diff options
Diffstat (limited to 'include/drm/drm_mm.h')
| -rw-r--r-- | include/drm/drm_mm.h | 321 |
1 files changed, 251 insertions, 70 deletions
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h index 4c10be39a43..a24addfdfce 100644 --- a/include/drm/drm_mm.h +++ b/include/drm/drm_mm.h @@ -36,104 +36,285 @@ /* * Generic range manager structs */ +#include <linux/bug.h> +#include <linux/kernel.h> #include <linux/list.h> +#include <linux/spinlock.h> #ifdef CONFIG_DEBUG_FS #include <linux/seq_file.h> #endif +enum drm_mm_search_flags { + DRM_MM_SEARCH_DEFAULT = 0, + DRM_MM_SEARCH_BEST = 1 << 0, + DRM_MM_SEARCH_BELOW = 1 << 1, +}; + +enum drm_mm_allocator_flags { + DRM_MM_CREATE_DEFAULT = 0, + DRM_MM_CREATE_TOP = 1 << 0, +}; + +#define DRM_MM_BOTTOMUP DRM_MM_SEARCH_DEFAULT, DRM_MM_CREATE_DEFAULT +#define DRM_MM_TOPDOWN DRM_MM_SEARCH_BELOW, DRM_MM_CREATE_TOP + struct drm_mm_node { - struct list_head fl_entry; - struct list_head ml_entry; - int free; + struct list_head node_list; + struct list_head hole_stack; + unsigned hole_follows : 1; + unsigned scanned_block : 1; + unsigned scanned_prev_free : 1; + unsigned scanned_next_free : 1; + unsigned scanned_preceeds_hole : 1; + unsigned allocated : 1; + unsigned long color; unsigned long start; unsigned long size; struct drm_mm *mm; - void *private; }; struct drm_mm { - struct list_head fl_entry; - struct list_head ml_entry; - struct list_head unused_nodes; - int num_unused; - spinlock_t unused_lock; + /* List of all memory nodes that immediately precede a free hole. */ + struct list_head hole_stack; + /* head_node.node_list is the list of all memory nodes, ordered + * according to the (increasing) start address of the memory node. */ + struct drm_mm_node head_node; + unsigned int scan_check_range : 1; + unsigned scan_alignment; + unsigned long scan_color; + unsigned long scan_size; + unsigned long scan_hit_start; + unsigned long scan_hit_end; + unsigned scanned_blocks; + unsigned long scan_start; + unsigned long scan_end; + struct drm_mm_node *prev_scanned_node; + + void (*color_adjust)(struct drm_mm_node *node, unsigned long color, + unsigned long *start, unsigned long *end); }; -/* - * Basic range manager support (drm_mm.c) +/** + * drm_mm_node_allocated - checks whether a node is allocated + * @node: drm_mm_node to check + * + * Drivers should use this helpers for proper encapusulation of drm_mm + * internals. + * + * Returns: + * True if the @node is allocated. + */ +static inline bool drm_mm_node_allocated(struct drm_mm_node *node) +{ + return node->allocated; +} + +/** + * drm_mm_initialized - checks whether an allocator is initialized + * @mm: drm_mm to check + * + * Drivers should use this helpers for proper encapusulation of drm_mm + * internals. + * + * Returns: + * True if the @mm is initialized. */ -extern struct drm_mm_node *drm_mm_get_block_generic(struct drm_mm_node *node, - unsigned long size, - unsigned alignment, - int atomic); -extern struct drm_mm_node *drm_mm_get_block_range_generic( - struct drm_mm_node *node, - unsigned long size, - unsigned alignment, - unsigned long start, - unsigned long end, - int atomic); -static inline struct drm_mm_node *drm_mm_get_block(struct drm_mm_node *parent, - unsigned long size, - unsigned alignment) +static inline bool drm_mm_initialized(struct drm_mm *mm) { - return drm_mm_get_block_generic(parent, size, alignment, 0); + return mm->hole_stack.next; } -static inline struct drm_mm_node *drm_mm_get_block_atomic(struct drm_mm_node *parent, - unsigned long size, - unsigned alignment) + +static inline unsigned long __drm_mm_hole_node_start(struct drm_mm_node *hole_node) +{ + return hole_node->start + hole_node->size; +} + +/** + * drm_mm_hole_node_start - computes the start of the hole following @node + * @hole_node: drm_mm_node which implicitly tracks the following hole + * + * This is useful for driver-sepific debug dumpers. Otherwise drivers should not + * inspect holes themselves. Drivers must check first whether a hole indeed + * follows by looking at node->hole_follows. + * + * Returns: + * Start of the subsequent hole. + */ +static inline unsigned long drm_mm_hole_node_start(struct drm_mm_node *hole_node) { - return drm_mm_get_block_generic(parent, size, alignment, 1); + BUG_ON(!hole_node->hole_follows); + return __drm_mm_hole_node_start(hole_node); } -static inline struct drm_mm_node *drm_mm_get_block_range( - struct drm_mm_node *parent, - unsigned long size, - unsigned alignment, - unsigned long start, - unsigned long end) + +static inline unsigned long __drm_mm_hole_node_end(struct drm_mm_node *hole_node) { - return drm_mm_get_block_range_generic(parent, size, alignment, - start, end, 0); + return list_entry(hole_node->node_list.next, + struct drm_mm_node, node_list)->start; } -static inline struct drm_mm_node *drm_mm_get_block_atomic_range( - struct drm_mm_node *parent, - unsigned long size, - unsigned alignment, - unsigned long start, - unsigned long end) + +/** + * drm_mm_hole_node_end - computes the end of the hole following @node + * @hole_node: drm_mm_node which implicitly tracks the following hole + * + * This is useful for driver-sepific debug dumpers. Otherwise drivers should not + * inspect holes themselves. Drivers must check first whether a hole indeed + * follows by looking at node->hole_follows. + * + * Returns: + * End of the subsequent hole. + */ +static inline unsigned long drm_mm_hole_node_end(struct drm_mm_node *hole_node) { - return drm_mm_get_block_range_generic(parent, size, alignment, - start, end, 1); + return __drm_mm_hole_node_end(hole_node); } -extern void drm_mm_put_block(struct drm_mm_node *cur); -extern struct drm_mm_node *drm_mm_search_free(const struct drm_mm *mm, + +/** + * drm_mm_for_each_node - iterator to walk over all allocated nodes + * @entry: drm_mm_node structure to assign to in each iteration step + * @mm: drm_mm allocator to walk + * + * This iterator walks over all nodes in the range allocator. It is implemented + * with list_for_each, so not save against removal of elements. + */ +#define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \ + &(mm)->head_node.node_list, \ + node_list) + +/** + * drm_mm_for_each_hole - iterator to walk over all holes + * @entry: drm_mm_node used internally to track progress + * @mm: drm_mm allocator to walk + * @hole_start: ulong variable to assign the hole start to on each iteration + * @hole_end: ulong variable to assign the hole end to on each iteration + * + * This iterator walks over all holes in the range allocator. It is implemented + * with list_for_each, so not save against removal of elements. @entry is used + * internally and will not reflect a real drm_mm_node for the very first hole. + * Hence users of this iterator may not access it. + * + * Implementation Note: + * We need to inline list_for_each_entry in order to be able to set hole_start + * and hole_end on each iteration while keeping the macro sane. + * + * The __drm_mm_for_each_hole version is similar, but with added support for + * going backwards. + */ +#define drm_mm_for_each_hole(entry, mm, hole_start, hole_end) \ + for (entry = list_entry((mm)->hole_stack.next, struct drm_mm_node, hole_stack); \ + &entry->hole_stack != &(mm)->hole_stack ? \ + hole_start = drm_mm_hole_node_start(entry), \ + hole_end = drm_mm_hole_node_end(entry), \ + 1 : 0; \ + entry = list_entry(entry->hole_stack.next, struct drm_mm_node, hole_stack)) + +#define __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, backwards) \ + for (entry = list_entry((backwards) ? (mm)->hole_stack.prev : (mm)->hole_stack.next, struct drm_mm_node, hole_stack); \ + &entry->hole_stack != &(mm)->hole_stack ? \ + hole_start = drm_mm_hole_node_start(entry), \ + hole_end = drm_mm_hole_node_end(entry), \ + 1 : 0; \ + entry = list_entry((backwards) ? entry->hole_stack.prev : entry->hole_stack.next, struct drm_mm_node, hole_stack)) + +/* + * Basic range manager support (drm_mm.c) + */ +int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node); + +int drm_mm_insert_node_generic(struct drm_mm *mm, + struct drm_mm_node *node, + unsigned long size, + unsigned alignment, + unsigned long color, + enum drm_mm_search_flags sflags, + enum drm_mm_allocator_flags aflags); +/** + * drm_mm_insert_node - search for space and insert @node + * @mm: drm_mm to allocate from + * @node: preallocate node to insert + * @size: size of the allocation + * @alignment: alignment of the allocation + * @flags: flags to fine-tune the allocation + * + * This is a simplified version of drm_mm_insert_node_generic() with @color set + * to 0. + * + * The preallocated node must be cleared to 0. + * + * Returns: + * 0 on success, -ENOSPC if there's no suitable hole. + */ +static inline int drm_mm_insert_node(struct drm_mm *mm, + struct drm_mm_node *node, + unsigned long size, + unsigned alignment, + enum drm_mm_search_flags flags) +{ + return drm_mm_insert_node_generic(mm, node, size, alignment, 0, flags, + DRM_MM_CREATE_DEFAULT); +} + +int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, + struct drm_mm_node *node, + unsigned long size, + unsigned alignment, + unsigned long color, + unsigned long start, + unsigned long end, + enum drm_mm_search_flags sflags, + enum drm_mm_allocator_flags aflags); +/** + * drm_mm_insert_node_in_range - ranged search for space and insert @node + * @mm: drm_mm to allocate from + * @node: preallocate node to insert + * @size: size of the allocation + * @alignment: alignment of the allocation + * @start: start of the allowed range for this node + * @end: end of the allowed range for this node + * @flags: flags to fine-tune the allocation + * + * This is a simplified version of drm_mm_insert_node_in_range_generic() with + * @color set to 0. + * + * The preallocated node must be cleared to 0. + * + * Returns: + * 0 on success, -ENOSPC if there's no suitable hole. + */ +static inline int drm_mm_insert_node_in_range(struct drm_mm *mm, + struct drm_mm_node *node, unsigned long size, unsigned alignment, - int best_match); -extern struct drm_mm_node *drm_mm_search_free_in_range( - const struct drm_mm *mm, - unsigned long size, - unsigned alignment, - unsigned long start, - unsigned long end, - int best_match); -extern int drm_mm_init(struct drm_mm *mm, unsigned long start, - unsigned long size); -extern void drm_mm_takedown(struct drm_mm *mm); -extern int drm_mm_clean(struct drm_mm *mm); -extern unsigned long drm_mm_tail_space(struct drm_mm *mm); -extern int drm_mm_remove_space_from_tail(struct drm_mm *mm, - unsigned long size); -extern int drm_mm_add_space_to_tail(struct drm_mm *mm, - unsigned long size, int atomic); -extern int drm_mm_pre_get(struct drm_mm *mm); - -static inline struct drm_mm *drm_get_mm(struct drm_mm_node *block) + unsigned long start, + unsigned long end, + enum drm_mm_search_flags flags) { - return block->mm; + return drm_mm_insert_node_in_range_generic(mm, node, size, alignment, + 0, start, end, flags, + DRM_MM_CREATE_DEFAULT); } -extern void drm_mm_debug_table(struct drm_mm *mm, const char *prefix); +void drm_mm_remove_node(struct drm_mm_node *node); +void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new); +void drm_mm_init(struct drm_mm *mm, + unsigned long start, + unsigned long size); +void drm_mm_takedown(struct drm_mm *mm); +bool drm_mm_clean(struct drm_mm *mm); + +void drm_mm_init_scan(struct drm_mm *mm, + unsigned long size, + unsigned alignment, + unsigned long color); +void drm_mm_init_scan_with_range(struct drm_mm *mm, + unsigned long size, + unsigned alignment, + unsigned long color, + unsigned long start, + unsigned long end); +bool drm_mm_scan_add_block(struct drm_mm_node *node); +bool drm_mm_scan_remove_block(struct drm_mm_node *node); + +void drm_mm_debug_table(struct drm_mm *mm, const char *prefix); #ifdef CONFIG_DEBUG_FS int drm_mm_dump_table(struct seq_file *m, struct drm_mm *mm); #endif |