OvmfPkg/LsiScsiDxe: Map DMA buffer

Map DMA buffer and perpare for the implementation of LsiScsiPassThru().

v2:
  - Replace 0x10000 with SIZE_64KB macro for the DMA buffer data array
  - Remove DUAL_ADDRESS_CYCLE from PciIo since we don't really need
    64-bit DMA address

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200717061130.8881-9-glin@suse.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/OvmfPkg/LsiScsiDxe/LsiScsi.h b/OvmfPkg/LsiScsiDxe/LsiScsi.h
index 8c2acff6e8..9f9e5c7fed 100644
--- a/OvmfPkg/LsiScsiDxe/LsiScsi.h
+++ b/OvmfPkg/LsiScsiDxe/LsiScsi.h
@@ -13,12 +13,26 @@
 #define _LSI_SCSI_DXE_H_

 

 typedef struct {

+  //

+  // Allocate 64KB for read/write buffer. It seems sufficient for the common

+  // boot scenarios.

+  //

+  // NOTE: The number of bytes for data transmission is bounded by DMA Byte

+  //       Count (DBC), a 24-bit register, so the maximum is 0xFFFFFF (16MB-1).

+  //

+  UINT8                           Data[SIZE_64KB];

+} LSI_SCSI_DMA_BUFFER;

+

+typedef struct {

   UINT32                          Signature;

   UINT64                          OrigPciAttrs;

   EFI_EVENT                       ExitBoot;

   EFI_PCI_IO_PROTOCOL             *PciIo;

   UINT8                           MaxTarget;

   UINT8                           MaxLun;

+  LSI_SCSI_DMA_BUFFER             *Dma;

+  EFI_PHYSICAL_ADDRESS            DmaPhysical;

+  VOID                            *DmaMapping;

   EFI_EXT_SCSI_PASS_THRU_MODE     PassThruMode;

   EFI_EXT_SCSI_PASS_THRU_PROTOCOL PassThru;

 } LSI_SCSI_DEV;