/************************************************************************
*
* io_edgeport.h Edgeport Linux Interface definitions
*
* Copyright (C) 2000 Inside Out Networks, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*
************************************************************************/
#if !defined(_IO_EDGEPORT_H_)
#define _IO_EDGEPORT_H_
#define MAX_RS232_PORTS 8 /* Max # of RS-232 ports per device */
/* typedefs that the insideout headers need */
#ifndef LOW8
#define LOW8(a) ((unsigned char)(a & 0xff))
#endif
#ifndef HIGH8
#define HIGH8(a) ((unsigned char)((a & 0xff00) >> 8))
#endif
#ifndef __KERNEL__
#define __KERNEL__
#endif
#include "io_usbvend.h"
/* The following table is used to map the USBx port number to
* the device serial number (or physical USB path), */
#define MAX_EDGEPORTS 64
struct comMapper {
char SerialNumber[MAX_SERIALNUMBER_LEN+1]; /* Serial number/usb path */
int numPorts; /* Number of ports */
int Original[MAX_RS232_PORTS]; /* Port numbers set by IOCTL */
int Port[MAX_RS232_PORTS]; /* Actual used port numbers */
};
#define EDGEPORT_CONFIG_DEVICE "/proc/edgeport"
/* /proc/edgeport Interface
* This interface uses read/write/lseek interface to talk to the edgeport driver
* the following read functions are supported: */
#define PROC_GET_MAPPING_TO_PATH 1
#define PROC_GET_COM_ENTRY 2
#define PROC_GET_EDGE_MANUF_DESCRIPTOR 3
#define PROC_GET_BOOT_DESCRIPTOR 4
#define PROC_GET_PRODUCT_INFO 5
#define PROC_GET_STRINGS 6
#define PROC_GET_CURRENT_COM_MAPPING 7
/* The parameters to the lseek() for the read is: */
#define PROC_READ_SETUP(Command, Argument) ((Command) + ((Argument)<<8))
/* the following write functions are supported: */
#define PROC_SET_COM_MAPPING 1
#define PROC_SET_COM_ENTRY 2
/* The following structure is passed to the write */
struct procWrite {
int Command;
union {
struct comMapper Entry;
int ComMappingBasedOnUSBPort; /* Boolean value */
} u;
};
/*
* Product information read from the Edgeport
*/
struct edgeport_product_info {
__u16 ProductId; /* Product Identifier */
__u8 NumPorts; /* Number of ports on edgeport */
__u8 ProdInfoVer; /* What version of structure is this? */
__u32 IsServer :1; /* Set if Server */
__u32 IsRS232 :1; /* Set if RS-232 ports exist */
__u32 IsRS422 :1; /* Set if RS-422 ports exist */
__u32 IsRS485 :1; /* Set if RS-485 ports exist */
__u32 IsReserved :28; /* Reserved for later expansion */
__u8 RomSize; /* Size of ROM/E2PROM in K */
__u8 RamSize; /* Size of external RAM in K */
__u8 CpuRev; /* CPU revision level (chg only if s/w visible) */
__u8 BoardRev; /* PCB revision level (chg only if s/w visible) */
__u8 BootMajorVersion; /* Boot Firmware version: xx. */
__u8 BootMinorVersion; /* yy. */
__le16 BootBuildNumber; /* zzzz (LE format) */
__u8 FirmwareMajorVersion; /* Operational Firmware version:xx. */
__u8 FirmwareMinorVersion; /* yy. */
__le16 FirmwareBuildNumber; /* zzzz (LE format) */
__u8 ManufactureDescDate[3]; /* MM/DD/YY when descriptor template was compiled */
__u8 HardwareType;
__u8 iDownloadFile; /* What to download to EPiC device */
__u8 EpicVer; /* What version of EPiC spec this device supports */
struct edge_compatibility_bits Epic;
};
/*
* Edgeport Stringblock String locations
*/
#define EDGESTRING_MANUFNAME 1 /* Manufacture Name */
#define EDGESTRING_PRODNAME 2 /* Product Name */
#define EDGESTRING_SERIALNUM 3 /* Serial Number */
#define EDGESTRING_ASSEMNUM 4 /* Assembly Number */
#define EDGESTRING_OEMASSEMNUM 5 /* OEM Assembly Number */
#define EDGESTRING_MANUFDATE 6 /* Manufacture Date */
#define EDGESTRING_ORIGSERIALNUM 7 /* Serial Number */
struct string_block {
__u16 NumStrings; /* Number of strings in block */
__u16 Strings[1]; /* Start of string block */
};
#endif
alue='1'>ignore
cpufreq: intel_pstate: Disable energy efficiency optimization
Some Kabylake desktop processors may not reach max turbo when running in
HWP mode, even if running under sustained 100% utilization.
This occurs when the HWP.EPP (Energy Performance Preference) is set to
"balance_power" (0x80) -- the default on most systems.
It occurs because the platform BIOS may erroneously enable an
energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not
recommended to be enabled on this SKU.
On the failing systems, this BIOS issue was not discovered when the
desktop motherboard was tested with Windows, because the BIOS also
neglects to provide the ACPI/CPPC table, that Windows requires to enable
HWP, and so Windows runs in legacy P-state mode, where this setting has
no effect.
Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and
so it runs in HWP mode, exposing this incorrect BIOS configuration.
There are several ways to address this problem.
First, Linux can also run in legacy P-state mode on this system.
As intel_pstate is how Linux enables HWP, booting with
"intel_pstate=disable"
will run in acpi-cpufreq/ondemand legacy p-state mode.
Or second, the "performance" governor can be used with intel_pstate,
which will modify HWP.EPP to 0.
Or third, starting in 4.10, the
/sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
attribute in can be updated from "balance_power" to "performance".
Or fourth, apply this patch, which fixes the erroneous setting of
MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default
configuration to function as designed.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Len Brown <len.brown@intel.com>
Cc: 4.6+ <stable@vger.kernel.org> # 4.6+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>