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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/stat.h>
#include "pipe/p_context.h"
#include "pipe/p_state.h"
#include "util/u_format.h"
#include "util/u_memory.h"
#include "util/u_inlines.h"
#include "util/u_hash_table.h"
#include "os/os_thread.h"
#include "freedreno_drm_public.h"
#include "freedreno/freedreno_screen.h"
static struct util_hash_table *fd_tab = NULL;
static mtx_t fd_screen_mutex = _MTX_INITIALIZER_NP;
static void
fd_drm_screen_destroy(struct pipe_screen *pscreen)
{
struct fd_screen *screen = fd_screen(pscreen);
boolean destroy;
mtx_lock(&fd_screen_mutex);
destroy = --screen->refcnt == 0;
if (destroy) {
int fd = fd_device_fd(screen->dev);
util_hash_table_remove(fd_tab, intptr_to_pointer(fd));
}
mtx_unlock(&fd_screen_mutex);
if (destroy) {
pscreen->destroy = screen->winsys_priv;
pscreen->destroy(pscreen);
}
}
static unsigned hash_fd(void *key)
{
int fd = pointer_to_intptr(key);
struct stat stat;
fstat(fd, &stat);
return stat.st_dev ^ stat.st_ino ^ stat.st_rdev;
}
static int compare_fd(void *key1, void *key2)
{
int fd1 = pointer_to_intptr(key1);
int fd2 = pointer_to_intptr(key2);
struct stat stat1, stat2;
fstat(fd1, &stat1);
fstat(fd2, &stat2);
return stat1.st_dev != stat2.st_dev ||
stat1.st_ino != stat2.st_ino ||
stat1.st_rdev != stat2.st_rdev;
}
struct pipe_screen *
fd_drm_screen_create(int fd)
{
struct pipe_screen *pscreen = NULL;
mtx_lock(&fd_screen_mutex);
if (!fd_tab) {
fd_tab = util_hash_table_create(hash_fd, compare_fd);
if (!fd_tab)
goto unlock;
}
pscreen = util_hash_table_get(fd_tab, intptr_to_pointer(fd));
if (pscreen) {
fd_screen(pscreen)->refcnt++;
} else {
struct fd_device *dev = fd_device_new_dup(fd);
if (!dev)
goto unlock;
pscreen = fd_screen_create(dev);
if (pscreen) {
int fd = fd_device_fd(dev);
util_hash_table_set(fd_tab, intptr_to_pointer(fd), pscreen);
/* Bit of a hack, to avoid circular linkage dependency,
* ie. pipe driver having to call in to winsys, we
* override the pipe drivers screen->destroy():
*/
fd_screen(pscreen)->winsys_priv = pscreen->destroy;
pscreen->destroy = fd_drm_screen_destroy;
}
}
unlock:
mtx_unlock(&fd_screen_mutex);
return pscreen;
}
|
