[edk2-devel] [PATCH v6 09/12] OvmfPkg/MptScsiDxe: Set and restore PCI attributes
Nikita Leshenko
nikita.leshchenko at oracle.com
Mon May 4 21:06:04 UTC 2020
Enable the IO Space and Bus Mastering and restore the original values
when the device is stopped. This is a standard procedure in PCI
drivers.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2390
Signed-off-by: Nikita Leshenko <nikita.leshchenko at oracle.com>
Reviewed-by: Liran Alon <liran.alon at oracle.com>
Reviewed-by: Laszlo Ersek <lersek at redhat.com>
---
OvmfPkg/MptScsiDxe/MptScsi.c | 65 +++++++++++++++++++++++++++++++++++-
1 file changed, 64 insertions(+), 1 deletion(-)
diff --git a/OvmfPkg/MptScsiDxe/MptScsi.c b/OvmfPkg/MptScsiDxe/MptScsi.c
index 3dfc78cf2e1f..289bd9fc372b 100644
--- a/OvmfPkg/MptScsiDxe/MptScsi.c
+++ b/OvmfPkg/MptScsiDxe/MptScsi.c
@@ -38,6 +38,7 @@ typedef struct {
EFI_EXT_SCSI_PASS_THRU_MODE PassThruMode;
UINT8 MaxTarget;
EFI_PCI_IO_PROTOCOL *PciIo;
+ UINT64 OriginalPciAttributes;
} MPT_SCSI_DEV;
#define MPT_SCSI_FROM_PASS_THRU(PassThruPtr) \
@@ -335,6 +336,53 @@ MptScsiControllerStart (
goto FreePool;
}
+ Status = Dev->PciIo->Attributes (
+ Dev->PciIo,
+ EfiPciIoAttributeOperationGet,
+ 0,
+ &Dev->OriginalPciAttributes
+ );
+ if (EFI_ERROR (Status)) {
+ goto CloseProtocol;
+ }
+
+ //
+ // Enable I/O Space & Bus-Mastering
+ //
+ Status = Dev->PciIo->Attributes (
+ Dev->PciIo,
+ EfiPciIoAttributeOperationEnable,
+ (EFI_PCI_IO_ATTRIBUTE_IO |
+ EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),
+ NULL
+ );
+ if (EFI_ERROR (Status)) {
+ goto CloseProtocol;
+ }
+
+ //
+ // Signal device supports 64-bit DMA addresses
+ //
+ Status = Dev->PciIo->Attributes (
+ Dev->PciIo,
+ EfiPciIoAttributeOperationEnable,
+ EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE,
+ NULL
+ );
+ if (EFI_ERROR (Status)) {
+ //
+ // Warn user that device will only be using 32-bit DMA addresses.
+ //
+ // Note that this does not prevent the device/driver from working
+ // and therefore we only warn and continue as usual.
+ //
+ DEBUG ((
+ DEBUG_WARN,
+ "%a: failed to enable 64-bit DMA addresses\n",
+ __FUNCTION__
+ ));
+ }
+
//
// Host adapter channel, doesn't exist
//
@@ -359,11 +407,19 @@ MptScsiControllerStart (
&Dev->PassThru
);
if (EFI_ERROR (Status)) {
- goto CloseProtocol;
+ goto RestoreAttributes;
}
return EFI_SUCCESS;
+RestoreAttributes:
+ Dev->PciIo->Attributes (
+ Dev->PciIo,
+ EfiPciIoAttributeOperationSet,
+ Dev->OriginalPciAttributes,
+ NULL
+ );
+
CloseProtocol:
gBS->CloseProtocol (
ControllerHandle,
@@ -415,6 +471,13 @@ MptScsiControllerStop (
return Status;
}
+ Dev->PciIo->Attributes (
+ Dev->PciIo,
+ EfiPciIoAttributeOperationSet,
+ Dev->OriginalPciAttributes,
+ NULL
+ );
+
gBS->CloseProtocol (
ControllerHandle,
&gEfiPciIoProtocolGuid,
--
2.20.1
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