150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/*
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* IBM eServer eHCA Infiniband device driver for Linux on POWER
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*
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* internal queue handling
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*
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* Authors: Waleri Fomin <fomin@de.ibm.com>
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* Reinhard Ernst <rernst@de.ibm.com>
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* Christoph Raisch <raisch@de.ibm.com>
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*
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* Copyright (c) 2005 IBM Corporation
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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_tools.h"
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#include "ipz_pt_fn.h"
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void *ipz_qpageit_get_inc(struct ipz_queue *queue)
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{
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void *ret = ipz_qeit_get(queue);
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queue->current_q_offset += queue->pagesize;
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if (queue->current_q_offset > queue->queue_length) {
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queue->current_q_offset -= queue->pagesize;
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ret = NULL;
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}
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if (((u64)ret) % EHCA_PAGESIZE) {
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ehca_gen_err("ERROR!! not at PAGE-Boundary");
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return NULL;
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}
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return ret;
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}
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void *ipz_qeit_eq_get_inc(struct ipz_queue *queue)
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{
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void *ret = ipz_qeit_get(queue);
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u64 last_entry_in_q = queue->queue_length - queue->qe_size;
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queue->current_q_offset += queue->qe_size;
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if (queue->current_q_offset > last_entry_in_q) {
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queue->current_q_offset = 0;
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queue->toggle_state = (~queue->toggle_state) & 1;
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}
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return ret;
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}
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int ipz_queue_ctor(struct ipz_queue *queue,
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const u32 nr_of_pages,
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const u32 pagesize, const u32 qe_size, const u32 nr_of_sg)
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{
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int pages_per_kpage = PAGE_SIZE >> EHCA_PAGESHIFT;
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int f;
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if (pagesize > PAGE_SIZE) {
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ehca_gen_err("FATAL ERROR: pagesize=%x is greater "
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"than kernel page size", pagesize);
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return 0;
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}
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if (!pages_per_kpage) {
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ehca_gen_err("FATAL ERROR: invalid kernel page size. "
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"pages_per_kpage=%x", pages_per_kpage);
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return 0;
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}
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queue->queue_length = nr_of_pages * pagesize;
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queue->queue_pages = vmalloc(nr_of_pages * sizeof(void *));
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if (!queue->queue_pages) {
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ehca_gen_err("ERROR!! didn't get the memory");
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return 0;
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}
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memset(queue->queue_pages, 0, nr_of_pages * sizeof(void *));
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/*
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* allocate pages for queue:
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* outer loop allocates whole kernel pages (page aligned) and
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* inner loop divides a kernel page into smaller hca queue pages
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*/
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f = 0;
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while (f < nr_of_pages) {
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u8 *kpage = (u8*)get_zeroed_page(GFP_KERNEL);
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int k;
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if (!kpage)
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goto ipz_queue_ctor_exit0; /*NOMEM*/
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for (k = 0; k < pages_per_kpage && f < nr_of_pages; k++) {
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(queue->queue_pages)[f] = (struct ipz_page *)kpage;
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kpage += EHCA_PAGESIZE;
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f++;
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}
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}
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queue->current_q_offset = 0;
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queue->qe_size = qe_size;
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queue->act_nr_of_sg = nr_of_sg;
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queue->pagesize = pagesize;
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queue->toggle_state = 1;
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return 1;
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ipz_queue_ctor_exit0:
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ehca_gen_err("Couldn't get alloc pages queue=%p f=%x nr_of_pages=%x",
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queue, f, nr_of_pages);
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for (f = 0; f < nr_of_pages; f += pages_per_kpage) {
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if (!(queue->queue_pages)[f])
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break;
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free_page((unsigned long)(queue->queue_pages)[f]);
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}
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return 0;
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}
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int ipz_queue_dtor(struct ipz_queue *queue)
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{
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int pages_per_kpage = PAGE_SIZE >> EHCA_PAGESHIFT;
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int g;
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int nr_pages;
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if (!queue || !queue->queue_pages) {
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ehca_gen_dbg("queue or queue_pages is NULL");
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return 0;
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}
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nr_pages = queue->queue_length / queue->pagesize;
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for (g = 0; g < nr_pages; g += pages_per_kpage)
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free_page((unsigned long)(queue->queue_pages)[g]);
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vfree(queue->queue_pages);
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return 1;
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}
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