2018-04-22 09:23:50 -07:00
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// SPDX-License-Identifier: GPL-2.0
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2005-11-07 04:15:37 -07:00
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/*
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2018-04-22 09:23:49 -07:00
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* Generic Reed Solomon encoder / decoder library
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2005-11-07 04:15:37 -07:00
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*
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2005-04-16 15:20:36 -07:00
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* Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de)
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*
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* Reed Solomon code lifted from reed solomon library written by Phil Karn
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* Copyright 2002 Phil Karn, KA9Q
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*
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* Description:
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2005-11-07 04:15:37 -07:00
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*
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2005-04-16 15:20:36 -07:00
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* The generic Reed Solomon library provides runtime configurable
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* encoding / decoding of RS codes.
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2018-04-22 09:23:53 -07:00
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*
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* Each user must call init_rs to get a pointer to a rs_control structure
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* for the given rs parameters. The control struct is unique per instance.
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* It points to a codec which can be shared by multiple control structures.
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* If a codec is newly allocated then the polynomial arrays for fast
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* encoding / decoding are built. This can take some time so make sure not
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* to call this function from a time critical path. Usually a module /
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* driver should initialize the necessary rs_control structure on module /
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* driver init and release it on exit.
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*
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* The encoding puts the calculated syndrome into a given syndrome buffer.
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*
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* The decoding is a two step process. The first step calculates the
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* syndrome over the received (data + syndrome) and calls the second stage,
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* which does the decoding / error correction itself. Many hw encoders
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* provide a syndrome calculation over the received data + syndrome and can
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* call the second stage directly.
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2005-04-16 15:20:36 -07:00
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/rslib.h>
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#include <linux/slab.h>
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2006-03-23 04:00:24 -07:00
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#include <linux/mutex.h>
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2005-04-16 15:20:36 -07:00
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2018-04-22 09:23:55 -07:00
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enum {
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RS_DECODE_LAMBDA,
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RS_DECODE_SYN,
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RS_DECODE_B,
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RS_DECODE_T,
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RS_DECODE_OMEGA,
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RS_DECODE_ROOT,
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RS_DECODE_REG,
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RS_DECODE_LOC,
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RS_DECODE_NUM_BUFFERS
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};
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2018-04-22 09:23:53 -07:00
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/* This list holds all currently allocated rs codec structures */
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static LIST_HEAD(codec_list);
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2005-04-16 15:20:36 -07:00
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/* Protection for the list */
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2006-03-23 04:00:24 -07:00
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static DEFINE_MUTEX(rslistlock);
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2005-04-16 15:20:36 -07:00
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2005-11-07 04:15:37 -07:00
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/**
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2018-04-22 09:23:53 -07:00
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* codec_init - Initialize a Reed-Solomon codec
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2005-04-16 15:20:36 -07:00
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* @symsize: symbol size, bits (1-8)
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* @gfpoly: Field generator polynomial coefficients
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2007-05-02 03:18:41 -07:00
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* @gffunc: Field generator function
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2005-04-16 15:20:36 -07:00
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* @fcr: first root of RS code generator polynomial, index form
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* @prim: primitive element to generate polynomial roots
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* @nroots: RS code generator polynomial degree (number of roots)
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2018-04-22 09:23:46 -07:00
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* @gfp: GFP_ flags for allocations
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2005-04-16 15:20:36 -07:00
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*
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2018-04-22 09:23:53 -07:00
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* Allocate a codec structure and the polynom arrays for faster
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2006-06-25 05:49:14 -07:00
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* en/decoding. Fill the arrays according to the given parameters.
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2005-04-16 15:20:36 -07:00
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*/
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2018-04-22 09:23:53 -07:00
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static struct rs_codec *codec_init(int symsize, int gfpoly, int (*gffunc)(int),
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int fcr, int prim, int nroots, gfp_t gfp)
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2005-04-16 15:20:36 -07:00
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{
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int i, j, sr, root, iprim;
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2018-04-22 09:23:53 -07:00
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struct rs_codec *rs;
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2005-04-16 15:20:36 -07:00
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2018-04-22 09:23:52 -07:00
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rs = kzalloc(sizeof(*rs), gfp);
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2018-04-22 09:23:46 -07:00
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if (!rs)
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2005-04-16 15:20:36 -07:00
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return NULL;
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INIT_LIST_HEAD(&rs->list);
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rs->mm = symsize;
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rs->nn = (1 << symsize) - 1;
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rs->fcr = fcr;
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rs->prim = prim;
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rs->nroots = nroots;
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rs->gfpoly = gfpoly;
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2007-05-02 03:18:41 -07:00
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rs->gffunc = gffunc;
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2005-04-16 15:20:36 -07:00
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/* Allocate the arrays */
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treewide: kmalloc() -> kmalloc_array()
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:
kmalloc(a * b, gfp)
with:
kmalloc_array(a * b, gfp)
as well as handling cases of:
kmalloc(a * b * c, gfp)
with:
kmalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kmalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kmalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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kmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
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kmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
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- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kmalloc
+ kmalloc_array
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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kmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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kmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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kmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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kmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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kmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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kmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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kmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kmalloc(sizeof(THING) * C2, ...)
|
kmalloc(sizeof(TYPE) * C2, ...)
|
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * E2
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 13:55:00 -07:00
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rs->alpha_to = kmalloc_array(rs->nn + 1, sizeof(uint16_t), gfp);
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2005-04-16 15:20:36 -07:00
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if (rs->alpha_to == NULL)
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2018-04-22 09:23:52 -07:00
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goto err;
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2005-04-16 15:20:36 -07:00
|
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|
|
treewide: kmalloc() -> kmalloc_array()
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:
kmalloc(a * b, gfp)
with:
kmalloc_array(a * b, gfp)
as well as handling cases of:
kmalloc(a * b * c, gfp)
with:
kmalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kmalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kmalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kmalloc
+ kmalloc_array
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kmalloc(sizeof(THING) * C2, ...)
|
kmalloc(sizeof(TYPE) * C2, ...)
|
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * E2
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 13:55:00 -07:00
|
|
|
rs->index_of = kmalloc_array(rs->nn + 1, sizeof(uint16_t), gfp);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rs->index_of == NULL)
|
2018-04-22 09:23:52 -07:00
|
|
|
goto err;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
treewide: kmalloc() -> kmalloc_array()
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:
kmalloc(a * b, gfp)
with:
kmalloc_array(a * b, gfp)
as well as handling cases of:
kmalloc(a * b * c, gfp)
with:
kmalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kmalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kmalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kmalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kmalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kmalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kmalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kmalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kmalloc
+ kmalloc_array
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kmalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kmalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kmalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kmalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kmalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kmalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kmalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kmalloc(sizeof(THING) * C2, ...)
|
kmalloc(sizeof(TYPE) * C2, ...)
|
kmalloc(C1 * C2 * C3, ...)
|
kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * E2
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kmalloc
+ kmalloc_array
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 13:55:00 -07:00
|
|
|
rs->genpoly = kmalloc_array(rs->nroots + 1, sizeof(uint16_t), gfp);
|
2005-04-16 15:20:36 -07:00
|
|
|
if(rs->genpoly == NULL)
|
2018-04-22 09:23:52 -07:00
|
|
|
goto err;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
/* Generate Galois field lookup tables */
|
|
|
|
rs->index_of[0] = rs->nn; /* log(zero) = -inf */
|
|
|
|
rs->alpha_to[rs->nn] = 0; /* alpha**-inf = 0 */
|
2007-05-02 03:18:41 -07:00
|
|
|
if (gfpoly) {
|
|
|
|
sr = 1;
|
|
|
|
for (i = 0; i < rs->nn; i++) {
|
|
|
|
rs->index_of[sr] = i;
|
|
|
|
rs->alpha_to[i] = sr;
|
|
|
|
sr <<= 1;
|
|
|
|
if (sr & (1 << symsize))
|
|
|
|
sr ^= gfpoly;
|
|
|
|
sr &= rs->nn;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
sr = gffunc(0);
|
|
|
|
for (i = 0; i < rs->nn; i++) {
|
|
|
|
rs->index_of[sr] = i;
|
|
|
|
rs->alpha_to[i] = sr;
|
|
|
|
sr = gffunc(sr);
|
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
/* If it's not primitive, exit */
|
2007-05-02 03:18:41 -07:00
|
|
|
if(sr != rs->alpha_to[0])
|
2018-04-22 09:23:52 -07:00
|
|
|
goto err;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
/* Find prim-th root of 1, used in decoding */
|
|
|
|
for(iprim = 1; (iprim % prim) != 0; iprim += rs->nn);
|
|
|
|
/* prim-th root of 1, index form */
|
|
|
|
rs->iprim = iprim / prim;
|
|
|
|
|
|
|
|
/* Form RS code generator polynomial from its roots */
|
|
|
|
rs->genpoly[0] = 1;
|
|
|
|
for (i = 0, root = fcr * prim; i < nroots; i++, root += prim) {
|
|
|
|
rs->genpoly[i + 1] = 1;
|
|
|
|
/* Multiply rs->genpoly[] by @**(root + x) */
|
|
|
|
for (j = i; j > 0; j--) {
|
|
|
|
if (rs->genpoly[j] != 0) {
|
2005-11-07 04:15:37 -07:00
|
|
|
rs->genpoly[j] = rs->genpoly[j -1] ^
|
|
|
|
rs->alpha_to[rs_modnn(rs,
|
2005-04-16 15:20:36 -07:00
|
|
|
rs->index_of[rs->genpoly[j]] + root)];
|
|
|
|
} else
|
|
|
|
rs->genpoly[j] = rs->genpoly[j - 1];
|
|
|
|
}
|
|
|
|
/* rs->genpoly[0] can never be zero */
|
2005-11-07 04:15:37 -07:00
|
|
|
rs->genpoly[0] =
|
|
|
|
rs->alpha_to[rs_modnn(rs,
|
2005-04-16 15:20:36 -07:00
|
|
|
rs->index_of[rs->genpoly[0]] + root)];
|
|
|
|
}
|
|
|
|
/* convert rs->genpoly[] to index form for quicker encoding */
|
|
|
|
for (i = 0; i <= nroots; i++)
|
|
|
|
rs->genpoly[i] = rs->index_of[rs->genpoly[i]];
|
2018-04-22 09:23:53 -07:00
|
|
|
|
|
|
|
rs->users = 1;
|
|
|
|
list_add(&rs->list, &codec_list);
|
2005-04-16 15:20:36 -07:00
|
|
|
return rs;
|
|
|
|
|
2018-04-22 09:23:52 -07:00
|
|
|
err:
|
2005-04-16 15:20:36 -07:00
|
|
|
kfree(rs->genpoly);
|
|
|
|
kfree(rs->index_of);
|
|
|
|
kfree(rs->alpha_to);
|
|
|
|
kfree(rs);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2005-11-07 04:15:37 -07:00
|
|
|
/**
|
2018-04-22 09:23:53 -07:00
|
|
|
* free_rs - Free the rs control structure
|
|
|
|
* @rs: The control structure which is not longer used by the
|
2005-04-16 15:20:36 -07:00
|
|
|
* caller
|
2018-04-22 09:23:53 -07:00
|
|
|
*
|
|
|
|
* Free the control structure. If @rs is the last user of the associated
|
|
|
|
* codec, free the codec as well.
|
2005-04-16 15:20:36 -07:00
|
|
|
*/
|
|
|
|
void free_rs(struct rs_control *rs)
|
|
|
|
{
|
2018-04-22 09:23:53 -07:00
|
|
|
struct rs_codec *cd;
|
|
|
|
|
|
|
|
if (!rs)
|
|
|
|
return;
|
|
|
|
|
|
|
|
cd = rs->codec;
|
2006-03-23 04:00:24 -07:00
|
|
|
mutex_lock(&rslistlock);
|
2018-04-22 09:23:53 -07:00
|
|
|
cd->users--;
|
|
|
|
if(!cd->users) {
|
|
|
|
list_del(&cd->list);
|
|
|
|
kfree(cd->alpha_to);
|
|
|
|
kfree(cd->index_of);
|
|
|
|
kfree(cd->genpoly);
|
|
|
|
kfree(cd);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2006-03-23 04:00:24 -07:00
|
|
|
mutex_unlock(&rslistlock);
|
2018-04-22 09:23:53 -07:00
|
|
|
kfree(rs);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2018-04-22 09:23:46 -07:00
|
|
|
EXPORT_SYMBOL_GPL(free_rs);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2005-11-07 04:15:37 -07:00
|
|
|
/**
|
2018-04-22 09:23:53 -07:00
|
|
|
* init_rs_internal - Allocate rs control, find a matching codec or allocate a new one
|
2005-04-16 15:20:36 -07:00
|
|
|
* @symsize: the symbol size (number of bits)
|
|
|
|
* @gfpoly: the extended Galois field generator polynomial coefficients,
|
|
|
|
* with the 0th coefficient in the low order bit. The polynomial
|
|
|
|
* must be primitive;
|
2007-05-02 03:18:41 -07:00
|
|
|
* @gffunc: pointer to function to generate the next field element,
|
|
|
|
* or the multiplicative identity element if given 0. Used
|
|
|
|
* instead of gfpoly if gfpoly is 0
|
2018-04-22 09:23:48 -07:00
|
|
|
* @fcr: the first consecutive root of the rs code generator polynomial
|
2005-04-16 15:20:36 -07:00
|
|
|
* in index form
|
|
|
|
* @prim: primitive element to generate polynomial roots
|
|
|
|
* @nroots: RS code generator polynomial degree (number of roots)
|
2018-04-22 09:23:46 -07:00
|
|
|
* @gfp: GFP_ flags for allocations
|
2005-04-16 15:20:36 -07:00
|
|
|
*/
|
2007-05-02 03:18:41 -07:00
|
|
|
static struct rs_control *init_rs_internal(int symsize, int gfpoly,
|
2018-04-22 09:23:46 -07:00
|
|
|
int (*gffunc)(int), int fcr,
|
|
|
|
int prim, int nroots, gfp_t gfp)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2018-04-22 09:23:46 -07:00
|
|
|
struct list_head *tmp;
|
|
|
|
struct rs_control *rs;
|
2018-04-22 09:23:55 -07:00
|
|
|
unsigned int bsize;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
/* Sanity checks */
|
|
|
|
if (symsize < 1)
|
|
|
|
return NULL;
|
|
|
|
if (fcr < 0 || fcr >= (1<<symsize))
|
2018-04-22 09:23:48 -07:00
|
|
|
return NULL;
|
2005-04-16 15:20:36 -07:00
|
|
|
if (prim <= 0 || prim >= (1<<symsize))
|
2018-04-22 09:23:48 -07:00
|
|
|
return NULL;
|
2005-11-07 04:15:37 -07:00
|
|
|
if (nroots < 0 || nroots >= (1<<symsize))
|
2005-04-16 15:20:36 -07:00
|
|
|
return NULL;
|
2005-11-07 04:15:37 -07:00
|
|
|
|
2018-04-22 09:23:55 -07:00
|
|
|
/*
|
|
|
|
* The decoder needs buffers in each control struct instance to
|
|
|
|
* avoid variable size or large fixed size allocations on
|
|
|
|
* stack. Size the buffers to arrays of [nroots + 1].
|
|
|
|
*/
|
|
|
|
bsize = sizeof(uint16_t) * RS_DECODE_NUM_BUFFERS * (nroots + 1);
|
|
|
|
rs = kzalloc(sizeof(*rs) + bsize, gfp);
|
2018-04-22 09:23:53 -07:00
|
|
|
if (!rs)
|
|
|
|
return NULL;
|
|
|
|
|
2006-03-23 04:00:24 -07:00
|
|
|
mutex_lock(&rslistlock);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
/* Walk through the list and look for a matching entry */
|
2018-04-22 09:23:53 -07:00
|
|
|
list_for_each(tmp, &codec_list) {
|
|
|
|
struct rs_codec *cd = list_entry(tmp, struct rs_codec, list);
|
|
|
|
|
|
|
|
if (symsize != cd->mm)
|
2005-04-16 15:20:36 -07:00
|
|
|
continue;
|
2018-04-22 09:23:53 -07:00
|
|
|
if (gfpoly != cd->gfpoly)
|
2005-04-16 15:20:36 -07:00
|
|
|
continue;
|
2018-04-22 09:23:53 -07:00
|
|
|
if (gffunc != cd->gffunc)
|
2007-05-02 03:18:41 -07:00
|
|
|
continue;
|
2018-04-22 09:23:53 -07:00
|
|
|
if (fcr != cd->fcr)
|
2005-11-07 04:15:37 -07:00
|
|
|
continue;
|
2018-04-22 09:23:53 -07:00
|
|
|
if (prim != cd->prim)
|
2005-11-07 04:15:37 -07:00
|
|
|
continue;
|
2018-04-22 09:23:53 -07:00
|
|
|
if (nroots != cd->nroots)
|
2005-04-16 15:20:36 -07:00
|
|
|
continue;
|
|
|
|
/* We have a matching one already */
|
2018-04-22 09:23:53 -07:00
|
|
|
cd->users++;
|
|
|
|
rs->codec = cd;
|
2005-04-16 15:20:36 -07:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Create a new one */
|
2018-04-22 09:23:53 -07:00
|
|
|
rs->codec = codec_init(symsize, gfpoly, gffunc, fcr, prim, nroots, gfp);
|
|
|
|
if (!rs->codec) {
|
|
|
|
kfree(rs);
|
|
|
|
rs = NULL;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2005-11-07 04:15:37 -07:00
|
|
|
out:
|
2006-03-23 04:00:24 -07:00
|
|
|
mutex_unlock(&rslistlock);
|
2005-04-16 15:20:36 -07:00
|
|
|
return rs;
|
|
|
|
}
|
|
|
|
|
2007-05-02 03:18:41 -07:00
|
|
|
/**
|
2018-04-22 09:23:53 -07:00
|
|
|
* init_rs_gfp - Create a RS control struct and initialize it
|
2007-05-02 03:18:41 -07:00
|
|
|
* @symsize: the symbol size (number of bits)
|
|
|
|
* @gfpoly: the extended Galois field generator polynomial coefficients,
|
|
|
|
* with the 0th coefficient in the low order bit. The polynomial
|
|
|
|
* must be primitive;
|
2018-04-22 09:23:48 -07:00
|
|
|
* @fcr: the first consecutive root of the rs code generator polynomial
|
2007-05-02 03:18:41 -07:00
|
|
|
* in index form
|
|
|
|
* @prim: primitive element to generate polynomial roots
|
|
|
|
* @nroots: RS code generator polynomial degree (number of roots)
|
2018-07-03 12:43:54 -07:00
|
|
|
* @gfp: Memory allocation flags.
|
2007-05-02 03:18:41 -07:00
|
|
|
*/
|
2018-04-22 09:23:46 -07:00
|
|
|
struct rs_control *init_rs_gfp(int symsize, int gfpoly, int fcr, int prim,
|
|
|
|
int nroots, gfp_t gfp)
|
2007-05-02 03:18:41 -07:00
|
|
|
{
|
2018-04-22 09:23:46 -07:00
|
|
|
return init_rs_internal(symsize, gfpoly, NULL, fcr, prim, nroots, gfp);
|
2007-05-02 03:18:41 -07:00
|
|
|
}
|
2018-04-22 09:23:46 -07:00
|
|
|
EXPORT_SYMBOL_GPL(init_rs_gfp);
|
2007-05-02 03:18:41 -07:00
|
|
|
|
|
|
|
/**
|
2018-04-22 09:23:53 -07:00
|
|
|
* init_rs_non_canonical - Allocate rs control struct for fields with
|
|
|
|
* non-canonical representation
|
2007-05-02 03:18:41 -07:00
|
|
|
* @symsize: the symbol size (number of bits)
|
|
|
|
* @gffunc: pointer to function to generate the next field element,
|
|
|
|
* or the multiplicative identity element if given 0. Used
|
|
|
|
* instead of gfpoly if gfpoly is 0
|
2018-04-22 09:23:48 -07:00
|
|
|
* @fcr: the first consecutive root of the rs code generator polynomial
|
2007-05-02 03:18:41 -07:00
|
|
|
* in index form
|
|
|
|
* @prim: primitive element to generate polynomial roots
|
|
|
|
* @nroots: RS code generator polynomial degree (number of roots)
|
|
|
|
*/
|
|
|
|
struct rs_control *init_rs_non_canonical(int symsize, int (*gffunc)(int),
|
2018-04-22 09:23:48 -07:00
|
|
|
int fcr, int prim, int nroots)
|
2007-05-02 03:18:41 -07:00
|
|
|
{
|
2018-04-22 09:23:46 -07:00
|
|
|
return init_rs_internal(symsize, 0, gffunc, fcr, prim, nroots,
|
|
|
|
GFP_KERNEL);
|
2007-05-02 03:18:41 -07:00
|
|
|
}
|
2018-04-22 09:23:46 -07:00
|
|
|
EXPORT_SYMBOL_GPL(init_rs_non_canonical);
|
2007-05-02 03:18:41 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
#ifdef CONFIG_REED_SOLOMON_ENC8
|
2005-11-07 04:15:37 -07:00
|
|
|
/**
|
2005-04-16 15:20:36 -07:00
|
|
|
* encode_rs8 - Calculate the parity for data values (8bit data width)
|
2018-04-22 09:23:53 -07:00
|
|
|
* @rsc: the rs control structure
|
2005-04-16 15:20:36 -07:00
|
|
|
* @data: data field of a given type
|
2005-11-07 04:15:37 -07:00
|
|
|
* @len: data length
|
2005-04-16 15:20:36 -07:00
|
|
|
* @par: parity data, must be initialized by caller (usually all 0)
|
|
|
|
* @invmsk: invert data mask (will be xored on data)
|
|
|
|
*
|
|
|
|
* The parity uses a uint16_t data type to enable
|
|
|
|
* symbol size > 8. The calling code must take care of encoding of the
|
|
|
|
* syndrome result for storage itself.
|
|
|
|
*/
|
2018-04-22 09:23:53 -07:00
|
|
|
int encode_rs8(struct rs_control *rsc, uint8_t *data, int len, uint16_t *par,
|
2005-04-16 15:20:36 -07:00
|
|
|
uint16_t invmsk)
|
|
|
|
{
|
|
|
|
#include "encode_rs.c"
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(encode_rs8);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_REED_SOLOMON_DEC8
|
2005-11-07 04:15:37 -07:00
|
|
|
/**
|
2005-04-16 15:20:36 -07:00
|
|
|
* decode_rs8 - Decode codeword (8bit data width)
|
2018-04-22 09:23:53 -07:00
|
|
|
* @rsc: the rs control structure
|
2005-04-16 15:20:36 -07:00
|
|
|
* @data: data field of a given type
|
|
|
|
* @par: received parity data field
|
|
|
|
* @len: data length
|
2019-06-20 07:10:38 -07:00
|
|
|
* @s: syndrome data field, must be in index form
|
|
|
|
* (if NULL, syndrome is calculated)
|
2005-04-16 15:20:36 -07:00
|
|
|
* @no_eras: number of erasures
|
|
|
|
* @eras_pos: position of erasures, can be NULL
|
|
|
|
* @invmsk: invert data mask (will be xored on data, not on parity!)
|
|
|
|
* @corr: buffer to store correction bitmask on eras_pos
|
|
|
|
*
|
|
|
|
* The syndrome and parity uses a uint16_t data type to enable
|
|
|
|
* symbol size > 8. The calling code must take care of decoding of the
|
|
|
|
* syndrome result and the received parity before calling this code.
|
2018-04-22 09:23:55 -07:00
|
|
|
*
|
|
|
|
* Note: The rs_control struct @rsc contains buffers which are used for
|
|
|
|
* decoding, so the caller has to ensure that decoder invocations are
|
|
|
|
* serialized.
|
|
|
|
*
|
2019-06-20 07:10:38 -07:00
|
|
|
* Returns the number of corrected symbols or -EBADMSG for uncorrectable
|
|
|
|
* errors. The count includes errors in the parity.
|
2005-04-16 15:20:36 -07:00
|
|
|
*/
|
2018-04-22 09:23:53 -07:00
|
|
|
int decode_rs8(struct rs_control *rsc, uint8_t *data, uint16_t *par, int len,
|
2005-11-07 04:15:37 -07:00
|
|
|
uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
|
2005-04-16 15:20:36 -07:00
|
|
|
uint16_t *corr)
|
|
|
|
{
|
|
|
|
#include "decode_rs.c"
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(decode_rs8);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_REED_SOLOMON_ENC16
|
|
|
|
/**
|
|
|
|
* encode_rs16 - Calculate the parity for data values (16bit data width)
|
2018-04-22 09:23:53 -07:00
|
|
|
* @rsc: the rs control structure
|
2005-04-16 15:20:36 -07:00
|
|
|
* @data: data field of a given type
|
2005-11-07 04:15:37 -07:00
|
|
|
* @len: data length
|
2005-04-16 15:20:36 -07:00
|
|
|
* @par: parity data, must be initialized by caller (usually all 0)
|
|
|
|
* @invmsk: invert data mask (will be xored on data, not on parity!)
|
|
|
|
*
|
|
|
|
* Each field in the data array contains up to symbol size bits of valid data.
|
|
|
|
*/
|
2018-04-22 09:23:53 -07:00
|
|
|
int encode_rs16(struct rs_control *rsc, uint16_t *data, int len, uint16_t *par,
|
2005-04-16 15:20:36 -07:00
|
|
|
uint16_t invmsk)
|
|
|
|
{
|
|
|
|
#include "encode_rs.c"
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(encode_rs16);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_REED_SOLOMON_DEC16
|
2005-11-07 04:15:37 -07:00
|
|
|
/**
|
2005-04-16 15:20:36 -07:00
|
|
|
* decode_rs16 - Decode codeword (16bit data width)
|
2018-04-22 09:23:53 -07:00
|
|
|
* @rsc: the rs control structure
|
2005-04-16 15:20:36 -07:00
|
|
|
* @data: data field of a given type
|
|
|
|
* @par: received parity data field
|
|
|
|
* @len: data length
|
2019-06-20 07:10:38 -07:00
|
|
|
* @s: syndrome data field, must be in index form
|
|
|
|
* (if NULL, syndrome is calculated)
|
2005-04-16 15:20:36 -07:00
|
|
|
* @no_eras: number of erasures
|
|
|
|
* @eras_pos: position of erasures, can be NULL
|
2005-11-07 04:15:37 -07:00
|
|
|
* @invmsk: invert data mask (will be xored on data, not on parity!)
|
2005-04-16 15:20:36 -07:00
|
|
|
* @corr: buffer to store correction bitmask on eras_pos
|
|
|
|
*
|
|
|
|
* Each field in the data array contains up to symbol size bits of valid data.
|
2018-04-22 09:23:55 -07:00
|
|
|
*
|
|
|
|
* Note: The rc_control struct @rsc contains buffers which are used for
|
|
|
|
* decoding, so the caller has to ensure that decoder invocations are
|
|
|
|
* serialized.
|
|
|
|
*
|
2019-06-20 07:10:38 -07:00
|
|
|
* Returns the number of corrected symbols or -EBADMSG for uncorrectable
|
|
|
|
* errors. The count includes errors in the parity.
|
2005-04-16 15:20:36 -07:00
|
|
|
*/
|
2018-04-22 09:23:53 -07:00
|
|
|
int decode_rs16(struct rs_control *rsc, uint16_t *data, uint16_t *par, int len,
|
2005-11-07 04:15:37 -07:00
|
|
|
uint16_t *s, int no_eras, int *eras_pos, uint16_t invmsk,
|
2005-04-16 15:20:36 -07:00
|
|
|
uint16_t *corr)
|
|
|
|
{
|
|
|
|
#include "decode_rs.c"
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(decode_rs16);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_DESCRIPTION("Reed Solomon encoder/decoder");
|
|
|
|
MODULE_AUTHOR("Phil Karn, Thomas Gleixner");
|
|
|
|
|