Merge branch 'for_paulus' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc

[sfrench/cifs-2.6.git] / arch / powerpc / kernel / machine_kexec_64.c

diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index ee166c586642c7a61a0a727be0632d9e08b34412..b438d45a068c6b0dd621b0f51520f9478b729539 100644 (file)
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -21,6 +21,7 @@
 #include <asm/machdep.h>
 #include <asm/cacheflush.h>
 #include <asm/paca.h>
+#include <asm/lmb.h>
 #include <asm/mmu.h>
 #include <asm/sections.h>      /* _end */
 #include <asm/prom.h>
@@ -335,7 +336,107 @@ static void __init export_htab_values(void)
        of_node_put(node);
 }
 
-void __init kexec_setup(void)
+static struct property crashk_base_prop = {
+       .name = "linux,crashkernel-base",
+       .length = sizeof(unsigned long),
+       .value = (unsigned char *)&crashk_res.start,
+};
+
+static unsigned long crashk_size;
+
+static struct property crashk_size_prop = {
+       .name = "linux,crashkernel-size",
+       .length = sizeof(unsigned long),
+       .value = (unsigned char *)&crashk_size,
+};
+
+static void __init export_crashk_values(void)
+{
+       struct device_node *node;
+       struct property *prop;
+
+       node = of_find_node_by_path("/chosen");
+       if (!node)
+               return;
+
+       /* 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);
+       }
+
+       of_node_put(node);
+}
+
+static int __init kexec_setup(void)
 {
        export_htab_values();
+       export_crashk_values();
+       return 0;
+}
+__initcall(kexec_setup);
+
+static int __init early_parse_crashk(char *p)
+{
+       unsigned long size;
+
+       if (!p)
+               return 1;
+
+       size = memparse(p, &p);
+
+       if (*p == '@')
+               crashk_res.start = memparse(p + 1, &p);
+       else
+               crashk_res.start = KDUMP_KERNELBASE;
+
+       crashk_res.end = crashk_res.start + size - 1;
+
+       return 0;
+}
+early_param("crashkernel", early_parse_crashk);
+
+void __init reserve_crashkernel(void)
+{
+       unsigned long size;
+
+       if (crashk_res.start == 0)
+               return;
+
+       /* We might have got these values via the command line or the
+        * device tree, either way sanitise them now. */
+
+       size = crashk_res.end - crashk_res.start + 1;
+
+       if (crashk_res.start != KDUMP_KERNELBASE)
+               printk("Crash kernel location must be 0x%x\n",
+                               KDUMP_KERNELBASE);
+
+       crashk_res.start = KDUMP_KERNELBASE;
+       size = PAGE_ALIGN(size);
+       crashk_res.end = crashk_res.start + size - 1;
+
+       /* Crash kernel trumps memory limit */
+       if (memory_limit && memory_limit <= crashk_res.end) {
+               memory_limit = crashk_res.end + 1;
+               printk("Adjusted memory limit for crashkernel, now 0x%lx\n",
+                               memory_limit);
+       }
+
+       lmb_reserve(crashk_res.start, size);
+}
+
+int overlaps_crashkernel(unsigned long start, unsigned long size)
+{
+       return (start + size) > crashk_res.start && start <= crashk_res.end;
 }