drm/xe/hwmon: Add infra to support card power and energy attributes

Add infra to support card power and energy attributes through channel 0.
Package attributes will be now exposed through channel 1 rather than
channel 0 as shown below.

Channel 0 i.e power1/energy1_xxx used for card and
channel 1 i.e power2/energy2_xxx used for package power,energy attributes.

power1/curr1_crit and in0_input are moved to channel 1, i.e.
power2/curr2_crit and in1_input as these are available for package only.

This would be needed for future platforms where they might be
separate registers for package and card power and energy.

Each discrete GPU supported by Xe driver, would have a directory in
/sys/class/hwmon/ with multiple channels under it.
Each channel would have attributes for power, energy etc.

Ex: /sys/class/hwmon/hwmon2/power1_max
                           /power1_label
                           /energy1_input
                           /energy1_label

Attributes will have a label to get more description of it.
Labelling is as below.
		power1_label/energy1_label - "card",
		power2_label/energy2_label - "pkg".

v2: Fix checkpatch errors.

v3:
 - Update intel-xe-hwmon documentation. (Riana, Badal)
 - Rename hwmon card channel enum from CHANNEL_PLATFORM
   to CHANNEL_CARD. (Riana)

v4:
 - Remove unrelated changes from patch. (Anshuman)
 - Fix typo in commit msg.

v5:
 - Update commit message and intel-xe-hwmon documentation with "Xe"
   instead of xe when using it as a name. (Rodrigo)

Signed-off-by: Karthik Poosa <[email protected]>
Reviewed-by: Badal Nilawar <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

Author: kpoosa

Documentation/ABI/testing/sysfs-driver-intel-xe-hwmon

@@ -10,61 +10,101 @@ Description:	RW. Card reactive sustained  (PL1) power limit in microwatts.
 		power limit is disabled, writing 0 disables the
 		limit. Writing values > 0 and <= TDP will enable the power limit.
 
-		Only supported for particular Intel xe graphics platforms.
+		Only supported for particular Intel Xe graphics platforms.
 
 What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_rated_max
 Date:		September 2023
 KernelVersion:	6.5
 Contact:	[email protected]
 Description:	RO. Card default power limit (default TDP setting).
 
-		Only supported for particular Intel xe graphics platforms.
+		Only supported for particular Intel Xe graphics platforms.
 
-What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_crit
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/energy1_input
 Date:		September 2023
 KernelVersion:	6.5
 Contact:	[email protected]
-Description:	RW. Card reactive critical (I1) power limit in microwatts.
+Description:	RO. Card energy input of device in microjoules.
+
+		Only supported for particular Intel Xe graphics platforms.
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_max_interval
+Date:		October 2023
+KernelVersion:	6.6
+Contact:	[email protected]
+Description:	RW. Card sustained power limit interval (Tau in PL1/Tau) in
+		milliseconds over which sustained power is averaged.
+
+		Only supported for particular Intel Xe graphics platforms.
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_max
+Date:		February 2024
+KernelVersion:	6.8
+Contact:	[email protected]
+Description:	RW. Package reactive sustained  (PL1) 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 and <= TDP will enable the power limit.
+
+		Only supported for particular Intel Xe graphics platforms.
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_rated_max
+Date:		February 2024
+KernelVersion:	6.8
+Contact:	[email protected]
+Description:	RO. Package default power limit (default TDP setting).
 
-		Card reactive critical (I1) power limit in microwatts is exposed
+		Only supported for particular Intel Xe graphics platforms.
+
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_crit
+Date:		February 2024
+KernelVersion:	6.8
+Contact:	[email protected]
+Description:	RW. Package reactive critical (I1) power limit in microwatts.
+
+		Package reactive critical (I1) power limit in microwatts is exposed
 		for client products. The power controller will throttle the
 		operating frequency if the power averaged over a window exceeds
 		this limit.
 
-		Only supported for particular Intel xe graphics platforms.
+		Only supported for particular Intel Xe graphics platforms.
 
-What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/curr1_crit
-Date:		September 2023
-KernelVersion:	6.5
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/curr2_crit
+Date:		February 2024
+KernelVersion:	6.8
 Contact:	[email protected]
-Description:	RW. Card reactive critical (I1) power limit in milliamperes.
+Description:	RW. Package reactive critical (I1) power limit in milliamperes.
 
-		Card reactive critical (I1) power limit in milliamperes is
+		Package reactive critical (I1) power limit in milliamperes is
 		exposed for server products. The power controller will throttle
 		the operating frequency if the power averaged over a window
 		exceeds this limit.
 
-What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/in0_input
-Date:		September 2023
-KernelVersion:	6.5
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/energy2_input
+Date:		February 2024
+KernelVersion:	6.8
 Contact:	[email protected]
-Description:	RO. Current Voltage in millivolt.
+Description:	RO. Package energy input of device in microjoules.
 
-		Only supported for particular Intel xe graphics platforms.
+		Only supported for particular Intel Xe graphics platforms.
 
-What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/energy1_input
-Date:		September 2023
-KernelVersion:	6.5
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power2_max_interval
+Date:		February 2024
+KernelVersion:	6.8
 Contact:	[email protected]
-Description:	RO. Energy input of device in microjoules.
+Description:	RW. Package sustained power limit interval (Tau in PL1/Tau) in
+		milliseconds over which sustained power is averaged.
 
-		Only supported for particular Intel xe graphics platforms.
+		Only supported for particular Intel Xe graphics platforms.
 
-What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/power1_max_interval
-Date:		October 2023
-KernelVersion:	6.6
+What:		/sys/bus/pci/drivers/xe/.../hwmon/hwmon<i>/in1_input
+Date:		February 2024
+KernelVersion:	6.8
 Contact:	[email protected]
-Description:	RW. Sustained power limit interval (Tau in PL1/Tau) in
-		milliseconds over which sustained power is averaged.
+Description:	RO. Package current voltage in millivolt.
 
-		Only supported for particular Intel xe graphics platforms.
+		Only supported for particular Intel Xe graphics platforms.