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Commit 6138f967 authored by Seraj Alijan's avatar Seraj Alijan Committed by Vinod Koul
Browse files

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: default avatarSeraj Alijan <seraj.alijan@sondrel.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent d53513d5

drivers/dma/dmatest.c

+14 −3
Original line number Diff line number Diff line
@@ -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 @@ static int dmatest_func(void *data) 
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 */