1 /* SPDX-License-Identifier: MIT */
2 #ifndef _INTEL_RINGBUFFER_H_
3 #define _INTEL_RINGBUFFER_H_
4 
5 #include <asm/cacheflush.h>
6 #include <drm/drm_util.h>
7 
8 #include <linux/hashtable.h>
9 #include <linux/irq_work.h>
10 #include <linux/random.h>
11 #include <linux/seqlock.h>
12 
13 #include "i915_pmu.h"
14 #include "i915_reg.h"
15 #include "i915_request.h"
16 #include "i915_selftest.h"
17 #include "intel_engine_types.h"
18 #include "intel_gt_types.h"
19 #include "intel_timeline.h"
20 #include "intel_workarounds.h"
21 
22 struct drm_printer;
23 struct intel_context;
24 struct intel_gt;
25 struct lock_class_key;
26 
27 /* Early gen2 devices have a cacheline of just 32 bytes, using 64 is overkill,
28  * but keeps the logic simple. Indeed, the whole purpose of this macro is just
29  * to give some inclination as to some of the magic values used in the various
30  * workarounds!
31  */
32 #define CACHELINE_BYTES 64
33 #define CACHELINE_DWORDS (CACHELINE_BYTES / sizeof(u32))
34 
35 #define ENGINE_TRACE(e, fmt, ...) do {					\
36 	const struct intel_engine_cs *e__ __maybe_unused = (e);		\
37 	GEM_TRACE("%s %s: " fmt,					\
38 		  dev_name(e__->i915->drm.dev), e__->name,		\
39 		  ##__VA_ARGS__);					\
40 } while (0)
41 
42 /*
43  * The register defines to be used with the following macros need to accept a
44  * base param, e.g:
45  *
46  * REG_FOO(base) _MMIO((base) + <relative offset>)
47  * ENGINE_READ(engine, REG_FOO);
48  *
49  * register arrays are to be defined and accessed as follows:
50  *
51  * REG_BAR(base, i) _MMIO((base) + <relative offset> + (i) * <shift>)
52  * ENGINE_READ_IDX(engine, REG_BAR, i)
53  */
54 
55 #define __ENGINE_REG_OP(op__, engine__, ...) \
56 	intel_uncore_##op__((engine__)->uncore, __VA_ARGS__)
57 
58 #define __ENGINE_READ_OP(op__, engine__, reg__) \
59 	__ENGINE_REG_OP(op__, (engine__), reg__((engine__)->mmio_base))
60 
61 #define ENGINE_READ16(...)	__ENGINE_READ_OP(read16, __VA_ARGS__)
62 #define ENGINE_READ(...)	__ENGINE_READ_OP(read, __VA_ARGS__)
63 #define ENGINE_READ_FW(...)	__ENGINE_READ_OP(read_fw, __VA_ARGS__)
64 #define ENGINE_POSTING_READ(...) __ENGINE_READ_OP(posting_read_fw, __VA_ARGS__)
65 #define ENGINE_POSTING_READ16(...) __ENGINE_READ_OP(posting_read16, __VA_ARGS__)
66 
67 #define ENGINE_READ64(engine__, lower_reg__, upper_reg__) \
68 	__ENGINE_REG_OP(read64_2x32, (engine__), \
69 			lower_reg__((engine__)->mmio_base), \
70 			upper_reg__((engine__)->mmio_base))
71 
72 #define ENGINE_READ_IDX(engine__, reg__, idx__) \
73 	__ENGINE_REG_OP(read, (engine__), reg__((engine__)->mmio_base, (idx__)))
74 
75 #define __ENGINE_WRITE_OP(op__, engine__, reg__, val__) \
76 	__ENGINE_REG_OP(op__, (engine__), reg__((engine__)->mmio_base), (val__))
77 
78 #define ENGINE_WRITE16(...)	__ENGINE_WRITE_OP(write16, __VA_ARGS__)
79 #define ENGINE_WRITE(...)	__ENGINE_WRITE_OP(write, __VA_ARGS__)
80 #define ENGINE_WRITE_FW(...)	__ENGINE_WRITE_OP(write_fw, __VA_ARGS__)
81 
82 #define GEN6_RING_FAULT_REG_READ(engine__) \
83 	intel_uncore_read((engine__)->uncore, RING_FAULT_REG(engine__))
84 
85 #define GEN6_RING_FAULT_REG_POSTING_READ(engine__) \
86 	intel_uncore_posting_read((engine__)->uncore, RING_FAULT_REG(engine__))
87 
88 #define GEN6_RING_FAULT_REG_RMW(engine__, clear__, set__) \
89 ({ \
90 	u32 __val; \
91 \
92 	__val = intel_uncore_read((engine__)->uncore, \
93 				  RING_FAULT_REG(engine__)); \
94 	__val &= ~(clear__); \
95 	__val |= (set__); \
96 	intel_uncore_write((engine__)->uncore, RING_FAULT_REG(engine__), \
97 			   __val); \
98 })
99 
100 /* seqno size is actually only a uint32, but since we plan to use MI_FLUSH_DW to
101  * do the writes, and that must have qw aligned offsets, simply pretend it's 8b.
102  */
103 
104 static inline unsigned int
105 execlists_num_ports(const struct intel_engine_execlists * const execlists)
106 {
107 	return execlists->port_mask + 1;
108 }
109 
110 static inline struct i915_request *
111 execlists_active(const struct intel_engine_execlists *execlists)
112 {
113 	struct i915_request * const *cur, * const *old, *active;
114 
115 	cur = READ_ONCE(execlists->active);
116 	smp_rmb(); /* pairs with overwrite protection in process_csb() */
117 	do {
118 		old = cur;
119 
120 		active = READ_ONCE(*cur);
121 		cur = READ_ONCE(execlists->active);
122 
123 		smp_rmb(); /* and complete the seqlock retry */
124 	} while (unlikely(cur != old));
125 
126 	return active;
127 }
128 
129 struct i915_request *
130 execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists);
131 
132 static inline u32
133 intel_read_status_page(const struct intel_engine_cs *engine, int reg)
134 {
135 	/* Ensure that the compiler doesn't optimize away the load. */
136 	return READ_ONCE(engine->status_page.addr[reg]);
137 }
138 
139 static inline void
140 intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
141 {
142 	/* Writing into the status page should be done sparingly. Since
143 	 * we do when we are uncertain of the device state, we take a bit
144 	 * of extra paranoia to try and ensure that the HWS takes the value
145 	 * we give and that it doesn't end up trapped inside the CPU!
146 	 */
147 	if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
148 		mb();
149 		clflush(&engine->status_page.addr[reg]);
150 		engine->status_page.addr[reg] = value;
151 		clflush(&engine->status_page.addr[reg]);
152 		mb();
153 	} else {
154 		WRITE_ONCE(engine->status_page.addr[reg], value);
155 	}
156 }
157 
158 /*
159  * Reads a dword out of the status page, which is written to from the command
160  * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or
161  * MI_STORE_DATA_IMM.
162  *
163  * The following dwords have a reserved meaning:
164  * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
165  * 0x04: ring 0 head pointer
166  * 0x05: ring 1 head pointer (915-class)
167  * 0x06: ring 2 head pointer (915-class)
168  * 0x10-0x1b: Context status DWords (GM45)
169  * 0x1f: Last written status offset. (GM45)
170  * 0x20-0x2f: Reserved (Gen6+)
171  *
172  * The area from dword 0x30 to 0x3ff is available for driver usage.
173  */
174 #define I915_GEM_HWS_PREEMPT		0x32
175 #define I915_GEM_HWS_PREEMPT_ADDR	(I915_GEM_HWS_PREEMPT * sizeof(u32))
176 #define I915_GEM_HWS_SEQNO		0x40
177 #define I915_GEM_HWS_SEQNO_ADDR		(I915_GEM_HWS_SEQNO * sizeof(u32))
178 #define I915_GEM_HWS_MIGRATE		(0x42 * sizeof(u32))
179 #define I915_GEM_HWS_PXP		0x60
180 #define I915_GEM_HWS_PXP_ADDR		(I915_GEM_HWS_PXP * sizeof(u32))
181 #define I915_GEM_HWS_SCRATCH		0x80
182 
183 #define I915_HWS_CSB_BUF0_INDEX		0x10
184 #define I915_HWS_CSB_WRITE_INDEX	0x1f
185 #define ICL_HWS_CSB_WRITE_INDEX		0x2f
186 
187 void intel_engine_stop(struct intel_engine_cs *engine);
188 void intel_engine_cleanup(struct intel_engine_cs *engine);
189 
190 int intel_engines_init_mmio(struct intel_gt *gt);
191 int intel_engines_init(struct intel_gt *gt);
192 
193 void intel_engine_free_request_pool(struct intel_engine_cs *engine);
194 
195 void intel_engines_release(struct intel_gt *gt);
196 void intel_engines_free(struct intel_gt *gt);
197 
198 int intel_engine_init_common(struct intel_engine_cs *engine);
199 void intel_engine_cleanup_common(struct intel_engine_cs *engine);
200 
201 int intel_engine_resume(struct intel_engine_cs *engine);
202 
203 int intel_ring_submission_setup(struct intel_engine_cs *engine);
204 
205 int intel_engine_stop_cs(struct intel_engine_cs *engine);
206 void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine);
207 
208 void intel_engine_set_hwsp_writemask(struct intel_engine_cs *engine, u32 mask);
209 
210 u64 intel_engine_get_active_head(const struct intel_engine_cs *engine);
211 u64 intel_engine_get_last_batch_head(const struct intel_engine_cs *engine);
212 
213 void intel_engine_get_instdone(const struct intel_engine_cs *engine,
214 			       struct intel_instdone *instdone);
215 
216 void intel_engine_init_execlists(struct intel_engine_cs *engine);
217 
218 bool intel_engine_irq_enable(struct intel_engine_cs *engine);
219 void intel_engine_irq_disable(struct intel_engine_cs *engine);
220 
221 static inline void __intel_engine_reset(struct intel_engine_cs *engine,
222 					bool stalled)
223 {
224 	if (engine->reset.rewind)
225 		engine->reset.rewind(engine, stalled);
226 	engine->serial++; /* contexts lost */
227 }
228 
229 bool intel_engines_are_idle(struct intel_gt *gt);
230 bool intel_engine_is_idle(struct intel_engine_cs *engine);
231 
232 void __intel_engine_flush_submission(struct intel_engine_cs *engine, bool sync);
233 static inline void intel_engine_flush_submission(struct intel_engine_cs *engine)
234 {
235 	__intel_engine_flush_submission(engine, true);
236 }
237 
238 void intel_engines_reset_default_submission(struct intel_gt *gt);
239 
240 bool intel_engine_can_store_dword(struct intel_engine_cs *engine);
241 
242 __printf(3, 4)
243 void intel_engine_dump(struct intel_engine_cs *engine,
244 		       struct drm_printer *m,
245 		       const char *header, ...);
246 void intel_engine_dump_active_requests(struct list_head *requests,
247 				       struct i915_request *hung_rq,
248 				       struct drm_printer *m);
249 
250 ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine,
251 				   ktime_t *now);
252 
253 struct i915_request *
254 intel_engine_execlist_find_hung_request(struct intel_engine_cs *engine);
255 
256 u32 intel_engine_context_size(struct intel_gt *gt, u8 class);
257 struct intel_context *
258 intel_engine_create_pinned_context(struct intel_engine_cs *engine,
259 				   struct i915_address_space *vm,
260 				   unsigned int ring_size,
261 				   unsigned int hwsp,
262 				   struct lock_class_key *key,
263 				   const char *name);
264 
265 void intel_engine_destroy_pinned_context(struct intel_context *ce);
266 
267 #define ENGINE_PHYSICAL	0
268 #define ENGINE_MOCK	1
269 #define ENGINE_VIRTUAL	2
270 
271 static inline bool intel_engine_uses_guc(const struct intel_engine_cs *engine)
272 {
273 	return engine->gt->submission_method >= INTEL_SUBMISSION_GUC;
274 }
275 
276 static inline bool
277 intel_engine_has_preempt_reset(const struct intel_engine_cs *engine)
278 {
279 	if (!CONFIG_DRM_I915_PREEMPT_TIMEOUT)
280 		return false;
281 
282 	return intel_engine_has_preemption(engine);
283 }
284 
285 #define FORCE_VIRTUAL	BIT(0)
286 struct intel_context *
287 intel_engine_create_virtual(struct intel_engine_cs **siblings,
288 			    unsigned int count, unsigned long flags);
289 
290 static inline struct intel_context *
291 intel_engine_create_parallel(struct intel_engine_cs **engines,
292 			     unsigned int num_engines,
293 			     unsigned int width)
294 {
295 	GEM_BUG_ON(!engines[0]->cops->create_parallel);
296 	return engines[0]->cops->create_parallel(engines, num_engines, width);
297 }
298 
299 static inline bool
300 intel_virtual_engine_has_heartbeat(const struct intel_engine_cs *engine)
301 {
302 	/*
303 	 * For non-GuC submission we expect the back-end to look at the
304 	 * heartbeat status of the actual physical engine that the work
305 	 * has been (or is being) scheduled on, so we should only reach
306 	 * here with GuC submission enabled.
307 	 */
308 	GEM_BUG_ON(!intel_engine_uses_guc(engine));
309 
310 	return intel_guc_virtual_engine_has_heartbeat(engine);
311 }
312 
313 static inline bool
314 intel_engine_has_heartbeat(const struct intel_engine_cs *engine)
315 {
316 	if (!CONFIG_DRM_I915_HEARTBEAT_INTERVAL)
317 		return false;
318 
319 	if (intel_engine_is_virtual(engine))
320 		return intel_virtual_engine_has_heartbeat(engine);
321 	else
322 		return READ_ONCE(engine->props.heartbeat_interval_ms);
323 }
324 
325 static inline struct intel_engine_cs *
326 intel_engine_get_sibling(struct intel_engine_cs *engine, unsigned int sibling)
327 {
328 	GEM_BUG_ON(!intel_engine_is_virtual(engine));
329 	return engine->cops->get_sibling(engine, sibling);
330 }
331 
332 static inline void
333 intel_engine_set_hung_context(struct intel_engine_cs *engine,
334 			      struct intel_context *ce)
335 {
336 	engine->hung_ce = ce;
337 }
338 
339 static inline void
340 intel_engine_clear_hung_context(struct intel_engine_cs *engine)
341 {
342 	intel_engine_set_hung_context(engine, NULL);
343 }
344 
345 static inline struct intel_context *
346 intel_engine_get_hung_context(struct intel_engine_cs *engine)
347 {
348 	return engine->hung_ce;
349 }
350 
351 #endif /* _INTEL_RINGBUFFER_H_ */
352