IB/ehca: Deprecate driver, move to staging, schedule deletion

The ehca driver is only supported on IBM machines with a custom EBus.
As they have opted to build their newer machines using more industry
standard technology and haven't really been pushing EBus capable
machines for a while, this driver can now safely be moved to the
staging area and scheduled for eventual removal.  This plan was brought
to IBM's attention and received their sign-off.

Cc: alexs@linux.vnet.ibm.com
Cc: hnguyen@de.ibm.com
Cc: raisch@de.ibm.com
Cc: stefan.roscher@de.ibm.com
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 0 insertions, 397 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c
deleted file mode 100644
index 9b68b175069b..000000000000
--- a/drivers/infiniband/hw/ehca/ehca_cq.c
+++ /dev/null
@@ -1,397 +0,0 @@
-/*
- *  IBM eServer eHCA Infiniband device driver for Linux on POWER
- *
- *  Completion 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 <linux/slab.h>
-
-#include "ehca_iverbs.h"
-#include "ehca_classes.h"
-#include "ehca_irq.h"
-#include "hcp_if.h"
-
-static struct kmem_cache *cq_cache;
-
-int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp)
-{
-	unsigned int qp_num = qp->real_qp_num;
-	unsigned int key = qp_num & (QP_HASHTAB_LEN-1);
-	unsigned long flags;
-
-	spin_lock_irqsave(&cq->spinlock, flags);
-	hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
-	spin_unlock_irqrestore(&cq->spinlock, flags);
-
-	ehca_dbg(cq->ib_cq.device, "cq_num=%x real_qp_num=%x",
-		 cq->cq_number, qp_num);
-
-	return 0;
-}
-
-int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num)
-{
-	int ret = -EINVAL;
-	unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
-	struct hlist_node *iter;
-	struct ehca_qp *qp;
-	unsigned long flags;
-
-	spin_lock_irqsave(&cq->spinlock, flags);
-	hlist_for_each(iter, &cq->qp_hashtab[key]) {
-		qp = hlist_entry(iter, struct ehca_qp, list_entries);
-		if (qp->real_qp_num == real_qp_num) {
-			hlist_del(iter);
-			ehca_dbg(cq->ib_cq.device,
-				 "removed qp from cq .cq_num=%x real_qp_num=%x",
-				 cq->cq_number, real_qp_num);
-			ret = 0;
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&cq->spinlock, flags);
-	if (ret)
-		ehca_err(cq->ib_cq.device,
-			 "qp not found cq_num=%x real_qp_num=%x",
-			 cq->cq_number, real_qp_num);
-
-	return ret;
-}
-
-struct ehca_qp *ehca_cq_get_qp(struct ehca_cq *cq, int real_qp_num)
-{
-	struct ehca_qp *ret = NULL;
-	unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
-	struct hlist_node *iter;
-	struct ehca_qp *qp;
-	hlist_for_each(iter, &cq->qp_hashtab[key]) {
-		qp = hlist_entry(iter, struct ehca_qp, list_entries);
-		if (qp->real_qp_num == real_qp_num) {
-			ret = qp;
-			break;
-		}
-	}
-	return ret;
-}
-
-struct ib_cq *ehca_create_cq(struct ib_device *device,
-			     const struct ib_cq_init_attr *attr,
-			     struct ib_ucontext *context,
-			     struct ib_udata *udata)
-{
-	int cqe = attr->cqe;
-	static const u32 additional_cqe = 20;
-	struct ib_cq *cq;
-	struct ehca_cq *my_cq;
-	struct ehca_shca *shca =
-		container_of(device, struct ehca_shca, ib_device);
-	struct ipz_adapter_handle adapter_handle;
-	struct ehca_alloc_cq_parms param; /* h_call's out parameters */
-	struct h_galpa gal;
-	void *vpage;
-	u32 counter;
-	u64 rpage, cqx_fec, h_ret;
-	int ipz_rc, i;
-	unsigned long flags;
-
-	if (attr->flags)
-		return ERR_PTR(-EINVAL);
-
-	if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
-		return ERR_PTR(-EINVAL);
-
-	if (!atomic_add_unless(&shca->num_cqs, 1, shca->max_num_cqs)) {
-		ehca_err(device, "Unable to create CQ, max number of %i "
-			"CQs reached.", shca->max_num_cqs);
-		ehca_err(device, "To increase the maximum number of CQs "
-			"use the number_of_cqs module parameter.\n");
-		return ERR_PTR(-ENOSPC);
-	}
-
-	my_cq = kmem_cache_zalloc(cq_cache, GFP_KERNEL);
-	if (!my_cq) {
-		ehca_err(device, "Out of memory for ehca_cq struct device=%p",
-			 device);
-		atomic_dec(&shca->num_cqs);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	memset(&param, 0, sizeof(struct ehca_alloc_cq_parms));
-
-	spin_lock_init(&my_cq->spinlock);
-	spin_lock_init(&my_cq->cb_lock);
-	spin_lock_init(&my_cq->task_lock);
-	atomic_set(&my_cq->nr_events, 0);
-	init_waitqueue_head(&my_cq->wait_completion);
-
-	cq = &my_cq->ib_cq;
-
-	adapter_handle = shca->ipz_hca_handle;
-	param.eq_handle = shca->eq.ipz_eq_handle;
-
-	idr_preload(GFP_KERNEL);
-	write_lock_irqsave(&ehca_cq_idr_lock, flags);
-	my_cq->token = idr_alloc(&ehca_cq_idr, my_cq, 0, 0x2000000, GFP_NOWAIT);
-	write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
-	idr_preload_end();
-
-	if (my_cq->token < 0) {
-		cq = ERR_PTR(-ENOMEM);
-		ehca_err(device, "Can't allocate new idr entry. device=%p",
-			 device);
-		goto create_cq_exit1;
-	}
-
-	/*
-	 * CQs maximum depth is 4GB-64, but we need additional 20 as buffer
-	 * for receiving errors CQEs.
-	 */
-	param.nr_cqe = cqe + additional_cqe;
-	h_ret = hipz_h_alloc_resource_cq(adapter_handle, my_cq, &param);
-
-	if (h_ret != H_SUCCESS) {
-		ehca_err(device, "hipz_h_alloc_resource_cq() failed "
-			 "h_ret=%lli device=%p", h_ret, device);
-		cq = ERR_PTR(ehca2ib_return_code(h_ret));
-		goto create_cq_exit2;
-	}
-
-	ipz_rc = ipz_queue_ctor(NULL, &my_cq->ipz_queue, param.act_pages,
-				EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0, 0);
-	if (!ipz_rc) {
-		ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%i device=%p",
-			 ipz_rc, device);
-		cq = ERR_PTR(-EINVAL);
-		goto create_cq_exit3;
-	}
-
-	for (counter = 0; counter < param.act_pages; counter++) {
-		vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
-		if (!vpage) {
-			ehca_err(device, "ipz_qpageit_get_inc() "
-				 "returns NULL device=%p", device);
-			cq = ERR_PTR(-EAGAIN);
-			goto create_cq_exit4;
-		}
-		rpage = __pa(vpage);
-
-		h_ret = hipz_h_register_rpage_cq(adapter_handle,
-						 my_cq->ipz_cq_handle,
-						 &my_cq->pf,
-						 0,
-						 0,
-						 rpage,
-						 1,
-						 my_cq->galpas.
-						 kernel);
-
-		if (h_ret < H_SUCCESS) {
-			ehca_err(device, "hipz_h_register_rpage_cq() failed "
-				 "ehca_cq=%p cq_num=%x h_ret=%lli counter=%i "
-				 "act_pages=%i", my_cq, my_cq->cq_number,
-				 h_ret, counter, param.act_pages);
-			cq = ERR_PTR(-EINVAL);
-			goto create_cq_exit4;
-		}
-
-		if (counter == (param.act_pages - 1)) {
-			vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
-			if ((h_ret != H_SUCCESS) || vpage) {
-				ehca_err(device, "Registration of pages not "
-					 "complete ehca_cq=%p cq_num=%x "
-					 "h_ret=%lli", my_cq, my_cq->cq_number,
-					 h_ret);
-				cq = ERR_PTR(-EAGAIN);
-				goto create_cq_exit4;
-			}
-		} else {
-			if (h_ret != H_PAGE_REGISTERED) {
-				ehca_err(device, "Registration of page failed "
-					 "ehca_cq=%p cq_num=%x h_ret=%lli "
-					 "counter=%i act_pages=%i",
-					 my_cq, my_cq->cq_number,
-					 h_ret, counter, param.act_pages);
-				cq = ERR_PTR(-ENOMEM);
-				goto create_cq_exit4;
-			}
-		}
-	}
-
-	ipz_qeit_reset(&my_cq->ipz_queue);
-
-	gal = my_cq->galpas.kernel;
-	cqx_fec = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_fec));
-	ehca_dbg(device, "ehca_cq=%p cq_num=%x CQX_FEC=%llx",
-		 my_cq, my_cq->cq_number, cqx_fec);
-
-	my_cq->ib_cq.cqe = my_cq->nr_of_entries =
-		param.act_nr_of_entries - additional_cqe;
-	my_cq->cq_number = (my_cq->ipz_cq_handle.handle) & 0xffff;
-
-	for (i = 0; i < QP_HASHTAB_LEN; i++)
-		INIT_HLIST_HEAD(&my_cq->qp_hashtab[i]);
-
-	INIT_LIST_HEAD(&my_cq->sqp_err_list);
-	INIT_LIST_HEAD(&my_cq->rqp_err_list);
-
-	if (context) {
-		struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
-		struct ehca_create_cq_resp resp;
-		memset(&resp, 0, sizeof(resp));
-		resp.cq_number = my_cq->cq_number;
-		resp.token = my_cq->token;
-		resp.ipz_queue.qe_size = ipz_queue->qe_size;
-		resp.ipz_queue.act_nr_of_sg = ipz_queue->act_nr_of_sg;
-		resp.ipz_queue.queue_length = ipz_queue->queue_length;
-		resp.ipz_queue.pagesize = ipz_queue->pagesize;
-		resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
-		resp.fw_handle_ofs = (u32)
-			(my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1));
-		if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
-			ehca_err(device, "Copy to udata failed.");
-			cq = ERR_PTR(-EFAULT);
-			goto create_cq_exit4;
-		}
-	}
-
-	return cq;
-
-create_cq_exit4:
-	ipz_queue_dtor(NULL, &my_cq->ipz_queue);
-
-create_cq_exit3:
-	h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
-	if (h_ret != H_SUCCESS)
-		ehca_err(device, "hipz_h_destroy_cq() failed ehca_cq=%p "
-			 "cq_num=%x h_ret=%lli", my_cq, my_cq->cq_number, h_ret);
-
-create_cq_exit2:
-	write_lock_irqsave(&ehca_cq_idr_lock, flags);
-	idr_remove(&ehca_cq_idr, my_cq->token);
-	write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
-
-create_cq_exit1:
-	kmem_cache_free(cq_cache, my_cq);
-
-	atomic_dec(&shca->num_cqs);
-	return cq;
-}
-
-int ehca_destroy_cq(struct ib_cq *cq)
-{
-	u64 h_ret;
-	struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
-	int cq_num = my_cq->cq_number;
-	struct ib_device *device = cq->device;
-	struct ehca_shca *shca = container_of(device, struct ehca_shca,
-					      ib_device);
-	struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
-	unsigned long flags;
-
-	if (cq->uobject) {
-		if (my_cq->mm_count_galpa || my_cq->mm_count_queue) {
-			ehca_err(device, "Resources still referenced in "
-				 "user space cq_num=%x", my_cq->cq_number);
-			return -EINVAL;
-		}
-	}
-
-	/*
-	 * remove the CQ from the idr first to make sure
-	 * no more interrupt tasklets will touch this CQ
-	 */
-	write_lock_irqsave(&ehca_cq_idr_lock, flags);
-	idr_remove(&ehca_cq_idr, my_cq->token);
-	write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
-
-	/* now wait until all pending events have completed */
-	wait_event(my_cq->wait_completion, !atomic_read(&my_cq->nr_events));
-
-	/* nobody's using our CQ any longer -- we can destroy it */
-	h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
-	if (h_ret == H_R_STATE) {
-		/* cq in err: read err data and destroy it forcibly */
-		ehca_dbg(device, "ehca_cq=%p cq_num=%x resource=%llx in err "
-			 "state. Try to delete it forcibly.",
-			 my_cq, cq_num, my_cq->ipz_cq_handle.handle);
-		ehca_error_data(shca, my_cq, my_cq->ipz_cq_handle.handle);
-		h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
-		if (h_ret == H_SUCCESS)
-			ehca_dbg(device, "cq_num=%x deleted successfully.",
-				 cq_num);
-	}
-	if (h_ret != H_SUCCESS) {
-		ehca_err(device, "hipz_h_destroy_cq() failed h_ret=%lli "
-			 "ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
-		return ehca2ib_return_code(h_ret);
-	}
-	ipz_queue_dtor(NULL, &my_cq->ipz_queue);
-	kmem_cache_free(cq_cache, my_cq);
-
-	atomic_dec(&shca->num_cqs);
-	return 0;
-}
-
-int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
-{
-	/* TODO: proper resize needs to be done */
-	ehca_err(cq->device, "not implemented yet");
-
-	return -EFAULT;
-}
-
-int ehca_init_cq_cache(void)
-{
-	cq_cache = kmem_cache_create("ehca_cache_cq",
-				     sizeof(struct ehca_cq), 0,
-				     SLAB_HWCACHE_ALIGN,
-				     NULL);
-	if (!cq_cache)
-		return -ENOMEM;
-	return 0;
-}
-
-void ehca_cleanup_cq_cache(void)
-{
-	if (cq_cache)
-		kmem_cache_destroy(cq_cache);
-}