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drm/i915/hwmon: Show device level energy usage

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Use i915 HWMON to display device level energy input.

v2: Updated the date and kernel version in feature description
v3:
  - Cleaned up hwm_energy function and removed unused function
    i915_hwmon_energy_status_get (Ashutosh)
v4: KernelVersion: 6.2, Date: February 2023 in doc (Tvrtko)
v5: Change contact to intel-gfx (Rodrigo)
    Change return type of hwm_energy to void (Andi)

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>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221013154526.2105579-5-ashutosh.dixit@intel.com
This commit is contained in:
Dale B Stimson 2022-10-13 08:45:23 -07:00 committed by Anshuman Gupta
parent 99f55efb79
commit c41b8bdcc2
3 changed files with 114 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon
View file

@ -25,3 +25,11 @@ Contact: intel-gfx@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: February 2023
KernelVersion: 6.2
Contact: intel-gfx@lists.freedesktop.org
Description: RO. Energy input of device in microjoules.
Only supported for particular Intel i915 graphics platforms.

106
drivers/gpu/drm/i915/i915_hwmon.c
View file

@ -17,21 +17,30 @@
* SF_* - scale factors for particular quantities according to hwmon spec.
* - voltage - millivolts
* - power - microwatts
* - energy - microjoules
*/
#define SF_VOLTAGE 1000
#define SF_POWER 1000000
#define SF_ENERGY 1000000
struct hwm_reg {
i915_reg_t gt_perf_status;
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];
};
@ -40,6 +49,7 @@ struct i915_hwmon {
struct mutex hwmon_lock; /* counter overflow logic and rmw */
struct hwm_reg rg;
int scl_shift_power;
int scl_shift_energy;
};
static void
@ -98,9 +108,58 @@ 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 void
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;
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);
}
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
};
@ -194,6 +253,33 @@ 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:
hwm_energy(ddat, val);
return 0;
default:
return -EOPNOTSUPP;
}
}
static umode_t
hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type,
u32 attr, int channel)
@ -205,6 +291,8 @@ 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;
}
@ -221,6 +309,8 @@ 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;
}
@ -256,8 +346,10 @@ 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 = 0;
long energy;
/* Available for all Gen12+/dGfx */
hwmon->rg.gt_perf_status = GEN12_RPSTAT1;
@ -266,10 +358,12 @@ hwm_get_preregistration_info(struct drm_i915_private *i915)
hwmon->rg.pkg_power_sku_unit = PCU_PACKAGE_POWER_SKU_UNIT;
hwmon->rg.pkg_power_sku = PCU_PACKAGE_POWER_SKU;
hwmon->rg.pkg_rapl_limit = PCU_PACKAGE_RAPL_LIMIT;
hwmon->rg.energy_status_all = PCU_PACKAGE_ENERGY_STATUS;
} 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;
}
with_intel_runtime_pm(uncore->rpm, wakeref) {
@ -280,9 +374,17 @@ 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);
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)

2
drivers/gpu/drm/i915/intel_mchbar_regs.h
View file

@ -197,7 +197,9 @@
#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)