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platform/x86: ISST: Add SST-CP support via TPMI

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Intel Speed Select Technology Core Power (SST-CP) is an interface that
allows users to define per core priority. This defines a mechanism to
distribute power among cores when there is a power constrained
scenario. This defines a class of service (CLOS) configuration.

Three new IOCTLs are added:
ISST_IF_CORE_POWER_STATE : Enable/Disable SST-CP
ISST_IF_CLOS_PARAM : Configure CLOS parameters
ISST_IF_CLOS_ASSOC : Associate CPUs to a CLOS

To associate CPUs to CLOS, either Linux CPU numbering or PUNIT numbering
scheme can be used, using parameter punit_cpu_map (1: for PUNIT numbering
0 for Linux CPU number).

There is no change to IOCTL to get PUNIT CPU number for a CPU.

Introduce get_instance() function, which is used by majority of IOCTLs
processing to convert a socket and power domain to
tpmi_per_power_domain_info * instance. This instance has all the MMIO
offsets stored to read a particular field.

Once an instance is identified, read or write from correct MMIO
offset for a given field as defined in the specification.

For details on SST CP operations using intel-speed-selet utility,
refer to:
Documentation/admin-guide/pm/intel-speed-select.rst
under the kernel documentation

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Pragya Tanwar <pragya.tanwar@intel.com>
Link: https://lore.kernel.org/r/20230308070642.1727167-5-srinivas.pandruvada@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Srinivas Pandruvada
2023-03-07 23:06:38 -08:00
committed by Hans de Goede
parent 0ab147bb84
commit 12a7d2cb81
2 changed files with 343 additions and 0 deletions
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79
include/uapi/linux/isst_if.h
View File

@@ -163,6 +163,82 @@ struct isst_if_msr_cmds {
struct isst_if_msr_cmd msr_cmd[1];
};
/**
* struct isst_core_power - Structure to get/set core_power feature
* @get_set: 0: Get, 1: Set
* @socket_id: Socket/package id
* @power_domain: Power Domain id
* @enable: Feature enable status
* @priority_type: Priority type for the feature (ordered/proportional)
*
* Structure to get/set core_power feature state using IOCTL
* ISST_IF_CORE_POWER_STATE.
*/
struct isst_core_power {
__u8 get_set;
__u8 socket_id;
__u8 power_domain_id;
__u8 enable;
__u8 supported;
__u8 priority_type;
};
/**
* struct isst_clos_param - Structure to get/set clos praram
* @get_set: 0: Get, 1: Set
* @socket_id: Socket/package id
* @power_domain: Power Domain id
* clos: Clos ID for the parameters
* min_freq_mhz: Minimum frequency in MHz
* max_freq_mhz: Maximum frequency in MHz
* prop_prio: Proportional priority from 0-15
*
* Structure to get/set per clos property using IOCTL
* ISST_IF_CLOS_PARAM.
*/
struct isst_clos_param {
__u8 get_set;
__u8 socket_id;
__u8 power_domain_id;
__u8 clos;
__u16 min_freq_mhz;
__u16 max_freq_mhz;
__u8 prop_prio;
};
/**
* struct isst_if_clos_assoc - Structure to assign clos to a CPU
* @socket_id: Socket/package id
* @power_domain: Power Domain id
* @logical_cpu: CPU number
* @clos: Clos ID to assign to the logical CPU
*
* Structure to get/set core_power feature.
*/
struct isst_if_clos_assoc {
__u8 socket_id;
__u8 power_domain_id;
__u16 logical_cpu;
__u16 clos;
};
/**
* struct isst_if_clos_assoc_cmds - Structure to assign clos to CPUs
* @cmd_count: Number of cmds (cpus) in this request
* @get_set: Request is for get or set
* @punit_cpu_map: Set to 1 if the CPU number is punit numbering not
* Linux CPU number
*
* Structure used to get/set associate CPUs to clos using IOCTL
* ISST_IF_CLOS_ASSOC.
*/
struct isst_if_clos_assoc_cmds {
__u16 cmd_count;
__u16 get_set;
__u16 punit_cpu_map;
struct isst_if_clos_assoc assoc_info[1];
};
/**
* struct isst_tpmi_instance_count - Get number of TPMI instances per socket
* @socket_id: Socket/package id
@@ -186,5 +262,8 @@ struct isst_tpmi_instance_count {
#define ISST_IF_MSR_COMMAND _IOWR(ISST_IF_MAGIC, 4, struct isst_if_msr_cmds *)
#define ISST_IF_COUNT_TPMI_INSTANCES _IOR(ISST_IF_MAGIC, 5, struct isst_tpmi_instance_count *)
#define ISST_IF_CORE_POWER_STATE _IOWR(ISST_IF_MAGIC, 6, struct isst_core_power *)
#define ISST_IF_CLOS_PARAM _IOWR(ISST_IF_MAGIC, 7, struct isst_clos_param *)
#define ISST_IF_CLOS_ASSOC _IOWR(ISST_IF_MAGIC, 8, struct isst_if_clos_assoc_cmds *)
#endif