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libcam: Define depop structures and introduce scsi_wrap

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Define structures related to the depop set of commands (GET PHYSICAL ELEMENT
STATUS, REMOVE ELEMENT AND TRUNCATE, and RESTORE ELEMENT AND REBUILD) as
well as the CDB construction routines.

Also create scsi_wrap.c. This will have convenience routines that will do all
the elements of allocating the ccb, generating the CDB, sending the command
(looping as necessary for cases where data is returned, but it's size isn't
known up front), etc. As this functionality is fleshed out, calling many
camcontrol commands programatically gets much easier.

Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D29017
This commit is contained in:
Warner Losh 2021-09-17 16:29:22 -06:00
parent 2933a7ca03
commit da73926566
5 changed files with 390 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/libcam/Makefile
View File

@ -5,8 +5,8 @@ PACKAGE= runtime
LIB= cam
SHLIBDIR?= /lib
SRCS= camlib.c scsi_cmdparse.c scsi_all.c scsi_da.c scsi_sa.c cam.c \
ata_all.c nvme_all.c smp_all.c
INCS= camlib.h
ata_all.c nvme_all.c smp_all.c scsi_wrap.c
INCS= camlib.h scsi_wrap.h
LIBADD= sbuf

181
lib/libcam/scsi_wrap.c Normal file
View File

@ -0,0 +1,181 @@
/*-
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#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 */ (u_int8_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)));
}

38
lib/libcam/scsi_wrap.h Normal file
View File

@ -0,0 +1,38 @@
/*-
* 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.
*
* $FreeBSD$
*/
#ifndef _CAM_SCSI_WRAP_H
#define _CAM_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);
void *scsi_wrap_inquiry(struct cam_device *device, uint32_t page, uint32_t length);
struct scsi_vpd_block_device_characteristics *scsi_wrap_vpd_block_device_characteristics(
struct cam_device *device);
#endif /* _CAM_SCSI_WRAP_H */

82
sys/cam/scsi/scsi_all.c
View File

@ -8751,6 +8751,88 @@ scsi_send_diagnostic(struct ccb_scsiio *csio, u_int32_t retries,
timeout);
}
void
scsi_get_physical_element_status(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb *),
uint8_t tag_action, uint8_t *data_ptr,
uint16_t allocation_length, uint8_t report_type,
uint32_t starting_element,
uint8_t sense_len, uint32_t timeout)
{
struct scsi_get_physical_element_status *scsi_cmd;
scsi_cmd = (struct scsi_get_physical_element_status *)&csio->cdb_io.cdb_bytes;
memset(scsi_cmd, 0, sizeof(*scsi_cmd));
scsi_cmd->opcode = SERVICE_ACTION_IN;
scsi_cmd->service_action = GET_PHYSICAL_ELEMENT_STATUS;
scsi_ulto4b(starting_element, scsi_cmd->starting_element);
scsi_ulto4b(allocation_length, scsi_cmd->allocation_length);
cam_fill_csio(csio,
retries,
cbfcnp,
/*flags*/ CAM_DIR_IN,
tag_action,
data_ptr,
allocation_length,
sense_len,
sizeof(*scsi_cmd),
timeout);
}
void
scsi_remove_element_and_truncate(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb *),
uint8_t tag_action,
uint64_t requested_capacity, uint32_t element_id,
uint8_t sense_len, uint32_t timeout)
{
struct scsi_remove_element_and_truncate *scsi_cmd;
scsi_cmd = (struct scsi_remove_element_and_truncate *)&csio->cdb_io.cdb_bytes;
memset(scsi_cmd, 0, sizeof(*scsi_cmd));
scsi_cmd->opcode = SERVICE_ACTION_IN;
scsi_cmd->service_action = REMOVE_ELEMENT_AND_TRUNCATE;
scsi_u64to8b(requested_capacity, scsi_cmd->requested_capacity);
scsi_ulto4b(element_id, scsi_cmd->element_identifier);
cam_fill_csio(csio,
retries,
cbfcnp,
/*flags*/ CAM_DIR_OUT,
tag_action,
NULL,
0,
sense_len,
sizeof(*scsi_cmd),
timeout);
}
void
scsi_restore_elements_and_rebuild(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb *),
uint8_t tag_action,
uint8_t sense_len, uint32_t timeout)
{
struct scsi_service_action_in *scsi_cmd;
scsi_cmd = (struct scsi_service_action_in *)&csio->cdb_io.cdb_bytes;
memset(scsi_cmd, 0, sizeof(*scsi_cmd));
scsi_cmd->opcode = SERVICE_ACTION_IN;
scsi_cmd->service_action = RESTORE_ELEMENTS_AND_REBUILD;
cam_fill_csio(csio,
retries,
cbfcnp,
/*flags*/ CAM_DIR_OUT,
tag_action,
NULL,
0,
sense_len,
sizeof(*scsi_cmd),
timeout);
}
void
scsi_read_buffer(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb*),

87
sys/cam/scsi/scsi_all.h
View File

@ -2158,6 +2158,9 @@ struct ata_pass_32 {
#define REPORT_PRIORITY 0x0E
#define REPORT_TIMESTAMP 0x0F
#define MANAGEMENT_PROTOCOL_IN 0x10
#define GET_PHYSICAL_ELEMENT_STATUS 0x17
#define REMOVE_ELEMENT_AND_TRUNCATE 0x18
#define RESTORE_ELEMENTS_AND_REBUILD 0x19
/* Maintenance Out Service Action Codes */
#define SET_IDENTIFY_INFORMATION 0x06
#define SET_TARGET_PORT_GROUPS 0x0A
@ -2847,6 +2850,8 @@ struct scsi_vpd_block_device_characteristics
uint8_t depopulation_time[4];
uint8_t reserved2[48];
};
_Static_assert(sizeof(struct scsi_vpd_block_device_characteristics) == 64,
"scsi_vpd_block_characteristics wrong size");
#define SBDC_IS_PRESENT(bdc, length, field) \
((length >= offsetof(struct scsi_vpd_block_device_characteristics, \
@ -3064,6 +3069,70 @@ struct scsi_report_luns_data {
struct scsi_report_luns_lundata luns[0];
};
/*
* GET PHYSICAL ELEMENT STATUS (GPES) from SBC-4 (r21 or later)
* REMOVE ELEMENT AND TRUNCATE (RET) from SBC-4 (r21 or later)
* RESTORE ELEMENT AND REBUILD (RER) from SBC-4 (r21 or later)
*
* Queries drives that support it for the status of feach of their physical
* storage elements (which typically map to heads, but aren't required to).
* These elements can be selective removed (at a reduced capacity) or restored
* to service.
*/
struct scsi_get_physical_element_status
{
uint8_t opcode;
uint8_t service_action;
uint8_t rsvd[4];
uint8_t starting_element[4];
uint8_t allocation_length[4];
uint8_t report_type;
#define SCSI_GPES_FILTER_ALL 0x00
#define SCSI_GPES_FILTER_EXEPTION 0x40
#define SCSI_GPES_REPORT_TYPE_PHYS 0x00
#define SCSI_GEPS_REPORT_TYPE_STORAGE 0x01
uint8_t control;
};
_Static_assert(sizeof(struct scsi_get_physical_element_status) == 16,
"scsi_get_physical_element_status wrong size");
struct scsi_get_physical_element_hdr
{
uint8_t num_descriptors[4];
uint8_t num_returned[4];
uint8_t id_depop[4];
uint8_t rsvd[20];
};
_Static_assert(sizeof(struct scsi_get_physical_element_hdr) == 32,
"scsi_get_physical_element_hdr wrong size");
struct scsi_get_physical_element_descriptor
{
uint8_t rsvd1[4];
uint8_t element_identifier[4];
uint8_t rsvd2[5];
uint8_t ralwd;
uint8_t physical_element_type;
#define GPED_TYPE_STORAGE 0x1
uint8_t physical_element_health;
uint8_t capacity[8];
uint8_t rsvd3[8];
};
_Static_assert(sizeof(struct scsi_get_physical_element_descriptor) == 32,
"scsi_get_physical_element_descriptor wrong size");
struct scsi_remove_element_and_truncate
{
uint8_t opcode;
uint8_t service_action;
uint8_t requested_capacity[8];
uint8_t element_identifier[4];
uint8_t rsvd;
uint8_t control;
};
_Static_assert(sizeof(struct scsi_remove_element_and_truncate) == 16,
"scsi_remove_element_and_truncate wrong size");
struct scsi_target_group
{
uint8_t opcode;
@ -4160,6 +4229,24 @@ void scsi_send_diagnostic(struct ccb_scsiio *csio, u_int32_t retries,
uint16_t param_list_length, uint8_t sense_len,
uint32_t timeout);
void scsi_get_physical_element_status(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb *),
uint8_t tag_action, uint8_t *data_ptr,
uint16_t allocation_length, uint8_t report_type,
uint32_t starting_element,
uint8_t sense_len, uint32_t timeout);
void scsi_remove_element_and_truncate(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb *),
uint8_t tag_action,
uint64_t requested_capacity, uint32_t element_id,
uint8_t sense_len, uint32_t timeout);
void scsi_restore_elements_and_rebuild(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb *),
uint8_t tag_action,
uint8_t sense_len, uint32_t timeout);
void scsi_read_buffer(struct ccb_scsiio *csio, u_int32_t retries,
void (*cbfcnp)(struct cam_periph *, union ccb*),
uint8_t tag_action, int mode,