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
 33struct 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
 80static inline void tasklet_lock(struct tasklet_struct *t)
 81{
 82	while (!tasklet_trylock(t))
 83		cpu_relax();
 84}
 85
 86static 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
 92static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
 93{
 94	return !atomic_read(&t->count);
 95}
 96
 97static inline bool __tasklet_enable(struct tasklet_struct *t)
 98{
 99	return atomic_dec_and_test(&t->count);
100}
101
102static 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__ */