dmaengine: dmatest: Use fixed point div to calculate iops (6138f967) · Commits · 戴 / test

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 @@ 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 */

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