This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport) --- drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na
primary = pdev == vga_default_device();
+ if (primary) + sysfb_disable(); + for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue;
base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar); - ret = aperture_remove_conflicting_devices(base, size, name); - if (ret) - return ret; + aperture_detach_devices(base, size); }
if (!primary)
Hi
Am 11.01.23 um 16:41 schrieb Daniel Vetter:
This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport)
drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device();
- if (primary)
sysfb_disable();
There's another sysfb_disable() in aperture_remove_conflicting_devices() without the branch but with a long comment. I find this slightly confusing.
I'd rather add a branched sysfb_disable() plus the comment to aperture_detach_devices(). And then add a 'primary' parameter to aperture_detach_devices(). In aperture_remove_conflicting_devices() the parameter would be unconditionally true.
Best regards Thomas
for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue; base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar);
ret = aperture_remove_conflicting_devices(base, size, name);if (ret)return ret;
aperture_detach_devices(base, size);if (!primary)
On Wed, Jan 11, 2023 at 05:20:00PM +0100, Thomas Zimmermann wrote:
Hi
Am 11.01.23 um 16:41 schrieb Daniel Vetter:
This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport)
drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device();
- if (primary)
sysfb_disable();There's another sysfb_disable() in aperture_remove_conflicting_devices() without the branch but with a long comment. I find this slightly confusing.
I'd rather add a branched sysfb_disable() plus the comment to aperture_detach_devices(). And then add a 'primary' parameter to aperture_detach_devices(). In aperture_remove_conflicting_devices() the parameter would be unconditionally true.
Yeah I was on the fence, but should be easy to redo with all the prep work out of the way. It does mean we call sysfb_disable once for every bar, but that shouldn't matter in any reasonable case :-) -Daniel
Best regards Thomas
for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue; base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar);
ret = aperture_remove_conflicting_devices(base, size, name);if (ret)return ret;
aperture_detach_devices(base, size);-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
Hi
Am 11.01.23 um 17:37 schrieb Daniel Vetter:
On Wed, Jan 11, 2023 at 05:20:00PM +0100, Thomas Zimmermann wrote:
Hi
Am 11.01.23 um 16:41 schrieb Daniel Vetter:
This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport)
drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device();
- if (primary)
sysfb_disable();There's another sysfb_disable() in aperture_remove_conflicting_devices() without the branch but with a long comment. I find this slightly confusing.
I'd rather add a branched sysfb_disable() plus the comment to aperture_detach_devices(). And then add a 'primary' parameter to aperture_detach_devices(). In aperture_remove_conflicting_devices() the parameter would be unconditionally true.
Yeah I was on the fence, but should be easy to redo with all the prep work out of the way. It does mean we call sysfb_disable once for every bar, but that shouldn't matter in any reasonable case :-)
Or leave it as is. It's not so important. The idea of the current design was that aperture_remove_conflicting_device() would be the general implementation and aperture_remove_conflicting_pci_device() would be a helper that only detects the correct PCI BAR. That never really worked in practice.
Best regards Thomas
-Daniel
Best regards Thomas
for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue; base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar);
ret = aperture_remove_conflicting_devices(base, size, name);if (ret)return ret;
aperture_detach_devices(base, size);-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
On 1/11/23 17:20, Thomas Zimmermann wrote:
[...]
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device();
- if (primary)
sysfb_disable();There's another sysfb_disable() in aperture_remove_conflicting_devices() without the branch but with a long comment. I find this slightly confusing.
I'd rather add a branched sysfb_disable() plus the comment to aperture_detach_devices(). And then add a 'primary' parameter to aperture_detach_devices(). In aperture_remove_conflicting_devices() the parameter would be unconditionally true.
Or just remove that long comment since there's already kernel-doc for the sysfb_disable() function definition.
This feels to me that any approach to parameterize this will lead to code that is harder to read.
Since is just a single function call, I would just duplicate like $subject does to be honest.
Hello Daniel,
On 1/11/23 16:41, Daniel Vetter wrote:
This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
restore
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see
symptoms
https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
Maybe adding a Fixes: ee7a69aa38d8 tag here too ?
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport)
drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device();
- if (primary)
sysfb_disable();- for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue;
base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar);
ret = aperture_remove_conflicting_devices(base, size, name);if (ret)return ret;
aperture_detach_devices(base, size);
Maybe mention in the commit message that you are doing this change, something like:
"Instead of calling aperture_remove_conflicting_devices() to remove the conflicting devices, just call to aperture_detach_devices() to detach the device that matches the same PCI BAR / aperture range. Since the former is just a wrapper of the latter plus a sysfb_disable() call, and now that's done in this function but only for the primary devices"
Patch looks good to me:
Reviewed-by: Javier Martinez Canillas javierm@redhat.com
On 1/11/23 8:58 AM, Javier Martinez Canillas wrote:
Hello Daniel,
On 1/11/23 16:41, Daniel Vetter wrote:
This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
restore
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see
symptoms
https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
Maybe adding a Fixes: ee7a69aa38d8 tag here too ?
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport)
drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device();
- if (primary)
sysfb_disable();- for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue;
base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar);
ret = aperture_remove_conflicting_devices(base, size, name);if (ret)return ret;
aperture_detach_devices(base, size);Maybe mention in the commit message that you are doing this change, something like:
"Instead of calling aperture_remove_conflicting_devices() to remove the conflicting devices, just call to aperture_detach_devices() to detach the device that matches the same PCI BAR / aperture range. Since the former is just a wrapper of the latter plus a sysfb_disable() call, and now that's done in this function but only for the primary devices"
Patch looks good to me:
Reviewed-by: Javier Martinez Canillas javierm@redhat.com
Thanks Daniel and Javier!
I wasn't able to reproduce the original problem on my hybrid laptop since it refuses to boot with the console on an external display, but I was able to reproduce it by switching the configuration around: booting with i915.modeset=0 and with an experimental version of nvidia-drm that registers a framebuffer console. I verified that loading nvidia-drm breaks the efi-firmware framebuffer on Intel on Arch's linux-6.1.4-arch1-1 kernel and that applying this patch series fixes it. So
Tested-by: Aaron Plattner aplattner@nvidia.com
FWIW, the bug ought to be reproducible with i915.modeset=0 + any other drm driver that registers a framebuffer.
-- Aaron
Hi
Am 11.01.23 um 20:21 schrieb Aaron Plattner:
On 1/11/23 8:58 AM, Javier Martinez Canillas wrote:
Hello Daniel,
On 1/11/23 16:41, Daniel Vetter wrote:
This fixes a regression introduced by ee7a69aa38d8 ("fbdev: Disable sysfb device registration when removing conflicting FBs"), where we remove the sysfb when loading a driver for an unrelated pci device, resulting in the user loosing their efifb console or similar.
Note that in practice this only is a problem with the nvidia blob, because that's the only gpu driver people might install which does not come with an fbdev driver of it's own. For everyone else the real gpu driver will restor a working console.
restore
Also note that in the referenced bug there's confusion that this same bug also happens on amdgpu. But that was just another amdgpu specific regression, which just happened to happen at roughly the same time and with the same user-observable symptons. That bug is fixed now, see
symptoms
https://bugzilla.kernel.org/show_bug.cgi?id=216331#c15
For the above reasons the cc: stable is just notionally, this patch will need a backport and that's up to nvidia if they care enough.
Maybe adding a Fixes: ee7a69aa38d8 tag here too ?
References: https://bugzilla.kernel.org/show_bug.cgi?id=216303#c28 Signed-off-by: Daniel Vetter daniel.vetter@intel.com Cc: Aaron Plattner aplattner@nvidia.com Cc: Javier Martinez Canillas javierm@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Helge Deller deller@gmx.de Cc: Sam Ravnborg sam@ravnborg.org Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org # v5.19+ (if someone else does the backport)
drivers/video/aperture.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c index ba565515480d..a1821d369bb1 100644 --- a/drivers/video/aperture.c +++ b/drivers/video/aperture.c @@ -321,15 +321,16 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na primary = pdev == vga_default_device(); + if (primary) + sysfb_disable();
for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) { if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) continue; base = pci_resource_start(pdev, bar); size = pci_resource_len(pdev, bar); - ret = aperture_remove_conflicting_devices(base, size, name); - if (ret) - return ret; + aperture_detach_devices(base, size);
Maybe mention in the commit message that you are doing this change, something like:
"Instead of calling aperture_remove_conflicting_devices() to remove the conflicting devices, just call to aperture_detach_devices() to detach the device that matches the same PCI BAR / aperture range. Since the former is just a wrapper of the latter plus a sysfb_disable() call, and now that's done in this function but only for the primary devices"
Patch looks good to me:
Reviewed-by: Javier Martinez Canillas javierm@redhat.com
Thanks Daniel and Javier!
I wasn't able to reproduce the original problem on my hybrid laptop since it refuses to boot with the console on an external display, but I was able to reproduce it by switching the configuration around: booting with i915.modeset=0 and with an experimental version of nvidia-drm that registers a framebuffer console. I verified that loading nvidia-drm
Thank you for testing.
One thing I'd like to note is that using DRM's fbdev emulation is the correct way to support a console. Nvidia-drm's current approach of utilizing efifb is fragile and requires workarounds from distributions (at least here at SUSE). Steps towards fbdev emulation are much appreciated.
Best regards Thomas
breaks the efi-firmware framebuffer on Intel on Arch's linux-6.1.4-arch1-1 kernel and that applying this patch series fixes it. So
Tested-by: Aaron Plattner aplattner@nvidia.com
FWIW, the bug ought to be reproducible with i915.modeset=0 + any other drm driver that registers a framebuffer.
-- Aaron
On 1/12/23 08:55, Thomas Zimmermann wrote:
[...]
Thanks Daniel and Javier!
I wasn't able to reproduce the original problem on my hybrid laptop since it refuses to boot with the console on an external display, but I was able to reproduce it by switching the configuration around: booting with i915.modeset=0 and with an experimental version of nvidia-drm that registers a framebuffer console. I verified that loading nvidia-drm
Thank you for testing.
One thing I'd like to note is that using DRM's fbdev emulation is the correct way to support a console. Nvidia-drm's current approach of utilizing efifb is fragile and requires workarounds from distributions (at least here at SUSE). Steps towards fbdev emulation are much appreciated.
I was meaning to mention the same. Fedora also is carrying a workaround just for the Nvidia proprietary driver since all other drivers provide a emulated fbdev device.
So getting this finally fixed will be indeed highly appreciated.
linux-stable-mirror@lists.linaro.org
-
Aaron Plattner -
Daniel Vetter -
Daniel Vetter -
Javier Martinez Canillas -
Thomas Zimmermann