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02268a2d11
freebsd-skq/sys/dev/ata/ata-queue.c
Søren Schmidt 0387836deb Harden the hotplug support for SATA devices. 
This also fixes a few races that was present in the timeout/detach code.

Sponsored by: pair.com
2005-09-14 12:45:06 +00:00

712 lines
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/*-
* Copyright (c) 1998 - 2005 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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;
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 (used only during reinit) */
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");
while (sema_timedwait(&request->done, request->timeout * hz * 4)) {
device_printf(request->dev,
"req=%p %s semaphore timeout !! DANGER Will Robinson !!\n",
request, ata_cmd2str(request));
ata_start(ch->dev);
}
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;
}
}
mtx_unlock(&ch->state_mtx);
}
}
mtx_unlock(&ch->queue_mtx);
}
void
ata_finish(struct ata_request *request)
{
struct ata_channel *ch = device_get_softc(device_get_parent(request->dev));
/*
* 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 ((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(device_get_parent(request->dev));
struct ata_device *atadev = device_get_softc(request->dev);
struct ata_composite *composite;
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 update progress */
if ((composite = request->composite)) {
int index = 0;
mtx_lock(&composite->lock);
if (request->flags & ATA_R_READ)
composite->rd_done |= (1 << request->this);
if (request->flags & ATA_R_WRITE)
composite->wr_done |= (1 << request->this);
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))) - 1;
}
mtx_unlock(&composite->lock);
if (index)
ata_start(device_get_parent(composite->request[index]->dev));
}
/* get results back to the initiator */
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(device_get_parent(request->dev));
//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;
ch->running = NULL;
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;
/* do we have any outstanding request to care about ?*/
mtx_lock(&ch->state_mtx);
if ((request = ch->running) && (!dev || request->dev == dev)) {
callout_stop(&request->callout);
ch->running = NULL;
}
else
request = NULL;
mtx_unlock(&ch->state_mtx);
if (request) {
request->result = ENXIO;
ata_finish(request);
}
/* fail all requests queued on this channel for device dev if !NULL */
mtx_lock(&ch->queue_mtx);
while ((request = TAILQ_FIRST(&ch->ata_queue))) {
if (!dev || request->dev == dev) {
TAILQ_REMOVE(&ch->ata_queue, request, chain);
mtx_unlock(&ch->queue_mtx);
request->result = ENXIO;
ata_finish(request);
mtx_lock(&ch->queue_mtx);
}
}
mtx_unlock(&ch->queue_mtx);
}
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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