sys/dev/drm/include/linux/kernel.h

   1 /*
   2  * Copyright (c) 2010 Isilon Systems, Inc.
   3  * Copyright (c) 2010 iX Systems, Inc.
   4  * Copyright (c) 2010 Panasas, Inc.
   5  * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
   6  * Copyright (c) 2014-2018 François Tigeot <ftigeot@wolfpond.org>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice unmodified, this list of conditions, and the following
  14  *    disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30 #ifndef _LINUX_KERNEL_H_
  31 #define _LINUX_KERNEL_H_
  32
  33 #include <stdarg.h>
  34 #include <linux/types.h>
  35 #include <linux/compiler.h>
  36 #include <linux/bitops.h>
  37 #include <linux/log2.h>
  38 #include <linux/printk.h>
  39
  40 #include <sys/systm.h>
  41 #include <sys/param.h>
  42 #include <sys/libkern.h>
  43 #include <sys/stat.h>
  44 #include <sys/endian.h>
  45
  46 #define U64_MAX         ((u64)~0ULL)
  47
  48 #undef  ALIGN
  49 #define ALIGN(x, y)             roundup2((x), (y))
  50 #define IS_ALIGNED(x, y)        (((x) & ((y) - 1)) == 0)
  51 #define DIV_ROUND_UP            howmany
  52 #define DIV_ROUND_UP_ULL(X, N)  DIV_ROUND_UP((unsigned long long)(X), (N))
  53
  54 #define udelay(t)               DELAY(t)
  55
  56 #define container_of(ptr, type, member)                         \
  57 ({                                                              \
  58         __typeof(((type *)0)->member) *_p = (ptr);              \
  59         (type *)((char *)_p - offsetof(type, member));          \
  60 })
  61
  62 #define ARRAY_SIZE(x)   (sizeof(x) / sizeof((x)[0]))
  63
  64 #define simple_strtoul  strtoul
  65 #define simple_strtol   strtol
  66
  67 #define min(x, y)                       ((x) < (y) ? (x) : (y))
  68 #define max(x, y)                       ((x) > (y) ? (x) : (y))
  69
  70 #define min3(a, b, c)                   min(a, min(b,c))
  71 #define max3(a, b, c)                   max(a, max(b,c))
  72
  73 #define min_t(type, _x, _y)             ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y))
  74 #define max_t(type, _x, _y)             ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y))
  75
  76 #define clamp_t(type, _x, min, max)     min_t(type, max_t(type, _x, min), max)
  77 #define clamp(x, lo, hi)                min( max(x,lo), hi)
  78 #define clamp_val(val, lo, hi)          clamp_t(typeof(val), val, lo, hi)
  79
  80 /*
  81  * This looks more complex than it should be. But we need to
  82  * get the type for the ~ right in round_down (it needs to be
  83  * as wide as the result!), and we want to evaluate the macro
  84  * arguments just once each.
  85  */
  86 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
  87 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
  88 #define round_down(x, y) ((x) & ~__round_mask(x, y))
  89
  90 #define num_possible_cpus()     mp_ncpus
  91
  92 typedef struct pm_message {
  93         int event;
  94 } pm_message_t;
  95
  96 /* Swap values of a and b */
  97 #define swap(a, b)                      \
  98 ({                                      \
  99         typeof(a) _swap_tmp = a;        \
 100         a = b;                          \
 101         b = _swap_tmp;                  \
 102 })
 103
 104 #define DIV_ROUND_CLOSEST(x, divisor)   (((x) + ((divisor) /2)) / (divisor))
 105
 106 static inline uintmax_t
 107 mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
 108 {
 109         uintmax_t q = (x / divisor);
 110         uintmax_t r = (x % divisor);
 111
 112         return ((q * multiplier) + ((r * multiplier) / divisor));
 113 }
 114
 115 static inline int64_t abs64(int64_t x)
 116 {
 117         return (x < 0 ? -x : x);
 118 }
 119
 120 #define DIV_ROUND_CLOSEST_ULL(ll, d)    \
 121  ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; })
 122
 123 #define upper_32_bits(n)        ((u32)(((n) >> 16) >> 16))
 124 #define lower_32_bits(n)        ((u32)(n))
 125
 126 /* Byteorder compat layer */
 127 #if _BYTE_ORDER == _BIG_ENDIAN
 128 #define __BIG_ENDIAN 4321
 129 #else
 130 #define __LITTLE_ENDIAN 1234
 131 #endif
 132
 133 #define cpu_to_le16(x)  htole16(x)
 134 #define le16_to_cpu(x)  le16toh(x)
 135 #define cpu_to_le32(x)  htole32(x)
 136 #define le32_to_cpu(x)  le32toh(x)
 137 #define le32_to_cpup(x) le32toh(*x)
 138
 139 #define cpu_to_be16(x)  htobe16(x)
 140 #define be16_to_cpu(x)  be16toh(x)
 141 #define cpu_to_be32(x)  htobe32(x)
 142 #define be32_to_cpu(x)  be32toh(x)
 143 #define be32_to_cpup(x) be32toh(*x)
 144
 145 static inline int __must_check
 146 kstrtouint(const char *s, unsigned int base, unsigned int *res)
 147 {
 148         *(res) = strtol(s,0,base);
 149
 150         return 0;
 151 }
 152
 153 #define kvasprintf drm_vasprintf
 154 #define kasprintf drm_asprintf
 155
 156 static inline void __user *
 157 u64_to_user_ptr(u64 address)
 158 {
 159         return (void __user *)(uintptr_t)address;
 160 }
 161
 162 static inline void
 163 might_sleep(void)
 164 {
 165 }
 166
 167 #define snprintf        ksnprintf
 168
 169 #define scnprintf       kscnprintf
 170
 171 static inline int
 172 vsnprintf(char *buf, size_t size, const char *fmt, __va_list args)
 173 {
 174         return kvsnprintf(buf, size, fmt, args);
 175 }
 176
 177 static inline int
 178 vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 179 {
 180         int ret;
 181
 182         if (size == 0)
 183                 return 0;
 184
 185         ret = vsnprintf(buf, size, fmt, args);
 186         if (ret < size)
 187                 return ret;
 188
 189         return size - 1;
 190 }
 191
 192 #endif  /* _LINUX_KERNEL_H_ */