x86: Use x86_platform for iommu_shutdown

This patch cleans up pci_iommu_shutdown() a bit to use
x86_platform (similar to how IA64 initializes an IOMMU driver).

This adds iommu_shutdown() to x86_platform to avoid calling
every IOMMUs' shutdown functions in pci_iommu_shutdown() in
order. The IOMMU shutdown functions are platform specific (we
don't have multiple different IOMMU hardware) so the current way
is pointless.

An IOMMU driver sets x86_platform.iommu_shutdown to the shutdown
function if necessary.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: joerg.roedel@amd.com
LKML-Reference: <20091027163358F.fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 4449a4a2c2ed..bc9b230ef402 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -14,6 +14,7 @@
 #include <asm/time.h>
 #include <asm/irq.h>
 #include <asm/tsc.h>
+#include <asm/iommu.h>
 
 void __cpuinit x86_init_noop(void) { }
 void __init x86_init_uint_noop(unsigned int unused) { }
@@ -72,4 +73,5 @@ struct x86_platform_ops x86_platform = {
         .calibrate_tsc                  = native_calibrate_tsc,
         .get_wallclock                  = mach_get_cmos_time,
         .set_wallclock                  = mach_set_rtc_mmss,
+        .iommu_shutdown                 = iommu_shutdown_noop,
 };