src/util/magma/u_magma.c

/*
 * Copyright © 2022 Google, LLC
 *
 * 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 "u_magma.h"

#include "u_magma_map.h"

#include <assert.h>
#include <pthread.h>

#if defined(__linux__)
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#endif

#if defined(__Fuchsia__)
#include "os/fuchsia.h"
#endif

static struct u_magma_map s_device_map;
static pthread_once_t s_once;

static void s_map_release(void)
{
   u_magma_map_release(&s_device_map);
}

static void s_map_init(void)
{
   u_magma_map_init(&s_device_map);
   atexit(s_map_release);
}

int u_magma_open(const char* path)
{
   pthread_once(&s_once, s_map_init);

   magma_device_t device;
#if defined(__Fuchsia__)
   {
      zx_handle_t client_handle;
      if (!fuchsia_open(path, &client_handle)) {
         return -1;
      }

      if (magma_device_import(client_handle, &device) != MAGMA_STATUS_OK) {
         return -1;
      }
   }
#else
   {
      int fd = open(path, O_RDWR | O_CLOEXEC);
      if (fd < 0)
         return -1;

      if (magma_device_import(fd, &device) != MAGMA_STATUS_OK) {
         return -1;
      }
   }
#endif

   return u_magma_map_get(&s_device_map, device);
}

void u_magma_close(int fd) {
   assert(fd >= 0);

   uint64_t object;
   if (!u_magma_map_query(&s_device_map, fd, &object))
      return;

   magma_device_release((magma_device_t)object);

   u_magma_map_put(&s_device_map, fd);
}

magma_device_t u_magma_device_from_fd(int fd) {
   assert(fd >= 0);

   uint64_t object;
   if (!u_magma_map_query(&s_device_map, fd, &object))
      return 0;

   return (magma_device_t) object;
}