vmwgfx: Add dmabuf helper functions for pinning

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 292 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c
new file mode 100644
index 000000000000..5668ad980cb5
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_dmabuf.c
@@ -0,0 +1,292 @@
+/**************************************************************************
+ *
+ * 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 "ttm/ttm_placement.h"
+
+#include "drmP.h"
+#include "vmwgfx_drv.h"
+
+
+/**
+ * Validate a buffer to placement.
+ *
+ * May only be called by the current master as this function takes the
+ * its lock in write mode.
+ *
+ * Returns
+ *  -ERESTARTSYS if interrupted by a signal.
+ */
+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;
+
+        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;
+}
+
+/**
+ * Move a buffer to vram or gmr.
+ *
+ * May only be called by the current master as this function takes the
+ * its lock in write mode.
+ *
+ * @dev_priv:  Driver private.
+ * @buf:  DMA buffer to move.
+ * @pin:  Pin buffer if true.
+ * @interruptible:  Use interruptible wait.
+ *
+ * Returns
+ * -ERESTARTSYS if interrupted by a signal.
+ */
+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;
+
+        ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
+        if (unlikely(ret != 0))
+                goto err;
+
+        /**
+         * Put BO in VRAM if there is space, otherwise as a GMR.
+         * If there is no space in VRAM and GMR ids are all used up,
+         * start evicting GMRs to make room. If the DMA buffer can't be
+         * used as a GMR, this will return -ENOMEM.
+         */
+
+        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 that failed, try VRAM again, this time evicting
+         * previous contents.
+         */
+
+        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;
+}
+
+/**
+ * Move a buffer to vram.
+ *
+ * May only be called by the current master as this function takes the
+ * its lock in write mode.
+ *
+ * @dev_priv:  Driver private.
+ * @buf:  DMA buffer to move.
+ * @pin:  Pin buffer in vram if true.
+ * @interruptible:  Use interruptible wait.
+ *
+ * Returns
+ * -ERESTARTSYS if interrupted by a signal.
+ */
+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);
+}
+
+/**
+ * Move a buffer to start of vram.
+ *
+ * May only be called by the current master as this function takes the
+ * its lock in write mode.
+ *
+ * @dev_priv:  Driver private.
+ * @buf:  DMA buffer to move.
+ * @pin:  Pin buffer in vram if true.
+ * @interruptible:  Use interruptible wait.
+ *
+ * Returns
+ * -ERESTARTSYS if interrupted by a signal.
+ */
+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;
+
+        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;
+}
+
+/**
+ * Unpin the buffer given buffer, does not move the buffer.
+ *
+ * May only be called by the current master as this function takes the
+ * its lock in write mode.
+ *
+ * @dev_priv:  Driver private.
+ * @buf:  DMA buffer to unpin.
+ * @interruptible:  Use interruptible wait.
+ *
+ * Returns
+ * -ERESTARTSYS if interrupted by a signal.
+ */
+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);
+}
+
+/**
+ * Move a buffer to system memory, does not pin the buffer.
+ *
+ * May only be called by the current master as this function takes the
+ * its lock in write mode.
+ *
+ * @dev_priv:  Driver private.
+ * @buf:  DMA buffer to move.
+ * @interruptible:  Use interruptible wait.
+ *
+ * Returns
+ * -ERESTARTSYS if interrupted by a signal.
+ */
+int vmw_dmabuf_to_system(struct vmw_private *dev_priv,
+                         struct vmw_dma_buffer *buf,
+                         bool interruptible)
+{
+        return vmw_dmabuf_to_placement(dev_priv, buf,
+                                       &vmw_sys_placement,
+                                       interruptible);
+}
+
+void vmw_dmabuf_get_id_offset(struct vmw_dma_buffer *buf,
+                              uint32_t *gmrId, uint32_t *offset)
+{
+        if (buf->base.mem.mem_type == TTM_PL_VRAM) {
+                *gmrId = SVGA_GMR_FRAMEBUFFER;
+                *offset = buf->base.offset;
+        } else {
+                *gmrId = buf->base.mem.start;
+                *offset = 0;
+        }
+}
+
+void vmw_dmabuf_get_guest_ptr(struct vmw_dma_buffer *buf, SVGAGuestPtr *ptr)
+{
+        if (buf->base.mem.mem_type == TTM_PL_VRAM) {
+                ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
+                ptr->offset = buf->base.offset;
+        } else {
+                ptr->gmrId = buf->base.mem.start;
+                ptr->offset = 0;
+        }
+}