Here is a patch to do that. We use this internally, but
I had forgotten to post it.
Not that it matters a huge amount, but this has been in RHEL5 for
sometime and does fix the "machvec=dig" nuisance.
(Sorry for not replying earlier Terry -- I had a huge backlog of things
to get to before this ...)
P.
-T
---
diff --git a/arch/ia64/hp/common/sba_iommu.c
b/arch/ia64/hp/common/sba_iommu.c
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -42,6 +42,9 @@ #include <asm/dma.h>
#include <asm/system.h> /* wmb() */
#include <asm/acpi-ext.h>
+#include <linux/crash_dump.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;
+#ifdef 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.
-
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