[PATCH 2/2] drm/nouveau/hwmon: Convert to use devm_hwmon_device_register_with_groups

Guenter Roeck
2013-11-23T05:52:36Z

Simplify the code and resolve race conditions seen because
attribute files are created after hwmon device registration,
and removed before hwmon device removal.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
Compile tested only; unfortunately I don't have the the necessary hardware.

drivers/gpu/drm/nouveau/nouveau_hwmon.c | 243 +++++++++++--------------------
drivers/gpu/drm/nouveau/nouveau_hwmon.h | 11 --
2 files changed, 84 insertions(+), 170 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.c b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
index 38a4db5..d4144b8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_hwmon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
@@ -42,9 +42,7 @@
static ssize_t
nouveau_hwmon_show_temp(struct device *d, struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
int temp = therm->temp_get(therm);

if (temp < 0)
@@ -68,9 +66,7 @@ static ssize_t
nouveau_hwmon_temp1_auto_point1_temp(struct device *d,
struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_FAN_BOOST) * 1000);
@@ -80,9 +76,7 @@ nouveau_hwmon_set_temp1_auto_point1_temp(struct device *d,
struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -101,9 +95,7 @@ static ssize_t
nouveau_hwmon_temp1_auto_point1_temp_hyst(struct device *d,
struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_FAN_BOOST_HYST) * 1000);
@@ -113,9 +105,7 @@ nouveau_hwmon_set_temp1_auto_point1_temp_hyst(struct device *d,
struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -133,9 +123,7 @@ static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp_hyst, S_IRUGO | S_IWUSR,
static ssize_t
nouveau_hwmon_max_temp(struct device *d, struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_DOWN_CLK) * 1000);
@@ -144,9 +132,7 @@ static ssize_t
nouveau_hwmon_set_max_temp(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -164,9 +150,7 @@ static ssize_t
nouveau_hwmon_max_temp_hyst(struct device *d, struct device_attribute *a,
char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_DOWN_CLK_HYST) * 1000);
@@ -175,9 +159,7 @@ static ssize_t
nouveau_hwmon_set_max_temp_hyst(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -196,9 +178,7 @@ static ssize_t
nouveau_hwmon_critical_temp(struct device *d, struct device_attribute *a,
char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_CRITICAL) * 1000);
@@ -208,9 +188,7 @@ nouveau_hwmon_set_critical_temp(struct device *d, struct device_attribute *a,
const char *buf,
size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -229,9 +207,7 @@ static ssize_t
nouveau_hwmon_critical_temp_hyst(struct device *d, struct device_attribute *a,
char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_CRITICAL_HYST) * 1000);
@@ -242,9 +218,7 @@ nouveau_hwmon_set_critical_temp_hyst(struct device *d,
const char *buf,
size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -262,9 +236,7 @@ static ssize_t
nouveau_hwmon_emergency_temp(struct device *d, struct device_attribute *a,
char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_SHUTDOWN) * 1000);
@@ -274,9 +246,7 @@ nouveau_hwmon_set_emergency_temp(struct device *d, struct device_attribute *a,
const char *buf,
size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -295,9 +265,7 @@ static ssize_t
nouveau_hwmon_emergency_temp_hyst(struct device *d, struct device_attribute *a,
char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n",
therm->attr_get(therm, NOUVEAU_THERM_ATTR_THRS_SHUTDOWN_HYST) * 1000);
@@ -308,9 +276,7 @@ nouveau_hwmon_set_emergency_temp_hyst(struct device *d,
const char *buf,
size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -326,14 +292,6 @@ static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO | S_IWUSR,
nouveau_hwmon_set_emergency_temp_hyst,
0);

-static ssize_t nouveau_hwmon_show_name(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "nouveau\n");
-}
-static SENSOR_DEVICE_ATTR(name, S_IRUGO, nouveau_hwmon_show_name, NULL, 0);
-
static ssize_t nouveau_hwmon_show_update_rate(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -348,9 +306,7 @@ static ssize_t
nouveau_hwmon_show_fan1_input(struct device *d, struct device_attribute *attr,
char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);

return snprintf(buf, PAGE_SIZE, "%d\n", therm->fan_sense(therm));
}
@@ -361,9 +317,7 @@ static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, nouveau_hwmon_show_fan1_input,
nouveau_hwmon_get_pwm1_enable(struct device *d,
struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
int ret;

ret = therm->attr_get(therm, NOUVEAU_THERM_ATTR_FAN_MODE);
@@ -377,9 +331,7 @@ static ssize_t
nouveau_hwmon_set_pwm1_enable(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;
int ret;

@@ -399,9 +351,7 @@ static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
static ssize_t
nouveau_hwmon_get_pwm1(struct device *d, struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
int ret;

ret = therm->fan_get(therm);
@@ -415,10 +365,8 @@ static ssize_t
nouveau_hwmon_set_pwm1(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
- int ret = -ENODEV;
+ struct nouveau_therm *therm = dev_get_drvdata(d);
+ int ret;
long value;

if (kstrtol(buf, 10, &value) == -EINVAL)
@@ -439,9 +387,7 @@ static ssize_t
nouveau_hwmon_get_pwm1_min(struct device *d,
struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
int ret;

ret = therm->attr_get(therm, NOUVEAU_THERM_ATTR_FAN_MIN_DUTY);
@@ -455,9 +401,7 @@ static ssize_t
nouveau_hwmon_set_pwm1_min(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;
int ret;

@@ -479,9 +423,7 @@ static ssize_t
nouveau_hwmon_get_pwm1_max(struct device *d,
struct device_attribute *a, char *buf)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
int ret;

ret = therm->attr_get(therm, NOUVEAU_THERM_ATTR_FAN_MAX_DUTY);
@@ -495,9 +437,7 @@ static ssize_t
nouveau_hwmon_set_pwm1_max(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
- struct drm_device *dev = dev_get_drvdata(d);
- struct nouveau_drm *drm = nouveau_drm(dev);
- struct nouveau_therm *therm = nouveau_therm(drm->device);
+ struct nouveau_therm *therm = dev_get_drvdata(d);
long value;
int ret;

@@ -516,7 +456,6 @@ static SENSOR_DEVICE_ATTR(pwm1_max, S_IRUGO | S_IWUSR,
nouveau_hwmon_set_pwm1_max, 0);

static struct attribute *hwmon_default_attributes[] = {
- &sensor_dev_attr_name.dev_attr.attr,
&sensor_dev_attr_update_rate.dev_attr.attr,
NULL
};
@@ -545,18 +484,71 @@ static struct attribute *hwmon_pwm_fan_attributes[] = {
NULL
};

+static umode_t hwmon_temp_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nouveau_therm *therm = dev_get_drvdata(dev);
+
+ if (therm->temp_get(therm) < 0)
+ return 0;
+
+ return attr->mode;
+}
+
+static umode_t hwmon_fan_rpm_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nouveau_therm *therm = dev_get_drvdata(dev);
+
+ if (therm->fan_sense(therm) < 0)
+ return 0;
+
+ return attr->mode;
+}
+
+static umode_t hwmon_pwm_fan_is_visible(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nouveau_therm *therm = dev_get_drvdata(dev);
+
+ /*
+ * XXX: incorrect, need better detection for this, some boards have
+ * the gpio entries for pwm fan control even when there's no
+ * actual fan connected to it... therm table?
+ */
+ if (!therm->fan_get || therm->fan_get(therm) < 0)
+ return 0;
+
+ return attr->mode;
+}
+
static const struct attribute_group hwmon_default_attrgroup = {
.attrs = hwmon_default_attributes,
};
static const struct attribute_group hwmon_temp_attrgroup = {
.attrs = hwmon_temp_attributes,
+ .is_visible = hwmon_temp_is_visible,
};
static const struct attribute_group hwmon_fan_rpm_attrgroup = {
.attrs = hwmon_fan_rpm_attributes,
+ .is_visible = hwmon_fan_rpm_is_visible,
};
static const struct attribute_group hwmon_pwm_fan_attrgroup = {
.attrs = hwmon_pwm_fan_attributes,
+ .is_visible = hwmon_pwm_fan_is_visible,
+};
+
+static const struct attribute_group *hwmon_attr_groups[] = {
+ &hwmon_default_attrgroup,
+ &hwmon_temp_attrgroup,
+ &hwmon_fan_rpm_attrgroup,
+ &hwmon_pwm_fan_attrgroup,
+ NULL
};
+
#endif

int
@@ -565,92 +557,25 @@ nouveau_hwmon_init(struct drm_device *dev)
#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
struct nouveau_drm *drm = nouveau_drm(dev);
struct nouveau_therm *therm = nouveau_therm(drm->device);
- struct nouveau_hwmon *hwmon;
struct device *hwmon_dev;
int ret = 0;

- hwmon = drm->hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
- if (!hwmon)
- return -ENOMEM;
- hwmon->dev = dev;
-
if (!therm || !therm->temp_get || !therm->attr_get || !therm->attr_set)
return -ENODEV;

- hwmon_dev = hwmon_device_register(&dev->pdev->dev);
+ hwmon_dev = devm_hwmon_device_register_with_groups(&dev->pdev->dev,
+ "nouveau", therm,
+ hwmon_attr_groups);
if (IS_ERR(hwmon_dev)) {
ret = PTR_ERR(hwmon_dev);
NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
return ret;
}
- dev_set_drvdata(hwmon_dev, dev);
-
- /* set the default attributes */
- ret = sysfs_create_group(&hwmon_dev->kobj, &hwmon_default_attrgroup);
- if (ret) {
- if (ret)
- goto error;
- }
-
- /* if the card has a working thermal sensor */
- if (therm->temp_get(therm) >= 0) {
- ret = sysfs_create_group(&hwmon_dev->kobj, &hwmon_temp_attrgroup);
- if (ret) {
- if (ret)
- goto error;
- }
- }
-
- /* if the card has a pwm fan */
- /*XXX: incorrect, need better detection for this, some boards have
- * the gpio entries for pwm fan control even when there's no
- * actual fan connected to it... therm table? */
- if (therm->fan_get && therm->fan_get(therm) >= 0) {
- ret = sysfs_create_group(&hwmon_dev->kobj,
- &hwmon_pwm_fan_attrgroup);
- if (ret)
- goto error;
- }
-
- /* if the card can read the fan rpm */
- if (therm->fan_sense(therm) >= 0) {
- ret = sysfs_create_group(&hwmon_dev->kobj,
- &hwmon_fan_rpm_attrgroup);
- if (ret)
- goto error;
- }
-
- hwmon->hwmon = hwmon_dev;
-
- return 0;
-
-error:
- NV_ERROR(drm, "Unable to create some hwmon sysfs files: %d\n", ret);
- hwmon_device_unregister(hwmon_dev);
- hwmon->hwmon = NULL;
- return ret;
-#else
- hwmon->hwmon = NULL;
- return 0;
#endif
+ return 0;
}

void
nouveau_hwmon_fini(struct drm_device *dev)
{
-#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
- struct nouveau_hwmon *hwmon = nouveau_hwmon(dev);
-
- if (hwmon->hwmon) {
- sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_default_attrgroup);
- sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_temp_attrgroup);
- sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_pwm_fan_attrgroup);
- sysfs_remove_group(&hwmon->hwmon->kobj, &hwmon_fan_rpm_attrgroup);
-
- hwmon_device_unregister(hwmon->hwmon);
- }
-
- nouveau_drm(dev)->hwmon = NULL;
- kfree(hwmon);
-#endif
}
diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.h b/drivers/gpu/drm/nouveau/nouveau_hwmon.h
index 62ccbb3..21a2d1d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_hwmon.h
+++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.h
@@ -25,17 +25,6 @@
#ifndef __NOUVEAU_PM_H__
#define __NOUVEAU_PM_H__

-struct nouveau_hwmon {
- struct drm_device *dev;
- struct device *hwmon;
-};
-
-static inline struct nouveau_hwmon *
-nouveau_hwmon(struct drm_device *dev)
-{
- return nouveau_drm(dev)->hwmon;
-}
-
/* nouveau_hwmon.c */
int nouveau_hwmon_init(struct drm_device *dev);
void nouveau_hwmon_fini(struct drm_device *dev);
--
1.7.9.7