mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 01:50:53 +07:00
9b6695a8ad
A recent change requires cpu_possible_map to be initialized before
smp_sched_init() but most MIPS platforms were initializing their
processors in the prom_prepare_cpus callback of smp_prepare_cpus. The
simple fix of calling prom_prepare_cpus from one of the earlier SMP
initialization hooks doesn't work well either since IPIs may require
init_IRQ() to have completed, so bit the bullet and split
prom_prepare_cpus into two initialization functions, plat_smp_setup
which is called early from setup_arch and plat_prepare_cpus called where
prom_prepare_cpus used to be called.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
343 lines
8.3 KiB
C
343 lines
8.3 KiB
C
/*
|
|
* Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved.
|
|
*
|
|
* Elizabeth Clarke (beth@mips.com)
|
|
*
|
|
* This program is free software; you can distribute it and/or modify it
|
|
* under the terms of the GNU General Public License (Version 2) as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/compiler.h>
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/system.h>
|
|
#include <asm/hardirq.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/time.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/mipsmtregs.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/mips-boards/maltaint.h>
|
|
|
|
#define MIPS_CPU_IPI_RESCHED_IRQ 0
|
|
#define MIPS_CPU_IPI_CALL_IRQ 1
|
|
|
|
static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
|
|
|
|
#if 0
|
|
static void dump_mtregisters(int vpe, int tc)
|
|
{
|
|
printk("vpe %d tc %d\n", vpe, tc);
|
|
|
|
settc(tc);
|
|
|
|
printk(" c0 status 0x%lx\n", read_vpe_c0_status());
|
|
printk(" vpecontrol 0x%lx\n", read_vpe_c0_vpecontrol());
|
|
printk(" vpeconf0 0x%lx\n", read_vpe_c0_vpeconf0());
|
|
printk(" tcstatus 0x%lx\n", read_tc_c0_tcstatus());
|
|
printk(" tcrestart 0x%lx\n", read_tc_c0_tcrestart());
|
|
printk(" tcbind 0x%lx\n", read_tc_c0_tcbind());
|
|
printk(" tchalt 0x%lx\n", read_tc_c0_tchalt());
|
|
}
|
|
#endif
|
|
|
|
void __init sanitize_tlb_entries(void)
|
|
{
|
|
int i, tlbsiz;
|
|
unsigned long mvpconf0, ncpu;
|
|
|
|
if (!cpu_has_mipsmt)
|
|
return;
|
|
|
|
set_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
|
|
back_to_back_c0_hazard();
|
|
|
|
/* Disable TLB sharing */
|
|
clear_c0_mvpcontrol(MVPCONTROL_STLB);
|
|
|
|
mvpconf0 = read_c0_mvpconf0();
|
|
|
|
printk(KERN_INFO "MVPConf0 0x%lx TLBS %lx PTLBE %ld\n", mvpconf0,
|
|
(mvpconf0 & MVPCONF0_TLBS) >> MVPCONF0_TLBS_SHIFT,
|
|
(mvpconf0 & MVPCONF0_PTLBE) >> MVPCONF0_PTLBE_SHIFT);
|
|
|
|
tlbsiz = (mvpconf0 & MVPCONF0_PTLBE) >> MVPCONF0_PTLBE_SHIFT;
|
|
ncpu = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
|
|
|
|
printk(" tlbsiz %d ncpu %ld\n", tlbsiz, ncpu);
|
|
|
|
if (tlbsiz > 0) {
|
|
/* share them out across the vpe's */
|
|
tlbsiz /= ncpu;
|
|
|
|
printk(KERN_INFO "setting Config1.MMU_size to %d\n", tlbsiz);
|
|
|
|
for (i = 0; i < ncpu; i++) {
|
|
settc(i);
|
|
|
|
if (i == 0)
|
|
write_c0_config1((read_c0_config1() & ~(0x3f << 25)) | (tlbsiz << 25));
|
|
else
|
|
write_vpe_c0_config1((read_vpe_c0_config1() & ~(0x3f << 25)) |
|
|
(tlbsiz << 25));
|
|
}
|
|
}
|
|
|
|
clear_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
}
|
|
|
|
static void ipi_resched_dispatch (struct pt_regs *regs)
|
|
{
|
|
do_IRQ(MIPS_CPU_IPI_RESCHED_IRQ, regs);
|
|
}
|
|
|
|
static void ipi_call_dispatch (struct pt_regs *regs)
|
|
{
|
|
do_IRQ(MIPS_CPU_IPI_CALL_IRQ, regs);
|
|
}
|
|
|
|
irqreturn_t ipi_resched_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
irqreturn_t ipi_call_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
smp_call_function_interrupt();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction irq_resched = {
|
|
.handler = ipi_resched_interrupt,
|
|
.flags = SA_INTERRUPT,
|
|
.name = "IPI_resched"
|
|
};
|
|
|
|
static struct irqaction irq_call = {
|
|
.handler = ipi_call_interrupt,
|
|
.flags = SA_INTERRUPT,
|
|
.name = "IPI_call"
|
|
};
|
|
|
|
/*
|
|
* Common setup before any secondaries are started
|
|
* Make sure all CPU's are in a sensible state before we boot any of the
|
|
* secondarys
|
|
*/
|
|
void plat_smp_setup(void)
|
|
{
|
|
unsigned long val;
|
|
int i, num;
|
|
|
|
if (!cpu_has_mipsmt)
|
|
return;
|
|
|
|
/* disable MT so we can configure */
|
|
dvpe();
|
|
dmt();
|
|
|
|
/* Put MVPE's into 'configuration state' */
|
|
set_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
|
|
val = read_c0_mvpconf0();
|
|
|
|
/* we'll always have more TC's than VPE's, so loop setting everything
|
|
to a sensible state */
|
|
for (i = 0, num = 0; i <= ((val & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT); i++) {
|
|
settc(i);
|
|
|
|
/* VPE's */
|
|
if (i <= ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)) {
|
|
|
|
/* deactivate all but vpe0 */
|
|
if (i != 0) {
|
|
unsigned long tmp = read_vpe_c0_vpeconf0();
|
|
|
|
tmp &= ~VPECONF0_VPA;
|
|
|
|
/* master VPE */
|
|
tmp |= VPECONF0_MVP;
|
|
write_vpe_c0_vpeconf0(tmp);
|
|
|
|
/* Record this as available CPU */
|
|
cpu_set(i, phys_cpu_present_map);
|
|
__cpu_number_map[i] = ++num;
|
|
__cpu_logical_map[num] = i;
|
|
}
|
|
|
|
/* disable multi-threading with TC's */
|
|
write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
|
|
|
|
if (i != 0) {
|
|
write_vpe_c0_status((read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
|
|
write_vpe_c0_cause(read_vpe_c0_cause() & ~CAUSEF_IP);
|
|
|
|
/* set config to be the same as vpe0, particularly kseg0 coherency alg */
|
|
write_vpe_c0_config( read_c0_config());
|
|
|
|
/* Propagate Config7 */
|
|
write_vpe_c0_config7(read_c0_config7());
|
|
}
|
|
|
|
}
|
|
|
|
/* TC's */
|
|
|
|
if (i != 0) {
|
|
unsigned long tmp;
|
|
|
|
/* bind a TC to each VPE, May as well put all excess TC's
|
|
on the last VPE */
|
|
if ( i >= (((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1) )
|
|
write_tc_c0_tcbind(read_tc_c0_tcbind() | ((val & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) );
|
|
else {
|
|
write_tc_c0_tcbind( read_tc_c0_tcbind() | i);
|
|
|
|
/* and set XTC */
|
|
write_vpe_c0_vpeconf0( read_vpe_c0_vpeconf0() | (i << VPECONF0_XTC_SHIFT));
|
|
}
|
|
|
|
tmp = read_tc_c0_tcstatus();
|
|
|
|
/* mark not allocated and not dynamically allocatable */
|
|
tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
|
|
tmp |= TCSTATUS_IXMT; /* interrupt exempt */
|
|
write_tc_c0_tcstatus(tmp);
|
|
|
|
write_tc_c0_tchalt(TCHALT_H);
|
|
}
|
|
}
|
|
|
|
/* Release config state */
|
|
clear_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
|
|
/* We'll wait until starting the secondaries before starting MVPE */
|
|
|
|
printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
|
|
|
|
/* set up ipi interrupts */
|
|
if (cpu_has_vint) {
|
|
set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
|
|
set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
|
|
}
|
|
}
|
|
|
|
void __init plat_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
cpu_ipi_resched_irq = MIPSCPU_INT_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
|
|
cpu_ipi_call_irq = MIPSCPU_INT_BASE + MIPS_CPU_IPI_CALL_IRQ;
|
|
|
|
setup_irq(cpu_ipi_resched_irq, &irq_resched);
|
|
setup_irq(cpu_ipi_call_irq, &irq_call);
|
|
|
|
/* need to mark IPI's as IRQ_PER_CPU */
|
|
irq_desc[cpu_ipi_resched_irq].status |= IRQ_PER_CPU;
|
|
irq_desc[cpu_ipi_call_irq].status |= IRQ_PER_CPU;
|
|
}
|
|
|
|
/*
|
|
* Setup the PC, SP, and GP of a secondary processor and start it
|
|
* running!
|
|
* smp_bootstrap is the place to resume from
|
|
* __KSTK_TOS(idle) is apparently the stack pointer
|
|
* (unsigned long)idle->thread_info the gp
|
|
* assumes a 1:1 mapping of TC => VPE
|
|
*/
|
|
void prom_boot_secondary(int cpu, struct task_struct *idle)
|
|
{
|
|
struct thread_info *gp = task_thread_info(idle);
|
|
dvpe();
|
|
set_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
|
|
settc(cpu);
|
|
|
|
/* restart */
|
|
write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
|
|
|
|
/* enable the tc this vpe/cpu will be running */
|
|
write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
|
|
|
|
write_tc_c0_tchalt(0);
|
|
|
|
/* enable the VPE */
|
|
write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
|
|
|
|
/* stack pointer */
|
|
write_tc_gpr_sp( __KSTK_TOS(idle));
|
|
|
|
/* global pointer */
|
|
write_tc_gpr_gp((unsigned long)gp);
|
|
|
|
flush_icache_range((unsigned long)gp, (unsigned long)(gp + 1));
|
|
|
|
/* finally out of configuration and into chaos */
|
|
clear_c0_mvpcontrol(MVPCONTROL_VPC);
|
|
|
|
evpe(EVPE_ENABLE);
|
|
}
|
|
|
|
void prom_init_secondary(void)
|
|
{
|
|
write_c0_status((read_c0_status() & ~ST0_IM ) |
|
|
(STATUSF_IP0 | STATUSF_IP1 | STATUSF_IP7));
|
|
}
|
|
|
|
void prom_smp_finish(void)
|
|
{
|
|
write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
|
|
|
|
local_irq_enable();
|
|
}
|
|
|
|
void prom_cpus_done(void)
|
|
{
|
|
}
|
|
|
|
void core_send_ipi(int cpu, unsigned int action)
|
|
{
|
|
int i;
|
|
unsigned long flags;
|
|
int vpflags;
|
|
|
|
local_irq_save (flags);
|
|
|
|
vpflags = dvpe(); /* cant access the other CPU's registers whilst MVPE enabled */
|
|
|
|
switch (action) {
|
|
case SMP_CALL_FUNCTION:
|
|
i = C_SW1;
|
|
break;
|
|
|
|
case SMP_RESCHEDULE_YOURSELF:
|
|
default:
|
|
i = C_SW0;
|
|
break;
|
|
}
|
|
|
|
/* 1:1 mapping of vpe and tc... */
|
|
settc(cpu);
|
|
write_vpe_c0_cause(read_vpe_c0_cause() | i);
|
|
evpe(vpflags);
|
|
|
|
local_irq_restore(flags);
|
|
}
|