Re: [Intel-gfx] [PATCH] drm/i915: Depend on !PREEMPT_RT.

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

Hi,

On 25/02/2022 23:03, Sebastian Andrzej Siewior wrote:
> On 2022-02-14 19:59:08 [+0100], To intel-gfx@lists.freedesktop.org wrote:
>> There are a few sections in the driver which are not compatible with
>> PREEMPT_RT. They trigger warnings and can lead to deadlocks at runtime.
>>
>> Disable the i915 driver on a PREEMPT_RT enabled kernel. This way
>> PREEMPT_RT itself can be enabled without needing to address the i915
>> issues first. The RT related patches are still in RT queue and will be
>> handled later.
>>
>> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> 
> A gentle ping ;)

Could you paste a link to the queue of i915 patches pending for a quick 
overview of how much work there is and in what areas?

Also, I assume due absence of ARCH_SUPPORTS_RT being defined by any 
arch, that something more is not yet ready?

Regards,

Tvrtko

>> ---
>>   drivers/gpu/drm/i915/Kconfig | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
>> index a4c94dc2e2164..3aa719d5a0f0d 100644
>> --- a/drivers/gpu/drm/i915/Kconfig
>> +++ b/drivers/gpu/drm/i915/Kconfig
>> @@ -3,6 +3,7 @@ config DRM_I915
>>   	tristate "Intel 8xx/9xx/G3x/G4x/HD Graphics"
>>   	depends on DRM
>>   	depends on X86 && PCI
>> +	depends on !PREEMPT_RT
>>   	select INTEL_GTT
>>   	select INTERVAL_TREE
>>   	# we need shmfs for the swappable backing store, and in particular
> 
> Sebastian