104 строки
3.2 KiB
C
104 строки
3.2 KiB
C
/*
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* Driver frontend for IBM Power 842 compression accelerator
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*
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* Copyright (C) 2015 Dan Streetman, IBM Corp
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*
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* Designer of the Power data compression engine:
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* Bulent Abali <abali@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include "nx-842.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
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MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
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/**
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* nx842_constraints
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*
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* This provides the driver's constraints. Different nx842 implementations
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* may have varying requirements. The constraints are:
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* @alignment: All buffers should be aligned to this
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* @multiple: All buffer lengths should be a multiple of this
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* @minimum: Buffer lengths must not be less than this amount
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* @maximum: Buffer lengths must not be more than this amount
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*
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* The constraints apply to all buffers and lengths, both input and output,
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* for both compression and decompression, except for the minimum which
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* only applies to compression input and decompression output; the
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* compressed data can be less than the minimum constraint. It can be
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* assumed that compressed data will always adhere to the multiple
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* constraint.
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*
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* The driver may succeed even if these constraints are violated;
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* however the driver can return failure or suffer reduced performance
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* if any constraint is not met.
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*/
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int nx842_constraints(struct nx842_constraints *c)
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{
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memcpy(c, nx842_platform_driver()->constraints, sizeof(*c));
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return 0;
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}
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EXPORT_SYMBOL_GPL(nx842_constraints);
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/**
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* nx842_workmem_size
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*
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* Get the amount of working memory the driver requires.
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*/
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size_t nx842_workmem_size(void)
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{
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return nx842_platform_driver()->workmem_size;
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}
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EXPORT_SYMBOL_GPL(nx842_workmem_size);
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int nx842_compress(const unsigned char *in, unsigned int ilen,
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unsigned char *out, unsigned int *olen, void *wmem)
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{
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return nx842_platform_driver()->compress(in, ilen, out, olen, wmem);
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}
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EXPORT_SYMBOL_GPL(nx842_compress);
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int nx842_decompress(const unsigned char *in, unsigned int ilen,
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unsigned char *out, unsigned int *olen, void *wmem)
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{
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return nx842_platform_driver()->decompress(in, ilen, out, olen, wmem);
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}
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EXPORT_SYMBOL_GPL(nx842_decompress);
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static __init int nx842_init(void)
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{
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request_module("nx-compress-powernv");
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request_module("nx-compress-pseries");
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/* we prevent loading if there's no platform driver, and we get the
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* module that set it so it won't unload, so we don't need to check
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* if it's set in any of the above functions
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*/
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if (!nx842_platform_driver_get()) {
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pr_err("no nx842 driver found.\n");
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return -ENODEV;
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}
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return 0;
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}
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module_init(nx842_init);
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static void __exit nx842_exit(void)
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{
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nx842_platform_driver_put();
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}
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module_exit(nx842_exit);
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