Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-22 20:22:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

Power management fixes for 6.4-rc4

Browse Source 
Fix 3 issues related to the ->fast_switch callback in the AMD
 P-state cpufreq driver (Gautham R. Shenoy and Wyes Karny).
 -----BEGIN PGP SIGNATURE-----
 
 iQJGBAABCAAwFiEE4fcc61cGeeHD/fCwgsRv/nhiVHEFAmRw2+cSHHJqd0Byand5
 c29ja2kubmV0AAoJEILEb/54YlRxW68P/2W9mcDxlepkfN9KEUgZ6ianmoRdHqSU
 KpL8uB4Snavd0QQYnRUbNPeDht5cAMZT1cEzmcdkGAzGz2SpD/44LH0T8zFO24aM
 SAdlo6j72VWiRmR5POvEZbKPRczCWFPlpqKkQyh227Msb5tGayo7fRa1VpRqo/AH
 YwYWaW5Ur5XfU0c8E5K+P3Rj2dz+RsFzZ4chb5yd14ae2Qr8f6EnOVte0ja0bFUF
 uPneqJ27U4MoDW1s/bkud32lJTeGLi8BwgIIyP6L7a8m5QdWxv+pTZMsa/NW7a+v
 3+3GrXoLZp6xeBGdt0z6/04BwpcRUh6ZpVlloGeYoSMpnQpGleqeJaVepWZCAKDm
 K0Gc7nLTLQUMO877oOz17cDLdDgXbIDmngw9ubEW0N7g5yOGzSCTfQyYYItN0dky
 mnTMXU5TM2LktH3V1y34HTTZTZU5TDZkLzoFNAgHqmlFhEqEdaN6l5AJJ6rPt9IM
 ZwJNpLz3R4rQ+XwGofebQGSlwpQVAzUrigiHJ2VJAbFxWqw4iohYkgD+1e8B/VzG
 e5DygskN1FFTJ7oMXlPSDWqulCRghOillqtUWocdHJAbnkglkLpexxqUAsoNahDt
 qA553sM5/lp29uNlpuz6AbqHscjOto94aC3uK3kxNUGsDy6CRcbn5VVIN5ceDVk+
 SnzKHfnh65vv
 =6XJv
 -----END PGP SIGNATURE-----

Merge tag 'pm-6.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Fix three issues related to the ->fast_switch callback in the AMD
  P-state cpufreq driver (Gautham R. Shenoy and Wyes Karny)"

* tag 'pm-6.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: amd-pstate: Update policy->cur in amd_pstate_adjust_perf()
  cpufreq: amd-pstate: Remove fast_switch_possible flag from active driver
  cpufreq: amd-pstate: Add ->fast_switch() callback
This commit is contained in:
Linus Torvalds 2023-05-26 13:45:43 -07:00
commit c551afcdc3
1 changed files with 37 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/cpufreq/amd-pstate.c
View File

@ -444,9 +444,8 @@ static int amd_pstate_verify(struct cpufreq_policy_data *policy)
return 0;
}
static int amd_pstate_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
static int amd_pstate_update_freq(struct cpufreq_policy *policy,
unsigned int target_freq, bool fast_switch)
{
struct cpufreq_freqs freqs;
struct amd_cpudata *cpudata = policy->driver_data;
@ -465,26 +464,51 @@ static int amd_pstate_target(struct cpufreq_policy *policy,
des_perf = DIV_ROUND_CLOSEST(target_freq * cap_perf,
cpudata->max_freq);
cpufreq_freq_transition_begin(policy, &freqs);
WARN_ON(fast_switch && !policy->fast_switch_enabled);
/*
* If fast_switch is desired, then there aren't any registered
* transition notifiers. See comment for
* cpufreq_enable_fast_switch().
*/
if (!fast_switch)
cpufreq_freq_transition_begin(policy, &freqs);
amd_pstate_update(cpudata, min_perf, des_perf,
max_perf, false, policy->governor->flags);
cpufreq_freq_transition_end(policy, &freqs, false);
max_perf, fast_switch, policy->governor->flags);
if (!fast_switch)
cpufreq_freq_transition_end(policy, &freqs, false);
return 0;
}
static int amd_pstate_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
return amd_pstate_update_freq(policy, target_freq, false);
}
static unsigned int amd_pstate_fast_switch(struct cpufreq_policy *policy,
unsigned int target_freq)
{
return amd_pstate_update_freq(policy, target_freq, true);
}
static void amd_pstate_adjust_perf(unsigned int cpu,
unsigned long _min_perf,
unsigned long target_perf,
unsigned long capacity)
{
unsigned long max_perf, min_perf, des_perf,
cap_perf, lowest_nonlinear_perf;
cap_perf, lowest_nonlinear_perf, max_freq;
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct amd_cpudata *cpudata = policy->driver_data;
unsigned int target_freq;
cap_perf = READ_ONCE(cpudata->highest_perf);
lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
max_freq = READ_ONCE(cpudata->max_freq);
des_perf = cap_perf;
if (target_perf < capacity)
@ -501,6 +525,10 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
if (max_perf < min_perf)
max_perf = min_perf;
des_perf = clamp_t(unsigned long, des_perf, min_perf, max_perf);
target_freq = div_u64(des_perf * max_freq, max_perf);
policy->cur = target_freq;
amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true,
policy->governor->flags);
cpufreq_cpu_put(policy);
@ -715,6 +743,7 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
freq_qos_remove_request(&cpudata->req[1]);
freq_qos_remove_request(&cpudata->req[0]);
policy->fast_switch_possible = false;
kfree(cpudata);
return 0;
@ -1079,7 +1108,6 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
policy->policy = CPUFREQ_POLICY_POWERSAVE;
if (boot_cpu_has(X86_FEATURE_CPPC)) {
policy->fast_switch_possible = true;
ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, &value);
if (ret)
return ret;
@ -1102,7 +1130,6 @@ free_cpudata1:
static int amd_pstate_epp_cpu_exit(struct cpufreq_policy *policy)
{
pr_debug("CPU %d exiting\n", policy->cpu);
policy->fast_switch_possible = false;
return 0;
}
@ -1309,6 +1336,7 @@ static struct cpufreq_driver amd_pstate_driver = {
.flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
.verify = amd_pstate_verify,
.target = amd_pstate_target,
.fast_switch = amd_pstate_fast_switch,
.init = amd_pstate_cpu_init,
.exit = amd_pstate_cpu_exit,
.suspend = amd_pstate_cpu_suspend,