aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c
blob: d4e54fcc0acd3e778bd74d1488f898798c740c73 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/**************************************************************************
 *
 * Copyright © 2011 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS 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 <drm/ttm/ttm_placement.h>

#include <drm/drmP.h>
#include "vmwgfx_drv.h"


/**
 * vmw_dmabuf_to_placement - Validate a buffer to placement.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @pin:  Pin buffer if true.
 * @interruptible:  Use interruptible wait.
 *
 * May only be called by the current master since it assumes that the
 * master lock is the current master's lock.
 * This function takes the master's lock in write mode.
 * Flushes and unpins the query bo to avoid failures.
 *
 * Returns
 *  -ERESTARTSYS if interrupted by a signal.
 */
int vmw_dmabuf_to_placement(struct vmw_private *dev_priv,
			    struct vmw_dma_buffer *buf,
			    struct ttm_placement *placement,
			    bool interruptible)
{
	struct vmw_master *vmaster = dev_priv->active_master;
	struct ttm_buffer_object *bo = &buf->base;
	int ret;

	ret = ttm_write_lock(&vmaster->lock, interruptible);
	if (unlikely(ret != 0))
		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
	if (unlikely(ret != 0))
		goto err;

	ret = ttm_bo_validate(bo, placement, interruptible, false);

	ttm_bo_unreserve(bo);

err:
	ttm_write_unlock(&vmaster->lock);
	return ret;
}

/**
 * vmw_dmabuf_to_vram_or_gmr - Move a buffer to vram or gmr.
 *
 * May only be called by the current master since it assumes that the
 * master lock is the current master's lock.
 * This function takes the master's lock in write mode.
 * Flushes and unpins the query bo if @pin == true to avoid failures.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @pin:  Pin buffer if true.
 * @interruptible:  Use interruptible wait.
 *
 * Returns
 * -ERESTARTSYS if interrupted by a signal.
 */
int vmw_dmabuf_to_vram_or_gmr(struct vmw_private *dev_priv,
			      struct vmw_dma_buffer *buf,
			      bool pin, bool interruptible)
{
	struct vmw_master *vmaster = dev_priv->active_master;
	struct ttm_buffer_object *bo = &buf->base;
	struct ttm_placement *placement;
	int ret;

	ret = ttm_write_lock(&vmaster->lock, interruptible);
	if (unlikely(ret != 0))
		return ret;

	if (pin)
		vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
	if (unlikely(ret != 0))
		goto err;

	/**
	 * Put BO in VRAM if there is space, otherwise as a GMR.
	 * If there is no space in VRAM and GMR ids are all used up,
	 * start evicting GMRs to make room. If the DMA buffer can't be
	 * used as a GMR, this will return -ENOMEM.
	 */

	if (pin)
		placement = &vmw_vram_gmr_ne_placement;
	else
		placement = &vmw_vram_gmr_placement;

	ret = ttm_bo_validate(bo, placement, interruptible, false);
	if (likely(ret == 0) || ret == -ERESTARTSYS)
		goto err_unreserve;


	/**
	 * If that failed, try VRAM again, this time evicting
	 * previous contents.
	 */

	if (pin)
		placement = &vmw_vram_ne_placement;
	else
		placement = &vmw_vram_placement;

	ret = ttm_bo_validate(bo, placement, interruptible, false);

err_unreserve:
	ttm_bo_unreserve(bo);
err:
	ttm_write_unlock(&vmaster->lock);
	return ret;
}

/**
 * vmw_dmabuf_to_vram - Move a buffer to vram.
 *
 * May only be called by the current master since it assumes that the
 * master lock is the current master's lock.
 * This function takes the master's lock in write mode.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @pin:  Pin buffer in vram if true.
 * @interruptible:  Use interruptible wait.
 *
 * Returns
 * -ERESTARTSYS if interrupted by a signal.
 */
int vmw_dmabuf_to_vram(struct vmw_private *dev_priv,
		       struct vmw_dma_buffer *buf,
		       bool pin, bool interruptible)
{
	struct ttm_placement *placement;

	if (pin)
		placement = &vmw_vram_ne_placement;
	else
		placement = &vmw_vram_placement;

	return vmw_dmabuf_to_placement(dev_priv, buf,
				       placement,
				       interruptible);
}

/**
 * vmw_dmabuf_to_start_of_vram - Move a buffer to start of vram.
 *
 * May only be called by the current master since it assumes that the
 * master lock is the current master's lock.
 * This function takes the master's lock in write mode.
 * Flushes and unpins the query bo if @pin == true to avoid failures.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @pin:  Pin buffer in vram if true.
 * @interruptible:  Use interruptible wait.
 *
 * Returns
 * -ERESTARTSYS if interrupted by a signal.
 */
int vmw_dmabuf_to_start_of_vram(struct vmw_private *dev_priv,
				struct vmw_dma_buffer *buf,
				bool pin, bool interruptible)
{
	struct vmw_master *vmaster = dev_priv->active_master;
	struct ttm_buffer_object *bo = &buf->base;
	struct ttm_placement placement;
	int ret = 0;

	if (pin)
		placement = vmw_vram_ne_placement;
	else
		placement = vmw_vram_placement;
	placement.lpfn = bo->num_pages;

	ret = ttm_write_lock(&vmaster->lock, interruptible);
	if (unlikely(ret != 0))
		return ret;

	if (pin)
		vmw_execbuf_release_pinned_bo(dev_priv);
	ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
	if (unlikely(ret != 0))
		goto err_unlock;

	/* Is this buffer already in vram but not at the start of it? */
	if (bo->mem.mem_type == TTM_PL_VRAM &&
	    bo->mem.start < bo->num_pages &&
	    bo->mem.start > 0)
		(void) ttm_bo_validate(bo, &vmw_sys_placement, false, false);

	ret = ttm_bo_validate(bo, &placement, interruptible, false);

	/* For some reason we didn't up at the start of vram */
	WARN_ON(ret == 0 && bo->offset != 0);

	ttm_bo_unreserve(bo);
err_unlock:
	ttm_write_unlock(&vmaster->lock);

	return ret;
}


/**
 * vmw_dmabuf_upin - Unpin the buffer given buffer, does not move the buffer.
 *
 * May only be called by the current master since it assumes that the
 * master lock is the current master's lock.
 * This function takes the master's lock in write mode.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to unpin.
 * @interruptible:  Use interruptible wait.
 *
 * Returns
 * -ERESTARTSYS if interrupted by a signal.
 */
int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
		     struct vmw_dma_buffer *buf,
		     bool interruptible)
{
	/*
	 * We could in theory early out if the buffer is
	 * unpinned but we need to lock and reserve the buffer
	 * anyways so we don't gain much by that.
	 */
	return vmw_dmabuf_to_placement(dev_priv, buf,
				       &vmw_evictable_placement,
				       interruptible);
}


/**
 * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
 * of a buffer.
 *
 * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
 * @ptr: SVGAGuestPtr returning the result.
 */
void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
			  SVGAGuestPtr *ptr)
{
	if (bo->mem.mem_type == TTM_PL_VRAM) {
		ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
		ptr->offset = bo->offset;
	} else {
		ptr->gmrId = bo->mem.start;
		ptr->offset = 0;
	}
}


/**
 * vmw_bo_pin - Pin or unpin a buffer object without moving it.
 *
 * @bo: The buffer object. Must be reserved, and present either in VRAM
 * or GMR memory.
 * @pin: Whether to pin or unpin.
 *
 */
void vmw_bo_pin(struct ttm_buffer_object *bo, bool pin)
{
	uint32_t pl_flags;
	struct ttm_placement placement;
	uint32_t old_mem_type = bo->mem.mem_type;
	int ret;

	lockdep_assert_held(&bo->resv->lock.base);
	BUG_ON(old_mem_type != TTM_PL_VRAM &&
	       old_mem_type != VMW_PL_GMR);

	pl_flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED;
	if (pin)
		pl_flags |= TTM_PL_FLAG_NO_EVICT;

	memset(&placement, 0, sizeof(placement));
	placement.num_placement = 1;
	placement.placement = &pl_flags;

	ret = ttm_bo_validate(bo, &placement, false, true);

	BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
}