Linux 4.2.1
[linux/fpc-iii.git] / drivers / gpu / drm / vmwgfx / vmwgfx_dmabuf.c
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1 /**************************************************************************
3 * Copyright © 2011 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
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:
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.
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.
26 **************************************************************************/
28 #include <drm/ttm/ttm_placement.h>
30 #include <drm/drmP.h>
31 #include "vmwgfx_drv.h"
34 /**
35 * vmw_dmabuf_to_placement - Validate a buffer to placement.
37 * @dev_priv: Driver private.
38 * @buf: DMA buffer to move.
39 * @pin: Pin buffer if true.
40 * @interruptible: Use interruptible wait.
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.
47 * Returns
48 * -ERESTARTSYS if interrupted by a signal.
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)
55 struct ttm_buffer_object *bo = &buf->base;
56 int ret;
58 ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
59 if (unlikely(ret != 0))
60 return ret;
62 vmw_execbuf_release_pinned_bo(dev_priv);
64 ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);
65 if (unlikely(ret != 0))
66 goto err;
68 ret = ttm_bo_validate(bo, placement, interruptible, false);
70 ttm_bo_unreserve(bo);
72 err:
73 ttm_write_unlock(&dev_priv->reservation_sem);
74 return ret;
77 /**
78 * vmw_dmabuf_to_vram_or_gmr - Move a buffer to vram or gmr.
80 * May only be called by the current master since it assumes that the
81 * master lock is the current master's lock.
82 * This function takes the master's lock in write mode.
83 * Flushes and unpins the query bo if @pin == true to avoid failures.
85 * @dev_priv: Driver private.
86 * @buf: DMA buffer to move.
87 * @pin: Pin buffer if true.
88 * @interruptible: Use interruptible wait.
90 * Returns
91 * -ERESTARTSYS if interrupted by a signal.
93 int vmw_dmabuf_to_vram_or_gmr(struct vmw_private *dev_priv,
94 struct vmw_dma_buffer *buf,
95 bool pin, bool interruptible)
97 struct ttm_buffer_object *bo = &buf->base;
98 struct ttm_placement *placement;
99 int ret;
101 ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
102 if (unlikely(ret != 0))
103 return ret;
105 if (pin)
106 vmw_execbuf_release_pinned_bo(dev_priv);
108 ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);
109 if (unlikely(ret != 0))
110 goto err;
113 * Put BO in VRAM if there is space, otherwise as a GMR.
114 * If there is no space in VRAM and GMR ids are all used up,
115 * start evicting GMRs to make room. If the DMA buffer can't be
116 * used as a GMR, this will return -ENOMEM.
119 if (pin)
120 placement = &vmw_vram_gmr_ne_placement;
121 else
122 placement = &vmw_vram_gmr_placement;
124 ret = ttm_bo_validate(bo, placement, interruptible, false);
125 if (likely(ret == 0) || ret == -ERESTARTSYS)
126 goto err_unreserve;
130 * If that failed, try VRAM again, this time evicting
131 * previous contents.
134 if (pin)
135 placement = &vmw_vram_ne_placement;
136 else
137 placement = &vmw_vram_placement;
139 ret = ttm_bo_validate(bo, placement, interruptible, false);
141 err_unreserve:
142 ttm_bo_unreserve(bo);
143 err:
144 ttm_write_unlock(&dev_priv->reservation_sem);
145 return ret;
149 * vmw_dmabuf_to_vram - Move a buffer to vram.
151 * May only be called by the current master since it assumes that the
152 * master lock is the current master's lock.
153 * This function takes the master's lock in write mode.
155 * @dev_priv: Driver private.
156 * @buf: DMA buffer to move.
157 * @pin: Pin buffer in vram if true.
158 * @interruptible: Use interruptible wait.
160 * Returns
161 * -ERESTARTSYS if interrupted by a signal.
163 int vmw_dmabuf_to_vram(struct vmw_private *dev_priv,
164 struct vmw_dma_buffer *buf,
165 bool pin, bool interruptible)
167 struct ttm_placement *placement;
169 if (pin)
170 placement = &vmw_vram_ne_placement;
171 else
172 placement = &vmw_vram_placement;
174 return vmw_dmabuf_to_placement(dev_priv, buf,
175 placement,
176 interruptible);
180 * vmw_dmabuf_to_start_of_vram - Move a buffer to start of vram.
182 * May only be called by the current master since it assumes that the
183 * master lock is the current master's lock.
184 * This function takes the master's lock in write mode.
185 * Flushes and unpins the query bo if @pin == true to avoid failures.
187 * @dev_priv: Driver private.
188 * @buf: DMA buffer to move.
189 * @pin: Pin buffer in vram if true.
190 * @interruptible: Use interruptible wait.
192 * Returns
193 * -ERESTARTSYS if interrupted by a signal.
195 int vmw_dmabuf_to_start_of_vram(struct vmw_private *dev_priv,
196 struct vmw_dma_buffer *buf,
197 bool pin, bool interruptible)
199 struct ttm_buffer_object *bo = &buf->base;
200 struct ttm_placement placement;
201 struct ttm_place place;
202 int ret = 0;
204 if (pin)
205 place = vmw_vram_ne_placement.placement[0];
206 else
207 place = vmw_vram_placement.placement[0];
208 place.lpfn = bo->num_pages;
210 placement.num_placement = 1;
211 placement.placement = &place;
212 placement.num_busy_placement = 1;
213 placement.busy_placement = &place;
215 ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
216 if (unlikely(ret != 0))
217 return ret;
219 if (pin)
220 vmw_execbuf_release_pinned_bo(dev_priv);
221 ret = ttm_bo_reserve(bo, interruptible, false, false, NULL);
222 if (unlikely(ret != 0))
223 goto err_unlock;
225 /* Is this buffer already in vram but not at the start of it? */
226 if (bo->mem.mem_type == TTM_PL_VRAM &&
227 bo->mem.start < bo->num_pages &&
228 bo->mem.start > 0)
229 (void) ttm_bo_validate(bo, &vmw_sys_placement, false, false);
231 ret = ttm_bo_validate(bo, &placement, interruptible, false);
233 /* For some reason we didn't up at the start of vram */
234 WARN_ON(ret == 0 && bo->offset != 0);
236 ttm_bo_unreserve(bo);
237 err_unlock:
238 ttm_write_unlock(&dev_priv->reservation_sem);
240 return ret;
245 * vmw_dmabuf_upin - Unpin the buffer given buffer, does not move the buffer.
247 * May only be called by the current master since it assumes that the
248 * master lock is the current master's lock.
249 * This function takes the master's lock in write mode.
251 * @dev_priv: Driver private.
252 * @buf: DMA buffer to unpin.
253 * @interruptible: Use interruptible wait.
255 * Returns
256 * -ERESTARTSYS if interrupted by a signal.
258 int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
259 struct vmw_dma_buffer *buf,
260 bool interruptible)
263 * We could in theory early out if the buffer is
264 * unpinned but we need to lock and reserve the buffer
265 * anyways so we don't gain much by that.
267 return vmw_dmabuf_to_placement(dev_priv, buf,
268 &vmw_evictable_placement,
269 interruptible);
274 * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
275 * of a buffer.
277 * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
278 * @ptr: SVGAGuestPtr returning the result.
280 void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
281 SVGAGuestPtr *ptr)
283 if (bo->mem.mem_type == TTM_PL_VRAM) {
284 ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
285 ptr->offset = bo->offset;
286 } else {
287 ptr->gmrId = bo->mem.start;
288 ptr->offset = 0;
294 * vmw_bo_pin - Pin or unpin a buffer object without moving it.
296 * @bo: The buffer object. Must be reserved.
297 * @pin: Whether to pin or unpin.
300 void vmw_bo_pin(struct ttm_buffer_object *bo, bool pin)
302 struct ttm_place pl;
303 struct ttm_placement placement;
304 uint32_t old_mem_type = bo->mem.mem_type;
305 int ret;
307 lockdep_assert_held(&bo->resv->lock.base);
309 pl.fpfn = 0;
310 pl.lpfn = 0;
311 pl.flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB
312 | TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
313 if (pin)
314 pl.flags |= TTM_PL_FLAG_NO_EVICT;
316 memset(&placement, 0, sizeof(placement));
317 placement.num_placement = 1;
318 placement.placement = &pl;
320 ret = ttm_bo_validate(bo, &placement, false, true);
322 BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);