215 lines
7.1 KiB
C
215 lines
7.1 KiB
C
/*
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* SCSI definitions for s390 machine loader for qemu
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*
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* Copyright 2015 IBM Corp.
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* Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef SCSI_H
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#define SCSI_H
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#include "s390-ccw.h"
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#define SCSI_DEFAULT_CDB_SIZE 32
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#define SCSI_DEFAULT_SENSE_SIZE 96
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#define CDB_STATUS_GOOD 0
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#define CDB_STATUS_CHECK_CONDITION 0x02U
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#define CDB_STATUS_VALID(status) (((status) & ~0x3eU) == 0)
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#define SCSI_SENSE_CODE_MASK 0x7fU
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#define SCSI_SENSE_KEY_MASK 0x0fU
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#define SCSI_SENSE_KEY_NO_SENSE 0
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#define SCSI_SENSE_KEY_UNIT_ATTENTION 6
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/* SCSI Inquiry Types */
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#define SCSI_INQUIRY_STANDARD 0x00U
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#define SCSI_INQUIRY_EVPD 0x01U
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/* SCSI Inquiry Pages */
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#define SCSI_INQUIRY_STANDARD_NONE 0x00U
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#define SCSI_INQUIRY_EVPD_SUPPORTED_PAGES 0x00U
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#define SCSI_INQUIRY_EVPD_BLOCK_LIMITS 0xb0U
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union ScsiLun {
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uint64_t v64; /* numeric shortcut */
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uint8_t v8[8]; /* generic 8 bytes representation */
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uint16_t v16[4]; /* 4-level big-endian LUN as specified by SAM-2 */
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};
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typedef union ScsiLun ScsiLun;
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struct ScsiSense70 {
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uint8_t b0; /* b0 & 7f = resp code (0x70 or 0x71) */
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uint8_t b1, b2; /* b2 & 0f = sense key */
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uint8_t u1[1 * 4 + 1 + 1 * 4]; /* b7 = N - 7 */
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uint8_t additional_sense_code; /* b12 */
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uint8_t additional_sense_code_qualifier; /* b13 */
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uint8_t u2[1 + 3 + 0]; /* up to N (<=252) bytes */
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} __attribute__((packed));
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typedef struct ScsiSense70 ScsiSense70;
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/* don't confuse with virtio-scsi response/status fields! */
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static inline uint8_t scsi_sense_response(const void *p)
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{
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return ((const ScsiSense70 *)p)->b0 & SCSI_SENSE_CODE_MASK;
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}
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static inline uint8_t scsi_sense_key(const void *p)
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{
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return ((const ScsiSense70 *)p)->b2 & SCSI_SENSE_KEY_MASK;
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}
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#define SCSI_INQ_RDT_CDROM 0x05
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struct ScsiInquiryStd {
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uint8_t peripheral_qdt; /* b0, use (b0 & 0x1f) to get SCSI_INQ_RDT */
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uint8_t b1; /* Removable Media Bit = b1 & 0x80 */
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uint8_t spc_version; /* b2 */
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uint8_t b3; /* b3 & 0x0f == resp_data_fmt == 2, must! */
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uint8_t u1[1 + 1 + 1 + 1 + 8]; /* b4..b15 unused, b4 = (N - 1) */
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char prod_id[16]; /* "QEMU CD-ROM" is here */
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uint8_t u2[4 /* b32..b35 unused, mandatory */
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+ 8 + 12 + 1 + 1 + 8 * 2 + 22 /* b36..95 unused, optional*/
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+ 0]; /* b96..bN unused, vendor specific */
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/* byte N */
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} __attribute__((packed));
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typedef struct ScsiInquiryStd ScsiInquiryStd;
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struct ScsiInquiryEvpdPages {
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uint8_t peripheral_qdt; /* b0, use (b0 & 0x1f) to get SCSI_INQ_RDT */
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uint8_t page_code; /* b1 */
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uint16_t page_length; /* b2..b3 length = N-3 */
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uint8_t byte[28]; /* b4..bN Supported EVPD pages (N=31 here) */
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} __attribute__((packed));
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typedef struct ScsiInquiryEvpdPages ScsiInquiryEvpdPages;
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struct ScsiInquiryEvpdBl {
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uint8_t peripheral_qdt; /* b0, use (b0 & 0x1f) to get SCSI_INQ_RDT */
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uint8_t page_code;
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uint16_t page_length;
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uint8_t b4;
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uint8_t b5;
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uint16_t b6;
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uint32_t max_transfer; /* b8 */
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uint32_t b12[7]; /* b12..b43 (defined fields) */
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uint32_t b44[5]; /* b44..b63 (reserved fields) */
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} __attribute__((packed));
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typedef struct ScsiInquiryEvpdBl ScsiInquiryEvpdBl;
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struct ScsiCdbInquiry {
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uint8_t command; /* b0, == 0x12 */
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uint8_t b1; /* b1, |= 0x01 (evpd) */
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uint8_t b2; /* b2; if evpd==1 */
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uint16_t alloc_len; /* b3, b4 */
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uint8_t control; /* b5 */
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} __attribute__((packed));
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typedef struct ScsiCdbInquiry ScsiCdbInquiry;
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struct ScsiCdbRead10 {
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uint8_t command; /* =0x28 */
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uint8_t b1;
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uint32_t lba;
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uint8_t b6;
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uint16_t xfer_length;
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uint8_t control;
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} __attribute__((packed));
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typedef struct ScsiCdbRead10 ScsiCdbRead10;
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struct ScsiCdbTestUnitReady {
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uint8_t command; /* =0x00 */
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uint8_t b1_b4[4];
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uint8_t control;
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} __attribute__((packed));
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typedef struct ScsiCdbTestUnitReady ScsiCdbTestUnitReady;
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struct ScsiCdbReportLuns {
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uint8_t command; /* =0xa0 */
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uint8_t b1;
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uint8_t select_report; /* =0x02, "all" */
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uint8_t b3_b5[3];
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uint32_t alloc_len;
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uint8_t b10;
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uint8_t control;
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} __attribute__((packed));
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typedef struct ScsiCdbReportLuns ScsiCdbReportLuns;
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struct ScsiLunReport {
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uint32_t lun_list_len;
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uint32_t b4_b7;
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ScsiLun lun[1]; /* space for at least 1 lun must be allocated */
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} __attribute__((packed));
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typedef struct ScsiLunReport ScsiLunReport;
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struct ScsiCdbReadCapacity16 {
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uint8_t command; /* =0x9e = "service action in 16" */
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uint8_t service_action; /* 5 bits, =0x10 = "read capacity 16" */
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uint64_t b2_b9;
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uint32_t alloc_len;
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uint8_t b14;
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uint8_t control;
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} __attribute__((packed));
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typedef struct ScsiCdbReadCapacity16 ScsiCdbReadCapacity16;
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struct ScsiReadCapacity16Data {
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uint64_t ret_lba; /* get it, 0..7 */
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uint32_t lb_len; /* bytes, 8..11 */
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uint8_t u1[2 + 1 * 2 + 16]; /* b12..b31, unused */
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} __attribute__((packed));
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typedef struct ScsiReadCapacity16Data ScsiReadCapacity16Data;
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static inline ScsiLun make_lun(uint16_t channel, uint16_t target, uint32_t lun)
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{
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ScsiLun r = { .v64 = 0 };
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/* See QEMU code to choose the way to handle LUNs.
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*
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* So, a valid LUN must have (always channel #0):
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* lun[0] == 1
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* lun[1] - target, any value
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* lun[2] == 0 or (LUN, MSB, 0x40 set, 0x80 clear)
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* lun[3] - LUN, LSB, any value
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*/
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r.v8[0] = 1;
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r.v8[1] = target & 0xffU;
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r.v8[2] = (lun >> 8) & 0x3fU;
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if (r.v8[2]) {
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r.v8[2] |= 0x40;
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}
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r.v8[3] = lun & 0xffU;
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return r;
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}
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static inline const char *scsi_cdb_status_msg(uint8_t status)
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{
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static char err_msg[] = "STATUS=XX";
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uint8_t v = status & 0x3eU;
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fill_hex_val(err_msg + 7, &v, 1);
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return err_msg;
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}
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static inline const char *scsi_cdb_asc_msg(const void *s)
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{
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static char err_msg[] = "RSPN=XX KEY=XX CODE=XX QLFR=XX";
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const ScsiSense70 *p = s;
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uint8_t sr = scsi_sense_response(s);
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uint8_t sk = scsi_sense_key(s);
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uint8_t ac = p->additional_sense_code;
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uint8_t cq = p->additional_sense_code_qualifier;
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fill_hex_val(err_msg + 5, &sr, 1);
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fill_hex_val(err_msg + 12, &sk, 1);
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fill_hex_val(err_msg + 20, &ac, 1);
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fill_hex_val(err_msg + 28, &cq, 1);
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return err_msg;
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}
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#endif /* SCSI_H */
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