diff mbox

drm: virtio: reinstate drm_virtio_set_busid()

Message ID 20161003174303.4839-1-lersek@redhat.com
State New
Headers show

Commit Message

Laszlo Ersek Oct. 3, 2016, 5:43 p.m. UTC
Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci
drivers"), several DRM drivers for platform devices used to expose an
explicit "drm_driver.set_busid" callback, invariably backed by
drm_platform_set_busid().

Commit a325725633c2 removed drm_platform_set_busid(), along with the
referring .set_busid field initializations. This was justified because
interchangeable functionality had been implemented in drm_dev_alloc() /
drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.

However, commit a325725633c2 also removed drm_virtio_set_busid(), for
which the same consolidation was not appropriate: this .set_busid callback
had been implemented with drm_pci_set_busid(), and not
drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's
"virtio-vga" card; the drmGetBusid() function from libdrm would no longer
return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable
platform ones like "virtio0".

Reinstate drm_virtio_set_busid() with judicious use of

  git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: David Airlie <airlied@redhat.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Joachim Frieben <jfrieben@hotmail.com>
Cc: stable@vger.kernel.org
Reported-by: Joachim Frieben <jfrieben@hotmail.com>
Fixes: a325725633c26aa66ab940f762a6b0778edf76c0
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

---
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++
 drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +
 drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +
 3 files changed, 12 insertions(+)

-- 
2.9.2

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Comments

Laszlo Ersek Oct. 17, 2016, 9:10 p.m. UTC | #1
Greg,

On 10/03/16 19:43, Laszlo Ersek wrote:
> Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci

> drivers"), several DRM drivers for platform devices used to expose an

> explicit "drm_driver.set_busid" callback, invariably backed by

> drm_platform_set_busid().

> 

> Commit a325725633c2 removed drm_platform_set_busid(), along with the

> referring .set_busid field initializations. This was justified because

> interchangeable functionality had been implemented in drm_dev_alloc() /

> drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.

> 

> However, commit a325725633c2 also removed drm_virtio_set_busid(), for

> which the same consolidation was not appropriate: this .set_busid callback

> had been implemented with drm_pci_set_busid(), and not

> drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's

> "virtio-vga" card; the drmGetBusid() function from libdrm would no longer

> return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable

> platform ones like "virtio0".

> 

> Reinstate drm_virtio_set_busid() with judicious use of

> 

>   git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio

> 

> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

> Cc: Daniel Vetter <daniel.vetter@intel.com>

> Cc: David Airlie <airlied@redhat.com>

> Cc: Emil Velikov <emil.l.velikov@gmail.com>

> Cc: Gerd Hoffmann <kraxel@redhat.com>

> Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

> Cc: Hans de Goede <hdegoede@redhat.com>

> Cc: Joachim Frieben <jfrieben@hotmail.com>

> Cc: stable@vger.kernel.org

> Reported-by: Joachim Frieben <jfrieben@hotmail.com>

> Fixes: a325725633c26aa66ab940f762a6b0778edf76c0

> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842

> Signed-off-by: Laszlo Ersek <lersek@redhat.com>

> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

> ---

>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++

>  drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +

>  drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +

>  3 files changed, 12 insertions(+)


Is there any particular reason this patch hasn't been cherry-picked to
linux-4.8.y? (I checked v4.8.2.)

According to "Option 1" in "Documentation/stable_kernel_rules.txt", I
think it should have been.

Anyway, it is commit c2cbc38b9715bd8318062e600668fc30e5a3fbfa upstream;
please consider including it in v4.8.3.

(Daniel: my offer to test any further reworkings for this still stands;
just please send me patches that I can apply cleanly with git-am.)

Thanks!
Laszlo

> diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c

> index 7f0e93f87a55..88a39165edd5 100644

> --- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c

> +++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c

> @@ -27,6 +27,16 @@

>  

>  #include "virtgpu_drv.h"

>  

> +int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)

> +{

> +	struct pci_dev *pdev = dev->pdev;

> +

> +	if (pdev) {

> +		return drm_pci_set_busid(dev, master);

> +	}

> +	return 0;

> +}

> +

>  static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)

>  {

>  	struct apertures_struct *ap;

> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c

> index c13f70cfc461..5820b7020ae5 100644

> --- a/drivers/gpu/drm/virtio/virtgpu_drv.c

> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c

> @@ -117,6 +117,7 @@ static const struct file_operations virtio_gpu_driver_fops = {

>  

>  static struct drm_driver driver = {

>  	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER | DRIVER_ATOMIC,

> +	.set_busid = drm_virtio_set_busid,

>  	.load = virtio_gpu_driver_load,

>  	.unload = virtio_gpu_driver_unload,

>  	.open = virtio_gpu_driver_open,

> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h

> index b18ef3111f0c..acf556a35cb2 100644

> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h

> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h

> @@ -49,6 +49,7 @@

>  #define DRIVER_PATCHLEVEL 1

>  

>  /* virtgpu_drm_bus.c */

> +int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master);

>  int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev);

>  

>  struct virtio_gpu_object {

> 


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Greg Kroah-Hartman Oct. 18, 2016, 6:38 a.m. UTC | #2
On Mon, Oct 17, 2016 at 11:10:28PM +0200, Laszlo Ersek wrote:
> Greg,

> 

> On 10/03/16 19:43, Laszlo Ersek wrote:

> > Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci

> > drivers"), several DRM drivers for platform devices used to expose an

> > explicit "drm_driver.set_busid" callback, invariably backed by

> > drm_platform_set_busid().

> > 

> > Commit a325725633c2 removed drm_platform_set_busid(), along with the

> > referring .set_busid field initializations. This was justified because

> > interchangeable functionality had been implemented in drm_dev_alloc() /

> > drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.

> > 

> > However, commit a325725633c2 also removed drm_virtio_set_busid(), for

> > which the same consolidation was not appropriate: this .set_busid callback

> > had been implemented with drm_pci_set_busid(), and not

> > drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's

> > "virtio-vga" card; the drmGetBusid() function from libdrm would no longer

> > return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable

> > platform ones like "virtio0".

> > 

> > Reinstate drm_virtio_set_busid() with judicious use of

> > 

> >   git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio

> > 

> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

> > Cc: Daniel Vetter <daniel.vetter@intel.com>

> > Cc: David Airlie <airlied@redhat.com>

> > Cc: Emil Velikov <emil.l.velikov@gmail.com>

> > Cc: Gerd Hoffmann <kraxel@redhat.com>

> > Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

> > Cc: Hans de Goede <hdegoede@redhat.com>

> > Cc: Joachim Frieben <jfrieben@hotmail.com>

> > Cc: stable@vger.kernel.org

> > Reported-by: Joachim Frieben <jfrieben@hotmail.com>

> > Fixes: a325725633c26aa66ab940f762a6b0778edf76c0

> > Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842

> > Signed-off-by: Laszlo Ersek <lersek@redhat.com>

> > Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

> > ---

> >  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++

> >  drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +

> >  drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +

> >  3 files changed, 12 insertions(+)

> 

> Is there any particular reason this patch hasn't been cherry-picked to

> linux-4.8.y? (I checked v4.8.2.)


Yes, it just showed up in 4.9-rc1 3 days ago, give me a chance to catch
up!  I have 210 patches right now that are in this same status, you are
in good company.

Don't worry, it will eventually make it in, patience please...

greg k-h
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Laszlo Ersek Oct. 18, 2016, 3:52 p.m. UTC | #3
On 10/18/16 08:38, Greg Kroah-Hartman wrote:
> On Mon, Oct 17, 2016 at 11:10:28PM +0200, Laszlo Ersek wrote:

>> Greg,

>>

>> On 10/03/16 19:43, Laszlo Ersek wrote:

>>> Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci

>>> drivers"), several DRM drivers for platform devices used to expose an

>>> explicit "drm_driver.set_busid" callback, invariably backed by

>>> drm_platform_set_busid().

>>>

>>> Commit a325725633c2 removed drm_platform_set_busid(), along with the

>>> referring .set_busid field initializations. This was justified because

>>> interchangeable functionality had been implemented in drm_dev_alloc() /

>>> drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.

>>>

>>> However, commit a325725633c2 also removed drm_virtio_set_busid(), for

>>> which the same consolidation was not appropriate: this .set_busid callback

>>> had been implemented with drm_pci_set_busid(), and not

>>> drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's

>>> "virtio-vga" card; the drmGetBusid() function from libdrm would no longer

>>> return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable

>>> platform ones like "virtio0".

>>>

>>> Reinstate drm_virtio_set_busid() with judicious use of

>>>

>>>   git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio

>>>

>>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

>>> Cc: Daniel Vetter <daniel.vetter@intel.com>

>>> Cc: David Airlie <airlied@redhat.com>

>>> Cc: Emil Velikov <emil.l.velikov@gmail.com>

>>> Cc: Gerd Hoffmann <kraxel@redhat.com>

>>> Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

>>> Cc: Hans de Goede <hdegoede@redhat.com>

>>> Cc: Joachim Frieben <jfrieben@hotmail.com>

>>> Cc: stable@vger.kernel.org

>>> Reported-by: Joachim Frieben <jfrieben@hotmail.com>

>>> Fixes: a325725633c26aa66ab940f762a6b0778edf76c0

>>> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842

>>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>

>>> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

>>> ---

>>>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++

>>>  drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +

>>>  drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +

>>>  3 files changed, 12 insertions(+)

>>

>> Is there any particular reason this patch hasn't been cherry-picked to

>> linux-4.8.y? (I checked v4.8.2.)

> 

> Yes, it just showed up in 4.9-rc1 3 days ago, give me a chance to catch

> up!  I have 210 patches right now that are in this same status,


My apologies; I didn't realize the volume.

(
BTW I tried to fetch stable-queue this morning, and just now as well --
for some reason that git command seems consistently stuck for me. It
produces some low network traffic, but makes no progress:

> Looking up git.kernel.org ... done.

> Connecting to git.kernel.org (port 9418) ... 199.204.44.194 done.

> <stuck here>


Should I report this elsewhere and/or capture packets with tcpdump?
)

> you are

> in good company.


Always :)

Thanks!
Laszlo

> Don't worry, it will eventually make it in, patience please...

> 

> greg k-h

> 


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Greg Kroah-Hartman Oct. 18, 2016, 4:57 p.m. UTC | #4
On Tue, Oct 18, 2016 at 05:52:20PM +0200, Laszlo Ersek wrote:
> On 10/18/16 08:38, Greg Kroah-Hartman wrote:

> > On Mon, Oct 17, 2016 at 11:10:28PM +0200, Laszlo Ersek wrote:

> >> Greg,

> >>

> >> On 10/03/16 19:43, Laszlo Ersek wrote:

> >>> Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci

> >>> drivers"), several DRM drivers for platform devices used to expose an

> >>> explicit "drm_driver.set_busid" callback, invariably backed by

> >>> drm_platform_set_busid().

> >>>

> >>> Commit a325725633c2 removed drm_platform_set_busid(), along with the

> >>> referring .set_busid field initializations. This was justified because

> >>> interchangeable functionality had been implemented in drm_dev_alloc() /

> >>> drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.

> >>>

> >>> However, commit a325725633c2 also removed drm_virtio_set_busid(), for

> >>> which the same consolidation was not appropriate: this .set_busid callback

> >>> had been implemented with drm_pci_set_busid(), and not

> >>> drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's

> >>> "virtio-vga" card; the drmGetBusid() function from libdrm would no longer

> >>> return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable

> >>> platform ones like "virtio0".

> >>>

> >>> Reinstate drm_virtio_set_busid() with judicious use of

> >>>

> >>>   git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio

> >>>

> >>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

> >>> Cc: Daniel Vetter <daniel.vetter@intel.com>

> >>> Cc: David Airlie <airlied@redhat.com>

> >>> Cc: Emil Velikov <emil.l.velikov@gmail.com>

> >>> Cc: Gerd Hoffmann <kraxel@redhat.com>

> >>> Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

> >>> Cc: Hans de Goede <hdegoede@redhat.com>

> >>> Cc: Joachim Frieben <jfrieben@hotmail.com>

> >>> Cc: stable@vger.kernel.org

> >>> Reported-by: Joachim Frieben <jfrieben@hotmail.com>

> >>> Fixes: a325725633c26aa66ab940f762a6b0778edf76c0

> >>> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842

> >>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>

> >>> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

> >>> ---

> >>>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++

> >>>  drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +

> >>>  drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +

> >>>  3 files changed, 12 insertions(+)

> >>

> >> Is there any particular reason this patch hasn't been cherry-picked to

> >> linux-4.8.y? (I checked v4.8.2.)

> > 

> > Yes, it just showed up in 4.9-rc1 3 days ago, give me a chance to catch

> > up!  I have 210 patches right now that are in this same status,

> 

> My apologies; I didn't realize the volume.

> 

> (

> BTW I tried to fetch stable-queue this morning, and just now as well --

> for some reason that git command seems consistently stuck for me. It

> produces some low network traffic, but makes no progress:

> 

> > Looking up git.kernel.org ... done.

> > Connecting to git.kernel.org (port 9418) ... 199.204.44.194 done.

> > <stuck here>

> 

> Should I report this elsewhere and/or capture packets with tcpdump?


Can you clone any other git.kernel.org tree?

Works ok for me here...

thanks,

greg k-h
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Laszlo Ersek Oct. 18, 2016, 5:20 p.m. UTC | #5
On 10/18/16 18:57, Greg Kroah-Hartman wrote:
> On Tue, Oct 18, 2016 at 05:52:20PM +0200, Laszlo Ersek wrote:

>> On 10/18/16 08:38, Greg Kroah-Hartman wrote:

>>> On Mon, Oct 17, 2016 at 11:10:28PM +0200, Laszlo Ersek wrote:

>>>> Greg,

>>>>

>>>> On 10/03/16 19:43, Laszlo Ersek wrote:

>>>>> Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci

>>>>> drivers"), several DRM drivers for platform devices used to expose an

>>>>> explicit "drm_driver.set_busid" callback, invariably backed by

>>>>> drm_platform_set_busid().

>>>>>

>>>>> Commit a325725633c2 removed drm_platform_set_busid(), along with the

>>>>> referring .set_busid field initializations. This was justified because

>>>>> interchangeable functionality had been implemented in drm_dev_alloc() /

>>>>> drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.

>>>>>

>>>>> However, commit a325725633c2 also removed drm_virtio_set_busid(), for

>>>>> which the same consolidation was not appropriate: this .set_busid callback

>>>>> had been implemented with drm_pci_set_busid(), and not

>>>>> drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's

>>>>> "virtio-vga" card; the drmGetBusid() function from libdrm would no longer

>>>>> return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable

>>>>> platform ones like "virtio0".

>>>>>

>>>>> Reinstate drm_virtio_set_busid() with judicious use of

>>>>>

>>>>>   git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio

>>>>>

>>>>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

>>>>> Cc: Daniel Vetter <daniel.vetter@intel.com>

>>>>> Cc: David Airlie <airlied@redhat.com>

>>>>> Cc: Emil Velikov <emil.l.velikov@gmail.com>

>>>>> Cc: Gerd Hoffmann <kraxel@redhat.com>

>>>>> Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

>>>>> Cc: Hans de Goede <hdegoede@redhat.com>

>>>>> Cc: Joachim Frieben <jfrieben@hotmail.com>

>>>>> Cc: stable@vger.kernel.org

>>>>> Reported-by: Joachim Frieben <jfrieben@hotmail.com>

>>>>> Fixes: a325725633c26aa66ab940f762a6b0778edf76c0

>>>>> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842

>>>>> Signed-off-by: Laszlo Ersek <lersek@redhat.com>

>>>>> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

>>>>> ---

>>>>>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++

>>>>>  drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +

>>>>>  drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +

>>>>>  3 files changed, 12 insertions(+)

>>>>

>>>> Is there any particular reason this patch hasn't been cherry-picked to

>>>> linux-4.8.y? (I checked v4.8.2.)

>>>

>>> Yes, it just showed up in 4.9-rc1 3 days ago, give me a chance to catch

>>> up!  I have 210 patches right now that are in this same status,

>>

>> My apologies; I didn't realize the volume.

>>

>> (

>> BTW I tried to fetch stable-queue this morning, and just now as well --

>> for some reason that git command seems consistently stuck for me. It

>> produces some low network traffic, but makes no progress:

>>

>>> Looking up git.kernel.org ... done.

>>> Connecting to git.kernel.org (port 9418) ... 199.204.44.194 done.

>>> <stuck here>

>>

>> Should I report this elsewhere and/or capture packets with tcpdump?

> 

> Can you clone any other git.kernel.org tree?

> 

> Works ok for me here...


Ultimately it succeeded from here as well, but it took 24 minutes and 42
seconds. The actual transfer speed was acceptable (2.95 MiB/s) and the
transfer was short:

Looking up git.kernel.org ... done.
Connecting to git.kernel.org (port 9418) ... 198.145.20.140 done.
<looooong wait>
remote: Counting objects: 32528, done.
remote: Compressing objects: 100% (15835/15835), done.
remote: Total 32528 (delta 16858), reused 31765 (delta 16547)
Receiving objects: 100% (32528/32528), 17.21 MiB | 2.95 MiB/s, done.
Resolving deltas: 100% (16858/16858), done.
From git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue
   64bb1fafb84e..4e6b3d9223d7  master     -> stable-queue/master

I'm used to some navel gazing while the remote counts objects (also used
to brand new clones), but this time the delay occurred before that. It
could be related to my last pull from stable-queue (64bb1fafb84e) having
likely happened in April 2014... I guess "git fetch --verbose" could
have given me more info in that initial phase. (Using git version 2.9.2
at the moment.)

All the other remotes I regularly or occasionally pull from (Linus's,
kvm, stable, drm...) answer very quickly.

Sorry about the false alarm.

Thanks!
Laszlo
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diff mbox

Patch

diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
index 7f0e93f87a55..88a39165edd5 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -27,6 +27,16 @@ 
 
 #include "virtgpu_drv.h"
 
+int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master)
+{
+	struct pci_dev *pdev = dev->pdev;
+
+	if (pdev) {
+		return drm_pci_set_busid(dev, master);
+	}
+	return 0;
+}
+
 static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
 {
 	struct apertures_struct *ap;
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
index c13f70cfc461..5820b7020ae5 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -117,6 +117,7 @@  static const struct file_operations virtio_gpu_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_RENDER | DRIVER_ATOMIC,
+	.set_busid = drm_virtio_set_busid,
 	.load = virtio_gpu_driver_load,
 	.unload = virtio_gpu_driver_unload,
 	.open = virtio_gpu_driver_open,
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index b18ef3111f0c..acf556a35cb2 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -49,6 +49,7 @@ 
 #define DRIVER_PATCHLEVEL 1
 
 /* virtgpu_drm_bus.c */
+int drm_virtio_set_busid(struct drm_device *dev, struct drm_master *master);
 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev);
 
 struct virtio_gpu_object {