1 /*- 2 * Copyright (c) 2021 Netflix, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 /* 27 * Wrapper functions to make requests and get answers w/o managing the 28 * details. 29 */ 30 31 #include <sys/cdefs.h> 32 #include <sys/types.h> 33 34 #include <err.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <strings.h> 38 39 #include <cam/cam.h> 40 #include <cam/cam_ccb.h> 41 #include <cam/scsi/scsi_all.h> 42 #include <cam/scsi/scsi_pass.h> 43 #include <cam/scsi/scsi_message.h> 44 #include "camlib.h" 45 #include "scsi_wrap.h" 46 47 void * 48 scsi_wrap_get_physical_element_status(struct cam_device *device, int task_attr, int retry_count, 49 int timeout, uint8_t report_type, uint32_t start_element) 50 { 51 uint32_t allocation_length; 52 union ccb *ccb = NULL; 53 struct scsi_get_physical_element_hdr *hdr = NULL; 54 uint32_t dtors; 55 uint32_t reported; 56 57 ccb = cam_getccb(device); 58 if (ccb == NULL) { 59 warnx("Can't allocate ccb"); 60 return (NULL); 61 } 62 63 /* 64 * Do the request up to twice. Once to get the length and once to get 65 * the data. We'll guess that 4096 is enough to almost always long 66 * enough since that's 127 entries and most drives have < 20 heads. If 67 * by chance it's not, then we'll loop once as we'll then know the 68 * proper length. 69 */ 70 allocation_length = MAX(sizeof(*hdr), 4096); 71 again: 72 free(hdr); 73 hdr = calloc(allocation_length, 1); 74 if (hdr == NULL) { 75 warnx("Can't allocate memory for physical element list"); 76 return (NULL); 77 } 78 79 scsi_get_physical_element_status(&ccb->csio, 80 retry_count, 81 NULL, 82 task_attr, 83 (uint8_t *)hdr, 84 allocation_length, 85 report_type, 86 start_element, 87 SSD_FULL_SIZE, 88 timeout); 89 90 /* Disable freezing the device queue */ 91 ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; 92 93 if (cam_send_ccb(device, ccb) < 0) { 94 warn("error sending GET PHYSICAL ELEMENT STATUS command"); 95 goto errout; 96 } 97 98 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 99 cam_error_print(device, ccb, CAM_ESF_ALL, 100 CAM_EPF_ALL, stderr); 101 goto errout; 102 } 103 104 dtors = scsi_4btoul(hdr->num_descriptors); 105 reported = scsi_4btoul(hdr->num_returned); 106 if (dtors != 0 && dtors != reported) { 107 /* 108 * Get all the data... in the future we may need to step through 109 * a long list, but so far all drives I've found fit into one 110 * response. A 4k transfer can do 128 heads and current designs 111 * have 16. 112 */ 113 allocation_length = dtors * sizeof(struct scsi_get_physical_element_descriptor) + 114 sizeof(*hdr); 115 goto again; 116 } 117 cam_freeccb(ccb); 118 return (hdr); 119 errout: 120 cam_freeccb(ccb); 121 free(hdr); 122 return (NULL); 123 } 124 125 void * 126 scsi_wrap_inquiry(struct cam_device *device, uint32_t page, uint32_t length) 127 { 128 union ccb *ccb; 129 uint8_t *buf; 130 131 ccb = cam_getccb(device); 132 133 if (ccb == NULL) 134 return (NULL); 135 136 buf = malloc(length); 137 138 if (buf == NULL) { 139 cam_freeccb(ccb); 140 return (NULL); 141 } 142 143 scsi_inquiry(&ccb->csio, 144 /*retries*/ 0, 145 /*cbfcnp*/ NULL, 146 /* tag_action */ MSG_SIMPLE_Q_TAG, 147 /* inq_buf */ (uint8_t *)buf, 148 /* inq_len */ length, 149 /* evpd */ 1, 150 /* page_code */ page, 151 /* sense_len */ SSD_FULL_SIZE, 152 /* timeout */ 5000); 153 154 /* Disable freezing the device queue */ 155 ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; 156 // ccb->ccb_h.flags |= CAM_PASS_ERR_RECOVER; 157 158 if (cam_send_ccb(device, ccb) < 0) { 159 warn("error sending INQUIRY command"); 160 cam_freeccb(ccb); 161 free(buf); 162 return (NULL); 163 } 164 165 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 166 free(buf); 167 buf = NULL; 168 } 169 cam_freeccb(ccb); 170 return (buf); 171 } 172 173 struct scsi_vpd_block_device_characteristics * 174 scsi_wrap_vpd_block_device_characteristics(struct cam_device *device) 175 { 176 177 return ((struct scsi_vpd_block_device_characteristics *)scsi_wrap_inquiry( 178 device, SVPD_BDC, sizeof(struct scsi_vpd_block_device_characteristics))); 179 } 180