/************************************************************************** * * Copyright 2006-2008 Tungsten Graphics, Inc., Cedar Park, TX. USA. * Copyright 2016 Intel Corporation * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * * **************************************************************************/ /* * Authors: * Thomas Hellstrom */ #ifndef _DRM_MM_H_ #define _DRM_MM_H_ /* * Generic range manager structs */ #include #include #include #include #include #ifdef CONFIG_DEBUG_FS #include #endif #ifdef CONFIG_DRM_DEBUG_MM #include #endif #ifdef CONFIG_DRM_DEBUG_MM #define DRM_MM_BUG_ON(expr) BUG_ON(expr) #else #define DRM_MM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr) #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 node_list; struct list_head hole_stack; struct rb_node rb; 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; u64 start; u64 size; u64 __subtree_last; struct drm_mm *mm; #ifdef CONFIG_DRM_DEBUG_MM depot_stack_handle_t stack; #endif }; struct drm_mm { /* 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; /* 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); }; /** * drm_mm_node_allocated - checks whether a node is allocated * @node: drm_mm_node to check * * Drivers are required to clear a node prior to using it with the * drm_mm range manager. * * Drivers should use this helper for proper encapsulation of drm_mm * internals. * * Returns: * True if the @node is allocated. */ static inline bool drm_mm_node_allocated(const struct drm_mm_node *node) { return node->allocated; } /** * drm_mm_initialized - checks whether an allocator is initialized * @mm: drm_mm to check * * Drivers should clear the struct drm_mm prior to initialisation if they * want to use this function. * * Drivers should use this helper for proper encapsulation of drm_mm * internals. * * Returns: * True if the @mm is initialized. */ static inline bool drm_mm_initialized(const struct drm_mm *mm) { return mm->hole_stack.next; } static inline u64 __drm_mm_hole_node_start(const 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-specific 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 u64 drm_mm_hole_node_start(const struct drm_mm_node *hole_node) { DRM_MM_BUG_ON(!hole_node->hole_follows); return __drm_mm_hole_node_start(hole_node); } static inline u64 __drm_mm_hole_node_end(const struct drm_mm_node *hole_node) { return list_next_entry(hole_node, node_list)->start; } /** * 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-specific 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 u64 drm_mm_hole_node_end(const struct drm_mm_node *hole_node) { return __drm_mm_hole_node_end(hole_node); } /** * drm_mm_nodes - list of nodes under the drm_mm range manager * @mm: the struct drm_mm range manger * * As the drm_mm range manager hides its node_list deep with its * structure, extracting it looks painful and repetitive. This is * not expected to be used outside of the drm_mm_for_each_node() * macros and similar internal functions. * * Returns: * The node list, may be empty. */ #define drm_mm_nodes(mm) (&(mm)->head_node.node_list) /** * 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, drm_mm_nodes(mm), node_list) /** * drm_mm_for_each_node_safe - iterator to walk over all allocated nodes * @entry: drm_mm_node structure to assign to in each iteration step * @next: drm_mm_node structure to store the next step * @mm: drm_mm allocator to walk * * This iterator walks over all nodes in the range allocator. It is implemented * with list_for_each_safe, so save against removal of elements. */ #define drm_mm_for_each_node_safe(entry, next, mm) \ list_for_each_entry_safe(entry, next, drm_mm_nodes(mm), node_list) #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)) /** * 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) \ __drm_mm_for_each_hole(entry, mm, hole_start, hole_end, 0) /* * 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, u64 size, u64 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, u64 size, u64 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, u64 size, u64 alignment, unsigned long color, u64 start, u64 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, u64 size, u64 alignment, u64 start, u64 end, enum drm_mm_search_flags flags) { return drm_mm_insert_node_in_range_generic(mm, node, size, alignment, 0, start, end, flags, DRM_MM_CREATE_DEFAULT); } 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, u64 start, u64 size); void drm_mm_takedown(struct drm_mm *mm); /** * drm_mm_clean - checks whether an allocator is clean * @mm: drm_mm allocator to check * * Returns: * True if the allocator is completely free, false if there's still a node * allocated in it. */ static inline bool drm_mm_clean(const struct drm_mm *mm) { return list_empty(drm_mm_nodes(mm)); } struct drm_mm_node * __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last); /** * drm_mm_for_each_node_in_range - iterator to walk over a range of * allocated nodes * @node__: drm_mm_node structure to assign to in each iteration step * @mm__: drm_mm allocator to walk * @start__: starting offset, the first node will overlap this * @end__: ending offset, the last node will start before this (but may overlap) * * This iterator walks over all nodes in the range allocator that lie * between @start and @end. It is implemented similarly to list_for_each(), * but using the internal interval tree to accelerate the search for the * starting node, and so not safe against removal of elements. It assumes * that @end is within (or is the upper limit of) the drm_mm allocator. */ #define drm_mm_for_each_node_in_range(node__, mm__, start__, end__) \ for (node__ = __drm_mm_interval_first((mm__), (start__), (end__)-1); \ node__ && node__->start < (end__); \ node__ = list_next_entry(node__, node_list)) void drm_mm_init_scan(struct drm_mm *mm, u64 size, u64 alignment, unsigned long color); void drm_mm_init_scan_with_range(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); void drm_mm_debug_table(const struct drm_mm *mm, const char *prefix); #ifdef CONFIG_DEBUG_FS int drm_mm_dump_table(struct seq_file *m, const struct drm_mm *mm); #endif #endif