/*
   * VMware PVSCSI header file
   *
   * Copyright (C) 2008-2009, 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   "1.0.2.0-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_LAST              = 10  /* 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;
  
  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;
  
  	u8	_pad[104];
  
  	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_ */