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246 lines
8.1 KiB
246 lines
8.1 KiB
#ifndef __DRM_VMA_MANAGER_H__ |
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#define __DRM_VMA_MANAGER_H__ |
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/* |
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* Copyright (c) 2013 David Herrmann <[email protected]> |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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*/ |
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#include <drm/drm_mm.h> |
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#include <linux/mm.h> |
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#include <linux/rbtree.h> |
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#include <linux/spinlock.h> |
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#include <linux/types.h> |
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/* We make up offsets for buffer objects so we can recognize them at |
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* mmap time. pgoff in mmap is an unsigned long, so we need to make sure |
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* that the faked up offset will fit |
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*/ |
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#if BITS_PER_LONG == 64 |
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#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) |
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#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 256) |
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#else |
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#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) |
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#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) |
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#endif |
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struct drm_file; |
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struct drm_vma_offset_file { |
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struct rb_node vm_rb; |
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struct drm_file *vm_tag; |
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unsigned long vm_count; |
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}; |
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struct drm_vma_offset_node { |
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rwlock_t vm_lock; |
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struct drm_mm_node vm_node; |
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struct rb_root vm_files; |
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void *driver_private; |
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}; |
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struct drm_vma_offset_manager { |
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rwlock_t vm_lock; |
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struct drm_mm vm_addr_space_mm; |
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}; |
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void drm_vma_offset_manager_init(struct drm_vma_offset_manager *mgr, |
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unsigned long page_offset, unsigned long size); |
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void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr); |
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struct drm_vma_offset_node *drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *mgr, |
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unsigned long start, |
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unsigned long pages); |
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int drm_vma_offset_add(struct drm_vma_offset_manager *mgr, |
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struct drm_vma_offset_node *node, unsigned long pages); |
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void drm_vma_offset_remove(struct drm_vma_offset_manager *mgr, |
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struct drm_vma_offset_node *node); |
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int drm_vma_node_allow(struct drm_vma_offset_node *node, struct drm_file *tag); |
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void drm_vma_node_revoke(struct drm_vma_offset_node *node, |
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struct drm_file *tag); |
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bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node, |
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struct drm_file *tag); |
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/** |
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* drm_vma_offset_exact_lookup_locked() - Look up node by exact address |
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* @mgr: Manager object |
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* @start: Start address (page-based, not byte-based) |
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* @pages: Size of object (page-based) |
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* |
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* Same as drm_vma_offset_lookup_locked() but does not allow any offset into the node. |
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* It only returns the exact object with the given start address. |
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* |
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* RETURNS: |
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* Node at exact start address @start. |
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*/ |
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static inline struct drm_vma_offset_node * |
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drm_vma_offset_exact_lookup_locked(struct drm_vma_offset_manager *mgr, |
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unsigned long start, |
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unsigned long pages) |
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{ |
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struct drm_vma_offset_node *node; |
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node = drm_vma_offset_lookup_locked(mgr, start, pages); |
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return (node && node->vm_node.start == start) ? node : NULL; |
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} |
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/** |
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* drm_vma_offset_lock_lookup() - Lock lookup for extended private use |
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* @mgr: Manager object |
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* |
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* Lock VMA manager for extended lookups. Only locked VMA function calls |
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* are allowed while holding this lock. All other contexts are blocked from VMA |
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* until the lock is released via drm_vma_offset_unlock_lookup(). |
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* |
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* Use this if you need to take a reference to the objects returned by |
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* drm_vma_offset_lookup_locked() before releasing this lock again. |
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* |
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* This lock must not be used for anything else than extended lookups. You must |
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* not call any other VMA helpers while holding this lock. |
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* |
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* Note: You're in atomic-context while holding this lock! |
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*/ |
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static inline void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *mgr) |
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{ |
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read_lock(&mgr->vm_lock); |
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} |
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/** |
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* drm_vma_offset_unlock_lookup() - Unlock lookup for extended private use |
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* @mgr: Manager object |
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* |
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* Release lookup-lock. See drm_vma_offset_lock_lookup() for more information. |
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*/ |
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static inline void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *mgr) |
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{ |
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read_unlock(&mgr->vm_lock); |
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} |
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/** |
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* drm_vma_node_reset() - Initialize or reset node object |
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* @node: Node to initialize or reset |
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* |
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* Reset a node to its initial state. This must be called before using it with |
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* any VMA offset manager. |
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* |
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* This must not be called on an already allocated node, or you will leak |
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* memory. |
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*/ |
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static inline void drm_vma_node_reset(struct drm_vma_offset_node *node) |
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{ |
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memset(node, 0, sizeof(*node)); |
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node->vm_files = RB_ROOT; |
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rwlock_init(&node->vm_lock); |
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} |
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/** |
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* drm_vma_node_start() - Return start address for page-based addressing |
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* @node: Node to inspect |
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* |
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* Return the start address of the given node. This can be used as offset into |
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* the linear VM space that is provided by the VMA offset manager. Note that |
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* this can only be used for page-based addressing. If you need a proper offset |
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* for user-space mappings, you must apply "<< PAGE_SHIFT" or use the |
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* drm_vma_node_offset_addr() helper instead. |
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* |
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* RETURNS: |
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* Start address of @node for page-based addressing. 0 if the node does not |
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* have an offset allocated. |
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*/ |
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static inline unsigned long drm_vma_node_start(const struct drm_vma_offset_node *node) |
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{ |
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return node->vm_node.start; |
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} |
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/** |
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* drm_vma_node_size() - Return size (page-based) |
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* @node: Node to inspect |
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* |
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* Return the size as number of pages for the given node. This is the same size |
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* that was passed to drm_vma_offset_add(). If no offset is allocated for the |
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* node, this is 0. |
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* |
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* RETURNS: |
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* Size of @node as number of pages. 0 if the node does not have an offset |
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* allocated. |
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*/ |
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static inline unsigned long drm_vma_node_size(struct drm_vma_offset_node *node) |
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{ |
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return node->vm_node.size; |
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} |
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/** |
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* drm_vma_node_offset_addr() - Return sanitized offset for user-space mmaps |
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* @node: Linked offset node |
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* |
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* Same as drm_vma_node_start() but returns the address as a valid offset that |
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* can be used for user-space mappings during mmap(). |
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* This must not be called on unlinked nodes. |
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* |
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* RETURNS: |
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* Offset of @node for byte-based addressing. 0 if the node does not have an |
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* object allocated. |
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*/ |
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static inline __u64 drm_vma_node_offset_addr(struct drm_vma_offset_node *node) |
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{ |
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return ((__u64)node->vm_node.start) << PAGE_SHIFT; |
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} |
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/** |
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* drm_vma_node_unmap() - Unmap offset node |
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* @node: Offset node |
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* @file_mapping: Address space to unmap @node from |
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* |
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* Unmap all userspace mappings for a given offset node. The mappings must be |
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* associated with the @file_mapping address-space. If no offset exists |
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* nothing is done. |
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* |
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* This call is unlocked. The caller must guarantee that drm_vma_offset_remove() |
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* is not called on this node concurrently. |
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*/ |
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static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node, |
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struct address_space *file_mapping) |
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{ |
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if (drm_mm_node_allocated(&node->vm_node)) |
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unmap_mapping_range(file_mapping, |
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drm_vma_node_offset_addr(node), |
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drm_vma_node_size(node) << PAGE_SHIFT, 1); |
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} |
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/** |
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* drm_vma_node_verify_access() - Access verification helper for TTM |
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* @node: Offset node |
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* @tag: Tag of file to check |
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* |
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* This checks whether @tag is granted access to @node. It is the same as |
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* drm_vma_node_is_allowed() but suitable as drop-in helper for TTM |
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* verify_access() callbacks. |
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* |
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* RETURNS: |
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* 0 if access is granted, -EACCES otherwise. |
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*/ |
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static inline int drm_vma_node_verify_access(struct drm_vma_offset_node *node, |
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struct drm_file *tag) |
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{ |
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return drm_vma_node_is_allowed(node, tag) ? 0 : -EACCES; |
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} |
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#endif /* __DRM_VMA_MANAGER_H__ */
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