IB/ehca: Add driver for IBM eHCA InfiniBand adapters

Add a driver for IBM GX bus InfiniBand adapters, which are usable with
some pSeries/System p systems.

Signed-off-by: Heiko J Schick <schickhj.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 427 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c
new file mode 100644
index 000000000000..458fe19648a1
--- /dev/null
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -0,0 +1,427 @@
+/*
+ *  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 <asm/current.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 spl_flags;
+
+	spin_lock_irqsave(&cq->spinlock, spl_flags);
+	hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
+	spin_unlock_irqrestore(&cq->spinlock, spl_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 spl_flags;
+
+	spin_lock_irqsave(&cq->spinlock, spl_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, spl_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, int cqe,
+			     struct ib_ucontext *context,
+			     struct ib_udata *udata)
+{
+	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, ret, i;
+	unsigned long flags;
+
+	if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
+		return ERR_PTR(-EINVAL);
+
+	my_cq = kmem_cache_alloc(cq_cache, SLAB_KERNEL);
+	if (!my_cq) {
+		ehca_err(device, "Out of memory for ehca_cq struct device=%p",
+			 device);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	memset(my_cq, 0, sizeof(struct ehca_cq));
+	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);
+	my_cq->ownpid = current->tgid;
+
+	cq = &my_cq->ib_cq;
+
+	adapter_handle = shca->ipz_hca_handle;
+	param.eq_handle = shca->eq.ipz_eq_handle;
+
+	do {
+		if (!idr_pre_get(&ehca_cq_idr, GFP_KERNEL)) {
+			cq = ERR_PTR(-ENOMEM);
+			ehca_err(device, "Can't reserve idr nr. device=%p",
+				 device);
+			goto create_cq_exit1;
+		}
+
+		spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+		ret = idr_get_new(&ehca_cq_idr, my_cq, &my_cq->token);
+		spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+
+	} while (ret == -EAGAIN);
+
+	if (ret) {
+		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=%lx device=%p", h_ret, device);
+		cq = ERR_PTR(ehca2ib_return_code(h_ret));
+		goto create_cq_exit2;
+	}
+
+	ipz_rc = ipz_queue_ctor(&my_cq->ipz_queue, param.act_pages,
+				EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0);
+	if (!ipz_rc) {
+		ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%x 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 = virt_to_abs(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=%lx 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=%lx", 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=%lx"
+					 "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=%lx",
+		 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]);
+
+	if (context) {
+		struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
+		struct ehca_create_cq_resp resp;
+		struct vm_area_struct *vma;
+		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;
+		ret = ehca_mmap_nopage(((u64)(my_cq->token) << 32) | 0x12000000,
+				       ipz_queue->queue_length,
+				       (void**)&resp.ipz_queue.queue,
+				       &vma);
+		if (ret) {
+			ehca_err(device, "Could not mmap queue pages");
+			cq = ERR_PTR(ret);
+			goto create_cq_exit4;
+		}
+		my_cq->uspace_queue = resp.ipz_queue.queue;
+		resp.galpas = my_cq->galpas;
+		ret = ehca_mmap_register(my_cq->galpas.user.fw_handle,
+					 (void**)&resp.galpas.kernel.fw_handle,
+					 &vma);
+		if (ret) {
+			ehca_err(device, "Could not mmap fw_handle");
+			cq = ERR_PTR(ret);
+			goto create_cq_exit5;
+		}
+		my_cq->uspace_fwh = (u64)resp.galpas.kernel.fw_handle;
+		if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
+			ehca_err(device, "Copy to udata failed.");
+			goto create_cq_exit6;
+		}
+	}
+
+	return cq;
+
+create_cq_exit6:
+	ehca_munmap(my_cq->uspace_fwh, EHCA_PAGESIZE);
+
+create_cq_exit5:
+	ehca_munmap(my_cq->uspace_queue, my_cq->ipz_queue.queue_length);
+
+create_cq_exit4:
+	ipz_queue_dtor(&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=%lx", my_cq, my_cq->cq_number, h_ret);
+
+create_cq_exit2:
+	spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+	idr_remove(&ehca_cq_idr, my_cq->token);
+	spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+
+create_cq_exit1:
+	kmem_cache_free(cq_cache, my_cq);
+
+	return cq;
+}
+
+int ehca_destroy_cq(struct ib_cq *cq)
+{
+	u64 h_ret;
+	int 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;
+	u32 cur_pid = current->tgid;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+	while (my_cq->nr_callbacks)
+		yield();
+
+	idr_remove(&ehca_cq_idr, my_cq->token);
+	spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+
+	if (my_cq->uspace_queue && my_cq->ownpid != cur_pid) {
+		ehca_err(device, "Invalid caller pid=%x ownpid=%x",
+			 cur_pid, my_cq->ownpid);
+		return -EINVAL;
+	}
+
+	/* un-mmap if vma alloc */
+	if (my_cq->uspace_queue ) {
+		ret = ehca_munmap(my_cq->uspace_queue,
+				  my_cq->ipz_queue.queue_length);
+		if (ret)
+			ehca_err(device, "Could not munmap queue ehca_cq=%p "
+				 "cq_num=%x", my_cq, cq_num);
+		ret = ehca_munmap(my_cq->uspace_fwh, EHCA_PAGESIZE);
+		if (ret)
+			ehca_err(device, "Could not munmap fwh ehca_cq=%p "
+				 "cq_num=%x", my_cq, cq_num);
+	}
+
+	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 ressource=%lx 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=%lx "
+			 "ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
+		return ehca2ib_return_code(h_ret);
+	}
+	ipz_queue_dtor(&my_cq->ipz_queue);
+	kmem_cache_free(cq_cache, my_cq);
+
+	return 0;
+}
+
+int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
+{
+	struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
+	u32 cur_pid = current->tgid;
+
+	if (my_cq->uspace_queue && my_cq->ownpid != cur_pid) {
+		ehca_err(cq->device, "Invalid caller pid=%x ownpid=%x",
+			 cur_pid, my_cq->ownpid);
+		return -EINVAL;
+	}
+
+	/* 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, NULL);
+	if (!cq_cache)
+		return -ENOMEM;
+	return 0;
+}
+
+void ehca_cleanup_cq_cache(void)
+{
+	if (cq_cache)
+		kmem_cache_destroy(cq_cache);
+}