1// SPDX-License-Identifier: MIT
2/*
3 * Copyright 2023, Intel Corporation.
4 */
5
6#include "gem/i915_gem_internal.h"
7#include "gem/i915_gem_lmem.h"
8#include "i915_drv.h"
9#include "i915_vma.h"
10#include "intel_display_types.h"
11#include "intel_dsb_buffer.h"
12
13u32 intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf)
14{
15 return i915_ggtt_offset(vma: dsb_buf->vma);
16}
17
18void intel_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val)
19{
20 dsb_buf->cmd_buf[idx] = val;
21}
22
23u32 intel_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx)
24{
25 return dsb_buf->cmd_buf[idx];
26}
27
28void intel_dsb_buffer_memset(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val, size_t size)
29{
30 WARN_ON(idx > (dsb_buf->buf_size - size) / sizeof(*dsb_buf->cmd_buf));
31
32 memset(&dsb_buf->cmd_buf[idx], val, size);
33}
34
35bool intel_dsb_buffer_create(struct intel_crtc *crtc, struct intel_dsb_buffer *dsb_buf, size_t size)
36{
37 struct drm_i915_private *i915 = to_i915(dev: crtc->base.dev);
38 struct drm_i915_gem_object *obj;
39 struct i915_vma *vma;
40 u32 *buf;
41
42 if (HAS_LMEM(i915)) {
43 obj = i915_gem_object_create_lmem(i915, PAGE_ALIGN(size),
44 I915_BO_ALLOC_CONTIGUOUS);
45 if (IS_ERR(ptr: obj))
46 return false;
47 } else {
48 obj = i915_gem_object_create_internal(i915, PAGE_ALIGN(size));
49 if (IS_ERR(ptr: obj))
50 return false;
51
52 i915_gem_object_set_cache_coherency(obj, cache_level: I915_CACHE_NONE);
53 }
54
55 vma = i915_gem_object_ggtt_pin(obj, NULL, size: 0, alignment: 0, flags: 0);
56 if (IS_ERR(ptr: vma)) {
57 i915_gem_object_put(obj);
58 return false;
59 }
60
61 buf = i915_gem_object_pin_map_unlocked(obj: vma->obj, type: I915_MAP_WC);
62 if (IS_ERR(ptr: buf)) {
63 i915_vma_unpin_and_release(p_vma: &vma, I915_VMA_RELEASE_MAP);
64 return false;
65 }
66
67 dsb_buf->vma = vma;
68 dsb_buf->cmd_buf = buf;
69 dsb_buf->buf_size = size;
70
71 return true;
72}
73
74void intel_dsb_buffer_cleanup(struct intel_dsb_buffer *dsb_buf)
75{
76 i915_vma_unpin_and_release(p_vma: &dsb_buf->vma, I915_VMA_RELEASE_MAP);
77}
78
79void intel_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf)
80{
81 i915_gem_object_flush_map(obj: dsb_buf->vma->obj);
82}
83

source code of linux/drivers/gpu/drm/i915/display/intel_dsb_buffer.c