linux/arch/powerpc/platforms/wsp/smp.c

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/*
* SMP Support for A2 platforms
*
* Copyright 2007 Benjamin Herrenschmidt, 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 <linux/cpumask.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/smp.h>
#include <asm/dbell.h>
#include <asm/machdep.h>
#include <asm/xics.h>
#include "ics.h"
#include "wsp.h"
static void __devinit smp_a2_setup_cpu(int cpu)
{
doorbell_setup_this_cpu();
if (cpu != boot_cpuid)
xics_setup_cpu();
}
int __devinit smp_a2_kick_cpu(int nr)
{
const char *enable_method;
struct device_node *np;
int thr_idx;
if (nr < 0 || nr >= NR_CPUS)
return -ENOENT;
np = of_get_cpu_node(nr, &thr_idx);
if (!np)
return -ENODEV;
enable_method = of_get_property(np, "enable-method", NULL);
pr_devel("CPU%d has enable-method: \"%s\"\n", nr, enable_method);
if (!enable_method) {
printk(KERN_ERR "CPU%d has no enable-method\n", nr);
return -ENOENT;
} else if (strcmp(enable_method, "ibm,a2-scom") == 0) {
if (a2_scom_startup_cpu(nr, thr_idx, np))
return -1;
} else {
printk(KERN_ERR "CPU%d: Don't understand enable-method \"%s\"\n",
nr, enable_method);
return -EINVAL;
}
/*
* The processor is currently spinning, waiting for the
* cpu_start field to become non-zero After we set cpu_start,
* the processor will continue on to secondary_start
*/
paca[nr].cpu_start = 1;
return 0;
}
static int __init smp_a2_probe(void)
{
return cpus_weight(cpu_possible_map);
}
static struct smp_ops_t a2_smp_ops = {
powerpc: Consolidate ipi message mux and demux 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>
2011-05-11 03:29:39 +08:00
.message_pass = smp_muxed_ipi_message_pass,
.cause_ipi = doorbell_cause_ipi,
.probe = smp_a2_probe,
.kick_cpu = smp_a2_kick_cpu,
.setup_cpu = smp_a2_setup_cpu,
};
void __init a2_setup_smp(void)
{
smp_ops = &a2_smp_ops;
}