The scan state occupies a large proportion of the struct drm_mm and is rarely used and only contains temporary state. That makes it suitable to moving to its struct and onto the stack of the callers.
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com --- drivers/gpu/drm/drm_mm.c | 124 ++++++++++++++++++-------------- drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 7 +- drivers/gpu/drm/i915/i915_gem_evict.c | 19 +++-- drivers/gpu/drm/selftests/test-drm_mm.c | 45 ++++++------ include/drm/drm_mm.h | 43 +++++++---- 5 files changed, 138 insertions(+), 100 deletions(-)
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index b80305484124..21bd2e13738b 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -574,7 +574,7 @@ static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm, u64 adj_end; u64 best_size;
- DRM_MM_BUG_ON(mm->scanned_blocks); + DRM_MM_BUG_ON(mm->scan_active);
best = NULL; best_size = ~0UL; @@ -618,7 +618,7 @@ static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_ u64 adj_end; u64 best_size;
- DRM_MM_BUG_ON(mm->scanned_blocks); + DRM_MM_BUG_ON(mm->scan_active);
best = NULL; best_size = ~0UL; @@ -693,7 +693,7 @@ EXPORT_SYMBOL(drm_mm_replace_node); * * The DRM range allocator supports this use-case through the scanning * interfaces. First a scan operation needs to be initialized with - * drm_mm_init_scan() or drm_mm_init_scan_with_range(). The driver adds + * drm_mm_scan_init() or drm_mm_scan_init_with_range(). The driver adds * objects to the roaster (probably by walking an LRU list, but this can be * freely implemented) until a suitable hole is found or there's no further * evictable object. @@ -710,7 +710,8 @@ EXPORT_SYMBOL(drm_mm_replace_node); */
/** - * drm_mm_init_scan - initialize lru scanning + * drm_mm_scan_init - initialize lru scanning + * @scan: scan state * @mm: drm_mm to scan * @size: size of the allocation * @alignment: alignment of the allocation @@ -724,26 +725,33 @@ EXPORT_SYMBOL(drm_mm_replace_node); * As long as the scan list is non-empty, no other operations than * adding/removing nodes to/from the scan list are allowed. */ -void drm_mm_init_scan(struct drm_mm *mm, +void drm_mm_scan_init(struct drm_mm_scan *scan, + struct drm_mm *mm, u64 size, u64 alignment, unsigned long color) { DRM_MM_BUG_ON(!size); + DRM_MM_BUG_ON(mm->scan_active);
- mm->scan_color = color; - mm->scan_alignment = alignment; - mm->scan_size = size; - mm->scanned_blocks = 0; - mm->scan_hit_start = 0; - mm->scan_hit_end = 0; - mm->scan_check_range = 0; - mm->prev_scanned_node = NULL; + scan->mm = mm; + + scan->color = color; + scan->alignment = alignment; + scan->size = size; + + scan->check_range = 0; + + scan->hit_start = U64_MAX; + scan->hit_end = 0; + + scan->prev_scanned_node = NULL; } -EXPORT_SYMBOL(drm_mm_init_scan); +EXPORT_SYMBOL(drm_mm_scan_init);
/** - * drm_mm_init_scan - initialize range-restricted lru scanning + * drm_mm_scan_init_with_range - initialize range-restricted lru scanning + * @scan: scan state * @mm: drm_mm to scan * @size: size of the allocation * @alignment: alignment of the allocation @@ -759,7 +767,8 @@ EXPORT_SYMBOL(drm_mm_init_scan); * As long as the scan list is non-empty, no other operations than * adding/removing nodes to/from the scan list are allowed. */ -void drm_mm_init_scan_with_range(struct drm_mm *mm, +void drm_mm_scan_init_with_range(struct drm_mm_scan *scan, + struct drm_mm *mm, u64 size, u64 alignment, unsigned long color, @@ -768,19 +777,25 @@ void drm_mm_init_scan_with_range(struct drm_mm *mm, { DRM_MM_BUG_ON(start >= end); DRM_MM_BUG_ON(!size || size > end - start); + DRM_MM_BUG_ON(mm->scan_active); + + scan->mm = mm; + + scan->color = color; + scan->alignment = alignment; + scan->size = size; + + DRM_MM_BUG_ON(end <= start); + scan->range_start = start; + scan->range_end = end; + scan->check_range = 1;
- mm->scan_color = color; - mm->scan_alignment = alignment; - mm->scan_size = size; - mm->scanned_blocks = 0; - mm->scan_hit_start = 0; - mm->scan_hit_end = 0; - mm->scan_start = start; - mm->scan_end = end; - mm->scan_check_range = 1; - mm->prev_scanned_node = NULL; + scan->hit_start = U64_MAX; + scan->hit_end = 0; + + scan->prev_scanned_node = NULL; } -EXPORT_SYMBOL(drm_mm_init_scan_with_range); +EXPORT_SYMBOL(drm_mm_scan_init_with_range);
/** * drm_mm_scan_add_block - add a node to the scan list @@ -792,46 +807,46 @@ EXPORT_SYMBOL(drm_mm_init_scan_with_range); * Returns: * True if a hole has been found, false otherwise. */ -bool drm_mm_scan_add_block(struct drm_mm_node *node) +bool drm_mm_scan_add_block(struct drm_mm_scan *scan, + struct drm_mm_node *node) { - struct drm_mm *mm = node->mm; + struct drm_mm *mm = scan->mm; struct drm_mm_node *prev_node; u64 hole_start, hole_end; u64 adj_start, adj_end;
- mm->scanned_blocks++; - + DRM_MM_BUG_ON(node->mm != mm); + DRM_MM_BUG_ON(!node->allocated); DRM_MM_BUG_ON(node->scanned_block); node->scanned_block = 1; + mm->scan_active++;
- prev_node = list_entry(node->node_list.prev, struct drm_mm_node, - node_list); + prev_node = list_prev_entry(node, node_list);
node->scanned_preceeds_hole = prev_node->hole_follows; prev_node->hole_follows = 1; list_del(&node->node_list); node->node_list.prev = &prev_node->node_list; - node->node_list.next = &mm->prev_scanned_node->node_list; - mm->prev_scanned_node = node; + node->node_list.next = &scan->prev_scanned_node->node_list; + scan->prev_scanned_node = node;
adj_start = hole_start = drm_mm_hole_node_start(prev_node); adj_end = hole_end = drm_mm_hole_node_end(prev_node);
- if (mm->scan_check_range) { - if (adj_start < mm->scan_start) - adj_start = mm->scan_start; - if (adj_end > mm->scan_end) - adj_end = mm->scan_end; + if (scan->check_range) { + if (adj_start < scan->range_start) + adj_start = scan->range_start; + if (adj_end > scan->range_end) + adj_end = scan->range_end; }
if (mm->color_adjust) - mm->color_adjust(prev_node, mm->scan_color, - &adj_start, &adj_end); + mm->color_adjust(prev_node, scan->color, &adj_start, &adj_end);
if (check_free_hole(adj_start, adj_end, - mm->scan_size, mm->scan_alignment)) { - mm->scan_hit_start = hole_start; - mm->scan_hit_end = hole_end; + scan->size, scan->alignment)) { + scan->hit_start = hole_start; + scan->hit_end = hole_end; return true; }
@@ -856,24 +871,25 @@ EXPORT_SYMBOL(drm_mm_scan_add_block); * True if this block should be evicted, false otherwise. Will always * return false when no hole has been found. */ -bool drm_mm_scan_remove_block(struct drm_mm_node *node) +bool drm_mm_scan_remove_block(struct drm_mm_scan *scan, + struct drm_mm_node *node) { - struct drm_mm *mm = node->mm; struct drm_mm_node *prev_node;
- mm->scanned_blocks--; - + DRM_MM_BUG_ON(node->mm != scan->mm); DRM_MM_BUG_ON(!node->scanned_block); node->scanned_block = 0;
- prev_node = list_entry(node->node_list.prev, struct drm_mm_node, - node_list); + DRM_MM_BUG_ON(!node->mm->scan_active); + node->mm->scan_active--; + + prev_node = list_prev_entry(node, node_list);
prev_node->hole_follows = node->scanned_preceeds_hole; list_add(&node->node_list, &prev_node->node_list);
- return (drm_mm_hole_node_end(node) > mm->scan_hit_start && - node->start < mm->scan_hit_end); + return (drm_mm_hole_node_end(node) > scan->hit_start && + node->start < scan->hit_end); } EXPORT_SYMBOL(drm_mm_scan_remove_block);
@@ -890,7 +906,7 @@ void drm_mm_init(struct drm_mm *mm, u64 start, u64 size) DRM_MM_BUG_ON(start + size <= start);
INIT_LIST_HEAD(&mm->hole_stack); - mm->scanned_blocks = 0; + mm->scan_active = 0;
/* Clever trick to avoid a special case in the free hole tracking. */ INIT_LIST_HEAD(&mm->head_node.node_list); diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c index 169ac96e8f08..fe1e886dcabb 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -113,6 +113,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
while (1) { struct etnaviv_vram_mapping *m, *n; + struct drm_mm_scan scan; struct list_head list; bool found;
@@ -134,7 +135,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu, }
/* Try to retire some entries */ - drm_mm_init_scan(&mmu->mm, size, 0, 0); + drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0);
found = 0; INIT_LIST_HEAD(&list); @@ -151,7 +152,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu, continue;
list_add(&free->scan_node, &list); - if (drm_mm_scan_add_block(&free->vram_node)) { + if (drm_mm_scan_add_block(&scan, &free->vram_node)) { found = true; break; } @@ -171,7 +172,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu, * can leave the block pinned. */ list_for_each_entry_safe(m, n, &list, scan_node) - if (!drm_mm_scan_remove_block(&m->vram_node)) + if (!drm_mm_scan_remove_block(&scan, &m->vram_node)) list_del_init(&m->scan_node);
/* diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c index 6457fd0c33a8..6db0d73c0aa7 100644 --- a/drivers/gpu/drm/i915/i915_gem_evict.c +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -51,7 +51,10 @@ static bool ggtt_is_idle(struct drm_i915_private *dev_priv) }
static bool -mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind) +mark_free(struct drm_mm_scan *scan, + struct i915_vma *vma, + unsigned int flags, + struct list_head *unwind) { if (i915_vma_is_pinned(vma)) return false; @@ -63,7 +66,7 @@ mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind) return false;
list_add(&vma->exec_list, unwind); - return drm_mm_scan_add_block(&vma->node); + return drm_mm_scan_add_block(scan, &vma->node); }
/** @@ -97,6 +100,7 @@ i915_gem_evict_something(struct i915_address_space *vm, unsigned flags) { struct drm_i915_private *dev_priv = vm->i915; + struct drm_mm_scan scan; struct list_head eviction_list; struct list_head *phases[] = { &vm->inactive_list, @@ -123,11 +127,12 @@ i915_gem_evict_something(struct i915_address_space *vm, * object on the TAIL. */ if (start != 0 || end != vm->total) { - drm_mm_init_scan_with_range(&vm->mm, min_size, + drm_mm_scan_init_with_range(&scan, &vm->mm, min_size, alignment, cache_level, start, end); } else - drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); + drm_mm_scan_init(&scan, &vm->mm, min_size, + alignment, cache_level);
/* Retire before we search the active list. Although we have * reasonable accuracy in our retirement lists, we may have @@ -144,13 +149,13 @@ i915_gem_evict_something(struct i915_address_space *vm, phase = phases; do { list_for_each_entry(vma, *phase, vm_link) - if (mark_free(vma, flags, &eviction_list)) + if (mark_free(&scan, vma, flags, &eviction_list)) goto found; } while (*++phase);
/* Nothing found, clean up and bail out! */ list_for_each_entry_safe(vma, next, &eviction_list, exec_list) { - ret = drm_mm_scan_remove_block(&vma->node); + ret = drm_mm_scan_remove_block(&scan, &vma->node); BUG_ON(ret);
INIT_LIST_HEAD(&vma->exec_list); @@ -199,7 +204,7 @@ i915_gem_evict_something(struct i915_address_space *vm, * of any of our objects, thus corrupting the list). */ list_for_each_entry_safe(vma, next, &eviction_list, exec_list) { - if (drm_mm_scan_remove_block(&vma->node)) + if (drm_mm_scan_remove_block(&scan, &vma->node)) __i915_vma_pin(vma); else list_del_init(&vma->exec_list); diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c index e2ed9efb361c..997f2bc93b9b 100644 --- a/drivers/gpu/drm/selftests/test-drm_mm.c +++ b/drivers/gpu/drm/selftests/test-drm_mm.c @@ -1114,11 +1114,11 @@ static int igt_align64(void *ignored) return igt_align_pot(64); }
-static void show_scan(const struct drm_mm *scan) +static void show_scan(const struct drm_mm_scan *scan) { pr_info("scan: hit [%llx, %llx], size=%lld, align=%lld, color=%ld\n", - scan->scan_hit_start, scan->scan_hit_end, - scan->scan_size, scan->scan_alignment, scan->scan_color); + scan->hit_start, scan->hit_end, + scan->size, scan->alignment, scan->color); }
static void show_holes(const struct drm_mm *mm, int count) @@ -1158,7 +1158,7 @@ struct evict_node { struct list_head link; };
-static bool evict_nodes(struct drm_mm *mm, +static bool evict_nodes(struct drm_mm_scan *scan, struct evict_node *nodes, unsigned int *order, unsigned int count, @@ -1170,18 +1170,16 @@ static bool evict_nodes(struct drm_mm *mm, for (i = 0; i < count; i++) { e = &nodes[order ? order[i] : i]; list_add(&e->link, evict_list); - if (drm_mm_scan_add_block(&e->node)) + if (drm_mm_scan_add_block(scan, &e->node)) break; } list_for_each_entry_safe(e, en, evict_list, link) { - if (!drm_mm_scan_remove_block(&e->node)) + if (!drm_mm_scan_remove_block(scan, &e->node)) list_del(&e->link); } if (list_empty(evict_list)) { pr_err("Failed to find eviction: size=%lld [avail=%d], align=%lld (color=%lu)\n", - mm->scan_size, count, - mm->scan_alignment, - mm->scan_color); + scan->size, count, scan->alignment, scan->color); return false; }
@@ -1195,19 +1193,20 @@ static bool evict_nothing(struct drm_mm *mm, unsigned int total_size, struct evict_node *nodes) { + struct drm_mm_scan scan; LIST_HEAD(evict_list); struct evict_node *e; struct drm_mm_node *node; unsigned int n;
- drm_mm_init_scan(mm, 1, 0, 0); + drm_mm_scan_init(&scan, mm, 1, 0, 0); for (n = 0; n < total_size; n++) { e = &nodes[n]; list_add(&e->link, &evict_list); - drm_mm_scan_add_block(&e->node); + drm_mm_scan_add_block(&scan, &e->node); } list_for_each_entry(e, &evict_list, link) - drm_mm_scan_remove_block(&e->node); + drm_mm_scan_remove_block(&scan, &e->node);
for (n = 0; n < total_size; n++) { e = &nodes[n]; @@ -1241,19 +1240,21 @@ static bool evict_everything(struct drm_mm *mm, unsigned int total_size, struct evict_node *nodes) { + struct drm_mm_scan scan; LIST_HEAD(evict_list); struct evict_node *e; unsigned int n; int err;
- drm_mm_init_scan(mm, total_size, 0, 0); + drm_mm_scan_init(&scan, mm, total_size, 0, 0); for (n = 0; n < total_size; n++) { e = &nodes[n]; list_add(&e->link, &evict_list); - drm_mm_scan_add_block(&e->node); + if (drm_mm_scan_add_block(&scan, &e->node)) + break; } list_for_each_entry(e, &evict_list, link) { - if (!drm_mm_scan_remove_block(&e->node)) { + if (!drm_mm_scan_remove_block(&scan, &e->node)) { pr_err("Node %lld not marked for eviction!\n", e->node.start); list_del(&e->link); @@ -1287,15 +1288,16 @@ static int evict_something(struct drm_mm *mm, unsigned int alignment, const struct insert_mode *mode) { + struct drm_mm_scan scan; LIST_HEAD(evict_list); struct evict_node *e; struct drm_mm_node tmp; int err;
- drm_mm_init_scan_with_range(mm, + drm_mm_scan_init_with_range(&scan, mm, size, alignment, 0, range_start, range_end); - if (!evict_nodes(mm, + if (!evict_nodes(&scan, nodes, order, count, &evict_list)) return -EINVAL; @@ -1307,7 +1309,7 @@ static int evict_something(struct drm_mm *mm, if (err) { pr_err("Failed to insert into eviction hole: size=%d, align=%d\n", size, alignment); - show_scan(mm); + show_scan(&scan); show_holes(mm, 3); return err; } @@ -1864,15 +1866,16 @@ static int evict_color(struct drm_mm *mm, unsigned long color, const struct insert_mode *mode) { + struct drm_mm_scan scan; LIST_HEAD(evict_list); struct evict_node *e; struct drm_mm_node tmp; int err;
- drm_mm_init_scan_with_range(mm, + drm_mm_scan_init_with_range(&scan, mm, size, alignment, color, range_start, range_end); - if (!evict_nodes(mm, + if (!evict_nodes(&scan, nodes, order, count, &evict_list)) return -EINVAL; @@ -1884,7 +1887,7 @@ static int evict_color(struct drm_mm *mm, if (err) { pr_err("Failed to insert into eviction hole: size=%d, align=%d, color=%lu, err=%d\n", size, alignment, color, err); - show_scan(mm); + show_scan(&scan); show_holes(mm, 3); return err; } diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h index 72e0c0ddf8d0..fcad718c5fb4 100644 --- a/include/drm/drm_mm.h +++ b/include/drm/drm_mm.h @@ -98,20 +98,29 @@ struct drm_mm { /* Keep an interval_tree for fast lookup of drm_mm_nodes by address. */ struct rb_root interval_tree;
- unsigned int scan_check_range : 1; - unsigned int scanned_blocks; - unsigned long scan_color; - u64 scan_alignment; - u64 scan_size; - u64 scan_hit_start; - u64 scan_hit_end; - u64 scan_start; - u64 scan_end; - struct drm_mm_node *prev_scanned_node; - void (*color_adjust)(const struct drm_mm_node *node, unsigned long color, u64 *start, u64 *end); + + unsigned long scan_active; +}; + +struct drm_mm_scan { + struct drm_mm *mm; + + u64 size; + u64 alignment; + + u64 range_start; + u64 range_end; + + u64 hit_start; + u64 hit_end; + + struct drm_mm_node *prev_scanned_node; + + unsigned long color; + bool check_range : 1; };
/** @@ -378,18 +387,22 @@ __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last); node__ && node__->start < (end__); \ node__ = list_next_entry(node__, node_list))
-void drm_mm_init_scan(struct drm_mm *mm, +void drm_mm_scan_init(struct drm_mm_scan *scan, + struct drm_mm *mm, u64 size, u64 alignment, unsigned long color); -void drm_mm_init_scan_with_range(struct drm_mm *mm, +void drm_mm_scan_init_with_range(struct drm_mm_scan *scan, + struct drm_mm *mm, u64 size, u64 alignment, unsigned long color, u64 start, u64 end); -bool drm_mm_scan_add_block(struct drm_mm_node *node); -bool drm_mm_scan_remove_block(struct drm_mm_node *node); +bool drm_mm_scan_add_block(struct drm_mm_scan *scan, + struct drm_mm_node *node); +bool drm_mm_scan_remove_block(struct drm_mm_scan *scan, + struct drm_mm_node *node);
void drm_mm_debug_table(const struct drm_mm *mm, const char *prefix); #ifdef CONFIG_DEBUG_FS