![Bartlomiej Zolnierkiewicz](/assets/img/avatar_default.png)
* Add ide_pad_transfer() helper (which uses ->{in,out}put_data methods internally so the transfer is also padded to drive+host requirements) and use it instead of ide_atapi_{write_zeros,discard_data}(). * Remove no longer needed ide_atapi_{write_zeros,discard_data}(). Cc: Borislav Petkov <petkovbb@gmail.com> Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
1047 lines
28 KiB
C
1047 lines
28 KiB
C
/*
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* Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
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* Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
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*/
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/*
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* Emulation of a SCSI host adapter for IDE ATAPI devices.
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*
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* With this driver, one can use the Linux SCSI drivers instead of the
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* native IDE ATAPI drivers.
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*
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* Ver 0.1 Dec 3 96 Initial version.
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* Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation
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* of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
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* to Janos Farkas for pointing this out.
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* Avoid using bitfields in structures for m68k.
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* Added Scatter/Gather and DMA support.
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* Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives.
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* Use variable timeout for each command.
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* Ver 0.5 Jan 2 98 Fix previous PD/CD support.
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* Allow disabling of SCSI-6 to SCSI-10 transformation.
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* Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer
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* for access through /dev/sg.
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* Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
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* Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple
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* detection of devices with CONFIG_SCSI_MULTI_LUN
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* Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7.
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* Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM.
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* Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
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* Ver 0.92 Dec 31 02 Implement new SCSI mid level API
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*/
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#define IDESCSI_VERSION "0.92"
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/slab.h>
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#include <linux/ide.h>
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#include <linux/scatterlist.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/bitops.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/sg.h>
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#define IDESCSI_DEBUG_LOG 0
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/*
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* SCSI command transformation layer
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*/
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#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
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/*
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* Log flags
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*/
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#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
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typedef struct ide_scsi_obj {
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ide_drive_t *drive;
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ide_driver_t *driver;
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struct gendisk *disk;
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struct Scsi_Host *host;
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struct ide_atapi_pc *pc; /* Current packet command */
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unsigned long flags; /* Status/Action flags */
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unsigned long transform; /* SCSI cmd translation layer */
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unsigned long log; /* log flags */
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} idescsi_scsi_t;
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static DEFINE_MUTEX(idescsi_ref_mutex);
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/* Set by module param to skip cd */
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static int idescsi_nocd;
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#define ide_scsi_g(disk) \
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container_of((disk)->private_data, struct ide_scsi_obj, driver)
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static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
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{
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struct ide_scsi_obj *scsi = NULL;
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mutex_lock(&idescsi_ref_mutex);
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scsi = ide_scsi_g(disk);
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if (scsi)
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scsi_host_get(scsi->host);
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mutex_unlock(&idescsi_ref_mutex);
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return scsi;
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}
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static void ide_scsi_put(struct ide_scsi_obj *scsi)
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{
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mutex_lock(&idescsi_ref_mutex);
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scsi_host_put(scsi->host);
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mutex_unlock(&idescsi_ref_mutex);
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}
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static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
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{
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return (idescsi_scsi_t*) (&host[1]);
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}
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static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
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{
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return scsihost_to_idescsi(ide_drive->driver_data);
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}
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/*
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* Per ATAPI device status bits.
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*/
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#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
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/*
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* ide-scsi requests.
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*/
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#define IDESCSI_PC_RQ 90
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/*
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* PIO data transfer routines using the scatter gather table.
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*/
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static void idescsi_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
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unsigned int bcount)
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{
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ide_hwif_t *hwif = drive->hwif;
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int count;
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char *buf;
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while (bcount) {
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count = min(pc->sg->length - pc->b_count, bcount);
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if (PageHighMem(sg_page(pc->sg))) {
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unsigned long flags;
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local_irq_save(flags);
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buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
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pc->sg->offset;
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hwif->input_data(drive, NULL, buf + pc->b_count, count);
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kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
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local_irq_restore(flags);
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} else {
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buf = sg_virt(pc->sg);
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hwif->input_data(drive, NULL, buf + pc->b_count, count);
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}
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bcount -= count; pc->b_count += count;
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if (pc->b_count == pc->sg->length) {
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if (!--pc->sg_cnt)
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break;
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pc->sg = sg_next(pc->sg);
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pc->b_count = 0;
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}
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}
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if (bcount) {
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printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
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ide_pad_transfer(drive, 0, bcount);
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}
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}
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static void idescsi_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
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unsigned int bcount)
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{
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ide_hwif_t *hwif = drive->hwif;
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int count;
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char *buf;
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while (bcount) {
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count = min(pc->sg->length - pc->b_count, bcount);
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if (PageHighMem(sg_page(pc->sg))) {
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unsigned long flags;
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local_irq_save(flags);
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buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
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pc->sg->offset;
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hwif->output_data(drive, NULL, buf + pc->b_count, count);
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kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
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local_irq_restore(flags);
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} else {
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buf = sg_virt(pc->sg);
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hwif->output_data(drive, NULL, buf + pc->b_count, count);
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}
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bcount -= count; pc->b_count += count;
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if (pc->b_count == pc->sg->length) {
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if (!--pc->sg_cnt)
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break;
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pc->sg = sg_next(pc->sg);
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pc->b_count = 0;
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}
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}
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if (bcount) {
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printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
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ide_pad_transfer(drive, 1, bcount);
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}
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}
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static void ide_scsi_hex_dump(u8 *data, int len)
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{
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print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
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}
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static int idescsi_check_condition(ide_drive_t *drive,
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struct request *failed_cmd)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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struct ide_atapi_pc *pc;
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struct request *rq;
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u8 *buf;
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/* stuff a sense request in front of our current request */
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pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
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rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
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buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
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if (!pc || !rq || !buf) {
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kfree(buf);
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kfree(rq);
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kfree(pc);
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return -ENOMEM;
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}
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ide_init_drive_cmd(rq);
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rq->special = (char *) pc;
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pc->rq = rq;
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pc->buf = buf;
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pc->c[0] = REQUEST_SENSE;
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pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
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rq->cmd_type = REQ_TYPE_SENSE;
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pc->timeout = jiffies + WAIT_READY;
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/* NOTE! Save the failed packet command in "rq->buffer" */
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rq->buffer = (void *) failed_cmd->special;
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pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
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if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
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printk ("ide-scsi: %s: queue cmd = ", drive->name);
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ide_scsi_hex_dump(pc->c, 6);
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}
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rq->rq_disk = scsi->disk;
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return ide_do_drive_cmd(drive, rq, ide_preempt);
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}
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static int idescsi_end_request(ide_drive_t *, int, int);
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static ide_startstop_t
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idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
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{
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ide_hwif_t *hwif = drive->hwif;
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if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
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/* force an abort */
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hwif->OUTBSYNC(drive, WIN_IDLEIMMEDIATE,
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hwif->io_ports.command_addr);
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rq->errors++;
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idescsi_end_request(drive, 0, 0);
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return ide_stopped;
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}
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static ide_startstop_t
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idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
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{
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#if IDESCSI_DEBUG_LOG
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printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
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((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
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#endif
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rq->errors |= ERROR_MAX;
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idescsi_end_request(drive, 0, 0);
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return ide_stopped;
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}
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static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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struct request *rq = HWGROUP(drive)->rq;
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struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
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int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
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struct Scsi_Host *host;
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int errors = rq->errors;
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unsigned long flags;
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if (!blk_special_request(rq) && !blk_sense_request(rq)) {
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ide_end_request(drive, uptodate, nrsecs);
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return 0;
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}
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ide_end_drive_cmd (drive, 0, 0);
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if (blk_sense_request(rq)) {
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struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
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if (log) {
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printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
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ide_scsi_hex_dump(pc->buf, 16);
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}
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memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
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SCSI_SENSE_BUFFERSIZE);
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kfree(pc->buf);
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kfree(pc);
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kfree(rq);
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pc = opc;
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rq = pc->rq;
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pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
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(((pc->flags & PC_FLAG_TIMEDOUT) ?
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DID_TIME_OUT :
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DID_OK) << 16);
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} else if (pc->flags & PC_FLAG_TIMEDOUT) {
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if (log)
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printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
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drive->name, pc->scsi_cmd->serial_number);
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pc->scsi_cmd->result = DID_TIME_OUT << 16;
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} else if (errors >= ERROR_MAX) {
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pc->scsi_cmd->result = DID_ERROR << 16;
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if (log)
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printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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} else if (errors) {
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if (log)
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printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
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if (!idescsi_check_condition(drive, rq))
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/* we started a request sense, so we'll be back, exit for now */
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return 0;
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pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
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} else {
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pc->scsi_cmd->result = DID_OK << 16;
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}
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host = pc->scsi_cmd->device->host;
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spin_lock_irqsave(host->host_lock, flags);
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pc->done(pc->scsi_cmd);
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spin_unlock_irqrestore(host->host_lock, flags);
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kfree(pc);
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kfree(rq);
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scsi->pc = NULL;
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return 0;
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}
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static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
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{
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return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
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}
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static int idescsi_expiry(ide_drive_t *drive)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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struct ide_atapi_pc *pc = scsi->pc;
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#if IDESCSI_DEBUG_LOG
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printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
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#endif
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pc->flags |= PC_FLAG_TIMEDOUT;
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return 0; /* we do not want the ide subsystem to retry */
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}
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/*
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* Our interrupt handler.
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*/
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static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
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{
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idescsi_scsi_t *scsi = drive_to_idescsi(drive);
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ide_hwif_t *hwif = drive->hwif;
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struct ide_atapi_pc *pc = scsi->pc;
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struct request *rq = pc->rq;
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unsigned int temp;
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u16 bcount;
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u8 stat, ireason;
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#if IDESCSI_DEBUG_LOG
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printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
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#endif /* IDESCSI_DEBUG_LOG */
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if (pc->flags & PC_FLAG_TIMEDOUT) {
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#if IDESCSI_DEBUG_LOG
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printk(KERN_WARNING "idescsi_pc_intr: got timed out packet %lu at %lu\n",
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pc->scsi_cmd->serial_number, jiffies);
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#endif
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/* end this request now - scsi should retry it*/
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idescsi_end_request (drive, 1, 0);
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return ide_stopped;
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}
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if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
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pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
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#if IDESCSI_DEBUG_LOG
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printk ("ide-scsi: %s: DMA complete\n", drive->name);
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#endif /* IDESCSI_DEBUG_LOG */
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pc->xferred = pc->req_xfer;
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(void)hwif->dma_ops->dma_end(drive);
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}
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/* Clear the interrupt */
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stat = ide_read_status(drive);
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if ((stat & DRQ_STAT) == 0) {
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/* No more interrupts */
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if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
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printk(KERN_INFO "Packet command completed, %d bytes"
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" transferred\n", pc->xferred);
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local_irq_enable_in_hardirq();
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if (stat & ERR_STAT)
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rq->errors++;
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idescsi_end_request (drive, 1, 0);
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return ide_stopped;
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}
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bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
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hwif->INB(hwif->io_ports.lbam_addr);
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ireason = hwif->INB(hwif->io_ports.nsect_addr);
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if (ireason & CD) {
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printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
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return ide_do_reset (drive);
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}
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if (ireason & IO) {
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temp = pc->xferred + bcount;
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if (temp > pc->req_xfer) {
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if (temp > pc->buf_size) {
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printk(KERN_ERR "ide-scsi: The scsi wants to "
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"send us more data than expected "
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"- discarding data\n");
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temp = pc->buf_size - pc->xferred;
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if (temp) {
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pc->flags &= ~PC_FLAG_WRITING;
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if (pc->sg)
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idescsi_input_buffers(drive, pc,
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temp);
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else
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hwif->input_data(drive, NULL,
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pc->cur_pos, temp);
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printk(KERN_ERR "ide-scsi: transferred"
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" %d of %d bytes\n",
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temp, bcount);
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}
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pc->xferred += temp;
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pc->cur_pos += temp;
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ide_pad_transfer(drive, 0, bcount - temp);
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ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
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return ide_started;
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}
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#if IDESCSI_DEBUG_LOG
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printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
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#endif /* IDESCSI_DEBUG_LOG */
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}
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}
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if (ireason & IO) {
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pc->flags &= ~PC_FLAG_WRITING;
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if (pc->sg)
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idescsi_input_buffers(drive, pc, bcount);
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else
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hwif->input_data(drive, NULL, pc->cur_pos, bcount);
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} else {
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pc->flags |= PC_FLAG_WRITING;
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if (pc->sg)
|
|
idescsi_output_buffers(drive, pc, bcount);
|
|
else
|
|
hwif->output_data(drive, NULL, pc->cur_pos, bcount);
|
|
}
|
|
/* Update the current position */
|
|
pc->xferred += bcount;
|
|
pc->cur_pos += bcount;
|
|
|
|
/* 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);
|
|
struct ide_atapi_pc *pc = scsi->pc;
|
|
ide_startstop_t startstop;
|
|
u8 ireason;
|
|
|
|
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 = hwif->INB(hwif->io_ports.nsect_addr);
|
|
if ((ireason & CD) == 0 || (ireason & IO)) {
|
|
printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
|
|
"issuing a packet command\n");
|
|
return ide_do_reset (drive);
|
|
}
|
|
BUG_ON(HWGROUP(drive)->handler != NULL);
|
|
/* Set the interrupt routine */
|
|
ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
|
|
|
|
/* Send the actual packet */
|
|
hwif->output_data(drive, NULL, scsi->pc->c, 12);
|
|
|
|
if (pc->flags & PC_FLAG_DMA_OK) {
|
|
pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
|
|
hwif->dma_ops->dma_start(drive);
|
|
}
|
|
return ide_started;
|
|
}
|
|
|
|
static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
|
|
{
|
|
switch (pc->c[0]) {
|
|
case READ_6: case READ_10: case READ_12:
|
|
pc->flags &= ~PC_FLAG_WRITING;
|
|
return 0;
|
|
case WRITE_6: case WRITE_10: case WRITE_12:
|
|
pc->flags |= PC_FLAG_WRITING;
|
|
return 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
struct scatterlist *sg, *scsi_sg;
|
|
int segments;
|
|
|
|
if (!pc->req_xfer || pc->req_xfer % 1024)
|
|
return 1;
|
|
|
|
if (idescsi_set_direction(pc))
|
|
return 1;
|
|
|
|
sg = hwif->sg_table;
|
|
scsi_sg = scsi_sglist(pc->scsi_cmd);
|
|
segments = scsi_sg_count(pc->scsi_cmd);
|
|
|
|
if (segments > hwif->sg_max_nents)
|
|
return 1;
|
|
|
|
hwif->sg_nents = segments;
|
|
memcpy(sg, scsi_sg, sizeof(*sg) * segments);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
|
|
struct ide_atapi_pc *pc)
|
|
{
|
|
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
u16 bcount;
|
|
u8 dma = 0;
|
|
|
|
/* Set the current packet command */
|
|
scsi->pc = pc;
|
|
/* We haven't transferred any data yet */
|
|
pc->xferred = 0;
|
|
pc->cur_pos = pc->buf;
|
|
/* Request to transfer the entire buffer at once */
|
|
bcount = min(pc->req_xfer, 63 * 1024);
|
|
|
|
if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
|
|
hwif->sg_mapped = 1;
|
|
dma = !hwif->dma_ops->dma_setup(drive);
|
|
hwif->sg_mapped = 0;
|
|
}
|
|
|
|
ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK, bcount, dma);
|
|
|
|
if (dma)
|
|
pc->flags |= PC_FLAG_DMA_OK;
|
|
|
|
if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
|
|
ide_execute_command(drive, WIN_PACKETCMD, &idescsi_transfer_pc,
|
|
get_timeout(pc), idescsi_expiry);
|
|
return ide_started;
|
|
} else {
|
|
/* Issue the packet command */
|
|
ide_execute_pkt_cmd(drive);
|
|
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 "dev: %s, cmd: %x, errors: %d\n", 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 (blk_sense_request(rq) || blk_special_request(rq)) {
|
|
return idescsi_issue_pc(drive,
|
|
(struct ide_atapi_pc *) rq->special);
|
|
}
|
|
blk_dump_rq_flags(rq, "ide-scsi: unsup command");
|
|
idescsi_end_request (drive, 0, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
#ifdef CONFIG_IDE_PROC_FS
|
|
static void idescsi_add_settings(ide_drive_t *drive)
|
|
{
|
|
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
|
|
|
|
/*
|
|
* drive setting name read/write data type min max mul_factor div_factor data pointer set function
|
|
*/
|
|
ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
|
|
ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
|
|
ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
|
|
ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
|
|
ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
|
|
}
|
|
#else
|
|
static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
|
|
#endif
|
|
|
|
/*
|
|
* Driver initialization.
|
|
*/
|
|
static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
|
|
{
|
|
if (drive->id && (drive->id->config & 0x0060) == 0x20)
|
|
set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
|
|
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);
|
|
}
|
|
|
|
static void ide_scsi_remove(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;
|
|
|
|
scsi_remove_host(scsihost);
|
|
ide_proc_unregister_driver(drive, scsi->driver);
|
|
|
|
ide_unregister_region(g);
|
|
|
|
drive->driver_data = NULL;
|
|
g->private_data = NULL;
|
|
put_disk(g);
|
|
|
|
ide_scsi_put(scsi);
|
|
}
|
|
|
|
static int ide_scsi_probe(ide_drive_t *);
|
|
|
|
#ifdef CONFIG_IDE_PROC_FS
|
|
static ide_proc_entry_t idescsi_proc[] = {
|
|
{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
|
|
{ NULL, 0, NULL, NULL }
|
|
};
|
|
#endif
|
|
|
|
static ide_driver_t idescsi_driver = {
|
|
.gen_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ide-scsi",
|
|
.bus = &ide_bus_type,
|
|
},
|
|
.probe = ide_scsi_probe,
|
|
.remove = ide_scsi_remove,
|
|
.version = IDESCSI_VERSION,
|
|
.media = ide_scsi,
|
|
.supports_dsc_overlap = 0,
|
|
.do_request = idescsi_do_request,
|
|
.end_request = idescsi_end_request,
|
|
.error = idescsi_atapi_error,
|
|
.abort = idescsi_atapi_abort,
|
|
#ifdef CONFIG_IDE_PROC_FS
|
|
.proc = idescsi_proc,
|
|
#endif
|
|
};
|
|
|
|
static int idescsi_ide_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ide_scsi_obj *scsi;
|
|
|
|
if (!(scsi = ide_scsi_get(disk)))
|
|
return -ENXIO;
|
|
|
|
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_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_slave_configure(struct scsi_device * sdp)
|
|
{
|
|
/* Configure detected device */
|
|
sdp->use_10_for_rw = 1;
|
|
sdp->use_10_for_ms = 1;
|
|
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 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;
|
|
struct ide_atapi_pc *pc = NULL;
|
|
|
|
if (!drive) {
|
|
scmd_printk (KERN_ERR, cmd, "drive not present\n");
|
|
goto abort;
|
|
}
|
|
scsi = drive_to_idescsi(drive);
|
|
pc = kmalloc(sizeof(struct ide_atapi_pc), 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);
|
|
pc->buf = NULL;
|
|
pc->sg = scsi_sglist(cmd);
|
|
pc->sg_cnt = scsi_sg_count(cmd);
|
|
pc->b_count = 0;
|
|
pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
|
|
pc->scsi_cmd = cmd;
|
|
pc->done = done;
|
|
pc->timeout = jiffies + cmd->timeout_per_command;
|
|
|
|
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
|
|
printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
|
|
ide_scsi_hex_dump(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);
|
|
ide_scsi_hex_dump(pc->c, 12);
|
|
}
|
|
}
|
|
|
|
ide_init_drive_cmd (rq);
|
|
rq->special = (char *) pc;
|
|
rq->cmd_type = REQ_TYPE_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:
|
|
kfree (pc);
|
|
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 (blk_sense_request(scsi->pc->rq))
|
|
kfree(scsi->pc->buf);
|
|
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(cmd->device->host->host_lock);
|
|
spin_lock(&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);
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
return FAILED;
|
|
}
|
|
|
|
/* kill current request */
|
|
if (__blk_end_request(req, -EIO, 0))
|
|
BUG();
|
|
if (blk_sense_request(req))
|
|
kfree(scsi->pc->buf);
|
|
kfree(scsi->pc);
|
|
scsi->pc = NULL;
|
|
kfree(req);
|
|
|
|
/* now nuke the drive queue */
|
|
while ((req = elv_next_request(drive->queue))) {
|
|
if (__blk_end_request(req, -EIO, 0))
|
|
BUG();
|
|
}
|
|
|
|
HWGROUP(drive)->rq = NULL;
|
|
HWGROUP(drive)->handler = NULL;
|
|
HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
|
|
spin_unlock(&ide_lock);
|
|
|
|
ide_do_reset(drive);
|
|
|
|
/* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
|
|
|
|
do {
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
msleep(50);
|
|
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;
|
|
}
|
|
|
|
spin_unlock_irq(cmd->device->host->host_lock);
|
|
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 ide_scsi_probe(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 (idescsi_nocd && drive->media == ide_cdrom)
|
|
return -ENODEV;
|
|
|
|
if (!strstr("ide-scsi", drive->driver_req) ||
|
|
!drive->present ||
|
|
drive->media == ide_disk ||
|
|
!(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
|
|
return -ENODEV;
|
|
|
|
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;
|
|
ide_proc_register_driver(drive, &idescsi_driver);
|
|
err = 0;
|
|
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_proc_unregister_driver(drive, &idescsi_driver);
|
|
|
|
put_disk(g);
|
|
out_host_put:
|
|
scsi_host_put(host);
|
|
return err;
|
|
}
|
|
|
|
static int __init init_idescsi_module(void)
|
|
{
|
|
return driver_register(&idescsi_driver.gen_driver);
|
|
}
|
|
|
|
static void __exit exit_idescsi_module(void)
|
|
{
|
|
driver_unregister(&idescsi_driver.gen_driver);
|
|
}
|
|
|
|
module_param(idescsi_nocd, int, 0600);
|
|
MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
|
|
module_init(init_idescsi_module);
|
|
module_exit(exit_idescsi_module);
|
|
MODULE_LICENSE("GPL");
|