1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright � 2008-2018 Intel Corporation 5 */ 6 7 #ifndef _I915_GPU_ERROR_H_ 8 #define _I915_GPU_ERROR_H_ 9 10 #include <linux/kref.h> 11 #include <linux/ktime.h> 12 #include <linux/sched.h> 13 14 #include <drm/drm_mm.h> 15 16 #include "intel_device_info.h" 17 #include "intel_ringbuffer.h" 18 #include "intel_uc_fw.h" 19 20 #include "i915_gem.h" 21 #include "i915_gem_gtt.h" 22 #include "i915_params.h" 23 #include "i915_scheduler.h" 24 25 struct drm_i915_private; 26 struct intel_overlay_error_state; 27 struct intel_display_error_state; 28 29 struct i915_gpu_state { 30 struct kref ref; 31 ktime_t time; 32 ktime_t boottime; 33 ktime_t uptime; 34 unsigned long capture; 35 unsigned long epoch; 36 37 struct drm_i915_private *i915; 38 39 char error_msg[128]; 40 bool simulated; 41 bool awake; 42 bool wakelock; 43 bool suspended; 44 int iommu; 45 u32 reset_count; 46 u32 suspend_count; 47 struct intel_device_info device_info; 48 struct intel_driver_caps driver_caps; 49 struct i915_params params; 50 51 struct i915_error_uc { 52 struct intel_uc_fw guc_fw; 53 struct intel_uc_fw huc_fw; 54 struct drm_i915_error_object *guc_log; 55 } uc; 56 57 /* Generic register state */ 58 u32 eir; 59 u32 pgtbl_er; 60 u32 ier; 61 u32 gtier[6], ngtier; 62 u32 ccid; 63 u32 derrmr; 64 u32 forcewake; 65 u32 error; /* gen6+ */ 66 u32 err_int; /* gen7 */ 67 u32 fault_data0; /* gen8, gen9 */ 68 u32 fault_data1; /* gen8, gen9 */ 69 u32 done_reg; 70 u32 gac_eco; 71 u32 gam_ecochk; 72 u32 gab_ctl; 73 u32 gfx_mode; 74 75 u32 nfence; 76 u64 fence[I915_MAX_NUM_FENCES]; 77 struct intel_overlay_error_state *overlay; 78 struct intel_display_error_state *display; 79 80 struct drm_i915_error_engine { 81 int engine_id; 82 /* Software tracked state */ 83 bool idle; 84 bool waiting; 85 int num_waiters; 86 unsigned long hangcheck_timestamp; 87 bool hangcheck_stalled; 88 enum intel_engine_hangcheck_action hangcheck_action; 89 struct i915_address_space *vm; 90 int num_requests; 91 u32 reset_count; 92 93 /* position of active request inside the ring */ 94 u32 rq_head, rq_post, rq_tail; 95 96 /* our own tracking of ring head and tail */ 97 u32 cpu_ring_head; 98 u32 cpu_ring_tail; 99 100 u32 last_seqno; 101 102 /* Register state */ 103 u32 start; 104 u32 tail; 105 u32 head; 106 u32 ctl; 107 u32 mode; 108 u32 hws; 109 u32 ipeir; 110 u32 ipehr; 111 u32 bbstate; 112 u32 instpm; 113 u32 instps; 114 u32 seqno; 115 u64 bbaddr; 116 u64 acthd; 117 u32 fault_reg; 118 u64 faddr; 119 u32 rc_psmi; /* sleep state */ 120 u32 semaphore_mboxes[I915_NUM_ENGINES - 1]; 121 struct intel_instdone instdone; 122 123 struct drm_i915_error_context { 124 char comm[TASK_COMM_LEN]; 125 pid_t pid; 126 u32 handle; 127 u32 hw_id; 128 int ban_score; 129 int active; 130 int guilty; 131 bool bannable; 132 struct i915_sched_attr sched_attr; 133 } context; 134 135 struct drm_i915_error_object { 136 u64 gtt_offset; 137 u64 gtt_size; 138 int page_count; 139 int unused; 140 u32 *pages[0]; 141 } *ringbuffer, *batchbuffer, *wa_batchbuffer, *ctx, *hws_page; 142 143 struct drm_i915_error_object **user_bo; 144 long user_bo_count; 145 146 struct drm_i915_error_object *wa_ctx; 147 struct drm_i915_error_object *default_state; 148 149 struct drm_i915_error_request { 150 long jiffies; 151 pid_t pid; 152 u32 context; 153 int ban_score; 154 u32 seqno; 155 u32 start; 156 u32 head; 157 u32 tail; 158 struct i915_sched_attr sched_attr; 159 } *requests, execlist[EXECLIST_MAX_PORTS]; 160 unsigned int num_ports; 161 162 struct drm_i915_error_waiter { 163 char comm[TASK_COMM_LEN]; 164 pid_t pid; 165 u32 seqno; 166 } *waiters; 167 168 struct { 169 u32 gfx_mode; 170 union { 171 u64 pdp[4]; 172 u32 pp_dir_base; 173 }; 174 } vm_info; 175 } engine[I915_NUM_ENGINES]; 176 177 struct drm_i915_error_buffer { 178 u32 size; 179 u32 name; 180 u32 wseqno; 181 u64 gtt_offset; 182 u32 read_domains; 183 u32 write_domain; 184 s32 fence_reg:I915_MAX_NUM_FENCE_BITS; 185 u32 tiling:2; 186 u32 dirty:1; 187 u32 purgeable:1; 188 u32 userptr:1; 189 s32 engine:4; 190 u32 cache_level:3; 191 } *active_bo[I915_NUM_ENGINES], *pinned_bo; 192 u32 active_bo_count[I915_NUM_ENGINES], pinned_bo_count; 193 struct i915_address_space *active_vm[I915_NUM_ENGINES]; 194 }; 195 196 struct i915_gpu_error { 197 /* For hangcheck timer */ 198 #define DRM_I915_HANGCHECK_PERIOD 1500 /* in ms */ 199 #define DRM_I915_HANGCHECK_JIFFIES msecs_to_jiffies(DRM_I915_HANGCHECK_PERIOD) 200 201 struct delayed_work hangcheck_work; 202 203 /* For reset and error_state handling. */ 204 spinlock_t lock; 205 /* Protected by the above dev->gpu_error.lock. */ 206 struct i915_gpu_state *first_error; 207 208 atomic_t pending_fb_pin; 209 210 unsigned long missed_irq_rings; 211 212 /** 213 * State variable controlling the reset flow and count 214 * 215 * This is a counter which gets incremented when reset is triggered, 216 * 217 * Before the reset commences, the I915_RESET_BACKOFF bit is set 218 * meaning that any waiters holding onto the struct_mutex should 219 * relinquish the lock immediately in order for the reset to start. 220 * 221 * If reset is not completed successfully, the I915_WEDGE bit is 222 * set meaning that hardware is terminally sour and there is no 223 * recovery. All waiters on the reset_queue will be woken when 224 * that happens. 225 * 226 * This counter is used by the wait_seqno code to notice that reset 227 * event happened and it needs to restart the entire ioctl (since most 228 * likely the seqno it waited for won't ever signal anytime soon). 229 * 230 * This is important for lock-free wait paths, where no contended lock 231 * naturally enforces the correct ordering between the bail-out of the 232 * waiter and the gpu reset work code. 233 */ 234 unsigned long reset_count; 235 236 /** 237 * flags: Control various stages of the GPU reset 238 * 239 * #I915_RESET_BACKOFF - When we start a reset, we want to stop any 240 * other users acquiring the struct_mutex. To do this we set the 241 * #I915_RESET_BACKOFF bit in the error flags when we detect a reset 242 * and then check for that bit before acquiring the struct_mutex (in 243 * i915_mutex_lock_interruptible()?). I915_RESET_BACKOFF serves a 244 * secondary role in preventing two concurrent global reset attempts. 245 * 246 * #I915_RESET_HANDOFF - To perform the actual GPU reset, we need the 247 * struct_mutex. We try to acquire the struct_mutex in the reset worker, 248 * but it may be held by some long running waiter (that we cannot 249 * interrupt without causing trouble). Once we are ready to do the GPU 250 * reset, we set the I915_RESET_HANDOFF bit and wakeup any waiters. If 251 * they already hold the struct_mutex and want to participate they can 252 * inspect the bit and do the reset directly, otherwise the worker 253 * waits for the struct_mutex. 254 * 255 * #I915_RESET_ENGINE[num_engines] - Since the driver doesn't need to 256 * acquire the struct_mutex to reset an engine, we need an explicit 257 * flag to prevent two concurrent reset attempts in the same engine. 258 * As the number of engines continues to grow, allocate the flags from 259 * the most significant bits. 260 * 261 * #I915_WEDGED - If reset fails and we can no longer use the GPU, 262 * we set the #I915_WEDGED bit. Prior to command submission, e.g. 263 * i915_request_alloc(), this bit is checked and the sequence 264 * aborted (with -EIO reported to userspace) if set. 265 */ 266 unsigned long flags; 267 #define I915_RESET_BACKOFF 0 268 #define I915_RESET_HANDOFF 1 269 #define I915_RESET_MODESET 2 270 #define I915_WEDGED (BITS_PER_LONG - 1) 271 #define I915_RESET_ENGINE (I915_WEDGED - I915_NUM_ENGINES) 272 273 /** Number of times an engine has been reset */ 274 u32 reset_engine_count[I915_NUM_ENGINES]; 275 276 /** Set of stalled engines with guilty requests, in the current reset */ 277 u32 stalled_mask; 278 279 /** Reason for the current *global* reset */ 280 const char *reason; 281 282 /** 283 * Waitqueue to signal when a hang is detected. Used to for waiters 284 * to release the struct_mutex for the reset to procede. 285 */ 286 wait_queue_head_t wait_queue; 287 288 /** 289 * Waitqueue to signal when the reset has completed. Used by clients 290 * that wait for dev_priv->mm.wedged to settle. 291 */ 292 wait_queue_head_t reset_queue; 293 294 /* For missed irq/seqno simulation. */ 295 unsigned long test_irq_rings; 296 }; 297 298 struct drm_i915_error_state_buf { 299 struct drm_i915_private *i915; 300 unsigned int bytes; 301 unsigned int size; 302 int err; 303 u8 *buf; 304 loff_t start; 305 loff_t pos; 306 }; 307 308 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 309 310 __printf(2, 3) 311 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...); 312 int i915_error_state_to_str(struct drm_i915_error_state_buf *estr, 313 const struct i915_gpu_state *gpu); 314 int i915_error_state_buf_init(struct drm_i915_error_state_buf *eb, 315 struct drm_i915_private *i915, 316 size_t count, loff_t pos); 317 318 static inline void 319 i915_error_state_buf_release(struct drm_i915_error_state_buf *eb) 320 { 321 kfree(eb->buf); 322 } 323 324 struct i915_gpu_state *i915_capture_gpu_state(struct drm_i915_private *i915); 325 void i915_capture_error_state(struct drm_i915_private *dev_priv, 326 u32 engine_mask, 327 const char *error_msg); 328 329 static inline struct i915_gpu_state * 330 i915_gpu_state_get(struct i915_gpu_state *gpu) 331 { 332 kref_get(&gpu->ref); 333 return gpu; 334 } 335 336 void __i915_gpu_state_free(struct kref *kref); 337 static inline void i915_gpu_state_put(struct i915_gpu_state *gpu) 338 { 339 if (gpu) 340 kref_put(&gpu->ref, __i915_gpu_state_free); 341 } 342 343 struct i915_gpu_state *i915_first_error_state(struct drm_i915_private *i915); 344 void i915_reset_error_state(struct drm_i915_private *i915); 345 346 #else 347 348 static inline void i915_capture_error_state(struct drm_i915_private *dev_priv, 349 u32 engine_mask, 350 const char *error_msg) 351 { 352 } 353 354 static inline struct i915_gpu_state * 355 i915_first_error_state(struct drm_i915_private *i915) 356 { 357 return NULL; 358 } 359 360 static inline void i915_reset_error_state(struct drm_i915_private *i915) 361 { 362 } 363 364 #endif /* IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) */ 365 366 #endif /* _I915_GPU_ERROR_H_ */ 367