-----Original Message----- From: sound-open-firmware-bounces@alsa-project.org [mailto:sound-open- firmware-bounces@alsa-project.org] On Behalf Of Wu Zhigang Sent: Thursday, June 21, 2018 5:57 PM To: sound-open-firmware@alsa-project.org Cc: Wu Zhigang zhigang.wu@linux.intel.com Subject: [Sound-open-firmware] [PATCH] [RFC]platform: calculate the percentage of cpu cycle
calculate the percentage of cpu cyle based on the CCOUNT register. which can tell the percentage of cpu cycle usage.
Signed-off-by: Wu Zhigang zhigang.wu@linux.intel.com
src/audio/dai.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/src/audio/dai.c b/src/audio/dai.c index 99749d1..7811e38 100644 --- a/src/audio/dai.c +++ b/src/audio/dai.c @@ -72,6 +72,21 @@ struct dai_data { uint64_t wallclock; /* wall clock at stream start */ };
+/* for apollolake, it is 400MHz per 1s */ +#define CPU_CYCLE_PER_MS 400000
+static void calc_mcps(struct pipeline *p) {
- uint32_t cpu_cycle = 0;
- uint32_t deta = 0;
- __asm__ __volatile__ ("rsr %0, CCOUNT" : "=a" (cpu_cycle) : : "memory");
I think you should use ICOUNT, not CCOUNT.
Thanks, ~Keyon
- deta = cpu_cycle - p->cpu_cycle;
- p->cpu_cycle = cpu_cycle;
- deta = (deta * 100) / CPU_CYCLE_PER_MS;
- trace_error_value(deta); /* the percentage of the cpu cycle in 1ms */
+}
/* this is called by DMA driver every time descriptor has completed */ static void dai_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next) { @@ -81,6 +96,8 @@ static void dai_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next)
tracev_dai("irq");
- calc_mcps(dev->pipeline);
- /* stop dma copy for pause/stop/xrun */ if (dev->state != COMP_STATE_ACTIVE || dd->xrun) {
-- 2.17.1
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