1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /************************************************************************** 3 * 4 * Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 #include "vmwgfx_drv.h" 29 30 static struct ttm_buffer_object *vmw_bo_vm_lookup(struct ttm_device *bdev, 31 unsigned long offset, 32 unsigned long pages) 33 { 34 struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev); 35 struct drm_device *drm = &dev_priv->drm; 36 struct drm_vma_offset_node *node; 37 struct ttm_buffer_object *bo = NULL; 38 39 drm_vma_offset_lock_lookup(bdev->vma_manager); 40 41 node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages); 42 if (likely(node)) { 43 bo = container_of(node, struct ttm_buffer_object, 44 base.vma_node); 45 bo = ttm_bo_get_unless_zero(bo); 46 } 47 48 drm_vma_offset_unlock_lookup(bdev->vma_manager); 49 50 if (!bo) 51 drm_err(drm, "Could not find buffer object to map\n"); 52 53 return bo; 54 } 55 56 int vmw_mmap(struct file *filp, struct vm_area_struct *vma) 57 { 58 static const struct vm_operations_struct vmw_vm_ops = { 59 .pfn_mkwrite = vmw_bo_vm_mkwrite, 60 .page_mkwrite = vmw_bo_vm_mkwrite, 61 .fault = vmw_bo_vm_fault, 62 .open = ttm_bo_vm_open, 63 .close = ttm_bo_vm_close, 64 }; 65 struct drm_file *file_priv = filp->private_data; 66 struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev); 67 struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile; 68 struct ttm_device *bdev = &dev_priv->bdev; 69 struct ttm_buffer_object *bo; 70 int ret; 71 72 if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START)) 73 return -EINVAL; 74 75 bo = vmw_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); 76 if (unlikely(!bo)) 77 return -EINVAL; 78 79 ret = vmw_user_bo_verify_access(bo, tfile); 80 if (unlikely(ret != 0)) 81 goto out_unref; 82 83 ret = ttm_bo_mmap_obj(vma, bo); 84 if (unlikely(ret != 0)) 85 goto out_unref; 86 87 vma->vm_ops = &vmw_vm_ops; 88 89 /* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */ 90 if (!is_cow_mapping(vma->vm_flags)) 91 vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP; 92 93 ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */ 94 95 return 0; 96 97 out_unref: 98 ttm_bo_put(bo); 99 return ret; 100 } 101 102 /* struct vmw_validation_mem callback */ 103 static int vmw_vmt_reserve(struct vmw_validation_mem *m, size_t size) 104 { 105 static struct ttm_operation_ctx ctx = {.interruptible = false, 106 .no_wait_gpu = false}; 107 struct vmw_private *dev_priv = container_of(m, struct vmw_private, vvm); 108 109 return ttm_mem_global_alloc(vmw_mem_glob(dev_priv), size, &ctx); 110 } 111 112 /* struct vmw_validation_mem callback */ 113 static void vmw_vmt_unreserve(struct vmw_validation_mem *m, size_t size) 114 { 115 struct vmw_private *dev_priv = container_of(m, struct vmw_private, vvm); 116 117 return ttm_mem_global_free(vmw_mem_glob(dev_priv), size); 118 } 119 120 /** 121 * vmw_validation_mem_init_ttm - Interface the validation memory tracker 122 * to ttm. 123 * @dev_priv: Pointer to struct vmw_private. The reason we choose a vmw private 124 * rather than a struct vmw_validation_mem is to make sure assumption in the 125 * callbacks that struct vmw_private derives from struct vmw_validation_mem 126 * holds true. 127 * @gran: The recommended allocation granularity 128 */ 129 void vmw_validation_mem_init_ttm(struct vmw_private *dev_priv, size_t gran) 130 { 131 struct vmw_validation_mem *vvm = &dev_priv->vvm; 132 133 vvm->reserve_mem = vmw_vmt_reserve; 134 vvm->unreserve_mem = vmw_vmt_unreserve; 135 vvm->gran = gran; 136 } 137