From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 9 Jun 2009 15:56:09 +0000 (+0200)
Subject: x86: disable IOMMUs on kernel crash
X-Git-Tag: firefly_0821_release~13473^2~1^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=61d047be99757fd9b0af900d7abce9a13a337488;p=firefly-linux-kernel-4.4.55.git

x86: disable IOMMUs on kernel crash

If the IOMMUs are still enabled when the kexec kernel boots access to
the disk is not possible. This is bad for tools like kdump or anything
else which wants to use PCI devices.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index ff958248e61d..5e409dc298a4 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -27,6 +27,7 @@
 #include <asm/cpu.h>
 #include <asm/reboot.h>
 #include <asm/virtext.h>
+#include <asm/iommu.h>
 
 
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
@@ -103,5 +104,10 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
 #ifdef CONFIG_HPET_TIMER
 	hpet_disable();
 #endif
+
+#ifdef CONFIG_X86_64
+	pci_iommu_shutdown();
+#endif
+
 	crash_save_cpu(regs, safe_smp_processor_id());
 }