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127 lines
3.9 KiB
127 lines
3.9 KiB
/* |
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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 = kcalloc(BITS_TO_LONGS(num), sizeof(long), 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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kfree(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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