#include <linux/delay.h>
#include <linux/sizes.h>
#include <linux/ntb.h>
+#include <linux/mutex.h>
#define DRIVER_NAME "ntb_perf"
#define DRIVER_DESCRIPTION "PCIe NTB Performance Measurement Tool"
static struct dentry *perf_debugfs_dir;
+static unsigned long max_mw_size;
+module_param(max_mw_size, ulong, 0644);
+MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows");
+
static unsigned int seg_order = 19; /* 512K */
module_param(seg_order, uint, 0644);
MODULE_PARM_DESC(seg_order, "size order [n^2] of buffer segment for testing");
int dma_prep_err;
int src_idx;
void *srcs[MAX_SRCS];
+ wait_queue_head_t *wq;
};
struct perf_ctx {
struct dentry *debugfs_run;
struct dentry *debugfs_threads;
u8 perf_threads;
- bool run;
+ /* mutex ensures only one set of threads run at once */
+ struct mutex run_mutex;
struct pthr_ctx pthr_ctx[MAX_THREADS];
atomic_t tsync;
+ atomic_t tdone;
};
enum {
VERSION = 0,
MW_SZ_HIGH,
MW_SZ_LOW,
- SPAD_MSG,
- SPAD_ACK,
MAX_SPAD
};
char __iomem *tmp = dst;
u64 perf, diff_us;
ktime_t kstart, kstop, kdiff;
+ unsigned long last_sleep = jiffies;
chunks = div64_u64(win_size, buf_size);
total_chunks = div64_u64(total, buf_size);
} else
tmp += buf_size;
- /* Probably should schedule every 4GB to prevent soft hang. */
- if (((copied % SZ_4G) == 0) && !use_dma) {
+ /* Probably should schedule every 5s to prevent soft hang. */
+ if (unlikely((jiffies - last_sleep) > 5 * HZ)) {
+ last_sleep = jiffies;
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(1);
}
+
+ if (unlikely(kthread_should_stop()))
+ break;
}
if (use_dma) {
pr_info("%s: All DMA descriptors submitted\n", current->comm);
- while (atomic_read(&pctx->dma_sync) != 0)
+ while (atomic_read(&pctx->dma_sync) != 0) {
+ if (kthread_should_stop())
+ break;
msleep(20);
+ }
}
kstop = ktime_get();
pctx->srcs[i] = NULL;
}
- return 0;
+ atomic_inc(&perf->tdone);
+ wake_up(pctx->wq);
+ rc = 0;
+ goto done;
err:
for (i = 0; i < MAX_SRCS; i++) {
pctx->dma_chan = NULL;
}
+done:
+ /* Wait until we are told to stop */
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (kthread_should_stop())
+ break;
+ schedule();
+ }
+ __set_current_state(TASK_RUNNING);
+
return rc;
}
dev_dbg(&perf->ntb->pdev->dev, "%s called\n", __func__);
size = perf->mw.phys_size;
+
+ if (max_mw_size && size > max_mw_size)
+ size = max_mw_size;
+
ntb_peer_spad_write(ndev, MW_SZ_HIGH, upper_32_bits(size));
ntb_peer_spad_write(ndev, MW_SZ_LOW, lower_32_bits(size));
ntb_peer_spad_write(ndev, VERSION, PERF_VERSION);
struct perf_ctx *perf = filp->private_data;
char *buf;
ssize_t ret, out_offset;
+ int running;
if (!perf)
return 0;
buf = kmalloc(64, GFP_KERNEL);
if (!buf)
return -ENOMEM;
- out_offset = snprintf(buf, 64, "%d\n", perf->run);
+
+ running = mutex_is_locked(&perf->run_mutex);
+ out_offset = snprintf(buf, 64, "%d\n", running);
ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
kfree(buf);
struct pthr_ctx *pctx;
int i;
- perf->run = false;
for (i = 0; i < MAX_THREADS; i++) {
pctx = &perf->pthr_ctx[i];
if (pctx->thread) {
{
struct perf_ctx *perf = filp->private_data;
int node, i;
+ DECLARE_WAIT_QUEUE_HEAD(wq);
if (!perf->link_is_up)
- return 0;
+ return -ENOLINK;
if (perf->perf_threads == 0)
- return 0;
+ return -EINVAL;
- if (atomic_read(&perf->tsync) == 0)
- perf->run = false;
+ if (!mutex_trylock(&perf->run_mutex))
+ return -EBUSY;
- if (perf->run)
- threads_cleanup(perf);
- else {
- perf->run = true;
+ if (perf->perf_threads > MAX_THREADS) {
+ perf->perf_threads = MAX_THREADS;
+ pr_info("Reset total threads to: %u\n", MAX_THREADS);
+ }
- if (perf->perf_threads > MAX_THREADS) {
- perf->perf_threads = MAX_THREADS;
- pr_info("Reset total threads to: %u\n", MAX_THREADS);
- }
+ /* no greater than 1M */
+ if (seg_order > MAX_SEG_ORDER) {
+ seg_order = MAX_SEG_ORDER;
+ pr_info("Fix seg_order to %u\n", seg_order);
+ }
- /* no greater than 1M */
- if (seg_order > MAX_SEG_ORDER) {
- seg_order = MAX_SEG_ORDER;
- pr_info("Fix seg_order to %u\n", seg_order);
- }
+ if (run_order < seg_order) {
+ run_order = seg_order;
+ pr_info("Fix run_order to %u\n", run_order);
+ }
- if (run_order < seg_order) {
- run_order = seg_order;
- pr_info("Fix run_order to %u\n", run_order);
- }
+ node = dev_to_node(&perf->ntb->pdev->dev);
+ atomic_set(&perf->tdone, 0);
- node = dev_to_node(&perf->ntb->pdev->dev);
- /* launch kernel thread */
- for (i = 0; i < perf->perf_threads; i++) {
- struct pthr_ctx *pctx;
-
- pctx = &perf->pthr_ctx[i];
- atomic_set(&pctx->dma_sync, 0);
- pctx->perf = perf;
- pctx->thread =
- kthread_create_on_node(ntb_perf_thread,
- (void *)pctx,
- node, "ntb_perf %d", i);
- if (IS_ERR(pctx->thread)) {
- pctx->thread = NULL;
- goto err;
- } else
- wake_up_process(pctx->thread);
-
- if (perf->run == false)
- return -ENXIO;
- }
+ /* launch kernel thread */
+ for (i = 0; i < perf->perf_threads; i++) {
+ struct pthr_ctx *pctx;
+ pctx = &perf->pthr_ctx[i];
+ atomic_set(&pctx->dma_sync, 0);
+ pctx->perf = perf;
+ pctx->wq = &wq;
+ pctx->thread =
+ kthread_create_on_node(ntb_perf_thread,
+ (void *)pctx,
+ node, "ntb_perf %d", i);
+ if (IS_ERR(pctx->thread)) {
+ pctx->thread = NULL;
+ goto err;
+ } else {
+ wake_up_process(pctx->thread);
+ }
}
+ wait_event_interruptible(wq,
+ atomic_read(&perf->tdone) == perf->perf_threads);
+
+ threads_cleanup(perf);
+ mutex_unlock(&perf->run_mutex);
return count;
err:
threads_cleanup(perf);
+ mutex_unlock(&perf->run_mutex);
return -ENXIO;
}
int node;
int rc = 0;
+ if (ntb_spad_count(ntb) < MAX_SPAD) {
+ dev_err(&ntb->dev, "Not enough scratch pad registers for %s",
+ DRIVER_NAME);
+ return -EIO;
+ }
+
node = dev_to_node(&pdev->dev);
perf = kzalloc_node(sizeof(*perf), GFP_KERNEL, node);
perf->ntb = ntb;
perf->perf_threads = 1;
atomic_set(&perf->tsync, 0);
- perf->run = false;
+ mutex_init(&perf->run_mutex);
spin_lock_init(&perf->db_lock);
perf_setup_mw(ntb, perf);
INIT_DELAYED_WORK(&perf->link_work, perf_link_work);
dev_dbg(&perf->ntb->dev, "%s called\n", __func__);
+ mutex_lock(&perf->run_mutex);
+
cancel_delayed_work_sync(&perf->link_work);
cancel_work_sync(&perf->link_cleanup);
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