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authorMichael Holzheu <holzheu@de.ibm.com>2007-04-27 16:01:49 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-04-27 16:01:44 +0200
commit411ed3225733dbd83b4cbaaa992ef80d6ec1534e (patch)
tree388aeac39e9fad5f7cadcc8fcbf0838811f5829d /arch/s390/kernel/setup.c
parent7039d3a11c4b4b59f9ef933b4b0a28304bdd07d1 (diff)
[S390] zfcpdump support.
s390 machines provide hardware support for creating Linux dumps on SCSI disks. For creating a dump a special purpose dump Linux is used. The first 32 MB of memory are saved by the hardware before the dump Linux is booted. Via an SCLP interface, the saved memory can be accessed from Linux. This patch exports memory and registers of the crashed Linux to userspace via a debugfs file. For more information refer to Documentation/s390/zfcpdump.txt, which is included in this patch. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/setup.c')
-rw-r--r--arch/s390/kernel/setup.c38
1 files changed, 35 insertions, 3 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 863c8d08c02..3dfd0985861 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -285,6 +285,26 @@ static void __init conmode_default(void)
}
}
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
+static void __init setup_zfcpdump(unsigned int console_devno)
+{
+ static char str[64];
+
+ if (ipl_info.type != IPL_TYPE_FCP_DUMP)
+ return;
+ if (console_devno != -1)
+ sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
+ ipl_info.data.fcp.dev_id.devno, console_devno);
+ else
+ sprintf(str, "cio_ignore=all,!0.0.%04x",
+ ipl_info.data.fcp.dev_id.devno);
+ strcat(COMMAND_LINE, str);
+ console_loglevel = 2;
+}
+#else
+static inline void setup_zfcpdump(unsigned int console_devno) {}
+#endif /* CONFIG_ZFCPDUMP */
+
#ifdef CONFIG_SMP
void (*_machine_restart)(char *command) = machine_restart_smp;
void (*_machine_halt)(void) = machine_halt_smp;
@@ -586,13 +606,20 @@ setup_resources(void)
}
}
+unsigned long real_memory_size;
+EXPORT_SYMBOL_GPL(real_memory_size);
+
static void __init setup_memory_end(void)
{
- unsigned long real_size, memory_size;
+ unsigned long memory_size;
unsigned long max_mem, max_phys;
int i;
- memory_size = real_size = 0;
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
+ if (ipl_info.type == IPL_TYPE_FCP_DUMP)
+ memory_end = ZFCPDUMP_HSA_SIZE;
+#endif
+ memory_size = 0;
max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
memory_end &= PAGE_MASK;
@@ -601,7 +628,8 @@ static void __init setup_memory_end(void)
for (i = 0; i < MEMORY_CHUNKS; i++) {
struct mem_chunk *chunk = &memory_chunk[i];
- real_size = max(real_size, chunk->addr + chunk->size);
+ real_memory_size = max(real_memory_size,
+ chunk->addr + chunk->size);
if (chunk->addr >= max_mem) {
memset(chunk, 0, sizeof(*chunk));
continue;
@@ -765,6 +793,7 @@ setup_arch(char **cmdline_p)
parse_early_param();
+ setup_ipl_info();
setup_memory_end();
setup_addressing_mode();
setup_memory();
@@ -782,6 +811,9 @@ setup_arch(char **cmdline_p)
/* Setup default console */
conmode_default();
+
+ /* Setup zfcpdump support */
+ setup_zfcpdump(console_devno);
}
void print_cpu_info(struct cpuinfo_S390 *cpuinfo)