Release 4.14 arch/mips/sibyte/sb1250/smp.c
/*
* Copyright (C) 2001, 2002, 2003 Broadcom Corporation
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/kernel_stat.h>
#include <linux/sched/task_stack.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/fw/cfe/cfe_api.h>
#include <asm/sibyte/sb1250.h>
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_int.h>
static void *mailbox_set_regs[] = {
IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_SET_CPU),
IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_SET_CPU)
};
static void *mailbox_clear_regs[] = {
IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CLR_CPU),
IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CLR_CPU)
};
static void *mailbox_regs[] = {
IOADDR(A_IMR_CPU0_BASE + R_IMR_MAILBOX_CPU),
IOADDR(A_IMR_CPU1_BASE + R_IMR_MAILBOX_CPU)
};
/*
* SMP init and finish on secondary CPUs
*/
void sb1250_smp_init(void)
{
unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
STATUSF_IP1 | STATUSF_IP0;
/* Set interrupt mask, but don't enable */
change_c0_status(ST0_IM, imask);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Morton | 29 | 100.00% | 1 | 100.00% |
| Total | 29 | 100.00% | 1 | 100.00% |
/*
* These are routines for dealing with the sb1250 smp capabilities
* independent of board/firmware
*/
/*
* Simple enough; everything is set up, so just poke the appropriate mailbox
* register, and we should be set
*/
static void sb1250_send_ipi_single(int cpu, unsigned int action)
{
__raw_writeq((((u64)action) << 48), mailbox_set_regs[cpu]);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static inline void sb1250_send_ipi_mask(const struct cpumask *mask,
unsigned int action)
{
unsigned int i;
for_each_cpu(i, mask)
sb1250_send_ipi_single(i, action);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 29 | 85.29% | 1 | 50.00% |
| Rusty Russell | 5 | 14.71% | 1 | 50.00% |
| Total | 34 | 100.00% | 2 | 100.00% |
/*
* Code to run on secondary just after probing the CPU
*/
static void sb1250_init_secondary(void)
{
extern void sb1250_smp_init(void);
sb1250_smp_init();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
/*
* Do any tidying up before marking online and running the idle
* loop
*/
static void sb1250_smp_finish(void)
{
extern void sb1250_clockevent_init(void);
sb1250_clockevent_init();
local_irq_enable();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Morton | 18 | 85.71% | 1 | 33.33% |
| Ralf Bächle | 3 | 14.29% | 2 | 66.67% |
| Total | 21 | 100.00% | 3 | 100.00% |
/*
* Setup the PC, SP, and GP of a secondary processor and start it
* running!
*/
static int sb1250_boot_secondary(int cpu, struct task_struct *idle)
{
int retval;
retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap,
__KSTK_TOS(idle),
(unsigned long)task_thread_info(idle), 0);
if (retval != 0)
printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
return retval;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 60 | 93.75% | 2 | 66.67% |
| Paul Burton | 4 | 6.25% | 1 | 33.33% |
| Total | 64 | 100.00% | 3 | 100.00% |
/*
* Use CFE to find out how many CPUs are available, setting up
* cpu_possible_mask and the logical/physical mappings.
* XXXKW will the boot CPU ever not be physical 0?
*
* Common setup before any secondaries are started
*/
static void __init sb1250_smp_setup(void)
{
int i, num;
init_cpu_possible(cpumask_of(0));
__cpu_number_map[0] = 0;
__cpu_logical_map[0] = 0;
for (i = 1, num = 0; i < NR_CPUS; i++) {
if (cfe_cpu_stop(i) == 0) {
set_cpu_possible(i, true);
__cpu_number_map[i] = ++num;
__cpu_logical_map[num] = i;
}
}
printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 91 | 94.79% | 2 | 66.67% |
| Rusty Russell | 5 | 5.21% | 1 | 33.33% |
| Total | 96 | 100.00% | 3 | 100.00% |
static void __init sb1250_prepare_cpus(unsigned int max_cpus)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 10 | 100.00% | 1 | 100.00% |
| Total | 10 | 100.00% | 1 | 100.00% |
const struct plat_smp_ops sb_smp_ops = {
.send_ipi_single = sb1250_send_ipi_single,
.send_ipi_mask = sb1250_send_ipi_mask,
.init_secondary = sb1250_init_secondary,
.smp_finish = sb1250_smp_finish,
.boot_secondary = sb1250_boot_secondary,
.smp_setup = sb1250_smp_setup,
.prepare_cpus = sb1250_prepare_cpus,
};
void sb1250_mailbox_interrupt(void)
{
int cpu = smp_processor_id();
int irq = K_INT_MBOX_0;
unsigned int action;
kstat_incr_irq_this_cpu(irq);
/* Load the mailbox register to figure out what we're supposed to do */
action = (____raw_readq(mailbox_regs[cpu]) >> 48) & 0xffff;
/* Clear the mailbox to clear the interrupt */
____raw_writeq(((u64)action) << 48, mailbox_clear_regs[cpu]);
if (action & SMP_RESCHEDULE_YOURSELF)
scheduler_ipi();
if (action & SMP_CALL_FUNCTION) {
irq_enter();
generic_smp_call_function_interrupt();
irq_exit();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 58 | 65.91% | 2 | 25.00% |
| Alex Smith | 9 | 10.23% | 1 | 12.50% |
| Peter Zijlstra | 9 | 10.23% | 1 | 12.50% |
| Mike Travis | 8 | 9.09% | 1 | 12.50% |
| Maciej W. Rozycki | 2 | 2.27% | 1 | 12.50% |
| Andrew Morton | 1 | 1.14% | 1 | 12.50% |
| Thomas Gleixner | 1 | 1.14% | 1 | 12.50% |
| Total | 88 | 100.00% | 8 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 413 | 76.77% | 5 | 29.41% |
| Andrew Morton | 77 | 14.31% | 2 | 11.76% |
| Rusty Russell | 11 | 2.04% | 2 | 11.76% |
| Peter Zijlstra | 11 | 2.04% | 1 | 5.88% |
| Alex Smith | 9 | 1.67% | 1 | 5.88% |
| Mike Travis | 8 | 1.49% | 1 | 5.88% |
| Paul Burton | 4 | 0.74% | 1 | 5.88% |
| Maciej W. Rozycki | 2 | 0.37% | 1 | 5.88% |
| Thomas Gleixner | 1 | 0.19% | 1 | 5.88% |
| Matt Redfearn | 1 | 0.19% | 1 | 5.88% |
| Ingo Molnar | 1 | 0.19% | 1 | 5.88% |
| Total | 538 | 100.00% | 17 | 100.00% |
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