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, 440 insertions, 0 deletions

diff --git a/kernel/drivers/infiniband/hw/amso1100/c2_cq.c b/kernel/drivers/infiniband/hw/amso1100/c2_cq.c
new file mode 100644
index 000000000..1b63185b4
--- /dev/null
+++ b/kernel/drivers/infiniband/hw/amso1100/c2_cq.c
@@ -0,0 +1,440 @@
+/*
+ * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ * Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005 Open Grid Computing, 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/gfp.h>
+
+#include "c2.h"
+#include "c2_vq.h"
+#include "c2_status.h"
+
+#define C2_CQ_MSG_SIZE ((sizeof(struct c2wr_ce) + 32-1) & ~(32-1))
+
+static struct c2_cq *c2_cq_get(struct c2_dev *c2dev, int cqn)
+{
+	struct c2_cq *cq;
+	unsigned long flags;
+
+	spin_lock_irqsave(&c2dev->lock, flags);
+	cq = c2dev->qptr_array[cqn];
+	if (!cq) {
+		spin_unlock_irqrestore(&c2dev->lock, flags);
+		return NULL;
+	}
+	atomic_inc(&cq->refcount);
+	spin_unlock_irqrestore(&c2dev->lock, flags);
+	return cq;
+}
+
+static void c2_cq_put(struct c2_cq *cq)
+{
+	if (atomic_dec_and_test(&cq->refcount))
+		wake_up(&cq->wait);
+}
+
+void c2_cq_event(struct c2_dev *c2dev, u32 mq_index)
+{
+	struct c2_cq *cq;
+
+	cq = c2_cq_get(c2dev, mq_index);
+	if (!cq) {
+		printk("discarding events on destroyed CQN=%d\n", mq_index);
+		return;
+	}
+
+	(*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
+	c2_cq_put(cq);
+}
+
+void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index)
+{
+	struct c2_cq *cq;
+	struct c2_mq *q;
+
+	cq = c2_cq_get(c2dev, mq_index);
+	if (!cq)
+		return;
+
+	spin_lock_irq(&cq->lock);
+	q = &cq->mq;
+	if (q && !c2_mq_empty(q)) {
+		u16 priv = q->priv;
+		struct c2wr_ce *msg;
+
+		while (priv != be16_to_cpu(*q->shared)) {
+			msg = (struct c2wr_ce *)
+				(q->msg_pool.host + priv * q->msg_size);
+			if (msg->qp_user_context == (u64) (unsigned long) qp) {
+				msg->qp_user_context = (u64) 0;
+			}
+			priv = (priv + 1) % q->q_size;
+		}
+	}
+	spin_unlock_irq(&cq->lock);
+	c2_cq_put(cq);
+}
+
+static inline enum ib_wc_status c2_cqe_status_to_openib(u8 status)
+{
+	switch (status) {
+	case C2_OK:
+		return IB_WC_SUCCESS;
+	case CCERR_FLUSHED:
+		return IB_WC_WR_FLUSH_ERR;
+	case CCERR_BASE_AND_BOUNDS_VIOLATION:
+		return IB_WC_LOC_PROT_ERR;
+	case CCERR_ACCESS_VIOLATION:
+		return IB_WC_LOC_ACCESS_ERR;
+	case CCERR_TOTAL_LENGTH_TOO_BIG:
+		return IB_WC_LOC_LEN_ERR;
+	case CCERR_INVALID_WINDOW:
+		return IB_WC_MW_BIND_ERR;
+	default:
+		return IB_WC_GENERAL_ERR;
+	}
+}
+
+
+static inline int c2_poll_one(struct c2_dev *c2dev,
+			      struct c2_cq *cq, struct ib_wc *entry)
+{
+	struct c2wr_ce *ce;
+	struct c2_qp *qp;
+	int is_recv = 0;
+
+	ce = c2_mq_consume(&cq->mq);
+	if (!ce) {
+		return -EAGAIN;
+	}
+
+	/*
+	 * if the qp returned is null then this qp has already
+	 * been freed and we are unable process the completion.
+	 * try pulling the next message
+	 */
+	while ((qp =
+		(struct c2_qp *) (unsigned long) ce->qp_user_context) == NULL) {
+		c2_mq_free(&cq->mq);
+		ce = c2_mq_consume(&cq->mq);
+		if (!ce)
+			return -EAGAIN;
+	}
+
+	entry->status = c2_cqe_status_to_openib(c2_wr_get_result(ce));
+	entry->wr_id = ce->hdr.context;
+	entry->qp = &qp->ibqp;
+	entry->wc_flags = 0;
+	entry->slid = 0;
+	entry->sl = 0;
+	entry->src_qp = 0;
+	entry->dlid_path_bits = 0;
+	entry->pkey_index = 0;
+
+	switch (c2_wr_get_id(ce)) {
+	case C2_WR_TYPE_SEND:
+		entry->opcode = IB_WC_SEND;
+		break;
+	case C2_WR_TYPE_RDMA_WRITE:
+		entry->opcode = IB_WC_RDMA_WRITE;
+		break;
+	case C2_WR_TYPE_RDMA_READ:
+		entry->opcode = IB_WC_RDMA_READ;
+		break;
+	case C2_WR_TYPE_BIND_MW:
+		entry->opcode = IB_WC_BIND_MW;
+		break;
+	case C2_WR_TYPE_RECV:
+		entry->byte_len = be32_to_cpu(ce->bytes_rcvd);
+		entry->opcode = IB_WC_RECV;
+		is_recv = 1;
+		break;
+	default:
+		break;
+	}
+
+	/* consume the WQEs */
+	if (is_recv)
+		c2_mq_lconsume(&qp->rq_mq, 1);
+	else
+		c2_mq_lconsume(&qp->sq_mq,
+			       be32_to_cpu(c2_wr_get_wqe_count(ce)) + 1);
+
+	/* free the message */
+	c2_mq_free(&cq->mq);
+
+	return 0;
+}
+
+int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
+{
+	struct c2_dev *c2dev = to_c2dev(ibcq->device);
+	struct c2_cq *cq = to_c2cq(ibcq);
+	unsigned long flags;
+	int npolled, err;
+
+	spin_lock_irqsave(&cq->lock, flags);
+
+	for (npolled = 0; npolled < num_entries; ++npolled) {
+
+		err = c2_poll_one(c2dev, cq, entry + npolled);
+		if (err)
+			break;
+	}
+
+	spin_unlock_irqrestore(&cq->lock, flags);
+
+	return npolled;
+}
+
+int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
+{
+	struct c2_mq_shared __iomem *shared;
+	struct c2_cq *cq;
+	unsigned long flags;
+	int ret = 0;
+
+	cq = to_c2cq(ibcq);
+	shared = cq->mq.peer;
+
+	if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_NEXT_COMP)
+		writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type);
+	else if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
+		writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type);
+	else
+		return -EINVAL;
+
+	writeb(CQ_WAIT_FOR_DMA | CQ_ARMED, &shared->armed);
+
+	/*
+	 * Now read back shared->armed to make the PCI
+	 * write synchronous.  This is necessary for
+	 * correct cq notification semantics.
+	 */
+	readb(&shared->armed);
+
+	if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
+		spin_lock_irqsave(&cq->lock, flags);
+		ret = !c2_mq_empty(&cq->mq);
+		spin_unlock_irqrestore(&cq->lock, flags);
+	}
+
+	return ret;
+}
+
+static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
+{
+	dma_free_coherent(&c2dev->pcidev->dev, mq->q_size * mq->msg_size,
+			  mq->msg_pool.host, dma_unmap_addr(mq, mapping));
+}
+
+static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq,
+			   size_t q_size, size_t msg_size)
+{
+	u8 *pool_start;
+
+	if (q_size > SIZE_MAX / msg_size)
+		return -EINVAL;
+
+	pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
+					&mq->host_dma, GFP_KERNEL);
+	if (!pool_start)
+		return -ENOMEM;
+
+	c2_mq_rep_init(mq,
+		       0,		/* index (currently unknown) */
+		       q_size,
+		       msg_size,
+		       pool_start,
+		       NULL,	/* peer (currently unknown) */
+		       C2_MQ_HOST_TARGET);
+
+	dma_unmap_addr_set(mq, mapping, mq->host_dma);
+
+	return 0;
+}
+
+int c2_init_cq(struct c2_dev *c2dev, int entries,
+	       struct c2_ucontext *ctx, struct c2_cq *cq)
+{
+	struct c2wr_cq_create_req wr;
+	struct c2wr_cq_create_rep *reply;
+	unsigned long peer_pa;
+	struct c2_vq_req *vq_req;
+	int err;
+
+	might_sleep();
+
+	cq->ibcq.cqe = entries - 1;
+	cq->is_kernel = !ctx;
+
+	/* Allocate a shared pointer */
+	cq->mq.shared = c2_alloc_mqsp(c2dev, c2dev->kern_mqsp_pool,
+				      &cq->mq.shared_dma, GFP_KERNEL);
+	if (!cq->mq.shared)
+		return -ENOMEM;
+
+	/* Allocate pages for the message pool */
+	err = c2_alloc_cq_buf(c2dev, &cq->mq, entries + 1, C2_CQ_MSG_SIZE);
+	if (err)
+		goto bail0;
+
+	vq_req = vq_req_alloc(c2dev);
+	if (!vq_req) {
+		err = -ENOMEM;
+		goto bail1;
+	}
+
+	memset(&wr, 0, sizeof(wr));
+	c2_wr_set_id(&wr, CCWR_CQ_CREATE);
+	wr.hdr.context = (unsigned long) vq_req;
+	wr.rnic_handle = c2dev->adapter_handle;
+	wr.msg_size = cpu_to_be32(cq->mq.msg_size);
+	wr.depth = cpu_to_be32(cq->mq.q_size);
+	wr.shared_ht = cpu_to_be64(cq->mq.shared_dma);
+	wr.msg_pool = cpu_to_be64(cq->mq.host_dma);
+	wr.user_context = (u64) (unsigned long) (cq);
+
+	vq_req_get(c2dev, vq_req);
+
+	err = vq_send_wr(c2dev, (union c2wr *) & wr);
+	if (err) {
+		vq_req_put(c2dev, vq_req);
+		goto bail2;
+	}
+
+	err = vq_wait_for_reply(c2dev, vq_req);
+	if (err)
+		goto bail2;
+
+	reply = (struct c2wr_cq_create_rep *) (unsigned long) (vq_req->reply_msg);
+	if (!reply) {
+		err = -ENOMEM;
+		goto bail2;
+	}
+
+	if ((err = c2_errno(reply)) != 0)
+		goto bail3;
+
+	cq->adapter_handle = reply->cq_handle;
+	cq->mq.index = be32_to_cpu(reply->mq_index);
+
+	peer_pa = c2dev->pa + be32_to_cpu(reply->adapter_shared);
+	cq->mq.peer = ioremap_nocache(peer_pa, PAGE_SIZE);
+	if (!cq->mq.peer) {
+		err = -ENOMEM;
+		goto bail3;
+	}
+
+	vq_repbuf_free(c2dev, reply);
+	vq_req_free(c2dev, vq_req);
+
+	spin_lock_init(&cq->lock);
+	atomic_set(&cq->refcount, 1);
+	init_waitqueue_head(&cq->wait);
+
+	/*
+	 * Use the MQ index allocated by the adapter to
+	 * store the CQ in the qptr_array
+	 */
+	cq->cqn = cq->mq.index;
+	c2dev->qptr_array[cq->cqn] = cq;
+
+	return 0;
+
+      bail3:
+	vq_repbuf_free(c2dev, reply);
+      bail2:
+	vq_req_free(c2dev, vq_req);
+      bail1:
+	c2_free_cq_buf(c2dev, &cq->mq);
+      bail0:
+	c2_free_mqsp(cq->mq.shared);
+
+	return err;
+}
+
+void c2_free_cq(struct c2_dev *c2dev, struct c2_cq *cq)
+{
+	int err;
+	struct c2_vq_req *vq_req;
+	struct c2wr_cq_destroy_req wr;
+	struct c2wr_cq_destroy_rep *reply;
+
+	might_sleep();
+
+	/* Clear CQ from the qptr array */
+	spin_lock_irq(&c2dev->lock);
+	c2dev->qptr_array[cq->mq.index] = NULL;
+	atomic_dec(&cq->refcount);
+	spin_unlock_irq(&c2dev->lock);
+
+	wait_event(cq->wait, !atomic_read(&cq->refcount));
+
+	vq_req = vq_req_alloc(c2dev);
+	if (!vq_req) {
+		goto bail0;
+	}
+
+	memset(&wr, 0, sizeof(wr));
+	c2_wr_set_id(&wr, CCWR_CQ_DESTROY);
+	wr.hdr.context = (unsigned long) vq_req;
+	wr.rnic_handle = c2dev->adapter_handle;
+	wr.cq_handle = cq->adapter_handle;
+
+	vq_req_get(c2dev, vq_req);
+
+	err = vq_send_wr(c2dev, (union c2wr *) & wr);
+	if (err) {
+		vq_req_put(c2dev, vq_req);
+		goto bail1;
+	}
+
+	err = vq_wait_for_reply(c2dev, vq_req);
+	if (err)
+		goto bail1;
+
+	reply = (struct c2wr_cq_destroy_rep *) (unsigned long) (vq_req->reply_msg);
+	if (reply)
+		vq_repbuf_free(c2dev, reply);
+      bail1:
+	vq_req_free(c2dev, vq_req);
+      bail0:
+	if (cq->is_kernel) {
+		c2_free_cq_buf(c2dev, &cq->mq);
+	}
+
+	return;
+}