mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 16:07:11 +07:00
64fc2a947a
All low-level PM/SMP code using virt_to_phys() should actually use __pa_symbol() against kernel symbols. Update code where relevant to move away from virt_to_phys(). Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
/*
|
|
* arch/arm/mach-sti/platsmp.c
|
|
*
|
|
* Copyright (C) 2013 STMicroelectronics (R&D) Limited.
|
|
* http://www.st.com
|
|
*
|
|
* Cloned from linux/arch/arm/mach-vexpress/platsmp.c
|
|
*
|
|
* Copyright (C) 2002 ARM Ltd.
|
|
* All Rights Reserved
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
|
|
#include "smp.h"
|
|
|
|
static void write_pen_release(int val)
|
|
{
|
|
pen_release = val;
|
|
smp_wmb();
|
|
sync_cache_w(&pen_release);
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(boot_lock);
|
|
|
|
static void sti_secondary_init(unsigned int cpu)
|
|
{
|
|
/*
|
|
* let the primary processor know we're out of the
|
|
* pen, then head off into the C entry point
|
|
*/
|
|
write_pen_release(-1);
|
|
|
|
/*
|
|
* Synchronise with the boot thread.
|
|
*/
|
|
spin_lock(&boot_lock);
|
|
spin_unlock(&boot_lock);
|
|
}
|
|
|
|
static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
unsigned long timeout;
|
|
|
|
/*
|
|
* set synchronisation state between this boot processor
|
|
* and the secondary one
|
|
*/
|
|
spin_lock(&boot_lock);
|
|
|
|
/*
|
|
* The secondary processor is waiting to be released from
|
|
* the holding pen - release it, then wait for it to flag
|
|
* that it has been released by resetting pen_release.
|
|
*
|
|
* Note that "pen_release" is the hardware CPU ID, whereas
|
|
* "cpu" is Linux's internal ID.
|
|
*/
|
|
write_pen_release(cpu_logical_map(cpu));
|
|
|
|
/*
|
|
* Send the secondary CPU a soft interrupt, thereby causing
|
|
* it to jump to the secondary entrypoint.
|
|
*/
|
|
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
|
|
|
|
timeout = jiffies + (1 * HZ);
|
|
while (time_before(jiffies, timeout)) {
|
|
smp_rmb();
|
|
if (pen_release == -1)
|
|
break;
|
|
|
|
udelay(10);
|
|
}
|
|
|
|
/*
|
|
* now the secondary core is starting up let it run its
|
|
* calibrations, then wait for it to finish
|
|
*/
|
|
spin_unlock(&boot_lock);
|
|
|
|
return pen_release != -1 ? -ENOSYS : 0;
|
|
}
|
|
|
|
static void __init sti_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
struct device_node *np;
|
|
void __iomem *scu_base;
|
|
u32 __iomem *cpu_strt_ptr;
|
|
u32 release_phys;
|
|
int cpu;
|
|
unsigned long entry_pa = __pa_symbol(sti_secondary_startup);
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
|
|
|
|
if (np) {
|
|
scu_base = of_iomap(np, 0);
|
|
scu_enable(scu_base);
|
|
of_node_put(np);
|
|
}
|
|
|
|
if (max_cpus <= 1)
|
|
return;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
|
|
np = of_get_cpu_node(cpu, NULL);
|
|
|
|
if (!np)
|
|
continue;
|
|
|
|
if (of_property_read_u32(np, "cpu-release-addr",
|
|
&release_phys)) {
|
|
pr_err("CPU %d: missing or invalid cpu-release-addr "
|
|
"property\n", cpu);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* holding pen is usually configured in SBC DMEM but can also be
|
|
* in RAM.
|
|
*/
|
|
|
|
if (!memblock_is_memory(release_phys))
|
|
cpu_strt_ptr =
|
|
ioremap(release_phys, sizeof(release_phys));
|
|
else
|
|
cpu_strt_ptr =
|
|
(u32 __iomem *)phys_to_virt(release_phys);
|
|
|
|
__raw_writel(entry_pa, cpu_strt_ptr);
|
|
|
|
/*
|
|
* wmb so that data is actually written
|
|
* before cache flush is done
|
|
*/
|
|
smp_wmb();
|
|
sync_cache_w(cpu_strt_ptr);
|
|
|
|
if (!memblock_is_memory(release_phys))
|
|
iounmap(cpu_strt_ptr);
|
|
}
|
|
}
|
|
|
|
const struct smp_operations sti_smp_ops __initconst = {
|
|
.smp_prepare_cpus = sti_smp_prepare_cpus,
|
|
.smp_secondary_init = sti_secondary_init,
|
|
.smp_boot_secondary = sti_boot_secondary,
|
|
};
|