830 lines
22 KiB
C
830 lines
22 KiB
C
/*
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* Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
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* Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
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*/
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/*
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* Emulation of a SCSI host adapter for IDE ATAPI devices.
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*
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* With this driver, one can use the Linux SCSI drivers instead of the
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* native IDE ATAPI drivers.
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*
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* Ver 0.1 Dec 3 96 Initial version.
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* Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
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* of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
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* to Janos Farkas for pointing this out.
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* Avoid using bitfields in structures for m68k.
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* Added Scatter/Gather and DMA support.
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* Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
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* Use variable timeout for each command.
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* Ver 0.5 Jan 2 98 Fix previous PD/CD support.
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* Allow disabling of SCSI-6 to SCSI-10 transformation.
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* Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
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* for access through /dev/sg.
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* Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
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* Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
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* detection of devices with CONFIG_SCSI_MULTI_LUN
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* Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
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* Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
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* Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
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* Ver 0.92 Dec 31 02 Implement new SCSI mid level API
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*/
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#define IDESCSI_VERSION "0.92"
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/ide.h>
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#include <linux/scatterlist.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/bitops.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/sg.h>
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#define IDESCSI_DEBUG_LOG 0
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#if IDESCSI_DEBUG_LOG
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#define debug_log(fmt, args...) \
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printk(KERN_INFO "ide-scsi: " fmt, ## args)
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#else
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#define debug_log(fmt, args...) do {} while (0)
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#endif
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/*
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* SCSI command transformation layer
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*/
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#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
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/*
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* Log flags
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*/
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#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
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typedef struct ide_scsi_obj {
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ide_drive_t *drive;
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ide_driver_t *driver;
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struct gendisk *disk;
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struct Scsi_Host *host;
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unsigned long transform; /* SCSI cmd translation layer */
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unsigned long log; /* log flags */
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} idescsi_scsi_t;
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static DEFINE_MUTEX(idescsi_ref_mutex);
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/* Set by module param to skip cd */
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static int idescsi_nocd;
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#define ide_scsi_g(disk) \
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container_of((disk)->private_data, struct ide_scsi_obj, driver)
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static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
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{
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struct ide_scsi_obj *scsi = NULL;
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mutex_lock(&idescsi_ref_mutex);
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scsi = ide_scsi_g(disk);
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if (scsi) {
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if (ide_device_get(scsi->drive))
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scsi = NULL;
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else
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scsi_host_get(scsi->host);
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}
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mutex_unlock(&idescsi_ref_mutex);
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return scsi;
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}
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static void ide_scsi_put(struct ide_scsi_obj *scsi)
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{
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ide_drive_t *drive = scsi->drive;
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mutex_lock(&idescsi_ref_mutex);
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scsi_host_put(scsi->host);
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ide_device_put(drive);
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mutex_unlock(&idescsi_ref_mutex);
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}
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static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
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{
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return (idescsi_scsi_t*) (&host[1]);
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}
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static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
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{
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return scsihost_to_idescsi(ide_drive->driver_data);
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}
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static void ide_scsi_hex_dump(u8 *data, int len)
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{
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print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
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}
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static int idescsi_end_request(ide_drive_t *, int, int);
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static void ide_scsi_callback(ide_drive_t *drive, int dsc)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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struct ide_atapi_pc *pc = drive->pc;
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if (pc->flags & PC_FLAG_TIMEDOUT)
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debug_log("%s: got timed out packet %lu at %lu\n", __func__,
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pc->scsi_cmd->serial_number, jiffies);
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/* end this request now - scsi should retry it*/
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else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
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printk(KERN_INFO "Packet command completed, %d bytes"
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" transferred\n", pc->xferred);
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idescsi_end_request(drive, 1, 0);
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}
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static int idescsi_check_condition(ide_drive_t *drive,
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struct request *failed_cmd)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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struct ide_atapi_pc *pc;
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struct request *rq;
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u8 *buf;
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/* stuff a sense request in front of our current request */
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pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
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rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
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buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
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if (!pc || !rq || !buf) {
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kfree(buf);
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if (rq)
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blk_put_request(rq);
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kfree(pc);
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return -ENOMEM;
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}
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rq->special = (char *) pc;
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pc->rq = rq;
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pc->buf = buf;
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pc->c[0] = REQUEST_SENSE;
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pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
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rq->cmd_type = REQ_TYPE_SENSE;
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rq->cmd_flags |= REQ_PREEMPT;
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pc->timeout = jiffies + WAIT_READY;
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/* NOTE! Save the failed packet command in "rq->buffer" */
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rq->buffer = (void *) failed_cmd->special;
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pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
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if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
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printk ("ide-scsi: %s: queue cmd = ", drive->name);
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ide_scsi_hex_dump(pc->c, 6);
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}
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rq->rq_disk = scsi->disk;
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rq->ref_count++;
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memcpy(rq->cmd, pc->c, 12);
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ide_do_drive_cmd(drive, rq);
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return 0;
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}
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static ide_startstop_t
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idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
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{
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ide_hwif_t *hwif = drive->hwif;
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if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ))
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/* force an abort */
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hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE);
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rq->errors++;
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idescsi_end_request(drive, 0, 0);
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return ide_stopped;
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}
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static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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struct request *rq = HWGROUP(drive)->rq;
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struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
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int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
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struct Scsi_Host *host;
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int errors = rq->errors;
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unsigned long flags;
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if (!blk_special_request(rq) && !blk_sense_request(rq)) {
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ide_end_request(drive, uptodate, nrsecs);
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return 0;
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}
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ide_end_drive_cmd (drive, 0, 0);
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if (blk_sense_request(rq)) {
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struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
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if (log) {
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printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
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ide_scsi_hex_dump(pc->buf, 16);
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}
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memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
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SCSI_SENSE_BUFFERSIZE);
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kfree(pc->buf);
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kfree(pc);
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blk_put_request(rq);
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pc = opc;
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rq = pc->rq;
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pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
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(((pc->flags & PC_FLAG_TIMEDOUT) ?
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DID_TIME_OUT :
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DID_OK) << 16);
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} else if (pc->flags & PC_FLAG_TIMEDOUT) {
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if (log)
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printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
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drive->name, pc->scsi_cmd->serial_number);
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pc->scsi_cmd->result = DID_TIME_OUT << 16;
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} else if (errors >= ERROR_MAX) {
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pc->scsi_cmd->result = DID_ERROR << 16;
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if (log)
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printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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} else if (errors) {
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if (log)
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printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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if (!idescsi_check_condition(drive, rq))
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/* we started a request sense, so we'll be back, exit for now */
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return 0;
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pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
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} else {
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pc->scsi_cmd->result = DID_OK << 16;
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}
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host = pc->scsi_cmd->device->host;
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spin_lock_irqsave(host->host_lock, flags);
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pc->done(pc->scsi_cmd);
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spin_unlock_irqrestore(host->host_lock, flags);
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kfree(pc);
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blk_put_request(rq);
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drive->pc = NULL;
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return 0;
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}
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static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
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{
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switch (pc->c[0]) {
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case READ_6: case READ_10: case READ_12:
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pc->flags &= ~PC_FLAG_WRITING;
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return 0;
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case WRITE_6: case WRITE_10: case WRITE_12:
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pc->flags |= PC_FLAG_WRITING;
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return 0;
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default:
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return 1;
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}
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}
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static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct scatterlist *sg, *scsi_sg;
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int segments;
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if (!pc->req_xfer || pc->req_xfer % 1024)
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return 1;
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if (idescsi_set_direction(pc))
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return 1;
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sg = hwif->sg_table;
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scsi_sg = scsi_sglist(pc->scsi_cmd);
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segments = scsi_sg_count(pc->scsi_cmd);
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if (segments > hwif->sg_max_nents)
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return 1;
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hwif->sg_nents = segments;
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memcpy(sg, scsi_sg, sizeof(*sg) * segments);
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return 0;
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}
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static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
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struct ide_atapi_pc *pc)
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{
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/* Set the current packet command */
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drive->pc = pc;
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return ide_issue_pc(drive, ide_scsi_get_timeout(pc), ide_scsi_expiry);
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}
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/*
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* idescsi_do_request is our request handling function.
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*/
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static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
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{
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debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
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rq->cmd[0], rq->errors);
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debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
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rq->sector, rq->nr_sectors, rq->current_nr_sectors);
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if (blk_sense_request(rq) || blk_special_request(rq)) {
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struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
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if ((drive->dev_flags & IDE_DFLAG_USING_DMA) &&
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idescsi_map_sg(drive, pc) == 0)
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pc->flags |= PC_FLAG_DMA_OK;
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return idescsi_issue_pc(drive, pc);
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}
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blk_dump_rq_flags(rq, "ide-scsi: unsup command");
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idescsi_end_request (drive, 0, 0);
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return ide_stopped;
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}
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#ifdef CONFIG_IDE_PROC_FS
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static ide_proc_entry_t idescsi_proc[] = {
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{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
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{ NULL, 0, NULL, NULL }
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};
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#define ide_scsi_devset_get(name, field) \
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static int get_##name(ide_drive_t *drive) \
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{ \
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idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
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return scsi->field; \
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}
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#define ide_scsi_devset_set(name, field) \
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static int set_##name(ide_drive_t *drive, int arg) \
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{ \
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idescsi_scsi_t *scsi = drive_to_idescsi(drive); \
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scsi->field = arg; \
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return 0; \
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}
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#define ide_scsi_devset_rw_field(_name, _field) \
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ide_scsi_devset_get(_name, _field); \
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ide_scsi_devset_set(_name, _field); \
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IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name);
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ide_devset_rw_field(bios_cyl, bios_cyl);
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ide_devset_rw_field(bios_head, bios_head);
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ide_devset_rw_field(bios_sect, bios_sect);
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ide_scsi_devset_rw_field(transform, transform);
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ide_scsi_devset_rw_field(log, log);
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static const struct ide_proc_devset idescsi_settings[] = {
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IDE_PROC_DEVSET(bios_cyl, 0, 1023),
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IDE_PROC_DEVSET(bios_head, 0, 255),
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IDE_PROC_DEVSET(bios_sect, 0, 63),
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IDE_PROC_DEVSET(log, 0, 1),
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IDE_PROC_DEVSET(transform, 0, 3),
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{ 0 },
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};
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static ide_proc_entry_t *ide_scsi_proc_entries(ide_drive_t *drive)
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{
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return idescsi_proc;
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}
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static const struct ide_proc_devset *ide_scsi_proc_devsets(ide_drive_t *drive)
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{
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return idescsi_settings;
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}
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#endif
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/*
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* Driver initialization.
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*/
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static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
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{
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clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
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#if IDESCSI_DEBUG_LOG
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set_bit(IDESCSI_LOG_CMD, &scsi->log);
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#endif /* IDESCSI_DEBUG_LOG */
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drive->pc_callback = ide_scsi_callback;
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drive->pc_update_buffers = NULL;
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drive->pc_io_buffers = ide_io_buffers;
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ide_proc_register_driver(drive, scsi->driver);
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}
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static void ide_scsi_remove(ide_drive_t *drive)
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{
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struct Scsi_Host *scsihost = drive->driver_data;
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struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
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struct gendisk *g = scsi->disk;
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scsi_remove_host(scsihost);
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ide_proc_unregister_driver(drive, scsi->driver);
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ide_unregister_region(g);
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drive->driver_data = NULL;
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g->private_data = NULL;
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put_disk(g);
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ide_scsi_put(scsi);
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drive->dev_flags &= ~IDE_DFLAG_SCSI;
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}
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static int ide_scsi_probe(ide_drive_t *);
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static ide_driver_t idescsi_driver = {
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.gen_driver = {
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.owner = THIS_MODULE,
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.name = "ide-scsi",
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.bus = &ide_bus_type,
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},
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.probe = ide_scsi_probe,
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.remove = ide_scsi_remove,
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.version = IDESCSI_VERSION,
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.do_request = idescsi_do_request,
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.end_request = idescsi_end_request,
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.error = idescsi_atapi_error,
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#ifdef CONFIG_IDE_PROC_FS
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.proc_entries = ide_scsi_proc_entries,
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.proc_devsets = ide_scsi_proc_devsets,
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#endif
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};
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static int idescsi_ide_open(struct block_device *bdev, fmode_t mode)
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{
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struct ide_scsi_obj *scsi = ide_scsi_get(bdev->bd_disk);
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if (!scsi)
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return -ENXIO;
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return 0;
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}
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static int idescsi_ide_release(struct gendisk *disk, fmode_t mode)
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{
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ide_scsi_put(ide_scsi_g(disk));
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return 0;
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}
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static int idescsi_ide_ioctl(struct block_device *bdev, fmode_t mode,
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|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
|
|
return generic_ide_ioctl(scsi->drive, bdev, cmd, arg);
|
|
}
|
|
|
|
static struct block_device_operations idescsi_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = idescsi_ide_open,
|
|
.release = idescsi_ide_release,
|
|
.locked_ioctl = idescsi_ide_ioctl,
|
|
};
|
|
|
|
static int idescsi_slave_configure(struct scsi_device * sdp)
|
|
{
|
|
/* Configure detected device */
|
|
sdp->use_10_for_rw = 1;
|
|
sdp->use_10_for_ms = 1;
|
|
scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
|
|
return 0;
|
|
}
|
|
|
|
static const char *idescsi_info (struct Scsi_Host *host)
|
|
{
|
|
return "SCSI host adapter emulation for IDE ATAPI devices";
|
|
}
|
|
|
|
static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
|
|
{
|
|
idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
|
|
|
|
if (cmd == SG_SET_TRANSFORM) {
|
|
if (arg)
|
|
set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
|
|
else
|
|
clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
|
|
return 0;
|
|
} else if (cmd == SG_GET_TRANSFORM)
|
|
return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int idescsi_queue (struct scsi_cmnd *cmd,
|
|
void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
|
|
ide_drive_t *drive = scsi->drive;
|
|
struct request *rq = NULL;
|
|
struct ide_atapi_pc *pc = NULL;
|
|
int write = cmd->sc_data_direction == DMA_TO_DEVICE;
|
|
|
|
if (!drive) {
|
|
scmd_printk (KERN_ERR, cmd, "drive not present\n");
|
|
goto abort;
|
|
}
|
|
scsi = drive_to_idescsi(drive);
|
|
pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
|
|
rq = blk_get_request(drive->queue, write, GFP_ATOMIC);
|
|
if (rq == NULL || pc == NULL) {
|
|
printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
|
|
goto abort;
|
|
}
|
|
|
|
memset (pc->c, 0, 12);
|
|
pc->flags = 0;
|
|
if (cmd->sc_data_direction == DMA_TO_DEVICE)
|
|
pc->flags |= PC_FLAG_WRITING;
|
|
pc->rq = rq;
|
|
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
|
|
pc->buf = NULL;
|
|
pc->sg = scsi_sglist(cmd);
|
|
pc->sg_cnt = scsi_sg_count(cmd);
|
|
pc->b_count = 0;
|
|
pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
|
|
pc->scsi_cmd = cmd;
|
|
pc->done = done;
|
|
pc->timeout = jiffies + cmd->request->timeout;
|
|
|
|
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
|
|
printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
|
|
ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
|
|
if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
|
|
printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
|
|
ide_scsi_hex_dump(pc->c, 12);
|
|
}
|
|
}
|
|
|
|
rq->special = (char *) pc;
|
|
rq->cmd_type = REQ_TYPE_SPECIAL;
|
|
spin_unlock_irq(host->host_lock);
|
|
rq->ref_count++;
|
|
memcpy(rq->cmd, pc->c, 12);
|
|
blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
|
|
spin_lock_irq(host->host_lock);
|
|
return 0;
|
|
abort:
|
|
kfree (pc);
|
|
if (rq)
|
|
blk_put_request(rq);
|
|
cmd->result = DID_ERROR << 16;
|
|
done(cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int idescsi_eh_abort (struct scsi_cmnd *cmd)
|
|
{
|
|
idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
|
|
ide_drive_t *drive = scsi->drive;
|
|
int busy;
|
|
int ret = FAILED;
|
|
|
|
struct ide_atapi_pc *pc;
|
|
|
|
/* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
|
|
|
|
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
|
|
printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
|
|
|
|
if (!drive) {
|
|
printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
|
|
WARN_ON(1);
|
|
goto no_drive;
|
|
}
|
|
|
|
/* First give it some more time, how much is "right" is hard to say :-( */
|
|
|
|
busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
|
|
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
|
|
printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
|
|
|
|
spin_lock_irq(&ide_lock);
|
|
|
|
/* If there is no pc running we're done (our interrupt took care of it) */
|
|
pc = drive->pc;
|
|
if (pc == NULL) {
|
|
ret = SUCCESS;
|
|
goto ide_unlock;
|
|
}
|
|
|
|
/* It's somewhere in flight. Does ide subsystem agree? */
|
|
if (pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
|
|
elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != pc->rq) {
|
|
/*
|
|
* FIXME - not sure this condition can ever occur
|
|
*/
|
|
printk (KERN_ERR "ide-scsi: cmd aborted!\n");
|
|
|
|
if (blk_sense_request(pc->rq))
|
|
kfree(pc->buf);
|
|
/* we need to call blk_put_request twice. */
|
|
blk_put_request(pc->rq);
|
|
blk_put_request(pc->rq);
|
|
kfree(pc);
|
|
drive->pc = NULL;
|
|
|
|
ret = SUCCESS;
|
|
}
|
|
|
|
ide_unlock:
|
|
spin_unlock_irq(&ide_lock);
|
|
no_drive:
|
|
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
|
|
printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int idescsi_eh_reset (struct scsi_cmnd *cmd)
|
|
{
|
|
struct request *req;
|
|
idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
|
|
ide_drive_t *drive = scsi->drive;
|
|
int ready = 0;
|
|
int ret = SUCCESS;
|
|
|
|
struct ide_atapi_pc *pc;
|
|
|
|
/* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
|
|
|
|
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
|
|
printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
|
|
|
|
if (!drive) {
|
|
printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
|
|
WARN_ON(1);
|
|
return FAILED;
|
|
}
|
|
|
|
spin_lock_irq(cmd->device->host->host_lock);
|
|
spin_lock(&ide_lock);
|
|
|
|
pc = drive->pc;
|
|
|
|
if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
|
|
printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
|
|
spin_unlock(&ide_lock);
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
return FAILED;
|
|
}
|
|
|
|
/* kill current request */
|
|
if (__blk_end_request(req, -EIO, 0))
|
|
BUG();
|
|
if (blk_sense_request(req))
|
|
kfree(pc->buf);
|
|
kfree(pc);
|
|
drive->pc = NULL;
|
|
blk_put_request(req);
|
|
|
|
/* now nuke the drive queue */
|
|
while ((req = elv_next_request(drive->queue))) {
|
|
if (__blk_end_request(req, -EIO, 0))
|
|
BUG();
|
|
}
|
|
|
|
HWGROUP(drive)->rq = NULL;
|
|
HWGROUP(drive)->handler = NULL;
|
|
HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
|
|
spin_unlock(&ide_lock);
|
|
|
|
ide_do_reset(drive);
|
|
|
|
/* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
|
|
|
|
do {
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
msleep(50);
|
|
spin_lock_irq(cmd->device->host->host_lock);
|
|
} while ( HWGROUP(drive)->handler );
|
|
|
|
ready = drive_is_ready(drive);
|
|
HWGROUP(drive)->busy--;
|
|
if (!ready) {
|
|
printk (KERN_ERR "ide-scsi: reset failed!\n");
|
|
ret = FAILED;
|
|
}
|
|
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
|
|
sector_t capacity, int *parm)
|
|
{
|
|
idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
|
|
ide_drive_t *drive = idescsi->drive;
|
|
|
|
if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
|
|
parm[0] = drive->bios_head;
|
|
parm[1] = drive->bios_sect;
|
|
parm[2] = drive->bios_cyl;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_host_template idescsi_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "idescsi",
|
|
.info = idescsi_info,
|
|
.slave_configure = idescsi_slave_configure,
|
|
.ioctl = idescsi_ioctl,
|
|
.queuecommand = idescsi_queue,
|
|
.eh_abort_handler = idescsi_eh_abort,
|
|
.eh_host_reset_handler = idescsi_eh_reset,
|
|
.bios_param = idescsi_bios,
|
|
.can_queue = 40,
|
|
.this_id = -1,
|
|
.sg_tablesize = 256,
|
|
.cmd_per_lun = 5,
|
|
.max_sectors = 128,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
.emulated = 1,
|
|
.proc_name = "ide-scsi",
|
|
};
|
|
|
|
static int ide_scsi_probe(ide_drive_t *drive)
|
|
{
|
|
idescsi_scsi_t *idescsi;
|
|
struct Scsi_Host *host;
|
|
struct gendisk *g;
|
|
static int warned;
|
|
int err = -ENOMEM;
|
|
u16 last_lun;
|
|
|
|
if (!warned && drive->media == ide_cdrom) {
|
|
printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
|
|
warned = 1;
|
|
}
|
|
|
|
if (idescsi_nocd && drive->media == ide_cdrom)
|
|
return -ENODEV;
|
|
|
|
if (!strstr("ide-scsi", drive->driver_req) ||
|
|
drive->media == ide_disk ||
|
|
!(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
|
|
return -ENODEV;
|
|
|
|
drive->dev_flags |= IDE_DFLAG_SCSI;
|
|
|
|
g = alloc_disk(1 << PARTN_BITS);
|
|
if (!g)
|
|
goto out_host_put;
|
|
|
|
ide_init_disk(g, drive);
|
|
|
|
host->max_id = 1;
|
|
|
|
last_lun = drive->id[ATA_ID_LAST_LUN];
|
|
if (last_lun)
|
|
debug_log("%s: last_lun=%u\n", drive->name, last_lun);
|
|
|
|
if ((last_lun & 7) != 7)
|
|
host->max_lun = (last_lun & 7) + 1;
|
|
else
|
|
host->max_lun = 1;
|
|
|
|
drive->driver_data = host;
|
|
idescsi = scsihost_to_idescsi(host);
|
|
idescsi->drive = drive;
|
|
idescsi->driver = &idescsi_driver;
|
|
idescsi->host = host;
|
|
idescsi->disk = g;
|
|
g->private_data = &idescsi->driver;
|
|
err = 0;
|
|
idescsi_setup(drive, idescsi);
|
|
g->fops = &idescsi_ops;
|
|
ide_register_region(g);
|
|
err = scsi_add_host(host, &drive->gendev);
|
|
if (!err) {
|
|
scsi_scan_host(host);
|
|
return 0;
|
|
}
|
|
/* fall through on error */
|
|
ide_unregister_region(g);
|
|
ide_proc_unregister_driver(drive, &idescsi_driver);
|
|
|
|
put_disk(g);
|
|
out_host_put:
|
|
drive->dev_flags &= ~IDE_DFLAG_SCSI;
|
|
scsi_host_put(host);
|
|
return err;
|
|
}
|
|
|
|
static int __init init_idescsi_module(void)
|
|
{
|
|
return driver_register(&idescsi_driver.gen_driver);
|
|
}
|
|
|
|
static void __exit exit_idescsi_module(void)
|
|
{
|
|
driver_unregister(&idescsi_driver.gen_driver);
|
|
}
|
|
|
|
module_param(idescsi_nocd, int, 0600);
|
|
MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
|
|
module_init(init_idescsi_module);
|
|
module_exit(exit_idescsi_module);
|
|
MODULE_LICENSE("GPL");
|