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code.illumos.org / illumos-gate / bbb9d5d65bf8372aae4b8821c80e218b8b832846 / . / usr / src / uts / common / io / emul64_bsd.c
blob: 3d91f696bfddf39f3f347c8f1c79e494c29ca163 [file] [log] [blame]
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* pseudo scsi disk driver
*/
#include <sys/scsi/scsi.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/kmem.h>
#include <sys/taskq.h>
#include <sys/disp.h>
#include <sys/types.h>
#include <sys/buf.h>
#include <sys/emul64.h>
#include <sys/emul64cmd.h>
#include <sys/emul64var.h>
/*
* Mode sense/select page control
*/
#define MODE_SENSE_PC_CURRENT 0
#define MODE_SENSE_PC_CHANGEABLE 1
#define MODE_SENSE_PC_DEFAULT 2
#define MODE_SENSE_PC_SAVED 3
/*
* Byte conversion macros
*/
#if defined(_BIG_ENDIAN)
#define ushort_to_scsi_ushort(n) (n)
#define uint32_to_scsi_uint32(n) (n)
#define uint64_to_scsi_uint64(n) (n)
#elif defined(_LITTLE_ENDIAN)
#define ushort_to_scsi_ushort(n) \
((((n) & 0x00ff) << 8) | \
(((n) & 0xff00) >> 8))
#define uint32_to_scsi_uint32(n) \
((((n) & 0x000000ff) << 24) | \
(((n) & 0x0000ff00) << 8) | \
(((n) & 0x00ff0000) >> 8) | \
(((n) & 0xff000000) >> 24))
#define uint64_to_scsi_uint64(n) \
((((n) & 0x00000000000000ff) << 56) | \
(((n) & 0x000000000000ff00) << 40) | \
(((n) & 0x0000000000ff0000) << 24) | \
(((n) & 0x00000000ff000000) << 8) | \
(((n) & 0x000000ff00000000) >> 8) | \
(((n) & 0x0000ff0000000000) >> 24) | \
(((n) & 0x00ff000000000000) >> 40) | \
(((n) & 0xff00000000000000) >> 56))
#else
error no _BIG_ENDIAN or _LITTLE_ENDIAN
#endif
#define uint_to_byte0(n) ((n) & 0xff)
#define uint_to_byte1(n) (((n)>>8) & 0xff)
#define uint_to_byte2(n) (((n)>>16) & 0xff)
#define uint_to_byte3(n) (((n)>>24) & 0xff)
/*
* struct prop_map
*
* This structure maps a property name to the place to store its value.
*/
struct prop_map {
char *pm_name; /* Name of the property. */
int *pm_value; /* Place to store the value. */
};
static int emul64_debug_blklist = 0;
/*
* Some interesting statistics. These are protected by the
* emul64_stats_mutex. It would be nice to have an ioctl to print them out,
* but we don't have the development time for that now. You can at least
* look at them with adb.
*/
int emul64_collect_stats = 1; /* Collect stats if non-zero */
kmutex_t emul64_stats_mutex; /* Protect these variables */
long emul64_nowrite_count = 0; /* # active nowrite ranges */
static uint64_t emul64_skipped_io = 0; /* Skipped I/O operations, because of */
/* EMUL64_WRITE_OFF. */
static uint64_t emul64_skipped_blk = 0; /* Skipped blocks because of */
/* EMUL64_WRITE_OFF. */
static uint64_t emul64_io_ops = 0; /* Total number of I/O operations */
/* including skipped and actual. */
static uint64_t emul64_io_blocks = 0; /* Total number of blocks involved */
/* in I/O operations. */
static uint64_t emul64_nonzero = 0; /* Number of non-zero data blocks */
/* currently held in memory */
static uint64_t emul64_max_list_length = 0; /* Maximum size of a linked */
/* list of non-zero blocks. */
uint64_t emul64_taskq_max = 0; /* emul64_scsi_start uses the taskq */
/* mechanism to dispatch work. */
/* If the number of entries in the */
/* exceeds the maximum for the queue */
/* the queue a 1 second delay is */
/* encountered in taskq_ent_alloc. */
/* This counter counts the number */
/* times that this happens. */
/*
* Since emul64 does no physical I/O, operations that would normally be I/O
* intensive become CPU bound. An example of this is RAID 5
* initialization. When the kernel becomes CPU bound, it looks as if the
* machine is hung.
*
* To avoid this problem, we provide a function, emul64_yield_check, that does a
* delay from time to time to yield up the CPU. The following variables
* are tunables for this algorithm.
*
* emul64_num_delay_called Number of times we called delay. This is
* not really a tunable. Rather it is a
* counter that provides useful information
* for adjusting the tunables.
* emul64_yield_length Number of microseconds to yield the CPU.
* emul64_yield_period Number of I/O operations between yields.
* emul64_yield_enable emul64 will yield the CPU, only if this
* variable contains a non-zero value. This
* allows the yield functionality to be turned
* off for experimentation purposes.
*
* The value of 1000 for emul64_yield_period has been determined by
* experience with running the tests.
*/
static uint64_t emul64_num_delay_called = 0;
static int emul64_yield_length = 1000;
static int emul64_yield_period = 1000;
static int emul64_yield_enable = 1;
static kmutex_t emul64_yield_mutex;
static kcondvar_t emul64_yield_cv;
/*
* This array establishes a set of tunable variables that can be set by
* defining properties in the emul64.conf file.
*/
struct prop_map emul64_properties[] = {
"emul64_collect_stats", &emul64_collect_stats,
"emul64_yield_length", &emul64_yield_length,
"emul64_yield_period", &emul64_yield_period,
"emul64_yield_enable", &emul64_yield_enable,
"emul64_max_task", &emul64_max_task,
"emul64_task_nthreads", &emul64_task_nthreads
};
static unsigned char *emul64_zeros = NULL; /* Block of 0s for comparison */
extern void emul64_check_cond(struct scsi_pkt *pkt, uchar_t key,
uchar_t asc, uchar_t ascq);
/* ncyl=250000 acyl=2 nhead=24 nsect=357 */
uint_t dkg_rpm = 3600;
static int bsd_mode_sense_dad_mode_geometry(struct scsi_pkt *);
static int bsd_mode_sense_dad_mode_err_recov(struct scsi_pkt *);
static int bsd_mode_sense_modepage_disco_reco(struct scsi_pkt *);
static int bsd_mode_sense_dad_mode_format(struct scsi_pkt *);
static int bsd_mode_sense_dad_mode_cache(struct scsi_pkt *);
static int bsd_readblks(struct emul64 *, ushort_t, ushort_t, diskaddr_t,
int, unsigned char *);
static int bsd_writeblks(struct emul64 *, ushort_t, ushort_t, diskaddr_t,
int, unsigned char *);
emul64_tgt_t *find_tgt(struct emul64 *, ushort_t, ushort_t);
static blklist_t *bsd_findblk(emul64_tgt_t *, diskaddr_t, avl_index_t *);
static void bsd_allocblk(emul64_tgt_t *, diskaddr_t, caddr_t, avl_index_t);
static void bsd_freeblk(emul64_tgt_t *, blklist_t *);
static void emul64_yield_check();
static emul64_rng_overlap_t bsd_tgt_overlap(emul64_tgt_t *, diskaddr_t, int);
char *emul64_name = "emul64";
/*
* Initialize globals in this file.
*/
void
emul64_bsd_init()
{
emul64_zeros = (unsigned char *) kmem_zalloc(DEV_BSIZE, KM_SLEEP);
mutex_init(&emul64_stats_mutex, NULL, MUTEX_DRIVER, NULL);
mutex_init(&emul64_yield_mutex, NULL, MUTEX_DRIVER, NULL);
cv_init(&emul64_yield_cv, NULL, CV_DRIVER, NULL);
}
/*
* Clean up globals in this file.
*/
void
emul64_bsd_fini()
{
cv_destroy(&emul64_yield_cv);
mutex_destroy(&emul64_yield_mutex);
mutex_destroy(&emul64_stats_mutex);
if (emul64_zeros != NULL) {
kmem_free(emul64_zeros, DEV_BSIZE);
emul64_zeros = NULL;
}
}
/*
* Attempt to get the values of the properties that are specified in the
* emul64_properties array. If the property exists, copy its value to the
* specified location. All the properties have been assigned default
* values in this driver, so if we cannot get the property that is not a
* problem.
*/
void
emul64_bsd_get_props(dev_info_t *dip)
{
uint_t count;
uint_t i;
struct prop_map *pmp;
int *properties;
for (pmp = emul64_properties, i = 0;
i < sizeof (emul64_properties) / sizeof (struct prop_map);
i++, pmp++) {
if (ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dip,
DDI_PROP_DONTPASS, pmp->pm_name, &properties,
&count) == DDI_PROP_SUCCESS) {
if (count >= 1) {
*pmp->pm_value = *properties;
}
ddi_prop_free((void *) properties);
}
}
}
int
emul64_bsd_blkcompare(const void *a1, const void *b1)
{
blklist_t *a = (blklist_t *)a1;
blklist_t *b = (blklist_t *)b1;
if (a->bl_blkno < b->bl_blkno)
return (-1);
if (a->bl_blkno == b->bl_blkno)
return (0);
return (1);
}
/* ARGSUSED 0 */
int
bsd_scsi_start_stop_unit(struct scsi_pkt *pkt)
{
return (0);
}
/* ARGSUSED 0 */
int
bsd_scsi_test_unit_ready(struct scsi_pkt *pkt)
{
return (0);
}
/* ARGSUSED 0 */
int
bsd_scsi_request_sense(struct scsi_pkt *pkt)
{
return (0);
}
int
bsd_scsi_inq_page0(struct scsi_pkt *pkt, uchar_t pqdtype)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
if (sp->cmd_count < 6) {
cmn_err(CE_CONT, "%s: bsd_scsi_inq_page0: size %d required\n",
emul64_name, 6);
return (EIO);
}
sp->cmd_addr[0] = pqdtype; /* periph qual., dtype */
sp->cmd_addr[1] = 0; /* page code */
sp->cmd_addr[2] = 0; /* reserved */
sp->cmd_addr[3] = 6 - 3; /* length */
sp->cmd_addr[4] = 0; /* 1st page */
sp->cmd_addr[5] = 0x83; /* 2nd page */
pkt->pkt_resid = sp->cmd_count - 6;
return (0);
}
int
bsd_scsi_inq_page83(struct scsi_pkt *pkt, uchar_t pqdtype)
{
struct emul64 *emul64 = PKT2EMUL64(pkt);
struct emul64_cmd *sp = PKT2CMD(pkt);
int instance = ddi_get_instance(emul64->emul64_dip);
if (sp->cmd_count < 22) {
cmn_err(CE_CONT, "%s: bsd_scsi_inq_page83: size %d required\n",
emul64_name, 22);
return (EIO);
}
sp->cmd_addr[0] = pqdtype; /* periph qual., dtype */
sp->cmd_addr[1] = 0x83; /* page code */
sp->cmd_addr[2] = 0; /* reserved */
sp->cmd_addr[3] = (22 - 8) + 4; /* length */
sp->cmd_addr[4] = 1; /* code set - binary */
sp->cmd_addr[5] = 3; /* association and device ID type 3 */
sp->cmd_addr[6] = 0; /* reserved */
sp->cmd_addr[7] = 22 - 8; /* ID length */
sp->cmd_addr[8] = 0xde; /* @8: identifier, byte 0 */
sp->cmd_addr[9] = 0xca;
sp->cmd_addr[10] = 0xde;
sp->cmd_addr[11] = 0x80;
sp->cmd_addr[12] = 0xba;
sp->cmd_addr[13] = 0xbe;
sp->cmd_addr[14] = 0xab;
sp->cmd_addr[15] = 0xba;
/* @22: */
/*
* Instances seem to be assigned sequentially, so it unlikely that we
* will have more than 65535 of them.
*/
sp->cmd_addr[16] = uint_to_byte1(instance);
sp->cmd_addr[17] = uint_to_byte0(instance);
sp->cmd_addr[18] = uint_to_byte1(TGT(sp));
sp->cmd_addr[19] = uint_to_byte0(TGT(sp));
sp->cmd_addr[20] = uint_to_byte1(LUN(sp));
sp->cmd_addr[21] = uint_to_byte0(LUN(sp));
pkt->pkt_resid = sp->cmd_count - 22;
return (0);
}
int
bsd_scsi_inquiry(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
emul64_tgt_t *tgt;
uchar_t pqdtype;
struct scsi_inquiry inq;
EMUL64_MUTEX_ENTER(sp->cmd_emul64);
tgt = find_tgt(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun);
EMUL64_MUTEX_EXIT(sp->cmd_emul64);
if (sp->cmd_count < sizeof (inq)) {
cmn_err(CE_CONT, "%s: bsd_scsi_inquiry: size %d required\n",
emul64_name, (int)sizeof (inq));
return (EIO);
}
if (cdb->cdb_opaque[1] & 0xfc) {
cmn_err(CE_WARN, "%s: bsd_scsi_inquiry: 0x%x",
emul64_name, cdb->cdb_opaque[1]);
emul64_check_cond(pkt, 0x5, 0x24, 0x0); /* inv. fld in cdb */
return (0);
}
pqdtype = tgt->emul64_tgt_dtype;
if (cdb->cdb_opaque[1] & 0x1) {
switch (cdb->cdb_opaque[2]) {
case 0x00:
return (bsd_scsi_inq_page0(pkt, pqdtype));
case 0x83:
return (bsd_scsi_inq_page83(pkt, pqdtype));
default:
cmn_err(CE_WARN, "%s: bsd_scsi_inquiry: "
"unsupported 0x%x",
emul64_name, cdb->cdb_opaque[2]);
return (0);
}
}
/* set up the inquiry data we return */
(void) bzero((void *)&inq, sizeof (inq));
inq.inq_dtype = pqdtype;
inq.inq_ansi = 2;
inq.inq_rdf = 2;
inq.inq_len = sizeof (inq) - 4;
inq.inq_wbus16 = 1;
inq.inq_cmdque = 1;
(void) bcopy(tgt->emul64_tgt_inq, inq.inq_vid,
sizeof (tgt->emul64_tgt_inq));
(void) bcopy("1", inq.inq_revision, 2);
(void) bcopy((void *)&inq, sp->cmd_addr, sizeof (inq));
pkt->pkt_resid = sp->cmd_count - sizeof (inq);
return (0);
}
/* ARGSUSED 0 */
int
bsd_scsi_format(struct scsi_pkt *pkt)
{
return (0);
}
int
bsd_scsi_io(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
diskaddr_t lblkno;
int nblks;
switch (cdb->scc_cmd) {
case SCMD_READ:
lblkno = (uint32_t)GETG0ADDR(cdb);
nblks = GETG0COUNT(cdb);
pkt->pkt_resid = bsd_readblks(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun,
lblkno, nblks, sp->cmd_addr);
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_io: "
"read g0 blk=%lld (0x%llx) nblks=%d\n",
emul64_name, lblkno, lblkno, nblks);
}
break;
case SCMD_WRITE:
lblkno = (uint32_t)GETG0ADDR(cdb);
nblks = GETG0COUNT(cdb);
pkt->pkt_resid = bsd_writeblks(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun,
lblkno, nblks, sp->cmd_addr);
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_io: "
"write g0 blk=%lld (0x%llx) nblks=%d\n",
emul64_name, lblkno, lblkno, nblks);
}
break;
case SCMD_READ_G1:
lblkno = (uint32_t)GETG1ADDR(cdb);
nblks = GETG1COUNT(cdb);
pkt->pkt_resid = bsd_readblks(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun,
lblkno, nblks, sp->cmd_addr);
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_io: "
"read g1 blk=%lld (0x%llx) nblks=%d\n",
emul64_name, lblkno, lblkno, nblks);
}
break;
case SCMD_WRITE_G1:
lblkno = (uint32_t)GETG1ADDR(cdb);
nblks = GETG1COUNT(cdb);
pkt->pkt_resid = bsd_writeblks(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun,
lblkno, nblks, sp->cmd_addr);
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_io: "
"write g1 blk=%lld (0x%llx) nblks=%d\n",
emul64_name, lblkno, lblkno, nblks);
}
break;
case SCMD_READ_G4:
lblkno = GETG4ADDR(cdb);
lblkno <<= 32;
lblkno |= (uint32_t)GETG4ADDRTL(cdb);
nblks = GETG4COUNT(cdb);
pkt->pkt_resid = bsd_readblks(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun,
lblkno, nblks, sp->cmd_addr);
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_io: "
"read g4 blk=%lld (0x%llx) nblks=%d\n",
emul64_name, lblkno, lblkno, nblks);
}
break;
case SCMD_WRITE_G4:
lblkno = GETG4ADDR(cdb);
lblkno <<= 32;
lblkno |= (uint32_t)GETG4ADDRTL(cdb);
nblks = GETG4COUNT(cdb);
pkt->pkt_resid = bsd_writeblks(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun,
lblkno, nblks, sp->cmd_addr);
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_io: "
"write g4 blk=%lld (0x%llx) nblks=%d\n",
emul64_name, lblkno, lblkno, nblks);
}
break;
default:
cmn_err(CE_WARN, "%s: bsd_scsi_io: unhandled I/O: 0x%x",
emul64_name, cdb->scc_cmd);
break;
}
if (pkt->pkt_resid != 0)
cmn_err(CE_WARN, "%s: bsd_scsi_io: "
"pkt_resid: 0x%lx, lblkno %lld, nblks %d",
emul64_name, pkt->pkt_resid, lblkno, nblks);
return (0);
}
int
bsd_scsi_log_sense(struct scsi_pkt *pkt)
{
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
struct emul64_cmd *sp = PKT2CMD(pkt);
int page_code;
if (sp->cmd_count < 9) {
cmn_err(CE_CONT, "%s: bsd_scsi_log_sense size %d required\n",
emul64_name, 9);
return (EIO);
}
page_code = cdb->cdb_opaque[2] & 0x3f;
if (page_code) {
cmn_err(CE_CONT, "%s: bsd_scsi_log_sense: "
"page 0x%x not supported\n", emul64_name, page_code);
emul64_check_cond(pkt, 0x5, 0x24, 0x0); /* inv. fld in cdb */
return (0);
}
sp->cmd_addr[0] = 0; /* page code */
sp->cmd_addr[1] = 0; /* reserved */
sp->cmd_addr[2] = 0; /* MSB of page length */
sp->cmd_addr[3] = 8 - 3; /* LSB of page length */
sp->cmd_addr[4] = 0; /* MSB of parameter code */
sp->cmd_addr[5] = 0; /* LSB of parameter code */
sp->cmd_addr[6] = 0; /* parameter control byte */
sp->cmd_addr[7] = 4 - 3; /* parameter length */
sp->cmd_addr[8] = 0x0; /* parameter value */
pkt->pkt_resid = sp->cmd_count - 9;
return (0);
}
int
bsd_scsi_mode_sense(struct scsi_pkt *pkt)
{
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
int page_control;
int page_code;
int rval = 0;
switch (cdb->scc_cmd) {
case SCMD_MODE_SENSE:
page_code = cdb->cdb_opaque[2] & 0x3f;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_mode_sense: "
"page=0x%x control=0x%x nbytes=%d\n",
emul64_name, page_code, page_control,
GETG0COUNT(cdb));
}
break;
case SCMD_MODE_SENSE_G1:
page_code = cdb->cdb_opaque[2] & 0x3f;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_scsi_mode_sense: "
"page=0x%x control=0x%x nbytes=%d\n",
emul64_name, page_code, page_control,
GETG1COUNT(cdb));
}
break;
default:
cmn_err(CE_CONT, "%s: bsd_scsi_mode_sense: "
"cmd 0x%x not supported\n", emul64_name, cdb->scc_cmd);
return (EIO);
}
switch (page_code) {
case DAD_MODE_GEOMETRY:
rval = bsd_mode_sense_dad_mode_geometry(pkt);
break;
case DAD_MODE_ERR_RECOV:
rval = bsd_mode_sense_dad_mode_err_recov(pkt);
break;
case MODEPAGE_DISCO_RECO:
rval = bsd_mode_sense_modepage_disco_reco(pkt);
break;
case DAD_MODE_FORMAT:
rval = bsd_mode_sense_dad_mode_format(pkt);
break;
case DAD_MODE_CACHE:
rval = bsd_mode_sense_dad_mode_cache(pkt);
break;
default:
cmn_err(CE_CONT, "%s: bsd_scsi_mode_sense: "
"page 0x%x not supported\n", emul64_name, page_code);
rval = EIO;
break;
}
return (rval);
}
static int
bsd_mode_sense_dad_mode_geometry(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
uchar_t *addr = (uchar_t *)sp->cmd_addr;
emul64_tgt_t *tgt;
int page_control;
struct mode_header header;
struct mode_geometry page4;
int ncyl;
int rval = 0;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_geometry: "
"pc=%d n=%d\n", emul64_name, page_control, sp->cmd_count);
}
if (sp->cmd_count < (sizeof (header) + sizeof (page4))) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_geometry: "
"size %d required\n",
emul64_name, (int)(sizeof (header) + sizeof (page4)));
return (EIO);
}
(void) bzero(&header, sizeof (header));
(void) bzero(&page4, sizeof (page4));
header.length = sizeof (header) + sizeof (page4) - 1;
header.bdesc_length = 0;
page4.mode_page.code = DAD_MODE_GEOMETRY;
page4.mode_page.ps = 1;
page4.mode_page.length = sizeof (page4) - sizeof (struct mode_page);
switch (page_control) {
case MODE_SENSE_PC_CURRENT:
case MODE_SENSE_PC_DEFAULT:
case MODE_SENSE_PC_SAVED:
EMUL64_MUTEX_ENTER(sp->cmd_emul64);
tgt = find_tgt(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun);
EMUL64_MUTEX_EXIT(sp->cmd_emul64);
ncyl = tgt->emul64_tgt_ncyls;
page4.cyl_ub = uint_to_byte2(ncyl);
page4.cyl_mb = uint_to_byte1(ncyl);
page4.cyl_lb = uint_to_byte0(ncyl);
page4.heads = uint_to_byte0(tgt->emul64_tgt_nheads);
page4.rpm = ushort_to_scsi_ushort(dkg_rpm);
break;
case MODE_SENSE_PC_CHANGEABLE:
page4.cyl_ub = 0xff;
page4.cyl_mb = 0xff;
page4.cyl_lb = 0xff;
page4.heads = 0xff;
page4.rpm = 0xffff;
break;
}
(void) bcopy(&header, addr, sizeof (header));
(void) bcopy(&page4, addr + sizeof (header), sizeof (page4));
pkt->pkt_resid = sp->cmd_count - sizeof (page4) - sizeof (header);
rval = 0;
return (rval);
}
static int
bsd_mode_sense_dad_mode_err_recov(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
uchar_t *addr = (uchar_t *)sp->cmd_addr;
int page_control;
struct mode_header header;
struct mode_err_recov page1;
int rval = 0;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_err_recov: "
"pc=%d n=%d\n", emul64_name, page_control, sp->cmd_count);
}
if (sp->cmd_count < (sizeof (header) + sizeof (page1))) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_err_recov: "
"size %d required\n",
emul64_name, (int)(sizeof (header) + sizeof (page1)));
return (EIO);
}
(void) bzero(&header, sizeof (header));
(void) bzero(&page1, sizeof (page1));
header.length = sizeof (header) + sizeof (page1) - 1;
header.bdesc_length = 0;
page1.mode_page.code = DAD_MODE_ERR_RECOV;
page1.mode_page.ps = 1;
page1.mode_page.length = sizeof (page1) - sizeof (struct mode_page);
switch (page_control) {
case MODE_SENSE_PC_CURRENT:
case MODE_SENSE_PC_DEFAULT:
case MODE_SENSE_PC_SAVED:
break;
case MODE_SENSE_PC_CHANGEABLE:
break;
}
(void) bcopy(&header, addr, sizeof (header));
(void) bcopy(&page1, addr + sizeof (header), sizeof (page1));
pkt->pkt_resid = sp->cmd_count - sizeof (page1) - sizeof (header);
rval = 0;
return (rval);
}
static int
bsd_mode_sense_modepage_disco_reco(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
int rval = 0;
uchar_t *addr = (uchar_t *)sp->cmd_addr;
int page_control;
struct mode_header header;
struct mode_disco_reco page2;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_modepage_disco_reco: "
"pc=%d n=%d\n", emul64_name, page_control, sp->cmd_count);
}
if (sp->cmd_count < (sizeof (header) + sizeof (page2))) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_modepage_disco_reco: "
"size %d required\n",
emul64_name, (int)(sizeof (header) + sizeof (page2)));
return (EIO);
}
(void) bzero(&header, sizeof (header));
(void) bzero(&page2, sizeof (page2));
header.length = sizeof (header) + sizeof (page2) - 1;
header.bdesc_length = 0;
page2.mode_page.code = MODEPAGE_DISCO_RECO;
page2.mode_page.ps = 1;
page2.mode_page.length = sizeof (page2) - sizeof (struct mode_page);
switch (page_control) {
case MODE_SENSE_PC_CURRENT:
case MODE_SENSE_PC_DEFAULT:
case MODE_SENSE_PC_SAVED:
break;
case MODE_SENSE_PC_CHANGEABLE:
break;
}
(void) bcopy(&header, addr, sizeof (header));
(void) bcopy(&page2, addr + sizeof (header), sizeof (page2));
pkt->pkt_resid = sp->cmd_count - sizeof (page2) - sizeof (header);
rval = 0;
return (rval);
}
static int
bsd_mode_sense_dad_mode_format(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
uchar_t *addr = (uchar_t *)sp->cmd_addr;
emul64_tgt_t *tgt;
int page_control;
struct mode_header header;
struct mode_format page3;
int rval = 0;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_format: "
"pc=%d n=%d\n", emul64_name, page_control, sp->cmd_count);
}
if (sp->cmd_count < (sizeof (header) + sizeof (page3))) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_format: "
"size %d required\n",
emul64_name, (int)(sizeof (header) + sizeof (page3)));
return (EIO);
}
(void) bzero(&header, sizeof (header));
(void) bzero(&page3, sizeof (page3));
header.length = sizeof (header) + sizeof (page3) - 1;
header.bdesc_length = 0;
page3.mode_page.code = DAD_MODE_FORMAT;
page3.mode_page.ps = 1;
page3.mode_page.length = sizeof (page3) - sizeof (struct mode_page);
switch (page_control) {
case MODE_SENSE_PC_CURRENT:
case MODE_SENSE_PC_DEFAULT:
case MODE_SENSE_PC_SAVED:
page3.data_bytes_sect = ushort_to_scsi_ushort(DEV_BSIZE);
page3.interleave = ushort_to_scsi_ushort(1);
EMUL64_MUTEX_ENTER(sp->cmd_emul64);
tgt = find_tgt(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun);
EMUL64_MUTEX_EXIT(sp->cmd_emul64);
page3.sect_track = ushort_to_scsi_ushort(tgt->emul64_tgt_nsect);
break;
case MODE_SENSE_PC_CHANGEABLE:
break;
}
(void) bcopy(&header, addr, sizeof (header));
(void) bcopy(&page3, addr + sizeof (header), sizeof (page3));
pkt->pkt_resid = sp->cmd_count - sizeof (page3) - sizeof (header);
rval = 0;
return (rval);
}
static int
bsd_mode_sense_dad_mode_cache(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
union scsi_cdb *cdb = (union scsi_cdb *)pkt->pkt_cdbp;
uchar_t *addr = (uchar_t *)sp->cmd_addr;
int page_control;
struct mode_header header;
struct mode_cache page8;
int rval = 0;
page_control = (cdb->cdb_opaque[2] >> 6) & 0x03;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_cache: "
"pc=%d n=%d\n", emul64_name, page_control, sp->cmd_count);
}
if (sp->cmd_count < (sizeof (header) + sizeof (page8))) {
cmn_err(CE_CONT, "%s: bsd_mode_sense_dad_mode_cache: "
"size %d required\n",
emul64_name, (int)(sizeof (header) + sizeof (page8)));
return (EIO);
}
(void) bzero(&header, sizeof (header));
(void) bzero(&page8, sizeof (page8));
header.length = sizeof (header) + sizeof (page8) - 1;
header.bdesc_length = 0;
page8.mode_page.code = DAD_MODE_CACHE;
page8.mode_page.ps = 1;
page8.mode_page.length = sizeof (page8) - sizeof (struct mode_page);
switch (page_control) {
case MODE_SENSE_PC_CURRENT:
case MODE_SENSE_PC_DEFAULT:
case MODE_SENSE_PC_SAVED:
break;
case MODE_SENSE_PC_CHANGEABLE:
break;
}
(void) bcopy(&header, addr, sizeof (header));
(void) bcopy(&page8, addr + sizeof (header), sizeof (page8));
pkt->pkt_resid = sp->cmd_count - sizeof (page8) - sizeof (header);
rval = 0;
return (rval);
}
/* ARGSUSED 0 */
int
bsd_scsi_mode_select(struct scsi_pkt *pkt)
{
return (0);
}
int
bsd_scsi_read_capacity_8(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
emul64_tgt_t *tgt;
struct scsi_capacity cap;
int rval = 0;
EMUL64_MUTEX_ENTER(sp->cmd_emul64);
tgt = find_tgt(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun);
EMUL64_MUTEX_EXIT(sp->cmd_emul64);
if (tgt->emul64_tgt_sectors > 0xffffffff)
cap.capacity = 0xffffffff;
else
cap.capacity =
uint32_to_scsi_uint32(tgt->emul64_tgt_sectors);
cap.lbasize = uint32_to_scsi_uint32((uint_t)DEV_BSIZE);
pkt->pkt_resid = sp->cmd_count - sizeof (struct scsi_capacity);
(void) bcopy(&cap, (caddr_t)sp->cmd_addr,
sizeof (struct scsi_capacity));
return (rval);
}
int
bsd_scsi_read_capacity_16(struct scsi_pkt *pkt)
{
struct emul64_cmd *sp = PKT2CMD(pkt);
emul64_tgt_t *tgt;
struct scsi_capacity_16 cap;
int rval = 0;
EMUL64_MUTEX_ENTER(sp->cmd_emul64);
tgt = find_tgt(sp->cmd_emul64,
pkt->pkt_address.a_target, pkt->pkt_address.a_lun);
EMUL64_MUTEX_EXIT(sp->cmd_emul64);
cap.sc_capacity = uint64_to_scsi_uint64(tgt->emul64_tgt_sectors);
cap.sc_lbasize = uint32_to_scsi_uint32((uint_t)DEV_BSIZE);
cap.sc_rto_en = 0;
cap.sc_prot_en = 0;
cap.sc_rsvd0 = 0;
bzero(&cap.sc_rsvd1[0], sizeof (cap.sc_rsvd1));
pkt->pkt_resid = sp->cmd_count - sizeof (struct scsi_capacity_16);
(void) bcopy(&cap, (caddr_t)sp->cmd_addr,
sizeof (struct scsi_capacity_16));
return (rval);
}
int
bsd_scsi_read_capacity(struct scsi_pkt *pkt)
{
return (bsd_scsi_read_capacity_8(pkt));
}
/* ARGSUSED 0 */
int
bsd_scsi_reserve(struct scsi_pkt *pkt)
{
return (0);
}
/* ARGSUSED 0 */
int
bsd_scsi_release(struct scsi_pkt *pkt)
{
return (0);
}
int
bsd_scsi_read_defect_list(struct scsi_pkt *pkt)
{
pkt->pkt_resid = 0;
return (0);
}
/* ARGSUSED 0 */
int
bsd_scsi_reassign_block(struct scsi_pkt *pkt)
{
return (0);
}
static int
bsd_readblks(struct emul64 *emul64, ushort_t target, ushort_t lun,
diskaddr_t blkno, int nblks, unsigned char *bufaddr)
{
emul64_tgt_t *tgt;
blklist_t *blk;
emul64_rng_overlap_t overlap;
int i = 0;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_readblks: "
"<%d,%d> blk %llu (0x%llx) nblks %d\n",
emul64_name, target, lun, blkno, blkno, nblks);
}
emul64_yield_check();
EMUL64_MUTEX_ENTER(emul64);
tgt = find_tgt(emul64, target, lun);
EMUL64_MUTEX_EXIT(emul64);
if (tgt == NULL) {
cmn_err(CE_WARN, "%s: bsd_readblks: no target for %d,%d\n",
emul64_name, target, lun);
goto unlocked_out;
}
if (emul64_collect_stats) {
mutex_enter(&emul64_stats_mutex);
emul64_io_ops++;
emul64_io_blocks += nblks;
mutex_exit(&emul64_stats_mutex);
}
mutex_enter(&tgt->emul64_tgt_blk_lock);
/*
* Keep the ioctls from changing the nowrite list for the duration
* of this I/O by grabbing emul64_tgt_nw_lock. This will keep the
* results from our call to bsd_tgt_overlap from changing while we
* do the I/O.
*/
rw_enter(&tgt->emul64_tgt_nw_lock, RW_READER);
overlap = bsd_tgt_overlap(tgt, blkno, nblks);
switch (overlap) {
case O_SAME:
case O_SUBSET:
case O_OVERLAP:
cmn_err(CE_WARN, "%s: bsd_readblks: "
"read to blocked area %lld,%d\n",
emul64_name, blkno, nblks);
rw_exit(&tgt->emul64_tgt_nw_lock);
goto errout;
case O_NONE:
break;
}
for (i = 0; i < nblks; i++) {
if (emul64_debug_blklist)
cmn_err(CE_CONT, "%s: bsd_readblks: "
"%d of %d: blkno %lld\n",
emul64_name, i+1, nblks, blkno);
if (blkno > tgt->emul64_tgt_sectors)
break;
blk = bsd_findblk(tgt, blkno, NULL);
if (blk) {
(void) bcopy(blk->bl_data, bufaddr, DEV_BSIZE);
} else {
(void) bzero(bufaddr, DEV_BSIZE);
}
blkno++;
bufaddr += DEV_BSIZE;
}
rw_exit(&tgt->emul64_tgt_nw_lock);
errout:
mutex_exit(&tgt->emul64_tgt_blk_lock);
unlocked_out:
return ((nblks - i) * DEV_BSIZE);
}
static int
bsd_writeblks(struct emul64 *emul64, ushort_t target, ushort_t lun,
diskaddr_t blkno, int nblks, unsigned char *bufaddr)
{
emul64_tgt_t *tgt;
blklist_t *blk;
emul64_rng_overlap_t overlap;
avl_index_t where;
int i = 0;
if (emul64debug) {
cmn_err(CE_CONT, "%s: bsd_writeblks: "
"<%d,%d> blk %llu (0x%llx) nblks %d\n",
emul64_name, target, lun, blkno, blkno, nblks);
}
emul64_yield_check();
EMUL64_MUTEX_ENTER(emul64);
tgt = find_tgt(emul64, target, lun);
EMUL64_MUTEX_EXIT(emul64);
if (tgt == NULL) {
cmn_err(CE_WARN, "%s: bsd_writeblks: no target for %d,%d\n",
emul64_name, target, lun);
goto unlocked_out;
}
if (emul64_collect_stats) {
mutex_enter(&emul64_stats_mutex);
emul64_io_ops++;
emul64_io_blocks += nblks;
mutex_exit(&emul64_stats_mutex);
}
mutex_enter(&tgt->emul64_tgt_blk_lock);
/*
* Keep the ioctls from changing the nowrite list for the duration
* of this I/O by grabbing emul64_tgt_nw_lock. This will keep the
* results from our call to bsd_tgt_overlap from changing while we
* do the I/O.
*/
rw_enter(&tgt->emul64_tgt_nw_lock, RW_READER);
overlap = bsd_tgt_overlap(tgt, blkno, nblks);
switch (overlap) {
case O_SAME:
case O_SUBSET:
if (emul64_collect_stats) {
mutex_enter(&emul64_stats_mutex);
emul64_skipped_io++;
emul64_skipped_blk += nblks;
mutex_exit(&emul64_stats_mutex);
}
rw_exit(&tgt->emul64_tgt_nw_lock);
mutex_exit(&tgt->emul64_tgt_blk_lock);
return (0);
case O_OVERLAP:
case O_NONE:
break;
}
for (i = 0; i < nblks; i++) {
if ((overlap == O_NONE) ||
(bsd_tgt_overlap(tgt, blkno, 1) == O_NONE)) {
/*
* If there was no overlap for the entire I/O range
* or if there is no overlap for this particular
* block, then we need to do the write.
*/
if (emul64_debug_blklist)
cmn_err(CE_CONT, "%s: bsd_writeblks: "
"%d of %d: blkno %lld\n",
emul64_name, i+1, nblks, blkno);
if (blkno > tgt->emul64_tgt_sectors) {
cmn_err(CE_WARN, "%s: bsd_writeblks: "
"blkno %lld, tgt_sectors %lld\n",
emul64_name, blkno,
tgt->emul64_tgt_sectors);
break;
}
blk = bsd_findblk(tgt, blkno, &where);
if (bcmp(bufaddr, emul64_zeros, DEV_BSIZE) == 0) {
if (blk) {
bsd_freeblk(tgt, blk);
}
} else {
if (blk) {
(void) bcopy(bufaddr, blk->bl_data,
DEV_BSIZE);
} else {
bsd_allocblk(tgt, blkno,
(caddr_t)bufaddr, where);
}
}
}
blkno++;
bufaddr += DEV_BSIZE;
}
/*
* Now that we're done with our I/O, allow the ioctls to change the
* nowrite list.
*/
rw_exit(&tgt->emul64_tgt_nw_lock);
errout:
mutex_exit(&tgt->emul64_tgt_blk_lock);
unlocked_out:
return ((nblks - i) * DEV_BSIZE);
}
emul64_tgt_t *
find_tgt(struct emul64 *emul64, ushort_t target, ushort_t lun)
{
emul64_tgt_t *tgt;
tgt = emul64->emul64_tgt;
while (tgt) {
if (tgt->emul64_tgt_saddr.a_target == target &&
tgt->emul64_tgt_saddr.a_lun == lun) {
break;
}
tgt = tgt->emul64_tgt_next;
}
return (tgt);
}
/*
* Free all blocks that are part of the specified range.
*/
int
bsd_freeblkrange(emul64_tgt_t *tgt, emul64_range_t *range)
{
blklist_t *blk;
blklist_t *nextblk;
ASSERT(mutex_owned(&tgt->emul64_tgt_blk_lock));
for (blk = (blklist_t *)avl_first(&tgt->emul64_tgt_data);
blk != NULL;
blk = nextblk) {
/*
* We need to get the next block pointer now, because blk
* will be freed inside the if statement.
*/
nextblk = AVL_NEXT(&tgt->emul64_tgt_data, blk);
if (emul64_overlap(range, blk->bl_blkno, (size_t)1) != O_NONE) {
bsd_freeblk(tgt, blk);
}
}
return (0);
}
static blklist_t *
bsd_findblk(emul64_tgt_t *tgt, diskaddr_t blkno, avl_index_t *where)
{
blklist_t *blk;
blklist_t search;
ASSERT(mutex_owned(&tgt->emul64_tgt_blk_lock));
search.bl_blkno = blkno;
blk = (blklist_t *)avl_find(&tgt->emul64_tgt_data, &search, where);
return (blk);
}
static void
bsd_allocblk(emul64_tgt_t *tgt,
diskaddr_t blkno,
caddr_t data,
avl_index_t where)
{
blklist_t *blk;
if (emul64_debug_blklist)
cmn_err(CE_CONT, "%s: bsd_allocblk: %llu\n",
emul64_name, blkno);
ASSERT(mutex_owned(&tgt->emul64_tgt_blk_lock));
blk = (blklist_t *)kmem_zalloc(sizeof (blklist_t), KM_SLEEP);
blk->bl_data = (uchar_t *)kmem_zalloc(DEV_BSIZE, KM_SLEEP);
blk->bl_blkno = blkno;
(void) bcopy(data, blk->bl_data, DEV_BSIZE);
avl_insert(&tgt->emul64_tgt_data, (void *) blk, where);
if (emul64_collect_stats) {
mutex_enter(&emul64_stats_mutex);
emul64_nonzero++;
tgt->emul64_list_length++;
if (tgt->emul64_list_length > emul64_max_list_length) {
emul64_max_list_length = tgt->emul64_list_length;
}
mutex_exit(&emul64_stats_mutex);
}
}
static void
bsd_freeblk(emul64_tgt_t *tgt, blklist_t *blk)
{
if (emul64_debug_blklist)
cmn_err(CE_CONT, "%s: bsd_freeblk: <%d,%d> blk=%lld\n",
emul64_name, tgt->emul64_tgt_saddr.a_target,
tgt->emul64_tgt_saddr.a_lun, blk->bl_blkno);
ASSERT(mutex_owned(&tgt->emul64_tgt_blk_lock));
avl_remove(&tgt->emul64_tgt_data, (void *) blk);
if (emul64_collect_stats) {
mutex_enter(&emul64_stats_mutex);
emul64_nonzero--;
tgt->emul64_list_length--;
mutex_exit(&emul64_stats_mutex);
}
kmem_free(blk->bl_data, DEV_BSIZE);
kmem_free(blk, sizeof (blklist_t));
}
/*
* Look for overlap between a nowrite range and a block range.
*
* NOTE: Callers of this function must hold the tgt->emul64_tgt_nw_lock
* lock. For the purposes of this function, a reader lock is
* sufficient.
*/
static emul64_rng_overlap_t
bsd_tgt_overlap(emul64_tgt_t *tgt, diskaddr_t blkno, int count)
{
emul64_nowrite_t *nw;
emul64_rng_overlap_t rv = O_NONE;
for (nw = tgt->emul64_tgt_nowrite;
(nw != NULL) && (rv == O_NONE);
nw = nw->emul64_nwnext) {
rv = emul64_overlap(&nw->emul64_blocked, blkno, (size_t)count);
}
return (rv);
}
/*
* Operations that do a lot of I/O, such as RAID 5 initializations, result
* in a CPU bound kernel when the device is an emul64 device. This makes
* the machine look hung. To avoid this problem, give up the CPU from time
* to time.
*/
static void
emul64_yield_check()
{
static uint_t emul64_io_count = 0; /* # I/Os since last wait */
static uint_t emul64_waiting = FALSE; /* TRUE -> a thread is in */
/* cv_timed wait. */
clock_t ticks;
if (emul64_yield_enable == 0)
return;
mutex_enter(&emul64_yield_mutex);
if (emul64_waiting == TRUE) {
/*
* Another thread has already started the timer. We'll
* just wait here until their time expires, and they
* broadcast to us. When they do that, we'll return and
* let our caller do more I/O.
*/
cv_wait(&emul64_yield_cv, &emul64_yield_mutex);
} else if (emul64_io_count++ > emul64_yield_period) {
/*
* Set emul64_waiting to let other threads know that we
* have started the timer.
*/
emul64_waiting = TRUE;
emul64_num_delay_called++;
ticks = drv_usectohz(emul64_yield_length);
if (ticks == 0)
ticks = 1;
(void) cv_reltimedwait(&emul64_yield_cv, &emul64_yield_mutex,
ticks, TR_CLOCK_TICK);
emul64_io_count = 0;
emul64_waiting = FALSE;
/* Broadcast in case others are waiting. */
cv_broadcast(&emul64_yield_cv);
}
mutex_exit(&emul64_yield_mutex);
}