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drm/mm: Convert drm_mm_node booleans to bitops 

A straightforward conversion of assignment and checking of the boolean
state flags (allocated, scanned) into non-atomic bitops. The caller
remains responsible for all locking around the drm_mm and its nodes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191003210100.22250-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-03 22:00:59 +01:00
parent 71724f7089
commit 4ee92c7149
4 changed files with 16 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/gpu/drm/drm_mm.c
View File

@ -426,7 +426,7 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
list_add(&node->node_list, &hole->node_list);
drm_mm_interval_tree_add_node(hole, node);
node->allocated = true;
__set_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
node->hole_size = 0;
rm_hole(hole);
@ -545,7 +545,7 @@ int drm_mm_insert_node_in_range(struct drm_mm * const mm,
list_add(&node->node_list, &hole->node_list);
drm_mm_interval_tree_add_node(hole, node);
node->allocated = true;
__set_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
rm_hole(hole);
if (adj_start > hole_start)
@ -563,7 +563,7 @@ EXPORT_SYMBOL(drm_mm_insert_node_in_range);
static inline bool drm_mm_node_scanned_block(const struct drm_mm_node *node)
{
return node->scanned_block;
return test_bit(DRM_MM_NODE_SCANNED_BIT, &node->flags);
}
/**
@ -589,7 +589,7 @@ void drm_mm_remove_node(struct drm_mm_node *node)
drm_mm_interval_tree_remove(node, &mm->interval_tree);
list_del(&node->node_list);
node->allocated = false;
__clear_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
if (drm_mm_hole_follows(prev_node))
rm_hole(prev_node);
@ -627,8 +627,8 @@ void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
&mm->holes_addr);
}
old->allocated = false;
new->allocated = true;
__clear_bit(DRM_MM_NODE_ALLOCATED_BIT, &old->flags);
__set_bit(DRM_MM_NODE_ALLOCATED_BIT, &new->flags);
}
EXPORT_SYMBOL(drm_mm_replace_node);
@ -738,7 +738,7 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
DRM_MM_BUG_ON(node->mm != mm);
DRM_MM_BUG_ON(!drm_mm_node_allocated(node));
DRM_MM_BUG_ON(drm_mm_node_scanned_block(node));
node->scanned_block = true;
__set_bit(DRM_MM_NODE_SCANNED_BIT, &node->flags);
mm->scan_active++;
/* Remove this block from the node_list so that we enlarge the hole
@ -824,7 +824,7 @@ bool drm_mm_scan_remove_block(struct drm_mm_scan *scan,
DRM_MM_BUG_ON(node->mm != scan->mm);
DRM_MM_BUG_ON(!drm_mm_node_scanned_block(node));
node->scanned_block = false;
__clear_bit(DRM_MM_NODE_SCANNED_BIT, &node->flags);
DRM_MM_BUG_ON(!node->mm->scan_active);
node->mm->scan_active--;
@ -922,7 +922,7 @@ void drm_mm_init(struct drm_mm *mm, u64 start, u64 size)
/* Clever trick to avoid a special case in the free hole tracking. */
INIT_LIST_HEAD(&mm->head_node.node_list);
mm->head_node.allocated = false;
mm->head_node.flags = 0;
mm->head_node.mm = mm;
mm->head_node.start = start + size;
mm->head_node.size = -size;

2
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -902,7 +902,7 @@ static void reloc_cache_init(struct reloc_cache *cache,
cache->use_64bit_reloc = HAS_64BIT_RELOC(i915);
cache->has_fence = cache->gen < 4;
cache->needs_unfenced = INTEL_INFO(i915)->unfenced_needs_alignment;
cache->node.allocated = false;
cache->node.flags = 0;
cache->rq = NULL;
cache->rq_size = 0;
}

4
drivers/gpu/drm/i915/i915_gem.c
View File

@ -351,7 +351,7 @@ i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
PIN_NOEVICT);
if (!IS_ERR(vma)) {
node.start = i915_ggtt_offset(vma);
node.allocated = false;
node.flags = 0;
} else {
ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
if (ret)
@ -561,7 +561,7 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
PIN_NOEVICT);
if (!IS_ERR(vma)) {
node.start = i915_ggtt_offset(vma);
node.allocated = false;
node.flags = 0;
} else {
ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
if (ret)

7
include/drm/drm_mm.h
View File

@ -168,8 +168,9 @@ struct drm_mm_node {
struct rb_node rb_hole_addr;
u64 __subtree_last;
u64 hole_size;
bool allocated : 1;
bool scanned_block : 1;
unsigned long flags;
#define DRM_MM_NODE_ALLOCATED_BIT 0
#define DRM_MM_NODE_SCANNED_BIT 1
#ifdef CONFIG_DRM_DEBUG_MM
depot_stack_handle_t stack;
#endif
@ -253,7 +254,7 @@ struct drm_mm_scan {
*/
static inline bool drm_mm_node_allocated(const struct drm_mm_node *node)
{
return node->allocated;
return test_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
}
/**