Ksawlii/kernel_samsung_a53x
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acpm_dvfs: Remove sched_clock() calls

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Calling the architected timer adds nontrivial overhead as observed in perf
top, especially since the DVFS functions are hot paths.

Remove all of the sched_clock() calls since they're unneeded by ACPM.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Nahuel Gómez <nahuelgomez329@gmail.com>
This commit is contained in:
Sultan Alsawaf 2024-01-18 22:40:58 -08:00 • committed by Ksawlii
parent a5f833d5c7
commit f5e2e1c94e
1 changed files with 5 additions and 29 deletions
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34
drivers/soc/samsung/cal-if/acpm_dvfs.c
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@ -22,10 +22,8 @@ int exynos_acpm_set_rate(unsigned int id, unsigned long rate, bool fast_switch)
{
struct ipc_config config;
unsigned int cmd[4];
unsigned long long before, after, latency;
unsigned int ch;
int ret;
u32 start_time = acpm_get_peri_timer();
config.cmd = cmd;
config.response = !fast_switch;
@ -33,21 +31,16 @@ int exynos_acpm_set_rate(unsigned int id, unsigned long rate, bool fast_switch)
config.cmd[0] = id;
config.cmd[1] = (unsigned int)rate;
config.cmd[2] = fast_switch ? FREQ_REQ_FAST : FREQ_REQ;
config.cmd[3] = (start_time == 0xFFFF) ? 0 : start_time;
config.cmd[3] = 0;
ch = fast_switch ? acpm_dvfs.fast_ch_num : acpm_dvfs.ch_num;
#if defined(CONFIG_EXYNOS_DEBUG_FREQ)
secdbg_freq_check(id, rate);
#endif
before = sched_clock();
ret = acpm_ipc_send_data(ch, &config);
after = sched_clock();
latency = after - before;
if (ret)
pr_err("%s:[%d] latency = %llu ret = %d",
__func__, id, latency, ret);
pr_err("%s:[%d] ret = %d", __func__, id, ret);
return ret;
}
EXPORT_SYMBOL_GPL(exynos_acpm_set_rate);
@ -56,7 +49,6 @@ int exynos_acpm_set_init_freq(unsigned int dfs_id, unsigned long freq)
{
struct ipc_config config;
unsigned int cmd[4];
unsigned long long before, after, latency;
int ret, id;
id = GET_IDX(dfs_id);
@ -69,14 +61,9 @@ int exynos_acpm_set_init_freq(unsigned int dfs_id, unsigned long freq)
config.cmd[2] = DATA_INIT;
config.cmd[3] = SET_INIT_FREQ;
before = sched_clock();
ret = acpm_ipc_send_data(acpm_dvfs.ch_num, &config);
after = sched_clock();
latency = after - before;
if (ret)
pr_err("%s:[%d] latency = %llu ret = %d",
__func__, id, latency, ret);
pr_err("%s:[%d] ret = %d", __func__, id, ret);
return ret;
}
EXPORT_SYMBOL_GPL(exynos_acpm_set_init_freq);
@ -85,7 +72,6 @@ unsigned long exynos_acpm_get_rate(unsigned int id)
{
struct ipc_config config;
unsigned int cmd[4];
unsigned long long before, after, latency;
int ret;
config.cmd = cmd;
@ -96,14 +82,9 @@ unsigned long exynos_acpm_get_rate(unsigned int id)
config.cmd[2] = FREQ_GET;
config.cmd[3] = 0;
before = sched_clock();
ret = acpm_ipc_send_data(acpm_dvfs.ch_num, &config);
after = sched_clock();
latency = after - before;
if (ret)
pr_err("%s:[%d] latency = %llu ret = %d", __func__,
id, latency, ret);
pr_err("%s:[%d] ret = %d", __func__, id, ret);
return config.cmd[1];
}
@ -111,7 +92,6 @@ int exynos_acpm_set_volt_margin(unsigned int id, int volt)
{
struct ipc_config config;
unsigned int cmd[4];
unsigned long long before, after, latency;
int ret;
struct vclk *vclk;
@ -123,13 +103,9 @@ int exynos_acpm_set_volt_margin(unsigned int id, int volt)
config.cmd[2] = MARGIN_REQ;
config.cmd[3] = 0;
before = sched_clock();
ret = acpm_ipc_send_data(acpm_dvfs.ch_num, &config);
after = sched_clock();
latency = after - before;
if (ret)
pr_err("%s:[%d] latency = %llu ret = %d",
__func__, id, latency, ret);
pr_err("%s:[%d] ret = %d", __func__, id, ret);
vclk = cmucal_get_node(id);
if (vclk) {