Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
new file mode 100644
index 0000000..2e2486b
--- /dev/null
+++ b/drivers/scsi/ide-scsi.c
@@ -0,0 +1,1174 @@
+/*
+ * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999
+ *
+ * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
+ */
+
+/*
+ * 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 Jun 10 02 Fix "off by one" error in transforms
+ * Ver 0.92 Dec 31 02 Implement new SCSI mid level API
+ */
+
+#define IDESCSI_VERSION "0.92"
+
+#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 <linux/scatterlist.h>
+
+#include <asm/io.h>
+#include <asm/bitops.h>
+#include <asm/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.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 */
+ struct scsi_cmnd *scsi_cmd; /* SCSI command */
+ void (*done)(struct 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_TIMEDOUT 3 /* command timed out */
+#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 */
+
+typedef struct ide_scsi_obj {
+ ide_drive_t *drive;
+ ide_driver_t *driver;
+ struct gendisk *disk;
+ struct Scsi_Host *host;
+
+ 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 */
+} idescsi_scsi_t;
+
+static DECLARE_MUTEX(idescsi_ref_sem);
+
+#define ide_scsi_g(disk) \
+ container_of((disk)->private_data, struct ide_scsi_obj, driver)
+
+static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
+{
+ struct ide_scsi_obj *scsi = NULL;
+
+ down(&idescsi_ref_sem);
+ scsi = ide_scsi_g(disk);
+ if (scsi)
+ scsi_host_get(scsi->host);
+ up(&idescsi_ref_sem);
+ return scsi;
+}
+
+static void ide_scsi_put(struct ide_scsi_obj *scsi)
+{
+ down(&idescsi_ref_sem);
+ scsi_host_put(scsi->host);
+ up(&idescsi_ref_sem);
+}
+
+static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
+{
+ return (idescsi_scsi_t*) (&host[1]);
+}
+
+static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
+{
+ return scsihost_to_idescsi(ide_drive->driver_data);
+}
+
+/*
+ * 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;
+ char *buf;
+
+ 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 = min(pc->sg->length - pc->b_count, bcount);
+ buf = page_address(pc->sg->page) + pc->sg->offset;
+ drive->hwif->atapi_input_bytes(drive, buf + 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;
+ char *buf;
+
+ 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 = min(pc->sg->length - pc->b_count, bcount);
+ buf = page_address(pc->sg->page) + pc->sg->offset;
+ drive->hwif->atapi_output_bytes(drive, buf + 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) {
+ atapi_buf[1] = scsi_buf[0]; /* Mode data length */
+ atapi_buf[2] = scsi_buf[1]; /* Medium type */
+ atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */
+ atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */
+ 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) {
+ scsi_buf[0] = atapi_buf[1]; /* Mode data length */
+ scsi_buf[1] = atapi_buf[2]; /* Medium type */
+ scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */
+ scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */
+ memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
+ }
+ if (pc->c[0] == INQUIRY) {
+ scsi_buf[2] |= 2; /* ansi_revision */
+ scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
+ }
+ }
+ if (atapi_buf && atapi_buf != scsi_buf)
+ kfree(atapi_buf);
+}
+
+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_check_condition(ide_drive_t *drive, struct request *failed_command)
+{
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+ idescsi_pc_t *pc;
+ struct request *rq;
+ u8 *buf;
+
+ /* stuff a sense request in front of our current request */
+ pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
+ rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
+ buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
+ if (pc == NULL || rq == NULL || buf == NULL) {
+ if (pc) kfree(pc);
+ if (rq) kfree(rq);
+ if (buf) kfree(buf);
+ return -ENOMEM;
+ }
+ memset (pc, 0, sizeof (idescsi_pc_t));
+ memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
+ ide_init_drive_cmd(rq);
+ rq->special = (char *) pc;
+ pc->rq = rq;
+ pc->buffer = buf;
+ pc->c[0] = REQUEST_SENSE;
+ pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
+ rq->flags = REQ_SENSE;
+ pc->timeout = jiffies + WAIT_READY;
+ /* NOTE! Save the failed packet command in "rq->buffer" */
+ rq->buffer = (void *) failed_command->special;
+ pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
+ printk ("ide-scsi: %s: queue cmd = ", drive->name);
+ hexdump(pc->c, 6);
+ }
+ rq->rq_disk = scsi->disk;
+ return ide_do_drive_cmd(drive, rq, ide_preempt);
+}
+
+static int idescsi_end_request(ide_drive_t *, int, int);
+
+static ide_startstop_t
+idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
+{
+ if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
+ /* force an abort */
+ HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
+
+ rq->errors++;
+
+ idescsi_end_request(drive, 0, 0);
+
+ return ide_stopped;
+}
+
+static ide_startstop_t
+idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
+{
+#if IDESCSI_DEBUG_LOG
+ printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
+ ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
+#endif
+ rq->errors |= ERROR_MAX;
+
+ idescsi_end_request(drive, 0, 0);
+
+ return ide_stopped;
+}
+
+static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
+{
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+ struct request *rq = HWGROUP(drive)->rq;
+ idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
+ int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
+ struct Scsi_Host *host;
+ u8 *scsi_buf;
+ unsigned long flags;
+
+ if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
+ ide_end_request(drive, uptodate, nrsecs);
+ return 0;
+ }
+ ide_end_drive_cmd (drive, 0, 0);
+ if (rq->flags & REQ_SENSE) {
+ idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
+ if (log) {
+ printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
+ hexdump(pc->buffer,16);
+ }
+ memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
+ kfree(pc->buffer);
+ kfree(pc);
+ kfree(rq);
+ pc = opc;
+ rq = pc->rq;
+ pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
+ ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
+ } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
+ if (log)
+ printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
+ drive->name, pc->scsi_cmd->serial_number);
+ pc->scsi_cmd->result = DID_TIME_OUT << 16;
+ } else 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) {
+ if (log)
+ printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
+ if (!idescsi_check_condition(drive, rq))
+ /* we started a request sense, so we'll be back, exit for now */
+ return 0;
+ pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
+ } 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, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
+ } else printk("\n");
+ }
+ }
+ host = pc->scsi_cmd->device->host;
+ spin_lock_irqsave(host->host_lock, flags);
+ pc->done(pc->scsi_cmd);
+ spin_unlock_irqrestore(host->host_lock, flags);
+ kfree(pc);
+ kfree(rq);
+ scsi->pc = NULL;
+ return 0;
+}
+
+static inline unsigned long get_timeout(idescsi_pc_t *pc)
+{
+ return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
+}
+
+static int idescsi_expiry(ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive->driver_data;
+ idescsi_pc_t *pc = scsi->pc;
+
+#if IDESCSI_DEBUG_LOG
+ printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
+#endif
+ set_bit(PC_TIMEDOUT, &pc->flags);
+
+ return 0; /* we do not want the ide subsystem to retry */
+}
+
+/*
+ * Our interrupt handler.
+ */
+static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+ 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_bit(PC_TIMEDOUT, &pc->flags)){
+#if IDESCSI_DEBUG_LOG
+ printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
+ pc->scsi_cmd->serial_number, jiffies);
+#endif
+ /* end this request now - scsi should retry it*/
+ idescsi_end_request (drive, 1, 0);
+ return ide_stopped;
+ }
+ 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, 0);
+ 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");
+ 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
+ drive->hwif->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);
+ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
+ 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;
+
+ /* And set the interrupt handler again */
+ ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
+ return ide_started;
+}
+
+static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+ 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), idescsi_expiry);
+ /* Send the actual packet */
+ drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
+ if (test_bit (PC_DMA_OK, &pc->flags)) {
+ set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
+ hwif->dma_start(drive);
+ }
+ return ide_started;
+}
+
+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 int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ struct scatterlist *sg, *scsi_sg;
+ int segments;
+
+ if (!pc->request_transfer || pc->request_transfer % 1024)
+ return 1;
+
+ if (idescsi_set_direction(pc))
+ return 1;
+
+ sg = hwif->sg_table;
+ scsi_sg = pc->scsi_cmd->request_buffer;
+ segments = pc->scsi_cmd->use_sg;
+
+ if (segments > hwif->sg_max_nents)
+ return 1;
+
+ if (!segments) {
+ hwif->sg_nents = 1;
+ sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
+ } else {
+ hwif->sg_nents = segments;
+ memcpy(sg, scsi_sg, sizeof(*sg) * segments);
+ }
+
+ return 0;
+}
+
+/*
+ * Issue a packet command
+ */
+static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
+{
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+ ide_hwif_t *hwif = drive->hwif;
+ atapi_feature_t feature;
+ atapi_bcount_t bcount;
+
+ scsi->pc=pc; /* Set the current packet command */
+ pc->actually_transferred=0; /* We haven't transferred any data yet */
+ pc->current_position=pc->buffer;
+ bcount.all = min(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
+
+ feature.all = 0;
+ if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
+ hwif->sg_mapped = 1;
+ feature.b.dma = !hwif->dma_setup(drive);
+ hwif->sg_mapped = 0;
+ }
+
+ 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), idescsi_expiry);
+ /* 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, sector_t block)
+{
+#if IDESCSI_DEBUG_LOG
+ printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
+ printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
+#endif /* IDESCSI_DEBUG_LOG */
+
+ if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
+ return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
+ }
+ blk_dump_rq_flags(rq, "ide-scsi: unsup command");
+ idescsi_end_request (drive, 0, 0);
+ return ide_stopped;
+}
+
+static void idescsi_add_settings(ide_drive_t *drive)
+{
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+
+/*
+ * 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)
+{
+ DRIVER(drive)->busy++;
+ 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);
+ DRIVER(drive)->busy--;
+}
+
+static int idescsi_cleanup (ide_drive_t *drive)
+{
+ struct Scsi_Host *scsihost = drive->driver_data;
+ struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
+ struct gendisk *g = scsi->disk;
+
+ if (ide_unregister_subdriver(drive))
+ return 1;
+
+ ide_unregister_region(g);
+
+ drive->driver_data = NULL;
+ g->private_data = NULL;
+ put_disk(g);
+
+ scsi_remove_host(scsihost);
+ ide_scsi_put(scsi);
+
+ return 0;
+}
+
+static int idescsi_attach(ide_drive_t *drive);
+
+#ifdef CONFIG_PROC_FS
+static ide_proc_entry_t idescsi_proc[] = {
+ { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
+ { NULL, 0, NULL, NULL }
+};
+#else
+# define idescsi_proc NULL
+#endif
+
+/*
+ * IDE subdriver functions, registered with ide.c
+ */
+static ide_driver_t idescsi_driver = {
+ .owner = THIS_MODULE,
+ .name = "ide-scsi",
+ .version = IDESCSI_VERSION,
+ .media = ide_scsi,
+ .busy = 0,
+ .supports_dsc_overlap = 0,
+ .proc = idescsi_proc,
+ .attach = idescsi_attach,
+ .cleanup = idescsi_cleanup,
+ .do_request = idescsi_do_request,
+ .end_request = idescsi_end_request,
+ .error = idescsi_atapi_error,
+ .abort = idescsi_atapi_abort,
+ .drives = LIST_HEAD_INIT(idescsi_driver.drives),
+};
+
+static int idescsi_ide_open(struct inode *inode, struct file *filp)
+{
+ struct gendisk *disk = inode->i_bdev->bd_disk;
+ struct ide_scsi_obj *scsi;
+ ide_drive_t *drive;
+
+ if (!(scsi = ide_scsi_get(disk)))
+ return -ENXIO;
+
+ drive = scsi->drive;
+
+ drive->usage++;
+
+ return 0;
+}
+
+static int idescsi_ide_release(struct inode *inode, struct file *filp)
+{
+ struct gendisk *disk = inode->i_bdev->bd_disk;
+ struct ide_scsi_obj *scsi = ide_scsi_g(disk);
+ ide_drive_t *drive = scsi->drive;
+
+ drive->usage--;
+
+ ide_scsi_put(scsi);
+
+ return 0;
+}
+
+static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct block_device *bdev = inode->i_bdev;
+ struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
+ return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
+}
+
+static struct block_device_operations idescsi_ops = {
+ .owner = THIS_MODULE,
+ .open = idescsi_ide_open,
+ .release = idescsi_ide_release,
+ .ioctl = idescsi_ide_ioctl,
+};
+
+static int idescsi_attach(ide_drive_t *drive);
+
+static int idescsi_slave_configure(struct scsi_device * sdp)
+{
+ /* Configure detected device */
+ scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
+ return 0;
+}
+
+static const char *idescsi_info (struct Scsi_Host *host)
+{
+ return "SCSI host adapter emulation for IDE ATAPI devices";
+}
+
+static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
+{
+ idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
+
+ 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 __user *) arg);
+ return -EINVAL;
+}
+
+static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
+{
+ idescsi_scsi_t *scsi = drive_to_idescsi(drive);
+
+ /* this was a layering violation and we can't support it
+ anymore, sorry. */
+#if 0
+ struct gendisk *disk = cmd->request->rq_disk;
+
+ if (disk) {
+ struct Scsi_Device_Template **p = disk->private_data;
+ if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
+ return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
+ }
+#endif
+ return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
+}
+
+static int idescsi_queue (struct scsi_cmnd *cmd,
+ void (*done)(struct scsi_cmnd *))
+{
+ struct Scsi_Host *host = cmd->device->host;
+ idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
+ ide_drive_t *drive = scsi->drive;
+ struct request *rq = NULL;
+ idescsi_pc_t *pc = NULL;
+
+ if (!drive) {
+ printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
+ goto abort;
+ }
+ scsi = drive_to_idescsi(drive);
+ 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 = (char *) pc;
+ rq->flags = REQ_SPECIAL;
+ spin_unlock_irq(host->host_lock);
+ rq->rq_disk = scsi->disk;
+ (void) ide_do_drive_cmd (drive, rq, ide_end);
+ spin_lock_irq(host->host_lock);
+ return 0;
+abort:
+ if (pc) kfree (pc);
+ if (rq) kfree (rq);
+ cmd->result = DID_ERROR << 16;
+ done(cmd);
+ return 0;
+}
+
+static int idescsi_eh_abort (struct scsi_cmnd *cmd)
+{
+ idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
+ ide_drive_t *drive = scsi->drive;
+ int busy;
+ int ret = FAILED;
+
+ /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
+
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
+ printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
+
+ if (!drive) {
+ printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
+ WARN_ON(1);
+ goto no_drive;
+ }
+
+ /* First give it some more time, how much is "right" is hard to say :-( */
+
+ busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
+ printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
+
+ spin_lock_irq(&ide_lock);
+
+ /* If there is no pc running we're done (our interrupt took care of it) */
+ if (!scsi->pc) {
+ ret = SUCCESS;
+ goto ide_unlock;
+ }
+
+ /* It's somewhere in flight. Does ide subsystem agree? */
+ if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
+ elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
+ /*
+ * FIXME - not sure this condition can ever occur
+ */
+ printk (KERN_ERR "ide-scsi: cmd aborted!\n");
+
+ if (scsi->pc->rq->flags & REQ_SENSE)
+ kfree(scsi->pc->buffer);
+ kfree(scsi->pc->rq);
+ kfree(scsi->pc);
+ scsi->pc = NULL;
+
+ ret = SUCCESS;
+ }
+
+ide_unlock:
+ spin_unlock_irq(&ide_lock);
+no_drive:
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
+ printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
+
+ return ret;
+}
+
+static int idescsi_eh_reset (struct scsi_cmnd *cmd)
+{
+ struct request *req;
+ idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
+ ide_drive_t *drive = scsi->drive;
+ int ready = 0;
+ int ret = SUCCESS;
+
+ /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
+
+ if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
+ printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
+
+ if (!drive) {
+ printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
+ WARN_ON(1);
+ return FAILED;
+ }
+
+ spin_lock_irq(&ide_lock);
+
+ if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
+ printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
+ spin_unlock(&ide_lock);
+ return FAILED;
+ }
+
+ /* kill current request */
+ blkdev_dequeue_request(req);
+ end_that_request_last(req);
+ if (req->flags & REQ_SENSE)
+ kfree(scsi->pc->buffer);
+ kfree(scsi->pc);
+ scsi->pc = NULL;
+ kfree(req);
+
+ /* now nuke the drive queue */
+ while ((req = elv_next_request(drive->queue))) {
+ blkdev_dequeue_request(req);
+ end_that_request_last(req);
+ }
+
+ HWGROUP(drive)->rq = NULL;
+ HWGROUP(drive)->handler = NULL;
+ HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
+ spin_unlock_irq(&ide_lock);
+
+ ide_do_reset(drive);
+
+ /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
+
+ do {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ spin_unlock_irq(cmd->device->host->host_lock);
+ schedule_timeout(HZ/20);
+ spin_lock_irq(cmd->device->host->host_lock);
+ } while ( HWGROUP(drive)->handler );
+
+ ready = drive_is_ready(drive);
+ HWGROUP(drive)->busy--;
+ if (!ready) {
+ printk (KERN_ERR "ide-scsi: reset failed!\n");
+ ret = FAILED;
+ }
+
+ return ret;
+}
+
+static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
+ sector_t capacity, int *parm)
+{
+ idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
+ ide_drive_t *drive = idescsi->drive;
+
+ 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 struct scsi_host_template idescsi_template = {
+ .module = THIS_MODULE,
+ .name = "idescsi",
+ .info = idescsi_info,
+ .slave_configure = idescsi_slave_configure,
+ .ioctl = idescsi_ioctl,
+ .queuecommand = idescsi_queue,
+ .eh_abort_handler = idescsi_eh_abort,
+ .eh_host_reset_handler = idescsi_eh_reset,
+ .bios_param = idescsi_bios,
+ .can_queue = 40,
+ .this_id = -1,
+ .sg_tablesize = 256,
+ .cmd_per_lun = 5,
+ .max_sectors = 128,
+ .use_clustering = DISABLE_CLUSTERING,
+ .emulated = 1,
+ .proc_name = "ide-scsi",
+};
+
+static int idescsi_attach(ide_drive_t *drive)
+{
+ idescsi_scsi_t *idescsi;
+ struct Scsi_Host *host;
+ struct gendisk *g;
+ static int warned;
+ int err = -ENOMEM;
+
+ if (!warned && drive->media == ide_cdrom) {
+ printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
+ warned = 1;
+ }
+
+ if (!strstr("ide-scsi", drive->driver_req) ||
+ !drive->present ||
+ drive->media == ide_disk ||
+ !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
+ return 1;
+
+ g = alloc_disk(1 << PARTN_BITS);
+ if (!g)
+ goto out_host_put;
+
+ ide_init_disk(g, drive);
+
+ host->max_id = 1;
+
+#if IDESCSI_DEBUG_LOG
+ if (drive->id->last_lun)
+ printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
+#endif
+ if ((drive->id->last_lun & 0x7) != 7)
+ host->max_lun = (drive->id->last_lun & 0x7) + 1;
+ else
+ host->max_lun = 1;
+
+ drive->driver_data = host;
+ idescsi = scsihost_to_idescsi(host);
+ idescsi->drive = drive;
+ idescsi->driver = &idescsi_driver;
+ idescsi->host = host;
+ idescsi->disk = g;
+ g->private_data = &idescsi->driver;
+ err = ide_register_subdriver(drive, &idescsi_driver);
+ if (!err) {
+ idescsi_setup (drive, idescsi);
+ g->fops = &idescsi_ops;
+ ide_register_region(g);
+ err = scsi_add_host(host, &drive->gendev);
+ if (!err) {
+ scsi_scan_host(host);
+ return 0;
+ }
+ /* fall through on error */
+ ide_unregister_region(g);
+ ide_unregister_subdriver(drive);
+ }
+
+ put_disk(g);
+out_host_put:
+ scsi_host_put(host);
+ return err;
+}
+
+static int __init init_idescsi_module(void)
+{
+ return ide_register_driver(&idescsi_driver);
+}
+
+static void __exit exit_idescsi_module(void)
+{
+ ide_unregister_driver(&idescsi_driver);
+}
+
+module_init(init_idescsi_module);
+module_exit(exit_idescsi_module);
+MODULE_LICENSE("GPL");