--- /dev/null
+/*
+ * XILINX CDMA Engine test module
+ *
+ * Copyright (C) 2012 Xilinx, Inc. All rights reserved.
+ *
+ * Based on Atmel DMA Test Client
+ *
+ * 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/random.h>
+#include <linux/slab.h>
+#include <linux/of_dma.h>
+#include <linux/platform_device.h>
+#include <linux/wait.h>
+#include <linux/sched/task.h>
+#include <linux/dma/xilinx_dma.h>
+
+static unsigned int test_buf_size = 64;
+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 iterations = 5;
+module_param(iterations, uint, S_IRUGO);
+MODULE_PARM_DESC(iterations,
+ "Iterations before stopping test (default: infinite)");
+
+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)");
+
+static unsigned int pq_sources = 3;
+module_param(pq_sources, uint, S_IRUGO);
+MODULE_PARM_DESC(pq_sources,
+ "Number of p+q 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 cdmatest_thread {
+ struct list_head node;
+ struct task_struct *task;
+ struct dma_chan *chan;
+ u8 **srcs;
+ u8 **dsts;
+ enum dma_transaction_type type;
+ bool done;
+};
+
+struct cdmatest_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 DECLARE_WAIT_QUEUE_HEAD(thread_wait);
+static LIST_HEAD(cdmatest_channels);
+static unsigned int nr_channels;
+
+static bool is_threaded_test_run(struct cdmatest_chan *tx_dtc)
+{
+ struct cdmatest_thread *thread;
+
+ list_for_each_entry(thread, &tx_dtc->threads, node) {
+ if (!thread->done)
+ return true;
+ }
+
+ return false;
+}
+
+static unsigned long cdmatest_random(void)
+{
+ unsigned long buf;
+
+ get_random_bytes(&buf, sizeof(buf));
+ return buf;
+}
+
+static void cdmatest_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 cdmatest_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 cdmatest_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_warn(
+ "%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_warn(
+ "%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
+ thread_name, index, expected, actual);
+ else if (diff & PATTERN_SRC)
+ pr_warn(
+ "%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
+ thread_name, index, expected, actual);
+ else
+ pr_warn(
+ "%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
+ thread_name, index, expected, actual);
+}
+
+static unsigned int cdmatest_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)
+ cdmatest_mismatch(actual, pattern, i,
+ counter, is_srcbuf);
+ error_count++;
+ }
+ counter++;
+ }
+ }
+
+ if (error_count > 32)
+ pr_warn("%s: %u errors suppressed\n",
+ current->comm, error_count - 32);
+
+ return error_count;
+}
+
+static void cdmatest_callback(void *completion)
+{
+ complete(completion);
+}
+
+/*
+ * 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 cdmatest_func(void *data)
+{
+ struct cdmatest_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;
+ u8 pq_coefs[pq_sources + 1];
+ int ret;
+ int src_cnt;
+ int dst_cnt;
+ int i;
+
+ thread_name = current->comm;
+
+ ret = -ENOMEM;
+
+ /* JZ: limit testing scope here */
+
+ 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 if (thread->type == DMA_PQ) {
+ src_cnt = pq_sources | 1;
+ /* force odd to ensure dst = src */
+ dst_cnt = 2;
+ for (i = 0; i < src_cnt; i++)
+ pq_coefs[i] = 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;
+
+ set_user_nice(current, 10);
+
+ flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
+
+ while (!kthread_should_stop()
+ && !(iterations && total_tests >= iterations)) {
+ 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];
+ struct completion cmp;
+ unsigned long tmo = msecs_to_jiffies(3000);
+ u8 align = 0;
+
+ total_tests++;
+
+ /* honor alignment restrictions */
+ if (thread->type == DMA_MEMCPY)
+ align = dev->copy_align;
+ else if (thread->type == DMA_XOR)
+ align = dev->xor_align;
+ else if (thread->type == DMA_PQ)
+ align = dev->pq_align;
+
+ if (1 << align > test_buf_size) {
+ pr_err("%u-byte buffer too small for %d-byte alignment\n",
+ test_buf_size, 1 << align);
+ break;
+ }
+
+ len = cdmatest_random() % test_buf_size + 1;
+ len = (len >> align) << align;
+ if (!len)
+ len = 1 << align;
+ src_off = cdmatest_random() % (test_buf_size - len + 1);
+ dst_off = cdmatest_random() % (test_buf_size - len + 1);
+
+ src_off = (src_off >> align) << align;
+ dst_off = (dst_off >> align) << align;
+
+ cdmatest_init_srcs(thread->srcs, src_off, len);
+ cdmatest_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_MEM_TO_DEV);
+ }
+ /* map with DMA_MEM_TO_MEM 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_MEM_TO_MEM);
+ }
+
+ 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, src_cnt,
+ len, flags);
+ else if (thread->type == DMA_PQ) {
+ dma_addr_t dma_pq[dst_cnt];
+
+ for (i = 0; i < dst_cnt; i++)
+ dma_pq[i] = dma_dsts[i] + dst_off;
+ tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
+ src_cnt, pq_coefs,
+ len, flags);
+ }
+
+ if (!tx) {
+ for (i = 0; i < src_cnt; i++)
+ dma_unmap_single(dev->dev, dma_srcs[i], len,
+ DMA_MEM_TO_DEV);
+ for (i = 0; i < dst_cnt; i++)
+ dma_unmap_single(dev->dev, dma_dsts[i],
+ test_buf_size,
+ DMA_MEM_TO_MEM);
+ pr_warn(
+ "%s: #%u: prep error with src_off=0x%x ",
+ thread_name, total_tests - 1, src_off);
+ pr_warn("dst_off=0x%x len=0x%x\n",
+ dst_off, len);
+ msleep(100);
+ failed_tests++;
+ continue;
+ }
+
+ init_completion(&cmp);
+ tx->callback = cdmatest_callback;
+ tx->callback_param = &cmp;
+ cookie = tx->tx_submit(tx);
+
+ if (dma_submit_error(cookie)) {
+ pr_warn(
+ "%s: #%u: submit error %d with src_off=0x%x ",
+ thread_name, total_tests - 1,
+ cookie, src_off);
+ pr_warn("dst_off=0x%x len=0x%x\n",
+ dst_off, len);
+ msleep(100);
+ failed_tests++;
+ continue;
+ }
+ dma_async_issue_pending(chan);
+
+ tmo = wait_for_completion_timeout(&cmp, tmo);
+ status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
+
+ if (tmo == 0) {
+ pr_warn("%s: #%u: test timed out\n",
+ thread_name, total_tests - 1);
+ failed_tests++;
+ continue;
+ } else if (status != DMA_COMPLETE) {
+ pr_warn(
+ "%s: #%u: got completion callback, ",
+ thread_name, total_tests - 1);
+ pr_warn("but status is \'%s\'\n",
+ status == DMA_ERROR ? "error" :
+ "in progress");
+ failed_tests++;
+ continue;
+ }
+
+ /* Unmap by myself */
+ for (i = 0; i < dst_cnt; i++)
+ dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
+ DMA_MEM_TO_MEM);
+
+ error_count = 0;
+
+ pr_debug("%s: verifying source buffer...\n", thread_name);
+ error_count += cdmatest_verify(thread->srcs, 0, src_off,
+ 0, PATTERN_SRC, true);
+ error_count += cdmatest_verify(thread->srcs, src_off,
+ src_off + len, src_off,
+ PATTERN_SRC | PATTERN_COPY, true);
+ error_count += cdmatest_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 += cdmatest_verify(thread->dsts, 0, dst_off,
+ 0, PATTERN_DST, false);
+ error_count += cdmatest_verify(thread->dsts, dst_off,
+ dst_off + len, src_off,
+ PATTERN_SRC | PATTERN_COPY, false);
+ error_count += cdmatest_verify(thread->dsts, dst_off + len,
+ test_buf_size, dst_off + len,
+ PATTERN_DST, false);
+
+ if (error_count) {
+ pr_warn("%s: #%u: %u errors with ",
+ thread_name, total_tests - 1, error_count);
+ pr_warn("src_off=0x%x dst_off=0x%x len=0x%x\n",
+ src_off, dst_off, len);
+ failed_tests++;
+ } else {
+ pr_debug("%s: #%u: No errors with ",
+ thread_name, total_tests - 1);
+ pr_debug("src_off=0x%x dst_off=0x%x len=0x%x\n",
+ 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);
+
+ thread->done = true;
+ wake_up(&thread_wait);
+
+ return ret;
+}
+
+static void cdmatest_cleanup_channel(struct cdmatest_chan *dtc)
+{
+ struct cdmatest_thread *thread;
+ struct cdmatest_thread *_thread;
+ int ret;
+
+ list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
+ ret = kthread_stop(thread->task);
+ pr_debug("cdmatest: thread %s exited with status %d\n",
+ thread->task->comm, ret);
+ list_del(&thread->node);
+ put_task_struct(thread->task);
+ kfree(thread);
+ }
+ kfree(dtc);
+}
+
+static int cdmatest_add_threads(struct cdmatest_chan *dtc,
+ enum dma_transaction_type type)
+{
+ struct cdmatest_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 if (type == DMA_PQ)
+ op = "pq";
+ else
+ return -EINVAL;
+
+ for (i = 0; i < threads_per_chan; i++) {
+ thread = kzalloc(sizeof(struct cdmatest_thread), GFP_KERNEL);
+ if (!thread) {
+ pr_warn("cdmatest: 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(cdmatest_func, thread, "%s-%s%u",
+ dma_chan_name(chan), op, i);
+ if (IS_ERR(thread->task)) {
+ pr_warn("cdmatest: 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 */
+ get_task_struct(thread->task);
+ list_add_tail(&thread->node, &dtc->threads);
+ }
+
+ return i;
+}
+
+static int cdmatest_add_channel(struct dma_chan *chan)
+{
+ struct cdmatest_chan *dtc;
+ struct dma_device *dma_dev = chan->device;
+ unsigned int thread_count = 0;
+ int cnt;
+
+ dtc = kmalloc(sizeof(struct cdmatest_chan), GFP_KERNEL);
+ if (!dtc) {
+ pr_warn("cdmatest: 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 = cdmatest_add_threads(dtc, DMA_MEMCPY);
+ thread_count += cnt > 0 ? cnt : 0;
+ }
+ if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
+ cnt = cdmatest_add_threads(dtc, DMA_XOR);
+ thread_count += cnt > 0 ? cnt : 0;
+ }
+ if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
+ cnt = cdmatest_add_threads(dtc, DMA_PQ);
+ thread_count += cnt > 0 ? cnt : 0;
+ }
+
+ pr_info("cdmatest: Started %u threads using %s\n",
+ thread_count, dma_chan_name(chan));
+
+ list_add_tail(&dtc->node, &cdmatest_channels);
+ nr_channels++;
+
+ if (iterations)
+ wait_event(thread_wait, !is_threaded_test_run(dtc));
+
+ return 0;
+}
+
+static int xilinx_cdmatest_probe(struct platform_device *pdev)
+{
+ struct dma_chan *chan;
+ int err;
+
+ chan = dma_request_slave_channel(&pdev->dev, "cdma");
+ if (IS_ERR(chan)) {
+ pr_err("xilinx_cdmatest: No channel\n");
+ return PTR_ERR(chan);
+ }
+
+ err = cdmatest_add_channel(chan);
+ if (err) {
+ pr_err("xilinx_cdmatest: Unable to add channel\n");
+ goto free_tx;
+ }
+ return 0;
+
+free_tx:
+ dma_release_channel(chan);
+
+ return err;
+}
+
+static int xilinx_cdmatest_remove(struct platform_device *pdev)
+{
+ struct cdmatest_chan *dtc, *_dtc;
+ struct dma_chan *chan;
+
+ list_for_each_entry_safe(dtc, _dtc, &cdmatest_channels, node) {
+ list_del(&dtc->node);
+ chan = dtc->chan;
+ cdmatest_cleanup_channel(dtc);
+ pr_info("xilinx_cdmatest: dropped channel %s\n",
+ dma_chan_name(chan));
+ dma_release_channel(chan);
+ }
+ return 0;
+}
+
+static const struct of_device_id xilinx_cdmatest_of_ids[] = {
+ { .compatible = "xlnx,axi-cdma-test-1.00.a", },
+ {}
+};
+
+static struct platform_driver xilinx_cdmatest_driver = {
+ .driver = {
+ .name = "xilinx_cdmatest",
+ .owner = THIS_MODULE,
+ .of_match_table = xilinx_cdmatest_of_ids,
+ },
+ .probe = xilinx_cdmatest_probe,
+ .remove = xilinx_cdmatest_remove,
+};
+
+static int __init cdma_init(void)
+{
+ return platform_driver_register(&xilinx_cdmatest_driver);
+
+}
+late_initcall(cdma_init);
+
+static void __exit cdma_exit(void)
+{
+ platform_driver_unregister(&xilinx_cdmatest_driver);
+}
+module_exit(cdma_exit)
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("Xilinx AXI CDMA Test Client");
+MODULE_LICENSE("GPL v2");
projects / zynq / linux.git / commitdiff