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Release 4.12 include/drm/drm_vma_manager.h

Directory: include/drm
#ifndef __DRM_VMA_MANAGER_H__

#define __DRM_VMA_MANAGER_H__

/*
 * Copyright (c) 2013 David Herrmann <dh.herrmann@gmail.com>
 *
 * 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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 */

#include <drm/drm_mm.h>
#include <linux/mm.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/types.h>

struct drm_file;


struct drm_vma_offset_file {
	
struct rb_node vm_rb;
	
struct drm_file *vm_tag;
	
unsigned long vm_count;
};


struct drm_vma_offset_node {
	
rwlock_t vm_lock;
	
struct drm_mm_node vm_node;
	
struct rb_root vm_files;
};


struct drm_vma_offset_manager {
	
rwlock_t vm_lock;
	
struct drm_mm vm_addr_space_mm;
};

void drm_vma_offset_manager_init(struct drm_vma_offset_manager *mgr,
				 unsigned long page_offset, unsigned long size);
void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr);

struct drm_vma_offset_node *drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *mgr,
							   unsigned long start,
							   unsigned long pages);
int drm_vma_offset_add(struct drm_vma_offset_manager *mgr,
		       struct drm_vma_offset_node *node, unsigned long pages);
void drm_vma_offset_remove(struct drm_vma_offset_manager *mgr,
			   struct drm_vma_offset_node *node);

int drm_vma_node_allow(struct drm_vma_offset_node *node, struct drm_file *tag);
void drm_vma_node_revoke(struct drm_vma_offset_node *node,
			 struct drm_file *tag);
bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node,
			     struct drm_file *tag);

/**
 * drm_vma_offset_exact_lookup_locked() - Look up node by exact address
 * @mgr: Manager object
 * @start: Start address (page-based, not byte-based)
 * @pages: Size of object (page-based)
 *
 * Same as drm_vma_offset_lookup_locked() but does not allow any offset into the node.
 * It only returns the exact object with the given start address.
 *
 * RETURNS:
 * Node at exact start address @start.
 */

static inline struct drm_vma_offset_node * drm_vma_offset_exact_lookup_locked(struct drm_vma_offset_manager *mgr, unsigned long start, unsigned long pages) { struct drm_vma_offset_node *node; node = drm_vma_offset_lookup_locked(mgr, start, pages); return (node && node->vm_node.start == start) ? node : NULL; }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann5396.36%150.00%
Daniel Vetter23.64%150.00%
Total55100.00%2100.00%

/** * drm_vma_offset_lock_lookup() - Lock lookup for extended private use * @mgr: Manager object * * Lock VMA manager for extended lookups. Only locked VMA function calls * are allowed while holding this lock. All other contexts are blocked from VMA * until the lock is released via drm_vma_offset_unlock_lookup(). * * Use this if you need to take a reference to the objects returned by * drm_vma_offset_lookup_locked() before releasing this lock again. * * This lock must not be used for anything else than extended lookups. You must * not call any other VMA helpers while holding this lock. * * Note: You're in atomic-context while holding this lock! */
static inline void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *mgr) { read_lock(&mgr->vm_lock); }

Contributors

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David Herrmann20100.00%1100.00%
Total20100.00%1100.00%

/** * drm_vma_offset_unlock_lookup() - Unlock lookup for extended private use * @mgr: Manager object * * Release lookup-lock. See drm_vma_offset_lock_lookup() for more information. */
static inline void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *mgr) { read_unlock(&mgr->vm_lock); }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann20100.00%1100.00%
Total20100.00%1100.00%

/** * drm_vma_node_reset() - Initialize or reset node object * @node: Node to initialize or reset * * Reset a node to its initial state. This must be called before using it with * any VMA offset manager. * * This must not be called on an already allocated node, or you will leak * memory. */
static inline void drm_vma_node_reset(struct drm_vma_offset_node *node) { memset(node, 0, sizeof(*node)); node->vm_files = RB_ROOT; rwlock_init(&node->vm_lock); }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann39100.00%2100.00%
Total39100.00%2100.00%

/** * drm_vma_node_start() - Return start address for page-based addressing * @node: Node to inspect * * Return the start address of the given node. This can be used as offset into * the linear VM space that is provided by the VMA offset manager. Note that * this can only be used for page-based addressing. If you need a proper offset * for user-space mappings, you must apply "<< PAGE_SHIFT" or use the * drm_vma_node_offset_addr() helper instead. * * RETURNS: * Start address of @node for page-based addressing. 0 if the node does not * have an offset allocated. */
static inline unsigned long drm_vma_node_start(struct drm_vma_offset_node *node) { return node->vm_node.start; }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann20100.00%1100.00%
Total20100.00%1100.00%

/** * drm_vma_node_size() - Return size (page-based) * @node: Node to inspect * * Return the size as number of pages for the given node. This is the same size * that was passed to drm_vma_offset_add(). If no offset is allocated for the * node, this is 0. * * RETURNS: * Size of @node as number of pages. 0 if the node does not have an offset * allocated. */
static inline unsigned long drm_vma_node_size(struct drm_vma_offset_node *node) { return node->vm_node.size; }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann20100.00%1100.00%
Total20100.00%1100.00%

/** * drm_vma_node_offset_addr() - Return sanitized offset for user-space mmaps * @node: Linked offset node * * Same as drm_vma_node_start() but returns the address as a valid offset that * can be used for user-space mappings during mmap(). * This must not be called on unlinked nodes. * * RETURNS: * Offset of @node for byte-based addressing. 0 if the node does not have an * object allocated. */
static inline __u64 drm_vma_node_offset_addr(struct drm_vma_offset_node *node) { return ((__u64)node->vm_node.start) << PAGE_SHIFT; }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann26100.00%1100.00%
Total26100.00%1100.00%

/** * drm_vma_node_unmap() - Unmap offset node * @node: Offset node * @file_mapping: Address space to unmap @node from * * Unmap all userspace mappings for a given offset node. The mappings must be * associated with the @file_mapping address-space. If no offset exists * nothing is done. * * This call is unlocked. The caller must guarantee that drm_vma_offset_remove() * is not called on this node concurrently. */
static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node, struct address_space *file_mapping) { if (drm_mm_node_allocated(&node->vm_node)) unmap_mapping_range(file_mapping, drm_vma_node_offset_addr(node), drm_vma_node_size(node) << PAGE_SHIFT, 1); }

Contributors

PersonTokensPropCommitsCommitProp
David Herrmann4291.30%150.00%
Daniel Vetter48.70%150.00%
Total46100.00%2100.00%

/** * drm_vma_node_verify_access() - Access verification helper for TTM * @node: Offset node * @tag: Tag of file to check * * This checks whether @tag is granted access to @node. It is the same as * drm_vma_node_is_allowed() but suitable as drop-in helper for TTM * verify_access() callbacks. * * RETURNS: * 0 if access is granted, -EACCES otherwise. */
static inline int drm_vma_node_verify_access(struct drm_vma_offset_node *node, struct drm_file *tag) { return drm_vma_node_is_allowed(node, tag) ? 0 : -EACCES; }

Contributors

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David Herrmann30100.00%2100.00%
Total30100.00%2100.00%

#endif /* __DRM_VMA_MANAGER_H__ */

Overall Contributors

PersonTokensPropCommitsCommitProp
David Herrmann47098.33%571.43%
Daniel Vetter81.67%228.57%
Total478100.00%7100.00%
Directory: include/drm
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