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_C32_2CRA = 0xdb,
32 NV_MEM_KIND_GENERIC_16Bx2 = 0xfe,
35 static int compute_block_height_log2(int height)
37 int block_height_log2 = NV_DEFAULT_BLOCK_HEIGHT_LOG2;
39 if (block_height_log2 > 0) {
40 /* Shrink, if a smaller block height could cover the whole
42 int proposed = NV_BLOCKLINEAR_GOB_HEIGHT << (block_height_log2 - 1);
43 while (proposed >= height) {
45 if (block_height_log2 == 0)
50 return block_height_log2;
53 static void compute_layout_blocklinear(int width, int height, int format,
54 enum nv_mem_kind *kind,
55 uint32_t *block_height_log2,
56 uint32_t *stride, uint32_t *size)
58 int pitch = drv_stride_from_format(format, width);
60 /* Align to blocklinear blocks. */
61 pitch = ALIGN(pitch, NV_BLOCKLINEAR_GOB_WIDTH);
63 /* Compute padded height. */
64 *block_height_log2 = compute_block_height_log2(height);
65 int block_height = 1 << *block_height_log2;
67 ALIGN(height, NV_BLOCKLINEAR_GOB_HEIGHT * block_height);
69 int bytes = pitch * padded_height;
71 /* Pad the allocation to the preferred page size.
72 * This will reduce the required page table size (see discussion in NV
73 * bug 1321091), and also acts as a WAR for NV bug 1325421.
75 bytes = ALIGN(bytes, NV_PREFERRED_PAGE_SIZE);
77 *kind = NV_MEM_KIND_C32_2CRA;
82 static void compute_layout_linear(int width, int height, int format,
83 uint32_t *stride, uint32_t *size)
85 *stride = drv_stride_from_format(format, width);
86 *size = *stride * height;
89 static int drv_tegra_bo_create(struct bo *bo, uint32_t width,
90 uint32_t height, uint32_t format, uint32_t flags)
92 uint32_t size, stride, block_height_log2 = 0;
93 enum nv_mem_kind kind = NV_MEM_KIND_PITCH;
94 struct drm_tegra_gem_create gem_create;
97 if (flags & DRV_BO_USE_RENDERING)
98 compute_layout_blocklinear(width, height, format, &kind,
99 &block_height_log2, &stride, &size);
101 compute_layout_linear(width, height, format, &stride, &size);
103 memset(&gem_create, 0, sizeof(gem_create));
104 gem_create.size = size;
105 gem_create.flags = 0;
107 ret = drmIoctl(bo->drv->fd, DRM_IOCTL_TEGRA_GEM_CREATE, &gem_create);
109 fprintf(stderr, "drv: DRM_IOCTL_TEGRA_GEM_CREATE failed "
110 "(size=%zu)\n", size);
114 bo->handles[0].u32 = gem_create.handle;
117 bo->strides[0] = stride;
119 if (kind != NV_MEM_KIND_PITCH) {
120 struct drm_tegra_gem_set_tiling gem_tile;
122 memset(&gem_tile, 0, sizeof(gem_tile));
123 gem_tile.handle = bo->handles[0].u32;
124 gem_tile.mode = DRM_TEGRA_GEM_TILING_MODE_BLOCK;
125 gem_tile.value = block_height_log2;
127 ret = drmCommandWriteRead(bo->drv->fd, DRM_TEGRA_GEM_SET_TILING,
128 &gem_tile, sizeof(gem_tile));
130 drv_gem_bo_destroy(bo);
134 /* Encode blocklinear parameters for EGLImage creation. */
135 bo->tiling = (kind & 0xff) |
136 ((block_height_log2 & 0xf) << 8);
137 bo->format_modifiers[0] = drv_fourcc_mod_code(NV, bo->tiling);
143 const struct backend backend_tegra =
146 .bo_create = drv_tegra_bo_create,
147 .bo_destroy = drv_gem_bo_destroy,
150 {DRV_FORMAT_XRGB8888, DRV_BO_USE_SCANOUT | DRV_BO_USE_CURSOR | DRV_BO_USE_LINEAR},
151 {DRV_FORMAT_ARGB8888, DRV_BO_USE_SCANOUT | DRV_BO_USE_CURSOR | DRV_BO_USE_LINEAR},
152 /* Blocklinear support */
153 {DRV_FORMAT_XRGB8888, DRV_BO_USE_SCANOUT | DRV_BO_USE_RENDERING},
154 {DRV_FORMAT_ARGB8888, DRV_BO_USE_SCANOUT | DRV_BO_USE_RENDERING},