1#ifndef __DRM_GEM_H__
  2#define __DRM_GEM_H__
  3
  4/*
  5 * GEM Graphics Execution Manager Driver Interfaces
  6 *
  7 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  8 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  9 * Copyright (c) 2009-2010, Code Aurora Forum.
 10 * All rights reserved.
 11 * Copyright © 2014 Intel Corporation
 12 *   Daniel Vetter <daniel.vetter@ffwll.ch>
 13 *
 14 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
 15 * Author: Gareth Hughes <gareth@valinux.com>
 16 *
 17 * Permission is hereby granted, free of charge, to any person obtaining a
 18 * copy of this software and associated documentation files (the "Software"),
 19 * to deal in the Software without restriction, including without limitation
 20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 21 * and/or sell copies of the Software, and to permit persons to whom the
 22 * Software is furnished to do so, subject to the following conditions:
 23 *
 24 * The above copyright notice and this permission notice (including the next
 25 * paragraph) shall be included in all copies or substantial portions of the
 26 * Software.
 27 *
 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 34 * OTHER DEALINGS IN THE SOFTWARE.
 35 */
 36
 37#include <linux/kref.h>
 38#include <linux/dma-resv.h>
 39
 40#include <drm/drm_vma_manager.h>
 41
 42struct drm_gem_object;
 43
 44/**
 45 * struct drm_gem_object_funcs - GEM object functions
 46 */
 47struct drm_gem_object_funcs {
 48	/**
 49	 * @free:
 50	 *
 51	 * Deconstructor for drm_gem_objects.
 52	 *
 53	 * This callback is mandatory.
 54	 */
 55	void (*free)(struct drm_gem_object *obj);
 56
 57	/**
 58	 * @open:
 59	 *
 60	 * Called upon GEM handle creation.
 61	 *
 62	 * This callback is optional.
 63	 */
 64	int (*open)(struct drm_gem_object *obj, struct drm_file *file);
 65
 66	/**
 67	 * @close:
 68	 *
 69	 * Called upon GEM handle release.
 70	 *
 71	 * This callback is optional.
 72	 */
 73	void (*close)(struct drm_gem_object *obj, struct drm_file *file);
 74
 75	/**
 76	 * @print_info:
 77	 *
 78	 * If driver subclasses struct &drm_gem_object, it can implement this
 79	 * optional hook for printing additional driver specific info.
 80	 *
 81	 * drm_printf_indent() should be used in the callback passing it the
 82	 * indent argument.
 83	 *
 84	 * This callback is called from drm_gem_print_info().
 85	 *
 86	 * This callback is optional.
 87	 */
 88	void (*print_info)(struct drm_printer *p, unsigned int indent,
 89			   const struct drm_gem_object *obj);
 90
 91	/**
 92	 * @export:
 93	 *
 94	 * Export backing buffer as a &dma_buf.
 95	 * If this is not set drm_gem_prime_export() is used.
 96	 *
 97	 * This callback is optional.
 98	 */
 99	struct dma_buf *(*export)(struct drm_gem_object *obj, int flags);
100
101	/**
102	 * @pin:
103	 *
104	 * Pin backing buffer in memory. Used by the drm_gem_map_attach() helper.
105	 *
106	 * This callback is optional.
107	 */
108	int (*pin)(struct drm_gem_object *obj);
109
110	/**
111	 * @unpin:
112	 *
113	 * Unpin backing buffer. Used by the drm_gem_map_detach() helper.
114	 *
115	 * This callback is optional.
116	 */
117	void (*unpin)(struct drm_gem_object *obj);
118
119	/**
120	 * @get_sg_table:
121	 *
122	 * Returns a Scatter-Gather table representation of the buffer.
123	 * Used when exporting a buffer by the drm_gem_map_dma_buf() helper.
124	 * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table()
125	 * in drm_gem_unmap_buf(), therefore these helpers and this callback
126	 * here cannot be used for sg tables pointing at driver private memory
127	 * ranges.
128	 *
129	 * See also drm_prime_pages_to_sg().
130	 */
131	struct sg_table *(*get_sg_table)(struct drm_gem_object *obj);
132
133	/**
134	 * @vmap:
135	 *
136	 * Returns a virtual address for the buffer. Used by the
137	 * drm_gem_dmabuf_vmap() helper.
138	 *
139	 * This callback is optional.
140	 */
141	void *(*vmap)(struct drm_gem_object *obj);
142
143	/**
144	 * @vunmap:
145	 *
146	 * Releases the the address previously returned by @vmap. Used by the
147	 * drm_gem_dmabuf_vunmap() helper.
148	 *
149	 * This callback is optional.
150	 */
151	void (*vunmap)(struct drm_gem_object *obj, void *vaddr);
152
153	/**
154	 * @vm_ops:
155	 *
156	 * Virtual memory operations used with mmap.
157	 *
158	 * This is optional but necessary for mmap support.
159	 */
160	const struct vm_operations_struct *vm_ops;
161};
162
163/**
164 * struct drm_gem_object - GEM buffer object
165 *
166 * This structure defines the generic parts for GEM buffer objects, which are
167 * mostly around handling mmap and userspace handles.
168 *
169 * Buffer objects are often abbreviated to BO.
170 */
171struct drm_gem_object {
172	/**
173	 * @refcount:
174	 *
175	 * Reference count of this object
176	 *
177	 * Please use drm_gem_object_get() to acquire and drm_gem_object_put()
178	 * or drm_gem_object_put_unlocked() to release a reference to a GEM
179	 * buffer object.
180	 */
181	struct kref refcount;
182
183	/**
184	 * @handle_count:
185	 *
186	 * This is the GEM file_priv handle count of this object.
187	 *
188	 * Each handle also holds a reference. Note that when the handle_count
189	 * drops to 0 any global names (e.g. the id in the flink namespace) will
190	 * be cleared.
191	 *
192	 * Protected by &drm_device.object_name_lock.
193	 */
194	unsigned handle_count;
195
196	/**
197	 * @dev: DRM dev this object belongs to.
198	 */
199	struct drm_device *dev;
200
201	/**
202	 * @filp:
203	 *
204	 * SHMEM file node used as backing storage for swappable buffer objects.
205	 * GEM also supports driver private objects with driver-specific backing
206	 * storage (contiguous CMA memory, special reserved blocks). In this
207	 * case @filp is NULL.
208	 */
209	struct file *filp;
210
211	/**
212	 * @vma_node:
213	 *
214	 * Mapping info for this object to support mmap. Drivers are supposed to
215	 * allocate the mmap offset using drm_gem_create_mmap_offset(). The
216	 * offset itself can be retrieved using drm_vma_node_offset_addr().
217	 *
218	 * Memory mapping itself is handled by drm_gem_mmap(), which also checks
219	 * that userspace is allowed to access the object.
220	 */
221	struct drm_vma_offset_node vma_node;
222
223	/**
224	 * @size:
225	 *
226	 * Size of the object, in bytes.  Immutable over the object's
227	 * lifetime.
228	 */
229	size_t size;
230
231	/**
232	 * @name:
233	 *
234	 * Global name for this object, starts at 1. 0 means unnamed.
235	 * Access is covered by &drm_device.object_name_lock. This is used by
236	 * the GEM_FLINK and GEM_OPEN ioctls.
237	 */
238	int name;
239
240	/**
241	 * @dma_buf:
242	 *
243	 * dma-buf associated with this GEM object.
244	 *
245	 * Pointer to the dma-buf associated with this gem object (either
246	 * through importing or exporting). We break the resulting reference
247	 * loop when the last gem handle for this object is released.
248	 *
249	 * Protected by &drm_device.object_name_lock.
250	 */
251	struct dma_buf *dma_buf;
252
253	/**
254	 * @import_attach:
255	 *
256	 * dma-buf attachment backing this object.
257	 *
258	 * Any foreign dma_buf imported as a gem object has this set to the
259	 * attachment point for the device. This is invariant over the lifetime
260	 * of a gem object.
261	 *
262	 * The &drm_driver.gem_free_object callback is responsible for cleaning
263	 * up the dma_buf attachment and references acquired at import time.
264	 *
265	 * Note that the drm gem/prime core does not depend upon drivers setting
266	 * this field any more. So for drivers where this doesn't make sense
267	 * (e.g. virtual devices or a displaylink behind an usb bus) they can
268	 * simply leave it as NULL.
269	 */
270	struct dma_buf_attachment *import_attach;
271
272	/**
273	 * @resv:
274	 *
275	 * Pointer to reservation object associated with the this GEM object.
276	 *
277	 * Normally (@resv == &@_resv) except for imported GEM objects.
278	 */
279	struct dma_resv *resv;
280
281	/**
282	 * @_resv:
283	 *
284	 * A reservation object for this GEM object.
285	 *
286	 * This is unused for imported GEM objects.
287	 */
288	struct dma_resv _resv;
289
290	/**
291	 * @funcs:
292	 *
293	 * Optional GEM object functions. If this is set, it will be used instead of the
294	 * corresponding &drm_driver GEM callbacks.
295	 *
296	 * New drivers should use this.
297	 *
298	 */
299	const struct drm_gem_object_funcs *funcs;
300};
301
302/**
303 * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
304 * @name: name for the generated structure
305 *
306 * This macro autogenerates a suitable &struct file_operations for GEM based
307 * drivers, which can be assigned to &drm_driver.fops. Note that this structure
308 * cannot be shared between drivers, because it contains a reference to the
309 * current module using THIS_MODULE.
310 *
311 * Note that the declaration is already marked as static - if you need a
312 * non-static version of this you're probably doing it wrong and will break the
313 * THIS_MODULE reference by accident.
314 */
315#define DEFINE_DRM_GEM_FOPS(name) \
316	static const struct file_operations name = {\
317		.owner		= THIS_MODULE,\
318		.open		= drm_open,\
319		.release	= drm_release,\
320		.unlocked_ioctl	= drm_ioctl,\
321		.compat_ioctl	= drm_compat_ioctl,\
322		.poll		= drm_poll,\
323		.read		= drm_read,\
324		.llseek		= noop_llseek,\
325		.mmap		= drm_gem_mmap,\
326	}
327
328void drm_gem_object_release(struct drm_gem_object *obj);
329void drm_gem_object_free(struct kref *kref);
330int drm_gem_object_init(struct drm_device *dev,
331			struct drm_gem_object *obj, size_t size);
332void drm_gem_private_object_init(struct drm_device *dev,
333				 struct drm_gem_object *obj, size_t size);
334void drm_gem_vm_open(struct vm_area_struct *vma);
335void drm_gem_vm_close(struct vm_area_struct *vma);
336int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
337		     struct vm_area_struct *vma);
338int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
339
340/**
341 * drm_gem_object_get - acquire a GEM buffer object reference
342 * @obj: GEM buffer object
343 *
344 * This function acquires an additional reference to @obj. It is illegal to
345 * call this without already holding a reference. No locks required.
346 */
347static inline void drm_gem_object_get(struct drm_gem_object *obj)
348{
349	kref_get(&obj->refcount);
350}
351
352/**
353 * __drm_gem_object_put - raw function to release a GEM buffer object reference
354 * @obj: GEM buffer object
355 *
356 * This function is meant to be used by drivers which are not encumbered with
357 * &drm_device.struct_mutex legacy locking and which are using the
358 * gem_free_object_unlocked callback. It avoids all the locking checks and
359 * locking overhead of drm_gem_object_put() and drm_gem_object_put_unlocked().
360 *
361 * Drivers should never call this directly in their code. Instead they should
362 * wrap it up into a ``driver_gem_object_put(struct driver_gem_object *obj)``
363 * wrapper function, and use that. Shared code should never call this, to
364 * avoid breaking drivers by accident which still depend upon
365 * &drm_device.struct_mutex locking.
366 */
367static inline void
368__drm_gem_object_put(struct drm_gem_object *obj)
369{
370	kref_put(&obj->refcount, drm_gem_object_free);
371}
372
373void drm_gem_object_put_unlocked(struct drm_gem_object *obj);
374void drm_gem_object_put(struct drm_gem_object *obj);
375
376int drm_gem_handle_create(struct drm_file *file_priv,
377			  struct drm_gem_object *obj,
378			  u32 *handlep);
379int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
380
381
382void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
383int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
384int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
385
386struct page **drm_gem_get_pages(struct drm_gem_object *obj);
387void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
388		bool dirty, bool accessed);
389
390int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
391			   int count, struct drm_gem_object ***objs_out);
392struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
393long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
394				    bool wait_all, unsigned long timeout);
395int drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
396			      struct ww_acquire_ctx *acquire_ctx);
397void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
398				 struct ww_acquire_ctx *acquire_ctx);
399int drm_gem_fence_array_add(struct xarray *fence_array,
400			    struct dma_fence *fence);
401int drm_gem_fence_array_add_implicit(struct xarray *fence_array,
402				     struct drm_gem_object *obj,
403				     bool write);
404int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
405			    u32 handle, u64 *offset);
406int drm_gem_dumb_destroy(struct drm_file *file,
407			 struct drm_device *dev,
408			 uint32_t handle);
409
410#endif /* __DRM_GEM_H__ */