annotate usr/src/uts/sun4v/sys/vdc.h @ 5658:73d21dd02285

FWARC 2007/672 VIO vDisk Protocol Updates 6437722 vDisk should support USCSICMD ioctl 6437772 vDisk should support mhd (multihost disk control operations) 6621222 need a tunable to export volumes as single slice disks
author achartre
date Sun, 09 Dec 2007 18:06:41 -0800
parents e9a7403eebeb
children 4c514db6bfb0
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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License (the "License").
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6 * You may not use this file except in compliance with the License.
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7 *
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8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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9 * or http://www.opensolaris.org/os/licensing.
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10 * See the License for the specific language governing permissions
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11 * and limitations under the License.
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12 *
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13 * When distributing Covered Code, include this CDDL HEADER in each
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14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 * If applicable, add the following below this CDDL HEADER, with the
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16 * fields enclosed by brackets "[]" replaced with your own identifying
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17 * information: Portions Copyright [yyyy] [name of copyright owner]
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18 *
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19 * CDDL HEADER END
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20 */
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21
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22 /*
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23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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24 * Use is subject to license terms.
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25 */
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26
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27 #ifndef _VDC_H
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28 #define _VDC_H
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29
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30 #pragma ident "%Z%%M% %I% %E% SMI"
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31
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32 /*
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33 * Virtual disk client implementation definitions
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34 */
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35
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36 #include <sys/sysmacros.h>
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37 #include <sys/note.h>
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38
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39 #include <sys/ldc.h>
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40 #include <sys/vio_mailbox.h>
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41 #include <sys/vdsk_mailbox.h>
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42 #include <sys/vdsk_common.h>
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43
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44 #ifdef __cplusplus
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45 extern "C" {
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46 #endif
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47
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48 #define VDC_DRIVER_NAME "vdc"
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49
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50 /*
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51 * Bit-field values to indicate if parts of the vdc driver are initialised.
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52 */
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53 #define VDC_SOFT_STATE 0x0001
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54 #define VDC_LOCKS 0x0002
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55 #define VDC_MINOR 0x0004
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56 #define VDC_THREAD 0x0008
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57 #define VDC_LDC 0x0010
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58 #define VDC_LDC_INIT 0x0020
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59 #define VDC_LDC_CB 0x0040
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60 #define VDC_LDC_OPEN 0x0080
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61 #define VDC_DRING_INIT 0x0100 /* The DRing was created */
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62 #define VDC_DRING_BOUND 0x0200 /* The DRing was bound to an LDC channel */
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63 #define VDC_DRING_LOCAL 0x0400 /* The local private DRing was allocated */
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64 #define VDC_DRING_ENTRY 0x0800 /* At least one DRing entry was initialised */
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65 #define VDC_DRING (VDC_DRING_INIT | VDC_DRING_BOUND | \
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66 VDC_DRING_LOCAL | VDC_DRING_ENTRY)
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67 #define VDC_HANDSHAKE 0x1000 /* Indicates if a handshake is in progress */
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68 #define VDC_HANDSHAKE_STOP 0x2000 /* stop further handshakes */
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69
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70 /*
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71 * Definitions of strings to be used to create device node properties.
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72 * (vdc uses the capitalised versions of these properties as they are 64-bit)
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73 */
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74 #define VDC_NBLOCKS_PROP_NAME "Nblocks"
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75 #define VDC_SIZE_PROP_NAME "Size"
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76
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77 /*
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78 * Definitions of MD nodes/properties.
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79 */
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80 #define VDC_MD_CHAN_NAME "channel-endpoint"
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81 #define VDC_MD_VDEV_NAME "virtual-device"
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82 #define VDC_MD_PORT_NAME "virtual-device-port"
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83 #define VDC_MD_DISK_NAME "disk"
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84 #define VDC_MD_CFG_HDL "cfg-handle"
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85 #define VDC_MD_TIMEOUT "vdc-timeout"
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86 #define VDC_MD_ID "id"
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87
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88 /*
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89 * Definition of actions to be carried out when processing the sequence ID
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90 * of a message received from the vDisk server. The function verifying the
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91 * sequence number checks the 'seq_num_xxx' fields in the soft state and
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92 * returns whether the message should be processed (VDC_SEQ_NUM_TODO) or
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93 * whether it was it was previously processed (VDC_SEQ_NUM_SKIP).
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94 */
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95 #define VDC_SEQ_NUM_INVALID -1 /* Error */
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96 #define VDC_SEQ_NUM_SKIP 0 /* Request already processed */
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97 #define VDC_SEQ_NUM_TODO 1 /* Request needs processing */
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98
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99 /*
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100 * Macros to get UNIT and PART number
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101 */
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102 #define VDCUNIT_SHIFT 3
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103 #define VDCPART_MASK 7
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104
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105 #define VDCUNIT(dev) (getminor((dev)) >> VDCUNIT_SHIFT)
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106 #define VDCPART(dev) (getminor((dev)) & VDCPART_MASK)
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107
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108 /*
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109 * Scheme to store the instance number and the slice number in the minor number.
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110 * (NOTE: Uses the same format and definitions as the sd(7D) driver)
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111 */
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112 #define VD_MAKE_DEV(instance, minor) ((instance << VDCUNIT_SHIFT) | minor)
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113
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114 /*
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115 * variables controlling how long to wait before timing out and how many
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116 * retries to attempt before giving up when communicating with vds.
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117 *
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118 * These values need to be sufficiently large so that a guest can survive
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119 * the reboot of the service domain.
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120 */
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121 #define VDC_RETRIES 10
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122
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123 #define VDC_USEC_TIMEOUT_MIN (30 * MICROSEC) /* 30 sec */
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124
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125 /*
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126 * This macro returns the number of Hz that the vdc driver should wait before
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127 * a timeout is triggered. The 'timeout' parameter specifiecs the wait
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128 * time in Hz. The 'mul' parameter allows for a multiplier to be
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129 * specified allowing for a backoff to be implemented (e.g. using the
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130 * retry number as a multiplier) where the wait time will get longer if
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131 * there is no response on the previous retry.
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132 */
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133 #define VD_GET_TIMEOUT_HZ(timeout, mul) \
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134 (ddi_get_lbolt() + ((timeout) * MAX(1, (mul))))
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135
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136 /*
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137 * Macros to manipulate Descriptor Ring variables in the soft state
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138 * structure.
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139 */
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140 #define VDC_GET_NEXT_REQ_ID(vdc) ((vdc)->req_id++)
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141
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142 #define VDC_GET_DRING_ENTRY_PTR(vdc, idx) \
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143 (vd_dring_entry_t *)(uintptr_t)((vdc)->dring_mem_info.vaddr + \
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144 (idx * (vdc)->dring_entry_size))
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145
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146 #define VDC_MARK_DRING_ENTRY_FREE(vdc, idx) \
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147 { \
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148 vd_dring_entry_t *dep = NULL; \
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149 ASSERT(vdc != NULL); \
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150 ASSERT(idx < vdc->dring_len); \
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151 ASSERT(vdc->dring_mem_info.vaddr != NULL); \
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152 dep = (vd_dring_entry_t *)(uintptr_t) \
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153 (vdc->dring_mem_info.vaddr + \
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154 (idx * vdc->dring_entry_size)); \
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155 ASSERT(dep != NULL); \
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156 dep->hdr.dstate = VIO_DESC_FREE; \
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157 }
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158
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159 /* Initialise the Session ID and Sequence Num in the DRing msg */
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160 #define VDC_INIT_DRING_DATA_MSG_IDS(dmsg, vdc) \
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161 ASSERT(vdc != NULL); \
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162 dmsg.tag.vio_sid = vdc->session_id; \
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163 dmsg.seq_num = vdc->seq_num;
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164
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165 /*
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166 * The states that the read thread can be in.
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167 */
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168 typedef enum vdc_rd_state {
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169 VDC_READ_IDLE, /* idling - conn is not up */
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170 VDC_READ_WAITING, /* waiting for data */
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171 VDC_READ_PENDING, /* pending data avail for read */
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172 VDC_READ_RESET /* channel was reset - stop reads */
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173 } vdc_rd_state_t;
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174
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175 /*
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176 * The states that the vdc-vds connection can be in.
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177 */
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178 typedef enum vdc_state {
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179 VDC_STATE_INIT, /* device is initialized */
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180 VDC_STATE_INIT_WAITING, /* waiting for ldc connection */
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181 VDC_STATE_NEGOTIATE, /* doing handshake negotiation */
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182 VDC_STATE_HANDLE_PENDING, /* handle requests in backup dring */
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183 VDC_STATE_RUNNING, /* running and accepting requests */
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184 VDC_STATE_DETACH, /* detaching */
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185 VDC_STATE_RESETTING /* resetting connection with vds */
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186 } vdc_state_t;
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187
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188 /*
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189 * The states that the vdc instance can be in.
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190 */
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191 typedef enum vdc_lc_state {
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192 VDC_LC_ATTACHING, /* driver is attaching */
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193 VDC_LC_ONLINE, /* driver is attached and online */
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194 VDC_LC_DETACHING /* driver is detaching */
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195 } vdc_lc_state_t;
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196
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197 /*
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198 * Local Descriptor Ring entry
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199 *
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200 * vdc creates a Local (private) descriptor ring the same size as the
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201 * public descriptor ring it exports to vds.
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202 */
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203
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204 typedef enum {
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205 VIO_read_dir, /* read data from server */
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206 VIO_write_dir, /* write data to server */
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207 VIO_both_dir /* transfer both in and out in same buffer */
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208 } vio_desc_direction_t;
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209
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210 typedef enum {
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211 CB_STRATEGY, /* non-blocking strategy call */
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212 CB_SYNC /* synchronous operation */
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213 } vio_cb_type_t;
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214
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215 typedef struct vdc_local_desc {
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216 boolean_t is_free; /* local state - inuse or not */
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217
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218 int operation; /* VD_OP_xxx to be performed */
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219 caddr_t addr; /* addr passed in by consumer */
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220 int slice;
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221 diskaddr_t offset; /* disk offset */
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222 size_t nbytes;
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223 vio_cb_type_t cb_type; /* operation type blk/nonblk */
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224 void *cb_arg; /* buf passed to strategy() */
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225 vio_desc_direction_t dir; /* direction of transfer */
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226
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227 caddr_t align_addr; /* used if addr non-aligned */
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228 ldc_mem_handle_t desc_mhdl; /* Mem handle of buf */
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229 vd_dring_entry_t *dep; /* public Dring Entry Pointer */
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230
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231 } vdc_local_desc_t;
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232
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233 /*
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234 * I/O queue used by failfast
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235 */
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236 typedef struct vdc_io {
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237 struct vdc_io *vio_next; /* next pending I/O in the queue */
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238 struct buf *vio_buf; /* buf for CB_STRATEGY I/O */
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239 clock_t vio_qtime; /* time the I/O was queued */
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240 } vdc_io_t;
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241
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242 /*
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243 * vdc soft state structure
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244 */
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245 typedef struct vdc {
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246
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247 kmutex_t lock; /* protects next 2 sections of vars */
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248 kcondvar_t running_cv; /* signal when upper layers can send */
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249 kcondvar_t initwait_cv; /* signal when ldc conn is up */
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250 kcondvar_t dring_free_cv; /* signal when desc is avail */
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251 kcondvar_t membind_cv; /* signal when mem can be bound */
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252 boolean_t self_reset;
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253
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254 int initialized; /* keeps track of what's init'ed */
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255 vdc_lc_state_t lifecycle; /* Current state of the vdc instance */
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256
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257 int hshake_cnt; /* number of failed handshakes */
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258 uint8_t open[OTYPCNT]; /* mask of opened slices */
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259 uint8_t open_excl; /* mask of exclusively opened slices */
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260 ulong_t open_lyr[V_NUMPAR]; /* number of layered opens */
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261 int dkio_flush_pending; /* # outstanding DKIO flushes */
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262 int validate_pending; /* # outstanding validate request */
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263 vd_disk_label_t vdisk_label; /* label type of device/disk imported */
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264 struct vtoc *vtoc; /* structure to store VTOC data */
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265 struct dk_geom *geom; /* structure to store geometry data */
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266
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267 kthread_t *msg_proc_thr; /* main msg processing thread */
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268
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269 kmutex_t read_lock; /* lock to protect read */
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270 kcondvar_t read_cv; /* cv to wait for READ events */
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271 vdc_rd_state_t read_state; /* current read state */
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272
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273 uint32_t sync_op_cnt; /* num of active sync operations */
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274 boolean_t sync_op_pending; /* sync operation is pending */
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275 boolean_t sync_op_blocked; /* blocked waiting to do sync op */
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276 uint32_t sync_op_status; /* status of sync operation */
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277 kcondvar_t sync_pending_cv; /* cv wait for sync op to finish */
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278 kcondvar_t sync_blocked_cv; /* cv wait for other syncs to finish */
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279
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280 uint64_t session_id; /* common ID sent with all messages */
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281 uint64_t seq_num; /* most recent sequence num generated */
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282 uint64_t seq_num_reply; /* Last seq num ACK/NACK'ed by vds */
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283 uint64_t req_id; /* Most recent Request ID generated */
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284 uint64_t req_id_proc; /* Last request ID processed by vdc */
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285 vdc_state_t state; /* Current disk client-server state */
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286
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287 dev_info_t *dip; /* device info pointer */
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288 int instance; /* driver instance number */
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289
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290 vio_ver_t ver; /* version number agreed with server */
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291 vd_disk_type_t vdisk_type; /* type of device/disk being imported */
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292 uint32_t vdisk_media; /* physical media type of vDisk */
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293 uint64_t vdisk_size; /* device size in blocks */
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294 uint64_t max_xfer_sz; /* maximum block size of a descriptor */
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295 uint64_t block_size; /* device block size used */
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296 uint64_t operations; /* bitmask of ops. server supports */
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297 struct dk_cinfo *cinfo; /* structure to store DKIOCINFO data */
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298 struct dk_minfo *minfo; /* structure for DKIOCGMEDIAINFO data */
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299 ddi_devid_t devid; /* device id */
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300 uint64_t ctimeout; /* connection timeout in seconds */
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301 boolean_t ctimeout_reached; /* connection timeout has expired */
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302
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303 /*
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304 * The ownership fields are protected by the lock mutex. The
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305 * ownership_lock mutex is used to serialize ownership operations;
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306 * it should be acquired before the lock mutex.
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307 */
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308 kmutex_t ownership_lock; /* serialize ownership ops */
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309 int ownership; /* ownership status flags */
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310 kthread_t *ownership_thread; /* ownership thread */
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311 kcondvar_t ownership_cv; /* cv for ownership update */
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312
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313 /*
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314 * The failfast fields are protected by the lock mutex.
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315 */
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316 kthread_t *failfast_thread; /* failfast thread */
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317 clock_t failfast_interval; /* interval in microsecs */
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318 kcondvar_t failfast_cv; /* cv for failfast update */
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319 kcondvar_t failfast_io_cv; /* cv wait for I/O to finish */
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320 vdc_io_t *failfast_io_queue; /* failfast io queue */
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321
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322 ldc_mem_info_t dring_mem_info; /* dring information */
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323 uint_t dring_curr_idx; /* current index */
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324 uint32_t dring_len; /* dring length */
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325 uint32_t dring_max_cookies; /* dring max cookies */
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326 uint32_t dring_cookie_count; /* num cookies */
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327 uint32_t dring_entry_size; /* descriptor size */
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328 ldc_mem_cookie_t *dring_cookie; /* dring cookies */
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329 uint64_t dring_ident; /* dring ident */
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330
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331 uint64_t threads_pending; /* num of threads */
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332
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333 vdc_local_desc_t *local_dring; /* local dring */
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334 vdc_local_desc_t *local_dring_backup; /* local dring backup */
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335 int local_dring_backup_tail; /* backup dring tail */
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336 int local_dring_backup_len; /* backup dring len */
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337
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338 uint64_t ldc_id; /* LDC channel id */
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339 ldc_status_t ldc_state; /* LDC channel state */
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340 ldc_handle_t ldc_handle; /* LDC handle */
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341 ldc_dring_handle_t ldc_dring_hdl; /* LDC dring handle */
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342 } vdc_t;
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343
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344 /*
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345 * Ownership status flags
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346 */
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347 #define VDC_OWNERSHIP_NONE 0x00 /* no ownership wanted */
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348 #define VDC_OWNERSHIP_WANTED 0x01 /* ownership is wanted */
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349 #define VDC_OWNERSHIP_GRANTED 0x02 /* ownership has been granted */
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350 #define VDC_OWNERSHIP_RESET 0x04 /* ownership has been reset */
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351
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352 /*
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353 * Reservation conflict panic message
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354 */
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355 #define VDC_RESV_CONFLICT_FMT_STR "Reservation Conflict\nDisk: "
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356 #define VDC_RESV_CONFLICT_FMT_LEN (sizeof (VDC_RESV_CONFLICT_FMT_STR))
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357
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358 /*
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359 * Debugging macros
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360 */
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361 #ifdef DEBUG
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362 extern int vdc_msglevel;
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363 extern uint64_t vdc_matchinst;
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364
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365 #define DMSG(_vdc, err_level, format, ...) \
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366 do { \
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367 if (vdc_msglevel > err_level && \
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368 (vdc_matchinst & (1ull << (_vdc)->instance))) \
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369 cmn_err(CE_CONT, "?[%d,t@%p] %s: "format, \
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370 (_vdc)->instance, (void *)curthread, \
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371 __func__, __VA_ARGS__); \
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372 _NOTE(CONSTANTCONDITION) \
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373 } while (0);
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374
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375 #define DMSGX(err_level, format, ...) \
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376 do { \
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377 if (vdc_msglevel > err_level) \
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378 cmn_err(CE_CONT, "?%s: "format, __func__, __VA_ARGS__);\
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379 _NOTE(CONSTANTCONDITION) \
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380 } while (0);
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381
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382 #define VDC_DUMP_DRING_MSG(dmsgp) \
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383 DMSGX(0, "sq:%lu start:%d end:%d ident:%lu\n", \
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384 dmsgp->seq_num, dmsgp->start_idx, \
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385 dmsgp->end_idx, dmsgp->dring_ident);
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386
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387 #else /* !DEBUG */
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388 #define DMSG(err_level, ...)
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389 #define DMSGX(err_level, format, ...)
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390 #define VDC_DUMP_DRING_MSG(dmsgp)
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391
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392 #endif /* !DEBUG */
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393
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394 #ifdef __cplusplus
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395 }
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396 #endif
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397
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398 #endif /* _VDC_H */