vmwgfx_dmabuf.c

Go to the documentation of this file.

/**************************************************************************
 *
 * 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"


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, false, 0);

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

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

    ttm_bo_unreserve(bo);

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

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, false, 0);

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

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

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


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

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

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

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);
}

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, false, 0);

    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, false);

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


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);
}


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;
    }
}


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;

    BUG_ON(!atomic_read(&bo->reserved));
    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, true);

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