[PATCH 5/5] drm/i915/mtl: don't expose GSC command streamer to the user
Ceraolo Spurio, Daniele
daniele.ceraolospurio at intel.com
Fri Oct 28 17:14:05 UTC 2022
On 10/27/2022 8:40 PM, Matt Roper wrote:
> On Thu, Oct 27, 2022 at 03:15:54PM -0700, Daniele Ceraolo Spurio wrote:
>> There is no userspace user for this CS yet, we only need it for internal
>> kernel ops (e.g. HuC, PXP), so don't expose it.
>>
>> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
>> Cc: Matt Roper <matthew.d.roper at intel.com>
> Since we never expose it to userspace, we also never get to the point of
> doing an engine rename and removing the apostrophe. I assume we're okay
> with this engine continuing to show up as "other'6" in debug logs?
I don't think it matters a lot in debug logs, but anyway it wouldn't be
hard to rename it to something different. What do you suggest to rename
it to? Since OTHER_CLASS doesn't have a uabi_class defined we can't use
a count of engines of that type like we do for the other classes. Just
rename it straight to hardcoded gsc0 ?
Daniele
>
> Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
>
>> ---
>> drivers/gpu/drm/i915/gt/intel_engine_user.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
>> index 79312b734690..ca795daca116 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
>> +++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
>> @@ -211,6 +211,10 @@ void intel_engines_driver_register(struct drm_i915_private *i915)
>> if (intel_gt_has_unrecoverable_error(engine->gt))
>> continue; /* ignore incomplete engines */
>>
>> + /* don't expose GSC engine to user */
>> + if (engine->class == OTHER_CLASS)
>> + continue;
>> +
>> GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
>> engine->uabi_class = uabi_classes[engine->class];
>>
>> --
>> 2.37.3
>>
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