drivers/net/dsa/mv88e6xxx/Kconfig
@@ -24,8 +24,8 @@ config NET_DSA_MV88E6XXX_PTP
 	bool "PTP support for Marvell 88E6xxx"
 	default n
 	depends on NET_DSA_MV88E6XXX_GLOBAL2
+	depends on PTP_1588_CLOCK
 	imply NETWORK_PHY_TIMESTAMPING
-	imply PTP_1588_CLOCK
 	help
 	  Say Y to enable PTP hardware timestamping on Marvell 88E6xxx switch
 	  chips that support it.
diff --git a/drivers/net/dsa/sja1105/Kconfig b/drivers/net/dsa/sja1105/Kconfig
index 0fe1ae173aa1a..68c3086af9af8 100644
--- a/drivers/net/dsa/sja1105/Kconfig
+++ b/drivers/net/dsa/sja1105/Kconfig
@@ -20,6 +20,7 @@ tristate "NXP SJA1105 Ethernet switch family support"
 config NET_DSA_SJA1105_PTP
 	bool "Support for the PTP clock on the NXP SJA1105 Ethernet switch"
 	depends on NET_DSA_SJA1105
+	depends on PTP_1588_CLOCK
 	help
 	  This enables support for timestamping and PTP clock manipulations in
 	  the SJA1105 DSA driver.
diff --git a/drivers/net/ethernet/cadence/Kconfig b/drivers/net/ethernet/cadence/Kconfig
index 53b50c24d9c95..2c4c12b03502d 100644
--- a/drivers/net/ethernet/cadence/Kconfig
+++ b/drivers/net/ethernet/cadence/Kconfig
@@ -35,8 +35,8 @@ config MACB
 config MACB_USE_HWSTAMP
 	bool "Use IEEE 1588 hwstamp"
 	depends on MACB
+	depends on PTP_1588_CLOCK
 	default y
-	imply PTP_1588_CLOCK
 	---help---
 	  Enable IEEE 1588 Precision Time Protocol (PTP) support for MACB.
 
diff --git a/drivers/net/ethernet/cavium/Kconfig b/drivers/net/ethernet/cavium/Kconfig
index 6a700d34019e3..4520e7ee00fe1 100644
--- a/drivers/net/ethernet/cavium/Kconfig
+++ b/drivers/net/ethernet/cavium/Kconfig
@@ -54,7 +54,7 @@ config	THUNDER_NIC_RGX
 config CAVIUM_PTP
 	tristate "Cavium PTP coprocessor as PTP clock"
 	depends on 64BIT && PCI
-	imply PTP_1588_CLOCK
+	depends on PTP_1588_CLOCK
 	---help---
 	  This driver adds support for the Precision Time Protocol Clocks and
 	  Timestamping coprocessor (PTP) found on Cavium processors.
diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index bf98e0fa7d8be..cd6eda83e1f8c 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -89,9 +89,8 @@ config TI_CPTS
 config TI_CPTS_MOD
 	tristate
 	depends on TI_CPTS
+	depends on PTP_1588_CLOCK
 	default y if TI_CPSW=y || TI_KEYSTONE_NETCP=y || TI_CPSW_SWITCHDEV=y
-	select NET_PTP_CLASSIFY
-	imply PTP_1588_CLOCK
 	default m
 
 config TI_KEYSTONE_NETCP
-- 
2.20.1

Re: [PATCH AUTOSEL 5.6 30/62] net: Make PTP-specific drivers depend on PTP_1588_CLOCK

[Arnd Bergmann]

On Thu, May 14, 2020 at 8:52 PM Sasha Levin <sashal@kernel.org> wrote:
>
> From: Clay McClure <clay@daemons.net>
>
> [ Upstream commit b6d49cab44b567b3e0a5544b3d61e516a7355fad ]
>
> Commit d1cbfd771ce8 ("ptp_clock: Allow for it to be optional") changed
> all PTP-capable Ethernet drivers from `select PTP_1588_CLOCK` to `imply
> PTP_1588_CLOCK`, "in order to break the hard dependency between the PTP
> clock subsystem and ethernet drivers capable of being clock providers."

I don't think this one should be backported unless 3a9dd3ecb207 ("kconfig:
make 'imply' obey the direct dependency") is already backported to v5.6
(which I don't think it should either).

       Arnd

Re: [PATCH AUTOSEL 5.6 30/62] net: Make PTP-specific drivers depend on PTP_1588_CLOCK

[Grygorii Strashko]

On 15/05/2020 00:40, Arnd Bergmann wrote:
> On Thu, May 14, 2020 at 8:52 PM Sasha Levin <sashal@kernel.org> wrote:
>>
>> From: Clay McClure <clay@daemons.net>
>>
>> [ Upstream commit b6d49cab44b567b3e0a5544b3d61e516a7355fad ]
>>
>> Commit d1cbfd771ce8 ("ptp_clock: Allow for it to be optional") changed
>> all PTP-capable Ethernet drivers from `select PTP_1588_CLOCK` to `imply
>> PTP_1588_CLOCK`, "in order to break the hard dependency between the PTP
>> clock subsystem and ethernet drivers capable of being clock providers."
> 
> I don't think this one should be backported unless 3a9dd3ecb207 ("kconfig:
> make 'imply' obey the direct dependency") is already backported to v5.6
> (which I don't think it should either).
> 
Yes. pls, drop it. It's rather optimization, not a fix.
And it might introduce build failures.

-- 
Best regards,
grygorii

[PATCH AUTOSEL 5.6 31/62] gtp: set NLM_F_MULTI flag in gtp_genl_dump_pdp()

[Sasha Levin]

From: Yoshiyuki Kurauchi <ahochauwaaaaa@gmail.com>

[ Upstream commit 846c68f7f1ac82c797a2f1db3344a2966c0fe2e1 ]

In drivers/net/gtp.c, gtp_genl_dump_pdp() should set NLM_F_MULTI
flag since it returns multipart message.
This patch adds a new arg "flags" in gtp_genl_fill_info() so that
flags can be set by the callers.

Signed-off-by: Yoshiyuki Kurauchi <ahochauwaaaaa@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/gtp.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 672cd2caf2fbe..21640a035d7df 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1169,11 +1169,11 @@ static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
 static struct genl_family gtp_genl_family;
 
 static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
-			      u32 type, struct pdp_ctx *pctx)
+			      int flags, u32 type, struct pdp_ctx *pctx)
 {
 	void *genlh;
 
-	genlh = genlmsg_put(skb, snd_portid, snd_seq, &gtp_genl_family, 0,
+	genlh = genlmsg_put(skb, snd_portid, snd_seq, &gtp_genl_family, flags,
 			    type);
 	if (genlh == NULL)
 		goto nlmsg_failure;
@@ -1227,8 +1227,8 @@ static int gtp_genl_get_pdp(struct sk_buff *skb, struct genl_info *info)
 		goto err_unlock;
 	}
 
-	err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid,
-				 info->snd_seq, info->nlhdr->nlmsg_type, pctx);
+	err = gtp_genl_fill_info(skb2, NETLINK_CB(skb).portid, info->snd_seq,
+				 0, info->nlhdr->nlmsg_type, pctx);
 	if (err < 0)
 		goto err_unlock_free;
 
@@ -1271,6 +1271,7 @@ static int gtp_genl_dump_pdp(struct sk_buff *skb,
 				    gtp_genl_fill_info(skb,
 					    NETLINK_CB(cb->skb).portid,
 					    cb->nlh->nlmsg_seq,
+					    NLM_F_MULTI,
 					    cb->nlh->nlmsg_type, pctx)) {
 					cb->args[0] = i;
 					cb->args[1] = j;
-- 
2.20.1

[PATCH AUTOSEL 5.6 32/62] virtio-blk: handle block_device_operations callbacks after hot unplug

[Sasha Levin]

From: Stefan Hajnoczi <stefanha@redhat.com>

[ Upstream commit 90b5feb8c4bebc76c27fcaf3e1a0e5ca2d319e9e ]

A userspace process holding a file descriptor to a virtio_blk device can
still invoke block_device_operations after hot unplug.  This leads to a
use-after-free accessing vblk->vdev in virtblk_getgeo() when
ioctl(HDIO_GETGEO) is invoked:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [<ffffffffc00e5450>] virtio_check_driver_offered_feature+0x10/0x90 [virtio]
  PGD 800000003a92f067 PUD 3a930067 PMD 0
  Oops: 0000 [#1] SMP
  CPU: 0 PID: 1310 Comm: hdio-getgeo Tainted: G           OE  ------------   3.10.0-1062.el7.x86_64 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  task: ffff9be5fbfb8000 ti: ffff9be5fa890000 task.ti: ffff9be5fa890000
  RIP: 0010:[<ffffffffc00e5450>]  [<ffffffffc00e5450>] virtio_check_driver_offered_feature+0x10/0x90 [virtio]
  RSP: 0018:ffff9be5fa893dc8  EFLAGS: 00010246
  RAX: ffff9be5fc3f3400 RBX: ffff9be5fa893e30 RCX: 0000000000000000
  RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff9be5fbc10b40
  RBP: ffff9be5fa893dc8 R08: 0000000000000301 R09: 0000000000000301
  R10: 0000000000000000 R11: 0000000000000000 R12: ffff9be5fdc24680
  R13: ffff9be5fbc10b40 R14: ffff9be5fbc10480 R15: 0000000000000000
  FS:  00007f1bfb968740(0000) GS:ffff9be5ffc00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000090 CR3: 000000003a894000 CR4: 0000000000360ff0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   [<ffffffffc016ac37>] virtblk_getgeo+0x47/0x110 [virtio_blk]
   [<ffffffff8d3f200d>] ? handle_mm_fault+0x39d/0x9b0
   [<ffffffff8d561265>] blkdev_ioctl+0x1f5/0xa20
   [<ffffffff8d488771>] block_ioctl+0x41/0x50
   [<ffffffff8d45d9e0>] do_vfs_ioctl+0x3a0/0x5a0
   [<ffffffff8d45dc81>] SyS_ioctl+0xa1/0xc0

A related problem is that virtblk_remove() leaks the vd_index_ida index
when something still holds a reference to vblk->disk during hot unplug.
This causes virtio-blk device names to be lost (vda, vdb, etc).

Fix these issues by protecting vblk->vdev with a mutex and reference
counting vblk so the vd_index_ida index can be removed in all cases.

Fixes: 48e4043d4529 ("virtio: add virtio disk geometry feature")
Reported-by: Lance Digby <ldigby@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20200430140442.171016-1-stefanha@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/block/virtio_blk.c | 86 ++++++++++++++++++++++++++++++++++----
 1 file changed, 78 insertions(+), 8 deletions(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 0736248999b0d..d52f33881ab6e 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -32,6 +32,15 @@ struct virtio_blk_vq {
 } ____cacheline_aligned_in_smp;
 
 struct virtio_blk {
+	/*
+	 * This mutex must be held by anything that may run after
+	 * virtblk_remove() sets vblk->vdev to NULL.
+	 *
+	 * blk-mq, virtqueue processing, and sysfs attribute code paths are
+	 * shut down before vblk->vdev is set to NULL and therefore do not need
+	 * to hold this mutex.
+	 */
+	struct mutex vdev_mutex;
 	struct virtio_device *vdev;
 
 	/* The disk structure for the kernel. */
@@ -43,6 +52,13 @@ struct virtio_blk {
 	/* Process context for config space updates */
 	struct work_struct config_work;
 
+	/*
+	 * Tracks references from block_device_operations open/release and
+	 * virtio_driver probe/remove so this object can be freed once no
+	 * longer in use.
+	 */
+	refcount_t refs;
+
 	/* What host tells us, plus 2 for header & tailer. */
 	unsigned int sg_elems;
 
@@ -294,10 +310,55 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
 	return err;
 }
 
+static void virtblk_get(struct virtio_blk *vblk)
+{
+	refcount_inc(&vblk->refs);
+}
+
+static void virtblk_put(struct virtio_blk *vblk)
+{
+	if (refcount_dec_and_test(&vblk->refs)) {
+		ida_simple_remove(&vd_index_ida, vblk->index);
+		mutex_destroy(&vblk->vdev_mutex);
+		kfree(vblk);
+	}
+}
+
+static int virtblk_open(struct block_device *bd, fmode_t mode)
+{
+	struct virtio_blk *vblk = bd->bd_disk->private_data;
+	int ret = 0;
+
+	mutex_lock(&vblk->vdev_mutex);
+
+	if (vblk->vdev)
+		virtblk_get(vblk);
+	else
+		ret = -ENXIO;
+
+	mutex_unlock(&vblk->vdev_mutex);
+	return ret;
+}
+
+static void virtblk_release(struct gendisk *disk, fmode_t mode)
+{
+	struct virtio_blk *vblk = disk->private_data;
+
+	virtblk_put(vblk);
+}
+
 /* We provide getgeo only to please some old bootloader/partitioning tools */
 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 {
 	struct virtio_blk *vblk = bd->bd_disk->private_data;
+	int ret = 0;
+
+	mutex_lock(&vblk->vdev_mutex);
+
+	if (!vblk->vdev) {
+		ret = -ENXIO;
+		goto out;
+	}
 
 	/* see if the host passed in geometry config */
 	if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
@@ -313,11 +374,15 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 		geo->sectors = 1 << 5;
 		geo->cylinders = get_capacity(bd->bd_disk) >> 11;
 	}
-	return 0;
+out:
+	mutex_unlock(&vblk->vdev_mutex);
+	return ret;
 }
 
 static const struct block_device_operations virtblk_fops = {
 	.owner  = THIS_MODULE,
+	.open = virtblk_open,
+	.release = virtblk_release,
 	.getgeo = virtblk_getgeo,
 };
 
@@ -657,6 +722,10 @@ static int virtblk_probe(struct virtio_device *vdev)
 		goto out_free_index;
 	}
 
+	/* This reference is dropped in virtblk_remove(). */
+	refcount_set(&vblk->refs, 1);
+	mutex_init(&vblk->vdev_mutex);
+
 	vblk->vdev = vdev;
 	vblk->sg_elems = sg_elems;
 
@@ -822,8 +891,6 @@ static int virtblk_probe(struct virtio_device *vdev)
 static void virtblk_remove(struct virtio_device *vdev)
 {
 	struct virtio_blk *vblk = vdev->priv;
-	int index = vblk->index;
-	int refc;
 
 	/* Make sure no work handler is accessing the device. */
 	flush_work(&vblk->config_work);
@@ -833,18 +900,21 @@ static void virtblk_remove(struct virtio_device *vdev)
 
 	blk_mq_free_tag_set(&vblk->tag_set);
 
+	mutex_lock(&vblk->vdev_mutex);
+
 	/* Stop all the virtqueues. */
 	vdev->config->reset(vdev);
 
-	refc = kref_read(&disk_to_dev(vblk->disk)->kobj.kref);
+	/* Virtqueues are stopped, nothing can use vblk->vdev anymore. */
+	vblk->vdev = NULL;
+
 	put_disk(vblk->disk);
 	vdev->config->del_vqs(vdev);
 	kfree(vblk->vqs);
-	kfree(vblk);
 
-	/* Only free device id if we don't have any users */
-	if (refc == 1)
-		ida_simple_remove(&vd_index_ida, index);
+	mutex_unlock(&vblk->vdev_mutex);
+
+	virtblk_put(vblk);
 }
 
 #ifdef CONFIG_PM_SLEEP
-- 
2.20.1

[PATCH AUTOSEL 5.6 32/62] virtio-blk: handle block_device_operations callbacks after hot unplug

[Sasha Levin]

From: Stefan Hajnoczi <stefanha@redhat.com>

[ Upstream commit 90b5feb8c4bebc76c27fcaf3e1a0e5ca2d319e9e ]

A userspace process holding a file descriptor to a virtio_blk device can
still invoke block_device_operations after hot unplug.  This leads to a
use-after-free accessing vblk->vdev in virtblk_getgeo() when
ioctl(HDIO_GETGEO) is invoked:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [<ffffffffc00e5450>] virtio_check_driver_offered_feature+0x10/0x90 [virtio]
  PGD 800000003a92f067 PUD 3a930067 PMD 0
  Oops: 0000 [#1] SMP
  CPU: 0 PID: 1310 Comm: hdio-getgeo Tainted: G           OE  ------------   3.10.0-1062.el7.x86_64 #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
  task: ffff9be5fbfb8000 ti: ffff9be5fa890000 task.ti: ffff9be5fa890000
  RIP: 0010:[<ffffffffc00e5450>]  [<ffffffffc00e5450>] virtio_check_driver_offered_feature+0x10/0x90 [virtio]
  RSP: 0018:ffff9be5fa893dc8  EFLAGS: 00010246
  RAX: ffff9be5fc3f3400 RBX: ffff9be5fa893e30 RCX: 0000000000000000
  RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff9be5fbc10b40
  RBP: ffff9be5fa893dc8 R08: 0000000000000301 R09: 0000000000000301
  R10: 0000000000000000 R11: 0000000000000000 R12: ffff9be5fdc24680
  R13: ffff9be5fbc10b40 R14: ffff9be5fbc10480 R15: 0000000000000000
  FS:  00007f1bfb968740(0000) GS:ffff9be5ffc00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000090 CR3: 000000003a894000 CR4: 0000000000360ff0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   [<ffffffffc016ac37>] virtblk_getgeo+0x47/0x110 [virtio_blk]
   [<ffffffff8d3f200d>] ? handle_mm_fault+0x39d/0x9b0
   [<ffffffff8d561265>] blkdev_ioctl+0x1f5/0xa20
   [<ffffffff8d488771>] block_ioctl+0x41/0x50
   [<ffffffff8d45d9e0>] do_vfs_ioctl+0x3a0/0x5a0
   [<ffffffff8d45dc81>] SyS_ioctl+0xa1/0xc0

A related problem is that virtblk_remove() leaks the vd_index_ida index
when something still holds a reference to vblk->disk during hot unplug.
This causes virtio-blk device names to be lost (vda, vdb, etc).

Fix these issues by protecting vblk->vdev with a mutex and reference
counting vblk so the vd_index_ida index can be removed in all cases.

Fixes: 48e4043d4529 ("virtio: add virtio disk geometry feature")
Reported-by: Lance Digby <ldigby@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Link: https://lore.kernel.org/r/20200430140442.171016-1-stefanha@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/block/virtio_blk.c | 86 ++++++++++++++++++++++++++++++++++----
 1 file changed, 78 insertions(+), 8 deletions(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 0736248999b0d..d52f33881ab6e 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -32,6 +32,15 @@ struct virtio_blk_vq {
 } ____cacheline_aligned_in_smp;
 
 struct virtio_blk {
+	/*
+	 * This mutex must be held by anything that may run after
+	 * virtblk_remove() sets vblk->vdev to NULL.
+	 *
+	 * blk-mq, virtqueue processing, and sysfs attribute code paths are
+	 * shut down before vblk->vdev is set to NULL and therefore do not need
+	 * to hold this mutex.
+	 */
+	struct mutex vdev_mutex;
 	struct virtio_device *vdev;
 
 	/* The disk structure for the kernel. */
@@ -43,6 +52,13 @@ struct virtio_blk {
 	/* Process context for config space updates */
 	struct work_struct config_work;
 
+	/*
+	 * Tracks references from block_device_operations open/release and
+	 * virtio_driver probe/remove so this object can be freed once no
+	 * longer in use.
+	 */
+	refcount_t refs;
+
 	/* What host tells us, plus 2 for header & tailer. */
 	unsigned int sg_elems;
 
@@ -294,10 +310,55 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
 	return err;
 }
 
+static void virtblk_get(struct virtio_blk *vblk)
+{
+	refcount_inc(&vblk->refs);
+}
+
+static void virtblk_put(struct virtio_blk *vblk)
+{
+	if (refcount_dec_and_test(&vblk->refs)) {
+		ida_simple_remove(&vd_index_ida, vblk->index);
+		mutex_destroy(&vblk->vdev_mutex);
+		kfree(vblk);
+	}
+}
+
+static int virtblk_open(struct block_device *bd, fmode_t mode)
+{
+	struct virtio_blk *vblk = bd->bd_disk->private_data;
+	int ret = 0;
+
+	mutex_lock(&vblk->vdev_mutex);
+
+	if (vblk->vdev)
+		virtblk_get(vblk);
+	else
+		ret = -ENXIO;
+
+	mutex_unlock(&vblk->vdev_mutex);
+	return ret;
+}
+
+static void virtblk_release(struct gendisk *disk, fmode_t mode)
+{
+	struct virtio_blk *vblk = disk->private_data;
+
+	virtblk_put(vblk);
+}
+
 /* We provide getgeo only to please some old bootloader/partitioning tools */
 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 {
 	struct virtio_blk *vblk = bd->bd_disk->private_data;
+	int ret = 0;
+
+	mutex_lock(&vblk->vdev_mutex);
+
+	if (!vblk->vdev) {
+		ret = -ENXIO;
+		goto out;
+	}
 
 	/* see if the host passed in geometry config */
 	if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
@@ -313,11 +374,15 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
 		geo->sectors = 1 << 5;
 		geo->cylinders = get_capacity(bd->bd_disk) >> 11;
 	}
-	return 0;
+out:
+	mutex_unlock(&vblk->vdev_mutex);
+	return ret;
 }
 
 static const struct block_device_operations virtblk_fops = {
 	.owner  = THIS_MODULE,
+	.open = virtblk_open,
+	.release = virtblk_release,
 	.getgeo = virtblk_getgeo,
 };
 
@@ -657,6 +722,10 @@ static int virtblk_probe(struct virtio_device *vdev)
 		goto out_free_index;
 	}
 
+	/* This reference is dropped in virtblk_remove(). */
+	refcount_set(&vblk->refs, 1);
+	mutex_init(&vblk->vdev_mutex);
+
 	vblk->vdev = vdev;
 	vblk->sg_elems = sg_elems;
 
@@ -822,8 +891,6 @@ static int virtblk_probe(struct virtio_device *vdev)
 static void virtblk_remove(struct virtio_device *vdev)
 {
 	struct virtio_blk *vblk = vdev->priv;
-	int index = vblk->index;
-	int refc;
 
 	/* Make sure no work handler is accessing the device. */
 	flush_work(&vblk->config_work);
@@ -833,18 +900,21 @@ static void virtblk_remove(struct virtio_device *vdev)
 
 	blk_mq_free_tag_set(&vblk->tag_set);
 
+	mutex_lock(&vblk->vdev_mutex);
+
 	/* Stop all the virtqueues. */
 	vdev->config->reset(vdev);
 
-	refc = kref_read(&disk_to_dev(vblk->disk)->kobj.kref);
+	/* Virtqueues are stopped, nothing can use vblk->vdev anymore. */
+	vblk->vdev = NULL;
+
 	put_disk(vblk->disk);
 	vdev->config->del_vqs(vdev);
 	kfree(vblk->vqs);
-	kfree(vblk);
 
-	/* Only free device id if we don't have any users */
-	if (refc == 1)
-		ida_simple_remove(&vd_index_ida, index);
+	mutex_unlock(&vblk->vdev_mutex);
+
+	virtblk_put(vblk);
 }
 
 #ifdef CONFIG_PM_SLEEP
-- 
2.20.1

[PATCH AUTOSEL 5.6 33/62] HID: quirks: Add HID_QUIRK_NO_INIT_REPORTS quirk for Dell K12A keyboard-dock

[Sasha Levin]

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 1e189f267015a098bdcb82cc652d13fbf2203fa0 ]

Add a HID_QUIRK_NO_INIT_REPORTS quirk for the Dell K12A keyboard-dock,
which can be used with various Dell Venue 11 models.

Without this quirk the keyboard/touchpad combo works fine when connected
at boot, but when hotplugged 9 out of 10 times it will not work properly.
Adding the quirk fixes this.

Cc: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-ids.h    | 1 +
 drivers/hid/hid-quirks.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 55afc089cb257..b1d6156ebf9d6 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -1111,6 +1111,7 @@
 #define USB_DEVICE_ID_SYNAPTICS_LTS2	0x1d10
 #define USB_DEVICE_ID_SYNAPTICS_HD	0x0ac3
 #define USB_DEVICE_ID_SYNAPTICS_QUAD_HD	0x1ac3
+#define USB_DEVICE_ID_SYNAPTICS_DELL_K12A	0x2819
 #define USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5_012	0x2968
 #define USB_DEVICE_ID_SYNAPTICS_TP_V103	0x5710
 #define USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5	0x81a7
diff --git a/drivers/hid/hid-quirks.c b/drivers/hid/hid-quirks.c
index 3735546bb524b..acc7c14f7fbc2 100644
--- a/drivers/hid/hid-quirks.c
+++ b/drivers/hid/hid-quirks.c
@@ -163,6 +163,7 @@ static const struct hid_device_id hid_quirks[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_LTS2), HID_QUIRK_NO_INIT_REPORTS },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_QUAD_HD), HID_QUIRK_NO_INIT_REPORTS },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_TP_V103), HID_QUIRK_NO_INIT_REPORTS },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_DELL_K12A), HID_QUIRK_NO_INIT_REPORTS },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPMAX, USB_DEVICE_ID_TOPMAX_COBRAPAD), HID_QUIRK_BADPAD },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_TOUCHPACK, USB_DEVICE_ID_TOUCHPACK_RTS), HID_QUIRK_MULTI_INPUT },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_TPV, USB_DEVICE_ID_TPV_OPTICAL_TOUCHSCREEN_8882), HID_QUIRK_NOGET },
-- 
2.20.1

[PATCH AUTOSEL 5.6 34/62] sun6i: dsi: fix gcc-4.8

[Sasha Levin]

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 3a3a71f97c30983f1627c2c550d43566e9b634d2 ]

Older compilers warn about initializers with incorrect curly
braces:

drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c: In function 'sun6i_dsi_encoder_enable':
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:720:8: error: missing braces around initializer [-Werror=missing-braces]
  union phy_configure_opts opts = { 0 };
        ^
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:720:8: error: (near initialization for 'opts.mipi_dphy') [-Werror=missing-braces]

Use the GNU empty initializer extension to avoid this.

Fixes: bb3b6fcb6849 ("sun6i: dsi: Convert to generic phy handling")
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200428215105.3928459-1-arnd@arndb.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index a75fcb1131724..2b6d77ca3dfc2 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -719,7 +719,7 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
 	struct mipi_dsi_device *device = dsi->device;
-	union phy_configure_opts opts = { 0 };
+	union phy_configure_opts opts = { };
 	struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
 	u16 delay;
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 34/62] sun6i: dsi: fix gcc-4.8

[Sasha Levin]

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 3a3a71f97c30983f1627c2c550d43566e9b634d2 ]

Older compilers warn about initializers with incorrect curly
braces:

drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c: In function 'sun6i_dsi_encoder_enable':
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:720:8: error: missing braces around initializer [-Werror=missing-braces]
  union phy_configure_opts opts = { 0 };
        ^
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:720:8: error: (near initialization for 'opts.mipi_dphy') [-Werror=missing-braces]

Use the GNU empty initializer extension to avoid this.

Fixes: bb3b6fcb6849 ("sun6i: dsi: Convert to generic phy handling")
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200428215105.3928459-1-arnd@arndb.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index a75fcb1131724..2b6d77ca3dfc2 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -719,7 +719,7 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
 	struct mipi_dsi_device *device = dsi->device;
-	union phy_configure_opts opts = { 0 };
+	union phy_configure_opts opts = { };
 	struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
 	u16 delay;
 
-- 
2.20.1

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[PATCH AUTOSEL 5.6 34/62] sun6i: dsi: fix gcc-4.8

[Sasha Levin]

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 3a3a71f97c30983f1627c2c550d43566e9b634d2 ]

Older compilers warn about initializers with incorrect curly
braces:

drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c: In function 'sun6i_dsi_encoder_enable':
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:720:8: error: missing braces around initializer [-Werror=missing-braces]
  union phy_configure_opts opts = { 0 };
        ^
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c:720:8: error: (near initialization for 'opts.mipi_dphy') [-Werror=missing-braces]

Use the GNU empty initializer extension to avoid this.

Fixes: bb3b6fcb6849 ("sun6i: dsi: Convert to generic phy handling")
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20200428215105.3928459-1-arnd@arndb.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index a75fcb1131724..2b6d77ca3dfc2 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -719,7 +719,7 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 	struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
 	struct mipi_dsi_device *device = dsi->device;
-	union phy_configure_opts opts = { 0 };
+	union phy_configure_opts opts = { };
 	struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
 	u16 delay;
 
-- 
2.20.1


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[PATCH AUTOSEL 5.6 35/62] ceph: fix double unlock in handle_cap_export()

[Sasha Levin]

From: Wu Bo <wubo40@huawei.com>

[ Upstream commit 4d8e28ff3106b093d98bfd2eceb9b430c70a8758 ]

If the ceph_mdsc_open_export_target_session() return fails, it will
do a "goto retry", but the session mutex has already been unlocked.
Re-lock the mutex in that case to ensure that we don't unlock it
twice.

Signed-off-by: Wu Bo <wubo40@huawei.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ceph/caps.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index d050acc1fd5d9..f50204380a65d 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3707,6 +3707,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
 		WARN_ON(1);
 		tsession = NULL;
 		target = -1;
+		mutex_lock(&session->s_mutex);
 	}
 	goto retry;
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 36/62] stmmac: fix pointer check after utilization in stmmac_interrupt

[Sasha Levin]

From: Maxim Petrov <mmrmaximuzz@gmail.com>

[ Upstream commit f42234ffd531ca6b13d9da02faa60b72eccf8334 ]

The paranoidal pointer check in IRQ handler looks very strange - it
really protects us only against bogus drivers which request IRQ line
with null pointer dev_id. However, the code fragment is incorrect
because the dev pointer is used before the actual check which leads
to undefined behavior. Remove the check to avoid confusing people
with incorrect code.

Signed-off-by: Maxim Petrov <mmrmaximuzz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7da18c9afa01d..d564459290ce1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3988,7 +3988,7 @@ static int stmmac_set_features(struct net_device *netdev,
 /**
  *  stmmac_interrupt - main ISR
  *  @irq: interrupt number.
- *  @dev_id: to pass the net device pointer.
+ *  @dev_id: to pass the net device pointer (must be valid).
  *  Description: this is the main driver interrupt service routine.
  *  It can call:
  *  o DMA service routine (to manage incoming frame reception and transmission
@@ -4012,11 +4012,6 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 	if (priv->irq_wake)
 		pm_wakeup_event(priv->device, 0);
 
-	if (unlikely(!dev)) {
-		netdev_err(priv->dev, "%s: invalid dev pointer\n", __func__);
-		return IRQ_NONE;
-	}
-
 	/* Check if adapter is up */
 	if (test_bit(STMMAC_DOWN, &priv->state))
 		return IRQ_HANDLED;
-- 
2.20.1

[PATCH AUTOSEL 5.6 36/62] stmmac: fix pointer check after utilization in stmmac_interrupt

[Sasha Levin]

From: Maxim Petrov <mmrmaximuzz@gmail.com>

[ Upstream commit f42234ffd531ca6b13d9da02faa60b72eccf8334 ]

The paranoidal pointer check in IRQ handler looks very strange - it
really protects us only against bogus drivers which request IRQ line
with null pointer dev_id. However, the code fragment is incorrect
because the dev pointer is used before the actual check which leads
to undefined behavior. Remove the check to avoid confusing people
with incorrect code.

Signed-off-by: Maxim Petrov <mmrmaximuzz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7da18c9afa01d..d564459290ce1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3988,7 +3988,7 @@ static int stmmac_set_features(struct net_device *netdev,
 /**
  *  stmmac_interrupt - main ISR
  *  @irq: interrupt number.
- *  @dev_id: to pass the net device pointer.
+ *  @dev_id: to pass the net device pointer (must be valid).
  *  Description: this is the main driver interrupt service routine.
  *  It can call:
  *  o DMA service routine (to manage incoming frame reception and transmission
@@ -4012,11 +4012,6 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 	if (priv->irq_wake)
 		pm_wakeup_event(priv->device, 0);
 
-	if (unlikely(!dev)) {
-		netdev_err(priv->dev, "%s: invalid dev pointer\n", __func__);
-		return IRQ_NONE;
-	}
-
 	/* Check if adapter is up */
 	if (test_bit(STMMAC_DOWN, &priv->state))
 		return IRQ_HANDLED;
-- 
2.20.1


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[PATCH AUTOSEL 5.6 37/62] net: stmmac: gmac5+: fix potential integer overflow on 32 bit multiply

[Sasha Levin]

From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit 44d95cc6b10ff7439d45839c96c581cb4368c088 ]

The multiplication of cfg->ctr[1] by 1000000000 is performed using a
32 bit multiplication (since cfg->ctr[1] is a u32) and this can lead
to a potential overflow. Fix this by making the constant a ULL to
ensure a 64 bit multiply occurs.

Fixes: 504723af0d85 ("net: stmmac: Add basic EST support for GMAC5+")
Addresses-Coverity: ("Unintentional integer overflow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac5.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac5.c b/drivers/net/ethernet/stmicro/stmmac/dwmac5.c
index 494c859b4ade8..67ba67ed0cb99 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac5.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac5.c
@@ -624,7 +624,7 @@ int dwmac5_est_configure(void __iomem *ioaddr, struct stmmac_est *cfg,
 		total_offset += offset;
 	}
 
-	total_ctr = cfg->ctr[0] + cfg->ctr[1] * 1000000000;
+	total_ctr = cfg->ctr[0] + cfg->ctr[1] * 1000000000ULL;
 	total_ctr += total_offset;
 
 	ctr_low = do_div(total_ctr, 1000000000);
-- 
2.20.1

[PATCH AUTOSEL 5.6 37/62] net: stmmac: gmac5+: fix potential integer overflow on 32 bit multiply

[Sasha Levin]

From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit 44d95cc6b10ff7439d45839c96c581cb4368c088 ]

The multiplication of cfg->ctr[1] by 1000000000 is performed using a
32 bit multiplication (since cfg->ctr[1] is a u32) and this can lead
to a potential overflow. Fix this by making the constant a ULL to
ensure a 64 bit multiply occurs.

Fixes: 504723af0d85 ("net: stmmac: Add basic EST support for GMAC5+")
Addresses-Coverity: ("Unintentional integer overflow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac5.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac5.c b/drivers/net/ethernet/stmicro/stmmac/dwmac5.c
index 494c859b4ade8..67ba67ed0cb99 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac5.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac5.c
@@ -624,7 +624,7 @@ int dwmac5_est_configure(void __iomem *ioaddr, struct stmmac_est *cfg,
 		total_offset += offset;
 	}
 
-	total_ctr = cfg->ctr[0] + cfg->ctr[1] * 1000000000;
+	total_ctr = cfg->ctr[0] + cfg->ctr[1] * 1000000000ULL;
 	total_ctr += total_offset;
 
 	ctr_low = do_div(total_ctr, 1000000000);
-- 
2.20.1


_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH AUTOSEL 5.6 38/62] USB: core: Fix misleading driver bug report

[Sasha Levin]

From: Alan Stern <stern@rowland.harvard.edu>

[ Upstream commit ac854131d9844f79e2fdcef67a7707227538d78a ]

The syzbot fuzzer found a race between URB submission to endpoint 0
and device reset.  Namely, during the reset we call usb_ep0_reinit()
because the characteristics of ep0 may have changed (if the reset
follows a firmware update, for example).  While usb_ep0_reinit() is
running there is a brief period during which the pointers stored in
udev->ep_in[0] and udev->ep_out[0] are set to NULL, and if an URB is
submitted to ep0 during that period, usb_urb_ep_type_check() will
report it as a driver bug.  In the absence of those pointers, the
routine thinks that the endpoint doesn't exist.  The log message looks
like this:

------------[ cut here ]------------
usb 2-1: BOGUS urb xfer, pipe 2 != type 2
WARNING: CPU: 0 PID: 9241 at drivers/usb/core/urb.c:478
usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478

Now, although submitting an URB while the device is being reset is a
questionable thing to do, it shouldn't count as a driver bug as severe
as submitting an URB for an endpoint that doesn't exist.  Indeed,
endpoint 0 always exists, even while the device is in its unconfigured
state.

To prevent these misleading driver bug reports, this patch updates
usb_disable_endpoint() to avoid clearing the ep_in[] and ep_out[]
pointers when the endpoint being disabled is ep0.  There's no danger
of leaving a stale pointer in place, because the usb_host_endpoint
structure being pointed to is stored permanently in udev->ep0; it
doesn't get deallocated until the entire usb_device structure does.

Reported-and-tested-by: syzbot+db339689b2101f6f6071@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>

Link: https://lore.kernel.org/r/Pine.LNX.4.44L0.2005011558590.903-100000@netrider.rowland.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/core/message.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 02eaac7e1e34e..a1ac2f0723b0b 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1143,11 +1143,11 @@ void usb_disable_endpoint(struct usb_device *dev, unsigned int epaddr,
 
 	if (usb_endpoint_out(epaddr)) {
 		ep = dev->ep_out[epnum];
-		if (reset_hardware)
+		if (reset_hardware && epnum != 0)
 			dev->ep_out[epnum] = NULL;
 	} else {
 		ep = dev->ep_in[epnum];
-		if (reset_hardware)
+		if (reset_hardware && epnum != 0)
 			dev->ep_in[epnum] = NULL;
 	}
 	if (ep) {
-- 
2.20.1

[PATCH AUTOSEL 5.6 39/62] platform/x86: asus-nb-wmi: Do not load on Asus T100TA and T200TA

[Sasha Levin]

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 3bd12da7f50b8bc191fcb3bab1f55c582234df59 ]

asus-nb-wmi does not add any extra functionality on these Asus
Transformer books. They have detachable keyboards, so the hotkeys are
send through a HID device (and handled by the hid-asus driver) and also
the rfkill functionality is not used on these devices.

Besides not adding any extra functionality, initializing the WMI interface
on these devices actually has a negative side-effect. For some reason
the \_SB.ATKD.INIT() function which asus_wmi_platform_init() calls drives
GPO2 (INT33FC:02) pin 8, which is connected to the front facing webcam LED,
high and there is no (WMI or other) interface to drive this low again
causing the LED to be permanently on, even during suspend.

This commit adds a blacklist of DMI system_ids on which not to load the
asus-nb-wmi and adds these Transformer books to this list. This fixes
the webcam LED being permanently on under Linux.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/platform/x86/asus-nb-wmi.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
index 6f12747a359a2..c4404d9c1de4f 100644
--- a/drivers/platform/x86/asus-nb-wmi.c
+++ b/drivers/platform/x86/asus-nb-wmi.c
@@ -515,9 +515,33 @@ static struct asus_wmi_driver asus_nb_wmi_driver = {
 	.detect_quirks = asus_nb_wmi_quirks,
 };
 
+static const struct dmi_system_id asus_nb_wmi_blacklist[] __initconst = {
+	{
+		/*
+		 * asus-nb-wm adds no functionality. The T100TA has a detachable
+		 * USB kbd, so no hotkeys and it has no WMI rfkill; and loading
+		 * asus-nb-wm causes the camera LED to turn and _stay_ on.
+		 */
+		.matches = {
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
+		},
+	},
+	{
+		/* The Asus T200TA has the same issue as the T100TA */
+		.matches = {
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
+		},
+	},
+	{} /* Terminating entry */
+};
 
 static int __init asus_nb_wmi_init(void)
 {
+	if (dmi_check_system(asus_nb_wmi_blacklist))
+		return -ENODEV;
+
 	return asus_wmi_register_driver(&asus_nb_wmi_driver);
 }
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 40/62] iommu/amd: Fix race in increase_address_space()/fetch_pte()

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit eb791aa70b90c559eeb371d807c8813d569393f0 ]

The 'pt_root' and 'mode' struct members of 'struct protection_domain'
need to be get/set atomically, otherwise the page-table of the domain
can get corrupted.

Merge the fields into one atomic64_t struct member which can be
get/set atomically.

Fixes: 92d420ec028d ("iommu/amd: Relax locking in dma_ops path")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-2-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c       | 140 ++++++++++++++++++++++++--------
 drivers/iommu/amd_iommu_types.h |   9 +-
 2 files changed, 112 insertions(+), 37 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 20cce366e9518..28229a38af4d2 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -151,6 +151,26 @@ static struct protection_domain *to_pdomain(struct iommu_domain *dom)
 	return container_of(dom, struct protection_domain, domain);
 }
 
+static void amd_iommu_domain_get_pgtable(struct protection_domain *domain,
+					 struct domain_pgtable *pgtable)
+{
+	u64 pt_root = atomic64_read(&domain->pt_root);
+
+	pgtable->root = (u64 *)(pt_root & PAGE_MASK);
+	pgtable->mode = pt_root & 7; /* lowest 3 bits encode pgtable mode */
+}
+
+static u64 amd_iommu_domain_encode_pgtable(u64 *root, int mode)
+{
+	u64 pt_root;
+
+	/* lowest 3 bits encode pgtable mode */
+	pt_root = mode & 7;
+	pt_root |= (u64)root;
+
+	return pt_root;
+}
+
 static struct iommu_dev_data *alloc_dev_data(u16 devid)
 {
 	struct iommu_dev_data *dev_data;
@@ -1397,13 +1417,18 @@ static struct page *free_sub_pt(unsigned long root, int mode,
 
 static void free_pagetable(struct protection_domain *domain)
 {
-	unsigned long root = (unsigned long)domain->pt_root;
+	struct domain_pgtable pgtable;
 	struct page *freelist = NULL;
+	unsigned long root;
+
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	atomic64_set(&domain->pt_root, 0);
 
-	BUG_ON(domain->mode < PAGE_MODE_NONE ||
-	       domain->mode > PAGE_MODE_6_LEVEL);
+	BUG_ON(pgtable.mode < PAGE_MODE_NONE ||
+	       pgtable.mode > PAGE_MODE_6_LEVEL);
 
-	freelist = free_sub_pt(root, domain->mode, freelist);
+	root = (unsigned long)pgtable.root;
+	freelist = free_sub_pt(root, pgtable.mode, freelist);
 
 	free_page_list(freelist);
 }
@@ -1417,24 +1442,28 @@ static bool increase_address_space(struct protection_domain *domain,
 				   unsigned long address,
 				   gfp_t gfp)
 {
+	struct domain_pgtable pgtable;
 	unsigned long flags;
 	bool ret = false;
-	u64 *pte;
+	u64 *pte, root;
 
 	spin_lock_irqsave(&domain->lock, flags);
 
-	if (address <= PM_LEVEL_SIZE(domain->mode) ||
-	    WARN_ON_ONCE(domain->mode == PAGE_MODE_6_LEVEL))
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	if (address <= PM_LEVEL_SIZE(pgtable.mode) ||
+	    WARN_ON_ONCE(pgtable.mode == PAGE_MODE_6_LEVEL))
 		goto out;
 
 	pte = (void *)get_zeroed_page(gfp);
 	if (!pte)
 		goto out;
 
-	*pte             = PM_LEVEL_PDE(domain->mode,
-					iommu_virt_to_phys(domain->pt_root));
-	domain->pt_root  = pte;
-	domain->mode    += 1;
+	*pte = PM_LEVEL_PDE(pgtable.mode, iommu_virt_to_phys(pgtable.root));
+
+	root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode + 1);
+
+	atomic64_set(&domain->pt_root, root);
 
 	ret = true;
 
@@ -1451,16 +1480,22 @@ static u64 *alloc_pte(struct protection_domain *domain,
 		      gfp_t gfp,
 		      bool *updated)
 {
+	struct domain_pgtable pgtable;
 	int level, end_lvl;
 	u64 *pte, *page;
 
 	BUG_ON(!is_power_of_2(page_size));
 
-	while (address > PM_LEVEL_SIZE(domain->mode))
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	while (address > PM_LEVEL_SIZE(pgtable.mode)) {
 		*updated = increase_address_space(domain, address, gfp) || *updated;
+		amd_iommu_domain_get_pgtable(domain, &pgtable);
+	}
+
 
-	level   = domain->mode - 1;
-	pte     = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
+	level   = pgtable.mode - 1;
+	pte     = &pgtable.root[PM_LEVEL_INDEX(level, address)];
 	address = PAGE_SIZE_ALIGN(address, page_size);
 	end_lvl = PAGE_SIZE_LEVEL(page_size);
 
@@ -1536,16 +1571,19 @@ static u64 *fetch_pte(struct protection_domain *domain,
 		      unsigned long address,
 		      unsigned long *page_size)
 {
+	struct domain_pgtable pgtable;
 	int level;
 	u64 *pte;
 
 	*page_size = 0;
 
-	if (address > PM_LEVEL_SIZE(domain->mode))
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	if (address > PM_LEVEL_SIZE(pgtable.mode))
 		return NULL;
 
-	level	   =  domain->mode - 1;
-	pte	   = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
+	level	   =  pgtable.mode - 1;
+	pte	   = &pgtable.root[PM_LEVEL_INDEX(level, address)];
 	*page_size =  PTE_LEVEL_PAGE_SIZE(level);
 
 	while (level > 0) {
@@ -1806,6 +1844,7 @@ static void dma_ops_domain_free(struct protection_domain *domain)
 static struct protection_domain *dma_ops_domain_alloc(void)
 {
 	struct protection_domain *domain;
+	u64 *pt_root, root;
 
 	domain = kzalloc(sizeof(struct protection_domain), GFP_KERNEL);
 	if (!domain)
@@ -1814,12 +1853,14 @@ static struct protection_domain *dma_ops_domain_alloc(void)
 	if (protection_domain_init(domain))
 		goto free_domain;
 
-	domain->mode = PAGE_MODE_3_LEVEL;
-	domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
-	domain->flags = PD_DMA_OPS_MASK;
-	if (!domain->pt_root)
+	pt_root = (void *)get_zeroed_page(GFP_KERNEL);
+	if (!pt_root)
 		goto free_domain;
 
+	root = amd_iommu_domain_encode_pgtable(pt_root, PAGE_MODE_3_LEVEL);
+	atomic64_set(&domain->pt_root, root);
+	domain->flags = PD_DMA_OPS_MASK;
+
 	if (iommu_get_dma_cookie(&domain->domain) == -ENOMEM)
 		goto free_domain;
 
@@ -1843,14 +1884,17 @@ static bool dma_ops_domain(struct protection_domain *domain)
 static void set_dte_entry(u16 devid, struct protection_domain *domain,
 			  bool ats, bool ppr)
 {
+	struct domain_pgtable pgtable;
 	u64 pte_root = 0;
 	u64 flags = 0;
 	u32 old_domid;
 
-	if (domain->mode != PAGE_MODE_NONE)
-		pte_root = iommu_virt_to_phys(domain->pt_root);
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	if (pgtable.mode != PAGE_MODE_NONE)
+		pte_root = iommu_virt_to_phys(pgtable.root);
 
-	pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
+	pte_root |= (pgtable.mode & DEV_ENTRY_MODE_MASK)
 		    << DEV_ENTRY_MODE_SHIFT;
 	pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV;
 
@@ -2375,6 +2419,7 @@ static struct protection_domain *protection_domain_alloc(void)
 static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 {
 	struct protection_domain *pdomain;
+	u64 *pt_root, root;
 
 	switch (type) {
 	case IOMMU_DOMAIN_UNMANAGED:
@@ -2382,13 +2427,15 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 		if (!pdomain)
 			return NULL;
 
-		pdomain->mode    = PAGE_MODE_3_LEVEL;
-		pdomain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
-		if (!pdomain->pt_root) {
+		pt_root = (void *)get_zeroed_page(GFP_KERNEL);
+		if (!pt_root) {
 			protection_domain_free(pdomain);
 			return NULL;
 		}
 
+		root = amd_iommu_domain_encode_pgtable(pt_root, PAGE_MODE_3_LEVEL);
+		atomic64_set(&pdomain->pt_root, root);
+
 		pdomain->domain.geometry.aperture_start = 0;
 		pdomain->domain.geometry.aperture_end   = ~0ULL;
 		pdomain->domain.geometry.force_aperture = true;
@@ -2406,7 +2453,7 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 		if (!pdomain)
 			return NULL;
 
-		pdomain->mode = PAGE_MODE_NONE;
+		atomic64_set(&pdomain->pt_root, PAGE_MODE_NONE);
 		break;
 	default:
 		return NULL;
@@ -2418,6 +2465,7 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 static void amd_iommu_domain_free(struct iommu_domain *dom)
 {
 	struct protection_domain *domain;
+	struct domain_pgtable pgtable;
 
 	domain = to_pdomain(dom);
 
@@ -2435,7 +2483,9 @@ static void amd_iommu_domain_free(struct iommu_domain *dom)
 		dma_ops_domain_free(domain);
 		break;
 	default:
-		if (domain->mode != PAGE_MODE_NONE)
+		amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+		if (pgtable.mode != PAGE_MODE_NONE)
 			free_pagetable(domain);
 
 		if (domain->flags & PD_IOMMUV2_MASK)
@@ -2518,10 +2568,12 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
 			 gfp_t gfp)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct domain_pgtable pgtable;
 	int prot = 0;
 	int ret;
 
-	if (domain->mode == PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode == PAGE_MODE_NONE)
 		return -EINVAL;
 
 	if (iommu_prot & IOMMU_READ)
@@ -2541,8 +2593,10 @@ static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
 			      struct iommu_iotlb_gather *gather)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct domain_pgtable pgtable;
 
-	if (domain->mode == PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode == PAGE_MODE_NONE)
 		return 0;
 
 	return iommu_unmap_page(domain, iova, page_size);
@@ -2553,9 +2607,11 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 {
 	struct protection_domain *domain = to_pdomain(dom);
 	unsigned long offset_mask, pte_pgsize;
+	struct domain_pgtable pgtable;
 	u64 *pte, __pte;
 
-	if (domain->mode == PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode == PAGE_MODE_NONE)
 		return iova;
 
 	pte = fetch_pte(domain, iova, &pte_pgsize);
@@ -2708,16 +2764,26 @@ EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
 void amd_iommu_domain_direct_map(struct iommu_domain *dom)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct domain_pgtable pgtable;
 	unsigned long flags;
+	u64 pt_root;
 
 	spin_lock_irqsave(&domain->lock, flags);
 
+	/* First save pgtable configuration*/
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
 	/* Update data structure */
-	domain->mode    = PAGE_MODE_NONE;
+	pt_root = amd_iommu_domain_encode_pgtable(NULL, PAGE_MODE_NONE);
+	atomic64_set(&domain->pt_root, pt_root);
 
 	/* Make changes visible to IOMMUs */
 	update_domain(domain);
 
+	/* Restore old pgtable in domain->ptroot to free page-table */
+	pt_root = amd_iommu_domain_encode_pgtable(pgtable.root, pgtable.mode);
+	atomic64_set(&domain->pt_root, pt_root);
+
 	/* Page-table is not visible to IOMMU anymore, so free it */
 	free_pagetable(domain);
 
@@ -2908,9 +2974,11 @@ static u64 *__get_gcr3_pte(u64 *root, int level, int pasid, bool alloc)
 static int __set_gcr3(struct protection_domain *domain, int pasid,
 		      unsigned long cr3)
 {
+	struct domain_pgtable pgtable;
 	u64 *pte;
 
-	if (domain->mode != PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode != PAGE_MODE_NONE)
 		return -EINVAL;
 
 	pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true);
@@ -2924,9 +2992,11 @@ static int __set_gcr3(struct protection_domain *domain, int pasid,
 
 static int __clear_gcr3(struct protection_domain *domain, int pasid)
 {
+	struct domain_pgtable pgtable;
 	u64 *pte;
 
-	if (domain->mode != PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode != PAGE_MODE_NONE)
 		return -EINVAL;
 
 	pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index ca8c4522045b3..7a8fdec138bd1 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -468,8 +468,7 @@ struct protection_domain {
 				       iommu core code */
 	spinlock_t lock;	/* mostly used to lock the page table*/
 	u16 id;			/* the domain id written to the device table */
-	int mode;		/* paging mode (0-6 levels) */
-	u64 *pt_root;		/* page table root pointer */
+	atomic64_t pt_root;	/* pgtable root and pgtable mode */
 	int glx;		/* Number of levels for GCR3 table */
 	u64 *gcr3_tbl;		/* Guest CR3 table */
 	unsigned long flags;	/* flags to find out type of domain */
@@ -477,6 +476,12 @@ struct protection_domain {
 	unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */
 };
 
+/* For decocded pt_root */
+struct domain_pgtable {
+	int mode;
+	u64 *root;
+};
+
 /*
  * Structure where we save information about one hardware AMD IOMMU in the
  * system.
-- 
2.20.1

[PATCH AUTOSEL 5.6 40/62] iommu/amd: Fix race in increase_address_space()/fetch_pte()

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit eb791aa70b90c559eeb371d807c8813d569393f0 ]

The 'pt_root' and 'mode' struct members of 'struct protection_domain'
need to be get/set atomically, otherwise the page-table of the domain
can get corrupted.

Merge the fields into one atomic64_t struct member which can be
get/set atomically.

Fixes: 92d420ec028d ("iommu/amd: Relax locking in dma_ops path")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-2-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c       | 140 ++++++++++++++++++++++++--------
 drivers/iommu/amd_iommu_types.h |   9 +-
 2 files changed, 112 insertions(+), 37 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 20cce366e9518..28229a38af4d2 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -151,6 +151,26 @@ static struct protection_domain *to_pdomain(struct iommu_domain *dom)
 	return container_of(dom, struct protection_domain, domain);
 }
 
+static void amd_iommu_domain_get_pgtable(struct protection_domain *domain,
+					 struct domain_pgtable *pgtable)
+{
+	u64 pt_root = atomic64_read(&domain->pt_root);
+
+	pgtable->root = (u64 *)(pt_root & PAGE_MASK);
+	pgtable->mode = pt_root & 7; /* lowest 3 bits encode pgtable mode */
+}
+
+static u64 amd_iommu_domain_encode_pgtable(u64 *root, int mode)
+{
+	u64 pt_root;
+
+	/* lowest 3 bits encode pgtable mode */
+	pt_root = mode & 7;
+	pt_root |= (u64)root;
+
+	return pt_root;
+}
+
 static struct iommu_dev_data *alloc_dev_data(u16 devid)
 {
 	struct iommu_dev_data *dev_data;
@@ -1397,13 +1417,18 @@ static struct page *free_sub_pt(unsigned long root, int mode,
 
 static void free_pagetable(struct protection_domain *domain)
 {
-	unsigned long root = (unsigned long)domain->pt_root;
+	struct domain_pgtable pgtable;
 	struct page *freelist = NULL;
+	unsigned long root;
+
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	atomic64_set(&domain->pt_root, 0);
 
-	BUG_ON(domain->mode < PAGE_MODE_NONE ||
-	       domain->mode > PAGE_MODE_6_LEVEL);
+	BUG_ON(pgtable.mode < PAGE_MODE_NONE ||
+	       pgtable.mode > PAGE_MODE_6_LEVEL);
 
-	freelist = free_sub_pt(root, domain->mode, freelist);
+	root = (unsigned long)pgtable.root;
+	freelist = free_sub_pt(root, pgtable.mode, freelist);
 
 	free_page_list(freelist);
 }
@@ -1417,24 +1442,28 @@ static bool increase_address_space(struct protection_domain *domain,
 				   unsigned long address,
 				   gfp_t gfp)
 {
+	struct domain_pgtable pgtable;
 	unsigned long flags;
 	bool ret = false;
-	u64 *pte;
+	u64 *pte, root;
 
 	spin_lock_irqsave(&domain->lock, flags);
 
-	if (address <= PM_LEVEL_SIZE(domain->mode) ||
-	    WARN_ON_ONCE(domain->mode == PAGE_MODE_6_LEVEL))
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	if (address <= PM_LEVEL_SIZE(pgtable.mode) ||
+	    WARN_ON_ONCE(pgtable.mode == PAGE_MODE_6_LEVEL))
 		goto out;
 
 	pte = (void *)get_zeroed_page(gfp);
 	if (!pte)
 		goto out;
 
-	*pte             = PM_LEVEL_PDE(domain->mode,
-					iommu_virt_to_phys(domain->pt_root));
-	domain->pt_root  = pte;
-	domain->mode    += 1;
+	*pte = PM_LEVEL_PDE(pgtable.mode, iommu_virt_to_phys(pgtable.root));
+
+	root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode + 1);
+
+	atomic64_set(&domain->pt_root, root);
 
 	ret = true;
 
@@ -1451,16 +1480,22 @@ static u64 *alloc_pte(struct protection_domain *domain,
 		      gfp_t gfp,
 		      bool *updated)
 {
+	struct domain_pgtable pgtable;
 	int level, end_lvl;
 	u64 *pte, *page;
 
 	BUG_ON(!is_power_of_2(page_size));
 
-	while (address > PM_LEVEL_SIZE(domain->mode))
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	while (address > PM_LEVEL_SIZE(pgtable.mode)) {
 		*updated = increase_address_space(domain, address, gfp) || *updated;
+		amd_iommu_domain_get_pgtable(domain, &pgtable);
+	}
+
 
-	level   = domain->mode - 1;
-	pte     = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
+	level   = pgtable.mode - 1;
+	pte     = &pgtable.root[PM_LEVEL_INDEX(level, address)];
 	address = PAGE_SIZE_ALIGN(address, page_size);
 	end_lvl = PAGE_SIZE_LEVEL(page_size);
 
@@ -1536,16 +1571,19 @@ static u64 *fetch_pte(struct protection_domain *domain,
 		      unsigned long address,
 		      unsigned long *page_size)
 {
+	struct domain_pgtable pgtable;
 	int level;
 	u64 *pte;
 
 	*page_size = 0;
 
-	if (address > PM_LEVEL_SIZE(domain->mode))
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	if (address > PM_LEVEL_SIZE(pgtable.mode))
 		return NULL;
 
-	level	   =  domain->mode - 1;
-	pte	   = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
+	level	   =  pgtable.mode - 1;
+	pte	   = &pgtable.root[PM_LEVEL_INDEX(level, address)];
 	*page_size =  PTE_LEVEL_PAGE_SIZE(level);
 
 	while (level > 0) {
@@ -1806,6 +1844,7 @@ static void dma_ops_domain_free(struct protection_domain *domain)
 static struct protection_domain *dma_ops_domain_alloc(void)
 {
 	struct protection_domain *domain;
+	u64 *pt_root, root;
 
 	domain = kzalloc(sizeof(struct protection_domain), GFP_KERNEL);
 	if (!domain)
@@ -1814,12 +1853,14 @@ static struct protection_domain *dma_ops_domain_alloc(void)
 	if (protection_domain_init(domain))
 		goto free_domain;
 
-	domain->mode = PAGE_MODE_3_LEVEL;
-	domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
-	domain->flags = PD_DMA_OPS_MASK;
-	if (!domain->pt_root)
+	pt_root = (void *)get_zeroed_page(GFP_KERNEL);
+	if (!pt_root)
 		goto free_domain;
 
+	root = amd_iommu_domain_encode_pgtable(pt_root, PAGE_MODE_3_LEVEL);
+	atomic64_set(&domain->pt_root, root);
+	domain->flags = PD_DMA_OPS_MASK;
+
 	if (iommu_get_dma_cookie(&domain->domain) == -ENOMEM)
 		goto free_domain;
 
@@ -1843,14 +1884,17 @@ static bool dma_ops_domain(struct protection_domain *domain)
 static void set_dte_entry(u16 devid, struct protection_domain *domain,
 			  bool ats, bool ppr)
 {
+	struct domain_pgtable pgtable;
 	u64 pte_root = 0;
 	u64 flags = 0;
 	u32 old_domid;
 
-	if (domain->mode != PAGE_MODE_NONE)
-		pte_root = iommu_virt_to_phys(domain->pt_root);
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+	if (pgtable.mode != PAGE_MODE_NONE)
+		pte_root = iommu_virt_to_phys(pgtable.root);
 
-	pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
+	pte_root |= (pgtable.mode & DEV_ENTRY_MODE_MASK)
 		    << DEV_ENTRY_MODE_SHIFT;
 	pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV;
 
@@ -2375,6 +2419,7 @@ static struct protection_domain *protection_domain_alloc(void)
 static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 {
 	struct protection_domain *pdomain;
+	u64 *pt_root, root;
 
 	switch (type) {
 	case IOMMU_DOMAIN_UNMANAGED:
@@ -2382,13 +2427,15 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 		if (!pdomain)
 			return NULL;
 
-		pdomain->mode    = PAGE_MODE_3_LEVEL;
-		pdomain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
-		if (!pdomain->pt_root) {
+		pt_root = (void *)get_zeroed_page(GFP_KERNEL);
+		if (!pt_root) {
 			protection_domain_free(pdomain);
 			return NULL;
 		}
 
+		root = amd_iommu_domain_encode_pgtable(pt_root, PAGE_MODE_3_LEVEL);
+		atomic64_set(&pdomain->pt_root, root);
+
 		pdomain->domain.geometry.aperture_start = 0;
 		pdomain->domain.geometry.aperture_end   = ~0ULL;
 		pdomain->domain.geometry.force_aperture = true;
@@ -2406,7 +2453,7 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 		if (!pdomain)
 			return NULL;
 
-		pdomain->mode = PAGE_MODE_NONE;
+		atomic64_set(&pdomain->pt_root, PAGE_MODE_NONE);
 		break;
 	default:
 		return NULL;
@@ -2418,6 +2465,7 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
 static void amd_iommu_domain_free(struct iommu_domain *dom)
 {
 	struct protection_domain *domain;
+	struct domain_pgtable pgtable;
 
 	domain = to_pdomain(dom);
 
@@ -2435,7 +2483,9 @@ static void amd_iommu_domain_free(struct iommu_domain *dom)
 		dma_ops_domain_free(domain);
 		break;
 	default:
-		if (domain->mode != PAGE_MODE_NONE)
+		amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+		if (pgtable.mode != PAGE_MODE_NONE)
 			free_pagetable(domain);
 
 		if (domain->flags & PD_IOMMUV2_MASK)
@@ -2518,10 +2568,12 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
 			 gfp_t gfp)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct domain_pgtable pgtable;
 	int prot = 0;
 	int ret;
 
-	if (domain->mode == PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode == PAGE_MODE_NONE)
 		return -EINVAL;
 
 	if (iommu_prot & IOMMU_READ)
@@ -2541,8 +2593,10 @@ static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
 			      struct iommu_iotlb_gather *gather)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct domain_pgtable pgtable;
 
-	if (domain->mode == PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode == PAGE_MODE_NONE)
 		return 0;
 
 	return iommu_unmap_page(domain, iova, page_size);
@@ -2553,9 +2607,11 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 {
 	struct protection_domain *domain = to_pdomain(dom);
 	unsigned long offset_mask, pte_pgsize;
+	struct domain_pgtable pgtable;
 	u64 *pte, __pte;
 
-	if (domain->mode == PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode == PAGE_MODE_NONE)
 		return iova;
 
 	pte = fetch_pte(domain, iova, &pte_pgsize);
@@ -2708,16 +2764,26 @@ EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
 void amd_iommu_domain_direct_map(struct iommu_domain *dom)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct domain_pgtable pgtable;
 	unsigned long flags;
+	u64 pt_root;
 
 	spin_lock_irqsave(&domain->lock, flags);
 
+	/* First save pgtable configuration*/
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+
 	/* Update data structure */
-	domain->mode    = PAGE_MODE_NONE;
+	pt_root = amd_iommu_domain_encode_pgtable(NULL, PAGE_MODE_NONE);
+	atomic64_set(&domain->pt_root, pt_root);
 
 	/* Make changes visible to IOMMUs */
 	update_domain(domain);
 
+	/* Restore old pgtable in domain->ptroot to free page-table */
+	pt_root = amd_iommu_domain_encode_pgtable(pgtable.root, pgtable.mode);
+	atomic64_set(&domain->pt_root, pt_root);
+
 	/* Page-table is not visible to IOMMU anymore, so free it */
 	free_pagetable(domain);
 
@@ -2908,9 +2974,11 @@ static u64 *__get_gcr3_pte(u64 *root, int level, int pasid, bool alloc)
 static int __set_gcr3(struct protection_domain *domain, int pasid,
 		      unsigned long cr3)
 {
+	struct domain_pgtable pgtable;
 	u64 *pte;
 
-	if (domain->mode != PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode != PAGE_MODE_NONE)
 		return -EINVAL;
 
 	pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true);
@@ -2924,9 +2992,11 @@ static int __set_gcr3(struct protection_domain *domain, int pasid,
 
 static int __clear_gcr3(struct protection_domain *domain, int pasid)
 {
+	struct domain_pgtable pgtable;
 	u64 *pte;
 
-	if (domain->mode != PAGE_MODE_NONE)
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable.mode != PAGE_MODE_NONE)
 		return -EINVAL;
 
 	pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index ca8c4522045b3..7a8fdec138bd1 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -468,8 +468,7 @@ struct protection_domain {
 				       iommu core code */
 	spinlock_t lock;	/* mostly used to lock the page table*/
 	u16 id;			/* the domain id written to the device table */
-	int mode;		/* paging mode (0-6 levels) */
-	u64 *pt_root;		/* page table root pointer */
+	atomic64_t pt_root;	/* pgtable root and pgtable mode */
 	int glx;		/* Number of levels for GCR3 table */
 	u64 *gcr3_tbl;		/* Guest CR3 table */
 	unsigned long flags;	/* flags to find out type of domain */
@@ -477,6 +476,12 @@ struct protection_domain {
 	unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */
 };
 
+/* For decocded pt_root */
+struct domain_pgtable {
+	int mode;
+	u64 *root;
+};
+
 /*
  * Structure where we save information about one hardware AMD IOMMU in the
  * system.
-- 
2.20.1

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[PATCH AUTOSEL 5.6 41/62] iommu/amd: Do not loop forever when trying to increase address space

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit 5b8a9a047b6cad361405c7900c1e1cdd378c4589 ]

When increase_address_space() fails to allocate memory, alloc_pte()
will call it again until it succeeds. Do not loop forever while trying
to increase the address space and just return an error instead.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-3-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 28229a38af4d2..68da484a69dd0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1489,8 +1489,19 @@ static u64 *alloc_pte(struct protection_domain *domain,
 	amd_iommu_domain_get_pgtable(domain, &pgtable);
 
 	while (address > PM_LEVEL_SIZE(pgtable.mode)) {
-		*updated = increase_address_space(domain, address, gfp) || *updated;
+		bool upd = increase_address_space(domain, address, gfp);
+
+		/* Read new values to check if update was successful */
 		amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+		/*
+		 * Return an error if there is no memory to update the
+		 * page-table.
+		 */
+		if (!upd && (address > PM_LEVEL_SIZE(pgtable.mode)))
+			return NULL;
+
+		*updated = *updated || upd;
 	}
 
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 41/62] iommu/amd: Do not loop forever when trying to increase address space

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit 5b8a9a047b6cad361405c7900c1e1cdd378c4589 ]

When increase_address_space() fails to allocate memory, alloc_pte()
will call it again until it succeeds. Do not loop forever while trying
to increase the address space and just return an error instead.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-3-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 28229a38af4d2..68da484a69dd0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1489,8 +1489,19 @@ static u64 *alloc_pte(struct protection_domain *domain,
 	amd_iommu_domain_get_pgtable(domain, &pgtable);
 
 	while (address > PM_LEVEL_SIZE(pgtable.mode)) {
-		*updated = increase_address_space(domain, address, gfp) || *updated;
+		bool upd = increase_address_space(domain, address, gfp);
+
+		/* Read new values to check if update was successful */
 		amd_iommu_domain_get_pgtable(domain, &pgtable);
+
+		/*
+		 * Return an error if there is no memory to update the
+		 * page-table.
+		 */
+		if (!upd && (address > PM_LEVEL_SIZE(pgtable.mode)))
+			return NULL;
+
+		*updated = *updated || upd;
 	}
 
 
-- 
2.20.1

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[PATCH AUTOSEL 5.6 42/62] iommu/amd: Call domain_flush_complete() in update_domain()

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit f44a4d7e4f1cdef73c90b1dc749c4d8a7372a8eb ]

The update_domain() function is expected to also inform the hardware
about domain changes. This needs a COMPLETION_WAIT command to be sent
to all IOMMUs which use the domain.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-4-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 68da484a69dd0..d2499c86d395c 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2321,6 +2321,7 @@ static void update_domain(struct protection_domain *domain)
 
 	domain_flush_devices(domain);
 	domain_flush_tlb_pde(domain);
+	domain_flush_complete(domain);
 }
 
 int __init amd_iommu_init_api(void)
-- 
2.20.1

[PATCH AUTOSEL 5.6 42/62] iommu/amd: Call domain_flush_complete() in update_domain()

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit f44a4d7e4f1cdef73c90b1dc749c4d8a7372a8eb ]

The update_domain() function is expected to also inform the hardware
about domain changes. This needs a COMPLETION_WAIT command to be sent
to all IOMMUs which use the domain.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-4-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 68da484a69dd0..d2499c86d395c 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2321,6 +2321,7 @@ static void update_domain(struct protection_domain *domain)
 
 	domain_flush_devices(domain);
 	domain_flush_tlb_pde(domain);
+	domain_flush_complete(domain);
 }
 
 int __init amd_iommu_init_api(void)
-- 
2.20.1

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[PATCH AUTOSEL 5.6 43/62] iommu/amd: Update Device Table in increase_address_space()

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit 19c6978fba68a2cdedee7d55fb8c3063d47982d9 ]

The Device Table needs to be updated before the new page-table root
can be published in domain->pt_root. Otherwise a concurrent call to
fetch_pte might fetch a PTE which is not reachable through the Device
Table Entry.

Fixes: 92d420ec028d ("iommu/amd: Relax locking in dma_ops path")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-5-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c | 49 ++++++++++++++++++++++++++++-----------
 1 file changed, 36 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index d2499c86d395c..2ae1daac888a0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -101,6 +101,8 @@ struct kmem_cache *amd_iommu_irq_cache;
 static void update_domain(struct protection_domain *domain);
 static int protection_domain_init(struct protection_domain *domain);
 static void detach_device(struct device *dev);
+static void update_and_flush_device_table(struct protection_domain *domain,
+					  struct domain_pgtable *pgtable);
 
 /****************************************************************************
  *
@@ -1461,8 +1463,16 @@ static bool increase_address_space(struct protection_domain *domain,
 
 	*pte = PM_LEVEL_PDE(pgtable.mode, iommu_virt_to_phys(pgtable.root));
 
-	root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode + 1);
+	pgtable.root  = pte;
+	pgtable.mode += 1;
+	update_and_flush_device_table(domain, &pgtable);
+	domain_flush_complete(domain);
 
+	/*
+	 * Device Table needs to be updated and flushed before the new root can
+	 * be published.
+	 */
+	root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode);
 	atomic64_set(&domain->pt_root, root);
 
 	ret = true;
@@ -1893,19 +1903,17 @@ static bool dma_ops_domain(struct protection_domain *domain)
 }
 
 static void set_dte_entry(u16 devid, struct protection_domain *domain,
+			  struct domain_pgtable *pgtable,
 			  bool ats, bool ppr)
 {
-	struct domain_pgtable pgtable;
 	u64 pte_root = 0;
 	u64 flags = 0;
 	u32 old_domid;
 
-	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable->mode != PAGE_MODE_NONE)
+		pte_root = iommu_virt_to_phys(pgtable->root);
 
-	if (pgtable.mode != PAGE_MODE_NONE)
-		pte_root = iommu_virt_to_phys(pgtable.root);
-
-	pte_root |= (pgtable.mode & DEV_ENTRY_MODE_MASK)
+	pte_root |= (pgtable->mode & DEV_ENTRY_MODE_MASK)
 		    << DEV_ENTRY_MODE_SHIFT;
 	pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV;
 
@@ -1978,6 +1986,7 @@ static void clear_dte_entry(u16 devid)
 static void do_attach(struct iommu_dev_data *dev_data,
 		      struct protection_domain *domain)
 {
+	struct domain_pgtable pgtable;
 	struct amd_iommu *iommu;
 	bool ats;
 
@@ -1993,7 +2002,9 @@ static void do_attach(struct iommu_dev_data *dev_data,
 	domain->dev_cnt                 += 1;
 
 	/* Update device table */
-	set_dte_entry(dev_data->devid, domain, ats, dev_data->iommu_v2);
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	set_dte_entry(dev_data->devid, domain, &pgtable,
+		      ats, dev_data->iommu_v2);
 	clone_aliases(dev_data->pdev);
 
 	device_flush_dte(dev_data);
@@ -2304,22 +2315,34 @@ static int amd_iommu_domain_get_attr(struct iommu_domain *domain,
  *
  *****************************************************************************/
 
-static void update_device_table(struct protection_domain *domain)
+static void update_device_table(struct protection_domain *domain,
+				struct domain_pgtable *pgtable)
 {
 	struct iommu_dev_data *dev_data;
 
 	list_for_each_entry(dev_data, &domain->dev_list, list) {
-		set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled,
-			      dev_data->iommu_v2);
+		set_dte_entry(dev_data->devid, domain, pgtable,
+			      dev_data->ats.enabled, dev_data->iommu_v2);
 		clone_aliases(dev_data->pdev);
 	}
 }
 
+static void update_and_flush_device_table(struct protection_domain *domain,
+					  struct domain_pgtable *pgtable)
+{
+	update_device_table(domain, pgtable);
+	domain_flush_devices(domain);
+}
+
 static void update_domain(struct protection_domain *domain)
 {
-	update_device_table(domain);
+	struct domain_pgtable pgtable;
 
-	domain_flush_devices(domain);
+	/* Update device table */
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	update_and_flush_device_table(domain, &pgtable);
+
+	/* Flush domain TLB(s) and wait for completion */
 	domain_flush_tlb_pde(domain);
 	domain_flush_complete(domain);
 }
-- 
2.20.1

[PATCH AUTOSEL 5.6 43/62] iommu/amd: Update Device Table in increase_address_space()

[Sasha Levin]

From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit 19c6978fba68a2cdedee7d55fb8c3063d47982d9 ]

The Device Table needs to be updated before the new page-table root
can be published in domain->pt_root. Otherwise a concurrent call to
fetch_pte might fetch a PTE which is not reachable through the Device
Table Entry.

Fixes: 92d420ec028d ("iommu/amd: Relax locking in dma_ops path")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200504125413.16798-5-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/amd_iommu.c | 49 ++++++++++++++++++++++++++++-----------
 1 file changed, 36 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index d2499c86d395c..2ae1daac888a0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -101,6 +101,8 @@ struct kmem_cache *amd_iommu_irq_cache;
 static void update_domain(struct protection_domain *domain);
 static int protection_domain_init(struct protection_domain *domain);
 static void detach_device(struct device *dev);
+static void update_and_flush_device_table(struct protection_domain *domain,
+					  struct domain_pgtable *pgtable);
 
 /****************************************************************************
  *
@@ -1461,8 +1463,16 @@ static bool increase_address_space(struct protection_domain *domain,
 
 	*pte = PM_LEVEL_PDE(pgtable.mode, iommu_virt_to_phys(pgtable.root));
 
-	root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode + 1);
+	pgtable.root  = pte;
+	pgtable.mode += 1;
+	update_and_flush_device_table(domain, &pgtable);
+	domain_flush_complete(domain);
 
+	/*
+	 * Device Table needs to be updated and flushed before the new root can
+	 * be published.
+	 */
+	root = amd_iommu_domain_encode_pgtable(pte, pgtable.mode);
 	atomic64_set(&domain->pt_root, root);
 
 	ret = true;
@@ -1893,19 +1903,17 @@ static bool dma_ops_domain(struct protection_domain *domain)
 }
 
 static void set_dte_entry(u16 devid, struct protection_domain *domain,
+			  struct domain_pgtable *pgtable,
 			  bool ats, bool ppr)
 {
-	struct domain_pgtable pgtable;
 	u64 pte_root = 0;
 	u64 flags = 0;
 	u32 old_domid;
 
-	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	if (pgtable->mode != PAGE_MODE_NONE)
+		pte_root = iommu_virt_to_phys(pgtable->root);
 
-	if (pgtable.mode != PAGE_MODE_NONE)
-		pte_root = iommu_virt_to_phys(pgtable.root);
-
-	pte_root |= (pgtable.mode & DEV_ENTRY_MODE_MASK)
+	pte_root |= (pgtable->mode & DEV_ENTRY_MODE_MASK)
 		    << DEV_ENTRY_MODE_SHIFT;
 	pte_root |= DTE_FLAG_IR | DTE_FLAG_IW | DTE_FLAG_V | DTE_FLAG_TV;
 
@@ -1978,6 +1986,7 @@ static void clear_dte_entry(u16 devid)
 static void do_attach(struct iommu_dev_data *dev_data,
 		      struct protection_domain *domain)
 {
+	struct domain_pgtable pgtable;
 	struct amd_iommu *iommu;
 	bool ats;
 
@@ -1993,7 +2002,9 @@ static void do_attach(struct iommu_dev_data *dev_data,
 	domain->dev_cnt                 += 1;
 
 	/* Update device table */
-	set_dte_entry(dev_data->devid, domain, ats, dev_data->iommu_v2);
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	set_dte_entry(dev_data->devid, domain, &pgtable,
+		      ats, dev_data->iommu_v2);
 	clone_aliases(dev_data->pdev);
 
 	device_flush_dte(dev_data);
@@ -2304,22 +2315,34 @@ static int amd_iommu_domain_get_attr(struct iommu_domain *domain,
  *
  *****************************************************************************/
 
-static void update_device_table(struct protection_domain *domain)
+static void update_device_table(struct protection_domain *domain,
+				struct domain_pgtable *pgtable)
 {
 	struct iommu_dev_data *dev_data;
 
 	list_for_each_entry(dev_data, &domain->dev_list, list) {
-		set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled,
-			      dev_data->iommu_v2);
+		set_dte_entry(dev_data->devid, domain, pgtable,
+			      dev_data->ats.enabled, dev_data->iommu_v2);
 		clone_aliases(dev_data->pdev);
 	}
 }
 
+static void update_and_flush_device_table(struct protection_domain *domain,
+					  struct domain_pgtable *pgtable)
+{
+	update_device_table(domain, pgtable);
+	domain_flush_devices(domain);
+}
+
 static void update_domain(struct protection_domain *domain)
 {
-	update_device_table(domain);
+	struct domain_pgtable pgtable;
 
-	domain_flush_devices(domain);
+	/* Update device table */
+	amd_iommu_domain_get_pgtable(domain, &pgtable);
+	update_and_flush_device_table(domain, &pgtable);
+
+	/* Flush domain TLB(s) and wait for completion */
 	domain_flush_tlb_pde(domain);
 	domain_flush_complete(domain);
 }
-- 
2.20.1

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https://lists.linuxfoundation.org/mailman/listinfo/iommu

[PATCH AUTOSEL 5.6 44/62] drm/amd/display: Update DCN2.1 DV Code Revision

[Sasha Levin]

From: Sung Lee <sung.lee@amd.com>

[ Upstream commit b95e51eb9f2ee7b6d6c3203a2f75122349aa77be ]

[WHY & HOW]
There is a problem in hscale_pixel_rate, the bug
causes DCN to be more optimistic (more likely to underflow)
in upscale cases during prefetch.
This commit ports the fix from DV code to address these issues.

Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
index a38baa73d4841..b8ec08e3b7a36 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
@@ -1200,7 +1200,7 @@ static void dml_rq_dlg_get_dlg_params(
 	min_hratio_fact_l = 1.0;
 	min_hratio_fact_c = 1.0;
 
-	if (htaps_l <= 1)
+	if (hratio_l <= 1)
 		min_hratio_fact_l = 2.0;
 	else if (htaps_l <= 6) {
 		if ((hratio_l * 2.0) > 4.0)
@@ -1216,7 +1216,7 @@ static void dml_rq_dlg_get_dlg_params(
 
 	hscale_pixel_rate_l = min_hratio_fact_l * dppclk_freq_in_mhz;
 
-	if (htaps_c <= 1)
+	if (hratio_c <= 1)
 		min_hratio_fact_c = 2.0;
 	else if (htaps_c <= 6) {
 		if ((hratio_c * 2.0) > 4.0)
@@ -1522,8 +1522,8 @@ static void dml_rq_dlg_get_dlg_params(
 
 	disp_dlg_regs->refcyc_per_vm_group_vblank   = get_refcyc_per_vm_group_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
 	disp_dlg_regs->refcyc_per_vm_group_flip     = get_refcyc_per_vm_group_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
-	disp_dlg_regs->refcyc_per_vm_req_vblank     = get_refcyc_per_vm_req_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
-	disp_dlg_regs->refcyc_per_vm_req_flip       = get_refcyc_per_vm_req_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
+	disp_dlg_regs->refcyc_per_vm_req_vblank     = get_refcyc_per_vm_req_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz * dml_pow(2, 10);
+	disp_dlg_regs->refcyc_per_vm_req_flip       = get_refcyc_per_vm_req_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz * dml_pow(2, 10);
 
 	// Clamp to max for now
 	if (disp_dlg_regs->refcyc_per_vm_group_vblank >= (unsigned int)dml_pow(2, 23))
-- 
2.20.1

[PATCH AUTOSEL 5.6 44/62] drm/amd/display: Update DCN2.1 DV Code Revision

[Sasha Levin]

From: Sung Lee <sung.lee@amd.com>

[ Upstream commit b95e51eb9f2ee7b6d6c3203a2f75122349aa77be ]

[WHY & HOW]
There is a problem in hscale_pixel_rate, the bug
causes DCN to be more optimistic (more likely to underflow)
in upscale cases during prefetch.
This commit ports the fix from DV code to address these issues.

Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
index a38baa73d4841..b8ec08e3b7a36 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
@@ -1200,7 +1200,7 @@ static void dml_rq_dlg_get_dlg_params(
 	min_hratio_fact_l = 1.0;
 	min_hratio_fact_c = 1.0;
 
-	if (htaps_l <= 1)
+	if (hratio_l <= 1)
 		min_hratio_fact_l = 2.0;
 	else if (htaps_l <= 6) {
 		if ((hratio_l * 2.0) > 4.0)
@@ -1216,7 +1216,7 @@ static void dml_rq_dlg_get_dlg_params(
 
 	hscale_pixel_rate_l = min_hratio_fact_l * dppclk_freq_in_mhz;
 
-	if (htaps_c <= 1)
+	if (hratio_c <= 1)
 		min_hratio_fact_c = 2.0;
 	else if (htaps_c <= 6) {
 		if ((hratio_c * 2.0) > 4.0)
@@ -1522,8 +1522,8 @@ static void dml_rq_dlg_get_dlg_params(
 
 	disp_dlg_regs->refcyc_per_vm_group_vblank   = get_refcyc_per_vm_group_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
 	disp_dlg_regs->refcyc_per_vm_group_flip     = get_refcyc_per_vm_group_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
-	disp_dlg_regs->refcyc_per_vm_req_vblank     = get_refcyc_per_vm_req_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
-	disp_dlg_regs->refcyc_per_vm_req_flip       = get_refcyc_per_vm_req_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
+	disp_dlg_regs->refcyc_per_vm_req_vblank     = get_refcyc_per_vm_req_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz * dml_pow(2, 10);
+	disp_dlg_regs->refcyc_per_vm_req_flip       = get_refcyc_per_vm_req_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz * dml_pow(2, 10);
 
 	// Clamp to max for now
 	if (disp_dlg_regs->refcyc_per_vm_group_vblank >= (unsigned int)dml_pow(2, 23))
-- 
2.20.1

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH AUTOSEL 5.6 44/62] drm/amd/display: Update DCN2.1 DV Code Revision

[Sasha Levin]

From: Sung Lee <sung.lee@amd.com>

[ Upstream commit b95e51eb9f2ee7b6d6c3203a2f75122349aa77be ]

[WHY & HOW]
There is a problem in hscale_pixel_rate, the bug
causes DCN to be more optimistic (more likely to underflow)
in upscale cases during prefetch.
This commit ports the fix from DV code to address these issues.

Signed-off-by: Sung Lee <sung.lee@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
index a38baa73d4841..b8ec08e3b7a36 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c
@@ -1200,7 +1200,7 @@ static void dml_rq_dlg_get_dlg_params(
 	min_hratio_fact_l = 1.0;
 	min_hratio_fact_c = 1.0;
 
-	if (htaps_l <= 1)
+	if (hratio_l <= 1)
 		min_hratio_fact_l = 2.0;
 	else if (htaps_l <= 6) {
 		if ((hratio_l * 2.0) > 4.0)
@@ -1216,7 +1216,7 @@ static void dml_rq_dlg_get_dlg_params(
 
 	hscale_pixel_rate_l = min_hratio_fact_l * dppclk_freq_in_mhz;
 
-	if (htaps_c <= 1)
+	if (hratio_c <= 1)
 		min_hratio_fact_c = 2.0;
 	else if (htaps_c <= 6) {
 		if ((hratio_c * 2.0) > 4.0)
@@ -1522,8 +1522,8 @@ static void dml_rq_dlg_get_dlg_params(
 
 	disp_dlg_regs->refcyc_per_vm_group_vblank   = get_refcyc_per_vm_group_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
 	disp_dlg_regs->refcyc_per_vm_group_flip     = get_refcyc_per_vm_group_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
-	disp_dlg_regs->refcyc_per_vm_req_vblank     = get_refcyc_per_vm_req_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
-	disp_dlg_regs->refcyc_per_vm_req_flip       = get_refcyc_per_vm_req_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz;
+	disp_dlg_regs->refcyc_per_vm_req_vblank     = get_refcyc_per_vm_req_vblank(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz * dml_pow(2, 10);
+	disp_dlg_regs->refcyc_per_vm_req_flip       = get_refcyc_per_vm_req_flip(mode_lib, e2e_pipe_param, num_pipes, pipe_idx) * refclk_freq_in_mhz * dml_pow(2, 10);
 
 	// Clamp to max for now
 	if (disp_dlg_regs->refcyc_per_vm_group_vblank >= (unsigned int)dml_pow(2, 23))
-- 
2.20.1

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[PATCH AUTOSEL 5.6 45/62] drm/amd/display: fix counter in wait_for_no_pipes_pending

[Sasha Levin]

From: Roman Li <roman.li@amd.com>

[ Upstream commit 80797dd6f1a525d1160c463d6a9f9d29af182cbb ]

[Why]
Wait counter is not being reset for each pipe.

[How]
Move counter reset into pipe loop scope.

Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Zhan Liu <Zhan.Liu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 188e51600070b..b3987124183a7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -803,11 +803,10 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
 static void wait_for_no_pipes_pending(struct dc *dc, struct dc_state *context)
 {
 	int i;
-	int count = 0;
-	struct pipe_ctx *pipe;
 	PERF_TRACE();
 	for (i = 0; i < MAX_PIPES; i++) {
-		pipe = &context->res_ctx.pipe_ctx[i];
+		int count = 0;
+		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
 
 		if (!pipe->plane_state)
 			continue;
-- 
2.20.1

[PATCH AUTOSEL 5.6 45/62] drm/amd/display: fix counter in wait_for_no_pipes_pending

[Sasha Levin]

From: Roman Li <roman.li@amd.com>

[ Upstream commit 80797dd6f1a525d1160c463d6a9f9d29af182cbb ]

[Why]
Wait counter is not being reset for each pipe.

[How]
Move counter reset into pipe loop scope.

Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Zhan Liu <Zhan.Liu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 188e51600070b..b3987124183a7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -803,11 +803,10 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
 static void wait_for_no_pipes_pending(struct dc *dc, struct dc_state *context)
 {
 	int i;
-	int count = 0;
-	struct pipe_ctx *pipe;
 	PERF_TRACE();
 	for (i = 0; i < MAX_PIPES; i++) {
-		pipe = &context->res_ctx.pipe_ctx[i];
+		int count = 0;
+		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
 
 		if (!pipe->plane_state)
 			continue;
-- 
2.20.1

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[PATCH AUTOSEL 5.6 45/62] drm/amd/display: fix counter in wait_for_no_pipes_pending

[Sasha Levin]

From: Roman Li <roman.li@amd.com>

[ Upstream commit 80797dd6f1a525d1160c463d6a9f9d29af182cbb ]

[Why]
Wait counter is not being reset for each pipe.

[How]
Move counter reset into pipe loop scope.

Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Zhan Liu <Zhan.Liu@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 188e51600070b..b3987124183a7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -803,11 +803,10 @@ static void disable_dangling_plane(struct dc *dc, struct dc_state *context)
 static void wait_for_no_pipes_pending(struct dc *dc, struct dc_state *context)
 {
 	int i;
-	int count = 0;
-	struct pipe_ctx *pipe;
 	PERF_TRACE();
 	for (i = 0; i < MAX_PIPES; i++) {
-		pipe = &context->res_ctx.pipe_ctx[i];
+		int count = 0;
+		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
 
 		if (!pipe->plane_state)
 			continue;
-- 
2.20.1

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[PATCH AUTOSEL 5.6 46/62] drm/amd/display: Prevent dpcd reads with passive dongles

[Sasha Levin]

From: Aurabindo Pillai <aurabindo.pillai@amd.com>

[ Upstream commit e6142dd511425cb827b5db869f489eb81f5f994d ]

[why]
During hotplug, a DP port may be connected to the sink through
passive adapter which does not support DPCD reads. Issuing reads
without checking for this condition will result in errors

[how]
Ensure the link is in aux_mode before initiating operation that result
in a DPCD read.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8136a58deb393..f98c42150b4f3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1941,17 +1941,22 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
 		dc_sink_retain(aconnector->dc_sink);
 		if (sink->dc_edid.length == 0) {
 			aconnector->edid = NULL;
-			drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
+			if (aconnector->dc_link->aux_mode) {
+				drm_dp_cec_unset_edid(
+					&aconnector->dm_dp_aux.aux);
+			}
 		} else {
 			aconnector->edid =
-				(struct edid *) sink->dc_edid.raw_edid;
-
+				(struct edid *)sink->dc_edid.raw_edid;
 
 			drm_connector_update_edid_property(connector,
-					aconnector->edid);
-			drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
-					    aconnector->edid);
+							   aconnector->edid);
+
+			if (aconnector->dc_link->aux_mode)
+				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
+						    aconnector->edid);
 		}
+
 		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
 
 	} else {
-- 
2.20.1

[PATCH AUTOSEL 5.6 46/62] drm/amd/display: Prevent dpcd reads with passive dongles

[Sasha Levin]

From: Aurabindo Pillai <aurabindo.pillai@amd.com>

[ Upstream commit e6142dd511425cb827b5db869f489eb81f5f994d ]

[why]
During hotplug, a DP port may be connected to the sink through
passive adapter which does not support DPCD reads. Issuing reads
without checking for this condition will result in errors

[how]
Ensure the link is in aux_mode before initiating operation that result
in a DPCD read.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8136a58deb393..f98c42150b4f3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1941,17 +1941,22 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
 		dc_sink_retain(aconnector->dc_sink);
 		if (sink->dc_edid.length == 0) {
 			aconnector->edid = NULL;
-			drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
+			if (aconnector->dc_link->aux_mode) {
+				drm_dp_cec_unset_edid(
+					&aconnector->dm_dp_aux.aux);
+			}
 		} else {
 			aconnector->edid =
-				(struct edid *) sink->dc_edid.raw_edid;
-
+				(struct edid *)sink->dc_edid.raw_edid;
 
 			drm_connector_update_edid_property(connector,
-					aconnector->edid);
-			drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
-					    aconnector->edid);
+							   aconnector->edid);
+
+			if (aconnector->dc_link->aux_mode)
+				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
+						    aconnector->edid);
 		}
+
 		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
 
 	} else {
-- 
2.20.1

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[PATCH AUTOSEL 5.6 46/62] drm/amd/display: Prevent dpcd reads with passive dongles

[Sasha Levin]

From: Aurabindo Pillai <aurabindo.pillai@amd.com>

[ Upstream commit e6142dd511425cb827b5db869f489eb81f5f994d ]

[why]
During hotplug, a DP port may be connected to the sink through
passive adapter which does not support DPCD reads. Issuing reads
without checking for this condition will result in errors

[how]
Ensure the link is in aux_mode before initiating operation that result
in a DPCD read.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8136a58deb393..f98c42150b4f3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1941,17 +1941,22 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
 		dc_sink_retain(aconnector->dc_sink);
 		if (sink->dc_edid.length == 0) {
 			aconnector->edid = NULL;
-			drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
+			if (aconnector->dc_link->aux_mode) {
+				drm_dp_cec_unset_edid(
+					&aconnector->dm_dp_aux.aux);
+			}
 		} else {
 			aconnector->edid =
-				(struct edid *) sink->dc_edid.raw_edid;
-
+				(struct edid *)sink->dc_edid.raw_edid;
 
 			drm_connector_update_edid_property(connector,
-					aconnector->edid);
-			drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
-					    aconnector->edid);
+							   aconnector->edid);
+
+			if (aconnector->dc_link->aux_mode)
+				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
+						    aconnector->edid);
 		}
+
 		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
 
 	} else {
-- 
2.20.1

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[PATCH AUTOSEL 5.6 47/62] KVM: selftests: Fix build for evmcs.h

[Sasha Levin]

From: Peter Xu <peterx@redhat.com>

[ Upstream commit 8ffdaf9155ebe517cdec5edbcca19ba6e7ee9c3c ]

I got this error when building kvm selftests:

/usr/bin/ld: /home/xz/git/linux/tools/testing/selftests/kvm/libkvm.a(vmx.o):/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:222: multiple definition of `current_evmcs'; /tmp/cco1G48P.o:/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:222: first defined here
/usr/bin/ld: /home/xz/git/linux/tools/testing/selftests/kvm/libkvm.a(vmx.o):/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:223: multiple definition of `current_vp_assist'; /tmp/cco1G48P.o:/home/xz/git/linux/tools/testing/selftests/kvm/include/evmcs.h:223: first defined here

I think it's because evmcs.h is included both in a test file and a lib file so
the structs have multiple declarations when linking.  After all it's not a good
habit to declare structs in the header files.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200504220607.99627-1-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/kvm/include/evmcs.h  | 4 ++--
 tools/testing/selftests/kvm/lib/x86_64/vmx.c | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/evmcs.h b/tools/testing/selftests/kvm/include/evmcs.h
index 4912d23844bc6..e31ac9c5ead0c 100644
--- a/tools/testing/selftests/kvm/include/evmcs.h
+++ b/tools/testing/selftests/kvm/include/evmcs.h
@@ -217,8 +217,8 @@ struct hv_enlightened_vmcs {
 #define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK	\
 		(~((1ull << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) - 1))
 
-struct hv_enlightened_vmcs *current_evmcs;
-struct hv_vp_assist_page *current_vp_assist;
+extern struct hv_enlightened_vmcs *current_evmcs;
+extern struct hv_vp_assist_page *current_vp_assist;
 
 int vcpu_enable_evmcs(struct kvm_vm *vm, int vcpu_id);
 
diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c b/tools/testing/selftests/kvm/lib/x86_64/vmx.c
index 7aaa99ca4dbc3..ce528f3cf093c 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c
@@ -17,6 +17,9 @@
 
 bool enable_evmcs;
 
+struct hv_enlightened_vmcs *current_evmcs;
+struct hv_vp_assist_page *current_vp_assist;
+
 struct eptPageTableEntry {
 	uint64_t readable:1;
 	uint64_t writable:1;
-- 
2.20.1

[PATCH AUTOSEL 5.6 48/62] ARM: futex: Address build warning

[Sasha Levin]

From: Thomas Gleixner <tglx@linutronix.de>

[ Upstream commit 8101b5a1531f3390b3a69fa7934c70a8fd6566ad ]

Stephen reported the following build warning on a ARM multi_v7_defconfig
build with GCC 9.2.1:

kernel/futex.c: In function 'do_futex':
kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1676 |   return oldval == cmparg;
      |          ~~~~~~~^~~~~~~~~
kernel/futex.c:1652:6: note: 'oldval' was declared here
 1652 |  int oldval, ret;
      |      ^~~~~~

introduced by commit a08971e9488d ("futex: arch_futex_atomic_op_inuser()
calling conventions change").

While that change should not make any difference it confuses GCC which
fails to work out that oldval is not referenced when the return value is
not zero.

GCC fails to properly analyze arch_futex_atomic_op_inuser(). It's not the
early return, the issue is with the assembly macros. GCC fails to detect
that those either set 'ret' to 0 and set oldval or set 'ret' to -EFAULT
which makes oldval uninteresting. The store to the callsite supplied oldval
pointer is conditional on ret == 0.

The straight forward way to solve this is to make the store unconditional.

Aside of addressing the build warning this makes sense anyway because it
removes the conditional from the fastpath. In the error case the stored
value is uninteresting and the extra store does not matter at all.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/87pncao2ph.fsf@nanos.tec.linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm/include/asm/futex.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h
index 83c391b597d45..fdc4ae3e7378d 100644
--- a/arch/arm/include/asm/futex.h
+++ b/arch/arm/include/asm/futex.h
@@ -164,8 +164,13 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
 	preempt_enable();
 #endif
 
-	if (!ret)
-		*oval = oldval;
+	/*
+	 * Store unconditionally. If ret != 0 the extra store is the least
+	 * of the worries but GCC cannot figure out that __futex_atomic_op()
+	 * is either setting ret to -EFAULT or storing the old value in
+	 * oldval which results in a uninitialized warning at the call site.
+	 */
+	*oval = oldval;
 
 	return ret;
 }
-- 
2.20.1

[PATCH AUTOSEL 5.6 48/62] ARM: futex: Address build warning

[Sasha Levin]

From: Thomas Gleixner <tglx@linutronix.de>

[ Upstream commit 8101b5a1531f3390b3a69fa7934c70a8fd6566ad ]

Stephen reported the following build warning on a ARM multi_v7_defconfig
build with GCC 9.2.1:

kernel/futex.c: In function 'do_futex':
kernel/futex.c:1676:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized]
 1676 |   return oldval == cmparg;
      |          ~~~~~~~^~~~~~~~~
kernel/futex.c:1652:6: note: 'oldval' was declared here
 1652 |  int oldval, ret;
      |      ^~~~~~

introduced by commit a08971e9488d ("futex: arch_futex_atomic_op_inuser()
calling conventions change").

While that change should not make any difference it confuses GCC which
fails to work out that oldval is not referenced when the return value is
not zero.

GCC fails to properly analyze arch_futex_atomic_op_inuser(). It's not the
early return, the issue is with the assembly macros. GCC fails to detect
that those either set 'ret' to 0 and set oldval or set 'ret' to -EFAULT
which makes oldval uninteresting. The store to the callsite supplied oldval
pointer is conditional on ret == 0.

The straight forward way to solve this is to make the store unconditional.

Aside of addressing the build warning this makes sense anyway because it
removes the conditional from the fastpath. In the error case the stored
value is uninteresting and the extra store does not matter at all.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/87pncao2ph.fsf@nanos.tec.linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm/include/asm/futex.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/futex.h b/arch/arm/include/asm/futex.h
index 83c391b597d45..fdc4ae3e7378d 100644
--- a/arch/arm/include/asm/futex.h
+++ b/arch/arm/include/asm/futex.h
@@ -164,8 +164,13 @@ arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
 	preempt_enable();
 #endif
 
-	if (!ret)
-		*oval = oldval;
+	/*
+	 * Store unconditionally. If ret != 0 the extra store is the least
+	 * of the worries but GCC cannot figure out that __futex_atomic_op()
+	 * is either setting ret to -EFAULT or storing the old value in
+	 * oldval which results in a uninitialized warning at the call site.
+	 */
+	*oval = oldval;
 
 	return ret;
 }
-- 
2.20.1


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[PATCH AUTOSEL 5.6 49/62] net: dsa: ocelot: the MAC table on Felix is twice as large

[Sasha Levin]

From: Vladimir Oltean <vladimir.oltean@nxp.com>

[ Upstream commit 21ce7f3e16fbf89faaf149cfe0f730edfc553914 ]

When running 'bridge fdb dump' on Felix, sometimes learnt and static MAC
addresses would appear, sometimes they wouldn't.

Turns out, the MAC table has 4096 entries on VSC7514 (Ocelot) and 8192
entries on VSC9959 (Felix), so the existing code from the Ocelot common
library only dumped half of Felix's MAC table. They are both organized
as a 4-way set-associative TCAM, so we just need a single variable
indicating the correct number of rows.

Fixes: 56051948773e ("net: dsa: ocelot: add driver for Felix switch family")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/dsa/ocelot/felix.c          | 1 +
 drivers/net/dsa/ocelot/felix.h          | 1 +
 drivers/net/dsa/ocelot/felix_vsc9959.c  | 1 +
 drivers/net/ethernet/mscc/ocelot.c      | 6 ++----
 drivers/net/ethernet/mscc/ocelot_regs.c | 1 +
 include/soc/mscc/ocelot.h               | 1 +
 6 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 9e895ab586d5a..a7780c06fa65b 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -397,6 +397,7 @@ static int felix_init_structs(struct felix *felix, int num_phys_ports)
 	ocelot->stats_layout	= felix->info->stats_layout;
 	ocelot->num_stats	= felix->info->num_stats;
 	ocelot->shared_queue_sz	= felix->info->shared_queue_sz;
+	ocelot->num_mact_rows	= felix->info->num_mact_rows;
 	ocelot->ops		= felix->info->ops;
 
 	port_phy_modes = kcalloc(num_phys_ports, sizeof(phy_interface_t),
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index 3a7580015b621..8771d40324f10 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -15,6 +15,7 @@ struct felix_info {
 	const u32 *const		*map;
 	const struct ocelot_ops		*ops;
 	int				shared_queue_sz;
+	int				num_mact_rows;
 	const struct ocelot_stat_layout	*stats_layout;
 	unsigned int			num_stats;
 	int				num_ports;
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 2c812b481778c..edc1a67c002b6 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1090,6 +1090,7 @@ struct felix_info felix_info_vsc9959 = {
 	.stats_layout		= vsc9959_stats_layout,
 	.num_stats		= ARRAY_SIZE(vsc9959_stats_layout),
 	.shared_queue_sz	= 128 * 1024,
+	.num_mact_rows		= 2048,
 	.num_ports		= 6,
 	.switch_pci_bar		= 4,
 	.imdio_pci_bar		= 0,
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index b14286dc49fb5..33ef8690eafe9 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1016,10 +1016,8 @@ int ocelot_fdb_dump(struct ocelot *ocelot, int port,
 {
 	int i, j;
 
-	/* Loop through all the mac tables entries. There are 1024 rows of 4
-	 * entries.
-	 */
-	for (i = 0; i < 1024; i++) {
+	/* Loop through all the mac tables entries. */
+	for (i = 0; i < ocelot->num_mact_rows; i++) {
 		for (j = 0; j < 4; j++) {
 			struct ocelot_mact_entry entry;
 			bool is_static;
diff --git a/drivers/net/ethernet/mscc/ocelot_regs.c b/drivers/net/ethernet/mscc/ocelot_regs.c
index b88b5899b2273..7d4fd1b6addaf 100644
--- a/drivers/net/ethernet/mscc/ocelot_regs.c
+++ b/drivers/net/ethernet/mscc/ocelot_regs.c
@@ -431,6 +431,7 @@ int ocelot_chip_init(struct ocelot *ocelot, const struct ocelot_ops *ops)
 	ocelot->stats_layout = ocelot_stats_layout;
 	ocelot->num_stats = ARRAY_SIZE(ocelot_stats_layout);
 	ocelot->shared_queue_sz = 224 * 1024;
+	ocelot->num_mact_rows = 1024;
 	ocelot->ops = ops;
 
 	ret = ocelot_regfields_init(ocelot, ocelot_regfields);
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index f8e1955c86f14..7b5382e10bd29 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -437,6 +437,7 @@ struct ocelot {
 	unsigned int			num_stats;
 
 	int				shared_queue_sz;
+	int				num_mact_rows;
 
 	struct net_device		*hw_bridge_dev;
 	u16				bridge_mask;
-- 
2.20.1

[PATCH AUTOSEL 5.6 50/62] net: mscc: ocelot: ANA_AUTOAGE_AGE_PERIOD holds a value in seconds, not ms

[Sasha Levin]

From: Vladimir Oltean <vladimir.oltean@nxp.com>

[ Upstream commit c0d7eccbc76115b7eb337956c03d47d6a889cf8c ]

One may notice that automatically-learnt entries 'never' expire, even
though the bridge configures the address age period at 300 seconds.

Actually the value written to hardware corresponds to a time interval
1000 times higher than intended, i.e. 83 hours.

Fixes: a556c76adc05 ("net: mscc: Add initial Ocelot switch support")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Faineli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/mscc/ocelot.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 33ef8690eafe9..419e2ce2eac07 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1444,8 +1444,15 @@ static void ocelot_port_attr_stp_state_set(struct ocelot *ocelot, int port,
 
 void ocelot_set_ageing_time(struct ocelot *ocelot, unsigned int msecs)
 {
-	ocelot_write(ocelot, ANA_AUTOAGE_AGE_PERIOD(msecs / 2),
-		     ANA_AUTOAGE);
+	unsigned int age_period = ANA_AUTOAGE_AGE_PERIOD(msecs / 2000);
+
+	/* Setting AGE_PERIOD to zero effectively disables automatic aging,
+	 * which is clearly not what our intention is. So avoid that.
+	 */
+	if (!age_period)
+		age_period = 1;
+
+	ocelot_rmw(ocelot, age_period, ANA_AUTOAGE_AGE_PERIOD_M, ANA_AUTOAGE);
 }
 EXPORT_SYMBOL(ocelot_set_ageing_time);
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 51/62] wireguard: selftests: initalize ipv6 members to NULL to squelch clang warning

[Sasha Levin]

From: "Jason A. Donenfeld" <Jason@zx2c4.com>

[ Upstream commit 4fed818ef54b08d4b29200e416cce65546ad5312 ]

Without setting these to NULL, clang complains in certain
configurations that have CONFIG_IPV6=n:

In file included from drivers/net/wireguard/ratelimiter.c:223:
drivers/net/wireguard/selftest/ratelimiter.c:173:34: error: variable 'skb6' is uninitialized when used here [-Werror,-Wuninitialized]
                ret = timings_test(skb4, hdr4, skb6, hdr6, &test_count);
                                               ^~~~
drivers/net/wireguard/selftest/ratelimiter.c:123:29: note: initialize the variable 'skb6' to silence this warning
        struct sk_buff *skb4, *skb6;
                                   ^
                                    = NULL
drivers/net/wireguard/selftest/ratelimiter.c:173:40: error: variable 'hdr6' is uninitialized when used here [-Werror,-Wuninitialized]
                ret = timings_test(skb4, hdr4, skb6, hdr6, &test_count);
                                                     ^~~~
drivers/net/wireguard/selftest/ratelimiter.c:125:22: note: initialize the variable 'hdr6' to silence this warning
        struct ipv6hdr *hdr6;
                            ^

We silence this warning by setting the variables to NULL as the warning
suggests.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireguard/selftest/ratelimiter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireguard/selftest/ratelimiter.c b/drivers/net/wireguard/selftest/ratelimiter.c
index bcd6462e45401..007cd4457c5f6 100644
--- a/drivers/net/wireguard/selftest/ratelimiter.c
+++ b/drivers/net/wireguard/selftest/ratelimiter.c
@@ -120,9 +120,9 @@ bool __init wg_ratelimiter_selftest(void)
 	enum { TRIALS_BEFORE_GIVING_UP = 5000 };
 	bool success = false;
 	int test = 0, trials;
-	struct sk_buff *skb4, *skb6;
+	struct sk_buff *skb4, *skb6 = NULL;
 	struct iphdr *hdr4;
-	struct ipv6hdr *hdr6;
+	struct ipv6hdr *hdr6 = NULL;
 
 	if (IS_ENABLED(CONFIG_KASAN) || IS_ENABLED(CONFIG_UBSAN))
 		return true;
-- 
2.20.1

[PATCH AUTOSEL 5.6 52/62] tools/bootconfig: Fix resource leak in apply_xbc()

[Sasha Levin]

From: Yunfeng Ye <yeyunfeng@huawei.com>

[ Upstream commit 8842604446d1f005abcbf8c63c12eabdb5695094 ]

Fix the @data and @fd allocations that are leaked in the error path of
apply_xbc().

Link: http://lkml.kernel.org/r/583a49c9-c27a-931d-e6c2-6f63a4b18bea@huawei.com

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/bootconfig/main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
index a9b97814d1a93..5dbe893cf00cc 100644
--- a/tools/bootconfig/main.c
+++ b/tools/bootconfig/main.c
@@ -287,6 +287,7 @@ int apply_xbc(const char *path, const char *xbc_path)
 	ret = delete_xbc(path);
 	if (ret < 0) {
 		pr_err("Failed to delete previous boot config: %d\n", ret);
+		free(data);
 		return ret;
 	}
 
@@ -294,24 +295,26 @@ int apply_xbc(const char *path, const char *xbc_path)
 	fd = open(path, O_RDWR | O_APPEND);
 	if (fd < 0) {
 		pr_err("Failed to open %s: %d\n", path, fd);
+		free(data);
 		return fd;
 	}
 	/* TODO: Ensure the @path is initramfs/initrd image */
 	ret = write(fd, data, size + 8);
 	if (ret < 0) {
 		pr_err("Failed to apply a boot config: %d\n", ret);
-		return ret;
+		goto out;
 	}
 	/* Write a magic word of the bootconfig */
 	ret = write(fd, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN);
 	if (ret < 0) {
 		pr_err("Failed to apply a boot config magic: %d\n", ret);
-		return ret;
+		goto out;
 	}
+out:
 	close(fd);
 	free(data);
 
-	return 0;
+	return ret;
 }
 
 int usage(void)
-- 
2.20.1

[PATCH AUTOSEL 5.6 53/62] scripts/gdb: repair rb_first() and rb_last()

[Sasha Levin]

From: Aymeric Agon-Rambosson <aymeric.agon@yandex.com>

[ Upstream commit 50e36be1fb9572b2e4f2753340bdce3116bf2ce7 ]

The current implementations of the rb_first() and rb_last() gdb
functions have a variable that references itself in its instanciation,
which causes the function to throw an error if a specific condition on
the argument is met.  The original author rather intended to reference
the argument and made a typo.  Referring the argument instead makes the
function work as intended.

Signed-off-by: Aymeric Agon-Rambosson <aymeric.agon@yandex.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Nikolay Borisov <n.borisov.lkml@gmail.com>
Cc: Jackie Liu <liuyun01@kylinos.cn>
Cc: Jason Wessel <jason.wessel@windriver.com>
Link: http://lkml.kernel.org/r/20200427051029.354840-1-aymeric.agon@yandex.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 scripts/gdb/linux/rbtree.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/gdb/linux/rbtree.py b/scripts/gdb/linux/rbtree.py
index 39db889b874c9..c4b9916079178 100644
--- a/scripts/gdb/linux/rbtree.py
+++ b/scripts/gdb/linux/rbtree.py
@@ -12,7 +12,7 @@ rb_node_type = utils.CachedType("struct rb_node")
 
 def rb_first(root):
     if root.type == rb_root_type.get_type():
-        node = node.address.cast(rb_root_type.get_type().pointer())
+        node = root.address.cast(rb_root_type.get_type().pointer())
     elif root.type != rb_root_type.get_type().pointer():
         raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
 
@@ -28,7 +28,7 @@ def rb_first(root):
 
 def rb_last(root):
     if root.type == rb_root_type.get_type():
-        node = node.address.cast(rb_root_type.get_type().pointer())
+        node = root.address.cast(rb_root_type.get_type().pointer())
     elif root.type != rb_root_type.get_type().pointer():
         raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 54/62] Stop the ad-hoc games with -Wno-maybe-initialized

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit 78a5255ffb6a1af189a83e493d916ba1c54d8c75 ]

We have some rather random rules about when we accept the
"maybe-initialized" warnings, and when we don't.

For example, we consider it unreliable for gcc versions < 4.9, but also
if -O3 is enabled, or if optimizing for size.  And then various kernel
config options disabled it, because they know that they trigger that
warning by confusing gcc sufficiently (ie PROFILE_ALL_BRANCHES).

And now gcc-10 seems to be introducing a lot of those warnings too, so
it falls under the same heading as 4.9 did.

At the same time, we have a very straightforward way to _enable_ that
warning when wanted: use "W=2" to enable more warnings.

So stop playing these ad-hoc games, and just disable that warning by
default, with the known and straight-forward "if you want to work on the
extra compiler warnings, use W=123".

Would it be great to have code that is always so obvious that it never
confuses the compiler whether a variable is used initialized or not?
Yes, it would.  In a perfect world, the compilers would be smarter, and
our source code would be simpler.

That's currently not the world we live in, though.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile             |  7 +++----
 init/Kconfig         | 18 ------------------
 kernel/trace/Kconfig |  1 -
 3 files changed, 3 insertions(+), 23 deletions(-)

diff --git a/Makefile b/Makefile
index 744245f0c96cf..d226ec8bd167f 100644
--- a/Makefile
+++ b/Makefile
@@ -708,10 +708,6 @@ else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS += -Os
 endif
 
-ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
-KBUILD_CFLAGS   += -Wno-maybe-uninitialized
-endif
-
 # Tell gcc to never replace conditional load with a non-conditional one
 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
 KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
@@ -862,6 +858,9 @@ KBUILD_CFLAGS += -Wno-pointer-sign
 # disable stringop warnings in gcc 8+
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
+# Enabled with W=2, disabled by default as noisy
+KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
+
 # disable invalid "can't wrap" optimizations for signed / pointers
 KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
 
diff --git a/init/Kconfig b/init/Kconfig
index 4f717bfdbfe2d..ef59c5c36cdb5 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -36,22 +36,6 @@ config TOOLS_SUPPORT_RELR
 config CC_HAS_ASM_INLINE
 	def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 
-config CC_HAS_WARN_MAYBE_UNINITIALIZED
-	def_bool $(cc-option,-Wmaybe-uninitialized)
-	help
-	  GCC >= 4.7 supports this option.
-
-config CC_DISABLE_WARN_MAYBE_UNINITIALIZED
-	bool
-	depends on CC_HAS_WARN_MAYBE_UNINITIALIZED
-	default CC_IS_GCC && GCC_VERSION < 40900  # unreliable for GCC < 4.9
-	help
-	  GCC's -Wmaybe-uninitialized is not reliable by definition.
-	  Lots of false positive warnings are produced in some cases.
-
-	  If this option is enabled, -Wno-maybe-uninitialzed is passed
-	  to the compiler to suppress maybe-uninitialized warnings.
-
 config CONSTRUCTORS
 	bool
 	depends on !UML
@@ -1249,14 +1233,12 @@ config CC_OPTIMIZE_FOR_PERFORMANCE
 config CC_OPTIMIZE_FOR_PERFORMANCE_O3
 	bool "Optimize more for performance (-O3)"
 	depends on ARC
-	imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
 	help
 	  Choosing this option will pass "-O3" to your compiler to optimize
 	  the kernel yet more for performance.
 
 config CC_OPTIMIZE_FOR_SIZE
 	bool "Optimize for size (-Os)"
-	imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
 	help
 	  Choosing this option will pass "-Os" to your compiler resulting
 	  in a smaller kernel.
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 402eef84c859a..743647005f64e 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -466,7 +466,6 @@ config PROFILE_ANNOTATED_BRANCHES
 config PROFILE_ALL_BRANCHES
 	bool "Profile all if conditionals" if !FORTIFY_SOURCE
 	select TRACE_BRANCH_PROFILING
-	imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
 	help
 	  This tracer profiles all branch conditions. Every if ()
 	  taken in the kernel is recorded whether it hit or miss.
-- 
2.20.1

[PATCH AUTOSEL 5.6 55/62] gcc-10: disable 'zero-length-bounds' warning for now

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit 5c45de21a2223fe46cf9488c99a7fbcf01527670 ]

This is a fine warning, but we still have a number of zero-length arrays
in the kernel that come from the traditional gcc extension.  Yes, they
are getting converted to flexible arrays, but in the meantime the gcc-10
warning about zero-length bounds is very verbose, and is hiding other
issues.

I missed one actual build failure because it was hidden among hundreds
of lines of warning.  Thankfully I caught it on the second go before
pushing things out, but it convinced me that I really need to disable
the new warnings for now.

We'll hopefully be all done with our conversion to flexible arrays in
the not too distant future, and we can then re-enable this warning.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index d226ec8bd167f..daef13f382906 100644
--- a/Makefile
+++ b/Makefile
@@ -858,6 +858,9 @@ KBUILD_CFLAGS += -Wno-pointer-sign
 # disable stringop warnings in gcc 8+
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
+# We'll want to enable this eventually, but it's not going away for 5.7 at least
+KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
+
 # Enabled with W=2, disabled by default as noisy
 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 56/62] gcc-10: disable 'array-bounds' warning for now

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit 44720996e2d79e47d508b0abe99b931a726a3197 ]

This is another fine warning, related to the 'zero-length-bounds' one,
but hitting the same historical code in the kernel.

Because C didn't historically support flexible array members, we have
code that instead uses a one-sized array, the same way we have cases of
zero-sized arrays.

The one-sized arrays come from either not wanting to use the gcc
zero-sized array extension, or from a slight convenience-feature, where
particularly for strings, the size of the structure now includes the
allocation for the final NUL character.

So with a "char name[1];" at the end of a structure, you can do things
like

       v = my_malloc(sizeof(struct vendor) + strlen(name));

and avoid the "+1" for the terminator.

Yes, the modern way to do that is with a flexible array, and using
'offsetof()' instead of 'sizeof()', and adding the "+1" by hand.  That
also technically gets the size "more correct" in that it avoids any
alignment (and thus padding) issues, but this is another long-term
cleanup thing that will not happen for 5.7.

So disable the warning for now, even though it's potentially quite
useful.  Having a slew of warnings that then hide more urgent new issues
is not an improvement.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index daef13f382906..bc5e9a5fc5cbf 100644
--- a/Makefile
+++ b/Makefile
@@ -860,6 +860,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 
 # Enabled with W=2, disabled by default as noisy
 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
-- 
2.20.1

[PATCH AUTOSEL 5.6 57/62] gcc-10: disable 'stringop-overflow' warning for now

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit 5a76021c2eff7fcf2f0918a08fd8a37ce7922921 ]

This is the final array bounds warning removal for gcc-10 for now.

Again, the warning is good, and we should re-enable all these warnings
when we have converted all the legacy array declaration cases to
flexible arrays. But in the meantime, it's just noise.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index bc5e9a5fc5cbf..dde725d9c17d2 100644
--- a/Makefile
+++ b/Makefile
@@ -861,6 +861,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 # We'll want to enable this eventually, but it's not going away for 5.7 at least
 KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 
 # Enabled with W=2, disabled by default as noisy
 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
-- 
2.20.1

[PATCH AUTOSEL 5.6 58/62] gcc-10: disable 'restrict' warning for now

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit adc71920969870dfa54e8f40dac8616284832d02 ]

gcc-10 now warns about passing aliasing pointers to functions that take
restricted pointers.

That's actually a great warning, and if we ever start using 'restrict'
in the kernel, it might be quite useful.  But right now we don't, and it
turns out that the only thing this warns about is an idiom where we have
declared a few functions to be "printf-like" (which seems to make gcc
pick up the restricted pointer thing), and then we print to the same
buffer that we also use as an input.

And people do that as an odd concatenation pattern, with code like this:

    #define sysfs_show_gen_prop(buffer, fmt, ...) \
        snprintf(buffer, PAGE_SIZE, "%s"fmt, buffer, __VA_ARGS__)

where we have 'buffer' as both the destination of the final result, and
as the initial argument.

Yes, it's a bit questionable.  And outside of the kernel, people do have
standard declarations like

    int snprintf( char *restrict buffer, size_t bufsz,
                  const char *restrict format, ... );

where that output buffer is marked as a restrict pointer that cannot
alias with any other arguments.

But in the context of the kernel, that 'use snprintf() to concatenate to
the end result' does work, and the pattern shows up in multiple places.
And we have not marked our own version of snprintf() as taking restrict
pointers, so the warning is incorrect for now, and gcc picks it up on
its own.

If we do start using 'restrict' in the kernel (and it might be a good
idea if people find places where it matters), we'll need to figure out
how to avoid this issue for snprintf and friends.  But in the meantime,
this warning is not useful.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index dde725d9c17d2..c679a260f8ad3 100644
--- a/Makefile
+++ b/Makefile
@@ -863,6 +863,9 @@ KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
 KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
 
+# Another good warning that we'll want to enable eventually
+KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
+
 # Enabled with W=2, disabled by default as noisy
 KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
 
-- 
2.20.1

[PATCH AUTOSEL 5.6 59/62] gcc-10: mark more functions __init to avoid section mismatch warnings

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit e99332e7b4cda6e60f5b5916cf9943a79dbef902 ]

It seems that for whatever reason, gcc-10 ends up not inlining a couple
of functions that used to be inlined before.  Even if they only have one
single callsite - it looks like gcc may have decided that the code was
unlikely, and not worth inlining.

The code generation difference is harmless, but caused a few new section
mismatch errors, since the (now no longer inlined) function wasn't in
the __init section, but called other init functions:

   Section mismatch in reference from the function kexec_free_initrd() to the function .init.text:free_initrd_mem()
   Section mismatch in reference from the function tpm2_calc_event_log_size() to the function .init.text:early_memremap()
   Section mismatch in reference from the function tpm2_calc_event_log_size() to the function .init.text:early_memunmap()

So add the appropriate __init annotation to make modpost not complain.
In both cases there were trivially just a single callsite from another
__init function.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/firmware/efi/tpm.c | 2 +-
 init/initramfs.c           | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
index 31f9f0e369b97..55b031d2c9890 100644
--- a/drivers/firmware/efi/tpm.c
+++ b/drivers/firmware/efi/tpm.c
@@ -16,7 +16,7 @@
 int efi_tpm_final_log_size;
 EXPORT_SYMBOL(efi_tpm_final_log_size);
 
-static int tpm2_calc_event_log_size(void *data, int count, void *size_info)
+static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info)
 {
 	struct tcg_pcr_event2_head *header;
 	int event_size, size = 0;
diff --git a/init/initramfs.c b/init/initramfs.c
index 8ec1be4d7d512..7a38012e1af74 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -542,7 +542,7 @@ void __weak free_initrd_mem(unsigned long start, unsigned long end)
 }
 
 #ifdef CONFIG_KEXEC_CORE
-static bool kexec_free_initrd(void)
+static bool __init kexec_free_initrd(void)
 {
 	unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
 	unsigned long crashk_end   = (unsigned long)__va(crashk_res.end);
-- 
2.20.1

[PATCH AUTOSEL 5.6 60/62] crypto: lrw - simplify error handling in create()

[Sasha Levin]

From: Eric Biggers <ebiggers@google.com>

[ Upstream commit d57063103332b95eac9c118900f35700a491da08 ]

Simplify the error handling in the LRW template's ->create() function by
taking advantage of crypto_drop_skcipher() now accepting (as a no-op) a
spawn that hasn't been grabbed yet.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 crypto/lrw.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/crypto/lrw.c b/crypto/lrw.c
index 63c485c0d8a66..376d7ed3f1f87 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -343,15 +343,15 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 
 	err = -EINVAL;
 	if (alg->base.cra_blocksize != LRW_BLOCK_SIZE)
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	if (crypto_skcipher_alg_ivsize(alg))
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	err = crypto_inst_setname(skcipher_crypto_instance(inst), "lrw",
 				  &alg->base);
 	if (err)
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	err = -EINVAL;
 	cipher_name = alg->base.cra_name;
@@ -364,20 +364,20 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 
 		len = strlcpy(ecb_name, cipher_name + 4, sizeof(ecb_name));
 		if (len < 2 || len >= sizeof(ecb_name))
-			goto err_drop_spawn;
+			goto err_free_inst;
 
 		if (ecb_name[len - 1] != ')')
-			goto err_drop_spawn;
+			goto err_free_inst;
 
 		ecb_name[len - 1] = 0;
 
 		if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 			     "lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME) {
 			err = -ENAMETOOLONG;
-			goto err_drop_spawn;
+			goto err_free_inst;
 		}
 	} else
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 	inst->alg.base.cra_priority = alg->base.cra_priority;
@@ -403,17 +403,11 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->free = free;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto err_drop_spawn;
-
-out:
-	return err;
-
-err_drop_spawn:
-	crypto_drop_skcipher(spawn);
+	if (err) {
 err_free_inst:
-	kfree(inst);
-	goto out;
+		free(inst);
+	}
+	return err;
 }
 
 static struct crypto_template crypto_tmpl = {
-- 
2.20.1

[PATCH AUTOSEL 5.6 61/62] crypto: xts - simplify error handling in ->create()

[Sasha Levin]

From: Eric Biggers <ebiggers@google.com>

[ Upstream commit 732e540953477083082e999ff553622c59cffd5f ]

Simplify the error handling in the XTS template's ->create() function by
taking advantage of crypto_drop_skcipher() now accepting (as a no-op) a
spawn that hasn't been grabbed yet.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 crypto/xts.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/crypto/xts.c b/crypto/xts.c
index 29efa15f14954..dbdd8af629e69 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -379,15 +379,15 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 
 	err = -EINVAL;
 	if (alg->base.cra_blocksize != XTS_BLOCK_SIZE)
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	if (crypto_skcipher_alg_ivsize(alg))
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	err = crypto_inst_setname(skcipher_crypto_instance(inst), "xts",
 				  &alg->base);
 	if (err)
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	err = -EINVAL;
 	cipher_name = alg->base.cra_name;
@@ -400,20 +400,20 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 
 		len = strlcpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
 		if (len < 2 || len >= sizeof(ctx->name))
-			goto err_drop_spawn;
+			goto err_free_inst;
 
 		if (ctx->name[len - 1] != ')')
-			goto err_drop_spawn;
+			goto err_free_inst;
 
 		ctx->name[len - 1] = 0;
 
 		if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
 			     "xts(%s)", ctx->name) >= CRYPTO_MAX_ALG_NAME) {
 			err = -ENAMETOOLONG;
-			goto err_drop_spawn;
+			goto err_free_inst;
 		}
 	} else
-		goto err_drop_spawn;
+		goto err_free_inst;
 
 	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
 	inst->alg.base.cra_priority = alg->base.cra_priority;
@@ -437,17 +437,11 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->free = free;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto err_drop_spawn;
-
-out:
-	return err;
-
-err_drop_spawn:
-	crypto_drop_skcipher(&ctx->spawn);
+	if (err) {
 err_free_inst:
-	kfree(inst);
-	goto out;
+		free(inst);
+	}
+	return err;
 }
 
 static struct crypto_template crypto_tmpl = {
-- 
2.20.1

[PATCH AUTOSEL 5.6 62/62] gcc-10: avoid shadowing standard library 'free()' in crypto

[Sasha Levin]

From: Linus Torvalds <torvalds@linux-foundation.org>

[ Upstream commit 1a263ae60b04de959d9ce9caea4889385eefcc7b ]

gcc-10 has started warning about conflicting types for a few new
built-in functions, particularly 'free()'.

This results in warnings like:

   crypto/xts.c:325:13: warning: conflicting types for built-in function ‘free’; expected ‘void(void *)’ [-Wbuiltin-declaration-mismatch]

because the crypto layer had its local freeing functions called
'free()'.

Gcc-10 is in the wrong here, since that function is marked 'static', and
thus there is no chance of confusion with any standard library function
namespace.

But the simplest thing to do is to just use a different name here, and
avoid this gcc mis-feature.

[ Side note: gcc knowing about 'free()' is in itself not the
  mis-feature: the semantics of 'free()' are special enough that a
  compiler can validly do special things when seeing it.

  So the mis-feature here is that gcc thinks that 'free()' is some
  restricted name, and you can't shadow it as a local static function.

  Making the special 'free()' semantics be a function attribute rather
  than tied to the name would be the much better model ]

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 crypto/lrw.c | 6 +++---
 crypto/xts.c | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/crypto/lrw.c b/crypto/lrw.c
index 376d7ed3f1f87..3c734b81b3a20 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -287,7 +287,7 @@ static void exit_tfm(struct crypto_skcipher *tfm)
 	crypto_free_skcipher(ctx->child);
 }
 
-static void free(struct skcipher_instance *inst)
+static void free_inst(struct skcipher_instance *inst)
 {
 	crypto_drop_skcipher(skcipher_instance_ctx(inst));
 	kfree(inst);
@@ -400,12 +400,12 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.encrypt = encrypt;
 	inst->alg.decrypt = decrypt;
 
-	inst->free = free;
+	inst->free = free_inst;
 
 	err = skcipher_register_instance(tmpl, inst);
 	if (err) {
 err_free_inst:
-		free(inst);
+		free_inst(inst);
 	}
 	return err;
 }
diff --git a/crypto/xts.c b/crypto/xts.c
index dbdd8af629e69..6d8cea94b3cfb 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -322,7 +322,7 @@ static void exit_tfm(struct crypto_skcipher *tfm)
 	crypto_free_cipher(ctx->tweak);
 }
 
-static void free(struct skcipher_instance *inst)
+static void free_inst(struct skcipher_instance *inst)
 {
 	crypto_drop_skcipher(skcipher_instance_ctx(inst));
 	kfree(inst);
@@ -434,12 +434,12 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.encrypt = encrypt;
 	inst->alg.decrypt = decrypt;
 
-	inst->free = free;
+	inst->free = free_inst;
 
 	err = skcipher_register_instance(tmpl, inst);
 	if (err) {
 err_free_inst:
-		free(inst);
+		free_inst(inst);
 	}
 	return err;
 }
-- 
2.20.1