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- /*
- * Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of EITHER the GNU General Public License
- * version 2 as published by the Free Software Foundation or the BSD
- * 2-Clause License. This program is distributed in the hope that it
- * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
- * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License version 2 for more details at
- * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program available in the file COPYING in the main
- * directory of this source tree.
- *
- * The BSD 2-Clause 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 HOLDER 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 <linux/bitmap.h>
- #include <linux/errno.h>
- #include <linux/slab.h>
- #include "pvrdma.h"
- int pvrdma_uar_table_init(struct pvrdma_dev *dev)
- {
- u32 num = dev->dsr->caps.max_uar;
- u32 mask = num - 1;
- struct pvrdma_id_table *tbl = &dev->uar_table.tbl;
- if (!is_power_of_2(num))
- return -EINVAL;
- tbl->last = 0;
- tbl->top = 0;
- tbl->max = num;
- tbl->mask = mask;
- spin_lock_init(&tbl->lock);
- tbl->table = kcalloc(BITS_TO_LONGS(num), sizeof(long), GFP_KERNEL);
- if (!tbl->table)
- return -ENOMEM;
- /* 0th UAR is taken by the device. */
- set_bit(0, tbl->table);
- return 0;
- }
- void pvrdma_uar_table_cleanup(struct pvrdma_dev *dev)
- {
- struct pvrdma_id_table *tbl = &dev->uar_table.tbl;
- kfree(tbl->table);
- }
- int pvrdma_uar_alloc(struct pvrdma_dev *dev, struct pvrdma_uar_map *uar)
- {
- struct pvrdma_id_table *tbl;
- unsigned long flags;
- u32 obj;
- tbl = &dev->uar_table.tbl;
- spin_lock_irqsave(&tbl->lock, flags);
- obj = find_next_zero_bit(tbl->table, tbl->max, tbl->last);
- if (obj >= tbl->max) {
- tbl->top = (tbl->top + tbl->max) & tbl->mask;
- obj = find_first_zero_bit(tbl->table, tbl->max);
- }
- if (obj >= tbl->max) {
- spin_unlock_irqrestore(&tbl->lock, flags);
- return -ENOMEM;
- }
- set_bit(obj, tbl->table);
- obj |= tbl->top;
- spin_unlock_irqrestore(&tbl->lock, flags);
- uar->index = obj;
- uar->pfn = (pci_resource_start(dev->pdev, PVRDMA_PCI_RESOURCE_UAR) >>
- PAGE_SHIFT) + uar->index;
- return 0;
- }
- void pvrdma_uar_free(struct pvrdma_dev *dev, struct pvrdma_uar_map *uar)
- {
- struct pvrdma_id_table *tbl = &dev->uar_table.tbl;
- unsigned long flags;
- u32 obj;
- obj = uar->index & (tbl->max - 1);
- spin_lock_irqsave(&tbl->lock, flags);
- clear_bit(obj, tbl->table);
- tbl->last = min(tbl->last, obj);
- tbl->top = (tbl->top + tbl->max) & tbl->mask;
- spin_unlock_irqrestore(&tbl->lock, flags);
- }
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