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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>
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1 changed files with 14 additions and 3 deletions
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@ -177,6 +177,13 @@ MODULE_PARM_DESC(test_list, "Print current test list");
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#define PATTERN_COUNT_MASK 0x1f
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#define PATTERN_MEMSET_IDX 0x01
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/* Fixed point arithmetic ops */
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#define FIXPT_SHIFT 8
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#define FIXPNT_MASK 0xFF
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#define FIXPT_TO_INT(a) ((a) >> FIXPT_SHIFT)
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#define INT_TO_FIXPT(a) ((a) << FIXPT_SHIFT)
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#define FIXPT_GET_FRAC(a) ((((a) & FIXPNT_MASK) * 100) >> FIXPT_SHIFT)
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/* poor man's completion - we want to use wait_event_freezable() on it */
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struct dmatest_done {
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bool done;
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@ -453,13 +460,15 @@ static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
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}
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per_sec *= val;
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per_sec = INT_TO_FIXPT(per_sec);
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do_div(per_sec, runtime);
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return per_sec;
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}
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static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
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{
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return dmatest_persec(runtime, len >> 10);
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return FIXPT_TO_INT(dmatest_persec(runtime, len >> 10));
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}
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/*
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@ -500,6 +509,7 @@ static int dmatest_func(void *data)
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ktime_t comparetime = 0;
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s64 runtime = 0;
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unsigned long long total_len = 0;
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unsigned long long iops = 0;
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u8 align = 0;
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bool is_memset = false;
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dma_addr_t *srcs;
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@ -838,9 +848,10 @@ static int dmatest_func(void *data)
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err_free_coefs:
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kfree(pq_coefs);
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err_thread_type:
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pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n",
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iops = dmatest_persec(runtime, total_tests);
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pr_info("%s: summary %u tests, %u failures %llu.%02llu iops %llu KB/s (%d)\n",
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current->comm, total_tests, failed_tests,
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dmatest_persec(runtime, total_tests),
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FIXPT_TO_INT(iops), FIXPT_GET_FRAC(iops),
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dmatest_KBs(runtime, total_len), ret);
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/* terminate all transfers on specified channels */
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