[PATCH v2 3/7] drm/selftests: add drm buddy alloc range testcase
Arunpravin
Arunpravin.PaneerSelvam at amd.com
Tue Feb 22 17:48:41 UTC 2022
- add a test to check the range allocation
- export get_buddy() function in drm_buddy.c
- export drm_prandom_u32_max_state() in lib/drm_random.c
- include helper functions
- include prime number header file
v2:
- add drm_get_buddy() function description (Matthew Auld)
- removed unnecessary test succeeded print
Signed-off-by: Arunpravin <Arunpravin.PaneerSelvam at amd.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>
Acked-by: Christian König <christian.koenig at amd.com>
---
drivers/gpu/drm/drm_buddy.c | 25 +-
drivers/gpu/drm/lib/drm_random.c | 3 +-
drivers/gpu/drm/lib/drm_random.h | 2 +
.../gpu/drm/selftests/drm_buddy_selftests.h | 1 +
drivers/gpu/drm/selftests/test-drm_buddy.c | 388 ++++++++++++++++++
include/drm/drm_buddy.h | 3 +
6 files changed, 417 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/drm_buddy.c b/drivers/gpu/drm/drm_buddy.c
index edef30be8304..72f52f293249 100644
--- a/drivers/gpu/drm/drm_buddy.c
+++ b/drivers/gpu/drm/drm_buddy.c
@@ -211,7 +211,7 @@ static int split_block(struct drm_buddy *mm,
}
static struct drm_buddy_block *
-get_buddy(struct drm_buddy_block *block)
+__get_buddy(struct drm_buddy_block *block)
{
struct drm_buddy_block *parent;
@@ -225,6 +225,23 @@ get_buddy(struct drm_buddy_block *block)
return parent->left;
}
+/**
+ * drm_get_buddy - get buddy address
+ *
+ * @block: DRM buddy block
+ *
+ * Returns the corresponding buddy block for @block, or NULL
+ * if this is a root block and can't be merged further.
+ * Requires some kind of locking to protect against
+ * any concurrent allocate and free operations.
+ */
+struct drm_buddy_block *
+drm_get_buddy(struct drm_buddy_block *block)
+{
+ return __get_buddy(block);
+}
+EXPORT_SYMBOL(drm_get_buddy);
+
static void __drm_buddy_free(struct drm_buddy *mm,
struct drm_buddy_block *block)
{
@@ -233,7 +250,7 @@ static void __drm_buddy_free(struct drm_buddy *mm,
while ((parent = block->parent)) {
struct drm_buddy_block *buddy;
- buddy = get_buddy(block);
+ buddy = __get_buddy(block);
if (!drm_buddy_block_is_free(buddy))
break;
@@ -361,7 +378,7 @@ alloc_range_bias(struct drm_buddy *mm,
* bigger is better, so make sure we merge everything back before we
* free the allocated blocks.
*/
- buddy = get_buddy(block);
+ buddy = __get_buddy(block);
if (buddy &&
(drm_buddy_block_is_free(block) &&
drm_buddy_block_is_free(buddy)))
@@ -500,7 +517,7 @@ static int __alloc_range(struct drm_buddy *mm,
* bigger is better, so make sure we merge everything back before we
* free the allocated blocks.
*/
- buddy = get_buddy(block);
+ buddy = __get_buddy(block);
if (buddy &&
(drm_buddy_block_is_free(block) &&
drm_buddy_block_is_free(buddy)))
diff --git a/drivers/gpu/drm/lib/drm_random.c b/drivers/gpu/drm/lib/drm_random.c
index eeb155826d27..31b5a3e21911 100644
--- a/drivers/gpu/drm/lib/drm_random.c
+++ b/drivers/gpu/drm/lib/drm_random.c
@@ -7,10 +7,11 @@
#include "drm_random.h"
-static inline u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
+u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
{
return upper_32_bits((u64)prandom_u32_state(state) * ep_ro);
}
+EXPORT_SYMBOL(drm_prandom_u32_max_state);
void drm_random_reorder(unsigned int *order, unsigned int count,
struct rnd_state *state)
diff --git a/drivers/gpu/drm/lib/drm_random.h b/drivers/gpu/drm/lib/drm_random.h
index 4a3e94dfa0c0..5543bf0474bc 100644
--- a/drivers/gpu/drm/lib/drm_random.h
+++ b/drivers/gpu/drm/lib/drm_random.h
@@ -22,5 +22,7 @@ unsigned int *drm_random_order(unsigned int count,
void drm_random_reorder(unsigned int *order,
unsigned int count,
struct rnd_state *state);
+u32 drm_prandom_u32_max_state(u32 ep_ro,
+ struct rnd_state *state);
#endif /* !__DRM_RANDOM_H__ */
diff --git a/drivers/gpu/drm/selftests/drm_buddy_selftests.h b/drivers/gpu/drm/selftests/drm_buddy_selftests.h
index ebe16162762f..3230bfd2770b 100644
--- a/drivers/gpu/drm/selftests/drm_buddy_selftests.h
+++ b/drivers/gpu/drm/selftests/drm_buddy_selftests.h
@@ -8,3 +8,4 @@
*/
selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */
selftest(buddy_alloc_limit, igt_buddy_alloc_limit)
+selftest(buddy_alloc_range, igt_buddy_alloc_range)
diff --git a/drivers/gpu/drm/selftests/test-drm_buddy.c b/drivers/gpu/drm/selftests/test-drm_buddy.c
index 0df41e1cb8a6..586e0673a67c 100644
--- a/drivers/gpu/drm/selftests/test-drm_buddy.c
+++ b/drivers/gpu/drm/selftests/test-drm_buddy.c
@@ -6,6 +6,7 @@
#define pr_fmt(fmt) "drm_buddy: " fmt
#include <linux/module.h>
+#include <linux/prime_numbers.h>
#include <drm/drm_buddy.h>
@@ -16,6 +17,393 @@
static unsigned int random_seed;
+static inline const char *yesno(bool v)
+{
+ return v ? "yes" : "no";
+}
+
+static void __igt_dump_block(struct drm_buddy *mm,
+ struct drm_buddy_block *block,
+ bool buddy)
+{
+ pr_err("block info: header=%llx, state=%u, order=%d, offset=%llx size=%llx root=%s buddy=%s\n",
+ block->header,
+ drm_buddy_block_state(block),
+ drm_buddy_block_order(block),
+ drm_buddy_block_offset(block),
+ drm_buddy_block_size(mm, block),
+ yesno(!block->parent),
+ yesno(buddy));
+}
+
+static void igt_dump_block(struct drm_buddy *mm,
+ struct drm_buddy_block *block)
+{
+ struct drm_buddy_block *buddy;
+
+ __igt_dump_block(mm, block, false);
+
+ buddy = drm_get_buddy(block);
+ if (buddy)
+ __igt_dump_block(mm, buddy, true);
+}
+
+static int igt_check_block(struct drm_buddy *mm,
+ struct drm_buddy_block *block)
+{
+ struct drm_buddy_block *buddy;
+ unsigned int block_state;
+ u64 block_size;
+ u64 offset;
+ int err = 0;
+
+ block_state = drm_buddy_block_state(block);
+
+ if (block_state != DRM_BUDDY_ALLOCATED &&
+ block_state != DRM_BUDDY_FREE &&
+ block_state != DRM_BUDDY_SPLIT) {
+ pr_err("block state mismatch\n");
+ err = -EINVAL;
+ }
+
+ block_size = drm_buddy_block_size(mm, block);
+ offset = drm_buddy_block_offset(block);
+
+ if (block_size < mm->chunk_size) {
+ pr_err("block size smaller than min size\n");
+ err = -EINVAL;
+ }
+
+ if (!is_power_of_2(block_size)) {
+ pr_err("block size not power of two\n");
+ err = -EINVAL;
+ }
+
+ if (!IS_ALIGNED(block_size, mm->chunk_size)) {
+ pr_err("block size not aligned to min size\n");
+ err = -EINVAL;
+ }
+
+ if (!IS_ALIGNED(offset, mm->chunk_size)) {
+ pr_err("block offset not aligned to min size\n");
+ err = -EINVAL;
+ }
+
+ if (!IS_ALIGNED(offset, block_size)) {
+ pr_err("block offset not aligned to block size\n");
+ err = -EINVAL;
+ }
+
+ buddy = drm_get_buddy(block);
+
+ if (!buddy && block->parent) {
+ pr_err("buddy has gone fishing\n");
+ err = -EINVAL;
+ }
+
+ if (buddy) {
+ if (drm_buddy_block_offset(buddy) != (offset ^ block_size)) {
+ pr_err("buddy has wrong offset\n");
+ err = -EINVAL;
+ }
+
+ if (drm_buddy_block_size(mm, buddy) != block_size) {
+ pr_err("buddy size mismatch\n");
+ err = -EINVAL;
+ }
+
+ if (drm_buddy_block_state(buddy) == block_state &&
+ block_state == DRM_BUDDY_FREE) {
+ pr_err("block and its buddy are free\n");
+ err = -EINVAL;
+ }
+ }
+
+ return err;
+}
+
+static int igt_check_blocks(struct drm_buddy *mm,
+ struct list_head *blocks,
+ u64 expected_size,
+ bool is_contiguous)
+{
+ struct drm_buddy_block *block;
+ struct drm_buddy_block *prev;
+ u64 total;
+ int err = 0;
+
+ block = NULL;
+ prev = NULL;
+ total = 0;
+
+ list_for_each_entry(block, blocks, link) {
+ err = igt_check_block(mm, block);
+
+ if (!drm_buddy_block_is_allocated(block)) {
+ pr_err("block not allocated\n"),
+ err = -EINVAL;
+ }
+
+ if (is_contiguous && prev) {
+ u64 prev_block_size;
+ u64 prev_offset;
+ u64 offset;
+
+ prev_offset = drm_buddy_block_offset(prev);
+ prev_block_size = drm_buddy_block_size(mm, prev);
+ offset = drm_buddy_block_offset(block);
+
+ if (offset != (prev_offset + prev_block_size)) {
+ pr_err("block offset mismatch\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (err)
+ break;
+
+ total += drm_buddy_block_size(mm, block);
+ prev = block;
+ }
+
+ if (!err) {
+ if (total != expected_size) {
+ pr_err("size mismatch, expected=%llx, found=%llx\n",
+ expected_size, total);
+ err = -EINVAL;
+ }
+ return err;
+ }
+
+ if (prev) {
+ pr_err("prev block, dump:\n");
+ igt_dump_block(mm, prev);
+ }
+
+ pr_err("bad block, dump:\n");
+ igt_dump_block(mm, block);
+
+ return err;
+}
+
+static int igt_check_mm(struct drm_buddy *mm)
+{
+ struct drm_buddy_block *root;
+ struct drm_buddy_block *prev;
+ unsigned int i;
+ u64 total;
+ int err = 0;
+
+ if (!mm->n_roots) {
+ pr_err("n_roots is zero\n");
+ return -EINVAL;
+ }
+
+ if (mm->n_roots != hweight64(mm->size)) {
+ pr_err("n_roots mismatch, n_roots=%u, expected=%lu\n",
+ mm->n_roots, hweight64(mm->size));
+ return -EINVAL;
+ }
+
+ root = NULL;
+ prev = NULL;
+ total = 0;
+
+ for (i = 0; i < mm->n_roots; ++i) {
+ struct drm_buddy_block *block;
+ unsigned int order;
+
+ root = mm->roots[i];
+ if (!root) {
+ pr_err("root(%u) is NULL\n", i);
+ err = -EINVAL;
+ break;
+ }
+
+ err = igt_check_block(mm, root);
+
+ if (!drm_buddy_block_is_free(root)) {
+ pr_err("root not free\n");
+ err = -EINVAL;
+ }
+
+ order = drm_buddy_block_order(root);
+
+ if (!i) {
+ if (order != mm->max_order) {
+ pr_err("max order root missing\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (prev) {
+ u64 prev_block_size;
+ u64 prev_offset;
+ u64 offset;
+
+ prev_offset = drm_buddy_block_offset(prev);
+ prev_block_size = drm_buddy_block_size(mm, prev);
+ offset = drm_buddy_block_offset(root);
+
+ if (offset != (prev_offset + prev_block_size)) {
+ pr_err("root offset mismatch\n");
+ err = -EINVAL;
+ }
+ }
+
+ block = list_first_entry_or_null(&mm->free_list[order],
+ struct drm_buddy_block,
+ link);
+ if (block != root) {
+ pr_err("root mismatch at order=%u\n", order);
+ err = -EINVAL;
+ }
+
+ if (err)
+ break;
+
+ prev = root;
+ total += drm_buddy_block_size(mm, root);
+ }
+
+ if (!err) {
+ if (total != mm->size) {
+ pr_err("expected mm size=%llx, found=%llx\n", mm->size,
+ total);
+ err = -EINVAL;
+ }
+ return err;
+ }
+
+ if (prev) {
+ pr_err("prev root(%u), dump:\n", i - 1);
+ igt_dump_block(mm, prev);
+ }
+
+ if (root) {
+ pr_err("bad root(%u), dump:\n", i);
+ igt_dump_block(mm, root);
+ }
+
+ return err;
+}
+
+static void igt_mm_config(u64 *size, u64 *chunk_size)
+{
+ DRM_RND_STATE(prng, random_seed);
+ u32 s, ms;
+
+ /* Nothing fancy, just try to get an interesting bit pattern */
+
+ prandom_seed_state(&prng, random_seed);
+
+ /* Let size be a random number of pages up to 8 GB (2M pages) */
+ s = 1 + drm_prandom_u32_max_state((BIT(33 - 12)) - 1, &prng);
+ /* Let the chunk size be a random power of 2 less than size */
+ ms = BIT(drm_prandom_u32_max_state(ilog2(s), &prng));
+ /* Round size down to the chunk size */
+ s &= -ms;
+
+ /* Convert from pages to bytes */
+ *chunk_size = (u64)ms << 12;
+ *size = (u64)s << 12;
+}
+
+static int igt_buddy_alloc_range(void *arg)
+{
+ unsigned long flags = DRM_BUDDY_RANGE_ALLOCATION;
+ u64 offset, size, rem, chunk_size, end;
+ unsigned long page_num;
+ struct drm_buddy mm;
+ LIST_HEAD(blocks);
+ int err;
+
+ igt_mm_config(&size, &chunk_size);
+
+ err = drm_buddy_init(&mm, size, chunk_size);
+ if (err) {
+ pr_err("buddy_init failed(%d)\n", err);
+ return err;
+ }
+
+ err = igt_check_mm(&mm);
+ if (err) {
+ pr_err("pre-mm check failed, abort, abort, abort!\n");
+ goto err_fini;
+ }
+
+ rem = mm.size;
+ offset = 0;
+
+ for_each_prime_number_from(page_num, 1, ULONG_MAX - 1) {
+ struct drm_buddy_block *block;
+ LIST_HEAD(tmp);
+
+ size = min(page_num * mm.chunk_size, rem);
+ end = offset + size;
+
+ err = drm_buddy_alloc_blocks(&mm, offset, end, size, mm.chunk_size, &tmp, flags);
+ if (err) {
+ if (err == -ENOMEM) {
+ pr_info("alloc_range hit -ENOMEM with size=%llx\n",
+ size);
+ } else {
+ pr_err("alloc_range with offset=%llx, size=%llx failed(%d)\n",
+ offset, size, err);
+ }
+
+ break;
+ }
+
+ block = list_first_entry_or_null(&tmp,
+ struct drm_buddy_block,
+ link);
+ if (!block) {
+ pr_err("alloc_range has no blocks\n");
+ err = -EINVAL;
+ break;
+ }
+
+ if (drm_buddy_block_offset(block) != offset) {
+ pr_err("alloc_range start offset mismatch, found=%llx, expected=%llx\n",
+ drm_buddy_block_offset(block), offset);
+ err = -EINVAL;
+ }
+
+ if (!err)
+ err = igt_check_blocks(&mm, &tmp, size, true);
+
+ list_splice_tail(&tmp, &blocks);
+
+ if (err)
+ break;
+
+ offset += size;
+
+ rem -= size;
+ if (!rem)
+ break;
+
+ cond_resched();
+ }
+
+ if (err == -ENOMEM)
+ err = 0;
+
+ drm_buddy_free_list(&mm, &blocks);
+
+ if (!err) {
+ err = igt_check_mm(&mm);
+ if (err)
+ pr_err("post-mm check failed\n");
+ }
+
+err_fini:
+ drm_buddy_fini(&mm);
+
+ return err;
+}
+
static int igt_buddy_alloc_limit(void *arg)
{
u64 end, size = U64_MAX, start = 0;
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h
index bd21f9dfd15e..572077ff8ae7 100644
--- a/include/drm/drm_buddy.h
+++ b/include/drm/drm_buddy.h
@@ -134,6 +134,9 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size);
void drm_buddy_fini(struct drm_buddy *mm);
+struct drm_buddy_block *
+drm_get_buddy(struct drm_buddy_block *block);
+
int drm_buddy_alloc_blocks(struct drm_buddy *mm,
u64 start, u64 end, u64 size,
u64 min_page_size,
--
2.25.1
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