| /* |
| * SMP support for iSeries machines. |
| * |
| * Dave Engebretsen, Peter Bergner, and |
| * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com |
| * |
| * Plus various changes from other IBM teams... |
| * |
| * 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. |
| */ |
| |
| #undef DEBUG |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/smp.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/cache.h> |
| #include <linux/err.h> |
| #include <linux/sysdev.h> |
| #include <linux/cpu.h> |
| |
| #include <asm/ptrace.h> |
| #include <asm/atomic.h> |
| #include <asm/irq.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/io.h> |
| #include <asm/smp.h> |
| #include <asm/paca.h> |
| #include <asm/iseries/hv_call.h> |
| #include <asm/time.h> |
| #include <asm/machdep.h> |
| #include <asm/cputable.h> |
| #include <asm/system.h> |
| |
| #include "smp.h" |
| |
| static unsigned long iSeries_smp_message[NR_CPUS]; |
| |
| void iSeries_smp_message_recv(void) |
| { |
| int cpu = smp_processor_id(); |
| int msg; |
| |
| if (num_online_cpus() < 2) |
| return; |
| |
| for (msg = 0; msg < 4; msg++) |
| if (test_and_clear_bit(msg, &iSeries_smp_message[cpu])) |
| smp_message_recv(msg); |
| } |
| |
| static inline void smp_iSeries_do_message(int cpu, int msg) |
| { |
| set_bit(msg, &iSeries_smp_message[cpu]); |
| HvCall_sendIPI(&(paca[cpu])); |
| } |
| |
| static void smp_iSeries_message_pass(int target, int msg) |
| { |
| int i; |
| |
| if (target < NR_CPUS) |
| smp_iSeries_do_message(target, msg); |
| else { |
| for_each_online_cpu(i) { |
| if ((target == MSG_ALL_BUT_SELF) && |
| (i == smp_processor_id())) |
| continue; |
| smp_iSeries_do_message(i, msg); |
| } |
| } |
| } |
| |
| static int smp_iSeries_probe(void) |
| { |
| return cpumask_weight(cpu_possible_mask); |
| } |
| |
| static int smp_iSeries_kick_cpu(int nr) |
| { |
| BUG_ON((nr < 0) || (nr >= NR_CPUS)); |
| |
| /* Verify that our partition has a processor nr */ |
| if (lppaca_of(nr).dyn_proc_status >= 2) |
| return -ENOENT; |
| |
| /* 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 in iSeries_head.S |
| */ |
| paca[nr].cpu_start = 1; |
| |
| return 0; |
| } |
| |
| static void __devinit smp_iSeries_setup_cpu(int nr) |
| { |
| } |
| |
| static struct smp_ops_t iSeries_smp_ops = { |
| .message_pass = smp_iSeries_message_pass, |
| .probe = smp_iSeries_probe, |
| .kick_cpu = smp_iSeries_kick_cpu, |
| .setup_cpu = smp_iSeries_setup_cpu, |
| }; |
| |
| /* This is called very early. */ |
| void __init smp_init_iSeries(void) |
| { |
| smp_ops = &iSeries_smp_ops; |
| } |