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gpu: nvgpu: capture stats for pci gpu power off/on

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Use a debugfs node to export statistics of dgpu power on
and power off events. The stats capture number of
powerons and pwoeroffs, min/max/avg poweron and poweroff
latency.

JIRA NVGPU-1100

Change-Id: I7d8f9d6a5102478ec179d77f7072185ad32dda9b
Signed-off-by: Nitin Kumbhar <nkumbhar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1833306
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Nitin Kumbhar
2018-09-19 23:25:57 +05:30
committed by Abdul Salam
parent 237af3ef86
commit 8c7b542810
1 changed files with 124 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

124
drivers/gpu/nvgpu/os/linux/pci_power.c
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@@ -20,6 +20,8 @@
#include <linux/platform_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/ktime.h>
#include <linux/debugfs.h>
#include <nvgpu/lock.h>
@@ -29,6 +31,19 @@
#define PCI_DEV_NAME_MAX 64
struct pci_power_stats {
u64 power_ons;
s64 power_on_lat_ns_min;
s64 power_on_lat_ns_max;
s64 power_on_lat_ns_avg;
u64 power_offs;
s64 power_off_lat_ns_min;
s64 power_off_lat_ns_max;
s64 power_off_lat_ns_avg;
};
static struct dentry *pci_power_stats_dbgfs_dentry;
struct nvgpu_pci_power {
struct list_head list;
struct nvgpu_mutex mutex;
@@ -36,6 +51,7 @@ struct nvgpu_pci_power {
struct pci_dev *pci_dev;
char pci_dev_name[PCI_DEV_NAME_MAX];
void *pci_cookie;
struct pci_power_stats stats;
};
static struct list_head nvgpu_pci_power_devs =
@@ -262,6 +278,87 @@ static int nvgpu_assert_pci_pwr_on(struct nvgpu_pci_gpios *pgpios)
return 0;
}
static void nvgpu_update_power_on_stats(struct nvgpu_pci_power *pp, s64 time_ns)
{
struct pci_power_stats *stats = &pp->stats;
stats->power_ons++;
if (unlikely(stats->power_on_lat_ns_min == 0)) {
stats->power_on_lat_ns_min = time_ns;
stats->power_on_lat_ns_max = time_ns;
stats->power_on_lat_ns_avg = time_ns;
return;
}
if (time_ns < stats->power_on_lat_ns_min)
stats->power_on_lat_ns_min = time_ns;
if (time_ns > stats->power_on_lat_ns_max)
stats->power_on_lat_ns_max = time_ns;
stats->power_on_lat_ns_avg =
(stats->power_on_lat_ns_avg + time_ns) >> 1;
}
static void nvgpu_update_power_off_stats(struct nvgpu_pci_power *pp,
s64 time_ns)
{
struct pci_power_stats *stats = &pp->stats;
stats->power_offs++;
if (unlikely(stats->power_off_lat_ns_min == 0)) {
stats->power_off_lat_ns_min = time_ns;
stats->power_off_lat_ns_max = time_ns;
stats->power_off_lat_ns_avg = time_ns;
return;
}
if (time_ns < stats->power_off_lat_ns_min)
stats->power_off_lat_ns_min = time_ns;
if (time_ns > stats->power_off_lat_ns_max)
stats->power_off_lat_ns_max = time_ns;
stats->power_off_lat_ns_avg =
(stats->power_off_lat_ns_avg + time_ns) >> 1;
}
#define DBG_POWER_STAT_SEQ_PRINTF(s, stat) \
seq_printf(s, "%20s:%15lld\n", #stat, pp->stats.stat)
static int debugfs_pci_power_stats_show(struct seq_file *s, void *unused)
{
struct nvgpu_pci_power *pp, *tmp_pp;
list_for_each_entry_safe(pp, tmp_pp, &nvgpu_pci_power_devs, list) {
seq_printf(s, "PCI GPU (%s) Power Stats:\n", pp->pci_dev_name);
DBG_POWER_STAT_SEQ_PRINTF(s, power_ons);
DBG_POWER_STAT_SEQ_PRINTF(s, power_on_lat_ns_min);
DBG_POWER_STAT_SEQ_PRINTF(s, power_on_lat_ns_max);
DBG_POWER_STAT_SEQ_PRINTF(s, power_on_lat_ns_avg);
DBG_POWER_STAT_SEQ_PRINTF(s, power_offs);
DBG_POWER_STAT_SEQ_PRINTF(s, power_off_lat_ns_min);
DBG_POWER_STAT_SEQ_PRINTF(s, power_off_lat_ns_max);
DBG_POWER_STAT_SEQ_PRINTF(s, power_off_lat_ns_avg);
}
return 0;
}
static int debugfs_pci_power_stats_open(struct inode *i, struct file *f)
{
return single_open(f, debugfs_pci_power_stats_show, &i->i_private);
}
static const struct file_operations debug_power_stats_fops = {
.open = debugfs_pci_power_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#if !IS_ENABLED(CONFIG_PCIE_TEGRA_DW) || \
!IS_ENABLED(CONFIG_ARCH_TEGRA_19x_SOC) || \
LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)
@@ -317,6 +414,8 @@ static int nvgpu_pci_gpu_power_on(char *dev_name)
{
struct nvgpu_pci_power *pp;
struct nvgpu_pci_gpios *pgpios;
ktime_t time_start;
s64 time_ns;
int ret;
pp = nvgpu_pci_get_pci_power(dev_name);
@@ -325,6 +424,8 @@ static int nvgpu_pci_gpu_power_on(char *dev_name)
return -ENODEV;
}
time_start = ktime_get();
nvgpu_mutex_acquire(&pp->mutex);
pgpios = &pp->gpios;
@@ -362,6 +463,9 @@ static int nvgpu_pci_gpu_power_on(char *dev_name)
nvgpu_dump_pci_gpios(pgpios, __func__);
nvgpu_mutex_release(&pp->mutex);
time_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
nvgpu_update_power_on_stats(pp, time_ns);
return 0;
out:
nvgpu_mutex_release(&pp->mutex);
@@ -374,6 +478,8 @@ static int nvgpu_pci_gpu_power_off(char *dev_name)
struct nvgpu_pci_gpios *pgpios;
struct device *dev;
struct gk20a *g;
ktime_t time_start;
s64 time_ns;
int ret;
pp = nvgpu_pci_get_pci_power(dev_name);
@@ -382,6 +488,8 @@ static int nvgpu_pci_gpu_power_off(char *dev_name)
return -ENODEV;
}
time_start = ktime_get();
nvgpu_mutex_acquire(&pp->mutex);
dev = &pp->pci_dev->dev;
@@ -427,6 +535,9 @@ static int nvgpu_pci_gpu_power_off(char *dev_name)
nvgpu_dump_pci_gpios(pgpios, __func__);
nvgpu_mutex_release(&pp->mutex);
time_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
nvgpu_update_power_off_stats(pp, time_ns);
return 0;
out:
nvgpu_mutex_release(&pp->mutex);
@@ -458,14 +569,25 @@ int nvgpu_pci_set_powerstate(char *dev_name, int powerstate)
int __init nvgpu_pci_power_init(struct pci_driver *nvgpu_pci_driver)
{
struct device_driver *driver = &nvgpu_pci_driver->driver;
struct dentry *d;
int ret;
ret = driver_create_file(driver, &driver_attr_probed_gpus);
if (ret)
goto err_probed_gpus;
d = debugfs_create_file("tegra_nvgpu_pci_power_stats", 0400,
NULL, NULL, &debug_power_stats_fops);
if (!d) {
ret = -ENOENT;
goto err_power_stats;
}
pci_power_stats_dbgfs_dentry = d;
return 0;
err_power_stats:
driver_remove_file(driver, &driver_attr_probed_gpus);
err_probed_gpus:
return ret;
}
@@ -474,6 +596,8 @@ void __exit nvgpu_pci_power_exit(struct pci_driver *nvgpu_pci_driver)
{
struct device_driver *driver = &nvgpu_pci_driver->driver;
debugfs_remove(pci_power_stats_dbgfs_dentry);
driver_remove_file(driver, &driver_attr_probed_gpus);
}