forked from Minki/linux
drm/selftests: add drm buddy alloc range testcase
- 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@amd.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Acked-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220222174845.2175-3-Arunpravin.PaneerSelvam@amd.com Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Arunpravin
Christian König
parent
cb8f00f27a
commit
92937f170d
@ -211,7 +211,7 @@ static int split_block(struct drm_buddy *mm,
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}
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static struct drm_buddy_block *
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get_buddy(struct drm_buddy_block *block)
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__get_buddy(struct drm_buddy_block *block)
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{
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struct drm_buddy_block *parent;
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@ -225,6 +225,23 @@ get_buddy(struct drm_buddy_block *block)
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return parent->left;
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}
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/**
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* drm_get_buddy - get buddy address
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*
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* @block: DRM buddy block
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*
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* Returns the corresponding buddy block for @block, or NULL
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* if this is a root block and can't be merged further.
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* Requires some kind of locking to protect against
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* any concurrent allocate and free operations.
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*/
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struct drm_buddy_block *
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drm_get_buddy(struct drm_buddy_block *block)
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{
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return __get_buddy(block);
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}
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EXPORT_SYMBOL(drm_get_buddy);
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static void __drm_buddy_free(struct drm_buddy *mm,
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struct drm_buddy_block *block)
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{
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@ -233,7 +250,7 @@ static void __drm_buddy_free(struct drm_buddy *mm,
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while ((parent = block->parent)) {
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struct drm_buddy_block *buddy;
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buddy = get_buddy(block);
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buddy = __get_buddy(block);
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if (!drm_buddy_block_is_free(buddy))
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break;
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@ -361,7 +378,7 @@ err_undo:
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* bigger is better, so make sure we merge everything back before we
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* free the allocated blocks.
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*/
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buddy = get_buddy(block);
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buddy = __get_buddy(block);
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if (buddy &&
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(drm_buddy_block_is_free(block) &&
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drm_buddy_block_is_free(buddy)))
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@ -500,7 +517,7 @@ err_undo:
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* bigger is better, so make sure we merge everything back before we
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* free the allocated blocks.
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*/
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buddy = get_buddy(block);
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buddy = __get_buddy(block);
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if (buddy &&
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(drm_buddy_block_is_free(block) &&
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drm_buddy_block_is_free(buddy)))
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@ -7,10 +7,11 @@
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#include "drm_random.h"
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static inline u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
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u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state)
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{
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return upper_32_bits((u64)prandom_u32_state(state) * ep_ro);
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}
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EXPORT_SYMBOL(drm_prandom_u32_max_state);
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void drm_random_reorder(unsigned int *order, unsigned int count,
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struct rnd_state *state)
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@ -22,5 +22,7 @@ unsigned int *drm_random_order(unsigned int count,
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void drm_random_reorder(unsigned int *order,
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unsigned int count,
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struct rnd_state *state);
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u32 drm_prandom_u32_max_state(u32 ep_ro,
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struct rnd_state *state);
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#endif /* !__DRM_RANDOM_H__ */
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@ -8,3 +8,4 @@
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*/
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selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */
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selftest(buddy_alloc_limit, igt_buddy_alloc_limit)
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selftest(buddy_alloc_range, igt_buddy_alloc_range)
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@ -6,6 +6,7 @@
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#define pr_fmt(fmt) "drm_buddy: " fmt
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#include <linux/module.h>
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#include <linux/prime_numbers.h>
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#include <drm/drm_buddy.h>
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@ -16,6 +17,393 @@
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static unsigned int random_seed;
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static inline const char *yesno(bool v)
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{
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return v ? "yes" : "no";
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}
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static void __igt_dump_block(struct drm_buddy *mm,
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struct drm_buddy_block *block,
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bool buddy)
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{
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pr_err("block info: header=%llx, state=%u, order=%d, offset=%llx size=%llx root=%s buddy=%s\n",
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block->header,
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drm_buddy_block_state(block),
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drm_buddy_block_order(block),
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drm_buddy_block_offset(block),
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drm_buddy_block_size(mm, block),
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yesno(!block->parent),
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yesno(buddy));
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}
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static void igt_dump_block(struct drm_buddy *mm,
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struct drm_buddy_block *block)
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{
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struct drm_buddy_block *buddy;
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__igt_dump_block(mm, block, false);
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buddy = drm_get_buddy(block);
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if (buddy)
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__igt_dump_block(mm, buddy, true);
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}
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static int igt_check_block(struct drm_buddy *mm,
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struct drm_buddy_block *block)
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{
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struct drm_buddy_block *buddy;
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unsigned int block_state;
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u64 block_size;
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u64 offset;
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int err = 0;
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block_state = drm_buddy_block_state(block);
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if (block_state != DRM_BUDDY_ALLOCATED &&
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block_state != DRM_BUDDY_FREE &&
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block_state != DRM_BUDDY_SPLIT) {
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pr_err("block state mismatch\n");
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err = -EINVAL;
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}
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block_size = drm_buddy_block_size(mm, block);
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offset = drm_buddy_block_offset(block);
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if (block_size < mm->chunk_size) {
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pr_err("block size smaller than min size\n");
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err = -EINVAL;
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}
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if (!is_power_of_2(block_size)) {
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pr_err("block size not power of two\n");
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err = -EINVAL;
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}
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if (!IS_ALIGNED(block_size, mm->chunk_size)) {
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pr_err("block size not aligned to min size\n");
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err = -EINVAL;
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}
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if (!IS_ALIGNED(offset, mm->chunk_size)) {
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pr_err("block offset not aligned to min size\n");
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err = -EINVAL;
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}
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if (!IS_ALIGNED(offset, block_size)) {
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pr_err("block offset not aligned to block size\n");
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err = -EINVAL;
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}
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buddy = drm_get_buddy(block);
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if (!buddy && block->parent) {
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pr_err("buddy has gone fishing\n");
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err = -EINVAL;
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}
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if (buddy) {
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if (drm_buddy_block_offset(buddy) != (offset ^ block_size)) {
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pr_err("buddy has wrong offset\n");
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err = -EINVAL;
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}
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if (drm_buddy_block_size(mm, buddy) != block_size) {
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pr_err("buddy size mismatch\n");
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err = -EINVAL;
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}
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if (drm_buddy_block_state(buddy) == block_state &&
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block_state == DRM_BUDDY_FREE) {
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pr_err("block and its buddy are free\n");
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err = -EINVAL;
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}
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}
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return err;
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}
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static int igt_check_blocks(struct drm_buddy *mm,
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struct list_head *blocks,
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u64 expected_size,
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bool is_contiguous)
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{
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struct drm_buddy_block *block;
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struct drm_buddy_block *prev;
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u64 total;
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int err = 0;
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block = NULL;
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prev = NULL;
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total = 0;
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list_for_each_entry(block, blocks, link) {
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err = igt_check_block(mm, block);
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if (!drm_buddy_block_is_allocated(block)) {
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pr_err("block not allocated\n"),
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err = -EINVAL;
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}
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if (is_contiguous && prev) {
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u64 prev_block_size;
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u64 prev_offset;
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u64 offset;
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prev_offset = drm_buddy_block_offset(prev);
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prev_block_size = drm_buddy_block_size(mm, prev);
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offset = drm_buddy_block_offset(block);
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if (offset != (prev_offset + prev_block_size)) {
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pr_err("block offset mismatch\n");
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err = -EINVAL;
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}
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}
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if (err)
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break;
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total += drm_buddy_block_size(mm, block);
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prev = block;
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}
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if (!err) {
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if (total != expected_size) {
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pr_err("size mismatch, expected=%llx, found=%llx\n",
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expected_size, total);
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err = -EINVAL;
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}
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return err;
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}
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if (prev) {
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pr_err("prev block, dump:\n");
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igt_dump_block(mm, prev);
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}
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pr_err("bad block, dump:\n");
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igt_dump_block(mm, block);
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return err;
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}
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static int igt_check_mm(struct drm_buddy *mm)
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{
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struct drm_buddy_block *root;
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struct drm_buddy_block *prev;
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unsigned int i;
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u64 total;
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int err = 0;
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if (!mm->n_roots) {
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pr_err("n_roots is zero\n");
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return -EINVAL;
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}
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if (mm->n_roots != hweight64(mm->size)) {
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pr_err("n_roots mismatch, n_roots=%u, expected=%lu\n",
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mm->n_roots, hweight64(mm->size));
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return -EINVAL;
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}
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root = NULL;
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prev = NULL;
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total = 0;
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for (i = 0; i < mm->n_roots; ++i) {
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struct drm_buddy_block *block;
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unsigned int order;
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root = mm->roots[i];
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if (!root) {
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pr_err("root(%u) is NULL\n", i);
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err = -EINVAL;
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break;
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}
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err = igt_check_block(mm, root);
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if (!drm_buddy_block_is_free(root)) {
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pr_err("root not free\n");
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err = -EINVAL;
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}
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order = drm_buddy_block_order(root);
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if (!i) {
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if (order != mm->max_order) {
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pr_err("max order root missing\n");
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err = -EINVAL;
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}
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}
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if (prev) {
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u64 prev_block_size;
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u64 prev_offset;
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u64 offset;
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prev_offset = drm_buddy_block_offset(prev);
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prev_block_size = drm_buddy_block_size(mm, prev);
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offset = drm_buddy_block_offset(root);
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if (offset != (prev_offset + prev_block_size)) {
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pr_err("root offset mismatch\n");
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err = -EINVAL;
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}
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}
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block = list_first_entry_or_null(&mm->free_list[order],
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struct drm_buddy_block,
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link);
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if (block != root) {
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pr_err("root mismatch at order=%u\n", order);
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err = -EINVAL;
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}
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if (err)
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break;
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prev = root;
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total += drm_buddy_block_size(mm, root);
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}
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if (!err) {
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if (total != mm->size) {
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pr_err("expected mm size=%llx, found=%llx\n", mm->size,
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total);
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err = -EINVAL;
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}
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return err;
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}
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if (prev) {
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pr_err("prev root(%u), dump:\n", i - 1);
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igt_dump_block(mm, prev);
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}
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if (root) {
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pr_err("bad root(%u), dump:\n", i);
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igt_dump_block(mm, root);
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}
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return err;
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}
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static void igt_mm_config(u64 *size, u64 *chunk_size)
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{
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DRM_RND_STATE(prng, random_seed);
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u32 s, ms;
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/* Nothing fancy, just try to get an interesting bit pattern */
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prandom_seed_state(&prng, random_seed);
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/* Let size be a random number of pages up to 8 GB (2M pages) */
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s = 1 + drm_prandom_u32_max_state((BIT(33 - 12)) - 1, &prng);
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/* Let the chunk size be a random power of 2 less than size */
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ms = BIT(drm_prandom_u32_max_state(ilog2(s), &prng));
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/* Round size down to the chunk size */
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s &= -ms;
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/* Convert from pages to bytes */
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*chunk_size = (u64)ms << 12;
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*size = (u64)s << 12;
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}
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static int igt_buddy_alloc_range(void *arg)
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{
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unsigned long flags = DRM_BUDDY_RANGE_ALLOCATION;
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u64 offset, size, rem, chunk_size, end;
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unsigned long page_num;
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struct drm_buddy mm;
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LIST_HEAD(blocks);
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int err;
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igt_mm_config(&size, &chunk_size);
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err = drm_buddy_init(&mm, size, chunk_size);
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if (err) {
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pr_err("buddy_init failed(%d)\n", err);
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return err;
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}
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err = igt_check_mm(&mm);
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if (err) {
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pr_err("pre-mm check failed, abort, abort, abort!\n");
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goto err_fini;
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}
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rem = mm.size;
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offset = 0;
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for_each_prime_number_from(page_num, 1, ULONG_MAX - 1) {
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struct drm_buddy_block *block;
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LIST_HEAD(tmp);
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size = min(page_num * mm.chunk_size, rem);
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end = offset + size;
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err = drm_buddy_alloc_blocks(&mm, offset, end, size, mm.chunk_size, &tmp, flags);
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if (err) {
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if (err == -ENOMEM) {
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pr_info("alloc_range hit -ENOMEM with size=%llx\n",
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size);
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} else {
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pr_err("alloc_range with offset=%llx, size=%llx failed(%d)\n",
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offset, size, err);
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}
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break;
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}
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block = list_first_entry_or_null(&tmp,
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struct drm_buddy_block,
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link);
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if (!block) {
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pr_err("alloc_range has no blocks\n");
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err = -EINVAL;
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break;
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}
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if (drm_buddy_block_offset(block) != offset) {
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pr_err("alloc_range start offset mismatch, found=%llx, expected=%llx\n",
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drm_buddy_block_offset(block), offset);
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err = -EINVAL;
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}
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if (!err)
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err = igt_check_blocks(&mm, &tmp, size, true);
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list_splice_tail(&tmp, &blocks);
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if (err)
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break;
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offset += size;
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rem -= size;
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if (!rem)
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break;
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cond_resched();
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}
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if (err == -ENOMEM)
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err = 0;
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drm_buddy_free_list(&mm, &blocks);
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if (!err) {
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err = igt_check_mm(&mm);
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if (err)
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pr_err("post-mm check failed\n");
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}
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err_fini:
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drm_buddy_fini(&mm);
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return err;
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}
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static int igt_buddy_alloc_limit(void *arg)
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{
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u64 end, size = U64_MAX, start = 0;
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@ -134,6 +134,9 @@ int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size);
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void drm_buddy_fini(struct drm_buddy *mm);
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struct drm_buddy_block *
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drm_get_buddy(struct drm_buddy_block *block);
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int drm_buddy_alloc_blocks(struct drm_buddy *mm,
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u64 start, u64 end, u64 size,
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u64 min_page_size,
|
||||
|
||||
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Reference in New Issue
Block a user