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drm/i915/selftests: exercise cache domain eviction 

Add a selftest to exercise evicting neighbouring nodes that conflict due
to page colouring in the GTT.

v2: add a peppering of comments

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170306235414.23407-4-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Matthew Auld 2017-03-06 23:54:02 +00:00 committed by Chris Wilson
parent fe65cbdbc9
commit fceb43033d
1 changed files with 90 additions and 0 deletions
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90
drivers/gpu/drm/i915/selftests/i915_gem_evict.c
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@ -202,6 +202,95 @@ cleanup:
return err;
}
static void mock_color_adjust(const struct drm_mm_node *node,
unsigned long color,
u64 *start,
u64 *end)
{
}
static int igt_evict_for_cache_color(void *arg)
{
struct drm_i915_private *i915 = arg;
struct i915_ggtt *ggtt = &i915->ggtt;
const unsigned long flags = PIN_OFFSET_FIXED;
struct drm_mm_node target = {
.start = I915_GTT_PAGE_SIZE * 2,
.size = I915_GTT_PAGE_SIZE,
.color = I915_CACHE_LLC,
};
struct drm_i915_gem_object *obj;
struct i915_vma *vma;
int err;
/* Currently the use of color_adjust is limited to cache domains within
* the ggtt, and so the presence of mm.color_adjust is assumed to be
* i915_gtt_color_adjust throughout our driver, so using a mock color
* adjust will work just fine for our purposes.
*/
ggtt->base.mm.color_adjust = mock_color_adjust;
obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto cleanup;
}
i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
I915_GTT_PAGE_SIZE | flags);
if (IS_ERR(vma)) {
pr_err("[0]i915_gem_object_ggtt_pin failed\n");
err = PTR_ERR(vma);
goto cleanup;
}
obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto cleanup;
}
i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
/* Neighbouring; same colour - should fit */
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
(I915_GTT_PAGE_SIZE * 2) | flags);
if (IS_ERR(vma)) {
pr_err("[1]i915_gem_object_ggtt_pin failed\n");
err = PTR_ERR(vma);
goto cleanup;
}
i915_vma_unpin(vma);
/* Remove just the second vma */
err = i915_gem_evict_for_node(&ggtt->base, &target, 0);
if (err) {
pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
goto cleanup;
}
/* Attempt to remove the first *pinned* vma, by removing the (empty)
* neighbour -- this should fail.
*/
target.color = I915_CACHE_L3_LLC;
err = i915_gem_evict_for_node(&ggtt->base, &target, 0);
if (!err) {
pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
err = -EINVAL;
goto cleanup;
}
err = 0;
cleanup:
unpin_ggtt(i915);
cleanup_objects(i915);
ggtt->base.mm.color_adjust = NULL;
return err;
}
static int igt_evict_vm(void *arg)
{
struct drm_i915_private *i915 = arg;
@ -241,6 +330,7 @@ int i915_gem_evict_mock_selftests(void)
static const struct i915_subtest tests[] = {
SUBTEST(igt_evict_something),
SUBTEST(igt_evict_for_vma),
SUBTEST(igt_evict_for_cache_color),
SUBTEST(igt_evict_vm),
SUBTEST(igt_overcommit),
};