diff options
Diffstat (limited to 'drivers/dma/dmatest.c')
| -rw-r--r-- | drivers/dma/dmatest.c | 987 |
1 files changed, 987 insertions, 0 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c new file mode 100644 index 000000000..220ee4963 --- /dev/null +++ b/drivers/dma/dmatest.c @@ -0,0 +1,987 @@ +/* + * DMA Engine test module + * + * Copyright (C) 2007 Atmel Corporation + * Copyright (C) 2013 Intel 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. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/freezer.h> +#include <linux/init.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/random.h> +#include <linux/slab.h> +#include <linux/wait.h> + +static unsigned int test_buf_size = 16384; +module_param(test_buf_size, uint, S_IRUGO | S_IWUSR); +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 | S_IWUSR); +MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)"); + +static char test_device[32]; +module_param_string(device, test_device, sizeof(test_device), + S_IRUGO | S_IWUSR); +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 | S_IWUSR); +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 | S_IWUSR); +MODULE_PARM_DESC(max_channels, + "Maximum number of channels to use (default: all)"); + +static unsigned int iterations; +module_param(iterations, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(iterations, + "Iterations before stopping test (default: infinite)"); + +static unsigned int xor_sources = 3; +module_param(xor_sources, uint, S_IRUGO | S_IWUSR); +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 | S_IWUSR); +MODULE_PARM_DESC(pq_sources, + "Number of p+q source buffers (default: 3)"); + +static int timeout = 3000; +module_param(timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), " + "Pass -1 for infinite timeout"); + +static bool noverify; +module_param(noverify, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(noverify, "Disable random data setup and verification"); + +static bool verbose; +module_param(verbose, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)"); + +/** + * struct dmatest_params - test parameters. + * @buf_size: size of the memcpy test buffer + * @channel: bus ID of the channel to test + * @device: bus ID of the DMA Engine to test + * @threads_per_chan: number of threads to start per channel + * @max_channels: maximum number of channels to use + * @iterations: iterations before stopping test + * @xor_sources: number of xor source buffers + * @pq_sources: number of p+q source buffers + * @timeout: transfer timeout in msec, -1 for infinite timeout + */ +struct dmatest_params { + unsigned int buf_size; + char channel[20]; + char device[32]; + unsigned int threads_per_chan; + unsigned int max_channels; + unsigned int iterations; + unsigned int xor_sources; + unsigned int pq_sources; + int timeout; + bool noverify; +}; + +/** + * struct dmatest_info - test information. + * @params: test parameters + * @lock: access protection to the fields of this structure + */ +static struct dmatest_info { + /* Test parameters */ + struct dmatest_params params; + + /* Internal state */ + struct list_head channels; + unsigned int nr_channels; + struct mutex lock; + bool did_init; +} test_info = { + .channels = LIST_HEAD_INIT(test_info.channels), + .lock = __MUTEX_INITIALIZER(test_info.lock), +}; + +static int dmatest_run_set(const char *val, const struct kernel_param *kp); +static int dmatest_run_get(char *val, const struct kernel_param *kp); +static struct kernel_param_ops run_ops = { + .set = dmatest_run_set, + .get = dmatest_run_get, +}; +static bool dmatest_run; +module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(run, "Run the test (default: false)"); + +/* Maximum amount of mismatched bytes in buffer to print */ +#define MAX_ERROR_COUNT 32 + +/* + * 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 dmatest_info *info; + struct task_struct *task; + struct dma_chan *chan; + u8 **srcs; + u8 **dsts; + enum dma_transaction_type type; + bool done; +}; + +struct dmatest_chan { + struct list_head node; + struct dma_chan *chan; + struct list_head threads; +}; + +static DECLARE_WAIT_QUEUE_HEAD(thread_wait); +static bool wait; + +static bool is_threaded_test_run(struct dmatest_info *info) +{ + struct dmatest_chan *dtc; + + list_for_each_entry(dtc, &info->channels, node) { + struct dmatest_thread *thread; + + list_for_each_entry(thread, &dtc->threads, node) { + if (!thread->done) + return true; + } + } + + return false; +} + +static int dmatest_wait_get(char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + struct dmatest_params *params = &info->params; + + if (params->iterations) + wait_event(thread_wait, !is_threaded_test_run(info)); + wait = true; + return param_get_bool(val, kp); +} + +static struct kernel_param_ops wait_ops = { + .get = dmatest_wait_get, + .set = param_set_bool, +}; +module_param_cb(wait, &wait_ops, &wait, S_IRUGO); +MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)"); + +static bool dmatest_match_channel(struct dmatest_params *params, + struct dma_chan *chan) +{ + if (params->channel[0] == '\0') + return true; + return strcmp(dma_chan_name(chan), params->channel) == 0; +} + +static bool dmatest_match_device(struct dmatest_params *params, + struct dma_device *device) +{ + if (params->device[0] == '\0') + return true; + return strcmp(dev_name(device->dev), params->device) == 0; +} + +static unsigned long dmatest_random(void) +{ + unsigned long buf; + + prandom_bytes(&buf, sizeof(buf)); + return buf; +} + +static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len, + unsigned int buf_size) +{ + 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 < 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 buf_size) +{ + 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 < 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_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 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 < MAX_ERROR_COUNT) + dmatest_mismatch(actual, pattern, i, + counter, is_srcbuf); + error_count++; + } + counter++; + } + } + + if (error_count > MAX_ERROR_COUNT) + pr_warn("%s: %u errors suppressed\n", + current->comm, error_count - MAX_ERROR_COUNT); + + return error_count; +} + +/* poor man's completion - we want to use wait_event_freezable() on it */ +struct dmatest_done { + bool done; + wait_queue_head_t *wait; +}; + +static void dmatest_callback(void *arg) +{ + struct dmatest_done *done = arg; + + done->done = true; + wake_up_all(done->wait); +} + +static unsigned int min_odd(unsigned int x, unsigned int y) +{ + unsigned int val = min(x, y); + + return val % 2 ? val : val - 1; +} + +static void result(const char *err, unsigned int n, unsigned int src_off, + unsigned int dst_off, unsigned int len, unsigned long data) +{ + pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n", + current->comm, n, err, src_off, dst_off, len, data); +} + +static void dbg_result(const char *err, unsigned int n, unsigned int src_off, + unsigned int dst_off, unsigned int len, + unsigned long data) +{ + pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n", + current->comm, n, err, src_off, dst_off, len, data); +} + +#define verbose_result(err, n, src_off, dst_off, len, data) ({ \ + if (verbose) \ + result(err, n, src_off, dst_off, len, data); \ + else \ + dbg_result(err, n, src_off, dst_off, len, data);\ +}) + +static unsigned long long dmatest_persec(s64 runtime, unsigned int val) +{ + unsigned long long per_sec = 1000000; + + if (runtime <= 0) + return 0; + + /* drop precision until runtime is 32-bits */ + while (runtime > UINT_MAX) { + runtime >>= 1; + per_sec <<= 1; + } + + per_sec *= val; + do_div(per_sec, runtime); + return per_sec; +} + +static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len) +{ + return dmatest_persec(runtime, len >> 10); +} + +/* + * 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) +{ + DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait); + struct dmatest_thread *thread = data; + struct dmatest_done done = { .wait = &done_wait }; + struct dmatest_info *info; + struct dmatest_params *params; + struct dma_chan *chan; + struct dma_device *dev; + 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 = NULL; + int ret; + int src_cnt; + int dst_cnt; + int i; + ktime_t ktime; + s64 runtime = 0; + unsigned long long total_len = 0; + + set_freezable(); + + ret = -ENOMEM; + + smp_rmb(); + info = thread->info; + params = &info->params; + chan = thread->chan; + dev = chan->device; + if (thread->type == DMA_MEMCPY) + src_cnt = dst_cnt = 1; + else if (thread->type == DMA_XOR) { + /* force odd to ensure dst = src */ + src_cnt = min_odd(params->xor_sources | 1, dev->max_xor); + dst_cnt = 1; + } else if (thread->type == DMA_PQ) { + /* force odd to ensure dst = src */ + src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0)); + dst_cnt = 2; + + pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL); + if (!pq_coefs) + goto err_thread_type; + + for (i = 0; i < src_cnt; i++) + pq_coefs[i] = 1; + } else + goto err_thread_type; + + 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(params->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(params->buf_size, GFP_KERNEL); + if (!thread->dsts[i]) + goto err_dstbuf; + } + thread->dsts[i] = NULL; + + set_user_nice(current, 10); + + /* + * src and dst buffers are freed by ourselves below + */ + flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; + + ktime = ktime_get(); + while (!kthread_should_stop() + && !(params->iterations && total_tests >= params->iterations)) { + struct dma_async_tx_descriptor *tx = NULL; + struct dmaengine_unmap_data *um; + dma_addr_t srcs[src_cnt]; + dma_addr_t *dsts; + unsigned int src_off, dst_off, len; + 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 > params->buf_size) { + pr_err("%u-byte buffer too small for %d-byte alignment\n", + params->buf_size, 1 << align); + break; + } + + if (params->noverify) + len = params->buf_size; + else + len = dmatest_random() % params->buf_size + 1; + + len = (len >> align) << align; + if (!len) + len = 1 << align; + + total_len += len; + + if (params->noverify) { + src_off = 0; + dst_off = 0; + } else { + src_off = dmatest_random() % (params->buf_size - len + 1); + dst_off = dmatest_random() % (params->buf_size - len + 1); + + src_off = (src_off >> align) << align; + dst_off = (dst_off >> align) << align; + + dmatest_init_srcs(thread->srcs, src_off, len, + params->buf_size); + dmatest_init_dsts(thread->dsts, dst_off, len, + params->buf_size); + } + + um = dmaengine_get_unmap_data(dev->dev, src_cnt+dst_cnt, + GFP_KERNEL); + if (!um) { + failed_tests++; + result("unmap data NULL", total_tests, + src_off, dst_off, len, ret); + continue; + } + + um->len = params->buf_size; + for (i = 0; i < src_cnt; i++) { + void *buf = thread->srcs[i]; + struct page *pg = virt_to_page(buf); + unsigned pg_off = (unsigned long) buf & ~PAGE_MASK; + + um->addr[i] = dma_map_page(dev->dev, pg, pg_off, + um->len, DMA_TO_DEVICE); + srcs[i] = um->addr[i] + src_off; + ret = dma_mapping_error(dev->dev, um->addr[i]); + if (ret) { + dmaengine_unmap_put(um); + result("src mapping error", total_tests, + src_off, dst_off, len, ret); + failed_tests++; + continue; + } + um->to_cnt++; + } + /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */ + dsts = &um->addr[src_cnt]; + for (i = 0; i < dst_cnt; i++) { + void *buf = thread->dsts[i]; + struct page *pg = virt_to_page(buf); + unsigned pg_off = (unsigned long) buf & ~PAGE_MASK; + + dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len, + DMA_BIDIRECTIONAL); + ret = dma_mapping_error(dev->dev, dsts[i]); + if (ret) { + dmaengine_unmap_put(um); + result("dst mapping error", total_tests, + src_off, dst_off, len, ret); + failed_tests++; + continue; + } + um->bidi_cnt++; + } + + if (thread->type == DMA_MEMCPY) + tx = dev->device_prep_dma_memcpy(chan, + dsts[0] + dst_off, + srcs[0], len, flags); + else if (thread->type == DMA_XOR) + tx = dev->device_prep_dma_xor(chan, + dsts[0] + dst_off, + 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] = dsts[i] + dst_off; + tx = dev->device_prep_dma_pq(chan, dma_pq, srcs, + src_cnt, pq_coefs, + len, flags); + } + + if (!tx) { + dmaengine_unmap_put(um); + result("prep error", total_tests, src_off, + dst_off, len, ret); + msleep(100); + failed_tests++; + continue; + } + + done.done = false; + tx->callback = dmatest_callback; + tx->callback_param = &done; + cookie = tx->tx_submit(tx); + + if (dma_submit_error(cookie)) { + dmaengine_unmap_put(um); + result("submit error", total_tests, src_off, + dst_off, len, ret); + msleep(100); + failed_tests++; + continue; + } + dma_async_issue_pending(chan); + + wait_event_freezable_timeout(done_wait, done.done, + msecs_to_jiffies(params->timeout)); + + status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); + + if (!done.done) { + /* + * We're leaving the timed out dma operation with + * dangling pointer to done_wait. To make this + * correct, we'll need to allocate wait_done for + * each test iteration and perform "who's gonna + * free it this time?" dancing. For now, just + * leave it dangling. + */ + dmaengine_unmap_put(um); + result("test timed out", total_tests, src_off, dst_off, + len, 0); + failed_tests++; + continue; + } else if (status != DMA_COMPLETE) { + dmaengine_unmap_put(um); + result(status == DMA_ERROR ? + "completion error status" : + "completion busy status", total_tests, src_off, + dst_off, len, ret); + failed_tests++; + continue; + } + + dmaengine_unmap_put(um); + + if (params->noverify) { + verbose_result("test passed", total_tests, src_off, + dst_off, len, 0); + continue; + } + + pr_debug("%s: verifying source buffer...\n", current->comm); + 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, + params->buf_size, src_off + len, + PATTERN_SRC, true); + + pr_debug("%s: verifying dest buffer...\n", current->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, + params->buf_size, dst_off + len, + PATTERN_DST, false); + + if (error_count) { + result("data error", total_tests, src_off, dst_off, + len, error_count); + failed_tests++; + } else { + verbose_result("test passed", total_tests, src_off, + dst_off, len, 0); + } + } + runtime = ktime_us_delta(ktime_get(), ktime); + + ret = 0; +err_dstbuf: + for (i = 0; thread->dsts[i]; i++) + kfree(thread->dsts[i]); + kfree(thread->dsts); +err_dsts: +err_srcbuf: + for (i = 0; thread->srcs[i]; i++) + kfree(thread->srcs[i]); + kfree(thread->srcs); +err_srcs: + kfree(pq_coefs); +err_thread_type: + pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n", + current->comm, total_tests, failed_tests, + dmatest_persec(runtime, total_tests), + dmatest_KBs(runtime, total_len), ret); + + /* terminate all transfers on specified channels */ + if (ret) + dmaengine_terminate_all(chan); + + thread->done = true; + wake_up(&thread_wait); + + 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("thread %s exited with status %d\n", + thread->task->comm, ret); + list_del(&thread->node); + put_task_struct(thread->task); + kfree(thread); + } + + /* terminate all transfers on specified channels */ + dmaengine_terminate_all(dtc->chan); + + kfree(dtc); +} + +static int dmatest_add_threads(struct dmatest_info *info, + struct dmatest_chan *dtc, enum dma_transaction_type type) +{ + struct dmatest_params *params = &info->params; + 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 if (type == DMA_PQ) + op = "pq"; + else + return -EINVAL; + + for (i = 0; i < params->threads_per_chan; i++) { + thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL); + if (!thread) { + pr_warn("No memory for %s-%s%u\n", + dma_chan_name(chan), op, i); + break; + } + thread->info = info; + thread->chan = dtc->chan; + thread->type = type; + smp_wmb(); + thread->task = kthread_create(dmatest_func, thread, "%s-%s%u", + dma_chan_name(chan), op, i); + if (IS_ERR(thread->task)) { + pr_warn("Failed to create 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); + wake_up_process(thread->task); + } + + return i; +} + +static int dmatest_add_channel(struct dmatest_info *info, + struct dma_chan *chan) +{ + struct dmatest_chan *dtc; + struct dma_device *dma_dev = chan->device; + unsigned int thread_count = 0; + int cnt; + + dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL); + if (!dtc) { + pr_warn("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(info, dtc, DMA_MEMCPY); + thread_count += cnt > 0 ? cnt : 0; + } + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + cnt = dmatest_add_threads(info, dtc, DMA_XOR); + thread_count += cnt > 0 ? cnt : 0; + } + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { + cnt = dmatest_add_threads(info, dtc, DMA_PQ); + thread_count += cnt > 0 ? cnt : 0; + } + + pr_info("Started %u threads using %s\n", + thread_count, dma_chan_name(chan)); + + list_add_tail(&dtc->node, &info->channels); + info->nr_channels++; + + return 0; +} + +static bool filter(struct dma_chan *chan, void *param) +{ + struct dmatest_params *params = param; + + if (!dmatest_match_channel(params, chan) || + !dmatest_match_device(params, chan->device)) + return false; + else + return true; +} + +static void request_channels(struct dmatest_info *info, + enum dma_transaction_type type) +{ + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(type, mask); + for (;;) { + struct dmatest_params *params = &info->params; + struct dma_chan *chan; + + chan = dma_request_channel(mask, filter, params); + if (chan) { + if (dmatest_add_channel(info, chan)) { + dma_release_channel(chan); + break; /* add_channel failed, punt */ + } + } else + break; /* no more channels available */ + if (params->max_channels && + info->nr_channels >= params->max_channels) + break; /* we have all we need */ + } +} + +static void run_threaded_test(struct dmatest_info *info) +{ + struct dmatest_params *params = &info->params; + + /* Copy test parameters */ + params->buf_size = test_buf_size; + strlcpy(params->channel, strim(test_channel), sizeof(params->channel)); + strlcpy(params->device, strim(test_device), sizeof(params->device)); + params->threads_per_chan = threads_per_chan; + params->max_channels = max_channels; + params->iterations = iterations; + params->xor_sources = xor_sources; + params->pq_sources = pq_sources; + params->timeout = timeout; + params->noverify = noverify; + + request_channels(info, DMA_MEMCPY); + request_channels(info, DMA_XOR); + request_channels(info, DMA_PQ); +} + +static void stop_threaded_test(struct dmatest_info *info) +{ + struct dmatest_chan *dtc, *_dtc; + struct dma_chan *chan; + + list_for_each_entry_safe(dtc, _dtc, &info->channels, node) { + list_del(&dtc->node); + chan = dtc->chan; + dmatest_cleanup_channel(dtc); + pr_debug("dropped channel %s\n", dma_chan_name(chan)); + dma_release_channel(chan); + } + + info->nr_channels = 0; +} + +static void restart_threaded_test(struct dmatest_info *info, bool run) +{ + /* we might be called early to set run=, defer running until all + * parameters have been evaluated + */ + if (!info->did_init) + return; + + /* Stop any running test first */ + stop_threaded_test(info); + + /* Run test with new parameters */ + run_threaded_test(info); +} + +static int dmatest_run_get(char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + + mutex_lock(&info->lock); + if (is_threaded_test_run(info)) { + dmatest_run = true; + } else { + stop_threaded_test(info); + dmatest_run = false; + } + mutex_unlock(&info->lock); + + return param_get_bool(val, kp); +} + +static int dmatest_run_set(const char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + int ret; + + mutex_lock(&info->lock); + ret = param_set_bool(val, kp); + if (ret) { + mutex_unlock(&info->lock); + return ret; + } + + if (is_threaded_test_run(info)) + ret = -EBUSY; + else if (dmatest_run) + restart_threaded_test(info, dmatest_run); + + mutex_unlock(&info->lock); + + return ret; +} + +static int __init dmatest_init(void) +{ + struct dmatest_info *info = &test_info; + struct dmatest_params *params = &info->params; + + if (dmatest_run) { + mutex_lock(&info->lock); + run_threaded_test(info); + mutex_unlock(&info->lock); + } + + if (params->iterations && wait) + wait_event(thread_wait, !is_threaded_test_run(info)); + + /* module parameters are stable, inittime tests are started, + * let userspace take over 'run' control + */ + info->did_init = true; + + return 0; +} +/* when compiled-in wait for drivers to load first */ +late_initcall(dmatest_init); + +static void __exit dmatest_exit(void) +{ + struct dmatest_info *info = &test_info; + + mutex_lock(&info->lock); + stop_threaded_test(info); + mutex_unlock(&info->lock); +} +module_exit(dmatest_exit); + +MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); +MODULE_LICENSE("GPL v2"); |