--- /dev/null
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include <linux/prime_numbers.h>
+
+#include "../i915_selftest.h"
+#include "i915_random.h"
+
+#define SZ_8G (1ULL << 33)
+
+static void __igt_dump_block(struct i915_buddy_mm *mm,
+ struct i915_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,
+ i915_buddy_block_state(block),
+ i915_buddy_block_order(block),
+ i915_buddy_block_offset(block),
+ i915_buddy_block_size(mm, block),
+ yesno(!block->parent),
+ yesno(buddy));
+}
+
+static void igt_dump_block(struct i915_buddy_mm *mm,
+ struct i915_buddy_block *block)
+{
+ struct i915_buddy_block *buddy;
+
+ __igt_dump_block(mm, block, false);
+
+ buddy = get_buddy(block);
+ if (buddy)
+ __igt_dump_block(mm, buddy, true);
+}
+
+static int igt_check_block(struct i915_buddy_mm *mm,
+ struct i915_buddy_block *block)
+{
+ struct i915_buddy_block *buddy;
+ unsigned int block_state;
+ u64 block_size;
+ u64 offset;
+ int err = 0;
+
+ block_state = i915_buddy_block_state(block);
+
+ if (block_state != I915_BUDDY_ALLOCATED &&
+ block_state != I915_BUDDY_FREE &&
+ block_state != I915_BUDDY_SPLIT) {
+ pr_err("block state mismatch\n");
+ err = -EINVAL;
+ }
+
+ block_size = i915_buddy_block_size(mm, block);
+ offset = i915_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 = get_buddy(block);
+
+ if (!buddy && block->parent) {
+ pr_err("buddy has gone fishing\n");
+ err = -EINVAL;
+ }
+
+ if (buddy) {
+ if (i915_buddy_block_offset(buddy) != (offset ^ block_size)) {
+ pr_err("buddy has wrong offset\n");
+ err = -EINVAL;
+ }
+
+ if (i915_buddy_block_size(mm, buddy) != block_size) {
+ pr_err("buddy size mismatch\n");
+ err = -EINVAL;
+ }
+
+ if (i915_buddy_block_state(buddy) == block_state &&
+ block_state == I915_BUDDY_FREE) {
+ pr_err("block and its buddy are free\n");
+ err = -EINVAL;
+ }
+ }
+
+ return err;
+}
+
+static int igt_check_blocks(struct i915_buddy_mm *mm,
+ struct list_head *blocks,
+ u64 expected_size,
+ bool is_contiguous)
+{
+ struct i915_buddy_block *block;
+ struct i915_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 (!i915_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 = i915_buddy_block_offset(prev);
+ prev_block_size = i915_buddy_block_size(mm, prev);
+ offset = i915_buddy_block_offset(block);
+
+ if (offset != (prev_offset + prev_block_size)) {
+ pr_err("block offset mismatch\n");
+ err = -EINVAL;
+ }
+ }
+
+ if (err)
+ break;
+
+ total += i915_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);
+ }
+
+ if (block) {
+ pr_err("bad block, dump:\n");
+ igt_dump_block(mm, block);
+ }
+
+ return err;
+}
+
+static int igt_check_mm(struct i915_buddy_mm *mm)
+{
+ struct i915_buddy_block *root;
+ struct i915_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 i915_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 (!i915_buddy_block_is_free(root)) {
+ pr_err("root not free\n");
+ err = -EINVAL;
+ }
+
+ order = i915_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 = i915_buddy_block_offset(prev);
+ prev_block_size = i915_buddy_block_size(mm, prev);
+ offset = i915_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 i915_buddy_block,
+ link);
+ if (block != root) {
+ pr_err("root mismatch at order=%u\n", order);
+ err = -EINVAL;
+ }
+
+ if (err)
+ break;
+
+ prev = root;
+ total += i915_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)
+{
+ I915_RND_STATE(prng);
+ u64 s, ms;
+
+ /* Nothing fancy, just try to get an interesting bit pattern */
+
+ prandom_seed_state(&prng, i915_selftest.random_seed);
+
+ s = i915_prandom_u64_state(&prng) & (SZ_8G - 1);
+ ms = BIT_ULL(12 + (prandom_u32_state(&prng) % ilog2(s >> 12)));
+ s = max(s & -ms, ms);
+
+ *chunk_size = ms;
+ *size = s;
+}
+
+static int igt_buddy_alloc_smoke(void *arg)
+{
+ struct i915_buddy_mm mm;
+ int max_order;
+ u64 chunk_size;
+ u64 mm_size;
+ int err;
+
+ igt_mm_config(&mm_size, &chunk_size);
+
+ pr_info("buddy_init with size=%llx, chunk_size=%llx\n", mm_size, chunk_size);
+
+ err = i915_buddy_init(&mm, mm_size, chunk_size);
+ if (err) {
+ pr_err("buddy_init failed(%d)\n", err);
+ return err;
+ }
+
+ for (max_order = mm.max_order; max_order >= 0; max_order--) {
+ struct i915_buddy_block *block;
+ int order;
+ LIST_HEAD(blocks);
+ u64 total;
+
+ err = igt_check_mm(&mm);
+ if (err) {
+ pr_err("pre-mm check failed, abort\n");
+ break;
+ }
+
+ pr_info("filling from max_order=%u\n", max_order);
+
+ order = max_order;
+ total = 0;
+
+ do {
+retry:
+ block = i915_buddy_alloc(&mm, order);
+ if (IS_ERR(block)) {
+ err = PTR_ERR(block);
+ 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;
+ }
+
+ list_add_tail(&block->link, &blocks);
+
+ if (i915_buddy_block_order(block) != order) {
+ pr_err("buddy_alloc order mismatch\n");
+ err = -EINVAL;
+ break;
+ }
+
+ total += i915_buddy_block_size(&mm, block);
+ } while (total < mm.size);
+
+ if (!err)
+ err = igt_check_blocks(&mm, &blocks, total, false);
+
+ i915_buddy_free_list(&mm, &blocks);
+
+ if (!err) {
+ err = igt_check_mm(&mm);
+ if (err)
+ pr_err("post-mm check failed\n");
+ }
+
+ if (err)
+ break;
+ }
+
+ if (err == -ENOMEM)
+ err = 0;
+
+ i915_buddy_fini(&mm);
+
+ return err;
+}
+
+static int igt_buddy_alloc_pessimistic(void *arg)
+{
+ const unsigned int max_order = 16;
+ struct i915_buddy_block *block, *bn;
+ struct i915_buddy_mm mm;
+ unsigned int order;
+ LIST_HEAD(blocks);
+ 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.
+ */
+
+ err = i915_buddy_init(&mm, PAGE_SIZE << max_order, PAGE_SIZE);
+ if (err) {
+ pr_err("buddy_init failed(%d)\n", err);
+ return err;
+ }
+ GEM_BUG_ON(mm.max_order != max_order);
+
+ for (order = 0; order < max_order; order++) {
+ block = i915_buddy_alloc(&mm, order);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc hit -ENOMEM with order=%d\n",
+ order);
+ err = PTR_ERR(block);
+ goto err;
+ }
+
+ list_add_tail(&block->link, &blocks);
+ }
+
+ /* And now the last remaining block available */
+ block = i915_buddy_alloc(&mm, 0);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc hit -ENOMEM on final alloc\n");
+ err = PTR_ERR(block);
+ goto err;
+ }
+ list_add_tail(&block->link, &blocks);
+
+ /* Should be completely full! */
+ for (order = max_order; order--; ) {
+ block = i915_buddy_alloc(&mm, order);
+ if (!IS_ERR(block)) {
+ pr_info("buddy_alloc unexpectedly succeeded at order %d, it should be full!",
+ order);
+ list_add_tail(&block->link, &blocks);
+ err = -EINVAL;
+ goto err;
+ }
+ }
+
+ block = list_last_entry(&blocks, typeof(*block), link);
+ list_del(&block->link);
+ i915_buddy_free(&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);
+ i915_buddy_free(&mm, block);
+
+ block = i915_buddy_alloc(&mm, order);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc (realloc) hit -ENOMEM with order=%d\n",
+ order);
+ err = PTR_ERR(block);
+ goto err;
+ }
+ i915_buddy_free(&mm, block);
+ order++;
+ }
+
+ /* To confirm, now the whole mm should be available */
+ block = i915_buddy_alloc(&mm, max_order);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc (realloc) hit -ENOMEM with order=%d\n",
+ max_order);
+ err = PTR_ERR(block);
+ goto err;
+ }
+ i915_buddy_free(&mm, block);
+
+err:
+ i915_buddy_free_list(&mm, &blocks);
+ i915_buddy_fini(&mm);
+ return err;
+}
+
+static int igt_buddy_alloc_optimistic(void *arg)
+{
+ const int max_order = 16;
+ struct i915_buddy_block *block;
+ struct i915_buddy_mm mm;
+ LIST_HEAD(blocks);
+ int order;
+ int err;
+
+ /*
+ * Create a mm with one block of each order available, and
+ * try to allocate them all.
+ */
+
+ err = i915_buddy_init(&mm,
+ PAGE_SIZE * ((1 << (max_order + 1)) - 1),
+ PAGE_SIZE);
+ if (err) {
+ pr_err("buddy_init failed(%d)\n", err);
+ return err;
+ }
+ GEM_BUG_ON(mm.max_order != max_order);
+
+ for (order = 0; order <= max_order; order++) {
+ block = i915_buddy_alloc(&mm, order);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc hit -ENOMEM with order=%d\n",
+ order);
+ err = PTR_ERR(block);
+ goto err;
+ }
+
+ list_add_tail(&block->link, &blocks);
+ }
+
+ /* Should be completely full! */
+ block = i915_buddy_alloc(&mm, 0);
+ if (!IS_ERR(block)) {
+ pr_info("buddy_alloc unexpectedly succeeded, it should be full!");
+ list_add_tail(&block->link, &blocks);
+ err = -EINVAL;
+ goto err;
+ }
+
+err:
+ i915_buddy_free_list(&mm, &blocks);
+ i915_buddy_fini(&mm);
+ return err;
+}
+
+static int igt_buddy_alloc_pathological(void *arg)
+{
+ const int max_order = 16;
+ struct i915_buddy_block *block;
+ struct i915_buddy_mm mm;
+ LIST_HEAD(blocks);
+ LIST_HEAD(holes);
+ int order, top;
+ 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. Free the largest block, then whittle down again.
+ * Eventually we will have a fully 50% fragmented mm.
+ */
+
+ err = i915_buddy_init(&mm, PAGE_SIZE << max_order, PAGE_SIZE);
+ if (err) {
+ pr_err("buddy_init failed(%d)\n", err);
+ return err;
+ }
+ GEM_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);
+ i915_buddy_free(&mm, block);
+ }
+
+ for (order = top; order--; ) {
+ block = i915_buddy_alloc(&mm, order);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc hit -ENOMEM with order=%d, top=%d\n",
+ order, top);
+ err = PTR_ERR(block);
+ goto err;
+ }
+ list_add_tail(&block->link, &blocks);
+ }
+
+ /* There should be one final page for this sub-allocation */
+ block = i915_buddy_alloc(&mm, 0);
+ if (IS_ERR(block)) {
+ pr_info("buddy_alloc hit -ENOMEM for hole\n");
+ err = PTR_ERR(block);
+ goto err;
+ }
+ list_add_tail(&block->link, &holes);
+
+ block = i915_buddy_alloc(&mm, top);
+ if (!IS_ERR(block)) {
+ pr_info("buddy_alloc unexpectedly succeeded at top-order %d/%d, it should be full!",
+ top, max_order);
+ list_add_tail(&block->link, &blocks);
+ err = -EINVAL;
+ goto err;
+ }
+ }
+
+ i915_buddy_free_list(&mm, &holes);
+
+ /* Nothing larger than blocks of chunk_size now available */
+ for (order = 1; order <= max_order; order++) {
+ block = i915_buddy_alloc(&mm, order);
+ if (!IS_ERR(block)) {
+ pr_info("buddy_alloc unexpectedly succeeded at order %d, it should be full!",
+ order);
+ list_add_tail(&block->link, &blocks);
+ err = -EINVAL;
+ goto err;
+ }
+ }
+
+err:
+ list_splice_tail(&holes, &blocks);
+ i915_buddy_free_list(&mm, &blocks);
+ i915_buddy_fini(&mm);
+ return err;
+}
+
+static int igt_buddy_alloc_range(void *arg)
+{
+ struct i915_buddy_mm mm;
+ unsigned long page_num;
+ LIST_HEAD(blocks);
+ u64 chunk_size;
+ u64 offset;
+ u64 size;
+ u64 rem;
+ int err;
+
+ igt_mm_config(&size, &chunk_size);
+
+ pr_info("buddy_init with size=%llx, chunk_size=%llx\n", size, chunk_size);
+
+ err = i915_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 i915_buddy_block *block;
+ LIST_HEAD(tmp);
+
+ size = min(page_num * mm.chunk_size, rem);
+
+ err = i915_buddy_alloc_range(&mm, &tmp, offset, size);
+ 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 i915_buddy_block,
+ link);
+ if (!block) {
+ pr_err("alloc_range has no blocks\n");
+ err = -EINVAL;
+ }
+
+ if (i915_buddy_block_offset(block) != offset) {
+ pr_err("alloc_range start offset mismatch, found=%llx, expected=%llx\n",
+ i915_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;
+ }
+
+ if (err == -ENOMEM)
+ err = 0;
+
+ i915_buddy_free_list(&mm, &blocks);
+
+ if (!err) {
+ err = igt_check_mm(&mm);
+ if (err)
+ pr_err("post-mm check failed\n");
+ }
+
+err_fini:
+ i915_buddy_fini(&mm);
+
+ return err;
+}
+
+int i915_buddy_mock_selftests(void)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(igt_buddy_alloc_pessimistic),
+ SUBTEST(igt_buddy_alloc_optimistic),
+ SUBTEST(igt_buddy_alloc_pathological),
+ SUBTEST(igt_buddy_alloc_smoke),
+ SUBTEST(igt_buddy_alloc_range),
+ };
+
+ return i915_subtests(tests, NULL);
+}
projects / linux-2.6-microblaze.git / blobdiff