1// SPDX-License-Identifier: MIT
2/*
3 * Copyright 2023, Intel Corporation.
4 */
5
6#include "i915_vma.h"
7#include "intel_display_types.h"
8#include "intel_dsb_buffer.h"
9#include "xe_bo.h"
10#include "xe_device.h"
11#include "xe_device_types.h"
12
13u32 intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf)
14{
15 return xe_bo_ggtt_addr(bo: dsb_buf->vma->bo);
16}
17
18void intel_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val)
19{
20 iosys_map_wr(&dsb_buf->vma->bo->vmap, idx * 4, u32, val);
21}
22
23u32 intel_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx)
24{
25 return iosys_map_rd(&dsb_buf->vma->bo->vmap, idx * 4, u32);
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 iosys_map_memset(dst: &dsb_buf->vma->bo->vmap, offset: idx * 4, value: val, len: size);
33}
34
35bool intel_dsb_buffer_create(struct intel_crtc *crtc, struct intel_dsb_buffer *dsb_buf, size_t size)
36{
37 struct xe_device *xe = to_xe_device(dev: crtc->base.dev);
38 struct xe_bo *obj;
39 struct i915_vma *vma;
40
41 vma = kzalloc(sizeof(*vma), GFP_KERNEL);
42 if (!vma)
43 return false;
44
45 /* Set scanout flag for WC mapping */
46 obj = xe_bo_create_pin_map_novm(xe, tile: xe_device_get_root_tile(xe),
47 PAGE_ALIGN(size),
48 type: ttm_bo_type_kernel,
49 XE_BO_FLAG_VRAM_IF_DGFX(xe_device_get_root_tile(xe)) |
50 XE_BO_FLAG_SCANOUT | XE_BO_FLAG_GGTT, intr: false);
51 if (IS_ERR(ptr: obj)) {
52 kfree(objp: vma);
53 return false;
54 }
55
56 vma->bo = obj;
57 dsb_buf->vma = vma;
58 dsb_buf->buf_size = size;
59
60 return true;
61}
62
63void intel_dsb_buffer_cleanup(struct intel_dsb_buffer *dsb_buf)
64{
65 xe_bo_unpin_map_no_vm(bo: dsb_buf->vma->bo);
66 kfree(objp: dsb_buf->vma);
67}
68
69void intel_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf)
70{
71 struct xe_device *xe = dsb_buf->vma->bo->tile->xe;
72
73 /*
74 * The memory barrier here is to ensure coherency of DSB vs MMIO,
75 * both for weak ordering archs and discrete cards.
76 */
77 xe_device_wmb(xe);
78 xe_device_l2_flush(xe);
79}
80

source code of linux/drivers/gpu/drm/xe/display/xe_dsb_buffer.c