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util: add cacheinfo

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Add helpers to gather cache info from the host at init-time.

For now, only export the host's I/D cache line sizes, which we
will use to improve cache locality to avoid false sharing.

Suggested-by: Richard Henderson <rth@twiddle.net>
Suggested-by: Geert Martin Ijewski <gm.ijewski@web.de>
Tested-by:    Geert Martin Ijewski <gm.ijewski@web.de>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1496794624-4083-1-git-send-email-cota@braap.org>
[rth: Move all implementations from tcg/ppc/]
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2017-06-06 20:17:04 -04:00 • committed by Richard Henderson
parent cef8fd6836
commit b255b2c8a5
4 changed files with 191 additions and 69 deletions
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71
tcg/ppc/tcg-target.inc.c
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@ -2820,14 +2820,11 @@ void tcg_register_jit(void *buf, size_t buf_size)
}
#endif /* __ELF__ */
static size_t dcache_bsize = 16;
static size_t icache_bsize = 16;
void flush_icache_range(uintptr_t start, uintptr_t stop)
{
uintptr_t p, start1, stop1;
size_t dsize = dcache_bsize;
size_t isize = icache_bsize;
size_t dsize = qemu_dcache_linesize;
size_t isize = qemu_icache_linesize;
start1 = start & ~(dsize - 1);
stop1 = (stop + dsize - 1) & ~(dsize - 1);
@ -2844,67 +2841,3 @@ void flush_icache_range(uintptr_t start, uintptr_t stop)
asm volatile ("sync" : : : "memory");
asm volatile ("isync" : : : "memory");
}
#if defined _AIX
#include <sys/systemcfg.h>
static void __attribute__((constructor)) tcg_cache_init(void)
{
icache_bsize = _system_configuration.icache_line;
dcache_bsize = _system_configuration.dcache_line;
}
#elif defined __linux__
static void __attribute__((constructor)) tcg_cache_init(void)
{
unsigned long dsize = qemu_getauxval(AT_DCACHEBSIZE);
unsigned long isize = qemu_getauxval(AT_ICACHEBSIZE);
if (dsize == 0 || isize == 0) {
if (dsize == 0) {
fprintf(stderr, "getauxval AT_DCACHEBSIZE failed\n");
}
if (isize == 0) {
fprintf(stderr, "getauxval AT_ICACHEBSIZE failed\n");
}
exit(1);
}
dcache_bsize = dsize;
icache_bsize = isize;
}
#elif defined __APPLE__
#include <sys/sysctl.h>
static void __attribute__((constructor)) tcg_cache_init(void)
{
size_t len;
unsigned cacheline;
int name[2] = { CTL_HW, HW_CACHELINE };
len = sizeof(cacheline);
if (sysctl(name, 2, &cacheline, &len, NULL, 0)) {
perror("sysctl CTL_HW HW_CACHELINE failed");
exit(1);
}
dcache_bsize = cacheline;
icache_bsize = cacheline;
}
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/sysctl.h>
static void __attribute__((constructor)) tcg_cache_init(void)
{
size_t len = 4;
unsigned cacheline;
if (sysctlbyname ("machdep.cacheline_size", &cacheline, &len, NULL, 0)) {
fprintf(stderr, "sysctlbyname machdep.cacheline_size failed: %s\n",
strerror(errno));
exit(1);
}
dcache_bsize = cacheline;
icache_bsize = cacheline;
}
#endif