diff options
Diffstat (limited to 'drivers/staging/hv/StorVscApi.h')
-rw-r--r-- | drivers/staging/hv/StorVscApi.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/staging/hv/StorVscApi.h b/drivers/staging/hv/StorVscApi.h new file mode 100644 index 00000000000..69c14066c47 --- /dev/null +++ b/drivers/staging/hv/StorVscApi.h @@ -0,0 +1,113 @@ +/* + * + * Copyright (c) 2009, Microsoft Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Authors: + * Haiyang Zhang <haiyangz@microsoft.com> + * Hank Janssen <hjanssen@microsoft.com> + * + */ + + +#ifndef _STORVSC_API_H_ +#define _STORVSC_API_H_ + +#include "VmbusApi.h" + +/* Defines */ +#define STORVSC_RING_BUFFER_SIZE (10*PAGE_SIZE) +#define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) + +#define STORVSC_MAX_IO_REQUESTS 64 + +/* + * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In + * reality, the path/target is not used (ie always set to 0) so our + * scsi host adapter essentially has 1 bus with 1 target that contains + * up to 256 luns. + */ +#define STORVSC_MAX_LUNS_PER_TARGET 64 +#define STORVSC_MAX_TARGETS 1 +#define STORVSC_MAX_CHANNELS 1 + +struct hv_storvsc_request; + +/* Matches Windows-end */ +enum storvsc_request_type{ + WRITE_TYPE, + READ_TYPE, + UNKNOWN_TYPE, +}; + +struct hv_storvsc_request { + enum storvsc_request_type Type; + u32 Host; + u32 Bus; + u32 TargetId; + u32 LunId; + u8 *Cdb; + u32 CdbLen; + u32 Status; + u32 BytesXfer; + + unsigned char *SenseBuffer; + u32 SenseBufferSize; + + void *Context; + + void (*OnIOCompletion)(struct hv_storvsc_request *Request); + + /* This points to the memory after DataBuffer */ + void *Extension; + + struct hv_multipage_buffer DataBuffer; +}; + +/* Represents the block vsc driver */ +struct storvsc_driver_object { + /* Must be the first field */ + /* Which is a bug FIXME! */ + struct hv_driver Base; + + /* Set by caller (in bytes) */ + u32 RingBufferSize; + + /* Allocate this much private extension for each I/O request */ + u32 RequestExtSize; + + /* Maximum # of requests in flight per channel/device */ + u32 MaxOutstandingRequestsPerChannel; + + /* Set by the caller to allow us to re-enumerate the bus on the host */ + void (*OnHostRescan)(struct hv_device *Device); + + /* Specific to this driver */ + int (*OnIORequest)(struct hv_device *Device, + struct hv_storvsc_request *Request); + int (*OnHostReset)(struct hv_device *Device); +}; + +struct storvsc_device_info { + unsigned int PortNumber; + unsigned char PathId; + unsigned char TargetId; +}; + +/* Interface */ +int StorVscInitialize(struct hv_driver *driver); +int BlkVscInitialize(struct hv_driver *driver); + +#endif /* _STORVSC_API_H_ */ |