- 根目录:
- drivers
- gpu
- drm
- vmwgfx
- vmwgfx_dmabuf.c
/**************************************************************************
*
* 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"
/**
* vmw_dmabuf_to_placement - Validate a buffer to placement.
*
* @dev_priv: Driver private.
* @buf: DMA buffer to move.
* @pin: Pin buffer if true.
* @interruptible: Use interruptible wait.
*
* May only be called by the current master since it assumes that the
* master lock is the current master's lock.
* This function takes the master's lock in write mode.
* Flushes and unpins the query bo to avoid failures.
*
* 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;
vmw_execbuf_release_pinned_bo(dev_priv);
ret = ttm_bo_reserve(bo, interruptible, false, false, 0);
if (unlikely(ret != 0))
goto err;
ret = ttm_bo_validate(bo, placement, interruptible, false);
ttm_bo_unreserve(bo);
err:
ttm_write_unlock(&vmaster->lock);
return ret;
}
/**
* vmw_dmabuf_to_vram_or_gmr - Move a buffer to vram or gmr.
*
* May only be called by the current master since it assumes that the
* master lock is the current master's lock.
* This function takes the master's lock in write mode.
* Flushes and unpins the query bo if @pin == true to avoid failures.
*
* @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;
if (pin)
vmw_execbuf_release_pinned_bo(dev_priv);
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);
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);
err_unreserve:
ttm_bo_unreserve(bo);
err:
ttm_write_unlock(&vmaster->lock);
return ret;
}
/**
* vmw_dmabuf_to_vram - Move a buffer to vram.
*
* May only be called by the current master since it assumes that the
* master lock is the current master's lock.
* This function takes the master's 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);
}
/**
* vmw_dmabuf_to_start_of_vram - Move a buffer to start of vram.
*
* May only be called by the current master since it assumes that the
* master lock is the current master's lock.
* This function takes the master's lock in write mode.
* Flushes and unpins the query bo if @pin == true to avoid failures.
*
* @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;
if (pin)
vmw_execbuf_release_pinned_bo(dev_priv);
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);
ret = ttm_bo_validate(bo, &placement, interruptible, 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;
}
/**
* vmw_dmabuf_upin - Unpin the buffer given buffer, does not move the buffer.
*
* May only be called by the current master since it assumes that the
* master lock is the current master's lock.
* This function takes the master's 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);
}
/**
* vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
* of a buffer.
*
* @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
* @ptr: SVGAGuestPtr returning the result.
*/
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;
}
}
/**
* vmw_bo_pin - Pin or unpin a buffer object without moving it.
*
* @bo: The buffer object. Must be reserved.
* @pin: Whether to pin or unpin.
*
*/
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;
lockdep_assert_held(&bo->resv->lock.base);
pl_flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB
| TTM_PL_FLAG_SYSTEM | 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);
BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
}