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authorMatthew Garrett <mjg@redhat.com>2012-04-16 16:26:02 -0400
committerDave Airlie <airlied@redhat.com>2012-04-24 09:50:15 +0100
commit1a39b310e920bb7098067d96411b31e459ae8f32 (patch)
tree90f45eed83bcd5308ac9ad850844d0b57038e5f8 /drivers/pci
parentf122c6109b1a79153cfb1e188c665ce3f312a886 (diff)
downloadop-kernel-dev-1a39b310e920bb7098067d96411b31e459ae8f32.zip
op-kernel-dev-1a39b310e920bb7098067d96411b31e459ae8f32.tar.gz
vgaarb: Add support for setting the default video device (v2)
The default VGA device is a somewhat fluid concept on platforms with multiple GPUs. Add support for setting it so switching code can update things appropriately, and make sure that the sysfs code returns the right device if it's changed. v2: Updated to fix builds when __ARCH_HAS_VGA_DEFAULT_DEVICE is false. Signed-off-by: Matthew Garrett <mjg@redhat.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Acked-by: benh@kernel.crashing.org Cc: airlied@redhat.com Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci-sysfs.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index a55e248..86c63fe 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -27,6 +27,7 @@
#include <linux/security.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
+#include <linux/vgaarb.h>
#include "pci.h"
static int sysfs_initialized; /* = 0 */
@@ -417,6 +418,10 @@ static ssize_t
boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_dev *vga_dev = vga_default_device();
+
+ if (vga_dev)
+ return sprintf(buf, "%u\n", (pdev == vga_dev));
return sprintf(buf, "%u\n",
!!(pdev->resource[PCI_ROM_RESOURCE].flags &
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