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verbs: Support the PROCMAP_QUERY ioctl #1693

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verbs: Support the PROCMAP_QUERY ioctl #1693

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42 changes: 39 additions & 3 deletions libibverbs/memory.c
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,10 @@
#include <dirent.h>
#include <limits.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/fs.h>

#include "ibverbs.h"
#include "util/rdma_nl.h"
Expand Down Expand Up @@ -90,11 +94,42 @@ static unsigned long smaps_page_size(FILE *file)
static unsigned long get_page_size(void *base)
{
unsigned long ret = page_size;
pid_t pid;
pid_t pid = getpid();
FILE *file;
char buf[1024];
#ifdef PROCMAP_QUERY
static bool procmap_query_unavailable;

if (!procmap_query_unavailable) {
struct procmap_query query = {};
int fd;
bool success;

snprintf(buf, sizeof(buf), "/proc/%d/maps", pid);

fd = open(buf, O_RDONLY);
if (fd >= 0) {
query.size = sizeof(query);
query.query_addr = (uintptr_t)base;

if (ioctl(fd, PROCMAP_QUERY, &query) >= 0) {
ret = query.vma_page_size;
success = true;
} else if (errno == ENOENT)
success = true;
else
success = false;

close(fd);

if (success)
return ret;

procmap_query_unavailable = true;
}
}
#endif

pid = getpid();
snprintf(buf, sizeof(buf), "/proc/%d/smaps", pid);

file = fopen(buf, "r" STREAM_CLOEXEC);
Expand Down Expand Up @@ -134,7 +169,8 @@ int ibv_fork_init(void)
if (mm_root)
return 0;

if (ibv_is_fork_initialized() == IBV_FORK_UNNEEDED)
if (!check_env("RDMAV_USE_MADVISE") &&
ibv_is_fork_initialized() == IBV_FORK_UNNEEDED)
return 0;

if (too_late)
Expand Down