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* Re: [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver
  2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
@ 2018-10-29 10:15 ` Andy Shevchenko
       [not found]   ` <201810291843424704356@zte.com.cn>
  2018-10-29 11:32 ` [PATCH V3 2/5] misc/pvpanic : convert to SPDX license tags Peng Hao
                   ` (3 subsequent siblings)
  4 siblings, 1 reply; 11+ messages in thread
From: Andy Shevchenko @ 2018-10-29 10:15 UTC (permalink / raw)
  To: peng.hao2
  Cc: Rob Herring, Mark Rutland, Arnd Bergmann, Greg Kroah-Hartman,
	Andy Shevchenko, Darren Hart, Linux Kernel Mailing List,
	Platform Driver, hutao, Linux Documentation List

On Mon, Oct 29, 2018 at 5:22 AM Peng Hao <peng.hao2@zte.com.cn> wrote:
>
> move pvpanic.c from drivers/platform/x86 to drivers/misc.
> following patches will use pvpanic device in arm64.
>
> Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
> ---
>  drivers/misc/Kconfig           |   7 +++
>  drivers/misc/Makefile          |   1 +
>  drivers/misc/pvpanic.c         | 124 +++++++++++++++++++++++++++++++++++++++++
>  drivers/platform/Kconfig       |   3 +
>  drivers/platform/Makefile      |   1 +
>  drivers/platform/x86/Kconfig   |   8 ---
>  drivers/platform/x86/Makefile  |   1 -
>  drivers/platform/x86/pvpanic.c | 124 -----------------------------------------

As I mentioned you better to use -C -M.
This is currently a bit hard to review.

-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [PATCH V3 3/5] misc/pvpanic: add MMIO support
  2018-10-29 11:32 ` [PATCH V3 3/5] misc/pvpanic: add MMIO support Peng Hao
@ 2018-10-29 10:30   ` Andy Shevchenko
       [not found]     ` <201810291854235724652@zte.com.cn>
  0 siblings, 1 reply; 11+ messages in thread
From: Andy Shevchenko @ 2018-10-29 10:30 UTC (permalink / raw)
  To: peng.hao2
  Cc: Rob Herring, Mark Rutland, Arnd Bergmann, Greg Kroah-Hartman,
	Andy Shevchenko, Darren Hart, Linux Kernel Mailing List,
	Platform Driver, hutao, Linux Documentation List

On Mon, Oct 29, 2018 at 5:22 AM Peng Hao <peng.hao2@zte.com.cn> wrote:
>
> On some architectures (e.g. arm64), it's preferable to use MMIO, since
> this can be used standalone. Add MMIO support to the pvpanic driver.

>  pvpanic_walk_resources(struct acpi_resource *res, void *context)
>  {
> +       struct acpi_resource_fixed_memory32 *fixmem32;
> +
>         switch (res->type) {
>         case ACPI_RESOURCE_TYPE_END_TAG:
>                 return AE_OK;
>
>         case ACPI_RESOURCE_TYPE_IO:
> -               port = res->data.io.minimum;
> +               base = (void __iomem *) ioport_map(res->data.io.minimum, 1);
> +               return AE_OK;
> +
> +       case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
> +               fixmem32 = &res->data.fixed_memory32;
> +               base = ioremap(fixmem32->address, fixmem32->address_length);
>                 return AE_OK;

Ouch. Sorry, I forgot to look at this previously.

This should be converted to use
acpi_dev_resource_io()
acpi_dev_resource_memory()

-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH V3 1/5]  pvpanic: move pvpanic to misc as common driver
@ 2018-10-29 11:32 Peng Hao
  2018-10-29 10:15 ` Andy Shevchenko
                   ` (4 more replies)
  0 siblings, 5 replies; 11+ messages in thread
From: Peng Hao @ 2018-10-29 11:32 UTC (permalink / raw)
  To: robh+dt, mark.rutland, arnd, gregkh, andy, dvhart
  Cc: linux-kernel, platform-driver-x86, hutao, linux-doc, Peng Hao

move pvpanic.c from drivers/platform/x86 to drivers/misc.
following patches will use pvpanic device in arm64.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/Kconfig           |   7 +++
 drivers/misc/Makefile          |   1 +
 drivers/misc/pvpanic.c         | 124 +++++++++++++++++++++++++++++++++++++++++
 drivers/platform/Kconfig       |   3 +
 drivers/platform/Makefile      |   1 +
 drivers/platform/x86/Kconfig   |   8 ---
 drivers/platform/x86/Makefile  |   1 -
 drivers/platform/x86/pvpanic.c | 124 -----------------------------------------
 8 files changed, 136 insertions(+), 133 deletions(-)
 create mode 100644 drivers/misc/pvpanic.c
 delete mode 100644 drivers/platform/x86/pvpanic.c

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 5d71300..ca55c94 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -499,6 +499,13 @@ config MISC_RTSX
 	tristate
 	default MISC_RTSX_PCI || MISC_RTSX_USB
 
+config PVPANIC
+	tristate "pvpanic device support"
+	help
+          This driver provides support for the pvpanic device.  pvpanic is
+          a paravirtualized device provided by QEMU; it lets a virtual machine
+          (guest) communicate panic events to the host.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 20be70c..39dc005 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -57,3 +57,4 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP)	+= aspeed-lpc-snoop.o
 obj-$(CONFIG_PCI_ENDPOINT_TEST)	+= pci_endpoint_test.o
 obj-$(CONFIG_OCXL)		+= ocxl/
 obj-$(CONFIG_MISC_RTSX)		+= cardreader/
+obj-$(CONFIG_PVPANIC)  		+= pvpanic.o
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
new file mode 100644
index 0000000..fd86dab
--- /dev/null
+++ b/drivers/misc/pvpanic.c
@@ -0,0 +1,124 @@
+/*
+ *  pvpanic.c - pvpanic Device Support
+ *
+ *  Copyright (C) 2013 Fujitsu.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+
+MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
+MODULE_DESCRIPTION("pvpanic device driver");
+MODULE_LICENSE("GPL");
+
+static int pvpanic_add(struct acpi_device *device);
+static int pvpanic_remove(struct acpi_device *device);
+
+static const struct acpi_device_id pvpanic_device_ids[] = {
+	{ "QEMU0001", 0 },
+	{ "", 0 },
+};
+MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
+
+#define PVPANIC_PANICKED	(1 << 0)
+
+static u16 port;
+
+static struct acpi_driver pvpanic_driver = {
+	.name =		"pvpanic",
+	.class =	"QEMU",
+	.ids =		pvpanic_device_ids,
+	.ops =		{
+				.add =		pvpanic_add,
+				.remove =	pvpanic_remove,
+			},
+	.owner =	THIS_MODULE,
+};
+
+static void
+pvpanic_send_event(unsigned int event)
+{
+	outb(event, port);
+}
+
+static int
+pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
+		     void *unused)
+{
+	pvpanic_send_event(PVPANIC_PANICKED);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block pvpanic_panic_nb = {
+	.notifier_call = pvpanic_panic_notify,
+	.priority = 1, /* let this called before broken drm_fb_helper */
+};
+
+
+static acpi_status
+pvpanic_walk_resources(struct acpi_resource *res, void *context)
+{
+	switch (res->type) {
+	case ACPI_RESOURCE_TYPE_END_TAG:
+		return AE_OK;
+
+	case ACPI_RESOURCE_TYPE_IO:
+		port = res->data.io.minimum;
+		return AE_OK;
+
+	default:
+		return AE_ERROR;
+	}
+}
+
+static int pvpanic_add(struct acpi_device *device)
+{
+	int ret;
+
+	ret = acpi_bus_get_status(device);
+	if (ret < 0)
+		return ret;
+
+	if (!device->status.enabled || !device->status.functional)
+		return -ENODEV;
+
+	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+			    pvpanic_walk_resources, NULL);
+
+	if (!port)
+		return -ENODEV;
+
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &pvpanic_panic_nb);
+
+	return 0;
+}
+
+static int pvpanic_remove(struct acpi_device *device)
+{
+
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &pvpanic_panic_nb);
+	return 0;
+}
+
+module_acpi_driver(pvpanic_driver);
diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
index d4c2e42..8b64b78 100644
--- a/drivers/platform/Kconfig
+++ b/drivers/platform/Kconfig
@@ -1,3 +1,6 @@
+if ARM64
+source "drivers/platform/arm/Kconfig"
+endif
 if X86
 source "drivers/platform/x86/Kconfig"
 endif
diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile
index 4b2ce58..232231c 100644
--- a/drivers/platform/Makefile
+++ b/drivers/platform/Makefile
@@ -3,6 +3,7 @@
 # Makefile for linux/drivers/platform
 #
 
+obj-$(CONFIG_ARM64)               += arm/
 obj-$(CONFIG_X86)		+= x86/
 obj-$(CONFIG_MELLANOX_PLATFORM)	+= mellanox/
 obj-$(CONFIG_MIPS)		+= mips/
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index ef016e4..a6b412e 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1119,14 +1119,6 @@ config INTEL_SMARTCONNECT
 	  This driver checks to determine whether the device has Intel Smart
 	  Connect enabled, and if so disables it.
 
-config PVPANIC
-	tristate "pvpanic device support"
-	depends on ACPI
-	---help---
-	  This driver provides support for the pvpanic device.  pvpanic is
-	  a paravirtualized device provided by QEMU; it lets a virtual machine
-	  (guest) communicate panic events to the host.
-
 config INTEL_PMC_IPC
 	tristate "Intel PMC IPC Driver"
 	depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 2ba6cb7..a4ec299 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -75,7 +75,6 @@ obj-$(CONFIG_APPLE_GMUX)	+= apple-gmux.o
 obj-$(CONFIG_INTEL_RST)		+= intel-rst.o
 obj-$(CONFIG_INTEL_SMARTCONNECT)	+= intel-smartconnect.o
 
-obj-$(CONFIG_PVPANIC)           += pvpanic.o
 obj-$(CONFIG_ALIENWARE_WMI)	+= alienware-wmi.o
 obj-$(CONFIG_INTEL_PMC_IPC)	+= intel_pmc_ipc.o
 obj-$(CONFIG_SILEAD_DMI)	+= silead_dmi.o
diff --git a/drivers/platform/x86/pvpanic.c b/drivers/platform/x86/pvpanic.c
deleted file mode 100644
index fd86dab..0000000
--- a/drivers/platform/x86/pvpanic.c
+++ /dev/null
@@ -1,124 +0,0 @@
-/*
- *  pvpanic.c - pvpanic Device Support
- *
- *  Copyright (C) 2013 Fujitsu.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/acpi.h>
-
-MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
-MODULE_DESCRIPTION("pvpanic device driver");
-MODULE_LICENSE("GPL");
-
-static int pvpanic_add(struct acpi_device *device);
-static int pvpanic_remove(struct acpi_device *device);
-
-static const struct acpi_device_id pvpanic_device_ids[] = {
-	{ "QEMU0001", 0 },
-	{ "", 0 },
-};
-MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
-
-#define PVPANIC_PANICKED	(1 << 0)
-
-static u16 port;
-
-static struct acpi_driver pvpanic_driver = {
-	.name =		"pvpanic",
-	.class =	"QEMU",
-	.ids =		pvpanic_device_ids,
-	.ops =		{
-				.add =		pvpanic_add,
-				.remove =	pvpanic_remove,
-			},
-	.owner =	THIS_MODULE,
-};
-
-static void
-pvpanic_send_event(unsigned int event)
-{
-	outb(event, port);
-}
-
-static int
-pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
-		     void *unused)
-{
-	pvpanic_send_event(PVPANIC_PANICKED);
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block pvpanic_panic_nb = {
-	.notifier_call = pvpanic_panic_notify,
-	.priority = 1, /* let this called before broken drm_fb_helper */
-};
-
-
-static acpi_status
-pvpanic_walk_resources(struct acpi_resource *res, void *context)
-{
-	switch (res->type) {
-	case ACPI_RESOURCE_TYPE_END_TAG:
-		return AE_OK;
-
-	case ACPI_RESOURCE_TYPE_IO:
-		port = res->data.io.minimum;
-		return AE_OK;
-
-	default:
-		return AE_ERROR;
-	}
-}
-
-static int pvpanic_add(struct acpi_device *device)
-{
-	int ret;
-
-	ret = acpi_bus_get_status(device);
-	if (ret < 0)
-		return ret;
-
-	if (!device->status.enabled || !device->status.functional)
-		return -ENODEV;
-
-	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
-			    pvpanic_walk_resources, NULL);
-
-	if (!port)
-		return -ENODEV;
-
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &pvpanic_panic_nb);
-
-	return 0;
-}
-
-static int pvpanic_remove(struct acpi_device *device)
-{
-
-	atomic_notifier_chain_unregister(&panic_notifier_list,
-					 &pvpanic_panic_nb);
-	return 0;
-}
-
-module_acpi_driver(pvpanic_driver);
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH V3 2/5]  misc/pvpanic : convert to SPDX license tags
  2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
  2018-10-29 10:15 ` Andy Shevchenko
@ 2018-10-29 11:32 ` Peng Hao
  2018-10-29 11:32 ` [PATCH V3 3/5] misc/pvpanic: add MMIO support Peng Hao
                   ` (2 subsequent siblings)
  4 siblings, 0 replies; 11+ messages in thread
From: Peng Hao @ 2018-10-29 11:32 UTC (permalink / raw)
  To: robh+dt, mark.rutland, arnd, gregkh, andy, dvhart
  Cc: linux-kernel, platform-driver-x86, hutao, linux-doc, Peng Hao

This patch updates license to use SPDX-License-Identifier
instead of verbose license text.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/pvpanic.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index fd86dab..9450376 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -1,21 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
- *  pvpanic.c - pvpanic Device Support
+ *  Pvpanic Device Support
  *
  *  Copyright (C) 2013 Fujitsu.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH V3 3/5]  misc/pvpanic: add MMIO support
  2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
  2018-10-29 10:15 ` Andy Shevchenko
  2018-10-29 11:32 ` [PATCH V3 2/5] misc/pvpanic : convert to SPDX license tags Peng Hao
@ 2018-10-29 11:32 ` Peng Hao
  2018-10-29 10:30   ` Andy Shevchenko
  2018-10-29 11:32 ` [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
  2018-10-29 11:32 ` [PATCH 5/5] dt-bindings/misc/pvpanic :add document for pvpanic-mmio Peng Hao
  4 siblings, 1 reply; 11+ messages in thread
From: Peng Hao @ 2018-10-29 11:32 UTC (permalink / raw)
  To: robh+dt, mark.rutland, arnd, gregkh, andy, dvhart
  Cc: linux-kernel, platform-driver-x86, hutao, linux-doc, Peng Hao

On some architectures (e.g. arm64), it's preferable to use MMIO, since
this can be used standalone. Add MMIO support to the pvpanic driver.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/pvpanic.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index 9450376..cfd7fef 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -28,7 +28,7 @@
 
 #define PVPANIC_PANICKED	(1 << 0)
 
-static u16 port;
+static void __iomem *base;
 
 static struct acpi_driver pvpanic_driver = {
 	.name =		"pvpanic",
@@ -44,7 +44,7 @@
 static void
 pvpanic_send_event(unsigned int event)
 {
-	outb(event, port);
+	iowrite8(event, base);
 }
 
 static int
@@ -64,12 +64,19 @@
 static acpi_status
 pvpanic_walk_resources(struct acpi_resource *res, void *context)
 {
+	struct acpi_resource_fixed_memory32 *fixmem32;
+
 	switch (res->type) {
 	case ACPI_RESOURCE_TYPE_END_TAG:
 		return AE_OK;
 
 	case ACPI_RESOURCE_TYPE_IO:
-		port = res->data.io.minimum;
+		base = (void __iomem *) ioport_map(res->data.io.minimum, 1);
+		return AE_OK;
+
+	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+		fixmem32 = &res->data.fixed_memory32;
+		base = ioremap(fixmem32->address, fixmem32->address_length);
 		return AE_OK;
 
 	default:
@@ -91,7 +98,7 @@ static int pvpanic_add(struct acpi_device *device)
 	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 			    pvpanic_walk_resources, NULL);
 
-	if (!port)
+	if (!base)
 		return -ENODEV;
 
 	atomic_notifier_chain_register(&panic_notifier_list,
@@ -105,6 +112,9 @@ static int pvpanic_remove(struct acpi_device *device)
 
 	atomic_notifier_chain_unregister(&panic_notifier_list,
 					 &pvpanic_panic_nb);
+
+	iounmap(base);
+
 	return 0;
 }
 
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH V4 4/5]  misc/pvpanic: add support to get pvpanic device info by FDT
  2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
                   ` (2 preceding siblings ...)
  2018-10-29 11:32 ` [PATCH V3 3/5] misc/pvpanic: add MMIO support Peng Hao
@ 2018-10-29 11:32 ` Peng Hao
  2018-10-29 11:37   ` Andy Shevchenko
  2018-10-29 11:32 ` [PATCH 5/5] dt-bindings/misc/pvpanic :add document for pvpanic-mmio Peng Hao
  4 siblings, 1 reply; 11+ messages in thread
From: Peng Hao @ 2018-10-29 11:32 UTC (permalink / raw)
  To: robh+dt, mark.rutland, arnd, gregkh, andy, dvhart
  Cc: linux-kernel, platform-driver-x86, hutao, linux-doc, Peng Hao

By default, when ACPI tables and FDT coexist for ARM64,
current kernel takes precedence over FDT to get device information.
Virt machine in qemu provides both FDT and ACPI table. This patch
increases the way to get information through FDT.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/pvpanic.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 62 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index cfd7fef..eb1ed0f 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -3,15 +3,19 @@
  *  Pvpanic Device Support
  *
  *  Copyright (C) 2013 Fujitsu.
+ *  Copyright (C) 2018 ZTE.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/acpi.h>
+#include <linux/of.h>
 
 MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
 MODULE_DESCRIPTION("pvpanic device driver");
@@ -60,6 +64,32 @@
 	.priority = 1, /* let this called before broken drm_fb_helper */
 };
 
+static int pvpanic_mmio_probe(struct platform_device *pdev)
+{
+	struct resource *mem;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -EINVAL;
+
+	base = devm_ioremap_resource(&pdev->dev, mem);
+	if (base == NULL)
+		return -EFAULT;
+
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &pvpanic_panic_nb);
+
+	return 0;
+}
+
+static int pvpanic_mmio_remove(struct platform_device *pdev)
+{
+
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &pvpanic_panic_nb);
+
+	return 0;
+}
 
 static acpi_status
 pvpanic_walk_resources(struct acpi_resource *res, void *context)
@@ -118,4 +148,35 @@ static int pvpanic_remove(struct acpi_device *device)
 	return 0;
 }
 
-module_acpi_driver(pvpanic_driver);
+static const struct of_device_id pvpanic_mmio_match[] = {
+	{ .compatible = "qemu,pvpanic-mmio", },
+	{}
+};
+
+static struct platform_driver pvpanic_mmio_driver = {
+	.driver = {
+		.name = "pvpanic-mmio",
+		.of_match_table = pvpanic_mmio_match,
+	},
+	.probe = pvpanic_mmio_probe,
+	.remove = pvpanic_mmio_remove,
+};
+
+static int __init pvpanic_mmio_init(void)
+{
+	if (acpi_disabled)
+		return platform_driver_register(&pvpanic_mmio_driver);
+	else
+		return acpi_bus_register_driver(&pvpanic_driver);
+}
+
+static void __exit pvpanic_mmio_exit(void)
+{
+	if (acpi_disabled)
+		platform_driver_unregister(&pvpanic_mmio_driver);
+	else
+		acpi_bus_unregister_driver(&pvpanic_driver);
+}
+
+module_init(pvpanic_mmio_init);
+module_exit(pvpanic_mmio_exit);
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 11+ messages in thread

* [PATCH 5/5]  dt-bindings/misc/pvpanic :add document for pvpanic-mmio
  2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
                   ` (3 preceding siblings ...)
  2018-10-29 11:32 ` [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
@ 2018-10-29 11:32 ` Peng Hao
  4 siblings, 0 replies; 11+ messages in thread
From: Peng Hao @ 2018-10-29 11:32 UTC (permalink / raw)
  To: robh+dt, mark.rutland, arnd, gregkh, andy, dvhart
  Cc: linux-kernel, platform-driver-x86, hutao, linux-doc, Peng Hao

Add dt-bindings document for "qemu:pvpanic-mmio".

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 .../devicetree/bindings/misc/pvpanic-mmio.txt      | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/pvpanic-mmio.txt

diff --git a/Documentation/devicetree/bindings/misc/pvpanic-mmio.txt b/Documentation/devicetree/bindings/misc/pvpanic-mmio.txt
new file mode 100644
index 0000000..3db6d19
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/pvpanic-mmio.txt
@@ -0,0 +1,29 @@
+* QEMU PVPANIC MMIO Configuration bindings
+
+QEMU's emulation / virtualization targets provide the following PVPANIC
+MMIO Configuration interface on the "virt" machine.
+type:
+
+- a read-write, 16-bit wide data register.
+
+QEMU exposes the data register to guests as memory mapped registers.
+
+Required properties:
+
+- compatible: "qemu,pvpanic-mmio".
+- reg: the MMIO region used by the device.
+  * Bytes 0x0  Write panic event to the reg when guest OS panics.
+  * Bytes 0x1  Reserved.
+
+Example:
+
+/ {
+        #size-cells = <0x2>;
+        #address-cells = <0x2>;
+
+        pvpanic-mmio@9060000 {
+                compatible = "qemu,pvpanic-mmio";
+                reg = <0x0 0x9060000 0x0 0x2>;
+        };
+};
+
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 11+ messages in thread

* Re: [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT
  2018-10-29 11:32 ` [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
@ 2018-10-29 11:37   ` Andy Shevchenko
  0 siblings, 0 replies; 11+ messages in thread
From: Andy Shevchenko @ 2018-10-29 11:37 UTC (permalink / raw)
  To: peng.hao2
  Cc: Rob Herring, Mark Rutland, Arnd Bergmann, Greg Kroah-Hartman,
	Andy Shevchenko, Darren Hart, Linux Kernel Mailing List,
	Platform Driver, hutao, Linux Documentation List

On Mon, Oct 29, 2018 at 5:22 AM Peng Hao <peng.hao2@zte.com.cn> wrote:
>
> By default, when ACPI tables and FDT coexist for ARM64,
> current kernel takes precedence over FDT to get device information.
> Virt machine in qemu provides both FDT and ACPI table. This patch
> increases the way to get information through FDT.
>

This one looks good to me!
Though, see one comment below.

> Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
> ---
>  drivers/misc/pvpanic.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 62 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
> index cfd7fef..eb1ed0f 100644
> --- a/drivers/misc/pvpanic.c
> +++ b/drivers/misc/pvpanic.c
> @@ -3,15 +3,19 @@
>   *  Pvpanic Device Support
>   *
>   *  Copyright (C) 2013 Fujitsu.
> + *  Copyright (C) 2018 ZTE.
>   */
>
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <linux/platform_device.h>
> +#include <linux/of_address.h>
>  #include <linux/kernel.h>

>  #include <linux/module.h>
>  #include <linux/init.h>

Side note: one of the above is redundant (either it can be built as
module -> module.h or not -> init.h)

>  #include <linux/types.h>
>  #include <linux/acpi.h>
> +#include <linux/of.h>

I think alphabetical order is slightly better, though there are
developers who think differently.

>
>  MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
>  MODULE_DESCRIPTION("pvpanic device driver");
> @@ -60,6 +64,32 @@
>         .priority = 1, /* let this called before broken drm_fb_helper */
>  };
>
> +static int pvpanic_mmio_probe(struct platform_device *pdev)
> +{
> +       struct resource *mem;
> +
> +       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (!mem)
> +               return -EINVAL;
> +
> +       base = devm_ioremap_resource(&pdev->dev, mem);
> +       if (base == NULL)
> +               return -EFAULT;
> +
> +       atomic_notifier_chain_register(&panic_notifier_list,
> +                                      &pvpanic_panic_nb);
> +
> +       return 0;
> +}
> +
> +static int pvpanic_mmio_remove(struct platform_device *pdev)
> +{
> +
> +       atomic_notifier_chain_unregister(&panic_notifier_list,
> +                                        &pvpanic_panic_nb);
> +
> +       return 0;
> +}
>
>  static acpi_status
>  pvpanic_walk_resources(struct acpi_resource *res, void *context)
> @@ -118,4 +148,35 @@ static int pvpanic_remove(struct acpi_device *device)
>         return 0;
>  }
>
> -module_acpi_driver(pvpanic_driver);
> +static const struct of_device_id pvpanic_mmio_match[] = {
> +       { .compatible = "qemu,pvpanic-mmio", },
> +       {}
> +};
> +
> +static struct platform_driver pvpanic_mmio_driver = {
> +       .driver = {
> +               .name = "pvpanic-mmio",
> +               .of_match_table = pvpanic_mmio_match,
> +       },
> +       .probe = pvpanic_mmio_probe,
> +       .remove = pvpanic_mmio_remove,
> +};
> +
> +static int __init pvpanic_mmio_init(void)
> +{
> +       if (acpi_disabled)
> +               return platform_driver_register(&pvpanic_mmio_driver);
> +       else
> +               return acpi_bus_register_driver(&pvpanic_driver);
> +}
> +
> +static void __exit pvpanic_mmio_exit(void)
> +{
> +       if (acpi_disabled)
> +               platform_driver_unregister(&pvpanic_mmio_driver);
> +       else
> +               acpi_bus_unregister_driver(&pvpanic_driver);
> +}
> +
> +module_init(pvpanic_mmio_init);
> +module_exit(pvpanic_mmio_exit);
> --
> 1.8.3.1
>


-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: Re: [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver
       [not found]   ` <201810291843424704356@zte.com.cn>
@ 2018-10-29 11:37     ` Andy Shevchenko
  0 siblings, 0 replies; 11+ messages in thread
From: Andy Shevchenko @ 2018-10-29 11:37 UTC (permalink / raw)
  To: peng.hao2
  Cc: Rob Herring, Mark Rutland, Arnd Bergmann, Greg Kroah-Hartman,
	Andy Shevchenko, Darren Hart, Linux Kernel Mailing List,
	Platform Driver, hutao, Linux Documentation List

On Mon, Oct 29, 2018 at 12:43 PM <peng.hao2@zte.com.cn> wrote:
>
> >On Mon, Oct 29, 2018 at 5:22 AM Peng Hao <peng.hao2@zte.com.cn> wrote:
> >>
> >> move pvpanic.c from drivers/platform/x86 to drivers/misc.
> >> following patches will use pvpanic device in arm64.
> >>
> > Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
> >> ---
> >>  drivers/misc/Kconfig           |   7 +++
> >>  drivers/misc/Makefile          |   1 +
> >>  drivers/misc/pvpanic.c         | 124 +++++++++++++++++++++++++++++++++++++++++
> >>  drivers/platform/Kconfig       |   3 +
> >>  drivers/platform/Makefile      |   1 +
> >>  drivers/platform/x86/Kconfig   |   8 ---
> >>  drivers/platform/x86/Makefile  |   1 -
> >>  drivers/platform/x86/pvpanic.c | 124 -----------------------------------------
> >
> >As I mentioned you better to use -C -M.
> >This is currently a bit hard to review.
>
> sorry, I don't understand what "-C -M" means.
> I should have asked you when you first mention it.

git format-patch -C -M ...

-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: [PATCH V3 3/5] misc/pvpanic: add MMIO support
       [not found]     ` <201810291854235724652@zte.com.cn>
@ 2018-10-29 11:57       ` Andy Shevchenko
       [not found]         ` <201810301107515541204@zte.com.cn>
  0 siblings, 1 reply; 11+ messages in thread
From: Andy Shevchenko @ 2018-10-29 11:57 UTC (permalink / raw)
  To: peng.hao2
  Cc: Rob Herring, Mark Rutland, Arnd Bergmann, Greg Kroah-Hartman,
	Andy Shevchenko, Darren Hart, Linux Kernel Mailing List,
	Platform Driver, hutao, Linux Documentation List

On Mon, Oct 29, 2018 at 12:54 PM <peng.hao2@zte.com.cn> wrote:
>
> >On Mon, Oct 29, 2018 at 5:22 AM Peng Hao <peng.hao2@zte.com.cn> wrote:
> >>
> >> On some architectures (e.g. arm64), it's preferable to use MMIO, since
> >> this can be used standalone. Add MMIO support to the pvpanic driver.
> >
> >>  pvpanic_walk_resources(struct acpi_resource *res, void *context)
> >>  {
> >> +       struct acpi_resource_fixed_memory32 *fixmem32;
> >> +
> >>         switch (res->type) {
> >>         case ACPI_RESOURCE_TYPE_END_TAG:
> >>                 return AE_OK;
> >>
> >>         case ACPI_RESOURCE_TYPE_IO:
> >> -               port = res->data.io.minimum;
> >> +               base = (void __iomem *) ioport_map(res->data.io.minimum, 1);
> >> +               return AE_OK;
> >> +
> >> +       case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
> >> +               fixmem32 = &res->data.fixed_memory32;
> >> +               base = ioremap(fixmem32->address, fixmem32->address_length);
> >>                 return AE_OK;
> >
> >Ouch. Sorry, I forgot to look at this previously.
> >
> >This should be converted to use
> >acpi_dev_resource_io()
> >acpi_dev_resource_memory()
> >
> another question, here:
> iounmap(base) and base may be a ioport. I read x86 code for iounmap that  checked the base.
> so I think it is safe for x86. But I'm not sure if other architectures using ioport are also secure
> in the same way of processing.
> Do you have any suggestions?

I would consider it as a bug if on some architectures iounmap() is not
able to take a base got from ioport_map().

-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 11+ messages in thread

* Re: Re: [PATCH V3 3/5] misc/pvpanic: add MMIO support
       [not found]         ` <201810301107515541204@zte.com.cn>
@ 2018-10-30  9:54           ` Andy Shevchenko
  0 siblings, 0 replies; 11+ messages in thread
From: Andy Shevchenko @ 2018-10-30  9:54 UTC (permalink / raw)
  To: peng.hao2
  Cc: Rob Herring, Mark Rutland, Arnd Bergmann, Greg Kroah-Hartman,
	Andy Shevchenko, Darren Hart, Linux Kernel Mailing List,
	Platform Driver, hutao, Linux Documentation List

On Tue, Oct 30, 2018 at 5:08 AM <peng.hao2@zte.com.cn> wrote:
> >On Mon, Oct 29, 2018 at 12:54 PM <peng.hao2@zte.com.cn> wrote:

> >I would consider it as a bug if on some architectures iounmap() is not
> >able to take a base got from ioport_map().

> I added TYPE_PVPANIC_MMIO in QEMU to the architecture that does not support IOPORT.
>  If some architectures does not support IOPORT, set TYPE_PVPANIC_MMIO in qemu. This setting is reflected in the kernel pvpanic driver
> and does not invoke ioport_map (calling ioremap).  So I think the situation you described above will not happen.

> But I should  resume one check like this to deal with the failure of ioremap/ioport_map.
>      if (base)
>            iounmap(base)

I'm a bit confused, how come that base == NULL when you about to call
iounmap()? Where you would like to put this check?

> The patch of QEMU is still in review.

-- 
With Best Regards,
Andy Shevchenko

^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2018-10-30  9:54 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
2018-10-29 10:15 ` Andy Shevchenko
     [not found]   ` <201810291843424704356@zte.com.cn>
2018-10-29 11:37     ` Andy Shevchenko
2018-10-29 11:32 ` [PATCH V3 2/5] misc/pvpanic : convert to SPDX license tags Peng Hao
2018-10-29 11:32 ` [PATCH V3 3/5] misc/pvpanic: add MMIO support Peng Hao
2018-10-29 10:30   ` Andy Shevchenko
     [not found]     ` <201810291854235724652@zte.com.cn>
2018-10-29 11:57       ` Andy Shevchenko
     [not found]         ` <201810301107515541204@zte.com.cn>
2018-10-30  9:54           ` Andy Shevchenko
2018-10-29 11:32 ` [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
2018-10-29 11:37   ` Andy Shevchenko
2018-10-29 11:32 ` [PATCH 5/5] dt-bindings/misc/pvpanic :add document for pvpanic-mmio Peng Hao

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