128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/*
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* Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of EITHER the GNU General Public License
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* version 2 as published by the Free Software Foundation or the BSD
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* 2-Clause License. This program is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License version 2 for more details at
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program available in the file COPYING in the main
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* directory of this source tree.
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*
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* The BSD 2-Clause License
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* 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
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/bitmap.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include "pvrdma.h"
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int pvrdma_uar_table_init(struct pvrdma_dev *dev)
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{
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u32 num = dev->dsr->caps.max_uar;
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u32 mask = num - 1;
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struct pvrdma_id_table *tbl = &dev->uar_table.tbl;
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if (!is_power_of_2(num))
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return -EINVAL;
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tbl->last = 0;
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tbl->top = 0;
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tbl->max = num;
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tbl->mask = mask;
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spin_lock_init(&tbl->lock);
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tbl->table = bitmap_zalloc(num, GFP_KERNEL);
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if (!tbl->table)
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return -ENOMEM;
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/* 0th UAR is taken by the device. */
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__set_bit(0, tbl->table);
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return 0;
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}
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void pvrdma_uar_table_cleanup(struct pvrdma_dev *dev)
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{
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struct pvrdma_id_table *tbl = &dev->uar_table.tbl;
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bitmap_free(tbl->table);
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}
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int pvrdma_uar_alloc(struct pvrdma_dev *dev, struct pvrdma_uar_map *uar)
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{
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struct pvrdma_id_table *tbl;
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unsigned long flags;
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u32 obj;
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tbl = &dev->uar_table.tbl;
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spin_lock_irqsave(&tbl->lock, flags);
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obj = find_next_zero_bit(tbl->table, tbl->max, tbl->last);
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if (obj >= tbl->max) {
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tbl->top = (tbl->top + tbl->max) & tbl->mask;
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obj = find_first_zero_bit(tbl->table, tbl->max);
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}
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if (obj >= tbl->max) {
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spin_unlock_irqrestore(&tbl->lock, flags);
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return -ENOMEM;
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}
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__set_bit(obj, tbl->table);
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obj |= tbl->top;
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spin_unlock_irqrestore(&tbl->lock, flags);
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uar->index = obj;
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uar->pfn = (pci_resource_start(dev->pdev, PVRDMA_PCI_RESOURCE_UAR) >>
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PAGE_SHIFT) + uar->index;
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return 0;
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}
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void pvrdma_uar_free(struct pvrdma_dev *dev, struct pvrdma_uar_map *uar)
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{
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struct pvrdma_id_table *tbl = &dev->uar_table.tbl;
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unsigned long flags;
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u32 obj;
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obj = uar->index & (tbl->max - 1);
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spin_lock_irqsave(&tbl->lock, flags);
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__clear_bit(obj, tbl->table);
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tbl->last = min(tbl->last, obj);
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tbl->top = (tbl->top + tbl->max) & tbl->mask;
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spin_unlock_irqrestore(&tbl->lock, flags);
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}
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