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authorMichael Ellerman <michael@ellerman.id.au>2005-12-04 18:39:48 +1100
committerPaul Mackerras <paulus@samba.org>2006-01-09 14:52:31 +1100
commitdcee30361d25ea83499a99f921f9a56b4a1a79e7 (patch)
tree3ec01e42ba916047c370925e6d8ede1ae96293bf
parentcc53291521701f9c7c7265bbb3c140563174d8b2 (diff)
[PATCH] powerpc: Parse crashkernel= parameter in first kernel
This patch adds code to parse and setup the crash kernel resource in the first kernel. PPC64 ignores the @x part, we always run at 32 MB. Signed-off-by: Haren Myneni <haren@us.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/kernel/prom.c11
-rw-r--r--arch/powerpc/kernel/prom_init.c53
2 files changed, 64 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 9aac77ca3167..fddc9c13bff5 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -29,6 +29,7 @@
#include <linux/initrd.h>
#include <linux/bitops.h>
#include <linux/module.h>
+#include <linux/kexec.h>
#include <asm/prom.h>
#include <asm/rtas.h>
@@ -1198,6 +1199,16 @@ static int __init early_init_dt_scan_chosen(unsigned long node,
}
#endif /* CONFIG_PPC_RTAS */
+#ifdef CONFIG_KEXEC
+ lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
+ if (lprop)
+ crashk_res.start = *lprop;
+
+ lprop = (u64*)of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
+ if (lprop)
+ crashk_res.end = crashk_res.start + *lprop - 1;
+#endif
+
/* break now */
return 1;
}
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 369e1a6cdd40..2ae860c306d7 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -192,6 +192,11 @@ static unsigned long __initdata alloc_bottom;
static unsigned long __initdata rmo_top;
static unsigned long __initdata ram_top;
+#ifdef CONFIG_KEXEC
+static unsigned long __initdata prom_crashk_base;
+static unsigned long __initdata prom_crashk_size;
+#endif
+
static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
static int __initdata mem_reserve_cnt;
@@ -590,6 +595,34 @@ static void __init early_cmdline_parse(void)
RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
#endif
}
+
+#ifdef CONFIG_KEXEC
+ /*
+ * crashkernel=size@addr specifies the location to reserve for
+ * crash kernel.
+ */
+ opt = strstr(RELOC(prom_cmd_line), RELOC("crashkernel="));
+ if (opt) {
+ opt += 12;
+ RELOC(prom_crashk_size) = prom_memparse(opt, &opt);
+
+ if (ALIGN(RELOC(prom_crashk_size), 0x1000000) !=
+ RELOC(prom_crashk_size)) {
+ prom_printf("Warning: crashkernel size is not "
+ "aligned to 16MB\n");
+ }
+
+ /*
+ * At present, the crash kernel always run at 32MB.
+ * Just ignore whatever user passed.
+ */
+ RELOC(prom_crashk_base) = 0x2000000;
+ if (*opt == '@') {
+ prom_printf("Warning: PPC64 kdump kernel always runs "
+ "at 32 MB\n");
+ }
+ }
+#endif
}
#ifdef CONFIG_PPC_PSERIES
@@ -1011,6 +1044,12 @@ static void __init prom_init_mem(void)
prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
prom_printf(" ram_top : %x\n", RELOC(ram_top));
+#ifdef CONFIG_KEXEC
+ if (RELOC(prom_crashk_base)) {
+ prom_printf(" crashk_base : %x\n", RELOC(prom_crashk_base));
+ prom_printf(" crashk_size : %x\n", RELOC(prom_crashk_size));
+ }
+#endif
}
@@ -2094,6 +2133,10 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
*/
prom_init_mem();
+#ifdef CONFIG_KEXEC
+ if (RELOC(prom_crashk_base))
+ reserve_mem(RELOC(prom_crashk_base), RELOC(prom_crashk_size));
+#endif
/*
* Determine which cpu is actually running right _now_
*/
@@ -2150,6 +2193,16 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
}
#endif
+#ifdef CONFIG_KEXEC
+ if (RELOC(prom_crashk_base)) {
+ prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-base",
+ PTRRELOC(&prom_crashk_base),
+ sizeof(RELOC(prom_crashk_base)));
+ prom_setprop(_prom->chosen, "/chosen", "linux,crashkernel-size",
+ PTRRELOC(&prom_crashk_size),
+ sizeof(RELOC(prom_crashk_size)));
+ }
+#endif
/*
* Fixup any known bugs in the device-tree
*/