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amd-iommu: disable IOMMU hardware on shutdown

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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@amd.com>
This commit is contained in:
Joerg Roedel 2009-06-09 17:52:27 +02:00
parent 92db1e6af7
commit 0975904276
3 changed files with 9 additions and 0 deletions
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2
arch/x86/include/asm/amd_iommu.h
View file

@ -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 */

5
arch/x86/kernel/amd_iommu_init.c
View file

@ -1273,6 +1273,11 @@ int __init amd_iommu_init(void)
goto out;
}
void amd_iommu_shutdown(void)
{
disable_iommus();
}
/****************************************************************************
*
* Early detect code. This code runs at IOMMU detection time in the DMA

2
arch/x86/kernel/pci-dma.c
View file

@ -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);