[Intel-gfx] [PATCH 3/4] drm: Only lastclose on unload for legacy drivers

[Daniel Vetter]

On Wed, Aug 2, 2017 at 10:50 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Wed, Aug 2, 2017 at 7:56 AM, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>> The only thing modern drivers are supposed to do in lastclose is
>> restore the fb emulation state. Which is entirely optional, and
>> there's really no reason to do that. So restrict it to legacy drivers
>> (where the driver cleanup essentially happens in lastclose).
>
> vga_switcheroo_process_delayed_switch() gets called in lastclose.
> Won't that need to get moved elsewhere for this to work?

Hm right, I forgot the lazy way to do runtime pm by keeping the device
alive as long as anyone has an open fd for it ... This shouldn't be a
problem, since you need to unregister from vgaswitcheroo anyway on
unload. Maybe that blows up, I'll check the code and augment the patch
as needed.
-Daniel

>
> Alex
>
>>
>> This will also allow us to share the unregister function with
>> drm_dev_unplug().
>>
>> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
>> ---
>>  drivers/gpu/drm/drm_drv.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
>> index 39191e5c240e..694040a240af 100644
>> --- a/drivers/gpu/drm/drm_drv.c
>> +++ b/drivers/gpu/drm/drm_drv.c
>> @@ -860,7 +860,8 @@ void drm_dev_unregister(struct drm_device *dev)
>>  {
>>         struct drm_map_list *r_list, *list_temp;
>>
>> -       drm_lastclose(dev);
>> +       if (drm_core_check_feature(dev, DRIVER_LEGACY))
>> +               drm_lastclose(dev);
>>
>>         dev->registered = false;
>>
>> --
>> 2.13.3
>>
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch