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drm/i915: Check domains for userptr on release 

When we return pages to the system, we release control over them and
should defensively return them to the CPU write domain so that we catch
any external writes on reacquiring them (e.g. to transparently
swapout/swapin). While we did this defensive clflushing for ordinary
shmem pages, it was forgotten for userptr. Fortunately, userptr objects
are normally cache coherent and so oblivious to the forgotten domain
tracking.

References: a679f58d05 ("drm/i915: Flush pages on acquisition")
References: 754a254427 ("drm/i915: Skip object locking around a no-op set-domain ioctl")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190331094620.15185-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-03-31 10:46:20 +01:00
parent cde5f7edd5
commit ee8efa8079
3 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/i915_gem.c
View File

@ -308,7 +308,7 @@ static void __start_cpu_write(struct drm_i915_gem_object *obj)
obj->cache_dirty = true;
}
static void
void
__i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
struct sg_table *pages,
bool needs_clflush)
@ -2202,7 +2202,6 @@ i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
struct page *page;
__i915_gem_object_release_shmem(obj, pages, true);
i915_gem_gtt_finish_pages(obj, pages);
if (i915_gem_object_needs_bit17_swizzle(obj))

4
drivers/gpu/drm/i915/i915_gem_object.h
View File

@ -502,4 +502,8 @@ void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
unsigned int cache_level);
void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
struct sg_table *pages,
bool needs_clflush);
#endif

4
drivers/gpu/drm/i915/i915_gem_userptr.c
View File

@ -673,9 +673,7 @@ i915_gem_userptr_put_pages(struct drm_i915_gem_object *obj,
if (!pages)
return;
if (obj->mm.madv != I915_MADV_WILLNEED)
obj->mm.dirty = false;
__i915_gem_object_release_shmem(obj, pages, true);
i915_gem_gtt_finish_pages(obj, pages);
for_each_sgt_page(page, sgt_iter, pages) {