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
 35struct 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
 87static inline void tasklet_lock(struct tasklet_struct *t)
 88{
 89	while (!tasklet_trylock(t))
 90		cpu_relax();
 91}
 92
 93static inline bool tasklet_is_locked(const struct tasklet_struct *t)
 94{
 95	return test_bit(TASKLET_STATE_RUN, &t->state);
 96}
 97
 98static 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
104static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
105{
106	return !atomic_read(&t->count);
107}
108
109static inline bool __tasklet_enable(struct tasklet_struct *t)
110{
111	return atomic_dec_and_test(&t->count);
112}
113
114static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
115{
116	return test_bit(TASKLET_STATE_SCHED, &t->state);
117}
118
119#endif /* __I915_GEM_H__ */