[Intel-xe] [PATCH v2 2/6] drm/xe/hwmon: Expose power attributes
Matthew Brost
matthew.brost at intel.com
Thu Jun 29 00:18:02 UTC 2023
On Wed, Jun 28, 2023 at 12:00:39AM +0530, Badal Nilawar wrote:
> Expose power_max (pl1) and power_rated_max (tdp) attributes.
> This is port from i915 hwmon.
>
Not expert in this domain but this statement makes be nervous as
generally shouldn't just blindly port things from the i915. Doing an
initial review but will need a domain expert too.
> v2:
> - Move rpm calls (xe_device_mem_access_get/put) to hwmon functions from
> process_hwmon_reg to avoid multiple rpm entry exits during consecutive
> reg accesses
> - Fix review comments (Riana)
>
> Signed-off-by: Badal Nilawar <badal.nilawar at intel.com>
> ---
> .../ABI/testing/sysfs-driver-intel-xe-hwmon | 22 ++
> drivers/gpu/drm/xe/regs/xe_gt_regs.h | 4 +
> drivers/gpu/drm/xe/regs/xe_mchbar_regs.h | 34 ++
> drivers/gpu/drm/xe/xe_hwmon.c | 372 +++++++++++++++++-
> drivers/gpu/drm/xe/xe_hwmon.h | 4 +
> drivers/gpu/drm/xe/xe_uc.c | 6 +
> 6 files changed, 435 insertions(+), 7 deletions(-)
> create mode 100644 Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
> create mode 100644 drivers/gpu/drm/xe/regs/xe_mchbar_regs.h
>
> diff --git a/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
> new file mode 100644
> index 000000000000..ff3465195870
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon
> @@ -0,0 +1,22 @@
> +What: /sys/devices/.../hwmon/hwmon<i>/power1_max
> +Date: July 2023
Future?
> +KernelVersion: 6.3
> +Contact: intel-gfx at lists.freedesktop.org
s/intel-gfx/intel-xe
> +Description: RW. Card reactive sustained (PL1/Tau) power limit in microwatts.
> +
> + The power controller will throttle the operating frequency
> + if the power averaged over a window (typically seconds)
> + exceeds this limit. A read value of 0 means that the PL1
> + power limit is disabled, writing 0 disables the
> + limit. Writing values > 0 will enable the power limit.
> +
> + Only supported for particular Intel xe graphics platforms.
> +
> +What: /sys/devices/.../hwmon/hwmon<i>/power1_rated_max
> +Date: July 2023
> +KernelVersion: 6.3
> +Contact: intel-gfx at lists.freedesktop.org
> +Description: RO. Card default power limit (default TDP setting).
> +
> + Only supported for particular Intel xe graphics platforms.
> +
> diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> index d654f3311351..eb7210afbd2c 100644
> --- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> +++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
> @@ -397,4 +397,8 @@
> #define XEHPC_BCS5_BCS6_INTR_MASK XE_REG(0x190118)
> #define XEHPC_BCS7_BCS8_INTR_MASK XE_REG(0x19011c)
>
> +#define PVC_GT0_PACKAGE_RAPL_LIMIT XE_REG(0x281008)
> +#define PVC_GT0_PACKAGE_POWER_SKU_UNIT XE_REG(0x281068)
> +#define PVC_GT0_PACKAGE_POWER_SKU XE_REG(0x281080)
> +
> #endif
> diff --git a/drivers/gpu/drm/xe/regs/xe_mchbar_regs.h b/drivers/gpu/drm/xe/regs/xe_mchbar_regs.h
> new file mode 100644
> index 000000000000..cb2d49b5c8a9
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/regs/xe_mchbar_regs.h
> @@ -0,0 +1,34 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#ifndef _XE_MCHBAR_REGS_H__
> +#define _XE_MCHBAR_REGS_H_
> +
> +#include "regs/xe_reg_defs.h"
> +
> +/*
> + * MCHBAR mirror.
> + *
> + * This mirrors the MCHBAR MMIO space whose location is determined by
> + * device 0 function 0's pci config register 0x44 or 0x48 and matches it in
> + * every way.
> + */
> +
> +#define MCHBAR_MIRROR_BASE_SNB 0x140000
> +
> +#define PCU_CR_PACKAGE_POWER_SKU XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x5930)
> +#define PKG_PKG_TDP GENMASK_ULL(14, 0)
> +#define PKG_MIN_PWR GENMASK_ULL(30, 16)
> +#define PKG_MAX_PWR GENMASK_ULL(46, 32)
> +
> +#define PCU_CR_PACKAGE_POWER_SKU_UNIT XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x5938)
> +#define PKG_PWR_UNIT REG_GENMASK(3, 0)
> +
> +#define PCU_CR_PACKAGE_RAPL_LIMIT XE_REG(MCHBAR_MIRROR_BASE_SNB + 0x59a0)
> +#define PKG_PWR_LIM_1 REG_GENMASK(14, 0)
> +#define PKG_PWR_LIM_1_EN REG_BIT(15)
> +
> +#endif
> +
> diff --git a/drivers/gpu/drm/xe/xe_hwmon.c b/drivers/gpu/drm/xe/xe_hwmon.c
> index 8f653fdf4ad5..a4fba29d5d5a 100644
> --- a/drivers/gpu/drm/xe/xe_hwmon.c
> +++ b/drivers/gpu/drm/xe/xe_hwmon.c
> @@ -5,53 +5,394 @@
>
> #include <linux/hwmon.h>
>
> +#include "regs/xe_mchbar_regs.h"
> #include "regs/xe_gt_regs.h"
> #include "xe_device.h"
> #include "xe_hwmon.h"
> +#include "xe_mmio.h"
> +#include "xe_gt.h"
Nit - includes should be in alphabetical order.
> +
> +enum hwm_reg_name {
> + pkg_rapl_limit,
> + pkg_power_sku,
> + pkg_power_sku_unit,
Upper case? I guess hwmon_power_max is lower case so is that the
convention?
> +};
> +
> +enum hwm_reg_operation {
> + reg_read,
> + reg_write,
> + reg_rmw,
Upper case?
> +};
> +
s/hwm_reg/xe_hwm_reg
> +/*
> + * SF_* - scale factors for particular quantities according to hwmon spec.
> + * - power - microwatts
> + */
> +#define SF_POWER 1000000
>
> struct hwm_drvdata {
> struct xe_hwmon *hwmon;
> struct device *hwmon_dev;
> + struct xe_gt *gt;
> char name[12];
> + bool reset_in_progress;
> + wait_queue_head_t waitq;
> };
>
> struct xe_hwmon {
> struct hwm_drvdata ddat;
> struct mutex hwmon_lock;
> + int scl_shift_power;
> };
>
Same as previous patch, 1 struct seems like a better idea to me.
> +struct xe_reg hwm_get_reg(struct hwm_drvdata *ddat, enum hwm_reg_name reg_name)
s/hwm_get_reg/xe_hwmon_get_reg
> +{
> + struct xe_device *xe = gt_to_xe(ddat->gt);
> +
> + switch (reg_name) {
> + case pkg_rapl_limit:
> + if (xe->info.platform == XE_DG2)
> + return PCU_CR_PACKAGE_RAPL_LIMIT;
> + else if (xe->info.platform == XE_PVC)
> + return PVC_GT0_PACKAGE_RAPL_LIMIT;
> + break;
> + case pkg_power_sku:
> + if (xe->info.platform == XE_DG2)
> + return PCU_CR_PACKAGE_POWER_SKU;
> + else if (xe->info.platform == XE_PVC)
> + return PVC_GT0_PACKAGE_POWER_SKU;
> + break;
> + case pkg_power_sku_unit:
> + if (xe->info.platform == XE_DG2)
> + return PCU_CR_PACKAGE_POWER_SKU_UNIT;
> + else if (xe->info.platform == XE_PVC)
> + return PVC_GT0_PACKAGE_POWER_SKU_UNIT;
> + break;
> + default:
BUG_ON or WARN_ON saying not possible?
> + break;
> + }
> +
> + return XE_REG(0);
> +}
> +
> +int process_hwmon_reg(struct hwm_drvdata *ddat, enum hwm_reg_name reg_name,
> + enum hwm_reg_operation operation, u32 *value,
> + u32 clr, u32 set)
> +{
> + struct xe_reg reg;
> + int ret = 0;
> +
> + reg = hwm_get_reg(ddat, reg_name);
> +
> + if (!reg.raw)
> + return -EOPNOTSUPP;
> +
> + switch (operation) {
> + case reg_read:
> + *value = xe_mmio_read32(ddat->gt, reg);
> + break;
> + case reg_write:
> + xe_mmio_write32(ddat->gt, reg, *value);
> + break;
> + case reg_rmw:
> + *value = xe_mmio_rmw32(ddat->gt, reg, clr, set);
> + break;
> + default:
BUG_ON or WARN_ON saying not possible?
> + ret = -EOPNOTSUPP;
> + }
> +
> + return ret;
> +}
> +
> +int process_hwmon_reg_read64(struct hwm_drvdata *ddat, enum hwm_reg_name reg_name, u64 *value)
> +{
> + struct xe_reg reg;
> +
> + reg = hwm_get_reg(ddat, reg_name);
> +
> + if (!reg.raw)
> + return -EOPNOTSUPP;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
Don't need this, the upper levels of the stack should have this. You
could just do a xe_device_assert_mem_access here.
> +
> + *value = xe_mmio_read64(ddat->gt, reg);
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +
> + return 0;
> +}
> +
> +#define PL1_DISABLE 0
> +
> +/*
> + * HW allows arbitrary PL1 limits to be set but silently clamps these values to
> + * "typical but not guaranteed" min/max values in rg.pkg_power_sku. Follow the
> + * same pattern for sysfs, allow arbitrary PL1 limits to be set but display
> + * clamped values when read.
> + */
> +static int hwm_power_max_read(struct hwm_drvdata *ddat, long *value)
The return value is always 0, why not return value?
s/hwm_power_max_read/xe_hwmon_power_max_read
> +{
> + struct xe_hwmon *hwmon = ddat->hwmon;
> + u32 reg_val;
> + u64 r, min, max;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
> +
Same as above, use xe_device_assert_mem_access.
> + process_hwmon_reg(ddat, pkg_rapl_limit, reg_read, ®_val, 0, 0);
> + /* Check if PL1 limit is disabled */
> + if (!(reg_val & PKG_PWR_LIM_1_EN)) {
> + *value = PL1_DISABLE;
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> + return 0;
> + }
> +
> + reg_val = REG_FIELD_GET(PKG_PWR_LIM_1, reg_val);
> + *value = mul_u64_u32_shr(reg_val, SF_POWER, hwmon->scl_shift_power);
> +
> + process_hwmon_reg_read64(ddat, pkg_power_sku, &r);
> + min = REG_FIELD_GET(PKG_MIN_PWR, r);
> + min = mul_u64_u32_shr(min, SF_POWER, hwmon->scl_shift_power);
> + max = REG_FIELD_GET(PKG_MAX_PWR, r);
> + max = mul_u64_u32_shr(max, SF_POWER, hwmon->scl_shift_power);
> +
> + if (min && max)
> + *value = clamp_t(u64, *value, min, max);
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> + return 0;
> +}
> +
> +static int hwm_power_max_write(struct hwm_drvdata *ddat, long value)
> +{
> + struct xe_hwmon *hwmon = ddat->hwmon;
> + DEFINE_WAIT(wait);
> + int ret = 0;
> + u32 nval;
> +
> + /* Block waiting for GuC reset to complete when needed */
> + for (;;) {
> + mutex_lock(&hwmon->hwmon_lock);
> +
> + prepare_to_wait(&ddat->waitq, &wait, TASK_INTERRUPTIBLE);
> +
> + if (!hwmon->ddat.reset_in_progress)
> + break;
> +
> + if (signal_pending(current)) {
> + ret = -EINTR;
> + break;
> + }
> +
> + mutex_unlock(&hwmon->hwmon_lock);
> +
> + schedule();
> + }
> + finish_wait(&ddat->waitq, &wait);
> + if (ret)
> + goto unlock;
Anyway to not open code this? We similar in with
xe_guc_submit_reset_wait, could we expose a global reset in progress in
function which we can expose at the gt level?
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
> +
This certainly is an outer most thing, e.g. doing this under
hwmon->hwmon_lock seems dangerous. Again the upper levels of the stack
should do the xe_device_mem_access_get, which it does. Just pointing out
doing xe_device_mem_access_get/put under a lock isn't a good idea.
Also the the loop which acquires hwmon->hwmon_lock is confusing too.
> + /* Disable PL1 limit and verify, as limit cannot be disabled on all platforms */
> + if (value == PL1_DISABLE) {
> + process_hwmon_reg(ddat, pkg_rapl_limit, reg_rmw, &nval,
> + PKG_PWR_LIM_1_EN, 0);
> + process_hwmon_reg(ddat, pkg_rapl_limit, reg_read, &nval,
> + PKG_PWR_LIM_1_EN, 0);
> +
> + if (nval & PKG_PWR_LIM_1_EN)
> + ret = -ENODEV;
> + goto exit;
> + }
> +
> + /* Computation in 64-bits to avoid overflow. Round to nearest. */
> + nval = DIV_ROUND_CLOSEST_ULL((u64)value << hwmon->scl_shift_power, SF_POWER);
> + nval = PKG_PWR_LIM_1_EN | REG_FIELD_PREP(PKG_PWR_LIM_1, nval);
> +
> + process_hwmon_reg(ddat, pkg_rapl_limit, reg_rmw, &nval,
> + PKG_PWR_LIM_1_EN | PKG_PWR_LIM_1, nval);
> +exit:
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +unlock:
> + mutex_unlock(&hwmon->hwmon_lock);
> +
Again a clear lock / unlock is desirable.
> + return 0;
> +}
> +
> +static int hwm_power_rated_max_read(struct hwm_drvdata *ddat, long *value)
> +{
s/hwm_power_rated_max_read/xe_hwmon_power_rated_max_read
> + struct xe_hwmon *hwmon = ddat->hwmon;
> + u32 reg_val;
> +
> + process_hwmon_reg(ddat, pkg_power_sku, reg_read, ®_val, 0, 0);
> + reg_val = REG_FIELD_GET(PKG_PKG_TDP, reg_val);
> + *value = mul_u64_u32_shr(reg_val, SF_POWER, hwmon->scl_shift_power);
> +
> + return 0;
> +}
> +
> static const struct hwmon_channel_info *hwm_info[] = {
s/hwm_info/xe_hwmon_info
> + HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX),
> NULL
> };
>
> +static umode_t
> +hwm_power_is_visible(struct hwm_drvdata *ddat, u32 attr, int chan)
> +{
s/hwm_power_is_visible/xe_hwmon_power_is_visible
> + u32 reg_val;
> +
> + switch (attr) {
> + case hwmon_power_max:
> + return process_hwmon_reg(ddat, pkg_rapl_limit,
> + reg_read, ®_val, 0, 0) ? 0 : 0664;
> + case hwmon_power_rated_max:
> + return process_hwmon_reg(ddat, pkg_power_sku,
> + reg_read, ®_val, 0, 0) ? 0 : 0444;
> + default:
> + return 0;
> + }
> +}
> +
> +static int
> +hwm_power_read(struct hwm_drvdata *ddat, u32 attr, int chan, long *val)
> +{
s/hwm_power_read/xe_hwmon_power_read
> + switch (attr) {
> + case hwmon_power_max:
> + return hwm_power_max_read(ddat, val);
> + case hwmon_power_rated_max:
> + return hwm_power_rated_max_read(ddat, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int
> +hwm_power_write(struct hwm_drvdata *ddat, u32 attr, int chan, long val)
> +{
s/hwm_power_write/xe_hwmon_power_write
> + switch (attr) {
> + case hwmon_power_max:
> + return hwm_power_max_write(ddat, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +void xe_hwmon_power_max_disable(struct xe_device *xe, bool *old)
> +{
> + struct xe_hwmon *hwmon = xe->hwmon;
> + struct hwm_drvdata *ddat = &hwmon->ddat;
> + u32 r;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
> +
Upper level should have, use an assert if anything.
> + if (!hwmon || process_hwmon_reg(ddat, pkg_rapl_limit,
> + reg_read, &r, 0, 0))
> + return;
> +
> + mutex_lock(&hwmon->hwmon_lock);
> +
> + hwmon->ddat.reset_in_progress = true;
> +
> + process_hwmon_reg(ddat, pkg_rapl_limit, reg_rmw, &r,
> + PKG_PWR_LIM_1_EN, 0);
> + *old = !!(r & PKG_PWR_LIM_1_EN);
> +
> + mutex_unlock(&hwmon->hwmon_lock);
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +}
> +
> +void xe_hwmon_power_max_restore(struct xe_device *xe, bool old)
> +{
> + struct xe_hwmon *hwmon = xe->hwmon;
> + struct hwm_drvdata *ddat = &hwmon->ddat;
> + u32 r;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
Upper level should have, use an assert if anything.
> +
> + if (!hwmon || process_hwmon_reg(ddat, pkg_rapl_limit,
> + reg_read, &r, 0, 0))
> + return;
> +
> + mutex_lock(&hwmon->hwmon_lock);
> +
> + process_hwmon_reg(ddat, pkg_rapl_limit, reg_rmw, &r,
> + PKG_PWR_LIM_1_EN, old ? PKG_PWR_LIM_1_EN : 0);
> +
> + hwmon->ddat.reset_in_progress = false;
> + wake_up_all(&hwmon->ddat.waitq);
> +
> + mutex_unlock(&hwmon->hwmon_lock);
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +}
> +
> static umode_t
> hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type,
> u32 attr, int channel)
> {
> + struct hwm_drvdata *ddat = (struct hwm_drvdata *)drvdata;
> + int ret;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
> +
Nit, include the get / put in previous patch.
> switch (type) {
> + case hwmon_power:
> + ret = hwm_power_is_visible(ddat, attr, channel);
> + break;
> default:
> - return 0;
> + ret = 0;
> }
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +
> + return ret;
> }
>
> static int
> hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
> int channel, long *val)
> {
> + struct hwm_drvdata *ddat = dev_get_drvdata(dev);
> + int ret;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
Nit, include the get / put in previous patch.
> +
> switch (type) {
> + case hwmon_power:
> + ret = hwm_power_read(ddat, attr, channel, val);
> + break;
> default:
> - return -EOPNOTSUPP;
> + ret = -EOPNOTSUPP;
> + break;
> }
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +
> + return ret;
> }
>
> static int
> hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
> int channel, long val)
> {
> + struct hwm_drvdata *ddat = dev_get_drvdata(dev);
> + int ret;
> +
> + xe_device_mem_access_get(gt_to_xe(ddat->gt));
Nit, include the get / put in previous patch.
> +
> switch (type) {
> + case hwmon_power:
> + ret = hwm_power_write(ddat, attr, channel, val);
> + break;
> default:
> - return -EOPNOTSUPP;
> + ret = -EOPNOTSUPP;
> + break;
> }
> +
> + xe_device_mem_access_put(gt_to_xe(ddat->gt));
> +
> + return ret;
> }
>
> static const struct hwmon_ops hwm_ops = {
> @@ -66,8 +407,19 @@ static const struct hwmon_chip_info hwm_chip_info = {
> };
>
> static void
> -hwm_get_preregistration_info(struct xe_device *xe)
> +hwm_get_preregistration_info(struct hwm_drvdata *ddat)
Why change the function argument?
> {
> + struct xe_hwmon *hwmon = ddat->hwmon;
> + u32 val_sku_unit = 0;
> + int ret;
> +
> + ret = process_hwmon_reg(ddat, pkg_power_sku_unit, reg_read, &val_sku_unit, 0, 0);
> + /*
> + * The contents of register pkg_power_sku_unit do not change,
> + * so read it once and store the shift values.
> + */
> + if (!ret)
> + hwmon->scl_shift_power = REG_FIELD_GET(PKG_PWR_UNIT, val_sku_unit);
> }
>
> void xe_hwmon_register(struct xe_device *xe)
> @@ -89,18 +441,24 @@ void xe_hwmon_register(struct xe_device *xe)
> mutex_init(&hwmon->hwmon_lock);
> ddat = &hwmon->ddat;
>
> + /* primary GT to access device level properties */
> + ddat->gt = xe->tiles[0].primary_gt;
> +
> ddat->hwmon = hwmon;
> snprintf(ddat->name, sizeof(ddat->name), "xe");
>
> - hwm_get_preregistration_info(xe);
> + init_waitqueue_head(&ddat->waitq);
>
> - drm_dbg(&xe->drm, "Register HWMON interface\n");
> + hwm_get_preregistration_info(ddat);
>
> - /* hwmon_dev points to device hwmon<i> */
> + drm_dbg(&xe->drm, "Register xe hwmon interface\n");
> +
> + /* hwmon_dev points to device hwmon<i> */
> hwmon_dev = devm_hwmon_device_register_with_info(dev, ddat->name,
> ddat,
> &hwm_chip_info,
> NULL);
> +
Unrelated, probably delete,
> if (IS_ERR(hwmon_dev)) {
> drm_warn(&xe->drm, "Fail to register xe hwmon\n");
Missed this the prior patch but include the error value in the print.
> xe->hwmon = NULL;
> diff --git a/drivers/gpu/drm/xe/xe_hwmon.h b/drivers/gpu/drm/xe/xe_hwmon.h
> index a078eeb0a68b..a5dc693569c5 100644
> --- a/drivers/gpu/drm/xe/xe_hwmon.h
> +++ b/drivers/gpu/drm/xe/xe_hwmon.h
> @@ -14,9 +14,13 @@ struct xe_device;
> #if IS_REACHABLE(CONFIG_HWMON)
> void xe_hwmon_register(struct xe_device *xe);
> void xe_hwmon_unregister(struct xe_device *xe);
> +void xe_hwmon_power_max_disable(struct xe_device *xe, bool *old);
> +void xe_hwmon_power_max_restore(struct xe_device *xe, bool old);
> #else
> static inline void xe_hwmon_register(struct xe_device *xe) { };
> static inline void xe_hwmon_unregister(struct xe_device *xe) { };
> +static inline void xe_hwmon_power_max_disable(struct xe_device *xe, bool *old) { };
> +static inline void xe_hwmon_power_max_restore(struct xe_device *xe, bool old) { };
> #endif
>
> #endif /* __XE_HWMON_H__ */
> diff --git a/drivers/gpu/drm/xe/xe_uc.c b/drivers/gpu/drm/xe/xe_uc.c
> index 70eabf567156..9df5a3a85dc3 100644
> --- a/drivers/gpu/drm/xe/xe_uc.c
> +++ b/drivers/gpu/drm/xe/xe_uc.c
> @@ -13,6 +13,7 @@
> #include "xe_huc.h"
> #include "xe_uc_fw.h"
> #include "xe_wopcm.h"
> +#include "xe_hwmon.h"
>
> static struct xe_gt *
> uc_to_gt(struct xe_uc *uc)
> @@ -127,11 +128,15 @@ int xe_uc_init_hwconfig(struct xe_uc *uc)
> int xe_uc_init_hw(struct xe_uc *uc)
> {
> int ret;
> + bool pl1en;
>
> /* GuC submission not enabled, nothing to do */
> if (!xe_device_guc_submission_enabled(uc_to_xe(uc)))
> return 0;
>
> + /* Disable a potentially low PL1 power limit to allow freq to be raised */
> + xe_hwmon_power_max_disable(uc_to_xe(uc), &pl1en);
Don't love the pass by reference, how about 'pl1en =
xe_hwmon_power_max_disable(...'
Matt
> +
> ret = xe_uc_sanitize_reset(uc);
> if (ret)
> return ret;
> @@ -160,6 +165,7 @@ int xe_uc_init_hw(struct xe_uc *uc)
> if (ret)
> return ret;
>
> + xe_hwmon_power_max_restore(uc_to_xe(uc), pl1en);
Add line of white space.
Matt
> /* We don't fail the driver load if HuC fails to auth, but let's warn */
> ret = xe_huc_auth(&uc->huc);
> XE_WARN_ON(ret);
> --
> 2.25.1
>
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