/*
* 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");
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