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/*
* Copyright © 2011 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:
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#include <linux/userfaultfd.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include "drm.h"
#include "i915/gem_create.h"
#include "igt.h"
#include "igt_rand.h"
#include "igt_vgem.h"
#define MiB(x) ((x) * 1024 * 1024)
typedef void *(*mmap_fn_t)(int, uint32_t, uint64_t, uint64_t, unsigned int);
static void *wrap_gem_mmap__gtt(int i915, uint32_t handle,
uint64_t offset, uint64_t length,
unsigned int prot)
{
return gem_mmap__gtt(i915, handle, length, prot);
}
static void pwrite_self(int i915)
{
int start = gem_has_mappable_ggtt(i915) ? 0 : 1;
static const mmap_fn_t mmap_fn[] = {
wrap_gem_mmap__gtt,
gem_mmap__cpu,
gem_mmap__wc,
NULL
};
for (const mmap_fn_t *fn = mmap_fn + start; *fn; fn++) {
uint32_t handle = gem_create(i915, MiB(4));
void *ptr = (*fn)(i915, handle, 0, MiB(4), PROT_READ);
gem_write(i915, handle, 0, ptr + MiB(3), MiB(1));
gem_write(i915, handle, MiB(3), ptr, MiB(1));
gem_write(i915, handle, MiB(1), ptr + MiB(1), MiB(2));
munmap(ptr, MiB(4));
gem_close(i915, handle);
}
}
#define OBJECT_SIZE 16384
#define COPY_BLT_CMD (2<<29|0x53<<22|0x6)
#define BLT_WRITE_ALPHA (1<<21)
#define BLT_WRITE_RGB (1<<20)
#define BLT_SRC_TILED (1<<15)
#define BLT_DST_TILED (1<<11)
static void do_gem_write(int fd, uint32_t handle, void *buf, int len, int loops)
{
while (loops--)
gem_write(fd, handle, 0, buf, len);
}
static double elapsed(const struct timeval *start,
const struct timeval *end,
int loop)
{
return (1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec))/loop;
}
static const char *bytes_per_sec(char *buf, double v)
{
const char *order[] = {
"",
"KiB",
"MiB",
"GiB",
"TiB",
NULL,
}, **o = order;
while (v > 1000 && o[1]) {
v /= 1000;
o++;
}
sprintf(buf, "%.1f%s/s", v, *o);
return buf;
}
#define FORWARD 0x1
#define BACKWARD 0x2
#define RANDOM 0x4
static void test_big_cpu(int fd, int scale, unsigned flags)
{
uint64_t offset, size;
uint32_t handle;
switch (scale) {
case 0:
size = gem_mappable_aperture_size(fd) + 4096;
break;
case 1:
size = gem_global_aperture_size(fd) + 4096;
break;
case 2:
size = gem_aperture_size(fd) + 4096;
break;
}
igt_require_memory(1, size, CHECK_RAM);
handle = gem_create(fd, size);
gem_set_domain(fd, handle, I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
if (flags & FORWARD) {
igt_debug("Forwards\n");
for (offset = 0; offset < size; offset += 4096) {
int suboffset = (offset >> 12) % (4096 - sizeof(offset));
uint64_t tmp;
gem_write(fd, handle, offset + suboffset, &offset, sizeof(offset));
gem_read(fd, handle, offset + suboffset, &tmp, sizeof(tmp));
igt_assert_eq_u64(offset, tmp);
}
}
if (flags & BACKWARD) {
igt_debug("Backwards\n");
for (offset = size >> 12; offset--; ) {
int suboffset = 4096 - (offset % (4096 - sizeof(offset)));
uint64_t tmp;
gem_write(fd, handle, (offset<<12) + suboffset, &offset, sizeof(offset));
gem_read(fd, handle, (offset<<12) + suboffset, &tmp, sizeof(tmp));
igt_assert_eq_u64(offset, tmp);
}
}
if (flags & RANDOM) {
igt_debug("Random\n");
for (offset = 0; offset < size >> 12; offset++) {
uint64_t tmp = rand() % (size >> 12);
int suboffset = tmp % (4096 - sizeof(offset));
gem_write(fd, handle, (tmp << 12) + suboffset, &offset, sizeof(offset));
gem_read(fd, handle, (tmp << 12) + suboffset, &tmp, sizeof(tmp));
igt_assert_eq_u64(offset, tmp);
}
}
gem_close(fd, handle);
}
static void test_big_gtt(int fd, int scale, unsigned flags)
{
uint64_t offset, size;
uint64_t *ptr;
uint32_t handle;
igt_require(gem_mmap__has_wc(fd));
switch (scale) {
case 0:
size = gem_mappable_aperture_size(fd) + 4096;
break;
case 1:
size = gem_global_aperture_size(fd) + 4096;
break;
case 2:
size = gem_aperture_size(fd) + 4096;
break;
}
igt_require_memory(1, size, CHECK_RAM);
handle = gem_create(fd, size);
gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
ptr = gem_mmap__wc(fd, handle, 0, size, PROT_READ);
if (flags & FORWARD) {
igt_debug("Forwards\n");
for (offset = 0; offset < size; offset += 4096) {
int suboffset = (offset >> 12) % (4096 / sizeof(offset) - 1) * sizeof(offset);
gem_write(fd, handle, offset + suboffset, &offset, sizeof(offset));
gem_set_domain(fd, handle, I915_GEM_DOMAIN_WC, 0);
igt_assert_eq_u64(ptr[(offset + suboffset)/sizeof(offset)], offset);
}
}
if (flags & BACKWARD) {
igt_debug("Backwards\n");
for (offset = size >> 12; offset--; ) {
int suboffset = (4096 - (offset % (4096 - sizeof(offset)))) & -sizeof(offset);
gem_write(fd, handle, (offset<<12) + suboffset, &offset, sizeof(offset));
gem_set_domain(fd, handle, I915_GEM_DOMAIN_WC, 0);
igt_assert_eq_u64(ptr[((offset<<12) + suboffset)/sizeof(offset)], offset);
}
}
if (flags & RANDOM) {
igt_debug("Random\n");
for (offset = 0; offset < size >> 12; offset++) {
uint64_t tmp = rand() % (size >> 12);
int suboffset = (tmp % 4096) & -sizeof(offset);
tmp = (tmp << 12) + suboffset;
gem_write(fd, handle, tmp, &offset, sizeof(offset));
gem_set_domain(fd, handle, I915_GEM_DOMAIN_WC, 0);
igt_assert_eq_u64(ptr[tmp/sizeof(offset)], offset);
}
}
munmap(ptr, size);
gem_close(fd, handle);
}
static void test_random(int fd)
{
uint32_t prng = 0xdeadbeef;
unsigned long count;
uint32_t handle;
uint64_t *map;
uint64_t size;
gem_require_mmap_wc(fd);
size = min(igt_get_total_ram_mb() / 2,
gem_mappable_aperture_size(fd) + 4096);
igt_require_memory(1, size, CHECK_RAM);
handle = gem_create(fd, size);
map = gem_mmap__wc(fd, handle, 0, size, PROT_WRITE);
count = 0;
igt_until_timeout(5) {
uint64_t a = hars_petruska_f54_1_random64(&prng) % (size / sizeof(uint64_t));
uint64_t x = hars_petruska_f54_1_random64(&prng);
gem_write(fd, handle, a * sizeof(x), &x, sizeof(x));
gem_set_domain(fd, handle, I915_GEM_DOMAIN_WC, 0);
igt_assert_eq_u64(map[a], x);
count++;
}
igt_info("Completed %lu cycles\n", count);
munmap(map, handle);
gem_close(fd, handle);
}
static int userfaultfd(int flags)
{
return syscall(SYS_userfaultfd, flags);
}
struct ufd_thread {
uint32_t *page;
int i915;
int vgem;
int err;
};
static int __prime_handle_to_fd(int fd, uint32_t handle)
{
struct drm_prime_handle args;
memset(&args, 0, sizeof(args));
args.handle = handle;
args.flags = DRM_CLOEXEC;
args.fd = -1;
ioctl(fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
return args.fd;
}
static uint32_t dmabuf_create_handle(int i915, int vgem)
{
struct vgem_bo scratch;
uint32_t handle;
int dmabuf;
scratch.width = 64;
scratch.height = 64;
scratch.bpp = 32;
vgem_create(vgem, &scratch);
dmabuf = __prime_handle_to_fd(vgem, scratch.handle);
if (dmabuf < 0)
return 0;
handle = prime_fd_to_handle(i915, dmabuf);
close(dmabuf);
return handle;
}
static void *ufd_thread(void *arg)
{
struct ufd_thread *t = arg;
uint32_t handle = dmabuf_create_handle(t->i915, t->vgem);
int err;
err = -EMFILE;
if (handle) {
err = __gem_write(t->i915, handle, 0, t->page, 1);
gem_close(t->i915, handle);
}
if (err)
t->err = err;
return NULL;
}
static void write_value(const char *path, int value)
{
char buf[80];
int fd, len;
len = sprintf(buf, "%d", value);
if (len < 0)
return;
fd = open(path, O_WRONLY);
if (fd != -1) {
write(fd, buf, len);
close(fd);
}
}
static void unlimited_processes(unsigned int limit)
{
struct rlimit rlim;
write_value("/proc/sys/kernel/threads-max", 150000);
write_value("/proc/sys/vm/max_map_count", 500000);
write_value("/proc/sys/kernel/pid_max", 200000);
if (getrlimit(RLIMIT_NPROC, &rlim))
return;
rlim.rlim_cur = limit;
rlim.rlim_max = limit;
setrlimit(RLIMIT_NPROC, &rlim);
}
static void test_exhaustion(int i915)
{
struct uffdio_api api = { .api = UFFD_API };
struct uffdio_register reg;
struct uffdio_copy copy;
struct ufd_thread t = {
.i915 = i915,
.vgem = drm_open_driver(DRIVER_VGEM),
};
pthread_t *thread = NULL;
struct uffd_msg msg;
unsigned long count;
char buf[4096];
int ufd;
unlimited_processes(1024 * 1024);
ufd = userfaultfd(0);
igt_require_f(ufd != -1, "kernel support for userfaultfd\n");
igt_require_f(ioctl(ufd, UFFDIO_API, &api) == 0 && api.api == UFFD_API,
"userfaultfd API v%lld:%lld\n", UFFD_API, api.api);
t.page = mmap(NULL, 4096, PROT_WRITE, MAP_SHARED | MAP_ANON, 0, 0);
igt_assert(t.page != MAP_FAILED);
/* Register our fault handler for t.page */
memset(®, 0, sizeof(reg));
reg.mode = UFFDIO_REGISTER_MODE_MISSING;
reg.range.start = to_user_pointer(t.page);
reg.range.len = 4096;
do_ioctl(ufd, UFFDIO_REGISTER, ®);
count = 0;
while (!READ_ONCE(t.err)) {
if (is_power_of_two(count)) {
unsigned long sz = count ? 2 * count : 1;
thread = realloc(thread, sz * sizeof(*thread));
igt_assert(thread);
}
if (pthread_create(&thread[count], NULL, ufd_thread, &t))
break;
if (count == 0) { /* Wait for the first userfault */
igt_assert_eq(read(ufd, &msg, sizeof(msg)), sizeof(msg));
igt_assert_eq(msg.event, UFFD_EVENT_PAGEFAULT);
igt_assert(from_user_pointer(msg.arg.pagefault.address) == t.page);
}
count++;
}
igt_assert(count);
if (t.err)
igt_warn("err:%d after %lu threads\n", t.err, count);
/* Service the fault; releasing the stuck ioctls */
memset(©, 0, sizeof(copy));
copy.dst = msg.arg.pagefault.address;
copy.src = to_user_pointer(memset(buf, 0xc5, sizeof(buf)));
copy.len = 4096;
do_ioctl(ufd, UFFDIO_COPY, ©);
while (count--)
pthread_join(thread[count], NULL);
free(thread);
munmap(t.page, 4096);
close(ufd);
close(t.vgem);
}
uint32_t *src, dst;
int fd;
int object_size = 0;
static int opt_handler(int opt, int opt_index, void *data)
{
switch (opt) {
case 's':
object_size = atoi(optarg);
break;
default:
return IGT_OPT_HANDLER_ERROR;
}
return IGT_OPT_HANDLER_SUCCESS;
}
const char *help_str = " -s\tObject size in bytes\n";
igt_main_args("s:", NULL, help_str, opt_handler, NULL)
{
double usecs;
const char* bps;
char buf[100];
int count;
const struct {
int level;
const char *name;
} cache[] = {
{ 0, "uncached" },
{ 1, "snoop" },
{ 2, "display" },
{ -1 },
}, *c;
if (object_size == 0)
object_size = OBJECT_SIZE;
object_size = (object_size + 3) & -4;
igt_fixture {
fd = drm_open_driver(DRIVER_INTEL);
gem_require_pread_pwrite(fd);
dst = gem_create(fd, object_size);
src = malloc(object_size);
}
igt_subtest("bench") {
for (count = 1; count <= 1<<17; count <<= 1) {
struct timeval start, end;
gettimeofday(&start, NULL);
do_gem_write(fd, dst, src, object_size, count);
gettimeofday(&end, NULL);
usecs = elapsed(&start, &end, count);
bps = bytes_per_sec(buf, object_size/usecs*1e6);
igt_info("Time to pwrite %d bytes x %6d: %7.3fµs, %s\n",
object_size, count, usecs, bps);
fflush(stdout);
}
}
igt_subtest("basic-self")
pwrite_self(fd);
igt_subtest("basic-exhaustion")
test_exhaustion(fd);
for (c = cache; c->level != -1; c++) {
igt_subtest(c->name) {
gem_set_caching(fd, dst, c->level);
for (count = 1; count <= 1<<17; count <<= 1) {
struct timeval start, end;
gettimeofday(&start, NULL);
do_gem_write(fd, dst, src, object_size, count);
gettimeofday(&end, NULL);
usecs = elapsed(&start, &end, count);
bps = bytes_per_sec(buf, object_size/usecs*1e6);
igt_info("Time to %s pwrite %d bytes x %6d: %7.3fµs, %s\n",
c->name, object_size, count, usecs, bps);
fflush(stdout);
}
}
}
igt_fixture {
free(src);
gem_close(fd, dst);
}
igt_subtest_f("basic-random")
test_random(fd);
{
const struct mode {
const char *name;
unsigned flags;
} modes[] = {
{ "forwards", FORWARD },
{ "backwards", BACKWARD },
{ "random", RANDOM },
{ "fbr", FORWARD | BACKWARD | RANDOM },
{ NULL },
}, *m;
for (m = modes; m->name; m++) {
igt_subtest_f("small-cpu-%s", m->name)
test_big_cpu(fd, 0, m->flags);
igt_subtest_f("small-gtt-%s", m->name)
test_big_gtt(fd, 0, m->flags);
igt_subtest_f("big-cpu-%s", m->name)
test_big_cpu(fd, 1, m->flags);
igt_subtest_f("big-gtt-%s", m->name)
test_big_gtt(fd, 1, m->flags);
igt_subtest_f("huge-cpu-%s", m->name)
test_big_cpu(fd, 2, m->flags);
igt_subtest_f("huge-gtt-%s", m->name)
test_big_gtt(fd, 2, m->flags);
}
}
igt_fixture
close(fd);
}
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