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Subject[PATCH 14/22] ehca completion queue handling
Date
From: Roland Dreier <rolandd@cisco.com>


---

drivers/infiniband/hw/ehca/ehca_cq.c | 416 ++++++++++++++++++++++++++++++++++
1 files changed, 416 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 0000000..ebee9c3
--- /dev/null
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -0,0 +1,416 @@
+/*
+ * IBM eServer eHCA Infiniband device driver for Linux on POWER
+ *
+ * Completion queue handling
+ *
+ * Authors: Waleri Fomin <fomin@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.
+ *
+ * $Id: ehca_cq.c,v 1.61 2006/02/06 10:17:34 schickhj Exp $
+ */
+
+#define DEB_PREFIX "e_cq"
+
+#include "ehca_kernel.h"
+#include "ehca_common.h"
+#include "ehca_iverbs.h"
+#include "ehca_classes.h"
+#include "ehca_irq.h"
+#include "hcp_if.h"
+#include <linux/err.h>
+#include <asm/uaccess.h>
+
+#define HIPZ_CQ_REGISTER_ORIG 0
+
+int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp)
+{
+ unsigned int qp_num = qp->ehca_qp_core.real_qp_num;
+ unsigned int key = qp_num%QP_HASHTAB_LEN;
+ unsigned long spl_flags = 0;
+ spin_lock_irqsave(&cq->spinlock, spl_flags);
+ list_add(&qp->list_entries, &cq->qp_hashtab[key]);
+ spin_unlock_irqrestore(&cq->spinlock, spl_flags);
+ EDEB(7, "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;
+ struct list_head *iter = NULL;
+ struct ehca_qp *qp = NULL;
+ unsigned long spl_flags = 0;
+ spin_lock_irqsave(&cq->spinlock, spl_flags);
+ list_for_each(iter, &cq->qp_hashtab[key]) {
+ qp = list_entry(iter, struct ehca_qp, list_entries);
+ if (qp->ehca_qp_core.real_qp_num == real_qp_num) {
+ list_del(iter);
+ EDEB(7, "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!=0) {
+ EDEB_ERR(4, "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;
+ struct list_head *iter = NULL;
+ struct ehca_qp *qp = NULL;
+ list_for_each(iter, &cq->qp_hashtab[key]) {
+ qp = list_entry(iter, struct ehca_qp, list_entries);
+ if (qp->ehca_qp_core.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)
+{
+ struct ib_cq *cq = NULL;
+ struct ehca_cq *my_cq = NULL;
+ u32 number_of_entries = cqe;
+ struct ehca_shca *shca = NULL;
+ struct ipz_adapter_handle adapter_handle;
+ struct ipz_eq_handle eq_handle;
+ struct ipz_cq_handle *cq_handle_ref = NULL;
+ u32 act_nr_of_entries = 0;
+ u32 act_pages = 0;
+ u32 counter = 0;
+ void *vpage = NULL;
+ u64 rpage = 0;
+ struct h_galpa gal;
+ u64 CQx_FEC = 0;
+ u64 hipz_rc = H_Success;
+ int ipz_rc = 0;
+ int ret = 0;
+ const u32 additional_cqe=20;
+ int i= 0;
+
+ EHCA_CHECK_DEVICE_P(device);
+ EDEB_EN(7, "device=%p cqe=%x context=%p",
+ device, cqe, context);
+ /* cq's maximum depth is 4GB-64
+ * but we need additional 20 as buffer for receiving errors cqes
+ */
+ if (cqe>=0xFFFFFFFF-64-additional_cqe) {
+ return ERR_PTR(-EINVAL);
+ }
+ number_of_entries += additional_cqe;
+
+ my_cq = ehca_cq_new();
+ if (my_cq == NULL) {
+ cq = ERR_PTR(-ENOMEM);
+ EDEB_ERR(4,
+ "Out of memory for ehca_cq struct "
+ "device=%p", device);
+ goto create_cq_exit0;
+ }
+ cq = &my_cq->ib_cq;
+
+ shca = container_of(device, struct ehca_shca, ib_device);
+ adapter_handle = shca->ipz_hca_handle;
+ eq_handle = shca->eq.ipz_eq_handle;
+ cq_handle_ref = &my_cq->ipz_cq_handle;
+
+ do {
+ if (!idr_pre_get(&ehca_cq_idr, GFP_KERNEL)) {
+ cq = ERR_PTR(-ENOMEM);
+ EDEB_ERR(4,
+ "Can't reserve idr resources. "
+ "device=%p", device);
+ goto create_cq_exit1;
+ }
+
+ down_write(&ehca_cq_idr_sem);
+ ret = idr_get_new(&ehca_cq_idr, my_cq, &my_cq->token);
+ up_write(&ehca_cq_idr_sem);
+
+ } while (ret == -EAGAIN);
+
+ if (ret) {
+ cq = ERR_PTR(-ENOMEM);
+ EDEB_ERR(4,
+ "Can't allocate new idr entry. "
+ "device=%p", device);
+ goto create_cq_exit1;
+ }
+
+ hipz_rc = hipz_h_alloc_resource_cq(adapter_handle,
+ &my_cq->pf,
+ eq_handle,
+ my_cq->token,
+ number_of_entries,
+ cq_handle_ref,
+ &act_nr_of_entries,
+ &act_pages,
+ &my_cq->ehca_cq_core.galpas);
+ if (hipz_rc != H_Success) {
+ EDEB_ERR(4,
+ "hipz_h_alloc_resource_cq() failed "
+ "hipz_rc=%lx device=%p", hipz_rc, device);
+ cq = ERR_PTR(ehca2ib_return_code(hipz_rc));
+ goto create_cq_exit2;
+ }
+
+ ipz_rc =
+ ipz_queue_ctor(&my_cq->ehca_cq_core.ipz_queue, act_pages,
+ EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0);
+ if (!ipz_rc) {
+ EDEB_ERR(4,
+ "ipz_queue_ctor() failed "
+ "ipz_rc=%x device=%p", ipz_rc, device);
+ cq = ERR_PTR(-EINVAL);
+ goto create_cq_exit3;
+ }
+
+ for (counter = 0; counter < act_pages; counter++) {
+ vpage = ipz_QPageit_get_inc(&my_cq->ehca_cq_core.ipz_queue);
+ if (!vpage) {
+ EDEB_ERR(4, "ipz_QPageit_get_inc() "
+ "returns NULL device=%p", device);
+ cq = ERR_PTR(-EAGAIN);
+ goto create_cq_exit4;
+ }
+ rpage = ehca_kv_to_g(vpage);
+
+ hipz_rc = hipz_h_register_rpage_cq(adapter_handle,
+ my_cq->ipz_cq_handle,
+ &my_cq->pf,
+ 0,
+ HIPZ_CQ_REGISTER_ORIG,
+ rpage,
+ 1,
+ my_cq->ehca_cq_core.galpas.
+ kernel);
+
+ if (hipz_rc < H_Success) {
+ EDEB_ERR(4, "hipz_h_register_rpage_cq() failed "
+ "ehca_cq=%p cq_num=%x hipz_rc=%lx "
+ "counter=%i act_pages=%i",
+ my_cq, my_cq->cq_number,
+ hipz_rc, counter, act_pages);
+ cq = ERR_PTR(-EINVAL);
+ goto create_cq_exit4;
+ }
+
+ if (counter == (act_pages - 1)) {
+ vpage = ipz_QPageit_get_inc(
+ &my_cq->ehca_cq_core.ipz_queue);
+ if ((hipz_rc != H_Success) || (vpage != 0)) {
+ EDEB_ERR(4, "Registration of pages not "
+ "complete ehca_cq=%p cq_num=%x "
+ "hipz_rc=%lx",
+ my_cq, my_cq->cq_number, hipz_rc);
+ cq = ERR_PTR(-EAGAIN);
+ goto create_cq_exit4;
+ }
+ } else {
+ if (hipz_rc != H_PAGE_REGISTERED) {
+ EDEB_ERR(4, "Registration of page failed "
+ "ehca_cq=%p cq_num=%x hipz_rc=%lx"
+ "counter=%i act_pages=%i",
+ my_cq, my_cq->cq_number,
+ hipz_rc, counter, act_pages);
+ cq = ERR_PTR(-ENOMEM);
+ goto create_cq_exit4;
+ }
+ }
+ }
+
+ ipz_QEit_reset(&my_cq->ehca_cq_core.ipz_queue);
+
+ gal = my_cq->ehca_cq_core.galpas.kernel;
+ CQx_FEC = hipz_galpa_load(gal, CQTEMM_OFFSET(CQx_FEC));
+ EDEB(8, "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 =
+ 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_LIST_HEAD(&my_cq->qp_hashtab[i]);
+ }
+
+ if (context) {
+ struct ehca_create_cq_resp resp;
+ struct vm_area_struct * vma;
+ resp.cq_number = my_cq->cq_number;
+ resp.token = my_cq->token;
+ resp.ehca_cq_core = my_cq->ehca_cq_core;
+
+ ehca_mmap_nopage(((u64) (my_cq->token) << 32) | 0x12000000,
+ my_cq->ehca_cq_core.ipz_queue.queue_length,
+ ((void**)&resp.ehca_cq_core.ipz_queue.queue),
+ &vma);
+ my_cq->uspace_queue = (u64)resp.ehca_cq_core.ipz_queue.queue;
+ ehca_mmap_register(my_cq->ehca_cq_core.galpas.user.fw_handle,
+ ((void**)&resp.ehca_cq_core.galpas.kernel.fw_handle),
+ &vma);
+ my_cq->uspace_fwh = (u64)resp.ehca_cq_core.galpas.kernel.fw_handle;
+ if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
+ EDEB_ERR(4, "Copy to udata failed.");
+ goto create_cq_exit4;
+ }
+ }
+
+ EDEB_EX(7,"retcode=%p ehca_cq=%p cq_num=%x cq_size=%x",
+ cq, my_cq, my_cq->cq_number, act_nr_of_entries);
+ return cq;
+
+ create_cq_exit4:
+ ipz_queue_dtor(&my_cq->ehca_cq_core.ipz_queue);
+
+ create_cq_exit3:
+ hipz_rc = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
+ EDEB(3, "hipz_h_destroy_cq() failed ehca_cq=%p cq_num=%x hipz_rc=%lx",
+ my_cq, my_cq->cq_number, hipz_rc);
+
+ create_cq_exit2:
+ /* dereg idr */
+ down_write(&ehca_cq_idr_sem);
+ idr_remove(&ehca_cq_idr, my_cq->token);
+ up_write(&ehca_cq_idr_sem);
+
+ create_cq_exit1:
+ /* free cq struct */
+ ehca_cq_delete(my_cq);
+
+ create_cq_exit0:
+ EDEB_EX(7, "An error has occured retcode=%p ", cq);
+ return cq;
+}
+
+int ehca_destroy_cq(struct ib_cq *cq)
+{
+ u64 hipz_rc = H_Success;
+ int retcode = 0;
+ struct ehca_cq *my_cq = NULL;
+ int cq_num = 0;
+ struct ib_device *device = NULL;
+ struct ehca_shca *shca = NULL;
+ struct ipz_adapter_handle adapter_handle;
+
+ EHCA_CHECK_CQ(cq);
+ my_cq = container_of(cq, struct ehca_cq, ib_cq);
+ cq_num = my_cq->cq_number;
+ device = cq->device;
+ EHCA_CHECK_DEVICE(device);
+ shca = container_of(device, struct ehca_shca, ib_device);
+ adapter_handle = shca->ipz_hca_handle;
+ EDEB_EN(7, "ehca_cq=%p cq_num=%x",
+ my_cq, my_cq->cq_number);
+
+ down_write(&ehca_cq_idr_sem);
+ idr_remove(&ehca_cq_idr, my_cq->token);
+ up_write(&ehca_cq_idr_sem);
+
+ /* un-mmap if vma alloc */
+ if (my_cq->uspace_queue!=0) {
+ struct ehca_cq_core *cq_core = &my_cq->ehca_cq_core;
+ retcode = ehca_munmap(my_cq->uspace_queue,
+ cq_core->ipz_queue.queue_length);
+ retcode = ehca_munmap(my_cq->uspace_fwh, 4096);
+ }
+
+ hipz_rc = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
+ if (hipz_rc == H_R_STATE) {
+ /* cq in err: read err data and destroy it forcibly */
+ EDEB(4, "ehca_cq=%p cq_num=%x ressource=%lx in err state. "
+ "Try to delete it forcibly.",
+ my_cq, my_cq->cq_number, my_cq->ipz_cq_handle.handle);
+ ehca_error_data(shca, my_cq->ipz_cq_handle.handle);
+ hipz_rc = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
+ if (hipz_rc == H_Success) {
+ EDEB(4, "ehca_cq=%p cq_num=%x deleted successfully.",
+ my_cq, my_cq->cq_number);
+ }
+ }
+ if (hipz_rc != H_Success) {
+ EDEB_ERR(4,"hipz_h_destroy_cq() failed "
+ "hipz_rc=%lx ehca_cq=%p cq_num=%x",
+ hipz_rc, my_cq, my_cq->cq_number);
+ retcode = ehca2ib_return_code(hipz_rc);
+ goto destroy_cq_exit0;/*@TODO*/
+ }
+ ipz_queue_dtor(&my_cq->ehca_cq_core.ipz_queue);
+ ehca_cq_delete(my_cq);
+
+ destroy_cq_exit0:
+ EDEB_EX(7, "ehca_cq=%p cq_num=%x retcode=%x ",
+ my_cq, cq_num, retcode);
+ return retcode;
+}
+
+int ehca_resize_cq(struct ib_cq *cq, int cqe)
+{
+ int retcode = 0;
+ struct ehca_cq *my_cq = NULL;
+
+ if (unlikely(NULL == cq)) {
+ EDEB_ERR(4, "cq is NULL");
+ return -EFAULT;
+ }
+
+ my_cq = container_of(cq, struct ehca_cq, ib_cq);
+ EDEB_EN(7, "ehca_cq=%p cq_num=%x",
+ my_cq, my_cq->cq_number);
+ /*TODO proper resize still needs to be done*/
+ if (cqe > cq->cqe) {
+ retcode = -EINVAL;
+ }
+ EDEB_EX(7, "ehca_cq=%p cq_num=%x",
+ my_cq, my_cq->cq_number);
+ return retcode;
+}
+
+/* eof ehca_cq.c */
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