diff options
Diffstat (limited to 'drivers/dma/dmatest.c')
| -rw-r--r-- | drivers/dma/dmatest.c | 1360 |
1 files changed, 1360 insertions, 0 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c new file mode 100644 index 000000000..ffe621695 --- /dev/null +++ b/drivers/dma/dmatest.c @@ -0,0 +1,1360 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * DMA Engine test module + * + * Copyright (C) 2007 Atmel Corporation + * Copyright (C) 2013 Intel Corporation + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/err.h> +#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/sched/task.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, 0644); +MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer"); + +static char test_device[32]; +module_param_string(device, test_device, sizeof(test_device), 0644); +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, 0644); +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, 0644); +MODULE_PARM_DESC(max_channels, + "Maximum number of channels to use (default: all)"); + +static unsigned int iterations; +module_param(iterations, uint, 0644); +MODULE_PARM_DESC(iterations, + "Iterations before stopping test (default: infinite)"); + +static unsigned int dmatest; +module_param(dmatest, uint, 0644); +MODULE_PARM_DESC(dmatest, + "dmatest 0-memcpy 1-memset (default: 0)"); + +static unsigned int xor_sources = 3; +module_param(xor_sources, uint, 0644); +MODULE_PARM_DESC(xor_sources, + "Number of xor source buffers (default: 3)"); + +static unsigned int pq_sources = 3; +module_param(pq_sources, uint, 0644); +MODULE_PARM_DESC(pq_sources, + "Number of p+q source buffers (default: 3)"); + +static int timeout = 3000; +module_param(timeout, int, 0644); +MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), " + "Pass -1 for infinite timeout"); + +static bool noverify; +module_param(noverify, bool, 0644); +MODULE_PARM_DESC(noverify, "Disable data verification (default: verify)"); + +static bool norandom; +module_param(norandom, bool, 0644); +MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)"); + +static bool verbose; +module_param(verbose, bool, 0644); +MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)"); + +static int alignment = -1; +module_param(alignment, int, 0644); +MODULE_PARM_DESC(alignment, "Custom data address alignment taken as 2^(alignment) (default: not used (-1))"); + +static unsigned int transfer_size; +module_param(transfer_size, uint, 0644); +MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default: not used (0))"); + +static bool polled; +module_param(polled, bool, 0644); +MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts"); + +/** + * 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 + * @noverify: disable data verification + * @norandom: disable random offset setup + * @alignment: custom data address alignment taken as 2^alignment + * @transfer_size: custom transfer size in bytes + * @polled: use polling for completion instead of interrupts + */ +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; + bool norandom; + int alignment; + unsigned int transfer_size; + bool polled; +}; + +/** + * struct dmatest_info - test information. + * @params: test parameters + * @channels: channels under test + * @nr_channels: number of channels under test + * @lock: access protection to the fields of this structure + * @did_init: module has been initialized completely + * @last_error: test has faced configuration issues + */ +static struct dmatest_info { + /* Test parameters */ + struct dmatest_params params; + + /* Internal state */ + struct list_head channels; + unsigned int nr_channels; + int last_error; + 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 const 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, 0644); +MODULE_PARM_DESC(run, "Run the test (default: false)"); + +static int dmatest_chan_set(const char *val, const struct kernel_param *kp); +static int dmatest_chan_get(char *val, const struct kernel_param *kp); +static const struct kernel_param_ops multi_chan_ops = { + .set = dmatest_chan_set, + .get = dmatest_chan_get, +}; + +static char test_channel[20]; +static struct kparam_string newchan_kps = { + .string = test_channel, + .maxlen = 20, +}; +module_param_cb(channel, &multi_chan_ops, &newchan_kps, 0644); +MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)"); + +static int dmatest_test_list_get(char *val, const struct kernel_param *kp); +static const struct kernel_param_ops test_list_ops = { + .get = dmatest_test_list_get, +}; +module_param_cb(test_list, &test_list_ops, NULL, 0444); +MODULE_PARM_DESC(test_list, "Print current test list"); + +/* 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 +#define PATTERN_MEMSET_IDX 0x01 + +/* Fixed point arithmetic ops */ +#define FIXPT_SHIFT 8 +#define FIXPNT_MASK 0xFF +#define FIXPT_TO_INT(a) ((a) >> FIXPT_SHIFT) +#define INT_TO_FIXPT(a) ((a) << FIXPT_SHIFT) +#define FIXPT_GET_FRAC(a) ((((a) & FIXPNT_MASK) * 100) >> FIXPT_SHIFT) + +/* poor man's completion - we want to use wait_event_freezable() on it */ +struct dmatest_done { + bool done; + wait_queue_head_t *wait; +}; + +struct dmatest_data { + u8 **raw; + u8 **aligned; + unsigned int cnt; + unsigned int off; +}; + +struct dmatest_thread { + struct list_head node; + struct dmatest_info *info; + struct task_struct *task; + struct dma_chan *chan; + struct dmatest_data src; + struct dmatest_data dst; + enum dma_transaction_type type; + wait_queue_head_t done_wait; + struct dmatest_done test_done; + bool done; + bool pending; +}; + +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 && !thread->pending) + return true; + } + } + + return false; +} + +static bool is_threaded_test_pending(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->pending) + 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 const struct kernel_param_ops wait_ops = { + .get = dmatest_wait_get, + .set = param_set_bool, +}; +module_param_cb(wait, &wait_ops, &wait, 0444); +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; + + get_random_bytes(&buf, sizeof(buf)); + return buf; +} + +static inline u8 gen_inv_idx(u8 index, bool is_memset) +{ + u8 val = is_memset ? PATTERN_MEMSET_IDX : index; + + return ~val & PATTERN_COUNT_MASK; +} + +static inline u8 gen_src_value(u8 index, bool is_memset) +{ + return PATTERN_SRC | gen_inv_idx(index, is_memset); +} + +static inline u8 gen_dst_value(u8 index, bool is_memset) +{ + return PATTERN_DST | gen_inv_idx(index, is_memset); +} + +static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len, + unsigned int buf_size, bool is_memset) +{ + unsigned int i; + u8 *buf; + + for (; (buf = *bufs); bufs++) { + for (i = 0; i < start; i++) + buf[i] = gen_src_value(i, is_memset); + for ( ; i < start + len; i++) + buf[i] = gen_src_value(i, is_memset) | PATTERN_COPY; + for ( ; i < buf_size; i++) + buf[i] = gen_src_value(i, is_memset); + buf++; + } +} + +static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len, + unsigned int buf_size, bool is_memset) +{ + unsigned int i; + u8 *buf; + + for (; (buf = *bufs); bufs++) { + for (i = 0; i < start; i++) + buf[i] = gen_dst_value(i, is_memset); + for ( ; i < start + len; i++) + buf[i] = gen_dst_value(i, is_memset) | + PATTERN_OVERWRITE; + for ( ; i < buf_size; i++) + buf[i] = gen_dst_value(i, is_memset); + } +} + +static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index, + unsigned int counter, bool is_srcbuf, bool is_memset) +{ + u8 diff = actual ^ pattern; + u8 expected = pattern | gen_inv_idx(counter, is_memset); + 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, bool is_memset) +{ + 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 | gen_inv_idx(counter, is_memset); + if (actual != expected) { + if (error_count < MAX_ERROR_COUNT) + dmatest_mismatch(actual, pattern, i, + counter, is_srcbuf, + is_memset); + 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; +} + + +static void dmatest_callback(void *arg) +{ + struct dmatest_done *done = arg; + struct dmatest_thread *thread = + container_of(done, struct dmatest_thread, test_done); + if (!thread->done) { + done->done = true; + wake_up_all(done->wait); + } else { + /* + * If thread->done, it means that this callback occurred + * after the parent thread has cleaned up. This can + * happen in the case that driver doesn't implement + * the terminate_all() functionality and a dma operation + * did not occur within the timeout period + */ + WARN(1, "dmatest: Kernel memory may be corrupted!!\n"); + } +} + +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) +{ + if (IS_ERR_VALUE(data)) { + pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%ld)\n", + current->comm, n, err, src_off, dst_off, len, data); + } else { + 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; + per_sec = INT_TO_FIXPT(per_sec); + do_div(per_sec, runtime); + + return per_sec; +} + +static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len) +{ + return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10)); +} + +static void __dmatest_free_test_data(struct dmatest_data *d, unsigned int cnt) +{ + unsigned int i; + + for (i = 0; i < cnt; i++) + kfree(d->raw[i]); + + kfree(d->aligned); + kfree(d->raw); +} + +static void dmatest_free_test_data(struct dmatest_data *d) +{ + __dmatest_free_test_data(d, d->cnt); +} + +static int dmatest_alloc_test_data(struct dmatest_data *d, + unsigned int buf_size, u8 align) +{ + unsigned int i = 0; + + d->raw = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL); + if (!d->raw) + return -ENOMEM; + + d->aligned = kcalloc(d->cnt + 1, sizeof(u8 *), GFP_KERNEL); + if (!d->aligned) + goto err; + + for (i = 0; i < d->cnt; i++) { + d->raw[i] = kmalloc(buf_size + align, GFP_KERNEL); + if (!d->raw[i]) + goto err; + + /* align to alignment restriction */ + if (align) + d->aligned[i] = PTR_ALIGN(d->raw[i], align); + else + d->aligned[i] = d->raw[i]; + } + + return 0; +err: + __dmatest_free_test_data(d, i); + return -ENOMEM; +} + +/* + * 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) +{ + struct dmatest_thread *thread = data; + struct dmatest_done *done = &thread->test_done; + struct dmatest_info *info; + struct dmatest_params *params; + struct dma_chan *chan; + struct dma_device *dev; + struct device *dma_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; + unsigned int buf_size; + struct dmatest_data *src; + struct dmatest_data *dst; + int i; + ktime_t ktime, start, diff; + ktime_t filltime = 0; + ktime_t comparetime = 0; + s64 runtime = 0; + unsigned long long total_len = 0; + unsigned long long iops = 0; + u8 align = 0; + bool is_memset = false; + dma_addr_t *srcs; + dma_addr_t *dma_pq; + + set_freezable(); + + ret = -ENOMEM; + + smp_rmb(); + thread->pending = false; + info = thread->info; + params = &info->params; + chan = thread->chan; + dev = chan->device; + dma_dev = dmaengine_get_dma_device(chan); + + src = &thread->src; + dst = &thread->dst; + if (thread->type == DMA_MEMCPY) { + align = params->alignment < 0 ? dev->copy_align : + params->alignment; + src->cnt = dst->cnt = 1; + } else if (thread->type == DMA_MEMSET) { + align = params->alignment < 0 ? dev->fill_align : + params->alignment; + src->cnt = dst->cnt = 1; + is_memset = true; + } 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; + align = params->alignment < 0 ? dev->xor_align : + params->alignment; + } 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; + align = params->alignment < 0 ? dev->pq_align : + params->alignment; + + 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; + + /* Check if buffer count fits into map count variable (u8) */ + if ((src->cnt + dst->cnt) >= 255) { + pr_err("too many buffers (%d of 255 supported)\n", + src->cnt + dst->cnt); + goto err_free_coefs; + } + + buf_size = params->buf_size; + if (1 << align > buf_size) { + pr_err("%u-byte buffer too small for %d-byte alignment\n", + buf_size, 1 << align); + goto err_free_coefs; + } + + if (dmatest_alloc_test_data(src, buf_size, align) < 0) + goto err_free_coefs; + + if (dmatest_alloc_test_data(dst, buf_size, align) < 0) + goto err_src; + + set_user_nice(current, 10); + + srcs = kcalloc(src->cnt, sizeof(dma_addr_t), GFP_KERNEL); + if (!srcs) + goto err_dst; + + dma_pq = kcalloc(dst->cnt, sizeof(dma_addr_t), GFP_KERNEL); + if (!dma_pq) + goto err_srcs_array; + + /* + * src and dst buffers are freed by ourselves below + */ + if (params->polled) + flags = DMA_CTRL_ACK; + else + 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 *dsts; + unsigned int len; + + total_tests++; + + if (params->transfer_size) { + if (params->transfer_size >= buf_size) { + pr_err("%u-byte transfer size must be lower than %u-buffer size\n", + params->transfer_size, buf_size); + break; + } + len = params->transfer_size; + } else if (params->norandom) { + len = buf_size; + } else { + len = dmatest_random() % buf_size + 1; + } + + /* Do not alter transfer size explicitly defined by user */ + if (!params->transfer_size) { + len = (len >> align) << align; + if (!len) + len = 1 << align; + } + total_len += len; + + if (params->norandom) { + src->off = 0; + dst->off = 0; + } else { + src->off = dmatest_random() % (buf_size - len + 1); + dst->off = dmatest_random() % (buf_size - len + 1); + + src->off = (src->off >> align) << align; + dst->off = (dst->off >> align) << align; + } + + if (!params->noverify) { + start = ktime_get(); + dmatest_init_srcs(src->aligned, src->off, len, + buf_size, is_memset); + dmatest_init_dsts(dst->aligned, dst->off, len, + buf_size, is_memset); + + diff = ktime_sub(ktime_get(), start); + filltime = ktime_add(filltime, diff); + } + + um = dmaengine_get_unmap_data(dma_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 = buf_size; + for (i = 0; i < src->cnt; i++) { + void *buf = src->aligned[i]; + struct page *pg = virt_to_page(buf); + unsigned long pg_off = offset_in_page(buf); + + um->addr[i] = dma_map_page(dma_dev, pg, pg_off, + um->len, DMA_TO_DEVICE); + srcs[i] = um->addr[i] + src->off; + ret = dma_mapping_error(dma_dev, um->addr[i]); + if (ret) { + result("src mapping error", total_tests, + src->off, dst->off, len, ret); + goto error_unmap_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 = dst->aligned[i]; + struct page *pg = virt_to_page(buf); + unsigned long pg_off = offset_in_page(buf); + + dsts[i] = dma_map_page(dma_dev, pg, pg_off, um->len, + DMA_BIDIRECTIONAL); + ret = dma_mapping_error(dma_dev, dsts[i]); + if (ret) { + result("dst mapping error", total_tests, + src->off, dst->off, len, ret); + goto error_unmap_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_MEMSET) + tx = dev->device_prep_dma_memset(chan, + dsts[0] + dst->off, + *(src->aligned[0] + src->off), + 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) { + 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) { + result("prep error", total_tests, src->off, + dst->off, len, ret); + msleep(100); + goto error_unmap_continue; + } + + done->done = false; + if (!params->polled) { + tx->callback = dmatest_callback; + tx->callback_param = done; + } + cookie = tx->tx_submit(tx); + + if (dma_submit_error(cookie)) { + result("submit error", total_tests, src->off, + dst->off, len, ret); + msleep(100); + goto error_unmap_continue; + } + + if (params->polled) { + status = dma_sync_wait(chan, cookie); + dmaengine_terminate_sync(chan); + if (status == DMA_COMPLETE) + done->done = true; + } else { + dma_async_issue_pending(chan); + + wait_event_freezable_timeout(thread->done_wait, + done->done, + msecs_to_jiffies(params->timeout)); + + status = dma_async_is_tx_complete(chan, cookie, NULL, + NULL); + } + + if (!done->done) { + result("test timed out", total_tests, src->off, dst->off, + len, 0); + goto error_unmap_continue; + } else if (status != DMA_COMPLETE && + !(dma_has_cap(DMA_COMPLETION_NO_ORDER, + dev->cap_mask) && + status == DMA_OUT_OF_ORDER)) { + result(status == DMA_ERROR ? + "completion error status" : + "completion busy status", total_tests, src->off, + dst->off, len, ret); + goto error_unmap_continue; + } + + dmaengine_unmap_put(um); + + if (params->noverify) { + verbose_result("test passed", total_tests, src->off, + dst->off, len, 0); + continue; + } + + start = ktime_get(); + pr_debug("%s: verifying source buffer...\n", current->comm); + error_count = dmatest_verify(src->aligned, 0, src->off, + 0, PATTERN_SRC, true, is_memset); + error_count += dmatest_verify(src->aligned, src->off, + src->off + len, src->off, + PATTERN_SRC | PATTERN_COPY, true, is_memset); + error_count += dmatest_verify(src->aligned, src->off + len, + buf_size, src->off + len, + PATTERN_SRC, true, is_memset); + + pr_debug("%s: verifying dest buffer...\n", current->comm); + error_count += dmatest_verify(dst->aligned, 0, dst->off, + 0, PATTERN_DST, false, is_memset); + + error_count += dmatest_verify(dst->aligned, dst->off, + dst->off + len, src->off, + PATTERN_SRC | PATTERN_COPY, false, is_memset); + + error_count += dmatest_verify(dst->aligned, dst->off + len, + buf_size, dst->off + len, + PATTERN_DST, false, is_memset); + + diff = ktime_sub(ktime_get(), start); + comparetime = ktime_add(comparetime, diff); + + 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); + } + + continue; + +error_unmap_continue: + dmaengine_unmap_put(um); + failed_tests++; + } + ktime = ktime_sub(ktime_get(), ktime); + ktime = ktime_sub(ktime, comparetime); + ktime = ktime_sub(ktime, filltime); + runtime = ktime_to_us(ktime); + + ret = 0; + kfree(dma_pq); +err_srcs_array: + kfree(srcs); +err_dst: + dmatest_free_test_data(dst); +err_src: + dmatest_free_test_data(src); +err_free_coefs: + kfree(pq_coefs); +err_thread_type: + iops = dmatest_persec(runtime, total_tests); + pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n", + current->comm, total_tests, failed_tests, + FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops), + dmatest_KBs(runtime, total_len), ret); + + /* terminate all transfers on specified channels */ + if (ret || failed_tests) + dmaengine_terminate_sync(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_sync(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_MEMSET) + op = "set"; + 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; + thread->test_done.wait = &thread->done_wait; + init_waitqueue_head(&thread->done_wait); + 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); + thread->pending = true; + } + + 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_COMPLETION_NO_ORDER, dma_dev->cap_mask) && + info->params.polled) { + info->params.polled = false; + pr_warn("DMA_COMPLETION_NO_ORDER, polled disabled\n"); + } + + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { + if (dmatest == 0) { + cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY); + thread_count += cnt > 0 ? cnt : 0; + } + } + + if (dma_has_cap(DMA_MEMSET, dma_dev->cap_mask)) { + if (dmatest == 1) { + cnt = dmatest_add_threads(info, dtc, DMA_MEMSET); + 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("Added %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) +{ + return dmatest_match_channel(param, chan) && dmatest_match_device(param, chan->device); +} + +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 add_threaded_test(struct dmatest_info *info) +{ + struct dmatest_params *params = &info->params; + + /* Copy test parameters */ + params->buf_size = test_buf_size; + strscpy(params->channel, strim(test_channel), sizeof(params->channel)); + strscpy(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; + params->norandom = norandom; + params->alignment = alignment; + params->transfer_size = transfer_size; + params->polled = polled; + + request_channels(info, DMA_MEMCPY); + request_channels(info, DMA_MEMSET); + request_channels(info, DMA_XOR); + request_channels(info, DMA_PQ); +} + +static void run_pending_tests(struct dmatest_info *info) +{ + struct dmatest_chan *dtc; + unsigned int thread_count = 0; + + list_for_each_entry(dtc, &info->channels, node) { + struct dmatest_thread *thread; + + thread_count = 0; + list_for_each_entry(thread, &dtc->threads, node) { + wake_up_process(thread->task); + thread_count++; + } + pr_info("Started %u threads using %s\n", + thread_count, dma_chan_name(dtc->chan)); + } +} + +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 start_threaded_tests(struct dmatest_info *info) +{ + /* we might be called early to set run=, defer running until all + * parameters have been evaluated + */ + if (!info->did_init) + return; + + run_pending_tests(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 { + if (!is_threaded_test_pending(info)) + 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; + } else if (dmatest_run) { + if (!is_threaded_test_pending(info)) { + /* + * We have nothing to run. This can be due to: + */ + ret = info->last_error; + if (ret) { + /* 1) Misconfiguration */ + pr_err("Channel misconfigured, can't continue\n"); + mutex_unlock(&info->lock); + return ret; + } else { + /* 2) We rely on defaults */ + pr_info("No channels configured, continue with any\n"); + if (!is_threaded_test_run(info)) + stop_threaded_test(info); + add_threaded_test(info); + } + } + start_threaded_tests(info); + } else { + stop_threaded_test(info); + } + + mutex_unlock(&info->lock); + + return ret; +} + +static int dmatest_chan_set(const char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + struct dmatest_chan *dtc; + char chan_reset_val[20]; + int ret; + + mutex_lock(&info->lock); + ret = param_set_copystring(val, kp); + if (ret) { + mutex_unlock(&info->lock); + return ret; + } + /*Clear any previously run threads */ + if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) + stop_threaded_test(info); + /* Reject channels that are already registered */ + if (is_threaded_test_pending(info)) { + list_for_each_entry(dtc, &info->channels, node) { + if (strcmp(dma_chan_name(dtc->chan), + strim(test_channel)) == 0) { + dtc = list_last_entry(&info->channels, + struct dmatest_chan, + node); + strscpy(chan_reset_val, + dma_chan_name(dtc->chan), + sizeof(chan_reset_val)); + ret = -EBUSY; + goto add_chan_err; + } + } + } + + add_threaded_test(info); + + /* Check if channel was added successfully */ + if (!list_empty(&info->channels)) { + /* + * if new channel was not successfully added, revert the + * "test_channel" string to the name of the last successfully + * added channel. exception for when users issues empty string + * to channel parameter. + */ + dtc = list_last_entry(&info->channels, struct dmatest_chan, node); + if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0) + && (strcmp("", strim(test_channel)) != 0)) { + ret = -EINVAL; + strscpy(chan_reset_val, dma_chan_name(dtc->chan), + sizeof(chan_reset_val)); + goto add_chan_err; + } + + } else { + /* Clear test_channel if no channels were added successfully */ + strscpy(chan_reset_val, "", sizeof(chan_reset_val)); + ret = -EBUSY; + goto add_chan_err; + } + + info->last_error = ret; + mutex_unlock(&info->lock); + + return ret; + +add_chan_err: + param_set_copystring(chan_reset_val, kp); + info->last_error = ret; + mutex_unlock(&info->lock); + + return ret; +} + +static int dmatest_chan_get(char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + + mutex_lock(&info->lock); + if (!is_threaded_test_run(info) && !is_threaded_test_pending(info)) { + stop_threaded_test(info); + strscpy(test_channel, "", sizeof(test_channel)); + } + mutex_unlock(&info->lock); + + return param_get_string(val, kp); +} + +static int dmatest_test_list_get(char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + struct dmatest_chan *dtc; + unsigned int thread_count = 0; + + list_for_each_entry(dtc, &info->channels, node) { + struct dmatest_thread *thread; + + thread_count = 0; + list_for_each_entry(thread, &dtc->threads, node) { + thread_count++; + } + pr_info("%u threads using %s\n", + thread_count, dma_chan_name(dtc->chan)); + } + + return 0; +} + +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); + add_threaded_test(info); + run_pending_tests(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"); |