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8afa13a058
This is initial change adding support for DRIVER_GEM to vmwgfx. vmwgfx was written before GEM and has always used TTM. Over the years the TTM buffers started inherting from GEM objects but vmwgfx never implemented GEM making it quite awkward. We were directly setting variables in GEM objects to not make DRM crash. This change brings vmwgfx inline with other DRM drivers and allows us to use a lot of DRM helpers which have depended on drivers with GEM support. Due to historical reasons vmwgfx splits the idea of a buffer and surface which makes it a littly tricky since either one can be used in most of our ioctl's which take user space handles. For now our BO's are GEM objects and our surfaces are opaque objects which are backed by GEM objects. In the future I'd like to combine those into a single BO but we don't want to break any of our existing ioctl's so it will take time to do it in a non-destructive way. Signed-off-by: Zack Rusin <zackr@vmware.com> Reviewed-by: Martin Krastev <krastevm@vmware.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211206172620.3139754-5-zack@kde.org
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/**************************************************************************
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*
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* Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
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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 "vmwgfx_drv.h"
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static int vmw_bo_vm_lookup(struct ttm_device *bdev,
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struct drm_file *filp,
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unsigned long offset,
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unsigned long pages,
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struct ttm_buffer_object **p_bo)
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{
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struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
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struct drm_device *drm = &dev_priv->drm;
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struct drm_vma_offset_node *node;
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int ret;
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*p_bo = NULL;
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drm_vma_offset_lock_lookup(bdev->vma_manager);
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node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
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if (likely(node)) {
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*p_bo = container_of(node, struct ttm_buffer_object,
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base.vma_node);
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*p_bo = ttm_bo_get_unless_zero(*p_bo);
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}
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drm_vma_offset_unlock_lookup(bdev->vma_manager);
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if (!*p_bo) {
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drm_err(drm, "Could not find buffer object to map\n");
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return -EINVAL;
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}
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if (!drm_vma_node_is_allowed(node, filp)) {
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ret = -EACCES;
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goto out_no_access;
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}
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return 0;
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out_no_access:
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ttm_bo_put(*p_bo);
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return ret;
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}
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int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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static const struct vm_operations_struct vmw_vm_ops = {
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.pfn_mkwrite = vmw_bo_vm_mkwrite,
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.page_mkwrite = vmw_bo_vm_mkwrite,
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.fault = vmw_bo_vm_fault,
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.open = ttm_bo_vm_open,
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.close = ttm_bo_vm_close,
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};
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struct drm_file *file_priv = filp->private_data;
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struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
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struct ttm_device *bdev = &dev_priv->bdev;
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struct ttm_buffer_object *bo;
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int ret;
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if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
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return -EINVAL;
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ret = vmw_bo_vm_lookup(bdev, file_priv, vma->vm_pgoff, vma_pages(vma), &bo);
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if (unlikely(ret != 0))
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return ret;
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ret = ttm_bo_mmap_obj(vma, bo);
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if (unlikely(ret != 0))
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goto out_unref;
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vma->vm_ops = &vmw_vm_ops;
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/* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
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if (!is_cow_mapping(vma->vm_flags))
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vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
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ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
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return 0;
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out_unref:
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ttm_bo_put(bo);
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return ret;
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}
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