/* * Copyright 2015, Cyril Bur, IBM Corp. * * 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. */ #include "basic_asm.h" #include "vsx_asm.h" #long check_vsx(vector int *r3); #This function wraps storeing VSX regs to the end of an array and a #call to a comparison function in C which boils down to a memcmp() FUNC_START(check_vsx) PUSH_BASIC_STACK(32) std r3,STACK_FRAME_PARAM(0)(sp) addi r3, r3, 16 * 12 #Second half of array bl store_vsx ld r3,STACK_FRAME_PARAM(0)(sp) bl vsx_memcmp POP_BASIC_STACK(32) blr FUNC_END(check_vsx) # int preempt_vmx(vector int *varray, int *threads_starting, # int *running); # On starting will (atomically) decrement threads_starting as a signal # that the VMX have been loaded with varray. Will proceed to check the # validity of the VMX registers while running is not zero. FUNC_START(preempt_vsx) PUSH_BASIC_STACK(512) std r3,STACK_FRAME_PARAM(0)(sp) # vector int *varray std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting std r5,STACK_FRAME_PARAM(2)(sp) # int *running bl load_vsx nop sync # Atomic DEC ld r3,STACK_FRAME_PARAM(1)(sp) 1: lwarx r4,0,r3 addi r4,r4,-1 stwcx. r4,0,r3 bne- 1b 2: ld r3,STACK_FRAME_PARAM(0)(sp) bl check_vsx nop cmpdi r3,0 bne 3f ld r4,STACK_FRAME_PARAM(2)(sp) ld r5,0(r4) cmpwi r5,0 bne 2b 3: POP_BASIC_STACK(512) blr FUNC_END(preempt_vsx) i/linux/net-next.git/?h=nds-private-remove'>summaryrefslogtreecommitdiff
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 23:58:38 +0100
committerIngo Molnar <mingo@kernel.org>2017-02-01 08:37:27 +0100
commitdd86e373e09fb16b83e8adf5c48c421a4ca76468 (patch)
tree55703c2ea8584e303e342090614e0aab3509ab21 /net/l2tp/Makefile
parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/l2tp/Makefile')