Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2009 Intel Corporation |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the next |
| 12 | * paragraph) shall be included in all copies or substantial portions of the |
| 13 | * Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 21 | * IN THE SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | /** @file gem_tiled_wc.c |
| 25 | * |
| 26 | * This is a test of write-combining mmap's behavior on tiled objects |
| 27 | * with respect to the reported swizzling value. |
| 28 | * |
| 29 | * The goal is to exercise the complications that arise when using a linear |
| 30 | * view of a tiled object that is subject to hardware swizzling. This is |
| 31 | * useful to check that we are presenting the correct view of the object |
| 32 | * to userspace, and that userspace has to respect the swizzle. |
| 33 | */ |
| 34 | |
| 35 | #include <stdlib.h> |
| 36 | #include <stdio.h> |
| 37 | #include <string.h> |
| 38 | #include <fcntl.h> |
| 39 | #include <inttypes.h> |
| 40 | #include <errno.h> |
| 41 | #include <sys/stat.h> |
| 42 | #include <sys/time.h> |
| 43 | #include <sys/ioctl.h> |
| 44 | #include "drm.h" |
| 45 | #include "ioctl_wrappers.h" |
| 46 | #include "drmtest.h" |
| 47 | #include "intel_io.h" |
| 48 | #include "intel_chipset.h" |
| 49 | |
| 50 | #define WIDTH 512 |
| 51 | #define HEIGHT 512 |
| 52 | #define SIZE (WIDTH*HEIGHT*sizeof(uint32_t)) |
| 53 | |
| 54 | #define PAGE_SIZE 4096 |
| 55 | |
| 56 | static int tile_width; |
| 57 | static int tile_height; |
| 58 | static int tile_size; |
| 59 | |
| 60 | static uint32_t |
| 61 | create_bo(int fd) |
| 62 | { |
| 63 | uint32_t handle; |
| 64 | uint32_t *data; |
| 65 | int i; |
| 66 | |
| 67 | handle = gem_create(fd, SIZE); |
| 68 | gem_set_tiling(fd, handle, I915_TILING_X, WIDTH * sizeof(uint32_t)); |
| 69 | |
| 70 | /* Fill the BO with dwords starting at start_val */ |
Chris Wilson | 5e9fac5 | 2015-01-22 07:52:09 +0000 | [diff] [blame] | 71 | data = gem_mmap__gtt(fd, handle, SIZE, PROT_READ | PROT_WRITE); |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 72 | for (i = 0; i < WIDTH*HEIGHT; i++) |
| 73 | data[i] = i; |
| 74 | munmap(data, SIZE); |
| 75 | |
| 76 | return handle; |
| 77 | } |
| 78 | |
| 79 | static int |
| 80 | swizzle_bit(int bit, int offset) |
| 81 | { |
| 82 | return (offset & (1 << bit)) >> (bit - 6); |
| 83 | } |
| 84 | |
| 85 | /* Translate from a swizzled offset in the tiled buffer to the corresponding |
| 86 | * value from the original linear buffer. |
| 87 | */ |
| 88 | static uint32_t |
| 89 | calculate_expected(int offset) |
| 90 | { |
| 91 | int tile_off = offset & (tile_size - 1); |
| 92 | int tile_base = offset & -tile_size; |
| 93 | int tile_index = tile_base / tile_size; |
| 94 | int tiles_per_row = 4*WIDTH / tile_width; |
| 95 | |
| 96 | /* base x,y values from the tile (page) index. */ |
| 97 | int base_y = tile_index / tiles_per_row * tile_height; |
| 98 | int base_x = tile_index % tiles_per_row * (tile_width/4); |
| 99 | |
| 100 | /* x, y offsets within the tile */ |
| 101 | int tile_y = tile_off / tile_width; |
| 102 | int tile_x = (tile_off % tile_width) / 4; |
| 103 | |
Chris Wilson | 5e9fac5 | 2015-01-22 07:52:09 +0000 | [diff] [blame] | 104 | igt_debug("%s(%d): %3d, %3d, %3d,%3d = %d\n", |
| 105 | __func__, offset, base_x, base_y, tile_x, tile_y, |
| 106 | (base_y + tile_y) * WIDTH + base_x + tile_x); |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 107 | return (base_y + tile_y) * WIDTH + base_x + tile_x; |
| 108 | } |
| 109 | |
| 110 | static void |
| 111 | get_tiling(int fd, uint32_t handle, uint32_t *tiling, uint32_t *swizzle) |
| 112 | { |
| 113 | struct drm_i915_gem_get_tiling2 { |
| 114 | uint32_t handle; |
| 115 | uint32_t tiling_mode; |
| 116 | uint32_t swizzle_mode; |
| 117 | uint32_t phys_swizzle_mode; |
| 118 | } arg; |
| 119 | #define DRM_IOCTL_I915_GEM_GET_TILING2 DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_TILING, struct drm_i915_gem_get_tiling2) |
| 120 | |
| 121 | memset(&arg, 0, sizeof(arg)); |
| 122 | arg.handle = handle; |
| 123 | |
| 124 | do_or_die(drmIoctl(fd, DRM_IOCTL_I915_GEM_GET_TILING2, &arg)); |
| 125 | igt_require(arg.phys_swizzle_mode == arg.swizzle_mode); |
| 126 | |
| 127 | *tiling = arg.tiling_mode; |
| 128 | *swizzle = arg.swizzle_mode; |
| 129 | } |
| 130 | |
| 131 | igt_simple_main |
| 132 | { |
| 133 | int fd; |
| 134 | int i, iter = 100; |
| 135 | uint32_t tiling, swizzle; |
| 136 | uint32_t handle; |
| 137 | |
| 138 | fd = drm_open_any(); |
| 139 | igt_require_mmap_wc(fd); |
| 140 | |
| 141 | handle = create_bo(fd); |
| 142 | get_tiling(fd, handle, &tiling, &swizzle); |
| 143 | |
| 144 | if (IS_GEN2(intel_get_drm_devid(fd))) { |
| 145 | tile_height = 16; |
| 146 | tile_width = 128; |
| 147 | tile_size = 2048; |
| 148 | } else { |
| 149 | tile_height = 8; |
| 150 | tile_width = 512; |
| 151 | tile_size = PAGE_SIZE; |
| 152 | } |
| 153 | |
| 154 | /* Read a bunch of random subsets of the data and check that they come |
| 155 | * out right. |
| 156 | */ |
| 157 | for (i = 0; i < iter; i++) { |
| 158 | int size = WIDTH * HEIGHT * 4; |
| 159 | int offset = (random() % size) & ~3; |
| 160 | int len = (random() % size) & ~3; |
| 161 | int first_page, last_page; |
| 162 | uint32_t *linear; |
| 163 | int j; |
| 164 | |
| 165 | if (len == 0) |
| 166 | len = 4; |
| 167 | |
| 168 | if (offset + len > size) |
| 169 | len = size - offset; |
| 170 | |
| 171 | if (i == 0) { |
| 172 | offset = 0; |
| 173 | len = size; |
| 174 | } |
| 175 | |
| 176 | first_page = offset & ~(PAGE_SIZE-1); |
| 177 | last_page = (offset + len + PAGE_SIZE) & ~(PAGE_SIZE-1); |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 178 | |
| 179 | linear = gem_mmap__wc(fd, handle, first_page, last_page - first_page, PROT_READ); |
| 180 | igt_assert(linear); |
| 181 | |
| 182 | /* Translate from offsets in the read buffer to the swizzled |
| 183 | * address that it corresponds to. This is the opposite of |
| 184 | * what Mesa does (calculate offset to be read given the linear |
| 185 | * offset it's looking for). |
| 186 | */ |
| 187 | for (j = offset; j < offset + len; j += 4) { |
| 188 | uint32_t expected_val, found_val; |
| 189 | int swizzled_offset; |
| 190 | const char *swizzle_str; |
| 191 | |
| 192 | switch (swizzle) { |
| 193 | case I915_BIT_6_SWIZZLE_NONE: |
| 194 | swizzled_offset = j; |
| 195 | swizzle_str = "none"; |
| 196 | break; |
| 197 | case I915_BIT_6_SWIZZLE_9: |
| 198 | swizzled_offset = j ^ |
| 199 | swizzle_bit(9, j); |
| 200 | swizzle_str = "bit9"; |
| 201 | break; |
| 202 | case I915_BIT_6_SWIZZLE_9_10: |
| 203 | swizzled_offset = j ^ |
| 204 | swizzle_bit(9, j) ^ |
| 205 | swizzle_bit(10, j); |
| 206 | swizzle_str = "bit9^10"; |
| 207 | break; |
| 208 | case I915_BIT_6_SWIZZLE_9_11: |
| 209 | swizzled_offset = j ^ |
| 210 | swizzle_bit(9, j) ^ |
| 211 | swizzle_bit(11, j); |
| 212 | swizzle_str = "bit9^11"; |
| 213 | break; |
| 214 | case I915_BIT_6_SWIZZLE_9_10_11: |
| 215 | swizzled_offset = j ^ |
| 216 | swizzle_bit(9, j) ^ |
| 217 | swizzle_bit(10, j) ^ |
| 218 | swizzle_bit(11, j); |
| 219 | swizzle_str = "bit9^10^11"; |
| 220 | break; |
| 221 | default: |
| 222 | igt_skip("unknown swizzling"); |
| 223 | break; |
| 224 | } |
Chris Wilson | 5e9fac5 | 2015-01-22 07:52:09 +0000 | [diff] [blame] | 225 | igt_debug("Checking offset %d swizzled %s -> %d\n", |
| 226 | j, swizzle_str, swizzled_offset); |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 227 | expected_val = calculate_expected(swizzled_offset); |
Chris Wilson | 7848d21 | 2015-01-27 09:38:34 +0000 | [diff] [blame^] | 228 | found_val = linear[(j - first_page)/ 4]; |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 229 | igt_assert_f(expected_val == found_val, |
| 230 | "Bad read [%d]: %d instead of %d at 0x%08x " |
| 231 | "for read from 0x%08x to 0x%08x, swizzle=%s\n", |
| 232 | i, found_val, expected_val, j, |
| 233 | offset, offset + len, |
| 234 | swizzle_str); |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 235 | } |
Chris Wilson | 5e9fac5 | 2015-01-22 07:52:09 +0000 | [diff] [blame] | 236 | munmap(linear, last_page - first_page); |
Chris Wilson | e70c789 | 2015-01-02 16:33:30 +0530 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | close(fd); |
| 240 | } |