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drm/xe/hwmon: Expose hwmon energy attribute

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Expose hwmon energy attribute to show device level energy usage

v2:
  - %s/hwm_/hwmon_/
  - Convert enums to upper case
v3:
  - %s/hwmon_/xe_hwmon
  - Remove gt specific hwmon attributes
v4:
 - %s/REG_PKG_ENERGY_STATUS/REG_ENERGY_STATUS_ALL (Riana)
 - %s/hwmon_energy_info/xe_hwmon_energy_info (Riana)

Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Riana Tauro <riana.tauro@intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://lore.kernel.org/r/20230925081842.3566834-5-badal.nilawar@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Badal Nilawar 2023-09-25 13:48:41 +05:30 committed by Rodrigo Vivi
parent fbcdc9d3bf
commit 71d0a32524
4 changed files with 116 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
View File

@ -52,3 +52,10 @@ Description: RO. Current Voltage in millivolt.
Only supported for particular Intel xe graphics platforms.
What: /sys/devices/.../hwmon/hwmon<i>/energy1_input
Date: September 2023
KernelVersion: 6.5
Contact: intel-xe@lists.freedesktop.org
Description: RO. Energy input of device in microjoules.
Only supported for particular Intel xe graphics platforms.

2
drivers/gpu/drm/xe/regs/xe_gt_regs.h
View File

@ -414,8 +414,10 @@
#define XEHPC_BCS5_BCS6_INTR_MASK XE_REG(0x190118)
#define XEHPC_BCS7_BCS8_INTR_MASK XE_REG(0x19011c)
#define PVC_GT0_PACKAGE_ENERGY_STATUS XE_REG(0x281004)
#define PVC_GT0_PACKAGE_RAPL_LIMIT XE_REG(0x281008)
#define PVC_GT0_PACKAGE_POWER_SKU_UNIT XE_REG(0x281068)
#define PVC_GT0_PLATFORM_ENERGY_STATUS XE_REG(0x28106c)
#define PVC_GT0_PACKAGE_POWER_SKU XE_REG(0x281080)
#endif

3
drivers/gpu/drm/xe/regs/xe_mchbar_regs.h
View File

@ -25,6 +25,9 @@
#define PCU_CR_PACKAGE_POWER_SKU_UNIT XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x5938)
#define PKG_PWR_UNIT REG_GENMASK(3, 0)
#define PKG_ENERGY_UNIT REG_GENMASK(12, 8)
#define PCU_CR_PACKAGE_ENERGY_STATUS XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x593c)
#define PCU_CR_PACKAGE_RAPL_LIMIT XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x59a0)
#define PKG_PWR_LIM_1 REG_GENMASK(14, 0)

105
drivers/gpu/drm/xe/xe_hwmon.c
View File

@ -22,6 +22,7 @@ enum xe_hwmon_reg {
REG_PKG_POWER_SKU,
REG_PKG_POWER_SKU_UNIT,
REG_GT_PERF_STATUS,
REG_PKG_ENERGY_STATUS,
};
enum xe_hwmon_reg_operation {
@ -36,12 +37,20 @@ enum xe_hwmon_reg_operation {
#define SF_POWER 1000000 /* microwatts */
#define SF_CURR 1000 /* milliamperes */
#define SF_VOLTAGE 1000 /* millivolts */
#define SF_ENERGY 1000000 /* microjoules */
struct xe_hwmon_energy_info {
u32 reg_val_prev;
long accum_energy; /* Accumulated energy for energy1_input */
};
struct xe_hwmon {
struct device *hwmon_dev;
struct xe_gt *gt;
struct mutex hwmon_lock; /* rmw operations*/
int scl_shift_power;
int scl_shift_energy;
struct xe_hwmon_energy_info ei; /* Energy info for energy1_input */
};
static u32 xe_hwmon_get_reg(struct xe_hwmon *hwmon, enum xe_hwmon_reg hwmon_reg)
@ -72,6 +81,12 @@ static u32 xe_hwmon_get_reg(struct xe_hwmon *hwmon, enum xe_hwmon_reg hwmon_reg)
if (xe->info.platform == XE_DG2)
reg = GT_PERF_STATUS;
break;
case REG_PKG_ENERGY_STATUS:
if (xe->info.platform == XE_DG2)
reg = PCU_CR_PACKAGE_ENERGY_STATUS;
else if (xe->info.platform == XE_PVC)
reg = PVC_GT0_PLATFORM_ENERGY_STATUS;
break;
default:
drm_warn(&xe->drm, "Unknown xe hwmon reg id: %d\n", hwmon_reg);
break;
@ -194,10 +209,59 @@ static int xe_hwmon_power_rated_max_read(struct xe_hwmon *hwmon, long *value)
return 0;
}
/*
* xe_hwmon_energy_get - 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
xe_hwmon_energy_get(struct xe_hwmon *hwmon, long *energy)
{
struct xe_hwmon_energy_info *ei = &hwmon->ei;
u32 reg_val;
xe_device_mem_access_get(gt_to_xe(hwmon->gt));
mutex_lock(&hwmon->hwmon_lock);
xe_hwmon_process_reg(hwmon, REG_PKG_ENERGY_STATUS, REG_READ,
&reg_val, 0, 0);
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);
xe_device_mem_access_put(gt_to_xe(hwmon->gt));
}
static const struct hwmon_channel_info *hwmon_info[] = {
HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX | HWMON_P_CRIT),
HWMON_CHANNEL_INFO(curr, HWMON_C_CRIT),
HWMON_CHANNEL_INFO(in, HWMON_I_INPUT),
HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT),
NULL
};
@ -371,6 +435,29 @@ xe_hwmon_in_read(struct xe_hwmon *hwmon, u32 attr, long *val)
return ret;
}
static umode_t
xe_hwmon_energy_is_visible(struct xe_hwmon *hwmon, u32 attr)
{
switch (attr) {
case hwmon_energy_input:
return xe_hwmon_get_reg(hwmon, REG_PKG_ENERGY_STATUS) ? 0444 : 0;
default:
return 0;
}
}
static int
xe_hwmon_energy_read(struct xe_hwmon *hwmon, u32 attr, long *val)
{
switch (attr) {
case hwmon_energy_input:
xe_hwmon_energy_get(hwmon, val);
return 0;
default:
return -EOPNOTSUPP;
}
}
static umode_t
xe_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
u32 attr, int channel)
@ -390,6 +477,9 @@ xe_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
case hwmon_in:
ret = xe_hwmon_in_is_visible(hwmon, attr);
break;
case hwmon_energy:
ret = xe_hwmon_energy_is_visible(hwmon, attr);
break;
default:
ret = 0;
break;
@ -419,6 +509,9 @@ xe_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
case hwmon_in:
ret = xe_hwmon_in_read(hwmon, attr, val);
break;
case hwmon_energy:
ret = xe_hwmon_energy_read(hwmon, attr, val);
break;
default:
ret = -EOPNOTSUPP;
break;
@ -470,6 +563,7 @@ static void
xe_hwmon_get_preregistration_info(struct xe_device *xe)
{
struct xe_hwmon *hwmon = xe->hwmon;
long energy;
u32 val_sku_unit = 0;
int ret;
@ -478,8 +572,17 @@ xe_hwmon_get_preregistration_info(struct xe_device *xe)
* The contents of register PKG_POWER_SKU_UNIT do not change,
* so read it once and store the shift values.
*/
if (!ret)
if (!ret) {
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 xe_hwmon_energy_info', i.e. set fields to the
* first value of the energy register read
*/
if (xe_hwmon_is_visible(hwmon, hwmon_energy, hwmon_energy_input, 0))
xe_hwmon_energy_get(hwmon, &energy);
}
void xe_hwmon_register(struct xe_device *xe)