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More power management updates for 5.11-rc1 

- Rework the passive-mode "fast switch" path in the intel_pstate
    driver to allow it receive the minimum (required) and target
    (desired) performance information from the schedutil governor so
    as to avoid running some workloads too fast (Rafael Wysocki).
 
  - Make the intel_pstate driver allow the policy max limit to be
    increased after the guaranteed performance value for the given
    CPU has increased (Rafael Wysocki).
 
  - Clean up the handling of CPU coordination types in the CPPC
    cpufreq driver and make it export frequency domains information
    to user space via sysfs (Ionela Voinescu).
 
  - Fix the ACPI code handling processor objects to use a correct
    coordination type when it fails to map frequency domains and drop
    a redundant CPU map initialization from it (Ionela Voinescu, Punit
    Agrawal).
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Merge tag 'pm-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull more power management updates from Rafael Wysocki:
 "These update the CPPC cpufreq driver and intel_pstate (which involves
  updating the cpufreq core and the schedutil governor) and make
  janitorial changes in the ACPI code handling processor objects.

  Specifics:

   - Rework the passive-mode "fast switch" path in the intel_pstate
     driver to allow it receive the minimum (required) and target
     (desired) performance information from the schedutil governor so as
     to avoid running some workloads too fast (Rafael Wysocki).

   - Make the intel_pstate driver allow the policy max limit to be
     increased after the guaranteed performance value for the given CPU
     has increased (Rafael Wysocki).

   - Clean up the handling of CPU coordination types in the CPPC cpufreq
     driver and make it export frequency domains information to user
     space via sysfs (Ionela Voinescu).

   - Fix the ACPI code handling processor objects to use a correct
     coordination type when it fails to map frequency domains and drop a
     redundant CPU map initialization from it (Ionela Voinescu, Punit
     Agrawal)"

* tag 'pm-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: intel_pstate: Use most recent guaranteed performance values
  cpufreq: intel_pstate: Implement the ->adjust_perf() callback
  cpufreq: Add special-purpose fast-switching callback for drivers
  cpufreq: schedutil: Add util to struct sg_cpu
  cppc_cpufreq: replace per-cpu data array with a list
  cppc_cpufreq: expose information on frequency domains
  cppc_cpufreq: clarify support for coordination types
  cppc_cpufreq: use policy->cpu as driver of frequency setting
  ACPI: processor: fix NONE coordination for domain mapping failure
This commit is contained in:
Linus Torvalds 2020-12-22 14:12:10 -08:00
parent 2762db756f c3a74f8e25
commit 4960821a4d
10 changed files with 388 additions and 219 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/ABI/testing/sysfs-devices-system-cpu
View File

@ -264,7 +264,8 @@ Description: Discover CPUs in the same CPU frequency coordination domain
attribute is useful for user space DVFS controllers to get better
power/performance results for platforms using acpi-cpufreq.
This file is only present if the acpi-cpufreq driver is in use.
This file is only present if the acpi-cpufreq or the cppc-cpufreq
drivers are in use.
What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1}

121
drivers/acpi/cppc_acpi.c
View File

@ -414,109 +414,88 @@ static int acpi_get_psd(struct cpc_desc *cpc_ptr, acpi_handle handle)
return result;
}
bool acpi_cpc_valid(void)
{
struct cpc_desc *cpc_ptr;
int cpu;
for_each_possible_cpu(cpu) {
cpc_ptr = per_cpu(cpc_desc_ptr, cpu);
if (!cpc_ptr)
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(acpi_cpc_valid);
/**
* acpi_get_psd_map - Map the CPUs in a common freq domain.
* @all_cpu_data: Ptrs to CPU specific CPPC data including PSD info.
* acpi_get_psd_map - Map the CPUs in the freq domain of a given cpu
* @cpu: Find all CPUs that share a domain with cpu.
* @cpu_data: Pointer to CPU specific CPPC data including PSD info.
*
* Return: 0 for success or negative value for err.
*/
int acpi_get_psd_map(struct cppc_cpudata **all_cpu_data)
int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data)
{
int count_target;
int retval = 0;
unsigned int i, j;
cpumask_var_t covered_cpus;
struct cppc_cpudata *pr, *match_pr;
struct acpi_psd_package *pdomain;
struct acpi_psd_package *match_pdomain;
struct cpc_desc *cpc_ptr, *match_cpc_ptr;
if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
return -ENOMEM;
struct acpi_psd_package *match_pdomain;
struct acpi_psd_package *pdomain;
int count_target, i;
/*
* Now that we have _PSD data from all CPUs, let's setup P-state
* domain info.
*/
for_each_possible_cpu(i) {
if (cpumask_test_cpu(i, covered_cpus))
continue;
pr = all_cpu_data[i];
cpc_ptr = per_cpu(cpc_desc_ptr, i);
if (!cpc_ptr) {
retval = -EFAULT;
goto err_ret;
}
cpc_ptr = per_cpu(cpc_desc_ptr, cpu);
if (!cpc_ptr)
return -EFAULT;
pdomain = &(cpc_ptr->domain_info);
cpumask_set_cpu(i, pr->shared_cpu_map);
cpumask_set_cpu(i, covered_cpus);
cpumask_set_cpu(cpu, cpu_data->shared_cpu_map);
if (pdomain->num_processors <= 1)
continue;
return 0;
/* Validate the Domain info */
count_target = pdomain->num_processors;
if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
pr->shared_type = CPUFREQ_SHARED_TYPE_ALL;
cpu_data->shared_type = CPUFREQ_SHARED_TYPE_ALL;
else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
pr->shared_type = CPUFREQ_SHARED_TYPE_HW;
cpu_data->shared_type = CPUFREQ_SHARED_TYPE_HW;
else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
pr->shared_type = CPUFREQ_SHARED_TYPE_ANY;
cpu_data->shared_type = CPUFREQ_SHARED_TYPE_ANY;
for_each_possible_cpu(j) {
if (i == j)
for_each_possible_cpu(i) {
if (i == cpu)
continue;
match_cpc_ptr = per_cpu(cpc_desc_ptr, j);
if (!match_cpc_ptr) {
retval = -EFAULT;
goto err_ret;
}
match_cpc_ptr = per_cpu(cpc_desc_ptr, i);
if (!match_cpc_ptr)
goto err_fault;
match_pdomain = &(match_cpc_ptr->domain_info);
if (match_pdomain->domain != pdomain->domain)
continue;
/* Here i and j are in the same domain */
if (match_pdomain->num_processors != count_target) {
retval = -EFAULT;
goto err_ret;
/* Here i and cpu are in the same domain */
if (match_pdomain->num_processors != count_target)
goto err_fault;
if (pdomain->coord_type != match_pdomain->coord_type)
goto err_fault;
cpumask_set_cpu(i, cpu_data->shared_cpu_map);
}
if (pdomain->coord_type != match_pdomain->coord_type) {
retval = -EFAULT;
goto err_ret;
}
cpumask_set_cpu(j, covered_cpus);
cpumask_set_cpu(j, pr->shared_cpu_map);
}
for_each_cpu(j, pr->shared_cpu_map) {
if (i == j)
continue;
match_pr = all_cpu_data[j];
match_pr->shared_type = pr->shared_type;
cpumask_copy(match_pr->shared_cpu_map,
pr->shared_cpu_map);
}
}
goto out;
err_ret:
for_each_possible_cpu(i) {
pr = all_cpu_data[i];
return 0;
err_fault:
/* Assume no coordination on any error parsing domain info */
cpumask_clear(pr->shared_cpu_map);
cpumask_set_cpu(i, pr->shared_cpu_map);
pr->shared_type = CPUFREQ_SHARED_TYPE_ALL;
}
out:
free_cpumask_var(covered_cpus);
return retval;
cpumask_clear(cpu_data->shared_cpu_map);
cpumask_set_cpu(cpu, cpu_data->shared_cpu_map);
cpu_data->shared_type = CPUFREQ_SHARED_TYPE_NONE;
return -EFAULT;
}
EXPORT_SYMBOL_GPL(acpi_get_psd_map);

2
drivers/acpi/processor_perflib.c
View File

@ -708,7 +708,7 @@ int acpi_processor_preregister_performance(
if (retval) {
cpumask_clear(pr->performance->shared_cpu_map);
cpumask_set_cpu(i, pr->performance->shared_cpu_map);
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
pr->performance->shared_type = CPUFREQ_SHARED_TYPE_NONE;
}
pr->performance = NULL; /* Will be set for real in register */
}

204
drivers/cpufreq/cppc_cpufreq.c
View File

@ -30,13 +30,13 @@
#define DMI_PROCESSOR_MAX_SPEED 0x14
/*
* These structs contain information parsed from per CPU
* ACPI _CPC structures.
* e.g. For each CPU the highest, lowest supported
* performance capabilities, desired performance level
* requested etc.
* This list contains information parsed from per CPU ACPI _CPC and _PSD
* structures: e.g. the highest and lowest supported performance, capabilities,
* desired performance, level requested etc. Depending on the share_type, not
* all CPUs will have an entry in the list.
*/
static struct cppc_cpudata **all_cpu_data;
static LIST_HEAD(cpu_data_list);
static bool boost_supported;
struct cppc_workaround_oem_info {
@ -148,8 +148,10 @@ static unsigned int cppc_cpufreq_khz_to_perf(struct cppc_cpudata *cpu_data,
static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
struct cppc_cpudata *cpu_data = policy->driver_data;
unsigned int cpu = policy->cpu;
struct cpufreq_freqs freqs;
u32 desired_perf;
int ret = 0;
@ -164,12 +166,12 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
freqs.new = target_freq;
cpufreq_freq_transition_begin(policy, &freqs);
ret = cppc_set_perf(cpu_data->cpu, &cpu_data->perf_ctrls);
ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
cpufreq_freq_transition_end(policy, &freqs, ret != 0);
if (ret)
pr_debug("Failed to set target on CPU:%d. ret:%d\n",
cpu_data->cpu, ret);
cpu, ret);
return ret;
}
@ -182,7 +184,7 @@ static int cppc_verify_policy(struct cpufreq_policy_data *policy)
static void cppc_cpufreq_stop_cpu(struct cpufreq_policy *policy)
{
struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
struct cppc_cpudata *cpu_data = policy->driver_data;
struct cppc_perf_caps *caps = &cpu_data->perf_caps;
unsigned int cpu = policy->cpu;
int ret;
@ -193,6 +195,12 @@ static void cppc_cpufreq_stop_cpu(struct cpufreq_policy *policy)
if (ret)
pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n",
caps->lowest_perf, cpu, ret);
/* Remove CPU node from list and free driver data for policy */
free_cpumask_var(cpu_data->shared_cpu_map);
list_del(&cpu_data->node);
kfree(policy->driver_data);
policy->driver_data = NULL;
}
/*
@ -238,25 +246,61 @@ static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
}
#endif
static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
static struct cppc_cpudata *cppc_cpufreq_get_cpu_data(unsigned int cpu)
{
struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
struct cppc_perf_caps *caps = &cpu_data->perf_caps;
unsigned int cpu = policy->cpu;
int ret = 0;
struct cppc_cpudata *cpu_data;
int ret;
cpu_data->cpu = cpu;
ret = cppc_get_perf_caps(cpu, caps);
cpu_data = kzalloc(sizeof(struct cppc_cpudata), GFP_KERNEL);
if (!cpu_data)
goto out;
if (!zalloc_cpumask_var(&cpu_data->shared_cpu_map, GFP_KERNEL))
goto free_cpu;
ret = acpi_get_psd_map(cpu, cpu_data);
if (ret) {
pr_debug("Err reading CPU%d perf capabilities. ret:%d\n",
cpu, ret);
return ret;
pr_debug("Err parsing CPU%d PSD data: ret:%d\n", cpu, ret);
goto free_mask;
}
ret = cppc_get_perf_caps(cpu, &cpu_data->perf_caps);
if (ret) {
pr_debug("Err reading CPU%d perf caps: ret:%d\n", cpu, ret);
goto free_mask;
}
/* Convert the lowest and nominal freq from MHz to KHz */
caps->lowest_freq *= 1000;
caps->nominal_freq *= 1000;
cpu_data->perf_caps.lowest_freq *= 1000;
cpu_data->perf_caps.nominal_freq *= 1000;
list_add(&cpu_data->node, &cpu_data_list);
return cpu_data;
free_mask:
free_cpumask_var(cpu_data->shared_cpu_map);
free_cpu:
kfree(cpu_data);
out:
return NULL;
}
static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
unsigned int cpu = policy->cpu;
struct cppc_cpudata *cpu_data;
struct cppc_perf_caps *caps;
int ret;
cpu_data = cppc_cpufreq_get_cpu_data(cpu);
if (!cpu_data) {
pr_err("Error in acquiring _CPC/_PSD data for CPU%d.\n", cpu);
return -ENODEV;
}
caps = &cpu_data->perf_caps;
policy->driver_data = cpu_data;
/*
* Set min to lowest nonlinear perf to avoid any efficiency penalty (see
@ -280,26 +324,25 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
policy->transition_delay_us = cppc_cpufreq_get_transition_delay_us(cpu);
policy->shared_type = cpu_data->shared_type;
if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
int i;
switch (policy->shared_type) {
case CPUFREQ_SHARED_TYPE_HW:
case CPUFREQ_SHARED_TYPE_NONE:
/* Nothing to be done - we'll have a policy for each CPU */
break;
case CPUFREQ_SHARED_TYPE_ANY:
/*
* All CPUs in the domain will share a policy and all cpufreq
* operations will use a single cppc_cpudata structure stored
* in policy->driver_data.
*/
cpumask_copy(policy->cpus, cpu_data->shared_cpu_map);
for_each_cpu(i, policy->cpus) {
if (unlikely(i == cpu))
continue;
memcpy(&all_cpu_data[i]->perf_caps, caps,
sizeof(cpu_data->perf_caps));
}
} else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {
/* Support only SW_ANY for now. */
pr_debug("Unsupported CPU co-ord type\n");
break;
default:
pr_debug("Unsupported CPU co-ord type: %d\n",
policy->shared_type);
return -EFAULT;
}
cpu_data->cur_policy = policy;
/*
* If 'highest_perf' is greater than 'nominal_perf', we assume CPU Boost
* is supported.
@ -354,9 +397,12 @@ static int cppc_get_rate_from_fbctrs(struct cppc_cpudata *cpu_data,
static unsigned int cppc_cpufreq_get_rate(unsigned int cpu)
{
struct cppc_perf_fb_ctrs fb_ctrs_t0 = {0}, fb_ctrs_t1 = {0};
struct cppc_cpudata *cpu_data = all_cpu_data[cpu];
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct cppc_cpudata *cpu_data = policy->driver_data;
int ret;
cpufreq_cpu_put(policy);
ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t0);
if (ret)
return ret;
@ -372,7 +418,7 @@ static unsigned int cppc_cpufreq_get_rate(unsigned int cpu)
static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
{
struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
struct cppc_cpudata *cpu_data = policy->driver_data;
struct cppc_perf_caps *caps = &cpu_data->perf_caps;
int ret;
@ -396,6 +442,19 @@ static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
return 0;
}
static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
{
struct cppc_cpudata *cpu_data = policy->driver_data;
return cpufreq_show_cpus(cpu_data->shared_cpu_map, buf);
}
cpufreq_freq_attr_ro(freqdomain_cpus);
static struct freq_attr *cppc_cpufreq_attr[] = {
&freqdomain_cpus,
NULL,
};
static struct cpufreq_driver cppc_cpufreq_driver = {
.flags = CPUFREQ_CONST_LOOPS,
.verify = cppc_verify_policy,
@ -404,6 +463,7 @@ static struct cpufreq_driver cppc_cpufreq_driver = {
.init = cppc_cpufreq_cpu_init,
.stop_cpu = cppc_cpufreq_stop_cpu,
.set_boost = cppc_cpufreq_set_boost,
.attr = cppc_cpufreq_attr,
.name = "cppc_cpufreq",
};
@ -415,10 +475,13 @@ static struct cpufreq_driver cppc_cpufreq_driver = {
*/
static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu)
{
struct cppc_cpudata *cpu_data = all_cpu_data[cpu];
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
struct cppc_cpudata *cpu_data = policy->driver_data;
u64 desired_perf;
int ret;
cpufreq_cpu_put(policy);
ret = cppc_get_desired_perf(cpu, &desired_perf);
if (ret < 0)
return -EIO;
@ -451,68 +514,33 @@ static void cppc_check_hisi_workaround(void)
static int __init cppc_cpufreq_init(void)
{
struct cppc_cpudata *cpu_data;
int i, ret = 0;
if (acpi_disabled)
if ((acpi_disabled) || !acpi_cpc_valid())
return -ENODEV;
all_cpu_data = kcalloc(num_possible_cpus(), sizeof(void *),
GFP_KERNEL);
if (!all_cpu_data)
return -ENOMEM;
for_each_possible_cpu(i) {
all_cpu_data[i] = kzalloc(sizeof(struct cppc_cpudata), GFP_KERNEL);
if (!all_cpu_data[i])
goto out;
cpu_data = all_cpu_data[i];
if (!zalloc_cpumask_var(&cpu_data->shared_cpu_map, GFP_KERNEL))
goto out;
}
ret = acpi_get_psd_map(all_cpu_data);
if (ret) {
pr_debug("Error parsing PSD data. Aborting cpufreq registration.\n");
goto out;
}
INIT_LIST_HEAD(&cpu_data_list);
cppc_check_hisi_workaround();
ret = cpufreq_register_driver(&cppc_cpufreq_driver);
if (ret)
goto out;
return cpufreq_register_driver(&cppc_cpufreq_driver);
}
return ret;
static inline void free_cpu_data(void)
{
struct cppc_cpudata *iter, *tmp;
out:
for_each_possible_cpu(i) {
cpu_data = all_cpu_data[i];
if (!cpu_data)
break;
free_cpumask_var(cpu_data->shared_cpu_map);
kfree(cpu_data);
list_for_each_entry_safe(iter, tmp, &cpu_data_list, node) {
free_cpumask_var(iter->shared_cpu_map);
list_del(&iter->node);
kfree(iter);
}
kfree(all_cpu_data);
return -ENODEV;
}
static void __exit cppc_cpufreq_exit(void)
{
struct cppc_cpudata *cpu_data;
int i;
cpufreq_unregister_driver(&cppc_cpufreq_driver);
for_each_possible_cpu(i) {
cpu_data = all_cpu_data[i];
free_cpumask_var(cpu_data->shared_cpu_map);
kfree(cpu_data);
}
kfree(all_cpu_data);
free_cpu_data();
}
module_exit(cppc_cpufreq_exit);

40
drivers/cpufreq/cpufreq.c
View File

@ -2097,6 +2097,46 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
}
EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch);
/**
* cpufreq_driver_adjust_perf - Adjust CPU performance level in one go.
* @cpu: Target CPU.
* @min_perf: Minimum (required) performance level (units of @capacity).
* @target_perf: Terget (desired) performance level (units of @capacity).
* @capacity: Capacity of the target CPU.
*
* Carry out a fast performance level switch of @cpu without sleeping.
*
* The driver's ->adjust_perf() callback invoked by this function must be
* suitable for being called from within RCU-sched read-side critical sections
* and it is expected to select a suitable performance level equal to or above
* @min_perf and preferably equal to or below @target_perf.
*
* This function must not be called if policy->fast_switch_enabled is unset.
*
* Governors calling this function must guarantee that it will never be invoked
* twice in parallel for the same CPU and that it will never be called in
* parallel with either ->target() or ->target_index() or ->fast_switch() for
* the same CPU.
*/
void cpufreq_driver_adjust_perf(unsigned int cpu,
unsigned long min_perf,
unsigned long target_perf,
unsigned long capacity)
{
cpufreq_driver->adjust_perf(cpu, min_perf, target_perf, capacity);
}
/**
* cpufreq_driver_has_adjust_perf - Check "direct fast switch" callback.
*
* Return 'true' if the ->adjust_perf callback is present for the
* current driver or 'false' otherwise.
*/
bool cpufreq_driver_has_adjust_perf(void)
{
return !!cpufreq_driver->adjust_perf;
}
/* Must set freqs->new to intermediate frequency */
static int __target_intermediate(struct cpufreq_policy *policy,
struct cpufreq_freqs *freqs, int index)

86
drivers/cpufreq/intel_pstate.c
View File

@ -2207,9 +2207,9 @@ static void intel_pstate_update_perf_limits(struct cpudata *cpu,
unsigned int policy_min,
unsigned int policy_max)
{
int max_freq = intel_pstate_get_max_freq(cpu);
int32_t max_policy_perf, min_policy_perf;
int max_state, turbo_max;
int max_freq;
/*
* HWP needs some special consideration, because on BDX the
@ -2223,6 +2223,7 @@ static void intel_pstate_update_perf_limits(struct cpudata *cpu,
cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
turbo_max = cpu->pstate.turbo_pstate;
}
max_freq = max_state * cpu->pstate.scaling;
max_policy_perf = max_state * policy_max / max_freq;
if (policy_max == policy_min) {
@ -2325,9 +2326,18 @@ static void intel_pstate_adjust_policy_max(struct cpudata *cpu,
static void intel_pstate_verify_cpu_policy(struct cpudata *cpu,
struct cpufreq_policy_data *policy)
{
int max_freq;
update_turbo_state();
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
intel_pstate_get_max_freq(cpu));
if (hwp_active) {
int max_state, turbo_max;
intel_pstate_get_hwp_max(cpu->cpu, &turbo_max, &max_state);
max_freq = max_state * cpu->pstate.scaling;
} else {
max_freq = intel_pstate_get_max_freq(cpu);
}
cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, max_freq);
intel_pstate_adjust_policy_max(cpu, policy);
}
@ -2526,20 +2536,19 @@ static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, in
fp_toint(cpu->iowait_boost * 100));
}
static void intel_cpufreq_adjust_hwp(struct cpudata *cpu, u32 target_pstate,
bool strict, bool fast_switch)
static void intel_cpufreq_adjust_hwp(struct cpudata *cpu, u32 min, u32 max,
u32 desired, bool fast_switch)
{
u64 prev = READ_ONCE(cpu->hwp_req_cached), value = prev;
value &= ~HWP_MIN_PERF(~0L);
value |= HWP_MIN_PERF(target_pstate);
value |= HWP_MIN_PERF(min);
/*
* The entire MSR needs to be updated in order to update the HWP min
* field in it, so opportunistically update the max too if needed.
*/
value &= ~HWP_MAX_PERF(~0L);
value |= HWP_MAX_PERF(strict ? target_pstate : cpu->max_perf_ratio);
value |= HWP_MAX_PERF(max);
value &= ~HWP_DESIRED_PERF(~0L);
value |= HWP_DESIRED_PERF(desired);
if (value == prev)
return;
@ -2569,11 +2578,15 @@ static int intel_cpufreq_update_pstate(struct cpufreq_policy *policy,
int old_pstate = cpu->pstate.current_pstate;
target_pstate = intel_pstate_prepare_request(cpu, target_pstate);
if (hwp_active)
intel_cpufreq_adjust_hwp(cpu, target_pstate,
policy->strict_target, fast_switch);
else if (target_pstate != old_pstate)
if (hwp_active) {
int max_pstate = policy->strict_target ?
target_pstate : cpu->max_perf_ratio;
intel_cpufreq_adjust_hwp(cpu, target_pstate, max_pstate, 0,
fast_switch);
} else if (target_pstate != old_pstate) {
intel_cpufreq_adjust_perf_ctl(cpu, target_pstate, fast_switch);
}
cpu->pstate.current_pstate = target_pstate;
@ -2634,6 +2647,47 @@ static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy,
return target_pstate * cpu->pstate.scaling;
}
static void intel_cpufreq_adjust_perf(unsigned int cpunum,
unsigned long min_perf,
unsigned long target_perf,
unsigned long capacity)
{
struct cpudata *cpu = all_cpu_data[cpunum];
int old_pstate = cpu->pstate.current_pstate;
int cap_pstate, min_pstate, max_pstate, target_pstate;
update_turbo_state();
cap_pstate = global.turbo_disabled ? cpu->pstate.max_pstate :
cpu->pstate.turbo_pstate;
/* Optimization: Avoid unnecessary divisions. */
target_pstate = cap_pstate;
if (target_perf < capacity)
target_pstate = DIV_ROUND_UP(cap_pstate * target_perf, capacity);
min_pstate = cap_pstate;
if (min_perf < capacity)
min_pstate = DIV_ROUND_UP(cap_pstate * min_perf, capacity);
if (min_pstate < cpu->pstate.min_pstate)
min_pstate = cpu->pstate.min_pstate;
if (min_pstate < cpu->min_perf_ratio)
min_pstate = cpu->min_perf_ratio;
max_pstate = min(cap_pstate, cpu->max_perf_ratio);
if (max_pstate < min_pstate)
max_pstate = min_pstate;
target_pstate = clamp_t(int, target_pstate, min_pstate, max_pstate);
intel_cpufreq_adjust_hwp(cpu, min_pstate, max_pstate, target_pstate, true);
cpu->pstate.current_pstate = target_pstate;
intel_cpufreq_trace(cpu, INTEL_PSTATE_TRACE_FAST_SWITCH, old_pstate);
}
static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
int max_state, turbo_max, min_freq, max_freq, ret;
@ -3032,6 +3086,8 @@ static int __init intel_pstate_init(void)
intel_pstate.attr = hwp_cpufreq_attrs;
intel_cpufreq.attr = hwp_cpufreq_attrs;
intel_cpufreq.flags |= CPUFREQ_NEED_UPDATE_LIMITS;
intel_cpufreq.fast_switch = NULL;
intel_cpufreq.adjust_perf = intel_cpufreq_adjust_perf;
if (!default_driver)
default_driver = &intel_pstate;

6
include/acpi/cppc_acpi.h
View File

@ -124,11 +124,10 @@ struct cppc_perf_fb_ctrs {
/* Per CPU container for runtime CPPC management. */
struct cppc_cpudata {
int cpu;
struct list_head node;
struct cppc_perf_caps perf_caps;
struct cppc_perf_ctrls perf_ctrls;
struct cppc_perf_fb_ctrs perf_fb_ctrs;
struct cpufreq_policy *cur_policy;
unsigned int shared_type;
cpumask_var_t shared_cpu_map;
};
@ -137,7 +136,8 @@ extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
extern int acpi_get_psd_map(struct cppc_cpudata **);
extern bool acpi_cpc_valid(void);
extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
extern unsigned int cppc_get_transition_latency(int cpu);
extern bool cpc_ffh_supported(void);
extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);

14
include/linux/cpufreq.h
View File

@ -320,6 +320,15 @@ struct cpufreq_driver {
unsigned int index);
unsigned int (*fast_switch)(struct cpufreq_policy *policy,
unsigned int target_freq);
/*
* ->fast_switch() replacement for drivers that use an internal
* representation of performance levels and can pass hints other than
* the target performance level to the hardware.
*/
void (*adjust_perf)(unsigned int cpu,
unsigned long min_perf,
unsigned long target_perf,
unsigned long capacity);
/*
* Caches and returns the lowest driver-supported frequency greater than
@ -588,6 +597,11 @@ struct cpufreq_governor {
/* Pass a target to the cpufreq driver */
unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
unsigned int target_freq);
void cpufreq_driver_adjust_perf(unsigned int cpu,
unsigned long min_perf,
unsigned long target_perf,
unsigned long capacity);
bool cpufreq_driver_has_adjust_perf(void);
int cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation);

5
include/linux/sched/cpufreq.h
View File

@ -28,6 +28,11 @@ static inline unsigned long map_util_freq(unsigned long util,
{
return (freq + (freq >> 2)) * util / cap;
}
static inline unsigned long map_util_perf(unsigned long util)
{
return util + (util >> 2);
}
#endif /* CONFIG_CPU_FREQ */
#endif /* _LINUX_SCHED_CPUFREQ_H */

106
kernel/sched/cpufreq_schedutil.c
View File

@ -53,6 +53,7 @@ struct sugov_cpu {
unsigned int iowait_boost;
u64 last_update;
unsigned long util;
unsigned long bw_dl;
unsigned long max;
@ -276,16 +277,15 @@ unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs,
return min(max, util);
}
static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
static void sugov_get_util(struct sugov_cpu *sg_cpu)
{
struct rq *rq = cpu_rq(sg_cpu->cpu);
unsigned long util = cpu_util_cfs(rq);
unsigned long max = arch_scale_cpu_capacity(sg_cpu->cpu);
sg_cpu->max = max;
sg_cpu->bw_dl = cpu_bw_dl(rq);
return schedutil_cpu_util(sg_cpu->cpu, util, max, FREQUENCY_UTIL, NULL);
sg_cpu->util = schedutil_cpu_util(sg_cpu->cpu, cpu_util_cfs(rq), max,
FREQUENCY_UTIL, NULL);
}
/**
@ -362,8 +362,6 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,
* sugov_iowait_apply() - Apply the IO boost to a CPU.
* @sg_cpu: the sugov data for the cpu to boost
* @time: the update time from the caller
* @util: the utilization to (eventually) boost
* @max: the maximum value the utilization can be boosted to
*
* A CPU running a task which woken up after an IO operation can have its
* utilization boosted to speed up the completion of those IO operations.
@ -377,18 +375,17 @@ static void sugov_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,
* This mechanism is designed to boost high frequently IO waiting tasks, while
* being more conservative on tasks which does sporadic IO operations.
*/
static unsigned long sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time,
unsigned long util, unsigned long max)
static void sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time)
{
unsigned long boost;
/* No boost currently required */
if (!sg_cpu->iowait_boost)
return util;
return;
/* Reset boost if the CPU appears to have been idle enough */
if (sugov_iowait_reset(sg_cpu, time, false))
return util;
return;
if (!sg_cpu->iowait_boost_pending) {
/*
@ -397,18 +394,19 @@ static unsigned long sugov_iowait_apply(struct sugov_cpu *sg_cpu, u64 time,
sg_cpu->iowait_boost >>= 1;
if (sg_cpu->iowait_boost < IOWAIT_BOOST_MIN) {
sg_cpu->iowait_boost = 0;
return util;
return;
}
}
sg_cpu->iowait_boost_pending = false;
/*
* @util is already in capacity scale; convert iowait_boost
* sg_cpu->util is already in capacity scale; convert iowait_boost
* into the same scale so we can compare.
*/
boost = (sg_cpu->iowait_boost * max) >> SCHED_CAPACITY_SHIFT;
return max(boost, util);
boost = (sg_cpu->iowait_boost * sg_cpu->max) >> SCHED_CAPACITY_SHIFT;
if (sg_cpu->util < boost)
sg_cpu->util = boost;
}
#ifdef CONFIG_NO_HZ_COMMON
@ -434,14 +432,10 @@ static inline void ignore_dl_rate_limit(struct sugov_cpu *sg_cpu, struct sugov_p
sg_policy->limits_changed = true;
}
static void sugov_update_single(struct update_util_data *hook, u64 time,
unsigned int flags)
static inline bool sugov_update_single_common(struct sugov_cpu *sg_cpu,
u64 time, unsigned int flags)
{
struct sugov_cpu *sg_cpu = container_of(hook, struct sugov_cpu, update_util);
struct sugov_policy *sg_policy = sg_cpu->sg_policy;
unsigned long util, max;
unsigned int next_f;
unsigned int cached_freq = sg_policy->cached_raw_freq;
sugov_iowait_boost(sg_cpu, time, flags);
sg_cpu->last_update = time;
@ -449,12 +443,26 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
ignore_dl_rate_limit(sg_cpu, sg_policy);
if (!sugov_should_update_freq(sg_policy, time))
return false;
sugov_get_util(sg_cpu);
sugov_iowait_apply(sg_cpu, time);
return true;
}
static void sugov_update_single_freq(struct update_util_data *hook, u64 time,
unsigned int flags)
{
struct sugov_cpu *sg_cpu = container_of(hook, struct sugov_cpu, update_util);
struct sugov_policy *sg_policy = sg_cpu->sg_policy;
unsigned int cached_freq = sg_policy->cached_raw_freq;
unsigned int next_f;
if (!sugov_update_single_common(sg_cpu, time, flags))
return;
util = sugov_get_util(sg_cpu);
max = sg_cpu->max;
util = sugov_iowait_apply(sg_cpu, time, util, max);
next_f = get_next_freq(sg_policy, util, max);
next_f = get_next_freq(sg_policy, sg_cpu->util, sg_cpu->max);
/*
* Do not reduce the frequency if the CPU has not been idle
* recently, as the reduction is likely to be premature then.
@ -480,6 +488,38 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
}
}
static void sugov_update_single_perf(struct update_util_data *hook, u64 time,
unsigned int flags)
{
struct sugov_cpu *sg_cpu = container_of(hook, struct sugov_cpu, update_util);
unsigned long prev_util = sg_cpu->util;
/*
* Fall back to the "frequency" path if frequency invariance is not
* supported, because the direct mapping between the utilization and
* the performance levels depends on the frequency invariance.
*/
if (!arch_scale_freq_invariant()) {
sugov_update_single_freq(hook, time, flags);
return;
}
if (!sugov_update_single_common(sg_cpu, time, flags))
return;
/*
* Do not reduce the target performance level if the CPU has not been
* idle recently, as the reduction is likely to be premature then.
*/
if (sugov_cpu_is_busy(sg_cpu) && sg_cpu->util < prev_util)
sg_cpu->util = prev_util;
cpufreq_driver_adjust_perf(sg_cpu->cpu, map_util_perf(sg_cpu->bw_dl),
map_util_perf(sg_cpu->util), sg_cpu->max);
sg_cpu->sg_policy->last_freq_update_time = time;
}
static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
{
struct sugov_policy *sg_policy = sg_cpu->sg_policy;
@ -491,9 +531,10 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
struct sugov_cpu *j_sg_cpu = &per_cpu(sugov_cpu, j);
unsigned long j_util, j_max;
j_util = sugov_get_util(j_sg_cpu);
sugov_get_util(j_sg_cpu);
sugov_iowait_apply(j_sg_cpu, time);
j_util = j_sg_cpu->util;
j_max = j_sg_cpu->max;
j_util = sugov_iowait_apply(j_sg_cpu, time, j_util, j_max);
if (j_util * max > j_max * util) {
util = j_util;
@ -817,6 +858,7 @@ static void sugov_exit(struct cpufreq_policy *policy)
static int sugov_start(struct cpufreq_policy *policy)
{
struct sugov_policy *sg_policy = policy->governor_data;
void (*uu)(struct update_util_data *data, u64 time, unsigned int flags);
unsigned int cpu;
sg_policy->freq_update_delay_ns = sg_policy->tunables->rate_limit_us * NSEC_PER_USEC;
@ -836,13 +878,17 @@ static int sugov_start(struct cpufreq_policy *policy)
sg_cpu->sg_policy = sg_policy;
}
if (policy_is_shared(policy))
uu = sugov_update_shared;
else if (policy->fast_switch_enabled && cpufreq_driver_has_adjust_perf())
uu = sugov_update_single_perf;
else
uu = sugov_update_single_freq;
for_each_cpu(cpu, policy->cpus) {
struct sugov_cpu *sg_cpu = &per_cpu(sugov_cpu, cpu);
cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util,
policy_is_shared(policy) ?
sugov_update_shared :
sugov_update_single);
cpufreq_add_update_util_hook(cpu, &sg_cpu->update_util, uu);
}
return 0;
}