[PATCH] crashdump: x86 crashkernel option

This is the x86 implementation of the crashkernel option.  It reserves a
window of memory very early in the bootup process, so we never use it for
anything but the kernel to switch to when the running kernel panics.

In addition to reserving this memory a resource structure is registered so
looking at /proc/iomem it is clear what happened to that memory.

ISSUES:
Is it possible to implement this in a architecture generic way?
What should be done with architectures that always use an iommu and
thus don't report their RAM memory resources in /proc/iomem?

Signed-off-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/efi.c b/arch/i386/kernel/efi.c
index f732f427b418a02672409e8168f7701f032873bc..385883ea8c199d1008d0db050e1c71ec32ce64ec 100644 (file)
--- a/arch/i386/kernel/efi.c
+++ b/arch/i386/kernel/efi.c
@@ -30,6 +30,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/efi.h>
+#include <linux/kexec.h>
 
 #include <asm/setup.h>
 #include <asm/io.h>
@@ -598,6 +599,9 @@ efi_initialize_iomem_resources(struct resource *code_resource,
                if (md->type == EFI_CONVENTIONAL_MEMORY) {
                        request_resource(res, code_resource);
                        request_resource(res, data_resource);
+#ifdef CONFIG_KEXEC
+                       request_resource(res, &crashk_res);
+#endif
                }
        }
 }

diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 6337157f5df30b0fd3e33acc0f8e347aa3704672..d88ebdfa6ccd980c233cd206c7440b21af0ea476 100644 (file)
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -43,7 +43,10 @@
 #include <linux/init.h>
 #include <linux/edd.h>
 #include <linux/nodemask.h>
+#include <linux/kexec.h>
+
 #include <video/edid.h>
+
 #include <asm/apic.h>
 #include <asm/e820.h>
 #include <asm/mpspec.h>
@@ -846,6 +849,27 @@ static void __init parse_cmdline_early (char ** cmdline_p)
                        lapic_disable();
 #endif /* CONFIG_X86_LOCAL_APIC */
 
+#ifdef CONFIG_KEXEC
+               /* crashkernel=size@addr specifies the location to reserve for
+                * a crash kernel.  By reserving this memory we guarantee
+                * that linux never set's it up as a DMA target.
+                * Useful for holding code to do something appropriate
+                * after a kernel panic.
+                */
+               else if (!memcmp(from, "crashkernel=", 12)) {
+                       unsigned long size, base;
+                       size = memparse(from+12, &from);
+                       if (*from == '@') {
+                               base = memparse(from+1, &from);
+                               /* FIXME: Do I want a sanity check
+                                * to validate the memory range?
+                                */
+                               crashk_res.start = base;
+                               crashk_res.end   = base + size - 1;
+                       }
+               }
+#endif
+
                /*
                 * highmem=size forces highmem to be exactly 'size' bytes.
                 * This works even on boxes that have no highmem otherwise.
@@ -1181,6 +1205,11 @@ void __init setup_bootmem_allocator(void)
                }
        }
 #endif
+#ifdef CONFIG_KEXEC
+       if (crashk_res.start != crashk_res.end)
+               reserve_bootmem(crashk_res.start,
+                       crashk_res.end - crashk_res.start + 1);
+#endif
 }
 
 /*
@@ -1234,6 +1263,9 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
                         */
                        request_resource(res, code_resource);
                        request_resource(res, data_resource);
+#ifdef CONFIG_KEXEC
+                       request_resource(res, &crashk_res);
+#endif
                }
        }
 }

diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index f429c871e8450b5e344cf60aca1fc6cd97b01733..b358f0702a44fab313811594390f91fbd91aa7dc 100644 (file)
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -30,6 +30,8 @@
 #include <linux/initrd.h>
 #include <linux/nodemask.h>
 #include <linux/module.h>
+#include <linux/kexec.h>
+
 #include <asm/e820.h>
 #include <asm/setup.h>
 #include <asm/mmzone.h>