* [PATCH v9 00/11] vgaarb: Rework default VGA device selection
@ 2022-02-24 22:47 Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 01/11] PCI/VGA: Move vgaarb to drivers/pci Bjorn Helgaas
` (11 more replies)
0 siblings, 12 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bjorn Helgaas
From: Bjorn Helgaas <bhelgaas@google.com>
Current default VGA device selection fails in some cases because part of it
is done in the vga_arb_device_init() subsys_initcall, and some arches
enumerate PCI devices in pcibios_init(), which runs *after* that.
The big change from the v8 posting is that this moves vgaarb.c from
drivers/gpu/vga to drivers/pci because it really has nothing to do with
GPUs or DRM.
For example:
- On BMC system, the AST2500 bridge [1a03:1150] does not implement
PCI_BRIDGE_CTL_VGA. This is perfectly legal but means the legacy VGA
resources won't reach downstream devices unless they're included in the
usual bridge windows.
- vga_arb_select_default_device() will set a device below such a bridge
as the default VGA device as long as it has PCI_COMMAND_IO and
PCI_COMMAND_MEMORY enabled.
- vga_arbiter_add_pci_device() is called for every VGA device, either at
boot-time or at hot-add time, and it will also set the device as the
default VGA device, but ONLY if all bridges leading to it implement
PCI_BRIDGE_CTL_VGA.
- This difference between vga_arb_select_default_device() and
vga_arbiter_add_pci_device() means that a device below an AST2500 or
similar bridge can only be set as the default if it is enumerated
before vga_arb_device_init().
- On ACPI-based systems, PCI devices are enumerated by acpi_init(), which
runs before vga_arb_device_init().
- On non-ACPI systems, like on MIPS system, they are enumerated by
pcibios_init(), which typically runs *after* vga_arb_device_init().
This series consolidates all the default VGA device selection in
vga_arbiter_add_pci_device(), which is always called after enumerating a
PCI device.
Almost all the work here is Huacai's. I restructured it a little bit and
added a few trivial patches on top.
Bjorn
Version history:
V0 original implementation as final quirk to set default device.
https://lore.kernel.org/r/20210514080025.1828197-6-chenhuacai@loongson.cn
V1 rework vgaarb to do all default device selection in
vga_arbiter_add_pci_device().
https://lore.kernel.org/r/20210705100503.1120643-1-chenhuacai@loongson.cn
V2 move arbiter to PCI subsystem, fix nits.
https://lore.kernel.org/r/20210722212920.347118-1-helgaas@kernel.org
V3 rewrite the commit log of the last patch (which is also summarized
by Bjorn).
https://lore.kernel.org/r/20210820100832.663931-1-chenhuacai@loongson.cn
V4 split the last patch to two steps.
https://lore.kernel.org/r/20210827083129.2781420-1-chenhuacai@loongson.cn
V5 split Patch-9 again and sort the patches.
https://lore.kernel.org/r/20210911093056.1555274-1-chenhuacai@loongson.cn
V6 split Patch-5 again and sort the patches again.
https://lore.kernel.org/r/20210916082941.3421838-1-chenhuacai@loongson.cn
V7 stop moving vgaarb to drivers/pci because of ordering issues with
misc_init().
https://lore.kernel.org/r/20211015061512.2941859-1-chenhuacai@loongson.cn
https://lore.kernel.org/r/CAAhV-H7FhAjM-Ha42Z1dLrE4PvC9frfyeU27KHWcyWKkMftEsA@mail.gmail.com
V8 expand commit logs, rework boot VGA device selection
https://lore.kernel.org/r/20220106000658.243509-1-helgaas@kernel.org
V9 (this posting) move to drivers/pci, resolve initcall ordering, rename
vga_is_framebuffer_device() to vga_is_firmware_default()
Bjorn Helgaas (5):
PCI/VGA: Move vgaarb to drivers/pci
PCI/VGA: Factor out vga_select_framebuffer_device()
PCI/VGA: Remove empty vga_arb_device_card_gone()
PCI/VGA: Use unsigned format string to print lock counts
PCI/VGA: Replace full MIT license text with SPDX identifier
Huacai Chen (6):
PCI/VGA: Move vga_arb_integrated_gpu() earlier in file
PCI/VGA: Factor out default VGA device selection
PCI/VGA: Move firmware default device detection to ADD_DEVICE path
PCI/VGA: Move non-legacy VGA detection to ADD_DEVICE path
PCI/VGA: Move disabled VGA device detection to ADD_DEVICE path
PCI/VGA: Log bridge control messages when adding devices
drivers/gpu/vga/Kconfig | 19 --
drivers/gpu/vga/Makefile | 1 -
drivers/pci/Kconfig | 19 ++
drivers/pci/Makefile | 1 +
drivers/{gpu/vga => pci}/vgaarb.c | 313 +++++++++++++++---------------
5 files changed, 175 insertions(+), 178 deletions(-)
rename drivers/{gpu/vga => pci}/vgaarb.c (90%)
--
2.25.1
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH v9 01/11] PCI/VGA: Move vgaarb to drivers/pci
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 02/11] PCI/VGA: Move vga_arb_integrated_gpu() earlier in file Bjorn Helgaas
` (10 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bjorn Helgaas
From: Bjorn Helgaas <bhelgaas@google.com>
The VGA arbiter is really PCI-specific and doesn't depend on any GPU
things. Move it to the PCI subsystem.
Note that misc_init() must be called before vga_arb_device_init(). These
are both subsys_initcalls, so this ordering depends on the link order,
which is determined by drivers/Makefile:
obj-y += pci/
obj-y += char/ <-- misc_init()
obj-y += gpu/ <-- vga_arb_device_init() (before this commit)
The drivers/pci/ subsys_initcalls are called *before* misc_init(), so
convert vga_arb_device_init() to subsys_initcall_sync(), which is called
after *all* subsys_initcalls.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/gpu/vga/Kconfig | 19 -------------------
drivers/gpu/vga/Makefile | 1 -
drivers/pci/Kconfig | 19 +++++++++++++++++++
drivers/pci/Makefile | 1 +
drivers/{gpu/vga => pci}/vgaarb.c | 2 +-
5 files changed, 21 insertions(+), 21 deletions(-)
rename drivers/{gpu/vga => pci}/vgaarb.c (99%)
diff --git a/drivers/gpu/vga/Kconfig b/drivers/gpu/vga/Kconfig
index 1ad4c4ef0b5e..eb8b14ab22c3 100644
--- a/drivers/gpu/vga/Kconfig
+++ b/drivers/gpu/vga/Kconfig
@@ -1,23 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
-config VGA_ARB
- bool "VGA Arbitration" if EXPERT
- default y
- depends on (PCI && !S390)
- help
- Some "legacy" VGA devices implemented on PCI typically have the same
- hard-decoded addresses as they did on ISA. When multiple PCI devices
- are accessed at same time they need some kind of coordination. Please
- see Documentation/gpu/vgaarbiter.rst for more details. Select this to
- enable VGA arbiter.
-
-config VGA_ARB_MAX_GPUS
- int "Maximum number of GPUs"
- default 16
- depends on VGA_ARB
- help
- Reserves space in the kernel to maintain resource locking for
- multiple GPUS. The overhead for each GPU is very small.
-
config VGA_SWITCHEROO
bool "Laptop Hybrid Graphics - GPU switching support"
depends on X86
diff --git a/drivers/gpu/vga/Makefile b/drivers/gpu/vga/Makefile
index e92064442d60..9800620deda3 100644
--- a/drivers/gpu/vga/Makefile
+++ b/drivers/gpu/vga/Makefile
@@ -1,3 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_VGA_ARB) += vgaarb.o
obj-$(CONFIG_VGA_SWITCHEROO) += vga_switcheroo.o
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index d98fafdd0f99..133c73207782 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -252,6 +252,25 @@ config PCIE_BUS_PEER2PEER
endchoice
+config VGA_ARB
+ bool "VGA Arbitration" if EXPERT
+ default y
+ depends on (PCI && !S390)
+ help
+ Some "legacy" VGA devices implemented on PCI typically have the same
+ hard-decoded addresses as they did on ISA. When multiple PCI devices
+ are accessed at same time they need some kind of coordination. Please
+ see Documentation/gpu/vgaarbiter.rst for more details. Select this to
+ enable VGA arbiter.
+
+config VGA_ARB_MAX_GPUS
+ int "Maximum number of GPUs"
+ default 16
+ depends on VGA_ARB
+ help
+ Reserves space in the kernel to maintain resource locking for
+ multiple GPUS. The overhead for each GPU is very small.
+
source "drivers/pci/hotplug/Kconfig"
source "drivers/pci/controller/Kconfig"
source "drivers/pci/endpoint/Kconfig"
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 37be95adf169..0da6b1ebc694 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_PCI_PF_STUB) += pci-pf-stub.o
obj-$(CONFIG_PCI_ECAM) += ecam.o
obj-$(CONFIG_PCI_P2PDMA) += p2pdma.o
obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o
+obj-$(CONFIG_VGA_ARB) += vgaarb.o
# Endpoint library must be initialized before its users
obj-$(CONFIG_PCI_ENDPOINT) += endpoint/
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/pci/vgaarb.c
similarity index 99%
rename from drivers/gpu/vga/vgaarb.c
rename to drivers/pci/vgaarb.c
index 569930552957..8320385a487b 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -1564,4 +1564,4 @@ static int __init vga_arb_device_init(void)
pr_info("loaded\n");
return rc;
}
-subsys_initcall(vga_arb_device_init);
+subsys_initcall_sync(vga_arb_device_init);
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 02/11] PCI/VGA: Move vga_arb_integrated_gpu() earlier in file
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 01/11] PCI/VGA: Move vgaarb to drivers/pci Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 03/11] PCI/VGA: Factor out vga_select_framebuffer_device() Bjorn Helgaas
` (9 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel
From: Huacai Chen <chenhuacai@loongson.cn>
Move vga_arb_integrated_gpu() earlier in file to prepare for future patch.
No functional change intended.
[bhelgaas: pull #ifdefs inside function]
Link: https://lore.kernel.org/r/20211015061512.2941859-3-chenhuacai@loongson.cn
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
drivers/pci/vgaarb.c | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 8320385a487b..6c57ffb77770 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -565,6 +565,17 @@ void vga_put(struct pci_dev *pdev, unsigned int rsrc)
}
EXPORT_SYMBOL(vga_put);
+static bool vga_arb_integrated_gpu(struct device *dev)
+{
+#if defined(CONFIG_ACPI)
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+
+ return adev && !strcmp(acpi_device_hid(adev), ACPI_VIDEO_HID);
+#else
+ return false;
+#endif
+}
+
/*
* Rules for using a bridge to control a VGA descendant decoding: if a bridge
* has only one VGA descendant then it can be used to control the VGA routing
@@ -1430,20 +1441,6 @@ static struct miscdevice vga_arb_device = {
MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops
};
-#if defined(CONFIG_ACPI)
-static bool vga_arb_integrated_gpu(struct device *dev)
-{
- struct acpi_device *adev = ACPI_COMPANION(dev);
-
- return adev && !strcmp(acpi_device_hid(adev), ACPI_VIDEO_HID);
-}
-#else
-static bool vga_arb_integrated_gpu(struct device *dev)
-{
- return false;
-}
-#endif
-
static void __init vga_arb_select_default_device(void)
{
struct pci_dev *pdev, *found = NULL;
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 03/11] PCI/VGA: Factor out vga_select_framebuffer_device()
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 01/11] PCI/VGA: Move vgaarb to drivers/pci Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 02/11] PCI/VGA: Move vga_arb_integrated_gpu() earlier in file Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 04/11] PCI/VGA: Factor out default VGA device selection Bjorn Helgaas
` (8 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bjorn Helgaas, Bruno Prémont
From: Bjorn Helgaas <bhelgaas@google.com>
On x86 and ia64, if a VGA device BARs include a framebuffer reported by
platform firmware, we select the device as the default VGA device. Factor
this code to a separate function. No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Bruno Prémont <bonbons@linux-vserver.org>
---
drivers/pci/vgaarb.c | 99 ++++++++++++++++++++++++--------------------
1 file changed, 53 insertions(+), 46 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 6c57ffb77770..3f8fead49197 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -565,6 +565,58 @@ void vga_put(struct pci_dev *pdev, unsigned int rsrc)
}
EXPORT_SYMBOL(vga_put);
+static void __init vga_select_framebuffer_device(struct pci_dev *pdev)
+{
+#if defined(CONFIG_X86) || defined(CONFIG_IA64)
+ struct device *dev = &pdev->dev;
+ u64 base = screen_info.lfb_base;
+ u64 size = screen_info.lfb_size;
+ u64 limit;
+ resource_size_t start, end;
+ unsigned long flags;
+ int i;
+
+ /* Select the device owning the boot framebuffer if there is one */
+
+ if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
+ base |= (u64)screen_info.ext_lfb_base << 32;
+
+ limit = base + size;
+
+ /*
+ * Override vga_arbiter_add_pci_device()'s I/O based detection
+ * as it may take the wrong device (e.g. on Apple system under
+ * EFI).
+ *
+ * Select the device owning the boot framebuffer if there is
+ * one.
+ */
+
+ /* Does firmware framebuffer belong to us? */
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ flags = pci_resource_flags(pdev, i);
+
+ if ((flags & IORESOURCE_MEM) == 0)
+ continue;
+
+ start = pci_resource_start(pdev, i);
+ end = pci_resource_end(pdev, i);
+
+ if (!start || !end)
+ continue;
+
+ if (base < start || limit >= end)
+ continue;
+
+ if (!vga_default_device())
+ vgaarb_info(dev, "setting as boot device\n");
+ else if (pdev != vga_default_device())
+ vgaarb_info(dev, "overriding boot device\n");
+ vga_set_default_device(pdev);
+ }
+#endif
+}
+
static bool vga_arb_integrated_gpu(struct device *dev)
{
#if defined(CONFIG_ACPI)
@@ -1446,54 +1498,9 @@ static void __init vga_arb_select_default_device(void)
struct pci_dev *pdev, *found = NULL;
struct vga_device *vgadev;
-#if defined(CONFIG_X86) || defined(CONFIG_IA64)
- u64 base = screen_info.lfb_base;
- u64 size = screen_info.lfb_size;
- u64 limit;
- resource_size_t start, end;
- unsigned long flags;
- int i;
-
- if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
- base |= (u64)screen_info.ext_lfb_base << 32;
-
- limit = base + size;
-
list_for_each_entry(vgadev, &vga_list, list) {
- struct device *dev = &vgadev->pdev->dev;
- /*
- * Override vga_arbiter_add_pci_device()'s I/O based detection
- * as it may take the wrong device (e.g. on Apple system under
- * EFI).
- *
- * Select the device owning the boot framebuffer if there is
- * one.
- */
-
- /* Does firmware framebuffer belong to us? */
- for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
- flags = pci_resource_flags(vgadev->pdev, i);
-
- if ((flags & IORESOURCE_MEM) == 0)
- continue;
-
- start = pci_resource_start(vgadev->pdev, i);
- end = pci_resource_end(vgadev->pdev, i);
-
- if (!start || !end)
- continue;
-
- if (base < start || limit >= end)
- continue;
-
- if (!vga_default_device())
- vgaarb_info(dev, "setting as boot device\n");
- else if (vgadev->pdev != vga_default_device())
- vgaarb_info(dev, "overriding boot device\n");
- vga_set_default_device(vgadev->pdev);
- }
+ vga_select_framebuffer_device(vgadev->pdev);
}
-#endif
if (!vga_default_device()) {
list_for_each_entry_reverse(vgadev, &vga_list, list) {
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 04/11] PCI/VGA: Factor out default VGA device selection
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (2 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 03/11] PCI/VGA: Factor out vga_select_framebuffer_device() Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 05/11] PCI/VGA: Move firmware default device detection to ADD_DEVICE path Bjorn Helgaas
` (7 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel
From: Huacai Chen <chenhuacai@loongson.cn>
Default VGA device selection fails when PCI devices are enumerated after
the vga_arb_device_init() subsys_initcall.
vga_arbiter_add_pci_device() selects the first fully enabled device to
which legacy VGA resources are routed as the default VGA device. This is
an ADD_DEVICE notifier, so it runs after every PCI device is enumerated.
vga_arb_select_default_device() may select framebuffer devices, partially
enabled GPUs, or non-legacy devices that don't have legacy VGA resources
routed to them as the default VGA device. But this only happens once, from
the vga_arb_device_init() subsys_initcall, so it doesn't consider devices
enumerated after that:
acpi_init
acpi_scan_init
acpi_pci_root_init # PCI device enumeration (ACPI systems)
vga_arb_device_init
for_each_pci_device
vga_arbiter_add_pci_device # ADD_DEVICE notifier
if (VGA-owner)
vga_set_default_device <-- set default VGA
vga_arb_select_default_device # only called ONCE
for_each_vga_device
if (framebuffer)
vga_set_default_device <-- set default VGA to framebuffer
if (!vga_default_device())
if (non-legacy, integrated GPU, etc)
vga_set_default_device <-- set default VGA
if (!vga_default_device())
vga_set_default_device <-- set default VGA
pcibios_init
pcibios_scanbus # PCI device enumeration (non-ACPI systems)
...
vga_arbiter_add_pci_device # ADD_DEVICE notification
if (VGA-owner)
vga_set_default_device <-- set default VGA
Note that on non-ACPI systems, vga_arb_select_default_device() runs before
pcibios_init(), so it sees no VGA devices and can never set a framebuffer
device, a non-legacy integrated GPU, etc., as the default device.
Factor out the default VGA device selection to vga_is_boot_device(), called
from vga_arbiter_add_pci_device().
Then we can migrate the default device selection from
vga_arb_select_default_device() to the vga_arbiter_add_pci_device() path.
[bhelgaas: commit log, split to separate patch]
Link: https://lore.kernel.org/r/20211015061512.2941859-4-chenhuacai@loongson.cn
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
drivers/pci/vgaarb.c | 45 ++++++++++++++++++++++++++++++++++++++------
1 file changed, 39 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 3f8fead49197..58e0a12e623b 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -628,6 +628,41 @@ static bool vga_arb_integrated_gpu(struct device *dev)
#endif
}
+/*
+ * Return true if vgadev is a better default VGA device than the best one
+ * we've seen so far.
+ */
+static bool vga_is_boot_device(struct vga_device *vgadev)
+{
+ struct vga_device *boot_vga = vgadev_find(vga_default_device());
+
+ /*
+ * We select the default VGA device in this order:
+ * Firmware framebuffer (see vga_arb_select_default_device())
+ * Legacy VGA device (owns VGA_RSRC_LEGACY_MASK)
+ * Non-legacy integrated device (see vga_arb_select_default_device())
+ * Non-legacy discrete device (see vga_arb_select_default_device())
+ * Other device (see vga_arb_select_default_device())
+ */
+
+ /*
+ * A legacy VGA device has MEM and IO enabled and any bridges
+ * leading to it have PCI_BRIDGE_CTL_VGA enabled so the legacy
+ * resources ([mem 0xa0000-0xbffff], [io 0x3b0-0x3bb], etc) are
+ * routed to it.
+ *
+ * We use the first one we find, so if we've already found one,
+ * vgadev is no better.
+ */
+ if (boot_vga)
+ return false;
+
+ if ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)
+ return true;
+
+ return false;
+}
+
/*
* Rules for using a bridge to control a VGA descendant decoding: if a bridge
* has only one VGA descendant then it can be used to control the VGA routing
@@ -755,12 +790,10 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
bus = bus->parent;
}
- /* Deal with VGA default device. Use first enabled one
- * by default if arch doesn't have it's own hook
- */
- if (vga_default == NULL &&
- ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) {
- vgaarb_info(&pdev->dev, "setting as boot VGA device\n");
+ if (vga_is_boot_device(vgadev)) {
+ vgaarb_info(&pdev->dev, "setting as boot VGA device%s\n",
+ vga_default_device() ?
+ " (overriding previous)" : "");
vga_set_default_device(pdev);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 05/11] PCI/VGA: Move firmware default device detection to ADD_DEVICE path
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (3 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 04/11] PCI/VGA: Factor out default VGA device selection Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 06/11] PCI/VGA: Move non-legacy VGA " Bjorn Helgaas
` (6 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bruno Prémont
From: Huacai Chen <chenhuacai@loongson.cn>
Previously we selected the firmware default device, i.e., one that owns the
boot framebuffer, as the default device in vga_arb_select_default_device().
This was only done in the vga_arb_device_init() subsys_initcall, so devices
enumerated later, e.g., by pcibios_init(), were not eligible.
Fix this by moving the firmware default device selection from
vga_arb_select_default_device() to vga_arbiter_add_pci_device(), which is
called after every PCI device is enumerated, either by the
vga_arb_device_init() subsys_initcall or as an ADD_DEVICE notifier.
Note that if vga_arb_select_default_device() previously found a device
owning the boot framebuffer, it unconditionally set it to be the default
VGA device, and no subsequent device could replace it.
[bhelgaas: commit log, restructure slightly]
Link: https://lore.kernel.org/r/20211015061512.2941859-7-chenhuacai@loongson.cn
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Cc: Bruno Prémont <bonbons@linux-vserver.org>
---
drivers/pci/vgaarb.c | 37 +++++++++++++++++--------------------
1 file changed, 17 insertions(+), 20 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 58e0a12e623b..c3323ab4f98e 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -72,6 +72,7 @@ struct vga_device {
unsigned int io_norm_cnt; /* normal IO count */
unsigned int mem_norm_cnt; /* normal MEM count */
bool bridge_has_one_vga;
+ bool is_firmware_default; /* device selected by firmware */
unsigned int (*set_decode)(struct pci_dev *pdev, bool decode);
};
@@ -565,10 +566,9 @@ void vga_put(struct pci_dev *pdev, unsigned int rsrc)
}
EXPORT_SYMBOL(vga_put);
-static void __init vga_select_framebuffer_device(struct pci_dev *pdev)
+static bool vga_is_firmware_default(struct pci_dev *pdev)
{
#if defined(CONFIG_X86) || defined(CONFIG_IA64)
- struct device *dev = &pdev->dev;
u64 base = screen_info.lfb_base;
u64 size = screen_info.lfb_size;
u64 limit;
@@ -583,15 +583,6 @@ static void __init vga_select_framebuffer_device(struct pci_dev *pdev)
limit = base + size;
- /*
- * Override vga_arbiter_add_pci_device()'s I/O based detection
- * as it may take the wrong device (e.g. on Apple system under
- * EFI).
- *
- * Select the device owning the boot framebuffer if there is
- * one.
- */
-
/* Does firmware framebuffer belong to us? */
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
flags = pci_resource_flags(pdev, i);
@@ -608,13 +599,10 @@ static void __init vga_select_framebuffer_device(struct pci_dev *pdev)
if (base < start || limit >= end)
continue;
- if (!vga_default_device())
- vgaarb_info(dev, "setting as boot device\n");
- else if (pdev != vga_default_device())
- vgaarb_info(dev, "overriding boot device\n");
- vga_set_default_device(pdev);
+ return true;
}
#endif
+ return false;
}
static bool vga_arb_integrated_gpu(struct device *dev)
@@ -635,6 +623,7 @@ static bool vga_arb_integrated_gpu(struct device *dev)
static bool vga_is_boot_device(struct vga_device *vgadev)
{
struct vga_device *boot_vga = vgadev_find(vga_default_device());
+ struct pci_dev *pdev = vgadev->pdev;
/*
* We select the default VGA device in this order:
@@ -645,6 +634,18 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
* Other device (see vga_arb_select_default_device())
*/
+ /*
+ * We always prefer a firmware default device, so if we've already
+ * found one, there's no need to consider vgadev.
+ */
+ if (boot_vga && boot_vga->is_firmware_default)
+ return false;
+
+ if (vga_is_firmware_default(pdev)) {
+ vgadev->is_firmware_default = true;
+ return true;
+ }
+
/*
* A legacy VGA device has MEM and IO enabled and any bridges
* leading to it have PCI_BRIDGE_CTL_VGA enabled so the legacy
@@ -1531,10 +1532,6 @@ static void __init vga_arb_select_default_device(void)
struct pci_dev *pdev, *found = NULL;
struct vga_device *vgadev;
- list_for_each_entry(vgadev, &vga_list, list) {
- vga_select_framebuffer_device(vgadev->pdev);
- }
-
if (!vga_default_device()) {
list_for_each_entry_reverse(vgadev, &vga_list, list) {
struct device *dev = &vgadev->pdev->dev;
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 06/11] PCI/VGA: Move non-legacy VGA detection to ADD_DEVICE path
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (4 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 05/11] PCI/VGA: Move firmware default device detection to ADD_DEVICE path Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 07/11] PCI/VGA: Move disabled VGA device " Bjorn Helgaas
` (5 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Daniel Axtens, Zhou Wang
From: Huacai Chen <chenhuacai@loongson.cn>
a37c0f48950b ("vgaarb: Select a default VGA device even if there's no
legacy VGA") extended the vga_arb_device_init() subsys_initcall so it could
select a non-legacy VGA device as the default.
That failed to consider that PCI devices may be enumerated after
vga_arb_device_init(), e.g., hot-added devices or non-ACPI systems that do
PCI enumeration in pcibios_init(). Devices found then could never be
selected as the default.
One system where this is a problem is the MIPS-based Loongson where an
ASpeed AST2500 VGA device is behind a bridge that doesn't implement the VGA
Enable bit, so legacy resources are not routed to the VGA device. [1]
Fix this by moving the non-legacy VGA device selection from
vga_arb_select_default_device() to vga_arbiter_add_pci_device(), which is
called after every PCI device is enumerated, either by the
vga_arb_device_init() subsys_initcall or as an ADD_DEVICE notifier.
[1] https://lore.kernel.org/r/20210514080025.1828197-6-chenhuacai@loongson.cn
[bhelgaas: commit log, restructure]
Link: https://lore.kernel.org/r/20211015061512.2941859-5-chenhuacai@loongson.cn
Link: https://lore.kernel.org/r/20211015061512.2941859-7-chenhuacai@loongson.cn
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
---
drivers/pci/vgaarb.c | 54 ++++++++++++++++++++++++++------------------
1 file changed, 32 insertions(+), 22 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index c3323ab4f98e..e36ccbfdbd89 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -624,6 +624,7 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
{
struct vga_device *boot_vga = vgadev_find(vga_default_device());
struct pci_dev *pdev = vgadev->pdev;
+ u16 cmd, boot_cmd;
/*
* We select the default VGA device in this order:
@@ -661,6 +662,37 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
if ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)
return true;
+ /*
+ * If we haven't found a legacy VGA device, accept a non-legacy
+ * device. It may have either IO or MEM enabled, and bridges may
+ * not have PCI_BRIDGE_CTL_VGA enabled, so it may not be able to
+ * use legacy VGA resources. Prefer an integrated GPU over others.
+ */
+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
+
+ /*
+ * An integrated GPU overrides a previous non-legacy
+ * device. We expect only a single integrated GPU, but if
+ * there are more, we use the *last* because that was the
+ * previous behavior.
+ */
+ if (vga_arb_integrated_gpu(&pdev->dev))
+ return true;
+
+ /*
+ * We prefer the first non-legacy discrete device we find.
+ * If we already found one, vgadev is no better.
+ */
+ if (boot_vga) {
+ pci_read_config_word(boot_vga->pdev, PCI_COMMAND,
+ &boot_cmd);
+ if (boot_cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
+ return false;
+ }
+ return true;
+ }
+
return false;
}
@@ -1529,30 +1561,8 @@ static struct miscdevice vga_arb_device = {
static void __init vga_arb_select_default_device(void)
{
- struct pci_dev *pdev, *found = NULL;
struct vga_device *vgadev;
- if (!vga_default_device()) {
- list_for_each_entry_reverse(vgadev, &vga_list, list) {
- struct device *dev = &vgadev->pdev->dev;
- u16 cmd;
-
- pdev = vgadev->pdev;
- pci_read_config_word(pdev, PCI_COMMAND, &cmd);
- if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
- found = pdev;
- if (vga_arb_integrated_gpu(dev))
- break;
- }
- }
- }
-
- if (found) {
- vgaarb_info(&found->dev, "setting as boot device (VGA legacy resources not available)\n");
- vga_set_default_device(found);
- return;
- }
-
if (!vga_default_device()) {
vgadev = list_first_entry_or_null(&vga_list,
struct vga_device, list);
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 07/11] PCI/VGA: Move disabled VGA device detection to ADD_DEVICE path
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (5 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 06/11] PCI/VGA: Move non-legacy VGA " Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 08/11] PCI/VGA: Remove empty vga_arb_device_card_gone() Bjorn Helgaas
` (4 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Huacai Chen, Daniel Axtens, Zhou Wang
From: Huacai Chen <chenhuacai@loongson.cn>
a37c0f48950b ("vgaarb: Select a default VGA device even if there's no
legacy VGA") extended the vga_arb_device_init() subsys_initcall so that if
there are no other eligible devices, it could select a disabled VGA device
as the default.
Move this detection from vga_arb_select_default_device() to
vga_arbiter_add_pci_device() so every device, even those hot-added or
enumerated after vga_arb_device_init() is eligible for selection as the
default VGA device.
[bhelgaas: commit log, restructure]
Link: https://lore.kernel.org/r/20211015061512.2941859-5-chenhuacai@loongson.cn
Signed-off-by: Huacai Chen <chenhuacai@kernel.org>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
---
drivers/pci/vgaarb.c | 27 +++++++++------------------
1 file changed, 9 insertions(+), 18 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index e36ccbfdbd89..e8d5efd85ba6 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -656,7 +656,8 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
* We use the first one we find, so if we've already found one,
* vgadev is no better.
*/
- if (boot_vga)
+ if (boot_vga &&
+ (boot_vga->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)
return false;
if ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)
@@ -693,6 +694,13 @@ static bool vga_is_boot_device(struct vga_device *vgadev)
return true;
}
+ /*
+ * vgadev has neither IO nor MEM enabled. If we haven't found any
+ * other VGA devices, it is the best candidate so far.
+ */
+ if (!boot_vga)
+ return true;
+
return false;
}
@@ -1559,21 +1567,6 @@ static struct miscdevice vga_arb_device = {
MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops
};
-static void __init vga_arb_select_default_device(void)
-{
- struct vga_device *vgadev;
-
- if (!vga_default_device()) {
- vgadev = list_first_entry_or_null(&vga_list,
- struct vga_device, list);
- if (vgadev) {
- struct device *dev = &vgadev->pdev->dev;
- vgaarb_info(dev, "setting as boot device (VGA legacy resources not available)\n");
- vga_set_default_device(vgadev->pdev);
- }
- }
-}
-
static int __init vga_arb_device_init(void)
{
int rc;
@@ -1603,8 +1596,6 @@ static int __init vga_arb_device_init(void)
vgaarb_info(dev, "no bridge control possible\n");
}
- vga_arb_select_default_device();
-
pr_info("loaded\n");
return rc;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 08/11] PCI/VGA: Remove empty vga_arb_device_card_gone()
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (6 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 07/11] PCI/VGA: Move disabled VGA device " Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 09/11] PCI/VGA: Log bridge control messages when adding devices Bjorn Helgaas
` (3 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bjorn Helgaas
From: Bjorn Helgaas <bhelgaas@google.com>
vga_arb_device_card_gone() has always been empty. Remove it.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/vgaarb.c | 16 +---------------
1 file changed, 1 insertion(+), 15 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index e8d5efd85ba6..582f0054b71a 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -123,8 +123,6 @@ static int vga_str_to_iostate(char *buf, int str_size, int *io_state)
/* this is only used a cookie - it should not be dereferenced */
static struct pci_dev *vga_default;
-static void vga_arb_device_card_gone(struct pci_dev *pdev);
-
/* Find somebody in our list */
static struct vga_device *vgadev_find(struct pci_dev *pdev)
{
@@ -878,10 +876,6 @@ static bool vga_arbiter_del_pci_device(struct pci_dev *pdev)
/* Remove entry from list */
list_del(&vgadev->list);
vga_count--;
- /* Notify userland driver that the device is gone so it discards
- * it's copies of the pci_dev pointer
- */
- vga_arb_device_card_gone(pdev);
/* Wake up all possible waiters */
wake_up_all(&vga_wait_queue);
@@ -1131,9 +1125,7 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf,
if (lbuf == NULL)
return -ENOMEM;
- /* Shields against vga_arb_device_card_gone (pci_dev going
- * away), and allows access to vga list
- */
+ /* Protects vga_list */
spin_lock_irqsave(&vga_lock, flags);
/* If we are targeting the default, use it */
@@ -1150,8 +1142,6 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf,
/* Wow, it's not in the list, that shouldn't happen,
* let's fix us up and return invalid card
*/
- if (pdev == priv->target)
- vga_arb_device_card_gone(pdev);
spin_unlock_irqrestore(&vga_lock, flags);
len = sprintf(lbuf, "invalid");
goto done;
@@ -1495,10 +1485,6 @@ static int vga_arb_release(struct inode *inode, struct file *file)
return 0;
}
-static void vga_arb_device_card_gone(struct pci_dev *pdev)
-{
-}
-
/*
* callback any registered clients to let them know we have a
* change in VGA cards
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 09/11] PCI/VGA: Log bridge control messages when adding devices
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (7 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 08/11] PCI/VGA: Remove empty vga_arb_device_card_gone() Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 10/11] PCI/VGA: Use unsigned format string to print lock counts Bjorn Helgaas
` (2 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel
From: Huacai Chen <chenhuacai@loongson.cn>
Previously vga_arb_device_init() iterated through all VGA devices and
indicated whether legacy VGA routing to each could be controlled by an
upstream bridge.
But we determine that information in vga_arbiter_add_pci_device(), which we
call for every device, so we can log it there without iterating through the
VGA devices again.
Note that we call vga_arbiter_check_bridge_sharing() before adding the
device to vga_list, so we have to handle the very first device separately.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
drivers/pci/vgaarb.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 582f0054b71a..7b1bfdea9d10 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -719,8 +719,10 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
vgadev->bridge_has_one_vga = true;
- if (list_empty(&vga_list))
+ if (list_empty(&vga_list)) {
+ vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n");
return;
+ }
/* okay iterate the new devices bridge hierarachy */
new_bus = vgadev->pdev->bus;
@@ -759,6 +761,11 @@ static void vga_arbiter_check_bridge_sharing(struct vga_device *vgadev)
}
new_bus = new_bus->parent;
}
+
+ if (vgadev->bridge_has_one_vga)
+ vgaarb_info(&vgadev->pdev->dev, "bridge control possible\n");
+ else
+ vgaarb_info(&vgadev->pdev->dev, "no bridge control possible\n");
}
/*
@@ -1557,7 +1564,6 @@ static int __init vga_arb_device_init(void)
{
int rc;
struct pci_dev *pdev;
- struct vga_device *vgadev;
rc = misc_register(&vga_arb_device);
if (rc < 0)
@@ -1573,15 +1579,6 @@ static int __init vga_arb_device_init(void)
PCI_ANY_ID, pdev)) != NULL)
vga_arbiter_add_pci_device(pdev);
- list_for_each_entry(vgadev, &vga_list, list) {
- struct device *dev = &vgadev->pdev->dev;
-
- if (vgadev->bridge_has_one_vga)
- vgaarb_info(dev, "bridge control possible\n");
- else
- vgaarb_info(dev, "no bridge control possible\n");
- }
-
pr_info("loaded\n");
return rc;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 10/11] PCI/VGA: Use unsigned format string to print lock counts
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (8 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 09/11] PCI/VGA: Log bridge control messages when adding devices Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 11/11] PCI/VGA: Replace full MIT license text with SPDX identifier Bjorn Helgaas
2022-02-25 22:15 ` [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bjorn Helgaas
From: Bjorn Helgaas <bhelgaas@google.com>
In struct vga_device, io_lock_cnt and mem_lock_cnt are unsigned, but we
previously printed them with "%d", the signed decimal format. Print them
with the unsigned format "%u" instead.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/vgaarb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index 7b1bfdea9d10..d6e77c6a9a1a 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -1156,7 +1156,7 @@ static ssize_t vga_arb_read(struct file *file, char __user *buf,
/* Fill the buffer with infos */
len = snprintf(lbuf, 1024,
- "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%d:%d)\n",
+ "count:%d,PCI:%s,decodes=%s,owns=%s,locks=%s(%u:%u)\n",
vga_decode_count, pci_name(pdev),
vga_iostate_to_str(vgadev->decodes),
vga_iostate_to_str(vgadev->owns),
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v9 11/11] PCI/VGA: Replace full MIT license text with SPDX identifier
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (9 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 10/11] PCI/VGA: Use unsigned format string to print lock counts Bjorn Helgaas
@ 2022-02-24 22:47 ` Bjorn Helgaas
2022-02-25 22:15 ` [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
11 siblings, 0 replies; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-24 22:47 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, Daniel Vetter, Xuefeng Li, Huacai Chen, linux-pci,
linux-kernel, dri-devel, Bjorn Helgaas
From: Bjorn Helgaas <bhelgaas@google.com>
Per Documentation/process/license-rules.rst, the SPDX MIT identifier is
equivalent to including the entire MIT license text from
LICENSES/preferred/MIT.
Replace the MIT license text with the equivalent SPDX identifier.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/vgaarb.c | 23 +----------------------
1 file changed, 1 insertion(+), 22 deletions(-)
diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
index d6e77c6a9a1a..f80b6ec88dc3 100644
--- a/drivers/pci/vgaarb.c
+++ b/drivers/pci/vgaarb.c
@@ -1,32 +1,11 @@
+// SPDX-License-Identifier: MIT
/*
* vgaarb.c: Implements the VGA arbitration. For details refer to
* Documentation/gpu/vgaarbiter.rst
*
- *
* (C) Copyright 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
* (C) Copyright 2007 Paulo R. Zanoni <przanoni@gmail.com>
* (C) Copyright 2007, 2009 Tiago Vignatti <vignatti@freedesktop.org>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS
- * IN THE SOFTWARE.
- *
*/
#define pr_fmt(fmt) "vgaarb: " fmt
--
2.25.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [PATCH v9 00/11] vgaarb: Rework default VGA device selection
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
` (10 preceding siblings ...)
2022-02-24 22:47 ` [PATCH v9 11/11] PCI/VGA: Replace full MIT license text with SPDX identifier Bjorn Helgaas
@ 2022-02-25 22:15 ` Bjorn Helgaas
2022-03-09 16:29 ` Bjorn Helgaas
11 siblings, 1 reply; 15+ messages in thread
From: Bjorn Helgaas @ 2022-02-25 22:15 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, linux-pci, linux-kernel, dri-devel, Bjorn Helgaas,
Xuefeng Li, Huacai Chen
On Thu, Feb 24, 2022 at 04:47:42PM -0600, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Current default VGA device selection fails in some cases because part of it
> is done in the vga_arb_device_init() subsys_initcall, and some arches
> enumerate PCI devices in pcibios_init(), which runs *after* that.
>
> The big change from the v8 posting is that this moves vgaarb.c from
> drivers/gpu/vga to drivers/pci because it really has nothing to do with
> GPUs or DRM.
I provisionally applied this to pci/vga and put it into -next just
to get a little runtime on it.
But I'd prefer not to unilaterally yank this out of drivers/gpu
without a consensus from the GPU folks that this is the right thing to
do.
Any thoughts? If it seems OK to you, I think patch 1/11 (the move
itself) is all you would need to look at, although of course I would
still be grateful for any review and feedback on the rest.
After it's in drivers/pci, all the blame for any issues would come my
way.
Bjorn
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH v9 00/11] vgaarb: Rework default VGA device selection
2022-02-25 22:15 ` [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
@ 2022-03-09 16:29 ` Bjorn Helgaas
2022-03-10 3:56 ` Huacai Chen
0 siblings, 1 reply; 15+ messages in thread
From: Bjorn Helgaas @ 2022-03-09 16:29 UTC (permalink / raw)
To: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann
Cc: David Airlie, linux-pci, linux-kernel, dri-devel, Bjorn Helgaas,
Xuefeng Li, Huacai Chen
On Fri, Feb 25, 2022 at 04:15:23PM -0600, Bjorn Helgaas wrote:
> On Thu, Feb 24, 2022 at 04:47:42PM -0600, Bjorn Helgaas wrote:
> > From: Bjorn Helgaas <bhelgaas@google.com>
> >
> > Current default VGA device selection fails in some cases because part of it
> > is done in the vga_arb_device_init() subsys_initcall, and some arches
> > enumerate PCI devices in pcibios_init(), which runs *after* that.
> >
> > The big change from the v8 posting is that this moves vgaarb.c from
> > drivers/gpu/vga to drivers/pci because it really has nothing to do with
> > GPUs or DRM.
>
> I provisionally applied this to pci/vga and put it into -next just
> to get a little runtime on it.
>
> But I'd prefer not to unilaterally yank this out of drivers/gpu
> without a consensus from the GPU folks that this is the right thing to
> do.
>
> Any thoughts? If it seems OK to you, I think patch 1/11 (the move
> itself) is all you would need to look at, although of course I would
> still be grateful for any review and feedback on the rest.
>
> After it's in drivers/pci, all the blame for any issues would come my
> way.
Ping? This has been in -next since the Feb 28 tree, and I plan to
ask Linus to include it during the v5.18 merge window (which will
probably open Mar 13) unless somebody objects.
Bjorn
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH v9 00/11] vgaarb: Rework default VGA device selection
2022-03-09 16:29 ` Bjorn Helgaas
@ 2022-03-10 3:56 ` Huacai Chen
0 siblings, 0 replies; 15+ messages in thread
From: Huacai Chen @ 2022-03-10 3:56 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann,
David Airlie, linux-pci, LKML, Maling list - DRI developers,
Bjorn Helgaas, Xuefeng Li, Huacai Chen
I have no objection :)
Huacai
On Thu, Mar 10, 2022 at 12:29 AM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> On Fri, Feb 25, 2022 at 04:15:23PM -0600, Bjorn Helgaas wrote:
> > On Thu, Feb 24, 2022 at 04:47:42PM -0600, Bjorn Helgaas wrote:
> > > From: Bjorn Helgaas <bhelgaas@google.com>
> > >
> > > Current default VGA device selection fails in some cases because part of it
> > > is done in the vga_arb_device_init() subsys_initcall, and some arches
> > > enumerate PCI devices in pcibios_init(), which runs *after* that.
> > >
> > > The big change from the v8 posting is that this moves vgaarb.c from
> > > drivers/gpu/vga to drivers/pci because it really has nothing to do with
> > > GPUs or DRM.
> >
> > I provisionally applied this to pci/vga and put it into -next just
> > to get a little runtime on it.
> >
> > But I'd prefer not to unilaterally yank this out of drivers/gpu
> > without a consensus from the GPU folks that this is the right thing to
> > do.
> >
> > Any thoughts? If it seems OK to you, I think patch 1/11 (the move
> > itself) is all you would need to look at, although of course I would
> > still be grateful for any review and feedback on the rest.
> >
> > After it's in drivers/pci, all the blame for any issues would come my
> > way.
>
> Ping? This has been in -next since the Feb 28 tree, and I plan to
> ask Linus to include it during the v5.18 merge window (which will
> probably open Mar 13) unless somebody objects.
>
> Bjorn
^ permalink raw reply [flat|nested] 15+ messages in thread
end of thread, other threads:[~2022-03-10 3:57 UTC | newest]
Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-24 22:47 [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 01/11] PCI/VGA: Move vgaarb to drivers/pci Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 02/11] PCI/VGA: Move vga_arb_integrated_gpu() earlier in file Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 03/11] PCI/VGA: Factor out vga_select_framebuffer_device() Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 04/11] PCI/VGA: Factor out default VGA device selection Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 05/11] PCI/VGA: Move firmware default device detection to ADD_DEVICE path Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 06/11] PCI/VGA: Move non-legacy VGA " Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 07/11] PCI/VGA: Move disabled VGA device " Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 08/11] PCI/VGA: Remove empty vga_arb_device_card_gone() Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 09/11] PCI/VGA: Log bridge control messages when adding devices Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 10/11] PCI/VGA: Use unsigned format string to print lock counts Bjorn Helgaas
2022-02-24 22:47 ` [PATCH v9 11/11] PCI/VGA: Replace full MIT license text with SPDX identifier Bjorn Helgaas
2022-02-25 22:15 ` [PATCH v9 00/11] vgaarb: Rework default VGA device selection Bjorn Helgaas
2022-03-09 16:29 ` Bjorn Helgaas
2022-03-10 3:56 ` Huacai Chen
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).