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gpu: nvgpu: add nvgpu power off/on sysfs nodes

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Add sysfs nodes to manage power of dGPU. Writing
pci dev name to poweroff/poweron sysfs node powers
off/on dGPU.

The format of pci dev name is DDDD:BB:DD.F i.e.
domain:bus:device.function

echo 0001:01:00.0 > /sys/bus/pci/drivers/nvgpu/poweroff
echo 0001:01:00.0 > /sys/bus/pci/drivers/nvgpu/poweron

The permissions of nodes are set such that only root
user can write to the sysfs node to control dGPU power
state.

JIRA NVGPU-1100

Change-Id: I904881cab58c5f553e94510a3a10000194238433
Signed-off-by: Nitin Kumbhar <nkumbhar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1749848
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 22:31:45 +05:30
committed by Abdul Salam
parent 8c7b542810
commit ff3cafa134
1 changed files with 85 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
drivers/gpu/nvgpu/os/linux/pci_power.c
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@@ -133,6 +133,22 @@ int nvgpu_pci_clear_pci_power(const char *dev_name)
return -ENODEV;
}
static int nvgpu_pci_parse_dev_name(const char *buf, size_t count, char *name)
{
int domain, bus, device, func;
int ret;
/* DDDD:BB:DD.F for domain:bus:device.function */
ret = sscanf(buf, "%x:%x:%x.%x", &domain, &bus, &device, &func);
if (ret < 4)
return -EINVAL;
snprintf(name, PCI_DEV_NAME_MAX, "%04x:%02x:%02x.%1x",
domain, bus, device, func);
return 0;
}
static char *nvgpu_pci_gpio_name(int g)
{
switch (g) {
@@ -565,6 +581,59 @@ int nvgpu_pci_set_powerstate(char *dev_name, int powerstate)
return ret;
}
static ssize_t poweroff_store(struct device_driver *drv,
const char *buf, size_t count)
{
struct nvgpu_pci_power *pp;
char dev_name[PCI_DEV_NAME_MAX];
int ret;
ret = nvgpu_pci_parse_dev_name(buf, count, dev_name);
if (ret)
return ret;
pp = nvgpu_pci_get_pci_power(dev_name);
if (!pp)
return -ENODEV;
ret = nvgpu_pci_set_powerstate(dev_name, NVGPU_POWER_OFF);
if (ret) {
pr_err("nvgpu: GPU(%s) POWER OFF failed\n", dev_name);
return ret;
}
pr_debug("nvgpu: GPU(%s) POWER OFF done\n", dev_name);
return count;
}
static DRIVER_ATTR_WO(poweroff);
static ssize_t poweron_store(struct device_driver *drv,
const char *buf, size_t count)
{
struct nvgpu_pci_power *pp;
char dev_name[PCI_DEV_NAME_MAX];
int ret;
ret = nvgpu_pci_parse_dev_name(buf, count, dev_name);
if (ret)
return ret;
pp = nvgpu_pci_get_pci_power(dev_name);
if (!pp)
return -ENODEV;
ret = nvgpu_pci_set_powerstate(dev_name, NVGPU_POWER_ON);
if (ret) {
pr_err("nvgpu: GPU(%s) POWER ON failed\n", dev_name);
return ret;
}
pr_debug("nvgpu: GPU(%s) POWER ON done\n", dev_name);
return count;
}
static DRIVER_ATTR_WO(poweron);
int __init nvgpu_pci_power_init(struct pci_driver *nvgpu_pci_driver)
{
@@ -584,8 +653,21 @@ int __init nvgpu_pci_power_init(struct pci_driver *nvgpu_pci_driver)
}
pci_power_stats_dbgfs_dentry = d;
ret = driver_create_file(driver, &driver_attr_poweroff);
if (ret)
goto err_poweroff;
ret = driver_create_file(driver, &driver_attr_poweron);
if (ret)
goto err_poweron;
return 0;
err_poweron:
driver_remove_file(driver, &driver_attr_poweroff);
err_poweroff:
debugfs_remove(d);
pci_power_stats_dbgfs_dentry = NULL;
err_power_stats:
driver_remove_file(driver, &driver_attr_probed_gpus);
err_probed_gpus:
@@ -596,6 +678,9 @@ void __exit nvgpu_pci_power_exit(struct pci_driver *nvgpu_pci_driver)
{
struct device_driver *driver = &nvgpu_pci_driver->driver;
driver_remove_file(driver, &driver_attr_poweroff);
driver_remove_file(driver, &driver_attr_poweron);
debugfs_remove(pci_power_stats_dbgfs_dentry);
driver_remove_file(driver, &driver_attr_probed_gpus);