470 lines
11 KiB
C
470 lines
11 KiB
C
/* leon_smp.c: Sparc-Leon SMP support.
|
|
*
|
|
* based on sun4m_smp.c
|
|
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
|
|
* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
|
|
* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
|
|
*/
|
|
|
|
#include <asm/head.h>
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/of.h>
|
|
#include <linux/init.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/profile.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/clockchips.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <linux/atomic.h>
|
|
#include <asm/irq_regs.h>
|
|
#include <asm/traps.h>
|
|
|
|
#include <asm/delay.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/oplib.h>
|
|
#include <asm/cpudata.h>
|
|
#include <asm/asi.h>
|
|
#include <asm/leon.h>
|
|
#include <asm/leon_amba.h>
|
|
#include <asm/timer.h>
|
|
|
|
#include "kernel.h"
|
|
|
|
#include "irq.h"
|
|
|
|
extern ctxd_t *srmmu_ctx_table_phys;
|
|
static int smp_processors_ready;
|
|
extern volatile unsigned long cpu_callin_map[NR_CPUS];
|
|
extern cpumask_t smp_commenced_mask;
|
|
void leon_configure_cache_smp(void);
|
|
static void leon_ipi_init(void);
|
|
|
|
/* IRQ number of LEON IPIs */
|
|
int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
|
|
|
|
static inline unsigned long do_swap(volatile unsigned long *ptr,
|
|
unsigned long val)
|
|
{
|
|
__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
|
|
: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
|
|
: "memory");
|
|
return val;
|
|
}
|
|
|
|
void leon_cpu_pre_starting(void *arg)
|
|
{
|
|
leon_configure_cache_smp();
|
|
}
|
|
|
|
void leon_cpu_pre_online(void *arg)
|
|
{
|
|
int cpuid = hard_smp_processor_id();
|
|
|
|
/* Allow master to continue. The master will then give us the
|
|
* go-ahead by setting the smp_commenced_mask and will wait without
|
|
* timeouts until our setup is completed fully (signified by
|
|
* our bit being set in the cpu_online_mask).
|
|
*/
|
|
do_swap(&cpu_callin_map[cpuid], 1);
|
|
|
|
local_ops->cache_all();
|
|
local_ops->tlb_all();
|
|
|
|
/* Fix idle thread fields. */
|
|
__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid])
|
|
: "memory" /* paranoid */);
|
|
|
|
/* Attach to the address space of init_task. */
|
|
atomic_inc(&init_mm.mm_count);
|
|
current->active_mm = &init_mm;
|
|
|
|
while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
|
|
mb();
|
|
}
|
|
|
|
/*
|
|
* Cycle through the processors asking the PROM to start each one.
|
|
*/
|
|
|
|
extern struct linux_prom_registers smp_penguin_ctable;
|
|
|
|
void leon_configure_cache_smp(void)
|
|
{
|
|
unsigned long cfg = sparc_leon3_get_dcachecfg();
|
|
int me = smp_processor_id();
|
|
|
|
if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
|
|
printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
|
|
(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
|
|
(unsigned int)cfg, (unsigned int)me);
|
|
sparc_leon3_disable_cache();
|
|
} else {
|
|
if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
|
|
sparc_leon3_enable_snooping();
|
|
} else {
|
|
printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
|
|
me);
|
|
sparc_leon3_disable_cache();
|
|
}
|
|
}
|
|
|
|
local_ops->cache_all();
|
|
local_ops->tlb_all();
|
|
}
|
|
|
|
static void leon_smp_setbroadcast(unsigned int mask)
|
|
{
|
|
int broadcast =
|
|
((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
|
|
LEON3_IRQMPSTATUS_BROADCAST) & 1);
|
|
if (!broadcast) {
|
|
prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
|
|
leon_smp_nrcpus());
|
|
if (leon_smp_nrcpus() > 1) {
|
|
BUG();
|
|
} else {
|
|
prom_printf("continue anyway\n");
|
|
return;
|
|
}
|
|
}
|
|
LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
|
|
}
|
|
|
|
int leon_smp_nrcpus(void)
|
|
{
|
|
int nrcpu =
|
|
((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
|
|
LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
|
|
return nrcpu;
|
|
}
|
|
|
|
void __init leon_boot_cpus(void)
|
|
{
|
|
int nrcpu = leon_smp_nrcpus();
|
|
int me = smp_processor_id();
|
|
|
|
/* Setup IPI */
|
|
leon_ipi_init();
|
|
|
|
printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
|
|
(unsigned int)nrcpu, (unsigned int)NR_CPUS,
|
|
(unsigned int)&(leon3_irqctrl_regs->mpstatus));
|
|
|
|
leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
|
|
leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
|
|
leon_enable_irq_cpu(leon_ipi_irq, me);
|
|
|
|
leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
|
|
|
|
leon_configure_cache_smp();
|
|
local_ops->cache_all();
|
|
|
|
}
|
|
|
|
int leon_boot_one_cpu(int i, struct task_struct *idle)
|
|
{
|
|
int timeout;
|
|
|
|
current_set[i] = task_thread_info(idle);
|
|
|
|
/* See trampoline.S:leon_smp_cpu_startup for details...
|
|
* Initialize the contexts table
|
|
* Since the call to prom_startcpu() trashes the structure,
|
|
* we need to re-initialize it for each cpu
|
|
*/
|
|
smp_penguin_ctable.which_io = 0;
|
|
smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
|
|
smp_penguin_ctable.reg_size = 0;
|
|
|
|
/* whirrr, whirrr, whirrrrrrrrr... */
|
|
printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
|
|
(unsigned int)&leon3_irqctrl_regs->mpstatus);
|
|
local_ops->cache_all();
|
|
|
|
/* Make sure all IRQs are of from the start for this new CPU */
|
|
LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
|
|
|
|
/* Wake one CPU */
|
|
LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
|
|
|
|
/* wheee... it's going... */
|
|
for (timeout = 0; timeout < 10000; timeout++) {
|
|
if (cpu_callin_map[i])
|
|
break;
|
|
udelay(200);
|
|
}
|
|
printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
|
|
|
|
if (!(cpu_callin_map[i])) {
|
|
printk(KERN_ERR "Processor %d is stuck.\n", i);
|
|
return -ENODEV;
|
|
} else {
|
|
leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
|
|
leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
|
|
leon_enable_irq_cpu(leon_ipi_irq, i);
|
|
}
|
|
|
|
local_ops->cache_all();
|
|
return 0;
|
|
}
|
|
|
|
void __init leon_smp_done(void)
|
|
{
|
|
|
|
int i, first;
|
|
int *prev;
|
|
|
|
/* setup cpu list for irq rotation */
|
|
first = 0;
|
|
prev = &first;
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
if (cpu_online(i)) {
|
|
*prev = i;
|
|
prev = &cpu_data(i).next;
|
|
}
|
|
}
|
|
*prev = first;
|
|
local_ops->cache_all();
|
|
|
|
/* Free unneeded trap tables */
|
|
if (!cpu_present(1)) {
|
|
free_reserved_page(virt_to_page(&trapbase_cpu1));
|
|
}
|
|
if (!cpu_present(2)) {
|
|
free_reserved_page(virt_to_page(&trapbase_cpu2));
|
|
}
|
|
if (!cpu_present(3)) {
|
|
free_reserved_page(virt_to_page(&trapbase_cpu3));
|
|
}
|
|
/* Ok, they are spinning and ready to go. */
|
|
smp_processors_ready = 1;
|
|
|
|
}
|
|
|
|
struct leon_ipi_work {
|
|
int single;
|
|
int msk;
|
|
int resched;
|
|
};
|
|
|
|
static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
|
|
|
|
/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
|
|
* is used for all three types of IPIs.
|
|
*/
|
|
static void __init leon_ipi_init(void)
|
|
{
|
|
int cpu, len;
|
|
struct leon_ipi_work *work;
|
|
struct property *pp;
|
|
struct device_node *rootnp;
|
|
struct tt_entry *trap_table;
|
|
unsigned long flags;
|
|
|
|
/* Find IPI IRQ or stick with default value */
|
|
rootnp = of_find_node_by_path("/ambapp0");
|
|
if (rootnp) {
|
|
pp = of_find_property(rootnp, "ipi_num", &len);
|
|
if (pp && (*(int *)pp->value))
|
|
leon_ipi_irq = *(int *)pp->value;
|
|
}
|
|
printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
|
|
|
|
/* Adjust so that we jump directly to smpleon_ipi */
|
|
local_irq_save(flags);
|
|
trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
|
|
trap_table->inst_three += smpleon_ipi - real_irq_entry;
|
|
local_ops->cache_all();
|
|
local_irq_restore(flags);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
work = &per_cpu(leon_ipi_work, cpu);
|
|
work->single = work->msk = work->resched = 0;
|
|
}
|
|
}
|
|
|
|
static void leon_send_ipi(int cpu, int level)
|
|
{
|
|
unsigned long mask;
|
|
mask = leon_get_irqmask(level);
|
|
LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
|
|
}
|
|
|
|
static void leon_ipi_single(int cpu)
|
|
{
|
|
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
/* Mark work */
|
|
work->single = 1;
|
|
|
|
/* Generate IRQ on the CPU */
|
|
leon_send_ipi(cpu, leon_ipi_irq);
|
|
}
|
|
|
|
static void leon_ipi_mask_one(int cpu)
|
|
{
|
|
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
/* Mark work */
|
|
work->msk = 1;
|
|
|
|
/* Generate IRQ on the CPU */
|
|
leon_send_ipi(cpu, leon_ipi_irq);
|
|
}
|
|
|
|
static void leon_ipi_resched(int cpu)
|
|
{
|
|
struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
|
|
|
|
/* Mark work */
|
|
work->resched = 1;
|
|
|
|
/* Generate IRQ on the CPU (any IRQ will cause resched) */
|
|
leon_send_ipi(cpu, leon_ipi_irq);
|
|
}
|
|
|
|
void leonsmp_ipi_interrupt(void)
|
|
{
|
|
struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work);
|
|
|
|
if (work->single) {
|
|
work->single = 0;
|
|
smp_call_function_single_interrupt();
|
|
}
|
|
if (work->msk) {
|
|
work->msk = 0;
|
|
smp_call_function_interrupt();
|
|
}
|
|
if (work->resched) {
|
|
work->resched = 0;
|
|
smp_resched_interrupt();
|
|
}
|
|
}
|
|
|
|
static struct smp_funcall {
|
|
smpfunc_t func;
|
|
unsigned long arg1;
|
|
unsigned long arg2;
|
|
unsigned long arg3;
|
|
unsigned long arg4;
|
|
unsigned long arg5;
|
|
unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
|
|
unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
|
|
} ccall_info __attribute__((aligned(8)));
|
|
|
|
static DEFINE_SPINLOCK(cross_call_lock);
|
|
|
|
/* Cross calls must be serialized, at least currently. */
|
|
static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
|
|
unsigned long arg2, unsigned long arg3,
|
|
unsigned long arg4)
|
|
{
|
|
if (smp_processors_ready) {
|
|
register int high = NR_CPUS - 1;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cross_call_lock, flags);
|
|
|
|
{
|
|
/* If you make changes here, make sure gcc generates proper code... */
|
|
register smpfunc_t f asm("i0") = func;
|
|
register unsigned long a1 asm("i1") = arg1;
|
|
register unsigned long a2 asm("i2") = arg2;
|
|
register unsigned long a3 asm("i3") = arg3;
|
|
register unsigned long a4 asm("i4") = arg4;
|
|
register unsigned long a5 asm("i5") = 0;
|
|
|
|
__asm__ __volatile__("std %0, [%6]\n\t"
|
|
"std %2, [%6 + 8]\n\t"
|
|
"std %4, [%6 + 16]\n\t" : :
|
|
"r"(f), "r"(a1), "r"(a2), "r"(a3),
|
|
"r"(a4), "r"(a5),
|
|
"r"(&ccall_info.func));
|
|
}
|
|
|
|
/* Init receive/complete mapping, plus fire the IPI's off. */
|
|
{
|
|
register int i;
|
|
|
|
cpumask_clear_cpu(smp_processor_id(), &mask);
|
|
cpumask_and(&mask, cpu_online_mask, &mask);
|
|
for (i = 0; i <= high; i++) {
|
|
if (cpumask_test_cpu(i, &mask)) {
|
|
ccall_info.processors_in[i] = 0;
|
|
ccall_info.processors_out[i] = 0;
|
|
leon_send_ipi(i, LEON3_IRQ_CROSS_CALL);
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
{
|
|
register int i;
|
|
|
|
i = 0;
|
|
do {
|
|
if (!cpumask_test_cpu(i, &mask))
|
|
continue;
|
|
|
|
while (!ccall_info.processors_in[i])
|
|
barrier();
|
|
} while (++i <= high);
|
|
|
|
i = 0;
|
|
do {
|
|
if (!cpumask_test_cpu(i, &mask))
|
|
continue;
|
|
|
|
while (!ccall_info.processors_out[i])
|
|
barrier();
|
|
} while (++i <= high);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&cross_call_lock, flags);
|
|
}
|
|
}
|
|
|
|
/* Running cross calls. */
|
|
void leon_cross_call_irq(void)
|
|
{
|
|
int i = smp_processor_id();
|
|
|
|
ccall_info.processors_in[i] = 1;
|
|
ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
|
|
ccall_info.arg4, ccall_info.arg5);
|
|
ccall_info.processors_out[i] = 1;
|
|
}
|
|
|
|
static const struct sparc32_ipi_ops leon_ipi_ops = {
|
|
.cross_call = leon_cross_call,
|
|
.resched = leon_ipi_resched,
|
|
.single = leon_ipi_single,
|
|
.mask_one = leon_ipi_mask_one,
|
|
};
|
|
|
|
void __init leon_init_smp(void)
|
|
{
|
|
/* Patch ipi15 trap table */
|
|
t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
|
|
|
|
sparc32_ipi_ops = &leon_ipi_ops;
|
|
}
|