1 /*
2 * Copyright 2017 The Chromium OS Authors. All rights reserved.
3 * Use of this source code is governed by a BSD-style license that can be
4 * found in the LICENSE file.
5 */
6
7 #ifdef DRV_VC4
8
9 #include <errno.h>
10 #include <stdio.h>
11 #include <string.h>
12 #include <sys/mman.h>
13 #include <vc4_drm.h>
14 #include <xf86drm.h>
15
16 #include "drv_priv.h"
17 #include "helpers.h"
18 #include "util.h"
19
20 static const uint32_t render_target_formats[] = { DRM_FORMAT_ARGB8888, DRM_FORMAT_RGB565,
21 DRM_FORMAT_XRGB8888 };
22
23 static const uint32_t texture_only_formats[] = { DRM_FORMAT_NV12, DRM_FORMAT_YVU420 };
24
vc4_init(struct driver * drv)25 static int vc4_init(struct driver *drv)
26 {
27 drv_add_combinations(drv, render_target_formats, ARRAY_SIZE(render_target_formats),
28 &LINEAR_METADATA, BO_USE_RENDER_MASK);
29
30 drv_add_combinations(drv, texture_only_formats, ARRAY_SIZE(texture_only_formats),
31 &LINEAR_METADATA, BO_USE_TEXTURE_MASK);
32 /*
33 * Chrome uses DMA-buf mmap to write to YV12 buffers, which are then accessed by the
34 * Video Encoder Accelerator (VEA). It could also support NV12 potentially in the future.
35 */
36 drv_modify_combination(drv, DRM_FORMAT_YVU420, &LINEAR_METADATA, BO_USE_HW_VIDEO_ENCODER);
37 drv_modify_combination(drv, DRM_FORMAT_NV12, &LINEAR_METADATA,
38 BO_USE_HW_VIDEO_DECODER | BO_USE_SCANOUT | BO_USE_HW_VIDEO_ENCODER);
39
40 return drv_modify_linear_combinations(drv);
41 }
42
vc4_bo_create_for_modifier(struct bo * bo,uint32_t width,uint32_t height,uint32_t format,uint64_t modifier)43 static int vc4_bo_create_for_modifier(struct bo *bo, uint32_t width, uint32_t height,
44 uint32_t format, uint64_t modifier)
45 {
46 int ret;
47 size_t plane;
48 uint32_t stride;
49 struct drm_vc4_create_bo bo_create = { 0 };
50
51 switch (modifier) {
52 case DRM_FORMAT_MOD_LINEAR:
53 break;
54 case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED:
55 drv_log("DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED not supported yet\n");
56 return -EINVAL;
57 default:
58 return -EINVAL;
59 }
60
61 /*
62 * Since the ARM L1 cache line size is 64 bytes, align to that as a
63 * performance optimization.
64 */
65 stride = drv_stride_from_format(format, width, 0);
66 stride = ALIGN(stride, 64);
67 drv_bo_from_format(bo, stride, height, format);
68
69 bo_create.size = bo->meta.total_size;
70
71 ret = drmIoctl(bo->drv->fd, DRM_IOCTL_VC4_CREATE_BO, &bo_create);
72 if (ret) {
73 drv_log("DRM_IOCTL_VC4_CREATE_BO failed (size=%zu)\n", bo->meta.total_size);
74 return -errno;
75 }
76
77 for (plane = 0; plane < bo->meta.num_planes; plane++)
78 bo->handles[plane].u32 = bo_create.handle;
79
80 return 0;
81 }
82
vc4_bo_create(struct bo * bo,uint32_t width,uint32_t height,uint32_t format,uint64_t use_flags)83 static int vc4_bo_create(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
84 uint64_t use_flags)
85 {
86 struct combination *combo;
87
88 combo = drv_get_combination(bo->drv, format, use_flags);
89 if (!combo)
90 return -EINVAL;
91
92 return vc4_bo_create_for_modifier(bo, width, height, format, combo->metadata.modifier);
93 }
94
vc4_bo_create_with_modifiers(struct bo * bo,uint32_t width,uint32_t height,uint32_t format,const uint64_t * modifiers,uint32_t count)95 static int vc4_bo_create_with_modifiers(struct bo *bo, uint32_t width, uint32_t height,
96 uint32_t format, const uint64_t *modifiers, uint32_t count)
97 {
98 static const uint64_t modifier_order[] = {
99 DRM_FORMAT_MOD_LINEAR,
100 };
101 uint64_t modifier;
102
103 modifier = drv_pick_modifier(modifiers, count, modifier_order, ARRAY_SIZE(modifier_order));
104
105 return vc4_bo_create_for_modifier(bo, width, height, format, modifier);
106 }
107
vc4_bo_map(struct bo * bo,struct vma * vma,size_t plane,uint32_t map_flags)108 static void *vc4_bo_map(struct bo *bo, struct vma *vma, size_t plane, uint32_t map_flags)
109 {
110 int ret;
111 struct drm_vc4_mmap_bo bo_map = { 0 };
112
113 bo_map.handle = bo->handles[0].u32;
114 ret = drmCommandWriteRead(bo->drv->fd, DRM_VC4_MMAP_BO, &bo_map, sizeof(bo_map));
115 if (ret) {
116 drv_log("DRM_VC4_MMAP_BO failed\n");
117 return MAP_FAILED;
118 }
119
120 vma->length = bo->meta.total_size;
121 return mmap(NULL, bo->meta.total_size, drv_get_prot(map_flags), MAP_SHARED, bo->drv->fd,
122 bo_map.offset);
123 }
124
125 const struct backend backend_vc4 = {
126 .name = "vc4",
127 .init = vc4_init,
128 .bo_create = vc4_bo_create,
129 .bo_create_with_modifiers = vc4_bo_create_with_modifiers,
130 .bo_import = drv_prime_bo_import,
131 .bo_destroy = drv_gem_bo_destroy,
132 .bo_map = vc4_bo_map,
133 .bo_unmap = drv_bo_munmap,
134 };
135
136 #endif
137