| Message ID | 20220916150054.807590-3-badal.nilawar@intel.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | drm/i915: Add HWMON support | expand |
On 9/16/2022 8:30 PM, Badal Nilawar wrote: > From: Riana Tauro <riana.tauro@intel.com> > > Use i915 HWMON subsystem to display current input voltage. > > v2: > - Updated date and kernel version in feature description > - Fixed review comments (Ashutosh) > v3: Use macro HWMON_CHANNEL_INFO to define hwmon channel (Guenter) > v4: > - Fixed review comments (Ashutosh) > - Use hwm_ prefix for static functions (Ashutosh) > v5: > - Added unit of voltage as millivolts (Ashutosh) > - Updated date, kernel version in documentation > > Cc: Guenter Roeck <linux@roeck-us.net> > Cc: Anshuman Gupta <anshuman.gupta@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> Looks good to me. Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com> > --- > .../ABI/testing/sysfs-driver-intel-i915-hwmon | 7 +++ > drivers/gpu/drm/i915/gt/intel_gt_regs.h | 3 ++ > drivers/gpu/drm/i915/i915_hwmon.c | 53 +++++++++++++++++++ > 3 files changed, 63 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > > diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > new file mode 100644 > index 000000000000..e2974f928e58 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon > @@ -0,0 +1,7 @@ > +What: /sys/devices/.../hwmon/hwmon<i>/in0_input > +Date: September 2022 > +KernelVersion: 6 > +Contact: dri-devel@lists.freedesktop.org > +Description: RO. Current Voltage in millivolt. > + > + Only supported for particular Intel i915 graphics platforms. > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > index 2275ee47da95..65336514554d 100644 > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > @@ -1510,6 +1510,9 @@ > #define VLV_RENDER_C0_COUNT _MMIO(0x138118) > #define VLV_MEDIA_C0_COUNT _MMIO(0x13811c) > > +#define GEN12_RPSTAT1 _MMIO(0x1381b4) > +#define GEN12_VOLTAGE_MASK REG_GENMASK(10, 0) > + > #define GEN11_GT_INTR_DW(x) _MMIO(0x190018 + ((x) * 4)) > #define GEN11_CSME (31) > #define GEN11_GUNIT (28) > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c > index 103dd543a214..45745afa5c5b 100644 > --- a/drivers/gpu/drm/i915/i915_hwmon.c > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > @@ -11,8 +11,16 @@ > #include "i915_hwmon.h" > #include "i915_reg.h" > #include "intel_mchbar_regs.h" > +#include "gt/intel_gt_regs.h" > + > +/* > + * SF_* - scale factors for particular quantities according to hwmon spec. > + * - voltage - millivolts > + */ > +#define SF_VOLTAGE 1000 > > struct hwm_reg { > + i915_reg_t gt_perf_status; > }; > > struct hwm_drvdata { > @@ -29,14 +37,49 @@ struct i915_hwmon { > }; > > static const struct hwmon_channel_info *hwm_info[] = { > + HWMON_CHANNEL_INFO(in, HWMON_I_INPUT), > NULL > }; > > +static umode_t > +hwm_in_is_visible(const struct hwm_drvdata *ddat, u32 attr) > +{ > + switch (attr) { > + case hwmon_in_input: > + return i915_mmio_reg_valid(ddat->hwmon->rg.gt_perf_status) ? 0444 : 0; > + default: > + return 0; > + } > +} > + > +static int > +hwm_in_read(struct hwm_drvdata *ddat, u32 attr, long *val) > +{ > + struct i915_hwmon *hwmon = ddat->hwmon; > + intel_wakeref_t wakeref; > + u32 reg_value; > + > + switch (attr) { > + case hwmon_in_input: > + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) > + reg_value = intel_uncore_read(ddat->uncore, hwmon->rg.gt_perf_status); > + /* HW register value in units of 2.5 millivolt */ > + *val = DIV_ROUND_CLOSEST(REG_FIELD_GET(GEN12_VOLTAGE_MASK, reg_value) * 25, 10); > + return 0; > + default: > + return -EOPNOTSUPP; > + } > +} > + > 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; > + > switch (type) { > + case hwmon_in: > + return hwm_in_is_visible(ddat, attr); > default: > return 0; > } > @@ -46,7 +89,11 @@ 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); > + > switch (type) { > + case hwmon_in: > + return hwm_in_read(ddat, attr, val); > default: > return -EOPNOTSUPP; > } > @@ -76,6 +123,12 @@ static const struct hwmon_chip_info hwm_chip_info = { > static void > hwm_get_preregistration_info(struct drm_i915_private *i915) > { > + struct i915_hwmon *hwmon = i915->hwmon; > + > + if (IS_DG1(i915) || IS_DG2(i915)) > + hwmon->rg.gt_perf_status = GEN12_RPSTAT1; > + else > + hwmon->rg.gt_perf_status = INVALID_MMIO_REG; > } > > void i915_hwmon_register(struct drm_i915_private *i915)
diff --git a/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon new file mode 100644 index 000000000000..e2974f928e58 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel-i915-hwmon @@ -0,0 +1,7 @@ +What: /sys/devices/.../hwmon/hwmon<i>/in0_input +Date: September 2022 +KernelVersion: 6 +Contact: dri-devel@lists.freedesktop.org +Description: RO. Current Voltage in millivolt. + + Only supported for particular Intel i915 graphics platforms. diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h index 2275ee47da95..65336514554d 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h @@ -1510,6 +1510,9 @@ #define VLV_RENDER_C0_COUNT _MMIO(0x138118) #define VLV_MEDIA_C0_COUNT _MMIO(0x13811c) +#define GEN12_RPSTAT1 _MMIO(0x1381b4) +#define GEN12_VOLTAGE_MASK REG_GENMASK(10, 0) + #define GEN11_GT_INTR_DW(x) _MMIO(0x190018 + ((x) * 4)) #define GEN11_CSME (31) #define GEN11_GUNIT (28) diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c index 103dd543a214..45745afa5c5b 100644 --- a/drivers/gpu/drm/i915/i915_hwmon.c +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -11,8 +11,16 @@ #include "i915_hwmon.h" #include "i915_reg.h" #include "intel_mchbar_regs.h" +#include "gt/intel_gt_regs.h" + +/* + * SF_* - scale factors for particular quantities according to hwmon spec. + * - voltage - millivolts + */ +#define SF_VOLTAGE 1000 struct hwm_reg { + i915_reg_t gt_perf_status; }; struct hwm_drvdata { @@ -29,14 +37,49 @@ struct i915_hwmon { }; static const struct hwmon_channel_info *hwm_info[] = { + HWMON_CHANNEL_INFO(in, HWMON_I_INPUT), NULL }; +static umode_t +hwm_in_is_visible(const struct hwm_drvdata *ddat, u32 attr) +{ + switch (attr) { + case hwmon_in_input: + return i915_mmio_reg_valid(ddat->hwmon->rg.gt_perf_status) ? 0444 : 0; + default: + return 0; + } +} + +static int +hwm_in_read(struct hwm_drvdata *ddat, u32 attr, long *val) +{ + struct i915_hwmon *hwmon = ddat->hwmon; + intel_wakeref_t wakeref; + u32 reg_value; + + switch (attr) { + case hwmon_in_input: + with_intel_runtime_pm(ddat->uncore->rpm, wakeref) + reg_value = intel_uncore_read(ddat->uncore, hwmon->rg.gt_perf_status); + /* HW register value in units of 2.5 millivolt */ + *val = DIV_ROUND_CLOSEST(REG_FIELD_GET(GEN12_VOLTAGE_MASK, reg_value) * 25, 10); + return 0; + default: + return -EOPNOTSUPP; + } +} + 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; + switch (type) { + case hwmon_in: + return hwm_in_is_visible(ddat, attr); default: return 0; } @@ -46,7 +89,11 @@ 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); + switch (type) { + case hwmon_in: + return hwm_in_read(ddat, attr, val); default: return -EOPNOTSUPP; } @@ -76,6 +123,12 @@ static const struct hwmon_chip_info hwm_chip_info = { static void hwm_get_preregistration_info(struct drm_i915_private *i915) { + struct i915_hwmon *hwmon = i915->hwmon; + + if (IS_DG1(i915) || IS_DG2(i915)) + hwmon->rg.gt_perf_status = GEN12_RPSTAT1; + else + hwmon->rg.gt_perf_status = INVALID_MMIO_REG; } void i915_hwmon_register(struct drm_i915_private *i915)