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drm/radeon/pm: don't allow debugfs/sysfs access when PX card is off (v2)

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When the PX card is off don't try and access it. Avoid hw access
to the card while it's off (e.g., reading back invalid temperature).

v2: be less strict

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=76321

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Alex Deucher 2014-05-19 19:21:29 -04:00 committed by Christian König
parent 24f47acc78
commit 4f2f203976
1 changed files with 41 additions and 1 deletions
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42
drivers/gpu/drm/radeon/radeon_pm.c
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@ -361,6 +361,11 @@ static ssize_t radeon_set_pm_profile(struct device *dev,
struct drm_device *ddev = dev_get_drvdata(dev);
struct radeon_device *rdev = ddev->dev_private;
/* Can't set profile when the card is off */
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON))
return -EINVAL;
mutex_lock(&rdev->pm.mutex);
if (rdev->pm.pm_method == PM_METHOD_PROFILE) {
if (strncmp("default", buf, strlen("default")) == 0)
@ -409,6 +414,13 @@ static ssize_t radeon_set_pm_method(struct device *dev,
struct drm_device *ddev = dev_get_drvdata(dev);
struct radeon_device *rdev = ddev->dev_private;
/* Can't set method when the card is off */
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON)) {
count = -EINVAL;
goto fail;
}
/* we don't support the legacy modes with dpm */
if (rdev->pm.pm_method == PM_METHOD_DPM) {
count = -EINVAL;
@ -446,6 +458,10 @@ static ssize_t radeon_get_dpm_state(struct device *dev,
struct radeon_device *rdev = ddev->dev_private;
enum radeon_pm_state_type pm = rdev->pm.dpm.user_state;
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON))
return snprintf(buf, PAGE_SIZE, "off\n");
return snprintf(buf, PAGE_SIZE, "%s\n",
(pm == POWER_STATE_TYPE_BATTERY) ? "battery" :
(pm == POWER_STATE_TYPE_BALANCED) ? "balanced" : "performance");
@ -459,6 +475,11 @@ static ssize_t radeon_set_dpm_state(struct device *dev,
struct drm_device *ddev = dev_get_drvdata(dev);
struct radeon_device *rdev = ddev->dev_private;
/* Can't set dpm state when the card is off */
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON))
return -EINVAL;
mutex_lock(&rdev->pm.mutex);
if (strncmp("battery", buf, strlen("battery")) == 0)
rdev->pm.dpm.user_state = POWER_STATE_TYPE_BATTERY;
@ -485,6 +506,10 @@ static ssize_t radeon_get_dpm_forced_performance_level(struct device *dev,
struct radeon_device *rdev = ddev->dev_private;
enum radeon_dpm_forced_level level = rdev->pm.dpm.forced_level;
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON))
return snprintf(buf, PAGE_SIZE, "off\n");
return snprintf(buf, PAGE_SIZE, "%s\n",
(level == RADEON_DPM_FORCED_LEVEL_AUTO) ? "auto" :
(level == RADEON_DPM_FORCED_LEVEL_LOW) ? "low" : "high");
@ -500,6 +525,11 @@ static ssize_t radeon_set_dpm_forced_performance_level(struct device *dev,
enum radeon_dpm_forced_level level;
int ret = 0;
/* Can't force performance level when the card is off */
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON))
return -EINVAL;
mutex_lock(&rdev->pm.mutex);
if (strncmp("low", buf, strlen("low")) == 0) {
level = RADEON_DPM_FORCED_LEVEL_LOW;
@ -538,8 +568,14 @@ static ssize_t radeon_hwmon_show_temp(struct device *dev,
char *buf)
{
struct radeon_device *rdev = dev_get_drvdata(dev);
struct drm_device *ddev = rdev->ddev;
int temp;
/* Can't get temperature when the card is off */
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON))
return -EINVAL;
if (rdev->asic->pm.get_temperature)
temp = radeon_get_temperature(rdev);
else
@ -1614,8 +1650,12 @@ static int radeon_debugfs_pm_info(struct seq_file *m, void *data)
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct radeon_device *rdev = dev->dev_private;
struct drm_device *ddev = rdev->ddev;
if (rdev->pm.dpm_enabled) {
if ((rdev->flags & RADEON_IS_PX) &&
(ddev->switch_power_state != DRM_SWITCH_POWER_ON)) {
seq_printf(m, "PX asic powered off\n");
} else if (rdev->pm.dpm_enabled) {
mutex_lock(&rdev->pm.mutex);
if (rdev->asic->dpm.debugfs_print_current_performance_level)
radeon_dpm_debugfs_print_current_performance_level(rdev, m);