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
intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer * dsb_buf)13 u32 intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf)
14 {
15 return i915_ggtt_offset(dsb_buf->vma);
16 }
17
intel_dsb_buffer_write(struct intel_dsb_buffer * dsb_buf,u32 idx,u32 val)18 void intel_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val)
19 {
20 dsb_buf->cmd_buf[idx] = val;
21 }
22
intel_dsb_buffer_read(struct intel_dsb_buffer * dsb_buf,u32 idx)23 u32 intel_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx)
24 {
25 return dsb_buf->cmd_buf[idx];
26 }
27
intel_dsb_buffer_memset(struct intel_dsb_buffer * dsb_buf,u32 idx,u32 val,size_t size)28 void 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
intel_dsb_buffer_create(struct intel_crtc * crtc,struct intel_dsb_buffer * dsb_buf,size_t size)35 bool 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
intel_dsb_buffer_cleanup(struct intel_dsb_buffer * dsb_buf)74 void 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
intel_dsb_buffer_flush_map(struct intel_dsb_buffer * dsb_buf)79 void intel_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf)
80 {
81 i915_gem_object_flush_map(dsb_buf->vma->obj);
82 }
83