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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@intel.com>
This commit is contained in:
Dan Williams
parent
729b5d1b8e
commit
b54d5cb915
@ -38,6 +38,11 @@ module_param(max_channels, uint, S_IRUGO);
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MODULE_PARM_DESC(max_channels,
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"Maximum number of channels to use (default: all)");
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static unsigned int xor_sources = 3;
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module_param(xor_sources, uint, S_IRUGO);
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MODULE_PARM_DESC(xor_sources,
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"Number of xor source buffers (default: 3)");
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/*
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* Initialization patterns. All bytes in the source buffer has bit 7
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* set, all bytes in the destination buffer has bit 7 cleared.
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@ -59,8 +64,9 @@ struct dmatest_thread {
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struct list_head node;
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struct task_struct *task;
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struct dma_chan *chan;
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u8 *srcbuf;
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u8 *dstbuf;
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u8 **srcs;
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u8 **dsts;
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enum dma_transaction_type type;
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};
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struct dmatest_chan {
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@ -98,30 +104,37 @@ static unsigned long dmatest_random(void)
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return buf;
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}
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static void dmatest_init_srcbuf(u8 *buf, unsigned int start, unsigned int len)
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static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
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{
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unsigned int i;
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u8 *buf;
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for (i = 0; i < start; i++)
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buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
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for ( ; i < start + len; i++)
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buf[i] = PATTERN_SRC | PATTERN_COPY
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| (~i & PATTERN_COUNT_MASK);;
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for ( ; i < test_buf_size; i++)
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buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
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for (; (buf = *bufs); bufs++) {
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for (i = 0; i < start; i++)
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buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
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for ( ; i < start + len; i++)
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buf[i] = PATTERN_SRC | PATTERN_COPY
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| (~i & PATTERN_COUNT_MASK);;
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for ( ; i < test_buf_size; i++)
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buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
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buf++;
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}
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}
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static void dmatest_init_dstbuf(u8 *buf, unsigned int start, unsigned int len)
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static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
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{
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unsigned int i;
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u8 *buf;
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for (i = 0; i < start; i++)
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buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
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for ( ; i < start + len; i++)
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buf[i] = PATTERN_DST | PATTERN_OVERWRITE
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| (~i & PATTERN_COUNT_MASK);
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for ( ; i < test_buf_size; i++)
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buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
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for (; (buf = *bufs); bufs++) {
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for (i = 0; i < start; i++)
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buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
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for ( ; i < start + len; i++)
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buf[i] = PATTERN_DST | PATTERN_OVERWRITE
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| (~i & PATTERN_COUNT_MASK);
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for ( ; i < test_buf_size; i++)
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buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
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}
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}
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static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
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@ -150,23 +163,30 @@ static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
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thread_name, index, expected, actual);
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}
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static unsigned int dmatest_verify(u8 *buf, unsigned int start,
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static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
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unsigned int end, unsigned int counter, u8 pattern,
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bool is_srcbuf)
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{
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unsigned int i;
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unsigned int error_count = 0;
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u8 actual;
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u8 expected;
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u8 *buf;
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unsigned int counter_orig = counter;
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for (i = start; i < end; i++) {
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actual = buf[i];
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if (actual != (pattern | (~counter & PATTERN_COUNT_MASK))) {
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if (error_count < 32)
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dmatest_mismatch(actual, pattern, i, counter,
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is_srcbuf);
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error_count++;
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for (; (buf = *bufs); bufs++) {
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counter = counter_orig;
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for (i = start; i < end; i++) {
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actual = buf[i];
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expected = pattern | (~counter & PATTERN_COUNT_MASK);
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if (actual != expected) {
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if (error_count < 32)
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dmatest_mismatch(actual, pattern, i,
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counter, is_srcbuf);
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error_count++;
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}
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counter++;
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}
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counter++;
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}
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if (error_count > 32)
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@ -178,10 +198,10 @@ static unsigned int dmatest_verify(u8 *buf, unsigned int start,
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/*
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* This function repeatedly tests DMA transfers of various lengths and
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* offsets until it is told to exit by kthread_stop(). There may be
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* multiple threads running this function in parallel for a single
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* channel, and there may be multiple channels being tested in
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* parallel.
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* offsets for a given operation type until it is told to exit by
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* kthread_stop(). There may be multiple threads running this function
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* in parallel for a single channel, and there may be multiple channels
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* being tested in parallel.
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*
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* Before each test, the source and destination buffer is initialized
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* with a known pattern. This pattern is different depending on
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@ -201,25 +221,53 @@ static int dmatest_func(void *data)
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unsigned int total_tests = 0;
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dma_cookie_t cookie;
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enum dma_status status;
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enum dma_ctrl_flags flags;
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int ret;
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int src_cnt;
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int dst_cnt;
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int i;
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thread_name = current->comm;
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ret = -ENOMEM;
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thread->srcbuf = kmalloc(test_buf_size, GFP_KERNEL);
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if (!thread->srcbuf)
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goto err_srcbuf;
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thread->dstbuf = kmalloc(test_buf_size, GFP_KERNEL);
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if (!thread->dstbuf)
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goto err_dstbuf;
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smp_rmb();
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chan = thread->chan;
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if (thread->type == DMA_MEMCPY)
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src_cnt = dst_cnt = 1;
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else if (thread->type == DMA_XOR) {
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src_cnt = xor_sources | 1; /* force odd to ensure dst = src */
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dst_cnt = 1;
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} else
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goto err_srcs;
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thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
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if (!thread->srcs)
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goto err_srcs;
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for (i = 0; i < src_cnt; i++) {
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thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL);
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if (!thread->srcs[i])
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goto err_srcbuf;
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}
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thread->srcs[i] = NULL;
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thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL);
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if (!thread->dsts)
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goto err_dsts;
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for (i = 0; i < dst_cnt; i++) {
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thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL);
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if (!thread->dsts[i])
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goto err_dstbuf;
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}
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thread->dsts[i] = NULL;
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flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP;
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while (!kthread_should_stop()) {
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struct dma_device *dev = chan->device;
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struct dma_async_tx_descriptor *tx;
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dma_addr_t dma_src, dma_dest;
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struct dma_async_tx_descriptor *tx = NULL;
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dma_addr_t dma_srcs[src_cnt];
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dma_addr_t dma_dsts[dst_cnt];
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total_tests++;
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@ -227,22 +275,41 @@ static int dmatest_func(void *data)
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src_off = dmatest_random() % (test_buf_size - len + 1);
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dst_off = dmatest_random() % (test_buf_size - len + 1);
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dmatest_init_srcbuf(thread->srcbuf, src_off, len);
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dmatest_init_dstbuf(thread->dstbuf, dst_off, len);
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dmatest_init_srcs(thread->srcs, src_off, len);
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dmatest_init_dsts(thread->dsts, dst_off, len);
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dma_src = dma_map_single(dev->dev, thread->srcbuf + src_off,
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len, DMA_TO_DEVICE);
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for (i = 0; i < src_cnt; i++) {
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u8 *buf = thread->srcs[i] + src_off;
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dma_srcs[i] = dma_map_single(dev->dev, buf, len,
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DMA_TO_DEVICE);
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}
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/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
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dma_dest = dma_map_single(dev->dev, thread->dstbuf,
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test_buf_size, DMA_BIDIRECTIONAL);
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for (i = 0; i < dst_cnt; i++) {
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dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
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test_buf_size,
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DMA_BIDIRECTIONAL);
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}
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if (thread->type == DMA_MEMCPY)
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tx = dev->device_prep_dma_memcpy(chan,
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dma_dsts[0] + dst_off,
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dma_srcs[0], len,
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flags);
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else if (thread->type == DMA_XOR)
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tx = dev->device_prep_dma_xor(chan,
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dma_dsts[0] + dst_off,
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dma_srcs, xor_sources,
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len, flags);
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tx = dev->device_prep_dma_memcpy(chan, dma_dest + dst_off,
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dma_src, len,
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DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP);
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if (!tx) {
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dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
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dma_unmap_single(dev->dev, dma_dest,
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test_buf_size, DMA_BIDIRECTIONAL);
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for (i = 0; i < src_cnt; i++)
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dma_unmap_single(dev->dev, dma_srcs[i], len,
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DMA_TO_DEVICE);
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for (i = 0; i < dst_cnt; i++)
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dma_unmap_single(dev->dev, dma_dsts[i],
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test_buf_size,
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DMA_BIDIRECTIONAL);
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pr_warning("%s: #%u: prep error with src_off=0x%x "
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"dst_off=0x%x len=0x%x\n",
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thread_name, total_tests - 1,
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@ -263,11 +330,11 @@ static int dmatest_func(void *data)
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failed_tests++;
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continue;
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}
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dma_async_memcpy_issue_pending(chan);
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dma_async_issue_pending(chan);
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do {
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msleep(1);
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status = dma_async_memcpy_complete(
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status = dma_async_is_tx_complete(
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chan, cookie, NULL, NULL);
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} while (status == DMA_IN_PROGRESS);
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@ -278,29 +345,30 @@ static int dmatest_func(void *data)
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continue;
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}
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/* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
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dma_unmap_single(dev->dev, dma_dest,
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test_buf_size, DMA_BIDIRECTIONAL);
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for (i = 0; i < dst_cnt; i++)
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dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
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DMA_BIDIRECTIONAL);
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error_count = 0;
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pr_debug("%s: verifying source buffer...\n", thread_name);
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error_count += dmatest_verify(thread->srcbuf, 0, src_off,
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error_count += dmatest_verify(thread->srcs, 0, src_off,
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0, PATTERN_SRC, true);
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error_count += dmatest_verify(thread->srcbuf, src_off,
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error_count += dmatest_verify(thread->srcs, src_off,
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src_off + len, src_off,
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PATTERN_SRC | PATTERN_COPY, true);
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error_count += dmatest_verify(thread->srcbuf, src_off + len,
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error_count += dmatest_verify(thread->srcs, src_off + len,
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test_buf_size, src_off + len,
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PATTERN_SRC, true);
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pr_debug("%s: verifying dest buffer...\n",
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thread->task->comm);
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error_count += dmatest_verify(thread->dstbuf, 0, dst_off,
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error_count += dmatest_verify(thread->dsts, 0, dst_off,
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0, PATTERN_DST, false);
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error_count += dmatest_verify(thread->dstbuf, dst_off,
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error_count += dmatest_verify(thread->dsts, dst_off,
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dst_off + len, src_off,
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PATTERN_SRC | PATTERN_COPY, false);
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error_count += dmatest_verify(thread->dstbuf, dst_off + len,
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error_count += dmatest_verify(thread->dsts, dst_off + len,
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test_buf_size, dst_off + len,
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PATTERN_DST, false);
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@ -319,10 +387,16 @@ static int dmatest_func(void *data)
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}
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ret = 0;
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kfree(thread->dstbuf);
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for (i = 0; thread->dsts[i]; i++)
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kfree(thread->dsts[i]);
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err_dstbuf:
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kfree(thread->srcbuf);
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kfree(thread->dsts);
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err_dsts:
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for (i = 0; thread->srcs[i]; i++)
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kfree(thread->srcs[i]);
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err_srcbuf:
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kfree(thread->srcs);
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err_srcs:
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pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
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thread_name, total_tests, failed_tests, ret);
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return ret;
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@ -344,11 +418,54 @@ static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
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kfree(dtc);
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}
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static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
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{
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struct dmatest_thread *thread;
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struct dma_chan *chan = dtc->chan;
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char *op;
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unsigned int i;
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if (type == DMA_MEMCPY)
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op = "copy";
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else if (type == DMA_XOR)
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op = "xor";
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else
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return -EINVAL;
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for (i = 0; i < threads_per_chan; i++) {
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thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
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if (!thread) {
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pr_warning("dmatest: No memory for %s-%s%u\n",
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dma_chan_name(chan), op, i);
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break;
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}
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thread->chan = dtc->chan;
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thread->type = type;
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smp_wmb();
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thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
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dma_chan_name(chan), op, i);
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if (IS_ERR(thread->task)) {
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pr_warning("dmatest: Failed to run thread %s-%s%u\n",
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dma_chan_name(chan), op, i);
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kfree(thread);
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break;
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}
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/* srcbuf and dstbuf are allocated by the thread itself */
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list_add_tail(&thread->node, &dtc->threads);
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}
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return i;
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}
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static int dmatest_add_channel(struct dma_chan *chan)
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{
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struct dmatest_chan *dtc;
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struct dmatest_thread *thread;
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unsigned int i;
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struct dma_device *dma_dev = chan->device;
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unsigned int thread_count = 0;
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unsigned int cnt;
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dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
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if (!dtc) {
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@ -359,30 +476,17 @@ static int dmatest_add_channel(struct dma_chan *chan)
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dtc->chan = chan;
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INIT_LIST_HEAD(&dtc->threads);
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for (i = 0; i < threads_per_chan; i++) {
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thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
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if (!thread) {
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pr_warning("dmatest: No memory for %s-test%u\n",
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dma_chan_name(chan), i);
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break;
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}
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thread->chan = dtc->chan;
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smp_wmb();
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thread->task = kthread_run(dmatest_func, thread, "%s-test%u",
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dma_chan_name(chan), i);
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if (IS_ERR(thread->task)) {
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pr_warning("dmatest: Failed to run thread %s-test%u\n",
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dma_chan_name(chan), i);
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kfree(thread);
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break;
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}
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/* srcbuf and dstbuf are allocated by the thread itself */
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list_add_tail(&thread->node, &dtc->threads);
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if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
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cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
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thread_count += cnt > 0 ?: 0;
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}
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if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
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cnt = dmatest_add_threads(dtc, DMA_XOR);
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thread_count += cnt > 0 ?: 0;
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}
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pr_info("dmatest: Started %u threads using %s\n", i, dma_chan_name(chan));
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pr_info("dmatest: Started %u threads using %s\n",
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thread_count, dma_chan_name(chan));
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list_add_tail(&dtc->node, &dmatest_channels);
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nr_channels++;
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