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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2014-2020, Intel Corporation */
#include <string.h>
#include <xmmintrin.h>
#include "auto_flush.h"
#include "cpu.h"
#include "flush.h"
#include "memcpy_memset.h"
#include "os.h"
#include "out.h"
#include "pmem2_arch.h"
#include "valgrind_internal.h"
#define MOVNT_THRESHOLD 256
size_t Movnt_threshold = MOVNT_THRESHOLD;
/*
* memory_barrier -- (internal) issue the fence instruction
*/
static void
memory_barrier(void)
{
LOG(15, NULL);
_mm_sfence(); /* ensure CLWB or CLFLUSHOPT completes */
}
/*
* flush_clflush -- (internal) flush the CPU cache, using clflush
*/
static void
flush_clflush(const void *addr, size_t len)
{
LOG(15, "addr %p len %zu", addr, len);
flush_clflush_nolog(addr, len);
}
/*
* flush_clflushopt -- (internal) flush the CPU cache, using clflushopt
*/
static void
flush_clflushopt(const void *addr, size_t len)
{
LOG(15, "addr %p len %zu", addr, len);
flush_clflushopt_nolog(addr, len);
}
/*
* flush_clwb -- (internal) flush the CPU cache, using clwb
*/
static void
flush_clwb(const void *addr, size_t len)
{
LOG(15, "addr %p len %zu", addr, len);
flush_clwb_nolog(addr, len);
}
#if SSE2_AVAILABLE || AVX_AVAILABLE || AVX512F_AVAILABLE
#define PMEM2_F_MEM_MOVNT (PMEM2_F_MEM_WC | PMEM2_F_MEM_NONTEMPORAL)
#define PMEM2_F_MEM_MOV (PMEM2_F_MEM_WB | PMEM2_F_MEM_TEMPORAL)
#define MEMCPY_TEMPLATE(isa, flush, perfbarrier) \
static void *\
memmove_nodrain_##isa##_##flush##perfbarrier(void *dest, const void *src, \
size_t len, unsigned flags, flush_func flushf)\
{\
if (len == 0 || src == dest)\
return dest;\
\
if (flags & PMEM2_F_MEM_NOFLUSH) \
memmove_mov_##isa##_noflush(dest, src, len); \
else if (flags & PMEM2_F_MEM_MOVNT)\
memmove_movnt_##isa ##_##flush##perfbarrier(dest, src, len);\
else if (flags & PMEM2_F_MEM_MOV)\
memmove_mov_##isa##_##flush(dest, src, len);\
else if (len < Movnt_threshold)\
memmove_mov_##isa##_##flush(dest, src, len);\
else\
memmove_movnt_##isa##_##flush##perfbarrier(dest, src, len);\
\
return dest;\
}
#define MEMCPY_TEMPLATE_EADR(isa, perfbarrier) \
static void *\
memmove_nodrain_##isa##_eadr##perfbarrier(void *dest, const void *src, \
size_t len, unsigned flags, flush_func flushf)\
{\
if (len == 0 || src == dest)\
return dest;\
\
if (flags & PMEM2_F_MEM_NOFLUSH)\
memmove_mov_##isa##_noflush(dest, src, len);\
else if (flags & PMEM2_F_MEM_NONTEMPORAL)\
memmove_movnt_##isa##_empty##perfbarrier(dest, src, len);\
else\
memmove_mov_##isa##_empty(dest, src, len);\
\
return dest;\
}
#define MEMSET_TEMPLATE(isa, flush, perfbarrier)\
static void *\
memset_nodrain_##isa##_##flush##perfbarrier(void *dest, int c, size_t len, \
unsigned flags, flush_func flushf)\
{\
if (len == 0)\
return dest;\
\
if (flags & PMEM2_F_MEM_NOFLUSH) \
memset_mov_##isa##_noflush(dest, c, len); \
else if (flags & PMEM2_F_MEM_MOVNT)\
memset_movnt_##isa##_##flush##perfbarrier(dest, c, len);\
else if (flags & PMEM2_F_MEM_MOV)\
memset_mov_##isa##_##flush(dest, c, len);\
else if (len < Movnt_threshold)\
memset_mov_##isa##_##flush(dest, c, len);\
else\
memset_movnt_##isa##_##flush##perfbarrier(dest, c, len);\
\
return dest;\
}
#define MEMSET_TEMPLATE_EADR(isa, perfbarrier) \
static void *\
memset_nodrain_##isa##_eadr##perfbarrier(void *dest, int c, size_t len, \
unsigned flags, flush_func flushf)\
{\
if (len == 0)\
return dest;\
\
if (flags & PMEM2_F_MEM_NOFLUSH)\
memset_mov_##isa##_noflush(dest, c, len);\
else if (flags & PMEM2_F_MEM_NONTEMPORAL)\
memset_movnt_##isa##_empty##perfbarrier(dest, c, len);\
else\
memset_mov_##isa##_empty(dest, c, len);\
\
return dest;\
}
#endif
#if SSE2_AVAILABLE
MEMCPY_TEMPLATE(sse2, clflush, _nobarrier)
MEMCPY_TEMPLATE(sse2, clflushopt, _nobarrier)
MEMCPY_TEMPLATE(sse2, clwb, _nobarrier)
MEMCPY_TEMPLATE_EADR(sse2, _nobarrier)
MEMSET_TEMPLATE(sse2, clflush, _nobarrier)
MEMSET_TEMPLATE(sse2, clflushopt, _nobarrier)
MEMSET_TEMPLATE(sse2, clwb, _nobarrier)
MEMSET_TEMPLATE_EADR(sse2, _nobarrier)
MEMCPY_TEMPLATE(sse2, clflush, _wcbarrier)
MEMCPY_TEMPLATE(sse2, clflushopt, _wcbarrier)
MEMCPY_TEMPLATE(sse2, clwb, _wcbarrier)
MEMCPY_TEMPLATE_EADR(sse2, _wcbarrier)
MEMSET_TEMPLATE(sse2, clflush, _wcbarrier)
MEMSET_TEMPLATE(sse2, clflushopt, _wcbarrier)
MEMSET_TEMPLATE(sse2, clwb, _wcbarrier)
MEMSET_TEMPLATE_EADR(sse2, _wcbarrier)
#endif
#if AVX_AVAILABLE
MEMCPY_TEMPLATE(avx, clflush, _nobarrier)
MEMCPY_TEMPLATE(avx, clflushopt, _nobarrier)
MEMCPY_TEMPLATE(avx, clwb, _nobarrier)
MEMCPY_TEMPLATE_EADR(avx, _nobarrier)
MEMSET_TEMPLATE(avx, clflush, _nobarrier)
MEMSET_TEMPLATE(avx, clflushopt, _nobarrier)
MEMSET_TEMPLATE(avx, clwb, _nobarrier)
MEMSET_TEMPLATE_EADR(avx, _nobarrier)
MEMCPY_TEMPLATE(avx, clflush, _wcbarrier)
MEMCPY_TEMPLATE(avx, clflushopt, _wcbarrier)
MEMCPY_TEMPLATE(avx, clwb, _wcbarrier)
MEMCPY_TEMPLATE_EADR(avx, _wcbarrier)
MEMSET_TEMPLATE(avx, clflush, _wcbarrier)
MEMSET_TEMPLATE(avx, clflushopt, _wcbarrier)
MEMSET_TEMPLATE(avx, clwb, _wcbarrier)
MEMSET_TEMPLATE_EADR(avx, _wcbarrier)
#endif
#if AVX512F_AVAILABLE
MEMCPY_TEMPLATE(avx512f, clflush, /* cstyle wa */)
MEMCPY_TEMPLATE(avx512f, clflushopt, /* */)
MEMCPY_TEMPLATE(avx512f, clwb, /* */)
MEMCPY_TEMPLATE_EADR(avx512f, /* */)
MEMSET_TEMPLATE(avx512f, clflush, /* */)
MEMSET_TEMPLATE(avx512f, clflushopt, /* */)
MEMSET_TEMPLATE(avx512f, clwb, /* */)
MEMSET_TEMPLATE_EADR(avx512f, /* */)
#endif
enum memcpy_impl {
MEMCPY_INVALID,
MEMCPY_SSE2,
MEMCPY_AVX,
MEMCPY_AVX512F
};
/*
* use_sse2_memcpy_memset -- (internal) SSE2 detected, use it if possible
*/
static void
use_sse2_memcpy_memset(struct pmem2_arch_info *info, enum memcpy_impl *impl,
int wc_workaround)
{
#if SSE2_AVAILABLE
*impl = MEMCPY_SSE2;
if (wc_workaround) {
info->memmove_nodrain_eadr =
memmove_nodrain_sse2_eadr_wcbarrier;
if (info->flush == flush_clflush)
info->memmove_nodrain =
memmove_nodrain_sse2_clflush_wcbarrier;
else if (info->flush == flush_clflushopt)
info->memmove_nodrain =
memmove_nodrain_sse2_clflushopt_wcbarrier;
else if (info->flush == flush_clwb)
info->memmove_nodrain =
memmove_nodrain_sse2_clwb_wcbarrier;
else
ASSERT(0);
info->memset_nodrain_eadr = memset_nodrain_sse2_eadr_wcbarrier;
if (info->flush == flush_clflush)
info->memset_nodrain =
memset_nodrain_sse2_clflush_wcbarrier;
else if (info->flush == flush_clflushopt)
info->memset_nodrain =
memset_nodrain_sse2_clflushopt_wcbarrier;
else if (info->flush == flush_clwb)
info->memset_nodrain =
memset_nodrain_sse2_clwb_wcbarrier;
else
ASSERT(0);
} else {
info->memmove_nodrain_eadr =
memmove_nodrain_sse2_eadr_nobarrier;
if (info->flush == flush_clflush)
info->memmove_nodrain =
memmove_nodrain_sse2_clflush_nobarrier;
else if (info->flush == flush_clflushopt)
info->memmove_nodrain =
memmove_nodrain_sse2_clflushopt_nobarrier;
else if (info->flush == flush_clwb)
info->memmove_nodrain =
memmove_nodrain_sse2_clwb_nobarrier;
else
ASSERT(0);
info->memset_nodrain_eadr =
memset_nodrain_sse2_eadr_nobarrier;
if (info->flush == flush_clflush)
info->memset_nodrain =
memset_nodrain_sse2_clflush_nobarrier;
else if (info->flush == flush_clflushopt)
info->memset_nodrain =
memset_nodrain_sse2_clflushopt_nobarrier;
else if (info->flush == flush_clwb)
info->memset_nodrain =
memset_nodrain_sse2_clwb_nobarrier;
else
ASSERT(0);
}
#else
LOG(3, "sse2 disabled at build time");
#endif
}
/*
* use_avx_memcpy_memset -- (internal) AVX detected, use it if possible
*/
static void
use_avx_memcpy_memset(struct pmem2_arch_info *info, enum memcpy_impl *impl,
int wc_workaround)
{
#if AVX_AVAILABLE
LOG(3, "avx supported");
char *e = os_getenv("PMEM_AVX");
if (e != NULL && strcmp(e, "0") == 0) {
LOG(3, "PMEM_AVX set to 0");
return;
}
LOG(3, "PMEM_AVX enabled");
*impl = MEMCPY_AVX;
if (wc_workaround) {
info->memmove_nodrain_eadr =
memmove_nodrain_avx_eadr_wcbarrier;
if (info->flush == flush_clflush)
info->memmove_nodrain =
memmove_nodrain_avx_clflush_wcbarrier;
else if (info->flush == flush_clflushopt)
info->memmove_nodrain =
memmove_nodrain_avx_clflushopt_wcbarrier;
else if (info->flush == flush_clwb)
info->memmove_nodrain =
memmove_nodrain_avx_clwb_wcbarrier;
else
ASSERT(0);
info->memset_nodrain_eadr =
memset_nodrain_avx_eadr_wcbarrier;
if (info->flush == flush_clflush)
info->memset_nodrain =
memset_nodrain_avx_clflush_wcbarrier;
else if (info->flush == flush_clflushopt)
info->memset_nodrain =
memset_nodrain_avx_clflushopt_wcbarrier;
else if (info->flush == flush_clwb)
info->memset_nodrain =
memset_nodrain_avx_clwb_wcbarrier;
else
ASSERT(0);
} else {
info->memmove_nodrain_eadr =
memmove_nodrain_avx_eadr_nobarrier;
if (info->flush == flush_clflush)
info->memmove_nodrain =
memmove_nodrain_avx_clflush_nobarrier;
else if (info->flush == flush_clflushopt)
info->memmove_nodrain =
memmove_nodrain_avx_clflushopt_nobarrier;
else if (info->flush == flush_clwb)
info->memmove_nodrain =
memmove_nodrain_avx_clwb_nobarrier;
else
ASSERT(0);
info->memset_nodrain_eadr =
memset_nodrain_avx_eadr_nobarrier;
if (info->flush == flush_clflush)
info->memset_nodrain =
memset_nodrain_avx_clflush_nobarrier;
else if (info->flush == flush_clflushopt)
info->memset_nodrain =
memset_nodrain_avx_clflushopt_nobarrier;
else if (info->flush == flush_clwb)
info->memset_nodrain =
memset_nodrain_avx_clwb_nobarrier;
else
ASSERT(0);
}
#else
LOG(3, "avx supported, but disabled at build time");
#endif
}
/*
* use_avx512f_memcpy_memset -- (internal) AVX512F detected, use it if possible
*/
static void
use_avx512f_memcpy_memset(struct pmem2_arch_info *info,
enum memcpy_impl *impl)
{
#if AVX512F_AVAILABLE
LOG(3, "avx512f supported");
char *e = os_getenv("PMEM_AVX512F");
if (e != NULL && strcmp(e, "0") == 0) {
LOG(3, "PMEM_AVX512F set to 0");
return;
}
LOG(3, "PMEM_AVX512F enabled");
*impl = MEMCPY_AVX512F;
info->memmove_nodrain_eadr = memmove_nodrain_avx512f_eadr;
if (info->flush == flush_clflush)
info->memmove_nodrain = memmove_nodrain_avx512f_clflush;
else if (info->flush == flush_clflushopt)
info->memmove_nodrain = memmove_nodrain_avx512f_clflushopt;
else if (info->flush == flush_clwb)
info->memmove_nodrain = memmove_nodrain_avx512f_clwb;
else
ASSERT(0);
info->memset_nodrain_eadr = memset_nodrain_avx512f_eadr;
if (info->flush == flush_clflush)
info->memset_nodrain = memset_nodrain_avx512f_clflush;
else if (info->flush == flush_clflushopt)
info->memset_nodrain = memset_nodrain_avx512f_clflushopt;
else if (info->flush == flush_clwb)
info->memset_nodrain = memset_nodrain_avx512f_clwb;
else
ASSERT(0);
#else
LOG(3, "avx512f supported, but disabled at build time");
#endif
}
/*
* pmem_get_cpuinfo -- configure libpmem based on CPUID
*/
static void
pmem_cpuinfo_to_funcs(struct pmem2_arch_info *info, enum memcpy_impl *impl)
{
LOG(3, NULL);
if (is_cpu_clflush_present()) {
LOG(3, "clflush supported");
info->flush = flush_clflush;
info->flush_has_builtin_fence = 1;
info->fence = memory_barrier;
}
if (is_cpu_clflushopt_present()) {
LOG(3, "clflushopt supported");
char *e = os_getenv("PMEM_NO_CLFLUSHOPT");
if (e && strcmp(e, "1") == 0) {
LOG(3, "PMEM_NO_CLFLUSHOPT forced no clflushopt");
} else {
info->flush = flush_clflushopt;
info->flush_has_builtin_fence = 0;
info->fence = memory_barrier;
}
}
if (is_cpu_clwb_present()) {
LOG(3, "clwb supported");
char *e = os_getenv("PMEM_NO_CLWB");
if (e && strcmp(e, "1") == 0) {
LOG(3, "PMEM_NO_CLWB forced no clwb");
} else {
info->flush = flush_clwb;
info->flush_has_builtin_fence = 0;
info->fence = memory_barrier;
}
}
/*
* XXX Disable this work around for Intel CPUs with optimized
* WC eviction.
*/
int wc_workaround = is_cpu_genuine_intel();
char *ptr = os_getenv("PMEM_WC_WORKAROUND");
if (ptr) {
if (strcmp(ptr, "1") == 0) {
LOG(3, "WC workaround forced to 1");
wc_workaround = 1;
} else if (strcmp(ptr, "0") == 0) {
LOG(3, "WC workaround forced to 0");
wc_workaround = 0;
} else {
LOG(3, "incorrect value of PMEM_WC_WORKAROUND (%s)",
ptr);
}
}
LOG(3, "WC workaround = %d", wc_workaround);
ptr = os_getenv("PMEM_NO_MOVNT");
if (ptr && strcmp(ptr, "1") == 0) {
LOG(3, "PMEM_NO_MOVNT forced no movnt");
} else {
use_sse2_memcpy_memset(info, impl, wc_workaround);
if (is_cpu_avx_present())
use_avx_memcpy_memset(info, impl, wc_workaround);
if (is_cpu_avx512f_present())
use_avx512f_memcpy_memset(info, impl);
}
}
/*
* pmem2_arch_init -- initialize architecture-specific list of pmem operations
*/
void
pmem2_arch_init(struct pmem2_arch_info *info)
{
LOG(3, NULL);
enum memcpy_impl impl = MEMCPY_INVALID;
pmem_cpuinfo_to_funcs(info, &impl);
/*
* For testing, allow overriding the default threshold
* for using non-temporal stores in pmem_memcpy_*(), pmem_memmove_*()
* and pmem_memset_*().
* It has no effect if movnt is not supported or disabled.
*/
const char *ptr = os_getenv("PMEM_MOVNT_THRESHOLD");
if (ptr) {
long long val = atoll(ptr);
if (val < 0) {
LOG(3, "Invalid PMEM_MOVNT_THRESHOLD");
} else {
LOG(3, "PMEM_MOVNT_THRESHOLD set to %zu", (size_t)val);
Movnt_threshold = (size_t)val;
}
}
if (info->flush == flush_clwb)
LOG(3, "using clwb");
else if (info->flush == flush_clflushopt)
LOG(3, "using clflushopt");
else if (info->flush == flush_clflush)
LOG(3, "using clflush");
else
FATAL("invalid deep flush function address");
if (impl == MEMCPY_AVX512F)
LOG(3, "using movnt AVX512F");
else if (impl == MEMCPY_AVX)
LOG(3, "using movnt AVX");
else if (impl == MEMCPY_SSE2)
LOG(3, "using movnt SSE2");
}
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