diff options
Diffstat (limited to 'lib/libcam/scsi_wrap.c')
| -rw-r--r-- | lib/libcam/scsi_wrap.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/lib/libcam/scsi_wrap.c b/lib/libcam/scsi_wrap.c new file mode 100644 index 000000000000..584f760bcc42 --- /dev/null +++ b/lib/libcam/scsi_wrap.c @@ -0,0 +1,178 @@ +/*- + * Copyright (c) 2021 Netflix, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Wrapper functions to make requests and get answers w/o managing the + * details. + */ + +#include <sys/types.h> + +#include <err.h> +#include <stdio.h> +#include <stdlib.h> +#include <strings.h> + +#include <cam/cam.h> +#include <cam/cam_ccb.h> +#include <cam/scsi/scsi_all.h> +#include <cam/scsi/scsi_pass.h> +#include <cam/scsi/scsi_message.h> +#include "camlib.h" +#include "scsi_wrap.h" + +void * +scsi_wrap_get_physical_element_status(struct cam_device *device, int task_attr, int retry_count, + int timeout, uint8_t report_type, uint32_t start_element) +{ + uint32_t allocation_length; + union ccb *ccb = NULL; + struct scsi_get_physical_element_hdr *hdr = NULL; + uint32_t dtors; + uint32_t reported; + + ccb = cam_getccb(device); + if (ccb == NULL) { + warnx("Can't allocate ccb"); + return (NULL); + } + + /* + * Do the request up to twice. Once to get the length and once to get + * the data. We'll guess that 4096 is enough to almost always long + * enough since that's 127 entries and most drives have < 20 heads. If + * by chance it's not, then we'll loop once as we'll then know the + * proper length. + */ + allocation_length = MAX(sizeof(*hdr), 4096); +again: + free(hdr); + hdr = calloc(allocation_length, 1); + if (hdr == NULL) { + warnx("Can't allocate memory for physical element list"); + return (NULL); + } + + scsi_get_physical_element_status(&ccb->csio, + retry_count, + NULL, + task_attr, + (uint8_t *)hdr, + allocation_length, + report_type, + start_element, + SSD_FULL_SIZE, + timeout); + + /* Disable freezing the device queue */ + ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; + + if (cam_send_ccb(device, ccb) < 0) { + warn("error sending GET PHYSICAL ELEMENT STATUS command"); + goto errout; + } + + if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { + cam_error_print(device, ccb, CAM_ESF_ALL, + CAM_EPF_ALL, stderr); + goto errout; + } + + dtors = scsi_4btoul(hdr->num_descriptors); + reported = scsi_4btoul(hdr->num_returned); + if (dtors != 0 && dtors != reported) { + /* + * Get all the data... in the future we may need to step through + * a long list, but so far all drives I've found fit into one + * response. A 4k transfer can do 128 heads and current designs + * have 16. + */ + allocation_length = dtors * sizeof(struct scsi_get_physical_element_descriptor) + + sizeof(*hdr); + goto again; + } + cam_freeccb(ccb); + return (hdr); +errout: + cam_freeccb(ccb); + free(hdr); + return (NULL); +} + +void * +scsi_wrap_inquiry(struct cam_device *device, uint32_t page, uint32_t length) +{ + union ccb *ccb; + uint8_t *buf; + + ccb = cam_getccb(device); + + if (ccb == NULL) + return (NULL); + + buf = malloc(length); + + if (buf == NULL) { + cam_freeccb(ccb); + return (NULL); + } + + scsi_inquiry(&ccb->csio, + /*retries*/ 0, + /*cbfcnp*/ NULL, + /* tag_action */ MSG_SIMPLE_Q_TAG, + /* inq_buf */ (uint8_t *)buf, + /* inq_len */ length, + /* evpd */ 1, + /* page_code */ page, + /* sense_len */ SSD_FULL_SIZE, + /* timeout */ 5000); + + /* Disable freezing the device queue */ + ccb->ccb_h.flags |= CAM_DEV_QFRZDIS; + // ccb->ccb_h.flags |= CAM_PASS_ERR_RECOVER; + + if (cam_send_ccb(device, ccb) < 0) { + warn("error sending INQUIRY command"); + cam_freeccb(ccb); + free(buf); + return (NULL); + } + + if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) { + free(buf); + buf = NULL; + } + cam_freeccb(ccb); + return (buf); +} + +struct scsi_vpd_block_device_characteristics * +scsi_wrap_vpd_block_device_characteristics(struct cam_device *device) +{ + + return ((struct scsi_vpd_block_device_characteristics *)scsi_wrap_inquiry( + device, SVPD_BDC, sizeof(struct scsi_vpd_block_device_characteristics))); +} |