[Intel-gfx] [PATCH 4/6] drm/i915/ttm: pass along the I915_BO_ALLOC_CONTIGUOUS

[Thomas Hellström]

Hi,

On Mon, 2021-06-07 at 19:22 +0100, Matthew Auld wrote:
> Currently we just ignore the I915_BO_ALLOC_CONTIGUOUS flag, which is
> fine since everything is already contiguous with the ttm range
> manager.
> However in the next patch we want to switch over to the ttm buddy
> manager, where allocations are by default not contiguous.
> 
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> index 73d52df8f2be..0b0fce445e9b 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
> @@ -86,10 +86,18 @@ i915_ttm_select_tt_caching(const struct
> drm_i915_gem_object *obj)
>  
>  static void
>  i915_ttm_place_from_region(const struct intel_memory_region *mr,
> -                          struct ttm_place *place)
> +                          struct ttm_place *place,
> +                          unsigned int flags)
>  {
>         memset(place, 0, sizeof(*place));
>         place->mem_type = intel_region_to_ttm_type(mr);
> +
> +       switch(mr->type) {
> +       case INTEL_MEMORY_LOCAL:
> +               if (flags & I915_BO_ALLOC_CONTIGUOUS)
> +                       place->flags = TTM_PL_FLAG_CONTIGUOUS;
> +               break;
> +       }

Do we need to restrict this to INTEL_MEMORY_LOCAL? While it doesn't
currently make much sense for other memory regions, no point in not
forwarding for all?

/Thomas