| Message ID | 20171013034729.14630.30419.stgit@bhelgaas-glaptop.roam.corp.google.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | vgaarb: Select fallback default VGA device | expand |
Bjorn Helgaas <bhelgaas@google.com> writes: > The default VGA device is normally set in vga_arbiter_add_pci_device() when > we call it for the first enabled device that can be accessed with the > legacy VGA resources ([mem 0xa0000-0xbffff], etc.) > > That default device can be overridden by an EFI device that owns the boot > framebuffer. As a fallback, we can also select a VGA device that can't be > accessed via legacy VGA resources, or a VGA device that isn't even enabled. > > Factor out this EFI and fallback selection from vga_arb_device_init() into > a separate vga_arb_select_default_device() function. This doesn't change > any behavior, but it untangles the "bridge control possible" checking and > messages from the default device selection. > > Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08 > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > --- > drivers/gpu/vga/vgaarb.c | 57 ++++++++++++++++++++++++++++------------------ > 1 file changed, 35 insertions(+), 22 deletions(-) > > diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c > index 8035e38d5110..d35d6d271f3f 100644 > --- a/drivers/gpu/vga/vgaarb.c > +++ b/drivers/gpu/vga/vgaarb.c > @@ -1402,29 +1402,14 @@ static struct miscdevice vga_arb_device = { > MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops > }; > > -static int __init vga_arb_device_init(void) > +static void __init vga_arb_select_default_device(void) > { > - int rc; > struct pci_dev *pdev; > struct vga_device *vgadev; > > - rc = misc_register(&vga_arb_device); > - if (rc < 0) > - pr_err("error %d registering device\n", rc); > - > - bus_register_notifier(&pci_bus_type, &pci_notifier); > - > - /* We add all pci devices satisfying vga class in the arbiter by > - * default */ > - pdev = NULL; > - while ((pdev = > - pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, > - PCI_ANY_ID, pdev)) != NULL) > - vga_arbiter_add_pci_device(pdev); > - > +#if defined(CONFIG_X86) || defined(CONFIG_IA64) > list_for_each_entry(vgadev, &vga_list, list) { > struct device *dev = &vgadev->pdev->dev; > -#if defined(CONFIG_X86) || defined(CONFIG_IA64) > /* > * Override vga_arbiter_add_pci_device()'s I/O based detection > * as it may take the wrong device (e.g. on Apple system under > @@ -1461,12 +1446,8 @@ static int __init vga_arb_device_init(void) > vgaarb_info(dev, "overriding boot device\n"); > vga_set_default_device(vgadev->pdev); > } > -#endif > - if (vgadev->bridge_has_one_vga) > - vgaarb_info(dev, "bridge control possible\n"); > - else > - vgaarb_info(dev, "no bridge control possible\n"); > } > +#endif > > if (!vga_default_device()) { > list_for_each_entry(vgadev, &vga_list, list) { > @@ -1492,6 +1473,38 @@ static int __init vga_arb_device_init(void) > vga_set_default_device(vgadev->pdev); > } > } > +} > + > +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) > + pr_err("error %d registering device\n", rc); > + > + bus_register_notifier(&pci_bus_type, &pci_notifier); > + > + /* We add all PCI devices satisfying VGA class in the arbiter by > + * default */ > + pdev = NULL; > + while ((pdev = > + pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, > + 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"); > + } Initially I wondered if this info printk could be moved into vga_arbiter_check_bridge_sharing(), but it's been separated out since 3448a19da479b ("vgaarb: use bridges to control VGA routing where possible."), and upon closer examination, it seems you can't be sure a device doesn't share a bridge until the end of the process, so this is indeed correct. Everything else also looks good to me. Reviewed-by: Daniel Axtens <dja@axtens.net> Regards, Daniel > + > + vga_arb_select_default_device(); > > pr_info("loaded\n"); > return rc;
On Tue, Oct 17, 2017 at 01:03:46PM +1100, Daniel Axtens wrote: > Bjorn Helgaas <bhelgaas@google.com> writes: > > > The default VGA device is normally set in vga_arbiter_add_pci_device() when > > we call it for the first enabled device that can be accessed with the > > legacy VGA resources ([mem 0xa0000-0xbffff], etc.) > > > > That default device can be overridden by an EFI device that owns the boot > > framebuffer. As a fallback, we can also select a VGA device that can't be > > accessed via legacy VGA resources, or a VGA device that isn't even enabled. > > > > Factor out this EFI and fallback selection from vga_arb_device_init() into > > a separate vga_arb_select_default_device() function. This doesn't change > > any behavior, but it untangles the "bridge control possible" checking and > > messages from the default device selection. > > > > Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08 > > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > > --- > > drivers/gpu/vga/vgaarb.c | 57 ++++++++++++++++++++++++++++------------------ > > 1 file changed, 35 insertions(+), 22 deletions(-) > > > > diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c > > index 8035e38d5110..d35d6d271f3f 100644 > > --- a/drivers/gpu/vga/vgaarb.c > > +++ b/drivers/gpu/vga/vgaarb.c > > @@ -1402,29 +1402,14 @@ static struct miscdevice vga_arb_device = { > > MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops > > }; > > > > -static int __init vga_arb_device_init(void) > > +static void __init vga_arb_select_default_device(void) > > { > > - int rc; > > struct pci_dev *pdev; > > struct vga_device *vgadev; > > > > - rc = misc_register(&vga_arb_device); > > - if (rc < 0) > > - pr_err("error %d registering device\n", rc); > > - > > - bus_register_notifier(&pci_bus_type, &pci_notifier); > > - > > - /* We add all pci devices satisfying vga class in the arbiter by > > - * default */ > > - pdev = NULL; > > - while ((pdev = > > - pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, > > - PCI_ANY_ID, pdev)) != NULL) > > - vga_arbiter_add_pci_device(pdev); > > - > > +#if defined(CONFIG_X86) || defined(CONFIG_IA64) > > list_for_each_entry(vgadev, &vga_list, list) { > > struct device *dev = &vgadev->pdev->dev; > > -#if defined(CONFIG_X86) || defined(CONFIG_IA64) > > /* > > * Override vga_arbiter_add_pci_device()'s I/O based detection > > * as it may take the wrong device (e.g. on Apple system under > > @@ -1461,12 +1446,8 @@ static int __init vga_arb_device_init(void) > > vgaarb_info(dev, "overriding boot device\n"); > > vga_set_default_device(vgadev->pdev); > > } > > -#endif > > - if (vgadev->bridge_has_one_vga) > > - vgaarb_info(dev, "bridge control possible\n"); > > - else > > - vgaarb_info(dev, "no bridge control possible\n"); > > } > > +#endif > > > > if (!vga_default_device()) { > > list_for_each_entry(vgadev, &vga_list, list) { > > @@ -1492,6 +1473,38 @@ static int __init vga_arb_device_init(void) > > vga_set_default_device(vgadev->pdev); > > } > > } > > +} > > + > > +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) > > + pr_err("error %d registering device\n", rc); > > + > > + bus_register_notifier(&pci_bus_type, &pci_notifier); > > + > > + /* We add all PCI devices satisfying VGA class in the arbiter by > > + * default */ > > + pdev = NULL; > > + while ((pdev = > > + pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, > > + 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"); > > + } > > Initially I wondered if this info printk could be moved into > vga_arbiter_check_bridge_sharing(), but it's been separated out since > 3448a19da479b ("vgaarb: use bridges to control VGA routing where > possible."), and upon closer examination, it seems you can't be sure a > device doesn't share a bridge until the end of the process, so this is > indeed correct. > > Everything else also looks good to me. > > Reviewed-by: Daniel Axtens <dja@axtens.net> R-b for both patches? And ok with everyone if I pull this into drm-misc for 4.15 (deadline is end of this week for feature-y stuff)? Thanks, Daniel
On 17 October 2017 at 13:05, Daniel Vetter <daniel@ffwll.ch> wrote: > On Tue, Oct 17, 2017 at 01:03:46PM +1100, Daniel Axtens wrote: >> Bjorn Helgaas <bhelgaas@google.com> writes: >> >> > The default VGA device is normally set in vga_arbiter_add_pci_device() when >> > we call it for the first enabled device that can be accessed with the >> > legacy VGA resources ([mem 0xa0000-0xbffff], etc.) >> > >> > That default device can be overridden by an EFI device that owns the boot >> > framebuffer. As a fallback, we can also select a VGA device that can't be >> > accessed via legacy VGA resources, or a VGA device that isn't even enabled. >> > >> > Factor out this EFI and fallback selection from vga_arb_device_init() into >> > a separate vga_arb_select_default_device() function. This doesn't change >> > any behavior, but it untangles the "bridge control possible" checking and >> > messages from the default device selection. >> > >> > Tested-by: Zhou Wang <wangzhou1@hisilicon.com> # D05 Hisi Hip07, Hip08 >> > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> >> > --- >> > drivers/gpu/vga/vgaarb.c | 57 ++++++++++++++++++++++++++++------------------ >> > 1 file changed, 35 insertions(+), 22 deletions(-) >> > >> > diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c >> > index 8035e38d5110..d35d6d271f3f 100644 >> > --- a/drivers/gpu/vga/vgaarb.c >> > +++ b/drivers/gpu/vga/vgaarb.c >> > @@ -1402,29 +1402,14 @@ static struct miscdevice vga_arb_device = { >> > MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops >> > }; >> > >> > -static int __init vga_arb_device_init(void) >> > +static void __init vga_arb_select_default_device(void) >> > { >> > - int rc; >> > struct pci_dev *pdev; >> > struct vga_device *vgadev; >> > >> > - rc = misc_register(&vga_arb_device); >> > - if (rc < 0) >> > - pr_err("error %d registering device\n", rc); >> > - >> > - bus_register_notifier(&pci_bus_type, &pci_notifier); >> > - >> > - /* We add all pci devices satisfying vga class in the arbiter by >> > - * default */ >> > - pdev = NULL; >> > - while ((pdev = >> > - pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, >> > - PCI_ANY_ID, pdev)) != NULL) >> > - vga_arbiter_add_pci_device(pdev); >> > - >> > +#if defined(CONFIG_X86) || defined(CONFIG_IA64) >> > list_for_each_entry(vgadev, &vga_list, list) { >> > struct device *dev = &vgadev->pdev->dev; >> > -#if defined(CONFIG_X86) || defined(CONFIG_IA64) >> > /* >> > * Override vga_arbiter_add_pci_device()'s I/O based detection >> > * as it may take the wrong device (e.g. on Apple system under >> > @@ -1461,12 +1446,8 @@ static int __init vga_arb_device_init(void) >> > vgaarb_info(dev, "overriding boot device\n"); >> > vga_set_default_device(vgadev->pdev); >> > } >> > -#endif >> > - if (vgadev->bridge_has_one_vga) >> > - vgaarb_info(dev, "bridge control possible\n"); >> > - else >> > - vgaarb_info(dev, "no bridge control possible\n"); >> > } >> > +#endif >> > >> > if (!vga_default_device()) { >> > list_for_each_entry(vgadev, &vga_list, list) { >> > @@ -1492,6 +1473,38 @@ static int __init vga_arb_device_init(void) >> > vga_set_default_device(vgadev->pdev); >> > } >> > } >> > +} >> > + >> > +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) >> > + pr_err("error %d registering device\n", rc); >> > + >> > + bus_register_notifier(&pci_bus_type, &pci_notifier); >> > + >> > + /* We add all PCI devices satisfying VGA class in the arbiter by >> > + * default */ >> > + pdev = NULL; >> > + while ((pdev = >> > + pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, >> > + 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"); >> > + } >> >> Initially I wondered if this info printk could be moved into >> vga_arbiter_check_bridge_sharing(), but it's been separated out since >> 3448a19da479b ("vgaarb: use bridges to control VGA routing where >> possible."), and upon closer examination, it seems you can't be sure a >> device doesn't share a bridge until the end of the process, so this is >> indeed correct. >> >> Everything else also looks good to me. >> >> Reviewed-by: Daniel Axtens <dja@axtens.net> > > R-b for both patches? And ok with everyone if I pull this into drm-misc > for 4.15 (deadline is end of this week for feature-y stuff)? > For both patches Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Hi Daniel, >> Initially I wondered if this info printk could be moved into >> vga_arbiter_check_bridge_sharing(), but it's been separated out since >> 3448a19da479b ("vgaarb: use bridges to control VGA routing where >> possible."), and upon closer examination, it seems you can't be sure a >> device doesn't share a bridge until the end of the process, so this is >> indeed correct. >> >> Everything else also looks good to me. >> >> Reviewed-by: Daniel Axtens <dja@axtens.net> > > R-b for both patches? And ok with everyone if I pull this into drm-misc > for 4.15 (deadline is end of this week for feature-y stuff)? I had only intended it for patch 2, but I've now read over patch 1 to my satisfaction, so it too is: Reviewed-by: Daniel Axtens <dja@axtens.net> Thanks! Regards, Daniel > > Thanks, Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch
On Wed, Oct 18, 2017 at 11:24:43AM +1100, Daniel Axtens wrote: > Hi Daniel, > > >> Initially I wondered if this info printk could be moved into > >> vga_arbiter_check_bridge_sharing(), but it's been separated out since > >> 3448a19da479b ("vgaarb: use bridges to control VGA routing where > >> possible."), and upon closer examination, it seems you can't be sure a > >> device doesn't share a bridge until the end of the process, so this is > >> indeed correct. > >> > >> Everything else also looks good to me. > >> > >> Reviewed-by: Daniel Axtens <dja@axtens.net> > > > > R-b for both patches? And ok with everyone if I pull this into drm-misc > > for 4.15 (deadline is end of this week for feature-y stuff)? > > I had only intended it for patch 2, but I've now read over patch 1 to my > satisfaction, so it too is: > > Reviewed-by: Daniel Axtens <dja@axtens.net> Both applied for 4.15, thanks. -Daniel
Daniel Vetter <daniel@ffwll.ch> writes: > On Wed, Oct 18, 2017 at 11:24:43AM +1100, Daniel Axtens wrote: >> Hi Daniel, >> >> >> Initially I wondered if this info printk could be moved into >> >> vga_arbiter_check_bridge_sharing(), but it's been separated out since >> >> 3448a19da479b ("vgaarb: use bridges to control VGA routing where >> >> possible."), and upon closer examination, it seems you can't be sure a >> >> device doesn't share a bridge until the end of the process, so this is >> >> indeed correct. >> >> >> >> Everything else also looks good to me. >> >> >> >> Reviewed-by: Daniel Axtens <dja@axtens.net> >> > >> > R-b for both patches? And ok with everyone if I pull this into drm-misc >> > for 4.15 (deadline is end of this week for feature-y stuff)? >> >> I had only intended it for patch 2, but I've now read over patch 1 to my >> satisfaction, so it too is: >> >> Reviewed-by: Daniel Axtens <dja@axtens.net> > > Both applied for 4.15, thanks. Cool - thanks! A special thanks to Bjorn for persisting with this and coming up with a nice simple solution :) Regards, Daniel > -Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c index 8035e38d5110..d35d6d271f3f 100644 --- a/drivers/gpu/vga/vgaarb.c +++ b/drivers/gpu/vga/vgaarb.c @@ -1402,29 +1402,14 @@ static struct miscdevice vga_arb_device = { MISC_DYNAMIC_MINOR, "vga_arbiter", &vga_arb_device_fops }; -static int __init vga_arb_device_init(void) +static void __init vga_arb_select_default_device(void) { - int rc; struct pci_dev *pdev; struct vga_device *vgadev; - rc = misc_register(&vga_arb_device); - if (rc < 0) - pr_err("error %d registering device\n", rc); - - bus_register_notifier(&pci_bus_type, &pci_notifier); - - /* We add all pci devices satisfying vga class in the arbiter by - * default */ - pdev = NULL; - while ((pdev = - pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, - PCI_ANY_ID, pdev)) != NULL) - vga_arbiter_add_pci_device(pdev); - +#if defined(CONFIG_X86) || defined(CONFIG_IA64) list_for_each_entry(vgadev, &vga_list, list) { struct device *dev = &vgadev->pdev->dev; -#if defined(CONFIG_X86) || defined(CONFIG_IA64) /* * Override vga_arbiter_add_pci_device()'s I/O based detection * as it may take the wrong device (e.g. on Apple system under @@ -1461,12 +1446,8 @@ static int __init vga_arb_device_init(void) vgaarb_info(dev, "overriding boot device\n"); vga_set_default_device(vgadev->pdev); } -#endif - if (vgadev->bridge_has_one_vga) - vgaarb_info(dev, "bridge control possible\n"); - else - vgaarb_info(dev, "no bridge control possible\n"); } +#endif if (!vga_default_device()) { list_for_each_entry(vgadev, &vga_list, list) { @@ -1492,6 +1473,38 @@ static int __init vga_arb_device_init(void) vga_set_default_device(vgadev->pdev); } } +} + +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) + pr_err("error %d registering device\n", rc); + + bus_register_notifier(&pci_bus_type, &pci_notifier); + + /* We add all PCI devices satisfying VGA class in the arbiter by + * default */ + pdev = NULL; + while ((pdev = + pci_get_subsys(PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, + 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"); + } + + vga_arb_select_default_device(); pr_info("loaded\n"); return rc;