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(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(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(obj))
46			return false;
47	} else {
48		obj = i915_gem_object_create_internal(i915, PAGE_ALIGN(size));
49		if (IS_ERR(obj))
50			return false;
51
52		i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
53	}
54
55	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
56	if (IS_ERR(vma)) {
57		i915_gem_object_put(obj);
58		return false;
59	}
60
61	buf = i915_gem_object_pin_map_unlocked(vma->obj, I915_MAP_WC);
62	if (IS_ERR(buf)) {
63		i915_vma_unpin_and_release(&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(&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(dsb_buf->vma->obj);
82}