Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Bartlomiej Zolnierkiewicz | 1982 | 56.39% | 40 | 41.67% |
Borislav Petkov | 1041 | 29.62% | 26 | 27.08% |
Christoph Hellwig | 189 | 5.38% | 11 | 11.46% |
Tejun Heo | 134 | 3.81% | 8 | 8.33% |
Jens Axboe | 106 | 3.02% | 2 | 2.08% |
Sergei Shtylyov | 37 | 1.05% | 2 | 2.08% |
Hongxu Jia | 10 | 0.28% | 1 | 1.04% |
Herbert Xu | 7 | 0.20% | 1 | 1.04% |
Geert Uytterhoeven | 3 | 0.09% | 1 | 1.04% |
Paul Gortmaker | 3 | 0.09% | 1 | 1.04% |
Bart Van Assche | 1 | 0.03% | 1 | 1.04% |
Martin Olsson | 1 | 0.03% | 1 | 1.04% |
Thomas Gleixner | 1 | 0.03% | 1 | 1.04% |
Total | 3515 | 96 |
// SPDX-License-Identifier: GPL-2.0-only /* * 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, REQ_OP_DRV_IN, 0); ide_req(rq)->type = ATA_PRIV_MISC; ide_req(rq)->special = pc; if (buf && bufflen) { error = blk_rq_map_kern(drive->queue, rq, buf, bufflen, GFP_NOIO); if (error) goto put_req; } memcpy(scsi_req(rq)->cmd, pc->c, 12); if (drive->media == ide_tape) scsi_req(rq)->cmd[13] = REQ_IDETAPE_PC1; blk_execute_rq(drive->queue, disk, rq, 0); error = scsi_req(rq)->result ? -EIO : 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; struct scsi_request *req; 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 (ata_sense_request(rq) || drive->sense_rq_armed) return; sense_rq = drive->sense_rq; if (!sense_rq) { sense_rq = blk_mq_alloc_request(drive->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT); drive->sense_rq = sense_rq; } req = scsi_req(sense_rq); memset(sense, 0, sizeof(*sense)); scsi_req_init(req); 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); blk_mq_free_request(sense_rq); drive->sense_rq = NULL; return; } sense_rq->rq_disk = rq->rq_disk; sense_rq->cmd_flags = REQ_OP_DRV_IN; ide_req(sense_rq)->type = ATA_PRIV_SENSE; sense_rq->rq_flags |= RQF_PREEMPT; req->cmd[0] = GPCMD_REQUEST_SENSE; req->cmd[4] = cmd_len; if (drive->media == ide_tape) req->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) { ide_hwif_t *hwif = drive->hwif; struct request *sense_rq; unsigned long flags; spin_lock_irqsave(&hwif->lock, flags); /* deferred failure from ide_prep_sense() */ if (!drive->sense_rq_armed) { printk(KERN_WARNING PFX "%s: error queuing a sense request\n", drive->name); spin_unlock_irqrestore(&hwif->lock, flags); return -ENOMEM; } sense_rq = drive->sense_rq; ide_req(sense_rq)->special = special; drive->sense_rq_armed = false; drive->hwif->rq = NULL; ide_insert_request_head(drive, sense_rq); spin_unlock_irqrestore(&hwif->lock, flags); 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, scsi_req(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)) ide_complete_rq(drive, BLK_STS_IOERR, 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: scsi_req(rq)->cmd[0]: 0x%x\n", __func__, scsi_req(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 (scsi_req(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->rq_flags & RQF_QUIET)) printk(KERN_INFO PFX "cmd 0x%x timed out\n", scsi_req(rq)->cmd[0]); wait = 0; break; } return wait; } EXPORT_SYMBOL_GPL(ide_cd_expiry); int ide_cd_get_xferlen(struct request *rq) { switch (req_op(rq)) { default: return 32768; case REQ_OP_SCSI_IN: case REQ_OP_SCSI_OUT: return blk_rq_bytes(rq); case REQ_OP_DRV_IN: case REQ_OP_DRV_OUT: switch (ide_req(rq)->type) { case ATA_PRIV_PC: case ATA_PRIV_SENSE: 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) && ata_pc_request(rq)) rq->rq_flags |= RQF_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 scsi_req(rq)->resid_len = 0; debug_log("%s: DMA finished\n", drive->name); } /* No more interrupts */ if ((stat & ATA_DRQ) == 0) { int uptodate; blk_status_t 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) && scsi_req(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) scsi_req(pc->rq)->result++; if (scsi_req(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", scsi_req(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 (ata_misc_request(rq)) { scsi_req(rq)->result = 0; error = BLK_STS_OK; } else { if (blk_rq_is_passthrough(rq) && uptodate <= 0) { if (scsi_req(rq)->result == 0) scsi_req(rq)->result = -EIO; } error = uptodate ? BLK_STS_OK : BLK_STS_IOERR; } 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); ide_dma_off(drive); return ide_do_reset(drive); } /* Get the number of bytes to transfer on this interrupt. */ ide_read_bcount_and_ireason(drive, &bcount, &ireason); if (ide_check_ireason(drive, rq, bcount, ireason, write)) return ide_do_reset(drive); done = min_t(unsigned int, bcount, cmd->nleft); ide_pio_bytes(drive, cmd, write, done); /* Update transferred byte count */ scsi_req(rq)->resid_len -= done; bcount -= done; if (bcount) ide_pad_transfer(drive, write, bcount); debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n", scsi_req(rq)->cmd[0], done, bcount, scsi_req(rq)->resid_len); /* And set the interrupt handler again */ ide_set_handler(drive, ide_pc_intr, timeout); 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 *uninitialized_var(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);
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