/* Asymmetric public-key algorithm definitions * * See Documentation/crypto/asymmetric-keys.txt * * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #ifndef _LINUX_PUBLIC_KEY_H #define _LINUX_PUBLIC_KEY_H /* * Cryptographic data for the public-key subtype of the asymmetric key type. * * Note that this may include private part of the key as well as the public * part. */ struct public_key { void *key; u32 keylen; const char *id_type; const char *pkey_algo; }; extern void public_key_free(struct public_key *key); /* * Public key cryptography signature data */ struct public_key_signature { struct asymmetric_key_id *auth_ids[2]; u8 *s; /* Signature */ u32 s_size; /* Number of bytes in signature */ u8 *digest; u8 digest_size; /* Number of bytes in digest */ const char *pkey_algo; const char *hash_algo; }; extern void public_key_signature_free(struct public_key_signature *sig); extern struct asymmetric_key_subtype public_key_subtype; struct key; struct key_type; union key_payload; extern int restrict_link_by_signature(struct key *trust_keyring, const struct key_type *type, const union key_payload *payload); extern int verify_signature(const struct key *key, const struct public_key_signature *sig); int public_key_verify_signature(const struct public_key *pkey, const struct public_key_signature *sig); #endif /* _LINUX_PUBLIC_KEY_H */ i/linux/net-next.git/log/include/uapi/drm/vmwgfx_drm.h'>logtreecommitdiff
path: root/include/uapi/drm/vmwgfx_drm.h
diff options
context:
space:
mode:
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/uapi/drm/vmwgfx_drm.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/uapi/drm/vmwgfx_drm.h')