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// SPDX-License-Identifier: MIT
/*
* Copyright © 2021 Intel Corporation
*/
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "igt.h"
#include "intel_allocator_msgchannel.h"
extern __thread pid_t child_tid;
/* ----- SYSVIPC MSGQUEUE ----- */
#define FTOK_IGT_ALLOCATOR_KEY "/tmp/igt.allocator.key"
#define FTOK_IGT_ALLOCATOR_PROJID 2020
#define MAXQLEN 4096
#define ALLOCATOR_REQUEST 1
struct msgqueue_data {
key_t key;
int queue;
};
struct msgqueue_buf {
long mtype;
union {
struct alloc_req request;
struct alloc_resp response;
} data;
};
static void msgqueue_init(struct msg_channel *channel)
{
struct msgqueue_data *msgdata;
struct msqid_ds qstat;
key_t key;
int fd, queue;
igt_debug("Init msgqueue\n");
/* Create ftok key only if not exists */
fd = open(FTOK_IGT_ALLOCATOR_KEY, O_CREAT | O_EXCL | O_WRONLY, 0600);
igt_assert(fd >= 0 || errno == EEXIST);
if (fd >= 0)
close(fd);
key = ftok(FTOK_IGT_ALLOCATOR_KEY, FTOK_IGT_ALLOCATOR_PROJID);
igt_assert(key != -1);
igt_debug("Queue key: %x\n", (int) key);
queue = msgget(key, 0);
if (queue != -1) {
igt_assert(msgctl(queue, IPC_STAT, &qstat) == 0);
igt_debug("old messages: %lu\n", qstat.msg_qnum);
igt_assert(msgctl(queue, IPC_RMID, NULL) == 0);
}
queue = msgget(key, IPC_CREAT);
igt_debug("msg queue: %d\n", queue);
igt_assert(msgctl(queue, IPC_STAT, &qstat) == 0);
igt_debug("msg size in bytes: %lu\n", qstat.msg_qbytes);
qstat.msg_qbytes = MAXQLEN * sizeof(struct msgqueue_buf);
igt_debug("resizing queue to support %d requests\n", MAXQLEN);
igt_assert_f(msgctl(queue, IPC_SET, &qstat) == 0,
"Couldn't change queue size to %lu\n", qstat.msg_qbytes);
msgdata = calloc(1, sizeof(*msgdata));
igt_assert(msgdata);
msgdata->key = key;
msgdata->queue = queue;
channel->priv = msgdata;
channel->ready = true;
}
static void msgqueue_deinit(struct msg_channel *channel)
{
struct msgqueue_data *msgdata = channel->priv;
igt_debug("Deinit msgqueue\n");
msgctl(msgdata->queue, IPC_RMID, NULL);
free(channel->priv);
channel->ready = false;
}
static int msgqueue_send_req(struct msg_channel *channel,
struct alloc_req *request)
{
struct msgqueue_data *msgdata = channel->priv;
struct msgqueue_buf buf = {0};
int ret;
buf.mtype = ALLOCATOR_REQUEST;
buf.data.request.request_type = 1;
memcpy(&buf.data.request, request, sizeof(*request));
retry:
ret = msgsnd(msgdata->queue, &buf, sizeof(buf) - sizeof(long), 0);
if (ret == -1 && errno == EINTR)
goto retry;
if (ret == -1)
igt_warn("Error: %s\n", strerror(errno));
return ret;
}
static int msgqueue_recv_req(struct msg_channel *channel,
struct alloc_req *request)
{
struct msgqueue_data *msgdata = channel->priv;
struct msgqueue_buf buf = {0};
int ret, size = sizeof(buf) - sizeof(long);
retry:
ret = msgrcv(msgdata->queue, &buf, size, ALLOCATOR_REQUEST, 0);
if (ret == -1 && errno == EINTR)
goto retry;
if (ret == size)
memcpy(request, &buf.data.request, sizeof(*request));
else if (ret == -1)
igt_warn("Error: %s\n", strerror(errno));
return ret;
}
static int msgqueue_send_resp(struct msg_channel *channel,
struct alloc_resp *response)
{
struct msgqueue_data *msgdata = channel->priv;
struct msgqueue_buf buf = {0};
int ret;
buf.mtype = response->tid;
memcpy(&buf.data.response, response, sizeof(*response));
retry:
ret = msgsnd(msgdata->queue, &buf, sizeof(buf) - sizeof(long), 0);
if (ret == -1 && errno == EINTR)
goto retry;
if (ret == -1)
igt_warn("Error: %s\n", strerror(errno));
return ret;
}
static int msgqueue_recv_resp(struct msg_channel *channel,
struct alloc_resp *response)
{
struct msgqueue_data *msgdata = channel->priv;
struct msgqueue_buf buf = {0};
int ret, size = sizeof(buf) - sizeof(long);
retry:
ret = msgrcv(msgdata->queue, &buf, sizeof(buf) - sizeof(long),
response->tid, 0);
if (ret == -1 && errno == EINTR)
goto retry;
if (ret == size)
memcpy(response, &buf.data.response, sizeof(*response));
else if (ret == -1)
igt_warn("Error: %s\n", strerror(errno));
return ret;
}
static struct msg_channel msgqueue_channel = {
.priv = NULL,
.init = msgqueue_init,
.deinit = msgqueue_deinit,
.send_req = msgqueue_send_req,
.recv_req = msgqueue_recv_req,
.send_resp = msgqueue_send_resp,
.recv_resp = msgqueue_recv_resp,
};
struct msg_channel *intel_allocator_get_msgchannel(enum msg_channel_type type)
{
struct msg_channel *channel = NULL;
switch (type) {
case CHANNEL_SYSVIPC_MSGQUEUE:
channel = &msgqueue_channel;
}
igt_assert(channel);
return channel;
}
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