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, 179 insertions, 0 deletions

diff --git a/kernel/drivers/infiniband/hw/mthca/mthca_memfree.h b/kernel/drivers/infiniband/hw/mthca/mthca_memfree.h
new file mode 100644
index 000000000..da9b8f9b8
--- /dev/null
+++ b/kernel/drivers/infiniband/hw/mthca/mthca_memfree.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Cisco Systems.  All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. 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.
+ */
+
+#ifndef MTHCA_MEMFREE_H
+#define MTHCA_MEMFREE_H
+
+#include <linux/list.h>
+#include <linux/mutex.h>
+
+#define MTHCA_ICM_CHUNK_LEN \
+	((256 - sizeof (struct list_head) - 2 * sizeof (int)) /		\
+	 (sizeof (struct scatterlist)))
+
+enum {
+	MTHCA_ICM_PAGE_SHIFT	= 12,
+	MTHCA_ICM_PAGE_SIZE	= 1 << MTHCA_ICM_PAGE_SHIFT,
+	MTHCA_DB_REC_PER_PAGE	= MTHCA_ICM_PAGE_SIZE / 8
+};
+
+struct mthca_icm_chunk {
+	struct list_head   list;
+	int                npages;
+	int                nsg;
+	struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
+};
+
+struct mthca_icm {
+	struct list_head chunk_list;
+	int              refcount;
+};
+
+struct mthca_icm_table {
+	u64               virt;
+	int               num_icm;
+	int               num_obj;
+	int               obj_size;
+	int               lowmem;
+	int               coherent;
+	struct mutex      mutex;
+	struct mthca_icm *icm[0];
+};
+
+struct mthca_icm_iter {
+	struct mthca_icm       *icm;
+	struct mthca_icm_chunk *chunk;
+	int                     page_idx;
+};
+
+struct mthca_dev;
+
+struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
+				  gfp_t gfp_mask, int coherent);
+void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm, int coherent);
+
+struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
+					      u64 virt, int obj_size,
+					      int nobj, int reserved,
+					      int use_lowmem, int use_coherent);
+void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
+int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
+void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
+void *mthca_table_find(struct mthca_icm_table *table, int obj, dma_addr_t *dma_handle);
+int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
+			  int start, int end);
+void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
+			   int start, int end);
+
+static inline void mthca_icm_first(struct mthca_icm *icm,
+				   struct mthca_icm_iter *iter)
+{
+	iter->icm      = icm;
+	iter->chunk    = list_empty(&icm->chunk_list) ?
+		NULL : list_entry(icm->chunk_list.next,
+				  struct mthca_icm_chunk, list);
+	iter->page_idx = 0;
+}
+
+static inline int mthca_icm_last(struct mthca_icm_iter *iter)
+{
+	return !iter->chunk;
+}
+
+static inline void mthca_icm_next(struct mthca_icm_iter *iter)
+{
+	if (++iter->page_idx >= iter->chunk->nsg) {
+		if (iter->chunk->list.next == &iter->icm->chunk_list) {
+			iter->chunk = NULL;
+			return;
+		}
+
+		iter->chunk = list_entry(iter->chunk->list.next,
+					 struct mthca_icm_chunk, list);
+		iter->page_idx = 0;
+	}
+}
+
+static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
+{
+	return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
+}
+
+static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
+{
+	return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
+}
+
+struct mthca_db_page {
+	DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
+	__be64    *db_rec;
+	dma_addr_t mapping;
+};
+
+struct mthca_db_table {
+	int 	       	      npages;
+	int 	       	      max_group1;
+	int 	       	      min_group2;
+	struct mthca_db_page *page;
+	struct mutex          mutex;
+};
+
+enum mthca_db_type {
+	MTHCA_DB_TYPE_INVALID   = 0x0,
+	MTHCA_DB_TYPE_CQ_SET_CI = 0x1,
+	MTHCA_DB_TYPE_CQ_ARM    = 0x2,
+	MTHCA_DB_TYPE_SQ        = 0x3,
+	MTHCA_DB_TYPE_RQ        = 0x4,
+	MTHCA_DB_TYPE_SRQ       = 0x5,
+	MTHCA_DB_TYPE_GROUP_SEP = 0x7
+};
+
+struct mthca_user_db_table;
+struct mthca_uar;
+
+int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
+		      struct mthca_user_db_table *db_tab, int index, u64 uaddr);
+void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
+			 struct mthca_user_db_table *db_tab, int index);
+struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev);
+void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
+			       struct mthca_user_db_table *db_tab);
+
+int mthca_init_db_tab(struct mthca_dev *dev);
+void mthca_cleanup_db_tab(struct mthca_dev *dev);
+int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
+		   u32 qn, __be32 **db);
+void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
+
+#endif /* MTHCA_MEMFREE_H */