1 files changed, 18 insertions, 2 deletions

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index c1dca226b479..cd4adf52f174 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -34,6 +34,7 @@
 #include <linux/efi.h>
 #include <linux/nodemask.h>
 #include <linux/bitops.h>         /* hweight64() */
+#include <linux/crash_dump.h>
 
 #include <asm/delay.h>          /* ia64_get_itc() */
 #include <asm/io.h>
@@ -43,6 +44,8 @@
 
 #include <asm/acpi-ext.h>
 
+extern int swiotlb_late_init_with_default_size (size_t size);
+
 #define PFX "IOC: "
 
 /*
@@ -2026,11 +2029,24 @@ sba_init(void)
         if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
                 return 0;
 
+#if defined(CONFIG_IA64_GENERIC) && defined(CONFIG_CRASH_DUMP)
+        /* If we are booting a kdump kernel, the sba_iommu will
+         * cause devices that were not shutdown properly to MCA
+         * as soon as they are turned back on.  Our only option for
+         * a successful kdump kernel boot is to use the swiotlb.
+         */
+        if (elfcorehdr_addr < ELFCORE_ADDR_MAX) {
+                if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
+                        panic("Unable to initialize software I/O TLB:"
+                                  " Try machvec=dig boot option");
+                machvec_init("dig");
+                return 0;
+        }
+#endif
+
         acpi_bus_register_driver(&acpi_sba_ioc_driver);
         if (!ioc_list) {
 #ifdef CONFIG_IA64_GENERIC
-                extern int swiotlb_late_init_with_default_size (size_t size);
-
                 /*
                  * If we didn't find something sba_iommu can claim, we
                  * need to setup the swiotlb and switch to the dig machvec.