sh: kdump support.

This adds support for kexec based crash dumps.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

5 files changed, 92 insertions, 4 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 0b465d622cfc..dfdfaae6772f 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -551,6 +551,20 @@ config KEXEC
           support.  As of this writing the exact hardware interface is
           strongly in flux, so no good recommendation can be made.
 
+config CRASH_DUMP
+        bool "kernel crash dumps (EXPERIMENTAL)"
+        depends on EXPERIMENTAL
+        help
+          Generate crash dump after being started by kexec.
+          This should be normally only set in special crash dump kernels
+          which are loaded in the main kernel with kexec-tools into
+          a specially reserved region and then later executed after
+          a crash by kdump/kexec. The crash dump kernel must be compiled
+          to a memory address not used by the main kernel using
+          MEMORY_START.
+
+          For more details see Documentation/kdump/kdump.txt
+
 config SMP
         bool "Symmetric multi-processing support"
         ---help---
diff --git a/arch/sh/kernel/Makefile b/arch/sh/kernel/Makefile
index ff30d7f58043..9104b6257644 100644
--- a/arch/sh/kernel/Makefile
+++ b/arch/sh/kernel/Makefile
@@ -20,5 +20,6 @@ obj-$(CONFIG_SH_CPU_FREQ)	+= cpufreq.o
 obj-$(CONFIG_MODULES)           += module.o
 obj-$(CONFIG_EARLY_PRINTK)      += early_printk.o
 obj-$(CONFIG_KEXEC)             += machine_kexec.o relocate_kernel.o
+obj-$(CONFIG_CRASH_DUMP)        += crash_dump.o
 obj-$(CONFIG_PM)                += pm.o
 obj-$(CONFIG_STACKTRACE)        += stacktrace.o
diff --git a/arch/sh/kernel/crash_dump.c b/arch/sh/kernel/crash_dump.c
new file mode 100644
index 000000000000..4a2ecbe27d8e
--- /dev/null
+++ b/arch/sh/kernel/crash_dump.c
@@ -0,0 +1,46 @@
+/*
+ *      crash_dump.c - Memory preserving reboot related code.
+ *
+ *      Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
+ *      Copyright (C) IBM Corporation, 2004. All rights reserved
+ */
+
+#include <linux/errno.h>
+#include <linux/crash_dump.h>
+#include <linux/io.h>
+#include <asm/uaccess.h>
+
+/**
+ * copy_oldmem_page - copy one page from "oldmem"
+ * @pfn: page frame number to be copied
+ * @buf: target memory address for the copy; this can be in kernel address
+ *      space or user address space (see @userbuf)
+ * @csize: number of bytes to copy
+ * @offset: offset in bytes into the page (based on pfn) to begin the copy
+ * @userbuf: if set, @buf is in user address space, use copy_to_user(),
+ *      otherwise @buf is in kernel address space, use memcpy().
+ *
+ * Copy a page from "oldmem". For this page, there is no pte mapped
+ * in the current kernel. We stitch up a pte, similar to kmap_atomic.
+ */
+ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
+                               size_t csize, unsigned long offset, int userbuf)
+{
+        void  *vaddr;
+
+        if (!csize)
+                return 0;
+
+        vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+
+        if (userbuf) {
+                if (copy_to_user(buf, (vaddr + offset), csize)) {
+                        iounmap(vaddr);
+                        return -EFAULT;
+                }
+        } else
+        memcpy(buf, (vaddr + offset), csize);
+
+        iounmap(vaddr);
+        return csize;
+}
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 08587cdb64d6..790ed69b8666 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -59,13 +59,13 @@ static void kexec_info(struct kimage *image)
                 printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
                        i,
                        (unsigned int)image->segment[i].mem,
-                       (unsigned int)image->segment[i].mem + image->segment[i].memsz,
+                       (unsigned int)image->segment[i].mem +
+                                     image->segment[i].memsz,
                        (unsigned int)image->segment[i].memsz);
-        }
+        }
         printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
 }
 
-
 /*
  * Do not allocate memory (or fail in any way) in machine_kexec().
  * We are past the point of no return, committed to rebooting now.
@@ -101,6 +101,27 @@ NORET_TYPE void machine_kexec(struct kimage *image)
 
         /* now call it */
         rnk = (relocate_new_kernel_t) reboot_code_buffer;
-        (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
+        (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
 }
 
+/* crashkernel=size@addr specifies the location to reserve for
+ * a crash kernel.  By reserving this memory we guarantee
+ * that linux never sets it up as a DMA target.
+ * Useful for holding code to do something appropriate
+ * after a kernel panic.
+ */
+static int __init parse_crashkernel(char *arg)
+{
+        unsigned long size, base;
+        size = memparse(arg, &arg);
+        if (*arg == '@') {
+                base = memparse(arg+1, &arg);
+                /* FIXME: Do I want a sanity check
+                 * to validate the memory range?
+                 */
+                crashk_res.start = base;
+                crashk_res.end   = base + size - 1;
+        }
+        return 0;
+}
+early_param("crashkernel", parse_crashkernel);
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index cab91a7665da..477d2a854fc4 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -20,6 +20,7 @@
 #include <linux/pfn.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
+#include <linux/kexec.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/sections.h>
@@ -287,6 +288,11 @@ void __init setup_bootmem_allocator(unsigned long start_pfn)
                 }
         }
 #endif
+#ifdef CONFIG_KEXEC
+        if (crashk_res.start != crashk_res.end)
+                reserve_bootmem(crashk_res.start,
+                        crashk_res.end - crashk_res.start + 1);
+#endif
 }
 
 #ifndef CONFIG_NEED_MULTIPLE_NODES