thermal: intel: int340x_thermal: New IOCTLs for Passive v2 table

Export Passive version 2 table similar to the way _TRT and _ART tables
via IOCTLs.

This removes need for binary utility to read ACPI Passive 2 table by
providing open source support. This table already has open source
implementation in the user space thermald, when the table is part of
data vault exported by the int3400 sysfs.

This table is supported in some older platforms before Ice Lake
generation.

Passive 2 tables contain multiple entries. Each entry has following
fields:

 * Source: Named Reference (String). This is the source device for
   temperature.
 * Target: Named Reference (String). This is the target device to
   control.
 * Priority: Priority of this device compared to others.
 * SamplingPeriod: Time Period in 1/10 of seconds unit.
 * PassiveTemp: Passive Temperature in 1/10 of Kelvin.
 * SourceDomain: Domain for the source (00:Processor, others reserved).
 * ControlKnob: Type of control knob (00:Power Limit 1, others: reserved)
 * Limit: The target state to set on reaching passive temperature.
   This can be a string "max", "min" or a power limit value.
 * LimitStepSize: Step size during activation.
 * UnLimitStepSize: Step size during deactivation.
 * Reserved1: Reserved

Three IOCTLs are added similar to IOCTLs for reading TRT:

ACPI_THERMAL_GET_PSVT_COUNT: Number of passive 2 entries.
ACPI_THERMAL_GET_PSVT_LEN: Total return data size (count x each
  passive 2 entry size).
ACPI_THERMAL_GET_PSVT: Get the data as an array of objects with
  passive 2 entries.

This change is based on original development done by:
Todd Brandt <todd.e.brandt@linux.intel.com>

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[ rjw: Changelog and subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/thermal/intel/int340x_thermal/acpi_thermal_rel.h b/drivers/thermal/intel/int340x_thermal/acpi_thermal_rel.h
index 78d942477035..ac376d8f9ee4 100644
--- a/drivers/thermal/intel/int340x_thermal/acpi_thermal_rel.h
+++ b/drivers/thermal/intel/int340x_thermal/acpi_thermal_rel.h
@@ -14,6 +14,16 @@
 #define ACPI_THERMAL_GET_TRT	_IOR(ACPI_THERMAL_MAGIC, 5, unsigned long)
 #define ACPI_THERMAL_GET_ART	_IOR(ACPI_THERMAL_MAGIC, 6, unsigned long)
 
+/*
+ * ACPI_THERMAL_GET_PSVT_COUNT = Number of PSVT entries
+ * ACPI_THERMAL_GET_PSVT_LEN = Total return data size (PSVT count x each
+ * PSVT entry size)
+ * ACPI_THERMAL_GET_PSVT = Get the data as an array of psvt_objects
+ */
+#define ACPI_THERMAL_GET_PSVT_LEN _IOR(ACPI_THERMAL_MAGIC, 7, unsigned long)
+#define ACPI_THERMAL_GET_PSVT_COUNT _IOR(ACPI_THERMAL_MAGIC, 8, unsigned long)
+#define ACPI_THERMAL_GET_PSVT	_IOR(ACPI_THERMAL_MAGIC, 9, unsigned long)
+
 struct art {
 	acpi_handle source;
 	acpi_handle target;
@@ -43,6 +53,32 @@ struct trt {
 	u64 reserved4;
 } __packed;
 
+#define ACPI_NR_PSVT_ELEMENTS	12
+#define ACPI_PSVT_CONTROL_KNOB	7
+#define ACPI_LIMIT_STR_MAX_LEN	8
+
+struct psvt {
+	acpi_handle source;
+	acpi_handle target;
+	u64 priority;
+	u64 sample_period;
+	u64 passive_temp;
+	u64 source_domain;
+	u64 control_knob;
+	union {
+		/* For limit_type = ACPI_TYPE_INTEGER */
+		u64 integer;
+		/* For limit_type = ACPI_TYPE_STRING */
+		char string[ACPI_LIMIT_STR_MAX_LEN];
+		char *str_ptr;
+	} limit;
+	u64 step_size;
+	u64 limit_coeff;
+	u64 unlimit_coeff;
+	/* Spec calls this field reserved, so we borrow it for type info */
+	u64 control_knob_type; /* ACPI_TYPE_STRING or ACPI_TYPE_INTEGER */
+} __packed;
+
 #define ACPI_NR_ART_ELEMENTS 13
 /* for usrspace */
 union art_object {
@@ -77,6 +113,27 @@ union trt_object {
 	u64 __data[8];
 };
 
+union psvt_object {
+	struct {
+		char source_device[8];
+		char target_device[8];
+		u64 priority;
+		u64 sample_period;
+		u64 passive_temp;
+		u64 source_domain;
+		u64 control_knob;
+		union {
+			u64 integer;
+			char string[ACPI_LIMIT_STR_MAX_LEN];
+		} limit;
+		u64 step_size;
+		u64 limit_coeff;
+		u64 unlimit_coeff;
+		u64 control_knob_type;
+	};
+	u64 __data[ACPI_NR_PSVT_ELEMENTS];
+};
+
 #ifdef __KERNEL__
 int acpi_thermal_rel_misc_device_add(acpi_handle handle);
 int acpi_thermal_rel_misc_device_remove(acpi_handle handle);