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/*
* Copyright (c) 2016-2018 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "arm_compute/runtime/IScheduler.h"
#include <array>
#include <cstdlib>
#include <cstring>
#include <fcntl.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace
{
unsigned int get_cpu_impl()
{
#ifndef BARE_METAL
int fd = open("/proc/cpuinfo", 0); // NOLINT
std::array<char, 3000> buff{ {} };
char *pos = nullptr;
char *end = nullptr;
bool foundid = false;
int cpu = sched_getcpu();
if(fd == -1)
{
return 0;
}
int charsread = read(fd, buff.data(), 3000);
pos = buff.data();
end = buff.data() + charsread;
close(fd);
/* So, to date I've encountered two formats for /proc/cpuinfo.
*
* One of them just lists processor : n for each processor (with no
* other info), then at the end lists part information for the current
* CPU.
*
* The other has an entire clause (including part number info) for each
* CPU in the system, with "processor : n" headers.
*
* We can cope with either of these formats by waiting to see
* "processor: n" (where n = our CPU ID), and then looking for the next
* "CPU part" field.
*/
while(pos < end)
{
if(foundid && strncmp(pos, "CPU part", 8) == 0)
{
/* Found part number */
pos += 11;
for(char *ch = pos; ch < end; ch++)
{
if(*ch == '\n')
{
*ch = '\0';
break;
}
}
return strtoul(pos, nullptr, 0);
}
if(strncmp(pos, "processor", 9) == 0)
{
/* Found processor ID, see if it's ours. */
pos += 11;
for(char *ch = pos; ch < end; ch++)
{
if(*ch == '\n')
{
*ch = '\0';
break;
}
}
int num = strtol(pos, nullptr, 0);
if(num == cpu)
{
foundid = true;
}
}
while(pos < end)
{
char ch = *pos++;
if(ch == '\n' || ch == '\0')
{
break;
}
}
}
#endif /* BARE_METAL */
return 0;
}
} // namespace
namespace arm_compute
{
IScheduler::IScheduler()
{
switch(get_cpu_impl())
{
case 0xd0f:
_info.CPU = CPUTarget::A55_DOT;
break;
case 0xd03:
_info.CPU = CPUTarget::A53;
break;
default:
#ifdef __arm__
_info.CPU = CPUTarget::ARMV7;
#elif __aarch64__
_info.CPU = CPUTarget::ARMV8;
#else /* __arm__ || __aarch64__ */
_info.CPU = CPUTarget::INTRINSICS;
#endif /* __arm__ || __aarch64__ */
break;
}
_info.L1_size = 31000;
_info.L2_size = 500000;
}
void IScheduler::set_target(CPUTarget target)
{
_info.CPU = target;
}
CPUInfo IScheduler::cpu_info() const
{
return _info;
}
} // namespace arm_compute
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