| Message ID | 20220812173715.2398586-5-badal.nilawar@intel.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | drm/i915: Add HWMON support | expand |
On 8/12/22 10:37, Badal Nilawar wrote: > From: Dale B Stimson <dale.b.stimson@intel.com> > > Use i915 HWMON to display device level energy input. > > v2: > - Updated the date and kernel version in feature description > > Signed-off-by: Dale B Stimson <dale.b.stimson@intel.com> > Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> > Signed-off-by: Riana Tauro <riana.tauro@intel.com> > Signed-off-by: Badal Nilawar <badal.nilawar@intel.com> Acked-by: Guenter Roeck <linux@roeck-us.net> > --- > .../ABI/testing/sysfs-driver-intel-i915-hwmon | 8 ++ > drivers/gpu/drm/i915/i915_hwmon.c | 119 +++++++++++++++++- > drivers/gpu/drm/i915/i915_hwmon.h | 1 + > drivers/gpu/drm/i915/intel_mchbar_regs.h | 2 + > 4 files changed, 128 insertions(+), 2 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > index 9a2d10edfce8..03d71c6869d3 100644 > --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > @@ -25,3 +25,11 @@ Contact: dri-devel@lists.freedesktop.org > Description: RO. Card default power limit (default TDP setting). > > Only supported for particular Intel i915 graphics platforms. > + > +What: /sys/devices/.../hwmon/hwmon<i>/energy1_input > +Date: June 2022 > +KernelVersion: 5.19 > +Contact: dri-devel@lists.freedesktop.org > +Description: RO. Energy input of device in microjoules. > + > + Only supported for particular Intel i915 graphics platforms. > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c > index 2ce5bf94b220..416c77c89609 100644 > --- a/drivers/gpu/drm/i915/i915_hwmon.c > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > @@ -15,8 +15,10 @@ > /* > * SF_* - scale factors for particular quantities according to hwmon spec. > * - power - microwatts > + * - energy - microjoules > */ > #define SF_POWER 1000000 > +#define SF_ENERGY 1000000 > > #define FIELD_SHIFT(__mask) \ > (BUILD_BUG_ON_ZERO(!__builtin_constant_p(__mask)) + \ > @@ -28,12 +30,19 @@ struct hwm_reg { > i915_reg_t pkg_power_sku_unit; > i915_reg_t pkg_power_sku; > i915_reg_t pkg_rapl_limit; > + i915_reg_t energy_status_all; > +}; > + > +struct hwm_energy_info { > + u32 reg_val_prev; > + long accum_energy; /* Accumulated energy for energy1_input */ > }; > > 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 */ > char name[12]; > }; > > @@ -43,6 +52,7 @@ struct i915_hwmon { > struct hwm_reg rg; > u32 power_max_initial_value; > int scl_shift_power; > + int scl_shift_energy; > }; > > static void > @@ -102,9 +112,72 @@ hwm_field_scale_and_write(struct hwm_drvdata *ddat, i915_reg_t rgadr, > bits_to_clear, bits_to_set); > } > > +/* > + * hwm_energy - Obtain energy value > + * > + * The underlying energy hardware register is 32-bits and is subject to > + * overflow. How long before overflow? For example, with an example > + * scaling bit shift of 14 bits (see register *PACKAGE_POWER_SKU_UNIT) and > + * a power draw of 1000 watts, the 32-bit counter will overflow in > + * approximately 4.36 minutes. > + * > + * Examples: > + * 1 watt: (2^32 >> 14) / 1 W / (60 * 60 * 24) secs/day -> 3 days > + * 1000 watts: (2^32 >> 14) / 1000 W / 60 secs/min -> 4.36 minutes > + * > + * The function significantly increases overflow duration (from 4.36 > + * minutes) by accumulating the energy register into a 'long' as allowed by > + * the hwmon API. Using x86_64 128 bit arithmetic (see mul_u64_u32_shr()), > + * a 'long' of 63 bits, SF_ENERGY of 1e6 (~20 bits) and > + * hwmon->scl_shift_energy of 14 bits we have 57 (63 - 20 + 14) bits before > + * energy1_input overflows. This at 1000 W is an overflow duration of 278 years. > + */ > +static int > +hwm_energy(struct hwm_drvdata *ddat, long *energy) > +{ > + struct intel_uncore *uncore = ddat->uncore; > + struct i915_hwmon *hwmon = ddat->hwmon; > + struct hwm_energy_info *ei = &ddat->ei; > + intel_wakeref_t wakeref; > + i915_reg_t rgaddr; > + u32 reg_val; > + > + rgaddr = hwmon->rg.energy_status_all; > + > + if (!i915_mmio_reg_valid(rgaddr)) > + return -EOPNOTSUPP; > + > + mutex_lock(&hwmon->hwmon_lock); > + > + with_intel_runtime_pm(uncore->rpm, wakeref) > + reg_val = intel_uncore_read(uncore, rgaddr); > + > + if (reg_val >= ei->reg_val_prev) > + ei->accum_energy += reg_val - ei->reg_val_prev; > + else > + ei->accum_energy += UINT_MAX - ei->reg_val_prev + reg_val; > + ei->reg_val_prev = reg_val; > + > + *energy = mul_u64_u32_shr(ei->accum_energy, SF_ENERGY, > + hwmon->scl_shift_energy); > + mutex_unlock(&hwmon->hwmon_lock); > + > + return 0; > +} > + > +int > +i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy) > +{ > + struct i915_hwmon *hwmon = i915->hwmon; > + struct hwm_drvdata *ddat = &hwmon->ddat; > + > + return hwm_energy(ddat, energy); > +} > + > static const struct hwmon_channel_info *hwm_info[] = { > HWMON_CHANNEL_INFO(in, HWMON_I_INPUT), > HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX), > + HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT), > NULL > }; > > @@ -199,6 +272,32 @@ hwm_power_write(struct hwm_drvdata *ddat, u32 attr, int chan, long val) > } > } > > +static umode_t > +hwm_energy_is_visible(const struct hwm_drvdata *ddat, u32 attr) > +{ > + struct i915_hwmon *hwmon = ddat->hwmon; > + i915_reg_t rgaddr; > + > + switch (attr) { > + case hwmon_energy_input: > + rgaddr = hwmon->rg.energy_status_all; > + return i915_mmio_reg_valid(rgaddr) ? 0444 : 0; > + default: > + return 0; > + } > +} > + > +static int > +hwm_energy_read(struct hwm_drvdata *ddat, u32 attr, long *val) > +{ > + switch (attr) { > + case hwmon_energy_input: > + return hwm_energy(ddat, val); > + default: > + return -EOPNOTSUPP; > + } > +} > + > static umode_t > hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > u32 attr, int channel) > @@ -210,6 +309,8 @@ hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > return hwm_in_is_visible(ddat, attr); > case hwmon_power: > return hwm_power_is_visible(ddat, attr, channel); > + case hwmon_energy: > + return hwm_energy_is_visible(ddat, attr); > default: > return 0; > } > @@ -226,6 +327,8 @@ hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, > return hwm_in_read(ddat, attr, val); > case hwmon_power: > return hwm_power_read(ddat, attr, channel, val); > + case hwmon_energy: > + return hwm_energy_read(ddat, attr, val); > default: > return -EOPNOTSUPP; > } > @@ -261,19 +364,23 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) > { > struct i915_hwmon *hwmon = i915->hwmon; > struct intel_uncore *uncore = &i915->uncore; > + struct hwm_drvdata *ddat = &hwmon->ddat; > intel_wakeref_t wakeref; > u32 val_sku_unit; > + long energy; > > if (IS_DG1(i915) || IS_DG2(i915)) { > hwmon->rg.gt_perf_status = GEN12_RPSTAT1; > hwmon->rg.pkg_power_sku_unit = PCU_PACKAGE_POWER_SKU_UNIT; > hwmon->rg.pkg_power_sku = INVALID_MMIO_REG; > hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT; > + hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS; > } else { > hwmon->rg.gt_perf_status = INVALID_MMIO_REG; > 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; > } > > with_intel_runtime_pm(uncore->rpm, wakeref) { > @@ -291,9 +398,17 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) > } else { > val_sku_unit = 0; > } > - > - hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit); > } > + > + hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit); > + hwmon->scl_shift_energy = REG_FIELD_GET(PKG_ENERGY_UNIT, val_sku_unit); > + > + /* > + * Initialize 'struct hwm_energy_info', i.e. set fields to the > + * first value of the energy register read > + */ > + if (i915_mmio_reg_valid(hwmon->rg.energy_status_all)) > + hwm_energy(ddat, &energy); > } > > void i915_hwmon_register(struct drm_i915_private *i915) > diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h > index 921ae76099d3..d5d7f4a0bf4e 100644 > --- a/drivers/gpu/drm/i915/i915_hwmon.h > +++ b/drivers/gpu/drm/i915/i915_hwmon.h > @@ -17,4 +17,5 @@ struct drm_i915_private; > void i915_hwmon_register(struct drm_i915_private *i915); > void i915_hwmon_unregister(struct drm_i915_private *i915); > > +int i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy); > #endif /* __I915_HWMON_H__ */ > diff --git a/drivers/gpu/drm/i915/intel_mchbar_regs.h b/drivers/gpu/drm/i915/intel_mchbar_regs.h > index 4ba5f30b7901..18fcfc39ca2f 100644 > --- a/drivers/gpu/drm/i915/intel_mchbar_regs.h > +++ b/drivers/gpu/drm/i915/intel_mchbar_regs.h > @@ -191,7 +191,9 @@ > > #define PCU_PACKAGE_POWER_SKU_UNIT _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5938) > #define PKG_PWR_UNIT REG_GENMASK(3, 0) > +#define PKG_ENERGY_UNIT REG_GENMASK(12, 8) > #define PKG_TIME_UNIT REG_GENMASK(19, 16) > +#define PCU_PACKAGE_ENERGY_STATUS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x593c) > > #define GEN6_GT_PERF_STATUS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5948) > #define GEN6_RP_STATE_LIMITS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5994)
diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon index 9a2d10edfce8..03d71c6869d3 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon @@ -25,3 +25,11 @@ Contact: dri-devel@lists.freedesktop.org Description: RO. Card default power limit (default TDP setting). Only supported for particular Intel i915 graphics platforms. + +What: /sys/devices/.../hwmon/hwmon<i>/energy1_input +Date: June 2022 +KernelVersion: 5.19 +Contact: dri-devel@lists.freedesktop.org +Description: RO. Energy input of device in microjoules. + + Only supported for particular Intel i915 graphics platforms. diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index 2ce5bf94b220..416c77c89609 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -15,8 +15,10 @@ /* * SF_* - scale factors for particular quantities according to hwmon spec. * - power - microwatts + * - energy - microjoules */ #define SF_POWER 1000000 +#define SF_ENERGY 1000000 #define FIELD_SHIFT(__mask) \ (BUILD_BUG_ON_ZERO(!__builtin_constant_p(__mask)) + \ @@ -28,12 +30,19 @@ struct hwm_reg { i915_reg_t pkg_power_sku_unit; i915_reg_t pkg_power_sku; i915_reg_t pkg_rapl_limit; + i915_reg_t energy_status_all; +}; + +struct hwm_energy_info { + u32 reg_val_prev; + long accum_energy; /* Accumulated energy for energy1_input */ }; 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 */ char name[12]; }; @@ -43,6 +52,7 @@ struct i915_hwmon { struct hwm_reg rg; u32 power_max_initial_value; int scl_shift_power; + int scl_shift_energy; }; static void @@ -102,9 +112,72 @@ hwm_field_scale_and_write(struct hwm_drvdata *ddat, i915_reg_t rgadr, bits_to_clear, bits_to_set); } +/* + * hwm_energy - Obtain energy value + * + * The underlying energy hardware register is 32-bits and is subject to + * overflow. How long before overflow? For example, with an example + * scaling bit shift of 14 bits (see register *PACKAGE_POWER_SKU_UNIT) and + * a power draw of 1000 watts, the 32-bit counter will overflow in + * approximately 4.36 minutes. + * + * Examples: + * 1 watt: (2^32 >> 14) / 1 W / (60 * 60 * 24) secs/day -> 3 days + * 1000 watts: (2^32 >> 14) / 1000 W / 60 secs/min -> 4.36 minutes + * + * The function significantly increases overflow duration (from 4.36 + * minutes) by accumulating the energy register into a 'long' as allowed by + * the hwmon API. Using x86_64 128 bit arithmetic (see mul_u64_u32_shr()), + * a 'long' of 63 bits, SF_ENERGY of 1e6 (~20 bits) and + * hwmon->scl_shift_energy of 14 bits we have 57 (63 - 20 + 14) bits before + * energy1_input overflows. This at 1000 W is an overflow duration of 278 years. + */ +static int +hwm_energy(struct hwm_drvdata *ddat, long *energy) +{ + struct intel_uncore *uncore = ddat->uncore; + struct i915_hwmon *hwmon = ddat->hwmon; + struct hwm_energy_info *ei = &ddat->ei; + intel_wakeref_t wakeref; + i915_reg_t rgaddr; + u32 reg_val; + + rgaddr = hwmon->rg.energy_status_all; + + if (!i915_mmio_reg_valid(rgaddr)) + return -EOPNOTSUPP; + + mutex_lock(&hwmon->hwmon_lock); + + with_intel_runtime_pm(uncore->rpm, wakeref) + reg_val = intel_uncore_read(uncore, rgaddr); + + if (reg_val >= ei->reg_val_prev) + ei->accum_energy += reg_val - ei->reg_val_prev; + else + ei->accum_energy += UINT_MAX - ei->reg_val_prev + reg_val; + ei->reg_val_prev = reg_val; + + *energy = mul_u64_u32_shr(ei->accum_energy, SF_ENERGY, + hwmon->scl_shift_energy); + mutex_unlock(&hwmon->hwmon_lock); + + return 0; +} + +int +i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy) +{ + struct i915_hwmon *hwmon = i915->hwmon; + struct hwm_drvdata *ddat = &hwmon->ddat; + + return hwm_energy(ddat, energy); +} + static const struct hwmon_channel_info *hwm_info[] = { HWMON_CHANNEL_INFO(in, HWMON_I_INPUT), HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX), + HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT), NULL }; @@ -199,6 +272,32 @@ hwm_power_write(struct hwm_drvdata *ddat, u32 attr, int chan, long val) } } +static umode_t +hwm_energy_is_visible(const struct hwm_drvdata *ddat, u32 attr) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + i915_reg_t rgaddr; + + switch (attr) { + case hwmon_energy_input: + rgaddr = hwmon->rg.energy_status_all; + return i915_mmio_reg_valid(rgaddr) ? 0444 : 0; + default: + return 0; + } +} + +static int +hwm_energy_read(struct hwm_drvdata *ddat, u32 attr, long *val) +{ + switch (attr) { + case hwmon_energy_input: + return hwm_energy(ddat, val); + default: + return -EOPNOTSUPP; + } +} + static umode_t hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) @@ -210,6 +309,8 @@ hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, return hwm_in_is_visible(ddat, attr); case hwmon_power: return hwm_power_is_visible(ddat, attr, channel); + case hwmon_energy: + return hwm_energy_is_visible(ddat, attr); default: return 0; } @@ -226,6 +327,8 @@ hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, return hwm_in_read(ddat, attr, val); case hwmon_power: return hwm_power_read(ddat, attr, channel, val); + case hwmon_energy: + return hwm_energy_read(ddat, attr, val); default: return -EOPNOTSUPP; } @@ -261,19 +364,23 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) { struct i915_hwmon *hwmon = i915->hwmon; struct intel_uncore *uncore = &i915->uncore; + struct hwm_drvdata *ddat = &hwmon->ddat; intel_wakeref_t wakeref; u32 val_sku_unit; + long energy; if (IS_DG1(i915) || IS_DG2(i915)) { hwmon->rg.gt_perf_status = GEN12_RPSTAT1; hwmon->rg.pkg_power_sku_unit = PCU_PACKAGE_POWER_SKU_UNIT; hwmon->rg.pkg_power_sku = INVALID_MMIO_REG; hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT; + hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS; } else { hwmon->rg.gt_perf_status = INVALID_MMIO_REG; 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; } with_intel_runtime_pm(uncore->rpm, wakeref) { @@ -291,9 +398,17 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) } else { val_sku_unit = 0; } - - hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit); } + + hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit); + hwmon->scl_shift_energy = REG_FIELD_GET(PKG_ENERGY_UNIT, val_sku_unit); + + /* + * Initialize 'struct hwm_energy_info', i.e. set fields to the + * first value of the energy register read + */ + if (i915_mmio_reg_valid(hwmon->rg.energy_status_all)) + hwm_energy(ddat, &energy); } void i915_hwmon_register(struct drm_i915_private *i915) diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h index 921ae76099d3..d5d7f4a0bf4e 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.h +++ b/drivers/gpu/drm/i915/i915_hwmon.h @@ -17,4 +17,5 @@ struct drm_i915_private; void i915_hwmon_register(struct drm_i915_private *i915); void i915_hwmon_unregister(struct drm_i915_private *i915); +int i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy); #endif /* __I915_HWMON_H__ */ diff --git a/drivers/gpu/drm/i915/intel_mchbar_regs.h b/drivers/gpu/drm/i915/intel_mchbar_regs.h index 4ba5f30b7901..18fcfc39ca2f 100644 --- a/drivers/gpu/drm/i915/intel_mchbar_regs.h +++ b/drivers/gpu/drm/i915/intel_mchbar_regs.h @@ -191,7 +191,9 @@ #define PCU_PACKAGE_POWER_SKU_UNIT _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5938) #define PKG_PWR_UNIT REG_GENMASK(3, 0) +#define PKG_ENERGY_UNIT REG_GENMASK(12, 8) #define PKG_TIME_UNIT REG_GENMASK(19, 16) +#define PCU_PACKAGE_ENERGY_STATUS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x593c) #define GEN6_GT_PERF_STATUS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5948) #define GEN6_RP_STATE_LIMITS _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5994)