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devfreq: Weight stall cycles more for GPU bus DCVS

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Update GPU Bus DCVS to weight high stall cycles (as a percentage
of total bus usage) heavier in order to vote up the bus when the
GPU is stalling a lot waiting for data.

Change-Id: I8a331a48a1ab737c51f1001ea1991f09af9ef900
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
This commit is contained in:
Kyle Piefer 2018-10-12 13:39:54 -07:00 • committed by Michael Bestas
commit 1b90dac849
1 changed files with 6 additions and 1 deletions
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7
drivers/devfreq/governor_gpubw_mon.c
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@ -24,6 +24,7 @@
#define HIST 5
#define TARGET 80
#define CAP 75
#define WAIT_THRESHOLD 10
/* AB vote is in multiple of BW_STEP Mega bytes */
#define BW_STEP 160
@ -67,6 +68,7 @@ static int devfreq_gpubw_get_target(struct devfreq *df,
int act_level;
int norm_max_cycles;
int norm_cycles;
int wait_active_percent;
int gpu_percent;
/*
* Normalized AB should at max usage be the gpu_bimc frequency in MHz.
@ -99,6 +101,8 @@ static int devfreq_gpubw_get_target(struct devfreq *df,
(unsigned int) priv->bus.total_time;
norm_cycles = (unsigned int)(priv->bus.ram_time + priv->bus.ram_wait) /
(unsigned int) priv->bus.total_time;
wait_active_percent = (100 * (unsigned int)priv->bus.ram_wait) /
(unsigned int) priv->bus.ram_time;
gpu_percent = (100 * (unsigned int)priv->bus.gpu_time) /
(unsigned int) priv->bus.total_time;
@ -117,7 +121,8 @@ static int devfreq_gpubw_get_target(struct devfreq *df,
act_level = (act_level < 0) ? 0 : act_level;
act_level = (act_level >= priv->bus.num) ?
(priv->bus.num - 1) : act_level;
if (norm_cycles > priv->bus.up[act_level] &&
if ((norm_cycles > priv->bus.up[act_level] ||
wait_active_percent > WAIT_THRESHOLD) &&
gpu_percent > CAP)
bus_profile->flag = DEVFREQ_FLAG_FAST_HINT;
else if (norm_cycles < priv->bus.down[act_level] && level)