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freebsd-skq/sys/dev/ata/ata-queue.c
sos ba86c198c3 Work around the deadlock that occours when ATA waits for the taskqueue 
to call back for completition and something else is holding the taskqueue
waiting for ATA to return data.
This should clear up the "semaphore timeout !! DANGER Will Robinson !!"
in most situations, and log "taskqueue timeout - completing request directly"
instead, with a delayed "WARNING - freeing taskqueue zombie request" when
the taskqueue finally calls us back with the now stale request.
(It would have been nice if there was a way to remove a scheduled item from
 a taskqueue, but that is not currently implemented in the kernel).

A real fix for this is in the works but wont make it to 6.1RELEASE

definite MFC candidate.
2006-03-01 07:48:41 +00:00

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/*-
* Copyright (c) 1998 - 2006 Søren Schmidt <sos@FreeBSD.org>
* 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,
* without modification, immediately at the beginning of the file.
* 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 ``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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ata.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ata.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/sema.h>
#include <sys/taskqueue.h>
#include <vm/uma.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/ata/ata-all.h>
#include <ata_if.h>
/* prototypes */
static void ata_completed(void *, int);
static void ata_sort_queue(struct ata_channel *ch, struct ata_request *request);
static char *ata_skey2str(u_int8_t);
void
ata_queue_request(struct ata_request *request)
{
struct ata_channel *ch = device_get_softc(device_get_parent(request->dev));
/* mark request as virgin (this might be a ATA_R_REQUEUE) */
request->result = request->status = request->error = 0;
request->parent = device_get_parent(request->dev);
callout_init_mtx(&request->callout, &ch->state_mtx, CALLOUT_RETURNUNLOCKED);
if (!request->callback && !(request->flags & ATA_R_REQUEUE))
sema_init(&request->done, 0, "ATA request done");
/* in ATA_STALL_QUEUE state we call HW directly */
if ((ch->state & ATA_STALL_QUEUE) && (request->flags & ATA_R_CONTROL)) {
mtx_lock(&ch->state_mtx);
ch->running = request;
if (ch->hw.begin_transaction(request) == ATA_OP_FINISHED) {
ch->running = NULL;
if (!request->callback)
sema_destroy(&request->done);
mtx_unlock(&ch->state_mtx);
return;
}
mtx_unlock(&ch->state_mtx);
}
/* otherwise put request on the locked queue at the specified location */
else {
mtx_lock(&ch->queue_mtx);
if (request->flags & ATA_R_AT_HEAD)
TAILQ_INSERT_HEAD(&ch->ata_queue, request, chain);
else if (request->flags & ATA_R_ORDERED)
ata_sort_queue(ch, request);
else
TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
mtx_unlock(&ch->queue_mtx);
ATA_DEBUG_RQ(request, "queued");
ata_start(ch->dev);
}
/* if this is a requeued request callback/sleep we're done */
if (request->flags & ATA_R_REQUEUE)
return;
/* if this is not a callback wait until request is completed */
if (!request->callback) {
ATA_DEBUG_RQ(request, "wait for completition");
if (!dumping &&
sema_timedwait(&request->done, request->timeout * hz * 4)) {
device_printf(request->dev,
"WARNING - %s taskqueue timeout "
"- completing request directly\n",
ata_cmd2str(request));
request->flags |= ATA_R_DANGER1;
ata_completed(request, 0);
}
sema_destroy(&request->done);
}
}
int
ata_controlcmd(device_t dev, u_int8_t command, u_int16_t feature,
u_int64_t lba, u_int16_t count)
{
struct ata_request *request = ata_alloc_request();
int error = ENOMEM;
if (request) {
request->dev = dev;
request->u.ata.command = command;
request->u.ata.lba = lba;
request->u.ata.count = count;
request->u.ata.feature = feature;
request->flags = ATA_R_CONTROL;
request->timeout = 1;
request->retries = 0;
ata_queue_request(request);
error = request->result;
ata_free_request(request);
}
return error;
}
int
ata_atapicmd(device_t dev, u_int8_t *ccb, caddr_t data,
int count, int flags, int timeout)
{
struct ata_request *request = ata_alloc_request();
struct ata_device *atadev = device_get_softc(dev);
int error = ENOMEM;
if (request) {
request->dev = dev;
if ((atadev->param.config & ATA_PROTO_MASK) == ATA_PROTO_ATAPI_12)
bcopy(ccb, request->u.atapi.ccb, 12);
else
bcopy(ccb, request->u.atapi.ccb, 16);
request->data = data;
request->bytecount = count;
request->transfersize = min(request->bytecount, 65534);
request->flags = flags | ATA_R_ATAPI;
request->timeout = timeout;
request->retries = 0;
ata_queue_request(request);
error = request->result;
ata_free_request(request);
}
return error;
}
void
ata_start(device_t dev)
{
struct ata_channel *ch = device_get_softc(dev);
struct ata_request *request;
struct ata_composite *cptr;
int dependencies = 0;
/* if we have a request on the queue try to get it running */
mtx_lock(&ch->queue_mtx);
if ((request = TAILQ_FIRST(&ch->ata_queue))) {
/* we need the locking function to get the lock for this channel */
if (ATA_LOCKING(dev, ATA_LF_LOCK) == ch->unit) {
/* check for composite dependencies */
if ((cptr = request->composite)) {
mtx_lock(&cptr->lock);
if ((request->flags & ATA_R_WRITE) &&
(cptr->wr_depend & cptr->rd_done) != cptr->wr_depend) {
dependencies = 1;
}
mtx_unlock(&cptr->lock);
}
/* check we are in the right state and has no dependencies */
mtx_lock(&ch->state_mtx);
if (ch->state == ATA_IDLE && !dependencies) {
ATA_DEBUG_RQ(request, "starting");
TAILQ_REMOVE(&ch->ata_queue, request, chain);
ch->running = request;
ch->state = ATA_ACTIVE;
/* if we are the freezing point release it */
if (ch->freezepoint == request)
ch->freezepoint = NULL;
if (ch->hw.begin_transaction(request) == ATA_OP_FINISHED) {
ch->running = NULL;
ch->state = ATA_IDLE;
mtx_unlock(&ch->state_mtx);
mtx_unlock(&ch->queue_mtx);
ATA_LOCKING(dev, ATA_LF_UNLOCK);
ata_finish(request);
return;
}
if (dumping) {
mtx_unlock(&ch->state_mtx);
mtx_unlock(&ch->queue_mtx);
while (!ata_interrupt(ch))
DELAY(10);
return;
}
}
mtx_unlock(&ch->state_mtx);
}
}
mtx_unlock(&ch->queue_mtx);
}
void
ata_finish(struct ata_request *request)
{
struct ata_channel *ch = device_get_softc(request->parent);
/*
* if in ATA_STALL_QUEUE state or request has ATA_R_DIRECT flags set
* we need to call ata_complete() directly here (no taskqueue involvement)
*/
if (dumping ||
(ch->state & ATA_STALL_QUEUE) || (request->flags & ATA_R_DIRECT)) {
ATA_DEBUG_RQ(request, "finish directly");
ata_completed(request, 0);
}
else {
/* put request on the proper taskqueue for completition */
if (request->bio && !(request->flags & (ATA_R_THREAD | ATA_R_TIMEOUT))){
ATA_DEBUG_RQ(request, "finish bio_taskqueue");
bio_taskqueue(request->bio, (bio_task_t *)ata_completed, request);
}
else {
TASK_INIT(&request->task, 0, ata_completed, request);
ATA_DEBUG_RQ(request, "finish taskqueue_swi");
taskqueue_enqueue(taskqueue_swi, &request->task);
}
}
}
static void
ata_completed(void *context, int dummy)
{
struct ata_request *request = (struct ata_request *)context;
struct ata_channel *ch = device_get_softc(request->parent);
struct ata_device *atadev = device_get_softc(request->dev);
struct ata_composite *composite;
if (request->flags & ATA_R_DANGER2) {
device_printf(request->dev,
"WARNING - %s freeing taskqueue zombie request\n",
ata_cmd2str(request));
request->flags &= ~(ATA_R_DANGER1 | ATA_R_DANGER2);
ata_free_request(request);
return;
}
if (request->flags & ATA_R_DANGER1)
request->flags |= ATA_R_DANGER2
ATA_DEBUG_RQ(request, "completed entered");
/* if we had a timeout, reinit channel and deal with the falldown */
if (request->flags & ATA_R_TIMEOUT) {
/*
* if reinit succeeds and the device doesn't get detached and
* there are retries left we reinject this request
*/
if (!ata_reinit(ch->dev) && !request->result &&
(request->retries-- > 0)) {
if (!(request->flags & ATA_R_QUIET)) {
device_printf(request->dev,
"TIMEOUT - %s retrying (%d retr%s left)",
ata_cmd2str(request), request->retries,
request->retries == 1 ? "y" : "ies");
if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
printf(" LBA=%llu", (unsigned long long)request->u.ata.lba);
printf("\n");
}
request->flags &= ~(ATA_R_TIMEOUT | ATA_R_DEBUG);
request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
ATA_DEBUG_RQ(request, "completed reinject");
ata_queue_request(request);
return;
}
/* ran out of good intentions so finish with error */
if (!request->result) {
if (!(request->flags & ATA_R_QUIET)) {
if (request->dev) {
device_printf(request->dev, "FAILURE - %s timed out",
ata_cmd2str(request));
if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
printf(" LBA=%llu",
(unsigned long long)request->u.ata.lba);
printf("\n");
}
}
request->result = EIO;
}
}
else {
/* if this is a soft ECC error warn about it */
/* XXX SOS we could do WARF here */
if ((request->status & (ATA_S_CORR | ATA_S_ERROR)) == ATA_S_CORR) {
device_printf(request->dev,
"WARNING - %s soft error (ECC corrected)",
ata_cmd2str(request));
if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
printf(" LBA=%llu", (unsigned long long)request->u.ata.lba);
printf("\n");
}
/* if this is a UDMA CRC error we reinject if there are retries left */
if (request->flags & ATA_R_DMA && request->error & ATA_E_ICRC) {
if (request->retries-- > 0) {
device_printf(request->dev,
"WARNING - %s UDMA ICRC error (retrying request)",
ata_cmd2str(request));
if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
printf(" LBA=%llu", (unsigned long long)request->u.ata.lba);
printf("\n");
request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
ata_queue_request(request);
return;
}
}
}
switch (request->flags & ATA_R_ATAPI) {
/* ATA errors */
default:
if (!request->result && request->status & ATA_S_ERROR) {
if (!(request->flags & ATA_R_QUIET)) {
device_printf(request->dev,
"FAILURE - %s status=%b error=%b",
ata_cmd2str(request),
request->status, "\20\10BUSY\7READY\6DMA_READY"
"\5DSC\4DRQ\3CORRECTABLE\2INDEX\1ERROR",
request->error, "\20\10ICRC\7UNCORRECTABLE"
"\6MEDIA_CHANGED\5NID_NOT_FOUND"
"\4MEDIA_CHANGE_REQEST"
"\3ABORTED\2NO_MEDIA\1ILLEGAL_LENGTH");
if ((request->flags & ATA_R_DMA) &&
(request->dmastat & ATA_BMSTAT_ERROR))
printf(" dma=0x%02x", request->dmastat);
if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
printf(" LBA=%llu", (unsigned long long)request->u.ata.lba);
printf("\n");
}
request->result = EIO;
}
break;
/* ATAPI errors */
case ATA_R_ATAPI:
/* skip if result already set */
if (request->result)
break;
/* if we have a sensekey -> request sense from device */
if (request->error & ATA_SK_MASK &&
request->u.atapi.ccb[0] != ATAPI_REQUEST_SENSE) {
static u_int8_t ccb[16] = { ATAPI_REQUEST_SENSE, 0, 0, 0,
sizeof(struct atapi_sense),
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
request->u.atapi.sense_key = request->error;
request->u.atapi.sense_cmd = request->u.atapi.ccb[0];
bcopy(ccb, request->u.atapi.ccb, 16);
request->data = (caddr_t)&request->u.atapi.sense_data;
request->bytecount = sizeof(struct atapi_sense);
request->donecount = 0;
request->transfersize = sizeof(struct atapi_sense);
request->timeout = 5;
request->flags &= (ATA_R_ATAPI | ATA_R_QUIET);
request->flags |= (ATA_R_READ | ATA_R_AT_HEAD | ATA_R_REQUEUE);
ATA_DEBUG_RQ(request, "autoissue request sense");
ata_queue_request(request);
return;
}
switch (request->u.atapi.sense_key & ATA_SK_MASK) {
case ATA_SK_RECOVERED_ERROR:
device_printf(request->dev, "WARNING - %s recovered error\n",
ata_cmd2str(request));
/* FALLTHROUGH */
case ATA_SK_NO_SENSE:
request->result = 0;
break;
case ATA_SK_NOT_READY:
request->result = EBUSY;
break;
case ATA_SK_UNIT_ATTENTION:
atadev->flags |= ATA_D_MEDIA_CHANGED;
request->result = EIO;
break;
default:
request->result = EIO;
if (request->flags & ATA_R_QUIET)
break;
device_printf(request->dev,
"FAILURE - %s %s asc=0x%02x ascq=0x%02x ",
ata_cmd2str(request), ata_skey2str(
(request->u.atapi.sense_key & ATA_SK_MASK) >> 4),
request->u.atapi.sense_data.asc,
request->u.atapi.sense_data.ascq);
if (request->u.atapi.sense_data.sksv)
printf("sks=0x%02x 0x%02x 0x%02x ",
request->u.atapi.sense_data.sk_specific,
request->u.atapi.sense_data.sk_specific1,
request->u.atapi.sense_data.sk_specific2);
printf("error=%b\n",
(request->u.atapi.sense_key & ATA_E_MASK),
"\20\4MEDIA_CHANGE_REQUEST\3ABORTED"
"\2NO_MEDIA\1ILLEGAL_LENGTH");
}
if ((request->u.atapi.sense_key ?
request->u.atapi.sense_key : request->error) & ATA_E_MASK)
request->result = EIO;
}
ATA_DEBUG_RQ(request, "completed callback/wakeup");
/* if we are part of a composite operation we need to maintain progress */
if ((composite = request->composite)) {
int index = 0;
mtx_lock(&composite->lock);
/* update whats done */
if (request->flags & ATA_R_READ)
composite->rd_done |= (1 << request->this);
if (request->flags & ATA_R_WRITE)
composite->wr_done |= (1 << request->this);
/* find ready to go dependencies */
if (composite->wr_depend &&
(composite->rd_done & composite->wr_depend)==composite->wr_depend &&
(composite->wr_needed & (~composite->wr_done))) {
index = composite->wr_needed & ~composite->wr_done;
}
mtx_unlock(&composite->lock);
/* if we have any ready candidates kick them off */
if (index) {
int bit;
for (bit = 0; bit < MAX_COMPOSITES; bit++) {
if (index & (1 << bit))
ata_start(device_get_parent(composite->request[bit]->dev));
}
}
}
/* get results back to the initiator for this request */
if (request->callback)
(request->callback)(request);
else
sema_post(&request->done);
ata_start(ch->dev);
}
void
ata_timeout(struct ata_request *request)
{
struct ata_channel *ch = device_get_softc(request->parent);
//request->flags |= ATA_R_DEBUG;
ATA_DEBUG_RQ(request, "timeout");
/*
* if we have an ATA_ACTIVE request running, we flag the request
* ATA_R_TIMEOUT so ata_finish will handle it correctly
* also NULL out the running request so we wont loose
* the race with an eventual interrupt arriving late
*/
if (ch->state == ATA_ACTIVE) {
request->flags |= ATA_R_TIMEOUT;
mtx_unlock(&ch->state_mtx);
ATA_LOCKING(ch->dev, ATA_LF_UNLOCK);
ata_finish(request);
}
else {
mtx_unlock(&ch->state_mtx);
}
}
void
ata_fail_requests(device_t dev)
{
struct ata_channel *ch = device_get_softc(device_get_parent(dev));
struct ata_request *request, *tmp;
TAILQ_HEAD(, ata_request) fail_requests;
TAILQ_INIT(&fail_requests);
/* grap all channel locks to avoid races */
mtx_lock(&ch->queue_mtx);
mtx_lock(&ch->state_mtx);
/* do we have any running request to care about ? */
if ((request = ch->running) && (!dev || request->dev == dev)) {
callout_stop(&request->callout);
ch->running = NULL;
request->result = ENXIO;
TAILQ_INSERT_TAIL(&fail_requests, request, chain);
}
/* fail all requests queued on this channel for device dev if !NULL */
TAILQ_FOREACH_SAFE(request, &ch->ata_queue, chain, tmp) {
if (!dev || request->dev == dev) {
TAILQ_REMOVE(&ch->ata_queue, request, chain);
request->result = ENXIO;
TAILQ_INSERT_TAIL(&fail_requests, request, chain);
}
}
mtx_unlock(&ch->state_mtx);
mtx_unlock(&ch->queue_mtx);
/* finish up all requests collected above */
TAILQ_FOREACH_SAFE(request, &fail_requests, chain, tmp) {
TAILQ_REMOVE(&fail_requests, request, chain);
ata_finish(request);
}
}
static u_int64_t
ata_get_lba(struct ata_request *request)
{
if (request->flags & ATA_R_ATAPI) {
switch (request->u.atapi.ccb[0]) {
case ATAPI_READ_BIG:
case ATAPI_WRITE_BIG:
case ATAPI_READ_CD:
return (request->u.atapi.ccb[5]) | (request->u.atapi.ccb[4]<<8) |
(request->u.atapi.ccb[3]<<16)|(request->u.atapi.ccb[2]<<24);
case ATAPI_READ:
case ATAPI_WRITE:
return (request->u.atapi.ccb[4]) | (request->u.atapi.ccb[3]<<8) |
(request->u.atapi.ccb[2]<<16);
default:
return 0;
}
}
else
return request->u.ata.lba;
}
static void
ata_sort_queue(struct ata_channel *ch, struct ata_request *request)
{
struct ata_request *this, *next;
this = TAILQ_FIRST(&ch->ata_queue);
/* if the queue is empty just insert */
if (!this) {
if (request->composite)
ch->freezepoint = request;
TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
return;
}
/* dont sort frozen parts of the queue */
if (ch->freezepoint)
this = ch->freezepoint;
/* if position is less than head we add after tipping point */
if (ata_get_lba(request) < ata_get_lba(this)) {
while ((next = TAILQ_NEXT(this, chain))) {
/* have we reached the tipping point */
if (ata_get_lba(next) < ata_get_lba(this)) {
/* sort the insert */
do {
if (ata_get_lba(request) < ata_get_lba(next))
break;
this = next;
} while ((next = TAILQ_NEXT(this, chain)));
break;
}
this = next;
}
}
/* we are after head so sort the insert before tipping point */
else {
while ((next = TAILQ_NEXT(this, chain))) {
if (ata_get_lba(next) < ata_get_lba(this) ||
ata_get_lba(request) < ata_get_lba(next))
break;
this = next;
}
}
if (request->composite)
ch->freezepoint = request;
TAILQ_INSERT_AFTER(&ch->ata_queue, this, request, chain);
}
char *
ata_cmd2str(struct ata_request *request)
{
static char buffer[20];
if (request->flags & ATA_R_ATAPI) {
switch (request->u.atapi.sense_key ?
request->u.atapi.sense_cmd : request->u.atapi.ccb[0]) {
case 0x00: return ("TEST_UNIT_READY");
case 0x01: return ("REZERO");
case 0x03: return ("REQUEST_SENSE");
case 0x04: return ("FORMAT");
case 0x08: return ("READ");
case 0x0a: return ("WRITE");
case 0x10: return ("WEOF");
case 0x11: return ("SPACE");
case 0x12: return ("INQUIRY");
case 0x15: return ("MODE_SELECT");
case 0x19: return ("ERASE");
case 0x1a: return ("MODE_SENSE");
case 0x1b: return ("START_STOP");
case 0x1e: return ("PREVENT_ALLOW");
case 0x23: return ("ATAPI_READ_FORMAT_CAPACITIES");
case 0x25: return ("READ_CAPACITY");
case 0x28: return ("READ_BIG");
case 0x2a: return ("WRITE_BIG");
case 0x2b: return ("LOCATE");
case 0x34: return ("READ_POSITION");
case 0x35: return ("SYNCHRONIZE_CACHE");
case 0x3b: return ("WRITE_BUFFER");
case 0x3c: return ("READ_BUFFER");
case 0x42: return ("READ_SUBCHANNEL");
case 0x43: return ("READ_TOC");
case 0x45: return ("PLAY_10");
case 0x47: return ("PLAY_MSF");
case 0x48: return ("PLAY_TRACK");
case 0x4b: return ("PAUSE");
case 0x51: return ("READ_DISK_INFO");
case 0x52: return ("READ_TRACK_INFO");
case 0x53: return ("RESERVE_TRACK");
case 0x54: return ("SEND_OPC_INFO");
case 0x55: return ("MODE_SELECT_BIG");
case 0x58: return ("REPAIR_TRACK");
case 0x59: return ("READ_MASTER_CUE");
case 0x5a: return ("MODE_SENSE_BIG");
case 0x5b: return ("CLOSE_TRACK/SESSION");
case 0x5c: return ("READ_BUFFER_CAPACITY");
case 0x5d: return ("SEND_CUE_SHEET");
case 0xa1: return ("BLANK_CMD");
case 0xa3: return ("SEND_KEY");
case 0xa4: return ("REPORT_KEY");
case 0xa5: return ("PLAY_12");
case 0xa6: return ("LOAD_UNLOAD");
case 0xad: return ("READ_DVD_STRUCTURE");
case 0xb4: return ("PLAY_CD");
case 0xbb: return ("SET_SPEED");
case 0xbd: return ("MECH_STATUS");
case 0xbe: return ("READ_CD");
case 0xff: return ("POLL_DSC");
}
}
else {
switch (request->u.ata.command) {
case 0x00: return ("NOP");
case 0x08: return ("DEVICE_RESET");
case 0x20: return ("READ");
case 0x24: return ("READ48");
case 0x25: return ("READ_DMA48");
case 0x26: return ("READ_DMA_QUEUED48");
case 0x29: return ("READ_MUL48");
case 0x30: return ("WRITE");
case 0x34: return ("WRITE48");
case 0x35: return ("WRITE_DMA48");
case 0x36: return ("WRITE_DMA_QUEUED48");
case 0x39: return ("WRITE_MUL48");
case 0x70: return ("SEEK");
case 0xa0: return ("PACKET_CMD");
case 0xa1: return ("ATAPI_IDENTIFY");
case 0xa2: return ("SERVICE");
case 0xc0: return ("CFA ERASE");
case 0xc4: return ("READ_MUL");
case 0xc5: return ("WRITE_MUL");
case 0xc6: return ("SET_MULTI");
case 0xc7: return ("READ_DMA_QUEUED");
case 0xc8: return ("READ_DMA");
case 0xca: return ("WRITE_DMA");
case 0xcc: return ("WRITE_DMA_QUEUED");
case 0xe6: return ("SLEEP");
case 0xe7: return ("FLUSHCACHE");
case 0xea: return ("FLUSHCACHE48");
case 0xec: return ("ATA_IDENTIFY");
case 0xef:
switch (request->u.ata.feature) {
case 0x03: return ("SETFEATURES SET TRANSFER MODE");
case 0x02: return ("SETFEATURES ENABLE WCACHE");
case 0x82: return ("SETFEATURES DISABLE WCACHE");
case 0xaa: return ("SETFEATURES ENABLE RCACHE");
case 0x55: return ("SETFEATURES DISABLE RCACHE");
}
sprintf(buffer, "SETFEATURES 0x%02x", request->u.ata.feature);
return buffer;
}
}
sprintf(buffer, "unknown CMD (0x%02x)", request->u.ata.command);
return buffer;
}
static char *
ata_skey2str(u_int8_t skey)
{
switch (skey) {
case 0x00: return ("NO SENSE");
case 0x01: return ("RECOVERED ERROR");
case 0x02: return ("NOT READY");
case 0x03: return ("MEDIUM ERROR");
case 0x04: return ("HARDWARE ERROR");
case 0x05: return ("ILLEGAL REQUEST");
case 0x06: return ("UNIT ATTENTION");
case 0x07: return ("DATA PROTECT");
case 0x08: return ("BLANK CHECK");
case 0x09: return ("VENDOR SPECIFIC");
case 0x0a: return ("COPY ABORTED");
case 0x0b: return ("ABORTED COMMAND");
case 0x0c: return ("EQUAL");
case 0x0d: return ("VOLUME OVERFLOW");
case 0x0e: return ("MISCOMPARE");
case 0x0f: return ("RESERVED");
default: return("UNKNOWN");
}
}
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