| Message ID | 20220916150054.807590-2-badal.nilawar@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915: Add HWMON support | expand |
On 9/16/2022 8:30 PM, Badal Nilawar wrote: > From: Dale B Stimson <dale.b.stimson@intel.com> > > The i915 HWMON module will be used to expose voltage, power and energy > values for dGfx. Here we set up i915 hwmon infrastructure including i915 > hwmon registration, basic data structures and functions. > > v2: > - Create HWMON infra patch (Ashutosh) > - Fixed review comments (Jani) > - Remove "select HWMON" from i915/Kconfig (Jani) > v3: Use hwm_ prefix for static functions (Ashutosh) > v4: s/#ifdef CONFIG_HWMON/#if IS_REACHABLE(CONFIG_HWMON)/ since the former > doesn't work if hwmon is compiled as a module (Guenter) > v5: Fixed review comments (Jani) > > Cc: Guenter Roeck <linux@roeck-us.net> > 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> > --- > drivers/gpu/drm/i915/Makefile | 3 + > drivers/gpu/drm/i915/i915_driver.c | 5 ++ > drivers/gpu/drm/i915/i915_drv.h | 2 + > drivers/gpu/drm/i915/i915_hwmon.c | 136 +++++++++++++++++++++++++++++ > drivers/gpu/drm/i915/i915_hwmon.h | 20 +++++ > 5 files changed, 166 insertions(+) > create mode 100644 drivers/gpu/drm/i915/i915_hwmon.c > create mode 100644 drivers/gpu/drm/i915/i915_hwmon.h > > diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile > index a26edcdadc21..66a6023e61a6 100644 > --- a/drivers/gpu/drm/i915/Makefile > +++ b/drivers/gpu/drm/i915/Makefile > @@ -209,6 +209,9 @@ i915-y += gt/uc/intel_uc.o \ > # graphics system controller (GSC) support > i915-y += gt/intel_gsc.o > > +# graphics hardware monitoring (HWMON) support > +i915-$(CONFIG_HWMON) += i915_hwmon.o > + > # modesetting core code > i915-y += \ > display/hsw_ips.o \ > diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c > index c459eb362c47..75655adb7bd3 100644 > --- a/drivers/gpu/drm/i915/i915_driver.c > +++ b/drivers/gpu/drm/i915/i915_driver.c > @@ -81,6 +81,7 @@ > #include "i915_drm_client.h" > #include "i915_drv.h" > #include "i915_getparam.h" > +#include "i915_hwmon.h" > #include "i915_ioc32.h" > #include "i915_ioctl.h" > #include "i915_irq.h" > @@ -763,6 +764,8 @@ static void i915_driver_register(struct drm_i915_private *dev_priv) > for_each_gt(gt, dev_priv, i) > intel_gt_driver_register(gt); > > + i915_hwmon_register(dev_priv); > + > intel_display_driver_register(dev_priv); > > intel_power_domains_enable(dev_priv); > @@ -795,6 +798,8 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv) > for_each_gt(gt, dev_priv, i) > intel_gt_driver_unregister(gt); > > + i915_hwmon_unregister(dev_priv); > + > i915_perf_unregister(dev_priv); > i915_pmu_unregister(dev_priv); > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 9f9372931fd2..01a2caf42635 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -353,6 +353,8 @@ struct drm_i915_private { > > struct i915_perf perf; > > + struct i915_hwmon *hwmon; > + > /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */ > struct intel_gt gt0; > > diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c > new file mode 100644 > index 000000000000..103dd543a214 > --- /dev/null > +++ b/drivers/gpu/drm/i915/i915_hwmon.c > @@ -0,0 +1,136 @@ > +// SPDX-License-Identifier: MIT > +/* > + * Copyright © 2022 Intel Corporation > + */ > + > +#include <linux/hwmon.h> > +#include <linux/hwmon-sysfs.h> > +#include <linux/types.h> > + > +#include "i915_drv.h" > +#include "i915_hwmon.h" > +#include "i915_reg.h" > +#include "intel_mchbar_regs.h" > + > +struct hwm_reg { > +}; > + > +struct hwm_drvdata { > + struct i915_hwmon *hwmon; > + struct intel_uncore *uncore; > + struct device *hwmon_dev; > + char name[12]; > +}; > + > +struct i915_hwmon { > + struct hwm_drvdata ddat; > + struct mutex hwmon_lock; /* counter overflow logic and rmw */ > + struct hwm_reg rg; > +}; > + > +static const struct hwmon_channel_info *hwm_info[] = { > + NULL > +}; > + > +static umode_t > +hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > + u32 attr, int channel) > +{ > + switch (type) { > + default: > + return 0; > + } > +} > + > +static int > +hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, > + int channel, long *val) > +{ > + switch (type) { > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int > +hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, > + int channel, long val) > +{ > + switch (type) { > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static const struct hwmon_ops hwm_ops = { > + .is_visible = hwm_is_visible, > + .read = hwm_read, > + .write = hwm_write, > +}; > + > +static const struct hwmon_chip_info hwm_chip_info = { > + .ops = &hwm_ops, > + .info = hwm_info, > +}; > + > +static void > +hwm_get_preregistration_info(struct drm_i915_private *i915) > +{ > +} > + > +void i915_hwmon_register(struct drm_i915_private *i915) > +{ > + struct device *dev = i915->drm.dev; > + struct i915_hwmon *hwmon; > + struct device *hwmon_dev; > + struct hwm_drvdata *ddat; > + > + /* hwmon is available only for dGfx */ > + if (!IS_DGFX(i915)) > + return; > + > + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); > + if (!hwmon) > + return; > + > + i915->hwmon = hwmon; > + mutex_init(&hwmon->hwmon_lock); > + ddat = &hwmon->ddat; > + > + ddat->hwmon = hwmon; > + ddat->uncore = &i915->uncore; > + snprintf(ddat->name, sizeof(ddat->name), "i915"); > + > + hwm_get_preregistration_info(i915); > + > + /* hwmon_dev points to device hwmon<i> */ > + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, > + ddat, > + &hwm_chip_info, > + NULL); > + if (IS_ERR(hwmon_dev)) { > + mutex_destroy(&hwmon->hwmon_lock); > + i915->hwmon = NULL; > + kfree(hwmon); > + return; > + } > + > + ddat->hwmon_dev = hwmon_dev; > +} > + > +void i915_hwmon_unregister(struct drm_i915_private *i915) > +{ > + struct i915_hwmon *hwmon; > + struct hwm_drvdata *ddat; > + > + hwmon = fetch_and_zero(&i915->hwmon); > + if (!hwmon) > + return; > + > + ddat = &hwmon->ddat; > + if (ddat->hwmon_dev) > + hwmon_device_unregister(ddat->hwmon_dev); > + > + mutex_destroy(&hwmon->hwmon_lock); > + kfree(hwmon); > +} > diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h > new file mode 100644 > index 000000000000..7ca9cf2c34c9 > --- /dev/null > +++ b/drivers/gpu/drm/i915/i915_hwmon.h > @@ -0,0 +1,20 @@ > +/* SPDX-License-Identifier: MIT */ > + > +/* > + * Copyright © 2022 Intel Corporation > + */ > + > +#ifndef __I915_HWMON_H__ > +#define __I915_HWMON_H__ > + > +struct drm_i915_private; > + > +#if IS_REACHABLE(CONFIG_HWMON) > +void i915_hwmon_register(struct drm_i915_private *i915); > +void i915_hwmon_unregister(struct drm_i915_private *i915); > +#else > +static inline void i915_hwmon_register(struct drm_i915_private *i915) { }; > +static inline void i915_hwmon_unregister(struct drm_i915_private *i915) { }; > +#endif > + > +#endif /* __I915_HWMON_H__ */
Hi Badal, > +struct hwm_reg { > +}; > + > +struct hwm_drvdata { > + struct i915_hwmon *hwmon; > + struct intel_uncore *uncore; > + struct device *hwmon_dev; > + char name[12]; > +}; > + > +struct i915_hwmon { > + struct hwm_drvdata ddat; > + struct mutex hwmon_lock; /* counter overflow logic and rmw */ > + struct hwm_reg rg; > +}; > + > +static const struct hwmon_channel_info *hwm_info[] = { > + NULL > +}; > + > +static umode_t > +hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > + u32 attr, int channel) > +{ > + switch (type) { > + default: > + return 0; > + } > +} > + > +static int > +hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, > + int channel, long *val) > +{ > + switch (type) { > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static int > +hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, > + int channel, long val) > +{ > + switch (type) { > + default: > + return -EOPNOTSUPP; > + } > +} > + > +static const struct hwmon_ops hwm_ops = { > + .is_visible = hwm_is_visible, > + .read = hwm_read, > + .write = hwm_write, > +}; > + > +static const struct hwmon_chip_info hwm_chip_info = { > + .ops = &hwm_ops, > + .info = hwm_info, > +}; what's the point for splitting so much? Can't you just send the hwmon driver all at once? With this patch you are not actually doing anything useful. In my opinion this should be squashed with the next ones. > +static void > +hwm_get_preregistration_info(struct drm_i915_private *i915) > +{ > +} > + > +void i915_hwmon_register(struct drm_i915_private *i915) > +{ > + struct device *dev = i915->drm.dev; > + struct i915_hwmon *hwmon; > + struct device *hwmon_dev; > + struct hwm_drvdata *ddat; > + > + /* hwmon is available only for dGfx */ > + if (!IS_DGFX(i915)) > + return; > + > + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); why don't we use devm_kzalloc? > + if (!hwmon) > + return; > + > + i915->hwmon = hwmon; > + mutex_init(&hwmon->hwmon_lock); > + ddat = &hwmon->ddat; > + > + ddat->hwmon = hwmon; > + ddat->uncore = &i915->uncore; > + snprintf(ddat->name, sizeof(ddat->name), "i915"); > + > + hwm_get_preregistration_info(i915); > + > + /* hwmon_dev points to device hwmon<i> */ > + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, > + ddat, > + &hwm_chip_info, > + NULL); > + if (IS_ERR(hwmon_dev)) { > + mutex_destroy(&hwmon->hwmon_lock); there is not such a big need to destroy the mutex. Destroying mutexes is more useful when you actually are creating/destroying and there is some debug need. I don't think that's the case. With the devm_kzalloc this would be just a return. Andi > + i915->hwmon = NULL; > + kfree(hwmon); > + return; > + } > + > + ddat->hwmon_dev = hwmon_dev; > +} > + > +void i915_hwmon_unregister(struct drm_i915_private *i915) > +{ > + struct i915_hwmon *hwmon; > + struct hwm_drvdata *ddat; > + > + hwmon = fetch_and_zero(&i915->hwmon); > + if (!hwmon) > + return; > + > + ddat = &hwmon->ddat; > + if (ddat->hwmon_dev) > + hwmon_device_unregister(ddat->hwmon_dev); > + > + mutex_destroy(&hwmon->hwmon_lock); > + kfree(hwmon); > +} > diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h > new file mode 100644 > index 000000000000..7ca9cf2c34c9 > --- /dev/null > +++ b/drivers/gpu/drm/i915/i915_hwmon.h > @@ -0,0 +1,20 @@ > +/* SPDX-License-Identifier: MIT */ > + > +/* > + * Copyright © 2022 Intel Corporation > + */ > + > +#ifndef __I915_HWMON_H__ > +#define __I915_HWMON_H__ > + > +struct drm_i915_private; > + > +#if IS_REACHABLE(CONFIG_HWMON) > +void i915_hwmon_register(struct drm_i915_private *i915); > +void i915_hwmon_unregister(struct drm_i915_private *i915); > +#else > +static inline void i915_hwmon_register(struct drm_i915_private *i915) { }; > +static inline void i915_hwmon_unregister(struct drm_i915_private *i915) { }; > +#endif > + > +#endif /* __I915_HWMON_H__ */ > -- > 2.25.1
On 21-09-2022 18:14, Andi Shyti wrote: > Hi Badal, > >> +struct hwm_reg { >> +}; >> + >> +struct hwm_drvdata { >> + struct i915_hwmon *hwmon; >> + struct intel_uncore *uncore; >> + struct device *hwmon_dev; >> + char name[12]; >> +}; >> + >> +struct i915_hwmon { >> + struct hwm_drvdata ddat; >> + struct mutex hwmon_lock; /* counter overflow logic and rmw */ >> + struct hwm_reg rg; >> +}; >> + >> +static const struct hwmon_channel_info *hwm_info[] = { >> + NULL >> +}; >> + >> +static umode_t >> +hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, >> + u32 attr, int channel) >> +{ >> + switch (type) { >> + default: >> + return 0; >> + } >> +} >> + >> +static int >> +hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, >> + int channel, long *val) >> +{ >> + switch (type) { >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static int >> +hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, >> + int channel, long val) >> +{ >> + switch (type) { >> + default: >> + return -EOPNOTSUPP; >> + } >> +} >> + >> +static const struct hwmon_ops hwm_ops = { >> + .is_visible = hwm_is_visible, >> + .read = hwm_read, >> + .write = hwm_write, >> +}; >> + >> +static const struct hwmon_chip_info hwm_chip_info = { >> + .ops = &hwm_ops, >> + .info = hwm_info, >> +}; > > what's the point for splitting so much? Can't you just send the > hwmon driver all at once? With this patch you are not actually > doing anything useful. In my opinion this should be squashed with > the next ones. During discussion in cover letter of rev0 series we decided to create separate infrastructure patch, as we wanted to keep kconfig, i915 hwmon structures and new file addition in separate patch. Further feature wise we kept adding new patches. > >> +static void >> +hwm_get_preregistration_info(struct drm_i915_private *i915) >> +{ >> +} >> + >> +void i915_hwmon_register(struct drm_i915_private *i915) >> +{ >> + struct device *dev = i915->drm.dev; >> + struct i915_hwmon *hwmon; >> + struct device *hwmon_dev; >> + struct hwm_drvdata *ddat; >> + >> + /* hwmon is available only for dGfx */ >> + if (!IS_DGFX(i915)) >> + return; >> + >> + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); > > why don't we use devm_kzalloc? > >> + if (!hwmon) >> + return; >> + >> + i915->hwmon = hwmon; >> + mutex_init(&hwmon->hwmon_lock); >> + ddat = &hwmon->ddat; >> + >> + ddat->hwmon = hwmon; >> + ddat->uncore = &i915->uncore; >> + snprintf(ddat->name, sizeof(ddat->name), "i915"); >> + >> + hwm_get_preregistration_info(i915); >> + >> + /* hwmon_dev points to device hwmon<i> */ >> + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, >> + ddat, >> + &hwm_chip_info, >> + NULL); >> + if (IS_ERR(hwmon_dev)) { >> + mutex_destroy(&hwmon->hwmon_lock); > > there is not such a big need to destroy the mutex. Destroying > mutexes is more useful when you actually are creating/destroying > and there is some debug need. I don't think that's the case. > > With the devm_kzalloc this would be just a return. I think we can switch to devm_kzalloc. Regards, Badal > > Andi > >> + i915->hwmon = NULL; >> + kfree(hwmon); >> + return; >> + } >> + >> + ddat->hwmon_dev = hwmon_dev; >> +} >> + >> +void i915_hwmon_unregister(struct drm_i915_private *i915) >> +{ >> + struct i915_hwmon *hwmon; >> + struct hwm_drvdata *ddat; >> + >> + hwmon = fetch_and_zero(&i915->hwmon); >> + if (!hwmon) >> + return; >> + >> + ddat = &hwmon->ddat; >> + if (ddat->hwmon_dev) >> + hwmon_device_unregister(ddat->hwmon_dev); >> + >> + mutex_destroy(&hwmon->hwmon_lock); >> + kfree(hwmon); >> +} >> diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h >> new file mode 100644 >> index 000000000000..7ca9cf2c34c9 >> --- /dev/null >> +++ b/drivers/gpu/drm/i915/i915_hwmon.h >> @@ -0,0 +1,20 @@ >> +/* SPDX-License-Identifier: MIT */ >> + >> +/* >> + * Copyright © 2022 Intel Corporation >> + */ >> + >> +#ifndef __I915_HWMON_H__ >> +#define __I915_HWMON_H__ >> + >> +struct drm_i915_private; >> + >> +#if IS_REACHABLE(CONFIG_HWMON) >> +void i915_hwmon_register(struct drm_i915_private *i915); >> +void i915_hwmon_unregister(struct drm_i915_private *i915); >> +#else >> +static inline void i915_hwmon_register(struct drm_i915_private *i915) { }; >> +static inline void i915_hwmon_unregister(struct drm_i915_private *i915) { }; >> +#endif >> + >> +#endif /* __I915_HWMON_H__ */ >> -- >> 2.25.1
Hi Badal, > > > +struct hwm_reg { > > > +}; > > > + > > > +struct hwm_drvdata { > > > + struct i915_hwmon *hwmon; > > > + struct intel_uncore *uncore; > > > + struct device *hwmon_dev; > > > + char name[12]; > > > +}; > > > + > > > +struct i915_hwmon { > > > + struct hwm_drvdata ddat; > > > + struct mutex hwmon_lock; /* counter overflow logic and rmw */ > > > + struct hwm_reg rg; > > > +}; > > > + > > > +static const struct hwmon_channel_info *hwm_info[] = { > > > + NULL > > > +}; > > > + > > > +static umode_t > > > +hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, > > > + u32 attr, int channel) > > > +{ > > > + switch (type) { > > > + default: > > > + return 0; > > > + } > > > +} > > > + > > > +static int > > > +hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, > > > + int channel, long *val) > > > +{ > > > + switch (type) { > > > + default: > > > + return -EOPNOTSUPP; > > > + } > > > +} > > > + > > > +static int > > > +hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, > > > + int channel, long val) > > > +{ > > > + switch (type) { > > > + default: > > > + return -EOPNOTSUPP; > > > + } > > > +} > > > + > > > +static const struct hwmon_ops hwm_ops = { > > > + .is_visible = hwm_is_visible, > > > + .read = hwm_read, > > > + .write = hwm_write, > > > +}; > > > + > > > +static const struct hwmon_chip_info hwm_chip_info = { > > > + .ops = &hwm_ops, > > > + .info = hwm_info, > > > +}; > > > > what's the point for splitting so much? Can't you just send the > > hwmon driver all at once? With this patch you are not actually > > doing anything useful. In my opinion this should be squashed with > > the next ones. > During discussion in cover letter of rev0 series we decided to create > separate infrastructure patch, as we wanted to keep kconfig, i915 hwmon > structures and new file addition in separate patch. Further feature wise we > kept adding new patches. I don't really like this patch splitting, but it's my fault I haven't reviewed it already in v1. Please, ignore then. Andi
On Wed, 21 Sep 2022 05:44:35 -0700, Andi Shyti wrote: > > > +void i915_hwmon_register(struct drm_i915_private *i915) > > +{ > > + struct device *dev = i915->drm.dev; > > + struct i915_hwmon *hwmon; > > + struct device *hwmon_dev; > > + struct hwm_drvdata *ddat; > > + > > + /* hwmon is available only for dGfx */ > > + if (!IS_DGFX(i915)) > > + return; > > + > > + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); > > why don't we use devm_kzalloc? > > > + if (!hwmon) > > + return; > > + > > + i915->hwmon = hwmon; > > + mutex_init(&hwmon->hwmon_lock); > > + ddat = &hwmon->ddat; > > + > > + ddat->hwmon = hwmon; > > + ddat->uncore = &i915->uncore; > > + snprintf(ddat->name, sizeof(ddat->name), "i915"); > > + > > + hwm_get_preregistration_info(i915); > > + > > + /* hwmon_dev points to device hwmon<i> */ > > + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, > > + ddat, > > + &hwm_chip_info, > > + NULL); > > + if (IS_ERR(hwmon_dev)) { > > + mutex_destroy(&hwmon->hwmon_lock); > > there is not such a big need to destroy the mutex. Destroying > mutexes is more useful when you actually are creating/destroying > and there is some debug need. I don't think that's the case. > > With the devm_kzalloc this would be just a return. If we are using devm_kzalloc we might as well replace all the hwmon_device_register_with_info's (in Patch 1 and 7) with devm_hwmon_device_register_with_info and then i915_hwmon_unregister is just this: void i915_hwmon_unregister(struct drm_i915_private *i915) { fetch_and_zero(&i915->hwmon); } Even the above statement is probably not needed but might as well retain it for sanity. So this is a simple change. Thanks. -- Ashutosh
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index a26edcdadc21..66a6023e61a6 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -209,6 +209,9 @@ i915-y += gt/uc/intel_uc.o \ # graphics system controller (GSC) support i915-y += gt/intel_gsc.o +# graphics hardware monitoring (HWMON) support +i915-$(CONFIG_HWMON) += i915_hwmon.o + # modesetting core code i915-y += \ display/hsw_ips.o \ diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c index c459eb362c47..75655adb7bd3 100644 --- a/drivers/gpu/drm/i915/i915_driver.c +++ b/drivers/gpu/drm/i915/i915_driver.c @@ -81,6 +81,7 @@ #include "i915_drm_client.h" #include "i915_drv.h" #include "i915_getparam.h" +#include "i915_hwmon.h" #include "i915_ioc32.h" #include "i915_ioctl.h" #include "i915_irq.h" @@ -763,6 +764,8 @@ static void i915_driver_register(struct drm_i915_private *dev_priv) for_each_gt(gt, dev_priv, i) intel_gt_driver_register(gt); + i915_hwmon_register(dev_priv); + intel_display_driver_register(dev_priv); intel_power_domains_enable(dev_priv); @@ -795,6 +798,8 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv) for_each_gt(gt, dev_priv, i) intel_gt_driver_unregister(gt); + i915_hwmon_unregister(dev_priv); + i915_perf_unregister(dev_priv); i915_pmu_unregister(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 9f9372931fd2..01a2caf42635 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -353,6 +353,8 @@ struct drm_i915_private { struct i915_perf perf; + struct i915_hwmon *hwmon; + /* Abstract the submission mechanism (legacy ringbuffer or execlists) away */ struct intel_gt gt0; diff --git a/drivers/gpu/drm/i915/i915_hwmon.c b/drivers/gpu/drm/i915/i915_hwmon.c new file mode 100644 index 000000000000..103dd543a214 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_hwmon.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/types.h> + +#include "i915_drv.h" +#include "i915_hwmon.h" +#include "i915_reg.h" +#include "intel_mchbar_regs.h" + +struct hwm_reg { +}; + +struct hwm_drvdata { + struct i915_hwmon *hwmon; + struct intel_uncore *uncore; + struct device *hwmon_dev; + char name[12]; +}; + +struct i915_hwmon { + struct hwm_drvdata ddat; + struct mutex hwmon_lock; /* counter overflow logic and rmw */ + struct hwm_reg rg; +}; + +static const struct hwmon_channel_info *hwm_info[] = { + NULL +}; + +static umode_t +hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + default: + return 0; + } +} + +static int +hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + switch (type) { + default: + return -EOPNOTSUPP; + } +} + +static int +hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long val) +{ + switch (type) { + default: + return -EOPNOTSUPP; + } +} + +static const struct hwmon_ops hwm_ops = { + .is_visible = hwm_is_visible, + .read = hwm_read, + .write = hwm_write, +}; + +static const struct hwmon_chip_info hwm_chip_info = { + .ops = &hwm_ops, + .info = hwm_info, +}; + +static void +hwm_get_preregistration_info(struct drm_i915_private *i915) +{ +} + +void i915_hwmon_register(struct drm_i915_private *i915) +{ + struct device *dev = i915->drm.dev; + struct i915_hwmon *hwmon; + struct device *hwmon_dev; + struct hwm_drvdata *ddat; + + /* hwmon is available only for dGfx */ + if (!IS_DGFX(i915)) + return; + + hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL); + if (!hwmon) + return; + + i915->hwmon = hwmon; + mutex_init(&hwmon->hwmon_lock); + ddat = &hwmon->ddat; + + ddat->hwmon = hwmon; + ddat->uncore = &i915->uncore; + snprintf(ddat->name, sizeof(ddat->name), "i915"); + + hwm_get_preregistration_info(i915); + + /* hwmon_dev points to device hwmon<i> */ + hwmon_dev = hwmon_device_register_with_info(dev, ddat->name, + ddat, + &hwm_chip_info, + NULL); + if (IS_ERR(hwmon_dev)) { + mutex_destroy(&hwmon->hwmon_lock); + i915->hwmon = NULL; + kfree(hwmon); + return; + } + + ddat->hwmon_dev = hwmon_dev; +} + +void i915_hwmon_unregister(struct drm_i915_private *i915) +{ + struct i915_hwmon *hwmon; + struct hwm_drvdata *ddat; + + hwmon = fetch_and_zero(&i915->hwmon); + if (!hwmon) + return; + + ddat = &hwmon->ddat; + if (ddat->hwmon_dev) + hwmon_device_unregister(ddat->hwmon_dev); + + mutex_destroy(&hwmon->hwmon_lock); + kfree(hwmon); +} diff --git a/drivers/gpu/drm/i915/i915_hwmon.h b/drivers/gpu/drm/i915/i915_hwmon.h new file mode 100644 index 000000000000..7ca9cf2c34c9 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_hwmon.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: MIT */ + +/* + * Copyright © 2022 Intel Corporation + */ + +#ifndef __I915_HWMON_H__ +#define __I915_HWMON_H__ + +struct drm_i915_private; + +#if IS_REACHABLE(CONFIG_HWMON) +void i915_hwmon_register(struct drm_i915_private *i915); +void i915_hwmon_unregister(struct drm_i915_private *i915); +#else +static inline void i915_hwmon_register(struct drm_i915_private *i915) { }; +static inline void i915_hwmon_unregister(struct drm_i915_private *i915) { }; +#endif + +#endif /* __I915_HWMON_H__ */