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/*
* Copyright © 2017 Lima Project
*
* 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 <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "c11/threads.h"
#include "util/u_hash_table.h"
#include "util/u_pointer.h"
#include "renderonly/renderonly.h"
#include "lima_drm_public.h"
#include "lima/lima_screen.h"
static struct util_hash_table *fd_tab = NULL;
static mtx_t lima_screen_mutex = _MTX_INITIALIZER_NP;
static void
lima_drm_screen_destroy(struct pipe_screen *pscreen)
{
struct lima_screen *screen = lima_screen(pscreen);
boolean destroy;
int fd = screen->fd;
mtx_lock(&lima_screen_mutex);
destroy = --screen->refcnt == 0;
if (destroy)
util_hash_table_remove(fd_tab, intptr_to_pointer(fd));
mtx_unlock(&lima_screen_mutex);
if (destroy) {
pscreen->destroy = screen->winsys_priv;
pscreen->destroy(pscreen);
close(fd);
}
}
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 *
lima_drm_screen_create(int fd)
{
struct pipe_screen *pscreen = NULL;
mtx_lock(&lima_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) {
lima_screen(pscreen)->refcnt++;
} else {
int dup_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
pscreen = lima_screen_create(dup_fd, NULL);
if (pscreen) {
util_hash_table_set(fd_tab, intptr_to_pointer(dup_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():
*/
lima_screen(pscreen)->winsys_priv = pscreen->destroy;
pscreen->destroy = lima_drm_screen_destroy;
}
}
unlock:
mtx_unlock(&lima_screen_mutex);
return pscreen;
}
struct pipe_screen *
lima_drm_screen_create_renderonly(struct renderonly *ro)
{
return lima_screen_create(fcntl(ro->gpu_fd, F_DUPFD_CLOEXEC, 3), ro);
}
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