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Subject[PATCH v4 6/8] drm/i915: allow volatile buffers to use ttm pool allocator
Date
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@collabora.com>
---
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 b6c3fc25d9d1..599ed2713359 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -291,7 +291,8 @@ 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;
@@ -513,9 +514,9 @@ 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
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