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path: root/src/gallium/winsys/svga/drm/vmw_screen.c
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/**********************************************************
 * Copyright 2009-2015 VMware, Inc.  All rights reserved.
 *
 * 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 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 "vmw_screen.h"
#include "vmw_fence.h"
#include "vmw_context.h"

#include "util/u_memory.h"
#include "pipe/p_compiler.h"
#include "util/u_hash_table.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

static struct util_hash_table *dev_hash = NULL;

static int vmw_dev_compare(void *key1, void *key2)
{
   return (major(*(dev_t *)key1) == major(*(dev_t *)key2) &&
           minor(*(dev_t *)key1) == minor(*(dev_t *)key2)) ? 0 : 1;
}

static unsigned vmw_dev_hash(void *key)
{
   return (major(*(dev_t *) key) << 16) | minor(*(dev_t *) key);
}

/* Called from vmw_drm_create_screen(), creates and initializes the
 * vmw_winsys_screen structure, which is the main entity in this
 * module.
 * First, check whether a vmw_winsys_screen object already exists for
 * this device, and in that case return that one, making sure that we
 * have our own file descriptor open to DRM.
 */

struct vmw_winsys_screen *
vmw_winsys_create( int fd )
{
   struct vmw_winsys_screen *vws;
   struct stat stat_buf;

   if (dev_hash == NULL) {
      dev_hash = util_hash_table_create(vmw_dev_hash, vmw_dev_compare);
      if (dev_hash == NULL)
         return NULL;
   }

   if (fstat(fd, &stat_buf))
      return NULL;

   vws = util_hash_table_get(dev_hash, &stat_buf.st_rdev);
   if (vws) {
      vws->open_count++;
      return vws;
   }

   vws = CALLOC_STRUCT(vmw_winsys_screen);
   if (!vws)
      goto out_no_vws;

   vws->device = stat_buf.st_rdev;
   vws->open_count = 1;
   vws->ioctl.drm_fd = dup(fd);
   vws->base.have_gb_dma = TRUE;
   vws->base.need_to_rebind_resources = FALSE;

   if (!vmw_ioctl_init(vws))
      goto out_no_ioctl;

   vws->fence_ops = vmw_fence_ops_create(vws);
   if (!vws->fence_ops)
      goto out_no_fence_ops;

   if(!vmw_pools_init(vws))
      goto out_no_pools;

   if (!vmw_winsys_screen_init_svga(vws))
      goto out_no_svga;

   if (util_hash_table_set(dev_hash, &vws->device, vws) != PIPE_OK)
      goto out_no_hash_insert;

   return vws;
out_no_hash_insert:
out_no_svga:
   vmw_pools_cleanup(vws);
out_no_pools:
   vws->fence_ops->destroy(vws->fence_ops);
out_no_fence_ops:
   vmw_ioctl_cleanup(vws);
out_no_ioctl:
   close(vws->ioctl.drm_fd);
   FREE(vws);
out_no_vws:
   return NULL;
}

void
vmw_winsys_destroy(struct vmw_winsys_screen *vws)
{
   if (--vws->open_count == 0) {
      util_hash_table_remove(dev_hash, &vws->device);
      vmw_pools_cleanup(vws);
      vws->fence_ops->destroy(vws->fence_ops);
      vmw_ioctl_cleanup(vws);
      close(vws->ioctl.drm_fd);
      FREE(vws);
   }
}