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powerpc/powernv: Interface to register/unregister opal dump region 

PowerNV platform is capable of capturing host memory region when system
crashes (because of host/firmware). We have new OPAL API to register/
unregister memory region to be captured when system crashes.

This patch adds support for new API. Also during boot time we register
kernel log buffer and unregister before doing kexec.

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 2014-08-09 11:15:45 +05:30 committed by Benjamin Herrenschmidt
parent 14c4000a88
commit b09c2ec408
3 changed files with 36 additions and 0 deletions
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11
arch/powerpc/include/asm/opal.h
View File

@ -149,6 +149,8 @@ struct opal_sg_list {
#define OPAL_DUMP_INFO2 94
#define OPAL_PCI_EEH_FREEZE_SET 97
#define OPAL_HANDLE_HMI 98
#define OPAL_REGISTER_DUMP_REGION 101
#define OPAL_UNREGISTER_DUMP_REGION 102
#ifndef __ASSEMBLY__
@ -920,6 +922,8 @@ int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer,
uint64_t length);
int64_t opal_sensor_read(uint32_t sensor_hndl, int token, __be32 *sensor_data);
int64_t opal_handle_hmi(void);
int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end);
int64_t opal_unregister_dump_region(uint32_t id);
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
@ -974,6 +978,13 @@ struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
unsigned long vmalloc_size);
void opal_free_sg_list(struct opal_sg_list *sg);
/*
* Dump region ID range usable by the OS
*/
#define OPAL_DUMP_REGION_HOST_START 0x80
#define OPAL_DUMP_REGION_LOG_BUF 0x80
#define OPAL_DUMP_REGION_HOST_END 0xFF
#endif /* __ASSEMBLY__ */
#endif /* __OPAL_H */

2
arch/powerpc/platforms/powernv/opal-wrappers.S
View File

@ -245,3 +245,5 @@ OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
OPAL_CALL(opal_handle_hmi, OPAL_HANDLE_HMI);
OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION);
OPAL_CALL(opal_unregister_dump_region, OPAL_UNREGISTER_DUMP_REGION);

23
arch/powerpc/platforms/powernv/opal.c
View File

@ -605,6 +605,24 @@ static int opal_sysfs_init(void)
return 0;
}
static void __init opal_dump_region_init(void)
{
void *addr;
uint64_t size;
int rc;
/* Register kernel log buffer */
addr = log_buf_addr_get();
size = log_buf_len_get();
rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
__pa(addr), size);
/* Don't warn if this is just an older OPAL that doesn't
* know about that call
*/
if (rc && rc != OPAL_UNSUPPORTED)
pr_warn("DUMP: Failed to register kernel log buffer. "
"rc = %d\n", rc);
}
static int __init opal_init(void)
{
struct device_node *np, *consoles;
@ -654,6 +672,8 @@ static int __init opal_init(void)
/* Create "opal" kobject under /sys/firmware */
rc = opal_sysfs_init();
if (rc == 0) {
/* Setup dump region interface */
opal_dump_region_init();
/* Setup error log interface */
rc = opal_elog_init();
/* Setup code update interface */
@ -694,6 +714,9 @@ void opal_shutdown(void)
else
mdelay(10);
}
/* Unregister memory dump region */
opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
}
/* Export this so that test modules can use it */