iop.c

h内核

	i2o_driver_notify_controller_remove_all(c);

	list_del(&c->list);

	list_for_each_entry_safe(dev, tmp, &c->devices, list)
	    i2o_device_remove(dev);

	/* Ask the IOP to switch to RESET state */
	i2o_iop_reset(c);
}

/**
 *	i2o_systab_build - Build system table
 *
 *	The system table contains information about all the IOPs in the system
 *	(duh) and is used by the Executives on the IOPs to establish peer2peer
 *	connections. We're not supporting peer2peer at the moment, but this
 *	will be needed down the road for things like lan2lan forwarding.
 *
 *	Returns 0 on success or negative error code on failure.
 */
static int i2o_systab_build(void)
{
	struct i2o_controller *c, *tmp;
	int num_controllers = 0;
	u32 change_ind = 0;
	int count = 0;
	struct i2o_sys_tbl *systab = i2o_systab.virt;

	list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
	    num_controllers++;

	if (systab) {
		change_ind = systab->change_ind;
		kfree(i2o_systab.virt);
	}

	/* Header + IOPs */
	i2o_systab.len = sizeof(struct i2o_sys_tbl) + num_controllers *
	    sizeof(struct i2o_sys_tbl_entry);

	systab = i2o_systab.virt = kmalloc(i2o_systab.len, GFP_KERNEL);
	if (!systab) {
		printk(KERN_ERR "i2o: unable to allocate memory for System "
		       "Table\n");
		return -ENOMEM;
	}
	memset(systab, 0, i2o_systab.len);

	systab->version = I2OVERSION;
	systab->change_ind = change_ind + 1;

	list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
		i2o_status_block *sb;

		if (count >= num_controllers) {
			printk(KERN_ERR "i2o: controller added while building "
			       "system table\n");
			break;
		}

		sb = c->status_block.virt;

		/*
		 * Get updated IOP state so we have the latest information
		 *
		 * We should delete the controller at this point if it
		 * doesn't respond since if it's not on the system table
		 * it is techninically not part of the I2O subsystem...
		 */
		if (unlikely(i2o_status_get(c))) {
			printk(KERN_ERR "%s: Deleting b/c could not get status"
			       " while attempting to build system table\n",
			       c->name);
			i2o_iop_remove(c);
			continue;	// try the next one
		}

		systab->iops[count].org_id = sb->org_id;
		systab->iops[count].iop_id = c->unit + 2;
		systab->iops[count].seg_num = 0;
		systab->iops[count].i2o_version = sb->i2o_version;
		systab->iops[count].iop_state = sb->iop_state;
		systab->iops[count].msg_type = sb->msg_type;
		systab->iops[count].frame_size = sb->inbound_frame_size;
		systab->iops[count].last_changed = change_ind;
		systab->iops[count].iop_capabilities = sb->iop_capabilities;
		systab->iops[count].inbound_low = i2o_ptr_low(c->post_port);
		systab->iops[count].inbound_high = i2o_ptr_high(c->post_port);

		count++;
	}

	systab->num_entries = count;

	return 0;
};

/**
 *	i2o_parse_hrt - Parse the hardware resource table.
 *	@c: I2O controller
 *
 *	We don't do anything with it except dumping it (in debug mode).
 *
 *	Returns 0.
 */
static int i2o_parse_hrt(struct i2o_controller *c)
{
	i2o_dump_hrt(c);
	return 0;
};

/**
 *	i2o_status_get - Get the status block from the I2O controller
 *	@c: I2O controller
 *
 *	Issue a status query on the controller. This updates the attached
 *	status block. The status block could then be accessed through
 *	c->status_block.
 *
 *	Returns 0 on sucess or negative error code on failure.
 */
int i2o_status_get(struct i2o_controller *c)
{
	struct i2o_message __iomem *msg;
	u32 m;
	u8 *status_block;
	unsigned long timeout;

	status_block = (u8 *) c->status_block.virt;
	memset(status_block, 0, sizeof(i2o_status_block));

	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
	if (m == I2O_QUEUE_EMPTY)
		return -ETIMEDOUT;

	writel(NINE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
	writel(I2O_CMD_STATUS_GET << 24 | HOST_TID << 12 | ADAPTER_TID,
	       &msg->u.head[1]);
	writel(i2o_exec_driver.context, &msg->u.s.icntxt);
	writel(0, &msg->u.s.tcntxt);	// FIXME: use resonable transaction context
	writel(0, &msg->body[0]);
	writel(0, &msg->body[1]);
	writel(i2o_ptr_low((void *)c->status_block.phys), &msg->body[2]);
	writel(i2o_ptr_high((void *)c->status_block.phys), &msg->body[3]);
	writel(sizeof(i2o_status_block), &msg->body[4]);	/* always 88 bytes */

	i2o_msg_post(c, m);

	/* Wait for a reply */
	timeout = jiffies + I2O_TIMEOUT_STATUS_GET * HZ;
	while (status_block[87] != 0xFF) {
		if (time_after(jiffies, timeout)) {
			printk(KERN_ERR "%s: Get status timeout.\n", c->name);
			return -ETIMEDOUT;
		}

		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(1);

		rmb();
	}

#ifdef DEBUG
	i2o_debug_state(c);
#endif

	return 0;
}

/*
 *	i2o_hrt_get - Get the Hardware Resource Table from the I2O controller
 *	@c: I2O controller from which the HRT should be fetched
 *
 *	The HRT contains information about possible hidden devices but is
 *	mostly useless to us.
 *
 *	Returns 0 on success or negativer error code on failure.
 */
static int i2o_hrt_get(struct i2o_controller *c)
{
	int rc;
	int i;
	i2o_hrt *hrt = c->hrt.virt;
	u32 size = sizeof(i2o_hrt);
	struct device *dev = &c->pdev->dev;

	for (i = 0; i < I2O_HRT_GET_TRIES; i++) {
		struct i2o_message __iomem *msg;
		u32 m;

		m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
		if (m == I2O_QUEUE_EMPTY)
			return -ETIMEDOUT;

		writel(SIX_WORD_MSG_SIZE | SGL_OFFSET_4, &msg->u.head[0]);
		writel(I2O_CMD_HRT_GET << 24 | HOST_TID << 12 | ADAPTER_TID,
		       &msg->u.head[1]);
		writel(0xd0000000 | c->hrt.len, &msg->body[0]);
		writel(c->hrt.phys, &msg->body[1]);

		rc = i2o_msg_post_wait_mem(c, m, 20, &c->hrt);

		if (rc < 0) {
			printk(KERN_ERR "%s: Unable to get HRT (status=%#x)\n",
			       c->name, -rc);
			return rc;
		}

		size = hrt->num_entries * hrt->entry_len << 2;
		if (size > c->hrt.len) {
			if (i2o_dma_realloc(dev, &c->hrt, size, GFP_KERNEL))
				return -ENOMEM;
			else
				hrt = c->hrt.virt;
		} else
			return i2o_parse_hrt(c);
	}

	printk(KERN_ERR "%s: Unable to get HRT after %d tries, giving up\n",
	       c->name, I2O_HRT_GET_TRIES);

	return -EBUSY;
}

/**
 *	i2o_iop_alloc - Allocate and initialize a i2o_controller struct
 *
 *	Allocate the necessary memory for a i2o_controller struct and
 *	initialize the lists.
 *
 *	Returns a pointer to the I2O controller or a negative error code on
 *	failure.
 */
struct i2o_controller *i2o_iop_alloc(void)
{
	static int unit = 0;	/* 0 and 1 are NULL IOP and Local Host */
	struct i2o_controller *c;

	c = kmalloc(sizeof(*c), GFP_KERNEL);
	if (!c) {
		printk(KERN_ERR "i2o: Insufficient memory to allocate a I2O "
		       "controller.\n");
		return ERR_PTR(-ENOMEM);
	}
	memset(c, 0, sizeof(*c));

	INIT_LIST_HEAD(&c->devices);
	spin_lock_init(&c->lock);
	init_MUTEX(&c->lct_lock);
	c->unit = unit++;
	sprintf(c->name, "iop%d", c->unit);

#if BITS_PER_LONG == 64
	spin_lock_init(&c->context_list_lock);
	atomic_set(&c->context_list_counter, 0);
	INIT_LIST_HEAD(&c->context_list);
#endif

	return c;
};

/**
 *	i2o_iop_free - Free the i2o_controller struct
 *	@c: I2O controller to free
 */
void i2o_iop_free(struct i2o_controller *c)
{
	kfree(c);
};

/**
 *	i2o_iop_add - Initialize the I2O controller and add him to the I2O core
 *	@c: controller
 *
 *	Initialize the I2O controller and if no error occurs add him to the I2O
 *	core.
 *
 *	Returns 0 on success or negative error code on failure.
 */
int i2o_iop_add(struct i2o_controller *c)
{
	int rc;

	printk(KERN_INFO "%s: Activating I2O controller...\n", c->name);
	printk(KERN_INFO "%s: This may take a few minutes if there are many "
	       "devices\n", c->name);

	if ((rc = i2o_iop_activate(c))) {
		printk(KERN_ERR "%s: could not activate controller\n",
		       c->name);
		i2o_iop_reset(c);
		return rc;
	}

	pr_debug("%s: building sys table...\n", c->name);

	if ((rc = i2o_systab_build())) {
		i2o_iop_reset(c);
		return rc;
	}

	pr_debug("%s: online controller...\n", c->name);

	if ((rc = i2o_iop_online(c))) {
		i2o_iop_reset(c);
		return rc;
	}

	pr_debug("%s: getting LCT...\n", c->name);

	if ((rc = i2o_exec_lct_get(c))) {
		i2o_iop_reset(c);
		return rc;
	}

	list_add(&c->list, &i2o_controllers);

	i2o_driver_notify_controller_add_all(c);

	printk(KERN_INFO "%s: Controller added\n", c->name);

	return 0;
};

/**
 *	i2o_event_register - Turn on/off event notification for a I2O device
 *	@dev: I2O device which should receive the event registration request
 *	@drv: driver which want to get notified
 *	@tcntxt: transaction context to use with this notifier
 *	@evt_mask: mask of events
 *
 *	Create and posts an event registration message to the task. No reply
 *	is waited for, or expected. If you do not want further notifications,
 *	call the i2o_event_register again with a evt_mask of 0.
 *
 *	Returns 0 on success or -ETIMEDOUT if no message could be fetched for
 *	sending the request.
 */
int i2o_event_register(struct i2o_device *dev, struct i2o_driver *drv,
		       int tcntxt, u32 evt_mask)
{
	struct i2o_controller *c = dev->iop;
	struct i2o_message __iomem *msg;
	u32 m;

	m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
	if (m == I2O_QUEUE_EMPTY)
		return -ETIMEDOUT;

	writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
	writel(I2O_CMD_UTIL_EVT_REGISTER << 24 | HOST_TID << 12 | dev->lct_data.
	       tid, &msg->u.head[1]);
	writel(drv->context, &msg->u.s.icntxt);
	writel(tcntxt, &msg->u.s.tcntxt);
	writel(evt_mask, &msg->body[0]);

	i2o_msg_post(c, m);

	return 0;
};

/**
 *	i2o_iop_init - I2O main initialization function
 *
 *	Initialize the I2O drivers (OSM) functions, register the Executive OSM,
 *	initialize the I2O PCI part and finally initialize I2O device stuff.
 *
 *	Returns 0 on success or negative error code on failure.
 */
static int __init i2o_iop_init(void)
{
	int rc = 0;

	printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");

	rc = i2o_device_init();
	if (rc)
		goto exit;

	rc = i2o_driver_init();
	if (rc)
		goto device_exit;

	rc = i2o_exec_init();
	if (rc)
		goto driver_exit;

	rc = i2o_pci_init();
	if (rc < 0)
		goto exec_exit;

	return 0;

      exec_exit:
	i2o_exec_exit();

      driver_exit:
	i2o_driver_exit();

      device_exit:
	i2o_device_exit();

      exit:
	return rc;
}

/**
 *	i2o_iop_exit - I2O main exit function
 *
 *	Removes I2O controllers from PCI subsystem and shut down OSMs.
 */
static void __exit i2o_iop_exit(void)
{
	i2o_pci_exit();
	i2o_exec_exit();
	i2o_driver_exit();
	i2o_device_exit();
};

module_init(i2o_iop_init);
module_exit(i2o_iop_exit);

MODULE_AUTHOR("Red Hat Software");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(OSM_DESCRIPTION);
MODULE_VERSION(OSM_VERSION);

#if BITS_PER_LONG == 64
EXPORT_SYMBOL(i2o_cntxt_list_add);
EXPORT_SYMBOL(i2o_cntxt_list_get);
EXPORT_SYMBOL(i2o_cntxt_list_remove);
EXPORT_SYMBOL(i2o_cntxt_list_get_ptr);
#endif
EXPORT_SYMBOL(i2o_msg_get_wait);
EXPORT_SYMBOL(i2o_msg_nop);
EXPORT_SYMBOL(i2o_find_iop);
EXPORT_SYMBOL(i2o_iop_find_device);
EXPORT_SYMBOL(i2o_event_register);
EXPORT_SYMBOL(i2o_status_get);
EXPORT_SYMBOL(i2o_controllers);