398 lines
12 KiB
C
398 lines
12 KiB
C
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/*
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* VMware PVSCSI header file
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*
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* Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License and no later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained by: Alok N Kataria <akataria@vmware.com>
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*
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*/
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#ifndef _VMW_PVSCSI_H_
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#define _VMW_PVSCSI_H_
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#include <linux/types.h>
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#define PVSCSI_DRIVER_VERSION_STRING "1.0.1.0-k"
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#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128
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#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */
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#define PCI_VENDOR_ID_VMWARE 0x15AD
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#define PCI_DEVICE_ID_VMWARE_PVSCSI 0x07C0
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/*
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* host adapter status/error codes
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*/
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enum HostBusAdapterStatus {
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BTSTAT_SUCCESS = 0x00, /* CCB complete normally with no errors */
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BTSTAT_LINKED_COMMAND_COMPLETED = 0x0a,
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BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG = 0x0b,
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BTSTAT_DATA_UNDERRUN = 0x0c,
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BTSTAT_SELTIMEO = 0x11, /* SCSI selection timeout */
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BTSTAT_DATARUN = 0x12, /* data overrun/underrun */
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BTSTAT_BUSFREE = 0x13, /* unexpected bus free */
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BTSTAT_INVPHASE = 0x14, /* invalid bus phase or sequence requested by target */
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BTSTAT_LUNMISMATCH = 0x17, /* linked CCB has different LUN from first CCB */
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BTSTAT_SENSFAILED = 0x1b, /* auto request sense failed */
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BTSTAT_TAGREJECT = 0x1c, /* SCSI II tagged queueing message rejected by target */
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BTSTAT_BADMSG = 0x1d, /* unsupported message received by the host adapter */
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BTSTAT_HAHARDWARE = 0x20, /* host adapter hardware failed */
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BTSTAT_NORESPONSE = 0x21, /* target did not respond to SCSI ATN, sent a SCSI RST */
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BTSTAT_SENTRST = 0x22, /* host adapter asserted a SCSI RST */
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BTSTAT_RECVRST = 0x23, /* other SCSI devices asserted a SCSI RST */
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BTSTAT_DISCONNECT = 0x24, /* target device reconnected improperly (w/o tag) */
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BTSTAT_BUSRESET = 0x25, /* host adapter issued BUS device reset */
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BTSTAT_ABORTQUEUE = 0x26, /* abort queue generated */
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BTSTAT_HASOFTWARE = 0x27, /* host adapter software error */
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BTSTAT_HATIMEOUT = 0x30, /* host adapter hardware timeout error */
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BTSTAT_SCSIPARITY = 0x34, /* SCSI parity error detected */
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};
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/*
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* Register offsets.
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*
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* These registers are accessible both via i/o space and mm i/o.
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*/
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enum PVSCSIRegOffset {
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PVSCSI_REG_OFFSET_COMMAND = 0x0,
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PVSCSI_REG_OFFSET_COMMAND_DATA = 0x4,
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PVSCSI_REG_OFFSET_COMMAND_STATUS = 0x8,
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PVSCSI_REG_OFFSET_LAST_STS_0 = 0x100,
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PVSCSI_REG_OFFSET_LAST_STS_1 = 0x104,
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PVSCSI_REG_OFFSET_LAST_STS_2 = 0x108,
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PVSCSI_REG_OFFSET_LAST_STS_3 = 0x10c,
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PVSCSI_REG_OFFSET_INTR_STATUS = 0x100c,
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PVSCSI_REG_OFFSET_INTR_MASK = 0x2010,
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PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014,
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PVSCSI_REG_OFFSET_DEBUG = 0x3018,
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PVSCSI_REG_OFFSET_KICK_RW_IO = 0x4018,
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};
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/*
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* Virtual h/w commands.
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*/
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enum PVSCSICommands {
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PVSCSI_CMD_FIRST = 0, /* has to be first */
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PVSCSI_CMD_ADAPTER_RESET = 1,
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PVSCSI_CMD_ISSUE_SCSI = 2,
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PVSCSI_CMD_SETUP_RINGS = 3,
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PVSCSI_CMD_RESET_BUS = 4,
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PVSCSI_CMD_RESET_DEVICE = 5,
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PVSCSI_CMD_ABORT_CMD = 6,
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PVSCSI_CMD_CONFIG = 7,
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PVSCSI_CMD_SETUP_MSG_RING = 8,
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PVSCSI_CMD_DEVICE_UNPLUG = 9,
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PVSCSI_CMD_LAST = 10 /* has to be last */
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};
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/*
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* Command descriptor for PVSCSI_CMD_RESET_DEVICE --
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*/
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struct PVSCSICmdDescResetDevice {
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u32 target;
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u8 lun[8];
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} __packed;
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/*
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* Command descriptor for PVSCSI_CMD_ABORT_CMD --
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*
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* - currently does not support specifying the LUN.
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* - _pad should be 0.
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*/
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struct PVSCSICmdDescAbortCmd {
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u64 context;
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u32 target;
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u32 _pad;
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} __packed;
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/*
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* Command descriptor for PVSCSI_CMD_SETUP_RINGS --
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*
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* Notes:
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* - reqRingNumPages and cmpRingNumPages need to be power of two.
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* - reqRingNumPages and cmpRingNumPages need to be different from 0,
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* - reqRingNumPages and cmpRingNumPages need to be inferior to
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* PVSCSI_SETUP_RINGS_MAX_NUM_PAGES.
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*/
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#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES 32
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struct PVSCSICmdDescSetupRings {
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u32 reqRingNumPages;
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u32 cmpRingNumPages;
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u64 ringsStatePPN;
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u64 reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
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u64 cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
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} __packed;
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/*
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* Command descriptor for PVSCSI_CMD_SETUP_MSG_RING --
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*
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* Notes:
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* - this command was not supported in the initial revision of the h/w
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* interface. Before using it, you need to check that it is supported by
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* writing PVSCSI_CMD_SETUP_MSG_RING to the 'command' register, then
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* immediately after read the 'command status' register:
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* * a value of -1 means that the cmd is NOT supported,
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* * a value != -1 means that the cmd IS supported.
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* If it's supported the 'command status' register should return:
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* sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(u32).
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* - this command should be issued _after_ the usual SETUP_RINGS so that the
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* RingsState page is already setup. If not, the command is a nop.
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* - numPages needs to be a power of two,
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* - numPages needs to be different from 0,
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* - _pad should be zero.
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*/
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#define PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES 16
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struct PVSCSICmdDescSetupMsgRing {
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u32 numPages;
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u32 _pad;
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u64 ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
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} __packed;
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enum PVSCSIMsgType {
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PVSCSI_MSG_DEV_ADDED = 0,
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PVSCSI_MSG_DEV_REMOVED = 1,
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PVSCSI_MSG_LAST = 2,
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};
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/*
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* Msg descriptor.
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*
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* sizeof(struct PVSCSIRingMsgDesc) == 128.
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*
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* - type is of type enum PVSCSIMsgType.
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* - the content of args depend on the type of event being delivered.
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*/
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struct PVSCSIRingMsgDesc {
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u32 type;
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u32 args[31];
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} __packed;
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struct PVSCSIMsgDescDevStatusChanged {
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u32 type; /* PVSCSI_MSG_DEV _ADDED / _REMOVED */
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u32 bus;
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u32 target;
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u8 lun[8];
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u32 pad[27];
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} __packed;
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/*
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* Rings state.
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*
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* - the fields:
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* . msgProdIdx,
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* . msgConsIdx,
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* . msgNumEntriesLog2,
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* .. are only used once the SETUP_MSG_RING cmd has been issued.
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* - '_pad' helps to ensure that the msg related fields are on their own
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* cache-line.
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*/
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struct PVSCSIRingsState {
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u32 reqProdIdx;
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u32 reqConsIdx;
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u32 reqNumEntriesLog2;
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u32 cmpProdIdx;
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u32 cmpConsIdx;
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u32 cmpNumEntriesLog2;
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u8 _pad[104];
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u32 msgProdIdx;
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u32 msgConsIdx;
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u32 msgNumEntriesLog2;
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} __packed;
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/*
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* Request descriptor.
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*
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* sizeof(RingReqDesc) = 128
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*
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* - context: is a unique identifier of a command. It could normally be any
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* 64bit value, however we currently store it in the serialNumber variable
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* of struct SCSI_Command, so we have the following restrictions due to the
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* way this field is handled in the vmkernel storage stack:
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* * this value can't be 0,
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* * the upper 32bit need to be 0 since serialNumber is as a u32.
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* Currently tracked as PR 292060.
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* - dataLen: contains the total number of bytes that need to be transferred.
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* - dataAddr:
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* * if PVSCSI_FLAG_CMD_WITH_SG_LIST is set: dataAddr is the PA of the first
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* s/g table segment, each s/g segment is entirely contained on a single
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* page of physical memory,
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* * if PVSCSI_FLAG_CMD_WITH_SG_LIST is NOT set, then dataAddr is the PA of
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* the buffer used for the DMA transfer,
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* - flags:
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* * PVSCSI_FLAG_CMD_WITH_SG_LIST: see dataAddr above,
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* * PVSCSI_FLAG_CMD_DIR_NONE: no DMA involved,
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* * PVSCSI_FLAG_CMD_DIR_TOHOST: transfer from device to main memory,
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* * PVSCSI_FLAG_CMD_DIR_TODEVICE: transfer from main memory to device,
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* * PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB: reserved to handle CDBs larger than
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* 16bytes. To be specified.
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* - vcpuHint: vcpuId of the processor that will be most likely waiting for the
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* completion of the i/o. For guest OSes that use lowest priority message
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* delivery mode (such as windows), we use this "hint" to deliver the
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* completion action to the proper vcpu. For now, we can use the vcpuId of
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* the processor that initiated the i/o as a likely candidate for the vcpu
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* that will be waiting for the completion..
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* - bus should be 0: we currently only support bus 0 for now.
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* - unused should be zero'd.
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*/
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#define PVSCSI_FLAG_CMD_WITH_SG_LIST (1 << 0)
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#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB (1 << 1)
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#define PVSCSI_FLAG_CMD_DIR_NONE (1 << 2)
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#define PVSCSI_FLAG_CMD_DIR_TOHOST (1 << 3)
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#define PVSCSI_FLAG_CMD_DIR_TODEVICE (1 << 4)
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struct PVSCSIRingReqDesc {
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u64 context;
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u64 dataAddr;
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u64 dataLen;
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u64 senseAddr;
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u32 senseLen;
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u32 flags;
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u8 cdb[16];
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u8 cdbLen;
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u8 lun[8];
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u8 tag;
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u8 bus;
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u8 target;
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u8 vcpuHint;
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u8 unused[59];
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} __packed;
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/*
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* Scatter-gather list management.
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*
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* As described above, when PVSCSI_FLAG_CMD_WITH_SG_LIST is set in the
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* RingReqDesc.flags, then RingReqDesc.dataAddr is the PA of the first s/g
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* table segment.
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*
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* - each segment of the s/g table contain a succession of struct
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* PVSCSISGElement.
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* - each segment is entirely contained on a single physical page of memory.
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* - a "chain" s/g element has the flag PVSCSI_SGE_FLAG_CHAIN_ELEMENT set in
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* PVSCSISGElement.flags and in this case:
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* * addr is the PA of the next s/g segment,
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* * length is undefined, assumed to be 0.
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*/
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struct PVSCSISGElement {
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u64 addr;
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u32 length;
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u32 flags;
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} __packed;
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/*
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* Completion descriptor.
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*
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* sizeof(RingCmpDesc) = 32
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*
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* - context: identifier of the command. The same thing that was specified
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* under "context" as part of struct RingReqDesc at initiation time,
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* - dataLen: number of bytes transferred for the actual i/o operation,
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* - senseLen: number of bytes written into the sense buffer,
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* - hostStatus: adapter status,
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* - scsiStatus: device status,
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* - _pad should be zero.
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*/
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struct PVSCSIRingCmpDesc {
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u64 context;
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u64 dataLen;
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u32 senseLen;
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u16 hostStatus;
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u16 scsiStatus;
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u32 _pad[2];
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} __packed;
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/*
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* Interrupt status / IRQ bits.
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*/
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#define PVSCSI_INTR_CMPL_0 (1 << 0)
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#define PVSCSI_INTR_CMPL_1 (1 << 1)
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#define PVSCSI_INTR_CMPL_MASK MASK(2)
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#define PVSCSI_INTR_MSG_0 (1 << 2)
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#define PVSCSI_INTR_MSG_1 (1 << 3)
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#define PVSCSI_INTR_MSG_MASK (MASK(2) << 2)
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#define PVSCSI_INTR_ALL_SUPPORTED MASK(4)
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/*
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* Number of MSI-X vectors supported.
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*/
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#define PVSCSI_MAX_INTRS 24
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/*
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* Enumeration of supported MSI-X vectors
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*/
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#define PVSCSI_VECTOR_COMPLETION 0
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/*
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* Misc constants for the rings.
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*/
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#define PVSCSI_MAX_NUM_PAGES_REQ_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
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#define PVSCSI_MAX_NUM_PAGES_CMP_RING PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
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#define PVSCSI_MAX_NUM_PAGES_MSG_RING PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES
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#define PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE \
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(PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc))
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#define PVSCSI_MAX_REQ_QUEUE_DEPTH \
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(PVSCSI_MAX_NUM_PAGES_REQ_RING * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE)
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#define PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES 1
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#define PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES 1
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||
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#define PVSCSI_MEM_SPACE_MISC_NUM_PAGES 2
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#define PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES 2
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||
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#define PVSCSI_MEM_SPACE_MSIX_NUM_PAGES 2
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||
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enum PVSCSIMemSpace {
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||
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PVSCSI_MEM_SPACE_COMMAND_PAGE = 0,
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||
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PVSCSI_MEM_SPACE_INTR_STATUS_PAGE = 1,
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PVSCSI_MEM_SPACE_MISC_PAGE = 2,
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PVSCSI_MEM_SPACE_KICK_IO_PAGE = 4,
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||
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PVSCSI_MEM_SPACE_MSIX_TABLE_PAGE = 6,
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||
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PVSCSI_MEM_SPACE_MSIX_PBA_PAGE = 7,
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||
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};
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||
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||
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#define PVSCSI_MEM_SPACE_NUM_PAGES \
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||
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(PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES + \
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||
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PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES + \
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||
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PVSCSI_MEM_SPACE_MISC_NUM_PAGES + \
|
||
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PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES + \
|
||
|
|
PVSCSI_MEM_SPACE_MSIX_NUM_PAGES)
|
||
|
|
|
||
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#define PVSCSI_MEM_SPACE_SIZE (PVSCSI_MEM_SPACE_NUM_PAGES * PAGE_SIZE)
|
||
|
|
|
||
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#endif /* _VMW_PVSCSI_H_ */
|