[PATCH 1/2] drm/xe/vf: Don't support changing GuC reset policy

[Laguna, Lukasz]

On 4/3/2025 12:56, Michal Wajdeczko wrote:
>
> On 03.04.2025 11:41, Lukasz Laguna wrote:
>> VF can't change GuC reset policy. Ensure the driver does not attempt to
>> do so by adding an assertion.
> none of xe_guc_ads() functions are applicable for the VFs by definition,
> since GuC ADS is purely a PF/native responsibility
>
> why do we want to assert just one of these function?
>
> it should either fail (due to use of the privileged H2G action) or crash
> (due to use of previously uninitialized structures)
>
> I'm not sure that we want to annotate/pollute all privileged parts of
> the driver with !IS_SRIOV_VF asserts

Makes sense. I'll drop this patch.

>
>> Signed-off-by: Lukasz Laguna <lukasz.laguna at intel.com>
>> ---
>>   drivers/gpu/drm/xe/xe_guc_ads.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/xe/xe_guc_ads.c b/drivers/gpu/drm/xe/xe_guc_ads.c
>> index bee4e0cfe7b8..2ea07d28728e 100644
>> --- a/drivers/gpu/drm/xe/xe_guc_ads.c
>> +++ b/drivers/gpu/drm/xe/xe_guc_ads.c
>> @@ -990,6 +990,8 @@ int xe_guc_ads_scheduler_policy_toggle_reset(struct xe_guc_ads *ads)
>>   	struct xe_bo *bo;
>>   	int ret = 0;
>>   
>> +	xe_gt_assert(gt, !IS_SRIOV_VF(gt_to_xe(gt)));
>> +
>>   	policies = kmalloc(sizeof(*policies), GFP_KERNEL);
>>   	if (!policies)
>>   		return -ENOMEM;