ehca_main.c

linux内核源码

	if (sport->ibcq_aqp1) {
		ehca_err(&shca->ib_device, "AQP1 CQ is already created.");
		return -EPERM;
	}

	ibcq = ib_create_cq(&shca->ib_device, NULL, NULL, (void *)(-1), 10, 0);
	if (IS_ERR(ibcq)) {
		ehca_err(&shca->ib_device, "Cannot create AQP1 CQ.");
		return PTR_ERR(ibcq);
	}
	sport->ibcq_aqp1 = ibcq;

	if (sport->ibqp_aqp1) {
		ehca_err(&shca->ib_device, "AQP1 QP is already created.");
		ret = -EPERM;
		goto create_aqp1;
	}

	memset(&qp_init_attr, 0, sizeof(struct ib_qp_init_attr));
	qp_init_attr.send_cq          = ibcq;
	qp_init_attr.recv_cq          = ibcq;
	qp_init_attr.sq_sig_type      = IB_SIGNAL_ALL_WR;
	qp_init_attr.cap.max_send_wr  = 100;
	qp_init_attr.cap.max_recv_wr  = 100;
	qp_init_attr.cap.max_send_sge = 2;
	qp_init_attr.cap.max_recv_sge = 1;
	qp_init_attr.qp_type          = IB_QPT_GSI;
	qp_init_attr.port_num         = port;
	qp_init_attr.qp_context       = NULL;
	qp_init_attr.event_handler    = NULL;
	qp_init_attr.srq              = NULL;

	ibqp = ib_create_qp(&shca->pd->ib_pd, &qp_init_attr);
	if (IS_ERR(ibqp)) {
		ehca_err(&shca->ib_device, "Cannot create AQP1 QP.");
		ret = PTR_ERR(ibqp);
		goto create_aqp1;
	}
	sport->ibqp_aqp1 = ibqp;

	return 0;

create_aqp1:
	ib_destroy_cq(sport->ibcq_aqp1);
	return ret;
}

static int ehca_destroy_aqp1(struct ehca_sport *sport)
{
	int ret;

	ret = ib_destroy_qp(sport->ibqp_aqp1);
	if (ret) {
		ehca_gen_err("Cannot destroy AQP1 QP. ret=%i", ret);
		return ret;
	}

	ret = ib_destroy_cq(sport->ibcq_aqp1);
	if (ret)
		ehca_gen_err("Cannot destroy AQP1 CQ. ret=%i", ret);

	return ret;
}

static ssize_t ehca_show_debug_level(struct device_driver *ddp, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n",
			ehca_debug_level);
}

static ssize_t ehca_store_debug_level(struct device_driver *ddp,
				      const char *buf, size_t count)
{
	int value = (*buf) - '0';
	if (value >= 0 && value <= 9)
		ehca_debug_level = value;
	return 1;
}

DRIVER_ATTR(debug_level, S_IRUSR | S_IWUSR,
	    ehca_show_debug_level, ehca_store_debug_level);

static struct attribute *ehca_drv_attrs[] = {
	&driver_attr_debug_level.attr,
	NULL
};

static struct attribute_group ehca_drv_attr_grp = {
	.attrs = ehca_drv_attrs
};

#define EHCA_RESOURCE_ATTR(name)                                           \
static ssize_t  ehca_show_##name(struct device *dev,                       \
				 struct device_attribute *attr,            \
				 char *buf)                                \
{									   \
	struct ehca_shca *shca;						   \
	struct hipz_query_hca *rblock;				           \
	int data;                                                          \
									   \
	shca = dev->driver_data;					   \
									   \
	rblock = ehca_alloc_fw_ctrlblock(GFP_KERNEL);			   \
	if (!rblock) {						           \
		dev_err(dev, "Can't allocate rblock memory.\n");           \
		return 0;						   \
	}								   \
									   \
	if (hipz_h_query_hca(shca->ipz_hca_handle, rblock) != H_SUCCESS) { \
		dev_err(dev, "Can't query device properties\n");           \
		ehca_free_fw_ctrlblock(rblock);			   	   \
		return 0;					   	   \
	}								   \
									   \
	data = rblock->name;                                               \
	ehca_free_fw_ctrlblock(rblock);                                    \
									   \
	if ((strcmp(#name, "num_ports") == 0) && (ehca_nr_ports == 1))	   \
		return snprintf(buf, 256, "1\n");			   \
	else								   \
		return snprintf(buf, 256, "%d\n", data);		   \
									   \
}									   \
static DEVICE_ATTR(name, S_IRUGO, ehca_show_##name, NULL);

EHCA_RESOURCE_ATTR(num_ports);
EHCA_RESOURCE_ATTR(hw_ver);
EHCA_RESOURCE_ATTR(max_eq);
EHCA_RESOURCE_ATTR(cur_eq);
EHCA_RESOURCE_ATTR(max_cq);
EHCA_RESOURCE_ATTR(cur_cq);
EHCA_RESOURCE_ATTR(max_qp);
EHCA_RESOURCE_ATTR(cur_qp);
EHCA_RESOURCE_ATTR(max_mr);
EHCA_RESOURCE_ATTR(cur_mr);
EHCA_RESOURCE_ATTR(max_mw);
EHCA_RESOURCE_ATTR(cur_mw);
EHCA_RESOURCE_ATTR(max_pd);
EHCA_RESOURCE_ATTR(max_ah);

static ssize_t ehca_show_adapter_handle(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct ehca_shca *shca = dev->driver_data;

	return sprintf(buf, "%lx\n", shca->ipz_hca_handle.handle);

}
static DEVICE_ATTR(adapter_handle, S_IRUGO, ehca_show_adapter_handle, NULL);

static ssize_t ehca_show_mr_largepage(struct device *dev,
				      struct device_attribute *attr,
				      char *buf)
{
	return sprintf(buf, "%d\n", ehca_mr_largepage);
}
static DEVICE_ATTR(mr_largepage, S_IRUGO, ehca_show_mr_largepage, NULL);

static struct attribute *ehca_dev_attrs[] = {
	&dev_attr_adapter_handle.attr,
	&dev_attr_num_ports.attr,
	&dev_attr_hw_ver.attr,
	&dev_attr_max_eq.attr,
	&dev_attr_cur_eq.attr,
	&dev_attr_max_cq.attr,
	&dev_attr_cur_cq.attr,
	&dev_attr_max_qp.attr,
	&dev_attr_cur_qp.attr,
	&dev_attr_max_mr.attr,
	&dev_attr_cur_mr.attr,
	&dev_attr_max_mw.attr,
	&dev_attr_cur_mw.attr,
	&dev_attr_max_pd.attr,
	&dev_attr_max_ah.attr,
	&dev_attr_mr_largepage.attr,
	NULL
};

static struct attribute_group ehca_dev_attr_grp = {
	.attrs = ehca_dev_attrs
};

static int __devinit ehca_probe(struct of_device *dev,
				const struct of_device_id *id)
{
	struct ehca_shca *shca;
	const u64 *handle;
	struct ib_pd *ibpd;
	int ret;

	handle = of_get_property(dev->node, "ibm,hca-handle", NULL);
	if (!handle) {
		ehca_gen_err("Cannot get eHCA handle for adapter: %s.",
			     dev->node->full_name);
		return -ENODEV;
	}

	if (!(*handle)) {
		ehca_gen_err("Wrong eHCA handle for adapter: %s.",
			     dev->node->full_name);
		return -ENODEV;
	}

	shca = (struct ehca_shca *)ib_alloc_device(sizeof(*shca));
	if (!shca) {
		ehca_gen_err("Cannot allocate shca memory.");
		return -ENOMEM;
	}
	mutex_init(&shca->modify_mutex);

	shca->ofdev = dev;
	shca->ipz_hca_handle.handle = *handle;
	dev->dev.driver_data = shca;

	ret = ehca_sense_attributes(shca);
	if (ret < 0) {
		ehca_gen_err("Cannot sense eHCA attributes.");
		goto probe1;
	}

	ret = ehca_init_device(shca);
	if (ret) {
		ehca_gen_err("Cannot init ehca  device struct");
		goto probe1;
	}

	/* create event queues */
	ret = ehca_create_eq(shca, &shca->eq, EHCA_EQ, 2048);
	if (ret) {
		ehca_err(&shca->ib_device, "Cannot create EQ.");
		goto probe1;
	}

	ret = ehca_create_eq(shca, &shca->neq, EHCA_NEQ, 513);
	if (ret) {
		ehca_err(&shca->ib_device, "Cannot create NEQ.");
		goto probe3;
	}

	/* create internal protection domain */
	ibpd = ehca_alloc_pd(&shca->ib_device, (void *)(-1), NULL);
	if (IS_ERR(ibpd)) {
		ehca_err(&shca->ib_device, "Cannot create internal PD.");
		ret = PTR_ERR(ibpd);
		goto probe4;
	}

	shca->pd = container_of(ibpd, struct ehca_pd, ib_pd);
	shca->pd->ib_pd.device = &shca->ib_device;

	/* create internal max MR */
	ret = ehca_reg_internal_maxmr(shca, shca->pd, &shca->maxmr);

	if (ret) {
		ehca_err(&shca->ib_device, "Cannot create internal MR ret=%i",
			 ret);
		goto probe5;
	}

	ret = ib_register_device(&shca->ib_device);
	if (ret) {
		ehca_err(&shca->ib_device,
			 "ib_register_device() failed ret=%i", ret);
		goto probe6;
	}

	/* create AQP1 for port 1 */
	if (ehca_open_aqp1 == 1) {
		shca->sport[0].port_state = IB_PORT_DOWN;
		ret = ehca_create_aqp1(shca, 1);
		if (ret) {
			ehca_err(&shca->ib_device,
				 "Cannot create AQP1 for port 1.");
			goto probe7;
		}
	}

	/* create AQP1 for port 2 */
	if ((ehca_open_aqp1 == 1) && (shca->num_ports == 2)) {
		shca->sport[1].port_state = IB_PORT_DOWN;
		ret = ehca_create_aqp1(shca, 2);
		if (ret) {
			ehca_err(&shca->ib_device,
				 "Cannot create AQP1 for port 2.");
			goto probe8;
		}
	}

	ret = sysfs_create_group(&dev->dev.kobj, &ehca_dev_attr_grp);
	if (ret) /* only complain; we can live without attributes */
		ehca_err(&shca->ib_device,
			 "Cannot create device attributes  ret=%d", ret);

	spin_lock(&shca_list_lock);
	list_add(&shca->shca_list, &shca_list);
	spin_unlock(&shca_list_lock);

	return 0;

probe8:
	ret = ehca_destroy_aqp1(&shca->sport[0]);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy AQP1 for port 1. ret=%i", ret);

probe7:
	ib_unregister_device(&shca->ib_device);

probe6:
	ret = ehca_dereg_internal_maxmr(shca);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy internal MR. ret=%x", ret);

probe5:
	ret = ehca_dealloc_pd(&shca->pd->ib_pd);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy internal PD. ret=%x", ret);

probe4:
	ret = ehca_destroy_eq(shca, &shca->neq);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy NEQ. ret=%x", ret);

probe3:
	ret = ehca_destroy_eq(shca, &shca->eq);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy EQ. ret=%x", ret);

probe1:
	ib_dealloc_device(&shca->ib_device);

	return -EINVAL;
}

static int __devexit ehca_remove(struct of_device *dev)
{
	struct ehca_shca *shca = dev->dev.driver_data;
	int ret;

	sysfs_remove_group(&dev->dev.kobj, &ehca_dev_attr_grp);

	if (ehca_open_aqp1 == 1) {
		int i;
		for (i = 0; i < shca->num_ports; i++) {
			ret = ehca_destroy_aqp1(&shca->sport[i]);
			if (ret)
				ehca_err(&shca->ib_device,
					 "Cannot destroy AQP1 for port %x "
					 "ret=%i", ret, i);
		}
	}

	ib_unregister_device(&shca->ib_device);

	ret = ehca_dereg_internal_maxmr(shca);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy internal MR. ret=%i", ret);

	ret = ehca_dealloc_pd(&shca->pd->ib_pd);
	if (ret)
		ehca_err(&shca->ib_device,
			 "Cannot destroy internal PD. ret=%i", ret);

	ret = ehca_destroy_eq(shca, &shca->eq);
	if (ret)
		ehca_err(&shca->ib_device, "Cannot destroy EQ. ret=%i", ret);

	ret = ehca_destroy_eq(shca, &shca->neq);
	if (ret)
		ehca_err(&shca->ib_device, "Canot destroy NEQ. ret=%i", ret);

	ib_dealloc_device(&shca->ib_device);

	spin_lock(&shca_list_lock);
	list_del(&shca->shca_list);
	spin_unlock(&shca_list_lock);

	return ret;
}

static struct of_device_id ehca_device_table[] =
{
	{
		.name       = "lhca",
		.compatible = "IBM,lhca",
	},
	{},
};

static struct of_platform_driver ehca_driver = {
	.name        = "ehca",
	.match_table = ehca_device_table,
	.probe       = ehca_probe,
	.remove      = ehca_remove,
};

void ehca_poll_eqs(unsigned long data)
{
	struct ehca_shca *shca;

	spin_lock(&shca_list_lock);
	list_for_each_entry(shca, &shca_list, shca_list) {
		if (shca->eq.is_initialized) {
			/* call deadman proc only if eq ptr does not change */
			struct ehca_eq *eq = &shca->eq;
			int max = 3;
			volatile u64 q_ofs, q_ofs2;
			u64 flags;
			spin_lock_irqsave(&eq->spinlock, flags);
			q_ofs = eq->ipz_queue.current_q_offset;
			spin_unlock_irqrestore(&eq->spinlock, flags);
			do {
				spin_lock_irqsave(&eq->spinlock, flags);
				q_ofs2 = eq->ipz_queue.current_q_offset;
				spin_unlock_irqrestore(&eq->spinlock, flags);
				max--;
			} while (q_ofs == q_ofs2 && max > 0);
			if (q_ofs == q_ofs2)
				ehca_process_eq(shca, 0);
		}
	}
	mod_timer(&poll_eqs_timer, jiffies + HZ);
	spin_unlock(&shca_list_lock);
}

int __init ehca_module_init(void)
{
	int ret;

	printk(KERN_INFO "eHCA Infiniband Device Driver "
	       "(Version " HCAD_VERSION ")\n");

	ret = ehca_create_comp_pool();
	if (ret) {
		ehca_gen_err("Cannot create comp pool.");
		return ret;
	}

	ret = ehca_create_slab_caches();
	if (ret) {
		ehca_gen_err("Cannot create SLAB caches");
		ret = -ENOMEM;
		goto module_init1;
	}

	ret = ibmebus_register_driver(&ehca_driver);
	if (ret) {
		ehca_gen_err("Cannot register eHCA device driver");
		ret = -EINVAL;
		goto module_init2;
	}

	ret = sysfs_create_group(&ehca_driver.driver.kobj, &ehca_drv_attr_grp);
	if (ret) /* only complain; we can live without attributes */
		ehca_gen_err("Cannot create driver attributes  ret=%d", ret);

	if (ehca_poll_all_eqs != 1) {
		ehca_gen_err("WARNING!!!");
		ehca_gen_err("It is possible to lose interrupts.");
	} else {
		init_timer(&poll_eqs_timer);
		poll_eqs_timer.function = ehca_poll_eqs;
		poll_eqs_timer.expires = jiffies + HZ;
		add_timer(&poll_eqs_timer);
	}

	return 0;

module_init2:
	ehca_destroy_slab_caches();

module_init1:
	ehca_destroy_comp_pool();
	return ret;
};

void __exit ehca_module_exit(void)
{
	if (ehca_poll_all_eqs == 1)
		del_timer_sync(&poll_eqs_timer);

	sysfs_remove_group(&ehca_driver.driver.kobj, &ehca_drv_attr_grp);
	ibmebus_unregister_driver(&ehca_driver);

	ehca_destroy_slab_caches();

	ehca_destroy_comp_pool();

	idr_destroy(&ehca_cq_idr);
	idr_destroy(&ehca_qp_idr);
};

module_init(ehca_module_init);
module_exit(ehca_module_exit);