cf3e3e86d7
Use the ttm handlers for servicing page faults, and vm_access. We do our own validation of read-only access, otherwise use the ttm handlers as much as possible. Because the ttm handlers expect the vma_node at vma->base, we slightly need to massage the mmap handlers to look at vma_node->driver_private to fetch the bo, if it's NULL, we assume i915's normal mmap_offset uapi is used. This is the easiest way to achieve compatibility without changing ttm's semantics. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210610070152.572423-5-thomas.hellstrom@linux.intel.com
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#include <drm/drm_file.h>
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#include "i915_drv.h"
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#include "igt_mmap.h"
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unsigned long igt_mmap_offset(struct drm_i915_private *i915,
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u64 offset,
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unsigned long size,
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unsigned long prot,
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unsigned long flags)
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{
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struct drm_vma_offset_node *node;
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struct file *file;
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unsigned long addr;
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int err;
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/* no need to refcount, we own this object */
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drm_vma_offset_lock_lookup(i915->drm.vma_offset_manager);
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node = drm_vma_offset_exact_lookup_locked(i915->drm.vma_offset_manager,
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offset / PAGE_SIZE, size / PAGE_SIZE);
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drm_vma_offset_unlock_lookup(i915->drm.vma_offset_manager);
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if (GEM_WARN_ON(!node)) {
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pr_info("Failed to lookup %llx\n", offset);
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return -ENOENT;
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}
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/* Pretend to open("/dev/dri/card0") */
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file = mock_drm_getfile(i915->drm.primary, O_RDWR);
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if (IS_ERR(file))
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return PTR_ERR(file);
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err = drm_vma_node_allow(node, file->private_data);
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if (err) {
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addr = err;
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goto out_file;
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}
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addr = vm_mmap(file, 0, drm_vma_node_size(node) << PAGE_SHIFT,
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prot, flags, drm_vma_node_offset_addr(node));
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drm_vma_node_revoke(node, file->private_data);
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out_file:
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fput(file);
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return addr;
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}
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