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/*
// Copyright (c) 2017 Intel Corporation
//
// 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.
*/
#include <immintrin.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <stdint.h>
#include "rte_atomic.h"
#include "tsx.h"
int max_retries = 3;
static void
run_cpuid (uint32_t eax, uint32_t ecx, uint32_t *abcd)
{
uint32_t ebx = 0, edx = 0;
#if defined(__i386__) && defined (__PIC__)
/* in case of PIC under 32-bit EBX cannot be clobbered */
__asm__ ("movl %%ebx, %%edi \n\t cpuid \n\t xchgl %%ebx, %%edi":"=D" (ebx),
#else
__asm__ ("cpuid":"+b" (ebx),
#endif
"+a" (eax), "+c" (ecx), "=d" (edx));
abcd[0] = eax;
abcd[1] = ebx;
abcd[2] = ecx;
abcd[3] = edx;
}
static int
check_xcr0_ymm (void)
{
uint32_t xcr0;
__asm__ ("xgetbv" : "=a" (xcr0) : "c" (0) : "%edx");
return ((xcr0 & 6) == 6);/* checking if xmm and ymm state are enabled in XCR0 */
}
static int
check_4th_gen_intel_core_features (void)
{
uint32_t abcd[4];
uint32_t fma_movbe_osxsave_mask = ((1 << 12) | (1 << 22) | (1 << 27));
uint32_t avx2_bmi12_mask = (1 << 5) | (1 << 3) | (1 << 8);
/* CPUID.(EAX=01H, ECX=0H):ECX.FMA[bit 12]==1 &&
CPUID.(EAX=01H, ECX=0H):ECX.MOVBE[bit 22]==1 &&
CPUID.(EAX=01H, ECX=0H):ECX.OSXSAVE[bit 27]==1 */
run_cpuid (1, 0, abcd);
if ((abcd[2] & fma_movbe_osxsave_mask) != fma_movbe_osxsave_mask) {
printf ("Failing in if cond-1\n");
return 0;
}
if (!check_xcr0_ymm ()) {
printf ("Failing in if cond-2\n");
return 0;
}
/* CPUID.(EAX=07H, ECX=0H):EBX.AVX2[bit 5]==1 &&
CPUID.(EAX=07H, ECX=0H):EBX.BMI1[bit 3]==1 &&
CPUID.(EAX=07H, ECX=0H):EBX.BMI2[bit 8]==1 */
run_cpuid (7, 0, abcd);
if ((abcd[1] & avx2_bmi12_mask) != avx2_bmi12_mask) {
printf ("Failing in if cond-3\n");
return 0;
}
/* CPUID.(EAX=80000001H):ECX.LZCNT[bit 5]==1 */
run_cpuid (0x80000001, 0, abcd);
if ((abcd[2] & (1 << 5)) == 0) {
printf ("Failing in if cond-4\n");
return 0;
}
/* CPUID.(EAX=07H, ECX=0H).EBX.RTM[bit 11]==1 */
run_cpuid (7, 0, abcd);
if ((abcd[1] & (1 << 11)) == 0) {
printf ("Failing in if cond-5\n");
return 0;
}
/* CPUID.(EAX=07H, ECX=0H).EBX.HLE[bit 4]==1 */
run_cpuid (7, 0, abcd);
if ((abcd[1] & (1 << 4)) == 0) {
printf ("Failing in if cond-6\n");
return 0;
}
return 1;
}
int
can_use_intel_core_4th_gen_features (void)
{
static int the_4th_gen_features_available = -1;
/* test is performed once */
if (the_4th_gen_features_available < 0)
the_4th_gen_features_available = check_4th_gen_intel_core_features ();
return the_4th_gen_features_available;
}
void
rtm_init (void)
{
naborted = (rte_atomic64_t) RTE_ATOMIC64_INIT (0);
//RTE_ATOMIC64_INIT(naborted);
} int
rtm_lock (void)
{
int nretries = 0;
while (1) {
++nretries;
unsigned int status = _xbegin ();
if (status == _XBEGIN_STARTED) {
if (!is_hle_locked ())
return 1; // successfully started transaction
// started transaction but someone executes the transaction section
// non-speculatively (acquired the fall-back lock)
_xabort (0xff); // abort with code 0xff
}
// abort handler
rte_atomic64_inc (&naborted); // do abort statistics
printf
("DEBUG: Transaction aborted: %d time(s) with the status: %u\n",
nretries, status);
// handle _xabort(0xff) from above
if ((status & _XABORT_EXPLICIT)
&& _XABORT_CODE (status) == 0xff && !(status & _XABORT_NESTED)) {
while (is_hle_locked ())
_mm_pause (); // wait until lock is free
}
else if (!(status & _XABORT_RETRY))
break; // take the fall-back lock if the retry abort flag is not set
if (nretries >= max_retries)
break; // too many retries, take the fall-back lock
}
hle_lock ();
return 1;
}
int
rtm_unlock (void)
{
if (is_hle_locked ())
hle_release ();
else
_xend ();
return 1;
}
int
is_rtm_locked (void)
{
return ((int) _xtest ());
}
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