| Message ID | 20240823034548.2670032-1-raag.jadav@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v7] drm/i915/hwmon: expose fan speed | expand |
On 23-08-2024 09:15, Raag Jadav wrote: > Add hwmon support for fan1_input attribute, which will expose fan speed > in RPM. With this in place we can monitor fan speed using lm-sensors tool. > > $ sensors > i915-pci-0300 > Adapter: PCI adapter > in0: 653.00 mV > fan1: 3833 RPM > power1: N/A (max = 43.00 W) > energy1: 32.02 kJ > > v2: Handle overflow, add mutex protection and ABI documentation > Aesthetic adjustments (Riana) > v3: Change rotations data type, ABI date and version > v4: Fix wakeref leak > Drop switch case and simplify hwm_fan_xx() (Andi) > v5: Rework time calculation, aesthetic adjustments (Andy) > v6: Drop redundant overflow logic (Andy) > Split fan_input_read() into dedicated helper (Badal) > v7: Fix undefined reference to __udivdi3 for i386 (Andy) > > Signed-off-by: Raag Jadav <raag.jadav@intel.com> > Reviewed-by: Riana Tauro <riana.tauro@intel.com> > Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> > --- > .../ABI/testing/sysfs-driver-intel-i915-hwmon | 8 ++ > drivers/gpu/drm/i915/gt/intel_gt_regs.h | 2 + > drivers/gpu/drm/i915/i915_hwmon.c | 88 +++++++++++++++++++ > 3 files changed, 98 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > index 92fe7c5c5ac1..be4141a7522f 100644 > --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > @@ -75,3 +75,11 @@ Description: RO. Energy input of device or gt in microjoules. > for the gt. > > Only supported for particular Intel i915 graphics platforms. > + > +What: /sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/fan1_input > +Date: November 2024 > +KernelVersion: 6.12 > +Contact: intel-gfx@lists.freedesktop.org > +Description: RO. Fan speed of device in RPM. > + > + Only supported for particular Intel i915 graphics platforms. > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > index e42b3a5d4e63..57a3c83d3655 100644 > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > @@ -1553,6 +1553,8 @@ > #define VLV_RENDER_C0_COUNT _MMIO(0x138118) > #define VLV_MEDIA_C0_COUNT _MMIO(0x13811c) > > +#define PCU_PWM_FAN_SPEED _MMIO(0x138140) > + > #define GEN12_RPSTAT1 _MMIO(0x1381b4) > #define GEN12_VOLTAGE_MASK REG_GENMASK(10, 0) > #define GEN12_CAGF_MASK REG_GENMASK(19, 11) > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c > index 49db3e09826c..17d30f6b84b0 100644 > --- a/drivers/gpu/drm/i915/i915_hwmon.c > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > @@ -5,6 +5,7 @@ > > #include <linux/hwmon.h> > #include <linux/hwmon-sysfs.h> > +#include <linux/jiffies.h> > #include <linux/types.h> > > #include "i915_drv.h" > @@ -36,6 +37,7 @@ struct hwm_reg { > i915_reg_t pkg_rapl_limit; > i915_reg_t energy_status_all; > i915_reg_t energy_status_tile; > + i915_reg_t fan_speed; > }; > > struct hwm_energy_info { > @@ -43,11 +45,17 @@ struct hwm_energy_info { > long accum_energy; /* Accumulated energy for energy1_input */ > }; > > +struct hwm_fan_info { > + u32 reg_val_prev; > + u64 time_prev; > +}; > + > struct hwm_drvdata { > struct i915_hwmon *hwmon; > struct intel_uncore *uncore; > struct device *hwmon_dev; > struct hwm_energy_info ei; /* Energy info for energy1_input */ > + struct hwm_fan_info fi; /* Fan info for fan1_input */ > char name[12]; > int gt_n; > bool reset_in_progress; > @@ -276,6 +284,7 @@ static const struct hwmon_channel_info * const hwm_info[] = { > HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX | HWMON_P_CRIT), > HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT), > HWMON_CHANNEL_INFO(curr, HWMON_C_CRIT), > + HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT), > NULL > }; > > @@ -613,6 +622,69 @@ hwm_curr_write(struct hwm_drvdata *ddat, u32 attr, long val) > } > } > > +static umode_t > +hwm_fan_is_visible(const struct hwm_drvdata *ddat, u32 attr) > +{ > + struct i915_hwmon *hwmon = ddat->hwmon; > + > + if (attr == hwmon_fan_input && i915_mmio_reg_valid(hwmon->rg.fan_speed)) > + return 0444; > + > + return 0; > +} > + > +static int > +hwm_fan_input_read(struct hwm_drvdata *ddat, long *val) > +{ > + struct i915_hwmon *hwmon = ddat->hwmon; > + struct hwm_fan_info *fi = &ddat->fi; > + u64 rotations, time_now, time; > + intel_wakeref_t wakeref; > + u32 reg_val; > + int ret = 0; > + > + wakeref = intel_runtime_pm_get(ddat->uncore->rpm); > + mutex_lock(&hwmon->hwmon_lock); > + > + reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.fan_speed); > + time_now = get_jiffies_64(); > + > + /* > + * HW register value is accumulated count of pulses from > + * PWM fan with the scale of 2 pulses per rotation. > + */ > + rotations = (reg_val - fi->reg_val_prev) / 2; > + > + time = jiffies_delta_to_msecs(time_now - fi->time_prev); > + if (unlikely(!time)) { > + ret = -EAGAIN; > + goto exit; > + } > + > + /* > + * Calculate fan speed in RPM by time averaging two subsequent > + * readings in minutes. > + * RPM = number of rotations * msecs per minute / time in msecs > + */ > + *val = DIV_ROUND_UP_ULL(rotations * (MSEC_PER_SEC * 60), time); > + > + fi->reg_val_prev = reg_val; > + fi->time_prev = time_now; > +exit: > + mutex_unlock(&hwmon->hwmon_lock); > + intel_runtime_pm_put(ddat->uncore->rpm, wakeref); > + return ret; > +} > + > +static int > +hwm_fan_read(struct hwm_drvdata *ddat, u32 attr, long *val) > +{ > + if (attr == hwmon_fan_input) > + return hwm_fan_input_read(ddat, val); > + > + return -EOPNOTSUPP; > +} > + > static umode_t > hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > u32 attr, int channel) > @@ -628,6 +700,8 @@ hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > return hwm_energy_is_visible(ddat, attr); > case hwmon_curr: > return hwm_curr_is_visible(ddat, attr); > + case hwmon_fan: > + return hwm_fan_is_visible(ddat, attr); > default: > return 0; > } > @@ -648,6 +722,8 @@ hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, > return hwm_energy_read(ddat, attr, val); > case hwmon_curr: > return hwm_curr_read(ddat, attr, val); > + case hwmon_fan: > + return hwm_fan_read(ddat, attr, val); > default: > return -EOPNOTSUPP; > } > @@ -739,12 +815,14 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) > hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT; > hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS; > hwmon->rg.energy_status_tile = INVALID_MMIO_REG; > + hwmon->rg.fan_speed = PCU_PWM_FAN_SPEED; > } else { > hwmon->rg.pkg_power_sku_unit = INVALID_MMIO_REG; > hwmon->rg.pkg_power_sku = INVALID_MMIO_REG; > hwmon->rg.pkg_rapl_limit = INVALID_MMIO_REG; > hwmon->rg.energy_status_all = INVALID_MMIO_REG; > hwmon->rg.energy_status_tile = INVALID_MMIO_REG; > + hwmon->rg.fan_speed = INVALID_MMIO_REG; > } > > with_intel_runtime_pm(uncore->rpm, wakeref) { > @@ -755,6 +833,16 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) > if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku_unit)) > val_sku_unit = intel_uncore_read(uncore, > hwmon->rg.pkg_power_sku_unit); > + > + /* > + * Store the initial fan register value, so that we can use it for > + * initial fan speed calculation. > + */ > + if (i915_mmio_reg_valid(hwmon->rg.fan_speed)) { > + ddat->fi.reg_val_prev = intel_uncore_read(uncore, > + hwmon->rg.fan_speed); > + ddat->fi.time_prev = get_jiffies_64(); > + } Reviewed-by: Badal Nilawar <badal.nilawar@intel.com> > } > > hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit);
diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon index 92fe7c5c5ac1..be4141a7522f 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon @@ -75,3 +75,11 @@ Description: RO. Energy input of device or gt in microjoules. for the gt. Only supported for particular Intel i915 graphics platforms. + +What: /sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/fan1_input +Date: November 2024 +KernelVersion: 6.12 +Contact: intel-gfx@lists.freedesktop.org +Description: RO. Fan speed of device in RPM. + + Only supported for particular Intel i915 graphics platforms. diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h index e42b3a5d4e63..57a3c83d3655 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h @@ -1553,6 +1553,8 @@ #define VLV_RENDER_C0_COUNT _MMIO(0x138118) #define VLV_MEDIA_C0_COUNT _MMIO(0x13811c) +#define PCU_PWM_FAN_SPEED _MMIO(0x138140) + #define GEN12_RPSTAT1 _MMIO(0x1381b4) #define GEN12_VOLTAGE_MASK REG_GENMASK(10, 0) #define GEN12_CAGF_MASK REG_GENMASK(19, 11) diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index 49db3e09826c..17d30f6b84b0 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -5,6 +5,7 @@ #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> +#include <linux/jiffies.h> #include <linux/types.h> #include "i915_drv.h" @@ -36,6 +37,7 @@ struct hwm_reg { i915_reg_t pkg_rapl_limit; i915_reg_t energy_status_all; i915_reg_t energy_status_tile; + i915_reg_t fan_speed; }; struct hwm_energy_info { @@ -43,11 +45,17 @@ struct hwm_energy_info { long accum_energy; /* Accumulated energy for energy1_input */ }; +struct hwm_fan_info { + u32 reg_val_prev; + u64 time_prev; +}; + struct hwm_drvdata { struct i915_hwmon *hwmon; struct intel_uncore *uncore; struct device *hwmon_dev; struct hwm_energy_info ei; /* Energy info for energy1_input */ + struct hwm_fan_info fi; /* Fan info for fan1_input */ char name[12]; int gt_n; bool reset_in_progress; @@ -276,6 +284,7 @@ static const struct hwmon_channel_info * const hwm_info[] = { HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX | HWMON_P_CRIT), HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT), HWMON_CHANNEL_INFO(curr, HWMON_C_CRIT), + HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT), NULL }; @@ -613,6 +622,69 @@ hwm_curr_write(struct hwm_drvdata *ddat, u32 attr, long val) } } +static umode_t +hwm_fan_is_visible(const struct hwm_drvdata *ddat, u32 attr) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + + if (attr == hwmon_fan_input && i915_mmio_reg_valid(hwmon->rg.fan_speed)) + return 0444; + + return 0; +} + +static int +hwm_fan_input_read(struct hwm_drvdata *ddat, long *val) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + struct hwm_fan_info *fi = &ddat->fi; + u64 rotations, time_now, time; + intel_wakeref_t wakeref; + u32 reg_val; + int ret = 0; + + wakeref = intel_runtime_pm_get(ddat->uncore->rpm); + mutex_lock(&hwmon->hwmon_lock); + + reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.fan_speed); + time_now = get_jiffies_64(); + + /* + * HW register value is accumulated count of pulses from + * PWM fan with the scale of 2 pulses per rotation. + */ + rotations = (reg_val - fi->reg_val_prev) / 2; + + time = jiffies_delta_to_msecs(time_now - fi->time_prev); + if (unlikely(!time)) { + ret = -EAGAIN; + goto exit; + } + + /* + * Calculate fan speed in RPM by time averaging two subsequent + * readings in minutes. + * RPM = number of rotations * msecs per minute / time in msecs + */ + *val = DIV_ROUND_UP_ULL(rotations * (MSEC_PER_SEC * 60), time); + + fi->reg_val_prev = reg_val; + fi->time_prev = time_now; +exit: + mutex_unlock(&hwmon->hwmon_lock); + intel_runtime_pm_put(ddat->uncore->rpm, wakeref); + return ret; +} + +static int +hwm_fan_read(struct hwm_drvdata *ddat, u32 attr, long *val) +{ + if (attr == hwmon_fan_input) + return hwm_fan_input_read(ddat, val); + + return -EOPNOTSUPP; +} + static umode_t hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) @@ -628,6 +700,8 @@ hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, return hwm_energy_is_visible(ddat, attr); case hwmon_curr: return hwm_curr_is_visible(ddat, attr); + case hwmon_fan: + return hwm_fan_is_visible(ddat, attr); default: return 0; } @@ -648,6 +722,8 @@ hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, return hwm_energy_read(ddat, attr, val); case hwmon_curr: return hwm_curr_read(ddat, attr, val); + case hwmon_fan: + return hwm_fan_read(ddat, attr, val); default: return -EOPNOTSUPP; } @@ -739,12 +815,14 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT; hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS; hwmon->rg.energy_status_tile = INVALID_MMIO_REG; + hwmon->rg.fan_speed = PCU_PWM_FAN_SPEED; } else { hwmon->rg.pkg_power_sku_unit = INVALID_MMIO_REG; hwmon->rg.pkg_power_sku = INVALID_MMIO_REG; hwmon->rg.pkg_rapl_limit = INVALID_MMIO_REG; hwmon->rg.energy_status_all = INVALID_MMIO_REG; hwmon->rg.energy_status_tile = INVALID_MMIO_REG; + hwmon->rg.fan_speed = INVALID_MMIO_REG; } with_intel_runtime_pm(uncore->rpm, wakeref) { @@ -755,6 +833,16 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku_unit)) val_sku_unit = intel_uncore_read(uncore, hwmon->rg.pkg_power_sku_unit); + + /* + * Store the initial fan register value, so that we can use it for + * initial fan speed calculation. + */ + if (i915_mmio_reg_valid(hwmon->rg.fan_speed)) { + ddat->fi.reg_val_prev = intel_uncore_read(uncore, + hwmon->rg.fan_speed); + ddat->fi.time_prev = get_jiffies_64(); + } } hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit);
Add hwmon support for fan1_input attribute, which will expose fan speed in RPM. With this in place we can monitor fan speed using lm-sensors tool. $ sensors i915-pci-0300 Adapter: PCI adapter in0: 653.00 mV fan1: 3833 RPM power1: N/A (max = 43.00 W) energy1: 32.02 kJ v2: Handle overflow, add mutex protection and ABI documentation Aesthetic adjustments (Riana) v3: Change rotations data type, ABI date and version v4: Fix wakeref leak Drop switch case and simplify hwm_fan_xx() (Andi) v5: Rework time calculation, aesthetic adjustments (Andy) v6: Drop redundant overflow logic (Andy) Split fan_input_read() into dedicated helper (Badal) v7: Fix undefined reference to __udivdi3 for i386 (Andy) Signed-off-by: Raag Jadav <raag.jadav@intel.com> Reviewed-by: Riana Tauro <riana.tauro@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> --- .../ABI/testing/sysfs-driver-intel-i915-hwmon | 8 ++ drivers/gpu/drm/i915/gt/intel_gt_regs.h | 2 + drivers/gpu/drm/i915/i915_hwmon.c | 88 +++++++++++++++++++ 3 files changed, 98 insertions(+)