/* * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) * Copyright (C) 1998-2002 Linux ATA Development * Andre Hedrick * Copyright (C) 2003 Red Hat * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz */ /* * Mostly written by Mark Lord * and Gadi Oxman * and Andre Hedrick * * This is the IDE/ATA disk driver, as evolved from hd.c and ide.c. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ide-disk.h" static const u8 ide_rw_cmds[] = { ATA_CMD_READ_MULTI, ATA_CMD_WRITE_MULTI, ATA_CMD_READ_MULTI_EXT, ATA_CMD_WRITE_MULTI_EXT, ATA_CMD_PIO_READ, ATA_CMD_PIO_WRITE, ATA_CMD_PIO_READ_EXT, ATA_CMD_PIO_WRITE_EXT, ATA_CMD_READ, ATA_CMD_WRITE, ATA_CMD_READ_EXT, ATA_CMD_WRITE_EXT, }; static const u8 ide_data_phases[] = { TASKFILE_MULTI_IN, TASKFILE_MULTI_OUT, TASKFILE_IN, TASKFILE_OUT, TASKFILE_IN_DMA, TASKFILE_OUT_DMA, }; static void ide_tf_set_cmd(ide_drive_t *drive, ide_task_t *task, u8 dma) { u8 index, lba48, write; lba48 = (task->tf_flags & IDE_TFLAG_LBA48) ? 2 : 0; write = (task->tf_flags & IDE_TFLAG_WRITE) ? 1 : 0; if (dma) index = 8; else index = drive->mult_count ? 0 : 4; task->tf.command = ide_rw_cmds[index + lba48 + write]; if (dma) index = 8; /* fixup index */ task->data_phase = ide_data_phases[index / 2 + write]; } /* * __ide_do_rw_disk() issues READ and WRITE commands to a disk, * using LBA if supported, or CHS otherwise, to address sectors. */ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block) { ide_hwif_t *hwif = drive->hwif; u16 nsectors = (u16)rq->nr_sectors; u8 lba48 = !!(drive->dev_flags & IDE_DFLAG_LBA48); u8 dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA); ide_task_t task; struct ide_taskfile *tf = &task.tf; ide_startstop_t rc; if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) { if (block + rq->nr_sectors > 1ULL << 28) dma = 0; else lba48 = 0; } if (!dma) { ide_init_sg_cmd(drive, rq); ide_map_sg(drive, rq); } memset(&task, 0, sizeof(task)); task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; if (drive->dev_flags & IDE_DFLAG_LBA) { if (lba48) { pr_debug("%s: LBA=0x%012llx\n", drive->name, (unsigned long long)block); tf->hob_nsect = (nsectors >> 8) & 0xff; tf->hob_lbal = (u8)(block >> 24); if (sizeof(block) != 4) { tf->hob_lbam = (u8)((u64)block >> 32); tf->hob_lbah = (u8)((u64)block >> 40); } tf->nsect = nsectors & 0xff; tf->lbal = (u8) block; tf->lbam = (u8)(block >> 8); tf->lbah = (u8)(block >> 16); task.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB); } else { tf->nsect = nsectors & 0xff; tf->lbal = block; tf->lbam = block >>= 8; tf->lbah = block >>= 8; tf->device = (block >> 8) & 0xf; } tf->device |= ATA_LBA; } else { unsigned int sect, head, cyl, track; track = (int)block / drive->sect; sect = (int)block % drive->sect + 1; head = track % drive->head; cyl = track / drive->head; pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect); tf->nsect = nsectors & 0xff; tf->lbal = sect; tf->lbam = cyl; tf->lbah = cyl >> 8; tf->device = head; } if (rq_data_dir(rq)) task.tf_flags |= IDE_TFLAG_WRITE; ide_tf_set_cmd(drive, &task, dma); if (!dma) hwif->data_phase = task.data_phase; task.rq = rq; rc = do_rw_taskfile(drive, &task); if (rc == ide_stopped && dma) { /* fallback to PIO */ task.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK; ide_tf_set_cmd(drive, &task, 0); hwif->data_phase = task.data_phase; ide_init_sg_cmd(drive, rq); rc = do_rw_taskfile(drive, &task); } return rc; } /* * 268435455 == 137439 MB or 28bit limit * 320173056 == 163929 MB or 48bit addressing * 1073741822 == 549756 MB or 48bit addressing fake drive */ static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block) { ide_hwif_t *hwif = drive->hwif; BUG_ON(drive->dev_flags & IDE_DFLAG_BLOCKED); if (!blk_fs_request(rq)) { blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command"); ide_end_request(drive, 0, 0); return ide_stopped; } ledtrig_ide_activity(); pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n", drive->name, rq_data_dir(rq) == READ ? "read" : "writ", (unsigned long long)block, rq->nr_sectors, (unsigned long)rq->buffer); if (hwif->rw_disk) hwif->rw_disk(drive, rq); return __ide_do_rw_disk(drive, rq, block); } /* * Queries for true maximum capacity of the drive. * Returns maximum LBA address (> 0) of the drive, 0 if failed. */ static u64 idedisk_read_native_max_address(ide_drive_t *drive, int lba48) { ide_task_t args; struct ide_taskfile *tf = &args.tf; u64 addr = 0; /* Create IDE/ATA command request structure */ memset(&args, 0, sizeof(ide_task_t)); if (lba48) tf->command = ATA_CMD_READ_NATIVE_MAX_EXT; else tf->command = ATA_CMD_READ_NATIVE_MAX; tf->device = ATA_LBA; args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; if (lba48) args.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB); /* submit command request */ ide_no_data_taskfile(drive, &args); /* if OK, compute maximum address value */ if ((tf->status & 0x01) == 0) addr = ide_get_lba_addr(tf, lba48) + 1; return addr; } /* * Sets maximum virtual LBA address of the drive. * Returns new maximum virtual LBA address (> 0) or 0 on failure. */ static u64 idedisk_set_max_address(ide_drive_t *drive, u64 addr_req, int lba48) { ide_task_t args; struct ide_taskfile *tf = &args.tf; u64 addr_set = 0; addr_req--; /* Create IDE/ATA command request structure */ memset(&args, 0, sizeof(ide_task_t)); tf->lbal = (addr_req >> 0) & 0xff; tf->lbam = (addr_req >>= 8) & 0xff; tf->lbah = (addr_req >>= 8) & 0xff; if (lba48) { tf->hob_lbal = (addr_req >>= 8) & 0xff; tf->hob_lbam = (addr_req >>= 8) & 0xff; tf->hob_lbah = (addr_req >>= 8) & 0xff; tf->command = ATA_CMD_SET_MAX_EXT; } else { tf->device = (addr_req >>= 8) & 0x0f; tf->command = ATA_CMD_SET_MAX; } tf->device |= ATA_LBA; args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; if (lba48) args.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB); /* submit command request */ ide_no_data_taskfile(drive, &args); /* if OK, compute maximum address value */ if ((tf->status & 0x01) == 0) addr_set = ide_get_lba_addr(tf, lba48) + 1; return addr_set; } static unsigned long long sectors_to_MB(unsigned long long n) { n <<= 9; /* make it bytes */ do_div(n, 1000000); /* make it MB */ return n; } /* * Some disks report total number of sectors instead of * maximum sector address. We list them here. */ static const struct drive_list_entry hpa_list[] = { { "ST340823A", NULL }, { "ST320413A", NULL }, { "ST310211A", NULL }, { NULL, NULL } }; static void idedisk_check_hpa(ide_drive_t *drive) { unsigned long long capacity, set_max; int lba48 = ata_id_lba48_enabled(drive->id); capacity = drive->capacity64; set_max = idedisk_read_native_max_address(drive, lba48); if (ide_in_drive_list(drive->id, hpa_list)) { /* * Since we are inclusive wrt to firmware revisions do this * extra check and apply the workaround only when needed. */ if (set_max == capacity + 1) set_max--; } if (set_max <= capacity) return; printk(KERN_INFO "%s: Host Protected Area detected.\n" "\tcurrent capacity is %llu sectors (%llu MB)\n" "\tnative capacity is %llu sectors (%llu MB)\n", drive->name, capacity, sectors_to_MB(capacity), set_max, sectors_to_MB(set_max)); set_max = idedisk_set_max_address(drive, set_max, lba48); if (set_max) { drive->capacity64 = set_max; printk(KERN_INFO "%s: Host Protected Area disabled.\n", drive->name); } } static int ide_disk_get_capacity(ide_drive_t *drive) { u16 *id = drive->id; int lba; if (ata_id_lba48_enabled(id)) { /* drive speaks 48-bit LBA */ lba = 1; drive->capacity64 = ata_id_u64(id, ATA_ID_LBA_CAPACITY_2); } else if (ata_id_has_lba(id) && ata_id_is_lba_capacity_ok(id)) { /* drive speaks 28-bit LBA */ lba = 1; drive->capacity64 = ata_id_u32(id, ATA_ID_LBA_CAPACITY); } else { /* drive speaks boring old 28-bit CHS */ lba = 0; drive->capacity64 = drive->cyl * drive->head * drive->sect; } if (lba) { drive->dev_flags |= IDE_DFLAG_LBA; /* * If this device supports the Host Protected Area feature set, * then we may need to change our opinion about its capacity. */ if (ata_id_hpa_enabled(id)) idedisk_check_hpa(drive); } /* limit drive capacity to 137GB if LBA48 cannot be used */ if ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 && drive->capacity64 > 1ULL << 28) { printk(KERN_WARNING "%s: cannot use LBA48 - full capacity " "%llu sectors (%llu MB)\n", drive->name, (unsigned long long)drive->capacity64, sectors_to_MB(drive->capacity64)); drive->capacity64 = 1ULL << 28; } if ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && (drive->dev_flags & IDE_DFLAG_LBA48)) { if (drive->capacity64 > 1ULL << 28) { printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode" " will be used for accessing sectors " "> %u\n", drive->name, 1 << 28); } else drive->dev_flags &= ~IDE_DFLAG_LBA48; } return 0; } static void idedisk_prepare_flush(struct request_queue *q, struct request *rq) { ide_drive_t *drive = q->queuedata; ide_task_t *task = kmalloc(sizeof(*task), GFP_ATOMIC); /* FIXME: map struct ide_taskfile on rq->cmd[] */ BUG_ON(task == NULL); memset(task, 0, sizeof(*task)); if (ata_id_flush_ext_enabled(drive->id) && (drive->capacity64 >= (1UL << 28))) task->tf.command = ATA_CMD_FLUSH_EXT; else task->tf.command = ATA_CMD_FLUSH; task->tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE | IDE_TFLAG_DYN; task->data_phase = TASKFILE_NO_DATA; rq->cmd_type = REQ_TYPE_ATA_TASKFILE; rq->cmd_flags |= REQ_SOFTBARRIER; rq->special = task; } ide_devset_get(multcount, mult_count); /* * This is tightly woven into the driver->do_special can not touch. * DON'T do it again until a total personality rewrite is committed. */ static int set_multcount(ide_drive_t *drive, int arg) { struct request *rq; int error; if (arg < 0 || arg > (drive->id[ATA_ID_MAX_MULTSECT] & 0xff)) return -EINVAL; if (drive->special.b.set_multmode) return -EBUSY; rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_ATA_TASKFILE; drive->mult_req = arg; drive->special.b.set_multmode = 1; error = blk_execute_rq(drive->queue, NULL, rq, 0); blk_put_request(rq); return (drive->mult_count == arg) ? 0 : -EIO; } ide_devset_get_flag(nowerr, IDE_DFLAG_NOWERR); static int set_nowerr(ide_drive_t *drive, int arg) { if (arg < 0 || arg > 1) return -EINVAL; if (arg) drive->dev_flags |= IDE_DFLAG_NOWERR; else drive->dev_flags &= ~IDE_DFLAG_NOWERR; drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT; return 0; } static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect) { ide_task_t task; memset(&task, 0, sizeof(task)); task.tf.feature = feature; task.tf.nsect = nsect; task.tf.command = ATA_CMD_SET_FEATURES; task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; return ide_no_data_taskfile(drive, &task); } static void update_ordered(ide_drive_t *drive) { u16 *id = drive->id; unsigned ordered = QUEUE_ORDERED_NONE; prepare_flush_fn *prep_fn = NULL; if (drive->dev_flags & IDE_DFLAG_WCACHE) { unsigned long long capacity; int barrier; /* * We must avoid issuing commands a drive does not * understand or we may crash it. We check flush cache * is supported. We also check we have the LBA48 flush * cache if the drive capacity is too large. By this * time we have trimmed the drive capacity if LBA48 is * not available so we don't need to recheck that. */ capacity = ide_gd_capacity(drive); barrier = ata_id_flush_enabled(id) && (drive->dev_flags & IDE_DFLAG_NOFLUSH) == 0 && ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 || capacity <= (1ULL << 28) || ata_id_flush_ext_enabled(id)); printk(KERN_INFO "%s: cache flushes %ssupported\n", drive->name, barrier ? "" : "not "); if (barrier) { ordered = QUEUE_ORDERED_DRAIN_FLUSH; prep_fn = idedisk_prepare_flush; } } else ordered = QUEUE_ORDERED_DRAIN; blk_queue_ordered(drive->queue, ordered, prep_fn); } ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE); static int set_wcache(ide_drive_t *drive, int arg) { int err = 1; if (arg < 0 || arg > 1) return -EINVAL; if (ata_id_flush_enabled(drive->id)) { err = ide_do_setfeature(drive, arg ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF, 0); if (err == 0) { if (arg) drive->dev_flags |= IDE_DFLAG_WCACHE; else drive->dev_flags &= ~IDE_DFLAG_WCACHE; } } update_ordered(drive); return err; } static int do_idedisk_flushcache(ide_drive_t *drive) { ide_task_t args; memset(&args, 0, sizeof(ide_task_t)); if (ata_id_flush_ext_enabled(drive->id)) args.tf.command = ATA_CMD_FLUSH_EXT; else args.tf.command = ATA_CMD_FLUSH; args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; return ide_no_data_taskfile(drive, &args); } ide_devset_get(acoustic, acoustic); static int set_acoustic(ide_drive_t *drive, int arg) { if (arg < 0 || arg > 254) return -EINVAL; ide_do_setfeature(drive, arg ? SETFEATURES_AAM_ON : SETFEATURES_AAM_OFF, arg); drive->acoustic = arg; return 0; } ide_devset_get_flag(addressing, IDE_DFLAG_LBA48); /* * drive->addressing: * 0: 28-bit * 1: 48-bit * 2: 48-bit capable doing 28-bit */ static int set_addressing(ide_drive_t *drive, int arg) { if (arg < 0 || arg > 2) return -EINVAL; if (arg && ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48) || ata_id_lba48_enabled(drive->id) == 0)) return -EIO; if (arg == 2) arg = 0; if (arg) drive->dev_flags |= IDE_DFLAG_LBA48; else drive->dev_flags &= ~IDE_DFLAG_LBA48; return 0; } ide_ext_devset_rw(acoustic, acoustic); ide_ext_devset_rw(address, addressing); ide_ext_devset_rw(multcount, multcount); ide_ext_devset_rw(wcache, wcache); ide_ext_devset_rw_sync(nowerr, nowerr); static int ide_disk_check(ide_drive_t *drive, const char *s) { return 1; } static void ide_disk_setup(ide_drive_t *drive) { struct ide_disk_obj *idkp = drive->driver_data; struct request_queue *q = drive->queue; ide_hwif_t *hwif = drive->hwif; u16 *id = drive->id; char *m = (char *)&id[ATA_ID_PROD]; unsigned long long capacity; ide_proc_register_driver(drive, idkp->driver); if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) return; if (drive->dev_flags & IDE_DFLAG_REMOVABLE) { /* * Removable disks (eg. SYQUEST); ignore 'WD' drives */ if (m[0] != 'W' || m[1] != 'D') drive->dev_flags |= IDE_DFLAG_DOORLOCKING; } (void)set_addressing(drive, 1); if (drive->dev_flags & IDE_DFLAG_LBA48) { int max_s = 2048; if (max_s > hwif->rqsize) max_s = hwif->rqsize; blk_queue_max_sectors(q, max_s); } printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name, q->max_sectors / 2); if (ata_id_is_ssd(id)) queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); /* calculate drive capacity, and select LBA if possible */ ide_disk_get_capacity(drive); /* * if possible, give fdisk access to more of the drive, * by correcting bios_cyls: */ capacity = ide_gd_capacity(drive); if ((drive->dev_flags & IDE_DFLAG_FORCED_GEOM) == 0) { if (ata_id_lba48_enabled(drive->id)) { /* compatibility */ drive->bios_sect = 63; drive->bios_head = 255; } if (drive->bios_sect && drive->bios_head) { unsigned int cap0 = capacity; /* truncate to 32 bits */ unsigned int cylsz, cyl; if (cap0 != capacity) drive->bios_cyl = 65535; else { cylsz = drive->bios_sect * drive->bios_head; cyl = cap0 / cylsz; if (cyl > 65535) cyl = 65535; if (cyl > drive->bios_cyl) drive->bios_cyl = cyl; } } } printk(KERN_INFO "%s: %llu sectors (%llu MB)", drive->name, capacity, sectors_to_MB(capacity)); /* Only print cache size when it was specified */ if (id[ATA_ID_BUF_SIZE]) printk(KERN_CONT " w/%dKiB Cache", id[ATA_ID_BUF_SIZE] / 2); printk(KERN_CONT ", CHS=%d/%d/%d\n", drive->bios_cyl, drive->bios_head, drive->bios_sect); /* write cache enabled? */ if ((id[ATA_ID_CSFO] & 1) || ata_id_wcache_enabled(id)) drive->dev_flags |= IDE_DFLAG_WCACHE; set_wcache(drive, 1); if ((drive->dev_flags & IDE_DFLAG_LBA) == 0 && (drive->head == 0 || drive->head > 16)) { printk(KERN_ERR "%s: invalid geometry: %d physical heads?\n", drive->name, drive->head); drive->dev_flags &= ~IDE_DFLAG_ATTACH; } else drive->dev_flags |= IDE_DFLAG_ATTACH; } static void ide_disk_flush(ide_drive_t *drive) { if (ata_id_flush_enabled(drive->id) == 0 || (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) return; if (do_idedisk_flushcache(drive)) printk(KERN_INFO "%s: wcache flush failed!\n", drive->name); } static int ide_disk_init_media(ide_drive_t *drive, struct gendisk *disk) { return 0; } static int ide_disk_set_doorlock(ide_drive_t *drive, struct gendisk *disk, int on) { ide_task_t task; int ret; if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) return 0; memset(&task, 0, sizeof(task)); task.tf.command = on ? ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK; task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; ret = ide_no_data_taskfile(drive, &task); if (ret) drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; return ret; } #ifdef DDE_LINUX int ide_disk_ioctl(ide_drive_t *drive, struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { return 0; } #endif const struct ide_disk_ops ide_ata_disk_ops = { .check = ide_disk_check, .get_capacity = ide_disk_get_capacity, .setup = ide_disk_setup, .flush = ide_disk_flush, .init_media = ide_disk_init_media, .set_doorlock = ide_disk_set_doorlock, .do_request = ide_do_rw_disk, .end_request = ide_end_request, .ioctl = ide_disk_ioctl, };