1 /**************************************************************************
2 *
3 * Copyright © 2011 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 #include <drm/ttm/ttm_placement.h>
29
30 #include <drm/drmP.h>
31 #include "vmwgfx_drv.h"
32
33
34 /**
35 * vmw_dmabuf_to_placement - Validate a buffer to placement.
36 *
37 * @dev_priv: Driver private.
38 * @buf: DMA buffer to move.
39 * @pin: Pin buffer if true.
40 * @interruptible: Use interruptible wait.
41 *
42 * May only be called by the current master since it assumes that the
43 * master lock is the current master's lock.
44 * This function takes the master's lock in write mode.
45 * Flushes and unpins the query bo to avoid failures.
46 *
47 * Returns
48 * -ERESTARTSYS if interrupted by a signal.
49 */
vmw_dmabuf_to_placement(struct vmw_private * dev_priv,struct vmw_dma_buffer * buf,struct ttm_placement * placement,bool interruptible)50 int vmw_dmabuf_to_placement(struct vmw_private *dev_priv,
51 struct vmw_dma_buffer *buf,
52 struct ttm_placement *placement,
53 bool interruptible)
54 {
55 struct vmw_master *vmaster = dev_priv->active_master;
56 struct ttm_buffer_object *bo = &buf->base;
57 int ret;
58
59 ret = ttm_write_lock(&vmaster->lock, interruptible);
60 if (unlikely(ret != 0))
61 return ret;
62
63 vmw_execbuf_release_pinned_bo(dev_priv);
64
65 ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
66 if (unlikely(ret != 0))
67 goto err;
68
69 ret = ttm_bo_validate(bo, placement, interruptible, false);
70
71 ttm_bo_unreserve(bo);
72
73 err:
74 ttm_write_unlock(&vmaster->lock);
75 return ret;
76 }
77
78 /**
79 * vmw_dmabuf_to_vram_or_gmr - Move a buffer to vram or gmr.
80 *
81 * May only be called by the current master since it assumes that the
82 * master lock is the current master's lock.
83 * This function takes the master's lock in write mode.
84 * Flushes and unpins the query bo if @pin == true to avoid failures.
85 *
86 * @dev_priv: Driver private.
87 * @buf: DMA buffer to move.
88 * @pin: Pin buffer if true.
89 * @interruptible: Use interruptible wait.
90 *
91 * Returns
92 * -ERESTARTSYS if interrupted by a signal.
93 */
vmw_dmabuf_to_vram_or_gmr(struct vmw_private * dev_priv,struct vmw_dma_buffer * buf,bool pin,bool interruptible)94 int vmw_dmabuf_to_vram_or_gmr(struct vmw_private *dev_priv,
95 struct vmw_dma_buffer *buf,
96 bool pin, bool interruptible)
97 {
98 struct vmw_master *vmaster = dev_priv->active_master;
99 struct ttm_buffer_object *bo = &buf->base;
100 struct ttm_placement *placement;
101 int ret;
102
103 ret = ttm_write_lock(&vmaster->lock, interruptible);
104 if (unlikely(ret != 0))
105 return ret;
106
107 if (pin)
108 vmw_execbuf_release_pinned_bo(dev_priv);
109
110 ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
111 if (unlikely(ret != 0))
112 goto err;
113
114 /**
115 * Put BO in VRAM if there is space, otherwise as a GMR.
116 * If there is no space in VRAM and GMR ids are all used up,
117 * start evicting GMRs to make room. If the DMA buffer can't be
118 * used as a GMR, this will return -ENOMEM.
119 */
120
121 if (pin)
122 placement = &vmw_vram_gmr_ne_placement;
123 else
124 placement = &vmw_vram_gmr_placement;
125
126 ret = ttm_bo_validate(bo, placement, interruptible, false);
127 if (likely(ret == 0) || ret == -ERESTARTSYS)
128 goto err_unreserve;
129
130
131 /**
132 * If that failed, try VRAM again, this time evicting
133 * previous contents.
134 */
135
136 if (pin)
137 placement = &vmw_vram_ne_placement;
138 else
139 placement = &vmw_vram_placement;
140
141 ret = ttm_bo_validate(bo, placement, interruptible, false);
142
143 err_unreserve:
144 ttm_bo_unreserve(bo);
145 err:
146 ttm_write_unlock(&vmaster->lock);
147 return ret;
148 }
149
150 /**
151 * vmw_dmabuf_to_vram - Move a buffer to vram.
152 *
153 * May only be called by the current master since it assumes that the
154 * master lock is the current master's lock.
155 * This function takes the master's lock in write mode.
156 *
157 * @dev_priv: Driver private.
158 * @buf: DMA buffer to move.
159 * @pin: Pin buffer in vram if true.
160 * @interruptible: Use interruptible wait.
161 *
162 * Returns
163 * -ERESTARTSYS if interrupted by a signal.
164 */
vmw_dmabuf_to_vram(struct vmw_private * dev_priv,struct vmw_dma_buffer * buf,bool pin,bool interruptible)165 int vmw_dmabuf_to_vram(struct vmw_private *dev_priv,
166 struct vmw_dma_buffer *buf,
167 bool pin, bool interruptible)
168 {
169 struct ttm_placement *placement;
170
171 if (pin)
172 placement = &vmw_vram_ne_placement;
173 else
174 placement = &vmw_vram_placement;
175
176 return vmw_dmabuf_to_placement(dev_priv, buf,
177 placement,
178 interruptible);
179 }
180
181 /**
182 * vmw_dmabuf_to_start_of_vram - Move a buffer to start of vram.
183 *
184 * May only be called by the current master since it assumes that the
185 * master lock is the current master's lock.
186 * This function takes the master's lock in write mode.
187 * Flushes and unpins the query bo if @pin == true to avoid failures.
188 *
189 * @dev_priv: Driver private.
190 * @buf: DMA buffer to move.
191 * @pin: Pin buffer in vram if true.
192 * @interruptible: Use interruptible wait.
193 *
194 * Returns
195 * -ERESTARTSYS if interrupted by a signal.
196 */
vmw_dmabuf_to_start_of_vram(struct vmw_private * dev_priv,struct vmw_dma_buffer * buf,bool pin,bool interruptible)197 int vmw_dmabuf_to_start_of_vram(struct vmw_private *dev_priv,
198 struct vmw_dma_buffer *buf,
199 bool pin, bool interruptible)
200 {
201 struct vmw_master *vmaster = dev_priv->active_master;
202 struct ttm_buffer_object *bo = &buf->base;
203 struct ttm_placement placement;
204 int ret = 0;
205
206 if (pin)
207 placement = vmw_vram_ne_placement;
208 else
209 placement = vmw_vram_placement;
210 placement.lpfn = bo->num_pages;
211
212 ret = ttm_write_lock(&vmaster->lock, interruptible);
213 if (unlikely(ret != 0))
214 return ret;
215
216 if (pin)
217 vmw_execbuf_release_pinned_bo(dev_priv);
218 ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
219 if (unlikely(ret != 0))
220 goto err_unlock;
221
222 /* Is this buffer already in vram but not at the start of it? */
223 if (bo->mem.mem_type == TTM_PL_VRAM &&
224 bo->mem.start < bo->num_pages &&
225 bo->mem.start > 0)
226 (void) ttm_bo_validate(bo, &vmw_sys_placement, false, false);
227
228 ret = ttm_bo_validate(bo, &placement, interruptible, false);
229
230 /* For some reason we didn't up at the start of vram */
231 WARN_ON(ret == 0 && bo->offset != 0);
232
233 ttm_bo_unreserve(bo);
234 err_unlock:
235 ttm_write_unlock(&vmaster->lock);
236
237 return ret;
238 }
239
240
241 /**
242 * vmw_dmabuf_upin - Unpin the buffer given buffer, does not move the buffer.
243 *
244 * May only be called by the current master since it assumes that the
245 * master lock is the current master's lock.
246 * This function takes the master's lock in write mode.
247 *
248 * @dev_priv: Driver private.
249 * @buf: DMA buffer to unpin.
250 * @interruptible: Use interruptible wait.
251 *
252 * Returns
253 * -ERESTARTSYS if interrupted by a signal.
254 */
vmw_dmabuf_unpin(struct vmw_private * dev_priv,struct vmw_dma_buffer * buf,bool interruptible)255 int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
256 struct vmw_dma_buffer *buf,
257 bool interruptible)
258 {
259 /*
260 * We could in theory early out if the buffer is
261 * unpinned but we need to lock and reserve the buffer
262 * anyways so we don't gain much by that.
263 */
264 return vmw_dmabuf_to_placement(dev_priv, buf,
265 &vmw_evictable_placement,
266 interruptible);
267 }
268
269
270 /**
271 * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
272 * of a buffer.
273 *
274 * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
275 * @ptr: SVGAGuestPtr returning the result.
276 */
vmw_bo_get_guest_ptr(const struct ttm_buffer_object * bo,SVGAGuestPtr * ptr)277 void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
278 SVGAGuestPtr *ptr)
279 {
280 if (bo->mem.mem_type == TTM_PL_VRAM) {
281 ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
282 ptr->offset = bo->offset;
283 } else {
284 ptr->gmrId = bo->mem.start;
285 ptr->offset = 0;
286 }
287 }
288
289
290 /**
291 * vmw_bo_pin - Pin or unpin a buffer object without moving it.
292 *
293 * @bo: The buffer object. Must be reserved, and present either in VRAM
294 * or GMR memory.
295 * @pin: Whether to pin or unpin.
296 *
297 */
vmw_bo_pin(struct ttm_buffer_object * bo,bool pin)298 void vmw_bo_pin(struct ttm_buffer_object *bo, bool pin)
299 {
300 uint32_t pl_flags;
301 struct ttm_placement placement;
302 uint32_t old_mem_type = bo->mem.mem_type;
303 int ret;
304
305 BUG_ON(!ttm_bo_is_reserved(bo));
306 BUG_ON(old_mem_type != TTM_PL_VRAM &&
307 old_mem_type != VMW_PL_GMR);
308
309 pl_flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED;
310 if (pin)
311 pl_flags |= TTM_PL_FLAG_NO_EVICT;
312
313 memset(&placement, 0, sizeof(placement));
314 placement.num_placement = 1;
315 placement.placement = &pl_flags;
316
317 ret = ttm_bo_validate(bo, &placement, false, true);
318
319 BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
320 }
321