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/types.h> 32 33 #include <err.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <strings.h> 37 38 #include <cam/cam.h> 39 #include <cam/cam_ccb.h> 40 #include <cam/scsi/scsi_all.h> 41 #include <cam/scsi/scsi_pass.h> 42 #include <cam/scsi/scsi_message.h> 43 #include "camlib.h" 44 #include "scsi_wrap.h" 45 46 void * 47 scsi_wrap_get_physical_element_status(struct cam_device *device, int task_attr, int retry_count, 48 int timeout, uint8_t report_type, uint32_t start_element) 49 { 50 uint32_t allocation_length; 51 union ccb *ccb = NULL; 52 struct scsi_get_physical_element_hdr *hdr = NULL; 53 uint32_t dtors; 54 uint32_t reported; 55 56 ccb = cam_getccb(device); 57 if (ccb == NULL) { 58 warnx("Can't allocate ccb"); 59 return (NULL); 60 } 61 62 /* 63 * Do the request up to twice. Once to get the length and once to get 64 * the data. We'll guess that 4096 is enough to almost always long 65 * enough since that's 127 entries and most drives have < 20 heads. If 66 * by chance it's not, then we'll loop once as we'll then know the 67 * proper length. 68 */ 69 allocation_length = MAX(sizeof(*hdr), 4096); 70 again: 71 free(hdr); 72 hdr = calloc(allocation_length, 1); 73 if (hdr == NULL) { 74 warnx("Can't allocate memory for physical element list"); 75 return (NULL); 76 } 77 78 scsi_get_physical_element_status(&ccb->csio, 79 retry_count, 80 NULL, 81 task_attr, 82 (uint8_t *)hdr, 83 allocation_length, 84 report_type, 85 start_element, 86 SSD_FULL_SIZE, 87 timeout); 88 89 /* Disable freezing the device queue */ 90 ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; 91 92 if (cam_send_ccb(device, ccb) < 0) { 93 warn("error sending GET PHYSICAL ELEMENT STATUS command"); 94 goto errout; 95 } 96 97 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 98 cam_error_print(device, ccb, CAM_ESF_ALL, 99 CAM_EPF_ALL, stderr); 100 goto errout; 101 } 102 103 dtors = scsi_4btoul(hdr->num_descriptors); 104 reported = scsi_4btoul(hdr->num_returned); 105 if (dtors != 0 && dtors != reported) { 106 /* 107 * Get all the data... in the future we may need to step through 108 * a long list, but so far all drives I've found fit into one 109 * response. A 4k transfer can do 128 heads and current designs 110 * have 16. 111 */ 112 allocation_length = dtors * sizeof(struct scsi_get_physical_element_descriptor) + 113 sizeof(*hdr); 114 goto again; 115 } 116 cam_freeccb(ccb); 117 return (hdr); 118 errout: 119 cam_freeccb(ccb); 120 free(hdr); 121 return (NULL); 122 } 123 124 void * 125 scsi_wrap_inquiry(struct cam_device *device, uint32_t page, uint32_t length) 126 { 127 union ccb *ccb; 128 uint8_t *buf; 129 130 ccb = cam_getccb(device); 131 132 if (ccb == NULL) 133 return (NULL); 134 135 buf = malloc(length); 136 137 if (buf == NULL) { 138 cam_freeccb(ccb); 139 return (NULL); 140 } 141 142 scsi_inquiry(&ccb->csio, 143 /*retries*/ 0, 144 /*cbfcnp*/ NULL, 145 /* tag_action */ MSG_SIMPLE_Q_TAG, 146 /* inq_buf */ (uint8_t *)buf, 147 /* inq_len */ length, 148 /* evpd */ 1, 149 /* page_code */ page, 150 /* sense_len */ SSD_FULL_SIZE, 151 /* timeout */ 5000); 152 153 /* Disable freezing the device queue */ 154 ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; 155 // ccb->ccb_h.flags |= CAM_PASS_ERR_RECOVER; 156 157 if (cam_send_ccb(device, ccb) < 0) { 158 warn("error sending INQUIRY command"); 159 cam_freeccb(ccb); 160 free(buf); 161 return (NULL); 162 } 163 164 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { 165 free(buf); 166 buf = NULL; 167 } 168 cam_freeccb(ccb); 169 return (buf); 170 } 171 172 struct scsi_vpd_block_device_characteristics * 173 scsi_wrap_vpd_block_device_characteristics(struct cam_device *device) 174 { 175 176 return ((struct scsi_vpd_block_device_characteristics *)scsi_wrap_inquiry( 177 device, SVPD_BDC, sizeof(struct scsi_vpd_block_device_characteristics))); 178 } 179