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drm/i915: Add mock exercise for i915_gem_gtt_insert 

i915_gem_gtt_insert should allocate from the available free space in the
GTT, evicting as necessary to create space.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-43-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-02-13 17:15:54 +00:00
parent e619cd0d22
commit 5f32616edb
1 changed files with 208 additions and 0 deletions
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208
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
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@ -1076,10 +1076,218 @@ static int igt_gtt_reserve(void *arg)
return err;
}
static int igt_gtt_insert(void *arg)
{
struct drm_i915_private *i915 = arg;
struct drm_i915_gem_object *obj, *on;
struct drm_mm_node tmp = {};
const struct invalid_insert {
u64 size;
u64 alignment;
u64 start, end;
} invalid_insert[] = {
{
i915->ggtt.base.total + I915_GTT_PAGE_SIZE, 0,
0, i915->ggtt.base.total,
},
{
2*I915_GTT_PAGE_SIZE, 0,
0, I915_GTT_PAGE_SIZE,
},
{
-(u64)I915_GTT_PAGE_SIZE, 0,
0, 4*I915_GTT_PAGE_SIZE,
},
{
-(u64)2*I915_GTT_PAGE_SIZE, 2*I915_GTT_PAGE_SIZE,
0, 4*I915_GTT_PAGE_SIZE,
},
{
I915_GTT_PAGE_SIZE, I915_GTT_MIN_ALIGNMENT << 1,
I915_GTT_MIN_ALIGNMENT, I915_GTT_MIN_ALIGNMENT << 1,
},
{}
}, *ii;
LIST_HEAD(objects);
u64 total;
int err;
/* i915_gem_gtt_insert() tries to allocate some free space in the GTT
* to the node, evicting if required.
*/
/* Check a couple of obviously invalid requests */
for (ii = invalid_insert; ii->size; ii++) {
err = i915_gem_gtt_insert(&i915->ggtt.base, &tmp,
ii->size, ii->alignment,
I915_COLOR_UNEVICTABLE,
ii->start, ii->end,
0);
if (err != -ENOSPC) {
pr_err("Invalid i915_gem_gtt_insert(.size=%llx, .alignment=%llx, .start=%llx, .end=%llx) succeeded (err=%d)\n",
ii->size, ii->alignment, ii->start, ii->end,
err);
return -EINVAL;
}
}
/* Start by filling the GGTT */
for (total = 0;
total + I915_GTT_PAGE_SIZE <= i915->ggtt.base.total;
total += I915_GTT_PAGE_SIZE) {
struct i915_vma *vma;
obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto out;
}
err = i915_gem_object_pin_pages(obj);
if (err) {
i915_gem_object_put(obj);
goto out;
}
list_add(&obj->st_link, &objects);
vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto out;
}
err = i915_gem_gtt_insert(&i915->ggtt.base, &vma->node,
obj->base.size, 0, obj->cache_level,
0, i915->ggtt.base.total,
0);
if (err == -ENOSPC) {
/* maxed out the GGTT space */
i915_gem_object_put(obj);
break;
}
if (err) {
pr_err("i915_gem_gtt_insert (pass 1) failed at %llu/%llu with err=%d\n",
total, i915->ggtt.base.total, err);
goto out;
}
track_vma_bind(vma);
__i915_vma_pin(vma);
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
}
list_for_each_entry(obj, &objects, st_link) {
struct i915_vma *vma;
vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto out;
}
if (!drm_mm_node_allocated(&vma->node)) {
pr_err("VMA was unexpectedly evicted!\n");
err = -EINVAL;
goto out;
}
__i915_vma_unpin(vma);
}
/* If we then reinsert, we should find the same hole */
list_for_each_entry_safe(obj, on, &objects, st_link) {
struct i915_vma *vma;
u64 offset;
vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto out;
}
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
offset = vma->node.start;
err = i915_vma_unbind(vma);
if (err) {
pr_err("i915_vma_unbind failed with err=%d!\n", err);
goto out;
}
err = i915_gem_gtt_insert(&i915->ggtt.base, &vma->node,
obj->base.size, 0, obj->cache_level,
0, i915->ggtt.base.total,
0);
if (err) {
pr_err("i915_gem_gtt_insert (pass 2) failed at %llu/%llu with err=%d\n",
total, i915->ggtt.base.total, err);
goto out;
}
track_vma_bind(vma);
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
if (vma->node.start != offset) {
pr_err("i915_gem_gtt_insert did not return node to its previous location (the only hole), expected address %llx, found %llx\n",
offset, vma->node.start);
err = -EINVAL;
goto out;
}
}
/* And then force evictions */
for (total = 0;
total + 2*I915_GTT_PAGE_SIZE <= i915->ggtt.base.total;
total += 2*I915_GTT_PAGE_SIZE) {
struct i915_vma *vma;
obj = i915_gem_object_create_internal(i915, 2*I915_GTT_PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto out;
}
err = i915_gem_object_pin_pages(obj);
if (err) {
i915_gem_object_put(obj);
goto out;
}
list_add(&obj->st_link, &objects);
vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto out;
}
err = i915_gem_gtt_insert(&i915->ggtt.base, &vma->node,
obj->base.size, 0, obj->cache_level,
0, i915->ggtt.base.total,
0);
if (err) {
pr_err("i915_gem_gtt_insert (pass 3) failed at %llu/%llu with err=%d\n",
total, i915->ggtt.base.total, err);
goto out;
}
track_vma_bind(vma);
GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
}
out:
list_for_each_entry_safe(obj, on, &objects, st_link) {
i915_gem_object_unpin_pages(obj);
i915_gem_object_put(obj);
}
return err;
}
int i915_gem_gtt_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
SUBTEST(igt_gtt_reserve),
SUBTEST(igt_gtt_insert),
};
struct drm_i915_private *i915;
int err;