/*
* 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
#define VMW_PAGE_SIZE (4096)
#define VMW_PAGE_SHIFT (12)
#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */
/*
* 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_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 */
};
/*
* 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 */
};
#define PVSCSI_COMMAND_PROCESSING_SUCCEEDED (0)
#define PVSCSI_COMMAND_PROCESSING_FAILED (-1)
#define PVSCSI_COMMAND_NOT_ENOUGH_DATA (-2)
/*
* Command descriptor for PVSCSI_CMD_RESET_DEVICE --
*/
struct PVSCSICmdDescResetDevice {
uint32_t target;
uint8_t lun[8];
} QEMU_PACKED;
typedef struct PVSCSICmdDescResetDevice PVSCSICmdDescResetDevice;
/*
* Command descriptor for PVSCSI_CMD_ABORT_CMD --
*
* - currently does not support specifying the LUN.
* - pad should be 0.
*/
struct PVSCSICmdDescAbortCmd {
uint64_t context;
uint32_t target;
uint32_t pad;
} QEMU_PACKED;
typedef struct PVSCSICmdDescAbortCmd PVSCSICmdDescAbortCmd;
/*
* 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 {
uint32_t reqRingNumPages;
uint32_t cmpRingNumPages;
uint64_t ringsStatePPN;
uint64_t reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
uint64_t cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
} QEMU_PACKED;
typedef struct PVSCSICmdDescSetupRings PVSCSICmdDescSetupRings;
/*
* 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(uint32_t).
* - 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 {
uint32_t numPages;
uint32_t pad;
uint64_t ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
} QEMU_PACKED;
typedef struct PVSCSICmdDescSetupMsgRing PVSCSICmdDescSetupMsgRing;
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 {
uint32_t type;
uint32_t args[31];
} QEMU_PACKED;
typedef struct PVSCSIRingMsgDesc PVSCSIRingMsgDesc;
struct PVSCSIMsgDescDevStatusChanged {
uint32_t type; /* PVSCSI_MSG_DEV _ADDED / _REMOVED */
uint32_t bus;
uint32_t target;
uint8_t lun[8];
uint32_t pad[27];
} QEMU_PACKED;
typedef struct PVSCSIMsgDescDevStatusChanged PVSCSIMsgDescDevStatusChanged;
/*
* 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 {
uint32_t reqProdIdx;
uint32_t reqConsIdx;
uint32_t reqNumEntriesLog2;
uint32_t cmpProdIdx;
uint32_t cmpConsIdx;
uint32_t cmpNumEntriesLog2;
uint8_t pad[104];
uint32_t msgProdIdx;
uint32_t msgConsIdx;
uint32_t msgNumEntriesLog2;
} QEMU_PACKED;
typedef struct PVSCSIRingsState PVSCSIRingsState;
/*
* 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 uint32_t.
* 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)
#define PVSCSI_KNOWN_FLAGS \
(PVSCSI_FLAG_CMD_WITH_SG_LIST | \
PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB | \
PVSCSI_FLAG_CMD_DIR_NONE | \
PVSCSI_FLAG_CMD_DIR_TOHOST | \
PVSCSI_FLAG_CMD_DIR_TODEVICE)
struct PVSCSIRingReqDesc {
uint64_t context;
uint64_t dataAddr;
uint64_t dataLen;
uint64_t senseAddr;
uint32_t senseLen;
uint32_t flags;
uint8_t cdb[16];
uint8_t cdbLen;
uint8_t lun[8];
uint8_t tag;
uint8_t bus;
uint8_t target;
uint8_t vcpuHint;
uint8_t unused[59];
} QEMU_PACKED;
typedef struct PVSCSIRingReqDesc PVSCSIRingReqDesc;
/*
* 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 {
uint64_t addr;
uint32_t length;
uint32_t flags;
} QEMU_PACKED;
typedef struct PVSCSISGElement PVSCSISGElement;
/*
* 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 {
uint64_t context;
uint64_t dataLen;
uint32_t senseLen;
uint16_t hostStatus;
uint16_t scsiStatus;
uint32_t pad[2];
} QEMU_PACKED;
typedef struct PVSCSIRingCmpDesc PVSCSIRingCmpDesc;
/*
* 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 \
(VMW_PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc))
#define PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE \
(VMW_PAGE_SIZE / sizeof(PVSCSIRingCmpDesc))
#define PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE \
(VMW_PAGE_SIZE / sizeof(PVSCSIRingMsgDesc))
#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 * VMW_PAGE_SIZE)
#endif /* VMW_PVSCSI_H */
