On Thu, Sep 05, 2024 at 11:56:15AM +0530, Nilawar, Badal wrote: > > > On 28-08-2024 10:15, Raag Jadav wrote: > > Add hwmon support for temp1_input attribute, which will expose package > > temperature in millidegree Celsius. With this in place we can monitor > > package temperature using lm-sensors tool. > > > > $ sensors > > i915-pci-0300 > > Adapter: PCI adapter > > in0: 990.00 mV > > fan1: 1260 RPM > > temp1: +45.0°C > > power1: N/A (max = 35.00 W) > > energy1: 12.62 kJ > > > > Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11276 > > Signed-off-by: Raag Jadav <raag.jadav@xxxxxxxxx> > > --- > > .../ABI/testing/sysfs-driver-intel-i915-hwmon | 8 ++++ > > drivers/gpu/drm/i915/i915_hwmon.c | 39 +++++++++++++++++++ > > drivers/gpu/drm/i915/intel_mchbar_regs.h | 4 ++ > > 3 files changed, 51 insertions(+) > > > > diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > > index be4141a7522f..a885e5316d02 100644 > > --- a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > > +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > > @@ -83,3 +83,11 @@ Contact: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > Description: RO. Fan speed of device in RPM. > > Only supported for particular Intel i915 graphics platforms. > > + > > +What: /sys/bus/pci/drivers/i915/.../hwmon/hwmon<i>/temp1_input > > +Date: November 2024 > > +KernelVersion: 6.12 > > +Contact: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > +Description: RO. GPU package temperature in millidegree Celsius. > > + > > + 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 17d30f6b84b0..9f1a2300510b 100644 > > --- a/drivers/gpu/drm/i915/i915_hwmon.c > > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > > @@ -7,6 +7,7 @@ > > #include <linux/hwmon-sysfs.h> > > #include <linux/jiffies.h> > > #include <linux/types.h> > > +#include <linux/units.h> > > #include "i915_drv.h" > > #include "i915_hwmon.h" > > @@ -32,6 +33,7 @@ > > struct hwm_reg { > > i915_reg_t gt_perf_status; > > + i915_reg_t pkg_temp; > > i915_reg_t pkg_power_sku_unit; > > i915_reg_t pkg_power_sku; > > i915_reg_t pkg_rapl_limit; > > @@ -280,6 +282,7 @@ static const struct attribute_group *hwm_groups[] = { > > }; > > static const struct hwmon_channel_info * const hwm_info[] = { > > + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), > > HWMON_CHANNEL_INFO(in, HWMON_I_INPUT), > > HWMON_CHANNEL_INFO(power, HWMON_P_MAX | HWMON_P_RATED_MAX | HWMON_P_CRIT), > > HWMON_CHANNEL_INFO(energy, HWMON_E_INPUT), > > @@ -310,6 +313,36 @@ static int hwm_pcode_write_i1(struct drm_i915_private *i915, u32 uval) > > POWER_SETUP_SUBCOMMAND_WRITE_I1, 0, uval); > > } > > +static umode_t > > +hwm_temp_is_visible(const struct hwm_drvdata *ddat, u32 attr) > > +{ > > + struct i915_hwmon *hwmon = ddat->hwmon; > > + > > + if (attr == hwmon_temp_input && i915_mmio_reg_valid(hwmon->rg.pkg_temp)) > > + return 0444; > > + > > + return 0; > > +} > > + > > +static int > > +hwm_temp_read(struct hwm_drvdata *ddat, u32 attr, long *val) > > +{ > > + struct i915_hwmon *hwmon = ddat->hwmon; > > + intel_wakeref_t wakeref; > > + u32 reg_val; > > + > > + if (attr == hwmon_temp_input) { > > + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) > > + reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.pkg_temp); > > + > > + /* HW register value is in degrees, convert to millidegrees. */ > > + *val = REG_FIELD_GET(TEMP_MASK, reg_val) * MILLIDEGREE_PER_DEGREE; > > + return 0; > > + } > > + > > + return -EOPNOTSUPP; > > +} > Let's try to have synergy between previous attribute, such as hwm_fan_input, > and this one. This one's simple enough to be inline IMHO. Besides, it's already in synergy with hwm_in_read() which has similar implementation. Raag
