LXR linux/drivers/gpu/drm/i915/i915

   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
 119struct 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
 126void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
 127void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
 128int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
 129void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
 130
 131#endif /* __I915_GEM_H__ */
 132