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 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 36 #include <err.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <strings.h> 40 41 #include <cam/cam.h> 42 #include <cam/cam_ccb.h> 43 #include <cam/scsi/scsi_all.h> 44 #include <cam/scsi/scsi_pass.h> 45 #include <cam/scsi/scsi_message.h> 46 #include "camlib.h" 47 #include "scsi_wrap.h" 48 49 void * 50 scsi_wrap_get_physical_element_status(struct cam_device *device, int task_attr, int retry_count, 51 int timeout, uint8_t report_type, uint32_t start_element) 52 { 53 uint32_t allocation_length; 54 union ccb *ccb = NULL; 55 struct scsi_get_physical_element_hdr *hdr = NULL; 56 uint32_t dtors; 57 uint32_t reported; 58 59 ccb = cam_getccb(device); 60 if (ccb == NULL) { 61 warnx("Can't allocate ccb"); 62 return (NULL); 63 } 64 65 /* 66 * Do the request up to twice. Once to get the length and once to get 67 * the data. We'll guess that 4096 is enough to almost always long 68 * enough since that's 127 entries and most drives have < 20 heads. If 69 * by chance it's not, then we'll loop once as we'll then know the 70 * proper length. 71 */ 72 allocation_length = MAX(sizeof(*hdr), 4096); 73 again: 74 free(hdr); 75 hdr = calloc(allocation_length, 1); 76 if (hdr == NULL) { 77 warnx("Can't allocate memory for physical element list"); 78 return (NULL); 79 } 80 81 scsi_get_physical_element_status(&ccb->csio, 82 retry_count, 83 NULL, 84 task_attr, 85 (uint8_t *)hdr, 86 allocation_length, 87 report_type, 88 start_element, 89 SSD_FULL_SIZE, 90 timeout); 91 92 /* Disable freezing the device queue */ 93 ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; 94 95 if (cam_send_ccb(device, ccb) < 0) { 96 warn("error sending GET PHYSICAL ELEMENT STATUS command"); 97 goto errout; 98 } 99 100 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 101 cam_error_print(device, ccb, CAM_ESF_ALL, 102 CAM_EPF_ALL, stderr); 103 goto errout; 104 } 105 106 dtors = scsi_4btoul(hdr->num_descriptors); 107 reported = scsi_4btoul(hdr->num_returned); 108 if (dtors != 0 && dtors != reported) { 109 /* 110 * Get all the data... in the future we may need to step through 111 * a long list, but so far all drives I've found fit into one 112 * response. A 4k transfer can do 128 heads and current designs 113 * have 16. 114 */ 115 allocation_length = dtors * sizeof(struct scsi_get_physical_element_descriptor) + 116 sizeof(*hdr); 117 goto again; 118 } 119 cam_freeccb(ccb); 120 return (hdr); 121 errout: 122 cam_freeccb(ccb); 123 free(hdr); 124 return (NULL); 125 } 126 127 void * 128 scsi_wrap_inquiry(struct cam_device *device, uint32_t page, uint32_t length) 129 { 130 union ccb *ccb; 131 uint8_t *buf; 132 133 ccb = cam_getccb(device); 134 135 if (ccb == NULL) 136 return (NULL); 137 138 buf = malloc(length); 139 140 if (buf == NULL) { 141 cam_freeccb(ccb); 142 return (NULL); 143 } 144 145 scsi_inquiry(&ccb->csio, 146 /*retries*/ 0, 147 /*cbfcnp*/ NULL, 148 /* tag_action */ MSG_SIMPLE_Q_TAG, 149 /* inq_buf */ (uint8_t *)buf, 150 /* inq_len */ length, 151 /* evpd */ 1, 152 /* page_code */ page, 153 /* sense_len */ SSD_FULL_SIZE, 154 /* timeout */ 5000); 155 156 /* Disable freezing the device queue */ 157 ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; 158 // ccb->ccb_h.flags |= CAM_PASS_ERR_RECOVER; 159 160 if (cam_send_ccb(device, ccb) < 0) { 161 warn("error sending INQUIRY command"); 162 cam_freeccb(ccb); 163 free(buf); 164 return (NULL); 165 } 166 167 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 168 free(buf); 169 buf = NULL; 170 } 171 cam_freeccb(ccb); 172 return (buf); 173 } 174 175 struct scsi_vpd_block_device_characteristics * 176 scsi_wrap_vpd_block_device_characteristics(struct cam_device *device) 177 { 178 179 return ((struct scsi_vpd_block_device_characteristics *)scsi_wrap_inquiry( 180 device, SVPD_BDC, sizeof(struct scsi_vpd_block_device_characteristics))); 181 } 182