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/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2009-2010 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/ummunotify.h>
#include "opal_stdint.h"
#include "opal/constants.h"
#include "opal/util/output.h"
#include "opal/util/show_help.h"
#include "opal/mca/memory/memory.h"
#include "opal/memoryhooks/memory.h"
#include "opal/memoryhooks/memory_internal.h"
#include "opal/mca/memory/linux/memory_linux.h"
#include "opal/mca/memory/linux/public.h"
#define DEV_UMMUNOTIFY "/dev/ummunotify"
/*
* Local functions
*/
static int ummunotify_process(void);
static int ummunotify_register(void *start, size_t len, uint64_t cookie);
static int ummunotify_deregister(void *start, size_t len, uint64_t cookie);
/*
* Local variables
*/
static bool initialized = false;
/*
* Global variables (these need to be global variables rather than in
* the component struct because they are accessed in the
* opal_memory_changed() macro defined in public.h, and we don't want
* to have to include the component structure definition in public.h).
*/
uint64_t opal_memory_linux_ummunotify_counter_last_value = 0;
volatile uint64_t *opal_memory_linux_ummunotify_counter =
&opal_memory_linux_ummunotify_counter_last_value;
int opal_memory_linux_ummunotify_open(void)
{
uint64_t *p;
/* Just to be safe... */
opal_memory_linux_ummunotify_counter_last_value = 0;
opal_memory_linux_ummunotify_counter =
&opal_memory_linux_ummunotify_counter_last_value;
/* Open the device. Try to give a meaningful error message if
we're unable to open it. */
mca_memory_linux_component.ummunotify_fd =
open(DEV_UMMUNOTIFY, O_RDONLY | O_NONBLOCK);
if (mca_memory_linux_component.ummunotify_fd < 0) {
char hostname[HOST_NAME_MAX];
gethostname(hostname, sizeof(hostname));
if (EACCES == errno) {
/* This will get a proper show_help when merged into the
linux component */
opal_show_help("help-opal-memory-linux.txt",
"ummunotify eaccess", true,
hostname, DEV_UMMUNOTIFY);
} else if (ENOENT != errno) {
/* Don't print an error if DEV_UMMUNOTIFY simply doesn't exist */
opal_show_help("help-opal-memory-linux.txt",
"ummunotify open error", true,
hostname, DEV_UMMUNOTIFY,
strerror(errno), errno);
}
return OPAL_ERR_NOT_SUPPORTED;
}
p = mmap(NULL, sizeof(*opal_memory_linux_ummunotify_counter),
PROT_READ, MAP_SHARED,
mca_memory_linux_component.ummunotify_fd, 0);
if (MAP_FAILED == opal_memory_linux_ummunotify_counter) {
close(mca_memory_linux_component.ummunotify_fd);
mca_memory_linux_component.ummunotify_fd = -1;
return OPAL_ERR_NOT_SUPPORTED;
}
opal_memory_linux_ummunotify_counter = p;
/* If everything went well, tell OMPI that we have full support
for the memory hooks and fill in the component function
pointers */
opal_mem_hooks_set_support(OPAL_MEMORY_FREE_SUPPORT |
OPAL_MEMORY_CHUNK_SUPPORT |
OPAL_MEMORY_MUNMAP_SUPPORT);
mca_memory_linux_component.super.memoryc_process = ummunotify_process;
mca_memory_linux_component.super.memoryc_register = ummunotify_register;
mca_memory_linux_component.super.memoryc_deregister = ummunotify_deregister;
initialized = true;
return OPAL_SUCCESS;
}
/*
* Called during opal_finalize (usually during MPI_FINALIZE) to tear
* down anything that can/should be torn down to disable this
* component. The application may continue for a while after
* MPI_FINALIZE, so we should do as much as possible to disable
* anything we enabled during ummunotify_open().
*/
int opal_memory_linux_ummunotify_close(void)
{
if (initialized && mca_memory_linux_component.ummunotify_fd >= 0) {
munmap((void*) opal_memory_linux_ummunotify_counter,
sizeof(*opal_memory_linux_ummunotify_counter));
close(mca_memory_linux_component.ummunotify_fd);
mca_memory_linux_component.ummunotify_fd = -1;
opal_memory_linux_ummunotify_counter =
&opal_memory_linux_ummunotify_counter_last_value;
initialized = false;
}
return OPAL_SUCCESS;
}
/*
* Called when opal_memory_changed() returns 1
*/
static int ummunotify_process(void)
{
int n;
unsigned int i;
struct ummunotify_event events[128];
/* Loop reading from the ummunot fd until there's nothing left to
read. If we get a LAST event, re-record the counter. */
while (initialized) {
n = read(mca_memory_linux_component.ummunotify_fd,
&events, sizeof(events));
if (n <= 0) {
return (EAGAIN == errno) ? OPAL_SUCCESS : OPAL_ERR_IN_ERRNO;
}
for (i = 0; i < n / sizeof(events[0]); ++i) {
switch (events[i].type) {
case UMMUNOTIFY_EVENT_TYPE_INVAL:
/* 0 => this callback did not come from malloc */
OPAL_OUTPUT((-1, "ummunot: invalidate start %p, end %p",
(void*) events[i].hint_start,
(void*) events[i].hint_end));
opal_mem_hooks_release_hook((void *) (uintptr_t) events[i].hint_start,
events[i].hint_end - events[i].hint_start,
0);
break;
case UMMUNOTIFY_EVENT_TYPE_LAST:
opal_memory_linux_ummunotify_counter_last_value =
events[i].user_cookie_counter;
/* Are there more events to read? */
if (opal_memory_linux_ummunotify_counter_last_value ==
*opal_memory_linux_ummunotify_counter) {
OPAL_OUTPUT((-1, "ummunot: LAST; done"));
return OPAL_SUCCESS;
}
OPAL_OUTPUT((-1, "ummunot: LAST; but looping around"));
break;
}
}
}
/* Will only get here if this component has not been
initialized */
return OPAL_SUCCESS;
}
static int ummunotify_register(void *start, size_t len, uint64_t cookie)
{
struct ummunotify_register_ioctl r;
r.reserved = 0;
r.start = (unsigned long) start;
r.end = (unsigned long) start + len;
r.user_cookie = cookie;
OPAL_OUTPUT((-1, "ummunot: register %p - %p",
start, ((char*) start) + len));
if (initialized && ioctl(mca_memory_linux_component.ummunotify_fd,
UMMUNOTIFY_REGISTER_REGION, &r)) {
OPAL_OUTPUT((-1, "Error in ioctl register!"));
return OPAL_ERR_IN_ERRNO;
}
return OPAL_SUCCESS;
}
static int ummunotify_deregister(void *start, size_t len, uint64_t cookie)
{
OPAL_OUTPUT((-1, "ummunot: deregister %p - %p",
start, ((char*) start) + len));
if (initialized && ioctl(mca_memory_linux_component.ummunotify_fd,
UMMUNOTIFY_UNREGISTER_REGION, &cookie)) {
OPAL_OUTPUT((-1, "Error in ioctl unregister!"));
return OPAL_ERR_IN_ERRNO;
}
return OPAL_SUCCESS;
}
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