| /* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ |
| /* vi: set ts=8 sw=8 sts=8: */ |
| /*************************************************************************/ /*! |
| @File |
| @Codingstyle LinuxKernel |
| @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved |
| @License MIT |
| |
| The contents of this file are subject to the MIT license as set out below. |
| |
| 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, sublicense, 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 shall be included in |
| all copies or substantial portions of the Software. |
| |
| This License is also included in this distribution in the file called |
| "MIT-COPYING". |
| |
| EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) 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 NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR |
| COPYRIGHT HOLDERS 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_netlink_gem.h" |
| |
| #include <linux/capability.h> |
| #include "kernel_compatibility.h" |
| |
| #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)) |
| int netlink_gem_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| struct drm_file *file_priv = file->private_data; |
| struct drm_device *dev = file_priv->minor->dev; |
| struct drm_vma_offset_node *node; |
| struct drm_gem_object *obj = NULL; |
| int err; |
| |
| drm_vma_offset_lock_lookup(dev->vma_offset_manager); |
| node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager, |
| vma->vm_pgoff, |
| vma_pages(vma)); |
| if (node) { |
| obj = container_of(node, struct drm_gem_object, vma_node); |
| |
| /* Don't mmap an object that is being destroyed */ |
| if (!kref_get_unless_zero(&obj->refcount)) |
| obj = NULL; |
| } |
| drm_vma_offset_unlock_lookup(dev->vma_offset_manager); |
| |
| if (!obj) |
| return -EINVAL; |
| |
| /* Allow Netlink clients to mmap any object for reading */ |
| if (!capable(CAP_SYS_RAWIO) || (vma->vm_flags & VM_WRITE)) |
| { |
| if (!drm_vma_node_is_allowed(node, file_priv)) { |
| err = -EACCES; |
| goto exit_unref_obj; |
| } |
| } |
| |
| err = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma); |
| |
| exit_unref_obj: |
| drm_gem_object_put_unlocked(obj); |
| return err; |
| } |
| #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)) */ |
| int netlink_gem_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| struct drm_file *file_priv = file->private_data; |
| struct drm_device *dev = file_priv->minor->dev; |
| struct drm_vma_offset_node *node; |
| struct drm_gem_object *obj; |
| int err; |
| |
| mutex_lock(&dev->struct_mutex); |
| |
| node = drm_vma_offset_exact_lookup(dev->vma_offset_manager, |
| vma->vm_pgoff, |
| vma_pages(vma)); |
| if (!node) { |
| err = -EINVAL; |
| goto exit_unlock; |
| } |
| |
| /* Allow Netlink clients to mmap any object for reading */ |
| if (!capable(CAP_SYS_RAWIO) || (vma->vm_flags & VM_WRITE)) |
| { |
| if (!drm_vma_node_is_allowed(node, file_priv)) { |
| err = -EACCES; |
| goto exit_unlock; |
| } |
| } |
| |
| obj = container_of(node, struct drm_gem_object, vma_node); |
| |
| err = drm_gem_mmap_obj(obj, drm_vma_node_size(node) << PAGE_SHIFT, vma); |
| |
| exit_unlock: |
| mutex_unlock(&dev->struct_mutex); |
| return err; |
| } |
| #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)) */ |