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i915_gem.h revision 1.1.1.1 
      1 /*	$NetBSD: i915_gem.h,v 1.1.1.1 2021/12/18 20:15:25 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright  2016 Intel Corporation
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the next
     14  * paragraph) shall be included in all copies or substantial portions of the
     15  * Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     23  * IN THE SOFTWARE.
     24  *
     25  */
     26 
     27 #ifndef __I915_GEM_H__
     28 #define __I915_GEM_H__
     29 
     30 #include <linux/bug.h>
     31 #include <linux/interrupt.h>
     32 
     33 #include <drm/drm_drv.h>
     34 
     35 #include "i915_utils.h"
     36 
     37 struct drm_i915_private;
     38 
     39 #ifdef CONFIG_DRM_I915_DEBUG_GEM
     40 
     41 #define GEM_SHOW_DEBUG() drm_debug_enabled(DRM_UT_DRIVER)
     42 
     43 #define GEM_BUG_ON(condition) do { if (unlikely((condition))) {	\
     44 		GEM_TRACE_ERR("%s:%d GEM_BUG_ON(%s)\n", \
     45 			      __func__, __LINE__, __stringify(condition)); \
     46 		GEM_TRACE_DUMP(); \
     47 		BUG(); \
     48 		} \
     49 	} while(0)
     50 #define GEM_WARN_ON(expr) WARN_ON(expr)
     51 
     52 #define GEM_DEBUG_DECL(var) var
     53 #define GEM_DEBUG_EXEC(expr) expr
     54 #define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
     55 #define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
     56 
     57 #else
     58 
     59 #define GEM_SHOW_DEBUG() (0)
     60 
     61 #define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
     62 #define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
     63 
     64 #define GEM_DEBUG_DECL(var)
     65 #define GEM_DEBUG_EXEC(expr) do { } while (0)
     66 #define GEM_DEBUG_BUG_ON(expr)
     67 #define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
     68 #endif
     69 
     70 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
     71 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
     72 #define GEM_TRACE_ERR(...) do {						\
     73 	pr_err(__VA_ARGS__);						\
     74 	trace_printk(__VA_ARGS__);					\
     75 } while (0)
     76 #define GEM_TRACE_DUMP() \
     77 	do { ftrace_dump(DUMP_ALL); add_taint_for_CI(TAINT_WARN); } while (0)
     78 #define GEM_TRACE_DUMP_ON(expr) \
     79 	do { if (expr) GEM_TRACE_DUMP(); } while (0)
     80 #else
     81 #define GEM_TRACE(...) do { } while (0)
     82 #define GEM_TRACE_ERR(...) do { } while (0)
     83 #define GEM_TRACE_DUMP() do { } while (0)
     84 #define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
     85 #endif
     86 
     87 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
     88 
     89 static inline void tasklet_lock(struct tasklet_struct *t)
     90 {
     91 	while (!tasklet_trylock(t))
     92 		cpu_relax();
     93 }
     94 
     95 static inline bool tasklet_is_locked(const struct tasklet_struct *t)
     96 {
     97 	return test_bit(TASKLET_STATE_RUN, &t->state);
     98 }
     99 
    100 static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
    101 {
    102 	if (!atomic_fetch_inc(&t->count))
    103 		tasklet_unlock_wait(t);
    104 }
    105 
    106 static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
    107 {
    108 	return !atomic_read(&t->count);
    109 }
    110 
    111 static inline bool __tasklet_enable(struct tasklet_struct *t)
    112 {
    113 	return atomic_dec_and_test(&t->count);
    114 }
    115 
    116 static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
    117 {
    118 	return test_bit(TASKLET_STATE_SCHED, &t->state);
    119 }
    120 
    121 #endif /* __I915_GEM_H__ */
    122