Commit-ID: 0975904276552c8e201dad0ad31152ba8a21505a
Gitweb: http://git.kernel.org/tip/0975904276552c8e201dad0ad31152ba8a21505a
Author: Joerg Roedel <joerg.roedel@xxxxxxx>
AuthorDate: Tue, 9 Jun 2009 17:52:27 +0200
Committer: Joerg Roedel <joerg.roedel@xxxxxxx>
CommitDate: Mon, 15 Jun 2009 15:20:40 +0200
amd-iommu: disable IOMMU hardware on shutdown
When the IOMMU stays enabled the BIOS may not be able to finish the
machine shutdown properly. So disable the hardware on shutdown.
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
arch/x86/include/asm/amd_iommu.h | 2 ++
arch/x86/kernel/amd_iommu_init.c | 5 +++++
arch/x86/kernel/pci-dma.c | 2 ++
3 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/amd_iommu.h b/arch/x86/include/asm/amd_iommu.h
index 262e028..bdf96f1 100644
--- a/arch/x86/include/asm/amd_iommu.h
+++ b/arch/x86/include/asm/amd_iommu.h
@@ -29,9 +29,11 @@ extern void amd_iommu_detect(void);
extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
extern void amd_iommu_flush_all_domains(void);
extern void amd_iommu_flush_all_devices(void);
+extern void amd_iommu_shutdown(void);
#else
static inline int amd_iommu_init(void) { return -ENODEV; }
static inline void amd_iommu_detect(void) { }
+static inline void amd_iommu_shutdown(void) { }
#endif
#endif /* _ASM_X86_AMD_IOMMU_H */
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 238989e..575ca46 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1273,6 +1273,11 @@ free:
goto out;
}
+void amd_iommu_shutdown(void)
+{
+ disable_iommus();
+}
+
/****************************************************************************
*
* Early detect code. This code runs at IOMMU detection time in the DMA
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 745579b..328592f 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -290,6 +290,8 @@ static int __init pci_iommu_init(void)
void pci_iommu_shutdown(void)
{
gart_iommu_shutdown();
+
+ amd_iommu_shutdown();
}
/* Must execute after PCI subsystem */
fs_initcall(pci_iommu_init);
--
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