Some objects may need to be allocated as a continuous block, thinking
ahead the various kernel io_mapping interfaces seem to expect it.
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_object.h | 2 +
drivers/gpu/drm/i915/intel_memory_region.c | 7 +-
.../drm/i915/selftests/intel_memory_region.c | 152 +++++++++++++++++-
drivers/gpu/drm/i915/selftests/mock_region.c | 3 +
4 files changed, 158 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_object.h b/drivers/gpu/drm/i915/i915_gem_object.h
index 76947a6f49f1..efc23fc2b1df 100644
--- a/drivers/gpu/drm/i915/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/i915_gem_object.h
@@ -163,6 +163,8 @@ struct drm_i915_gem_object {
* activity?
*/
#define I915_BO_ACTIVE_REF 0
+#define I915_BO_ALLOC_CONTIGUOUS (1<<1)
+#define I915_BO_ALLOC_FLAGS (I915_BO_ALLOC_CONTIGUOUS)
/*
* Is the object to be mapped as read-only to the GPU
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index f7fdc3e942e6..ed37599c7784 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -59,6 +59,7 @@ i915_memory_region_get_pages_buddy(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mem = obj->memory_region;
resource_size_t size = obj->base.size;
+ unsigned int flags = obj->flags;
struct sg_table *st;
struct scatterlist *sg;
unsigned int sg_page_sizes;
@@ -99,7 +100,7 @@ i915_memory_region_get_pages_buddy(struct drm_i915_gem_object *obj)
if (!IS_ERR(block))
break;
- if (!order--) {
+ if (flags & I915_BO_ALLOC_CONTIGUOUS || !order--) {
resource_size_t target;
int err;
@@ -185,6 +186,9 @@ i915_gem_object_create_region(struct intel_memory_region *mem,
if (!mem)
return ERR_PTR(-ENODEV);
+ if (flags & ~I915_BO_ALLOC_FLAGS)
+ return ERR_PTR(-EINVAL);
+
size = round_up(size, mem->min_page_size);
GEM_BUG_ON(!size);
@@ -202,6 +206,7 @@ i915_gem_object_create_region(struct intel_memory_region *mem,
INIT_LIST_HEAD(&obj->blocks);
obj->memory_region = mem;
+ obj->flags = flags;
mutex_lock(&mem->obj_lock);
list_add(&obj->region_link, &mem->objects);
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 1cea381d2d5e..fbb1497d0f82 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -95,17 +95,17 @@ static int igt_mock_fill(void *arg)
static void igt_mark_evictable(struct drm_i915_gem_object *obj)
{
- i915_gem_object_unpin_pages(obj);
+ if (i915_gem_object_has_pinned_pages(obj))
+ i915_gem_object_unpin_pages(obj);
obj->mm.madv = I915_MADV_DONTNEED;
list_move(&obj->region_link, &obj->memory_region->purgeable);
}
-static int igt_mock_shrink(void *arg)
+static int igt_frag_region(struct intel_memory_region *mem,
+ struct list_head *objects)
{
- struct intel_memory_region *mem = arg;
struct drm_i915_gem_object *obj;
unsigned long n_objects;
- LIST_HEAD(objects);
resource_size_t target;
resource_size_t total;
int err = 0;
@@ -123,7 +123,7 @@ static int igt_mock_shrink(void *arg)
goto err_close_objects;
}
- list_add(&obj->st_link, &objects);
+ list_add(&obj->st_link, objects);
err = i915_gem_object_pin_pages(obj);
if (err)
@@ -137,6 +137,39 @@ static int igt_mock_shrink(void *arg)
igt_mark_evictable(obj);
}
+ return 0;
+
+err_close_objects:
+ close_objects(objects);
+ return err;
+}
+
+static void igt_defrag_region(struct list_head *objects)
+{
+ struct drm_i915_gem_object *obj;
+
+ list_for_each_entry(obj, objects, st_link) {
+ if (obj->mm.madv == I915_MADV_WILLNEED)
+ igt_mark_evictable(obj);
+ }
+}
+
+static int igt_mock_shrink(void *arg)
+{
+ struct intel_memory_region *mem = arg;
+ struct drm_i915_gem_object *obj;
+ LIST_HEAD(objects);
+ resource_size_t target;
+ resource_size_t total;
+ int err;
+
+ err = igt_frag_region(mem, &objects);
+ if (err)
+ return err;
+
+ total = resource_size(&mem->region);
+ target = mem->mm.min_size;
+
while (target <= total / 2) {
obj = i915_gem_object_create_region(mem, target, 0);
if (IS_ERR(obj)) {
@@ -168,11 +201,120 @@ static int igt_mock_shrink(void *arg)
return err;
}
+static int igt_mock_continuous(void *arg)
+{
+ struct intel_memory_region *mem = arg;
+ struct drm_i915_gem_object *obj;
+ LIST_HEAD(objects);
+ resource_size_t target;
+ resource_size_t total;
+ int err;
+
+ err = igt_frag_region(mem, &objects);
+ if (err)
+ return err;
+
+ total = resource_size(&mem->region);
+ target = total / 2;
+
+ /*
+ * Sanity check that we can allocate all of the available fragmented
+ * space.
+ */
+ obj = i915_gem_object_create_region(mem, target, 0);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto err_close_objects;
+ }
+
+ list_add(&obj->st_link, &objects);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err) {
+ pr_err("failed to allocate available space\n");
+ goto err_close_objects;
+ }
+
+ igt_mark_evictable(obj);
+
+ /* Try the smallest possible size -- should succeed */
+ obj = i915_gem_object_create_region(mem, mem->mm.min_size,
+ I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto err_close_objects;
+ }
+
+ list_add(&obj->st_link, &objects);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err) {
+ pr_err("failed to allocate smallest possible size\n");
+ goto err_close_objects;
+ }
+
+ igt_mark_evictable(obj);
+
+ if (obj->mm.pages->nents != 1) {
+ pr_err("[1]object spans multiple sg entries\n");
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ /*
+ * Even though there is enough free space for the allocation, we
+ * shouldn't be able to allocate it, given that it is fragmented, and
+ * non-continuous.
+ */
+ obj = i915_gem_object_create_region(mem, target, I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto err_close_objects;
+ }
+
+ list_add(&obj->st_link, &objects);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (!err) {
+ pr_err("expected allocation to fail\n");
+ err = -EINVAL;
+ goto err_close_objects;
+ }
+
+ igt_defrag_region(&objects);
+
+ /* Should now succeed */
+ obj = i915_gem_object_create_region(mem, target, I915_BO_ALLOC_CONTIGUOUS);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto err_close_objects;
+ }
+
+ list_add(&obj->st_link, &objects);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err) {
+ pr_err("failed to allocate from defraged area\n");
+ goto err_close_objects;
+ }
+
+ if (obj->mm.pages->nents != 1) {
+ pr_err("object spans multiple sg entries\n");
+ err = -EINVAL;
+ }
+
+err_close_objects:
+ close_objects(&objects);
+
+ return err;
+}
+
int intel_memory_region_mock_selftests(void)
{
static const struct i915_subtest tests[] = {
SUBTEST(igt_mock_fill),
SUBTEST(igt_mock_shrink),
+ SUBTEST(igt_mock_continuous),
};
struct intel_memory_region *mem;
struct drm_i915_private *i915;
diff --git a/drivers/gpu/drm/i915/selftests/mock_region.c b/drivers/gpu/drm/i915/selftests/mock_region.c
index 11e9f379aaca..c1c09d0e4722 100644
--- a/drivers/gpu/drm/i915/selftests/mock_region.c
+++ b/drivers/gpu/drm/i915/selftests/mock_region.c
@@ -38,6 +38,9 @@ mock_object_create(struct intel_memory_region *mem,
struct drm_i915_private *i915 = mem->i915;
struct drm_i915_gem_object *obj;
+ if (flags & I915_BO_ALLOC_CONTIGUOUS)
+ size = roundup_pow_of_two(size);
+
if (size > BIT(mem->mm.max_order) * mem->mm.min_size)
return ERR_PTR(-E2BIG);
--
2.20.1
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