drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c

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   7  * copy of this software and associated documentation files (the
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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.
  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,
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  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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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         uint32_t new_flags;
  53
  54         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
  55         if (unlikely(ret != 0))
  56                 return ret;
  57
  58         vmw_execbuf_release_pinned_bo(dev_priv);
  59
  60         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
  61         if (unlikely(ret != 0))
  62                 goto err;
  63
  64         if (buf->pin_count > 0)
  65                 ret = ttm_bo_mem_compat(placement, &bo->mem,
  66                                         &new_flags) == true ? 0 : -EINVAL;
  67         else
  68                 ret = ttm_bo_validate(bo, placement, interruptible, false);
  69
  70         if (!ret)
  71                 vmw_bo_pin_reserved(buf, true);
  72
  73         ttm_bo_unreserve(bo);
  74
  75 err:
  76         ttm_write_unlock(&dev_priv->reservation_sem);
  77         return ret;
  78 }
  79
  80 /**
  81  * vmw_dmabuf_pin_in_vram_or_gmr - Move a buffer to vram or gmr.
  82  *
  83  * This function takes the reservation_sem in write mode.
  84  * Flushes and unpins the query bo 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  */
  94 int vmw_dmabuf_pin_in_vram_or_gmr(struct vmw_private *dev_priv,
  95                                   struct vmw_dma_buffer *buf,
  96                                   bool interruptible)
  97 {
  98         struct ttm_buffer_object *bo = &buf->base;
  99         int ret;
 100         uint32_t new_flags;
 101
 102         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
 103         if (unlikely(ret != 0))
 104                 return ret;
 105
 106         vmw_execbuf_release_pinned_bo(dev_priv);
 107
 108         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 109         if (unlikely(ret != 0))
 110                 goto err;
 111
 112         if (buf->pin_count > 0) {
 113                 ret = ttm_bo_mem_compat(&vmw_vram_gmr_placement, &bo->mem,
 114                                         &new_flags) == true ? 0 : -EINVAL;
 115                 goto out_unreserve;
 116         }
 117
 118         ret = ttm_bo_validate(bo, &vmw_vram_gmr_placement, interruptible,
 119                               false);
 120         if (likely(ret == 0) || ret == -ERESTARTSYS)
 121                 goto out_unreserve;
 122
 123         ret = ttm_bo_validate(bo, &vmw_vram_placement, interruptible, false);
 124
 125 out_unreserve:
 126         if (!ret)
 127                 vmw_bo_pin_reserved(buf, true);
 128
 129         ttm_bo_unreserve(bo);
 130 err:
 131         ttm_write_unlock(&dev_priv->reservation_sem);
 132         return ret;
 133 }
 134
 135 /**
 136  * vmw_dmabuf_pin_in_vram - Move a buffer to vram.
 137  *
 138  * This function takes the reservation_sem in write mode.
 139  * Flushes and unpins the query bo to avoid failures.
 140  *
 141  * @dev_priv:  Driver private.
 142  * @buf:  DMA buffer to move.
 143  * @interruptible:  Use interruptible wait.
 144  *
 145  * Returns
 146  * -ERESTARTSYS if interrupted by a signal.
 147  */
 148 int vmw_dmabuf_pin_in_vram(struct vmw_private *dev_priv,
 149                            struct vmw_dma_buffer *buf,
 150                            bool interruptible)
 151 {
 152         return vmw_dmabuf_pin_in_placement(dev_priv, buf, &vmw_vram_placement,
 153                                            interruptible);
 154 }
 155
 156 /**
 157  * vmw_dmabuf_pin_in_start_of_vram - Move a buffer to start of vram.
 158  *
 159  * This function takes the reservation_sem in write mode.
 160  * Flushes and unpins the query bo to avoid failures.
 161  *
 162  * @dev_priv:  Driver private.
 163  * @buf:  DMA buffer to pin.
 164  * @interruptible:  Use interruptible wait.
 165  *
 166  * Returns
 167  * -ERESTARTSYS if interrupted by a signal.
 168  */
 169 int vmw_dmabuf_pin_in_start_of_vram(struct vmw_private *dev_priv,
 170                                     struct vmw_dma_buffer *buf,
 171                                     bool interruptible)
 172 {
 173         struct ttm_buffer_object *bo = &buf->base;
 174         struct ttm_placement placement;
 175         struct ttm_place place;
 176         int ret = 0;
 177         uint32_t new_flags;
 178
 179         place = vmw_vram_placement.placement[0];
 180         place.lpfn = bo->num_pages;
 181         placement.num_placement = 1;
 182         placement.placement = &place;
 183         placement.num_busy_placement = 1;
 184         placement.busy_placement = &place;
 185
 186         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
 187         if (unlikely(ret != 0))
 188                 return ret;
 189
 190         vmw_execbuf_release_pinned_bo(dev_priv);
 191         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 192         if (unlikely(ret != 0))
 193                 goto err_unlock;
 194
 195         /*
 196          * Is this buffer already in vram but not at the start of it?
 197          * In that case, evict it first because TTM isn't good at handling
 198          * that situation.
 199          */
 200         if (bo->mem.mem_type == TTM_PL_VRAM &&
 201             bo->mem.start < bo->num_pages &&
 202             bo->mem.start > 0 &&
 203             buf->pin_count == 0)
 204                 (void) ttm_bo_validate(bo, &vmw_sys_placement, false, false);
 205
 206         if (buf->pin_count > 0)
 207                 ret = ttm_bo_mem_compat(&placement, &bo->mem,
 208                                         &new_flags) == true ? 0 : -EINVAL;
 209         else
 210                 ret = ttm_bo_validate(bo, &placement, interruptible, false);
 211
 212         /* For some reason we didn't end up at the start of vram */
 213         WARN_ON(ret == 0 && bo->offset != 0);
 214         if (!ret)
 215                 vmw_bo_pin_reserved(buf, true);
 216
 217         ttm_bo_unreserve(bo);
 218 err_unlock:
 219         ttm_write_unlock(&dev_priv->reservation_sem);
 220
 221         return ret;
 222 }
 223
 224 /**
 225  * vmw_dmabuf_unpin - Unpin the buffer given buffer, does not move the buffer.
 226  *
 227  * This function takes the reservation_sem in write mode.
 228  *
 229  * @dev_priv:  Driver private.
 230  * @buf:  DMA buffer to unpin.
 231  * @interruptible:  Use interruptible wait.
 232  *
 233  * Returns
 234  * -ERESTARTSYS if interrupted by a signal.
 235  */
 236 int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
 237                      struct vmw_dma_buffer *buf,
 238                      bool interruptible)
 239 {
 240         struct ttm_buffer_object *bo = &buf->base;
 241         int ret;
 242
 243         ret = ttm_read_lock(&dev_priv->reservation_sem, interruptible);
 244         if (unlikely(ret != 0))
 245                 return ret;
 246
 247         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 248         if (unlikely(ret != 0))
 249                 goto err;
 250
 251         vmw_bo_pin_reserved(buf, false);
 252
 253         ttm_bo_unreserve(bo);
 254
 255 err:
 256         ttm_read_unlock(&dev_priv->reservation_sem);
 257         return ret;
 258 }
 259
 260 /**
 261  * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
 262  * of a buffer.
 263  *
 264  * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
 265  * @ptr: SVGAGuestPtr returning the result.
 266  */
 267 void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
 268                           SVGAGuestPtr *ptr)
 269 {
 270         if (bo->mem.mem_type == TTM_PL_VRAM) {
 271                 ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
 272                 ptr->offset = bo->offset;
 273         } else {
 274                 ptr->gmrId = bo->mem.start;
 275                 ptr->offset = 0;
 276         }
 277 }
 278
 279
 280 /**
 281  * vmw_bo_pin_reserved - Pin or unpin a buffer object without moving it.
 282  *
 283  * @vbo: The buffer object. Must be reserved.
 284  * @pin: Whether to pin or unpin.
 285  *
 286  */
 287 void vmw_bo_pin_reserved(struct vmw_dma_buffer *vbo, bool pin)
 288 {
 289         struct ttm_place pl;
 290         struct ttm_placement placement;
 291         struct ttm_buffer_object *bo = &vbo->base;
 292         uint32_t old_mem_type = bo->mem.mem_type;
 293         int ret;
 294
 295         lockdep_assert_held(&bo->resv->lock.base);
 296
 297         if (pin) {
 298                 if (vbo->pin_count++ > 0)
 299                         return;
 300         } else {
 301                 WARN_ON(vbo->pin_count <= 0);
 302                 if (--vbo->pin_count > 0)
 303                         return;
 304         }
 305
 306         pl.fpfn = 0;
 307         pl.lpfn = 0;
 308         pl.flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB
 309                 | TTM_PL_FLAG_SYSTEM | 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;
 316
 317         ret = ttm_bo_validate(bo, &placement, false, true);
 318
 319         BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
 320 }