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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef included_clib_cpu_h
#define included_clib_cpu_h
#include <sys/syscall.h>
#include <vppinfra/format.h>
/*
* multiarchitecture support. Adding new entry will produce
* new graph node function variant optimized for specific cpu
* microarchitecture.
* Order is important for runtime selection, as 1st match wins...
*/
#if __x86_64__ && CLIB_DEBUG == 0
#define foreach_march_variant(macro, x) \
macro(avx2, x, "arch=core-avx2")
#else
#define foreach_march_variant(macro, x)
#endif
#if __GNUC__ > 4 && !__clang__ && CLIB_DEBUG == 0
#define CLIB_CPU_OPTIMIZED __attribute__ ((optimize ("O3")))
#else
#define CLIB_CPU_OPTIMIZED
#endif
#define CLIB_MULTIARCH_ARCH_CHECK(arch, fn, tgt) \
if (clib_cpu_supports_ ## arch()) \
return & fn ## _ ##arch;
#define CLIB_MULTIARCH_SELECT_FN(fn,...) \
__VA_ARGS__ void * fn ## _multiarch_select(void) \
{ \
foreach_march_variant(CLIB_MULTIARCH_ARCH_CHECK, fn) \
return & fn; \
}
#ifdef CLIB_MARCH_VARIANT
#define __CLIB_MULTIARCH_FN(a,b) a##_##b
#define _CLIB_MULTIARCH_FN(a,b) __CLIB_MULTIARCH_FN(a,b)
#define CLIB_MULTIARCH_FN(fn) _CLIB_MULTIARCH_FN(fn,CLIB_MARCH_VARIANT)
#else
#define CLIB_MULTIARCH_FN(fn) fn
#endif
#define CLIB_MARCH_SFX CLIB_MULTIARCH_FN
#define foreach_x86_64_flags \
_ (sse3, 1, ecx, 0) \
_ (ssse3, 1, ecx, 9) \
_ (sse41, 1, ecx, 19) \
_ (sse42, 1, ecx, 20) \
_ (avx, 1, ecx, 28) \
_ (avx2, 7, ebx, 5) \
_ (avx512f, 7, ebx, 16) \
_ (x86_aes, 1, ecx, 25) \
_ (sha, 7, ebx, 29) \
_ (invariant_tsc, 0x80000007, edx, 8)
#define foreach_aarch64_flags \
_ (fp, 0) \
_ (asimd, 1) \
_ (evtstrm, 2) \
_ (aarch64_aes, 3) \
_ (pmull, 4) \
_ (sha1, 5) \
_ (sha2, 6) \
_ (crc32, 7) \
_ (atomics, 8) \
_ (fphp, 9) \
_ (asimdhp, 10) \
_ (cpuid, 11) \
_ (asimdrdm, 12) \
_ (jscvt, 13) \
_ (fcma, 14) \
_ (lrcpc, 15) \
_ (dcpop, 16) \
_ (sha3, 17) \
_ (sm3, 18) \
_ (sm4, 19) \
_ (asimddp, 20) \
_ (sha512, 21) \
_ (sve, 22)
static inline u32
clib_get_current_cpu_index ()
{
unsigned cpu, node;
syscall (__NR_getcpu, &cpu, &node, 0);
return cpu;
}
static inline u32
clib_get_current_numa_node ()
{
unsigned cpu, node;
syscall (__NR_getcpu, &cpu, &node, 0);
return node;
}
#if defined(__x86_64__)
#include "cpuid.h"
static inline int
clib_get_cpuid (const u32 lev, u32 * eax, u32 * ebx, u32 * ecx, u32 * edx)
{
if ((u32) __get_cpuid_max (0x80000000 & lev, 0) < lev)
return 0;
if (lev == 7)
__cpuid_count (lev, 0, *eax, *ebx, *ecx, *edx);
else
__cpuid (lev, *eax, *ebx, *ecx, *edx);
return 1;
}
#define _(flag, func, reg, bit) \
static inline int \
clib_cpu_supports_ ## flag() \
{ \
u32 __attribute__((unused)) eax, ebx = 0, ecx = 0, edx = 0; \
clib_get_cpuid (func, &eax, &ebx, &ecx, &edx); \
\
return ((reg & (1 << bit)) != 0); \
}
foreach_x86_64_flags
#undef _
#else /* __x86_64__ */
#define _(flag, func, reg, bit) \
static inline int clib_cpu_supports_ ## flag() { return 0; }
foreach_x86_64_flags
#undef _
#endif /* __x86_64__ */
#if defined(__aarch64__)
#include <sys/auxv.h>
#define _(flag, bit) \
static inline int \
clib_cpu_supports_ ## flag() \
{ \
unsigned long hwcap = getauxval(AT_HWCAP); \
return (hwcap & (1 << bit)); \
}
foreach_aarch64_flags
#undef _
#else /* ! __x86_64__ && !__aarch64__ */
#define _(flag, bit) \
static inline int clib_cpu_supports_ ## flag() { return 0; }
foreach_aarch64_flags
#undef _
#endif /* __x86_64__, __aarch64__ */
/*
* aes is the only feature with the same name in both flag lists
* handle this by prefixing it with the arch name, and handling it
* with the custom function below
*/
static inline int
clib_cpu_supports_aes ()
{
#if defined (__aarch64__)
return clib_cpu_supports_x86_aes ();
#elif defined (__aarch64__)
return clib_cpu_supports_aarch64_aes ();
#else
return 0;
#endif
}
static inline int
clib_cpu_march_priority_avx512 ()
{
if (clib_cpu_supports_avx512f ())
return 20;
return -1;
}
static inline int
clib_cpu_march_priority_avx2 ()
{
if (clib_cpu_supports_avx2 ())
return 10;
return -1;
}
static inline u32
clib_cpu_implementer ()
{
char buf[128];
static u32 implementer = -1;
if (-1 != implementer)
return implementer;
FILE *fp = fopen ("/proc/cpuinfo", "r");
if (!fp)
return implementer;
while (!feof (fp))
{
if (!fgets (buf, sizeof (buf), fp))
break;
buf[127] = '\0';
if (strstr (buf, "CPU implementer"))
implementer = (u32) strtol (memchr (buf, ':', 128) + 2, NULL, 0);
if (-1 != implementer)
break;
}
fclose (fp);
return implementer;
}
static inline u32
clib_cpu_part ()
{
char buf[128];
static u32 part = -1;
if (-1 != part)
return part;
FILE *fp = fopen ("/proc/cpuinfo", "r");
if (!fp)
return part;
while (!feof (fp))
{
if (!fgets (buf, sizeof (buf), fp))
break;
buf[127] = '\0';
if (strstr (buf, "CPU part"))
part = (u32) strtol (memchr (buf, ':', 128) + 2, NULL, 0);
if (-1 != part)
break;
}
fclose (fp);
return part;
}
#define AARCH64_CPU_IMPLEMENTER_THUNERDERX2 0x43
#define AARCH64_CPU_PART_THUNERDERX2 0x0af
#define AARCH64_CPU_IMPLEMENTER_QDF24XX 0x51
#define AARCH64_CPU_PART_QDF24XX 0xc00
#define AARCH64_CPU_IMPLEMENTER_CORTEXA72 0x41
#define AARCH64_CPU_PART_CORTEXA72 0xd08
static inline int
clib_cpu_march_priority_thunderx2t99 ()
{
if ((AARCH64_CPU_IMPLEMENTER_THUNERDERX2 == clib_cpu_implementer ()) &&
(AARCH64_CPU_PART_THUNERDERX2 == clib_cpu_part ()))
return 20;
return -1;
}
static inline int
clib_cpu_march_priority_qdf24xx ()
{
if ((AARCH64_CPU_IMPLEMENTER_QDF24XX == clib_cpu_implementer ()) &&
(AARCH64_CPU_PART_QDF24XX == clib_cpu_part ()))
return 20;
return -1;
}
static inline int
clib_cpu_march_priority_cortexa72 ()
{
if ((AARCH64_CPU_IMPLEMENTER_CORTEXA72 == clib_cpu_implementer ()) &&
(AARCH64_CPU_PART_CORTEXA72 == clib_cpu_part ()))
return 10;
return -1;
}
#ifdef CLIB_MARCH_VARIANT
#define CLIB_MARCH_FN_PRIORITY() CLIB_MARCH_SFX(clib_cpu_march_priority)()
#else
#define CLIB_MARCH_FN_PRIORITY() 0
#endif
#endif /* included_clib_cpu_h */
#define CLIB_MARCH_FN_CONSTRUCTOR(fn) \
static void __clib_constructor \
CLIB_MARCH_SFX(fn ## _march_constructor) (void) \
{ \
if (CLIB_MARCH_FN_PRIORITY() > fn ## _selected_priority) \
{ \
fn ## _selected = & CLIB_MARCH_SFX (fn ## _ma); \
fn ## _selected_priority = CLIB_MARCH_FN_PRIORITY(); \
} \
} \
#ifndef CLIB_MARCH_VARIANT
#define CLIB_MARCH_FN(fn, rtype, _args...) \
static rtype CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (fn ## _ma)(_args); \
rtype (*fn ## _selected) (_args) = & CLIB_MARCH_SFX (fn ## _ma); \
int fn ## _selected_priority = 0; \
static inline rtype CLIB_CPU_OPTIMIZED \
CLIB_MARCH_SFX (fn ## _ma)(_args)
#else
#define CLIB_MARCH_FN(fn, rtype, _args...) \
static rtype CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (fn ## _ma)(_args); \
extern int (*fn ## _selected) (_args); \
extern int fn ## _selected_priority; \
CLIB_MARCH_FN_CONSTRUCTOR (fn) \
static rtype CLIB_CPU_OPTIMIZED CLIB_MARCH_SFX (fn ## _ma)(_args)
#endif
#define CLIB_MARCH_FN_SELECT(fn) (* fn ## _selected)
format_function_t format_cpu_uarch;
format_function_t format_cpu_model_name;
format_function_t format_cpu_flags;
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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