#ifndef _SCSI_IOCTL_H #define _SCSI_IOCTL_H #define SCSI_IOCTL_SEND_COMMAND 1 #define SCSI_IOCTL_TEST_UNIT_READY 2 #define SCSI_IOCTL_BENCHMARK_COMMAND 3 #define SCSI_IOCTL_SYNC 4 /* Request synchronous parameters */ #define SCSI_IOCTL_START_UNIT 5 #define SCSI_IOCTL_STOP_UNIT 6 /* The door lock/unlock constants are compatible with Sun constants for the cdrom */ #define SCSI_IOCTL_DOORLOCK 0x5380 /* lock the eject mechanism */ #define SCSI_IOCTL_DOORUNLOCK 0x5381 /* unlock the mechanism */ #define SCSI_REMOVAL_PREVENT 1 #define SCSI_REMOVAL_ALLOW 0 #ifdef __KERNEL__ struct scsi_device; /* * Structures used for scsi_ioctl et al. */ typedef struct scsi_ioctl_command { unsigned int inlen; unsigned int outlen; unsigned char data[0]; } Scsi_Ioctl_Command; typedef struct scsi_idlun { __u32 dev_id; __u32 host_unique_id; } Scsi_Idlun; /* Fibre Channel WWN, port_id struct */ typedef struct scsi_fctargaddress { __u32 host_port_id; unsigned char host_wwn[8]; // include NULL term. } Scsi_FCTargAddress; int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd, bool ndelay); extern int scsi_ioctl(struct scsi_device *, int, void __user *); #endif /* __KERNEL__ */ #endif /* _SCSI_IOCTL_H */ tion value='packet-loop-back'>packet-loop-back net-next plumbingsTobias Klauser
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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2017-02-03 14:18:39 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-02-04 00:11:08 +0100
commit6e978b22efa1db9f6e71b24440b5f1d93e968ee3 (patch)
treec666f7a26b860674848949e39a610222b0723f89 /include/scsi/scsi_driver.h
parent3c223c19aea85d3dda1416c187915f4a30b04b1f (diff)
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>
Diffstat (limited to 'include/scsi/scsi_driver.h')