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756 lines
18 KiB
756 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ATAPI support. |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/cdrom.h> |
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#include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/ide.h> |
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#include <linux/scatterlist.h> |
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#include <linux/gfp.h> |
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#include <scsi/scsi.h> |
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#define DRV_NAME "ide-atapi" |
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#define PFX DRV_NAME ": " |
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#ifdef DEBUG |
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#define debug_log(fmt, args...) \ |
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printk(KERN_INFO "ide: " 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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#define ATAPI_MIN_CDB_BYTES 12 |
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static inline int dev_is_idecd(ide_drive_t *drive) |
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{ |
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return drive->media == ide_cdrom || drive->media == ide_optical; |
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} |
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/* |
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* Check whether we can support a device, |
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* based on the ATAPI IDENTIFY command results. |
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*/ |
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int ide_check_atapi_device(ide_drive_t *drive, const char *s) |
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{ |
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u16 *id = drive->id; |
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u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; |
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*((u16 *)&gcw) = id[ATA_ID_CONFIG]; |
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protocol = (gcw[1] & 0xC0) >> 6; |
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device_type = gcw[1] & 0x1F; |
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removable = (gcw[0] & 0x80) >> 7; |
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drq_type = (gcw[0] & 0x60) >> 5; |
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packet_size = gcw[0] & 0x03; |
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#ifdef CONFIG_PPC |
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/* kludge for Apple PowerBook internal zip */ |
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if (drive->media == ide_floppy && device_type == 5 && |
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!strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && |
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strstr((char *)&id[ATA_ID_PROD], "ZIP")) |
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device_type = 0; |
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#endif |
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if (protocol != 2) |
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printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", |
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s, drive->name, protocol); |
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else if ((drive->media == ide_floppy && device_type != 0) || |
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(drive->media == ide_tape && device_type != 1)) |
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printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", |
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s, drive->name, device_type); |
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else if (removable == 0) |
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printk(KERN_ERR "%s: %s: the removable flag is not set\n", |
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s, drive->name); |
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else if (drive->media == ide_floppy && drq_type == 3) |
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printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " |
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"supported\n", s, drive->name, drq_type); |
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else if (packet_size != 0) |
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printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " |
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"bytes\n", s, drive->name, packet_size); |
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else |
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return 1; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ide_check_atapi_device); |
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void ide_init_pc(struct ide_atapi_pc *pc) |
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{ |
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memset(pc, 0, sizeof(*pc)); |
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} |
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EXPORT_SYMBOL_GPL(ide_init_pc); |
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/* |
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* Add a special packet command request to the tail of the request queue, |
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* and wait for it to be serviced. |
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*/ |
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int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk, |
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struct ide_atapi_pc *pc, void *buf, unsigned int bufflen) |
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{ |
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struct request *rq; |
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int error; |
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rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0); |
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ide_req(rq)->type = ATA_PRIV_MISC; |
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ide_req(rq)->special = pc; |
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if (buf && bufflen) { |
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error = blk_rq_map_kern(drive->queue, rq, buf, bufflen, |
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GFP_NOIO); |
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if (error) |
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goto put_req; |
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} |
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memcpy(scsi_req(rq)->cmd, pc->c, 12); |
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if (drive->media == ide_tape) |
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scsi_req(rq)->cmd[13] = REQ_IDETAPE_PC1; |
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blk_execute_rq(disk, rq, 0); |
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error = scsi_req(rq)->result ? -EIO : 0; |
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put_req: |
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blk_put_request(rq); |
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return error; |
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} |
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EXPORT_SYMBOL_GPL(ide_queue_pc_tail); |
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int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk) |
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{ |
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struct ide_atapi_pc pc; |
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ide_init_pc(&pc); |
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pc.c[0] = TEST_UNIT_READY; |
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return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
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} |
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EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); |
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int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start) |
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{ |
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struct ide_atapi_pc pc; |
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ide_init_pc(&pc); |
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pc.c[0] = START_STOP; |
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pc.c[4] = start; |
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if (drive->media == ide_tape) |
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pc.flags |= PC_FLAG_WAIT_FOR_DSC; |
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return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
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} |
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EXPORT_SYMBOL_GPL(ide_do_start_stop); |
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int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on) |
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{ |
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struct ide_atapi_pc pc; |
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if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) |
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return 0; |
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ide_init_pc(&pc); |
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pc.c[0] = ALLOW_MEDIUM_REMOVAL; |
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pc.c[4] = on; |
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return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
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} |
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EXPORT_SYMBOL_GPL(ide_set_media_lock); |
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void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc) |
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{ |
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ide_init_pc(pc); |
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pc->c[0] = REQUEST_SENSE; |
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if (drive->media == ide_floppy) { |
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pc->c[4] = 255; |
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pc->req_xfer = 18; |
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} else { |
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pc->c[4] = 20; |
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pc->req_xfer = 20; |
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} |
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} |
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EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd); |
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void ide_prep_sense(ide_drive_t *drive, struct request *rq) |
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{ |
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struct request_sense *sense = &drive->sense_data; |
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struct request *sense_rq; |
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struct scsi_request *req; |
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unsigned int cmd_len, sense_len; |
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int err; |
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switch (drive->media) { |
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case ide_floppy: |
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cmd_len = 255; |
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sense_len = 18; |
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break; |
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case ide_tape: |
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cmd_len = 20; |
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sense_len = 20; |
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break; |
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default: |
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cmd_len = 18; |
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sense_len = 18; |
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} |
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BUG_ON(sense_len > sizeof(*sense)); |
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if (ata_sense_request(rq) || drive->sense_rq_armed) |
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return; |
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sense_rq = drive->sense_rq; |
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if (!sense_rq) { |
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sense_rq = blk_mq_alloc_request(drive->queue, REQ_OP_DRV_IN, |
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BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); |
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drive->sense_rq = sense_rq; |
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} |
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req = scsi_req(sense_rq); |
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memset(sense, 0, sizeof(*sense)); |
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scsi_req_init(req); |
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err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len, |
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GFP_NOIO); |
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if (unlikely(err)) { |
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if (printk_ratelimit()) |
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printk(KERN_WARNING PFX "%s: failed to map sense " |
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"buffer\n", drive->name); |
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blk_mq_free_request(sense_rq); |
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drive->sense_rq = NULL; |
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return; |
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} |
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sense_rq->rq_disk = rq->rq_disk; |
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sense_rq->cmd_flags = REQ_OP_DRV_IN; |
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ide_req(sense_rq)->type = ATA_PRIV_SENSE; |
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req->cmd[0] = GPCMD_REQUEST_SENSE; |
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req->cmd[4] = cmd_len; |
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if (drive->media == ide_tape) |
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req->cmd[13] = REQ_IDETAPE_PC1; |
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drive->sense_rq_armed = true; |
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} |
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EXPORT_SYMBOL_GPL(ide_prep_sense); |
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int ide_queue_sense_rq(ide_drive_t *drive, void *special) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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struct request *sense_rq; |
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unsigned long flags; |
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spin_lock_irqsave(&hwif->lock, flags); |
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/* deferred failure from ide_prep_sense() */ |
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if (!drive->sense_rq_armed) { |
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printk(KERN_WARNING PFX "%s: error queuing a sense request\n", |
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drive->name); |
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spin_unlock_irqrestore(&hwif->lock, flags); |
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return -ENOMEM; |
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} |
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sense_rq = drive->sense_rq; |
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ide_req(sense_rq)->special = special; |
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drive->sense_rq_armed = false; |
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drive->hwif->rq = NULL; |
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ide_insert_request_head(drive, sense_rq); |
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spin_unlock_irqrestore(&hwif->lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ide_queue_sense_rq); |
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/* |
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* Called when an error was detected during the last packet command. |
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* We queue a request sense packet command at the head of the request |
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* queue. |
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*/ |
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void ide_retry_pc(ide_drive_t *drive) |
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{ |
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struct request *failed_rq = drive->hwif->rq; |
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struct request *sense_rq = drive->sense_rq; |
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struct ide_atapi_pc *pc = &drive->request_sense_pc; |
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(void)ide_read_error(drive); |
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/* init pc from sense_rq */ |
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ide_init_pc(pc); |
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memcpy(pc->c, scsi_req(sense_rq)->cmd, 12); |
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if (drive->media == ide_tape) |
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drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
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/* |
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* Push back the failed request and put request sense on top |
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* of it. The failed command will be retried after sense data |
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* is acquired. |
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*/ |
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drive->hwif->rq = NULL; |
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ide_requeue_and_plug(drive, failed_rq); |
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if (ide_queue_sense_rq(drive, pc)) |
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ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(failed_rq)); |
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} |
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EXPORT_SYMBOL_GPL(ide_retry_pc); |
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int ide_cd_expiry(ide_drive_t *drive) |
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{ |
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struct request *rq = drive->hwif->rq; |
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unsigned long wait = 0; |
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debug_log("%s: scsi_req(rq)->cmd[0]: 0x%x\n", __func__, scsi_req(rq)->cmd[0]); |
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/* |
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* Some commands are *slow* and normally take a long time to complete. |
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* Usually we can use the ATAPI "disconnect" to bypass this, but not all |
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* commands/drives support that. Let ide_timer_expiry keep polling us |
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* for these. |
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*/ |
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switch (scsi_req(rq)->cmd[0]) { |
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case GPCMD_BLANK: |
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case GPCMD_FORMAT_UNIT: |
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case GPCMD_RESERVE_RZONE_TRACK: |
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case GPCMD_CLOSE_TRACK: |
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case GPCMD_FLUSH_CACHE: |
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wait = ATAPI_WAIT_PC; |
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break; |
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default: |
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if (!(rq->rq_flags & RQF_QUIET)) |
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printk(KERN_INFO PFX "cmd 0x%x timed out\n", |
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scsi_req(rq)->cmd[0]); |
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wait = 0; |
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break; |
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} |
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return wait; |
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} |
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EXPORT_SYMBOL_GPL(ide_cd_expiry); |
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int ide_cd_get_xferlen(struct request *rq) |
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{ |
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switch (req_op(rq)) { |
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default: |
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return 32768; |
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case REQ_OP_SCSI_IN: |
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case REQ_OP_SCSI_OUT: |
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return blk_rq_bytes(rq); |
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case REQ_OP_DRV_IN: |
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case REQ_OP_DRV_OUT: |
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switch (ide_req(rq)->type) { |
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case ATA_PRIV_PC: |
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case ATA_PRIV_SENSE: |
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return blk_rq_bytes(rq); |
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default: |
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return 0; |
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} |
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} |
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} |
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EXPORT_SYMBOL_GPL(ide_cd_get_xferlen); |
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void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason) |
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{ |
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struct ide_taskfile tf; |
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drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT | |
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IDE_VALID_LBAM | IDE_VALID_LBAH); |
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*bcount = (tf.lbah << 8) | tf.lbam; |
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*ireason = tf.nsect & 3; |
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} |
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EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); |
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/* |
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* Check the contents of the interrupt reason register and attempt to recover if |
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* there are problems. |
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* |
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* Returns: |
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* - 0 if everything's ok |
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* - 1 if the request has to be terminated. |
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*/ |
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int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len, |
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int ireason, int rw) |
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{ |
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ide_hwif_t *hwif = drive->hwif; |
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debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw); |
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if (ireason == (!rw << 1)) |
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return 0; |
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else if (ireason == (rw << 1)) { |
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printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n", |
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drive->name, __func__); |
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if (dev_is_idecd(drive)) |
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ide_pad_transfer(drive, rw, len); |
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} else if (!rw && ireason == ATAPI_COD) { |
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if (dev_is_idecd(drive)) { |
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/* |
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* Some drives (ASUS) seem to tell us that status info |
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* is available. Just get it and ignore. |
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*/ |
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(void)hwif->tp_ops->read_status(hwif); |
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return 0; |
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} |
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} else { |
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if (ireason & ATAPI_COD) |
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printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name, |
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__func__); |
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/* drive wants a command packet, or invalid ireason... */ |
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printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n", |
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drive->name, __func__, ireason); |
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} |
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if (dev_is_idecd(drive) && ata_pc_request(rq)) |
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rq->rq_flags |= RQF_FAILED; |
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return 1; |
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} |
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EXPORT_SYMBOL_GPL(ide_check_ireason); |
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/* |
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* This is the usual interrupt handler which will be called during a packet |
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* command. We will transfer some of the data (as requested by the drive) |
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* and will re-point interrupt handler to us. |
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*/ |
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static ide_startstop_t ide_pc_intr(ide_drive_t *drive) |
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{ |
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struct ide_atapi_pc *pc = drive->pc; |
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ide_hwif_t *hwif = drive->hwif; |
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struct ide_cmd *cmd = &hwif->cmd; |
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struct request *rq = hwif->rq; |
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const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
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unsigned int timeout, done; |
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u16 bcount; |
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u8 stat, ireason, dsc = 0; |
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u8 write = !!(pc->flags & PC_FLAG_WRITING); |
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debug_log("Enter %s - interrupt handler\n", __func__); |
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timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD |
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: WAIT_TAPE_CMD; |
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/* Clear the interrupt */ |
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stat = tp_ops->read_status(hwif); |
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
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int rc; |
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drive->waiting_for_dma = 0; |
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rc = hwif->dma_ops->dma_end(drive); |
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ide_dma_unmap_sg(drive, cmd); |
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if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) { |
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if (drive->media == ide_floppy) |
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printk(KERN_ERR PFX "%s: DMA %s error\n", |
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drive->name, rq_data_dir(pc->rq) |
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? "write" : "read"); |
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pc->flags |= PC_FLAG_DMA_ERROR; |
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} else |
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scsi_req(rq)->resid_len = 0; |
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debug_log("%s: DMA finished\n", drive->name); |
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} |
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/* No more interrupts */ |
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if ((stat & ATA_DRQ) == 0) { |
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int uptodate; |
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blk_status_t error; |
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debug_log("Packet command completed, %d bytes transferred\n", |
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blk_rq_bytes(rq)); |
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
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local_irq_enable_in_hardirq(); |
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if (drive->media == ide_tape && |
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(stat & ATA_ERR) && scsi_req(rq)->cmd[0] == REQUEST_SENSE) |
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stat &= ~ATA_ERR; |
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if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
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/* Error detected */ |
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debug_log("%s: I/O error\n", drive->name); |
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if (drive->media != ide_tape) |
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scsi_req(pc->rq)->result++; |
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if (scsi_req(rq)->cmd[0] == REQUEST_SENSE) { |
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printk(KERN_ERR PFX "%s: I/O error in request " |
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"sense command\n", drive->name); |
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return ide_do_reset(drive); |
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} |
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debug_log("[cmd %x]: check condition\n", scsi_req(rq)->cmd[0]); |
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/* Retry operation */ |
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ide_retry_pc(drive); |
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|
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/* queued, but not started */ |
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return ide_stopped; |
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} |
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pc->error = 0; |
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if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0) |
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dsc = 1; |
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/* |
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* ->pc_callback() might change rq->data_len for |
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* residual count, cache total length. |
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*/ |
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done = blk_rq_bytes(rq); |
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|
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/* Command finished - Call the callback function */ |
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uptodate = drive->pc_callback(drive, dsc); |
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if (uptodate == 0) |
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drive->failed_pc = NULL; |
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if (ata_misc_request(rq)) { |
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scsi_req(rq)->result = 0; |
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error = BLK_STS_OK; |
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} else { |
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if (blk_rq_is_passthrough(rq) && uptodate <= 0) { |
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if (scsi_req(rq)->result == 0) |
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scsi_req(rq)->result = -EIO; |
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} |
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error = uptodate ? BLK_STS_OK : BLK_STS_IOERR; |
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} |
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ide_complete_rq(drive, error, blk_rq_bytes(rq)); |
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return ide_stopped; |
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} |
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
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printk(KERN_ERR PFX "%s: The device wants to issue more " |
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"interrupts in DMA mode\n", drive->name); |
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ide_dma_off(drive); |
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return ide_do_reset(drive); |
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} |
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|
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/* Get the number of bytes to transfer on this interrupt. */ |
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ide_read_bcount_and_ireason(drive, &bcount, &ireason); |
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|
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if (ide_check_ireason(drive, rq, bcount, ireason, write)) |
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return ide_do_reset(drive); |
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|
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done = min_t(unsigned int, bcount, cmd->nleft); |
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ide_pio_bytes(drive, cmd, write, done); |
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|
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/* Update transferred byte count */ |
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scsi_req(rq)->resid_len -= done; |
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|
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bcount -= done; |
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|
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if (bcount) |
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ide_pad_transfer(drive, write, bcount); |
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debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n", |
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scsi_req(rq)->cmd[0], done, bcount, scsi_req(rq)->resid_len); |
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|
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/* And set the interrupt handler again */ |
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ide_set_handler(drive, ide_pc_intr, timeout); |
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return ide_started; |
|
} |
|
|
|
static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf, |
|
u16 bcount, u8 dma) |
|
{ |
|
cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO; |
|
cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM | |
|
IDE_VALID_FEATURE | valid_tf; |
|
cmd->tf.command = ATA_CMD_PACKET; |
|
cmd->tf.feature = dma; /* Use PIO/DMA */ |
|
cmd->tf.lbam = bcount & 0xff; |
|
cmd->tf.lbah = (bcount >> 8) & 0xff; |
|
} |
|
|
|
static u8 ide_read_ireason(ide_drive_t *drive) |
|
{ |
|
struct ide_taskfile tf; |
|
|
|
drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT); |
|
|
|
return tf.nsect & 3; |
|
} |
|
|
|
static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) |
|
{ |
|
int retries = 100; |
|
|
|
while (retries-- && ((ireason & ATAPI_COD) == 0 || |
|
(ireason & ATAPI_IO))) { |
|
printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing " |
|
"a packet command, retrying\n", drive->name); |
|
udelay(100); |
|
ireason = ide_read_ireason(drive); |
|
if (retries == 0) { |
|
printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing" |
|
" a packet command, ignoring\n", |
|
drive->name); |
|
ireason |= ATAPI_COD; |
|
ireason &= ~ATAPI_IO; |
|
} |
|
} |
|
|
|
return ireason; |
|
} |
|
|
|
static int ide_delayed_transfer_pc(ide_drive_t *drive) |
|
{ |
|
/* Send the actual packet */ |
|
drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12); |
|
|
|
/* Timeout for the packet command */ |
|
return WAIT_FLOPPY_CMD; |
|
} |
|
|
|
static ide_startstop_t ide_transfer_pc(ide_drive_t *drive) |
|
{ |
|
struct ide_atapi_pc *pc; |
|
ide_hwif_t *hwif = drive->hwif; |
|
struct request *rq = hwif->rq; |
|
ide_expiry_t *expiry; |
|
unsigned int timeout; |
|
int cmd_len; |
|
ide_startstop_t startstop; |
|
u8 ireason; |
|
|
|
if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) { |
|
printk(KERN_ERR PFX "%s: Strange, packet command initiated yet " |
|
"DRQ isn't asserted\n", drive->name); |
|
return startstop; |
|
} |
|
|
|
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { |
|
if (drive->dma) |
|
drive->waiting_for_dma = 1; |
|
} |
|
|
|
if (dev_is_idecd(drive)) { |
|
/* ATAPI commands get padded out to 12 bytes minimum */ |
|
cmd_len = COMMAND_SIZE(scsi_req(rq)->cmd[0]); |
|
if (cmd_len < ATAPI_MIN_CDB_BYTES) |
|
cmd_len = ATAPI_MIN_CDB_BYTES; |
|
|
|
timeout = rq->timeout; |
|
expiry = ide_cd_expiry; |
|
} else { |
|
pc = drive->pc; |
|
|
|
cmd_len = ATAPI_MIN_CDB_BYTES; |
|
|
|
/* |
|
* If necessary schedule the packet transfer to occur 'timeout' |
|
* milliseconds later in ide_delayed_transfer_pc() after the |
|
* device says it's ready for a packet. |
|
*/ |
|
if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) { |
|
timeout = drive->pc_delay; |
|
expiry = &ide_delayed_transfer_pc; |
|
} else { |
|
timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD |
|
: WAIT_TAPE_CMD; |
|
expiry = NULL; |
|
} |
|
|
|
ireason = ide_read_ireason(drive); |
|
if (drive->media == ide_tape) |
|
ireason = ide_wait_ireason(drive, ireason); |
|
|
|
if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) { |
|
printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while " |
|
"issuing a packet command\n", drive->name); |
|
|
|
return ide_do_reset(drive); |
|
} |
|
} |
|
|
|
hwif->expiry = expiry; |
|
|
|
/* Set the interrupt routine */ |
|
ide_set_handler(drive, |
|
(dev_is_idecd(drive) ? drive->irq_handler |
|
: ide_pc_intr), |
|
timeout); |
|
|
|
/* Send the actual packet */ |
|
if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) |
|
hwif->tp_ops->output_data(drive, NULL, scsi_req(rq)->cmd, cmd_len); |
|
|
|
/* Begin DMA, if necessary */ |
|
if (dev_is_idecd(drive)) { |
|
if (drive->dma) |
|
hwif->dma_ops->dma_start(drive); |
|
} else { |
|
if (pc->flags & PC_FLAG_DMA_OK) { |
|
pc->flags |= PC_FLAG_DMA_IN_PROGRESS; |
|
hwif->dma_ops->dma_start(drive); |
|
} |
|
} |
|
|
|
return ide_started; |
|
} |
|
|
|
ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd) |
|
{ |
|
struct ide_atapi_pc *pc; |
|
ide_hwif_t *hwif = drive->hwif; |
|
ide_expiry_t *expiry = NULL; |
|
struct request *rq = hwif->rq; |
|
unsigned int timeout, bytes; |
|
u16 bcount; |
|
u8 valid_tf; |
|
u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT); |
|
|
|
if (dev_is_idecd(drive)) { |
|
valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL; |
|
bcount = ide_cd_get_xferlen(rq); |
|
expiry = ide_cd_expiry; |
|
timeout = ATAPI_WAIT_PC; |
|
|
|
if (drive->dma) |
|
drive->dma = !ide_dma_prepare(drive, cmd); |
|
} else { |
|
pc = drive->pc; |
|
|
|
valid_tf = IDE_VALID_DEVICE; |
|
bytes = blk_rq_bytes(rq); |
|
bcount = ((drive->media == ide_tape) ? bytes |
|
: min_t(unsigned int, |
|
bytes, 63 * 1024)); |
|
|
|
/* We haven't transferred any data yet */ |
|
scsi_req(rq)->resid_len = bcount; |
|
|
|
if (pc->flags & PC_FLAG_DMA_ERROR) { |
|
pc->flags &= ~PC_FLAG_DMA_ERROR; |
|
ide_dma_off(drive); |
|
} |
|
|
|
if (pc->flags & PC_FLAG_DMA_OK) |
|
drive->dma = !ide_dma_prepare(drive, cmd); |
|
|
|
if (!drive->dma) |
|
pc->flags &= ~PC_FLAG_DMA_OK; |
|
|
|
timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD |
|
: WAIT_TAPE_CMD; |
|
} |
|
|
|
ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma); |
|
|
|
(void)do_rw_taskfile(drive, cmd); |
|
|
|
if (drq_int) { |
|
if (drive->dma) |
|
drive->waiting_for_dma = 0; |
|
hwif->expiry = expiry; |
|
} |
|
|
|
ide_execute_command(drive, cmd, ide_transfer_pc, timeout); |
|
|
|
return drq_int ? ide_started : ide_transfer_pc(drive); |
|
} |
|
EXPORT_SYMBOL_GPL(ide_issue_pc);
|
|
|