drivers/gpu/drm/i915/i915_gem.h

   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 #include "i915_utils.h"
  34
  35 struct drm_i915_private;
  36
  37 #ifdef CONFIG_DRM_I915_DEBUG_GEM
  38
  39 #define GEM_SHOW_DEBUG() drm_debug_enabled(DRM_UT_DRIVER)
  40
  41 #define GEM_BUG_ON(condition) do { if (unlikely((condition))) { \
  42                 GEM_TRACE_ERR("%s:%d GEM_BUG_ON(%s)\n", \
  43                               __func__, __LINE__, __stringify(condition)); \
  44                 GEM_TRACE_DUMP(); \
  45                 BUG(); \
  46                 } \
  47         } while(0)
  48 #define GEM_WARN_ON(expr) WARN_ON(expr)
  49
  50 #define GEM_DEBUG_DECL(var) var
  51 #define GEM_DEBUG_EXEC(expr) expr
  52 #define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
  53 #define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
  54
  55 #else
  56
  57 #define GEM_SHOW_DEBUG() (0)
  58
  59 #define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
  60 #define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
  61
  62 #define GEM_DEBUG_DECL(var)
  63 #define GEM_DEBUG_EXEC(expr) do { } while (0)
  64 #define GEM_DEBUG_BUG_ON(expr)
  65 #define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
  66 #endif
  67
  68 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
  69 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
  70 #define GEM_TRACE_ERR(...) do {                                         \
  71         pr_err(__VA_ARGS__);                                            \
  72         trace_printk(__VA_ARGS__);                                      \
  73 } while (0)
  74 #define GEM_TRACE_DUMP() \
  75         do { ftrace_dump(DUMP_ALL); __add_taint_for_CI(TAINT_WARN); } while (0)
  76 #define GEM_TRACE_DUMP_ON(expr) \
  77         do { if (expr) GEM_TRACE_DUMP(); } while (0)
  78 #else
  79 #define GEM_TRACE(...) do { } while (0)
  80 #define GEM_TRACE_ERR(...) do { } while (0)
  81 #define GEM_TRACE_DUMP() do { } while (0)
  82 #define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
  83 #endif
  84
  85 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
  86
  87 static inline void tasklet_lock(struct tasklet_struct *t)
  88 {
  89         while (!tasklet_trylock(t))
  90                 cpu_relax();
  91 }
  92
  93 static inline bool tasklet_is_locked(const struct tasklet_struct *t)
  94 {
  95         return test_bit(TASKLET_STATE_RUN, &t->state);
  96 }
  97
  98 static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
  99 {
 100         if (!atomic_fetch_inc(&t->count))
 101                 tasklet_unlock_wait(t);
 102 }
 103
 104 static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
 105 {
 106         return !atomic_read(&t->count);
 107 }
 108
 109 static inline bool __tasklet_enable(struct tasklet_struct *t)
 110 {
 111         return atomic_dec_and_test(&t->count);
 112 }
 113
 114 static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
 115 {
 116         return test_bit(TASKLET_STATE_SCHED, &t->state);
 117 }
 118
 119 struct i915_gem_ww_ctx {
 120         struct ww_acquire_ctx ctx;
 121         struct list_head obj_list;
 122         bool intr;
 123         struct drm_i915_gem_object *contended;
 124 };
 125
 126 void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
 127 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
 128 int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
 129 void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
 130
 131 #endif /* __I915_GEM_H__ */