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>

1 files changed, 189 insertions, 85 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index e190d8b30700..224acf478fec 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++;