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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [scsi/] [ide-scsi.c] - Rev 1765
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/* * linux/drivers/scsi/ide-scsi.c Version 0.93 June 10, 2002 * * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il> * Copyright (C) 2001 - 2002 Andre Hedrick <andre@linux-ide.org> */ /* * 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 Jan 06 02 Added 'ignore' parameter when ide-scsi is a module * so that use of scsi emulation can be made independent * of load order when other IDE drivers are modules. * Chris Ebenezer <chriseb@pobox.com> * Ver 0.92 Mar 21 02 Include DevFs support * Borsenkow Andrej <Andrej.Borsenkow@mow.siemens.ru> * Ver 0.93 Jun 10 02 Fix "off by one" error in transforms */ #define IDESCSI_VERSION "0.93" #include <linux/module.h> #include <linux/config.h> #include <linux/types.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/ioport.h> #include <linux/blkdev.h> #include <linux/errno.h> #include <linux/hdreg.h> #include <linux/slab.h> #include <linux/ide.h> #include <asm/io.h> #include <asm/bitops.h> #include <asm/uaccess.h> #include "scsi.h" #include "hosts.h" #include "sd.h" #include "ide-scsi.h" #include <scsi/sg.h> #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 */ int b_count; /* Bytes transferred from current entry */ Scsi_Cmnd *scsi_cmd; /* SCSI command */ void (*done)(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_TRANSFORM 2 /* transform SCSI commands */ #define PC_DMA_OK 4 /* Use DMA */ /* * SCSI command transformation layer */ #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */ #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */ /* * Log flags */ #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */ #define IDESCSI_DEVFS typedef struct { ide_drive_t *drive; 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 */ int id; /* id */ #ifdef IDESCSI_DEVFS devfs_handle_t de; /* pointer to IDE device */ #endif /* IDESCSI_DEVFS */ } idescsi_scsi_t; /* * 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; while (bcount) { if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { printk(KERN_ERR "ide-scsi: scatter gather " "table too small, discarding data\n"); idescsi_discard_data(drive, bcount); return; } count = IDE_MIN(pc->sg->length - pc->b_count, bcount); HWIF(drive)->atapi_input_bytes(drive, pc->sg->address + pc->b_count, count); bcount -= count; pc->b_count += count; if (pc->b_count == pc->sg->length) { pc->sg++; pc->b_count = 0; } } } static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) { int count; while (bcount) { if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { printk(KERN_ERR "ide-scsi: scatter gather table " "too small, padding with zeros\n"); idescsi_output_zeros(drive, bcount); return; } count = IDE_MIN(pc->sg->length - pc->b_count, bcount); HWIF(drive)->atapi_output_bytes(drive, pc->sg->address + pc->b_count, count); bcount -= count; pc->b_count += count; if (pc->b_count == pc->sg->length) { pc->sg++; pc->b_count = 0; } } } /* * Most of the SCSI commands are supported directly by ATAPI devices. * idescsi_transform_pc handles the few exceptions. */ static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc) { u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd; char *atapi_buf; if (!test_bit(PC_TRANSFORM, &pc->flags)) return; if (drive->media == ide_cdrom || drive->media == ide_optical) { if (c[0] == READ_6 || c[0] == WRITE_6) { c[8] = c[4]; c[5] = c[3]; c[4] = c[2]; c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0; c[0] += (READ_10 - READ_6); } if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) { unsigned short new_len; if (!scsi_buf) return; if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL) return; memset(atapi_buf, 0, pc->buffer_size + 4); memset (c, 0, 12); c[0] = sc[0] | 0x40; c[1] = sc[1]; c[2] = sc[2]; new_len = sc[4] + 4; c[8] = new_len; c[7] = new_len >> 8; c[9] = sc[5]; if (c[0] == MODE_SELECT_10) { /* Mode data length */ atapi_buf[1] = scsi_buf[0]; /* Medium type */ atapi_buf[2] = scsi_buf[1]; /* Device specific parameter */ atapi_buf[3] = scsi_buf[2]; /* Block descriptor length */ atapi_buf[7] = scsi_buf[3]; memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4); } pc->buffer = atapi_buf; pc->request_transfer += 4; pc->buffer_size += 4; } } } static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc) { u8 *atapi_buf = pc->buffer; u8 *sc = pc->scsi_cmd->cmnd; u8 *scsi_buf = pc->scsi_cmd->request_buffer; if (!test_bit(PC_TRANSFORM, &pc->flags)) return; if (drive->media == ide_cdrom || drive->media == ide_optical) { if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) { /* Mode data length */ scsi_buf[0] = atapi_buf[1]; /* Medium type */ scsi_buf[1] = atapi_buf[2]; /* Device specific parameter */ scsi_buf[2] = atapi_buf[3]; /* Block descriptor length */ scsi_buf[3] = atapi_buf[7]; memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8); } if (pc->c[0] == INQUIRY) { /* ansi_revision */ scsi_buf[2] |= 2; /* response data format */ scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; } } if (atapi_buf && atapi_buf != scsi_buf) kfree(atapi_buf); } static inline void idescsi_free_bh (struct buffer_head *bh) { struct buffer_head *bhp; while (bh) { bhp = bh; bh = bh->b_reqnext; kfree (bhp); } } static void hexdump(u8 *x, int len) { int i; printk("[ "); for (i = 0; i < len; i++) printk("%x ", x[i]); printk("]\n"); } static int idescsi_do_end_request (ide_drive_t *drive, int uptodate) { struct request *rq; unsigned long flags; int ret = 1; spin_lock_irqsave(&io_request_lock, flags); rq = HWGROUP(drive)->rq; /* * decide whether to reenable DMA -- 3 is a random magic for now, * if we DMA timeout more than 3 times, just stay in PIO */ if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) { drive->state = 0; HWGROUP(drive)->hwif->ide_dma_on(drive); } if (!end_that_request_first(rq, uptodate, drive->name)) { add_blkdev_randomness(MAJOR(rq->rq_dev)); blkdev_dequeue_request(rq); HWGROUP(drive)->rq = NULL; end_that_request_last(rq); ret = 0; } spin_unlock_irqrestore(&io_request_lock, flags); return ret; } static int idescsi_end_request (ide_drive_t *drive, int uptodate) { idescsi_scsi_t *scsi = drive->driver_data; struct request *rq = HWGROUP(drive)->rq; idescsi_pc_t *pc = (idescsi_pc_t *) rq->special; int log = test_bit(IDESCSI_LOG_CMD, &scsi->log); u8 *scsi_buf; unsigned long flags; if (rq->cmd != IDESCSI_PC_RQ) { idescsi_do_end_request(drive, uptodate); return 0; } ide_end_drive_cmd(drive, 0, 0); if (rq->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 (rq->errors) { pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16); if (log) printk("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number); } else { pc->scsi_cmd->result = DID_OK << 16; idescsi_transform_pc2(drive, pc); if (log) { printk("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number); if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) { printk(", rst = "); scsi_buf = pc->scsi_cmd->request_buffer; hexdump(scsi_buf, IDE_MIN(16, pc->scsi_cmd->request_bufflen)); } else printk("\n"); } } spin_lock_irqsave(&io_request_lock, flags); pc->done(pc->scsi_cmd); spin_unlock_irqrestore(&io_request_lock, flags); idescsi_free_bh(rq->bh); kfree(pc); kfree(rq); scsi->pc = NULL; return 0; } static inline unsigned long get_timeout(idescsi_pc_t *pc) { return IDE_MAX(WAIT_CMD, pc->timeout - jiffies); } /* * Our interrupt handler. */ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive) { idescsi_scsi_t *scsi = drive->driver_data; idescsi_pc_t *pc = scsi->pc; struct request *rq = pc->rq; atapi_bcount_t bcount; atapi_status_t status; atapi_ireason_t ireason; atapi_feature_t feature; unsigned int temp; #if IDESCSI_DEBUG_LOG printk(KERN_INFO "ide-scsi: Reached idescsi_pc_intr " "interrupt handler\n"); #endif /* IDESCSI_DEBUG_LOG */ 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)); } feature.all = 0; /* Clear the interrupt */ status.all = HWIF(drive)->INB(IDE_STATUS_REG); if (!status.b.drq) { /* 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(); if (status.b.check) rq->errors++; idescsi_end_request(drive, 1); return ide_stopped; } bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG); bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG); ireason.all = HWIF(drive)->INB(IDE_IREASON_REG); if (ireason.b.cod) { printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n"); return ide_do_reset(drive); } if (ireason.b.io) { temp = pc->actually_transferred + bcount.all; 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"); printk(KERN_ERR "ide-scsi: ["); hexdump(pc->c, 12); printk("]\n"); printk(KERN_ERR "ide-scsi: expected %d got %d limit %d\n", pc->request_transfer, temp, pc->buffer_size); 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 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, temp); printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all); } pc->actually_transferred += temp; pc->current_position += temp; idescsi_discard_data(drive, bcount.all - temp); if (HWGROUP(drive)->handler != NULL) BUG(); ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); 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.b.io) { clear_bit(PC_WRITING, &pc->flags); if (pc->sg) idescsi_input_buffers(drive, pc, bcount.all); else HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all); } else { set_bit(PC_WRITING, &pc->flags); if (pc->sg) idescsi_output_buffers(drive, pc, bcount.all); else HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all); } /* Update the current position */ pc->actually_transferred += bcount.all; pc->current_position += bcount.all; if (HWGROUP(drive)->handler != NULL) BUG(); /* And set the interrupt handler again */ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); return ide_started; } static ide_startstop_t idescsi_transfer_pc (ide_drive_t *drive) { idescsi_scsi_t *scsi = drive->driver_data; idescsi_pc_t *pc = scsi->pc; atapi_ireason_t ireason; ide_startstop_t startstop; 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.all = HWIF(drive)->INB(IDE_IREASON_REG); if (!ireason.b.cod || ireason.b.io) { printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while " "issuing a packet command\n"); return ide_do_reset(drive); } if (HWGROUP(drive)->handler != NULL) BUG(); /* Set the interrupt routine */ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); /* Send the actual packet */ HWIF(drive)->atapi_output_bytes(drive, scsi->pc->c, 12); if (test_bit (PC_DMA_OK, &pc->flags)) { set_bit(PC_DMA_IN_PROGRESS, &pc->flags); (void) (HWIF(drive)->ide_dma_begin(drive)); } return ide_started; } /* * Issue a packet command */ static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc) { idescsi_scsi_t *scsi = drive->driver_data; atapi_feature_t feature; atapi_bcount_t bcount; struct request *rq = pc->rq; feature.all = 0; /* Set the current packet command */ scsi->pc = pc; /* We haven't transferred any data yet */ pc->actually_transferred = 0; pc->current_position = pc->buffer; /* Request to transfer the entire buffer at once */ bcount.all = IDE_MIN(pc->request_transfer, 63 * 1024); if (drive->using_dma && rq->bh) { if (test_bit(PC_WRITING, &pc->flags)) feature.b.dma = !HWIF(drive)->ide_dma_write(drive); else feature.b.dma = !HWIF(drive)->ide_dma_read(drive); } SELECT_DRIVE(drive); if (IDE_CONTROL_REG) HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG); HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG); HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG); HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG); if (feature.b.dma) { set_bit(PC_DMA_OK, &pc->flags); } if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) { if (HWGROUP(drive)->handler != NULL) BUG(); ide_set_handler(drive, &idescsi_transfer_pc, get_timeout(pc), NULL); /* 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, unsigned long block) { #if IDESCSI_DEBUG_LOG printk(KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n", rq->rq_status, (unsigned int) rq->rq_dev, rq->cmd, rq->errors); printk(KERN_INFO "sector: %ld, nr_sectors: %ld, " "current_nr_sectors: %ld\n", rq->sector, rq->nr_sectors, rq->current_nr_sectors); #endif /* IDESCSI_DEBUG_LOG */ if (rq->cmd == IDESCSI_PC_RQ) { return idescsi_issue_pc(drive, rq->special); } printk(KERN_ERR "ide-scsi: %s: unsupported command in request " "queue (%x)\n", drive->name, rq->cmd); idescsi_end_request(drive, 0); return ide_stopped; } static int idescsi_do_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { /* need to figure out how to parse scsi-atapi media type */ return -EINVAL; } static int idescsi_ide_open (struct inode *inode, struct file *filp, ide_drive_t *drive) { MOD_INC_USE_COUNT; return 0; } static void idescsi_ide_release (struct inode *inode, struct file *filp, ide_drive_t *drive) { MOD_DEC_USE_COUNT; } static ide_drive_t *idescsi_drives[MAX_HWIFS * MAX_DRIVES]; static int idescsi_initialized = 0; static int drive_count = 0; static void idescsi_add_settings(ide_drive_t *drive) { idescsi_scsi_t *scsi = drive->driver_data; /* * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function */ ide_add_setting(drive, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL); ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL); ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL); ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL); ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL); } /* * Driver initialization. */ static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi, int id) { int minor = (drive->select.b.unit) << PARTN_BITS; DRIVER(drive)->busy++; idescsi_drives[id] = drive; drive->driver_data = scsi; drive->ready_stat = 0; memset(scsi, 0, sizeof(idescsi_scsi_t)); scsi->drive = drive; scsi->id = id; if (drive->id && (drive->id->config & 0x0060) == 0x20) set_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags); set_bit(IDESCSI_TRANSFORM, &scsi->transform); 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); #ifdef IDESCSI_DEVFS scsi->de = devfs_register(drive->de, "generic", DEVFS_FL_DEFAULT, HWIF(drive)->major, minor, S_IFBLK | S_IRUSR | S_IWUSR, ide_fops, NULL); #endif /* IDESCSI_DEVFS */ drive_count++; DRIVER(drive)->busy--; } static int idescsi_cleanup (ide_drive_t *drive) { idescsi_scsi_t *scsi = drive->driver_data; if (ide_unregister_subdriver(drive)) { printk("%s: %s: failed to unregister! \n", __FUNCTION__, drive->name); printk("%s: usage %d, busy %d, driver %p, Dbusy %d\n", drive->name, drive->usage, drive->busy, drive->driver, DRIVER(drive)->busy); return 1; } idescsi_drives[scsi->id] = NULL; #ifdef IDESCSI_DEVFS if (scsi->de) devfs_unregister(scsi->de); #endif /* IDESCSI_DEVFS */ drive->driver_data = NULL; kfree(scsi); drive_count--; return 0; } int idescsi_init(void); int idescsi_attach(ide_drive_t *drive); /* * IDE subdriver functions, registered with ide.c */ static ide_driver_t idescsi_driver = { name: "ide-scsi", version: IDESCSI_VERSION, media: ide_scsi, busy: 0, #ifdef CONFIG_IDEDMA_ONLYDISK supports_dma: 0, #else supports_dma: 1, #endif supports_dsc_overlap: 0, cleanup: idescsi_cleanup, standby: NULL, suspend: NULL, resume: NULL, flushcache: NULL, do_request: idescsi_do_request, end_request: idescsi_end_request, sense: NULL, error: NULL, ioctl: idescsi_do_ioctl, open: idescsi_ide_open, release: idescsi_ide_release, media_change: NULL, revalidate: NULL, pre_reset: NULL, capacity: NULL, special: NULL, proc: NULL, init: idescsi_init, attach: idescsi_attach, ata_prebuilder: NULL, atapi_prebuilder: NULL, }; static ide_module_t idescsi_module = { IDE_DRIVER_MODULE, idescsi_init, &idescsi_driver, NULL }; int idescsi_attach (ide_drive_t *drive) { idescsi_scsi_t *scsi; u8 media[] = { TYPE_DISK, /* 0x00 */ TYPE_TAPE, /* 0x01 */ TYPE_PRINTER, /* 0x02 */ TYPE_PROCESSOR, /* 0x03 */ TYPE_WORM, /* 0x04 */ TYPE_ROM, /* 0x05 */ TYPE_SCANNER, /* 0x06 */ TYPE_MOD, /* 0x07 */ 255}; int i = 0, ret = 0, id = 0; // int id = 2 * HWIF(drive)->index + drive->select.b.unit; // int id = drive_count + 1; for (id = 0; id < MAX_HWIFS*MAX_DRIVES; id++) if (idescsi_drives[id] == NULL) break; printk("%s: id = %d\n", drive->name, id); if ((!idescsi_initialized) || (drive->media == ide_disk)) { printk(KERN_ERR "ide-scsi: (%sinitialized) %s: " "media-type (%ssupported)\n", (idescsi_initialized) ? "" : "! ", drive->name, (drive->media == ide_disk) ? "! " : ""); return (drive->media == ide_disk) ? 2 : 0; } MOD_INC_USE_COUNT; for (i = 0; media[i] != 255; i++) { if (drive->media != media[i]) continue; else break; } if ((scsi = (idescsi_scsi_t *) kmalloc(sizeof(idescsi_scsi_t), GFP_KERNEL)) == NULL) { printk(KERN_ERR "ide-scsi: %s: Can't allocate a scsi " "structure\n", drive->name); ret = 1; goto bye_game_over; } if (ide_register_subdriver(drive, &idescsi_driver, IDE_SUBDRIVER_VERSION)) { printk(KERN_ERR "ide-scsi: %s: Failed to register the " "driver with ide.c\n", drive->name); kfree(scsi); ret = 1; goto bye_game_over; } idescsi_setup(drive, scsi, id); // scan_scsis(HBA, 1, channel, id, lun); bye_game_over: MOD_DEC_USE_COUNT; return ret; } #ifdef MODULE /* options */ char *ignore = NULL; MODULE_PARM(ignore, "s"); #endif int idescsi_init (void) { #ifdef CLASSIC_BUILTINS_METHOD ide_drive_t *drive; idescsi_scsi_t *scsi; u8 media[] = { TYPE_DISK, /* 0x00 */ TYPE_TAPE, /* 0x01 */ TYPE_PRINTER, /* 0x02 */ TYPE_PROCESSOR, /* 0x03 */ TYPE_WORM, /* 0x04 */ TYPE_ROM, /* 0x05 */ TYPE_SCANNER, /* 0x06 */ TYPE_MOD, /* 0x07 */ 255}; int i, failed, id; if (idescsi_initialized) return 0; idescsi_initialized = 1; for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++) idescsi_drives[i] = NULL; MOD_INC_USE_COUNT; for (i = 0; media[i] != 255; i++) { failed = 0; while ((drive = ide_scan_devices(media[i], idescsi_driver.name, NULL, failed++)) != NULL) { #ifdef MODULE /* skip drives we were told to ignore */ if (ignore != NULL && strstr(ignore, drive->name)) { printk("ide-scsi: ignoring drive %s\n", drive->name); continue; } #endif if ((scsi = (idescsi_scsi_t *) kmalloc(sizeof(idescsi_scsi_t), GFP_KERNEL)) == NULL) { printk(KERN_ERR "ide-scsi: %s: Can't allocate " "a scsi structure\n", drive->name); continue; } if (ide_register_subdriver(drive, &idescsi_driver, IDE_SUBDRIVER_VERSION)) { printk(KERN_ERR "ide-scsi: %s: Failed to " "register the driver with ide.c\n", drive->name); kfree(scsi); continue; } for (id = 0; id < MAX_HWIFS*MAX_DRIVES && idescsi_drives[id]; id++); idescsi_setup(drive, scsi, id); failed--; } } #else /* ! CLASSIC_BUILTINS_METHOD */ int i; if (idescsi_initialized) return 0; idescsi_initialized = 1; for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++) idescsi_drives[i] = NULL; MOD_INC_USE_COUNT; #endif /* CLASSIC_BUILTINS_METHOD */ ide_register_module(&idescsi_module); MOD_DEC_USE_COUNT; return 0; } int idescsi_detect (Scsi_Host_Template *host_template) { struct Scsi_Host *host; int id; int last_lun = 0; host_template->proc_name = "ide-scsi"; host = scsi_register(host_template, 0); if (host == NULL) { printk(KERN_WARNING "%s: host failure!\n", __FUNCTION__); return 0; } for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++) last_lun = IDE_MAX(last_lun, idescsi_drives[id]->last_lun); host->max_id = id; host->max_lun = last_lun + 1; host->can_queue = host->cmd_per_lun * id; return 1; } int idescsi_release (struct Scsi_Host *host) { ide_drive_t *drive; int id; for (id = 0; id < MAX_HWIFS * MAX_DRIVES; id++) { drive = idescsi_drives[id]; if (drive) DRIVER(drive)->busy = 0; } return 0; } const char *idescsi_info (struct Scsi_Host *host) { return "SCSI host adapter emulation for IDE ATAPI devices"; } int idescsi_ioctl (Scsi_Device *dev, int cmd, void *arg) { ide_drive_t *drive = idescsi_drives[dev->id]; idescsi_scsi_t *scsi = drive->driver_data; 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 *) arg); return -EINVAL; } static inline struct buffer_head *idescsi_kmalloc_bh (int count) { struct buffer_head *bh, *bhp, *first_bh; if ((first_bh = bhp = bh = kmalloc(sizeof(struct buffer_head), GFP_ATOMIC)) == NULL) goto abort; memset(bh, 0, sizeof(struct buffer_head)); bh->b_reqnext = NULL; while (--count) { if ((bh = kmalloc(sizeof(struct buffer_head), GFP_ATOMIC)) == NULL) goto abort; memset(bh, 0, sizeof(struct buffer_head)); bhp->b_reqnext = bh; bhp = bh; bh->b_reqnext = NULL; } return first_bh; abort: idescsi_free_bh(first_bh); return NULL; } 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 inline struct buffer_head *idescsi_dma_bh (ide_drive_t *drive, idescsi_pc_t *pc) { struct buffer_head *bh = NULL, *first_bh = NULL; int segments = pc->scsi_cmd->use_sg; struct scatterlist *sg = pc->scsi_cmd->request_buffer; if (!drive->using_dma || !pc->request_transfer || pc->request_transfer & 1023) return NULL; if (idescsi_set_direction(pc)) return NULL; if (segments) { if ((first_bh = bh = idescsi_kmalloc_bh(segments)) == NULL) return NULL; #if IDESCSI_DEBUG_LOG printk("ide-scsi: %s: building DMA table, %d segments, " "%dkB total\n", drive->name, segments, pc->request_transfer >> 10); #endif /* IDESCSI_DEBUG_LOG */ while (segments--) { #if 1 bh->b_data = sg->address; #else if (sg->address) { bh->b_page = virt_to_page(sg->address); bh->b_data = (char *) ((unsigned long) sg->address & ~PAGE_MASK); } else if (sg->page) { bh->b_page = sg->page; bh->b_data = (char *) sg->offset; } #endif bh->b_size = sg->length; bh = bh->b_reqnext; sg++; } } else { /* * non-sg requests are guarenteed not to reside in highmem /jens */ if ((first_bh = bh = idescsi_kmalloc_bh(1)) == NULL) return NULL; #if IDESCSI_DEBUG_LOG printk("ide-scsi: %s: building DMA table for a single " "buffer (%dkB)\n", drive->name, pc->request_transfer >> 10); #endif /* IDESCSI_DEBUG_LOG */ bh->b_data = pc->scsi_cmd->request_buffer; bh->b_size = pc->request_transfer; } return first_bh; } static inline int should_transform(ide_drive_t *drive, Scsi_Cmnd *cmd) { idescsi_scsi_t *scsi = drive->driver_data; if (MAJOR(cmd->request.rq_dev) == SCSI_GENERIC_MAJOR) return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); return test_bit(IDESCSI_TRANSFORM, &scsi->transform); } int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) { ide_drive_t *drive = idescsi_drives[cmd->target]; idescsi_scsi_t *scsi; struct request *rq = NULL; idescsi_pc_t *pc = NULL; if (!drive) { printk(KERN_ERR "ide-scsi: drive id %d not present\n", cmd->target); goto abort; } scsi = drive->driver_data; 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); if (cmd->use_sg) { pc->buffer = NULL; pc->sg = cmd->request_buffer; } else { pc->buffer = cmd->request_buffer; pc->sg = NULL; } pc->b_count = 0; pc->request_transfer = pc->buffer_size = cmd->request_bufflen; pc->scsi_cmd = cmd; pc->done = done; pc->timeout = jiffies + cmd->timeout_per_command; if (should_transform(drive, cmd)) set_bit(PC_TRANSFORM, &pc->flags); idescsi_transform_pc1(drive, pc); if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { printk("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number); hexdump(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); hexdump(pc->c, 12); } } ide_init_drive_cmd(rq); rq->special = pc; rq->bh = idescsi_dma_bh(drive, pc); rq->cmd = IDESCSI_PC_RQ; spin_unlock_irq(&io_request_lock); (void) ide_do_drive_cmd(drive, rq, ide_end); spin_lock_irq(&io_request_lock); return 0; abort: if (pc) kfree(pc); if (rq) kfree(rq); cmd->result = DID_ERROR << 16; done(cmd); return 0; } int idescsi_abort (Scsi_Cmnd *cmd) { return SCSI_ABORT_SNOOZE; } int idescsi_reset (Scsi_Cmnd *cmd, unsigned int resetflags) { return SCSI_RESET_SNOOZE; #ifdef WORK_IN_PROGRESS ide_drive_t *drive = idescsi_drives[cmd->target]; /* At this point the state machine is running, that requires we are especially careful. Ideally we want to abort commands on timeout only if they hit the cable but thats harder */ DRIVER(drive)->abort(drive, "scsi reset"); if(HWGROUP(drive)->handler) BUG(); /* Ok the state machine is halted but make sure it doesn't restart too early */ HWGROUP(drive)->busy = 1; spin_unlock_irq(&io_request_lock); /* Apply the mallet of re-education firmly to the drive */ ide_do_reset(drive); /* At this point the reset state machine is running and its termination will kick off the next command */ spin_lock_irq(&io_request_lock); return SCSI_RESET_SUCCESS; #endif } int idescsi_bios (Disk *disk, kdev_t dev, int *parm) { ide_drive_t *drive = idescsi_drives[disk->device->id]; 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 Scsi_Host_Template idescsi_template = IDESCSI; static int __init init_idescsi_module(void) { drive_count = 0; idescsi_init(); idescsi_template.module = THIS_MODULE; scsi_register_module(MODULE_SCSI_HA, &idescsi_template); return 0; } static void __exit exit_idescsi_module(void) { ide_drive_t *drive; u8 media[] = {TYPE_DISK, TYPE_TAPE, TYPE_PROCESSOR, TYPE_WORM, TYPE_ROM, TYPE_SCANNER, TYPE_MOD, 255}; int i, failed; scsi_unregister_module(MODULE_SCSI_HA, &idescsi_template); for (i = 0; media[i] != 255; i++) { failed = 0; while ((drive = ide_scan_devices(media[i], idescsi_driver.name, &idescsi_driver, failed)) != NULL) if (idescsi_cleanup(drive)) { printk("%s: exit_idescsi_module() called while still busy\n", drive->name); failed++; } } ide_unregister_module(&idescsi_module); } module_init(init_idescsi_module); module_exit(exit_idescsi_module); MODULE_LICENSE("GPL");