b54d5cb915
Extend dmatest to launch a thread per supported operation type and add an xor test. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
552 lines
14 KiB
C
552 lines
14 KiB
C
/*
|
|
* DMA Engine test module
|
|
*
|
|
* Copyright (C) 2007 Atmel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/delay.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/random.h>
|
|
#include <linux/wait.h>
|
|
|
|
static unsigned int test_buf_size = 16384;
|
|
module_param(test_buf_size, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
|
|
|
|
static char test_channel[20];
|
|
module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO);
|
|
MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
|
|
|
|
static char test_device[20];
|
|
module_param_string(device, test_device, sizeof(test_device), S_IRUGO);
|
|
MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
|
|
|
|
static unsigned int threads_per_chan = 1;
|
|
module_param(threads_per_chan, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(threads_per_chan,
|
|
"Number of threads to start per channel (default: 1)");
|
|
|
|
static unsigned int max_channels;
|
|
module_param(max_channels, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(max_channels,
|
|
"Maximum number of channels to use (default: all)");
|
|
|
|
static unsigned int xor_sources = 3;
|
|
module_param(xor_sources, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(xor_sources,
|
|
"Number of xor source buffers (default: 3)");
|
|
|
|
/*
|
|
* Initialization patterns. All bytes in the source buffer has bit 7
|
|
* set, all bytes in the destination buffer has bit 7 cleared.
|
|
*
|
|
* Bit 6 is set for all bytes which are to be copied by the DMA
|
|
* engine. Bit 5 is set for all bytes which are to be overwritten by
|
|
* the DMA engine.
|
|
*
|
|
* The remaining bits are the inverse of a counter which increments by
|
|
* one for each byte address.
|
|
*/
|
|
#define PATTERN_SRC 0x80
|
|
#define PATTERN_DST 0x00
|
|
#define PATTERN_COPY 0x40
|
|
#define PATTERN_OVERWRITE 0x20
|
|
#define PATTERN_COUNT_MASK 0x1f
|
|
|
|
struct dmatest_thread {
|
|
struct list_head node;
|
|
struct task_struct *task;
|
|
struct dma_chan *chan;
|
|
u8 **srcs;
|
|
u8 **dsts;
|
|
enum dma_transaction_type type;
|
|
};
|
|
|
|
struct dmatest_chan {
|
|
struct list_head node;
|
|
struct dma_chan *chan;
|
|
struct list_head threads;
|
|
};
|
|
|
|
/*
|
|
* These are protected by dma_list_mutex since they're only used by
|
|
* the DMA filter function callback
|
|
*/
|
|
static LIST_HEAD(dmatest_channels);
|
|
static unsigned int nr_channels;
|
|
|
|
static bool dmatest_match_channel(struct dma_chan *chan)
|
|
{
|
|
if (test_channel[0] == '\0')
|
|
return true;
|
|
return strcmp(dma_chan_name(chan), test_channel) == 0;
|
|
}
|
|
|
|
static bool dmatest_match_device(struct dma_device *device)
|
|
{
|
|
if (test_device[0] == '\0')
|
|
return true;
|
|
return strcmp(dev_name(device->dev), test_device) == 0;
|
|
}
|
|
|
|
static unsigned long dmatest_random(void)
|
|
{
|
|
unsigned long buf;
|
|
|
|
get_random_bytes(&buf, sizeof(buf));
|
|
return buf;
|
|
}
|
|
|
|
static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
|
|
{
|
|
unsigned int i;
|
|
u8 *buf;
|
|
|
|
for (; (buf = *bufs); bufs++) {
|
|
for (i = 0; i < start; i++)
|
|
buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
|
|
for ( ; i < start + len; i++)
|
|
buf[i] = PATTERN_SRC | PATTERN_COPY
|
|
| (~i & PATTERN_COUNT_MASK);;
|
|
for ( ; i < test_buf_size; i++)
|
|
buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
|
|
buf++;
|
|
}
|
|
}
|
|
|
|
static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
|
|
{
|
|
unsigned int i;
|
|
u8 *buf;
|
|
|
|
for (; (buf = *bufs); bufs++) {
|
|
for (i = 0; i < start; i++)
|
|
buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
|
|
for ( ; i < start + len; i++)
|
|
buf[i] = PATTERN_DST | PATTERN_OVERWRITE
|
|
| (~i & PATTERN_COUNT_MASK);
|
|
for ( ; i < test_buf_size; i++)
|
|
buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
|
|
}
|
|
}
|
|
|
|
static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
|
|
unsigned int counter, bool is_srcbuf)
|
|
{
|
|
u8 diff = actual ^ pattern;
|
|
u8 expected = pattern | (~counter & PATTERN_COUNT_MASK);
|
|
const char *thread_name = current->comm;
|
|
|
|
if (is_srcbuf)
|
|
pr_warning("%s: srcbuf[0x%x] overwritten!"
|
|
" Expected %02x, got %02x\n",
|
|
thread_name, index, expected, actual);
|
|
else if ((pattern & PATTERN_COPY)
|
|
&& (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
|
|
pr_warning("%s: dstbuf[0x%x] not copied!"
|
|
" Expected %02x, got %02x\n",
|
|
thread_name, index, expected, actual);
|
|
else if (diff & PATTERN_SRC)
|
|
pr_warning("%s: dstbuf[0x%x] was copied!"
|
|
" Expected %02x, got %02x\n",
|
|
thread_name, index, expected, actual);
|
|
else
|
|
pr_warning("%s: dstbuf[0x%x] mismatch!"
|
|
" Expected %02x, got %02x\n",
|
|
thread_name, index, expected, actual);
|
|
}
|
|
|
|
static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
|
|
unsigned int end, unsigned int counter, u8 pattern,
|
|
bool is_srcbuf)
|
|
{
|
|
unsigned int i;
|
|
unsigned int error_count = 0;
|
|
u8 actual;
|
|
u8 expected;
|
|
u8 *buf;
|
|
unsigned int counter_orig = counter;
|
|
|
|
for (; (buf = *bufs); bufs++) {
|
|
counter = counter_orig;
|
|
for (i = start; i < end; i++) {
|
|
actual = buf[i];
|
|
expected = pattern | (~counter & PATTERN_COUNT_MASK);
|
|
if (actual != expected) {
|
|
if (error_count < 32)
|
|
dmatest_mismatch(actual, pattern, i,
|
|
counter, is_srcbuf);
|
|
error_count++;
|
|
}
|
|
counter++;
|
|
}
|
|
}
|
|
|
|
if (error_count > 32)
|
|
pr_warning("%s: %u errors suppressed\n",
|
|
current->comm, error_count - 32);
|
|
|
|
return error_count;
|
|
}
|
|
|
|
/*
|
|
* This function repeatedly tests DMA transfers of various lengths and
|
|
* offsets for a given operation type until it is told to exit by
|
|
* kthread_stop(). There may be multiple threads running this function
|
|
* in parallel for a single channel, and there may be multiple channels
|
|
* being tested in parallel.
|
|
*
|
|
* Before each test, the source and destination buffer is initialized
|
|
* with a known pattern. This pattern is different depending on
|
|
* whether it's in an area which is supposed to be copied or
|
|
* overwritten, and different in the source and destination buffers.
|
|
* So if the DMA engine doesn't copy exactly what we tell it to copy,
|
|
* we'll notice.
|
|
*/
|
|
static int dmatest_func(void *data)
|
|
{
|
|
struct dmatest_thread *thread = data;
|
|
struct dma_chan *chan;
|
|
const char *thread_name;
|
|
unsigned int src_off, dst_off, len;
|
|
unsigned int error_count;
|
|
unsigned int failed_tests = 0;
|
|
unsigned int total_tests = 0;
|
|
dma_cookie_t cookie;
|
|
enum dma_status status;
|
|
enum dma_ctrl_flags flags;
|
|
int ret;
|
|
int src_cnt;
|
|
int dst_cnt;
|
|
int i;
|
|
|
|
thread_name = current->comm;
|
|
|
|
ret = -ENOMEM;
|
|
|
|
smp_rmb();
|
|
chan = thread->chan;
|
|
if (thread->type == DMA_MEMCPY)
|
|
src_cnt = dst_cnt = 1;
|
|
else if (thread->type == DMA_XOR) {
|
|
src_cnt = xor_sources | 1; /* force odd to ensure dst = src */
|
|
dst_cnt = 1;
|
|
} else
|
|
goto err_srcs;
|
|
|
|
thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
|
|
if (!thread->srcs)
|
|
goto err_srcs;
|
|
for (i = 0; i < src_cnt; i++) {
|
|
thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL);
|
|
if (!thread->srcs[i])
|
|
goto err_srcbuf;
|
|
}
|
|
thread->srcs[i] = NULL;
|
|
|
|
thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
|
|
if (!thread->dsts)
|
|
goto err_dsts;
|
|
for (i = 0; i < dst_cnt; i++) {
|
|
thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL);
|
|
if (!thread->dsts[i])
|
|
goto err_dstbuf;
|
|
}
|
|
thread->dsts[i] = NULL;
|
|
|
|
flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP;
|
|
|
|
while (!kthread_should_stop()) {
|
|
struct dma_device *dev = chan->device;
|
|
struct dma_async_tx_descriptor *tx = NULL;
|
|
dma_addr_t dma_srcs[src_cnt];
|
|
dma_addr_t dma_dsts[dst_cnt];
|
|
|
|
total_tests++;
|
|
|
|
len = dmatest_random() % test_buf_size + 1;
|
|
src_off = dmatest_random() % (test_buf_size - len + 1);
|
|
dst_off = dmatest_random() % (test_buf_size - len + 1);
|
|
|
|
dmatest_init_srcs(thread->srcs, src_off, len);
|
|
dmatest_init_dsts(thread->dsts, dst_off, len);
|
|
|
|
for (i = 0; i < src_cnt; i++) {
|
|
u8 *buf = thread->srcs[i] + src_off;
|
|
|
|
dma_srcs[i] = dma_map_single(dev->dev, buf, len,
|
|
DMA_TO_DEVICE);
|
|
}
|
|
/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
|
|
for (i = 0; i < dst_cnt; i++) {
|
|
dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
|
|
test_buf_size,
|
|
DMA_BIDIRECTIONAL);
|
|
}
|
|
|
|
if (thread->type == DMA_MEMCPY)
|
|
tx = dev->device_prep_dma_memcpy(chan,
|
|
dma_dsts[0] + dst_off,
|
|
dma_srcs[0], len,
|
|
flags);
|
|
else if (thread->type == DMA_XOR)
|
|
tx = dev->device_prep_dma_xor(chan,
|
|
dma_dsts[0] + dst_off,
|
|
dma_srcs, xor_sources,
|
|
len, flags);
|
|
|
|
if (!tx) {
|
|
for (i = 0; i < src_cnt; i++)
|
|
dma_unmap_single(dev->dev, dma_srcs[i], len,
|
|
DMA_TO_DEVICE);
|
|
for (i = 0; i < dst_cnt; i++)
|
|
dma_unmap_single(dev->dev, dma_dsts[i],
|
|
test_buf_size,
|
|
DMA_BIDIRECTIONAL);
|
|
pr_warning("%s: #%u: prep error with src_off=0x%x "
|
|
"dst_off=0x%x len=0x%x\n",
|
|
thread_name, total_tests - 1,
|
|
src_off, dst_off, len);
|
|
msleep(100);
|
|
failed_tests++;
|
|
continue;
|
|
}
|
|
tx->callback = NULL;
|
|
cookie = tx->tx_submit(tx);
|
|
|
|
if (dma_submit_error(cookie)) {
|
|
pr_warning("%s: #%u: submit error %d with src_off=0x%x "
|
|
"dst_off=0x%x len=0x%x\n",
|
|
thread_name, total_tests - 1, cookie,
|
|
src_off, dst_off, len);
|
|
msleep(100);
|
|
failed_tests++;
|
|
continue;
|
|
}
|
|
dma_async_issue_pending(chan);
|
|
|
|
do {
|
|
msleep(1);
|
|
status = dma_async_is_tx_complete(
|
|
chan, cookie, NULL, NULL);
|
|
} while (status == DMA_IN_PROGRESS);
|
|
|
|
if (status == DMA_ERROR) {
|
|
pr_warning("%s: #%u: error during copy\n",
|
|
thread_name, total_tests - 1);
|
|
failed_tests++;
|
|
continue;
|
|
}
|
|
/* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
|
|
for (i = 0; i < dst_cnt; i++)
|
|
dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
error_count = 0;
|
|
|
|
pr_debug("%s: verifying source buffer...\n", thread_name);
|
|
error_count += dmatest_verify(thread->srcs, 0, src_off,
|
|
0, PATTERN_SRC, true);
|
|
error_count += dmatest_verify(thread->srcs, src_off,
|
|
src_off + len, src_off,
|
|
PATTERN_SRC | PATTERN_COPY, true);
|
|
error_count += dmatest_verify(thread->srcs, src_off + len,
|
|
test_buf_size, src_off + len,
|
|
PATTERN_SRC, true);
|
|
|
|
pr_debug("%s: verifying dest buffer...\n",
|
|
thread->task->comm);
|
|
error_count += dmatest_verify(thread->dsts, 0, dst_off,
|
|
0, PATTERN_DST, false);
|
|
error_count += dmatest_verify(thread->dsts, dst_off,
|
|
dst_off + len, src_off,
|
|
PATTERN_SRC | PATTERN_COPY, false);
|
|
error_count += dmatest_verify(thread->dsts, dst_off + len,
|
|
test_buf_size, dst_off + len,
|
|
PATTERN_DST, false);
|
|
|
|
if (error_count) {
|
|
pr_warning("%s: #%u: %u errors with "
|
|
"src_off=0x%x dst_off=0x%x len=0x%x\n",
|
|
thread_name, total_tests - 1, error_count,
|
|
src_off, dst_off, len);
|
|
failed_tests++;
|
|
} else {
|
|
pr_debug("%s: #%u: No errors with "
|
|
"src_off=0x%x dst_off=0x%x len=0x%x\n",
|
|
thread_name, total_tests - 1,
|
|
src_off, dst_off, len);
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
for (i = 0; thread->dsts[i]; i++)
|
|
kfree(thread->dsts[i]);
|
|
err_dstbuf:
|
|
kfree(thread->dsts);
|
|
err_dsts:
|
|
for (i = 0; thread->srcs[i]; i++)
|
|
kfree(thread->srcs[i]);
|
|
err_srcbuf:
|
|
kfree(thread->srcs);
|
|
err_srcs:
|
|
pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
|
|
thread_name, total_tests, failed_tests, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
|
|
{
|
|
struct dmatest_thread *thread;
|
|
struct dmatest_thread *_thread;
|
|
int ret;
|
|
|
|
list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
|
|
ret = kthread_stop(thread->task);
|
|
pr_debug("dmatest: thread %s exited with status %d\n",
|
|
thread->task->comm, ret);
|
|
list_del(&thread->node);
|
|
kfree(thread);
|
|
}
|
|
kfree(dtc);
|
|
}
|
|
|
|
static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
|
|
{
|
|
struct dmatest_thread *thread;
|
|
struct dma_chan *chan = dtc->chan;
|
|
char *op;
|
|
unsigned int i;
|
|
|
|
if (type == DMA_MEMCPY)
|
|
op = "copy";
|
|
else if (type == DMA_XOR)
|
|
op = "xor";
|
|
else
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < threads_per_chan; i++) {
|
|
thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
|
|
if (!thread) {
|
|
pr_warning("dmatest: No memory for %s-%s%u\n",
|
|
dma_chan_name(chan), op, i);
|
|
|
|
break;
|
|
}
|
|
thread->chan = dtc->chan;
|
|
thread->type = type;
|
|
smp_wmb();
|
|
thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
|
|
dma_chan_name(chan), op, i);
|
|
if (IS_ERR(thread->task)) {
|
|
pr_warning("dmatest: Failed to run thread %s-%s%u\n",
|
|
dma_chan_name(chan), op, i);
|
|
kfree(thread);
|
|
break;
|
|
}
|
|
|
|
/* srcbuf and dstbuf are allocated by the thread itself */
|
|
|
|
list_add_tail(&thread->node, &dtc->threads);
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static int dmatest_add_channel(struct dma_chan *chan)
|
|
{
|
|
struct dmatest_chan *dtc;
|
|
struct dma_device *dma_dev = chan->device;
|
|
unsigned int thread_count = 0;
|
|
unsigned int cnt;
|
|
|
|
dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
|
|
if (!dtc) {
|
|
pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dtc->chan = chan;
|
|
INIT_LIST_HEAD(&dtc->threads);
|
|
|
|
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
|
|
cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
|
|
thread_count += cnt > 0 ?: 0;
|
|
}
|
|
if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
|
|
cnt = dmatest_add_threads(dtc, DMA_XOR);
|
|
thread_count += cnt > 0 ?: 0;
|
|
}
|
|
|
|
pr_info("dmatest: Started %u threads using %s\n",
|
|
thread_count, dma_chan_name(chan));
|
|
|
|
list_add_tail(&dtc->node, &dmatest_channels);
|
|
nr_channels++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool filter(struct dma_chan *chan, void *param)
|
|
{
|
|
if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device))
|
|
return false;
|
|
else
|
|
return true;
|
|
}
|
|
|
|
static int __init dmatest_init(void)
|
|
{
|
|
dma_cap_mask_t mask;
|
|
struct dma_chan *chan;
|
|
int err = 0;
|
|
|
|
dma_cap_zero(mask);
|
|
dma_cap_set(DMA_MEMCPY, mask);
|
|
for (;;) {
|
|
chan = dma_request_channel(mask, filter, NULL);
|
|
if (chan) {
|
|
err = dmatest_add_channel(chan);
|
|
if (err == 0)
|
|
continue;
|
|
else {
|
|
dma_release_channel(chan);
|
|
break; /* add_channel failed, punt */
|
|
}
|
|
} else
|
|
break; /* no more channels available */
|
|
if (max_channels && nr_channels >= max_channels)
|
|
break; /* we have all we need */
|
|
}
|
|
|
|
return err;
|
|
}
|
|
/* when compiled-in wait for drivers to load first */
|
|
late_initcall(dmatest_init);
|
|
|
|
static void __exit dmatest_exit(void)
|
|
{
|
|
struct dmatest_chan *dtc, *_dtc;
|
|
struct dma_chan *chan;
|
|
|
|
list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
|
|
list_del(&dtc->node);
|
|
chan = dtc->chan;
|
|
dmatest_cleanup_channel(dtc);
|
|
pr_debug("dmatest: dropped channel %s\n",
|
|
dma_chan_name(chan));
|
|
dma_release_channel(chan);
|
|
}
|
|
}
|
|
module_exit(dmatest_exit);
|
|
|
|
MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
|
|
MODULE_LICENSE("GPL v2");
|