drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c

   1 /**************************************************************************
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   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
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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
  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_operation_ctx ctx = {interruptible, false };
  51         struct ttm_buffer_object *bo = &buf->base;
  52         int ret;
  53         uint32_t new_flags;
  54
  55         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
  56         if (unlikely(ret != 0))
  57                 return ret;
  58
  59         vmw_execbuf_release_pinned_bo(dev_priv);
  60
  61         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
  62         if (unlikely(ret != 0))
  63                 goto err;
  64
  65         if (buf->pin_count > 0)
  66                 ret = ttm_bo_mem_compat(placement, &bo->mem,
  67                                         &new_flags) == true ? 0 : -EINVAL;
  68         else
  69                 ret = ttm_bo_validate(bo, placement, &ctx);
  70
  71         if (!ret)
  72                 vmw_bo_pin_reserved(buf, true);
  73
  74         ttm_bo_unreserve(bo);
  75
  76 err:
  77         ttm_write_unlock(&dev_priv->reservation_sem);
  78         return ret;
  79 }
  80
  81 /**
  82  * vmw_dmabuf_pin_in_vram_or_gmr - Move a buffer to vram or gmr.
  83  *
  84  * This function takes the reservation_sem in write mode.
  85  * Flushes and unpins the query bo to avoid failures.
  86  *
  87  * @dev_priv:  Driver private.
  88  * @buf:  DMA buffer to move.
  89  * @pin:  Pin buffer if true.
  90  * @interruptible:  Use interruptible wait.
  91  *
  92  * Returns
  93  * -ERESTARTSYS if interrupted by a signal.
  94  */
  95 int vmw_dmabuf_pin_in_vram_or_gmr(struct vmw_private *dev_priv,
  96                                   struct vmw_dma_buffer *buf,
  97                                   bool interruptible)
  98 {
  99         struct ttm_operation_ctx ctx = {interruptible, false };
 100         struct ttm_buffer_object *bo = &buf->base;
 101         int ret;
 102         uint32_t new_flags;
 103
 104         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
 105         if (unlikely(ret != 0))
 106                 return ret;
 107
 108         vmw_execbuf_release_pinned_bo(dev_priv);
 109
 110         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 111         if (unlikely(ret != 0))
 112                 goto err;
 113
 114         if (buf->pin_count > 0) {
 115                 ret = ttm_bo_mem_compat(&vmw_vram_gmr_placement, &bo->mem,
 116                                         &new_flags) == true ? 0 : -EINVAL;
 117                 goto out_unreserve;
 118         }
 119
 120         ret = ttm_bo_validate(bo, &vmw_vram_gmr_placement, &ctx);
 121         if (likely(ret == 0) || ret == -ERESTARTSYS)
 122                 goto out_unreserve;
 123
 124         ret = ttm_bo_validate(bo, &vmw_vram_placement, &ctx);
 125
 126 out_unreserve:
 127         if (!ret)
 128                 vmw_bo_pin_reserved(buf, true);
 129
 130         ttm_bo_unreserve(bo);
 131 err:
 132         ttm_write_unlock(&dev_priv->reservation_sem);
 133         return ret;
 134 }
 135
 136 /**
 137  * vmw_dmabuf_pin_in_vram - Move a buffer to vram.
 138  *
 139  * This function takes the reservation_sem in write mode.
 140  * Flushes and unpins the query bo to avoid failures.
 141  *
 142  * @dev_priv:  Driver private.
 143  * @buf:  DMA buffer to move.
 144  * @interruptible:  Use interruptible wait.
 145  *
 146  * Returns
 147  * -ERESTARTSYS if interrupted by a signal.
 148  */
 149 int vmw_dmabuf_pin_in_vram(struct vmw_private *dev_priv,
 150                            struct vmw_dma_buffer *buf,
 151                            bool interruptible)
 152 {
 153         return vmw_dmabuf_pin_in_placement(dev_priv, buf, &vmw_vram_placement,
 154                                            interruptible);
 155 }
 156
 157 /**
 158  * vmw_dmabuf_pin_in_start_of_vram - Move a buffer to start of vram.
 159  *
 160  * This function takes the reservation_sem in write mode.
 161  * Flushes and unpins the query bo to avoid failures.
 162  *
 163  * @dev_priv:  Driver private.
 164  * @buf:  DMA buffer to pin.
 165  * @interruptible:  Use interruptible wait.
 166  *
 167  * Returns
 168  * -ERESTARTSYS if interrupted by a signal.
 169  */
 170 int vmw_dmabuf_pin_in_start_of_vram(struct vmw_private *dev_priv,
 171                                     struct vmw_dma_buffer *buf,
 172                                     bool interruptible)
 173 {
 174         struct ttm_operation_ctx ctx = {interruptible, false };
 175         struct ttm_buffer_object *bo = &buf->base;
 176         struct ttm_placement placement;
 177         struct ttm_place place;
 178         int ret = 0;
 179         uint32_t new_flags;
 180
 181         place = vmw_vram_placement.placement[0];
 182         place.lpfn = bo->num_pages;
 183         placement.num_placement = 1;
 184         placement.placement = &place;
 185         placement.num_busy_placement = 1;
 186         placement.busy_placement = &place;
 187
 188         ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
 189         if (unlikely(ret != 0))
 190                 return ret;
 191
 192         vmw_execbuf_release_pinned_bo(dev_priv);
 193         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 194         if (unlikely(ret != 0))
 195                 goto err_unlock;
 196
 197         /*
 198          * Is this buffer already in vram but not at the start of it?
 199          * In that case, evict it first because TTM isn't good at handling
 200          * that situation.
 201          */
 202         if (bo->mem.mem_type == TTM_PL_VRAM &&
 203             bo->mem.start < bo->num_pages &&
 204             bo->mem.start > 0 &&
 205             buf->pin_count == 0) {
 206                 ctx.interruptible = false;
 207                 (void) ttm_bo_validate(bo, &vmw_sys_placement, &ctx);
 208         }
 209
 210         if (buf->pin_count > 0)
 211                 ret = ttm_bo_mem_compat(&placement, &bo->mem,
 212                                         &new_flags) == true ? 0 : -EINVAL;
 213         else
 214                 ret = ttm_bo_validate(bo, &placement, &ctx);
 215
 216         /* For some reason we didn't end up at the start of vram */
 217         WARN_ON(ret == 0 && bo->offset != 0);
 218         if (!ret)
 219                 vmw_bo_pin_reserved(buf, true);
 220
 221         ttm_bo_unreserve(bo);
 222 err_unlock:
 223         ttm_write_unlock(&dev_priv->reservation_sem);
 224
 225         return ret;
 226 }
 227
 228 /**
 229  * vmw_dmabuf_unpin - Unpin the buffer given buffer, does not move the buffer.
 230  *
 231  * This function takes the reservation_sem in write mode.
 232  *
 233  * @dev_priv:  Driver private.
 234  * @buf:  DMA buffer to unpin.
 235  * @interruptible:  Use interruptible wait.
 236  *
 237  * Returns
 238  * -ERESTARTSYS if interrupted by a signal.
 239  */
 240 int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
 241                      struct vmw_dma_buffer *buf,
 242                      bool interruptible)
 243 {
 244         struct ttm_buffer_object *bo = &buf->base;
 245         int ret;
 246
 247         ret = ttm_read_lock(&dev_priv->reservation_sem, interruptible);
 248         if (unlikely(ret != 0))
 249                 return ret;
 250
 251         ret = ttm_bo_reserve(bo, interruptible, false, NULL);
 252         if (unlikely(ret != 0))
 253                 goto err;
 254
 255         vmw_bo_pin_reserved(buf, false);
 256
 257         ttm_bo_unreserve(bo);
 258
 259 err:
 260         ttm_read_unlock(&dev_priv->reservation_sem);
 261         return ret;
 262 }
 263
 264 /**
 265  * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
 266  * of a buffer.
 267  *
 268  * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
 269  * @ptr: SVGAGuestPtr returning the result.
 270  */
 271 void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
 272                           SVGAGuestPtr *ptr)
 273 {
 274         if (bo->mem.mem_type == TTM_PL_VRAM) {
 275                 ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
 276                 ptr->offset = bo->offset;
 277         } else {
 278                 ptr->gmrId = bo->mem.start;
 279                 ptr->offset = 0;
 280         }
 281 }
 282
 283
 284 /**
 285  * vmw_bo_pin_reserved - Pin or unpin a buffer object without moving it.
 286  *
 287  * @vbo: The buffer object. Must be reserved.
 288  * @pin: Whether to pin or unpin.
 289  *
 290  */
 291 void vmw_bo_pin_reserved(struct vmw_dma_buffer *vbo, bool pin)
 292 {
 293         struct ttm_operation_ctx ctx = { false, true };
 294         struct ttm_place pl;
 295         struct ttm_placement placement;
 296         struct ttm_buffer_object *bo = &vbo->base;
 297         uint32_t old_mem_type = bo->mem.mem_type;
 298         int ret;
 299
 300         lockdep_assert_held(&bo->resv->lock.base);
 301
 302         if (pin) {
 303                 if (vbo->pin_count++ > 0)
 304                         return;
 305         } else {
 306                 WARN_ON(vbo->pin_count <= 0);
 307                 if (--vbo->pin_count > 0)
 308                         return;
 309         }
 310
 311         pl.fpfn = 0;
 312         pl.lpfn = 0;
 313         pl.flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB
 314                 | TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
 315         if (pin)
 316                 pl.flags |= TTM_PL_FLAG_NO_EVICT;
 317
 318         memset(&placement, 0, sizeof(placement));
 319         placement.num_placement = 1;
 320         placement.placement = &pl;
 321
 322         ret = ttm_bo_validate(bo, &placement, &ctx);
 323
 324         BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
 325 }