diff options
| author |   Vasant Hegde <hegdevasant@linux.vnet.ibm.com> | 2014-08-09 11:15:45 +0530 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-08-13 15:13:45 +1000 |
| commit | b09c2ec4082c63584491f35df2cb530ee8ca312d (patch) | |
| tree | 05200fb46b8c6839065a64e148a9b01813f5de54 /arch/powerpc/platforms/powernv/opal.c | |
| parent | printk: Add function to return log buffer address and size (diff) | |
| download | linux-dev-b09c2ec4082c63584491f35df2cb530ee8ca312d.tar.xz linux-dev-b09c2ec4082c63584491f35df2cb530ee8ca312d.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index f0a01a46a57d..b44eec3e8dbd 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -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 */ |