+++ /dev/null
-/*
- * scsi_obsolete.c Copyright (C) 1992 Drew Eckhardt
- * Copyright (C) 1993, 1994, 1995 Eric Youngdale
- *
- * generic mid-level SCSI driver
- * Initial versions: Drew Eckhardt
- * Subsequent revisions: Eric Youngdale
- *
- * <drew@colorado.edu>
- *
- * Bug correction thanks go to :
- * Rik Faith <faith@cs.unc.edu>
- * Tommy Thorn <tthorn>
- * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de>
- *
- * Modified by Eric Youngdale eric@andante.org to
- * add scatter-gather, multiple outstanding request, and other
- * enhancements.
- *
- * Native multichannel, wide scsi, /proc/scsi and hot plugging
- * support added by Michael Neuffer <mike@i-connect.net>
- *
- * Major improvements to the timeout, abort, and reset processing,
- * as well as performance modifications for large queue depths by
- * Leonard N. Zubkoff <lnz@dandelion.com>
- *
- * Improved compatibility with 2.0 behaviour by Manfred Spraul
- * <masp0008@stud.uni-sb.de>
- */
-
-/*
- *#########################################################################
- *#########################################################################
- *#########################################################################
- *#########################################################################
- * NOTE - NOTE - NOTE - NOTE - NOTE - NOTE - NOTE
- *
- *#########################################################################
- *#########################################################################
- *#########################################################################
- *#########################################################################
- *
- * This file contains the 'old' scsi error handling. It is only present
- * while the new error handling code is being debugged, and while the low
- * level drivers are being converted to use the new code. Once the last
- * driver uses the new code this *ENTIRE* file will be nuked.
- */
-
-#define __NO_VERSION__
-#include <linux/module.h>
-
-#include <linux/sched.h>
-#include <linux/timer.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/ioport.h>
-#include <linux/kernel.h>
-#include <linux/stat.h>
-#include <linux/blk.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-
-#include <asm/system.h>
-#include <asm/irq.h>
-#include <asm/dma.h>
-
-#include "scsi.h"
-#include "hosts.h"
-#include "constants.h"
-
-#undef USE_STATIC_SCSI_MEMORY
-
-/*
- static const char RCSid[] = "$Header: /mnt/ide/home/eric/CVSROOT/linux/drivers/scsi/scsi_obsolete.c,v 1.1 1997/05/18 23:27:21 eric Exp $";
- */
-
-
-#define INTERNAL_ERROR (panic ("Internal error in file %s, line %d.\n", __FILE__, __LINE__))
-
-
-static int scsi_abort(Scsi_Cmnd *, int code);
-static int scsi_reset(Scsi_Cmnd *, unsigned int);
-
-extern void scsi_old_done(Scsi_Cmnd * SCpnt);
-int update_timeout(Scsi_Cmnd *, int);
-extern void scsi_old_times_out(Scsi_Cmnd * SCpnt);
-
-extern int scsi_dispatch_cmd(Scsi_Cmnd * SCpnt);
-
-#define SCSI_BLOCK(HOST) (HOST->can_queue && HOST->host_busy >= HOST->can_queue)
-
-static unsigned char generic_sense[6] =
-{REQUEST_SENSE, 0, 0, 0, 255, 0};
-
-/*
- * This is the number of clock ticks we should wait before we time out
- * and abort the command. This is for where the scsi.c module generates
- * the command, not where it originates from a higher level, in which
- * case the timeout is specified there.
- *
- * ABORT_TIMEOUT and RESET_TIMEOUT are the timeouts for RESET and ABORT
- * respectively.
- */
-
-#ifdef DEBUG_TIMEOUT
-static void scsi_dump_status(void);
-#endif
-
-
-#ifdef DEBUG
-#define SCSI_TIMEOUT (5*HZ)
-#else
-#define SCSI_TIMEOUT (2*HZ)
-#endif
-
-#ifdef DEBUG
-#define SENSE_TIMEOUT SCSI_TIMEOUT
-#define ABORT_TIMEOUT SCSI_TIMEOUT
-#define RESET_TIMEOUT SCSI_TIMEOUT
-#else
-#define SENSE_TIMEOUT (5*HZ/10)
-#define RESET_TIMEOUT (5*HZ/10)
-#define ABORT_TIMEOUT (5*HZ/10)
-#endif
-
-
-/* Do not call reset on error if we just did a reset within 15 sec. */
-#define MIN_RESET_PERIOD (15*HZ)
-
-
-
-/*
- * Flag bits for the internal_timeout array
- */
-#define IN_ABORT 1
-#define IN_RESET 2
-#define IN_RESET2 4
-#define IN_RESET3 8
-
-/*
- * This is our time out function, called when the timer expires for a
- * given host adapter. It will attempt to abort the currently executing
- * command, that failing perform a kernel panic.
- */
-
-void scsi_old_times_out(Scsi_Cmnd * SCpnt)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&io_request_lock, flags);
-
- /* Set the serial_number_at_timeout to the current serial_number */
- SCpnt->serial_number_at_timeout = SCpnt->serial_number;
-
- switch (SCpnt->internal_timeout & (IN_ABORT | IN_RESET | IN_RESET2 | IN_RESET3)) {
- case NORMAL_TIMEOUT:
- {
-#ifdef DEBUG_TIMEOUT
- scsi_dump_status();
-#endif
- }
-
- if (!scsi_abort(SCpnt, DID_TIME_OUT))
- break;
- case IN_ABORT:
- printk("SCSI host %d abort (pid %ld) timed out - resetting\n",
- SCpnt->host->host_no, SCpnt->pid);
- if (!scsi_reset(SCpnt, SCSI_RESET_ASYNCHRONOUS))
- break;
- case IN_RESET:
- case (IN_ABORT | IN_RESET):
- /* This might be controversial, but if there is a bus hang,
- * you might conceivably want the machine up and running
- * esp if you have an ide disk.
- */
- printk("SCSI host %d channel %d reset (pid %ld) timed out - "
- "trying harder\n",
- SCpnt->host->host_no, SCpnt->channel, SCpnt->pid);
- SCpnt->internal_timeout &= ~IN_RESET;
- SCpnt->internal_timeout |= IN_RESET2;
- scsi_reset(SCpnt,
- SCSI_RESET_ASYNCHRONOUS | SCSI_RESET_SUGGEST_BUS_RESET);
- break;
- case IN_RESET2:
- case (IN_ABORT | IN_RESET2):
- /* Obviously the bus reset didn't work.
- * Let's try even harder and call for an HBA reset.
- * Maybe the HBA itself crashed and this will shake it loose.
- */
- printk("SCSI host %d reset (pid %ld) timed out - trying to shake it loose\n",
- SCpnt->host->host_no, SCpnt->pid);
- SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2);
- SCpnt->internal_timeout |= IN_RESET3;
- scsi_reset(SCpnt,
- SCSI_RESET_ASYNCHRONOUS | SCSI_RESET_SUGGEST_HOST_RESET);
- break;
-
- default:
- printk("SCSI host %d reset (pid %ld) timed out again -\n",
- SCpnt->host->host_no, SCpnt->pid);
- printk("probably an unrecoverable SCSI bus or device hang.\n");
- break;
-
- }
- spin_unlock_irqrestore(&io_request_lock, flags);
-
-}
-
-/*
- * From what I can find in scsi_obsolete.c, this function is only called
- * by scsi_old_done and scsi_reset. Both of these functions run with the
- * io_request_lock already held, so we need do nothing here about grabbing
- * any locks.
- */
-static void scsi_request_sense(Scsi_Cmnd * SCpnt)
-{
- SCpnt->flags |= WAS_SENSE | ASKED_FOR_SENSE;
- update_timeout(SCpnt, SENSE_TIMEOUT);
-
-
- memcpy((void *) SCpnt->cmnd, (void *) generic_sense,
- sizeof(generic_sense));
- memset((void *) SCpnt->sense_buffer, 0,
- sizeof(SCpnt->sense_buffer));
-
- if (SCpnt->device->scsi_level <= SCSI_2)
- SCpnt->cmnd[1] = SCpnt->lun << 5;
- SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
-
- SCpnt->request_buffer = &SCpnt->sense_buffer;
- SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
- SCpnt->use_sg = 0;
- SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
- SCpnt->result = 0;
- SCpnt->sc_data_direction = SCSI_DATA_READ;
-
- /*
- * Ugly, ugly. The newer interfaces all assume that the lock
- * isn't held. Mustn't disappoint, or we deadlock the system.
- */
- spin_unlock_irq(&io_request_lock);
- scsi_dispatch_cmd(SCpnt);
- spin_lock_irq(&io_request_lock);
-}
-
-
-
-
-static int check_sense(Scsi_Cmnd * SCpnt)
-{
- /* If there is no sense information, request it. If we have already
- * requested it, there is no point in asking again - the firmware must
- * be confused.
- */
- if (((SCpnt->sense_buffer[0] & 0x70) >> 4) != 7) {
- if (!(SCpnt->flags & ASKED_FOR_SENSE))
- return SUGGEST_SENSE;
- else
- return SUGGEST_RETRY;
- }
- SCpnt->flags &= ~ASKED_FOR_SENSE;
-
-#ifdef DEBUG_INIT
- printk("scsi%d, channel%d : ", SCpnt->host->host_no, SCpnt->channel);
- print_sense("", SCpnt);
- printk("\n");
-#endif
- if (SCpnt->sense_buffer[2] & 0xe0)
- return SUGGEST_ABORT;
-
- switch (SCpnt->sense_buffer[2] & 0xf) {
- case NO_SENSE:
- return 0;
- case RECOVERED_ERROR:
- return SUGGEST_IS_OK;
-
- case ABORTED_COMMAND:
- return SUGGEST_RETRY;
- case NOT_READY:
- case UNIT_ATTENTION:
- /*
- * If we are expecting a CC/UA because of a bus reset that we
- * performed, treat this just as a retry. Otherwise this is
- * information that we should pass up to the upper-level driver
- * so that we can deal with it there.
- */
- if (SCpnt->device->expecting_cc_ua) {
- SCpnt->device->expecting_cc_ua = 0;
- return SUGGEST_RETRY;
- }
- return SUGGEST_ABORT;
-
- /* these three are not supported */
- case COPY_ABORTED:
- case VOLUME_OVERFLOW:
- case MISCOMPARE:
-
- case MEDIUM_ERROR:
- return SUGGEST_REMAP;
- case BLANK_CHECK:
- case DATA_PROTECT:
- case HARDWARE_ERROR:
- case ILLEGAL_REQUEST:
- default:
- return SUGGEST_ABORT;
- }
-}
-
-/* This function is the mid-level interrupt routine, which decides how
- * to handle error conditions. Each invocation of this function must
- * do one and *only* one of the following:
- *
- * (1) Call last_cmnd[host].done. This is done for fatal errors and
- * normal completion, and indicates that the handling for this
- * request is complete.
- * (2) Call internal_cmnd to requeue the command. This will result in
- * scsi_done being called again when the retry is complete.
- * (3) Call scsi_request_sense. This asks the host adapter/drive for
- * more information about the error condition. When the information
- * is available, scsi_done will be called again.
- * (4) Call reset(). This is sort of a last resort, and the idea is that
- * this may kick things loose and get the drive working again. reset()
- * automatically calls scsi_request_sense, and thus scsi_done will be
- * called again once the reset is complete.
- *
- * If none of the above actions are taken, the drive in question
- * will hang. If more than one of the above actions are taken by
- * scsi_done, then unpredictable behavior will result.
- */
-void scsi_old_done(Scsi_Cmnd * SCpnt)
-{
- int status = 0;
- int exit = 0;
- int checked;
- int oldto;
- struct Scsi_Host *host = SCpnt->host;
- Scsi_Device * device = SCpnt->device;
- int result = SCpnt->result;
- SCpnt->serial_number = 0;
- SCpnt->serial_number_at_timeout = 0;
- oldto = update_timeout(SCpnt, 0);
-
-#ifdef DEBUG_TIMEOUT
- if (result)
- printk("Non-zero result in scsi_done %x %d:%d\n",
- result, SCpnt->target, SCpnt->lun);
-#endif
-
- /* If we requested an abort, (and we got it) then fix up the return
- * status to say why
- */
- if (host_byte(result) == DID_ABORT && SCpnt->abort_reason)
- SCpnt->result = result = (result & 0xff00ffff) |
- (SCpnt->abort_reason << 16);
-
-
-#define CMD_FINISHED 0
-#define MAYREDO 1
-#define REDO 3
-#define PENDING 4
-
-#ifdef DEBUG
- printk("In scsi_done(host = %d, result = %06x)\n", host->host_no, result);
-#endif
-
- if (SCpnt->flags & SYNC_RESET) {
- /*
- * The behaviou of scsi_reset(SYNC) was changed in 2.1.? .
- * The scsi mid-layer does a REDO after every sync reset, the driver
- * must not do that any more. In order to prevent old drivers from
- * crashing, all scsi_done() calls during sync resets are ignored.
- */
- printk("scsi%d: device driver called scsi_done() "
- "for a synchronous reset.\n", SCpnt->host->host_no);
- return;
- }
- if (SCpnt->flags & WAS_SENSE) {
- SCpnt->use_sg = SCpnt->old_use_sg;
- SCpnt->cmd_len = SCpnt->old_cmd_len;
- SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
- SCpnt->underflow = SCpnt->old_underflow;
- }
- switch (host_byte(result)) {
- case DID_OK:
- if (status_byte(result) && (SCpnt->flags & WAS_SENSE))
- /* Failed to obtain sense information */
- {
- SCpnt->flags &= ~WAS_SENSE;
-#if 0 /* This cannot possibly be correct. */
- SCpnt->internal_timeout &= ~SENSE_TIMEOUT;
-#endif
-
- if (!(SCpnt->flags & WAS_RESET)) {
- printk("scsi%d : channel %d target %d lun %d request sense"
- " failed, performing reset.\n",
- SCpnt->host->host_no, SCpnt->channel, SCpnt->target,
- SCpnt->lun);
- scsi_reset(SCpnt, SCSI_RESET_SYNCHRONOUS);
- status = REDO;
- break;
- } else {
- exit = (DRIVER_HARD | SUGGEST_ABORT);
- status = CMD_FINISHED;
- }
- } else
- switch (msg_byte(result)) {
- case COMMAND_COMPLETE:
- switch (status_byte(result)) {
- case GOOD:
- if (SCpnt->flags & WAS_SENSE) {
-#ifdef DEBUG
- printk("In scsi_done, GOOD status, COMMAND COMPLETE, "
- "parsing sense information.\n");
-#endif
- SCpnt->flags &= ~WAS_SENSE;
-#if 0 /* This cannot possibly be correct. */
- SCpnt->internal_timeout &= ~SENSE_TIMEOUT;
-#endif
-
- switch (checked = check_sense(SCpnt)) {
- case SUGGEST_SENSE:
- case 0:
-#ifdef DEBUG
- printk("NO SENSE. status = REDO\n");
-#endif
- update_timeout(SCpnt, oldto);
- status = REDO;
- break;
- case SUGGEST_IS_OK:
- break;
- case SUGGEST_REMAP:
-#ifdef DEBUG
- printk("SENSE SUGGEST REMAP - status = CMD_FINISHED\n");
-#endif
- status = CMD_FINISHED;
- exit = DRIVER_SENSE | SUGGEST_ABORT;
- break;
- case SUGGEST_RETRY:
-#ifdef DEBUG
- printk("SENSE SUGGEST RETRY - status = MAYREDO\n");
-#endif
- status = MAYREDO;
- exit = DRIVER_SENSE | SUGGEST_RETRY;
- break;
- case SUGGEST_ABORT:
-#ifdef DEBUG
- printk("SENSE SUGGEST ABORT - status = CMD_FINISHED");
-#endif
- status = CMD_FINISHED;
- exit = DRIVER_SENSE | SUGGEST_ABORT;
- break;
- default:
- printk("Internal error %s %d \n", __FILE__,
- __LINE__);
- }
- }
- /* end WAS_SENSE */
- else {
-#ifdef DEBUG
- printk("COMMAND COMPLETE message returned, "
- "status = CMD_FINISHED. \n");
-#endif
- exit = DRIVER_OK;
- status = CMD_FINISHED;
- }
- break;
-
- case CHECK_CONDITION:
- case COMMAND_TERMINATED:
- switch (check_sense(SCpnt)) {
- case 0:
- update_timeout(SCpnt, oldto);
- status = REDO;
- break;
- case SUGGEST_REMAP:
- status = CMD_FINISHED;
- exit = DRIVER_SENSE | SUGGEST_ABORT;
- break;
- case SUGGEST_RETRY:
- status = MAYREDO;
- exit = DRIVER_SENSE | SUGGEST_RETRY;
- break;
- case SUGGEST_ABORT:
- status = CMD_FINISHED;
- exit = DRIVER_SENSE | SUGGEST_ABORT;
- break;
- case SUGGEST_SENSE:
- scsi_request_sense(SCpnt);
- status = PENDING;
- break;
- }
- break;
-
- case CONDITION_GOOD:
- case INTERMEDIATE_GOOD:
- case INTERMEDIATE_C_GOOD:
- break;
-
- case BUSY:
- case QUEUE_FULL:
- update_timeout(SCpnt, oldto);
- status = REDO;
- break;
-
- case RESERVATION_CONFLICT:
- /*
- * Most HAs will return an error for
- * this, so usually reservation
- * conflicts will be processed under
- * DID_ERROR code
- */
- printk("scsi%d (%d,%d,%d) : RESERVATION CONFLICT\n",
- SCpnt->host->host_no, SCpnt->channel,
- SCpnt->device->id, SCpnt->device->lun);
- status = CMD_FINISHED; /* returns I/O error */
- break;
-
- default:
- printk("Internal error %s %d \n"
- "status byte = %d \n", __FILE__,
- __LINE__, status_byte(result));
-
- }
- break;
- default:
- panic("scsi: unsupported message byte %d received\n",
- msg_byte(result));
- }
- break;
- case DID_TIME_OUT:
-#ifdef DEBUG
- printk("Host returned DID_TIME_OUT - ");
-#endif
-
- if (SCpnt->flags & WAS_TIMEDOUT) {
-#ifdef DEBUG
- printk("Aborting\n");
-#endif
- /*
- Allow TEST_UNIT_READY and INQUIRY commands to timeout early
- without causing resets. All other commands should be retried.
- */
- if (SCpnt->cmnd[0] != TEST_UNIT_READY &&
- SCpnt->cmnd[0] != INQUIRY)
- status = MAYREDO;
- exit = (DRIVER_TIMEOUT | SUGGEST_ABORT);
- } else {
-#ifdef DEBUG
- printk("Retrying.\n");
-#endif
- SCpnt->flags |= WAS_TIMEDOUT;
- SCpnt->internal_timeout &= ~IN_ABORT;
- status = REDO;
- }
- break;
- case DID_BUS_BUSY:
- case DID_PARITY:
- status = REDO;
- break;
- case DID_NO_CONNECT:
-#ifdef DEBUG
- printk("Couldn't connect.\n");
-#endif
- exit = (DRIVER_HARD | SUGGEST_ABORT);
- break;
- case DID_ERROR:
- if (msg_byte(result) == COMMAND_COMPLETE &&
- status_byte(result) == RESERVATION_CONFLICT) {
- printk("scsi%d (%d,%d,%d) : RESERVATION CONFLICT\n",
- SCpnt->host->host_no, SCpnt->channel,
- SCpnt->device->id, SCpnt->device->lun);
- status = CMD_FINISHED; /* returns I/O error */
- break;
- }
- status = MAYREDO;
- exit = (DRIVER_HARD | SUGGEST_ABORT);
- break;
- case DID_BAD_TARGET:
- case DID_ABORT:
- exit = (DRIVER_INVALID | SUGGEST_ABORT);
- break;
- case DID_RESET:
- if (SCpnt->flags & IS_RESETTING) {
- SCpnt->flags &= ~IS_RESETTING;
- status = REDO;
- break;
- }
- if (msg_byte(result) == GOOD &&
- status_byte(result) == CHECK_CONDITION) {
- switch (check_sense(SCpnt)) {
- case 0:
- update_timeout(SCpnt, oldto);
- status = REDO;
- break;
- case SUGGEST_REMAP:
- case SUGGEST_RETRY:
- status = MAYREDO;
- exit = DRIVER_SENSE | SUGGEST_RETRY;
- break;
- case SUGGEST_ABORT:
- status = CMD_FINISHED;
- exit = DRIVER_SENSE | SUGGEST_ABORT;
- break;
- case SUGGEST_SENSE:
- scsi_request_sense(SCpnt);
- status = PENDING;
- break;
- }
- } else {
- status = REDO;
- exit = SUGGEST_RETRY;
- }
- break;
- default:
- exit = (DRIVER_ERROR | SUGGEST_DIE);
- }
-
- switch (status) {
- case CMD_FINISHED:
- case PENDING:
- break;
- case MAYREDO:
-#ifdef DEBUG
- printk("In MAYREDO, allowing %d retries, have %d\n",
- SCpnt->allowed, SCpnt->retries);
-#endif
- if ((++SCpnt->retries) < SCpnt->allowed) {
- if ((SCpnt->retries >= (SCpnt->allowed >> 1))
- && !(SCpnt->host->resetting && time_before(jiffies, SCpnt->host->last_reset + MIN_RESET_PERIOD))
- && !(SCpnt->flags & WAS_RESET)) {
- printk("scsi%d channel %d : resetting for second half of retries.\n",
- SCpnt->host->host_no, SCpnt->channel);
- scsi_reset(SCpnt, SCSI_RESET_SYNCHRONOUS);
- /* fall through to REDO */
- }
- } else {
- status = CMD_FINISHED;
- break;
- }
- /* fall through to REDO */
-
- case REDO:
-
- if (SCpnt->flags & WAS_SENSE)
- scsi_request_sense(SCpnt);
- else {
- memcpy((void *) SCpnt->cmnd,
- (void *) SCpnt->data_cmnd,
- sizeof(SCpnt->data_cmnd));
- memset((void *) SCpnt->sense_buffer, 0,
- sizeof(SCpnt->sense_buffer));
- SCpnt->request_buffer = SCpnt->buffer;
- SCpnt->request_bufflen = SCpnt->bufflen;
- SCpnt->use_sg = SCpnt->old_use_sg;
- SCpnt->cmd_len = SCpnt->old_cmd_len;
- SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
- SCpnt->underflow = SCpnt->old_underflow;
- SCpnt->result = 0;
- /*
- * Ugly, ugly. The newer interfaces all
- * assume that the lock isn't held. Mustn't
- * disappoint, or we deadlock the system.
- */
- spin_unlock_irq(&io_request_lock);
- scsi_dispatch_cmd(SCpnt);
- spin_lock_irq(&io_request_lock);
- }
- break;
- default:
- INTERNAL_ERROR;
- }
-
- if (status == CMD_FINISHED) {
- Scsi_Request *SRpnt;
-#ifdef DEBUG
- printk("Calling done function - at address %p\n", SCpnt->done);
-#endif
- host->host_busy--; /* Indicate that we are free */
- device->device_busy--; /* Decrement device usage counter. */
-
- SCpnt->result = result | ((exit & 0xff) << 24);
- SCpnt->use_sg = SCpnt->old_use_sg;
- SCpnt->cmd_len = SCpnt->old_cmd_len;
- SCpnt->sc_data_direction = SCpnt->sc_old_data_direction;
- SCpnt->underflow = SCpnt->old_underflow;
- /*
- * The upper layers assume the lock isn't held. We mustn't
- * disappoint them. When the new error handling code is in
- * use, the upper code is run from a bottom half handler, so
- * it isn't an issue.
- */
- spin_unlock_irq(&io_request_lock);
- SRpnt = SCpnt->sc_request;
- if( SRpnt != NULL ) {
- SRpnt->sr_result = SRpnt->sr_command->result;
- if( SRpnt->sr_result != 0 ) {
- memcpy(SRpnt->sr_sense_buffer,
- SRpnt->sr_command->sense_buffer,
- sizeof(SRpnt->sr_sense_buffer));
- }
- }
-
- SCpnt->done(SCpnt);
- spin_lock_irq(&io_request_lock);
- }
-#undef CMD_FINISHED
-#undef REDO
-#undef MAYREDO
-#undef PENDING
-}
-
-/*
- * The scsi_abort function interfaces with the abort() function of the host
- * we are aborting, and causes the current command to not complete. The
- * caller should deal with any error messages or status returned on the
- * next call.
- *
- * This will not be called reentrantly for a given host.
- */
-
-/*
- * Since we're nice guys and specified that abort() and reset()
- * can be non-reentrant. The internal_timeout flags are used for
- * this.
- */
-
-
-static int scsi_abort(Scsi_Cmnd * SCpnt, int why)
-{
- int oldto;
- struct Scsi_Host *host = SCpnt->host;
-
- while (1) {
-
- /*
- * Protect against races here. If the command is done, or we are
- * on a different command forget it.
- */
- if (SCpnt->serial_number != SCpnt->serial_number_at_timeout) {
- return 0;
- }
- if (SCpnt->internal_timeout & IN_ABORT) {
- spin_unlock_irq(&io_request_lock);
- while (SCpnt->internal_timeout & IN_ABORT)
- barrier();
- spin_lock_irq(&io_request_lock);
- } else {
- SCpnt->internal_timeout |= IN_ABORT;
- oldto = update_timeout(SCpnt, ABORT_TIMEOUT);
-
- if ((SCpnt->flags & IS_RESETTING) && SCpnt->device->soft_reset) {
- /* OK, this command must have died when we did the
- * reset. The device itself must have lied.
- */
- printk("Stale command on %d %d:%d appears to have died when"
- " the bus was reset\n",
- SCpnt->channel, SCpnt->target, SCpnt->lun);
- }
- if (!host->host_busy) {
- SCpnt->internal_timeout &= ~IN_ABORT;
- update_timeout(SCpnt, oldto);
- return 0;
- }
- printk("scsi : aborting command due to timeout : pid %lu, scsi%d,"
- " channel %d, id %d, lun %d ",
- SCpnt->pid, SCpnt->host->host_no, (int) SCpnt->channel,
- (int) SCpnt->target, (int) SCpnt->lun);
- print_command(SCpnt->cmnd);
- if (SCpnt->serial_number != SCpnt->serial_number_at_timeout)
- return 0;
- SCpnt->abort_reason = why;
- switch (host->hostt->abort(SCpnt)) {
- /* We do not know how to abort. Try waiting another
- * time increment and see if this helps. Set the
- * WAS_TIMEDOUT flag set so we do not try this twice
- */
- case SCSI_ABORT_BUSY: /* Tough call - returning 1 from
- * this is too severe
- */
- case SCSI_ABORT_SNOOZE:
- if (why == DID_TIME_OUT) {
- SCpnt->internal_timeout &= ~IN_ABORT;
- if (SCpnt->flags & WAS_TIMEDOUT) {
- return 1; /* Indicate we cannot handle this.
- * We drop down into the reset handler
- * and try again
- */
- } else {
- SCpnt->flags |= WAS_TIMEDOUT;
- oldto = SCpnt->timeout_per_command;
- update_timeout(SCpnt, oldto);
- }
- }
- return 0;
- case SCSI_ABORT_PENDING:
- if (why != DID_TIME_OUT) {
- update_timeout(SCpnt, oldto);
- }
- return 0;
- case SCSI_ABORT_SUCCESS:
- /* We should have already aborted this one. No
- * need to adjust timeout
- */
- SCpnt->internal_timeout &= ~IN_ABORT;
- return 0;
- case SCSI_ABORT_NOT_RUNNING:
- SCpnt->internal_timeout &= ~IN_ABORT;
- update_timeout(SCpnt, 0);
- return 0;
- case SCSI_ABORT_ERROR:
- default:
- SCpnt->internal_timeout &= ~IN_ABORT;
- return 1;
- }
- }
- }
-}
-
-
-/* Mark a single SCSI Device as having been reset. */
-
-static inline void scsi_mark_device_reset(Scsi_Device * Device)
-{
- Device->was_reset = 1;
- Device->expecting_cc_ua = 1;
-}
-
-
-/* Mark all SCSI Devices on a specific Host as having been reset. */
-
-void scsi_mark_host_reset(struct Scsi_Host *Host)
-{
- Scsi_Cmnd *SCpnt;
- Scsi_Device *SDpnt;
-
- for (SDpnt = Host->host_queue; SDpnt; SDpnt = SDpnt->next) {
- for (SCpnt = SDpnt->device_queue; SCpnt; SCpnt = SCpnt->next)
- scsi_mark_device_reset(SCpnt->device);
- }
-}
-
-
-/* Mark all SCSI Devices on a specific Host Bus as having been reset. */
-
-static void scsi_mark_bus_reset(struct Scsi_Host *Host, int channel)
-{
- Scsi_Cmnd *SCpnt;
- Scsi_Device *SDpnt;
-
- for (SDpnt = Host->host_queue; SDpnt; SDpnt = SDpnt->next) {
- for (SCpnt = SDpnt->device_queue; SCpnt; SCpnt = SCpnt->next)
- if (SCpnt->channel == channel)
- scsi_mark_device_reset(SCpnt->device);
- }
-}
-
-
-static int scsi_reset(Scsi_Cmnd * SCpnt, unsigned int reset_flags)
-{
- int temp;
- Scsi_Cmnd *SCpnt1;
- Scsi_Device *SDpnt;
- struct Scsi_Host *host = SCpnt->host;
-
- printk("SCSI bus is being reset for host %d channel %d.\n",
- host->host_no, SCpnt->channel);
-
-#if 0
- /*
- * First of all, we need to make a recommendation to the low-level
- * driver as to whether a BUS_DEVICE_RESET should be performed,
- * or whether we should do a full BUS_RESET. There is no simple
- * algorithm here - we basically use a series of heuristics
- * to determine what we should do.
- */
- SCpnt->host->suggest_bus_reset = FALSE;
-
- /*
- * First see if all of the active devices on the bus have
- * been jammed up so that we are attempting resets. If so,
- * then suggest a bus reset. Forcing a bus reset could
- * result in some race conditions, but no more than
- * you would usually get with timeouts. We will cross
- * that bridge when we come to it.
- *
- * This is actually a pretty bad idea, since a sequence of
- * commands will often timeout together and this will cause a
- * Bus Device Reset followed immediately by a SCSI Bus Reset.
- * If all of the active devices really are jammed up, the
- * Bus Device Reset will quickly timeout and scsi_times_out
- * will follow up with a SCSI Bus Reset anyway.
- */
- SCpnt1 = host->host_queue;
- while (SCpnt1) {
- if (SCpnt1->request.rq_status != RQ_INACTIVE
- && (SCpnt1->flags & (WAS_RESET | IS_RESETTING)) == 0)
- break;
- SCpnt1 = SCpnt1->next;
- }
- if (SCpnt1 == NULL) {
- reset_flags |= SCSI_RESET_SUGGEST_BUS_RESET;
- }
- /*
- * If the code that called us is suggesting a hard reset, then
- * definitely request it. This usually occurs because a
- * BUS_DEVICE_RESET times out.
- *
- * Passing reset_flags along takes care of this automatically.
- */
- if (reset_flags & SCSI_RESET_SUGGEST_BUS_RESET) {
- SCpnt->host->suggest_bus_reset = TRUE;
- }
-#endif
-
- while (1) {
-
- /*
- * Protect against races here. If the command is done, or we are
- * on a different command forget it.
- */
- if (reset_flags & SCSI_RESET_ASYNCHRONOUS)
- if (SCpnt->serial_number != SCpnt->serial_number_at_timeout) {
- return 0;
- }
- if (SCpnt->internal_timeout & IN_RESET) {
- spin_unlock_irq(&io_request_lock);
- while (SCpnt->internal_timeout & IN_RESET)
- barrier();
- spin_lock_irq(&io_request_lock);
- } else {
- SCpnt->internal_timeout |= IN_RESET;
- update_timeout(SCpnt, RESET_TIMEOUT);
-
- if (reset_flags & SCSI_RESET_SYNCHRONOUS)
- SCpnt->flags |= SYNC_RESET;
- if (host->host_busy) {
- for (SDpnt = host->host_queue; SDpnt; SDpnt = SDpnt->next) {
- SCpnt1 = SDpnt->device_queue;
- while (SCpnt1) {
- if (SCpnt1->request.rq_status != RQ_INACTIVE) {
-#if 0
- if (!(SCpnt1->flags & IS_RESETTING) &&
- !(SCpnt1->internal_timeout & IN_ABORT))
- scsi_abort(SCpnt1, DID_RESET);
-#endif
- SCpnt1->flags |= (WAS_RESET | IS_RESETTING);
- }
- SCpnt1 = SCpnt1->next;
- }
- }
-
- host->last_reset = jiffies;
- host->resetting = 1;
- /*
- * I suppose that the host reset callback will not play
- * with the resetting field. We have just set the resetting
- * flag here. -arca
- */
- temp = host->hostt->reset(SCpnt, reset_flags);
- /*
- This test allows the driver to introduce an additional bus
- settle time delay by setting last_reset up to 20 seconds in
- the future. In the normal case where the driver does not
- modify last_reset, it must be assumed that the actual bus
- reset occurred immediately prior to the return to this code,
- and so last_reset must be updated to the current time, so
- that the delay in internal_cmnd will guarantee at least a
- MIN_RESET_DELAY bus settle time.
- */
- if (host->last_reset - jiffies > 20UL * HZ)
- host->last_reset = jiffies;
- } else {
- host->host_busy++;
- host->last_reset = jiffies;
- host->resetting = 1;
- SCpnt->flags |= (WAS_RESET | IS_RESETTING);
- /*
- * I suppose that the host reset callback will not play
- * with the resetting field. We have just set the resetting
- * flag here. -arca
- */
- temp = host->hostt->reset(SCpnt, reset_flags);
- if (time_before(host->last_reset, jiffies) ||
- (time_after(host->last_reset, jiffies + 20 * HZ)))
- host->last_reset = jiffies;
- host->host_busy--;
- }
- if (reset_flags & SCSI_RESET_SYNCHRONOUS)
- SCpnt->flags &= ~SYNC_RESET;
-
-#ifdef DEBUG
- printk("scsi reset function returned %d\n", temp);
-#endif
-
- /*
- * Now figure out what we need to do, based upon
- * what the low level driver said that it did.
- * If the result is SCSI_RESET_SUCCESS, SCSI_RESET_PENDING,
- * or SCSI_RESET_WAKEUP, then the low level driver did a
- * bus device reset or bus reset, so we should go through
- * and mark one or all of the devices on that bus
- * as having been reset.
- */
- switch (temp & SCSI_RESET_ACTION) {
- case SCSI_RESET_SUCCESS:
- if (temp & SCSI_RESET_HOST_RESET)
- scsi_mark_host_reset(host);
- else if (temp & SCSI_RESET_BUS_RESET)
- scsi_mark_bus_reset(host, SCpnt->channel);
- else
- scsi_mark_device_reset(SCpnt->device);
- SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
- return 0;
- case SCSI_RESET_PENDING:
- if (temp & SCSI_RESET_HOST_RESET)
- scsi_mark_host_reset(host);
- else if (temp & SCSI_RESET_BUS_RESET)
- scsi_mark_bus_reset(host, SCpnt->channel);
- else
- scsi_mark_device_reset(SCpnt->device);
- case SCSI_RESET_NOT_RUNNING:
- return 0;
- case SCSI_RESET_PUNT:
- SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
- scsi_request_sense(SCpnt);
- return 0;
- case SCSI_RESET_WAKEUP:
- if (temp & SCSI_RESET_HOST_RESET)
- scsi_mark_host_reset(host);
- else if (temp & SCSI_RESET_BUS_RESET)
- scsi_mark_bus_reset(host, SCpnt->channel);
- else
- scsi_mark_device_reset(SCpnt->device);
- SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
- scsi_request_sense(SCpnt);
- /*
- * If a bus reset was performed, we
- * need to wake up each and every command
- * that was active on the bus or if it was a HBA
- * reset all active commands on all channels
- */
- if (temp & SCSI_RESET_HOST_RESET) {
- for (SDpnt = host->host_queue; SDpnt; SDpnt = SDpnt->next) {
- SCpnt1 = SDpnt->device_queue;
- while (SCpnt1) {
- if (SCpnt1->request.rq_status != RQ_INACTIVE
- && SCpnt1 != SCpnt)
- scsi_request_sense(SCpnt1);
- SCpnt1 = SCpnt1->next;
- }
- }
- } else if (temp & SCSI_RESET_BUS_RESET) {
- for (SDpnt = host->host_queue; SDpnt; SDpnt = SDpnt->next) {
- SCpnt1 = SDpnt->device_queue;
- while (SCpnt1) {
- if (SCpnt1->request.rq_status != RQ_INACTIVE
- && SCpnt1 != SCpnt
- && SCpnt1->channel == SCpnt->channel)
- scsi_request_sense(SCpnt);
- SCpnt1 = SCpnt1->next;
- }
- }
- }
- return 0;
- case SCSI_RESET_SNOOZE:
- /* In this case, we set the timeout field to 0
- * so that this command does not time out any more,
- * and we return 1 so that we get a message on the
- * screen.
- */
- SCpnt->internal_timeout &= ~(IN_RESET | IN_RESET2 | IN_RESET3);
- update_timeout(SCpnt, 0);
- /* If you snooze, you lose... */
- case SCSI_RESET_ERROR:
- default:
- return 1;
- }
-
- return temp;
- }
- }
-}
-
-/*
- * The strategy is to cause the timer code to call scsi_times_out()
- * when the soonest timeout is pending.
- * The arguments are used when we are queueing a new command, because
- * we do not want to subtract the time used from this time, but when we
- * set the timer, we want to take this value into account.
- */
-
-int update_timeout(Scsi_Cmnd * SCset, int timeout)
-{
- int rtn;
-
- /*
- * We are using the new error handling code to actually register/deregister
- * timers for timeout.
- */
-
- if (!timer_pending(&SCset->eh_timeout)) {
- rtn = 0;
- } else {
- rtn = SCset->eh_timeout.expires - jiffies;
- }
-
- if (timeout == 0) {
- scsi_delete_timer(SCset);
- } else {
- scsi_add_timer(SCset, timeout, scsi_old_times_out);
- }
-
- return rtn;
-}
-
-
-/*
- * This function exports SCSI Bus, Device or Host reset capability
- * and is for use with the SCSI generic driver.
- */
-int
-scsi_old_reset(Scsi_Cmnd *SCpnt, unsigned int flag)
-{
- unsigned int old_flags = SCSI_RESET_SYNCHRONOUS;
-
- switch(flag) {
- case SCSI_TRY_RESET_DEVICE:
- /* no suggestion flags to add, device reset is default */
- break;
- case SCSI_TRY_RESET_BUS:
- old_flags |= SCSI_RESET_SUGGEST_BUS_RESET;
- break;
- case SCSI_TRY_RESET_HOST:
- old_flags |= SCSI_RESET_SUGGEST_HOST_RESET;
- break;
- default:
- return FAILED;
- }
-
- if (scsi_reset(SCpnt, old_flags))
- return FAILED;
- return SUCCESS;
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-indent-level: 4
- * c-brace-imaginary-offset: 0
- * c-brace-offset: -4
- * c-argdecl-indent: 4
- * c-label-offset: -4
- * c-continued-statement-offset: 4
- * c-continued-brace-offset: 0
- * indent-tabs-mode: nil
- * tab-width: 8
- * End:
- */
projects / xen.git / commitdiff