Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 292 insertions, 0 deletions

diff --git a/kernel/drivers/infiniband/hw/cxgb3/iwch.c b/kernel/drivers/infiniband/hw/cxgb3/iwch.c
new file mode 100644
index 000000000..8e77dc543
--- /dev/null
+++ b/kernel/drivers/infiniband/hw/cxgb3/iwch.c
@@ -0,0 +1,292 @@
+/*
+ * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include <rdma/ib_verbs.h>
+
+#include "cxgb3_offload.h"
+#include "iwch_provider.h"
+#include "iwch_user.h"
+#include "iwch.h"
+#include "iwch_cm.h"
+
+#define DRV_VERSION "1.1"
+
+MODULE_AUTHOR("Boyd Faulkner, Steve Wise");
+MODULE_DESCRIPTION("Chelsio T3 RDMA Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static void open_rnic_dev(struct t3cdev *);
+static void close_rnic_dev(struct t3cdev *);
+static void iwch_event_handler(struct t3cdev *, u32, u32);
+
+struct cxgb3_client t3c_client = {
+	.name = "iw_cxgb3",
+	.add = open_rnic_dev,
+	.remove = close_rnic_dev,
+	.handlers = t3c_handlers,
+	.redirect = iwch_ep_redirect,
+	.event_handler = iwch_event_handler
+};
+
+static LIST_HEAD(dev_list);
+static DEFINE_MUTEX(dev_mutex);
+
+static int disable_qp_db(int id, void *p, void *data)
+{
+	struct iwch_qp *qhp = p;
+
+	cxio_disable_wq_db(&qhp->wq);
+	return 0;
+}
+
+static int enable_qp_db(int id, void *p, void *data)
+{
+	struct iwch_qp *qhp = p;
+
+	if (data)
+		ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell, qhp->wq.qpid);
+	cxio_enable_wq_db(&qhp->wq);
+	return 0;
+}
+
+static void disable_dbs(struct iwch_dev *rnicp)
+{
+	spin_lock_irq(&rnicp->lock);
+	idr_for_each(&rnicp->qpidr, disable_qp_db, NULL);
+	spin_unlock_irq(&rnicp->lock);
+}
+
+static void enable_dbs(struct iwch_dev *rnicp, int ring_db)
+{
+	spin_lock_irq(&rnicp->lock);
+	idr_for_each(&rnicp->qpidr, enable_qp_db,
+		     (void *)(unsigned long)ring_db);
+	spin_unlock_irq(&rnicp->lock);
+}
+
+static void iwch_db_drop_task(struct work_struct *work)
+{
+	struct iwch_dev *rnicp = container_of(work, struct iwch_dev,
+					      db_drop_task.work);
+	enable_dbs(rnicp, 1);
+}
+
+static void rnic_init(struct iwch_dev *rnicp)
+{
+	PDBG("%s iwch_dev %p\n", __func__,  rnicp);
+	idr_init(&rnicp->cqidr);
+	idr_init(&rnicp->qpidr);
+	idr_init(&rnicp->mmidr);
+	spin_lock_init(&rnicp->lock);
+	INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task);
+
+	rnicp->attr.max_qps = T3_MAX_NUM_QP - 32;
+	rnicp->attr.max_wrs = T3_MAX_QP_DEPTH;
+	rnicp->attr.max_sge_per_wr = T3_MAX_SGE;
+	rnicp->attr.max_sge_per_rdma_write_wr = T3_MAX_SGE;
+	rnicp->attr.max_cqs = T3_MAX_NUM_CQ - 1;
+	rnicp->attr.max_cqes_per_cq = T3_MAX_CQ_DEPTH;
+	rnicp->attr.max_mem_regs = cxio_num_stags(&rnicp->rdev);
+	rnicp->attr.max_phys_buf_entries = T3_MAX_PBL_SIZE;
+	rnicp->attr.max_pds = T3_MAX_NUM_PD - 1;
+	rnicp->attr.mem_pgsizes_bitmask = T3_PAGESIZE_MASK;
+	rnicp->attr.max_mr_size = T3_MAX_MR_SIZE;
+	rnicp->attr.can_resize_wq = 0;
+	rnicp->attr.max_rdma_reads_per_qp = 8;
+	rnicp->attr.max_rdma_read_resources =
+	    rnicp->attr.max_rdma_reads_per_qp * rnicp->attr.max_qps;
+	rnicp->attr.max_rdma_read_qp_depth = 8;	/* IRD */
+	rnicp->attr.max_rdma_read_depth =
+	    rnicp->attr.max_rdma_read_qp_depth * rnicp->attr.max_qps;
+	rnicp->attr.rq_overflow_handled = 0;
+	rnicp->attr.can_modify_ird = 0;
+	rnicp->attr.can_modify_ord = 0;
+	rnicp->attr.max_mem_windows = rnicp->attr.max_mem_regs - 1;
+	rnicp->attr.stag0_value = 1;
+	rnicp->attr.zbva_support = 1;
+	rnicp->attr.local_invalidate_fence = 1;
+	rnicp->attr.cq_overflow_detection = 1;
+	return;
+}
+
+static void open_rnic_dev(struct t3cdev *tdev)
+{
+	struct iwch_dev *rnicp;
+
+	PDBG("%s t3cdev %p\n", __func__,  tdev);
+	printk_once(KERN_INFO MOD "Chelsio T3 RDMA Driver - version %s\n",
+		       DRV_VERSION);
+	rnicp = (struct iwch_dev *)ib_alloc_device(sizeof(*rnicp));
+	if (!rnicp) {
+		printk(KERN_ERR MOD "Cannot allocate ib device\n");
+		return;
+	}
+	rnicp->rdev.ulp = rnicp;
+	rnicp->rdev.t3cdev_p = tdev;
+
+	mutex_lock(&dev_mutex);
+
+	if (cxio_rdev_open(&rnicp->rdev)) {
+		mutex_unlock(&dev_mutex);
+		printk(KERN_ERR MOD "Unable to open CXIO rdev\n");
+		ib_dealloc_device(&rnicp->ibdev);
+		return;
+	}
+
+	rnic_init(rnicp);
+
+	list_add_tail(&rnicp->entry, &dev_list);
+	mutex_unlock(&dev_mutex);
+
+	if (iwch_register_device(rnicp)) {
+		printk(KERN_ERR MOD "Unable to register device\n");
+		close_rnic_dev(tdev);
+	}
+	printk(KERN_INFO MOD "Initialized device %s\n",
+	       pci_name(rnicp->rdev.rnic_info.pdev));
+	return;
+}
+
+static void close_rnic_dev(struct t3cdev *tdev)
+{
+	struct iwch_dev *dev, *tmp;
+	PDBG("%s t3cdev %p\n", __func__,  tdev);
+	mutex_lock(&dev_mutex);
+	list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
+		if (dev->rdev.t3cdev_p == tdev) {
+			dev->rdev.flags = CXIO_ERROR_FATAL;
+			synchronize_net();
+			cancel_delayed_work_sync(&dev->db_drop_task);
+			list_del(&dev->entry);
+			iwch_unregister_device(dev);
+			cxio_rdev_close(&dev->rdev);
+			idr_destroy(&dev->cqidr);
+			idr_destroy(&dev->qpidr);
+			idr_destroy(&dev->mmidr);
+			ib_dealloc_device(&dev->ibdev);
+			break;
+		}
+	}
+	mutex_unlock(&dev_mutex);
+}
+
+static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
+{
+	struct cxio_rdev *rdev = tdev->ulp;
+	struct iwch_dev *rnicp;
+	struct ib_event event;
+	u32 portnum = port_id + 1;
+	int dispatch = 0;
+
+	if (!rdev)
+		return;
+	rnicp = rdev_to_iwch_dev(rdev);
+	switch (evt) {
+	case OFFLOAD_STATUS_DOWN: {
+		rdev->flags = CXIO_ERROR_FATAL;
+		synchronize_net();
+		event.event  = IB_EVENT_DEVICE_FATAL;
+		dispatch = 1;
+		break;
+		}
+	case OFFLOAD_PORT_DOWN: {
+		event.event  = IB_EVENT_PORT_ERR;
+		dispatch = 1;
+		break;
+		}
+	case OFFLOAD_PORT_UP: {
+		event.event  = IB_EVENT_PORT_ACTIVE;
+		dispatch = 1;
+		break;
+		}
+	case OFFLOAD_DB_FULL: {
+		disable_dbs(rnicp);
+		break;
+		}
+	case OFFLOAD_DB_EMPTY: {
+		enable_dbs(rnicp, 1);
+		break;
+		}
+	case OFFLOAD_DB_DROP: {
+		unsigned long delay = 1000;
+		unsigned short r;
+
+		disable_dbs(rnicp);
+		get_random_bytes(&r, 2);
+		delay += r & 1023;
+
+		/*
+		 * delay is between 1000-2023 usecs.
+		 */
+		schedule_delayed_work(&rnicp->db_drop_task,
+			usecs_to_jiffies(delay));
+		break;
+		}
+	}
+
+	if (dispatch) {
+		event.device = &rnicp->ibdev;
+		event.element.port_num = portnum;
+		ib_dispatch_event(&event);
+	}
+
+	return;
+}
+
+static int __init iwch_init_module(void)
+{
+	int err;
+
+	err = cxio_hal_init();
+	if (err)
+		return err;
+	err = iwch_cm_init();
+	if (err)
+		return err;
+	cxio_register_ev_cb(iwch_ev_dispatch);
+	cxgb3_register_client(&t3c_client);
+	return 0;
+}
+
+static void __exit iwch_exit_module(void)
+{
+	cxgb3_unregister_client(&t3c_client);
+	cxio_unregister_ev_cb(iwch_ev_dispatch);
+	iwch_cm_term();
+	cxio_hal_exit();
+}
+
+module_init(iwch_init_module);
+module_exit(iwch_exit_module);