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freebsd-skq/sys/dev/twe/twe.c
msmith be8339b765 Typo fix; use & to test for bits set in the status register. 
Submitted by:	Joel Jacobson <jake@3ware.com>
2001-02-26 20:13:19 +00:00

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/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* 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.
*
* $FreeBSD$
*/
/*
* Driver for the 3ware Escalade family of IDE RAID controllers.
*/
#include <dev/twe/twe_compat.h>
#include <dev/twe/twereg.h>
#include <dev/twe/tweio.h>
#include <dev/twe/twevar.h>
#define TWE_DEFINE_TABLES
#include <dev/twe/twe_tables.h>
/*
* Command submission.
*/
static int twe_get_param_1(struct twe_softc *sc, int table_id, int param_id, u_int8_t *result);
static int twe_get_param_2(struct twe_softc *sc, int table_id, int param_id, u_int16_t *result);
static int twe_get_param_4(struct twe_softc *sc, int table_id, int param_id, u_int32_t *result);
static void *twe_get_param(struct twe_softc *sc, int table_id, int parameter_id, size_t size,
void (* func)(struct twe_request *tr));
static int twe_set_param_1(struct twe_softc *sc, int table_id, int param_id, u_int8_t value);
static int twe_set_param_2(struct twe_softc *sc, int table_id, int param_id, u_int16_t value);
static int twe_set_param_4(struct twe_softc *sc, int table_id, int param_id, u_int32_t value);
static int twe_set_param(struct twe_softc *sc, int table_id, int param_id, int param_size,
void *data);
static int twe_init_connection(struct twe_softc *sc, int mode);
static int twe_wait_request(struct twe_request *tr);
static int twe_immediate_request(struct twe_request *tr);
static void twe_completeio(struct twe_request *tr);
static void twe_reset(struct twe_softc *sc);
/*
* Command I/O to controller.
*/
static int twe_start(struct twe_request *tr);
static void twe_done(struct twe_softc *sc);
static void twe_complete(struct twe_softc *sc);
static int twe_wait_status(struct twe_softc *sc, u_int32_t status, int timeout);
static int twe_drain_response_queue(struct twe_softc *sc);
static int twe_check_bits(struct twe_softc *sc, u_int32_t status_reg);
static int twe_soft_reset(struct twe_softc *sc);
/*
* Interrupt handling.
*/
static void twe_host_intr(struct twe_softc *sc);
static void twe_attention_intr(struct twe_softc *sc);
static void twe_command_intr(struct twe_softc *sc);
/*
* Asynchronous event handling.
*/
static int twe_fetch_aen(struct twe_softc *sc);
static void twe_handle_aen(struct twe_request *tr);
static void twe_enqueue_aen(struct twe_softc *sc, u_int16_t aen);
static int twe_dequeue_aen(struct twe_softc *sc);
static int twe_drain_aen_queue(struct twe_softc *sc);
static int twe_find_aen(struct twe_softc *sc, u_int16_t aen);
/*
* Command buffer management.
*/
static int twe_get_request(struct twe_softc *sc, struct twe_request **tr);
static void twe_release_request(struct twe_request *tr);
/*
* Debugging.
*/
static char *twe_format_aen(struct twe_softc *sc, u_int16_t aen);
static int twe_report_request(struct twe_request *tr);
static void twe_panic(struct twe_softc *sc, char *reason);
/********************************************************************************
********************************************************************************
Public Interfaces
********************************************************************************
********************************************************************************/
/********************************************************************************
* Initialise the controller, set up driver data structures.
*/
int
twe_setup(struct twe_softc *sc)
{
struct twe_request *tr;
int i;
debug_called(4);
/*
* Initialise request queues.
*/
twe_initq_free(sc);
twe_initq_bio(sc);
twe_initq_ready(sc);
twe_initq_busy(sc);
twe_initq_complete(sc);
sc->twe_wait_aen = -1;
/*
* Allocate request structures up front.
*/
for (i = 0; i < TWE_Q_LENGTH; i++) {
if ((tr = twe_allocate_request(sc)) == NULL)
return(ENOMEM);
/*
* Set global defaults that won't change.
*/
tr->tr_command.generic.host_id = sc->twe_host_id; /* controller-assigned host ID */
tr->tr_command.generic.request_id = i; /* our index number */
sc->twe_lookup[i] = tr;
/*
* Put command onto the freelist.
*/
twe_release_request(tr);
}
/*
* Wait for the controller to come ready.
*/
if (twe_wait_status(sc, TWE_STATUS_MICROCONTROLLER_READY, 60)) {
twe_printf(sc, "microcontroller not ready\n");
return(ENXIO);
}
/*
* Disable interrupts from the card.
*/
twe_disable_interrupts(sc);
/*
* Soft reset the controller, look for the AEN acknowledging the reset,
* check for errors, drain the response queue.
*/
for (i = 0; i < TWE_MAX_RESET_TRIES; i++) {
if (i > 0)
twe_printf(sc, "reset %d failed, trying again\n", i);
if (!twe_soft_reset(sc))
break; /* reset process complete */
}
/* did we give up? */
if (i >= TWE_MAX_RESET_TRIES) {
twe_printf(sc, "can't initialise controller, giving up\n");
return(ENXIO);
}
return(0);
}
/********************************************************************************
* Locate disk devices and attach children to them.
*/
void
twe_init(struct twe_softc *sc)
{
struct twe_drive *dr;
int i, table;
u_int16_t dsize;
TWE_Param *drives, *param;
TWE_Unit_Descriptor *ud;
/*
* The controller is in a safe state, so try to find drives attached to it.
*/
if ((drives = twe_get_param(sc, TWE_PARAM_UNITSUMMARY, TWE_PARAM_UNITSUMMARY_Status,
TWE_MAX_UNITS, NULL)) == NULL) {
twe_printf(sc, "can't detect attached units\n");
return;
}
/*
* For each detected unit, create a child device.
*/
for (i = 0, dr = &sc->twe_drive[0]; i < TWE_MAX_UNITS; i++, dr++) {
/* check that the drive is online */
if (!(drives->data[i] & TWE_PARAM_UNITSTATUS_Online))
continue;
table = TWE_PARAM_UNITINFO + i;
if (twe_get_param_4(sc, table, TWE_PARAM_UNITINFO_Capacity, &dr->td_size)) {
twe_printf(sc, "error fetching capacity for unit %d\n", i);
continue;
}
if (twe_get_param_1(sc, table, TWE_PARAM_UNITINFO_Status, &dr->td_state)) {
twe_printf(sc, "error fetching state for unit %d\n", i);
continue;
}
if (twe_get_param_2(sc, table, TWE_PARAM_UNITINFO_DescriptorSize, &dsize)) {
twe_printf(sc, "error fetching descriptor size for unit %d\n", i);
continue;
}
if ((param = twe_get_param(sc, table, TWE_PARAM_UNITINFO_Descriptor, dsize - 3, NULL)) == NULL) {
twe_printf(sc, "error fetching descriptor for unit %d\n", i);
continue;
}
ud = (TWE_Unit_Descriptor *)param->data;
dr->td_type = ud->configuration;
free(param, M_DEVBUF);
/* build synthetic geometry as per controller internal rules */
if (dr->td_size > 0x200000) {
dr->td_heads = 255;
dr->td_sectors = 63;
} else {
dr->td_heads = 64;
dr->td_sectors = 32;
}
dr->td_cylinders = dr->td_size / (dr->td_heads * dr->td_sectors);
dr->td_unit = i;
twe_attach_drive(sc, dr);
}
free(drives, M_DEVBUF);
/*
* Initialise connection with controller.
*/
twe_init_connection(sc, TWE_INIT_MESSAGE_CREDITS);
#ifdef TWE_SHUTDOWN_NOTIFICATION
/*
* Tell the controller we support shutdown notification.
*/
twe_set_param_1(sc, TWE_PARAM_FEATURES, TWE_PARAM_FEATURES_DriverShutdown, 1);
#endif
/*
* Mark controller up and ready to run.
*/
sc->twe_state &= ~TWE_STATE_SHUTDOWN;
/*
* Finally enable interrupts.
*/
twe_enable_interrupts(sc);
}
/********************************************************************************
* Stop the controller
*/
void
twe_deinit(struct twe_softc *sc)
{
/*
* Mark the controller as shutting down, and disable any further interrupts.
*/
sc->twe_state |= TWE_STATE_SHUTDOWN;
twe_disable_interrupts(sc);
#ifdef TWE_SHUTDOWN_NOTIFICATION
/*
* Disconnect from the controller
*/
twe_init_connection(sc, TWE_SHUTDOWN_MESSAGE_CREDITS);
#endif
}
/*******************************************************************************
* Take an interrupt, or be poked by other code to look for interrupt-worthy
* status.
*/
void
twe_intr(struct twe_softc *sc)
{
u_int32_t status_reg;
debug_called(4);
/*
* Collect current interrupt status.
*/
status_reg = TWE_STATUS(sc);
twe_check_bits(sc, status_reg);
/*
* Dispatch based on interrupt status
*/
if (status_reg & TWE_STATUS_HOST_INTERRUPT)
twe_host_intr(sc);
if (status_reg & TWE_STATUS_ATTENTION_INTERRUPT)
twe_attention_intr(sc);
if (status_reg & TWE_STATUS_COMMAND_INTERRUPT)
twe_command_intr(sc);
if (status_reg & TWE_STATUS_RESPONSE_INTERRUPT)
twe_done(sc);
};
/********************************************************************************
* Pull as much work off the softc's work queue as possible and give it to the
* controller.
*/
void
twe_startio(struct twe_softc *sc)
{
struct twe_request *tr;
TWE_Command *cmd;
twe_bio *bp;
int error;
debug_called(4);
/* spin until something prevents us from doing any work */
for (;;) {
/* try to get a command that's already ready to go */
tr = twe_dequeue_ready(sc);
/* build a command from an outstanding bio */
if (tr == NULL) {
/* see if there's work to be done */
if ((bp = twe_dequeue_bio(sc)) == NULL)
break;
/* get a command to handle the bio with */
if (twe_get_request(sc, &tr)) {
twe_enqueue_bio(sc, bp); /* failed, put the bio back */
break;
}
/* connect the bio to the command */
tr->tr_complete = twe_completeio;
tr->tr_private = bp;
tr->tr_data = TWE_BIO_DATA(bp);
tr->tr_length = TWE_BIO_LENGTH(bp);
cmd = &tr->tr_command;
if (TWE_BIO_IS_READ(bp)) {
tr->tr_flags |= TWE_CMD_DATAIN;
cmd->io.opcode = TWE_OP_READ;
} else {
tr->tr_flags |= TWE_CMD_DATAOUT;
cmd->io.opcode = TWE_OP_WRITE;
}
/* build a suitable I/O command (assumes 512-byte rounded transfers) */
cmd->io.size = 3;
cmd->io.unit = TWE_BIO_UNIT(bp);
cmd->io.block_count = (tr->tr_length + TWE_BLOCK_SIZE - 1) / TWE_BLOCK_SIZE;
cmd->io.lba = TWE_BIO_LBA(bp);
/* map the command so the controller can work with it */
twe_map_request(tr);
}
/* did we find something to do? */
if (tr == NULL)
break;
/* try to give command to controller */
error = twe_start(tr);
if (error != 0) {
if (error == EBUSY) {
twe_requeue_ready(tr); /* try it again later */
break; /* don't try anything more for now */
}
/* we don't support any other return from twe_start */
twe_panic(sc, "twe_start returned nonsense");
}
}
}
/********************************************************************************
* Write blocks from memory to disk, for system crash dumps.
*/
int
twe_dump_blocks(struct twe_softc *sc, int unit, u_int32_t lba, void *data, int nblks)
{
struct twe_request *tr;
TWE_Command *cmd;
int error;
if (twe_get_request(sc, &tr))
return(ENOMEM);
tr->tr_data = data;
tr->tr_status = TWE_CMD_SETUP;
tr->tr_length = nblks * TWE_BLOCK_SIZE;
tr->tr_flags = TWE_CMD_DATAOUT;
cmd = &tr->tr_command;
cmd->io.opcode = TWE_OP_WRITE;
cmd->io.size = 3;
cmd->io.unit = unit;
cmd->io.block_count = nblks;
cmd->io.lba = lba;
twe_map_request(tr);
error = twe_immediate_request(tr);
if (error == 0)
if (twe_report_request(tr))
error = EIO;
twe_release_request(tr);
return(error);
}
/********************************************************************************
* Handle controller-specific control operations.
*/
int
twe_ioctl(struct twe_softc *sc, int cmd, void *addr)
{
struct twe_usercommand *tu = (struct twe_usercommand *)addr;
struct twe_paramcommand *tp = (struct twe_paramcommand *)addr;
union twe_statrequest *ts = (union twe_statrequest *)addr;
TWE_Param *param;
void *data;
int *arg = (int *)addr;
struct twe_request *tr;
u_int8_t srid;
int s, error;
error = 0;
switch(cmd) {
/* handle a command from userspace */
case TWEIO_COMMAND:
/* get a request */
if (twe_get_request(sc, &tr)) {
error = EBUSY;
goto cmd_done;
}
/*
* Save the command's request ID, copy the user-supplied command in,
* restore the request ID.
*/
srid = tr->tr_command.generic.request_id;
bcopy(&tu->tu_command, &tr->tr_command, sizeof(TWE_Command));
tr->tr_command.generic.request_id = srid;
/* if there's a data buffer, allocate and copy it in */
tr->tr_length = tu->tu_size;
if (tr->tr_length > 0) {
if ((tr->tr_data = malloc(tr->tr_length, M_DEVBUF, M_WAITOK)) == NULL) {
error = ENOMEM;
goto cmd_done;
}
if ((error = copyin(tu->tu_data, tr->tr_data, tr->tr_length)) != 0)
goto cmd_done;
tr->tr_flags |= TWE_CMD_DATAIN | TWE_CMD_DATAOUT;
}
/* run the command */
twe_map_request(tr);
twe_wait_request(tr);
/* copy the command out again */
bcopy(&tr->tr_command, &tu->tu_command, sizeof(TWE_Command));
/* if there was a data buffer, copy it out */
if (tr->tr_length > 0)
error = copyout(tr->tr_data, tu->tu_data, tr->tr_length);
cmd_done:
/* free resources */
if (tr->tr_data != NULL)
free(tr->tr_data, M_DEVBUF);
if (tr != NULL)
twe_release_request(tr);
break;
/* fetch statistics counter */
case TWEIO_STATS:
switch (ts->ts_item) {
#ifdef TWE_PERFORMANCE_MONITOR
case TWEQ_FREE:
case TWEQ_BIO:
case TWEQ_READY:
case TWEQ_BUSY:
case TWEQ_COMPLETE:
bcopy(&sc->twe_qstat[ts->ts_item], &ts->ts_qstat, sizeof(struct twe_qstat));
break;
#endif
default:
error = ENOENT;
break;
}
break;
/* poll for an AEN */
case TWEIO_AEN_POLL:
*arg = twe_dequeue_aen(sc);
if (*arg == -1)
error = ENOENT;
break;
/* wait for another AEN to show up */
case TWEIO_AEN_WAIT:
s = splbio();
while ((*arg = twe_dequeue_aen(sc)) == -1) {
error = tsleep(&sc->twe_aen_queue, PRIBIO | PCATCH, "tweaen", 0);
if (error == EINTR)
break;
}
splx(s);
break;
case TWEIO_GET_PARAM:
if ((param = twe_get_param(sc, tp->tp_table_id, tp->tp_param_id, tp->tp_size, NULL)) == NULL) {
twe_printf(sc, "TWEIO_GET_PARAM failed for 0x%x/0x%x/%d\n",
tp->tp_table_id, tp->tp_param_id, tp->tp_size);
error = EINVAL;
} else {
if (param->parameter_size_bytes > tp->tp_size) {
twe_printf(sc, "TWEIO_GET_PARAM parameter too large (%d > %d)\n",
param->parameter_size_bytes, tp->tp_size);
error = EFAULT;
} else {
error = copyout(param->data, tp->tp_data, param->parameter_size_bytes);
}
free(param, M_DEVBUF);
}
break;
case TWEIO_SET_PARAM:
if ((data = malloc(tp->tp_size, M_DEVBUF, M_WAITOK)) == NULL) {
error = ENOMEM;
} else {
error = copyin(tp->tp_data, data, tp->tp_size);
if (error == 0)
error = twe_set_param(sc, tp->tp_table_id, tp->tp_param_id, tp->tp_size, data);
free(data, M_DEVBUF);
}
break;
case TWEIO_RESET:
twe_reset(sc);
break;
/* nothing we understand */
default:
error = ENOTTY;
}
return(error);
}
/********************************************************************************
* Enable the useful interrupts from the controller.
*/
void
twe_enable_interrupts(struct twe_softc *sc)
{
sc->twe_state |= TWE_STATE_INTEN;
TWE_CONTROL(sc,
TWE_CONTROL_CLEAR_ATTENTION_INTERRUPT |
TWE_CONTROL_UNMASK_RESPONSE_INTERRUPT |
TWE_CONTROL_ENABLE_INTERRUPTS);
}
/********************************************************************************
* Disable interrupts from the controller.
*/
void
twe_disable_interrupts(struct twe_softc *sc)
{
TWE_CONTROL(sc, TWE_CONTROL_DISABLE_INTERRUPTS);
sc->twe_state &= ~TWE_STATE_INTEN;
}
/********************************************************************************
********************************************************************************
Command Submission
********************************************************************************
********************************************************************************/
/********************************************************************************
* Read integer parameter table entries.
*/
static int
twe_get_param_1(struct twe_softc *sc, int table_id, int param_id, u_int8_t *result)
{
TWE_Param *param;
if ((param = twe_get_param(sc, table_id, param_id, 1, NULL)) == NULL)
return(ENOENT);
*result = *(u_int8_t *)param->data;
free(param, M_DEVBUF);
return(0);
}
static int
twe_get_param_2(struct twe_softc *sc, int table_id, int param_id, u_int16_t *result)
{
TWE_Param *param;
if ((param = twe_get_param(sc, table_id, param_id, 2, NULL)) == NULL)
return(ENOENT);
*result = *(u_int16_t *)param->data;
free(param, M_DEVBUF);
return(0);
}
static int
twe_get_param_4(struct twe_softc *sc, int table_id, int param_id, u_int32_t *result)
{
TWE_Param *param;
if ((param = twe_get_param(sc, table_id, param_id, 4, NULL)) == NULL)
return(ENOENT);
*result = *(u_int32_t *)param->data;
free(param, M_DEVBUF);
return(0);
}
/********************************************************************************
* Perform a TWE_OP_GET_PARAM command. If a callback function is provided, it
* will be called with the command when it's completed. If no callback is
* provided, we will wait for the command to complete and then return just the data.
* The caller is responsible for freeing the data when done with it.
*/
static void *
twe_get_param(struct twe_softc *sc, int table_id, int param_id, size_t param_size,
void (* func)(struct twe_request *tr))
{
struct twe_request *tr;
TWE_Command *cmd;
TWE_Param *param;
int error;
debug_called(4);
tr = NULL;
param = NULL;
/* get a command */
if (twe_get_request(sc, &tr))
goto err;
/* get a buffer */
if ((param = (TWE_Param *)malloc(TWE_SECTOR_SIZE, M_DEVBUF, M_NOWAIT)) == NULL)
goto err;
tr->tr_data = param;
tr->tr_length = TWE_SECTOR_SIZE;
tr->tr_flags = TWE_CMD_DATAIN | TWE_CMD_DATAOUT;
/* build the command for the controller */
cmd = &tr->tr_command;
cmd->param.opcode = TWE_OP_GET_PARAM;
cmd->param.size = 2;
cmd->param.unit = 0;
cmd->param.param_count = 1;
/* map the command/data into controller-visible space */
twe_map_request(tr);
/* fill in the outbound parameter data */
param->table_id = table_id;
param->parameter_id = param_id;
param->parameter_size_bytes = param_size;
/* submit the command and either wait or let the callback handle it */
if (func == NULL) {
/* XXX could use twe_wait_request here if interrupts were enabled? */
error = twe_immediate_request(tr);
if (error == 0) {
if (twe_report_request(tr))
goto err;
}
twe_release_request(tr);
return(param);
} else {
tr->tr_complete = func;
error = twe_start(tr);
if (error == 0)
return(func);
}
/* something failed */
err:
debug(1, "failed");
if (tr != NULL)
twe_release_request(tr);
if (param != NULL)
free(param, M_DEVBUF);
return(NULL);
}
/********************************************************************************
* Set integer parameter table entries.
*/
static int
twe_set_param_1(struct twe_softc *sc, int table_id, int param_id, u_int8_t value)
{
return(twe_set_param(sc, table_id, param_id, sizeof(value), &value));
}
static int
twe_set_param_2(struct twe_softc *sc, int table_id, int param_id, u_int16_t value)
{
return(twe_set_param(sc, table_id, param_id, sizeof(value), &value));
}
static int
twe_set_param_4(struct twe_softc *sc, int table_id, int param_id, u_int32_t value)
{
return(twe_set_param(sc, table_id, param_id, sizeof(value), &value));
}
/********************************************************************************
* Perform a TWE_OP_SET_PARAM command, returns nonzero on error.
*/
static int
twe_set_param(struct twe_softc *sc, int table_id, int param_id, int param_size, void *data)
{
struct twe_request *tr;
TWE_Command *cmd;
TWE_Param *param;
int error;
debug_called(4);
tr = NULL;
param = NULL;
error = ENOMEM;
/* get a command */
if (twe_get_request(sc, &tr))
goto out;
/* get a buffer */
if ((param = (TWE_Param *)malloc(TWE_SECTOR_SIZE, M_DEVBUF, M_NOWAIT)) == NULL)
goto out;
tr->tr_data = param;
tr->tr_length = TWE_SECTOR_SIZE;
tr->tr_flags = TWE_CMD_DATAIN | TWE_CMD_DATAOUT;
/* build the command for the controller */
cmd = &tr->tr_command;
cmd->param.opcode = TWE_OP_SET_PARAM;
cmd->param.size = 2;
cmd->param.unit = 0;
cmd->param.param_count = 1;
/* map the command/data into controller-visible space */
twe_map_request(tr);
/* fill in the outbound parameter data */
param->table_id = table_id;
param->parameter_id = param_id;
param->parameter_size_bytes = param_size;
bcopy(data, param->data, param_size);
/* XXX could use twe_wait_request here if interrupts were enabled? */
error = twe_immediate_request(tr);
if (error == 0) {
if (twe_report_request(tr))
error = EIO;
}
out:
if (tr != NULL)
twe_release_request(tr);
if (param != NULL)
free(param, M_DEVBUF);
return(error);
}
/********************************************************************************
* Perform a TWE_OP_INIT_CONNECTION command, returns nonzero on error.
*
* Typically called with interrupts disabled.
*/
static int
twe_init_connection(struct twe_softc *sc, int mode)
{
struct twe_request *tr;
TWE_Command *cmd;
int error;
debug_called(4);
/* get a command */
if (twe_get_request(sc, &tr))
return(NULL);
/* build the command */
cmd = &tr->tr_command;
cmd->initconnection.opcode = TWE_OP_INIT_CONNECTION;
cmd->initconnection.size = 3;
cmd->initconnection.host_id = 0;
cmd->initconnection.message_credits = mode;
cmd->initconnection.response_queue_pointer = 0;
/* map the command into controller-visible space */
twe_map_request(tr);
/* submit the command */
error = twe_immediate_request(tr);
/* XXX check command result? */
twe_unmap_request(tr);
twe_release_request(tr);
if (mode == TWE_INIT_MESSAGE_CREDITS)
sc->twe_host_id = cmd->initconnection.host_id;
return(error);
}
/********************************************************************************
* Start the command (tr) and sleep waiting for it to complete.
*
* Successfully completed commands are dequeued.
*/
static int
twe_wait_request(struct twe_request *tr)
{
int s;
debug_called(4);
tr->tr_flags |= TWE_CMD_SLEEPER;
tr->tr_status = TWE_CMD_BUSY;
twe_enqueue_ready(tr);
twe_startio(tr->tr_sc);
s = splbio();
while (tr->tr_status == TWE_CMD_BUSY)
tsleep(tr, PRIBIO, "twewait", 0);
splx(s);
return(0);
}
/********************************************************************************
* Start the command (tr) and busy-wait for it to complete.
* This should only be used when interrupts are actually disabled (although it
* will work if they are not).
*/
static int
twe_immediate_request(struct twe_request *tr)
{
int error;
debug_called(4);
error = 0;
if ((error = twe_start(tr)) != 0)
return(error);
while (tr->tr_status == TWE_CMD_BUSY){
twe_done(tr->tr_sc);
}
return(tr->tr_status != TWE_CMD_COMPLETE);
}
/********************************************************************************
* Handle completion of an I/O command.
*/
static void
twe_completeio(struct twe_request *tr)
{
struct twe_softc *sc = tr->tr_sc;
twe_bio *bp = (twe_bio *)tr->tr_private;
debug_called(4);
if (tr->tr_status == TWE_CMD_COMPLETE) {
if (twe_report_request(tr))
TWE_BIO_SET_ERROR(bp, EIO);
} else {
twe_panic(sc, "twe_completeio on incomplete command");
}
tr->tr_private = NULL;
twed_intr(bp);
twe_release_request(tr);
}
/********************************************************************************
* Reset the controller and pull all the active commands back onto the ready
* queue. Used to restart a controller that's exhibiting bad behaviour.
*/
static void
twe_reset(struct twe_softc *sc)
{
struct twe_request *tr;
int i, s;
twe_printf(sc, "controller reset in progress...\n");
/*
* Disable interrupts from the controller, and mask any accidental entry
* into our interrupt handler.
*/
twe_disable_interrupts(sc);
s = splbio();
/*
* Try to soft-reset the controller.
*/
for (i = 0; i < TWE_MAX_RESET_TRIES; i++) {
if (i > 0)
twe_printf(sc, "reset %d failed, trying again\n", i);
if (!twe_soft_reset(sc))
break; /* reset process complete */
}
/* did we give up? */
if (i >= TWE_MAX_RESET_TRIES) {
twe_printf(sc, "can't reset controller, giving up\n");
goto out;
}
/*
* Move all of the commands that were busy back to the ready queue.
*/
i = 0;
while ((tr = twe_dequeue_busy(sc)) != NULL) {
twe_enqueue_ready(tr);
i++;
}
/*
* Kick the controller to start things going again, then re-enable interrupts.
*/
twe_startio(sc);
twe_enable_interrupts(sc);
twe_printf(sc, "controller reset done, %d commands restarted\n", i);
out:
splx(s);
twe_enable_interrupts(sc);
}
/********************************************************************************
********************************************************************************
Command I/O to Controller
********************************************************************************
********************************************************************************/
/********************************************************************************
* Try to deliver (tr) to the controller.
*
* Can be called at any interrupt level, with or without interrupts enabled.
*/
static int
twe_start(struct twe_request *tr)
{
struct twe_softc *sc = tr->tr_sc;
int i, s, done;
u_int32_t status_reg;
debug_called(4);
/* mark the command as currently being processed */
tr->tr_status = TWE_CMD_BUSY;
/*
* Spin briefly waiting for the controller to come ready
*
* XXX it might be more efficient to return EBUSY immediately
* and let the command be rescheduled.
*/
for (i = 100000, done = 0; (i > 0) && !done; i--) {
s = splbio();
/* check to see if we can post a command */
status_reg = TWE_STATUS(sc);
twe_check_bits(sc, status_reg);
if (!(status_reg & TWE_STATUS_COMMAND_QUEUE_FULL)) {
TWE_COMMAND_QUEUE(sc, tr->tr_cmdphys);
done = 1;
/* move command to work queue */
twe_enqueue_busy(tr);
#ifdef TWE_DEBUG
if (tr->tr_complete != NULL) {
debug(3, "queued request %d with callback %p", tr->tr_command.generic.request_id, tr->tr_complete);
} else if (tr->tr_flags & TWE_CMD_SLEEPER) {
debug(3, "queued request %d with wait channel %p", tr->tr_command.generic.request_id, tr);
} else {
debug(3, "queued request %d for polling caller", tr->tr_command.generic.request_id);
}
#endif
}
splx(s); /* drop spl to allow completion interrupts */
}
/* command is enqueued */
if (done)
return(0);
/*
* We couldn't get the controller to take the command; try submitting it again later.
* This should only happen if something is wrong with the controller, or if we have
* overestimated the number of commands it can accept. (Should we actually reject
* the command at this point?)
*/
return(EBUSY);
}
/********************************************************************************
* Poll the controller (sc) for completed commands.
*
* Can be called at any interrupt level, with or without interrupts enabled.
*/
static void
twe_done(struct twe_softc *sc)
{
TWE_Response_Queue rq;
struct twe_request *tr;
int s, found;
u_int32_t status_reg;
debug_called(5);
/* loop collecting completed commands */
found = 0;
s = splbio();
for (;;) {
status_reg = TWE_STATUS(sc);
twe_check_bits(sc, status_reg); /* XXX should this fail? */
if (!(status_reg & TWE_STATUS_RESPONSE_QUEUE_EMPTY)) {
found = 1;
rq = TWE_RESPONSE_QUEUE(sc);
tr = sc->twe_lookup[rq.u.response_id]; /* find command */
if (tr->tr_status != TWE_CMD_BUSY)
twe_printf(sc, "completion event for nonbusy command\n");
tr->tr_status = TWE_CMD_COMPLETE;
debug(3, "completed request id %d with status %d",
tr->tr_command.generic.request_id, tr->tr_command.generic.status);
/* move to completed queue */
twe_remove_busy(tr);
twe_enqueue_complete(tr);
} else {
break; /* no response ready */
}
}
splx(s);
/* if we've completed any commands, try posting some more */
if (found)
twe_startio(sc);
/* handle completion and timeouts */
twe_complete(sc); /* XXX use deferred completion? */
}
/********************************************************************************
* Perform post-completion processing for commands on (sc).
*
* This is split from twe_done as it can be safely deferred and run at a lower
* priority level should facilities for such a thing become available.
*/
static void
twe_complete(struct twe_softc *sc)
{
struct twe_request *tr;
debug_called(5);
/*
* Pull commands off the completed list, dispatch them appropriately
*/
while ((tr = twe_dequeue_complete(sc)) != NULL) {
/* unmap the command's data buffer */
twe_unmap_request(tr);
/* dispatch to suit command originator */
if (tr->tr_complete != NULL) { /* completion callback */
debug(2, "call completion handler %p", tr->tr_complete);
tr->tr_complete(tr);
} else if (tr->tr_flags & TWE_CMD_SLEEPER) { /* caller is asleep waiting */
debug(2, "wake up command owner on %p", tr);
wakeup_one(tr);
} else { /* caller is polling command */
debug(2, "command left for owner");
}
}
}
/********************************************************************************
* Wait for (status) to be set in the controller status register for up to
* (timeout) seconds. Returns 0 if found, nonzero if we time out.
*
* Note: this busy-waits, rather than sleeping, since we may be called with
* eg. clock interrupts masked.
*/
static int
twe_wait_status(struct twe_softc *sc, u_int32_t status, int timeout)
{
time_t expiry;
u_int32_t status_reg;
debug_called(4);
expiry = time_second + timeout;
do {
status_reg = TWE_STATUS(sc);
if (status_reg & status) /* got the required bit(s)? */
return(0);
DELAY(100000);
} while (time_second <= expiry);
return(1);
}
/********************************************************************************
* Drain the response queue, which may contain responses to commands we know
* nothing about.
*/
static int
twe_drain_response_queue(struct twe_softc *sc)
{
TWE_Response_Queue rq;
u_int32_t status_reg;
debug_called(4);
for (;;) { /* XXX give up eventually? */
status_reg = TWE_STATUS(sc);
if (twe_check_bits(sc, status_reg))
return(1);
if (status_reg & TWE_STATUS_RESPONSE_QUEUE_EMPTY)
return(0);
rq = TWE_RESPONSE_QUEUE(sc);
}
}
/********************************************************************************
* Soft-reset the controller
*/
static int
twe_soft_reset(struct twe_softc *sc)
{
u_int32_t status_reg;
debug_called(2);
TWE_SOFT_RESET(sc);
if (twe_wait_status(sc, TWE_STATUS_ATTENTION_INTERRUPT, 15)) {
twe_printf(sc, "no attention interrupt\n");
return(1);
}
if (twe_drain_aen_queue(sc)) {
twe_printf(sc, "can't drain AEN queue\n");
return(1);
}
if (twe_find_aen(sc, TWE_AEN_SOFT_RESET)) {
twe_printf(sc, "reset not reported\n");
return(1);
}
status_reg = TWE_STATUS(sc);
if (TWE_STATUS_ERRORS(status_reg) || twe_check_bits(sc, status_reg)) {
twe_printf(sc, "controller errors detected\n");
return(1);
}
if (twe_drain_response_queue(sc)) {
twe_printf(sc, "can't drain response queue\n");
return(1);
}
return(0);
}
/********************************************************************************
********************************************************************************
Interrupt Handling
********************************************************************************
********************************************************************************/
/********************************************************************************
* Host interrupt.
*
* XXX what does this mean?
*/
static void
twe_host_intr(struct twe_softc *sc)
{
debug_called(4);
twe_printf(sc, "host interrupt\n");
TWE_CONTROL(sc, TWE_CONTROL_CLEAR_HOST_INTERRUPT);
}
/********************************************************************************
* Attention interrupt.
*
* Signalled when the controller has one or more AENs for us.
*/
static void
twe_attention_intr(struct twe_softc *sc)
{
debug_called(4);
/* instigate a poll for AENs */
if (twe_fetch_aen(sc)) {
twe_printf(sc, "error polling for signalled AEN\n");
} else {
TWE_CONTROL(sc, TWE_CONTROL_CLEAR_ATTENTION_INTERRUPT);
}
}
/********************************************************************************
* Command interrupt.
*
* Signalled when the controller can handle more commands.
*/
static void
twe_command_intr(struct twe_softc *sc)
{
debug_called(4);
/*
* We don't use this, rather we try to submit commands when we receive
* them, and when other commands have completed. Mask it so we don't get
* another one.
*/
twe_printf(sc, "command interrupt\n");
TWE_CONTROL(sc, TWE_CONTROL_MASK_COMMAND_INTERRUPT);
}
/********************************************************************************
********************************************************************************
Asynchronous Event Handling
********************************************************************************
********************************************************************************/
/********************************************************************************
* Request an AEN from the controller.
*/
static int
twe_fetch_aen(struct twe_softc *sc)
{
debug_called(4);
if ((twe_get_param(sc, TWE_PARAM_AEN, TWE_PARAM_AEN_UnitCode, 2, twe_handle_aen)) == NULL)
return(EIO);
return(0);
}
/********************************************************************************
* Handle an AEN returned by the controller.
*/
static void
twe_handle_aen(struct twe_request *tr)
{
struct twe_softc *sc = tr->tr_sc;
TWE_Param *param;
u_int16_t aen;
debug_called(4);
/* XXX check for command success somehow? */
param = (TWE_Param *)tr->tr_data;
aen = *(u_int16_t *)(param->data);
free(tr->tr_data, M_DEVBUF);
twe_release_request(tr);
twe_enqueue_aen(sc, aen);
/* XXX poll for more AENs? */
}
/********************************************************************************
* Pull AENs out of the controller and park them in the queue, in a context where
* interrupts aren't active. Return nonzero if we encounter any errors in the
* process of obtaining all the available AENs.
*/
static int
twe_drain_aen_queue(struct twe_softc *sc)
{
u_int16_t aen;
for (;;) {
if (twe_get_param_2(sc, TWE_PARAM_AEN, TWE_PARAM_AEN_UnitCode, &aen))
return(1);
if (aen == TWE_AEN_QUEUE_EMPTY)
return(0);
twe_enqueue_aen(sc, aen);
}
}
/********************************************************************************
* Push an AEN that we've received onto the queue.
*
* Note that we have to lock this against reentrance, since it may be called
* from both interrupt and non-interrupt context.
*
* If someone is waiting for the AEN we have, wake them up.
*/
static void
twe_enqueue_aen(struct twe_softc *sc, u_int16_t aen)
{
char *msg;
int s, next, nextnext;
debug_called(4);
if ((msg = twe_format_aen(sc, aen)) != NULL)
twe_printf(sc, "AEN: <%s>\n", msg);
s = splbio();
/* enqueue the AEN */
next = ((sc->twe_aen_head + 1) % TWE_Q_LENGTH);
nextnext = ((sc->twe_aen_head + 2) % TWE_Q_LENGTH);
/* check to see if this is the last free slot, and subvert the AEN if it is */
if (nextnext == sc->twe_aen_tail)
aen = TWE_AEN_QUEUE_FULL;
/* look to see if there's room for this AEN */
if (next != sc->twe_aen_tail) {
sc->twe_aen_queue[sc->twe_aen_head] = aen;
sc->twe_aen_head = next;
}
/* wake up anyone asleep on the queue */
wakeup(&sc->twe_aen_queue);
/* anyone looking for this AEN? */
if (sc->twe_wait_aen == aen) {
sc->twe_wait_aen = -1;
wakeup(&sc->twe_wait_aen);
}
splx(s);
}
/********************************************************************************
* Pop an AEN off the queue, or return -1 if there are none left.
*
* We are more or less interrupt-safe, so don't block interrupts.
*/
static int
twe_dequeue_aen(struct twe_softc *sc)
{
int result;
debug_called(4);
if (sc->twe_aen_tail == sc->twe_aen_head) {
result = -1;
} else {
result = sc->twe_aen_queue[sc->twe_aen_tail];
sc->twe_aen_tail = ((sc->twe_aen_tail + 1) % TWE_Q_LENGTH);
}
return(result);
}
/********************************************************************************
* Check to see if the requested AEN is in the queue.
*
* XXX we could probably avoid masking interrupts here
*/
static int
twe_find_aen(struct twe_softc *sc, u_int16_t aen)
{
int i, s, missing;
missing = 1;
s = splbio();
for (i = sc->twe_aen_tail; (i != sc->twe_aen_head) && missing; i = (i + 1) % TWE_Q_LENGTH) {
if (sc->twe_aen_queue[i] == aen)
missing = 0;
}
splx(s);
return(missing);
}
#if 0 /* currently unused */
/********************************************************************************
* Sleep waiting for at least (timeout) seconds until we see (aen) as
* requested. Returns nonzero on timeout or failure.
*
* XXX: this should not be used in cases where there may be more than one sleeper
* without a mechanism for registering multiple sleepers.
*/
static int
twe_wait_aen(struct twe_softc *sc, int aen, int timeout)
{
time_t expiry;
int found, s;
debug_called(4);
expiry = time_second + timeout;
found = 0;
s = splbio();
sc->twe_wait_aen = aen;
do {
twe_fetch_aen(sc);
tsleep(&sc->twe_wait_aen, PZERO, "twewaen", hz);
if (sc->twe_wait_aen == -1)
found = 1;
} while ((time_second <= expiry) && !found);
splx(s);
return(!found);
}
#endif
/********************************************************************************
********************************************************************************
Command Buffer Management
********************************************************************************
********************************************************************************/
/********************************************************************************
* Get a new command buffer.
*
* This will return NULL if all command buffers are in use.
*/
static int
twe_get_request(struct twe_softc *sc, struct twe_request **tr)
{
debug_called(4);
/* try to reuse an old buffer */
*tr = twe_dequeue_free(sc);
/* initialise some fields to their defaults */
if (*tr != NULL) {
(*tr)->tr_data = NULL;
(*tr)->tr_private = NULL;
(*tr)->tr_status = TWE_CMD_SETUP; /* command is in setup phase */
(*tr)->tr_flags = 0;
(*tr)->tr_complete = NULL;
(*tr)->tr_command.generic.status = 0; /* before submission to controller */
(*tr)->tr_command.generic.flags = 0; /* not used */
}
return(*tr == NULL);
}
/********************************************************************************
* Release a command buffer for reuse.
*
*/
static void
twe_release_request(struct twe_request *tr)
{
debug_called(4);
if (tr->tr_private != NULL)
twe_panic(tr->tr_sc, "tr_private != NULL");
twe_enqueue_free(tr);
}
/********************************************************************************
********************************************************************************
Debugging
********************************************************************************
********************************************************************************/
/********************************************************************************
* Print some information about the controller
*/
void
twe_describe_controller(struct twe_softc *sc)
{
TWE_Param *p[6];
u_int8_t ports;
u_int32_t size;
int i;
debug_called(2);
/* get the port count */
twe_get_param_1(sc, TWE_PARAM_CONTROLLER, TWE_PARAM_CONTROLLER_PortCount, &ports);
/* get version strings */
p[0] = twe_get_param(sc, TWE_PARAM_VERSION, TWE_PARAM_VERSION_Mon, 16, NULL);
p[1] = twe_get_param(sc, TWE_PARAM_VERSION, TWE_PARAM_VERSION_FW, 16, NULL);
p[2] = twe_get_param(sc, TWE_PARAM_VERSION, TWE_PARAM_VERSION_BIOS, 16, NULL);
p[3] = twe_get_param(sc, TWE_PARAM_VERSION, TWE_PARAM_VERSION_PCB, 8, NULL);
p[4] = twe_get_param(sc, TWE_PARAM_VERSION, TWE_PARAM_VERSION_ATA, 8, NULL);
p[5] = twe_get_param(sc, TWE_PARAM_VERSION, TWE_PARAM_VERSION_PCI, 8, NULL);
twe_printf(sc, "%d ports, Firmware %.16s, BIOS %.16s\n", ports, p[1]->data, p[2]->data);
if (bootverbose)
twe_printf(sc, "Monitor %.16s, PCB %.8s, Achip %.8s, Pchip %.8s\n", p[0]->data, p[3]->data,
p[4]->data, p[5]->data);
free(p[0], M_DEVBUF);
free(p[1], M_DEVBUF);
free(p[2], M_DEVBUF);
free(p[3], M_DEVBUF);
free(p[4], M_DEVBUF);
free(p[5], M_DEVBUF);
/* print attached drives */
if (bootverbose) {
p[0] = twe_get_param(sc, TWE_PARAM_DRIVESUMMARY, TWE_PARAM_DRIVESUMMARY_Status, 16, NULL);
for (i = 0; i < ports; i++) {
if (p[0]->data[i] != TWE_PARAM_DRIVESTATUS_Present)
continue;
twe_get_param_4(sc, TWE_PARAM_DRIVEINFO + i, TWE_PARAM_DRIVEINFO_Size, &size);
p[1] = twe_get_param(sc, TWE_PARAM_DRIVEINFO + i, TWE_PARAM_DRIVEINFO_Model, 40, NULL);
if (p[1] != NULL) {
twe_printf(sc, "port %d: %.40s %dMB\n", i, p[1]->data, size / 2048);
free(p[1], M_DEVBUF);
} else {
twe_printf(sc, "port %d, drive status unavailable\n", i);
}
}
free(p[0], M_DEVBUF);
}
}
/********************************************************************************
* Complain if the status bits aren't what we're expecting.
*
* Rate-limit the complaints to at most one of each every five seconds, but
* always return the correct status.
*/
static int
twe_check_bits(struct twe_softc *sc, u_int32_t status_reg)
{
int result;
static time_t lastwarn[2] = {0, 0};
/*
* This can be a little problematic, as twe_panic may call twe_reset if
* TWE_DEBUG is not set, which will call us again as part of the soft reset.
*/
if ((status_reg & TWE_STATUS_PANIC_BITS) != 0) {
twe_printf(sc, "FATAL STATUS BIT(S) %b\n", status_reg & TWE_STATUS_PANIC_BITS,
TWE_STATUS_BITS_DESCRIPTION);
twe_panic(sc, "fatal status bits");
}
result = 0;
if ((status_reg & TWE_STATUS_EXPECTED_BITS) != TWE_STATUS_EXPECTED_BITS) {
if (time_second > (lastwarn[0] + 5)) {
twe_printf(sc, "missing expected status bit(s) %b\n", ~status_reg & TWE_STATUS_EXPECTED_BITS,
TWE_STATUS_BITS_DESCRIPTION);
lastwarn[0] = time_second;
}
result = 1;
}
if ((status_reg & TWE_STATUS_UNEXPECTED_BITS) != 0) {
if (time_second > (lastwarn[1] + 5)) {
twe_printf(sc, "unexpected status bit(s) %b\n", status_reg & TWE_STATUS_UNEXPECTED_BITS,
TWE_STATUS_BITS_DESCRIPTION);
lastwarn[1] = time_second;
}
result = 1;
}
return(result);
}
/********************************************************************************
* Return a string describing (aen).
*
* The low 8 bits of the aen are the code, the high 8 bits give the unit number
* where an AEN is specific to a unit.
*
* Note that we could expand this routine to handle eg. up/downgrading the status
* of a drive if we had some idea of what the drive's initial status was.
*/
static char *
twe_format_aen(struct twe_softc *sc, u_int16_t aen)
{
static char buf[80];
device_t child;
char *code, *msg;
code = twe_describe_code(twe_table_aen, TWE_AEN_CODE(aen));
msg = code + 2;
switch (*code) {
case 'q':
if (!bootverbose)
return(NULL);
/* FALLTHROUGH */
case 'p':
return(msg);
case 'c':
if ((child = sc->twe_drive[TWE_AEN_UNIT(aen)].td_disk) != NULL) {
sprintf(buf, "twed%d: %s", device_get_unit(child), msg);
} else {
sprintf(buf, "twe%d: %s for unknown unit %d", device_get_unit(sc->twe_dev),
msg, TWE_AEN_UNIT(aen));
}
return(buf);
case 'x':
default:
break;
}
sprintf(buf, "unknown AEN 0x%x", aen);
return(buf);
}
/********************************************************************************
* Print a diagnostic if the status of the command warrants it, and return
* either zero (command was ok) or nonzero (command failed).
*/
static int
twe_report_request(struct twe_request *tr)
{
struct twe_softc *sc = tr->tr_sc;
TWE_Command *cmd = &tr->tr_command;
int result;
switch (cmd->generic.flags) {
case TWE_FLAGS_SUCCESS:
result = 0;
break;
case TWE_FLAGS_INFORMATIONAL:
case TWE_FLAGS_WARNING:
twe_printf(sc, "command completed - %s\n",
twe_describe_code(twe_table_status, cmd->generic.status));
result = 0;
break;
case TWE_FLAGS_FATAL:
default:
twe_printf(sc, "command failed - %s\n",
twe_describe_code(twe_table_status, cmd->generic.status));
result = 1;
/*
* The status code 0xff requests a controller reset
*/
if (cmd->generic.status == 0xff)
twe_reset(sc);
break;
}
return(result);
}
/********************************************************************************
* Print some controller state to aid in debugging error/panic conditions
*/
void
twe_print_controller(struct twe_softc *sc)
{
u_int32_t status_reg;
status_reg = TWE_STATUS(sc);
twe_printf(sc, "status %b\n", status_reg, TWE_STATUS_BITS_DESCRIPTION);
twe_printf(sc, " current max\n");
twe_printf(sc, "free %04d %04d\n", sc->twe_qstat[TWEQ_FREE].q_length, sc->twe_qstat[TWEQ_FREE].q_max);
twe_printf(sc, "ready %04d %04d\n", sc->twe_qstat[TWEQ_READY].q_length, sc->twe_qstat[TWEQ_READY].q_max);
twe_printf(sc, "busy %04d %04d\n", sc->twe_qstat[TWEQ_BUSY].q_length, sc->twe_qstat[TWEQ_BUSY].q_max);
twe_printf(sc, "complete %04d %04d\n", sc->twe_qstat[TWEQ_COMPLETE].q_length, sc->twe_qstat[TWEQ_COMPLETE].q_max);
twe_printf(sc, "bioq %04d %04d\n", sc->twe_qstat[TWEQ_BIO].q_length, sc->twe_qstat[TWEQ_BIO].q_max);
twe_printf(sc, "AEN queue head %d tail %d\n", sc->twe_aen_head, sc->twe_aen_tail);
}
static void
twe_panic(struct twe_softc *sc, char *reason)
{
twe_print_controller(sc);
#ifdef TWE_DEBUG
panic(reason);
#else
twe_reset(sc);
#endif
}
#if 0
/********************************************************************************
* Print a request/command in human-readable format.
*/
static void
twe_print_request(struct twe_request *tr)
{
struct twe_softc *sc = tr->tr_sc;
TWE_Command *cmd = &tr->tr_command;
int i;
twe_printf(sc, "CMD: request_id %d opcode <%s> size %d unit %d host_id %d\n",
cmd->generic.request_id, twe_describe_code(twe_table_opcode, cmd->generic.opcode), cmd->generic.size,
cmd->generic.unit, cmd->generic.host_id);
twe_printf(sc, " status %d flags 0x%x count %d sgl_offset %d\n",
cmd->generic.status, cmd->generic.flags, cmd->generic.count, cmd->generic.sgl_offset);
switch(cmd->generic.opcode) { /* XXX add more opcodes? */
case TWE_OP_READ:
case TWE_OP_WRITE:
twe_printf(sc, " lba %d\n", cmd->io.lba);
for (i = 0; (i < TWE_MAX_SGL_LENGTH) && (cmd->io.sgl[i].length != 0); i++)
twe_printf(sc, " %d: 0x%x/%d\n",
i, cmd->io.sgl[i].address, cmd->io.sgl[i].length);
break;
case TWE_OP_GET_PARAM:
case TWE_OP_SET_PARAM:
for (i = 0; (i < TWE_MAX_SGL_LENGTH) && (cmd->param.sgl[i].length != 0); i++)
twe_printf(sc, " %d: 0x%x/%d\n",
i, cmd->param.sgl[i].address, cmd->param.sgl[i].length);
break;
case TWE_OP_INIT_CONNECTION:
twe_printf(sc, " response queue pointer 0x%x\n",
cmd->initconnection.response_queue_pointer);
break;
default:
break;
}
twe_printf(sc, " tr_command %p/0x%x tr_data %p/0x%x,%d\n",
tr, tr->tr_cmdphys, tr->tr_data, tr->tr_dataphys, tr->tr_length);
twe_printf(sc, " tr_status %d tr_flags 0x%x tr_complete %p tr_private %p\n",
tr->tr_status, tr->tr_flags, tr->tr_complete, tr->tr_private);
}
#endif
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