2 * Copyright (c) 2014 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.
12 #include <tegra_drm.h>
19 * GOB (Group Of Bytes) is the basic unit of the blocklinear layout.
20 * GOBs are arranged to blocks, where the height of the block (measured
21 * in GOBs) is configurable.
23 #define NV_BLOCKLINEAR_GOB_HEIGHT 8
24 #define NV_BLOCKLINEAR_GOB_WIDTH 64
25 #define NV_DEFAULT_BLOCK_HEIGHT_LOG2 4
26 #define NV_PREFERRED_PAGE_SIZE (128 * 1024)
30 NV_MEM_KIND_PITCH = 0,
31 NV_MEM_KIND_GENERIC_16Bx2 = 0xfe,
34 static int compute_block_height_log2(int height)
36 int block_height_log2 = NV_DEFAULT_BLOCK_HEIGHT_LOG2;
38 if (block_height_log2 > 0) {
39 /* Shrink, if a smaller block height could cover the whole
41 int proposed = NV_BLOCKLINEAR_GOB_HEIGHT << (block_height_log2 - 1);
42 while (proposed >= height) {
44 if (block_height_log2 == 0)
49 return block_height_log2;
52 static void compute_layout_blocklinear(int width, int height, int format,
53 enum nv_mem_kind *kind,
54 uint32_t *block_height_log2,
55 uint32_t *stride, uint32_t *size)
57 int pitch = gbm_stride_from_format(format, width);
59 /* Align to blocklinear blocks. */
60 pitch = ALIGN(pitch, NV_BLOCKLINEAR_GOB_WIDTH);
62 /* Compute padded height. */
63 *block_height_log2 = compute_block_height_log2(height);
64 int block_height = 1 << *block_height_log2;
66 ALIGN(height, NV_BLOCKLINEAR_GOB_HEIGHT * block_height);
68 int bytes = pitch * padded_height;
70 /* Pad the allocation to the preferred page size.
71 * This will reduce the required page table size (see discussion in NV
72 * bug 1321091), and also acts as a WAR for NV bug 1325421.
74 bytes = ALIGN(bytes, NV_PREFERRED_PAGE_SIZE);
76 *kind = NV_MEM_KIND_GENERIC_16Bx2;
81 static void compute_layout_linear(int width, int height, int format,
82 uint32_t *stride, uint32_t *size)
84 *stride = gbm_stride_from_format(format, width);
85 *size = *stride * height;
88 static int gbm_tegra_bo_create(struct gbm_bo *bo, uint32_t width,
89 uint32_t height, uint32_t format, uint32_t flags)
91 uint32_t size, stride, block_height_log2 = 0;
92 enum nv_mem_kind kind = NV_MEM_KIND_PITCH;
93 struct drm_tegra_gem_create gem_create;
96 if (flags & GBM_BO_USE_RENDERING)
97 compute_layout_blocklinear(width, height, format, &kind,
98 &block_height_log2, &stride, &size);
100 compute_layout_linear(width, height, format, &stride, &size);
102 memset(&gem_create, 0, sizeof(gem_create));
103 gem_create.size = size;
104 gem_create.flags = 0;
106 ret = drmIoctl(bo->gbm->fd, DRM_IOCTL_TEGRA_GEM_CREATE, &gem_create);
108 fprintf(stderr, "minigbm: DRM_IOCTL_TEGRA_GEM_CREATE failed "
109 "(size=%zu)\n", size);
113 bo->handles[0].u32 = gem_create.handle;
116 bo->strides[0] = stride;
118 if (kind != NV_MEM_KIND_PITCH) {
119 struct drm_tegra_gem_set_tiling gem_tile;
121 memset(&gem_tile, 0, sizeof(gem_tile));
122 gem_tile.handle = bo->handles[0].u32;
123 gem_tile.mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
124 gem_tile.value = block_height_log2;
126 ret = drmCommandWriteRead(bo->gbm->fd, DRM_TEGRA_GEM_SET_TILING,
127 &gem_tile, sizeof(gem_tile));
129 gbm_gem_bo_destroy(bo);
133 /* Encode blocklinear parameters for EGLImage creation. */
135 /* XXX Bringup hack: If the highest order bit is set in
136 * EGL_DMA_BUF_PLANE0_PITCH_EXT, Nvidia driver treats it as
137 * a hint that the buffer is tiled, and the remaining bits in
138 * the pitch attribute are treated as vendor specific tiling
139 * arguments. Using this hack means that we don't need to add
140 * a new FOURCC format, or EGL_DMA_BUF_PLANE0_TILING_EXT
141 * attribute to the dma-buf import extension.
143 bo->tiling = (1 << 31) |
145 ((block_height_log2 & 0xf) << 8);
151 struct gbm_driver gbm_driver_tegra =
154 .bo_create = gbm_tegra_bo_create,
155 .bo_destroy = gbm_gem_bo_destroy,
158 {GBM_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE | GBM_BO_USE_LINEAR},
159 {GBM_FORMAT_ARGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE | GBM_BO_USE_LINEAR},
160 /* Blocklinear support */
161 {GBM_FORMAT_XRGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING},
162 {GBM_FORMAT_ARGB8888, GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING},