aic79xx_osm.c

h内核

		 * the free directly, but check our
		 * list for extra sanity.
		 */
		ahd = ahd_find_softc(*(struct ahd_softc **)host->hostdata);
		if (ahd != NULL) {
			u_long s;

			ahd_lock(ahd, &s);
			ahd_intr_enable(ahd, FALSE);
			ahd_unlock(ahd, &s);
			ahd_free(ahd);
		}
	}
	ahd_list_unlock(&l);
	return (0);
}
#endif

/*
 * Return a string describing the driver.
 */
static const char *
ahd_linux_info(struct Scsi_Host *host)
{
	static char buffer[512];
	char	ahd_info[256];
	char   *bp;
	struct ahd_softc *ahd;

	bp = &buffer[0];
	ahd = *(struct ahd_softc **)host->hostdata;
	memset(bp, 0, sizeof(buffer));
	strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
	strcat(bp, AIC79XX_DRIVER_VERSION);
	strcat(bp, "\n");
	strcat(bp, "        <");
	strcat(bp, ahd->description);
	strcat(bp, ">\n");
	strcat(bp, "        ");
	ahd_controller_info(ahd, ahd_info);
	strcat(bp, ahd_info);
	strcat(bp, "\n");

	return (bp);
}

/*
 * Queue an SCB to the controller.
 */
static int
ahd_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
{
	struct	 ahd_softc *ahd;
	struct	 ahd_linux_device *dev;
	u_long	 flags;

	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;

	/*
	 * Save the callback on completion function.
	 */
	cmd->scsi_done = scsi_done;

	ahd_midlayer_entrypoint_lock(ahd, &flags);

	/*
	 * Close the race of a command that was in the process of
	 * being queued to us just as our simq was frozen.  Let
	 * DV commands through so long as we are only frozen to
	 * perform DV.
	 */
	if (ahd->platform_data->qfrozen != 0
	 && AHD_DV_CMD(cmd) == 0) {

		ahd_cmd_set_transaction_status(cmd, CAM_REQUEUE_REQ);
		ahd_linux_queue_cmd_complete(ahd, cmd);
		ahd_schedule_completeq(ahd);
		ahd_midlayer_entrypoint_unlock(ahd, &flags);
		return (0);
	}
	dev = ahd_linux_get_device(ahd, cmd->device->channel,
				   cmd->device->id, cmd->device->lun,
				   /*alloc*/TRUE);
	if (dev == NULL) {
		ahd_cmd_set_transaction_status(cmd, CAM_RESRC_UNAVAIL);
		ahd_linux_queue_cmd_complete(ahd, cmd);
		ahd_schedule_completeq(ahd);
		ahd_midlayer_entrypoint_unlock(ahd, &flags);
		printf("%s: aic79xx_linux_queue - Unable to allocate device!\n",
		       ahd_name(ahd));
		return (0);
	}
	if (cmd->cmd_len > MAX_CDB_LEN)
		return (-EINVAL);
	cmd->result = CAM_REQ_INPROG << 16;
	TAILQ_INSERT_TAIL(&dev->busyq, (struct ahd_cmd *)cmd, acmd_links.tqe);
	if ((dev->flags & AHD_DEV_ON_RUN_LIST) == 0) {
		TAILQ_INSERT_TAIL(&ahd->platform_data->device_runq, dev, links);
		dev->flags |= AHD_DEV_ON_RUN_LIST;
		ahd_linux_run_device_queues(ahd);
	}
	ahd_midlayer_entrypoint_unlock(ahd, &flags);
	return (0);
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
static int
ahd_linux_slave_alloc(Scsi_Device *device)
{
	struct	ahd_softc *ahd;

	ahd = *((struct ahd_softc **)device->host->hostdata);
	if (bootverbose)
		printf("%s: Slave Alloc %d\n", ahd_name(ahd), device->id);
	return (0);
}

static int
ahd_linux_slave_configure(Scsi_Device *device)
{
	struct	ahd_softc *ahd;
	struct	ahd_linux_device *dev;
	u_long	flags;

	ahd = *((struct ahd_softc **)device->host->hostdata);
	if (bootverbose)
		printf("%s: Slave Configure %d\n", ahd_name(ahd), device->id);
	ahd_midlayer_entrypoint_lock(ahd, &flags);
	/*
	 * Since Linux has attached to the device, configure
	 * it so we don't free and allocate the device
	 * structure on every command.
	 */
	dev = ahd_linux_get_device(ahd, device->channel,
				   device->id, device->lun,
				   /*alloc*/TRUE);
	if (dev != NULL) {
		dev->flags &= ~AHD_DEV_UNCONFIGURED;
		dev->flags |= AHD_DEV_SLAVE_CONFIGURED;
		dev->scsi_device = device;
		ahd_linux_device_queue_depth(ahd, dev);
	}
	ahd_midlayer_entrypoint_unlock(ahd, &flags);
	return (0);
}

static void
ahd_linux_slave_destroy(Scsi_Device *device)
{
	struct	ahd_softc *ahd;
	struct	ahd_linux_device *dev;
	u_long	flags;

	ahd = *((struct ahd_softc **)device->host->hostdata);
	if (bootverbose)
		printf("%s: Slave Destroy %d\n", ahd_name(ahd), device->id);
	ahd_midlayer_entrypoint_lock(ahd, &flags);
	dev = ahd_linux_get_device(ahd, device->channel,
				   device->id, device->lun,
					   /*alloc*/FALSE);

	/*
	 * Filter out "silly" deletions of real devices by only
	 * deleting devices that have had slave_configure()
	 * called on them.  All other devices that have not
	 * been configured will automatically be deleted by
	 * the refcounting process.
	 */
	if (dev != NULL
	 && (dev->flags & AHD_DEV_SLAVE_CONFIGURED) != 0) {
		dev->flags |= AHD_DEV_UNCONFIGURED;
		if (TAILQ_EMPTY(&dev->busyq)
		 && dev->active == 0
		 && (dev->flags & AHD_DEV_TIMER_ACTIVE) == 0)
			ahd_linux_free_device(ahd, dev);
	}
	ahd_midlayer_entrypoint_unlock(ahd, &flags);
}
#else
/*
 * Sets the queue depth for each SCSI device hanging
 * off the input host adapter.
 */
static void
ahd_linux_select_queue_depth(struct Scsi_Host * host,
			     Scsi_Device * scsi_devs)
{
	Scsi_Device *device;
	Scsi_Device *ldev;
	struct	ahd_softc *ahd;
	u_long	flags;

	ahd = *((struct ahd_softc **)host->hostdata);
	ahd_lock(ahd, &flags);
	for (device = scsi_devs; device != NULL; device = device->next) {

		/*
		 * Watch out for duplicate devices.  This works around
		 * some quirks in how the SCSI scanning code does its
		 * device management.
		 */
		for (ldev = scsi_devs; ldev != device; ldev = ldev->next) {
			if (ldev->host == device->host
			 && ldev->channel == device->channel
			 && ldev->id == device->id
			 && ldev->lun == device->lun)
				break;
		}
		/* Skip duplicate. */
		if (ldev != device)
			continue;

		if (device->host == host) {
			struct	 ahd_linux_device *dev;

			/*
			 * Since Linux has attached to the device, configure
			 * it so we don't free and allocate the device
			 * structure on every command.
			 */
			dev = ahd_linux_get_device(ahd, device->channel,
						   device->id, device->lun,
						   /*alloc*/TRUE);
			if (dev != NULL) {
				dev->flags &= ~AHD_DEV_UNCONFIGURED;
				dev->scsi_device = device;
				ahd_linux_device_queue_depth(ahd, dev);
				device->queue_depth = dev->openings
						    + dev->active;
				if ((dev->flags & (AHD_DEV_Q_BASIC
						| AHD_DEV_Q_TAGGED)) == 0) {
					/*
					 * We allow the OS to queue 2 untagged
					 * transactions to us at any time even
					 * though we can only execute them
					 * serially on the controller/device.
					 * This should remove some latency.
					 */
					device->queue_depth = 2;
				}
			}
		}
	}
	ahd_unlock(ahd, &flags);
}
#endif

#if defined(__i386__)
/*
 * Return the disk geometry for the given SCSI device.
 */
static int
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
		    sector_t capacity, int geom[])
{
	uint8_t *bh;
#else
ahd_linux_biosparam(Disk *disk, kdev_t dev, int geom[])
{
	struct	scsi_device *sdev = disk->device;
	u_long	capacity = disk->capacity;
	struct	buffer_head *bh;
#endif
	int	 heads;
	int	 sectors;
	int	 cylinders;
	int	 ret;
	int	 extended;
	struct	 ahd_softc *ahd;

	ahd = *((struct ahd_softc **)sdev->host->hostdata);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
	bh = scsi_bios_ptable(bdev);
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,17)
	bh = bread(MKDEV(MAJOR(dev), MINOR(dev) & ~0xf), 0, block_size(dev));
#else
	bh = bread(MKDEV(MAJOR(dev), MINOR(dev) & ~0xf), 0, 1024);
#endif

	if (bh) {
		ret = scsi_partsize(bh, capacity,
				    &geom[2], &geom[0], &geom[1]);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
		kfree(bh);
#else
		brelse(bh);
#endif
		if (ret != -1)
			return (ret);
	}
	heads = 64;
	sectors = 32;
	cylinders = aic_sector_div(capacity, heads, sectors);

	if (aic79xx_extended != 0)
		extended = 1;
	else
		extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
	if (extended && cylinders >= 1024) {
		heads = 255;
		sectors = 63;
		cylinders = aic_sector_div(capacity, heads, sectors);
	}
	geom[0] = heads;
	geom[1] = sectors;
	geom[2] = cylinders;
	return (0);
}
#endif

/*
 * Abort the current SCSI command(s).
 */
static int
ahd_linux_abort(Scsi_Cmnd *cmd)
{
	struct ahd_softc *ahd;
	struct ahd_cmd *acmd;
	struct ahd_cmd *list_acmd;
	struct ahd_linux_device *dev;
	struct scb *pending_scb;
	u_long s;
	u_int  saved_scbptr;
	u_int  active_scbptr;
	u_int  last_phase;
	u_int  cdb_byte;
	int    retval;
	int    was_paused;
	int    paused;
	int    wait;
	int    disconnected;
	ahd_mode_state saved_modes;

	pending_scb = NULL;
	paused = FALSE;
	wait = FALSE;
	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
	acmd = (struct ahd_cmd *)cmd;

	printf("%s:%d:%d:%d: Attempting to abort cmd %p:",
	       ahd_name(ahd), cmd->device->channel, cmd->device->id,
	       cmd->device->lun, cmd);
	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
		printf(" 0x%x", cmd->cmnd[cdb_byte]);
	printf("\n");

	/*
	 * In all versions of Linux, we have to work around
	 * a major flaw in how the mid-layer is locked down
	 * if we are to sleep successfully in our error handler
	 * while allowing our interrupt handler to run.  Since
	 * the midlayer acquires either the io_request_lock or
	 * our lock prior to calling us, we must use the
	 * spin_unlock_irq() method for unlocking our lock.
	 * This will force interrupts to be enabled on the
	 * current CPU.  Since the EH thread should not have
	 * been running with CPU interrupts disabled other than
	 * by acquiring either the io_request_lock or our own
	 * lock, this *should* be safe.
	 */
	ahd_midlayer_entrypoint_lock(ahd, &s);

	/*
	 * First determine if we currently own this command.
	 * Start by searching the device queue.  If not found
	 * there, check the pending_scb list.  If not found
	 * at all, and the system wanted us to just abort the
	 * command, return success.
	 */
	dev = ahd_linux_get_device(ahd, cmd->device->channel,
				   cmd->device->id, cmd->device->lun,
				   /*alloc*/FALSE);

	if (dev == NULL) {
		/*
		 * No target device for this command exists,
		 * so we must not still own the command.
		 */
		printf("%s:%d:%d:%d: Is not an active device\n",
		       ahd_name(ahd), cmd->device->channel, cmd->device->id,
		       cmd->device->lun);
		retval = SUCCESS;
		goto no_cmd;
	}

	TAILQ_FOREACH(list_acmd, &dev->busyq, acmd_links.tqe) {
		if (list_acmd == acmd)
			break;
	}

	if (list_acmd != NULL) {
		printf("%s:%d:%d:%d: Command found on device queue\n",
		       ahd_name(ahd), cmd->device->channel, cmd->device->id,
		       cmd->device->lun);
		TAILQ_REMOVE(&dev->busyq, list_acmd, acmd_links.tqe);
		cmd->result = DID_ABORT << 16;
		ahd_linux_queue_cmd_complete(ahd, cmd);
		retval = SUCCESS;
		goto done;
	}

	/*
	 * See if we can find a matching cmd in the pending list.
	 */
	LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
		if (pending_scb->io_ctx == cmd)
			break;
	}

	if (pending_scb == NULL) {
		printf("%s:%d:%d:%d: Command not found\n",
		       ahd_name(ahd), cmd->device->channel, cmd->device->id,
		       cmd->device->lun);
		goto no_cmd;
	}

	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
		/*
		 * We can't queue two recovery actions using the same SCB
		 */
		retval = FAILED;
		goto  done;
	}

	/*
	 * Ensure that the card doesn't do anything
	 * behind our back.  Also make sure that we
	 * didn't "just" miss an interrupt that would
	 * affect this cmd.
	 */
	was_paused = ahd_is_paused(ahd);
	ahd_pause_and_flushwork(ahd);
	paused = TRUE;

	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
		printf("%s:%d:%d:%d: Command already completed\n",
		       ahd_name(ahd), cmd->device->channel, cmd->device->id,
		       cmd->device->lun);