root/drivers/gpu/drm/i915/i915_gem.h

INCLUDED FROM

DEFINITIONS

1. tasklet_lock
2. __tasklet_disable_sync_once
3. __tasklet_is_enabled
4. __tasklet_enable
5. __tasklet_is_scheduled

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24 
  25 #ifndef __I915_GEM_H__
  26 #define __I915_GEM_H__
  27 
  28 #include <linux/bug.h>
  29 #include <linux/interrupt.h>
  30 
  31 #include <drm/drm_drv.h>
  32 
  33 struct drm_i915_private;
  34 
  35 #ifdef CONFIG_DRM_I915_DEBUG_GEM
  36 
  37 #define GEM_SHOW_DEBUG() (drm_debug & DRM_UT_DRIVER)
  38 
  39 #define GEM_BUG_ON(condition) do { if (unlikely((condition))) { \
  40                 pr_err("%s:%d GEM_BUG_ON(%s)\n", \
  41                        __func__, __LINE__, __stringify(condition)); \
  42                 GEM_TRACE("%s:%d GEM_BUG_ON(%s)\n", \
  43                           __func__, __LINE__, __stringify(condition)); \
  44                 BUG(); \
  45                 } \
  46         } while(0)
  47 #define GEM_WARN_ON(expr) WARN_ON(expr)
  48 
  49 #define GEM_DEBUG_DECL(var) var
  50 #define GEM_DEBUG_EXEC(expr) expr
  51 #define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
  52 #define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
  53 
  54 #else
  55 
  56 #define GEM_SHOW_DEBUG() (0)
  57 
  58 #define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
  59 #define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
  60 
  61 #define GEM_DEBUG_DECL(var)
  62 #define GEM_DEBUG_EXEC(expr) do { } while (0)
  63 #define GEM_DEBUG_BUG_ON(expr)
  64 #define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
  65 #endif
  66 
  67 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
  68 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
  69 #define GEM_TRACE_DUMP() ftrace_dump(DUMP_ALL)
  70 #define GEM_TRACE_DUMP_ON(expr) \
  71         do { if (expr) ftrace_dump(DUMP_ALL); } while (0)
  72 #else
  73 #define GEM_TRACE(...) do { } while (0)
  74 #define GEM_TRACE_DUMP() do { } while (0)
  75 #define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
  76 #endif
  77 
  78 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
  79 
  80 static inline void tasklet_lock(struct tasklet_struct *t)
  81 {
  82         while (!tasklet_trylock(t))
  83                 cpu_relax();
  84 }
  85 
  86 static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
  87 {
  88         if (!atomic_fetch_inc(&t->count))
  89                 tasklet_unlock_wait(t);
  90 }
  91 
  92 static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
  93 {
  94         return !atomic_read(&t->count);
  95 }
  96 
  97 static inline bool __tasklet_enable(struct tasklet_struct *t)
  98 {
  99         return atomic_dec_and_test(&t->count);
 100 }
 101 
 102 static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
 103 {
 104         return test_bit(TASKLET_STATE_SCHED, &t->state);
 105 }
 106 
 107 #endif /* __I915_GEM_H__ */