drivers/infiniband/hw/ehca/ipz_pt_fn.h - kernel/skids - Git at Google

 /*
  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
  *
  *  internal queue handling
  *
  *  Authors: Waleri Fomin <fomin@de.ibm.com>
  *           Reinhard Ernst <rernst@de.ibm.com>
  *           Christoph Raisch <raisch@de.ibm.com>
  *
  *  Copyright (c) 2005 IBM Corporation
  *
  *  All rights reserved.
  *
  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  *  BSD.
  *
  * OpenIB BSD License
  *
  * 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.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */

 #ifndef __IPZ_PT_FN_H__
 #define __IPZ_PT_FN_H__

 #define EHCA_PAGESHIFT   12
 #define EHCA_PAGESIZE   4096UL
 #define EHCA_PAGEMASK   (~(EHCA_PAGESIZE-1))
 #define EHCA_PT_ENTRIES 512UL

 #include "ehca_tools.h"
 #include "ehca_qes.h"

 struct ehca_pd;
 struct ipz_small_queue_page;

 extern struct kmem_cache *small_qp_cache;

 /* struct generic ehca page */
 struct ipz_page {
 	u8 entries[EHCA_PAGESIZE];
 };

 #define IPZ_SPAGE_PER_KPAGE (PAGE_SIZE / 512)

 struct ipz_small_queue_page {
 	unsigned long page;
 	unsigned long bitmap[IPZ_SPAGE_PER_KPAGE / BITS_PER_LONG];
 	int fill;
 	void *mapped_addr;
 	u32 mmap_count;
 	struct list_head list;
 };

 /* struct generic queue in linux kernel virtual memory (kv) */
 struct ipz_queue {
 	u64 current_q_offset;	/* current queue entry */

 	struct ipz_page **queue_pages;	/* array of pages belonging to queue */
 	u32 qe_size;		/* queue entry size */
 	u32 act_nr_of_sg;
 	u32 queue_length;	/* queue length allocated in bytes */
 	u32 pagesize;
 	u32 toggle_state;	/* toggle flag - per page */
 	u32 offset; /* save offset within page for small_qp */
 	struct ipz_small_queue_page *small_page;
 };

 /*
  * return current Queue Entry for a certain q_offset
  * returns address (kv) of Queue Entry
  */
 static inline void *ipz_qeit_calc(struct ipz_queue *queue, u64 q_offset)
 {
 	struct ipz_page *current_page;
 	if (q_offset >= queue->queue_length)
 		return NULL;
 	current_page = (queue->queue_pages)[q_offset >> EHCA_PAGESHIFT];
 	return &current_page->entries[q_offset & (EHCA_PAGESIZE - 1)];
 }

 /*
  * return current Queue Entry
  * returns address (kv) of Queue Entry
  */
 static inline void *ipz_qeit_get(struct ipz_queue *queue)
 {
 	return ipz_qeit_calc(queue, queue->current_q_offset);
 }

 /*
  * return current Queue Page , increment Queue Page iterator from
  * page to page in struct ipz_queue, last increment will return 0! and
  * NOT wrap
  * returns address (kv) of Queue Page
  * warning don't use in parallel with ipz_QE_get_inc()
  */
 void *ipz_qpageit_get_inc(struct ipz_queue *queue);

 /*
  * return current Queue Entry, increment Queue Entry iterator by one
  * step in struct ipz_queue, will wrap in ringbuffer
  * returns address (kv) of Queue Entry BEFORE increment
  * warning don't use in parallel with ipz_qpageit_get_inc()
  */
 static inline void *ipz_qeit_get_inc(struct ipz_queue *queue)
 {
 	void *ret = ipz_qeit_get(queue);
 	queue->current_q_offset += queue->qe_size;
 	if (queue->current_q_offset >= queue->queue_length) {
 		queue->current_q_offset = 0;
 		/* toggle the valid flag */
 		queue->toggle_state = (~queue->toggle_state) & 1;
 	}

 	return ret;
 }

 /*
  * return a bool indicating whether current Queue Entry is valid
  */
 static inline int ipz_qeit_is_valid(struct ipz_queue *queue)
 {
 	struct ehca_cqe *cqe = ipz_qeit_get(queue);
 	return ((cqe->cqe_flags >> 7) == (queue->toggle_state & 1));
 }

 /*
  * return current Queue Entry, increment Queue Entry iterator by one
  * step in struct ipz_queue, will wrap in ringbuffer
  * returns address (kv) of Queue Entry BEFORE increment
  * returns 0 and does not increment, if wrong valid state
  * warning don't use in parallel with ipz_qpageit_get_inc()
  */
 static inline void *ipz_qeit_get_inc_valid(struct ipz_queue *queue)
 {
 	return ipz_qeit_is_valid(queue) ? ipz_qeit_get_inc(queue) : NULL;
 }

 /*
  * returns and resets Queue Entry iterator
  * returns address (kv) of first Queue Entry
  */
 static inline void *ipz_qeit_reset(struct ipz_queue *queue)
 {
 	queue->current_q_offset = 0;
 	return ipz_qeit_get(queue);
 }

 /*
  * return the q_offset corresponding to an absolute address
  */
 int ipz_queue_abs_to_offset(struct ipz_queue *queue, u64 addr, u64 *q_offset);

 /*
  * return the next queue offset. don't modify the queue.
  */
 static inline u64 ipz_queue_advance_offset(struct ipz_queue *queue, u64 offset)
 {
 	offset += queue->qe_size;
 	if (offset >= queue->queue_length) offset = 0;
 	return offset;
 }

 /* struct generic page table */
 struct ipz_pt {
 	u64 entries[EHCA_PT_ENTRIES];
 };

 /* struct page table for a queue, only to be used in pf */
 struct ipz_qpt {
 	/* queue page tables (kv), use u64 because we know the element length */
 	u64 *qpts;
 	u32 n_qpts;
 	u32 n_ptes;       /*  number of page table entries */
 	u64 *current_pte_addr;
 };

 /*
  * constructor for a ipz_queue_t, placement new for ipz_queue_t,
  * new for all dependent datastructors
  * all QP Tables are the same
  * flow:
  *    allocate+pin queue
  * see ipz_qpt_ctor()
  * returns true if ok, false if out of memory
  */
 int ipz_queue_ctor(struct ehca_pd *pd, struct ipz_queue *queue,
 		   const u32 nr_of_pages, const u32 pagesize,
 		   const u32 qe_size, const u32 nr_of_sg,
 		   int is_small);

 /*
  * destructor for a ipz_queue_t
  *  -# free queue
  *  see ipz_queue_ctor()
  *  returns true if ok, false if queue was NULL-ptr of free failed
  */
 int ipz_queue_dtor(struct ehca_pd *pd, struct ipz_queue *queue);

 /*
  * constructor for a ipz_qpt_t,
  * placement new for struct ipz_queue, new for all dependent datastructors
  * all QP Tables are the same,
  * flow:
  * -# allocate+pin queue
  * -# initialise ptcb
  * -# allocate+pin PTs
  * -# link PTs to a ring, according to HCA Arch, set bit62 id needed
  * -# the ring must have room for exactly nr_of_PTEs
  * see ipz_qpt_ctor()
  */
 void ipz_qpt_ctor(struct ipz_qpt *qpt,
 		  const u32 nr_of_qes,
 		  const u32 pagesize,
 		  const u32 qe_size,
 		  const u8 lowbyte, const u8 toggle,
 		  u32 * act_nr_of_QEs, u32 * act_nr_of_pages);

 /*
  * return current Queue Entry, increment Queue Entry iterator by one
  * step in struct ipz_queue, will wrap in ringbuffer
  * returns address (kv) of Queue Entry BEFORE increment
  * warning don't use in parallel with ipz_qpageit_get_inc()
  * warning unpredictable results may occur if steps>act_nr_of_queue_entries
  * fix EQ page problems
  */
 void *ipz_qeit_eq_get_inc(struct ipz_queue *queue);

 /*
  * return current Event Queue Entry, increment Queue Entry iterator
  * by one step in struct ipz_queue if valid, will wrap in ringbuffer
  * returns address (kv) of Queue Entry BEFORE increment
  * returns 0 and does not increment, if wrong valid state
  * warning don't use in parallel with ipz_queue_QPageit_get_inc()
  * warning unpredictable results may occur if steps>act_nr_of_queue_entries
  */
 static inline void *ipz_eqit_eq_get_inc_valid(struct ipz_queue *queue)
 {
 	void *ret = ipz_qeit_get(queue);
 	u32 qe = *(u8 *)ret;
 	if ((qe >> 7) != (queue->toggle_state & 1))
 		return NULL;
 	ipz_qeit_eq_get_inc(queue); /* this is a good one */
 	return ret;
 }

 static inline void *ipz_eqit_eq_peek_valid(struct ipz_queue *queue)
 {
 	void *ret = ipz_qeit_get(queue);
 	u32 qe = *(u8 *)ret;
 	if ((qe >> 7) != (queue->toggle_state & 1))
 		return NULL;
 	return ret;
 }

 /* returns address (GX) of first queue entry */
 static inline u64 ipz_qpt_get_firstpage(struct ipz_qpt *qpt)
 {
 	return be64_to_cpu(qpt->qpts[0]);
 }

 /* returns address (kv) of first page of queue page table */
 static inline void *ipz_qpt_get_qpt(struct ipz_qpt *qpt)
 {
 	return qpt->qpts;
 }

 #endif				/* __IPZ_PT_FN_H__ */
	/*
	* IBM eServer eHCA Infiniband device driver for Linux on POWER
	*
	* internal queue handling
	*
	* Authors: Waleri Fomin <fomin@de.ibm.com>
	* Reinhard Ernst <rernst@de.ibm.com>
	* Christoph Raisch <raisch@de.ibm.com>
	*
	* Copyright (c) 2005 IBM Corporation
	*
	* All rights reserved.
	*
	* This source code is distributed under a dual license of GPL v2.0 and OpenIB
	* BSD.
	*
	* OpenIB BSD License
	*
	* 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.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
	* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifndef __IPZ_PT_FN_H__
	#define __IPZ_PT_FN_H__

	#define EHCA_PAGESHIFT 12
	#define EHCA_PAGESIZE 4096UL
	#define EHCA_PAGEMASK (~(EHCA_PAGESIZE-1))
	#define EHCA_PT_ENTRIES 512UL

	#include "ehca_tools.h"
	#include "ehca_qes.h"

	struct ehca_pd;
	struct ipz_small_queue_page;

	extern struct kmem_cache *small_qp_cache;

	/* struct generic ehca page */
	struct ipz_page {
	u8 entries[EHCA_PAGESIZE];
	};

	#define IPZ_SPAGE_PER_KPAGE (PAGE_SIZE / 512)

	struct ipz_small_queue_page {
	unsigned long page;
	unsigned long bitmap[IPZ_SPAGE_PER_KPAGE / BITS_PER_LONG];
	int fill;
	void *mapped_addr;
	u32 mmap_count;
	struct list_head list;
	};

	/* struct generic queue in linux kernel virtual memory (kv) */
	struct ipz_queue {
	u64 current_q_offset; /* current queue entry */

	struct ipz_page *queue_pages; / array of pages belonging to queue */
	u32 qe_size; /* queue entry size */
	u32 act_nr_of_sg;
	u32 queue_length; /* queue length allocated in bytes */
	u32 pagesize;
	u32 toggle_state; /* toggle flag - per page */
	u32 offset; /* save offset within page for small_qp */
	struct ipz_small_queue_page *small_page;
	};

	/*
	* return current Queue Entry for a certain q_offset
	* returns address (kv) of Queue Entry
	*/
	static inline void ipz_qeit_calc(struct ipz_queue queue, u64 q_offset)
	{
	struct ipz_page *current_page;
	if (q_offset >= queue->queue_length)
	return NULL;
	current_page = (queue->queue_pages)[q_offset >> EHCA_PAGESHIFT];
	return &current_page->entries[q_offset & (EHCA_PAGESIZE - 1)];
	}

	/*
	* return current Queue Entry
	* returns address (kv) of Queue Entry
	*/
	static inline void ipz_qeit_get(struct ipz_queue queue)
	{
	return ipz_qeit_calc(queue, queue->current_q_offset);
	}

	/*
	* return current Queue Page , increment Queue Page iterator from
	* page to page in struct ipz_queue, last increment will return 0! and
	* NOT wrap
	* returns address (kv) of Queue Page
	* warning don't use in parallel with ipz_QE_get_inc()
	*/
	void ipz_qpageit_get_inc(struct ipz_queue queue);

	/*
	* return current Queue Entry, increment Queue Entry iterator by one
	* step in struct ipz_queue, will wrap in ringbuffer
	* returns address (kv) of Queue Entry BEFORE increment
	* warning don't use in parallel with ipz_qpageit_get_inc()
	*/
	static inline void ipz_qeit_get_inc(struct ipz_queue queue)
	{
	void *ret = ipz_qeit_get(queue);
	queue->current_q_offset += queue->qe_size;
	if (queue->current_q_offset >= queue->queue_length) {
	queue->current_q_offset = 0;
	/* toggle the valid flag */
	queue->toggle_state = (~queue->toggle_state) & 1;
	}

	return ret;
	}

	/*
	* return a bool indicating whether current Queue Entry is valid
	*/
	static inline int ipz_qeit_is_valid(struct ipz_queue *queue)
	{
	struct ehca_cqe *cqe = ipz_qeit_get(queue);
	return ((cqe->cqe_flags >> 7) == (queue->toggle_state & 1));
	}

	/*
	* return current Queue Entry, increment Queue Entry iterator by one
	* step in struct ipz_queue, will wrap in ringbuffer
	* returns address (kv) of Queue Entry BEFORE increment
	* returns 0 and does not increment, if wrong valid state
	* warning don't use in parallel with ipz_qpageit_get_inc()
	*/
	static inline void ipz_qeit_get_inc_valid(struct ipz_queue queue)
	{
	return ipz_qeit_is_valid(queue) ? ipz_qeit_get_inc(queue) : NULL;
	}

	/*
	* returns and resets Queue Entry iterator
	* returns address (kv) of first Queue Entry
	*/
	static inline void ipz_qeit_reset(struct ipz_queue queue)
	{
	queue->current_q_offset = 0;
	return ipz_qeit_get(queue);
	}

	/*
	* return the q_offset corresponding to an absolute address
	*/
	int ipz_queue_abs_to_offset(struct ipz_queue queue, u64 addr, u64 q_offset);

	/*
	* return the next queue offset. don't modify the queue.
	*/
	static inline u64 ipz_queue_advance_offset(struct ipz_queue *queue, u64 offset)
	{
	offset += queue->qe_size;
	if (offset >= queue->queue_length) offset = 0;
	return offset;
	}

	/* struct generic page table */
	struct ipz_pt {
	u64 entries[EHCA_PT_ENTRIES];
	};

	/* struct page table for a queue, only to be used in pf */
	struct ipz_qpt {
	/* queue page tables (kv), use u64 because we know the element length */
	u64 *qpts;
	u32 n_qpts;
	u32 n_ptes; /* number of page table entries */
	u64 *current_pte_addr;
	};

	/*
	* constructor for a ipz_queue_t, placement new for ipz_queue_t,
	* new for all dependent datastructors
	* all QP Tables are the same
	* flow:
	* allocate+pin queue
	* see ipz_qpt_ctor()
	* returns true if ok, false if out of memory
	*/
	int ipz_queue_ctor(struct ehca_pd pd, struct ipz_queue queue,
	const u32 nr_of_pages, const u32 pagesize,
	const u32 qe_size, const u32 nr_of_sg,
	int is_small);

	/*
	* destructor for a ipz_queue_t
	* -# free queue
	* see ipz_queue_ctor()
	* returns true if ok, false if queue was NULL-ptr of free failed
	*/
	int ipz_queue_dtor(struct ehca_pd pd, struct ipz_queue queue);

	/*
	* constructor for a ipz_qpt_t,
	* placement new for struct ipz_queue, new for all dependent datastructors
	* all QP Tables are the same,
	* flow:
	* -# allocate+pin queue
	* -# initialise ptcb
	* -# allocate+pin PTs
	* -# link PTs to a ring, according to HCA Arch, set bit62 id needed
	* -# the ring must have room for exactly nr_of_PTEs
	* see ipz_qpt_ctor()
	*/
	void ipz_qpt_ctor(struct ipz_qpt *qpt,
	const u32 nr_of_qes,
	const u32 pagesize,
	const u32 qe_size,
	const u8 lowbyte, const u8 toggle,
	u32 * act_nr_of_QEs, u32 * act_nr_of_pages);

	/*
	* return current Queue Entry, increment Queue Entry iterator by one
	* step in struct ipz_queue, will wrap in ringbuffer
	* returns address (kv) of Queue Entry BEFORE increment
	* warning don't use in parallel with ipz_qpageit_get_inc()
	* warning unpredictable results may occur if steps>act_nr_of_queue_entries
	* fix EQ page problems
	*/
	void ipz_qeit_eq_get_inc(struct ipz_queue queue);

	/*
	* return current Event Queue Entry, increment Queue Entry iterator
	* by one step in struct ipz_queue if valid, will wrap in ringbuffer
	* returns address (kv) of Queue Entry BEFORE increment
	* returns 0 and does not increment, if wrong valid state
	* warning don't use in parallel with ipz_queue_QPageit_get_inc()
	* warning unpredictable results may occur if steps>act_nr_of_queue_entries
	*/
	static inline void ipz_eqit_eq_get_inc_valid(struct ipz_queue queue)
	{
	void *ret = ipz_qeit_get(queue);
	u32 qe = (u8 )ret;
	if ((qe >> 7) != (queue->toggle_state & 1))
	return NULL;
	ipz_qeit_eq_get_inc(queue); /* this is a good one */
	return ret;
	}

	static inline void ipz_eqit_eq_peek_valid(struct ipz_queue queue)
	{
	void *ret = ipz_qeit_get(queue);
	u32 qe = (u8 )ret;
	if ((qe >> 7) != (queue->toggle_state & 1))
	return NULL;
	return ret;
	}

	/* returns address (GX) of first queue entry */
	static inline u64 ipz_qpt_get_firstpage(struct ipz_qpt *qpt)
	{
	return be64_to_cpu(qpt->qpts[0]);
	}

	/* returns address (kv) of first page of queue page table */
	static inline void ipz_qpt_get_qpt(struct ipz_qpt qpt)
	{
	return qpt->qpts;
	}

	#endif /* __IPZ_PT_FN_H__ */