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/*
* VMware PVSCSI header file
*
* Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; version 2 of the License and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained by: Arvind Kumar <arvindkumar@vmware.com>
*
*/

#ifndef _VMW_PVSCSI_H_
#define _VMW_PVSCSI_H_

#include <linux/types.h>

#define PVSCSI_DRIVER_VERSION_STRING "1.0.5.0-k"

#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128

#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */

#define PCI_VENDOR_ID_VMWARE 0x15AD
#define PCI_DEVICE_ID_VMWARE_PVSCSI 0x07C0

/*
* host adapter status/error codes
*/
enum HostBusAdapterStatus {
BTSTAT_SUCCESS = 0x00, /* CCB complete normally with no errors */
BTSTAT_LINKED_COMMAND_COMPLETED = 0x0a,
BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG = 0x0b,
BTSTAT_DATA_UNDERRUN = 0x0c,
BTSTAT_SELTIMEO = 0x11, /* SCSI selection timeout */
BTSTAT_DATARUN = 0x12, /* data overrun/underrun */
BTSTAT_BUSFREE = 0x13, /* unexpected bus free */
BTSTAT_INVPHASE = 0x14, /* invalid bus phase or sequence
* requested by target */
BTSTAT_LUNMISMATCH = 0x17, /* linked CCB has different LUN from
* first CCB */
BTSTAT_INVPARAM = 0x1a, /* invalid parameter in CCB or segment
* list */
BTSTAT_SENSFAILED = 0x1b, /* auto request sense failed */
BTSTAT_TAGREJECT = 0x1c, /* SCSI II tagged queueing message
* rejected by target */
BTSTAT_BADMSG = 0x1d, /* unsupported message received by the
* host adapter */
BTSTAT_HAHARDWARE = 0x20, /* host adapter hardware failed */
BTSTAT_NORESPONSE = 0x21, /* target did not respond to SCSI ATN,
* sent a SCSI RST */
BTSTAT_SENTRST = 0x22, /* host adapter asserted a SCSI RST */
BTSTAT_RECVRST = 0x23, /* other SCSI devices asserted a SCSI
* RST */
BTSTAT_DISCONNECT = 0x24, /* target device reconnected improperly
* (w/o tag) */
BTSTAT_BUSRESET = 0x25, /* host adapter issued BUS device reset */
BTSTAT_ABORTQUEUE = 0x26, /* abort queue generated */
BTSTAT_HASOFTWARE = 0x27, /* host adapter software error */
BTSTAT_HATIMEOUT = 0x30, /* host adapter hardware timeout error */
BTSTAT_SCSIPARITY = 0x34, /* SCSI parity error detected */
};

/*
* SCSI device status values.
*/
enum ScsiDeviceStatus {
SDSTAT_GOOD = 0x00, /* No errors. */
SDSTAT_CHECK = 0x02, /* Check condition. */
};

/*
* Register offsets.
*
* These registers are accessible both via i/o space and mm i/o.
*/

enum PVSCSIRegOffset {
PVSCSI_REG_OFFSET_COMMAND = 0x0,
PVSCSI_REG_OFFSET_COMMAND_DATA = 0x4,
PVSCSI_REG_OFFSET_COMMAND_STATUS = 0x8,
PVSCSI_REG_OFFSET_LAST_STS_0 = 0x100,
PVSCSI_REG_OFFSET_LAST_STS_1 = 0x104,
PVSCSI_REG_OFFSET_LAST_STS_2 = 0x108,
PVSCSI_REG_OFFSET_LAST_STS_3 = 0x10c,
PVSCSI_REG_OFFSET_INTR_STATUS = 0x100c,
PVSCSI_REG_OFFSET_INTR_MASK = 0x2010,
PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014,
PVSCSI_REG_OFFSET_DEBUG = 0x3018,
PVSCSI_REG_OFFSET_KICK_RW_IO = 0x4018,
};

/*
* Virtual h/w commands.
*/

enum PVSCSICommands {
PVSCSI_CMD_FIRST = 0, /* has to be first */

PVSCSI_CMD_ADAPTER_RESET = 1,
PVSCSI_CMD_ISSUE_SCSI = 2,
PVSCSI_CMD_SETUP_RINGS = 3,
PVSCSI_CMD_RESET_BUS = 4,
PVSCSI_CMD_RESET_DEVICE = 5,
PVSCSI_CMD_ABORT_CMD = 6,
PVSCSI_CMD_CONFIG = 7,
PVSCSI_CMD_SETUP_MSG_RING = 8,
PVSCSI_CMD_DEVICE_UNPLUG = 9,
PVSCSI_CMD_SETUP_REQCALLTHRESHOLD = 10,

PVSCSI_CMD_LAST = 11 /* has to be last */
};

/*
* Command descriptor for PVSCSI_CMD_RESET_DEVICE --
*/

struct PVSCSICmdDescResetDevice {
u32 target;
u8 lun[8];
} __packed;

/*
* Command descriptor for PVSCSI_CMD_CONFIG --
*/

struct PVSCSICmdDescConfigCmd {
u64 cmpAddr;
u64 configPageAddress;
u32 configPageNum;
u32 _pad;
} __packed;

/*
* Command descriptor for PVSCSI_CMD_SETUP_REQCALLTHRESHOLD --
*/

struct PVSCSICmdDescSetupReqCall {
u32 enable;
} __packed;

enum PVSCSIConfigPageType {
PVSCSI_CONFIG_PAGE_CONTROLLER = 0x1958,
PVSCSI_CONFIG_PAGE_PHY = 0x1959,
PVSCSI_CONFIG_PAGE_DEVICE = 0x195a,
};

enum PVSCSIConfigPageAddressType {
PVSCSI_CONFIG_CONTROLLER_ADDRESS = 0x2120,
PVSCSI_CONFIG_BUSTARGET_ADDRESS = 0x2121,
PVSCSI_CONFIG_PHY_ADDRESS = 0x2122,
};

/*
* Command descriptor for PVSCSI_CMD_ABORT_CMD --
*
* - currently does not support specifying the LUN.
* - _pad should be 0.
*/

struct PVSCSICmdDescAbortCmd {
u64 context;
u32 target;
u32 _pad;
} __packed;

/*
* Command descriptor for PVSCSI_CMD_SETUP_RINGS --
*
* Notes:
* - reqRingNumPages and cmpRingNumPages need to be power of two.
* - reqRingNumPages and cmpRingNumPages need to be different from 0,
* - reqRingNumPages and cmpRingNumPages need to be inferior to
* PVSCSI_SETUP_RINGS_MAX_NUM_PAGES.
*/

#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES 32
struct PVSCSICmdDescSetupRings {
u32 reqRingNumPages;
u32 cmpRingNumPages;
u64 ringsStatePPN;
u64 reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
u64 cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
} __packed;

/*
* Command descriptor for PVSCSI_CMD_SETUP_MSG_RING --
*
* Notes:
* - this command was not supported in the initial revision of the h/w
* interface. Before using it, you need to check that it is supported by
* writing PVSCSI_CMD_SETUP_MSG_RING to the 'command' register, then
* immediately after read the 'command status' register:
* * a value of -1 means that the cmd is NOT supported,
* * a value != -1 means that the cmd IS supported.
* If it's supported the 'command status' register should return:
* sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(u32).
* - this command should be issued _after_ the usual SETUP_RINGS so that the
* RingsState page is already setup. If not, the command is a nop.
* - numPages needs to be a power of two,
* - numPages needs to be different from 0,
* - _pad should be zero.
*/

#define PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES 16

struct PVSCSICmdDescSetupMsgRing {
u32 numPages;
u32 _pad;
u64 ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
} __packed;

enum PVSCSIMsgType {
PVSCSI_MSG_DEV_ADDED = 0,
PVSCSI_MSG_DEV_REMOVED = 1,
PVSCSI_MSG_LAST = 2,
};

/*
* Msg descriptor.
*
* sizeof(struct PVSCSIRingMsgDesc) == 128.
*
* - type is of type enum PVSCSIMsgType.
* - the content of args depend on the type of event being delivered.
*/

struct PVSCSIRingMsgDesc {
u32 type;
u32 args[31];
} __packed;

struct PVSCSIMsgDescDevStatusChanged {
u32 type; /* PVSCSI_MSG_DEV _ADDED / _REMOVED */
u32 bus;
u32 target;
u8 lun[8];
u32 pad[27];
} __packed;

/*
* Rings state.
*
* - the fields:
* . msgProdIdx,
* . msgConsIdx,
* . msgNumEntriesLog2,
* .. are only used once the SETUP_MSG_RING cmd has been issued.
* - '_pad' helps to ensure that the msg related fields are on their own
* cache-line.
*/

struct PVSCSIRingsState {
u32 reqProdIdx;
u32 reqConsIdx;
u32 reqNumEntriesLog2;

u32 cmpProdIdx;
u32 cmpConsIdx;
u32 cmpNumEntriesLog2;

u32 reqCallThreshold;

u8 _pad[100];

u32 msgProdIdx;
u32 msgConsIdx;
u32 msgNumEntriesLog2;
} __packed;

/*
* Request descriptor.
*
* sizeof(RingReqDesc) = 128
*
* - context: is a unique identifier of a command. It could normally be any
* 64bit value, however we currently store it in the serialNumber variable
* of struct SCSI_Command, so we have the following restrictions due to the
* way this field is handled in the vmkernel storage stack:
* * this value can't be 0,
* * the upper 32bit need to be 0 since serialNumber is as a u32.
* Currently tracked as PR 292060.
* - dataLen: contains the total number of bytes that need to be transferred.
* - dataAddr:
* * if PVSCSI_FLAG_CMD_WITH_SG_LIST is set: dataAddr is the PA of the first
* s/g table segment, each s/g segment is entirely contained on a single
* page of physical memory,
* * if PVSCSI_FLAG_CMD_WITH_SG_LIST is NOT set, then dataAddr is the PA of
* the buffer used for the DMA transfer,
* - flags:
* * PVSCSI_FLAG_CMD_WITH_SG_LIST: see dataAddr above,
* * PVSCSI_FLAG_CMD_DIR_NONE: no DMA involved,
* * PVSCSI_FLAG_CMD_DIR_TOHOST: transfer from device to main memory,
* * PVSCSI_FLAG_CMD_DIR_TODEVICE: transfer from main memory to device,
* * PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB: reserved to handle CDBs larger than
* 16bytes. To be specified.
* - vcpuHint: vcpuId of the processor that will be most likely waiting for the
* completion of the i/o. For guest OSes that use lowest priority message
* delivery mode (such as windows), we use this "hint" to deliver the
* completion action to the proper vcpu. For now, we can use the vcpuId of
* the processor that initiated the i/o as a likely candidate for the vcpu
* that will be waiting for the completion..
* - bus should be 0: we currently only support bus 0 for now.
* - unused should be zero'd.
*/

#define PVSCSI_FLAG_CMD_WITH_SG_LIST (1 << 0)
#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB (1 << 1)
#define PVSCSI_FLAG_CMD_DIR_NONE (1 << 2)
#define PVSCSI_FLAG_CMD_DIR_TOHOST (1 << 3)
#define PVSCSI_FLAG_CMD_DIR_TODEVICE (1 << 4)

struct PVSCSIRingReqDesc {
u64 context;
u64 dataAddr;
u64 dataLen;
u64 senseAddr;
u32 senseLen;
u32 flags;
u8 cdb[16];
u8 cdbLen;
u8 lun[8];
u8 tag;
u8 bus;
u8 target;
u8 vcpuHint;
u8 unused[59];
} __packed;

/*
* Scatter-gather list management.
*
* As described above, when PVSCSI_FLAG_CMD_WITH_SG_LIST is set in the
* RingReqDesc.flags, then RingReqDesc.dataAddr is the PA of the first s/g
* table segment.
*
* - each segment of the s/g table contain a succession of struct
* PVSCSISGElement.
* - each segment is entirely contained on a single physical page of memory.
* - a "chain" s/g element has the flag PVSCSI_SGE_FLAG_CHAIN_ELEMENT set in
* PVSCSISGElement.flags and in this case:
* * addr is the PA of the next s/g segment,
* * length is undefined, assumed to be 0.
*/

struct PVSCSISGElement {
u64 addr;
u32 length;
u32 flags;
} __packed;

/*
* Completion descriptor.
*
* sizeof(RingCmpDesc) = 32
*
* - context: identifier of the command. The same thing that was specified
* under "context" as part of struct RingReqDesc at initiation time,
* - dataLen: number of bytes transferred for the actual i/o operation,
* - senseLen: number of bytes written into the sense buffer,
* - hostStatus: adapter status,
* - scsiStatus: device status,
* - _pad should be zero.
*/

struct PVSCSIRingCmpDesc {
u64 context;
u64 dataLen;
u32 senseLen;
u16 hostStatus;
u16 scsiStatus;
u32 _pad[2];
} __packed;

struct PVSCSIConfigPageHeader {
u32 pageNum;
u16 numDwords;
u16 hostStatus;
u16 scsiStatus;
u16 reserved[3];
} __packed;

struct PVSCSIConfigPageController {
struct PVSCSIConfigPageHeader header;
u64 nodeWWN; /* Device name as defined in the SAS spec. */
u16 manufacturer[64];
u16 serialNumber[64];
u16 opromVersion[32];
u16 hwVersion[32];
u16 firmwareVersion[32];
u32 numPhys;
u8 useConsecutivePhyWWNs;
u8 reserved[3];
} __packed;

/*
* Interrupt status / IRQ bits.
*/

#define PVSCSI_INTR_CMPL_0 (1 << 0)
#define PVSCSI_INTR_CMPL_1 (1 << 1)
#define PVSCSI_INTR_CMPL_MASK MASK(2)

#define PVSCSI_INTR_MSG_0 (1 << 2)
#define PVSCSI_INTR_MSG_1 (1 << 3)
#define PVSCSI_INTR_MSG_MASK (MASK(2) << 2)

#define PVSCSI_INTR_ALL_SUPPORTED MASK(4)

/*
* Number of MSI-X vectors supported.
*/
#define PVSCSI_MAX_INTRS 24

/*
* Enumeration of supported MSI-X vectors
*/
#define PVSCSI_VECTOR_COMPLETION 0

/*
* Misc constants for the rings.
*/

#define PVSCSI_MAX_NUM_PAGES_REQ_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
#define PVSCSI_MAX_NUM_PAGES_CMP_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
#define PVSCSI_MAX_NUM_PAGES_MSG_RING PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES

#define PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE \
(PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc))

#define PVSCSI_MAX_REQ_QUEUE_DEPTH \
(PVSCSI_MAX_NUM_PAGES_REQ_RING * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE)

#define PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES 1
#define PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES 1
#define PVSCSI_MEM_SPACE_MISC_NUM_PAGES 2
#define PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES 2
#define PVSCSI_MEM_SPACE_MSIX_NUM_PAGES 2

enum PVSCSIMemSpace {
PVSCSI_MEM_SPACE_COMMAND_PAGE = 0,
PVSCSI_MEM_SPACE_INTR_STATUS_PAGE = 1,
PVSCSI_MEM_SPACE_MISC_PAGE = 2,
PVSCSI_MEM_SPACE_KICK_IO_PAGE = 4,
PVSCSI_MEM_SPACE_MSIX_TABLE_PAGE = 6,
PVSCSI_MEM_SPACE_MSIX_PBA_PAGE = 7,
};

#define PVSCSI_MEM_SPACE_NUM_PAGES \
(PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES + \
PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES + \
PVSCSI_MEM_SPACE_MISC_NUM_PAGES + \
PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES + \
PVSCSI_MEM_SPACE_MSIX_NUM_PAGES)

#define PVSCSI_MEM_SPACE_SIZE (PVSCSI_MEM_SPACE_NUM_PAGES * PAGE_SIZE)

#endif /* _VMW_PVSCSI_H_ */
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