323 lines
8.9 KiB
C
323 lines
8.9 KiB
C
/**************************************************************************
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*
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* Copyright © 2011 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "ttm/ttm_placement.h"
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#include "drmP.h"
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#include "vmwgfx_drv.h"
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/**
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* vmw_dmabuf_to_placement - Validate a buffer to placement.
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*
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* @dev_priv: Driver private.
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* @buf: DMA buffer to move.
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* @pin: Pin buffer if true.
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* @interruptible: Use interruptible wait.
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*
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* May only be called by the current master since it assumes that the
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* master lock is the current master's lock.
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* This function takes the master's lock in write mode.
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* Flushes and unpins the query bo to avoid failures.
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*
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* Returns
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* -ERESTARTSYS if interrupted by a signal.
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*/
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int vmw_dmabuf_to_placement(struct vmw_private *dev_priv,
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struct vmw_dma_buffer *buf,
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struct ttm_placement *placement,
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bool interruptible)
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{
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struct vmw_master *vmaster = dev_priv->active_master;
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struct ttm_buffer_object *bo = &buf->base;
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int ret;
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ret = ttm_write_lock(&vmaster->lock, interruptible);
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if (unlikely(ret != 0))
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return ret;
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vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
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ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
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if (unlikely(ret != 0))
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goto err;
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ret = ttm_bo_validate(bo, placement, interruptible, false, false);
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ttm_bo_unreserve(bo);
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err:
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ttm_write_unlock(&vmaster->lock);
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return ret;
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}
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/**
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* vmw_dmabuf_to_vram_or_gmr - Move a buffer to vram or gmr.
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*
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* May only be called by the current master since it assumes that the
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* master lock is the current master's lock.
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* This function takes the master's lock in write mode.
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* Flushes and unpins the query bo if @pin == true to avoid failures.
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*
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* @dev_priv: Driver private.
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* @buf: DMA buffer to move.
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* @pin: Pin buffer if true.
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* @interruptible: Use interruptible wait.
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*
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* Returns
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* -ERESTARTSYS if interrupted by a signal.
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*/
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int vmw_dmabuf_to_vram_or_gmr(struct vmw_private *dev_priv,
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struct vmw_dma_buffer *buf,
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bool pin, bool interruptible)
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{
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struct vmw_master *vmaster = dev_priv->active_master;
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struct ttm_buffer_object *bo = &buf->base;
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struct ttm_placement *placement;
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int ret;
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ret = ttm_write_lock(&vmaster->lock, interruptible);
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if (unlikely(ret != 0))
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return ret;
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if (pin)
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vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
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ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
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if (unlikely(ret != 0))
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goto err;
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/**
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* Put BO in VRAM if there is space, otherwise as a GMR.
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* If there is no space in VRAM and GMR ids are all used up,
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* start evicting GMRs to make room. If the DMA buffer can't be
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* used as a GMR, this will return -ENOMEM.
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*/
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if (pin)
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placement = &vmw_vram_gmr_ne_placement;
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else
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placement = &vmw_vram_gmr_placement;
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ret = ttm_bo_validate(bo, placement, interruptible, false, false);
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if (likely(ret == 0) || ret == -ERESTARTSYS)
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goto err_unreserve;
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/**
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* If that failed, try VRAM again, this time evicting
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* previous contents.
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*/
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if (pin)
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placement = &vmw_vram_ne_placement;
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else
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placement = &vmw_vram_placement;
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ret = ttm_bo_validate(bo, placement, interruptible, false, false);
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err_unreserve:
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ttm_bo_unreserve(bo);
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err:
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ttm_write_unlock(&vmaster->lock);
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return ret;
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}
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/**
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* vmw_dmabuf_to_vram - Move a buffer to vram.
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*
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* May only be called by the current master since it assumes that the
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* master lock is the current master's lock.
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* This function takes the master's lock in write mode.
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*
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* @dev_priv: Driver private.
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* @buf: DMA buffer to move.
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* @pin: Pin buffer in vram if true.
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* @interruptible: Use interruptible wait.
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*
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* Returns
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* -ERESTARTSYS if interrupted by a signal.
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*/
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int vmw_dmabuf_to_vram(struct vmw_private *dev_priv,
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struct vmw_dma_buffer *buf,
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bool pin, bool interruptible)
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{
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struct ttm_placement *placement;
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if (pin)
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placement = &vmw_vram_ne_placement;
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else
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placement = &vmw_vram_placement;
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return vmw_dmabuf_to_placement(dev_priv, buf,
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placement,
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interruptible);
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}
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/**
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* vmw_dmabuf_to_start_of_vram - Move a buffer to start of vram.
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*
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* May only be called by the current master since it assumes that the
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* master lock is the current master's lock.
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* This function takes the master's lock in write mode.
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* Flushes and unpins the query bo if @pin == true to avoid failures.
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*
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* @dev_priv: Driver private.
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* @buf: DMA buffer to move.
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* @pin: Pin buffer in vram if true.
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* @interruptible: Use interruptible wait.
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*
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* Returns
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* -ERESTARTSYS if interrupted by a signal.
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*/
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int vmw_dmabuf_to_start_of_vram(struct vmw_private *dev_priv,
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struct vmw_dma_buffer *buf,
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bool pin, bool interruptible)
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{
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struct vmw_master *vmaster = dev_priv->active_master;
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struct ttm_buffer_object *bo = &buf->base;
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struct ttm_placement placement;
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int ret = 0;
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if (pin)
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placement = vmw_vram_ne_placement;
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else
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placement = vmw_vram_placement;
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placement.lpfn = bo->num_pages;
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ret = ttm_write_lock(&vmaster->lock, interruptible);
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if (unlikely(ret != 0))
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return ret;
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if (pin)
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vmw_execbuf_release_pinned_bo(dev_priv, false, 0);
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ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
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if (unlikely(ret != 0))
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goto err_unlock;
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/* Is this buffer already in vram but not at the start of it? */
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if (bo->mem.mem_type == TTM_PL_VRAM &&
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bo->mem.start < bo->num_pages &&
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bo->mem.start > 0)
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(void) ttm_bo_validate(bo, &vmw_sys_placement, false,
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false, false);
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ret = ttm_bo_validate(bo, &placement, interruptible, false, false);
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/* For some reason we didn't up at the start of vram */
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WARN_ON(ret == 0 && bo->offset != 0);
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ttm_bo_unreserve(bo);
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err_unlock:
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ttm_write_unlock(&vmaster->lock);
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return ret;
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}
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/**
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* vmw_dmabuf_upin - Unpin the buffer given buffer, does not move the buffer.
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*
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* May only be called by the current master since it assumes that the
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* master lock is the current master's lock.
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* This function takes the master's lock in write mode.
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*
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* @dev_priv: Driver private.
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* @buf: DMA buffer to unpin.
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* @interruptible: Use interruptible wait.
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*
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* Returns
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* -ERESTARTSYS if interrupted by a signal.
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*/
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int vmw_dmabuf_unpin(struct vmw_private *dev_priv,
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struct vmw_dma_buffer *buf,
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bool interruptible)
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{
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/*
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* We could in theory early out if the buffer is
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* unpinned but we need to lock and reserve the buffer
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* anyways so we don't gain much by that.
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*/
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return vmw_dmabuf_to_placement(dev_priv, buf,
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&vmw_evictable_placement,
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interruptible);
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}
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/**
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* vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
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* of a buffer.
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*
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* @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
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* @ptr: SVGAGuestPtr returning the result.
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*/
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void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
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SVGAGuestPtr *ptr)
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{
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if (bo->mem.mem_type == TTM_PL_VRAM) {
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ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
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ptr->offset = bo->offset;
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} else {
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ptr->gmrId = bo->mem.start;
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ptr->offset = 0;
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}
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}
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/**
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* vmw_bo_pin - Pin or unpin a buffer object without moving it.
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*
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* @bo: The buffer object. Must be reserved, and present either in VRAM
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* or GMR memory.
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* @pin: Whether to pin or unpin.
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*
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*/
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void vmw_bo_pin(struct ttm_buffer_object *bo, bool pin)
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{
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uint32_t pl_flags;
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struct ttm_placement placement;
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uint32_t old_mem_type = bo->mem.mem_type;
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int ret;
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BUG_ON(!atomic_read(&bo->reserved));
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BUG_ON(old_mem_type != TTM_PL_VRAM &&
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old_mem_type != VMW_PL_FLAG_GMR);
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pl_flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED;
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if (pin)
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pl_flags |= TTM_PL_FLAG_NO_EVICT;
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memset(&placement, 0, sizeof(placement));
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placement.num_placement = 1;
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placement.placement = &pl_flags;
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ret = ttm_bo_validate(bo, &placement, false, true, true);
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BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
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}
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