5cce852404
This is the code that will do the actual communication between OVMF and a PV block backend, where the block device lives. The protocol used is describe in the blkif.h header. This implementation originally comes from Mini-OS, a part of the Xen Project. Change in V4: - add file header to BlockFront.h (license, copyright, brief desc) Change in V3: - Improve comment of XenBusReadUint64. - Moving blkif.h to this patch with the necessary #pragma pack(4) applied for Ia32. - Add a note about the license in the commit message - Add "The protocol used is describe in the blkif.h header." in the commit message - Have a mandatory sector-size multiple of 512 or fail to initialize. - use Sector instead of Offset for IO request. with Sector been 512-byte unit. - print something if EventChannelNotify return an error. Change in V2: - trigger CoW is probably not needed on OVMF (as opposed to Mini-OS), removed the test. - comments - renamed XenbusReadInteger to XenBusReadUint64 - remove callback from IoData, use simple status instead - return a status from the synchronus io - Close protocol if blockfront init fail. - fix few debug print - Rename XenbusIo to XenBusIo - XenPvBlkWaitForBackendState will return an error if the new backend states is not the expected state. - Add the license License: This patch adds some files which are under the MIT license. Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Acked-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16273 6f19259b-4bc3-4df7-8a09-765794883524
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/** @file
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BlockFront functions and types declarations.
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Copyright (C) 2014, Citrix Ltd.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "XenPvBlkDxe.h"
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#include <IndustryStandard/Xen/event_channel.h>
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#include <IndustryStandard/Xen/io/blkif.h>
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typedef struct _XEN_BLOCK_FRONT_DEVICE XEN_BLOCK_FRONT_DEVICE;
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typedef struct _XEN_BLOCK_FRONT_IO XEN_BLOCK_FRONT_IO;
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struct _XEN_BLOCK_FRONT_IO
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{
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XEN_BLOCK_FRONT_DEVICE *Dev;
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UINT8 *Buffer;
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UINTN Size;
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UINTN Sector; ///< 512 bytes sector.
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grant_ref_t GrantRef[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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INT32 NumRef;
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EFI_STATUS Status;
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};
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typedef struct
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{
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UINT64 Sectors;
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UINT32 SectorSize;
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UINT32 VDiskInfo;
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BOOLEAN ReadWrite;
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BOOLEAN CdRom;
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BOOLEAN FeatureBarrier;
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BOOLEAN FeatureFlushCache;
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} XEN_BLOCK_FRONT_MEDIA_INFO;
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#define XEN_BLOCK_FRONT_SIGNATURE SIGNATURE_32 ('X', 'p', 'v', 'B')
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struct _XEN_BLOCK_FRONT_DEVICE {
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UINT32 Signature;
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EFI_BLOCK_IO_PROTOCOL BlockIo;
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domid_t DomainId;
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blkif_front_ring_t Ring;
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grant_ref_t RingRef;
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evtchn_port_t EventChannel;
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blkif_vdev_t DeviceId;
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CONST CHAR8 *NodeName;
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XEN_BLOCK_FRONT_MEDIA_INFO MediaInfo;
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VOID *StateWatchToken;
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XENBUS_PROTOCOL *XenBusIo;
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};
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#define XEN_BLOCK_FRONT_FROM_BLOCK_IO(b) \
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CR (b, XEN_BLOCK_FRONT_DEVICE, BlockIo, XEN_BLOCK_FRONT_SIGNATURE)
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EFI_STATUS
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XenPvBlockFrontInitialization (
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IN XENBUS_PROTOCOL *XenBusIo,
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IN CONST CHAR8 *NodeName,
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OUT XEN_BLOCK_FRONT_DEVICE **DevPtr
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);
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VOID
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XenPvBlockFrontShutdown (
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IN XEN_BLOCK_FRONT_DEVICE *Dev
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);
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VOID
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XenPvBlockAsyncIo (
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IN OUT XEN_BLOCK_FRONT_IO *IoData,
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IN BOOLEAN IsWrite
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);
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EFI_STATUS
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XenPvBlockIo (
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IN OUT XEN_BLOCK_FRONT_IO *IoData,
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IN BOOLEAN IsWrite
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);
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VOID
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XenPvBlockAsyncIoPoll (
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IN XEN_BLOCK_FRONT_DEVICE *Dev
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);
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VOID
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XenPvBlockSync (
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IN XEN_BLOCK_FRONT_DEVICE *Dev
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);
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