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/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
/*
* Copyright (C) 2012 Rob Clark <robclark@freedesktop.org>
*
* 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.
*
* Authors:
* Rob Clark <robclark@freedesktop.org>
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include "freedreno_drmif.h"
#include "freedreno_priv.h"
static pthread_mutex_t table_lock = PTHREAD_MUTEX_INITIALIZER;
static void * dev_table;
static struct fd_device * fd_device_new_impl(int fd)
{
struct fd_device *dev = calloc(1, sizeof(*dev));
if (!dev)
return NULL;
atomic_set(&dev->refcnt, 1);
dev->fd = fd;
dev->handle_table = drmHashCreate();
dev->name_table = drmHashCreate();
return dev;
}
/* use inode for key into dev_table, rather than fd, to avoid getting
* confused by multiple-opens:
*/
static int devkey(int fd)
{
struct stat s;
if (fstat(fd, &s)) {
ERROR_MSG("stat failed: %s", strerror(errno));
return -1;
}
return s.st_ino;
}
struct fd_device * fd_device_new(int fd)
{
struct fd_device *dev = NULL;
int key = devkey(fd);
pthread_mutex_lock(&table_lock);
if (!dev_table)
dev_table = drmHashCreate();
if (drmHashLookup(dev_table, key, (void **)&dev)) {
dev = fd_device_new_impl(fd);
drmHashInsert(dev_table, key, dev);
} else {
dev = fd_device_ref(dev);
}
pthread_mutex_unlock(&table_lock);
return dev;
}
struct fd_device * fd_device_ref(struct fd_device *dev)
{
atomic_inc(&dev->refcnt);
return dev;
}
void fd_device_del(struct fd_device *dev)
{
if (!atomic_dec_and_test(&dev->refcnt))
return;
pthread_mutex_lock(&table_lock);
drmHashDestroy(dev->handle_table);
drmHashDestroy(dev->name_table);
drmHashDelete(dev_table, devkey(dev->fd));
pthread_mutex_unlock(&table_lock);
free(dev);
}
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