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| author | Seraj Alijan <seraj.alijan@sondrel.com> | 2018-12-10 11:52:34 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2018-12-17 09:15:11 +0300 |
| commit | 6138f967bccc7a84a167769c2e045c346ad37191 (patch) | |
| tree | 04d0846480f08033e255d1c4ddd1699d7e3ed883 /drivers/dma | |
| parent | d53513d5dc285d9a95a534fc41c5c08af6b60eac (diff) | |
| download | linux-6138f967bccc7a84a167769c2e045c346ad37191.tar.xz | |
dmaengine: dmatest: Use fixed point div to calculate iops
Use fixed point division to calculate iops to prevent reporting 0 iops
when operations last for longer than a second.
Signed-off-by: Seraj Alijan <seraj.alijan@sondrel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dmatest.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index d19277234c2d..998344b0fb7a 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -177,6 +177,13 @@ MODULE_PARM_DESC(test_list, "Print current test list"); #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; @@ -453,13 +460,15 @@ static unsigned long long dmatest_persec(s64 runtime, unsigned int val) } 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 dmatest_persec(runtime, len >> 10); + return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10)); } /* @@ -500,6 +509,7 @@ static int dmatest_func(void *data) 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; @@ -838,9 +848,10 @@ err_usrcs: err_free_coefs: kfree(pq_coefs); err_thread_type: - pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n", + 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, - dmatest_persec(runtime, total_tests), + FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops), dmatest_KBs(runtime, total_len), ret); /* terminate all transfers on specified channels */ |