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Date: Wed, 18 Mar 2009 12:21:12 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: neilb@...e.de, maciej.sosnowski@...el.com
Subject: [PATCH 11/13] dmatest: add xor test
Extend dmatest to launch a thread per supported operation type and add
an xor test.
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/dma/dmatest.c | 274 ++++++++++++++++++++++++++++++++++---------------
1 files changed, 189 insertions(+), 85 deletions(-)
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index e190d8b..224acf4 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -38,6 +38,11 @@ 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.
@@ -59,8 +64,9 @@ struct dmatest_thread {
struct list_head node;
struct task_struct *task;
struct dma_chan *chan;
- u8 *srcbuf;
- u8 *dstbuf;
+ u8 **srcs;
+ u8 **dsts;
+ enum dma_transaction_type type;
};
struct dmatest_chan {
@@ -98,30 +104,37 @@ static unsigned long dmatest_random(void)
return buf;
}
-static void dmatest_init_srcbuf(u8 *buf, unsigned int start, unsigned int len)
+static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
{
unsigned int i;
-
- 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);
+ 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_dstbuf(u8 *buf, unsigned int start, unsigned int len)
+static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
{
unsigned int i;
-
- 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);
+ 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,
@@ -150,23 +163,30 @@ static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
thread_name, index, expected, actual);
}
-static unsigned int dmatest_verify(u8 *buf, unsigned int start,
+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;
-
- for (i = start; i < end; i++) {
- actual = buf[i];
- if (actual != (pattern | (~counter & PATTERN_COUNT_MASK))) {
- if (error_count < 32)
- dmatest_mismatch(actual, pattern, i, counter,
- is_srcbuf);
- error_count++;
+ 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++;
}
- counter++;
}
if (error_count > 32)
@@ -178,10 +198,10 @@ static unsigned int dmatest_verify(u8 *buf, unsigned int start,
/*
* This function repeatedly tests DMA transfers of various lengths and
- * offsets 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.
+ * 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
@@ -201,25 +221,53 @@ static int dmatest_func(void *data)
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;
- thread->srcbuf = kmalloc(test_buf_size, GFP_KERNEL);
- if (!thread->srcbuf)
- goto err_srcbuf;
- thread->dstbuf = kmalloc(test_buf_size, GFP_KERNEL);
- if (!thread->dstbuf)
- goto err_dstbuf;
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;
- dma_addr_t dma_src, dma_dest;
+ struct dma_async_tx_descriptor *tx = NULL;
+ dma_addr_t dma_srcs[src_cnt];
+ dma_addr_t dma_dsts[dst_cnt];
total_tests++;
@@ -227,22 +275,41 @@ static int dmatest_func(void *data)
src_off = dmatest_random() % (test_buf_size - len + 1);
dst_off = dmatest_random() % (test_buf_size - len + 1);
- dmatest_init_srcbuf(thread->srcbuf, src_off, len);
- dmatest_init_dstbuf(thread->dstbuf, dst_off, len);
+ 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_src = dma_map_single(dev->dev, thread->srcbuf + src_off,
- len, DMA_TO_DEVICE);
+ dma_srcs[i] = dma_map_single(dev->dev, buf, len,
+ DMA_TO_DEVICE);
+ }
/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
- dma_dest = dma_map_single(dev->dev, thread->dstbuf,
- test_buf_size, DMA_BIDIRECTIONAL);
+ 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);
- tx = dev->device_prep_dma_memcpy(chan, dma_dest + dst_off,
- dma_src, len,
- DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP);
if (!tx) {
- dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
- dma_unmap_single(dev->dev, dma_dest,
- test_buf_size, DMA_BIDIRECTIONAL);
+ 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,
@@ -263,11 +330,11 @@ static int dmatest_func(void *data)
failed_tests++;
continue;
}
- dma_async_memcpy_issue_pending(chan);
+ dma_async_issue_pending(chan);
do {
msleep(1);
- status = dma_async_memcpy_complete(
+ status = dma_async_is_tx_complete(
chan, cookie, NULL, NULL);
} while (status == DMA_IN_PROGRESS);
@@ -278,29 +345,30 @@ static int dmatest_func(void *data)
continue;
}
/* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
- dma_unmap_single(dev->dev, dma_dest,
- test_buf_size, DMA_BIDIRECTIONAL);
+ 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->srcbuf, 0, src_off,
+ error_count += dmatest_verify(thread->srcs, 0, src_off,
0, PATTERN_SRC, true);
- error_count += dmatest_verify(thread->srcbuf, src_off,
+ error_count += dmatest_verify(thread->srcs, src_off,
src_off + len, src_off,
PATTERN_SRC | PATTERN_COPY, true);
- error_count += dmatest_verify(thread->srcbuf, src_off + len,
+ 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->dstbuf, 0, dst_off,
+ error_count += dmatest_verify(thread->dsts, 0, dst_off,
0, PATTERN_DST, false);
- error_count += dmatest_verify(thread->dstbuf, dst_off,
+ error_count += dmatest_verify(thread->dsts, dst_off,
dst_off + len, src_off,
PATTERN_SRC | PATTERN_COPY, false);
- error_count += dmatest_verify(thread->dstbuf, dst_off + len,
+ error_count += dmatest_verify(thread->dsts, dst_off + len,
test_buf_size, dst_off + len,
PATTERN_DST, false);
@@ -319,10 +387,16 @@ static int dmatest_func(void *data)
}
ret = 0;
- kfree(thread->dstbuf);
+ for (i = 0; thread->dsts[i]; i++)
+ kfree(thread->dsts[i]);
err_dstbuf:
- kfree(thread->srcbuf);
+ 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;
@@ -344,35 +418,36 @@ static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
kfree(dtc);
}
-static int dmatest_add_channel(struct dma_chan *chan)
+static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
{
- struct dmatest_chan *dtc;
- struct dmatest_thread *thread;
- unsigned int i;
-
- dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
- if (!dtc) {
- pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
- return -ENOMEM;
- }
+ struct dmatest_thread *thread;
+ struct dma_chan *chan = dtc->chan;
+ char *op;
+ unsigned int i;
- dtc->chan = chan;
- INIT_LIST_HEAD(&dtc->threads);
+ 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-test%u\n",
- dma_chan_name(chan), i);
+ 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-test%u",
- dma_chan_name(chan), i);
+ 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-test%u\n",
- dma_chan_name(chan), i);
+ pr_warning("dmatest: Failed to run thread %s-%s%u\n",
+ dma_chan_name(chan), op, i);
kfree(thread);
break;
}
@@ -382,7 +457,36 @@ static int dmatest_add_channel(struct dma_chan *chan)
list_add_tail(&thread->node, &dtc->threads);
}
- pr_info("dmatest: Started %u threads using %s\n", i, dma_chan_name(chan));
+ 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++;
--
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