![Alexander Schmidt](/assets/img/avatar_default.png)
Initialize tasklet before interrupts are requested to prevent scheduling of an uninitialized tasklet. Signed-off-by: Alexander Schmidt <alexs@linux.vnet.ibm.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
190 lines
5 KiB
C
190 lines
5 KiB
C
/*
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* IBM eServer eHCA Infiniband device driver for Linux on POWER
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*
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* Event queue handling
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*
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* Authors: Waleri Fomin <fomin@de.ibm.com>
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* Khadija Souissi <souissi@de.ibm.com>
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* Reinhard Ernst <rernst@de.ibm.com>
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* Heiko J Schick <schickhj@de.ibm.com>
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* Hoang-Nam Nguyen <hnguyen@de.ibm.com>
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*
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*
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* Copyright (c) 2005 IBM Corporation
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*
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* All rights reserved.
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*
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* This source code is distributed under a dual license of GPL v2.0 and OpenIB
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* BSD.
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*
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* OpenIB BSD License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ehca_classes.h"
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#include "ehca_irq.h"
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#include "ehca_iverbs.h"
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#include "ehca_qes.h"
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#include "hcp_if.h"
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#include "ipz_pt_fn.h"
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int ehca_create_eq(struct ehca_shca *shca,
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struct ehca_eq *eq,
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const enum ehca_eq_type type, const u32 length)
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{
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int ret;
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u64 h_ret;
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u32 nr_pages;
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u32 i;
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void *vpage;
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struct ib_device *ib_dev = &shca->ib_device;
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spin_lock_init(&eq->spinlock);
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spin_lock_init(&eq->irq_spinlock);
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eq->is_initialized = 0;
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if (type != EHCA_EQ && type != EHCA_NEQ) {
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ehca_err(ib_dev, "Invalid EQ type %x. eq=%p", type, eq);
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return -EINVAL;
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}
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if (!length) {
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ehca_err(ib_dev, "EQ length must not be zero. eq=%p", eq);
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return -EINVAL;
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}
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h_ret = hipz_h_alloc_resource_eq(shca->ipz_hca_handle,
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&eq->pf,
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type,
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length,
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&eq->ipz_eq_handle,
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&eq->length,
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&nr_pages, &eq->ist);
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if (h_ret != H_SUCCESS) {
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ehca_err(ib_dev, "Can't allocate EQ/NEQ. eq=%p", eq);
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return -EINVAL;
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}
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ret = ipz_queue_ctor(NULL, &eq->ipz_queue, nr_pages,
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EHCA_PAGESIZE, sizeof(struct ehca_eqe), 0, 0);
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if (!ret) {
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ehca_err(ib_dev, "Can't allocate EQ pages eq=%p", eq);
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goto create_eq_exit1;
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}
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for (i = 0; i < nr_pages; i++) {
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u64 rpage;
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vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
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if (!vpage)
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goto create_eq_exit2;
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rpage = virt_to_abs(vpage);
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h_ret = hipz_h_register_rpage_eq(shca->ipz_hca_handle,
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eq->ipz_eq_handle,
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&eq->pf,
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0, 0, rpage, 1);
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if (i == (nr_pages - 1)) {
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/* last page */
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vpage = ipz_qpageit_get_inc(&eq->ipz_queue);
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if (h_ret != H_SUCCESS || vpage)
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goto create_eq_exit2;
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} else {
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if (h_ret != H_PAGE_REGISTERED)
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goto create_eq_exit2;
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}
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}
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ipz_qeit_reset(&eq->ipz_queue);
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/* register interrupt handlers and initialize work queues */
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if (type == EHCA_EQ) {
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tasklet_init(&eq->interrupt_task, ehca_tasklet_eq, (long)shca);
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ret = ibmebus_request_irq(eq->ist, ehca_interrupt_eq,
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IRQF_DISABLED, "ehca_eq",
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(void *)shca);
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if (ret < 0)
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ehca_err(ib_dev, "Can't map interrupt handler.");
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} else if (type == EHCA_NEQ) {
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tasklet_init(&eq->interrupt_task, ehca_tasklet_neq, (long)shca);
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ret = ibmebus_request_irq(eq->ist, ehca_interrupt_neq,
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IRQF_DISABLED, "ehca_neq",
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(void *)shca);
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if (ret < 0)
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ehca_err(ib_dev, "Can't map interrupt handler.");
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}
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eq->is_initialized = 1;
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return 0;
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create_eq_exit2:
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ipz_queue_dtor(NULL, &eq->ipz_queue);
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create_eq_exit1:
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hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
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return -EINVAL;
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}
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void *ehca_poll_eq(struct ehca_shca *shca, struct ehca_eq *eq)
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{
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unsigned long flags;
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void *eqe;
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spin_lock_irqsave(&eq->spinlock, flags);
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eqe = ipz_eqit_eq_get_inc_valid(&eq->ipz_queue);
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spin_unlock_irqrestore(&eq->spinlock, flags);
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return eqe;
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}
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int ehca_destroy_eq(struct ehca_shca *shca, struct ehca_eq *eq)
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{
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unsigned long flags;
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u64 h_ret;
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ibmebus_free_irq(eq->ist, (void *)shca);
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spin_lock_irqsave(&shca_list_lock, flags);
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eq->is_initialized = 0;
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spin_unlock_irqrestore(&shca_list_lock, flags);
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tasklet_kill(&eq->interrupt_task);
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h_ret = hipz_h_destroy_eq(shca->ipz_hca_handle, eq);
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if (h_ret != H_SUCCESS) {
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ehca_err(&shca->ib_device, "Can't free EQ resources.");
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return -EINVAL;
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}
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ipz_queue_dtor(NULL, &eq->ipz_queue);
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return 0;
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}
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