diff options
Diffstat (limited to 'drivers/scsi/vmw_pvscsi.h')
| -rw-r--r-- | drivers/scsi/vmw_pvscsi.h | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/drivers/scsi/vmw_pvscsi.h b/drivers/scsi/vmw_pvscsi.h new file mode 100644 index 0000000..62e36e7 --- /dev/null +++ b/drivers/scsi/vmw_pvscsi.h @@ -0,0 +1,397 @@ +/* + * 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: Alok N Kataria <akataria@vmware.com> + * + */ + +#ifndef _VMW_PVSCSI_H_ +#define _VMW_PVSCSI_H_ + +#include <linux/types.h> + +#define PVSCSI_DRIVER_VERSION_STRING "1.0.1.0-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_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 */ +}; + +/* + * Command descriptor for PVSCSI_CMD_RESET_DEVICE -- + */ + +struct PVSCSICmdDescResetDevice { + u32 target; + u8 lun[8]; +} __packed; + +/* + * 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; + +/* + * 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_ */ |