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Subject[PATCH v3 8/9] drm: selftest: convert drm_buddy selftest to KUnit
Date
Considering the current adoption of the KUnit framework, convert the
DRM buddy selftest to the KUnit API.

Acked-by: Daniel Latypov <dlatypov@google.com>
Tested-by: David Gow <davidgow@google.com>
Signed-off-by: Maíra Canal <maira.canal@usp.br>
---
drivers/gpu/drm/selftests/Makefile | 2 +-
.../gpu/drm/selftests/drm_buddy_selftests.h | 15 -
drivers/gpu/drm/selftests/test-drm_buddy.c | 994 ------------------
drivers/gpu/drm/tests/Makefile | 2 +-
drivers/gpu/drm/tests/drm_buddy_test.c | 748 +++++++++++++
5 files changed, 750 insertions(+), 1011 deletions(-)
delete mode 100644 drivers/gpu/drm/selftests/drm_buddy_selftests.h
delete mode 100644 drivers/gpu/drm/selftests/test-drm_buddy.c
create mode 100644 drivers/gpu/drm/tests/drm_buddy_test.c

diff --git a/drivers/gpu/drm/selftests/Makefile b/drivers/gpu/drm/selftests/Makefile
index f7db628b60cb..a4ebecb8146b 100644
--- a/drivers/gpu/drm/selftests/Makefile
+++ b/drivers/gpu/drm/selftests/Makefile
@@ -1,2 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_DRM_DEBUG_SELFTEST) += test-drm_mm.o test-drm_buddy.o
+obj-$(CONFIG_DRM_DEBUG_SELFTEST) += test-drm_mm.o
diff --git a/drivers/gpu/drm/selftests/drm_buddy_selftests.h b/drivers/gpu/drm/selftests/drm_buddy_selftests.h
deleted file mode 100644
index 455b756c4ae5..000000000000
--- a/drivers/gpu/drm/selftests/drm_buddy_selftests.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* List each unit test as selftest(name, function)
- *
- * The name is used as both an enum and expanded as igt__name to create
- * a module parameter. It must be unique and legal for a C identifier.
- *
- * Tests are executed in order by igt/drm_buddy
- */
-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)
-selftest(buddy_alloc_optimistic, igt_buddy_alloc_optimistic)
-selftest(buddy_alloc_pessimistic, igt_buddy_alloc_pessimistic)
-selftest(buddy_alloc_smoke, igt_buddy_alloc_smoke)
-selftest(buddy_alloc_pathological, igt_buddy_alloc_pathological)
diff --git a/drivers/gpu/drm/selftests/test-drm_buddy.c b/drivers/gpu/drm/selftests/test-drm_buddy.c
deleted file mode 100644
index aca0c491040f..000000000000
--- a/drivers/gpu/drm/selftests/test-drm_buddy.c
+++ /dev/null
@@ -1,994 +0,0 @@
-// SPDX-License-Identifier: MIT
-/*
- * Copyright © 2019 Intel Corporation
- */
-
-#define pr_fmt(fmt) "drm_buddy: " fmt
-
-#include <linux/module.h>
-#include <linux/prime_numbers.h>
-#include <linux/sched/signal.h>
-
-#include <drm/drm_buddy.h>
-
-#include "../lib/drm_random.h"
-
-#define TESTS "drm_buddy_selftests.h"
-#include "drm_selftest.h"
-
-#define IGT_TIMEOUT(name__) \
- unsigned long name__ = jiffies + MAX_SCHEDULE_TIMEOUT
-
-static unsigned int random_seed;
-
-static inline u64 get_size(int order, u64 chunk_size)
-{
- return (1 << order) * chunk_size;
-}
-
-__printf(2, 3)
-static bool __igt_timeout(unsigned long timeout, const char *fmt, ...)
-{
- va_list va;
-
- if (!signal_pending(current)) {
- cond_resched();
- if (time_before(jiffies, timeout))
- return false;
- }
-
- if (fmt) {
- va_start(va, fmt);
- vprintk(fmt, va);
- va_end(va);
- }
-
- return true;
-}
-
-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_pathological(void *arg)
-{
- u64 mm_size, size, min_page_size, start = 0;
- struct drm_buddy_block *block;
- const int max_order = 3;
- unsigned long flags = 0;
- int order, top, err;
- struct drm_buddy mm;
- LIST_HEAD(blocks);
- LIST_HEAD(holes);
- LIST_HEAD(tmp);
-
- /*
- * Create a pot-sized mm, then allocate one of each possible
- * order within. This should leave the mm with exactly one
- * page left. Free the largest block, then whittle down again.
- * Eventually we will have a fully 50% fragmented mm.
- */
-
- mm_size = PAGE_SIZE << max_order;
- err = drm_buddy_init(&mm, mm_size, PAGE_SIZE);
- if (err) {
- pr_err("buddy_init failed(%d)\n", err);
- return err;
- }
- BUG_ON(mm.max_order != max_order);
-
- for (top = max_order; top; top--) {
- /* Make room by freeing the largest allocated block */
- block = list_first_entry_or_null(&blocks, typeof(*block), link);
- if (block) {
- list_del(&block->link);
- drm_buddy_free_block(&mm, block);
- }
-
- for (order = top; order--; ) {
- size = min_page_size = get_size(order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size,
- min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc hit -ENOMEM with order=%d, top=%d\n",
- order, top);
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- }
-
- /* There should be one final page for this sub-allocation */
- size = min_page_size = get_size(0, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc hit -ENOMEM for hole\n");
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &holes);
-
- size = min_page_size = get_size(top, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (!err) {
- pr_info("buddy_alloc unexpectedly succeeded at top-order %d/%d, it should be full!",
- top, max_order);
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- err = -EINVAL;
- goto err;
- }
- }
-
- drm_buddy_free_list(&mm, &holes);
-
- /* Nothing larger than blocks of chunk_size now available */
- for (order = 1; order <= max_order; order++) {
- size = min_page_size = get_size(order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (!err) {
- pr_info("buddy_alloc unexpectedly succeeded at order %d, it should be full!",
- order);
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- err = -EINVAL;
- goto err;
- }
- }
-
- if (err)
- err = 0;
-
-err:
- list_splice_tail(&holes, &blocks);
- drm_buddy_free_list(&mm, &blocks);
- drm_buddy_fini(&mm);
- return err;
-}
-
-static int igt_buddy_alloc_smoke(void *arg)
-{
- u64 mm_size, min_page_size, chunk_size, start = 0;
- unsigned long flags = 0;
- struct drm_buddy mm;
- int *order;
- int err, i;
-
- DRM_RND_STATE(prng, random_seed);
- IGT_TIMEOUT(end_time);
-
- igt_mm_config(&mm_size, &chunk_size);
-
- err = drm_buddy_init(&mm, mm_size, chunk_size);
- if (err) {
- pr_err("buddy_init failed(%d)\n", err);
- return err;
- }
-
- order = drm_random_order(mm.max_order + 1, &prng);
- if (!order) {
- err = -ENOMEM;
- goto out_fini;
- }
-
- for (i = 0; i <= mm.max_order; ++i) {
- struct drm_buddy_block *block;
- int max_order = order[i];
- bool timeout = false;
- LIST_HEAD(blocks);
- u64 total, size;
- LIST_HEAD(tmp);
- int order;
-
- err = igt_check_mm(&mm);
- if (err) {
- pr_err("pre-mm check failed, abort\n");
- break;
- }
-
- order = max_order;
- total = 0;
-
- do {
-retry:
- size = min_page_size = get_size(order, chunk_size);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size,
- min_page_size, &tmp, flags);
- if (err) {
- if (err == -ENOMEM) {
- pr_info("buddy_alloc hit -ENOMEM with order=%d\n",
- order);
- } else {
- if (order--) {
- err = 0;
- goto retry;
- }
-
- pr_err("buddy_alloc with order=%d failed(%d)\n",
- order, err);
- }
-
- break;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- break;
- }
-
- list_move_tail(&block->link, &blocks);
-
- if (drm_buddy_block_order(block) != order) {
- pr_err("buddy_alloc order mismatch\n");
- err = -EINVAL;
- break;
- }
-
- total += drm_buddy_block_size(&mm, block);
-
- if (__igt_timeout(end_time, NULL)) {
- timeout = true;
- break;
- }
- } while (total < mm.size);
-
- if (!err)
- err = igt_check_blocks(&mm, &blocks, total, false);
-
- drm_buddy_free_list(&mm, &blocks);
-
- if (!err) {
- err = igt_check_mm(&mm);
- if (err)
- pr_err("post-mm check failed\n");
- }
-
- if (err || timeout)
- break;
-
- cond_resched();
- }
-
- if (err == -ENOMEM)
- err = 0;
-
- kfree(order);
-out_fini:
- drm_buddy_fini(&mm);
-
- return err;
-}
-
-static int igt_buddy_alloc_pessimistic(void *arg)
-{
- u64 mm_size, size, min_page_size, start = 0;
- struct drm_buddy_block *block, *bn;
- const unsigned int max_order = 16;
- unsigned long flags = 0;
- struct drm_buddy mm;
- unsigned int order;
- LIST_HEAD(blocks);
- LIST_HEAD(tmp);
- int err;
-
- /*
- * Create a pot-sized mm, then allocate one of each possible
- * order within. This should leave the mm with exactly one
- * page left.
- */
-
- mm_size = PAGE_SIZE << max_order;
- err = drm_buddy_init(&mm, mm_size, PAGE_SIZE);
- if (err) {
- pr_err("buddy_init failed(%d)\n", err);
- return err;
- }
- BUG_ON(mm.max_order != max_order);
-
- for (order = 0; order < max_order; order++) {
- size = min_page_size = get_size(order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc hit -ENOMEM with order=%d\n",
- order);
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- }
-
- /* And now the last remaining block available */
- size = min_page_size = get_size(0, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc hit -ENOMEM on final alloc\n");
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
-
- /* Should be completely full! */
- for (order = max_order; order--; ) {
- size = min_page_size = get_size(order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (!err) {
- pr_info("buddy_alloc unexpectedly succeeded at order %d, it should be full!",
- order);
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- err = -EINVAL;
- goto err;
- }
- }
-
- block = list_last_entry(&blocks, typeof(*block), link);
- list_del(&block->link);
- drm_buddy_free_block(&mm, block);
-
- /* As we free in increasing size, we make available larger blocks */
- order = 1;
- list_for_each_entry_safe(block, bn, &blocks, link) {
- list_del(&block->link);
- drm_buddy_free_block(&mm, block);
-
- size = min_page_size = get_size(order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc (realloc) hit -ENOMEM with order=%d\n",
- order);
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_del(&block->link);
- drm_buddy_free_block(&mm, block);
- order++;
- }
-
- /* To confirm, now the whole mm should be available */
- size = min_page_size = get_size(max_order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc (realloc) hit -ENOMEM with order=%d\n",
- max_order);
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_del(&block->link);
- drm_buddy_free_block(&mm, block);
-
-err:
- drm_buddy_free_list(&mm, &blocks);
- drm_buddy_fini(&mm);
- return err;
-}
-
-static int igt_buddy_alloc_optimistic(void *arg)
-{
- u64 mm_size, size, min_page_size, start = 0;
- struct drm_buddy_block *block;
- unsigned long flags = 0;
- const int max_order = 16;
- struct drm_buddy mm;
- LIST_HEAD(blocks);
- LIST_HEAD(tmp);
- int order, err;
-
- /*
- * Create a mm with one block of each order available, and
- * try to allocate them all.
- */
-
- mm_size = PAGE_SIZE * ((1 << (max_order + 1)) - 1);
- err = drm_buddy_init(&mm,
- mm_size,
- PAGE_SIZE);
- if (err) {
- pr_err("buddy_init failed(%d)\n", err);
- return err;
- }
-
- BUG_ON(mm.max_order != max_order);
-
- for (order = 0; order <= max_order; order++) {
- size = min_page_size = get_size(order, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (err) {
- pr_info("buddy_alloc hit -ENOMEM with order=%d\n",
- order);
- goto err;
- }
-
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- }
-
- /* Should be completely full! */
- size = min_page_size = get_size(0, PAGE_SIZE);
- err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, min_page_size, &tmp, flags);
- if (!err) {
- pr_info("buddy_alloc unexpectedly succeeded, it should be full!");
- block = list_first_entry_or_null(&tmp,
- struct drm_buddy_block,
- link);
- if (!block) {
- pr_err("alloc_blocks has no blocks\n");
- err = -EINVAL;
- goto err;
- }
-
- list_move_tail(&block->link, &blocks);
- err = -EINVAL;
- goto err;
- } else {
- err = 0;
- }
-
-err:
- drm_buddy_free_list(&mm, &blocks);
- drm_buddy_fini(&mm);
- return err;
-}
-
-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 size = U64_MAX, start = 0;
- struct drm_buddy_block *block;
- unsigned long flags = 0;
- LIST_HEAD(allocated);
- struct drm_buddy mm;
- int err;
-
- err = drm_buddy_init(&mm, size, PAGE_SIZE);
- if (err)
- return err;
-
- if (mm.max_order != DRM_BUDDY_MAX_ORDER) {
- pr_err("mm.max_order(%d) != %d\n",
- mm.max_order, DRM_BUDDY_MAX_ORDER);
- err = -EINVAL;
- goto out_fini;
- }
-
- size = mm.chunk_size << mm.max_order;
- err = drm_buddy_alloc_blocks(&mm, start, size, size,
- PAGE_SIZE, &allocated, flags);
-
- if (unlikely(err))
- goto out_free;
-
- block = list_first_entry_or_null(&allocated,
- struct drm_buddy_block,
- link);
-
- if (!block) {
- err = -EINVAL;
- goto out_fini;
- }
-
- if (drm_buddy_block_order(block) != mm.max_order) {
- pr_err("block order(%d) != %d\n",
- drm_buddy_block_order(block), mm.max_order);
- err = -EINVAL;
- goto out_free;
- }
-
- if (drm_buddy_block_size(&mm, block) !=
- BIT_ULL(mm.max_order) * PAGE_SIZE) {
- pr_err("block size(%llu) != %llu\n",
- drm_buddy_block_size(&mm, block),
- BIT_ULL(mm.max_order) * PAGE_SIZE);
- err = -EINVAL;
- goto out_free;
- }
-
-out_free:
- drm_buddy_free_list(&mm, &allocated);
-out_fini:
- drm_buddy_fini(&mm);
- return err;
-}
-
-static int igt_sanitycheck(void *ignored)
-{
- pr_info("%s - ok!\n", __func__);
- return 0;
-}
-
-#include "drm_selftest.c"
-
-static int __init test_drm_buddy_init(void)
-{
- int err;
-
- while (!random_seed)
- random_seed = get_random_int();
-
- pr_info("Testing DRM buddy manager (struct drm_buddy), with random_seed=0x%x\n",
- random_seed);
- err = run_selftests(selftests, ARRAY_SIZE(selftests), NULL);
-
- return err > 0 ? 0 : err;
-}
-
-static void __exit test_drm_buddy_exit(void)
-{
-}
-
-module_init(test_drm_buddy_init);
-module_exit(test_drm_buddy_exit);
-
-MODULE_AUTHOR("Intel Corporation");
-MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
index 4cbfd9098d56..cff59189598f 100644
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -2,4 +2,4 @@

obj-$(CONFIG_DRM_KUNIT_TEST) += drm_format_helper_test.o drm_damage_helper_test.o \
drm_cmdline_parser_test.o drm_rect_test.o drm_format_test.o drm_plane_helper_test.o \
- drm_dp_mst_helper_test.o drm_framebuffer_test.o
+ drm_dp_mst_helper_test.o drm_framebuffer_test.o drm_buddy_test.o
diff --git a/drivers/gpu/drm/tests/drm_buddy_test.c b/drivers/gpu/drm/tests/drm_buddy_test.c
new file mode 100644
index 000000000000..7f273a70d6ff
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_buddy_test.c
@@ -0,0 +1,748 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include <kunit/test.h>
+#include <linux/prime_numbers.h>
+#include <linux/sched/signal.h>
+
+#include <drm/drm_buddy.h>
+
+#include "../lib/drm_random.h"
+
+#define IGT_TIMEOUT(name__) \
+ unsigned long name__ = jiffies + MAX_SCHEDULE_TIMEOUT
+
+static unsigned int random_seed;
+
+static inline u64 get_size(int order, u64 chunk_size)
+{
+ return (1 << order) * chunk_size;
+}
+
+__printf(2, 3)
+static bool __igt_timeout(unsigned long timeout, const char *fmt, ...)
+{
+ va_list va;
+
+ if (!signal_pending(current)) {
+ cond_resched();
+ if (time_before(jiffies, timeout))
+ return false;
+ }
+
+ if (fmt) {
+ va_start(va, fmt);
+ vprintk(fmt, va);
+ va_end(va);
+ }
+
+ return true;
+}
+
+static void __igt_dump_block(struct kunit *test, struct drm_buddy *mm,
+ struct drm_buddy_block *block, bool buddy)
+{
+ kunit_err(test, "block info: header=%llx, state=%u, order=%d, offset=%llx size=%llx root=%d buddy=%d\n",
+ block->header, drm_buddy_block_state(block),
+ drm_buddy_block_order(block), drm_buddy_block_offset(block),
+ drm_buddy_block_size(mm, block), !block->parent, buddy);
+}
+
+static void igt_dump_block(struct kunit *test, struct drm_buddy *mm,
+ struct drm_buddy_block *block)
+{
+ struct drm_buddy_block *buddy;
+
+ __igt_dump_block(test, mm, block, false);
+
+ buddy = drm_get_buddy(block);
+ if (buddy)
+ __igt_dump_block(test, mm, buddy, true);
+}
+
+static int igt_check_block(struct kunit *test, 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) {
+ kunit_err(test, "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) {
+ kunit_err(test, "block size smaller than min size\n");
+ err = -EINVAL;
+ }
+
+ if (!is_power_of_2(block_size)) {
+ kunit_err(test, "block size not power of two\n");
+ err = -EINVAL;
+ }
+
+ if (!IS_ALIGNED(block_size, mm->chunk_size)) {
+ kunit_err(test, "block size not aligned to min size\n");
+ err = -EINVAL;
+ }
+
+ if (!IS_ALIGNED(offset, mm->chunk_size)) {
+ kunit_err(test, "block offset not aligned to min size\n");
+ err = -EINVAL;
+ }
+
+ if (!IS_ALIGNED(offset, block_size)) {
+ kunit_err(test, "block offset not aligned to block size\n");
+ err = -EINVAL;
+ }
+
+ buddy = drm_get_buddy(block);
+
+ if (!buddy && block->parent) {
+ kunit_err(test, "buddy has gone fishing\n");
+ err = -EINVAL;
+ }
+
+ if (buddy) {
+ if (drm_buddy_block_offset(buddy) != (offset ^ block_size)) {
+ kunit_err(test, "buddy has wrong offset\n");
+ err = -EINVAL;
+ }
+
+ if (drm_buddy_block_size(mm, buddy) != block_size) {
+ kunit_err(test, "buddy size mismatch\n");
+ err = -EINVAL;
+ }
+
+ if (drm_buddy_block_state(buddy) == block_state &&
+ block_state == DRM_BUDDY_FREE) {
+ kunit_err(test, "block and its buddy are free\n");
+ err = -EINVAL;
+ }
+ }
+
+ return err;
+}
+
+static int igt_check_blocks(struct kunit *test, 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(test, mm, block);
+
+ if (!drm_buddy_block_is_allocated(block)) {
+ kunit_err(test, "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)) {
+ kunit_err(test, "block offset mismatch\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (err)
+ break;
+
+ total += drm_buddy_block_size(mm, block);
+ prev = block;
+ }
+
+ if (!err) {
+ if (total != expected_size) {
+ kunit_err(test, "size mismatch, expected=%llx, found=%llx\n",
+ expected_size, total);
+ err = -EINVAL;
+ }
+ return err;
+ }
+
+ if (prev) {
+ kunit_err(test, "prev block, dump:\n");
+ igt_dump_block(test, mm, prev);
+ }
+
+ kunit_err(test, "bad block, dump:\n");
+ igt_dump_block(test, mm, block);
+
+ return err;
+}
+
+static int igt_check_mm(struct kunit *test, 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) {
+ kunit_err(test, "n_roots is zero\n");
+ return -EINVAL;
+ }
+
+ if (mm->n_roots != hweight64(mm->size)) {
+ kunit_err(test, "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) {
+ kunit_err(test, "root(%u) is NULL\n", i);
+ err = -EINVAL;
+ break;
+ }
+
+ err = igt_check_block(test, mm, root);
+
+ if (!drm_buddy_block_is_free(root)) {
+ kunit_err(test, "root not free\n");
+ err = -EINVAL;
+ }
+
+ order = drm_buddy_block_order(root);
+
+ if (!i) {
+ if (order != mm->max_order) {
+ kunit_err(test, "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)) {
+ kunit_err(test, "root offset mismatch\n");
+ err = -EINVAL;
+ }
+ }
+
+ block = list_first_entry_or_null(&mm->free_list[order],
+ struct drm_buddy_block, link);
+ if (block != root) {
+ kunit_err(test, "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) {
+ kunit_err(test, "expected mm size=%llx, found=%llx\n",
+ mm->size, total);
+ err = -EINVAL;
+ }
+ return err;
+ }
+
+ if (prev) {
+ kunit_err(test, "prev root(%u), dump:\n", i - 1);
+ igt_dump_block(test, mm, prev);
+ }
+
+ if (root) {
+ kunit_err(test, "bad root(%u), dump:\n", i);
+ igt_dump_block(test, 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 void igt_buddy_alloc_pathological(struct kunit *test)
+{
+ u64 mm_size, size, start = 0;
+ struct drm_buddy_block *block;
+ const int max_order = 3;
+ unsigned long flags = 0;
+ int order, top;
+ struct drm_buddy mm;
+ LIST_HEAD(blocks);
+ LIST_HEAD(holes);
+ LIST_HEAD(tmp);
+
+ /*
+ * Create a pot-sized mm, then allocate one of each possible
+ * order within. This should leave the mm with exactly one
+ * page left. Free the largest block, then whittle down again.
+ * Eventually we will have a fully 50% fragmented mm.
+ */
+
+ mm_size = PAGE_SIZE << max_order;
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
+ "buddy_init failed\n");
+
+ KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
+
+ for (top = max_order; top; top--) {
+ /* Make room by freeing the largest allocated block */
+ block = list_first_entry_or_null(&blocks, typeof(*block), link);
+ if (block) {
+ list_del(&block->link);
+ drm_buddy_free_block(&mm, block);
+ }
+
+ for (order = top; order--;) {
+ size = get_size(order, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start,
+ mm_size, size, size, &tmp, flags),
+ "buddy_alloc hit -ENOMEM with order=%d, top=%d\n",
+ order, top);
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_move_tail(&block->link, &blocks);
+ }
+
+ /* There should be one final page for this sub-allocation */
+ size = get_size(0, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc hit -ENOMEM for hole\n");
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_move_tail(&block->link, &holes);
+
+ size = get_size(top, PAGE_SIZE);
+ KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc unexpectedly succeeded at top-order %d/%d, it should be full!",
+ top, max_order);
+ }
+
+ drm_buddy_free_list(&mm, &holes);
+
+ /* Nothing larger than blocks of chunk_size now available */
+ for (order = 1; order <= max_order; order++) {
+ size = get_size(order, PAGE_SIZE);
+ KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc unexpectedly succeeded at order %d, it should be full!",
+ order);
+ }
+
+ list_splice_tail(&holes, &blocks);
+ drm_buddy_free_list(&mm, &blocks);
+ drm_buddy_fini(&mm);
+}
+
+static void igt_buddy_alloc_smoke(struct kunit *test)
+{
+ u64 mm_size, chunk_size, start = 0;
+ unsigned long flags = 0;
+ struct drm_buddy mm;
+ int *order;
+ int i;
+
+ DRM_RND_STATE(prng, random_seed);
+ IGT_TIMEOUT(end_time);
+
+ igt_mm_config(&mm_size, &chunk_size);
+
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, chunk_size),
+ "buddy_init failed\n");
+
+ order = drm_random_order(mm.max_order + 1, &prng);
+ KUNIT_ASSERT_TRUE(test, order);
+
+ for (i = 0; i <= mm.max_order; ++i) {
+ struct drm_buddy_block *block;
+ int max_order = order[i];
+ bool timeout = false;
+ LIST_HEAD(blocks);
+ u64 total, size;
+ LIST_HEAD(tmp);
+ int order, err;
+
+ KUNIT_ASSERT_FALSE_MSG(test, igt_check_mm(test, &mm),
+ "pre-mm check failed, abort\n");
+
+ order = max_order;
+ total = 0;
+
+ do {
+retry:
+ size = get_size(order, chunk_size);
+ err = drm_buddy_alloc_blocks(&mm, start, mm_size, size, size, &tmp, flags);
+ if (err) {
+ if (err == -ENOMEM) {
+ KUNIT_FAIL(test, "buddy_alloc hit -ENOMEM with order=%d\n",
+ order);
+ } else {
+ if (order--) {
+ err = 0;
+ goto retry;
+ }
+
+ KUNIT_FAIL(test, "buddy_alloc with order=%d failed\n", order);
+ }
+
+ break;
+ }
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_move_tail(&block->link, &blocks);
+ KUNIT_EXPECT_EQ_MSG(test, drm_buddy_block_order(block), order,
+ "buddy_alloc order mismatch\n");
+
+ total += drm_buddy_block_size(&mm, block);
+
+ if (__igt_timeout(end_time, NULL)) {
+ timeout = true;
+ break;
+ }
+ } while (total < mm.size);
+
+ if (!err)
+ err = igt_check_blocks(test, &mm, &blocks, total, false);
+
+ drm_buddy_free_list(&mm, &blocks);
+
+ if (!err) {
+ KUNIT_EXPECT_FALSE_MSG(test, igt_check_mm(test, &mm),
+ "post-mm check failed\n");
+ }
+
+ if (err || timeout)
+ break;
+
+ cond_resched();
+ }
+
+ kfree(order);
+ drm_buddy_fini(&mm);
+}
+
+static void igt_buddy_alloc_pessimistic(struct kunit *test)
+{
+ u64 mm_size, size, start = 0;
+ struct drm_buddy_block *block, *bn;
+ const unsigned int max_order = 16;
+ unsigned long flags = 0;
+ struct drm_buddy mm;
+ unsigned int order;
+ LIST_HEAD(blocks);
+ LIST_HEAD(tmp);
+
+ /*
+ * Create a pot-sized mm, then allocate one of each possible
+ * order within. This should leave the mm with exactly one
+ * page left.
+ */
+
+ mm_size = PAGE_SIZE << max_order;
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
+ "buddy_init failed\n");
+
+ KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
+
+ for (order = 0; order < max_order; order++) {
+ size = get_size(order, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc hit -ENOMEM with order=%d\n", order);
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_move_tail(&block->link, &blocks);
+ }
+
+ /* And now the last remaining block available */
+ size = get_size(0, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc hit -ENOMEM on final alloc\n");
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_move_tail(&block->link, &blocks);
+
+ /* Should be completely full! */
+ for (order = max_order; order--;) {
+ size = get_size(order, PAGE_SIZE);
+ KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc unexpectedly succeeded, it should be full!");
+ }
+
+ block = list_last_entry(&blocks, typeof(*block), link);
+ list_del(&block->link);
+ drm_buddy_free_block(&mm, block);
+
+ /* As we free in increasing size, we make available larger blocks */
+ order = 1;
+ list_for_each_entry_safe(block, bn, &blocks, link) {
+ list_del(&block->link);
+ drm_buddy_free_block(&mm, block);
+
+ size = get_size(order, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc hit -ENOMEM with order=%d\n", order);
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_del(&block->link);
+ drm_buddy_free_block(&mm, block);
+ order++;
+ }
+
+ /* To confirm, now the whole mm should be available */
+ size = get_size(max_order, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc (realloc) hit -ENOMEM with order=%d\n", max_order);
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_del(&block->link);
+ drm_buddy_free_block(&mm, block);
+ drm_buddy_free_list(&mm, &blocks);
+ drm_buddy_fini(&mm);
+}
+
+static void igt_buddy_alloc_optimistic(struct kunit *test)
+{
+ u64 mm_size, size, start = 0;
+ struct drm_buddy_block *block;
+ unsigned long flags = 0;
+ const int max_order = 16;
+ struct drm_buddy mm;
+ LIST_HEAD(blocks);
+ LIST_HEAD(tmp);
+ int order;
+
+ /*
+ * Create a mm with one block of each order available, and
+ * try to allocate them all.
+ */
+
+ mm_size = PAGE_SIZE * ((1 << (max_order + 1)) - 1);
+
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, mm_size, PAGE_SIZE),
+ "buddy_init failed\n");
+
+ KUNIT_EXPECT_EQ(test, mm.max_order, max_order);
+
+ for (order = 0; order <= max_order; order++) {
+ size = get_size(order, PAGE_SIZE);
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc hit -ENOMEM with order=%d\n", order);
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_blocks has no blocks\n");
+
+ list_move_tail(&block->link, &blocks);
+ }
+
+ /* Should be completely full! */
+ size = get_size(0, PAGE_SIZE);
+ KUNIT_ASSERT_TRUE_MSG(test, drm_buddy_alloc_blocks(&mm, start, mm_size,
+ size, size, &tmp, flags),
+ "buddy_alloc unexpectedly succeeded, it should be full!");
+
+ drm_buddy_free_list(&mm, &blocks);
+ drm_buddy_fini(&mm);
+}
+
+static void igt_buddy_alloc_range(struct kunit *test)
+{
+ 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);
+
+ igt_mm_config(&size, &chunk_size);
+
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_init(&mm, size, chunk_size),
+ "buddy_init failed");
+
+ KUNIT_ASSERT_FALSE_MSG(test, igt_check_mm(test, &mm),
+ "pre-mm check failed, abort!");
+
+ 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;
+
+ KUNIT_ASSERT_FALSE_MSG(test, drm_buddy_alloc_blocks(&mm, offset, end,
+ size, mm.chunk_size, &tmp, flags),
+ "alloc_range with offset=%llx, size=%llx failed\n",
+ offset, size);
+
+ block = list_first_entry_or_null(&tmp, struct drm_buddy_block, link);
+ KUNIT_ASSERT_TRUE_MSG(test, block, "alloc_range has no blocks\n");
+
+ KUNIT_ASSERT_EQ_MSG(test, drm_buddy_block_offset(block), offset,
+ "alloc_range start offset mismatch, found=%llx, expected=%llx\n",
+ drm_buddy_block_offset(block), offset);
+
+ KUNIT_ASSERT_FALSE(test, igt_check_blocks(test, &mm, &tmp, size, true));
+
+ list_splice_tail(&tmp, &blocks);
+
+ offset += size;
+
+ rem -= size;
+ if (!rem)
+ break;
+
+ cond_resched();
+ }
+
+ drm_buddy_free_list(&mm, &blocks);
+
+ KUNIT_EXPECT_FALSE_MSG(test, igt_check_mm(test, &mm), "post-mm check failed\n");
+
+ drm_buddy_fini(&mm);
+}
+
+static void igt_buddy_alloc_limit(struct kunit *test)
+{
+ u64 size = U64_MAX, start = 0;
+ struct drm_buddy_block *block;
+ unsigned long flags = 0;
+ LIST_HEAD(allocated);
+ struct drm_buddy mm;
+
+ KUNIT_EXPECT_FALSE(test, drm_buddy_init(&mm, size, PAGE_SIZE));
+
+ KUNIT_EXPECT_EQ_MSG(test, mm.max_order, DRM_BUDDY_MAX_ORDER,
+ "mm.max_order(%d) != %d\n", mm.max_order,
+ DRM_BUDDY_MAX_ORDER);
+
+ size = mm.chunk_size << mm.max_order;
+ KUNIT_EXPECT_FALSE(test, drm_buddy_alloc_blocks(&mm, start, size, size,
+ PAGE_SIZE, &allocated, flags));
+
+ block = list_first_entry_or_null(&allocated, struct drm_buddy_block, link);
+ KUNIT_EXPECT_TRUE(test, block);
+
+ KUNIT_EXPECT_EQ_MSG(test, drm_buddy_block_order(block), mm.max_order,
+ "block order(%d) != %d\n",
+ drm_buddy_block_order(block), mm.max_order);
+
+ KUNIT_EXPECT_EQ_MSG(test, drm_buddy_block_size(&mm, block),
+ BIT_ULL(mm.max_order) * PAGE_SIZE,
+ "block size(%llu) != %llu\n",
+ drm_buddy_block_size(&mm, block),
+ BIT_ULL(mm.max_order) * PAGE_SIZE);
+
+ drm_buddy_free_list(&mm, &allocated);
+ drm_buddy_fini(&mm);
+}
+
+static int drm_buddy_init_test(struct kunit *test)
+{
+ while (!random_seed)
+ random_seed = get_random_int();
+
+ return 0;
+}
+
+static struct kunit_case drm_buddy_tests[] = {
+ KUNIT_CASE(igt_buddy_alloc_limit),
+ KUNIT_CASE(igt_buddy_alloc_range),
+ KUNIT_CASE(igt_buddy_alloc_optimistic),
+ KUNIT_CASE(igt_buddy_alloc_pessimistic),
+ KUNIT_CASE(igt_buddy_alloc_smoke),
+ KUNIT_CASE(igt_buddy_alloc_pathological),
+ {}
+};
+
+static struct kunit_suite drm_buddy_test_suite = {
+ .name = "drm_buddy",
+ .init = drm_buddy_init_test,
+ .test_cases = drm_buddy_tests,
+};
+
+kunit_test_suite(drm_buddy_test_suite);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL");
--
2.36.1
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