iommu: amd: Fix incorrect PASID decoding from event log

iommu: amd: Fix incorrect PASID decoding from event log

[Suthikulpanit, Suravee]

IOMMU Event Log encodes 20-bit PASID for events:
    ILLEGAL_DEV_TABLE_ENTRY
    IO_PAGE_FAULT
    PAGE_TAB_HARDWARE_ERROR
    INVALID_DEVICE_REQUEST
as:
    PASID[15:0]  = bit 47:32
    PASID[19:16] = bit 19:16

Note that INVALID_PPR_REQUEST event has different encoding
from the rest of the events as the following:
    PASID[15:0]  = bit 31:16
    PASID[19:16] = bit 45:42

So, fixes the decoding logic.

Fixes: d64c0486ed50 ("iommu/amd: Update the PASID information printed to the system log")
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
 drivers/iommu/amd_iommu.c       | 5 +++--
 drivers/iommu/amd_iommu_types.h | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 61de819..c1cb759 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -560,7 +560,8 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
 retry:
 	type    = (event[1] >> EVENT_TYPE_SHIFT)  & EVENT_TYPE_MASK;
 	devid   = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
-	pasid   = PPR_PASID(*(u64 *)&event[0]);
+	pasid   = (event[0] & EVENT_DOMID_MASK_HI) |
+		  (event[1] & EVENT_DOMID_MASK_LO);
 	flags   = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
 	address = (u64)(((u64)event[3]) << 32) | event[2];
 
@@ -593,7 +594,7 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
 			address, flags);
 		break;
 	case EVENT_TYPE_PAGE_TAB_ERR:
-		dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x domain=0x%04x address=0x%llx flags=0x%04x]\n",
+		dev_err(dev, "Event logged [PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x pasid=0x%04x address=0x%llx flags=0x%04x]\n",
 			PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
 			pasid, address, flags);
 		break;
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 64edd5a..5a698ad 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -130,8 +130,8 @@
 #define EVENT_TYPE_INV_PPR_REQ	0x9
 #define EVENT_DEVID_MASK	0xffff
 #define EVENT_DEVID_SHIFT	0
-#define EVENT_DOMID_MASK	0xffff
-#define EVENT_DOMID_SHIFT	0
+#define EVENT_DOMID_MASK_LO	0xffff
+#define EVENT_DOMID_MASK_HI	0xf0000
 #define EVENT_FLAGS_MASK	0xfff
 #define EVENT_FLAGS_SHIFT	0x10
 
-- 
1.8.3.1

Re: iommu: amd: Fix incorrect PASID decoding from event log

[joro]

On Mon, Oct 14, 2019 at 08:06:05PM +0000, Suthikulpanit, Suravee wrote:
> IOMMU Event Log encodes 20-bit PASID for events:
>     ILLEGAL_DEV_TABLE_ENTRY
>     IO_PAGE_FAULT
>     PAGE_TAB_HARDWARE_ERROR
>     INVALID_DEVICE_REQUEST
> as:
>     PASID[15:0]  = bit 47:32
>     PASID[19:16] = bit 19:16
> 
> Note that INVALID_PPR_REQUEST event has different encoding
> from the rest of the events as the following:
>     PASID[15:0]  = bit 31:16
>     PASID[19:16] = bit 45:42
> 
> So, fixes the decoding logic.
> 
> Fixes: d64c0486ed50 ("iommu/amd: Update the PASID information printed to the system log")
> Cc: Joerg Roedel <jroedel@suse.de>
> Cc: Gary R Hook <gary.hook@amd.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
>  drivers/iommu/amd_iommu.c       | 5 +++--
>  drivers/iommu/amd_iommu_types.h | 4 ++--
>  2 files changed, 5 insertions(+), 4 deletions(-)

Applied for v5.4, thanks Suravee.