1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#include "gt/intel_engine_pm.h"
7#include "gt/intel_gpu_commands.h"
8#include "i915_selftest.h"
9
10#include "gem/selftests/igt_gem_utils.h"
11#include "gem/selftests/mock_context.h"
12#include "selftests/igt_reset.h"
13#include "selftests/igt_spinner.h"
14#include "selftests/intel_scheduler_helpers.h"
15
16struct live_mocs {
17 struct drm_i915_mocs_table table;
18 struct drm_i915_mocs_table *mocs;
19 struct drm_i915_mocs_table *l3cc;
20 struct i915_vma *scratch;
21 void *vaddr;
22};
23
24static struct intel_context *mocs_context_create(struct intel_engine_cs *engine)
25{
26 struct intel_context *ce;
27
28 ce = intel_context_create(engine);
29 if (IS_ERR(ptr: ce))
30 return ce;
31
32 /* We build large requests to read the registers from the ring */
33 ce->ring_size = SZ_16K;
34
35 return ce;
36}
37
38static int request_add_sync(struct i915_request *rq, int err)
39{
40 i915_request_get(rq);
41 i915_request_add(rq);
42 if (i915_request_wait(rq, flags: 0, HZ / 5) < 0)
43 err = -ETIME;
44 i915_request_put(rq);
45
46 return err;
47}
48
49static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin)
50{
51 int err = 0;
52
53 i915_request_get(rq);
54 i915_request_add(rq);
55 if (spin && !igt_wait_for_spinner(spin, rq))
56 err = -ETIME;
57 i915_request_put(rq);
58
59 return err;
60}
61
62static int live_mocs_init(struct live_mocs *arg, struct intel_gt *gt)
63{
64 unsigned int flags;
65 int err;
66
67 memset(arg, 0, sizeof(*arg));
68
69 flags = get_mocs_settings(i915: gt->i915, table: &arg->table);
70 if (!flags)
71 return -EINVAL;
72
73 if (flags & HAS_RENDER_L3CC)
74 arg->l3cc = &arg->table;
75
76 if (flags & (HAS_GLOBAL_MOCS | HAS_ENGINE_MOCS))
77 arg->mocs = &arg->table;
78
79 arg->scratch =
80 __vm_create_scratch_for_read_pinned(vm: &gt->ggtt->vm, PAGE_SIZE);
81 if (IS_ERR(ptr: arg->scratch))
82 return PTR_ERR(ptr: arg->scratch);
83
84 arg->vaddr = i915_gem_object_pin_map_unlocked(obj: arg->scratch->obj, type: I915_MAP_WB);
85 if (IS_ERR(ptr: arg->vaddr)) {
86 err = PTR_ERR(ptr: arg->vaddr);
87 goto err_scratch;
88 }
89
90 return 0;
91
92err_scratch:
93 i915_vma_unpin_and_release(p_vma: &arg->scratch, flags: 0);
94 return err;
95}
96
97static void live_mocs_fini(struct live_mocs *arg)
98{
99 i915_vma_unpin_and_release(p_vma: &arg->scratch, I915_VMA_RELEASE_MAP);
100}
101
102static int read_regs(struct i915_request *rq,
103 u32 addr, unsigned int count,
104 u32 *offset)
105{
106 unsigned int i;
107 u32 *cs;
108
109 GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32)));
110
111 cs = intel_ring_begin(rq, num_dwords: 4 * count);
112 if (IS_ERR(ptr: cs))
113 return PTR_ERR(ptr: cs);
114
115 for (i = 0; i < count; i++) {
116 *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
117 *cs++ = addr;
118 *cs++ = *offset;
119 *cs++ = 0;
120
121 addr += sizeof(u32);
122 *offset += sizeof(u32);
123 }
124
125 intel_ring_advance(rq, cs);
126
127 return 0;
128}
129
130static int read_mocs_table(struct i915_request *rq,
131 const struct drm_i915_mocs_table *table,
132 u32 *offset)
133{
134 struct intel_gt *gt = rq->engine->gt;
135 u32 addr;
136
137 if (!table)
138 return 0;
139
140 if (HAS_GLOBAL_MOCS_REGISTERS(rq->i915))
141 addr = global_mocs_offset() + gt->uncore->gsi_offset;
142 else
143 addr = mocs_offset(engine: rq->engine);
144
145 return read_regs(rq, addr, count: table->n_entries, offset);
146}
147
148static int read_l3cc_table(struct i915_request *rq,
149 const struct drm_i915_mocs_table *table,
150 u32 *offset)
151{
152 u32 addr = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));
153
154 if (!table)
155 return 0;
156
157 return read_regs(rq, addr, count: (table->n_entries + 1) / 2, offset);
158}
159
160static int check_mocs_table(struct intel_engine_cs *engine,
161 const struct drm_i915_mocs_table *table,
162 u32 **vaddr)
163{
164 unsigned int i;
165 u32 expect;
166
167 if (!table)
168 return 0;
169
170 for_each_mocs(expect, table, i) {
171 if (**vaddr != expect) {
172 pr_err("%s: Invalid MOCS[%d] entry, found %08x, expected %08x\n",
173 engine->name, i, **vaddr, expect);
174 return -EINVAL;
175 }
176 ++*vaddr;
177 }
178
179 return 0;
180}
181
182static bool mcr_range(struct drm_i915_private *i915, u32 offset)
183{
184 /*
185 * Registers in this range are affected by the MCR selector
186 * which only controls CPU initiated MMIO. Routing does not
187 * work for CS access so we cannot verify them on this path.
188 */
189 return GRAPHICS_VER(i915) >= 8 && offset >= 0xb000 && offset <= 0xb4ff;
190}
191
192static int check_l3cc_table(struct intel_engine_cs *engine,
193 const struct drm_i915_mocs_table *table,
194 u32 **vaddr)
195{
196 /* Can we read the MCR range 0xb00 directly? See intel_workarounds! */
197 u32 reg = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));
198 unsigned int i;
199 u32 expect;
200
201 if (!table)
202 return 0;
203
204 for_each_l3cc(expect, table, i) {
205 if (!mcr_range(i915: engine->i915, offset: reg) && **vaddr != expect) {
206 pr_err("%s: Invalid L3CC[%d] entry, found %08x, expected %08x\n",
207 engine->name, i, **vaddr, expect);
208 return -EINVAL;
209 }
210 ++*vaddr;
211 reg += 4;
212 }
213
214 return 0;
215}
216
217static int check_mocs_engine(struct live_mocs *arg,
218 struct intel_context *ce)
219{
220 struct i915_vma *vma = arg->scratch;
221 struct i915_request *rq;
222 u32 offset;
223 u32 *vaddr;
224 int err;
225
226 memset32(s: arg->vaddr, STACK_MAGIC, PAGE_SIZE / sizeof(u32));
227
228 rq = intel_context_create_request(ce);
229 if (IS_ERR(ptr: rq))
230 return PTR_ERR(ptr: rq);
231
232 err = igt_vma_move_to_active_unlocked(vma, rq, EXEC_OBJECT_WRITE);
233
234 /* Read the mocs tables back using SRM */
235 offset = i915_ggtt_offset(vma);
236 if (!err)
237 err = read_mocs_table(rq, table: arg->mocs, offset: &offset);
238 if (!err && ce->engine->class == RENDER_CLASS)
239 err = read_l3cc_table(rq, table: arg->l3cc, offset: &offset);
240 offset -= i915_ggtt_offset(vma);
241 GEM_BUG_ON(offset > PAGE_SIZE);
242
243 err = request_add_sync(rq, err);
244 if (err)
245 return err;
246
247 /* Compare the results against the expected tables */
248 vaddr = arg->vaddr;
249 if (!err)
250 err = check_mocs_table(engine: ce->engine, table: arg->mocs, vaddr: &vaddr);
251 if (!err && ce->engine->class == RENDER_CLASS)
252 err = check_l3cc_table(engine: ce->engine, table: arg->l3cc, vaddr: &vaddr);
253 if (err)
254 return err;
255
256 GEM_BUG_ON(arg->vaddr + offset != vaddr);
257 return 0;
258}
259
260static int live_mocs_kernel(void *arg)
261{
262 struct intel_gt *gt = arg;
263 struct intel_engine_cs *engine;
264 enum intel_engine_id id;
265 struct live_mocs mocs;
266 int err;
267
268 /* Basic check the system is configured with the expected mocs table */
269
270 err = live_mocs_init(arg: &mocs, gt);
271 if (err)
272 return err;
273
274 for_each_engine(engine, gt, id) {
275 intel_engine_pm_get(engine);
276 err = check_mocs_engine(arg: &mocs, ce: engine->kernel_context);
277 intel_engine_pm_put(engine);
278 if (err)
279 break;
280 }
281
282 live_mocs_fini(arg: &mocs);
283 return err;
284}
285
286static int live_mocs_clean(void *arg)
287{
288 struct intel_gt *gt = arg;
289 struct intel_engine_cs *engine;
290 enum intel_engine_id id;
291 struct live_mocs mocs;
292 int err;
293
294 /* Every new context should see the same mocs table */
295
296 err = live_mocs_init(arg: &mocs, gt);
297 if (err)
298 return err;
299
300 for_each_engine(engine, gt, id) {
301 struct intel_context *ce;
302
303 ce = mocs_context_create(engine);
304 if (IS_ERR(ptr: ce)) {
305 err = PTR_ERR(ptr: ce);
306 break;
307 }
308
309 err = check_mocs_engine(arg: &mocs, ce);
310 intel_context_put(ce);
311 if (err)
312 break;
313 }
314
315 live_mocs_fini(arg: &mocs);
316 return err;
317}
318
319static int active_engine_reset(struct intel_context *ce,
320 const char *reason,
321 bool using_guc)
322{
323 struct igt_spinner spin;
324 struct i915_request *rq;
325 int err;
326
327 err = igt_spinner_init(spin: &spin, gt: ce->engine->gt);
328 if (err)
329 return err;
330
331 rq = igt_spinner_create_request(spin: &spin, ce, MI_NOOP);
332 if (IS_ERR(ptr: rq)) {
333 igt_spinner_fini(spin: &spin);
334 return PTR_ERR(ptr: rq);
335 }
336
337 err = request_add_spin(rq, spin: &spin);
338 if (err == 0 && !using_guc)
339 err = intel_engine_reset(engine: ce->engine, reason);
340
341 /* Ensure the reset happens and kills the engine */
342 if (err == 0)
343 err = intel_selftest_wait_for_rq(rq);
344
345 igt_spinner_end(spin: &spin);
346 igt_spinner_fini(spin: &spin);
347
348 return err;
349}
350
351static int __live_mocs_reset(struct live_mocs *mocs,
352 struct intel_context *ce, bool using_guc)
353{
354 struct intel_gt *gt = ce->engine->gt;
355 int err;
356
357 if (intel_has_reset_engine(gt)) {
358 if (!using_guc) {
359 err = intel_engine_reset(engine: ce->engine, reason: "mocs");
360 if (err)
361 return err;
362
363 err = check_mocs_engine(arg: mocs, ce);
364 if (err)
365 return err;
366 }
367
368 err = active_engine_reset(ce, reason: "mocs", using_guc);
369 if (err)
370 return err;
371
372 err = check_mocs_engine(arg: mocs, ce);
373 if (err)
374 return err;
375 }
376
377 if (intel_has_gpu_reset(gt)) {
378 intel_gt_reset(gt, stalled_mask: ce->engine->mask, reason: "mocs");
379
380 err = check_mocs_engine(arg: mocs, ce);
381 if (err)
382 return err;
383 }
384
385 return 0;
386}
387
388static int live_mocs_reset(void *arg)
389{
390 struct intel_gt *gt = arg;
391 struct intel_engine_cs *engine;
392 enum intel_engine_id id;
393 struct live_mocs mocs;
394 int err = 0;
395
396 /* Check the mocs setup is retained over per-engine and global resets */
397
398 err = live_mocs_init(arg: &mocs, gt);
399 if (err)
400 return err;
401
402 igt_global_reset_lock(gt);
403 for_each_engine(engine, gt, id) {
404 bool using_guc = intel_engine_uses_guc(engine);
405 struct intel_selftest_saved_policy saved;
406 struct intel_context *ce;
407 int err2;
408
409 err = intel_selftest_modify_policy(engine, saved: &saved,
410 modify_type: SELFTEST_SCHEDULER_MODIFY_FAST_RESET);
411 if (err)
412 break;
413
414 ce = mocs_context_create(engine);
415 if (IS_ERR(ptr: ce)) {
416 err = PTR_ERR(ptr: ce);
417 goto restore;
418 }
419
420 intel_engine_pm_get(engine);
421
422 err = __live_mocs_reset(mocs: &mocs, ce, using_guc);
423
424 intel_engine_pm_put(engine);
425 intel_context_put(ce);
426
427restore:
428 err2 = intel_selftest_restore_policy(engine, saved: &saved);
429 if (err == 0)
430 err = err2;
431 if (err)
432 break;
433 }
434 igt_global_reset_unlock(gt);
435
436 live_mocs_fini(arg: &mocs);
437 return err;
438}
439
440int intel_mocs_live_selftests(struct drm_i915_private *i915)
441{
442 static const struct i915_subtest tests[] = {
443 SUBTEST(live_mocs_kernel),
444 SUBTEST(live_mocs_clean),
445 SUBTEST(live_mocs_reset),
446 };
447 struct drm_i915_mocs_table table;
448
449 if (!get_mocs_settings(i915, table: &table))
450 return 0;
451
452 return intel_gt_live_subtests(tests, to_gt(i915));
453}
454

source code of linux/drivers/gpu/drm/i915/gt/selftest_mocs.c