drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2011 VMware, Inc., Palo Alto, CA., USA
   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
   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:
  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,
  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.
  25  *
  26  **************************************************************************/
  27
  28 #include "ttm/ttm_placement.h"
  29
  30 #include "drmP.h"
  31 #include "vmwgfx_drv.h"
  32
  33
  34 /**
  35  * vmw_dmabuf_to_placement - Validate a buffer to placement.
  36  *
  37  * @dev_priv:  Driver private.
  38  * @buf:  DMA buffer to move.
  39  * @pin:  Pin buffer if true.
  40  * @interruptible:  Use interruptible wait.
  41  *
  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.
  46  *
  47  * Returns
  48  *  -ERESTARTSYS if interrupted by a signal.
  49  */
  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)
  54 {
  55         struct vmw_master *vmaster = dev_priv->active_master;
  56         struct ttm_buffer_object *bo = &buf->base;
  57         int ret;
  58
  59         ret = ttm_write_lock(&vmaster->lock, interruptible);
  60         if (unlikely(ret != 0))
  61                 return ret;
  62
  63         vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
  64
  65         ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
  66         if (unlikely(ret != 0))
  67                 goto err;
  68
  69         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
  70
  71         ttm_bo_unreserve(bo);
  72
  73 err:
  74         ttm_write_unlock(&vmaster->lock);
  75         return ret;
  76 }
  77
  78 /**
  79  * vmw_dmabuf_to_vram_or_gmr - Move a buffer to vram or gmr.
  80  *
  81  * May only be called by the current master since it assumes that the
  82  * master lock is the current master's lock.
  83  * This function takes the master's lock in write mode.
  84  * Flushes and unpins the query bo if @pin == true 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_to_vram_or_gmr(struct vmw_private *dev_priv,
  95                               struct vmw_dma_buffer *buf,
  96                               bool pin, bool interruptible)
  97 {
  98         struct vmw_master *vmaster = dev_priv->active_master;
  99         struct ttm_buffer_object *bo = &buf->base;
 100         struct ttm_placement *placement;
 101         int ret;
 102
 103         ret = ttm_write_lock(&vmaster->lock, interruptible);
 104         if (unlikely(ret != 0))
 105                 return ret;
 106
 107         if (pin)
 108                 vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
 109
 110         ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
 111         if (unlikely(ret != 0))
 112                 goto err;
 113
 114         /**
 115          * Put BO in VRAM if there is space, otherwise as a GMR.
 116          * If there is no space in VRAM and GMR ids are all used up,
 117          * start evicting GMRs to make room. If the DMA buffer can't be
 118          * used as a GMR, this will return -ENOMEM.
 119          */
 120
 121         if (pin)
 122                 placement = &vmw_vram_gmr_ne_placement;
 123         else
 124                 placement = &vmw_vram_gmr_placement;
 125
 126         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
 127         if (likely(ret == 0) || ret == -ERESTARTSYS)
 128                 goto err_unreserve;
 129
 130
 131         /**
 132          * If that failed, try VRAM again, this time evicting
 133          * previous contents.
 134          */
 135
 136         if (pin)
 137                 placement = &vmw_vram_ne_placement;
 138         else
 139                 placement = &vmw_vram_placement;
 140
 141         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
 142
 143 err_unreserve:
 144         ttm_bo_unreserve(bo);
 145 err:
 146         ttm_write_unlock(&vmaster->lock);
 147         return ret;
 148 }
 149
 150 /**
 151  * vmw_dmabuf_to_vram - Move a buffer to vram.
 152  *
 153  * May only be called by the current master since it assumes that the
 154  * master lock is the current master's lock.
 155  * This function takes the master's lock in write mode.
 156  *
 157  * @dev_priv:  Driver private.
 158  * @buf:  DMA buffer to move.
 159  * @pin:  Pin buffer in vram if true.
 160  * @interruptible:  Use interruptible wait.
 161  *
 162  * Returns
 163  * -ERESTARTSYS if interrupted by a signal.
 164  */
 165 int vmw_dmabuf_to_vram(struct vmw_private *dev_priv,
 166                        struct vmw_dma_buffer *buf,
 167                        bool pin, bool interruptible)
 168 {
 169         struct ttm_placement *placement;
 170
 171         if (pin)
 172                 placement = &vmw_vram_ne_placement;
 173         else
 174                 placement = &vmw_vram_placement;
 175
 176         return vmw_dmabuf_to_placement(dev_priv, buf,
 177                                        placement,
 178                                        interruptible);
 179 }
 180
 181 /**
 182  * vmw_dmabuf_to_start_of_vram - Move a buffer to start of vram.
 183  *
 184  * May only be called by the current master since it assumes that the
 185  * master lock is the current master's lock.
 186  * This function takes the master's lock in write mode.
 187  * Flushes and unpins the query bo if @pin == true to avoid failures.
 188  *
 189  * @dev_priv:  Driver private.
 190  * @buf:  DMA buffer to move.
 191  * @pin:  Pin buffer in vram if true.
 192  * @interruptible:  Use interruptible wait.
 193  *
 194  * Returns
 195  * -ERESTARTSYS if interrupted by a signal.
 196  */
 197 int vmw_dmabuf_to_start_of_vram(struct vmw_private *dev_priv,
 198                                 struct vmw_dma_buffer *buf,
 199                                 bool pin, bool interruptible)
 200 {
 201         struct vmw_master *vmaster = dev_priv->active_master;
 202         struct ttm_buffer_object *bo = &buf->base;
 203         struct ttm_placement placement;
 204         int ret = 0;
 205
 206         if (pin)
 207                 placement = vmw_vram_ne_placement;
 208         else
 209                 placement = vmw_vram_placement;
 210         placement.lpfn = bo->num_pages;
 211
 212         ret = ttm_write_lock(&vmaster->lock, interruptible);
 213         if (unlikely(ret != 0))
 214                 return ret;
 215
 216         if (pin)
 217                 vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
 218
 219         ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
 220         if (unlikely(ret != 0))
 221                 goto err_unlock;
 222
 223         /* Is this buffer already in vram but not at the start of it? */
 224         if (bo->mem.mem_type == TTM_PL_VRAM &&
 225             bo->mem.start < bo->num_pages &&
 226             bo->mem.start > 0)
 227                 (void) ttm_bo_validate(bo, &vmw_sys_placement, false,
 228                                        false, false);
 229
 230         ret = ttm_bo_validate(bo, &placement, interruptible, false, false);
 231
 232         /* For some reason we didn't up at the start of vram */
 233         WARN_ON(ret == 0 && bo->offset != 0);
 234
 235         ttm_bo_unreserve(bo);
 236 err_unlock:
 237         ttm_write_unlock(&vmaster->lock);
 238
 239         return ret;
 240 }
 241
 242
 243 /**
 244  * vmw_dmabuf_upin - Unpin the buffer given buffer, does not move the buffer.
 245  *
 246  * May only be called by the current master since it assumes that the
 247  * master lock is the current master's lock.
 248  * This function takes the master's lock in write mode.
 249  *
 250  * @dev_priv:  Driver private.
 251  * @buf:  DMA buffer to unpin.
 252  * @interruptible:  Use interruptible wait.
 253  *
 254  * Returns
 255  * -ERESTARTSYS if interrupted by a signal.
 256  */
 257 int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
 258                      struct vmw_dma_buffer *buf,
 259                      bool interruptible)
 260 {
 261         /*
 262          * We could in theory early out if the buffer is
 263          * unpinned but we need to lock and reserve the buffer
 264          * anyways so we don't gain much by that.
 265          */
 266         return vmw_dmabuf_to_placement(dev_priv, buf,
 267                                        &vmw_evictable_placement,
 268                                        interruptible);
 269 }
 270
 271
 272 /**
 273  * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
 274  * of a buffer.
 275  *
 276  * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
 277  * @ptr: SVGAGuestPtr returning the result.
 278  */
 279 void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
 280                           SVGAGuestPtr *ptr)
 281 {
 282         if (bo->mem.mem_type == TTM_PL_VRAM) {
 283                 ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
 284                 ptr->offset = bo->offset;
 285         } else {
 286                 ptr->gmrId = bo->mem.start;
 287                 ptr->offset = 0;
 288         }
 289 }
 290
 291
 292 /**
 293  * vmw_bo_pin - Pin or unpin a buffer object without moving it.
 294  *
 295  * @bo: The buffer object. Must be reserved, and present either in VRAM
 296  * or GMR memory.
 297  * @pin: Whether to pin or unpin.
 298  *
 299  */
 300 void vmw_bo_pin(struct ttm_buffer_object *bo, bool pin)
 301 {
 302         uint32_t pl_flags;
 303         struct ttm_placement placement;
 304         uint32_t old_mem_type = bo->mem.mem_type;
 305         int ret;
 306
 307         BUG_ON(!atomic_read(&bo->reserved));
 308         BUG_ON(old_mem_type != TTM_PL_VRAM &&
 309                old_mem_type != VMW_PL_FLAG_GMR);
 310
 311         pl_flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED;
 312         if (pin)
 313                 pl_flags |= TTM_PL_FLAG_NO_EVICT;
 314
 315         memset(&placement, 0, sizeof(placement));
 316         placement.num_placement = 1;
 317         placement.placement = &pl_flags;
 318
 319         ret = ttm_bo_validate(bo, &placement, false, true, true);
 320
 321         BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
 322 }