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spdk: show error message when no DMA channel found

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We will check the DMA channel count which associated with kernel
ioatdma driver, and print the error message when no DMA channel
found.

Change-Id: I1d24108acb8fc6ee0c8f6041072e2dd528f55b24
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Changpeng Liu 2016-01-19 17:16:48 +08:00
parent 97601bb358
commit 81a36e1c1a
1 changed files with 34 additions and 0 deletions
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34
examples/ioat/kperf/ioat_kperf.c
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@ -35,6 +35,7 @@
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <inttypes.h>
#include <assert.h>
@ -148,6 +149,29 @@ get_u64_from_file(const char *sysfs_file, uint64_t *value)
return 0;
}
static int
get_dma_channel_count(void)
{
int count = 0;
struct dirent *e;
DIR *dir;
char *str;
dir = opendir("/sys/bus/pci/drivers/ioatdma");
if (dir == NULL) {
return 0;
}
while ((e = readdir(dir)) != NULL) {
str = strstr(e->d_name, ":");
if (str != NULL)
count++;
}
closedir(dir);
return count;
}
static void
usage(char *program_name)
{
@ -164,6 +188,7 @@ int main(int argc, char *argv[])
int op;
int rc;
char buf[BUFSIZ];
uint32_t count = 0;
uint32_t i, threads = 0;
uint32_t ring_size, queue_depth = 0;
uint32_t transfer_size, order = 0;
@ -181,6 +206,11 @@ int main(int argc, char *argv[])
" run `insmod dmaperf.ko` in the kmod directory\n");
return -1;
}
count = get_dma_channel_count();
if (!count) {
fprintf(stderr, "No DMA channel found\n");
return -1;
}
rc = get_u32_from_file("/sys/module/ioatdma/parameters/ioat_ring_alloc_order",
&order);
@ -194,6 +224,10 @@ int main(int argc, char *argv[])
switch (op) {
case 'n':
threads = atoi(optarg);
if (threads > count) {
fprintf(stderr, "Error: Total channel count %u\n", count);
return -1;
}
rc = put_u32_to_file("/sys/kernel/debug/dmaperf/dmaperf/threads", threads);
if (rc < 0) {
fprintf(stderr, "Cannot set dma channels\n");