/* * ATAPI support. */ #include <linux/kernel.h>#include <linux/cdrom.h>#include <linux/delay.h>#include <linux/export.h>#include <linux/ide.h>#include <linux/scatterlist.h>#include <linux/gfp.h> #include <scsi/scsi.h> #define DRV_NAME "ide-atapi"#define PFX DRV_NAME ": " #ifdef DEBUG#define debug_log(fmt, args...) \	printk(KERN_INFO "ide: " fmt, ## args)#else#define debug_log(fmt, args...) do {} while (0)#endif #define ATAPI_MIN_CDB_BYTES	12 static inline int dev_is_idecd(ide_drive_t *drive){	return drive->media == ide_cdrom || drive->media == ide_optical;} /* * Check whether we can support a device, * based on the ATAPI IDENTIFY command results. */int ide_check_atapi_device(ide_drive_t *drive, const char *s){	u16 *id = drive->id;	u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; 	*((u16 *)&gcw) = id[ATA_ID_CONFIG]; 	protocol    = (gcw[1] & 0xC0) >> 6;	device_type =  gcw[1] & 0x1F;	removable   = (gcw[0] & 0x80) >> 7;	drq_type    = (gcw[0] & 0x60) >> 5;	packet_size =  gcw[0] & 0x03; #ifdef CONFIG_PPC	/* kludge for Apple PowerBook internal zip */	if (drive->media == ide_floppy && device_type == 5 &&	    !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&	    strstr((char *)&id[ATA_ID_PROD], "ZIP"))		device_type = 0;#endif 	if (protocol != 2)		printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",			s, drive->name, protocol);	else if ((drive->media == ide_floppy && device_type != 0) ||		 (drive->media == ide_tape && device_type != 1))		printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",			s, drive->name, device_type);	else if (removable == 0)		printk(KERN_ERR "%s: %s: the removable flag is not set\n",			s, drive->name);	else if (drive->media == ide_floppy && drq_type == 3)		printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "			"supported\n", s, drive->name, drq_type);	else if (packet_size != 0)		printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "			"bytes\n", s, drive->name, packet_size);	else		return 1;	return 0;}EXPORT_SYMBOL_GPL(ide_check_atapi_device); void ide_init_pc(struct ide_atapi_pc *pc){	memset(pc, 0, sizeof(*pc));}EXPORT_SYMBOL_GPL(ide_init_pc); /* * Add a special packet command request to the tail of the request queue, * and wait for it to be serviced. */int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,		      struct ide_atapi_pc *pc, void *buf, unsigned int bufflen){	struct request *rq;	int error; 	rq = blk_get_request(drive->queue, READ, __GFP_WAIT);	rq->cmd_type = REQ_TYPE_SPECIAL;	rq->special = (char *)pc; 	if (buf && bufflen) {		error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,					GFP_NOIO);		if (error)			goto put_req;	} 	memcpy(rq->cmd, pc->c, 12);	if (drive->media == ide_tape)		rq->cmd[13] = REQ_IDETAPE_PC1;	error = blk_execute_rq(drive->queue, disk, rq, 0);put_req:	blk_put_request(rq);	return error;}EXPORT_SYMBOL_GPL(ide_queue_pc_tail); int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk){	struct ide_atapi_pc pc; 	ide_init_pc(&pc);	pc.c[0] = TEST_UNIT_READY; 	return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);}EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start){	struct ide_atapi_pc pc; 	ide_init_pc(&pc);	pc.c[0] = START_STOP;	pc.c[4] = start; 	if (drive->media == ide_tape)		pc.flags |= PC_FLAG_WAIT_FOR_DSC; 	return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);}EXPORT_SYMBOL_GPL(ide_do_start_stop); int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on){	struct ide_atapi_pc pc; 	if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)		return 0; 	ide_init_pc(&pc);	pc.c[0] = ALLOW_MEDIUM_REMOVAL;	pc.c[4] = on; 	return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);}EXPORT_SYMBOL_GPL(ide_set_media_lock); void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc){	ide_init_pc(pc);	pc->c[0] = REQUEST_SENSE;	if (drive->media == ide_floppy) {		pc->c[4] = 255;		pc->req_xfer = 18;	} else {		pc->c[4] = 20;		pc->req_xfer = 20;	}}EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd); void ide_prep_sense(ide_drive_t *drive, struct request *rq){	struct request_sense *sense = &drive->sense_data;	struct request *sense_rq = &drive->sense_rq;	unsigned int cmd_len, sense_len;	int err; 	switch (drive->media) {	case ide_floppy:		cmd_len = 255;		sense_len = 18;		break;	case ide_tape:		cmd_len = 20;		sense_len = 20;		break;	default:		cmd_len = 18;		sense_len = 18;	} 	BUG_ON(sense_len > sizeof(*sense)); 	if (rq->cmd_type == REQ_TYPE_SENSE || drive->sense_rq_armed)		return; 	memset(sense, 0, sizeof(*sense)); 	blk_rq_init(rq->q, sense_rq); 	err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,			      GFP_NOIO);	if (unlikely(err)) {		if (printk_ratelimit())			printk(KERN_WARNING PFX "%s: failed to map sense "					    "buffer\n", drive->name);		return;	} 	sense_rq->rq_disk = rq->rq_disk;	sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;	sense_rq->cmd[4] = cmd_len;	sense_rq->cmd_type = REQ_TYPE_SENSE;	sense_rq->cmd_flags |= REQ_PREEMPT; 	if (drive->media == ide_tape)		sense_rq->cmd[13] = REQ_IDETAPE_PC1; 	drive->sense_rq_armed = true;}EXPORT_SYMBOL_GPL(ide_prep_sense); int ide_queue_sense_rq(ide_drive_t *drive, void *special){	/* deferred failure from ide_prep_sense() */	if (!drive->sense_rq_armed) {		printk(KERN_WARNING PFX "%s: error queuing a sense request\n",		       drive->name);		return -ENOMEM;	} 	drive->sense_rq.special = special;	drive->sense_rq_armed = false; 	drive->hwif->rq = NULL; 	elv_add_request(drive->queue, &drive->sense_rq, ELEVATOR_INSERT_FRONT);	return 0;}EXPORT_SYMBOL_GPL(ide_queue_sense_rq); /* * Called when an error was detected during the last packet command. * We queue a request sense packet command at the head of the request * queue. */void ide_retry_pc(ide_drive_t *drive){	struct request *failed_rq = drive->hwif->rq;	struct request *sense_rq = &drive->sense_rq;	struct ide_atapi_pc *pc = &drive->request_sense_pc; 	(void)ide_read_error(drive); 	/* init pc from sense_rq */	ide_init_pc(pc);	memcpy(pc->c, sense_rq->cmd, 12); 	if (drive->media == ide_tape)		drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 	/*	 * Push back the failed request and put request sense on top	 * of it.  The failed command will be retried after sense data	 * is acquired.	 */	drive->hwif->rq = NULL;	ide_requeue_and_plug(drive, failed_rq);	if (ide_queue_sense_rq(drive, pc)) {		blk_start_request(failed_rq);		ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq));	}}EXPORT_SYMBOL_GPL(ide_retry_pc); int ide_cd_expiry(ide_drive_t *drive){	struct request *rq = drive->hwif->rq;	unsigned long wait = 0; 	debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]); 	/*	 * Some commands are *slow* and normally take a long time to complete.	 * Usually we can use the ATAPI "disconnect" to bypass this, but not all	 * commands/drives support that. Let ide_timer_expiry keep polling us	 * for these.	 */	switch (rq->cmd[0]) {	case GPCMD_BLANK:	case GPCMD_FORMAT_UNIT:	case GPCMD_RESERVE_RZONE_TRACK:	case GPCMD_CLOSE_TRACK:	case GPCMD_FLUSH_CACHE:		wait = ATAPI_WAIT_PC;		break;	default:		if (!(rq->cmd_flags & REQ_QUIET))			printk(KERN_INFO PFX "cmd 0x%x timed out\n",					 rq->cmd[0]);		wait = 0;		break;	}	return wait;}EXPORT_SYMBOL_GPL(ide_cd_expiry); int ide_cd_get_xferlen(struct request *rq){	switch (rq->cmd_type) {	case REQ_TYPE_FS:		return 32768;	case REQ_TYPE_SENSE:	case REQ_TYPE_BLOCK_PC:	case REQ_TYPE_ATA_PC:		return blk_rq_bytes(rq);	default:		return 0;	}}EXPORT_SYMBOL_GPL(ide_cd_get_xferlen); void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason){	struct ide_taskfile tf; 	drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |				     IDE_VALID_LBAM | IDE_VALID_LBAH); 	*bcount = (tf.lbah << 8) | tf.lbam;	*ireason = tf.nsect & 3;}EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); /* * Check the contents of the interrupt reason register and attempt to recover if * there are problems. * * Returns: * - 0 if everything's ok * - 1 if the request has to be terminated. */int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,		      int ireason, int rw){	ide_hwif_t *hwif = drive->hwif; 	debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw); 	if (ireason == (!rw << 1))		return 0;	else if (ireason == (rw << 1)) {		printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",				drive->name, __func__); 		if (dev_is_idecd(drive))			ide_pad_transfer(drive, rw, len);	} else if (!rw && ireason == ATAPI_COD) {		if (dev_is_idecd(drive)) {			/*			 * Some drives (ASUS) seem to tell us that status info			 * is available.  Just get it and ignore.			 */			(void)hwif->tp_ops->read_status(hwif);			return 0;		}	} else {		if (ireason & ATAPI_COD)			printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,					__func__); 		/* drive wants a command packet, or invalid ireason... */		printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",				drive->name, __func__, ireason);	} 	if (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)		rq->cmd_flags |= REQ_FAILED; 	return 1;}EXPORT_SYMBOL_GPL(ide_check_ireason); /* * This is the usual interrupt handler which will be called during a packet * command.  We will transfer some of the data (as requested by the drive) * and will re-point interrupt handler to us. */static ide_startstop_t ide_pc_intr(ide_drive_t *drive){	struct ide_atapi_pc *pc = drive->pc;	ide_hwif_t *hwif = drive->hwif;	struct ide_cmd *cmd = &hwif->cmd;	struct request *rq = hwif->rq;	const struct ide_tp_ops *tp_ops = hwif->tp_ops;	unsigned int timeout, done;	u16 bcount;	u8 stat, ireason, dsc = 0;	u8 write = !!(pc->flags & PC_FLAG_WRITING); 	debug_log("Enter %s - interrupt handler\n", __func__); 	timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD					       : WAIT_TAPE_CMD; 	/* Clear the interrupt */	stat = tp_ops->read_status(hwif); 	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {		int rc; 		drive->waiting_for_dma = 0;		rc = hwif->dma_ops->dma_end(drive);		ide_dma_unmap_sg(drive, cmd); 		if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {			if (drive->media == ide_floppy)				printk(KERN_ERR PFX "%s: DMA %s error\n",					drive->name, rq_data_dir(pc->rq)						     ? "write" : "read");			pc->flags |= PC_FLAG_DMA_ERROR;		} else			rq->resid_len = 0;		debug_log("%s: DMA finished\n", drive->name);	} 	/* No more interrupts */	if ((stat & ATA_DRQ) == 0) {		int uptodate, error; 		debug_log("Packet command completed, %d bytes transferred\n",			  blk_rq_bytes(rq)); 		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; 		local_irq_enable_in_hardirq(); 		if (drive->media == ide_tape &&		    (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)			stat &= ~ATA_ERR; 		if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {			/* Error detected */			debug_log("%s: I/O error\n", drive->name); 			if (drive->media != ide_tape)				pc->rq->errors++; 			if (rq->cmd[0] == REQUEST_SENSE) {				printk(KERN_ERR PFX "%s: I/O error in request "						"sense command\n", drive->name);				return ide_do_reset(drive);			} 			debug_log("[cmd %x]: check condition\n", rq->cmd[0]); 			/* Retry operation */			ide_retry_pc(drive); 			/* queued, but not started */			return ide_stopped;		}		pc->error = 0; 		if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)			dsc = 1; 		/*		 * ->pc_callback() might change rq->data_len for		 * residual count, cache total length.		 */		done = blk_rq_bytes(rq); 		/* Command finished - Call the callback function */		uptodate = drive->pc_callback(drive, dsc); 		if (uptodate == 0)			drive->failed_pc = NULL; 		if (rq->cmd_type == REQ_TYPE_SPECIAL) {			rq->errors = 0;			error = 0;		} else { 			if (rq->cmd_type != REQ_TYPE_FS && uptodate <= 0) {				if (rq->errors == 0)					rq->errors = -EIO;			} 			error = uptodate ? 0 : -EIO;		} 		ide_complete_rq(drive, error, blk_rq_bytes(rq));		return ide_stopped;	} 	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;		printk(KERN_ERR PFX "%s: The device wants to issue more "				"interrupts in DMA mode\n", drive->name);

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