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/*
* 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.
*/
/** @file gem_tiled_wc.c
*
* This is a test of write-combining mmap's behavior on tiled objects
* with respect to the reported swizzling value.
*
* The goal is to exercise the complications that arise when using a linear
* view of a tiled object that is subject to hardware swizzling. This is
* useful to check that we are presenting the correct view of the object
* to userspace, and that userspace has to respect the swizzle.
*/
#include "igt.h"
#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"
#define WIDTH 512
#define HEIGHT 512
#define SIZE (WIDTH*HEIGHT*sizeof(uint32_t))
#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, SIZE);
gem_set_tiling(fd, handle, I915_TILING_X, WIDTH * sizeof(uint32_t));
/* Fill the BO with dwords starting at start_val */
data = gem_mmap__gtt(fd, handle, SIZE, PROT_READ | PROT_WRITE);
gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
for (i = 0; i < WIDTH*HEIGHT; i++)
data[i] = i;
munmap(data, SIZE);
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("%s(%d): %3d, %3d, %3d,%3d = %d\n",
__func__, offset, base_x, base_y, tile_x, tile_y,
(base_y + tile_y) * WIDTH + base_x + tile_x);
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;
fd = drm_open_driver(DRIVER_INTEL);
gem_require_mmap_wc(fd);
handle = create_bo(fd);
igt_require(gem_get_tiling(fd, handle, &tiling, &swizzle));
if (IS_GEN2(intel_get_drm_devid(fd))) {
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 first_page, last_page;
uint32_t *linear;
int j;
if (len == 0)
len = 4;
if (offset + len > size)
len = size - offset;
if (i == 0) {
offset = 0;
len = size;
}
first_page = offset & -PAGE_SIZE;
last_page = (offset + len + PAGE_SIZE - 1) & -PAGE_SIZE;
linear = gem_mmap__wc(fd, handle, first_page, last_page - first_page, PROT_READ);
/* 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_skip("unknown swizzling");
break;
}
igt_debug("Checking offset %d swizzled %s -> %d\n",
j, swizzle_str, swizzled_offset);
expected_val = calculate_expected(swizzled_offset);
found_val = linear[(j - first_page)/ 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);
}
munmap(linear, last_page - first_page);
}
close(fd);
}
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