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powerpc/85xx: kexec for SMP 85xx BookE systems

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Adds support for kexec on 85xx machines for the BookE platform.
Including support for SMP machines

Based off work from Maxim Uvarov <muvarov@mvista.com>
Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Matthew McClintock 2010-07-21 16:14:53 -05:00 committed by Kumar Gala
parent e8e5c2155b
commit f933a41e41
2 changed files with 68 additions and 5 deletions
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10
arch/powerpc/Kconfig
View File

@ -352,7 +352,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
depends on (PPC_BOOK3S || (FSL_BOOKE && !SMP)) && EXPERIMENTAL
depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
@ -369,8 +369,8 @@ config KEXEC
config CRASH_DUMP
bool "Build a kdump crash kernel"
depends on PPC64 || 6xx
select RELOCATABLE if PPC64
depends on PPC64 || 6xx || FSL_BOOKE
select RELOCATABLE if PPC64 || FSL_BOOKE
help
Build a kernel suitable for use as a kdump capture kernel.
The same kernel binary can be used as production kernel and dump
@ -898,7 +898,7 @@ config KERNEL_START_BOOL
config KERNEL_START
hex "Virtual address of kernel base" if KERNEL_START_BOOL
default PAGE_OFFSET if PAGE_OFFSET_BOOL
default "0xc2000000" if CRASH_DUMP
default "0xc2000000" if CRASH_DUMP && !RELOCATABLE
default "0xc0000000"
config PHYSICAL_START_BOOL
@ -911,7 +911,7 @@ config PHYSICAL_START_BOOL
config PHYSICAL_START
hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE
default "0x00000000"
config PHYSICAL_ALIGN

63
arch/powerpc/platforms/85xx/smp.c
View File

@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/kexec.h>
#include <asm/machdep.h>
#include <asm/pgtable.h>
@ -24,6 +25,7 @@
#include <asm/dbell.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/mpic.h>
extern void __early_start(void);
@ -105,8 +107,64 @@ smp_85xx_setup_cpu(int cpu_nr)
struct smp_ops_t smp_85xx_ops = {
.kick_cpu = smp_85xx_kick_cpu,
#ifdef CONFIG_KEXEC
.give_timebase = smp_generic_give_timebase,
.take_timebase = smp_generic_take_timebase,
#endif
};
#ifdef CONFIG_KEXEC
static int kexec_down_cpus = 0;
void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
{
mpic_teardown_this_cpu(1);
/* When crashing, this gets called on all CPU's we only
* take down the non-boot cpus */
if (smp_processor_id() != boot_cpuid)
{
local_irq_disable();
kexec_down_cpus++;
while (1);
}
}
static void mpc85xx_smp_kexec_down(void *arg)
{
if (ppc_md.kexec_cpu_down)
ppc_md.kexec_cpu_down(0,1);
}
static void mpc85xx_smp_machine_kexec(struct kimage *image)
{
int timeout = 2000;
int i;
set_cpus_allowed(current, cpumask_of_cpu(boot_cpuid));
smp_call_function(mpc85xx_smp_kexec_down, NULL, 0);
while ( (kexec_down_cpus != (num_online_cpus() - 1)) &&
( timeout > 0 ) )
{
timeout--;
}
if ( !timeout )
printk(KERN_ERR "Unable to bring down secondary cpu(s)");
for (i = 0; i < num_present_cpus(); i++)
{
if ( i == smp_processor_id() ) continue;
mpic_reset_core(i);
}
default_machine_kexec(image);
}
#endif /* CONFIG_KEXEC */
void __init mpc85xx_smp_init(void)
{
struct device_node *np;
@ -124,4 +182,9 @@ void __init mpc85xx_smp_init(void)
BUG_ON(!smp_85xx_ops.message_pass);
smp_ops = &smp_85xx_ops;
#ifdef CONFIG_KEXEC
ppc_md.kexec_cpu_down = mpc85xx_smp_kexec_cpu_down;
ppc_md.machine_kexec = mpc85xx_smp_machine_kexec;
#endif
}