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| author | Liran Alon <liran.alon@oracle.com> | 2020-03-28 23:00:57 +0300 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-03-30 16:45:07 +0000 |
| commit | 6510e1979491d28c82944e0cfdab5713d482efa1 (patch) | |
| tree | 7d371356f51731ec9dbcf7c89241a32262afa3e6 /OvmfPkg | |
| parent | b654edec034a5e5dcc440f2f30fd2aa6c31aef3c (diff) | |
| download | edk2-6510e1979491d28c82944e0cfdab5713d482efa1.tar.gz edk2-6510e1979491d28c82944e0cfdab5713d482efa1.tar.bz2 edk2-6510e1979491d28c82944e0cfdab5713d482efa1.zip | |
OvmfPkg/PvScsiDxe: Introduce DMA communication buffer
In case device is constrained by IOMMU or guest is running under AMD SEV,
input/output buffers provided to device (DataBuffer and SenseData) needs
to be explicitly mapped to device by PciIo->Map().
To avoid the overhead of mapping/unmapping the DataBuffer and SenseData
to the device for every SCSI requst (and to simplify code), introduce a
single DMA communication buffer that will be mapped to device on
initialization. When a SCSI request needs to be sent to device, the
DataBuffer and SenseData will be copied from/to the DMA communication
buffer as required. This will be done by the following commits.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200328200100.60786-15-liran.alon@oracle.com>
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'OvmfPkg')
| -rw-r--r-- | OvmfPkg/PvScsiDxe/PvScsi.c | 40 | ||||
| -rw-r--r-- | OvmfPkg/PvScsiDxe/PvScsi.h | 20 |
2 files changed, 58 insertions, 2 deletions
diff --git a/OvmfPkg/PvScsiDxe/PvScsi.c b/OvmfPkg/PvScsiDxe/PvScsi.c index c7d367e83a..6e350bb2d6 100644 --- a/OvmfPkg/PvScsiDxe/PvScsi.c +++ b/OvmfPkg/PvScsiDxe/PvScsi.c @@ -678,6 +678,19 @@ PvScsiInit ( }
//
+ // Allocate DMA communication buffer
+ //
+ Status = PvScsiAllocateSharedPages (
+ Dev,
+ EFI_SIZE_TO_PAGES (sizeof (*Dev->DmaBuf)),
+ (VOID **)&Dev->DmaBuf,
+ &Dev->DmaBufDmaDesc
+ );
+ if (EFI_ERROR (Status)) {
+ goto FreeRings;
+ }
+
+ //
// Populate the exported interface's attributes
//
Dev->PassThru.Mode = &Dev->PassThruMode;
@@ -708,6 +721,15 @@ PvScsiInit ( return EFI_SUCCESS;
+FreeRings:
+ //
+ // Reset device to stop device usage of the rings.
+ // This is required to safely free the rings.
+ //
+ PvScsiResetAdapter (Dev);
+
+ PvScsiFreeRings (Dev);
+
RestorePciAttributes:
PvScsiRestorePciAttributes (Dev);
@@ -721,11 +743,25 @@ PvScsiUninit ( )
{
//
- // Reset device to stop device usage of the rings.
- // This is required to safely free the rings.
+ // Reset device to:
+ // - Make device stop processing all requests.
+ // - Stop device usage of the rings.
+ //
+ // This is required to safely free the DMA communication buffer
+ // and the rings.
//
PvScsiResetAdapter (Dev);
+ //
+ // Free DMA communication buffer
+ //
+ PvScsiFreeSharedPages (
+ Dev,
+ EFI_SIZE_TO_PAGES (sizeof (*Dev->DmaBuf)),
+ Dev->DmaBuf,
+ &Dev->DmaBufDmaDesc
+ );
+
PvScsiFreeRings (Dev);
PvScsiRestorePciAttributes (Dev);
diff --git a/OvmfPkg/PvScsiDxe/PvScsi.h b/OvmfPkg/PvScsiDxe/PvScsi.h index 6d23b6e1ec..fff12146dc 100644 --- a/OvmfPkg/PvScsiDxe/PvScsi.h +++ b/OvmfPkg/PvScsiDxe/PvScsi.h @@ -31,6 +31,21 @@ typedef struct { PVSCSI_DMA_DESC RingCmpsDmaDesc;
} PVSCSI_RING_DESC;
+typedef struct {
+ //
+ // As EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET.SenseDataLength is defined
+ // as UINT8, defining here SenseData size to MAX_UINT8 will guarantee it
+ // cannot overflow when passed to device.
+ //
+ UINT8 SenseData[MAX_UINT8];
+ //
+ // This size of the data is arbitrarily chosen.
+ // It seems to be sufficient for all I/O requests sent through
+ // EFI_SCSI_PASS_THRU_PROTOCOL.PassThru() for common boot scenarios.
+ //
+ UINT8 Data[0x2000];
+} PVSCSI_DMA_BUFFER;
+
#define PVSCSI_SIG SIGNATURE_32 ('P', 'S', 'C', 'S')
typedef struct {
@@ -38,6 +53,8 @@ typedef struct { EFI_PCI_IO_PROTOCOL *PciIo;
UINT64 OriginalPciAttributes;
PVSCSI_RING_DESC RingDesc;
+ PVSCSI_DMA_BUFFER *DmaBuf;
+ PVSCSI_DMA_DESC DmaBufDmaDesc;
UINT8 MaxTarget;
UINT8 MaxLun;
EFI_EXT_SCSI_PASS_THRU_PROTOCOL PassThru;
@@ -47,4 +64,7 @@ typedef struct { #define PVSCSI_FROM_PASS_THRU(PassThruPointer) \
CR (PassThruPointer, PVSCSI_DEV, PassThru, PVSCSI_SIG)
+#define PVSCSI_DMA_BUF_DEV_ADDR(Dev, MemberName) \
+ (Dev->DmaBufDmaDesc.DeviceAddress + OFFSET_OF(PVSCSI_DMA_BUFFER, MemberName))
+
#endif // __PVSCSI_DXE_H_
|