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hwmon: (fam15h_power) Add compute unit accumulated power 

This patch adds a member in fam15h_power_data which specifies the
compute unit accumulated power. It adds do_read_registers_on_cu to do
all the read to all MSRs and run it on one of the online cores on each
compute unit with smp_call_function_many(). This behavior can decrease
IPI numbers.

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.1
Huang Rui 2016-04-06 15:44:11 +08:00 committed by Guenter Roeck
parent 3ba4e38415
commit fa79434499
1 changed files with 71 additions and 1 deletions
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72
drivers/hwmon/fam15h_power.c
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@ -25,6 +25,8 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <asm/processor.h>
#include <asm/msr.h>
@ -44,7 +46,9 @@ MODULE_LICENSE("GPL");
#define FAM15H_MIN_NUM_ATTRS 2
#define FAM15H_NUM_GROUPS 2
#define MAX_CUS 8
#define MSR_F15H_CU_PWR_ACCUMULATOR 0xc001007a
#define MSR_F15H_CU_MAX_PWR_ACCUMULATOR 0xc001007b
#define PCI_DEVICE_ID_AMD_15H_M70H_NB_F4 0x15b4
@ -59,6 +63,8 @@ struct fam15h_power_data {
struct attribute_group group;
/* maximum accumulated power of a compute unit */
u64 max_cu_acc_power;
/* accumulated power of the compute units */
u64 cu_acc_power[MAX_CUS];
};
static ssize_t show_power(struct device *dev,
@ -125,6 +131,70 @@ static ssize_t show_power_crit(struct device *dev,
}
static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
static void do_read_registers_on_cu(void *_data)
{
struct fam15h_power_data *data = _data;
int cpu, cu;
cpu = smp_processor_id();
/*
* With the new x86 topology modelling, cpu core id actually
* is compute unit id.
*/
cu = cpu_data(cpu).cpu_core_id;
rdmsrl_safe(MSR_F15H_CU_PWR_ACCUMULATOR, &data->cu_acc_power[cu]);
}
/*
* This function is only able to be called when CPUID
* Fn8000_0007:EDX[12] is set.
*/
static int read_registers(struct fam15h_power_data *data)
{
int this_cpu, ret, cpu;
int core, this_core;
cpumask_var_t mask;
ret = zalloc_cpumask_var(&mask, GFP_KERNEL);
if (!ret)
return -ENOMEM;
get_online_cpus();
this_cpu = smp_processor_id();
/*
* Choose the first online core of each compute unit, and then
* read their MSR value of power and ptsc in a single IPI,
* because the MSR value of CPU core represent the compute
* unit's.
*/
core = -1;
for_each_online_cpu(cpu) {
this_core = topology_core_id(cpu);
if (this_core == core)
continue;
core = this_core;
/* get any CPU on this compute unit */
cpumask_set_cpu(cpumask_any(topology_sibling_cpumask(cpu)), mask);
}
if (cpumask_test_cpu(this_cpu, mask))
do_read_registers_on_cu(data);
smp_call_function_many(mask, do_read_registers_on_cu, data, true);
put_online_cpus();
free_cpumask_var(mask);
return 0;
}
static int fam15h_power_init_attrs(struct pci_dev *pdev,
struct fam15h_power_data *data)
{
@ -263,7 +333,7 @@ static int fam15h_power_init_data(struct pci_dev *f4,
data->max_cu_acc_power = tmp;
return 0;
return read_registers(data);
}
static int fam15h_power_probe(struct pci_dev *pdev,