drivers/staging/android/sw_sync.c

   1 /*
   2  * drivers/base/sw_sync.c
   3  *
   4  * Copyright (C) 2012 Google, Inc.
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/export.h>
  20 #include <linux/file.h>
  21 #include <linux/fs.h>
  22 #include <linux/miscdevice.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/uaccess.h>
  25
  26 #include "sw_sync.h"
  27
  28 struct fence *sw_sync_pt_create(struct sw_sync_timeline *obj, u32 value)
  29 {
  30         struct sw_sync_pt *pt;
  31
  32         pt = (struct sw_sync_pt *)
  33                 sync_pt_create(&obj->obj, sizeof(struct sw_sync_pt));
  34
  35         pt->value = value;
  36
  37         return (struct fence *)pt;
  38 }
  39 EXPORT_SYMBOL(sw_sync_pt_create);
  40
  41 static int sw_sync_fence_has_signaled(struct fence *fence)
  42 {
  43         struct sw_sync_pt *pt = (struct sw_sync_pt *)fence;
  44         struct sw_sync_timeline *obj =
  45                 (struct sw_sync_timeline *)fence_parent(fence);
  46
  47         return (pt->value > obj->value) ? 0 : 1;
  48 }
  49
  50 static void sw_sync_timeline_value_str(struct sync_timeline *sync_timeline,
  51                                        char *str, int size)
  52 {
  53         struct sw_sync_timeline *timeline =
  54                 (struct sw_sync_timeline *)sync_timeline;
  55         snprintf(str, size, "%d", timeline->value);
  56 }
  57
  58 static void sw_sync_fence_value_str(struct fence *fence, char *str, int size)
  59 {
  60         struct sw_sync_pt *pt = (struct sw_sync_pt *)fence;
  61
  62         snprintf(str, size, "%d", pt->value);
  63 }
  64
  65 static struct sync_timeline_ops sw_sync_timeline_ops = {
  66         .driver_name = "sw_sync",
  67         .has_signaled = sw_sync_fence_has_signaled,
  68         .timeline_value_str = sw_sync_timeline_value_str,
  69         .fence_value_str = sw_sync_fence_value_str,
  70 };
  71
  72 struct sw_sync_timeline *sw_sync_timeline_create(const char *name)
  73 {
  74         struct sw_sync_timeline *obj = (struct sw_sync_timeline *)
  75                 sync_timeline_create(&sw_sync_timeline_ops,
  76                                      sizeof(struct sw_sync_timeline),
  77                                      name);
  78
  79         return obj;
  80 }
  81 EXPORT_SYMBOL(sw_sync_timeline_create);
  82
  83 void sw_sync_timeline_inc(struct sw_sync_timeline *obj, u32 inc)
  84 {
  85         obj->value += inc;
  86
  87         sync_timeline_signal(&obj->obj);
  88 }
  89 EXPORT_SYMBOL(sw_sync_timeline_inc);