powerpc: Disable relocation on exceptions when kexecing

Since we don't know if they new kernel we are kexecing into has been
built to support relocation on exceptions, we disable them before we
kexec.

We do NOT disable them if we are execing a kdump kernel, because we
want to change as little state as possible and it is likely that we are
execing ourselves and will be able to handle them anyway.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Ian Munsie 2012-11-08 16:40:28 +11:00 коммит произвёл Benjamin Herrenschmidt
Родитель fc8effa4e4
Коммит cedddd812a
1 изменённых файлов: 33 добавлений и 0 удалений

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@ -41,6 +41,7 @@
#include <linux/root_dev.h>
#include <linux/cpuidle.h>
#include <linux/of.h>
#include <linux/kexec.h>
#include <asm/mmu.h>
#include <asm/processor.h>
@ -397,6 +398,35 @@ static int __init pSeries_enable_reloc_on_exc(void)
}
}
#ifdef CONFIG_KEXEC
static long pSeries_disable_reloc_on_exc(void)
{
long rc;
while (1) {
rc = disable_reloc_on_exceptions();
if (!H_IS_LONG_BUSY(rc))
return rc;
mdelay(get_longbusy_msecs(rc));
}
}
static void pSeries_machine_kexec(struct kimage *image)
{
long rc;
if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
(image->type != KEXEC_TYPE_CRASH)) {
rc = pSeries_disable_reloc_on_exc();
if (rc != H_SUCCESS)
pr_warning("Warning: Failed to disable relocation on "
"exceptions: %ld\n", rc);
}
default_machine_kexec(image);
}
#endif
static void __init pSeries_setup_arch(void)
{
panic_timeout = 10;
@ -697,4 +727,7 @@ define_machine(pseries) {
.progress = rtas_progress,
.system_reset_exception = pSeries_system_reset_exception,
.machine_check_exception = pSeries_machine_check_exception,
#ifdef CONFIG_KEXEC
.machine_kexec = pSeries_machine_kexec,
#endif
};