| Message ID | 20140602201926.4d476818@neptune.home (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jun 02, 2014 at 08:19:26PM +0200, Bruno Prémont wrote: > With commit b4aa0163056b ("efifb: Implement vga_default_device() (v2)") > Matthew Garrett introduced a efifb vga_default_device() so that EFI > systems that do not load shadow VBIOS or setup VGA get proper value for > boot_vga PCI sysfs attribute on the corresponding PCI device. > > Xorg is refusing to detect devices when boot_vga=0 which is the case on > some EFI system (e.g. MacBookAir2,1). Xorg detects the GPU and finds > the dri device but then bails out with "no devices detected". > > Note: When vga_default_device() is set boot_vga PCI sysfs attribute > reflects its state. When unset this attribute is 1 whenever > IORESOURCE_ROM_SHADOW flag is set. > > With introduction of sysfb/simplefb/simpledrm efifb is getting obsolete > while having native drivers for the GPU also makes selecting > sysfb/efifb optional. > > Remove the efifb implementation of vga_default_device() and initialize > vgaarb's vga_default_device() with the PCI GPU that matches boot > screen_info in pci_fixup_video(). > > Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> > --- > arch/ia64/pci/fixup.c | 21 +++++++++++++++++++++ > arch/x86/include/asm/vga.h | 6 ------ > arch/x86/pci/fixup.c | 21 +++++++++++++++++++++ > drivers/video/fbdev/efifb.c | 38 -------------------------------------- > 4 files changed, 42 insertions(+), 44 deletions(-) Something went wrong here. It seems like the [2/2] patch should have been [1/2], and this one should be [2/2]. And this one modifies both arch/ia64/pci/fixup.c and arch/x86/pci/fixup.c, but the other patch mostly combines them, so I don't see how this one applies. And there were unrelated (trivial) changes to these files, so they need to be rebased to v3.16-rc1. I'd take care of the rebase, but I don't understand the other stuff I mentioned. Bjorn > diff --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c > index eee069a..9ed5bef 100644 > --- a/arch/ia64/pci/fixup.c > +++ b/arch/ia64/pci/fixup.c > @@ -37,6 +37,27 @@ static void pci_fixup_video(struct pci_dev *pdev) > return; > /* Maybe, this machine supports legacy memory map. */ > > + if (!vga_default_device()) { > + resource_size_t start, end; > + int i; > + > + /* Does firmware framebuffer belong to us? */ > + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) > + continue; > + > + start = pci_resource_start(pdev, i); > + end = pci_resource_end(pdev, i); > + > + if (!start || !end) > + continue; > + > + if (screen_info.lfb_base >= start && > + (screen_info.lfb_base + screen_info.lfb_size) < end) > + vga_set_default_device(pdev); > + } > + } > + > /* Is VGA routed to us? */ > bus = pdev->bus; > while (bus) { > diff --git a/arch/x86/include/asm/vga.h b/arch/x86/include/asm/vga.h > index 44282fb..c4b9dc2 100644 > --- a/arch/x86/include/asm/vga.h > +++ b/arch/x86/include/asm/vga.h > @@ -17,10 +17,4 @@ > #define vga_readb(x) (*(x)) > #define vga_writeb(x, y) (*(y) = (x)) > > -#ifdef CONFIG_FB_EFI > -#define __ARCH_HAS_VGA_DEFAULT_DEVICE > -extern struct pci_dev *vga_default_device(void); > -extern void vga_set_default_device(struct pci_dev *pdev); > -#endif > - > #endif /* _ASM_X86_VGA_H */ > diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c > index 94ae9ae..7246cf2 100644 > --- a/arch/x86/pci/fixup.c > +++ b/arch/x86/pci/fixup.c > @@ -325,6 +325,27 @@ static void pci_fixup_video(struct pci_dev *pdev) > struct pci_bus *bus; > u16 config; > > + if (!vga_default_device()) { > + resource_size_t start, end; > + int i; > + > + /* Does firmware framebuffer belong to us? */ > + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) > + continue; > + > + start = pci_resource_start(pdev, i); > + end = pci_resource_end(pdev, i); > + > + if (!start || !end) > + continue; > + > + if (screen_info.lfb_base >= start && > + (screen_info.lfb_base + screen_info.lfb_size) < end) > + vga_set_default_device(pdev); > + } > + } > + > /* Is VGA routed to us? */ > bus = pdev->bus; > while (bus) { > diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c > index ae9618f..a033180 100644 > --- a/drivers/video/fbdev/efifb.c > +++ b/drivers/video/fbdev/efifb.c > @@ -19,8 +19,6 @@ > > static bool request_mem_succeeded = false; > > -static struct pci_dev *default_vga; > - > static struct fb_var_screeninfo efifb_defined = { > .activate = FB_ACTIVATE_NOW, > .height = -1, > @@ -84,18 +82,6 @@ static struct fb_ops efifb_ops = { > .fb_imageblit = cfb_imageblit, > }; > > -struct pci_dev *vga_default_device(void) > -{ > - return default_vga; > -} > - > -EXPORT_SYMBOL_GPL(vga_default_device); > - > -void vga_set_default_device(struct pci_dev *pdev) > -{ > - default_vga = pdev; > -} > - > static int efifb_setup(char *options) > { > char *this_opt; > @@ -126,30 +112,6 @@ static int efifb_setup(char *options) > } > } > > - for_each_pci_dev(dev) { > - int i; > - > - if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) > - continue; > - > - for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > - resource_size_t start, end; > - > - if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM)) > - continue; > - > - start = pci_resource_start(dev, i); > - end = pci_resource_end(dev, i); > - > - if (!start || !end) > - continue; > - > - if (screen_info.lfb_base >= start && > - (screen_info.lfb_base + screen_info.lfb_size) < end) > - default_vga = dev; > - } > - } > - > return 0; > } > > -- > 1.8.5.5 >
On Tue, 17 Jun 2014 16:35:42 -0600 Bjorn Helgaas wrote: > On Mon, Jun 02, 2014 at 08:19:26PM +0200, Bruno Prémont wrote: > > With commit b4aa0163056b ("efifb: Implement vga_default_device() (v2)") > > Matthew Garrett introduced a efifb vga_default_device() so that EFI > > systems that do not load shadow VBIOS or setup VGA get proper value for > > boot_vga PCI sysfs attribute on the corresponding PCI device. > > > > Xorg is refusing to detect devices when boot_vga=0 which is the case on > > some EFI system (e.g. MacBookAir2,1). Xorg detects the GPU and finds > > the dri device but then bails out with "no devices detected". > > > > Note: When vga_default_device() is set boot_vga PCI sysfs attribute > > reflects its state. When unset this attribute is 1 whenever > > IORESOURCE_ROM_SHADOW flag is set. > > > > With introduction of sysfb/simplefb/simpledrm efifb is getting obsolete > > while having native drivers for the GPU also makes selecting > > sysfb/efifb optional. > > > > Remove the efifb implementation of vga_default_device() and initialize > > vgaarb's vga_default_device() with the PCI GPU that matches boot > > screen_info in pci_fixup_video(). > > > > Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> > > --- > > arch/ia64/pci/fixup.c | 21 +++++++++++++++++++++ > > arch/x86/include/asm/vga.h | 6 ------ > > arch/x86/pci/fixup.c | 21 +++++++++++++++++++++ > > drivers/video/fbdev/efifb.c | 38 -------------------------------------- > > 4 files changed, 42 insertions(+), 44 deletions(-) > > Something went wrong here. It seems like the [2/2] patch should have > been [1/2], and this one should be [2/2]. And this one modifies both > arch/ia64/pci/fixup.c and arch/x86/pci/fixup.c, but the other patch > mostly combines them, so I don't see how this one applies. I ordered both patches the other way around from your explicit ordering proposal following the stable kernel suggestion following it. My patch 1/2 fixes the encountered issue and is the one that may go stable while my patch 2/2 performs unification of common code. The unification will need to be placed somewhere else than in vgaarb.c if one wants to keep current fixup working with CONFIG_VGA_ARB=n. > And there were unrelated (trivial) changes to these files, so they > need to be rebased to v3.16-rc1. I'd take care of the rebase, but > I don't understand the other stuff I mentioned. Ok Bruno > Bjorn > > > diff --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c > > index eee069a..9ed5bef 100644 > > --- a/arch/ia64/pci/fixup.c > > +++ b/arch/ia64/pci/fixup.c > > @@ -37,6 +37,27 @@ static void pci_fixup_video(struct pci_dev *pdev) > > return; > > /* Maybe, this machine supports legacy memory map. */ > > > > + if (!vga_default_device()) { > > + resource_size_t start, end; > > + int i; > > + > > + /* Does firmware framebuffer belong to us? */ > > + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > > + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) > > + continue; > > + > > + start = pci_resource_start(pdev, i); > > + end = pci_resource_end(pdev, i); > > + > > + if (!start || !end) > > + continue; > > + > > + if (screen_info.lfb_base >= start && > > + (screen_info.lfb_base + screen_info.lfb_size) < end) > > + vga_set_default_device(pdev); > > + } > > + } > > + > > /* Is VGA routed to us? */ > > bus = pdev->bus; > > while (bus) { > > diff --git a/arch/x86/include/asm/vga.h b/arch/x86/include/asm/vga.h > > index 44282fb..c4b9dc2 100644 > > --- a/arch/x86/include/asm/vga.h > > +++ b/arch/x86/include/asm/vga.h > > @@ -17,10 +17,4 @@ > > #define vga_readb(x) (*(x)) > > #define vga_writeb(x, y) (*(y) = (x)) > > > > -#ifdef CONFIG_FB_EFI > > -#define __ARCH_HAS_VGA_DEFAULT_DEVICE > > -extern struct pci_dev *vga_default_device(void); > > -extern void vga_set_default_device(struct pci_dev *pdev); > > -#endif > > - > > #endif /* _ASM_X86_VGA_H */ > > diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c > > index 94ae9ae..7246cf2 100644 > > --- a/arch/x86/pci/fixup.c > > +++ b/arch/x86/pci/fixup.c > > @@ -325,6 +325,27 @@ static void pci_fixup_video(struct pci_dev *pdev) > > struct pci_bus *bus; > > u16 config; > > > > + if (!vga_default_device()) { > > + resource_size_t start, end; > > + int i; > > + > > + /* Does firmware framebuffer belong to us? */ > > + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > > + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) > > + continue; > > + > > + start = pci_resource_start(pdev, i); > > + end = pci_resource_end(pdev, i); > > + > > + if (!start || !end) > > + continue; > > + > > + if (screen_info.lfb_base >= start && > > + (screen_info.lfb_base + screen_info.lfb_size) < end) > > + vga_set_default_device(pdev); > > + } > > + } > > + > > /* Is VGA routed to us? */ > > bus = pdev->bus; > > while (bus) { > > diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c > > index ae9618f..a033180 100644 > > --- a/drivers/video/fbdev/efifb.c > > +++ b/drivers/video/fbdev/efifb.c > > @@ -19,8 +19,6 @@ > > > > static bool request_mem_succeeded = false; > > > > -static struct pci_dev *default_vga; > > - > > static struct fb_var_screeninfo efifb_defined = { > > .activate = FB_ACTIVATE_NOW, > > .height = -1, > > @@ -84,18 +82,6 @@ static struct fb_ops efifb_ops = { > > .fb_imageblit = cfb_imageblit, > > }; > > > > -struct pci_dev *vga_default_device(void) > > -{ > > - return default_vga; > > -} > > - > > -EXPORT_SYMBOL_GPL(vga_default_device); > > - > > -void vga_set_default_device(struct pci_dev *pdev) > > -{ > > - default_vga = pdev; > > -} > > - > > static int efifb_setup(char *options) > > { > > char *this_opt; > > @@ -126,30 +112,6 @@ static int efifb_setup(char *options) > > } > > } > > > > - for_each_pci_dev(dev) { > > - int i; > > - > > - if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) > > - continue; > > - > > - for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > > - resource_size_t start, end; > > - > > - if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM)) > > - continue; > > - > > - start = pci_resource_start(dev, i); > > - end = pci_resource_end(dev, i); > > - > > - if (!start || !end) > > - continue; > > - > > - if (screen_info.lfb_base >= start && > > - (screen_info.lfb_base + screen_info.lfb_size) < end) > > - default_vga = dev; > > - } > > - } > > - > > return 0; > > } > > > > -- > > 1.8.5.5 > >
On Mon, 02 June 2014 Bruno Prémont <bonbons@linux-vserver.org> wrote: > With commit b4aa0163056b ("efifb: Implement vga_default_device() (v2)") > Matthew Garrett introduced a efifb vga_default_device() so that EFI > systems that do not load shadow VBIOS or setup VGA get proper value for > boot_vga PCI sysfs attribute on the corresponding PCI device. > > Xorg is refusing to detect devices when boot_vga=0 which is the case on > some EFI system (e.g. MacBookAir2,1). Xorg detects the GPU and finds > the dri device but then bails out with "no devices detected". > > Note: When vga_default_device() is set boot_vga PCI sysfs attribute > reflects its state. When unset this attribute is 1 whenever > IORESOURCE_ROM_SHADOW flag is set. > > With introduction of sysfb/simplefb/simpledrm efifb is getting obsolete > while having native drivers for the GPU also makes selecting > sysfb/efifb optional. > > Remove the efifb implementation of vga_default_device() and initialize > vgaarb's vga_default_device() with the PCI GPU that matches boot > screen_info in pci_fixup_video(). Quite a few people trip over this issue, apparently concentrated on Apple Macs (EFI) with Nvidia graphics. It has shown up in at least two bugzilla reports (as side-issue): https://bugs.freedesktop.org/show_bug.cgi?id=58556#c16 https://bugs.freedesktop.org/show_bug.cgi?id=76732#c34 My initial report and discussion on freenode, #nouveau: http://people.freedesktop.org/~cbrill/dri-log/?channel=nouveau&date=2013-11-23 followed by initial patch proposal: http://permalink.gmane.org/gmane.comp.video.dri.devel/95943 From today on #nouveau: Tested-by: Anibal Francisco Martinez Cortina <linuxkid.zeuz@gmail.com> As reported on #nouveau, every now and then someone trips over this issue and falls back to enabling efifb so X server accepts to start without explicit configuration. It would also be worth to add for first patch: Cc: stable@vger.kernel.org Bruno > Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> > --- > arch/ia64/pci/fixup.c | 21 +++++++++++++++++++++ > arch/x86/include/asm/vga.h | 6 ------ > arch/x86/pci/fixup.c | 21 +++++++++++++++++++++ > drivers/video/fbdev/efifb.c | 38 -------------------------------------- > 4 files changed, 42 insertions(+), 44 deletions(-) > > diff --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c > index eee069a..9ed5bef 100644 > --- a/arch/ia64/pci/fixup.c > +++ b/arch/ia64/pci/fixup.c > @@ -37,6 +37,27 @@ static void pci_fixup_video(struct pci_dev *pdev) > return; > /* Maybe, this machine supports legacy memory map. */ > > + if (!vga_default_device()) { > + resource_size_t start, end; > + int i; > + > + /* Does firmware framebuffer belong to us? */ > + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) > + continue; > + > + start = pci_resource_start(pdev, i); > + end = pci_resource_end(pdev, i); > + > + if (!start || !end) > + continue; > + > + if (screen_info.lfb_base >= start && > + (screen_info.lfb_base + screen_info.lfb_size) < end) > + vga_set_default_device(pdev); > + } > + } > + > /* Is VGA routed to us? */ > bus = pdev->bus; > while (bus) { > diff --git a/arch/x86/include/asm/vga.h b/arch/x86/include/asm/vga.h > index 44282fb..c4b9dc2 100644 > --- a/arch/x86/include/asm/vga.h > +++ b/arch/x86/include/asm/vga.h > @@ -17,10 +17,4 @@ > #define vga_readb(x) (*(x)) > #define vga_writeb(x, y) (*(y) = (x)) > > -#ifdef CONFIG_FB_EFI > -#define __ARCH_HAS_VGA_DEFAULT_DEVICE > -extern struct pci_dev *vga_default_device(void); > -extern void vga_set_default_device(struct pci_dev *pdev); > -#endif > - > #endif /* _ASM_X86_VGA_H */ > diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c > index 94ae9ae..7246cf2 100644 > --- a/arch/x86/pci/fixup.c > +++ b/arch/x86/pci/fixup.c > @@ -325,6 +325,27 @@ static void pci_fixup_video(struct pci_dev *pdev) > struct pci_bus *bus; > u16 config; > > + if (!vga_default_device()) { > + resource_size_t start, end; > + int i; > + > + /* Does firmware framebuffer belong to us? */ > + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) > + continue; > + > + start = pci_resource_start(pdev, i); > + end = pci_resource_end(pdev, i); > + > + if (!start || !end) > + continue; > + > + if (screen_info.lfb_base >= start && > + (screen_info.lfb_base + screen_info.lfb_size) < end) > + vga_set_default_device(pdev); > + } > + } > + > /* Is VGA routed to us? */ > bus = pdev->bus; > while (bus) { > diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c > index ae9618f..a033180 100644 > --- a/drivers/video/fbdev/efifb.c > +++ b/drivers/video/fbdev/efifb.c > @@ -19,8 +19,6 @@ > > static bool request_mem_succeeded = false; > > -static struct pci_dev *default_vga; > - > static struct fb_var_screeninfo efifb_defined = { > .activate = FB_ACTIVATE_NOW, > .height = -1, > @@ -84,18 +82,6 @@ static struct fb_ops efifb_ops = { > .fb_imageblit = cfb_imageblit, > }; > > -struct pci_dev *vga_default_device(void) > -{ > - return default_vga; > -} > - > -EXPORT_SYMBOL_GPL(vga_default_device); > - > -void vga_set_default_device(struct pci_dev *pdev) > -{ > - default_vga = pdev; > -} > - > static int efifb_setup(char *options) > { > char *this_opt; > @@ -126,30 +112,6 @@ static int efifb_setup(char *options) > } > } > > - for_each_pci_dev(dev) { > - int i; > - > - if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) > - continue; > - > - for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { > - resource_size_t start, end; > - > - if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM)) > - continue; > - > - start = pci_resource_start(dev, i); > - end = pci_resource_end(dev, i); > - > - if (!start || !end) > - continue; > - > - if (screen_info.lfb_base >= start && > - (screen_info.lfb_base + screen_info.lfb_size) < end) > - default_vga = dev; > - } > - } > - > return 0; > } >
diff --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c index eee069a..9ed5bef 100644 --- a/arch/ia64/pci/fixup.c +++ b/arch/ia64/pci/fixup.c @@ -37,6 +37,27 @@ static void pci_fixup_video(struct pci_dev *pdev) return; /* Maybe, this machine supports legacy memory map. */ + if (!vga_default_device()) { + resource_size_t start, end; + int i; + + /* Does firmware framebuffer belong to us? */ + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) + continue; + + start = pci_resource_start(pdev, i); + end = pci_resource_end(pdev, i); + + if (!start || !end) + continue; + + if (screen_info.lfb_base >= start && + (screen_info.lfb_base + screen_info.lfb_size) < end) + vga_set_default_device(pdev); + } + } + /* Is VGA routed to us? */ bus = pdev->bus; while (bus) { diff --git a/arch/x86/include/asm/vga.h b/arch/x86/include/asm/vga.h index 44282fb..c4b9dc2 100644 --- a/arch/x86/include/asm/vga.h +++ b/arch/x86/include/asm/vga.h @@ -17,10 +17,4 @@ #define vga_readb(x) (*(x)) #define vga_writeb(x, y) (*(y) = (x)) -#ifdef CONFIG_FB_EFI -#define __ARCH_HAS_VGA_DEFAULT_DEVICE -extern struct pci_dev *vga_default_device(void); -extern void vga_set_default_device(struct pci_dev *pdev); -#endif - #endif /* _ASM_X86_VGA_H */ diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c index 94ae9ae..7246cf2 100644 --- a/arch/x86/pci/fixup.c +++ b/arch/x86/pci/fixup.c @@ -325,6 +325,27 @@ static void pci_fixup_video(struct pci_dev *pdev) struct pci_bus *bus; u16 config; + if (!vga_default_device()) { + resource_size_t start, end; + int i; + + /* Does firmware framebuffer belong to us? */ + for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { + if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) + continue; + + start = pci_resource_start(pdev, i); + end = pci_resource_end(pdev, i); + + if (!start || !end) + continue; + + if (screen_info.lfb_base >= start && + (screen_info.lfb_base + screen_info.lfb_size) < end) + vga_set_default_device(pdev); + } + } + /* Is VGA routed to us? */ bus = pdev->bus; while (bus) { diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index ae9618f..a033180 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -19,8 +19,6 @@ static bool request_mem_succeeded = false; -static struct pci_dev *default_vga; - static struct fb_var_screeninfo efifb_defined = { .activate = FB_ACTIVATE_NOW, .height = -1, @@ -84,18 +82,6 @@ static struct fb_ops efifb_ops = { .fb_imageblit = cfb_imageblit, }; -struct pci_dev *vga_default_device(void) -{ - return default_vga; -} - -EXPORT_SYMBOL_GPL(vga_default_device); - -void vga_set_default_device(struct pci_dev *pdev) -{ - default_vga = pdev; -} - static int efifb_setup(char *options) { char *this_opt; @@ -126,30 +112,6 @@ static int efifb_setup(char *options) } } - for_each_pci_dev(dev) { - int i; - - if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) - continue; - - for (i=0; i < DEVICE_COUNT_RESOURCE; i++) { - resource_size_t start, end; - - if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM)) - continue; - - start = pci_resource_start(dev, i); - end = pci_resource_end(dev, i); - - if (!start || !end) - continue; - - if (screen_info.lfb_base >= start && - (screen_info.lfb_base + screen_info.lfb_size) < end) - default_vga = dev; - } - } - return 0; }
With commit b4aa0163056b ("efifb: Implement vga_default_device() (v2)") Matthew Garrett introduced a efifb vga_default_device() so that EFI systems that do not load shadow VBIOS or setup VGA get proper value for boot_vga PCI sysfs attribute on the corresponding PCI device. Xorg is refusing to detect devices when boot_vga=0 which is the case on some EFI system (e.g. MacBookAir2,1). Xorg detects the GPU and finds the dri device but then bails out with "no devices detected". Note: When vga_default_device() is set boot_vga PCI sysfs attribute reflects its state. When unset this attribute is 1 whenever IORESOURCE_ROM_SHADOW flag is set. With introduction of sysfb/simplefb/simpledrm efifb is getting obsolete while having native drivers for the GPU also makes selecting sysfb/efifb optional. Remove the efifb implementation of vga_default_device() and initialize vgaarb's vga_default_device() with the PCI GPU that matches boot screen_info in pci_fixup_video(). Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org> --- arch/ia64/pci/fixup.c | 21 +++++++++++++++++++++ arch/x86/include/asm/vga.h | 6 ------ arch/x86/pci/fixup.c | 21 +++++++++++++++++++++ drivers/video/fbdev/efifb.c | 38 -------------------------------------- 4 files changed, 42 insertions(+), 44 deletions(-)