xe_dsb_buffer.c

 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(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(&dsb_buf->vma->bo->vmap, idx * 4, 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 xe_device *xe = to_xe_device(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, xe_device_get_root_tile(xe),
47					PAGE_ALIGN(size),
48					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, false);
51	if (IS_ERR(obj)) {
52		kfree(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(dsb_buf->vma->bo);
66	kfree(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}