[Intel-gfx] [PATCH] Initialize the obj flags for shmem objects

[Iddamsetty, Aravind]

On 03-02-2023 17:42, Matthew Auld wrote:
> On 03/02/2023 11:57, Aravind Iddamsetty wrote:
>> Obj flags for shmem objects is not being set correctly.
>>
>> Cc: Matthew Auld <matthew.auld at intel.com>
>> Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at intel.com>
> 
> Subject should have "drm/i915:" prefix.
My bad missed that.
> 
> This is also a bug fix due to not setting BO_ALLOC_USER (the other flags
> don't seem to matter for shmem), which is quite important, so we need to
> figure out the "Fixes" tag. Maybe mention in the commit message that
> this fixes setting ALLOC_USER which is needed even for shmem.
> 
> Looking at the git history, ALLOC_USER looks to be first introduced in
> 213d50927763 ("drm/i915/ttm: Introduce a TTM i915 gem object backend"),
> but the users of ALLOC_USER at this stage are only interesting for the
> ttm backend, and that already passes the flags due to using its own
> object_init() vfunc for all normal object types.
> 
> So the first real user impacted by this bug appears to be in:
> 13d29c823738 ("drm/i915/ehl: unconditionally flush the pages on acquire").
> 
> So I think needs:
> 
> Fixes: 13d29c823738 ("drm/i915/ehl: unconditionally flush the pages on
> acquire")
> Cc: <stable at vger.kernel.org> # v5.15+
> 
> With that,
> Reviewed-by: Matthew Auld <matthew.auld at intel.com>
Thank you will resend the patch.

Regards,
Aravind.
> 
> 
>> ---
>>   drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
>> b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
>> index 114443096841..37d1efcd3ca6 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
>> @@ -596,7 +596,7 @@ static int shmem_object_init(struct
>> intel_memory_region *mem,
>>       mapping_set_gfp_mask(mapping, mask);
>>       GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
>>   -    i915_gem_object_init(obj, &i915_gem_shmem_ops, &lock_class, 0);
>> +    i915_gem_object_init(obj, &i915_gem_shmem_ops, &lock_class, flags);
>>       obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE;
>>       obj->write_domain = I915_GEM_DOMAIN_CPU;
>>       obj->read_domains = I915_GEM_DOMAIN_CPU;