#ifndef __DRM_GEM_H__#define __DRM_GEM_H__ /* * GEM Graphics Execution Manager Driver Interfaces * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * Copyright (c) 2009-2010, Code Aurora Forum. * All rights reserved. * Copyright © 2014 Intel Corporation *   Daniel Vetter <daniel.vetter@ffwll.ch> * * Author: Rickard E. (Rik) Faith <faith@valinux.com> * Author: Gareth Hughes <gareth@valinux.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 (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 NONINFRINGEMENT.  IN NO EVENT SHALL * VA LINUX SYSTEMS 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. */ #include <linux/kref.h>#include <linux/dma-buf.h>#include <linux/dma-resv.h>#include <linux/list.h>#include <linux/mutex.h> #ifdef CONFIG_TRANSPARENT_HUGEPAGE#include <drm/drm_device.h>#endif#include <drm/drm_vma_manager.h> struct iosys_map;struct drm_gem_object; /** * enum drm_gem_object_status - bitmask of object state for fdinfo reporting * @DRM_GEM_OBJECT_RESIDENT: object is resident in memory (ie. not unpinned) * @DRM_GEM_OBJECT_PURGEABLE: object marked as purgeable by userspace * @DRM_GEM_OBJECT_ACTIVE: object is currently used by an active submission * * Bitmask of status used for fdinfo memory stats, see &drm_gem_object_funcs.status * and drm_show_fdinfo().  Note that an object can report DRM_GEM_OBJECT_PURGEABLE * and be active or not resident, in which case drm_show_fdinfo() will not * account for it as purgeable.  So drivers do not need to check if the buffer * is idle and resident to return this bit, i.e. userspace can mark a buffer as * purgeable even while it is still busy on the GPU. It will not get reported in * the puregeable stats until it becomes idle.  The status gem object func does * not need to consider this. */enum drm_gem_object_status {	DRM_GEM_OBJECT_RESIDENT  = BIT(0),	DRM_GEM_OBJECT_PURGEABLE = BIT(1),	DRM_GEM_OBJECT_ACTIVE    = BIT(2),}; /** * struct drm_gem_object_funcs - GEM object functions */struct drm_gem_object_funcs {	/**	 * @free:	 *	 * Deconstructor for drm_gem_objects.	 *	 * This callback is mandatory.	 */	void (*free)(struct drm_gem_object *obj); 	/**	 * @open:	 *	 * Called upon GEM handle creation.	 *	 * This callback is optional.	 */	int (*open)(struct drm_gem_object *obj, struct drm_file *file); 	/**	 * @close:	 *	 * Called upon GEM handle release.	 *	 * This callback is optional.	 */	void (*close)(struct drm_gem_object *obj, struct drm_file *file); 	/**	 * @print_info:	 *	 * If driver subclasses struct &drm_gem_object, it can implement this	 * optional hook for printing additional driver specific info.	 *	 * drm_printf_indent() should be used in the callback passing it the	 * indent argument.	 *	 * This callback is called from drm_gem_print_info().	 *	 * This callback is optional.	 */	void (*print_info)(struct drm_printer *p, unsigned int indent,			   const struct drm_gem_object *obj); 	/**	 * @export:	 *	 * Export backing buffer as a &dma_buf.	 * If this is not set drm_gem_prime_export() is used.	 *	 * This callback is optional.	 */	struct dma_buf *(*export)(struct drm_gem_object *obj, int flags); 	/**	 * @pin:	 *	 * Pin backing buffer in memory, such that dma-buf importers can	 * access it. Used by the drm_gem_map_attach() helper.	 *	 * This callback is optional.	 */	int (*pin)(struct drm_gem_object *obj); 	/**	 * @unpin:	 *	 * Unpin backing buffer. Used by the drm_gem_map_detach() helper.	 *	 * This callback is optional.	 */	void (*unpin)(struct drm_gem_object *obj); 	/**	 * @get_sg_table:	 *	 * Returns a Scatter-Gather table representation of the buffer.	 * Used when exporting a buffer by the drm_gem_map_dma_buf() helper.	 * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table()	 * in drm_gem_unmap_buf(), therefore these helpers and this callback	 * here cannot be used for sg tables pointing at driver private memory	 * ranges.	 *	 * See also drm_prime_pages_to_sg().	 */	struct sg_table *(*get_sg_table)(struct drm_gem_object *obj); 	/**	 * @vmap:	 *	 * Returns a virtual address for the buffer. Used by the	 * drm_gem_dmabuf_vmap() helper. Called with a held GEM reservation	 * lock.	 *	 * This callback is optional.	 */	int (*vmap)(struct drm_gem_object *obj, struct iosys_map *map); 	/**	 * @vunmap:	 *	 * Releases the address previously returned by @vmap. Used by the	 * drm_gem_dmabuf_vunmap() helper. Called with a held GEM reservation	 * lock.	 *	 * This callback is optional.	 */	void (*vunmap)(struct drm_gem_object *obj, struct iosys_map *map); 	/**	 * @mmap:	 *	 * Handle mmap() of the gem object, setup vma accordingly.	 *	 * This callback is optional.	 *	 * The callback is used by both drm_gem_mmap_obj() and	 * drm_gem_prime_mmap().  When @mmap is present @vm_ops is not	 * used, the @mmap callback must set vma->vm_ops instead.	 */	int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma); 	/**	 * @evict:	 *	 * Evicts gem object out from memory. Used by the drm_gem_object_evict()	 * helper. Returns 0 on success, -errno otherwise. Called with a held	 * GEM reservation lock.	 *	 * This callback is optional.	 */	int (*evict)(struct drm_gem_object *obj); 	/**	 * @status:	 *	 * The optional status callback can return additional object state	 * which determines which stats the object is counted against.  The	 * callback is called under table_lock.  Racing against object status	 * change is "harmless", and the callback can expect to not race	 * against object destruction.	 *	 * Called by drm_show_memory_stats().	 */	enum drm_gem_object_status (*status)(struct drm_gem_object *obj); 	/**	 * @rss:	 *	 * Return resident size of the object in physical memory.	 *	 * Called by drm_show_memory_stats().	 */	size_t (*rss)(struct drm_gem_object *obj); 	/**	 * @vm_ops:	 *	 * Virtual memory operations used with mmap.	 *	 * This is optional but necessary for mmap support.	 */	const struct vm_operations_struct *vm_ops;}; /** * struct drm_gem_lru - A simple LRU helper * * A helper for tracking GEM objects in a given state, to aid in * driver's shrinker implementation.  Tracks the count of pages * for lockless &shrinker.count_objects, and provides * &drm_gem_lru_scan for driver's &shrinker.scan_objects * implementation. * * Any access to this kind of object must be done with * drm_device::gem_lru_mutex held. */struct drm_gem_lru {	/**	 * @count:	 *	 * The total number of backing pages of the GEM objects in	 * this LRU.	 */	long count; 	/**	 * @list:	 *	 * The LRU list.	 */	struct list_head list;}; /** * struct drm_gem_object - GEM buffer object * * This structure defines the generic parts for GEM buffer objects, which are * mostly around handling mmap and userspace handles. * * Buffer objects are often abbreviated to BO. */struct drm_gem_object {	/**	 * @refcount:	 *	 * Reference count of this object	 *	 * Please use drm_gem_object_get() to acquire and drm_gem_object_put_locked()	 * or drm_gem_object_put() to release a reference to a GEM	 * buffer object.	 */	struct kref refcount; 	/**	 * @handle_count:	 *	 * This is the GEM file_priv handle count of this object.	 *	 * Each handle also holds a reference. Note that when the handle_count	 * drops to 0 any global names (e.g. the id in the flink namespace) will	 * be cleared.	 *	 * Protected by &drm_device.object_name_lock.	 */	unsigned handle_count; 	/**	 * @dev: DRM dev this object belongs to.	 */	struct drm_device *dev; 	/**	 * @filp:	 *	 * SHMEM file node used as backing storage for swappable buffer objects.	 * GEM also supports driver private objects with driver-specific backing	 * storage (contiguous DMA memory, special reserved blocks). In this	 * case @filp is NULL.	 */	struct file *filp; 	/**	 * @vma_node:	 *	 * Mapping info for this object to support mmap. Drivers are supposed to	 * allocate the mmap offset using drm_gem_create_mmap_offset(). The	 * offset itself can be retrieved using drm_vma_node_offset_addr().	 *	 * Memory mapping itself is handled by drm_gem_mmap(), which also checks	 * that userspace is allowed to access the object.	 */	struct drm_vma_offset_node vma_node; 	/**	 * @size:	 *	 * Size of the object, in bytes.  Immutable over the object's	 * lifetime.	 */	size_t size; 	/**	 * @name:	 *	 * Global name for this object, starts at 1. 0 means unnamed.	 * Access is covered by &drm_device.object_name_lock. This is used by	 * the GEM_FLINK and GEM_OPEN ioctls.	 */	int name; 	/**	 * @dma_buf:	 *	 * dma-buf associated with this GEM object.	 *	 * Pointer to the dma-buf associated with this gem object (either	 * through importing or exporting). We break the resulting reference	 * loop when the last gem handle for this object is released.	 *	 * Protected by &drm_device.object_name_lock.	 */	struct dma_buf *dma_buf; 	/**	 * @import_attach:	 *	 * dma-buf attachment backing this object.	 *	 * Any foreign dma_buf imported as a gem object has this set to the	 * attachment point for the device. This is invariant over the lifetime	 * of a gem object.	 *	 * The &drm_gem_object_funcs.free callback is responsible for	 * cleaning up the dma_buf attachment and references acquired at import	 * time.	 *	 * Note that the drm gem/prime core does not depend upon drivers setting	 * this field any more. So for drivers where this doesn't make sense	 * (e.g. virtual devices or a displaylink behind an usb bus) they can	 * simply leave it as NULL.	 */	struct dma_buf_attachment *import_attach; 	/**	 * @resv:	 *	 * Pointer to reservation object associated with the this GEM object.	 *	 * Normally (@resv == &@_resv) except for imported GEM objects.	 */	struct dma_resv *resv; 	/**	 * @_resv:	 *	 * A reservation object for this GEM object.	 *	 * This is unused for imported GEM objects.	 */	struct dma_resv _resv; 	/**	 * @gpuva: Fields used by GPUVM to manage mappings pointing to this GEM object.	 *	 * When DRM_GPUVM_IMMEDIATE_MODE is set, this list is protected by the	 * mutex. Otherwise, the list is protected by the GEMs &dma_resv lock.	 *	 * Note that all entries in this list must agree on whether	 * DRM_GPUVM_IMMEDIATE_MODE is set.	 */	struct {		/**		 * @gpuva.list: list of GPUVM mappings attached to this GEM object.		 *		 * Drivers should lock list accesses with either the GEMs		 * &dma_resv lock (&drm_gem_object.resv) or the		 * &drm_gem_object.gpuva.lock mutex.		 */		struct list_head list; 		/**		 * @gpuva.lock: lock protecting access to &drm_gem_object.gpuva.list		 * when DRM_GPUVM_IMMEDIATE_MODE is used.		 *		 * Only used when DRM_GPUVM_IMMEDIATE_MODE is set. It should be		 * safe to take this mutex during the fence signalling path, so		 * do not allocate memory while holding this lock. Otherwise,		 * the &dma_resv lock should be used.		 */		struct mutex lock;	} gpuva; 	/**	 * @funcs:	 *	 * Optional GEM object functions. If this is set, it will be used instead of the	 * corresponding &drm_driver GEM callbacks.	 *	 * New drivers should use this.	 *	 */	const struct drm_gem_object_funcs *funcs; 	/**	 * @lru_node:	 *	 * List node in a &drm_gem_lru.	 */	struct list_head lru_node; 	/**	 * @lru:	 *	 * The current LRU list that the GEM object is on.	 *	 * Access to this field must be done with drm_device::gem_lru_mutex	 * held.	 */	struct drm_gem_lru *lru;}; /** * DRM_GEM_FOPS - Default drm GEM file operations * * This macro provides a shorthand for setting the GEM file ops in the * &file_operations structure.  If all you need are the default ops, use * DEFINE_DRM_GEM_FOPS instead. */#define DRM_GEM_FOPS \	.open		= drm_open,\	.release	= drm_release,\	.unlocked_ioctl	= drm_ioctl,\	.compat_ioctl	= drm_compat_ioctl,\	.poll		= drm_poll,\	.read		= drm_read,\	.llseek		= noop_llseek,\	.get_unmapped_area	= drm_gem_get_unmapped_area,\	.mmap		= drm_gem_mmap, \	.fop_flags	= FOP_UNSIGNED_OFFSET /** * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers * @name: name for the generated structure * * This macro autogenerates a suitable &struct file_operations for GEM based * drivers, which can be assigned to &drm_driver.fops. Note that this structure * cannot be shared between drivers, because it contains a reference to the * current module using THIS_MODULE. * * Note that the declaration is already marked as static - if you need a * non-static version of this you're probably doing it wrong and will break the * THIS_MODULE reference by accident. */#define DEFINE_DRM_GEM_FOPS(name) \	static const struct file_operations name = {\		.owner		= THIS_MODULE,\		DRM_GEM_FOPS,\	} #ifdef CONFIG_TRANSPARENT_HUGEPAGEint drm_gem_huge_mnt_create(struct drm_device *dev, const char *value);#elsestatic inline int drm_gem_huge_mnt_create(struct drm_device *dev,					  const char *value){

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