/* * 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 #include #include #include #include #include #include #include #include #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); 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; } static void get_tiling(int fd, uint32_t handle, uint32_t *tiling, uint32_t *swizzle) { struct drm_i915_gem_get_tiling2 { uint32_t handle; uint32_t tiling_mode; uint32_t swizzle_mode; uint32_t phys_swizzle_mode; } arg; #define DRM_IOCTL_I915_GEM_GET_TILING2 DRM_IOWR (DRM_COMMAND_BASE + DRM_I915_GEM_GET_TILING, struct drm_i915_gem_get_tiling2) memset(&arg, 0, sizeof(arg)); arg.handle = handle; do_ioctl(fd, DRM_IOCTL_I915_GEM_GET_TILING2, &arg); igt_require(arg.phys_swizzle_mode == arg.swizzle_mode); *tiling = arg.tiling_mode; *swizzle = arg.swizzle_mode; } 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); 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-1); last_page = (offset + len + PAGE_SIZE) & ~(PAGE_SIZE-1); 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); }