aic7xxx_osm.c

优龙2410linux2.6.8内核源代码

	/*
	 * Initialize our softc list lock prior to
	 * probing for any adapters.
	 */
	ahc_list_lockinit();

	found = ahc_linux_pci_init();
	if (!ahc_linux_eisa_init())
		found++;
	
	/*
	 * Register with the SCSI layer all
	 * controllers we've found.
	 */
	TAILQ_FOREACH(ahc, &ahc_tailq, links) {

		if (ahc_linux_register_host(ahc, template) == 0)
			found++;
	}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	spin_lock_irq(&io_request_lock);
#endif
	aic7xxx_detect_complete++;

	return (found);
}

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
/*
 * Free the passed in Scsi_Host memory structures prior to unloading the
 * module.
 */
int
ahc_linux_release(struct Scsi_Host * host)
{
	struct ahc_softc *ahc;
	u_long l;

	ahc_list_lock(&l);
	if (host != NULL) {

		/*
		 * We should be able to just perform
		 * the free directly, but check our
		 * list for extra sanity.
		 */
		ahc = ahc_find_softc(*(struct ahc_softc **)host->hostdata);
		if (ahc != NULL) {
			u_long s;

			ahc_lock(ahc, &s);
			ahc_intr_enable(ahc, FALSE);
			ahc_unlock(ahc, &s);
			ahc_free(ahc);
		}
	}
	ahc_list_unlock(&l);
	return (0);
}
#endif

/*
 * Return a string describing the driver.
 */
static const char *
ahc_linux_info(struct Scsi_Host *host)
{
	static char buffer[512];
	char	ahc_info[256];
	char   *bp;
	struct ahc_softc *ahc;

	bp = &buffer[0];
	ahc = *(struct ahc_softc **)host->hostdata;
	memset(bp, 0, sizeof(buffer));
	strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
	strcat(bp, AIC7XXX_DRIVER_VERSION);
	strcat(bp, "\n");
	strcat(bp, "        <");
	strcat(bp, ahc->description);
	strcat(bp, ">\n");
	strcat(bp, "        ");
	ahc_controller_info(ahc, ahc_info);
	strcat(bp, ahc_info);
	strcat(bp, "\n");

	return (bp);
}

/*
 * Queue an SCB to the controller.
 */
static int
ahc_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *))
{
	struct	 ahc_softc *ahc;
	struct	 ahc_linux_device *dev;
	u_long	 flags;

	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;

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

	ahc_midlayer_entrypoint_lock(ahc, &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 (ahc->platform_data->qfrozen != 0
	 && AHC_DV_CMD(cmd) == 0) {

		ahc_cmd_set_transaction_status(cmd, CAM_REQUEUE_REQ);
		ahc_linux_queue_cmd_complete(ahc, cmd);
		ahc_schedule_completeq(ahc);
		ahc_midlayer_entrypoint_unlock(ahc, &flags);
		return (0);
	}
	dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id,
				   cmd->device->lun, /*alloc*/TRUE);
	if (dev == NULL) {
		ahc_cmd_set_transaction_status(cmd, CAM_RESRC_UNAVAIL);
		ahc_linux_queue_cmd_complete(ahc, cmd);
		ahc_schedule_completeq(ahc);
		ahc_midlayer_entrypoint_unlock(ahc, &flags);
		printf("%s: aic7xxx_linux_queue - Unable to allocate device!\n",
		       ahc_name(ahc));
		return (0);
	}
	cmd->result = CAM_REQ_INPROG << 16;
	TAILQ_INSERT_TAIL(&dev->busyq, (struct ahc_cmd *)cmd, acmd_links.tqe);
	if ((dev->flags & AHC_DEV_ON_RUN_LIST) == 0) {
		TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, dev, links);
		dev->flags |= AHC_DEV_ON_RUN_LIST;
		ahc_linux_run_device_queues(ahc);
	}
	ahc_midlayer_entrypoint_unlock(ahc, &flags);
	return (0);
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
static int
ahc_linux_slave_alloc(Scsi_Device *device)
{
	struct	ahc_softc *ahc;

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

static int
ahc_linux_slave_configure(Scsi_Device *device)
{
	struct	ahc_softc *ahc;
	struct	ahc_linux_device *dev;
	u_long	flags;

	ahc = *((struct ahc_softc **)device->host->hostdata);
	if (bootverbose)
		printf("%s: Slave Configure %d\n", ahc_name(ahc), device->id);
	ahc_midlayer_entrypoint_lock(ahc, &flags);
	/*
	 * Since Linux has attached to the device, configure
	 * it so we don't free and allocate the device
	 * structure on every command.
	 */
	dev = ahc_linux_get_device(ahc, device->channel,
				   device->id, device->lun,
				   /*alloc*/TRUE);
	if (dev != NULL) {
		dev->flags &= ~AHC_DEV_UNCONFIGURED;
		dev->scsi_device = device;
		ahc_linux_device_queue_depth(ahc, dev);
	}
	ahc_midlayer_entrypoint_unlock(ahc, &flags);
	return (0);
}

static void
ahc_linux_slave_destroy(Scsi_Device *device)
{
	struct	ahc_softc *ahc;
	struct	ahc_linux_device *dev;
	u_long	flags;

	ahc = *((struct ahc_softc **)device->host->hostdata);
	if (bootverbose)
		printf("%s: Slave Destroy %d\n", ahc_name(ahc), device->id);
	ahc_midlayer_entrypoint_lock(ahc, &flags);
	dev = ahc_linux_get_device(ahc, 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 & AHC_DEV_SLAVE_CONFIGURED) != 0) {
		dev->flags |= AHC_DEV_UNCONFIGURED;
		if (TAILQ_EMPTY(&dev->busyq)
		 && dev->active == 0
	 	 && (dev->flags & AHC_DEV_TIMER_ACTIVE) == 0)
			ahc_linux_free_device(ahc, dev);
	}
	ahc_midlayer_entrypoint_unlock(ahc, &flags);
}
#else
/*
 * Sets the queue depth for each SCSI device hanging
 * off the input host adapter.
 */
static void
ahc_linux_select_queue_depth(struct Scsi_Host *host, Scsi_Device *scsi_devs)
{
	Scsi_Device *device;
	Scsi_Device *ldev;
	struct	ahc_softc *ahc;
	u_long	flags;

	ahc = *((struct ahc_softc **)host->hostdata);
	ahc_lock(ahc, &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	 ahc_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 = ahc_linux_get_device(ahc, device->channel,
						   device->id, device->lun,
						   /*alloc*/TRUE);
			if (dev != NULL) {
				dev->flags &= ~AHC_DEV_UNCONFIGURED;
				dev->scsi_device = device;
				ahc_linux_device_queue_depth(ahc, dev);
				device->queue_depth = dev->openings
						    + dev->active;
				if ((dev->flags & (AHC_DEV_Q_BASIC
						| AHC_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;
				}
			}
		}
	}
	ahc_unlock(ahc, &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)
ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
		    sector_t capacity, int geom[])
{
	uint8_t *bh;
#else
ahc_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	 ahc_softc *ahc;
	u_int	 channel;

	ahc = *((struct ahc_softc **)sdev->host->hostdata);
	channel = sdev->channel;

#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 (aic7xxx_extended != 0)
		extended = 1;
	else if (channel == 0)
		extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
	else
		extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 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
ahc_linux_abort(Scsi_Cmnd *cmd)
{
	int error;

	error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
	if (error != 0)
		printf("aic7xxx_abort returns 0x%x\n", error);
	return (error);
}

/*
 * Attempt to send a target reset message to the device that timed out.
 */
static int
ahc_linux_dev_reset(Scsi_Cmnd *cmd)
{
	int error;

	error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
	if (error != 0)
		printf("aic7xxx_dev_reset returns 0x%x\n", error);
	return (error);
}

/*
 * Reset the SCSI bus.
 */
static int
ahc_linux_bus_reset(Scsi_Cmnd *cmd)
{
	struct ahc_softc *ahc;
	u_long s;
	int    found;

	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
	ahc_midlayer_entrypoint_lock(ahc, &s);
	found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
				  /*initiate reset*/TRUE);
	ahc_linux_run_complete_queue(ahc);
	ahc_midlayer_entrypoint_unlock(ahc, &s);

	if (bootverbose)
		printf("%s: SCSI bus reset delivered. "
		       "%d SCBs aborted.\n", ahc_name(ahc), found);

	return SUCCESS;
}

Scsi_Host_Template aic7xxx_driver_template = {
	.module			= THIS_MODULE,
	.name			= "aic7xxx",
	.proc_info		= ahc_linux_proc_info,
	.info			= ahc_linux_info,
	.queuecommand		= ahc_linux_queue,
	.eh_abort_handler	= ahc_linux_abort,
	.eh_device_reset_handler = ahc_linux_dev_reset,
	.eh_bus_reset_handler	= ahc_linux_bus_reset,
#if defined(__i386__)
	.bios_param		= ahc_linux_biosparam,
#endif
	.can_queue		= AHC_MAX_QUEUE,
	.this_id		= -1,
	.cmd_per_lun		= 2,
	.use_clustering		= ENABLE_CLUSTERING,
	.slave_alloc		= ahc_linux_slave_alloc,
	.slave_configure	= ahc_linux_slave_configure,
	.slave_destroy		= ahc_linux_slave_destroy,
};

/**************************** Tasklet Handler *********************************/

/*
 * In 2.4.X and above, this routine is called from a tasklet,
 * so we must re-acquire our lock prior to executing this code.
 * In all prior kernels, ahc_schedule_runq() calls this routine
 * directly and ahc_schedule_runq() is called with our lock held.
 */
static void
ahc_runq_tasklet(unsigned long data)
{
	struct ahc_softc* ahc;
	struct ahc_linux_device *dev;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
	u_long flags;