1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* Copyright © 2009 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
/** @file gem_tiled_pread.c
*
* This is a test of pread's behavior on tiled objects with respect to the
* reported swizzling value.
*
* The goal is to exercise the slow_bit17_copy path for reading on bit17
* machines, but will also be useful for catching swizzling value bugs on
* other systems.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include "drm.h"
#include "ioctl_wrappers.h"
#include "drmtest.h"
#include "intel_io.h"
#include "intel_chipset.h"
#define WIDTH 512
#define HEIGHT 512
static uint32_t linear[WIDTH * HEIGHT];
#define PAGE_SIZE 4096
static int tile_width;
static int tile_height;
static int tile_size;
static uint32_t
create_bo(int fd)
{
uint32_t handle;
uint32_t *data;
int i;
handle = gem_create(fd, sizeof(linear));
gem_set_tiling(fd, handle, I915_TILING_X, WIDTH * sizeof(uint32_t));
/* Fill the BO with dwords starting at start_val */
data = gem_mmap(fd, handle, sizeof(linear), PROT_READ | PROT_WRITE);
for (i = 0; i < WIDTH*HEIGHT; i++)
data[i] = i;
munmap(data, sizeof(linear));
return handle;
}
static int
swizzle_bit(int bit, int offset)
{
return (offset & (1 << bit)) >> (bit - 6);
}
/* Translate from a swizzled offset in the tiled buffer to the corresponding
* value from the original linear buffer.
*/
static uint32_t
calculate_expected(int offset)
{
int tile_off = offset & (tile_size - 1);
int tile_base = offset & -tile_size;
int tile_index = tile_base / tile_size;
int tiles_per_row = 4*WIDTH / tile_width;
/* base x,y values from the tile (page) index. */
int base_y = tile_index / tiles_per_row * tile_height;
int base_x = tile_index % tiles_per_row * (tile_width/4);
/* x, y offsets within the tile */
int tile_y = tile_off / tile_width;
int tile_x = (tile_off % tile_width) / 4;
igt_debug("%3d, %3d, %3d,%3d\n", base_x, base_y, tile_x, tile_y);
return (base_y + tile_y) * WIDTH + base_x + tile_x;
}
igt_simple_main
{
int fd;
int i, iter = 100;
uint32_t tiling, swizzle;
uint32_t handle;
uint32_t devid;
fd = drm_open_any();
handle = create_bo(fd);
gem_get_tiling(fd, handle, &tiling, &swizzle);
devid = intel_get_drm_devid(fd);
if (IS_GEN2(devid)) {
tile_height = 16;
tile_width = 128;
tile_size = 2048;
} else {
tile_height = 8;
tile_width = 512;
tile_size = PAGE_SIZE;
}
/* Read a bunch of random subsets of the data and check that they come
* out right.
*/
for (i = 0; i < iter; i++) {
int size = WIDTH * HEIGHT * 4;
int offset = (random() % size) & ~3;
int len = (random() % size) & ~3;
int j;
if (len == 0)
len = 4;
if (offset + len > size)
len = size - offset;
if (i == 0) {
offset = 0;
len = size;
}
gem_read(fd, handle, offset, linear, len);
/* Translate from offsets in the read buffer to the swizzled
* address that it corresponds to. This is the opposite of
* what Mesa does (calculate offset to be read given the linear
* offset it's looking for).
*/
for (j = offset; j < offset + len; j += 4) {
uint32_t expected_val, found_val;
int swizzled_offset;
const char *swizzle_str;
switch (swizzle) {
case I915_BIT_6_SWIZZLE_NONE:
swizzled_offset = j;
swizzle_str = "none";
break;
case I915_BIT_6_SWIZZLE_9:
swizzled_offset = j ^
swizzle_bit(9, j);
swizzle_str = "bit9";
break;
case I915_BIT_6_SWIZZLE_9_10:
swizzled_offset = j ^
swizzle_bit(9, j) ^
swizzle_bit(10, j);
swizzle_str = "bit9^10";
break;
case I915_BIT_6_SWIZZLE_9_11:
swizzled_offset = j ^
swizzle_bit(9, j) ^
swizzle_bit(11, j);
swizzle_str = "bit9^11";
break;
case I915_BIT_6_SWIZZLE_9_10_11:
swizzled_offset = j ^
swizzle_bit(9, j) ^
swizzle_bit(10, j) ^
swizzle_bit(11, j);
swizzle_str = "bit9^10^11";
break;
default:
igt_assert_f(0, "Bad swizzle bits; %d\n",
swizzle);
}
expected_val = calculate_expected(swizzled_offset);
found_val = linear[(j - offset) / 4];
igt_assert_f(expected_val == found_val,
"Bad read [%d]: %d instead of %d at 0x%08x "
"for read from 0x%08x to 0x%08x, swizzle=%s\n",
i, found_val, expected_val, j,
offset, offset + len,
swizzle_str);
}
}
close(fd);
}
|
