mirror of https://gitee.com/openkylin/linux.git
drm: kselftest for drm_mm and eviction
Check that we add arbitrary blocks to the eviction scanner in order to find the first minimal hole that matches our request. v2: Refactor out some common eviction code for later Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-15-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
Daniel Vetter
parent
9b26f2ed29
commit
560b328429
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@ -15,3 +15,4 @@ selftest(insert_range, igt_insert_range)
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selftest(align, igt_align)
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selftest(align, igt_align)
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selftest(align32, igt_align32)
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selftest(align32, igt_align32)
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selftest(align64, igt_align64)
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selftest(align64, igt_align64)
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selftest(evict, igt_evict)
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@ -36,6 +36,10 @@ static const struct insert_mode {
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[TOPDOWN] = { "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP },
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[TOPDOWN] = { "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP },
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[BEST] = { "best", DRM_MM_SEARCH_BEST, DRM_MM_CREATE_DEFAULT },
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[BEST] = { "best", DRM_MM_SEARCH_BEST, DRM_MM_CREATE_DEFAULT },
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{}
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{}
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}, evict_modes[] = {
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{ "default", DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT },
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{ "top-down", DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP },
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{}
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};
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};
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static int igt_sanitycheck(void *ignored)
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static int igt_sanitycheck(void *ignored)
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@ -1110,6 +1114,339 @@ static int igt_align64(void *ignored)
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return igt_align_pot(64);
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return igt_align_pot(64);
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}
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}
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static void show_scan(const struct drm_mm *scan)
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{
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pr_info("scan: hit [%llx, %llx], size=%lld, align=%d, color=%ld\n",
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scan->scan_hit_start, scan->scan_hit_end,
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scan->scan_size, scan->scan_alignment, scan->scan_color);
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}
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static void show_holes(const struct drm_mm *mm, int count)
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{
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u64 hole_start, hole_end;
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struct drm_mm_node *hole;
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drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
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struct drm_mm_node *next = list_next_entry(hole, node_list);
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const char *node1 = NULL, *node2 = NULL;
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if (hole->allocated)
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node1 = kasprintf(GFP_KERNEL,
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"[%llx + %lld, color=%ld], ",
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hole->start, hole->size, hole->color);
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if (next->allocated)
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node2 = kasprintf(GFP_KERNEL,
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", [%llx + %lld, color=%ld]",
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next->start, next->size, next->color);
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pr_info("%sHole [%llx - %llx, size %lld]%s\n",
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node1,
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hole_start, hole_end, hole_end - hole_start,
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node2);
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kfree(node2);
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kfree(node1);
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if (!--count)
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break;
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}
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}
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struct evict_node {
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struct drm_mm_node node;
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struct list_head link;
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};
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static bool evict_nodes(struct drm_mm *mm,
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struct evict_node *nodes,
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unsigned int *order,
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unsigned int count,
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struct list_head *evict_list)
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{
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struct evict_node *e, *en;
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unsigned int i;
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for (i = 0; i < count; i++) {
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e = &nodes[order ? order[i] : i];
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list_add(&e->link, evict_list);
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if (drm_mm_scan_add_block(&e->node))
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break;
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}
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list_for_each_entry_safe(e, en, evict_list, link) {
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if (!drm_mm_scan_remove_block(&e->node))
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list_del(&e->link);
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}
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if (list_empty(evict_list)) {
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pr_err("Failed to find eviction: size=%lld [avail=%d], align=%d (color=%lu)\n",
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mm->scan_size, count,
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mm->scan_alignment,
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mm->scan_color);
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return false;
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}
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list_for_each_entry(e, evict_list, link)
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drm_mm_remove_node(&e->node);
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return true;
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}
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static bool evict_nothing(struct drm_mm *mm,
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unsigned int total_size,
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struct evict_node *nodes)
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{
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LIST_HEAD(evict_list);
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struct evict_node *e;
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struct drm_mm_node *node;
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unsigned int n;
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drm_mm_init_scan(mm, 1, 0, 0);
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for (n = 0; n < total_size; n++) {
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e = &nodes[n];
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list_add(&e->link, &evict_list);
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drm_mm_scan_add_block(&e->node);
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}
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list_for_each_entry(e, &evict_list, link)
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drm_mm_scan_remove_block(&e->node);
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for (n = 0; n < total_size; n++) {
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e = &nodes[n];
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if (!drm_mm_node_allocated(&e->node)) {
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pr_err("node[%d] no longer allocated!\n", n);
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return false;
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}
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e->link.next = NULL;
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}
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drm_mm_for_each_node(node, mm) {
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e = container_of(node, typeof(*e), node);
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e->link.next = &e->link;
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}
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for (n = 0; n < total_size; n++) {
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e = &nodes[n];
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if (!e->link.next) {
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pr_err("node[%d] no longer connected!\n", n);
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return false;
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}
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}
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return assert_continuous(mm, nodes[0].node.size);
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}
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static bool evict_everything(struct drm_mm *mm,
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unsigned int total_size,
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struct evict_node *nodes)
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{
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LIST_HEAD(evict_list);
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struct evict_node *e;
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unsigned int n;
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int err;
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drm_mm_init_scan(mm, total_size, 0, 0);
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for (n = 0; n < total_size; n++) {
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e = &nodes[n];
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list_add(&e->link, &evict_list);
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drm_mm_scan_add_block(&e->node);
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}
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list_for_each_entry(e, &evict_list, link) {
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if (!drm_mm_scan_remove_block(&e->node)) {
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pr_err("Node %lld not marked for eviction!\n",
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e->node.start);
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list_del(&e->link);
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}
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}
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list_for_each_entry(e, &evict_list, link)
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drm_mm_remove_node(&e->node);
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if (!assert_one_hole(mm, 0, total_size))
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return false;
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list_for_each_entry(e, &evict_list, link) {
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err = drm_mm_reserve_node(mm, &e->node);
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if (err) {
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pr_err("Failed to reinsert node after eviction: start=%llx\n",
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e->node.start);
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return false;
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}
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}
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return assert_continuous(mm, nodes[0].node.size);
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}
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static int evict_something(struct drm_mm *mm,
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struct evict_node *nodes,
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unsigned int *order,
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unsigned int count,
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unsigned int size,
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unsigned int alignment,
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const struct insert_mode *mode)
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{
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LIST_HEAD(evict_list);
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struct evict_node *e;
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struct drm_mm_node tmp;
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int err;
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drm_mm_init_scan(mm, size, alignment, 0);
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if (!evict_nodes(mm,
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nodes, order, count,
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&evict_list))
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return -EINVAL;
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memset(&tmp, 0, sizeof(tmp));
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err = drm_mm_insert_node_generic(mm, &tmp, size, alignment, 0,
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mode->search_flags,
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mode->create_flags);
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if (err) {
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pr_err("Failed to insert into eviction hole: size=%d, align=%d\n",
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size, alignment);
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show_scan(mm);
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show_holes(mm, 3);
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return err;
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}
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if (!assert_node(&tmp, mm, size, alignment, 0) || tmp.hole_follows) {
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pr_err("Inserted did not fill the eviction hole: size=%lld [%d], align=%d [rem=%lld], start=%llx, hole-follows?=%d\n",
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tmp.size, size,
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alignment, misalignment(&tmp, alignment),
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tmp.start, tmp.hole_follows);
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err = -EINVAL;
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}
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drm_mm_remove_node(&tmp);
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if (err)
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return err;
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list_for_each_entry(e, &evict_list, link) {
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err = drm_mm_reserve_node(mm, &e->node);
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if (err) {
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pr_err("Failed to reinsert node after eviction: start=%llx\n",
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e->node.start);
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return err;
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}
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}
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if (!assert_continuous(mm, nodes[0].node.size)) {
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pr_err("range is no longer continuous\n");
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return -EINVAL;
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}
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return 0;
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}
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static int igt_evict(void *ignored)
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{
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DRM_RND_STATE(prng, random_seed);
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const unsigned int size = 8192;
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const struct insert_mode *mode;
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struct drm_mm mm;
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struct evict_node *nodes;
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struct drm_mm_node *node, *next;
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unsigned int *order, n;
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int ret, err;
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/* Here we populate a full drm_mm and then try and insert a new node
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* by evicting other nodes in a random order. The drm_mm_scan should
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* pick the first matching hole it finds from the random list. We
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* repeat that for different allocation strategies, alignments and
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* sizes to try and stress the hole finder.
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*/
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ret = -ENOMEM;
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nodes = vzalloc(size * sizeof(*nodes));
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if (!nodes)
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goto err;
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order = drm_random_order(size, &prng);
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if (!order)
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goto err_nodes;
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ret = -EINVAL;
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drm_mm_init(&mm, 0, size);
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for (n = 0; n < size; n++) {
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err = drm_mm_insert_node(&mm, &nodes[n].node, 1, 0,
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DRM_MM_SEARCH_DEFAULT);
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if (err) {
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pr_err("insert failed, step %d\n", n);
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ret = err;
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goto out;
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}
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}
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/* First check that using the scanner doesn't break the mm */
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if (!evict_nothing(&mm, size, nodes)) {
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pr_err("evict_nothing() failed\n");
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goto out;
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}
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if (!evict_everything(&mm, size, nodes)) {
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pr_err("evict_everything() failed\n");
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goto out;
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}
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for (mode = evict_modes; mode->name; mode++) {
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for (n = 1; n <= size; n <<= 1) {
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drm_random_reorder(order, size, &prng);
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err = evict_something(&mm,
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nodes, order, size,
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n, 1,
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mode);
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if (err) {
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pr_err("%s evict_something(size=%u) failed\n",
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mode->name, n);
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ret = err;
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goto out;
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}
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}
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for (n = 1; n < size; n <<= 1) {
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drm_random_reorder(order, size, &prng);
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err = evict_something(&mm,
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nodes, order, size,
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size/2, n,
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mode);
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if (err) {
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pr_err("%s evict_something(size=%u, alignment=%u) failed\n",
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mode->name, size/2, n);
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ret = err;
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goto out;
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}
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}
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for_each_prime_number_from(n, 1, min(size, max_prime)) {
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unsigned int nsize = (size - n + 1) / 2;
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DRM_MM_BUG_ON(!nsize);
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drm_random_reorder(order, size, &prng);
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err = evict_something(&mm,
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nodes, order, size,
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nsize, n,
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mode);
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if (err) {
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pr_err("%s evict_something(size=%u, alignment=%u) failed\n",
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mode->name, nsize, n);
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ret = err;
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goto out;
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}
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}
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}
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ret = 0;
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out:
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drm_mm_for_each_node_safe(node, next, &mm)
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drm_mm_remove_node(node);
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drm_mm_takedown(&mm);
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kfree(order);
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err_nodes:
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vfree(nodes);
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err:
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return ret;
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}
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#include "drm_selftest.c"
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#include "drm_selftest.c"
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static int __init test_drm_mm_init(void)
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static int __init test_drm_mm_init(void)
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