#ifndef _DCCP_FEAT_H #define _DCCP_FEAT_H /* * net/dccp/feat.h * * Feature negotiation for the DCCP protocol (RFC 4340, section 6) * Copyright (c) 2008 Gerrit Renker * Copyright (c) 2005 Andrea Bittau * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include "dccp.h" /* * Known limit values */ /* Ack Ratio takes 2-byte integer values (11.3) */ #define DCCPF_ACK_RATIO_MAX 0xFFFF /* Wmin=32 and Wmax=2^46-1 from 7.5.2 */ #define DCCPF_SEQ_WMIN 32 #define DCCPF_SEQ_WMAX 0x3FFFFFFFFFFFull /* Maximum number of SP values that fit in a single (Confirm) option */ #define DCCP_FEAT_MAX_SP_VALS (DCCP_SINGLE_OPT_MAXLEN - 2) enum dccp_feat_type { FEAT_AT_RX = 1, /* located at RX side of half-connection */ FEAT_AT_TX = 2, /* located at TX side of half-connection */ FEAT_SP = 4, /* server-priority reconciliation (6.3.1) */ FEAT_NN = 8, /* non-negotiable reconciliation (6.3.2) */ FEAT_UNKNOWN = 0xFF /* not understood or invalid feature */ }; enum dccp_feat_state { FEAT_DEFAULT = 0, /* using default values from 6.4 */ FEAT_INITIALISING, /* feature is being initialised */ FEAT_CHANGING, /* Change sent but not confirmed yet */ FEAT_UNSTABLE, /* local modification in state CHANGING */ FEAT_STABLE /* both ends (think they) agree */ }; /** * dccp_feat_val - Container for SP or NN feature values * @nn: single NN value * @sp.vec: single SP value plus optional preference list * @sp.len: length of @sp.vec in bytes */ typedef union { u64 nn; struct { u8 *vec; u8 len; } sp; } dccp_feat_val; /** * struct feat_entry - Data structure to perform feature negotiation * @val: feature's current value (SP features may have preference list) * @state: feature's current state * @feat_num: one of %dccp_feature_numbers * @needs_mandatory: whether Mandatory options should be sent * @needs_confirm: whether to send a Confirm instead of a Change * @empty_confirm: whether to send an empty Confirm (depends on @needs_confirm) * @is_local: feature location (1) or feature-remote (0) * @node: list pointers, entries arranged in FIFO order */ struct dccp_feat_entry { dccp_feat_val val; enum dccp_feat_state state:8; u8 feat_num; bool needs_mandatory, needs_confirm, empty_confirm, is_local; struct list_head node; }; static inline u8 dccp_feat_genopt(struct dccp_feat_entry *entry) { if (entry->needs_confirm) return entry->is_local ? DCCPO_CONFIRM_L : DCCPO_CONFIRM_R; return entry->is_local ? DCCPO_CHANGE_L : DCCPO_CHANGE_R; } /** * struct ccid_dependency - Track changes resulting from choosing a CCID * @dependent_feat: one of %dccp_feature_numbers * @is_local: local (1) or remote (0) @dependent_feat * @is_mandatory: whether presence of @dependent_feat is mission-critical or not * @val: corresponding default value for @dependent_feat (u8 is sufficient here) */ struct ccid_dependency { u8 dependent_feat; bool is_local:1, is_mandatory:1; u8 val; }; /* * Sysctls to seed defaults for feature negotiation */ extern unsigned long sysctl_dccp_sequence_window; extern int sysctl_dccp_rx_ccid; extern int sysctl_dccp_tx_ccid; int dccp_feat_init(struct sock *sk); void dccp_feat_initialise_sysctls(void); int dccp_feat_register_sp(struct sock *sk, u8 feat, u8 is_local, u8 const *list, u8 len); int dccp_feat_parse_options(struct sock *, struct dccp_request_sock *, u8 mand, u8 opt, u8 feat, u8 *val, u8 len); int dccp_feat_clone_list(struct list_head const *, struct list_head *); /* * Encoding variable-length options and their maximum length. * * This affects NN options (SP options are all u8) and other variable-length * options (see table 3 in RFC 4340). The limit is currently given the Sequence * Window NN value (sec. 7.5.2) and the NDP count (sec. 7.7) option, all other * options consume less than 6 bytes (timestamps are 4 bytes). * When updating this constant (e.g. due to new internet drafts / RFCs), make * sure that you also update all code which refers to it. */ #define DCCP_OPTVAL_MAXLEN 6 void dccp_encode_value_var(const u64 value, u8 *to, const u8 len); u64 dccp_decode_value_var(const u8 *bf, const u8 len); u64 dccp_feat_nn_get(struct sock *sk, u8 feat); int dccp_insert_option_mandatory(struct sk_buff *skb); int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat, u8 *val, u8 len, bool repeat_first); #endif /* _DCCP_FEAT_H */ form>
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 /sound/firewire/dice/dice.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 'sound/firewire/dice/dice.h')