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| author | Joerg Roedel <jroedel@suse.de> | 2017-06-15 10:36:22 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-06-16 10:21:05 +0200 |
| commit | 54bd63570484167cb13edf81e31fff107b879981 (patch) | |
| tree | 28e5fe4889ba7e939a9f78c51c0b50d73a6e9092 /drivers/iommu/amd_iommu_init.c | |
| parent | ac3b708ad49f77b44faa104057783f161491e9e4 (diff) | |
| download | linux-54bd63570484167cb13edf81e31fff107b879981.tar.bz2 | |
iommu/amd: Suppress IO_PAGE_FAULTs in kdump kernel
When booting into a kdump kernel, suppress IO_PAGE_FAULTs by
default for all devices. But allow the faults again when a
domain is assigned to a device.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 3fa7e3b35507..cf7896550e75 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -29,6 +29,7 @@ #include <linux/export.h> #include <linux/iommu.h> #include <linux/kmemleak.h> +#include <linux/crash_dump.h> #include <asm/pci-direct.h> #include <asm/iommu.h> #include <asm/gart.h> @@ -1900,6 +1901,14 @@ static void init_device_table_dma(void) for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) { set_dev_entry_bit(devid, DEV_ENTRY_VALID); set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION); + /* + * In kdump kernels in-flight DMA from the old kernel might + * cause IO_PAGE_FAULTs. There are no reports that a kdump + * actually failed because of that, so just disable fault + * reporting in the hardware to get rid of the messages + */ + if (is_kdump_kernel()) + set_dev_entry_bit(devid, DEV_ENTRY_NO_PAGE_FAULT); } } |