freebsd-skq/sys/dev/ioat/ioat_test.c

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/*-
* Copyright (C) 2012 Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/ioccom.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/stdarg.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include "ioat.h"
#include "ioat_hw.h"
#include "ioat_internal.h"
#include "ioat_test.h"
#ifndef time_after
#define time_after(a,b) ((long)(b) - (long)(a) < 0)
#endif
MALLOC_DEFINE(M_IOAT_TEST, "ioat_test", "ioat test allocations");
#define IOAT_MAX_BUFS 256
struct test_transaction {
void *buf[IOAT_MAX_BUFS];
uint32_t length;
uint32_t depth;
struct ioat_test *test;
TAILQ_ENTRY(test_transaction) entry;
};
#define IT_LOCK() mtx_lock(&ioat_test_lk)
#define IT_UNLOCK() mtx_unlock(&ioat_test_lk)
#define IT_ASSERT() mtx_assert(&ioat_test_lk, MA_OWNED)
static struct mtx ioat_test_lk;
MTX_SYSINIT(ioat_test_lk, &ioat_test_lk, "test coordination mtx", MTX_DEF);
static int g_thread_index = 1;
static struct cdev *g_ioat_cdev = NULL;
#define ioat_test_log(v, ...) _ioat_test_log((v), "ioat_test: " __VA_ARGS__)
static inline void _ioat_test_log(int verbosity, const char *fmt, ...);
static void
ioat_test_transaction_destroy(struct test_transaction *tx)
{
int i;
for (i = 0; i < IOAT_MAX_BUFS; i++) {
if (tx->buf[i] != NULL) {
contigfree(tx->buf[i], tx->length, M_IOAT_TEST);
tx->buf[i] = NULL;
}
}
free(tx, M_IOAT_TEST);
}
static struct
test_transaction *ioat_test_transaction_create(unsigned num_buffers,
uint32_t buffer_size)
{
struct test_transaction *tx;
unsigned i;
tx = malloc(sizeof(*tx), M_IOAT_TEST, M_NOWAIT | M_ZERO);
if (tx == NULL)
return (NULL);
tx->length = buffer_size;
for (i = 0; i < num_buffers; i++) {
tx->buf[i] = contigmalloc(buffer_size, M_IOAT_TEST, M_NOWAIT,
0, BUS_SPACE_MAXADDR, PAGE_SIZE, 0);
if (tx->buf[i] == NULL) {
ioat_test_transaction_destroy(tx);
return (NULL);
}
}
return (tx);
}
static bool
ioat_compare_ok(struct test_transaction *tx)
{
uint32_t i;
for (i = 0; i < tx->depth; i++) {
if (memcmp(tx->buf[2*i], tx->buf[2*i+1], tx->length) != 0)
return (false);
}
return (true);
}
static void
ioat_dma_test_callback(void *arg)
{
struct test_transaction *tx;
struct ioat_test *test;
tx = arg;
test = tx->test;
if (test->verify && !ioat_compare_ok(tx)) {
ioat_test_log(0, "miscompare found\n");
atomic_add_32(&test->status[IOAT_TEST_MISCOMPARE], tx->depth);
} else if (!test->too_late)
atomic_add_32(&test->status[IOAT_TEST_OK], tx->depth);
IT_LOCK();
TAILQ_REMOVE(&test->pend_q, tx, entry);
TAILQ_INSERT_TAIL(&test->free_q, tx, entry);
wakeup(&test->free_q);
IT_UNLOCK();
}
static int
ioat_test_prealloc_memory(struct ioat_test *test, int index)
{
uint32_t i, j, k;
struct test_transaction *tx;
for (i = 0; i < test->transactions; i++) {
tx = ioat_test_transaction_create(test->chain_depth * 2,
test->buffer_size);
if (tx == NULL) {
ioat_test_log(0, "tx == NULL - memory exhausted\n");
test->status[IOAT_TEST_NO_MEMORY]++;
return (ENOMEM);
}
TAILQ_INSERT_HEAD(&test->free_q, tx, entry);
tx->test = test;
tx->depth = test->chain_depth;
/* fill in source buffers */
for (j = 0; j < (tx->length / sizeof(uint32_t)); j++) {
uint32_t val = j + (index << 28);
for (k = 0; k < test->chain_depth; k++) {
((uint32_t *)tx->buf[2*k])[j] = ~val;
((uint32_t *)tx->buf[2*k+1])[j] = val;
}
}
}
return (0);
}
static void
ioat_test_release_memory(struct ioat_test *test)
{
struct test_transaction *tx, *s;
TAILQ_FOREACH_SAFE(tx, &test->free_q, entry, s)
ioat_test_transaction_destroy(tx);
TAILQ_INIT(&test->free_q);
TAILQ_FOREACH_SAFE(tx, &test->pend_q, entry, s)
ioat_test_transaction_destroy(tx);
TAILQ_INIT(&test->pend_q);
}
static void
ioat_test_submit_1_tx(struct ioat_test *test, bus_dmaengine_t dma)
{
struct test_transaction *tx;
struct bus_dmadesc *desc;
bus_dmaengine_callback_t cb;
bus_addr_t src, dest;
uint32_t i, flags;
IT_LOCK();
while (TAILQ_EMPTY(&test->free_q))
msleep(&test->free_q, &ioat_test_lk, 0, "test_submit", 0);
tx = TAILQ_FIRST(&test->free_q);
TAILQ_REMOVE(&test->free_q, tx, entry);
TAILQ_INSERT_HEAD(&test->pend_q, tx, entry);
IT_UNLOCK();
ioat_acquire(dma);
for (i = 0; i < tx->depth; i++) {
src = vtophys((vm_offset_t)tx->buf[2*i]);
dest = vtophys((vm_offset_t)tx->buf[2*i+1]);
if (i == tx->depth - 1) {
cb = ioat_dma_test_callback;
flags = DMA_INT_EN;
} else {
cb = NULL;
flags = 0;
}
desc = ioat_copy(dma, src, dest, tx->length, cb, tx, flags);
if (desc == NULL)
panic("Failed to allocate a ring slot "
"-- this shouldn't happen!");
}
ioat_release(dma);
}
static void
ioat_dma_test(void *arg)
{
struct ioat_test *test;
bus_dmaengine_t dmaengine;
uint32_t loops;
int index, rc, start, end;
test = arg;
memset(__DEVOLATILE(void *, test->status), 0, sizeof(test->status));
if (test->buffer_size > 1024 * 1024) {
ioat_test_log(0, "Buffer size too large >1MB\n");
test->status[IOAT_TEST_NO_MEMORY]++;
return;
}
if (test->chain_depth * 2 > IOAT_MAX_BUFS) {
ioat_test_log(0, "Depth too large (> %u)\n",
(unsigned)IOAT_MAX_BUFS / 2);
test->status[IOAT_TEST_NO_MEMORY]++;
return;
}
if (btoc((uint64_t)test->buffer_size * test->chain_depth *
test->transactions) > (physmem / 4)) {
ioat_test_log(0, "Sanity check failed -- test would "
"use more than 1/4 of phys mem.\n");
test->status[IOAT_TEST_NO_MEMORY]++;
return;
}
if ((uint64_t)test->transactions * test->chain_depth > (1<<16)) {
ioat_test_log(0, "Sanity check failed -- test would "
"use more than available IOAT ring space.\n");
test->status[IOAT_TEST_NO_MEMORY]++;
return;
}
dmaengine = ioat_get_dmaengine(test->channel_index);
if (dmaengine == NULL) {
ioat_test_log(0, "Couldn't acquire dmaengine\n");
test->status[IOAT_TEST_NO_DMA_ENGINE]++;
return;
}
index = g_thread_index++;
TAILQ_INIT(&test->free_q);
TAILQ_INIT(&test->pend_q);
if (test->duration == 0)
ioat_test_log(1, "Thread %d: num_loops remaining: 0x%08x\n",
index, test->transactions);
else
ioat_test_log(1, "Thread %d: starting\n", index);
rc = ioat_test_prealloc_memory(test, index);
if (rc != 0) {
ioat_test_log(0, "prealloc_memory: %d\n", rc);
return;
}
wmb();
test->too_late = false;
start = ticks;
end = start + (((sbintime_t)test->duration * hz) / 1000);
for (loops = 0;; loops++) {
if (test->duration == 0 && loops >= test->transactions)
break;
else if (test->duration != 0 && time_after(ticks, end)) {
test->too_late = true;
break;
}
ioat_test_submit_1_tx(test, dmaengine);
}
ioat_test_log(1, "Test Elapsed: %d ticks (overrun %d), %d sec.\n",
ticks - start, ticks - end, (ticks - start) / hz);
IT_LOCK();
while (!TAILQ_EMPTY(&test->pend_q))
msleep(&test->free_q, &ioat_test_lk, 0, "ioattestcompl", hz);
IT_UNLOCK();
ioat_test_log(1, "Test Elapsed2: %d ticks (overrun %d), %d sec.\n",
ticks - start, ticks - end, (ticks - start) / hz);
ioat_test_release_memory(test);
}
static int
ioat_test_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{
return (0);
}
static int
ioat_test_close(struct cdev *dev, int flags, int fmt, struct thread *td)
{
return (0);
}
static int
ioat_test_ioctl(struct cdev *dev, unsigned long cmd, caddr_t arg, int flag,
struct thread *td)
{
switch (cmd) {
case IOAT_DMATEST:
ioat_dma_test(arg);
break;
default:
return (EINVAL);
}
return (0);
}
static struct cdevsw ioat_cdevsw = {
.d_version = D_VERSION,
.d_flags = 0,
.d_open = ioat_test_open,
.d_close = ioat_test_close,
.d_ioctl = ioat_test_ioctl,
.d_name = "ioat_test",
};
static int
enable_ioat_test(bool enable)
{
mtx_assert(&Giant, MA_OWNED);
if (enable && g_ioat_cdev == NULL) {
g_ioat_cdev = make_dev(&ioat_cdevsw, 0, UID_ROOT, GID_WHEEL,
0600, "ioat_test");
} else if (!enable && g_ioat_cdev != NULL) {
destroy_dev(g_ioat_cdev);
g_ioat_cdev = NULL;
}
return (0);
}
static int
sysctl_enable_ioat_test(SYSCTL_HANDLER_ARGS)
{
int error, enabled;
enabled = (g_ioat_cdev != NULL);
error = sysctl_handle_int(oidp, &enabled, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
enable_ioat_test(enabled);
return (0);
}
SYSCTL_PROC(_hw_ioat, OID_AUTO, enable_ioat_test, CTLTYPE_INT | CTLFLAG_RW,
0, 0, sysctl_enable_ioat_test, "I",
"Non-zero: Enable the /dev/ioat_test device");
void
ioat_test_attach(void)
{
char *val;
val = kern_getenv("hw.ioat.enable_ioat_test");
if (val != NULL && strcmp(val, "0") != 0) {
mtx_lock(&Giant);
enable_ioat_test(true);
mtx_unlock(&Giant);
}
freeenv(val);
}
void
ioat_test_detach(void)
{
mtx_lock(&Giant);
enable_ioat_test(false);
mtx_unlock(&Giant);
}
static inline void
_ioat_test_log(int verbosity, const char *fmt, ...)
{
va_list argp;
if (verbosity > g_ioat_debug_level)
return;
va_start(argp, fmt);
vprintf(fmt, argp);
va_end(argp);
}