litmus-rt-edfsc.git - LITMUS^RT with the EDF-SC plugin for Real-Time Systems journal paper

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/*
 * 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:


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