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+/**************************************************************************
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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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+
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+#include "ttm/ttm_placement.h"
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+
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+#include "drmP.h"
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+#include "vmwgfx_drv.h"
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+
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+
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+/**
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+ * Validate a buffer to placement.
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+ *
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+ * May only be called by the current master as this function takes the
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+ * its lock in write mode.
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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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+
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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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+
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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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+ ret = ttm_bo_validate(bo, placement, interruptible, false, false);
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+
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+ ttm_bo_unreserve(bo);
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+
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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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+/**
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+ * Move a buffer to vram or gmr.
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+ *
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+ * May only be called by the current master as this function takes the
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+ * its 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 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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+
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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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+
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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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+ /**
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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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+
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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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+
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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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+
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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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+
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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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+
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+ ret = ttm_bo_validate(bo, placement, interruptible, false, false);
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+
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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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+/**
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+ * Move a buffer to vram.
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+ *
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+ * May only be called by the current master as this function takes the
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+ * its 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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+
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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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+
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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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+/**
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+ * Move a buffer to start of vram.
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+ *
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+ * May only be called by the current master as this function takes the
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+ * its 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_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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+
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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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+
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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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+
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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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+
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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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+
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+ ret = ttm_bo_validate(bo, &placement, interruptible, false, false);
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+
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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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+
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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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+
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+ return ret;
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+}
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+
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+/**
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+ * 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 as this function takes the
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+ * its 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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+/**
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+ * Move a buffer to system memory, does not pin the buffer.
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+ *
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+ * May only be called by the current master as this function takes the
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+ * its 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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+ * @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_system(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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+ return vmw_dmabuf_to_placement(dev_priv, buf,
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+ &vmw_sys_placement,
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+ interruptible);
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+}
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+
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+void vmw_dmabuf_get_id_offset(struct vmw_dma_buffer *buf,
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+ uint32_t *gmrId, uint32_t *offset)
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+{
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+ if (buf->base.mem.mem_type == TTM_PL_VRAM) {
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+ *gmrId = SVGA_GMR_FRAMEBUFFER;
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+ *offset = buf->base.offset;
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+ } else {
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+ *gmrId = buf->base.mem.start;
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+ *offset = 0;
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+ }
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+}
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+
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+void vmw_dmabuf_get_guest_ptr(struct vmw_dma_buffer *buf, SVGAGuestPtr *ptr)
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+{
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+ if (buf->base.mem.mem_type == TTM_PL_VRAM) {
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+ ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
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+ ptr->offset = buf->base.offset;
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+ } else {
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+ ptr->gmrId = buf->base.mem.start;
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+ ptr->offset = 0;
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+ }
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+}
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Jakob Bornecrantz