Exercise drm_mm_insert_node(), check that we can't overfill a range and that the lists are correct after reserving/removing.
v2: Extract helpers for the repeated tests v3: Iterate over all allocation flags
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com --- drivers/gpu/drm/selftests/drm_mm_selftests.h | 1 + drivers/gpu/drm/selftests/test-drm_mm.c | 234 +++++++++++++++++++++++++++ 2 files changed, 235 insertions(+)
diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h index 693d85677e7f..727c6d7255e0 100644 --- a/drivers/gpu/drm/selftests/drm_mm_selftests.h +++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h @@ -9,3 +9,4 @@ selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */ selftest(init, igt_init) selftest(debug, igt_debug) selftest(reserve, igt_reserve) +selftest(insert, igt_insert) diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c index 673519cf41e1..2d78a5a0f98c 100644 --- a/drivers/gpu/drm/selftests/test-drm_mm.c +++ b/drivers/gpu/drm/selftests/test-drm_mm.c @@ -21,6 +21,23 @@ static unsigned int random_seed; static unsigned int max_iterations = 8192; static unsigned int max_prime = 128;
+enum { + DEFAULT, + TOPDOWN, + BEST, +}; + +static const struct insert_mode { + const char *name; + unsigned int search_flags; + unsigned int create_flags; +} insert_modes[] = { + [DEFAULT] = { "default", DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT }, + [TOPDOWN] = { "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP }, + [BEST] = { "best", DRM_MM_SEARCH_BEST, DRM_MM_CREATE_DEFAULT }, + {} +}; + static int igt_sanitycheck(void *ignored) { pr_info("%s - ok!\n", __func__); @@ -131,6 +148,48 @@ static bool assert_continuous(const struct drm_mm *mm, u64 size) return true; }
+static u64 misalignment(struct drm_mm_node *node, u64 alignment) +{ + u64 rem; + + if (!alignment) + return 0; + + div64_u64_rem(node->start, alignment, &rem); + return rem; +} + +static bool assert_node(struct drm_mm_node *node, struct drm_mm *mm, + u64 size, u64 alignment, unsigned long color) +{ + bool ok = true; + + if (!drm_mm_node_allocated(node) || node->mm != mm) { + pr_err("node not allocated\n"); + ok = false; + } + + if (node->size != size) { + pr_err("node has wrong size, found %llu, expected %llu\n", + node->size, size); + ok = false; + } + + if (misalignment(node, alignment)) { + pr_err("node is misalinged, start %llx rem %llu, expected alignment %llu\n", + node->start, misalignment(node, alignment), alignment); + ok = false; + } + + if (node->color != color) { + pr_err("node has wrong color, found %lu, expected %lu\n", + node->color, color); + ok = false; + } + + return ok; +} + static int igt_init(void *ignored) { const unsigned int size = 4096; @@ -451,6 +510,181 @@ static int igt_reserve(void *ignored) return 0; }
+static bool expect_insert(struct drm_mm *mm, struct drm_mm_node *node, + u64 size, u64 alignment, unsigned long color, + const struct insert_mode *mode) +{ + int err; + + err = drm_mm_insert_node_generic(mm, node, + size, alignment, color, + mode->search_flags, + mode->create_flags); + if (err) { + pr_err("insert (size=%llu, alignment=%llu, color=%lu, mode=%s) failed with err=%d\n", + size, alignment, color, mode->name, err); + return false; + } + + if (!assert_node(node, mm, size, alignment, color)) { + drm_mm_remove_node(node); + return false; + } + + return true; +} + +static bool expect_insert_fail(struct drm_mm *mm, u64 size) +{ + struct drm_mm_node tmp = {}; + int err; + + err = drm_mm_insert_node(mm, &tmp, size, 0, DRM_MM_SEARCH_DEFAULT); + if (likely(err == -ENOSPC)) + return true; + + if (!err) { + pr_err("impossible insert succeeded, node %llu + %llu\n", + tmp.start, tmp.size); + drm_mm_remove_node(&tmp); + } else { + pr_err("impossible insert failed with wrong error %d [expected %d], size %llu\n", + err, -ENOSPC, size); + } + return false; +} + +static int __igt_insert(unsigned int count, u64 size) +{ + DRM_RND_STATE(prng, random_seed); + const struct insert_mode *mode; + struct drm_mm mm; + struct drm_mm_node *nodes, *node, *next; + unsigned int *order, n, m, o = 0; + int ret; + + /* Fill a range with lots of nodes, check it doesn't fail too early */ + + DRM_MM_BUG_ON(!count); + DRM_MM_BUG_ON(!size); + + ret = -ENOMEM; + nodes = vzalloc(count * sizeof(*nodes)); + if (!nodes) + goto err; + + order = drm_random_order(count, &prng); + if (!order) + goto err_nodes; + + ret = -EINVAL; + drm_mm_init(&mm, 0, count * size); + + for (mode = insert_modes; mode->name; mode++) { + for (n = 0; n < count; n++) { + if (!expect_insert(&mm, &nodes[n], size, 0, n, mode)) { + pr_err("%s insert failed, size %llu step %d\n", + mode->name, size, n); + goto out; + } + } + + /* After random insertion the nodes should be in order */ + if (!assert_continuous(&mm, size)) + goto out; + + /* Repeated use should then fail */ + if (!expect_insert_fail(&mm, size)) + goto out; + + /* Remove one and reinsert, as the only hole it should refill itself */ + for (n = 0; n < count; n++) { + u64 addr = nodes[n].start; + + drm_mm_remove_node(&nodes[n]); + if (!expect_insert(&mm, &nodes[n], size, 0, n, mode)) { + pr_err("%s reinsert failed, size %llu step %d\n", + mode->name, size, n); + goto out; + } + + if (nodes[n].start != addr) { + pr_err("%s reinsert node moved, step %d, expected %llx, found %llx\n", + mode->name, n, addr, nodes[n].start); + goto out; + } + + if (!assert_continuous(&mm, size)) + goto out; + } + + /* Remove several, reinsert, check full */ + for_each_prime_number(n, min(max_prime, count)) { + for (m = 0; m < n; m++) { + node = &nodes[order[(o + m) % count]]; + drm_mm_remove_node(node); + } + + for (m = 0; m < n; m++) { + node = &nodes[order[(o + m) % count]]; + if (!expect_insert(&mm, node, size, 0, n, mode)) { + pr_err("%s multiple reinsert failed, size %llu step %d\n", + mode->name, size, n); + goto out; + } + } + + o += n; + + if (!assert_continuous(&mm, size)) + goto out; + + if (!expect_insert_fail(&mm, size)) + goto out; + } + + drm_mm_for_each_node_safe(node, next, &mm) + drm_mm_remove_node(node); + DRM_MM_BUG_ON(!drm_mm_clean(&mm)); + } + + ret = 0; +out: + drm_mm_for_each_node_safe(node, next, &mm) + drm_mm_remove_node(node); + drm_mm_takedown(&mm); + kfree(order); +err_nodes: + vfree(nodes); +err: + return ret; +} + +static int igt_insert(void *ignored) +{ + const unsigned int count = min_t(unsigned int, BIT(10), max_iterations); + unsigned int n; + int ret; + + for_each_prime_number(n, 54) { + u64 size = BIT_ULL(n); + + ret = __igt_insert(count, size - 1); + if (ret) + return ret; + + ret = __igt_insert(count, size); + if (ret) + return ret; + + ret = __igt_insert(count, size + 1); + if (ret) + return ret; + } + + return 0; +} + #include "drm_selftest.c"
static int __init test_drm_mm_init(void)