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/*
* Copyright © 2022 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "drmtest.h"
#include "igt_drm_fdinfo.h"
static size_t read_fdinfo(char *buf, const size_t sz, int at, const char *name)
{
size_t count;
int fd;
fd = openat(at, name, O_RDONLY);
if (fd < 0)
return 0;
count = read(fd, buf, sz - 1);
if (count > 0)
buf[count - 1] = 0;
close(fd);
return count > 0 ? count : 0;
}
static int parse_engine(char *line, struct drm_client_fdinfo *info,
size_t prefix_len, uint64_t *val)
{
static const char *e2class[] = {
"render",
"copy",
"video",
"video-enhance",
};
ssize_t name_len;
char *name, *p;
int found = -1;
unsigned int i;
p = index(line, ':');
if (!p || p == line)
return -1;
name_len = p - line - prefix_len;
if (name_len < 1)
return -1;
name = line + prefix_len;
for (i = 0; i < ARRAY_SIZE(e2class); i++) {
if (!strncmp(name, e2class[i], name_len)) {
found = i;
break;
}
}
if (found >= 0) {
while (*++p && isspace(*p));
*val = strtoull(p, NULL, 10);
}
return found;
}
static const char *find_kv(const char *buf, const char *key, size_t keylen)
{
const char *p = buf;
if (strncmp(buf, key, keylen))
return NULL;
p = index(buf, ':');
if (!p || p == buf)
return NULL;
if ((p - buf) != keylen)
return NULL;
p++;
while (*p && isspace(*p))
p++;
return *p ? p : NULL;
}
unsigned int
__igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info)
{
char buf[4096], *_buf = buf;
char *l, *ctx = NULL;
unsigned int good = 0, num_capacity = 0;
size_t count;
count = read_fdinfo(buf, sizeof(buf), dir, fd);
if (!count)
return 0;
while ((l = strtok_r(_buf, "\n", &ctx))) {
uint64_t val = 0;
const char *v;
int idx;
_buf = NULL;
if ((v = find_kv(l, "drm-driver", strlen("drm-driver")))) {
strncpy(info->driver, v, sizeof(info->driver) - 1);
good++;
} else if ((v = find_kv(l, "drm-pdev", strlen("drm-pdev")))) {
strncpy(info->pdev, v, sizeof(info->pdev) - 1);
} else if ((v = find_kv(l, "drm-client-id",
strlen("drm-client-id")))) {
info->id = atol(v);
good++;
} else if (!strncmp(l, "drm-engine-", 11) &&
strncmp(l, "drm-engine-capacity-", 20)) {
idx = parse_engine(l, info, strlen("drm-engine-"),
&val);
if (idx >= 0) {
if (!info->capacity[idx])
info->capacity[idx] = 1;
info->busy[idx] = val;
info->num_engines++;
}
} else if (!strncmp(l, "drm-engine-capacity-", 20)) {
idx = parse_engine(l, info,
strlen("drm-engine-capacity-"),
&val);
if (idx >= 0) {
info->capacity[idx] = val;
num_capacity++;
}
}
}
if (good < 2 || !info->num_engines)
return 0; /* fdinfo format not as expected */
return good + info->num_engines + num_capacity;
}
unsigned int igt_parse_drm_fdinfo(int drm_fd, struct drm_client_fdinfo *info)
{
unsigned int res;
char fd[64];
int dir, ret;
ret = snprintf(fd, sizeof(fd), "%u", drm_fd);
if (ret < 0 || ret == sizeof(fd))
return false;
dir = open("/proc/self/fdinfo", O_DIRECTORY | O_RDONLY);
if (dir < 0)
return false;
res = __igt_parse_drm_fdinfo(dir, fd, info);
close(dir);
return res;
}
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