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powerpc/powernv: Call OPAL sync before kexec'ing

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Its possible that OPAL may be writing to host memory during
kexec (like dump retrieve scenario). In this situation we might
end up corrupting host memory.

This patch makes OPAL sync call to make sure OPAL stops
writing to host memory before kexec'ing.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vasant Hegde 2014-01-15 17:02:04 +11:00 committed by Benjamin Herrenschmidt
parent cb5b242c8c
commit f7d98d18a0
4 changed files with 23 additions and 2 deletions
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2
arch/powerpc/include/asm/opal.h
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@ -156,6 +156,7 @@ extern int opal_enter_rtas(struct rtas_args *args,
#define OPAL_FLASH_UPDATE 78
#define OPAL_GET_MSG 85
#define OPAL_CHECK_ASYNC_COMPLETION 86
#define OPAL_SYNC_HOST_REBOOT 87
#ifndef __ASSEMBLY__
@ -828,6 +829,7 @@ int64_t opal_update_flash(uint64_t blk_list);
int64_t opal_get_msg(uint64_t buffer, size_t size);
int64_t opal_check_completion(uint64_t buffer, size_t size, uint64_t token);
int64_t opal_sync_host_reboot(void);
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data);

1
arch/powerpc/platforms/powernv/opal-wrappers.S
View File

@ -128,3 +128,4 @@ OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE);
OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE);
OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);

16
arch/powerpc/platforms/powernv/opal.c
View File

@ -20,6 +20,7 @@
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/kobject.h>
#include <linux/delay.h>
#include <asm/opal.h>
#include <asm/firmware.h>
#include <asm/mce.h>
@ -482,10 +483,25 @@ subsys_initcall(opal_init);
void opal_shutdown(void)
{
unsigned int i;
long rc = OPAL_BUSY;
/* First free interrupts, which will also mask them */
for (i = 0; i < opal_irq_count; i++) {
if (opal_irqs[i])
free_irq(opal_irqs[i], NULL);
opal_irqs[i] = 0;
}
/*
* Then sync with OPAL which ensure anything that can
* potentially write to our memory has completed such
* as an ongoing dump retrieval
*/
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_sync_host_reboot();
if (rc == OPAL_BUSY)
opal_poll_events(NULL);
else
mdelay(10);
}
}

6
arch/powerpc/platforms/powernv/setup.c
View File

@ -145,8 +145,10 @@ static void pnv_shutdown(void)
/* Let the PCI code clear up IODA tables */
pnv_pci_shutdown();
/* And unregister all OPAL interrupts so they don't fire
* up while we kexec
/*
* Stop OPAL activity: Unregister all OPAL interrupts so they
* don't fire up while we kexec and make sure all potentially
* DMA'ing ops are complete (such as dump retrieval).
*/
opal_shutdown();
}