[mirror_ubuntu-zesty-kernel.git] / drivers / staging / rdma / ehca / ehca_eq.c

/*
 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
 *
 *  Event queue handling
 *
 *  Authors: Waleri Fomin <fomin@de.ibm.com>
 *           Khadija Souissi <souissi@de.ibm.com>
 *           Reinhard Ernst <rernst@de.ibm.com>
 *           Heiko J Schick <schickhj@de.ibm.com>
 *           Hoang-Nam Nguyen <hnguyen@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.
 */

#include "ehca_classes.h"
#include "ehca_irq.h"
#include "ehca_iverbs.h"
#include "ehca_qes.h"
#include "hcp_if.h"
#include "ipz_pt_fn.h"

int ehca_create_eq(struct ehca_shca *shca,
		   struct ehca_eq *eq,
		   const enum ehca_eq_type type, const u32 length)
{
	int ret;
	u64 h_ret;
	u32 nr_pages;
	u32 i;
	void *vpage;
	struct ib_device *ib_dev = &shca->ib_device;

	spin_lock_init(&eq->spinlock);
	spin_lock_init(&eq->irq_spinlock);
	eq->is_initialized = 0;

	if (type != EHCA_EQ && type != EHCA_NEQ) {
		ehca_err(ib_dev, "Invalid EQ type %x. eq=%p", type, eq);
		return -EINVAL;
	}
	if (!length) {
		ehca_err(ib_dev, "EQ length must not be zero. eq=%p", eq);
		return -EINVAL;
	}

	h_ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
					 &eq->pf,
					 type,
					 length,
					 &eq->ipz_eq_handle,
					 &eq->length,
					 &nr_pages, &eq->ist);

	if (h_ret != H_SUCCESS) {
		ehca_err(ib_dev, "Can't allocate EQ/NEQ. eq=%p", eq);
		return -EINVAL;
	}

	ret = ipz_queue_ctor(NULL, &eq->ipz_queue, nr_pages,
			     EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0, 0);
	if (!ret) {
		ehca_err(ib_dev, "Can't allocate EQ pages eq=%p", eq);
		goto create_eq_exit1;
	}

	for (i = 0; i < nr_pages; i++) {
		u64 rpage;

		vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
		if (!vpage)
			goto create_eq_exit2;

		rpage = __pa(vpage);
		h_ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
						 eq->ipz_eq_handle,
						 &eq->pf,
						 0, 0, rpage, 1);

		if (i == (nr_pages - 1)) {
			/* last page */
			vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
			if (h_ret != H_SUCCESS || vpage)
				goto create_eq_exit2;
		} else {
			if (h_ret != H_PAGE_REGISTERED)
				goto create_eq_exit2;
		}
	}

	ipz_qeit_reset(&eq->ipz_queue);

	/* register interrupt handlers and initialize work queues */
	if (type == EHCA_EQ) {
		tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);

		ret = ibmebus_request_irq(eq->ist, ehca_interrupt_eq,
					  0, "ehca_eq",
					  (void *)shca);
		if (ret < 0)
			ehca_err(ib_dev, "Can't map interrupt handler.");
	} else if (type == EHCA_NEQ) {
		tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);

		ret = ibmebus_request_irq(eq->ist, ehca_interrupt_neq,
					  0, "ehca_neq",
					  (void *)shca);
		if (ret < 0)
			ehca_err(ib_dev, "Can't map interrupt handler.");
	}

	eq->is_initialized = 1;

	return 0;

create_eq_exit2:
	ipz_queue_dtor(NULL, &eq->ipz_queue);

create_eq_exit1:
	hipz_h_destroy_eq(shca->ipz_hca_handle, eq);

	return -EINVAL;
}

void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
{
	unsigned long flags;
	void *eqe;

	spin_lock_irqsave(&eq->spinlock, flags);
	eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
	spin_unlock_irqrestore(&eq->spinlock, flags);

	return eqe;
}

int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
{
	unsigned long flags;
	u64 h_ret;

	ibmebus_free_irq(eq->ist, (void *)shca);

	spin_lock_irqsave(&shca_list_lock, flags);
	eq->is_initialized = 0;
	spin_unlock_irqrestore(&shca_list_lock, flags);

	tasklet_kill(&eq->interrupt_task);

	h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);

	if (h_ret != H_SUCCESS) {
		ehca_err(&shca->ib_device, "Can't free EQ resources.");
		return -EINVAL;
	}
	ipz_queue_dtor(NULL, &eq->ipz_queue);

	return 0;
}
Commit	Line	Data
fab97220 HS	1	/*
	2	* IBM eServer eHCA Infiniband device driver for Linux on POWER
	3	*
	4	* Event queue handling
	5	*
	6	* Authors: Waleri Fomin <fomin@de.ibm.com>
	7	* Khadija Souissi <souissi@de.ibm.com>
	8	* Reinhard Ernst <rernst@de.ibm.com>
	9	* Heiko J Schick <schickhj@de.ibm.com>
	10	* Hoang-Nam Nguyen <hnguyen@de.ibm.com>
	11	*
	12	*
	13	* Copyright (c) 2005 IBM Corporation
	14	*
	15	* All rights reserved.
	16	*
	17	* This source code is distributed under a dual license of GPL v2.0 and OpenIB
	18	* BSD.
	19	*
	20	* OpenIB BSD License
	21	*
	22	* Redistribution and use in source and binary forms, with or without
	23	* modification, are permitted provided that the following conditions are met:
	24	*
	25	* Redistributions of source code must retain the above copyright notice, this
	26	* list of conditions and the following disclaimer.
	27	*
	28	* Redistributions in binary form must reproduce the above copyright notice,
	29	* this list of conditions and the following disclaimer in the documentation
	30	* and/or other materials
	31	* provided with the distribution.
	32	*
	33	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	34	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	35	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	36	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	37	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	38	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	39	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	40	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
	41	* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	42	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	43	* POSSIBILITY OF SUCH DAMAGE.
	44	*/
	45
	46	#include "ehca_classes.h"
	47	#include "ehca_irq.h"
	48	#include "ehca_iverbs.h"
	49	#include "ehca_qes.h"
	50	#include "hcp_if.h"
	51	#include "ipz_pt_fn.h"
	52
	53	int ehca_create_eq(struct ehca_shca *shca,
	54	struct ehca_eq *eq,
	55	const enum ehca_eq_type type, const u32 length)
	56	{
7df109d9 HNN	57	int ret;
7df109d9 HNN	58	u64 h_ret;
fab97220 HS	59	u32 nr_pages;
	60	u32 i;
	61	void *vpage;
	62	struct ib_device *ib_dev = &shca->ib_device;
	63
	64	spin_lock_init(&eq->spinlock);
78d8d5f9	65	spin_lock_init(&eq->irq_spinlock);
fab97220 HS	66	eq->is_initialized = 0;
	67
	68	if (type != EHCA_EQ && type != EHCA_NEQ) {
	69	ehca_err(ib_dev, "Invalid EQ type %x. eq=%p", type, eq);
	70	return -EINVAL;
	71	}
	72	if (!length) {
	73	ehca_err(ib_dev, "EQ length must not be zero. eq=%p", eq);
	74	return -EINVAL;
	75	}
	76
7df109d9 HNN	77	h_ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
	78	&eq->pf,
	79	type,
	80	length,
	81	&eq->ipz_eq_handle,
	82	&eq->length,
	83	&nr_pages, &eq->ist);
fab97220	84
7df109d9	85	if (h_ret != H_SUCCESS) {
fab97220 HS	86	ehca_err(ib_dev, "Can't allocate EQ/NEQ. eq=%p", eq);
	87	return -EINVAL;
	88	}
	89
e2f81daf SR	90	ret = ipz_queue_ctor(NULL, &eq->ipz_queue, nr_pages,
e2f81daf SR	91	EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0, 0);
fab97220 HS	92	if (!ret) {
	93	ehca_err(ib_dev, "Can't allocate EQ pages eq=%p", eq);
	94	goto create_eq_exit1;
	95	}
	96
	97	for (i = 0; i < nr_pages; i++) {
	98	u64 rpage;
	99
2b94397a	100	vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
7df109d9	101	if (!vpage)
fab97220	102	goto create_eq_exit2;
fab97220	103
b4b8d1e4	104	rpage = __pa(vpage);
7df109d9 HNN	105	h_ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
	106	eq->ipz_eq_handle,
	107	&eq->pf,
	108	0, 0, rpage, 1);
fab97220 HS	109
	110	if (i == (nr_pages - 1)) {
	111	/* last page */
	112	vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
7df109d9	113	if (h_ret != H_SUCCESS \|\| vpage)
fab97220 HS	114	goto create_eq_exit2;
fab97220 HS	115	} else {
139cdab0	116	if (h_ret != H_PAGE_REGISTERED)
fab97220 HS	117	goto create_eq_exit2;
	118	}
	119	}
	120
	121	ipz_qeit_reset(&eq->ipz_queue);
	122
	123	/* register interrupt handlers and initialize work queues */
	124	if (type == EHCA_EQ) {
bd5d0ccb AS	125	tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
bd5d0ccb AS	126
6b08f3ae	127	ret = ibmebus_request_irq(eq->ist, ehca_interrupt_eq,
10889a36	128	0, "ehca_eq",
fab97220 HS	129	(void *)shca);
	130	if (ret < 0)
	131	ehca_err(ib_dev, "Can't map interrupt handler.");
fab97220	132	} else if (type == EHCA_NEQ) {
bd5d0ccb AS	133	tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
bd5d0ccb AS	134
6b08f3ae	135	ret = ibmebus_request_irq(eq->ist, ehca_interrupt_neq,
10889a36	136	0, "ehca_neq",
fab97220 HS	137	(void *)shca);
	138	if (ret < 0)
	139	ehca_err(ib_dev, "Can't map interrupt handler.");
fab97220 HS	140	}
	141
	142	eq->is_initialized = 1;
	143
	144	return 0;
	145
	146	create_eq_exit2:
e2f81daf	147	ipz_queue_dtor(NULL, &eq->ipz_queue);
fab97220 HS	148
	149	create_eq_exit1:
	150	hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
	151
	152	return -EINVAL;
	153	}
	154
	155	void ehca_poll_eq(struct ehca_shca shca, struct ehca_eq *eq)
	156	{
	157	unsigned long flags;
	158	void *eqe;
	159
	160	spin_lock_irqsave(&eq->spinlock, flags);
	161	eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
	162	spin_unlock_irqrestore(&eq->spinlock, flags);
	163
	164	return eqe;
	165	}
	166
	167	int ehca_destroy_eq(struct ehca_shca shca, struct ehca_eq eq)
	168	{
	169	unsigned long flags;
	170	u64 h_ret;
	171
6b08f3ae	172	ibmebus_free_irq(eq->ist, (void *)shca);
fab97220	173
94202694 AS	174	spin_lock_irqsave(&shca_list_lock, flags);
	175	eq->is_initialized = 0;
	176	spin_unlock_irqrestore(&shca_list_lock, flags);
fab97220	177
94202694 AS	178	tasklet_kill(&eq->interrupt_task);
	179
	180	h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
fab97220 HS	181
	182	if (h_ret != H_SUCCESS) {
	183	ehca_err(&shca->ib_device, "Can't free EQ resources.");
	184	return -EINVAL;
	185	}
e2f81daf	186	ipz_queue_dtor(NULL, &eq->ipz_queue);
fab97220 HS	187
	188	return 0;
	189	}