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gpu: nvgpu: Add sysfs node to enable rail gating

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Add sysfs node "railgate_enable" to enable
gpu railgating dynamically.

Bug 1552469

Reviewed-on: http://git-master/r/804746
(cherry picked from commit 53d76d1d1576a96c70f66b744411d2909ec8414f)

Change-Id: I69ac63958b00ae4ea5d9ccbaed03316d35ddc5eb
Signed-off-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: http://git-master/r/822208
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Seshendra Gadagottu
2015-09-24 13:16:33 -07:00
committed by Terje Bergstrom
parent 3684ed8fd6
commit 5c26f72fe1
1 changed files with 64 additions and 0 deletions
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64
drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
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@@ -226,6 +226,64 @@ static DEVICE_ATTR(ptimer_scale_factor,
ptimer_scale_factor_show,
NULL);
#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_PM_GENERIC_DOMAINS)
static ssize_t railgate_enable_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct gk20a_platform *platform = dev_get_drvdata(dev);
struct generic_pm_domain *genpd = dev_to_genpd(dev);
struct platform_device *ndev = to_platform_device(dev);
struct gk20a *g = get_gk20a(ndev);
unsigned long railgate_enable = 0;
int err;
if (kstrtoul(buf, 10, &railgate_enable) < 0)
return -EINVAL;
if (railgate_enable && !platform->can_railgate) {
mutex_lock(&platform->railgate_lock);
platform->can_railgate = true;
genpd->gov = NULL;
pm_genpd_set_poweroff_delay(genpd, platform->railgate_delay);
/* release extra ref count:if power domains not enabled */
if ((platform->railgate) && \
!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
err = platform->railgate(ndev);
mutex_unlock(&platform->railgate_lock);
} else if (railgate_enable == 0 && platform->can_railgate) {
mutex_lock(&platform->railgate_lock);
platform->can_railgate = false;
genpd->gov = &pm_domain_always_on_gov;
pm_genpd_set_poweroff_delay(genpd, platform->railgate_delay);
/* take extra ref count - incase of power domains not enabled */
if ((platform->unrailgate) && \
!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
err = platform->unrailgate(ndev);
mutex_unlock(&platform->railgate_lock);
}
dev_info(dev, "railgate is %s.\n", platform->can_railgate ?
"enabled" : "disabled");
/* wake-up system to make railgating_enable effective immediately */
err = gk20a_busy(g->dev);
if (err)
return err;
gk20a_idle(g->dev);
return count;
}
static ssize_t railgate_enable_read(struct device *device,
struct device_attribute *attr, char *buf)
{
struct platform_device *ndev = to_platform_device(device);
struct gk20a_platform *platform = dev_get_drvdata(&ndev->dev);
return sprintf(buf, "%d\n", platform->can_railgate ? 1 : 0);
}
static DEVICE_ATTR(railgate_enable, ROOTRW, railgate_enable_read,
railgate_enable_store);
#endif
static ssize_t railgate_delay_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -711,6 +769,9 @@ void gk20a_remove_sysfs(struct device *dev)
device_remove_file(dev, &dev_attr_clockgate_delay);
#ifdef CONFIG_PM_RUNTIME
device_remove_file(dev, &dev_attr_force_idle);
#if defined(CONFIG_PM_GENERIC_DOMAINS)
device_remove_file(dev, &dev_attr_railgate_enable);
#endif
#endif
device_remove_file(dev, &dev_attr_aelpg_param);
device_remove_file(dev, &dev_attr_aelpg_enable);
@@ -741,6 +802,9 @@ void gk20a_create_sysfs(struct platform_device *dev)
error |= device_create_file(&dev->dev, &dev_attr_clockgate_delay);
#ifdef CONFIG_PM_RUNTIME
error |= device_create_file(&dev->dev, &dev_attr_force_idle);
#if defined(CONFIG_PM_GENERIC_DOMAINS)
error |= device_create_file(&dev->dev, &dev_attr_railgate_enable);
#endif
#endif
error |= device_create_file(&dev->dev, &dev_attr_aelpg_param);
error |= device_create_file(&dev->dev, &dev_attr_aelpg_enable);