| Message ID | 20220812173715.2398586-7-badal.nilawar@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915: Add HWMON support | expand |
On 8/12/22 10:37, Badal Nilawar wrote: > From: Ashutosh Dixit <ashutosh.dixit@intel.com> > > Expose power1_max_interval, that is the tau corresponding to PL1. Some bit > manipulation is needed because of the format of PKG_PWR_LIM_1_TIME in > GT0_PACKAGE_RAPL_LIMIT register (1.x * power(2,y)). > > v2: Update date and kernel version in Documentation (Badal) > > Signed-off-by: Ashutosh Dixit <ashutosh.dixit@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 | 9 ++ > drivers/gpu/drm/i915/i915_hwmon.c | 128 +++++++++++++++++- > drivers/gpu/drm/i915/i915_reg.h | 4 +- > drivers/gpu/drm/i915/intel_mchbar_regs.h | 4 + > 4 files changed, 142 insertions(+), 3 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > index bb1101757154..34668f6c2dc4 100644 > --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > @@ -26,6 +26,15 @@ Description: RO. Card default power limit (default TDP setting). > > Only supported for particular Intel i915 graphics platforms. > > +What: /sys/devices/.../hwmon/hwmon<i>/power1_max_interval > +Date: June 2022 > +KernelVersion: 5.19 > +Contact: dri-devel@lists.freedesktop.org > +Description: RW. Sustained power limit interval (Tau in PL1/Tau) in > + milliseconds over which sustained power is averaged. > + > + Only supported for particular Intel i915 graphics platforms. > + > What: /sys/devices/.../hwmon/hwmon<i>/power1_crit > Date: June 2022 > KernelVersion: 5.19 > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c > index b1a89a6aa220..6760133c7905 100644 > --- a/drivers/gpu/drm/i915/i915_hwmon.c > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > @@ -15,10 +15,12 @@ > > /* > * SF_* - scale factors for particular quantities according to hwmon spec. > + * - time - milliseconds > * - power - microwatts > * - curr - milliamperes > * - energy - microjoules > */ > +#define SF_TIME 1000 > #define SF_POWER 1000000 > #define SF_CURR 1000 > #define SF_ENERGY 1000000 > @@ -56,6 +58,7 @@ struct i915_hwmon { > u32 power_max_initial_value; > int scl_shift_power; > int scl_shift_energy; > + int scl_shift_time; > }; > > static void > @@ -177,6 +180,128 @@ i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy) > return hwm_energy(ddat, energy); > } > > +static ssize_t > +hwm_power1_max_interval_show(struct device *dev, struct device_attribute *attr, > + char *buf) > +{ > + struct hwm_drvdata *ddat = dev_get_drvdata(dev); > + struct i915_hwmon *hwmon = ddat->hwmon; > + intel_wakeref_t wakeref; > + u32 r, x, y, x_w = 2; /* 2 bits */ > + u64 tau4, out; > + > + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) > + r = intel_uncore_read(ddat->uncore, hwmon->rg.pkg_rapl_limit); > + > + x = REG_FIELD_GET(PKG_PWR_LIM_1_TIME_X, r); > + y = REG_FIELD_GET(PKG_PWR_LIM_1_TIME_Y, r); > + /* > + * tau = 1.x * power(2,y), x = bits(23:22), y = bits(21:17) > + * = (4 | x) << (y - 2) > + * where (y - 2) ensures a 1.x fixed point representation of 1.x > + * However because y can be < 2, we compute > + * tau4 = (4 | x) << y > + * but add 2 when doing the final right shift to account for units > + */ > + tau4 = ((1 << x_w) | x) << y; > + /* val in hwmon interface units (millisec) */ > + out = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + x_w); > + > + return sysfs_emit(buf, "%llu\n", out); > +} > + > +static ssize_t > +hwm_power1_max_interval_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct hwm_drvdata *ddat = dev_get_drvdata(dev); > + struct i915_hwmon *hwmon = ddat->hwmon; > + long val, max_win, ret; > + u32 x, y, rxy, x_w = 2; /* 2 bits */ > + intel_wakeref_t wakeref; > + u64 tau4, r; > + > +#define PKG_MAX_WIN_DEFAULT 0x12ull > + > + ret = kstrtoul(buf, 0, &val); > + if (ret) > + return ret; > + > + /* val must be < max in hwmon interface units */ > + if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku)) { > + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) > + r = intel_uncore_read64(ddat->uncore, hwmon->rg.pkg_power_sku); > + /* > + * FIXME > + * Wa_22015381490:pvc rg.pkg_power_sku value is incorrect on PVC > + * at least. The following seems to work: > + * r <<= 8; > + * However for now to be safe just use the default value > + * below. Once issue is resolved remove the one line below. > + */ > + r = FIELD_PREP(PKG_MAX_WIN, PKG_MAX_WIN_DEFAULT); > + } else { > + r = FIELD_PREP(PKG_MAX_WIN, PKG_MAX_WIN_DEFAULT); > + } > + > + /* Steps below are explained in i915_power1_max_interval_show() */ > + x = REG_FIELD_GET(PKG_MAX_WIN_X, r); > + y = REG_FIELD_GET(PKG_MAX_WIN_Y, r); > + tau4 = ((1 << x_w) | x) << y; > + max_win = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + x_w); > + > + if (val > max_win) > + return -EINVAL; > + > + /* val in hw units */ > + val = DIV_ROUND_CLOSEST_ULL((u64)val << hwmon->scl_shift_time, SF_TIME); > + /* Convert to 1.x * power(2,y) */ > + if (!val) > + return -EINVAL; > + y = ilog2(val); > + /* x = (val - (1 << y)) >> (y - 2); */ > + x = (val - (1ul << y)) << x_w >> y; > + > + rxy = REG_FIELD_PREP(PKG_PWR_LIM_1_TIME_X, x) | REG_FIELD_PREP(PKG_PWR_LIM_1_TIME_Y, y); > + > + hwm_locked_with_pm_intel_uncore_rmw(ddat, hwmon->rg.pkg_rapl_limit, > + PKG_PWR_LIM_1_TIME, rxy); > + return count; > +} > + > +static SENSOR_DEVICE_ATTR(power1_max_interval, 0664, > + hwm_power1_max_interval_show, > + hwm_power1_max_interval_store, 0); > + > +static struct attribute *hwm_attributes[] = { > + &sensor_dev_attr_power1_max_interval.dev_attr.attr, > + NULL > +}; > + > +static umode_t hwm_attributes_visible(struct kobject *kobj, > + struct attribute *attr, int index) > +{ > + struct device *dev = kobj_to_dev(kobj); > + struct hwm_drvdata *ddat = dev_get_drvdata(dev); > + struct i915_hwmon *hwmon = ddat->hwmon; > + > + if (attr == &sensor_dev_attr_power1_max_interval.dev_attr.attr) > + return i915_mmio_reg_valid(hwmon->rg.pkg_rapl_limit) ? attr->mode : 0; > + else > + return 0; > +} > + > +static const struct attribute_group hwm_attrgroup = { > + .attrs = hwm_attributes, > + .is_visible = hwm_attributes_visible, > +}; > + > +static const struct attribute_group *hwm_groups[] = { > + &hwm_attrgroup, > + NULL > +}; > + > 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_P_CRIT), > @@ -495,6 +620,7 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) > > 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); > + hwmon->scl_shift_time = REG_FIELD_GET(PKG_TIME_UNIT, val_sku_unit); > > /* > * Initialize 'struct hwm_energy_info', i.e. set fields to the > @@ -533,7 +659,7 @@ void i915_hwmon_register(struct drm_i915_private *i915) > hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, > ddat, > &hwm_chip_info, > - NULL); > + hwm_groups); > if (IS_ERR(hwmon_dev)) { > mutex_destroy(&hwmon->hwmon_lock); > i915->hwmon = NULL; > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 041b858b95f4..05db98252a2f 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -1879,8 +1879,8 @@ > #define PKG_MIN_PWR GENMASK_ULL(30, 16) > #define PKG_MAX_PWR GENMASK_ULL(46, 32) > #define PKG_MAX_WIN GENMASK_ULL(54, 48) > -#define PKG_MAX_WIN_Y GENMASK_ULL(54, 53) > -#define PKG_MAX_WIN_X GENMASK_ULL(52, 48) > +#define PKG_MAX_WIN_X GENMASK_ULL(54, 53) > +#define PKG_MAX_WIN_Y GENMASK_ULL(52, 48) > > #define CHV_CLK_CTL1 _MMIO(0x101100) > #define VLV_CLK_CTL2 _MMIO(0x101104) > diff --git a/drivers/gpu/drm/i915/intel_mchbar_regs.h b/drivers/gpu/drm/i915/intel_mchbar_regs.h > index 18fcfc39ca2f..930cb4d76bbb 100644 > --- a/drivers/gpu/drm/i915/intel_mchbar_regs.h > +++ b/drivers/gpu/drm/i915/intel_mchbar_regs.h > @@ -204,6 +204,10 @@ > > #define PCU_PACKAGE_RAPL_LIMIT _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x59a0) > #define PKG_PWR_LIM_1 REG_GENMASK(14, 0) > +#define PKG_PWR_LIM_1_EN REG_BIT(15) > +#define PKG_PWR_LIM_1_TIME REG_GENMASK(23, 17) > +#define PKG_PWR_LIM_1_TIME_X REG_GENMASK(23, 22) > +#define PKG_PWR_LIM_1_TIME_Y REG_GENMASK(21, 17) > > /* snb MCH registers for priority tuning */ > #define MCH_SSKPD _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5d10)
diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon index bb1101757154..34668f6c2dc4 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon @@ -26,6 +26,15 @@ Description: RO. Card default power limit (default TDP setting). Only supported for particular Intel i915 graphics platforms. +What: /sys/devices/.../hwmon/hwmon<i>/power1_max_interval +Date: June 2022 +KernelVersion: 5.19 +Contact: dri-devel@lists.freedesktop.org +Description: RW. Sustained power limit interval (Tau in PL1/Tau) in + milliseconds over which sustained power is averaged. + + Only supported for particular Intel i915 graphics platforms. + What: /sys/devices/.../hwmon/hwmon<i>/power1_crit Date: June 2022 KernelVersion: 5.19 diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index b1a89a6aa220..6760133c7905 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -15,10 +15,12 @@ /* * SF_* - scale factors for particular quantities according to hwmon spec. + * - time - milliseconds * - power - microwatts * - curr - milliamperes * - energy - microjoules */ +#define SF_TIME 1000 #define SF_POWER 1000000 #define SF_CURR 1000 #define SF_ENERGY 1000000 @@ -56,6 +58,7 @@ struct i915_hwmon { u32 power_max_initial_value; int scl_shift_power; int scl_shift_energy; + int scl_shift_time; }; static void @@ -177,6 +180,128 @@ i915_hwmon_energy_status_get(struct drm_i915_private *i915, long *energy) return hwm_energy(ddat, energy); } +static ssize_t +hwm_power1_max_interval_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hwm_drvdata *ddat = dev_get_drvdata(dev); + struct i915_hwmon *hwmon = ddat->hwmon; + intel_wakeref_t wakeref; + u32 r, x, y, x_w = 2; /* 2 bits */ + u64 tau4, out; + + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) + r = intel_uncore_read(ddat->uncore, hwmon->rg.pkg_rapl_limit); + + x = REG_FIELD_GET(PKG_PWR_LIM_1_TIME_X, r); + y = REG_FIELD_GET(PKG_PWR_LIM_1_TIME_Y, r); + /* + * tau = 1.x * power(2,y), x = bits(23:22), y = bits(21:17) + * = (4 | x) << (y - 2) + * where (y - 2) ensures a 1.x fixed point representation of 1.x + * However because y can be < 2, we compute + * tau4 = (4 | x) << y + * but add 2 when doing the final right shift to account for units + */ + tau4 = ((1 << x_w) | x) << y; + /* val in hwmon interface units (millisec) */ + out = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + x_w); + + return sysfs_emit(buf, "%llu\n", out); +} + +static ssize_t +hwm_power1_max_interval_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct hwm_drvdata *ddat = dev_get_drvdata(dev); + struct i915_hwmon *hwmon = ddat->hwmon; + long val, max_win, ret; + u32 x, y, rxy, x_w = 2; /* 2 bits */ + intel_wakeref_t wakeref; + u64 tau4, r; + +#define PKG_MAX_WIN_DEFAULT 0x12ull + + ret = kstrtoul(buf, 0, &val); + if (ret) + return ret; + + /* val must be < max in hwmon interface units */ + if (i915_mmio_reg_valid(hwmon->rg.pkg_power_sku)) { + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) + r = intel_uncore_read64(ddat->uncore, hwmon->rg.pkg_power_sku); + /* + * FIXME + * Wa_22015381490:pvc rg.pkg_power_sku value is incorrect on PVC + * at least. The following seems to work: + * r <<= 8; + * However for now to be safe just use the default value + * below. Once issue is resolved remove the one line below. + */ + r = FIELD_PREP(PKG_MAX_WIN, PKG_MAX_WIN_DEFAULT); + } else { + r = FIELD_PREP(PKG_MAX_WIN, PKG_MAX_WIN_DEFAULT); + } + + /* Steps below are explained in i915_power1_max_interval_show() */ + x = REG_FIELD_GET(PKG_MAX_WIN_X, r); + y = REG_FIELD_GET(PKG_MAX_WIN_Y, r); + tau4 = ((1 << x_w) | x) << y; + max_win = mul_u64_u32_shr(tau4, SF_TIME, hwmon->scl_shift_time + x_w); + + if (val > max_win) + return -EINVAL; + + /* val in hw units */ + val = DIV_ROUND_CLOSEST_ULL((u64)val << hwmon->scl_shift_time, SF_TIME); + /* Convert to 1.x * power(2,y) */ + if (!val) + return -EINVAL; + y = ilog2(val); + /* x = (val - (1 << y)) >> (y - 2); */ + x = (val - (1ul << y)) << x_w >> y; + + rxy = REG_FIELD_PREP(PKG_PWR_LIM_1_TIME_X, x) | REG_FIELD_PREP(PKG_PWR_LIM_1_TIME_Y, y); + + hwm_locked_with_pm_intel_uncore_rmw(ddat, hwmon->rg.pkg_rapl_limit, + PKG_PWR_LIM_1_TIME, rxy); + return count; +} + +static SENSOR_DEVICE_ATTR(power1_max_interval, 0664, + hwm_power1_max_interval_show, + hwm_power1_max_interval_store, 0); + +static struct attribute *hwm_attributes[] = { + &sensor_dev_attr_power1_max_interval.dev_attr.attr, + NULL +}; + +static umode_t hwm_attributes_visible(struct kobject *kobj, + struct attribute *attr, int index) +{ + struct device *dev = kobj_to_dev(kobj); + struct hwm_drvdata *ddat = dev_get_drvdata(dev); + struct i915_hwmon *hwmon = ddat->hwmon; + + if (attr == &sensor_dev_attr_power1_max_interval.dev_attr.attr) + return i915_mmio_reg_valid(hwmon->rg.pkg_rapl_limit) ? attr->mode : 0; + else + return 0; +} + +static const struct attribute_group hwm_attrgroup = { + .attrs = hwm_attributes, + .is_visible = hwm_attributes_visible, +}; + +static const struct attribute_group *hwm_groups[] = { + &hwm_attrgroup, + NULL +}; + 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_P_CRIT), @@ -495,6 +620,7 @@ hwm_get_preregistration_info(struct drm_i915_private *i915) 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); + hwmon->scl_shift_time = REG_FIELD_GET(PKG_TIME_UNIT, val_sku_unit); /* * Initialize 'struct hwm_energy_info', i.e. set fields to the @@ -533,7 +659,7 @@ void i915_hwmon_register(struct drm_i915_private *i915) hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, ddat, &hwm_chip_info, - NULL); + hwm_groups); if (IS_ERR(hwmon_dev)) { mutex_destroy(&hwmon->hwmon_lock); i915->hwmon = NULL; diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 041b858b95f4..05db98252a2f 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1879,8 +1879,8 @@ #define PKG_MIN_PWR GENMASK_ULL(30, 16) #define PKG_MAX_PWR GENMASK_ULL(46, 32) #define PKG_MAX_WIN GENMASK_ULL(54, 48) -#define PKG_MAX_WIN_Y GENMASK_ULL(54, 53) -#define PKG_MAX_WIN_X GENMASK_ULL(52, 48) +#define PKG_MAX_WIN_X GENMASK_ULL(54, 53) +#define PKG_MAX_WIN_Y GENMASK_ULL(52, 48) #define CHV_CLK_CTL1 _MMIO(0x101100) #define VLV_CLK_CTL2 _MMIO(0x101104) diff --git a/drivers/gpu/drm/i915/intel_mchbar_regs.h b/drivers/gpu/drm/i915/intel_mchbar_regs.h index 18fcfc39ca2f..930cb4d76bbb 100644 --- a/drivers/gpu/drm/i915/intel_mchbar_regs.h +++ b/drivers/gpu/drm/i915/intel_mchbar_regs.h @@ -204,6 +204,10 @@ #define PCU_PACKAGE_RAPL_LIMIT _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x59a0) #define PKG_PWR_LIM_1 REG_GENMASK(14, 0) +#define PKG_PWR_LIM_1_EN REG_BIT(15) +#define PKG_PWR_LIM_1_TIME REG_GENMASK(23, 17) +#define PKG_PWR_LIM_1_TIME_X REG_GENMASK(23, 22) +#define PKG_PWR_LIM_1_TIME_Y REG_GENMASK(21, 17) /* snb MCH registers for priority tuning */ #define MCH_SSKPD _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5d10)