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Diffstat (limited to 'arch/powerpc/kernel/machine_kexec.c')
-rw-r--r--arch/powerpc/kernel/machine_kexec.c91
1 files changed, 79 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index ac2a21f45c75..b3abebb7ee64 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -13,13 +13,17 @@
#include <linux/reboot.h>
#include <linux/threads.h>
#include <linux/lmb.h>
+#include <linux/of.h>
#include <asm/machdep.h>
#include <asm/prom.h>
+#include <asm/sections.h>
void machine_crash_shutdown(struct pt_regs *regs)
{
if (ppc_md.machine_crash_shutdown)
ppc_md.machine_crash_shutdown(regs);
+ else
+ default_machine_crash_shutdown(regs);
}
/*
@@ -31,11 +35,8 @@ int machine_kexec_prepare(struct kimage *image)
{
if (ppc_md.machine_kexec_prepare)
return ppc_md.machine_kexec_prepare(image);
- /*
- * Fail if platform doesn't provide its own machine_kexec_prepare
- * implementation.
- */
- return -ENOSYS;
+ else
+ return default_machine_kexec_prepare(image);
}
void machine_kexec_cleanup(struct kimage *image)
@@ -52,13 +53,11 @@ void machine_kexec(struct kimage *image)
{
if (ppc_md.machine_kexec)
ppc_md.machine_kexec(image);
- else {
- /*
- * Fall back to normal restart if platform doesn't provide
- * its own kexec function, and user insist to kexec...
- */
- machine_restart(NULL);
- }
+ else
+ default_machine_kexec(image);
+
+ /* Fall back to normal restart if we're still alive. */
+ machine_restart(NULL);
for(;;);
}
@@ -118,3 +117,71 @@ int overlaps_crashkernel(unsigned long start, unsigned long size)
{
return (start + size) > crashk_res.start && start <= crashk_res.end;
}
+
+/* Values we need to export to the second kernel via the device tree. */
+static unsigned long kernel_end;
+static unsigned long crashk_size;
+
+static struct property kernel_end_prop = {
+ .name = "linux,kernel-end",
+ .length = sizeof(unsigned long),
+ .value = &kernel_end,
+};
+
+static struct property crashk_base_prop = {
+ .name = "linux,crashkernel-base",
+ .length = sizeof(unsigned long),
+ .value = &crashk_res.start,
+};
+
+static struct property crashk_size_prop = {
+ .name = "linux,crashkernel-size",
+ .length = sizeof(unsigned long),
+ .value = &crashk_size,
+};
+
+static void __init export_crashk_values(struct device_node *node)
+{
+ struct property *prop;
+
+ /* There might be existing crash kernel properties, but we can't
+ * be sure what's in them, so remove them. */
+ prop = of_find_property(node, "linux,crashkernel-base", NULL);
+ if (prop)
+ prom_remove_property(node, prop);
+
+ prop = of_find_property(node, "linux,crashkernel-size", NULL);
+ if (prop)
+ prom_remove_property(node, prop);
+
+ if (crashk_res.start != 0) {
+ prom_add_property(node, &crashk_base_prop);
+ crashk_size = crashk_res.end - crashk_res.start + 1;
+ prom_add_property(node, &crashk_size_prop);
+ }
+}
+
+static int __init kexec_setup(void)
+{
+ struct device_node *node;
+ struct property *prop;
+
+ node = of_find_node_by_path("/chosen");
+ if (!node)
+ return -ENOENT;
+
+ /* remove any stale properties so ours can be found */
+ prop = of_find_property(node, kernel_end_prop.name, NULL);
+ if (prop)
+ prom_remove_property(node, prop);
+
+ /* information needed by userspace when using default_machine_kexec */
+ kernel_end = __pa(_end);
+ prom_add_property(node, &kernel_end_prop);
+
+ export_crashk_values(node);
+
+ of_node_put(node);
+ return 0;
+}
+late_initcall(kexec_setup);