1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2020 Intel Corporation
4 */
5
6 #include "gen6_engine_cs.h"
7 #include "intel_engine.h"
8 #include "intel_gpu_commands.h"
9 #include "intel_gt.h"
10 #include "intel_gt_irq.h"
11 #include "intel_gt_pm_irq.h"
12 #include "intel_ring.h"
13
14 #define HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH * sizeof(u32))
15
16 /*
17 * Emits a PIPE_CONTROL with a non-zero post-sync operation, for
18 * implementing two workarounds on gen6. From section 1.4.7.1
19 * "PIPE_CONTROL" of the Sandy Bridge PRM volume 2 part 1:
20 *
21 * [DevSNB-C+{W/A}] Before any depth stall flush (including those
22 * produced by non-pipelined state commands), software needs to first
23 * send a PIPE_CONTROL with no bits set except Post-Sync Operation !=
24 * 0.
25 *
26 * [Dev-SNB{W/A}]: Before a PIPE_CONTROL with Write Cache Flush Enable
27 * =1, a PIPE_CONTROL with any non-zero post-sync-op is required.
28 *
29 * And the workaround for these two requires this workaround first:
30 *
31 * [Dev-SNB{W/A}]: Pipe-control with CS-stall bit set must be sent
32 * BEFORE the pipe-control with a post-sync op and no write-cache
33 * flushes.
34 *
35 * And this last workaround is tricky because of the requirements on
36 * that bit. From section 1.4.7.2.3 "Stall" of the Sandy Bridge PRM
37 * volume 2 part 1:
38 *
39 * "1 of the following must also be set:
40 * - Render Target Cache Flush Enable ([12] of DW1)
41 * - Depth Cache Flush Enable ([0] of DW1)
42 * - Stall at Pixel Scoreboard ([1] of DW1)
43 * - Depth Stall ([13] of DW1)
44 * - Post-Sync Operation ([13] of DW1)
45 * - Notify Enable ([8] of DW1)"
46 *
47 * The cache flushes require the workaround flush that triggered this
48 * one, so we can't use it. Depth stall would trigger the same.
49 * Post-sync nonzero is what triggered this second workaround, so we
50 * can't use that one either. Notify enable is IRQs, which aren't
51 * really our business. That leaves only stall at scoreboard.
52 */
53 static int
gen6_emit_post_sync_nonzero_flush(struct i915_request * rq)54 gen6_emit_post_sync_nonzero_flush(struct i915_request *rq)
55 {
56 u32 scratch_addr =
57 intel_gt_scratch_offset(rq->engine->gt,
58 INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
59 u32 *cs;
60
61 cs = intel_ring_begin(rq, 6);
62 if (IS_ERR(cs))
63 return PTR_ERR(cs);
64
65 *cs++ = GFX_OP_PIPE_CONTROL(5);
66 *cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD;
67 *cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT;
68 *cs++ = 0; /* low dword */
69 *cs++ = 0; /* high dword */
70 *cs++ = MI_NOOP;
71 intel_ring_advance(rq, cs);
72
73 cs = intel_ring_begin(rq, 6);
74 if (IS_ERR(cs))
75 return PTR_ERR(cs);
76
77 *cs++ = GFX_OP_PIPE_CONTROL(5);
78 *cs++ = PIPE_CONTROL_QW_WRITE;
79 *cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT;
80 *cs++ = 0;
81 *cs++ = 0;
82 *cs++ = MI_NOOP;
83 intel_ring_advance(rq, cs);
84
85 return 0;
86 }
87
gen6_emit_flush_rcs(struct i915_request * rq,u32 mode)88 int gen6_emit_flush_rcs(struct i915_request *rq, u32 mode)
89 {
90 u32 scratch_addr =
91 intel_gt_scratch_offset(rq->engine->gt,
92 INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
93 u32 *cs, flags = 0;
94 int ret;
95
96 /* Force SNB workarounds for PIPE_CONTROL flushes */
97 ret = gen6_emit_post_sync_nonzero_flush(rq);
98 if (ret)
99 return ret;
100
101 /*
102 * Just flush everything. Experiments have shown that reducing the
103 * number of bits based on the write domains has little performance
104 * impact. And when rearranging requests, the order of flushes is
105 * unknown.
106 */
107 if (mode & EMIT_FLUSH) {
108 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
109 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
110 /*
111 * Ensure that any following seqno writes only happen
112 * when the render cache is indeed flushed.
113 */
114 flags |= PIPE_CONTROL_CS_STALL;
115 }
116 if (mode & EMIT_INVALIDATE) {
117 flags |= PIPE_CONTROL_TLB_INVALIDATE;
118 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
119 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
120 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
121 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
122 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
123 /*
124 * TLB invalidate requires a post-sync write.
125 */
126 flags |= PIPE_CONTROL_QW_WRITE | PIPE_CONTROL_CS_STALL;
127 }
128
129 cs = intel_ring_begin(rq, 4);
130 if (IS_ERR(cs))
131 return PTR_ERR(cs);
132
133 *cs++ = GFX_OP_PIPE_CONTROL(4);
134 *cs++ = flags;
135 *cs++ = scratch_addr | PIPE_CONTROL_GLOBAL_GTT;
136 *cs++ = 0;
137 intel_ring_advance(rq, cs);
138
139 return 0;
140 }
141
gen6_emit_breadcrumb_rcs(struct i915_request * rq,u32 * cs)142 u32 *gen6_emit_breadcrumb_rcs(struct i915_request *rq, u32 *cs)
143 {
144 /* First we do the gen6_emit_post_sync_nonzero_flush w/a */
145 *cs++ = GFX_OP_PIPE_CONTROL(4);
146 *cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD;
147 *cs++ = 0;
148 *cs++ = 0;
149
150 *cs++ = GFX_OP_PIPE_CONTROL(4);
151 *cs++ = PIPE_CONTROL_QW_WRITE;
152 *cs++ = intel_gt_scratch_offset(rq->engine->gt,
153 INTEL_GT_SCRATCH_FIELD_DEFAULT) |
154 PIPE_CONTROL_GLOBAL_GTT;
155 *cs++ = 0;
156
157 /* Finally we can flush and with it emit the breadcrumb */
158 *cs++ = GFX_OP_PIPE_CONTROL(4);
159 *cs++ = (PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
160 PIPE_CONTROL_DEPTH_CACHE_FLUSH |
161 PIPE_CONTROL_DC_FLUSH_ENABLE |
162 PIPE_CONTROL_QW_WRITE |
163 PIPE_CONTROL_CS_STALL);
164 *cs++ = i915_request_active_seqno(rq) |
165 PIPE_CONTROL_GLOBAL_GTT;
166 *cs++ = rq->fence.seqno;
167
168 *cs++ = MI_USER_INTERRUPT;
169 *cs++ = MI_NOOP;
170
171 rq->tail = intel_ring_offset(rq, cs);
172 assert_ring_tail_valid(rq->ring, rq->tail);
173
174 return cs;
175 }
176
mi_flush_dw(struct i915_request * rq,u32 flags)177 static int mi_flush_dw(struct i915_request *rq, u32 flags)
178 {
179 u32 cmd, *cs;
180
181 cs = intel_ring_begin(rq, 4);
182 if (IS_ERR(cs))
183 return PTR_ERR(cs);
184
185 cmd = MI_FLUSH_DW;
186
187 /*
188 * We always require a command barrier so that subsequent
189 * commands, such as breadcrumb interrupts, are strictly ordered
190 * wrt the contents of the write cache being flushed to memory
191 * (and thus being coherent from the CPU).
192 */
193 cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
194
195 /*
196 * Bspec vol 1c.3 - blitter engine command streamer:
197 * "If ENABLED, all TLBs will be invalidated once the flush
198 * operation is complete. This bit is only valid when the
199 * Post-Sync Operation field is a value of 1h or 3h."
200 */
201 cmd |= flags;
202
203 *cs++ = cmd;
204 *cs++ = HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT;
205 *cs++ = 0;
206 *cs++ = MI_NOOP;
207
208 intel_ring_advance(rq, cs);
209
210 return 0;
211 }
212
gen6_flush_dw(struct i915_request * rq,u32 mode,u32 invflags)213 static int gen6_flush_dw(struct i915_request *rq, u32 mode, u32 invflags)
214 {
215 return mi_flush_dw(rq, mode & EMIT_INVALIDATE ? invflags : 0);
216 }
217
gen6_emit_flush_xcs(struct i915_request * rq,u32 mode)218 int gen6_emit_flush_xcs(struct i915_request *rq, u32 mode)
219 {
220 return gen6_flush_dw(rq, mode, MI_INVALIDATE_TLB);
221 }
222
gen6_emit_flush_vcs(struct i915_request * rq,u32 mode)223 int gen6_emit_flush_vcs(struct i915_request *rq, u32 mode)
224 {
225 return gen6_flush_dw(rq, mode, MI_INVALIDATE_TLB | MI_INVALIDATE_BSD);
226 }
227
gen6_emit_bb_start(struct i915_request * rq,u64 offset,u32 len,unsigned int dispatch_flags)228 int gen6_emit_bb_start(struct i915_request *rq,
229 u64 offset, u32 len,
230 unsigned int dispatch_flags)
231 {
232 u32 security;
233 u32 *cs;
234
235 security = MI_BATCH_NON_SECURE_I965;
236 if (dispatch_flags & I915_DISPATCH_SECURE)
237 security = 0;
238
239 cs = intel_ring_begin(rq, 2);
240 if (IS_ERR(cs))
241 return PTR_ERR(cs);
242
243 cs = __gen6_emit_bb_start(cs, offset, security);
244 intel_ring_advance(rq, cs);
245
246 return 0;
247 }
248
249 int
hsw_emit_bb_start(struct i915_request * rq,u64 offset,u32 len,unsigned int dispatch_flags)250 hsw_emit_bb_start(struct i915_request *rq,
251 u64 offset, u32 len,
252 unsigned int dispatch_flags)
253 {
254 u32 security;
255 u32 *cs;
256
257 security = MI_BATCH_PPGTT_HSW | MI_BATCH_NON_SECURE_HSW;
258 if (dispatch_flags & I915_DISPATCH_SECURE)
259 security = 0;
260
261 cs = intel_ring_begin(rq, 2);
262 if (IS_ERR(cs))
263 return PTR_ERR(cs);
264
265 cs = __gen6_emit_bb_start(cs, offset, security);
266 intel_ring_advance(rq, cs);
267
268 return 0;
269 }
270
gen7_stall_cs(struct i915_request * rq)271 static int gen7_stall_cs(struct i915_request *rq)
272 {
273 u32 *cs;
274
275 cs = intel_ring_begin(rq, 4);
276 if (IS_ERR(cs))
277 return PTR_ERR(cs);
278
279 *cs++ = GFX_OP_PIPE_CONTROL(4);
280 *cs++ = PIPE_CONTROL_CS_STALL | PIPE_CONTROL_STALL_AT_SCOREBOARD;
281 *cs++ = 0;
282 *cs++ = 0;
283 intel_ring_advance(rq, cs);
284
285 return 0;
286 }
287
gen7_emit_flush_rcs(struct i915_request * rq,u32 mode)288 int gen7_emit_flush_rcs(struct i915_request *rq, u32 mode)
289 {
290 u32 scratch_addr =
291 intel_gt_scratch_offset(rq->engine->gt,
292 INTEL_GT_SCRATCH_FIELD_RENDER_FLUSH);
293 u32 *cs, flags = 0;
294
295 /*
296 * Ensure that any following seqno writes only happen when the render
297 * cache is indeed flushed.
298 *
299 * Workaround: 4th PIPE_CONTROL command (except the ones with only
300 * read-cache invalidate bits set) must have the CS_STALL bit set. We
301 * don't try to be clever and just set it unconditionally.
302 */
303 flags |= PIPE_CONTROL_CS_STALL;
304
305 /*
306 * CS_STALL suggests at least a post-sync write.
307 */
308 flags |= PIPE_CONTROL_QW_WRITE;
309 flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
310
311 /*
312 * Just flush everything. Experiments have shown that reducing the
313 * number of bits based on the write domains has little performance
314 * impact.
315 */
316 if (mode & EMIT_FLUSH) {
317 flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
318 flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
319 flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
320 flags |= PIPE_CONTROL_FLUSH_ENABLE;
321 }
322 if (mode & EMIT_INVALIDATE) {
323 flags |= PIPE_CONTROL_TLB_INVALIDATE;
324 flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
325 flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
326 flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
327 flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
328 flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
329 flags |= PIPE_CONTROL_MEDIA_STATE_CLEAR;
330
331 /*
332 * Workaround: we must issue a pipe_control with CS-stall bit
333 * set before a pipe_control command that has the state cache
334 * invalidate bit set.
335 */
336 gen7_stall_cs(rq);
337 }
338
339 cs = intel_ring_begin(rq, 4);
340 if (IS_ERR(cs))
341 return PTR_ERR(cs);
342
343 *cs++ = GFX_OP_PIPE_CONTROL(4);
344 *cs++ = flags;
345 *cs++ = scratch_addr;
346 *cs++ = 0;
347 intel_ring_advance(rq, cs);
348
349 return 0;
350 }
351
gen7_emit_breadcrumb_rcs(struct i915_request * rq,u32 * cs)352 u32 *gen7_emit_breadcrumb_rcs(struct i915_request *rq, u32 *cs)
353 {
354 *cs++ = GFX_OP_PIPE_CONTROL(4);
355 *cs++ = (PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
356 PIPE_CONTROL_DEPTH_CACHE_FLUSH |
357 PIPE_CONTROL_DC_FLUSH_ENABLE |
358 PIPE_CONTROL_FLUSH_ENABLE |
359 PIPE_CONTROL_QW_WRITE |
360 PIPE_CONTROL_GLOBAL_GTT_IVB |
361 PIPE_CONTROL_CS_STALL);
362 *cs++ = i915_request_active_seqno(rq);
363 *cs++ = rq->fence.seqno;
364
365 *cs++ = MI_USER_INTERRUPT;
366 *cs++ = MI_NOOP;
367
368 rq->tail = intel_ring_offset(rq, cs);
369 assert_ring_tail_valid(rq->ring, rq->tail);
370
371 return cs;
372 }
373
gen6_emit_breadcrumb_xcs(struct i915_request * rq,u32 * cs)374 u32 *gen6_emit_breadcrumb_xcs(struct i915_request *rq, u32 *cs)
375 {
376 GEM_BUG_ON(i915_request_active_timeline(rq)->hwsp_ggtt != rq->engine->status_page.vma);
377 GEM_BUG_ON(offset_in_page(rq->hwsp_seqno) != I915_GEM_HWS_SEQNO_ADDR);
378
379 *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
380 *cs++ = I915_GEM_HWS_SEQNO_ADDR | MI_FLUSH_DW_USE_GTT;
381 *cs++ = rq->fence.seqno;
382
383 *cs++ = MI_USER_INTERRUPT;
384
385 rq->tail = intel_ring_offset(rq, cs);
386 assert_ring_tail_valid(rq->ring, rq->tail);
387
388 return cs;
389 }
390
391 #define GEN7_XCS_WA 32
gen7_emit_breadcrumb_xcs(struct i915_request * rq,u32 * cs)392 u32 *gen7_emit_breadcrumb_xcs(struct i915_request *rq, u32 *cs)
393 {
394 int i;
395
396 GEM_BUG_ON(i915_request_active_timeline(rq)->hwsp_ggtt != rq->engine->status_page.vma);
397 GEM_BUG_ON(offset_in_page(rq->hwsp_seqno) != I915_GEM_HWS_SEQNO_ADDR);
398
399 *cs++ = MI_FLUSH_DW | MI_INVALIDATE_TLB |
400 MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
401 *cs++ = I915_GEM_HWS_SEQNO_ADDR | MI_FLUSH_DW_USE_GTT;
402 *cs++ = rq->fence.seqno;
403
404 for (i = 0; i < GEN7_XCS_WA; i++) {
405 *cs++ = MI_STORE_DWORD_INDEX;
406 *cs++ = I915_GEM_HWS_SEQNO_ADDR;
407 *cs++ = rq->fence.seqno;
408 }
409
410 *cs++ = MI_FLUSH_DW;
411 *cs++ = 0;
412 *cs++ = 0;
413
414 *cs++ = MI_USER_INTERRUPT;
415 *cs++ = MI_NOOP;
416
417 rq->tail = intel_ring_offset(rq, cs);
418 assert_ring_tail_valid(rq->ring, rq->tail);
419
420 return cs;
421 }
422 #undef GEN7_XCS_WA
423
gen6_irq_enable(struct intel_engine_cs * engine)424 void gen6_irq_enable(struct intel_engine_cs *engine)
425 {
426 ENGINE_WRITE(engine, RING_IMR,
427 ~(engine->irq_enable_mask | engine->irq_keep_mask));
428
429 /* Flush/delay to ensure the RING_IMR is active before the GT IMR */
430 ENGINE_POSTING_READ(engine, RING_IMR);
431
432 gen5_gt_enable_irq(engine->gt, engine->irq_enable_mask);
433 }
434
gen6_irq_disable(struct intel_engine_cs * engine)435 void gen6_irq_disable(struct intel_engine_cs *engine)
436 {
437 ENGINE_WRITE(engine, RING_IMR, ~engine->irq_keep_mask);
438 gen5_gt_disable_irq(engine->gt, engine->irq_enable_mask);
439 }
440
hsw_irq_enable_vecs(struct intel_engine_cs * engine)441 void hsw_irq_enable_vecs(struct intel_engine_cs *engine)
442 {
443 ENGINE_WRITE(engine, RING_IMR, ~engine->irq_enable_mask);
444
445 /* Flush/delay to ensure the RING_IMR is active before the GT IMR */
446 ENGINE_POSTING_READ(engine, RING_IMR);
447
448 gen6_gt_pm_unmask_irq(engine->gt, engine->irq_enable_mask);
449 }
450
hsw_irq_disable_vecs(struct intel_engine_cs * engine)451 void hsw_irq_disable_vecs(struct intel_engine_cs *engine)
452 {
453 ENGINE_WRITE(engine, RING_IMR, ~0);
454 gen6_gt_pm_mask_irq(engine->gt, engine->irq_enable_mask);
455 }
456