drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c

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  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.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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  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_pin_in_placement - Validate a buffer to placement.
  36  *
  37  * @dev_priv:  Driver private.
  38  * @buf:  DMA buffer to move.
  39  * @placement:  The placement to pin it.
  40  * @interruptible:  Use interruptible wait.
  41  *
  42  * Returns
  43  *  -ERESTARTSYS if interrupted by a signal.
  44  */
  45 int vmw_dmabuf_pin_in_placement(struct vmw_private *dev_priv,
  46                                 struct vmw_dma_buffer *buf,
  47                                 struct ttm_placement *placement,
  48                                 bool interruptible)
  49 {
  50         struct ttm_buffer_object *bo = &buf->base;
  51         int ret;
  52
  53         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
  54         if (unlikely(ret != 0))
  55                 return ret;
  56
  57         vmw_execbuf_release_pinned_bo(dev_priv);
  58
  59         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
  60         if (unlikely(ret != 0))
  61                 goto err;
  62
  63         ret = ttm_bo_validate(bo, placement, interruptible, false);
  64         if (!ret)
  65                 vmw_bo_pin_reserved(buf, true);
  66
  67         ttm_bo_unreserve(bo);
  68
  69 err:
  70         ttm_write_unlock(&dev_priv->reservation_sem);
  71         return ret;
  72 }
  73
  74 /**
  75  * vmw_dmabuf_pin_in_vram_or_gmr - Move a buffer to vram or gmr.
  76  *
  77  * This function takes the reservation_sem in write mode.
  78  * Flushes and unpins the query bo to avoid failures.
  79  *
  80  * @dev_priv:  Driver private.
  81  * @buf:  DMA buffer to move.
  82  * @pin:  Pin buffer if true.
  83  * @interruptible:  Use interruptible wait.
  84  *
  85  * Returns
  86  * -ERESTARTSYS if interrupted by a signal.
  87  */
  88 int vmw_dmabuf_pin_in_vram_or_gmr(struct vmw_private *dev_priv,
  89                                   struct vmw_dma_buffer *buf,
  90                                   bool interruptible)
  91 {
  92         struct ttm_buffer_object *bo = &buf->base;
  93         int ret;
  94
  95         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
  96         if (unlikely(ret != 0))
  97                 return ret;
  98
  99         vmw_execbuf_release_pinned_bo(dev_priv);
 100
 101         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 102         if (unlikely(ret != 0))
 103                 goto err;
 104
 105         ret = ttm_bo_validate(bo, &vmw_vram_gmr_placement, interruptible,
 106                               false);
 107         if (likely(ret == 0) || ret == -ERESTARTSYS)
 108                 goto out_unreserve;
 109
 110         ret = ttm_bo_validate(bo, &vmw_vram_placement, interruptible, false);
 111
 112 out_unreserve:
 113         if (!ret)
 114                 vmw_bo_pin_reserved(buf, true);
 115
 116         ttm_bo_unreserve(bo);
 117 err:
 118         ttm_write_unlock(&dev_priv->reservation_sem);
 119         return ret;
 120 }
 121
 122 /**
 123  * vmw_dmabuf_pin_in_vram - Move a buffer to vram.
 124  *
 125  * This function takes the reservation_sem in write mode.
 126  * Flushes and unpins the query bo to avoid failures.
 127  *
 128  * @dev_priv:  Driver private.
 129  * @buf:  DMA buffer to move.
 130  * @interruptible:  Use interruptible wait.
 131  *
 132  * Returns
 133  * -ERESTARTSYS if interrupted by a signal.
 134  */
 135 int vmw_dmabuf_pin_in_vram(struct vmw_private *dev_priv,
 136                            struct vmw_dma_buffer *buf,
 137                            bool interruptible)
 138 {
 139         return vmw_dmabuf_pin_in_placement(dev_priv, buf, &vmw_vram_placement,
 140                                            interruptible);
 141 }
 142
 143 /**
 144  * vmw_dmabuf_pin_in_start_of_vram - Move a buffer to start of vram.
 145  *
 146  * This function takes the reservation_sem in write mode.
 147  * Flushes and unpins the query bo to avoid failures.
 148  *
 149  * @dev_priv:  Driver private.
 150  * @buf:  DMA buffer to pin.
 151  * @interruptible:  Use interruptible wait.
 152  *
 153  * Returns
 154  * -ERESTARTSYS if interrupted by a signal.
 155  */
 156 int vmw_dmabuf_pin_in_start_of_vram(struct vmw_private *dev_priv,
 157                                     struct vmw_dma_buffer *buf,
 158                                     bool interruptible)
 159 {
 160         struct ttm_buffer_object *bo = &buf->base;
 161         struct ttm_placement placement;
 162         struct ttm_place place;
 163         int ret = 0;
 164
 165         place = vmw_vram_placement.placement[0];
 166         place.lpfn = bo->num_pages;
 167         placement.num_placement = 1;
 168         placement.placement = &place;
 169         placement.num_busy_placement = 1;
 170         placement.busy_placement = &place;
 171
 172         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
 173         if (unlikely(ret != 0))
 174                 return ret;
 175
 176         vmw_execbuf_release_pinned_bo(dev_priv);
 177         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 178         if (unlikely(ret != 0))
 179                 goto err_unlock;
 180
 181         /*
 182          * Is this buffer already in vram but not at the start of it?
 183          * In that case, evict it first because TTM isn't good at handling
 184          * that situation.
 185          */
 186         if (bo->mem.mem_type == TTM_PL_VRAM &&
 187             bo->mem.start < bo->num_pages &&
 188             bo->mem.start > 0)
 189                 (void) ttm_bo_validate(bo, &vmw_sys_placement, false, false);
 190
 191         ret = ttm_bo_validate(bo, &placement, interruptible, false);
 192
 193         /* For some reason we didn't end up at the start of vram */
 194         WARN_ON(ret == 0 && bo->offset != 0);
 195         if (!ret)
 196                 vmw_bo_pin_reserved(buf, true);
 197
 198         ttm_bo_unreserve(bo);
 199 err_unlock:
 200         ttm_write_unlock(&dev_priv->reservation_sem);
 201
 202         return ret;
 203 }
 204
 205 /**
 206  * vmw_dmabuf_unpin - Unpin the buffer given buffer, does not move the buffer.
 207  *
 208  * This function takes the reservation_sem in write mode.
 209  *
 210  * @dev_priv:  Driver private.
 211  * @buf:  DMA buffer to unpin.
 212  * @interruptible:  Use interruptible wait.
 213  *
 214  * Returns
 215  * -ERESTARTSYS if interrupted by a signal.
 216  */
 217 int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
 218                      struct vmw_dma_buffer *buf,
 219                      bool interruptible)
 220 {
 221         struct ttm_buffer_object *bo = &buf->base;
 222         int ret;
 223
 224         ret = ttm_read_lock(&dev_priv->reservation_sem, interruptible);
 225         if (unlikely(ret != 0))
 226                 return ret;
 227
 228         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 229         if (unlikely(ret != 0))
 230                 goto err;
 231
 232         vmw_bo_pin_reserved(buf, false);
 233
 234         ttm_bo_unreserve(bo);
 235
 236 err:
 237         ttm_read_unlock(&dev_priv->reservation_sem);
 238         return ret;
 239 }
 240
 241 /**
 242  * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
 243  * of a buffer.
 244  *
 245  * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
 246  * @ptr: SVGAGuestPtr returning the result.
 247  */
 248 void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
 249                           SVGAGuestPtr *ptr)
 250 {
 251         if (bo->mem.mem_type == TTM_PL_VRAM) {
 252                 ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
 253                 ptr->offset = bo->offset;
 254         } else {
 255                 ptr->gmrId = bo->mem.start;
 256                 ptr->offset = 0;
 257         }
 258 }
 259
 260
 261 /**
 262  * vmw_bo_pin_reserved - Pin or unpin a buffer object without moving it.
 263  *
 264  * @vbo: The buffer object. Must be reserved.
 265  * @pin: Whether to pin or unpin.
 266  *
 267  */
 268 void vmw_bo_pin_reserved(struct vmw_dma_buffer *vbo, bool pin)
 269 {
 270         struct ttm_place pl;
 271         struct ttm_placement placement;
 272         struct ttm_buffer_object *bo = &vbo->base;
 273         uint32_t old_mem_type = bo->mem.mem_type;
 274         int ret;
 275
 276         lockdep_assert_held(&bo->resv->lock.base);
 277
 278         if (pin) {
 279                 if (vbo->pin_count++ > 0)
 280                         return;
 281         } else {
 282                 WARN_ON(vbo->pin_count <= 0);
 283                 if (--vbo->pin_count > 0)
 284                         return;
 285         }
 286
 287         pl.fpfn = 0;
 288         pl.lpfn = 0;
 289         pl.flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB
 290                 | TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
 291         if (pin)
 292                 pl.flags |= TTM_PL_FLAG_NO_EVICT;
 293
 294         memset(&placement, 0, sizeof(placement));
 295         placement.num_placement = 1;
 296         placement.placement = &pl;
 297
 298         ret = ttm_bo_validate(bo, &placement, false, true);
 299
 300         BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
 301 }