drivers/gpu/drm/i915/selftests/igt_mmap.c

   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
  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 }