1 #!/bin/bash 1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0-only 2 # SPDX-License-Identifier: GPL-2.0-only
3 # Translate the bits making up a GFP mask 3 # Translate the bits making up a GFP mask
4 # (c) 2009, Mel Gorman <mel@csn.ul.ie> 4 # (c) 2009, Mel Gorman <mel@csn.ul.ie>
5 SOURCE= 5 SOURCE=
6 GFPMASK=none 6 GFPMASK=none
7 7
8 # Helper function to report failures and exit 8 # Helper function to report failures and exit
9 die() { 9 die() {
10 echo ERROR: $@ 10 echo ERROR: $@
11 if [ "$TMPFILE" != "" ]; then 11 if [ "$TMPFILE" != "" ]; then
12 rm -f $TMPFILE 12 rm -f $TMPFILE
13 fi 13 fi
14 exit -1 14 exit -1
15 } 15 }
16 16
17 usage() { 17 usage() {
18 echo "usage: gfp-translate [-h] [ --so 18 echo "usage: gfp-translate [-h] [ --source DIRECTORY ] gfpmask"
19 exit 0 19 exit 0
20 } 20 }
21 21
22 # Parse command-line arguments 22 # Parse command-line arguments
23 while [ $# -gt 0 ]; do 23 while [ $# -gt 0 ]; do
24 case $1 in 24 case $1 in
25 --source) 25 --source)
26 SOURCE=$2 26 SOURCE=$2
27 shift 2 27 shift 2
28 ;; 28 ;;
29 -h) 29 -h)
30 usage 30 usage
31 ;; 31 ;;
32 --help) 32 --help)
33 usage 33 usage
34 ;; 34 ;;
35 *) 35 *)
36 GFPMASK=$1 36 GFPMASK=$1
37 shift 37 shift
38 ;; 38 ;;
39 esac 39 esac
40 done 40 done
41 41
42 # Guess the kernel source directory if it's no 42 # Guess the kernel source directory if it's not set. Preference is in order of
43 # o current directory 43 # o current directory
44 # o /usr/src/linux 44 # o /usr/src/linux
45 if [ "$SOURCE" = "" ]; then 45 if [ "$SOURCE" = "" ]; then
46 if [ -r "/usr/src/linux/Makefile" ]; t 46 if [ -r "/usr/src/linux/Makefile" ]; then
47 SOURCE=/usr/src/linux 47 SOURCE=/usr/src/linux
48 fi 48 fi
49 if [ -r "`pwd`/Makefile" ]; then 49 if [ -r "`pwd`/Makefile" ]; then
50 SOURCE=`pwd` 50 SOURCE=`pwd`
51 fi 51 fi
52 fi 52 fi
53 53
54 # Confirm that a source directory exists 54 # Confirm that a source directory exists
55 if [ ! -r "$SOURCE/Makefile" ]; then 55 if [ ! -r "$SOURCE/Makefile" ]; then
56 die "Could not locate kernel source di 56 die "Could not locate kernel source directory or it is invalid"
57 fi 57 fi
58 58
59 # Confirm that a GFP mask has been specified 59 # Confirm that a GFP mask has been specified
60 if [ "$GFPMASK" = "none" ]; then 60 if [ "$GFPMASK" = "none" ]; then
61 usage 61 usage
62 fi 62 fi
63 63
64 # Extract GFP flags from the kernel source 64 # Extract GFP flags from the kernel source
65 TMPFILE=`mktemp -t gfptranslate-XXXXXX.c` || e !! 65 TMPFILE=`mktemp -t gfptranslate-XXXXXX` || exit 1
66 !! 66 grep -q ___GFP $SOURCE/include/linux/gfp.h
>> 67 if [ $? -eq 0 ]; then
>> 68 grep "^#define ___GFP" $SOURCE/include/linux/gfp.h | sed -e 's/u$//' | grep -v GFP_BITS > $TMPFILE
>> 69 else
>> 70 grep "^#define __GFP" $SOURCE/include/linux/gfp.h | sed -e 's/(__force gfp_t)//' | sed -e 's/u)/)/' | grep -v GFP_BITS | sed -e 's/)\//) \//' > $TMPFILE
>> 71 fi
>> 72
>> 73 # Parse the flags
>> 74 IFS="
>> 75 "
67 echo Source: $SOURCE 76 echo Source: $SOURCE
68 echo Parsing: $GFPMASK 77 echo Parsing: $GFPMASK
>> 78 for LINE in `cat $TMPFILE`; do
>> 79 MASK=`echo $LINE | awk '{print $3}'`
>> 80 if [ $(($GFPMASK&$MASK)) -ne 0 ]; then
>> 81 echo $LINE
>> 82 fi
>> 83 done
69 84
70 ( !! 85 rm -f $TMPFILE
71 cat <<EOF <<
72 #include <stdint.h> <<
73 #include <stdio.h> <<
74 <<
75 // Try to fool compiler.h into not including e <<
76 #define __ASSEMBLY__ 1 <<
77 <<
78 #include <generated/autoconf.h> <<
79 #include <linux/gfp_types.h> <<
80 <<
81 static const char *masks[] = { <<
82 EOF <<
83 <<
84 sed -nEe 's/^[[:space:]]+(___GFP_.*)_BIT,. <<
85 while read b; do <<
86 cat <<EOF <<
87 #if defined($b) && ($b > 0) <<
88 [${b}_BIT] = "$b", <<
89 #endif <<
90 EOF <<
91 done <<
92 <<
93 cat <<EOF <<
94 }; <<
95 <<
96 int main(int argc, char *argv[]) <<
97 { <<
98 unsigned long long mask = $GFPMASK; <<
99 <<
100 for (int i = 0; i < sizeof(mask) * 8; <<
101 unsigned long long bit = 1ULL <<
102 if (mask & bit) <<
103 printf("\t%-25s0x%llx\ <<
104 (i < ___GFP_LAS <<
105 masks[ <<
106 bit); <<
107 } <<
108 <<
109 return 0; <<
110 } <<
111 EOF <<
112 ) > $TMPFILE <<
113 <<
114 ${CC:-gcc} -Wall -o ${TMPFILE}.bin -I $SOURCE/ <<
115 <<
116 rm -f $TMPFILE ${TMPFILE}.bin <<
117 <<
118 exit 0 86 exit 0
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