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cpufreq/cppc: Move and rename cppc_cpufreq_{perf_to_khz|khz_to_perf}()

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Move and rename cppc_cpufreq_perf_to_khz() and cppc_cpufreq_khz_to_perf() to
use them outside cppc_cpufreq in topology_init_cpu_capacity_cppc().

Modify the interface to use struct cppc_perf_caps *caps instead of
struct cppc_cpudata *cpu_data as we only use the fields of cppc_perf_caps.

cppc_cpufreq was converting the lowest and nominal freq from MHz to kHz
before using them. We move this conversion inside cppc_perf_to_khz and
cppc_khz_to_perf to make them generic and usable outside cppc_cpufreq.

No functional change

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Pierre Gondois <pierre.gondois@arm.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20231211104855.558096-6-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2023-12-11 11:48:53 +01:00 committed by Ingo Molnar
parent 15cbbd1d31
commit 50b813b147
3 changed files with 123 additions and 122 deletions
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104
drivers/acpi/cppc_acpi.c
View file

@ -39,6 +39,9 @@
#include <linux/rwsem.h>
#include <linux/wait.h>
#include <linux/topology.h>
#include <linux/dmi.h>
#include <linux/units.h>
#include <asm/unaligned.h>
#include <acpi/cppc_acpi.h>
@ -1760,3 +1763,104 @@ unsigned int cppc_get_transition_latency(int cpu_num)
return latency_ns;
}
EXPORT_SYMBOL_GPL(cppc_get_transition_latency);
/* Minimum struct length needed for the DMI processor entry we want */
#define DMI_ENTRY_PROCESSOR_MIN_LENGTH 48
/* Offset in the DMI processor structure for the max frequency */
#define DMI_PROCESSOR_MAX_SPEED 0x14
/* Callback function used to retrieve the max frequency from DMI */
static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)
{
const u8 *dmi_data = (const u8 *)dm;
u16 *mhz = (u16 *)private;
if (dm->type == DMI_ENTRY_PROCESSOR &&
dm->length >= DMI_ENTRY_PROCESSOR_MIN_LENGTH) {
u16 val = (u16)get_unaligned((const u16 *)
(dmi_data + DMI_PROCESSOR_MAX_SPEED));
*mhz = val > *mhz ? val : *mhz;
}
}
/* Look up the max frequency in DMI */
static u64 cppc_get_dmi_max_khz(void)
{
u16 mhz = 0;
dmi_walk(cppc_find_dmi_mhz, &mhz);
/*
* Real stupid fallback value, just in case there is no
* actual value set.
*/
mhz = mhz ? mhz : 1;
return KHZ_PER_MHZ * mhz;
}
/*
* If CPPC lowest_freq and nominal_freq registers are exposed then we can
* use them to convert perf to freq and vice versa. The conversion is
* extrapolated as an affine function passing by the 2 points:
* - (Low perf, Low freq)
* - (Nominal perf, Nominal freq)
*/
unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf)
{
s64 retval, offset = 0;
static u64 max_khz;
u64 mul, div;
if (caps->lowest_freq && caps->nominal_freq) {
mul = caps->nominal_freq - caps->lowest_freq;
mul *= KHZ_PER_MHZ;
div = caps->nominal_perf - caps->lowest_perf;
offset = caps->nominal_freq * KHZ_PER_MHZ -
div64_u64(caps->nominal_perf * mul, div);
} else {
if (!max_khz)
max_khz = cppc_get_dmi_max_khz();
mul = max_khz;
div = caps->highest_perf;
}
retval = offset + div64_u64(perf * mul, div);
if (retval >= 0)
return retval;
return 0;
}
EXPORT_SYMBOL_GPL(cppc_perf_to_khz);
unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq)
{
s64 retval, offset = 0;
static u64 max_khz;
u64 mul, div;
if (caps->lowest_freq && caps->nominal_freq) {
mul = caps->nominal_perf - caps->lowest_perf;
div = caps->nominal_freq - caps->lowest_freq;
/*
* We don't need to convert to kHz for computing offset and can
* directly use nominal_freq and lowest_freq as the div64_u64
* will remove the frequency unit.
*/
offset = caps->nominal_perf -
div64_u64(caps->nominal_freq * mul, div);
/* But we need it for computing the perf level. */
div *= KHZ_PER_MHZ;
} else {
if (!max_khz)
max_khz = cppc_get_dmi_max_khz();
mul = caps->highest_perf;
div = max_khz;
}
retval = offset + div64_u64(freq * mul, div);
if (retval >= 0)
return retval;
return 0;
}
EXPORT_SYMBOL_GPL(cppc_khz_to_perf);

139
drivers/cpufreq/cppc_cpufreq.c
View file

@ -16,7 +16,6 @@
#include <linux/delay.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/dmi.h>
#include <linux/irq_work.h>
#include <linux/kthread.h>
#include <linux/time.h>
@ -27,12 +26,6 @@
#include <acpi/cppc_acpi.h>
/* Minimum struct length needed for the DMI processor entry we want */
#define DMI_ENTRY_PROCESSOR_MIN_LENGTH 48
/* Offset in the DMI processor structure for the max frequency */
#define DMI_PROCESSOR_MAX_SPEED 0x14
/*
* This list contains information parsed from per CPU ACPI _CPC and _PSD
* structures: e.g. the highest and lowest supported performance, capabilities,
@ -291,97 +284,9 @@ static inline void cppc_freq_invariance_exit(void)
}
#endif /* CONFIG_ACPI_CPPC_CPUFREQ_FIE */
/* Callback function used to retrieve the max frequency from DMI */
static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)
{
const u8 *dmi_data = (const u8 *)dm;
u16 *mhz = (u16 *)private;
if (dm->type == DMI_ENTRY_PROCESSOR &&
dm->length >= DMI_ENTRY_PROCESSOR_MIN_LENGTH) {
u16 val = (u16)get_unaligned((const u16 *)
(dmi_data + DMI_PROCESSOR_MAX_SPEED));
*mhz = val > *mhz ? val : *mhz;
}
}
/* Look up the max frequency in DMI */
static u64 cppc_get_dmi_max_khz(void)
{
u16 mhz = 0;
dmi_walk(cppc_find_dmi_mhz, &mhz);
/*
* Real stupid fallback value, just in case there is no
* actual value set.
*/
mhz = mhz ? mhz : 1;
return (1000 * mhz);
}
/*
* If CPPC lowest_freq and nominal_freq registers are exposed then we can
* use them to convert perf to freq and vice versa. The conversion is
* extrapolated as an affine function passing by the 2 points:
* - (Low perf, Low freq)
* - (Nominal perf, Nominal perf)
*/
static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu_data,
unsigned int perf)
{
struct cppc_perf_caps *caps = &cpu_data->perf_caps;
s64 retval, offset = 0;
static u64 max_khz;
u64 mul, div;
if (caps->lowest_freq && caps->nominal_freq) {
mul = caps->nominal_freq - caps->lowest_freq;
div = caps->nominal_perf - caps->lowest_perf;
offset = caps->nominal_freq - div64_u64(caps->nominal_perf * mul, div);
} else {
if (!max_khz)
max_khz = cppc_get_dmi_max_khz();
mul = max_khz;
div = caps->highest_perf;
}
retval = offset + div64_u64(perf * mul, div);
if (retval >= 0)
return retval;
return 0;
}
static unsigned int cppc_cpufreq_khz_to_perf(struct cppc_cpudata *cpu_data,
unsigned int freq)
{
struct cppc_perf_caps *caps = &cpu_data->perf_caps;
s64 retval, offset = 0;
static u64 max_khz;
u64 mul, div;
if (caps->lowest_freq && caps->nominal_freq) {
mul = caps->nominal_perf - caps->lowest_perf;
div = caps->nominal_freq - caps->lowest_freq;
offset = caps->nominal_perf - div64_u64(caps->nominal_freq * mul, div);
} else {
if (!max_khz)
max_khz = cppc_get_dmi_max_khz();
mul = caps->highest_perf;
div = max_khz;
}
retval = offset + div64_u64(freq * mul, div);
if (retval >= 0)
return retval;
return 0;
}
static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
struct cppc_cpudata *cpu_data = policy->driver_data;
unsigned int cpu = policy->cpu;
@ -389,7 +294,7 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
u32 desired_perf;
int ret = 0;
desired_perf = cppc_cpufreq_khz_to_perf(cpu_data, target_freq);
desired_perf = cppc_khz_to_perf(&cpu_data->perf_caps, target_freq);
/* Return if it is exactly the same perf */
if (desired_perf == cpu_data->perf_ctrls.desired_perf)
return ret;
@ -417,7 +322,7 @@ static unsigned int cppc_cpufreq_fast_switch(struct cpufreq_policy *policy,
u32 desired_perf;
int ret;
desired_perf = cppc_cpufreq_khz_to_perf(cpu_data, target_freq);
desired_perf = cppc_khz_to_perf(&cpu_data->perf_caps, target_freq);
cpu_data->perf_ctrls.desired_perf = desired_perf;
ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
@ -530,7 +435,7 @@ static int cppc_get_cpu_power(struct device *cpu_dev,
min_step = min_cap / CPPC_EM_CAP_STEP;
max_step = max_cap / CPPC_EM_CAP_STEP;
perf_prev = cppc_cpufreq_khz_to_perf(cpu_data, *KHz);
perf_prev = cppc_khz_to_perf(perf_caps, *KHz);
step = perf_prev / perf_step;
if (step > max_step)
@ -550,8 +455,8 @@ static int cppc_get_cpu_power(struct device *cpu_dev,
perf = step * perf_step;
}
*KHz = cppc_cpufreq_perf_to_khz(cpu_data, perf);
perf_check = cppc_cpufreq_khz_to_perf(cpu_data, *KHz);
*KHz = cppc_perf_to_khz(perf_caps, perf);
perf_check = cppc_khz_to_perf(perf_caps, *KHz);
step_check = perf_check / perf_step;
/*
@ -561,8 +466,8 @@ static int cppc_get_cpu_power(struct device *cpu_dev,
*/
while ((*KHz == prev_freq) || (step_check != step)) {
perf++;
*KHz = cppc_cpufreq_perf_to_khz(cpu_data, perf);
perf_check = cppc_cpufreq_khz_to_perf(cpu_data, *KHz);
*KHz = cppc_perf_to_khz(perf_caps, perf);
perf_check = cppc_khz_to_perf(perf_caps, *KHz);
step_check = perf_check / perf_step;
}
@ -591,7 +496,7 @@ static int cppc_get_cpu_cost(struct device *cpu_dev, unsigned long KHz,
perf_caps = &cpu_data->perf_caps;
max_cap = arch_scale_cpu_capacity(cpu_dev->id);
perf_prev = cppc_cpufreq_khz_to_perf(cpu_data, KHz);
perf_prev = cppc_khz_to_perf(perf_caps, KHz);
perf_step = CPPC_EM_CAP_STEP * perf_caps->highest_perf / max_cap;
step = perf_prev / perf_step;
@ -679,10 +584,6 @@ static struct cppc_cpudata *cppc_cpufreq_get_cpu_data(unsigned int cpu)
goto free_mask;
}
/* Convert the lowest and nominal freq from MHz to KHz */
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;
@ -724,20 +625,16 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
* Set min to lowest nonlinear perf to avoid any efficiency penalty (see
* Section 8.4.7.1.1.5 of ACPI 6.1 spec)
*/
policy->min = cppc_cpufreq_perf_to_khz(cpu_data,
caps->lowest_nonlinear_perf);
policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
caps->nominal_perf);
policy->min = cppc_perf_to_khz(caps, caps->lowest_nonlinear_perf);
policy->max = cppc_perf_to_khz(caps, caps->nominal_perf);
/*
* Set cpuinfo.min_freq to Lowest to make the full range of performance
* available if userspace wants to use any perf between lowest & lowest
* nonlinear perf
*/
policy->cpuinfo.min_freq = cppc_cpufreq_perf_to_khz(cpu_data,
caps->lowest_perf);
policy->cpuinfo.max_freq = cppc_cpufreq_perf_to_khz(cpu_data,
caps->nominal_perf);
policy->cpuinfo.min_freq = cppc_perf_to_khz(caps, caps->lowest_perf);
policy->cpuinfo.max_freq = cppc_perf_to_khz(caps, caps->nominal_perf);
policy->transition_delay_us = cppc_cpufreq_get_transition_delay_us(cpu);
policy->shared_type = cpu_data->shared_type;
@ -773,7 +670,7 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
boost_supported = true;
/* Set policy->cur to max now. The governors will adjust later. */
policy->cur = cppc_cpufreq_perf_to_khz(cpu_data, caps->highest_perf);
policy->cur = cppc_perf_to_khz(caps, caps->highest_perf);
cpu_data->perf_ctrls.desired_perf = caps->highest_perf;
ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
@ -863,7 +760,7 @@ static unsigned int cppc_cpufreq_get_rate(unsigned int cpu)
delivered_perf = cppc_perf_from_fbctrs(cpu_data, &fb_ctrs_t0,
&fb_ctrs_t1);
return cppc_cpufreq_perf_to_khz(cpu_data, delivered_perf);
return cppc_perf_to_khz(&cpu_data->perf_caps, delivered_perf);
}
static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
@ -878,11 +775,9 @@ static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
}
if (state)
policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
caps->highest_perf);
policy->max = cppc_perf_to_khz(caps, caps->highest_perf);
else
policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
caps->nominal_perf);
policy->max = cppc_perf_to_khz(caps, caps->nominal_perf);
policy->cpuinfo.max_freq = policy->max;
ret = freq_qos_update_request(policy->max_freq_req, policy->max);
@ -937,7 +832,7 @@ static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu)
if (ret < 0)
return -EIO;
return cppc_cpufreq_perf_to_khz(cpu_data, desired_perf);
return cppc_perf_to_khz(&cpu_data->perf_caps, desired_perf);
}
static void cppc_check_hisi_workaround(void)

2
include/acpi/cppc_acpi.h
View file

@ -144,6 +144,8 @@ extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
extern int cppc_set_enable(int cpu, bool enable);
extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
extern bool cppc_perf_ctrs_in_pcc(void);
extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf);
extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq);
extern bool acpi_cpc_valid(void);
extern bool cppc_allow_fast_switch(void);
extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);