[PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

[PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

[Rex Zhu]

The minRPM speed maybe equal to zero. so need to check
input RPM not equal to 0, otherwise cause divide-by-zero driver crash.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
index 44527755..d61a9b4 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
@@ -260,6 +260,7 @@ int smu7_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
 	if (hwmgr->thermal_controller.fanInfo.bNoFan ||
 			(hwmgr->thermal_controller.fanInfo.
 			ucTachometerPulsesPerRevolution == 0) ||
+			speed == 0 ||
 			(speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) ||
 			(speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM))
 		return 0;
-- 
1.9.1

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[PATCH 2/3] drm/amdgpu: Add fan RPM setting via sysfs

[Rex Zhu]

User can set fan's revolution per minute via
fan1_input.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h        |  3 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c         | 28 +++++++++++++++++++++++++-
 drivers/gpu/drm/amd/include/kgd_pp_interface.h |  1 +
 drivers/gpu/drm/amd/powerplay/amd_powerplay.c  | 19 +++++++++++++++++
 4 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h
index ff24e1c..0258c6f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h
@@ -278,6 +278,9 @@ enum amdgpu_pcie_gen {
 #define amdgpu_dpm_get_fan_speed_rpm(adev, s) \
 		((adev)->powerplay.pp_funcs->get_fan_speed_rpm)((adev)->powerplay.pp_handle, (s))
 
+#define amdgpu_dpm_set_fan_speed_rpm(adev, s) \
+		((adev)->powerplay.pp_funcs->set_fan_speed_rpm)((adev)->powerplay.pp_handle, (s))
+
 #define amdgpu_dpm_get_sclk(adev, l) \
 		((adev)->powerplay.pp_funcs->get_sclk((adev)->powerplay.pp_handle, (l)))
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 8c334fc..6a5b247 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -1187,6 +1187,32 @@ static ssize_t amdgpu_hwmon_get_fan1_input(struct device *dev,
 	return sprintf(buf, "%i\n", speed);
 }
 
+static ssize_t amdgpu_hwmon_set_fan1_input(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct amdgpu_device *adev = dev_get_drvdata(dev);
+	int err;
+	u32 value;
+
+	/* Can't adjust fan when the card is off */
+	if  ((adev->flags & AMD_IS_PX) &&
+	     (adev->ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+		return -EINVAL;
+
+	err = kstrtou32(buf, 10, &value);
+	if (err)
+		return err;
+
+	if (adev->powerplay.pp_funcs->set_fan_speed_rpm) {
+		err = amdgpu_dpm_set_fan_speed_rpm(adev, value);
+		if (err)
+			return err;
+	}
+
+	return count;
+}
+
 static ssize_t amdgpu_hwmon_show_vddgfx(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
@@ -1419,7 +1445,7 @@ static ssize_t amdgpu_hwmon_set_power_cap(struct device *dev,
 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, amdgpu_hwmon_get_pwm1_enable, amdgpu_hwmon_set_pwm1_enable, 0);
 static SENSOR_DEVICE_ATTR(pwm1_min, S_IRUGO, amdgpu_hwmon_get_pwm1_min, NULL, 0);
 static SENSOR_DEVICE_ATTR(pwm1_max, S_IRUGO, amdgpu_hwmon_get_pwm1_max, NULL, 0);
-static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, amdgpu_hwmon_get_fan1_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO | S_IWUSR, amdgpu_hwmon_get_fan1_input, amdgpu_hwmon_set_fan1_input, 0);
 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, amdgpu_hwmon_show_vddgfx, NULL, 0);
 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, amdgpu_hwmon_show_vddgfx_label, NULL, 0);
 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, amdgpu_hwmon_show_vddnb, NULL, 0);
diff --git a/drivers/gpu/drm/amd/include/kgd_pp_interface.h b/drivers/gpu/drm/amd/include/kgd_pp_interface.h
index 448dee4..d0fe993 100644
--- a/drivers/gpu/drm/amd/include/kgd_pp_interface.h
+++ b/drivers/gpu/drm/amd/include/kgd_pp_interface.h
@@ -227,6 +227,7 @@ struct amd_pm_funcs {
 	enum amd_dpm_forced_level (*get_performance_level)(void *handle);
 	enum amd_pm_state_type (*get_current_power_state)(void *handle);
 	int (*get_fan_speed_rpm)(void *handle, uint32_t *rpm);
+	int (*set_fan_speed_rpm)(void *handle, uint32_t rpm);
 	int (*get_pp_num_states)(void *handle, struct pp_states_info *data);
 	int (*get_pp_table)(void *handle, char **table);
 	int (*set_pp_table)(void *handle, const char *buf, size_t size);
diff --git a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
index f486d50..60392cb 100644
--- a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
@@ -586,6 +586,24 @@ static int pp_dpm_get_fan_speed_rpm(void *handle, uint32_t *rpm)
 	return ret;
 }
 
+static int pp_dpm_set_fan_speed_rpm(void *handle, uint32_t rpm)
+{
+	struct pp_hwmgr *hwmgr = handle;
+	int ret = 0;
+
+	if (!hwmgr || !hwmgr->pm_en)
+		return -EINVAL;
+
+	if (hwmgr->hwmgr_func->set_fan_speed_rpm == NULL) {
+		pr_info("%s was not implemented.\n", __func__);
+		return 0;
+	}
+	mutex_lock(&hwmgr->smu_lock);
+	ret = hwmgr->hwmgr_func->set_fan_speed_rpm(hwmgr, rpm);
+	mutex_unlock(&hwmgr->smu_lock);
+	return ret;
+}
+
 static int pp_dpm_get_pp_num_states(void *handle,
 		struct pp_states_info *data)
 {
@@ -1265,6 +1283,7 @@ static int pp_notify_smu_enable_pwe(void *handle)
 	.set_fan_speed_percent = pp_dpm_set_fan_speed_percent,
 	.get_fan_speed_percent = pp_dpm_get_fan_speed_percent,
 	.get_fan_speed_rpm = pp_dpm_get_fan_speed_rpm,
+	.set_fan_speed_rpm = pp_dpm_set_fan_speed_rpm,
 	.get_pp_num_states = pp_dpm_get_pp_num_states,
 	.get_pp_table = pp_dpm_get_pp_table,
 	.set_pp_table = pp_dpm_set_pp_table,
-- 
1.9.1

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[PATCH 3/3] drm/amd/pp: Fix fan's RPM setting not work on VI/Vega10

[Rex Zhu]

set the target rpm value to wrong register.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c   | 2 +-
 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
index d61a9b4..5bdc0df 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
@@ -273,7 +273,7 @@ int smu7_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
 	tach_period = 60 * crystal_clock_freq * 10000 / (8 * speed);
 
 	PHM_WRITE_VFPF_INDIRECT_FIELD(hwmgr->device, CGS_IND_REG__SMC,
-				CG_TACH_STATUS, TACH_PERIOD, tach_period);
+				CG_TACH_CTRL, TARGET_PERIOD, tach_period);
 
 	return smu7_fan_ctrl_set_static_mode(hwmgr, FDO_PWM_MODE_STATIC_RPM);
 }
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
index aa044c1..c0711084 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
@@ -321,9 +321,9 @@ int vega10_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
 	if (!result) {
 		crystal_clock_freq = amdgpu_asic_get_xclk((struct amdgpu_device *)hwmgr->adev);
 		tach_period = 60 * crystal_clock_freq * 10000 / (8 * speed);
-		WREG32_SOC15(THM, 0, mmCG_TACH_STATUS,
-				REG_SET_FIELD(RREG32_SOC15(THM, 0, mmCG_TACH_STATUS),
-					CG_TACH_STATUS, TACH_PERIOD,
+		WREG32_SOC15(THM, 0, mmCG_TACH_CTRL,
+				REG_SET_FIELD(RREG32_SOC15(THM, 0, mmCG_TACH_CTRL),
+					CG_TACH_CTRL, TARGET_PERIOD,
 					tach_period));
 	}
 	return vega10_fan_ctrl_set_static_mode(hwmgr, FDO_PWM_MODE_STATIC_RPM);
-- 
1.9.1

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Re: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

[Deucher, Alexander]

[-- Attachment #1.1: Type: text/plain, Size: 1755 bytes --]

Series is:

Reviewed-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org>

________________________________
From: amd-gfx <amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org> on behalf of Rex Zhu <Rex.Zhu-5C7GfCeVMHo@public.gmane.org>
Sent: Thursday, September 20, 2018 3:14:25 AM
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: Zhu, Rex
Subject: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

The minRPM speed maybe equal to zero. so need to check
input RPM not equal to 0, otherwise cause divide-by-zero driver crash.

Signed-off-by: Rex Zhu <Rex.Zhu-5C7GfCeVMHo@public.gmane.org>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
index 44527755..d61a9b4 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
@@ -260,6 +260,7 @@ int smu7_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
         if (hwmgr->thermal_controller.fanInfo.bNoFan ||
                         (hwmgr->thermal_controller.fanInfo.
                         ucTachometerPulsesPerRevolution == 0) ||
+                       speed == 0 ||
                         (speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) ||
                         (speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM))
                 return 0;
--
1.9.1

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RE: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

[Zhu, Rex]

[-- Attachment #1.1: Type: text/plain, Size: 3370 bytes --]

Hi Alex and Evan,

For the fan control via sysfs,  I think we need to clarify the use case.

We support manual/auto fan control mode.

User can set the mode through pwm_enable. 1 mean manual. 2 mean auto
User can set fan speed via pwm1 and fan1_input.

For pwm1, user set the percentage value (0% - 100%)
And can get the pwm1's range via sysfs: pwm1_min, pwm1_max. the range is [0, 255]. In driver, we transfer to [0% - 100%]

For fan1_input, user set the fan's resolution per minute
No way for user to get the range. On Tonga, the range is (0, 6000]. Not support zero-rpm on tonga.

Do we need to add new sysfs to expose the RPM range or just print the range in dmesg if user's setting is out of range?

Another question is:

Currently, the default fan control mode is auto.
When user change the fan speed via pwm1 or fan1_input, we switch to manual mode automatically.

So if user want to change back to auto fan control mode, they need to echo 2 to pwm_enable.

Best Regards
Rex


From: Deucher, Alexander
Sent: Thursday, September 20, 2018 9:52 PM
To: Zhu, Rex <Rex.Zhu-5C7GfCeVMHo@public.gmane.org>; amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: Re: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm


Series is:

Reviewed-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org<mailto:alexander.deucher-5C7GfCeVMHo@public.gmane.org>>

________________________________
From: amd-gfx <amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org<mailto:amd-gfx-bounces@lists.freedesktop.org>> on behalf of Rex Zhu <Rex.Zhu-5C7GfCeVMHo@public.gmane.org<mailto:Rex.Zhu-5C7GfCeVMHo@public.gmane.org>>
Sent: Thursday, September 20, 2018 3:14:25 AM
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org<mailto:amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>
Cc: Zhu, Rex
Subject: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

The minRPM speed maybe equal to zero. so need to check
input RPM not equal to 0, otherwise cause divide-by-zero driver crash.

Signed-off-by: Rex Zhu <Rex.Zhu-5C7GfCeVMHo@public.gmane.org<mailto:Rex.Zhu-5C7GfCeVMHo@public.gmane.org>>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
index 44527755..d61a9b4 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
@@ -260,6 +260,7 @@ int smu7_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
         if (hwmgr->thermal_controller.fanInfo.bNoFan ||
                         (hwmgr->thermal_controller.fanInfo.
                         ucTachometerPulsesPerRevolution == 0) ||
+                       speed == 0 ||
                         (speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) ||
                         (speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM))
                 return 0;
--
1.9.1

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Re: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm

[Deucher, Alexander]

[-- Attachment #1.1: Type: text/plain, Size: 3991 bytes --]


________________________________
From: Zhu, Rex
Sent: Thursday, September 20, 2018 10:43 AM
To: Deucher, Alexander; amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org; Quan, Evan
Subject: RE: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm


Hi Alex and Evan,



For the fan control via sysfs,  I think we need to clarify the use case.



We support manual/auto fan control mode.



User can set the mode through pwm_enable. 1 mean manual. 2 mean auto

User can set fan speed via pwm1 and fan1_input.



For pwm1, user set the percentage value (0% - 100%)

And can get the pwm1’s range via sysfs: pwm1_min, pwm1_max. the range is [0, 255]. In driver, we transfer to [0% - 100%]



For fan1_input, user set the fan’s resolution per minute

No way for user to get the range. On Tonga, the range is (0, 6000]. Not support zero-rpm on tonga.



Do we need to add new sysfs to expose the RPM range or just print the range in dmesg if user’s setting is out of range?



Yes, expose the rpm limits via fan1_min and max.  See:

https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface

for more info on standard sysfs interfaces for hwmon.


Another question is:



Currently, the default fan control mode is auto.

When user change the fan speed via pwm1 or fan1_input, we switch to manual mode automatically.



So if user want to change back to auto fan control mode, they need to echo 2 to pwm_enable.



I think we should reject any changes unless the user selects manual (1) first.


Best Regards

Rex





From: Deucher, Alexander
Sent: Thursday, September 20, 2018 9:52 PM
To: Zhu, Rex <Rex.Zhu-5C7GfCeVMHo@public.gmane.org>; amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: Re: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm



Series is:

Reviewed-by: Alex Deucher <alexander.deucher-5C7GfCeVMHo@public.gmane.org<mailto:alexander.deucher-5C7GfCeVMHo@public.gmane.org>>

________________________________

From: amd-gfx <amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org<mailto:amd-gfx-bounces@lists.freedesktop.org>> on behalf of Rex Zhu <Rex.Zhu-5C7GfCeVMHo@public.gmane.org<mailto:Rex.Zhu-5C7GfCeVMHo@public.gmane.org>>
Sent: Thursday, September 20, 2018 3:14:25 AM
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org<mailto:amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>
Cc: Zhu, Rex
Subject: [PATCH 1/3] drm/amd/pp: Avoid divide-by-zero in smu7_fan_ctrl_set_fan_speed_rpm



The minRPM speed maybe equal to zero. so need to check
input RPM not equal to 0, otherwise cause divide-by-zero driver crash.

Signed-off-by: Rex Zhu <Rex.Zhu-5C7GfCeVMHo@public.gmane.org<mailto:Rex.Zhu-5C7GfCeVMHo@public.gmane.org>>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
index 44527755..d61a9b4 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_thermal.c
@@ -260,6 +260,7 @@ int smu7_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
         if (hwmgr->thermal_controller.fanInfo.bNoFan ||
                         (hwmgr->thermal_controller.fanInfo.
                         ucTachometerPulsesPerRevolution == 0) ||
+                       speed == 0 ||
                         (speed < hwmgr->thermal_controller.fanInfo.ulMinRPM) ||
                         (speed > hwmgr->thermal_controller.fanInfo.ulMaxRPM))
                 return 0;
--
1.9.1

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