[PATCH v9 03/13] Revert "iommu/amd: Suppress IO_PAGE_FAULTs in kdump kernel"

Baoquan He
2017-08-01T11:37:46Z

This reverts commit 54bd63570484167cb13edf81e31fff107b879981.

We still need the IO_PAGE_FAULT message to warn error after the
issue of on-flight dma in kdump kernel is fixed.

Signed-off-by: Baoquan He <bhe@redhat.com>
---
drivers/iommu/amd_iommu.c | 3 +--
drivers/iommu/amd_iommu_init.c | 9 ---------
drivers/iommu/amd_iommu_types.h | 1 -
3 files changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 688e77576e5a..e8a6d8109564 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2086,8 +2086,7 @@ static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
flags |= tmp;
}

-
- flags &= ~(DTE_FLAG_SA | 0xffffULL);
+ flags &= ~(0xffffUL);
flags |= domain->id;

amd_iommu_dev_table[devid].data[1] = flags;
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index b36c145c498d..8896137f17af 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -29,7 +29,6 @@
#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>
@@ -1942,14 +1941,6 @@ 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);
}
}

diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 0c98b2cf04cc..db7ceb4d0957 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -322,7 +322,6 @@
#define IOMMU_PTE_IW (1ULL << 62)

#define DTE_FLAG_IOTLB (1ULL << 32)
-#define DTE_FLAG_SA (1ULL << 34)
#define DTE_FLAG_GV (1ULL << 55)
#define DTE_FLAG_MASK (0x3ffULL << 32)
#define DTE_GLX_SHIFT (56)
--
2.5.5