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, 302 insertions, 0 deletions

diff --git a/kernel/drivers/infiniband/ulp/srp/ib_srp.h b/kernel/drivers/infiniband/ulp/srp/ib_srp.h
new file mode 100644
index 000000000..e690847a4
--- /dev/null
+++ b/kernel/drivers/infiniband/ulp/srp/ib_srp.h
@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2005 Cisco Systems.  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 IB_SRP_H
+#define IB_SRP_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_sa.h>
+#include <rdma/ib_cm.h>
+#include <rdma/ib_fmr_pool.h>
+
+enum {
+	SRP_PATH_REC_TIMEOUT_MS	= 1000,
+	SRP_ABORT_TIMEOUT_MS	= 5000,
+
+	SRP_PORT_REDIRECT	= 1,
+	SRP_DLID_REDIRECT	= 2,
+	SRP_STALE_CONN		= 3,
+
+	SRP_MAX_LUN		= 512,
+	SRP_DEF_SG_TABLESIZE	= 12,
+
+	SRP_DEFAULT_QUEUE_SIZE	= 1 << 6,
+	SRP_RSP_SQ_SIZE		= 1,
+	SRP_TSK_MGMT_SQ_SIZE	= 1,
+	SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
+				  SRP_TSK_MGMT_SQ_SIZE,
+
+	SRP_TAG_NO_REQ		= ~0U,
+	SRP_TAG_TSK_MGMT	= 1U << 31,
+
+	SRP_MAX_PAGES_PER_MR	= 512,
+
+	LOCAL_INV_WR_ID_MASK	= 1,
+	FAST_REG_WR_ID_MASK	= 2,
+
+	SRP_LAST_WR_ID		= 0xfffffffcU,
+};
+
+enum srp_target_state {
+	SRP_TARGET_SCANNING,
+	SRP_TARGET_LIVE,
+	SRP_TARGET_REMOVED,
+};
+
+enum srp_iu_type {
+	SRP_IU_CMD,
+	SRP_IU_TSK_MGMT,
+	SRP_IU_RSP,
+};
+
+/*
+ * @mr_page_mask: HCA memory registration page mask.
+ * @mr_page_size: HCA memory registration page size.
+ * @mr_max_size: Maximum size in bytes of a single FMR / FR registration
+ *   request.
+ */
+struct srp_device {
+	struct list_head	dev_list;
+	struct ib_device       *dev;
+	struct ib_pd	       *pd;
+	struct ib_mr	       *mr;
+	u64			mr_page_mask;
+	int			mr_page_size;
+	int			mr_max_size;
+	int			max_pages_per_mr;
+	bool			has_fmr;
+	bool			has_fr;
+	bool			use_fast_reg;
+};
+
+struct srp_host {
+	struct srp_device      *srp_dev;
+	u8			port;
+	struct device		dev;
+	struct list_head	target_list;
+	spinlock_t		target_lock;
+	struct completion	released;
+	struct list_head	list;
+	struct mutex		add_target_mutex;
+};
+
+struct srp_request {
+	struct scsi_cmnd       *scmnd;
+	struct srp_iu	       *cmd;
+	union {
+		struct ib_pool_fmr **fmr_list;
+		struct srp_fr_desc **fr_list;
+	};
+	u64		       *map_page;
+	struct srp_direct_buf  *indirect_desc;
+	dma_addr_t		indirect_dma_addr;
+	short			nmdesc;
+};
+
+/**
+ * struct srp_rdma_ch
+ * @comp_vector: Completion vector used by this RDMA channel.
+ */
+struct srp_rdma_ch {
+	/* These are RW in the hot path, and commonly used together */
+	struct list_head	free_tx;
+	spinlock_t		lock;
+	s32			req_lim;
+
+	/* These are read-only in the hot path */
+	struct srp_target_port *target ____cacheline_aligned_in_smp;
+	struct ib_cq	       *send_cq;
+	struct ib_cq	       *recv_cq;
+	struct ib_qp	       *qp;
+	union {
+		struct ib_fmr_pool     *fmr_pool;
+		struct srp_fr_pool     *fr_pool;
+	};
+
+	/* Everything above this point is used in the hot path of
+	 * command processing. Try to keep them packed into cachelines.
+	 */
+
+	struct completion	done;
+	int			status;
+
+	struct ib_sa_path_rec	path;
+	struct ib_sa_query     *path_query;
+	int			path_query_id;
+
+	struct ib_cm_id	       *cm_id;
+	struct srp_iu	      **tx_ring;
+	struct srp_iu	      **rx_ring;
+	struct srp_request     *req_ring;
+	int			max_ti_iu_len;
+	int			comp_vector;
+
+	struct completion	tsk_mgmt_done;
+	u8			tsk_mgmt_status;
+	bool			connected;
+};
+
+/**
+ * struct srp_target_port
+ * @comp_vector: Completion vector used by the first RDMA channel created for
+ *   this target port.
+ */
+struct srp_target_port {
+	/* read and written in the hot path */
+	spinlock_t		lock;
+
+	/* read only in the hot path */
+	struct srp_rdma_ch	*ch;
+	u32			ch_count;
+	u32			lkey;
+	u32			rkey;
+	enum srp_target_state	state;
+	unsigned int		max_iu_len;
+	unsigned int		cmd_sg_cnt;
+	unsigned int		indirect_size;
+	bool			allow_ext_sg;
+
+	/* other member variables */
+	union ib_gid		sgid;
+	__be64			id_ext;
+	__be64			ioc_guid;
+	__be64			service_id;
+	__be64			initiator_ext;
+	u16			io_class;
+	struct srp_host	       *srp_host;
+	struct Scsi_Host       *scsi_host;
+	struct srp_rport       *rport;
+	char			target_name[32];
+	unsigned int		scsi_id;
+	unsigned int		sg_tablesize;
+	int			queue_size;
+	int			req_ring_size;
+	int			comp_vector;
+	int			tl_retry_count;
+
+	union ib_gid		orig_dgid;
+	__be16			pkey;
+
+	u32			rq_tmo_jiffies;
+
+	int			zero_req_lim;
+
+	struct work_struct	tl_err_work;
+	struct work_struct	remove_work;
+
+	struct list_head	list;
+	bool			qp_in_error;
+};
+
+struct srp_iu {
+	struct list_head	list;
+	u64			dma;
+	void		       *buf;
+	size_t			size;
+	enum dma_data_direction	direction;
+};
+
+/**
+ * struct srp_fr_desc - fast registration work request arguments
+ * @entry: Entry in srp_fr_pool.free_list.
+ * @mr:    Memory region.
+ * @frpl:  Fast registration page list.
+ */
+struct srp_fr_desc {
+	struct list_head		entry;
+	struct ib_mr			*mr;
+	struct ib_fast_reg_page_list	*frpl;
+};
+
+/**
+ * struct srp_fr_pool - pool of fast registration descriptors
+ *
+ * An entry is available for allocation if and only if it occurs in @free_list.
+ *
+ * @size:      Number of descriptors in this pool.
+ * @max_page_list_len: Maximum fast registration work request page list length.
+ * @lock:      Protects free_list.
+ * @free_list: List of free descriptors.
+ * @desc:      Fast registration descriptor pool.
+ */
+struct srp_fr_pool {
+	int			size;
+	int			max_page_list_len;
+	spinlock_t		lock;
+	struct list_head	free_list;
+	struct srp_fr_desc	desc[0];
+};
+
+/**
+ * struct srp_map_state - per-request DMA memory mapping state
+ * @desc:	    Pointer to the element of the SRP buffer descriptor array
+ *		    that is being filled in.
+ * @pages:	    Array with DMA addresses of pages being considered for
+ *		    memory registration.
+ * @base_dma_addr:  DMA address of the first page that has not yet been mapped.
+ * @dma_len:	    Number of bytes that will be registered with the next
+ *		    FMR or FR memory registration call.
+ * @total_len:	    Total number of bytes in the sg-list being mapped.
+ * @npages:	    Number of page addresses in the pages[] array.
+ * @nmdesc:	    Number of FMR or FR memory descriptors used for mapping.
+ * @ndesc:	    Number of SRP buffer descriptors that have been filled in.
+ * @unmapped_sg:    First element of the sg-list that is mapped via FMR or FR.
+ * @unmapped_index: Index of the first element mapped via FMR or FR.
+ * @unmapped_addr:  DMA address of the first element mapped via FMR or FR.
+ */
+struct srp_map_state {
+	union {
+		struct ib_pool_fmr **next_fmr;
+		struct srp_fr_desc **next_fr;
+	};
+	struct srp_direct_buf  *desc;
+	u64		       *pages;
+	dma_addr_t		base_dma_addr;
+	u32			dma_len;
+	u32			total_len;
+	unsigned int		npages;
+	unsigned int		nmdesc;
+	unsigned int		ndesc;
+	struct scatterlist     *unmapped_sg;
+	int			unmapped_index;
+	dma_addr_t		unmapped_addr;
+};
+
+#endif /* IB_SRP_H */