1 /*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright © 2019 Intel Corporation
5 */
6
7 #include <drm/drm_file.h>
8
9 #include "i915_drv.h"
10 #include "igt_mmap.h"
11
igt_mmap_offset(struct drm_i915_private * i915,u64 offset,unsigned long size,unsigned long prot,unsigned long flags)12 unsigned long igt_mmap_offset(struct drm_i915_private *i915,
13 u64 offset,
14 unsigned long size,
15 unsigned long prot,
16 unsigned long flags)
17 {
18 struct drm_vma_offset_node *node;
19 struct file *file;
20 unsigned long addr;
21 int err;
22
23 /* no need to refcount, we own this object */
24 drm_vma_offset_lock_lookup(i915->drm.vma_offset_manager);
25 node = drm_vma_offset_exact_lookup_locked(i915->drm.vma_offset_manager,
26 offset / PAGE_SIZE, size / PAGE_SIZE);
27 drm_vma_offset_unlock_lookup(i915->drm.vma_offset_manager);
28
29 if (GEM_WARN_ON(!node)) {
30 pr_info("Failed to lookup %llx\n", offset);
31 return -ENOENT;
32 }
33
34 /* Pretend to open("/dev/dri/card0") */
35 file = mock_drm_getfile(i915->drm.primary, O_RDWR);
36 if (IS_ERR(file))
37 return PTR_ERR(file);
38
39 err = drm_vma_node_allow(node, file->private_data);
40 if (err) {
41 addr = err;
42 goto out_file;
43 }
44
45 addr = vm_mmap(file, 0, drm_vma_node_size(node) << PAGE_SHIFT,
46 prot, flags, drm_vma_node_offset_addr(node));
47
48 drm_vma_node_revoke(node, file->private_data);
49 out_file:
50 fput(file);
51 return addr;
52 }
53