/* * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999 * * Copyright (C) 1996 - 1999 Gadi Oxman */ /* * Emulation of a SCSI host adapter for IDE ATAPI devices. * * With this driver, one can use the Linux SCSI drivers instead of the * native IDE ATAPI drivers. * * Ver 0.1 Dec 3 96 Initial version. * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks * to Janos Farkas for pointing this out. * Avoid using bitfields in structures for m68k. * Added Scatter/Gather and DMA support. * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives. * Use variable timeout for each command. * Ver 0.5 Jan 2 98 Fix previous PD/CD support. * Allow disabling of SCSI-6 to SCSI-10 transformation. * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer * for access through /dev/sg. * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation. * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple * detection of devices with CONFIG_SCSI_MULTI_LUN * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7. * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM. * Ver 0.91 Jun 10 02 Fix "off by one" error in transforms * Ver 0.92 Dec 31 02 Implement new SCSI mid level API */ #define IDESCSI_VERSION "0.92" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define IDESCSI_DEBUG_LOG 0 typedef struct idescsi_pc_s { u8 c[12]; /* Actual packet bytes */ int request_transfer; /* Bytes to transfer */ int actually_transferred; /* Bytes actually transferred */ int buffer_size; /* Size of our data buffer */ struct request *rq; /* The corresponding request */ u8 *buffer; /* Data buffer */ u8 *current_position; /* Pointer into the above buffer */ struct scatterlist *sg; /* Scatter gather table */ unsigned int sg_cnt; /* Number of entries in sg */ int b_count; /* Bytes transferred from current entry */ struct scsi_cmnd *scsi_cmd; /* SCSI command */ void (*done)(struct scsi_cmnd *); /* Scsi completion routine */ unsigned long flags; /* Status/Action flags */ unsigned long timeout; /* Command timeout */ } idescsi_pc_t; /* * Packet command status bits. */ #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */ #define PC_WRITING 1 /* Data direction */ #define PC_TIMEDOUT 3 /* command timed out */ #define PC_DMA_OK 4 /* Use DMA */ /* * SCSI command transformation layer */ #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */ /* * Log flags */ #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */ typedef struct ide_scsi_obj { ide_drive_t *drive; ide_driver_t *driver; struct gendisk *disk; struct Scsi_Host *host; idescsi_pc_t *pc; /* Current packet command */ unsigned long flags; /* Status/Action flags */ unsigned long transform; /* SCSI cmd translation layer */ unsigned long log; /* log flags */ } idescsi_scsi_t; static DEFINE_MUTEX(idescsi_ref_mutex); static int idescsi_nocd; /* Set by module param to skip cd */ #define ide_scsi_g(disk) \ container_of((disk)->private_data, struct ide_scsi_obj, driver) static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk) { struct ide_scsi_obj *scsi = NULL; mutex_lock(&idescsi_ref_mutex); scsi = ide_scsi_g(disk); if (scsi) scsi_host_get(scsi->host); mutex_unlock(&idescsi_ref_mutex); return scsi; } static void ide_scsi_put(struct ide_scsi_obj *scsi) { mutex_lock(&idescsi_ref_mutex); scsi_host_put(scsi->host); mutex_unlock(&idescsi_ref_mutex); } static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host) { return (idescsi_scsi_t*) (&host[1]); } static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive) { return scsihost_to_idescsi(ide_drive->driver_data); } /* * Per ATAPI device status bits. */ #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */ /* * ide-scsi requests. */ #define IDESCSI_PC_RQ 90 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount) { while (bcount--) (void) HWIF(drive)->INB(IDE_DATA_REG); } static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount) { while (bcount--) HWIF(drive)->OUTB(0, IDE_DATA_REG); } /* * PIO data transfer routines using the scatter gather table. */ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) { int count; char *buf; while (bcount) { count = min(pc->sg->length - pc->b_count, bcount); if (PageHighMem(sg_page(pc->sg))) { unsigned long flags; local_irq_save(flags); buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) + pc->sg->offset; drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count); kunmap_atomic(buf - pc->sg->offset, KM_IRQ0); local_irq_restore(flags); } else { buf = sg_virt(pc->sg); drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count); } bcount -= count; pc->b_count += count; if (pc->b_count == pc->sg->length) { if (!--pc->sg_cnt) break; pc->sg = sg_next(pc->sg); pc->b_count = 0; } } if (bcount) { printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n"); idescsi_discard_data (drive, bcount); } } static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) { int count; char *buf; while (bcount) { count = min(pc->sg->length - pc->b_count, bcount); if (PageHighMem(sg_page(pc->sg))) { unsigned long flags; local_irq_save(flags); buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) + pc->sg->offset; drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count); kunmap_atomic(buf - pc->sg->offset, KM_IRQ0); local_irq_restore(flags); } else { buf = sg_virt(pc->sg); drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count); } bcount -= count; pc->b_count += count; if (pc->b_count == pc->sg->length) { if (!--pc->sg_cnt) break; pc->sg = sg_next(pc->sg); pc->b_count = 0; } } if (bcount) { printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n"); idescsi_output_zeros (drive, bcount); } } static void ide_scsi_hex_dump(u8 *data, int len) { print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0); } static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command) { idescsi_scsi_t *scsi = drive_to_idescsi(drive); idescsi_pc_t *pc; struct request *rq; u8 *buf; /* stuff a sense request in front of our current request */ pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC); rq = kmalloc(sizeof(struct request), GFP_ATOMIC); buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC); if (!pc || !rq || !buf) { kfree(buf); kfree(rq); kfree(pc); return -ENOMEM; } ide_init_drive_cmd(rq); rq->special = (char *) pc; pc->rq = rq; pc->buffer = buf; pc->c[0] = REQUEST_SENSE; pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE; rq->cmd_type = REQ_TYPE_SENSE; pc->timeout = jiffies + WAIT_READY; /* NOTE! Save the failed packet command in "rq->buffer" */ rq->buffer = (void *) failed_command->special; pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd; if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { printk ("ide-scsi: %s: queue cmd = ", drive->name); ide_scsi_hex_dump(pc->c, 6); } rq->rq_disk = scsi->disk; return ide_do_drive_cmd(drive, rq, ide_preempt); } static int idescsi_end_request(ide_drive_t *, int, int); static ide_startstop_t idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err) { if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) /* force an abort */ HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); rq->errors++; idescsi_end_request(drive, 0, 0); return ide_stopped; } static ide_startstop_t idescsi_atapi_abort(ide_drive_t *drive, struct request *rq) { #if IDESCSI_DEBUG_LOG printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n", ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number); #endif rq->errors |= ERROR_MAX; idescsi_end_request(drive, 0, 0); return ide_stopped; } static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs) { idescsi_scsi_t *scsi = drive_to_idescsi(drive); struct request *rq = HWGROUP(drive)->rq; idescsi_pc_t *pc = (idescsi_pc_t *) rq->special; int log = test_bit(IDESCSI_LOG_CMD, &scsi->log); struct Scsi_Host *host; int errors = rq->errors; unsigned long flags; if (!blk_special_request(rq) && !blk_sense_request(rq)) { ide_end_request(drive, uptodate, nrsecs); return 0; } ide_end_drive_cmd (drive, 0, 0); if (blk_sense_request(rq)) { idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer; if (log) { printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number); ide_scsi_hex_dump(pc->buffer, 16); } memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE); kfree(pc->buffer); kfree(pc); kfree(rq); pc = opc; rq = pc->rq; pc->scsi_cmd->result = (CHECK_CONDITION << 1) | ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16); } else if (test_bit(PC_TIMEDOUT, &pc->flags)) { if (log) printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n", drive->name, pc->scsi_cmd->serial_number); pc->scsi_cmd->result = DID_TIME_OUT << 16; } else if (errors >= ERROR_MAX) { pc->scsi_cmd->result = DID_ERROR << 16; if (log) printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number); } else if (errors) { if (log) printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number); if (!idescsi_check_condition(drive, rq)) /* we started a request sense, so we'll be back, exit for now */ return 0; pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16); } else { pc->scsi_cmd->result = DID_OK << 16; } host = pc->scsi_cmd->device->host; spin_lock_irqsave(host->host_lock, flags); pc->done(pc->scsi_cmd); spin_unlock_irqrestore(host->host_lock, flags); kfree(pc); kfree(rq); scsi->pc = NULL; return 0; } static inline unsigned long get_timeout(idescsi_pc_t *pc) { return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies); } static int idescsi_expiry(ide_drive_t *drive) { idescsi_scsi_t *scsi = drive_to_idescsi(drive); idescsi_pc_t *pc = scsi->pc; #if IDESCSI_DEBUG_LOG printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies); #endif set_bit(PC_TIMEDOUT, &pc->flags); return 0; /* we do not want the ide subsystem to retry */ } /* * Our interrupt handler. */ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive) { idescsi_scsi_t *scsi = drive_to_idescsi(drive); ide_hwif_t *hwif = drive->hwif; idescsi_pc_t *pc = scsi->pc; struct request *rq = pc->rq; unsigned int temp; u16 bcount; u8 stat, ireason; #if IDESCSI_DEBUG_LOG printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n"); #endif /* IDESCSI_DEBUG_LOG */ if (test_bit(PC_TIMEDOUT, &pc->flags)){ #if IDESCSI_DEBUG_LOG printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies); #endif /* end this request now - scsi should retry it*/ idescsi_end_request (drive, 1, 0); return ide_stopped; } if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { #if IDESCSI_DEBUG_LOG printk ("ide-scsi: %s: DMA complete\n", drive->name); #endif /* IDESCSI_DEBUG_LOG */ pc->actually_transferred=pc->request_transfer; (void) HWIF(drive)->ide_dma_end(drive); } /* Clear the interrupt */ stat = drive->hwif->INB(IDE_STATUS_REG); if ((stat & DRQ_STAT) == 0) { /* No more interrupts */ if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred); local_irq_enable_in_hardirq(); if (stat & ERR_STAT) rq->errors++; idescsi_end_request (drive, 1, 0); return ide_stopped; } bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | hwif->INB(IDE_BCOUNTL_REG); ireason = hwif->INB(IDE_IREASON_REG); if (ireason & CD) { printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n"); return ide_do_reset (drive); } if (ireason & IO) { temp = pc->actually_transferred + bcount; if (temp > pc->request_transfer) { if (temp > pc->buffer_size) { printk(KERN_ERR "ide-scsi: The scsi wants to " "send us more data than expected " "- discarding data\n"); temp = pc->buffer_size - pc->actually_transferred; if (temp) { clear_bit(PC_WRITING, &pc->flags); if (pc->sg) idescsi_input_buffers(drive, pc, temp); else drive->hwif->atapi_input_bytes(drive, pc->current_position, temp); printk(KERN_ERR "ide-scsi: transferred" " %d of %d bytes\n", temp, bcount); } pc->actually_transferred += temp; pc->current_position += temp; idescsi_discard_data(drive, bcount - temp); ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); return ide_started; } #if IDESCSI_DEBUG_LOG printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n"); #endif /* IDESCSI_DEBUG_LOG */ } } if (ireason & IO) { clear_bit(PC_WRITING, &pc->flags); if (pc->sg) idescsi_input_buffers(drive, pc, bcount); else hwif->atapi_input_bytes(drive, pc->current_position, bcount); } else { set_bit(PC_WRITING, &pc->flags); if (pc->sg) idescsi_output_buffers(drive, pc, bcount); else hwif->atapi_output_bytes(drive, pc->current_position, bcount); } /* Update the current position */ pc->actually_transferred += bcount; pc->current_position += bcount; /* And set the interrupt handler again */ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); return ide_started; } static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; idescsi_scsi_t *scsi = drive_to_idescsi(drive); idescsi_pc_t *pc = scsi->pc; ide_startstop_t startstop; u8 ireason; if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { printk(KERN_ERR "ide-scsi: Strange, packet command " "initiated yet DRQ isn't asserted\n"); return startstop; } ireason = hwif->INB(IDE_IREASON_REG); if ((ireason & CD) == 0 || (ireason & IO)) { printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while " "issuing a packet command\n"); return ide_do_reset (drive); } BUG_ON(HWGROUP(drive)->handler != NULL); /* Set the interrupt routine */ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry); /* Send the actual packet */ drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12); if (test_bit (PC_DMA_OK, &pc->flags)) { set_bit (PC_DMA_IN_PROGRESS, &pc->flags); hwif->dma_start(drive); } return ide_started; } static inline int idescsi_set_direction(idescsi_pc_t *pc) { switch (pc->c[0]) { case READ_6: case READ_10: case READ_12: clear_bit(PC_WRITING, &pc->flags); return 0; case WRITE_6: case WRITE_10: case WRITE_12: set_bit(PC_WRITING, &pc->flags); return 0; default: return 1; } } static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc) { ide_hwif_t *hwif = drive->hwif; struct scatterlist *sg, *scsi_sg; int segments; if (!pc->request_transfer || pc->request_transfer % 1024) return 1; if (idescsi_set_direction(pc)) return 1; sg = hwif->sg_table; scsi_sg = scsi_sglist(pc->scsi_cmd); segments = scsi_sg_count(pc->scsi_cmd); if (segments > hwif->sg_max_nents) return 1; hwif->sg_nents = segments; memcpy(sg, scsi_sg, sizeof(*sg) * segments); return 0; } /* * Issue a packet command */ static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc) { idescsi_scsi_t *scsi = drive_to_idescsi(drive); ide_hwif_t *hwif = drive->hwif; u16 bcount; u8 dma = 0; scsi->pc=pc; /* Set the current packet command */ pc->actually_transferred=0; /* We haven't transferred any data yet */ pc->current_position=pc->buffer; /* Request to transfer the entire buffer at once */ bcount = min(pc->request_transfer, 63 * 1024); if (drive->using_dma && !idescsi_map_sg(drive, pc)) { hwif->sg_mapped = 1; dma = !hwif->dma_setup(drive); hwif->sg_mapped = 0; } SELECT_DRIVE(drive); ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma); if (dma) set_bit(PC_DMA_OK, &pc->flags); if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) { BUG_ON(HWGROUP(drive)->handler != NULL); ide_set_handler(drive, &idescsi_transfer_pc, get_timeout(pc), idescsi_expiry); /* Issue the packet command */ HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); return ide_started; } else { /* Issue the packet command */ HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); return idescsi_transfer_pc(drive); } } /* * idescsi_do_request is our request handling function. */ static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block) { #if IDESCSI_DEBUG_LOG printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors); printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); #endif /* IDESCSI_DEBUG_LOG */ if (blk_sense_request(rq) || blk_special_request(rq)) { return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special); } blk_dump_rq_flags(rq, "ide-scsi: unsup command"); idescsi_end_request (drive, 0, 0); return ide_stopped; } #ifdef CONFIG_IDE_PROC_FS static void idescsi_add_settings(ide_drive_t *drive) { idescsi_scsi_t *scsi = drive_to_idescsi(drive); /* * drive setting name read/write data type min max mul_factor div_factor data pointer set function */ ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL); ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL); ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL); ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL); ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL); } #else static inline void idescsi_add_settings(ide_drive_t *drive) { ; } #endif /* * Driver initialization. */ static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi) { if (drive->id && (drive->id->config & 0x0060) == 0x20) set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags); clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); #if IDESCSI_DEBUG_LOG set_bit(IDESCSI_LOG_CMD, &scsi->log); #endif /* IDESCSI_DEBUG_LOG */ idescsi_add_settings(drive); } static void ide_scsi_remove(ide_drive_t *drive) { struct Scsi_Host *scsihost = drive->driver_data; struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost); struct gendisk *g = scsi->disk; scsi_remove_host(scsihost); ide_proc_unregister_driver(drive, scsi->driver); ide_unregister_region(g); drive->driver_data = NULL; g->private_data = NULL; put_disk(g); ide_scsi_put(scsi); } static int ide_scsi_probe(ide_drive_t *); #ifdef CONFIG_IDE_PROC_FS static ide_proc_entry_t idescsi_proc[] = { { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, { NULL, 0, NULL, NULL } }; #endif static ide_driver_t idescsi_driver = { .gen_driver = { .owner = THIS_MODULE, .name = "ide-scsi", .bus = &ide_bus_type, }, .probe = ide_scsi_probe, .remove = ide_scsi_remove, .version = IDESCSI_VERSION, .media = ide_scsi, .supports_dsc_overlap = 0, .do_request = idescsi_do_request, .end_request = idescsi_end_request, .error = idescsi_atapi_error, .abort = idescsi_atapi_abort, #ifdef CONFIG_IDE_PROC_FS .proc = idescsi_proc, #endif }; static int idescsi_ide_open(struct inode *inode, struct file *filp) { struct gendisk *disk = inode->i_bdev->bd_disk; struct ide_scsi_obj *scsi; if (!(scsi = ide_scsi_get(disk))) return -ENXIO; return 0; } static int idescsi_ide_release(struct inode *inode, struct file *filp) { struct gendisk *disk = inode->i_bdev->bd_disk; struct ide_scsi_obj *scsi = ide_scsi_g(disk); ide_scsi_put(scsi); return 0; } static int idescsi_ide_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { struct block_device *bdev = inode->i_bdev; struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk); return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg); } static struct block_device_operations idescsi_ops = { .owner = THIS_MODULE, .open = idescsi_ide_open, .release = idescsi_ide_release, .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; idescsi_pc_t *pc = NULL; if (!drive) { scmd_printk (KERN_ERR, cmd, "drive not present\n"); goto abort; } scsi = drive_to_idescsi(drive); pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC); rq = kmalloc (sizeof (struct request), 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; pc->rq = rq; memcpy (pc->c, cmd->cmnd, cmd->cmd_len); pc->buffer = NULL; pc->sg = scsi_sglist(cmd); pc->sg_cnt = scsi_sg_count(cmd); pc->b_count = 0; pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd); pc->scsi_cmd = cmd; pc->done = done; pc->timeout = jiffies + cmd->timeout_per_command; 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); } } ide_init_drive_cmd (rq); rq->special = (char *) pc; rq->cmd_type = REQ_TYPE_SPECIAL; spin_unlock_irq(host->host_lock); rq->rq_disk = scsi->disk; (void) ide_do_drive_cmd (drive, rq, ide_end); spin_lock_irq(host->host_lock); return 0; abort: kfree (pc); kfree (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; /* 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) */ if (!scsi->pc) { ret = SUCCESS; goto ide_unlock; } /* It's somewhere in flight. Does ide subsystem agree? */ if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy && elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) { /* * FIXME - not sure this condition can ever occur */ printk (KERN_ERR "ide-scsi: cmd aborted!\n"); if (blk_sense_request(scsi->pc->rq)) kfree(scsi->pc->buffer); kfree(scsi->pc->rq); kfree(scsi->pc); scsi->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; /* 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); if (!scsi->pc || (req = scsi->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(scsi->pc->buffer); kfree(scsi->pc); scsi->pc = NULL; kfree(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; 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->present || drive->media == ide_disk || !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t)))) return -ENODEV; g = alloc_disk(1 << PARTN_BITS); if (!g) goto out_host_put; ide_init_disk(g, drive); host->max_id = 1; #if IDESCSI_DEBUG_LOG if (drive->id->last_lun) printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun); #endif if ((drive->id->last_lun & 0x7) != 7) host->max_lun = (drive->id->last_lun & 0x7) + 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; ide_proc_register_driver(drive, &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: 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");