Internal/volatile buffers should not be shmem backed.
If a volatile buffer is requested, allow ttm to use the pool allocator
to provide volatile pages as backing.
Fix i915_ttm_shrink to handle !is_shmem volatile buffers by purging.
Signed-off-by: Robert Beckett <bob.beckett@xxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 7 ++++---
1 file changed, 4 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 27d59639177f..8edce04a0509 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -309,7 +309,8 @@ static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
caching = i915_ttm_select_tt_caching(obj);
- if (i915_gem_object_is_shrinkable(obj) && caching == ttm_cached) {
+ if (i915_gem_object_is_shrinkable(obj) && caching == ttm_cached &&
+ !i915_gem_object_is_volatile(obj)) {
page_flags |= TTM_TT_FLAG_EXTERNAL |
TTM_TT_FLAG_EXTERNAL_MAPPABLE;
i915_tt->is_shmem = true;
@@ -531,9 +532,9 @@ static int i915_ttm_shrink(struct drm_i915_gem_object *obj, unsigned int flags)
if (!bo->ttm || bo->resource->mem_type != TTM_PL_SYSTEM)
return 0;
- GEM_BUG_ON(!i915_tt->is_shmem);
+ GEM_BUG_ON(!i915_tt->is_shmem && obj->mm.madv != I915_MADV_DONTNEED);
- if (!i915_tt->filp)
+ if (i915_tt->is_shmem && !i915_tt->filp)
return 0;
ret = ttm_bo_wait_ctx(bo, &ctx);
--
2.25.1
