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23d72bfd8f
Consolidate the mux and demux of ipi messages into smp.c and call a new smp_ops callback to actually trigger the ipi. The powerpc architecture code is optimised for having 4 distinct ipi triggers, which are mapped to 4 distinct messages (ipi many, ipi single, scheduler ipi, and enter debugger). However, several interrupt controllers only provide a single software triggered interrupt that can be delivered to each cpu. To resolve this limitation, each smp_ops implementation created a per-cpu variable that is manipulated with atomic bitops. Since these lines will be contended they are optimialy marked as shared_aligned and take a full cache line for each cpu. Distro kernels may have 2 or 3 of these in their config, each taking per-cpu space even though at most one will be in use. This consolidation removes smp_message_recv and replaces the single call actions cases with direct calls from the common message recognition loop. The complicated debugger ipi case with its muxed crash handling code is moved to debug_ipi_action which is now called from the demux code (instead of the multi-message action calling smp_message_recv). I put a call to reschedule_action to increase the likelyhood of correctly merging the anticipated scheduler_ipi() hook coming from the scheduler tree; that single required call can be inlined later. The actual message decode is a copy of the old pseries xics code with its memory barriers and cache line spacing, augmented with a per-cpu unsigned long based on the book-e doorbell code. The optional data is set via a callback from the implementation and is passed to the new cause-ipi hook along with the logical cpu number. While currently only the doorbell implemntation uses this data it should be almost zero cost to retrieve and pass it -- it adds a single register load for the argument from the same cache line to which we just completed a store and the register is dead on return from the call. I extended the data element from unsigned int to unsigned long in case some other code wanted to associate a pointer. The doorbell check_self is replaced by a call to smp_muxed_ipi_resend, conditioned on the CPU_DBELL feature. The ifdef guard could be relaxed to CONFIG_SMP but I left it with BOOKE for now. Also, the doorbell interrupt vector for book-e was not calling irq_enter and irq_exit, which throws off cpu accounting and causes code to not realize it is running in interrupt context. Add the missing calls. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/*
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* SMP support for iSeries machines.
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*
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* Dave Engebretsen, Peter Bergner, and
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* Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
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*
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* Plus various changes from other IBM teams...
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/cache.h>
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#include <linux/err.h>
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <asm/ptrace.h>
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#include <asm/atomic.h>
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#include <asm/irq.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/paca.h>
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#include <asm/iseries/hv_call.h>
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#include <asm/time.h>
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#include <asm/machdep.h>
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#include <asm/cputable.h>
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#include <asm/system.h>
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static void smp_iSeries_cause_ipi(int cpu, unsigned long data)
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{
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HvCall_sendIPI(&(paca[cpu]));
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}
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static int smp_iSeries_probe(void)
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{
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return cpumask_weight(cpu_possible_mask);
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}
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static int smp_iSeries_kick_cpu(int nr)
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{
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BUG_ON((nr < 0) || (nr >= NR_CPUS));
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/* Verify that our partition has a processor nr */
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if (lppaca_of(nr).dyn_proc_status >= 2)
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return -ENOENT;
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/* The processor is currently spinning, waiting
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* for the cpu_start field to become non-zero
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* After we set cpu_start, the processor will
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* continue on to secondary_start in iSeries_head.S
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*/
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paca[nr].cpu_start = 1;
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return 0;
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}
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static void __devinit smp_iSeries_setup_cpu(int nr)
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{
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}
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static struct smp_ops_t iSeries_smp_ops = {
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.message_pass = smp_muxed_ipi_message_pass,
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.cause_ipi = smp_iSeries_cause_ipi,
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.probe = smp_iSeries_probe,
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.kick_cpu = smp_iSeries_kick_cpu,
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.setup_cpu = smp_iSeries_setup_cpu,
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};
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/* This is called very early. */
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void __init smp_init_iSeries(void)
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{
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smp_ops = &iSeries_smp_ops;
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}
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