1 // SPDX-License-Identifier: MIT
3 * Copyright © 2016-2019 Intel Corporation
6 #include <linux/types.h>
8 #include "gt/intel_gt.h"
9 #include "gt/intel_rps.h"
10 #include "intel_guc_reg.h"
11 #include "intel_huc.h"
12 #include "intel_huc_print.h"
15 #include "pxp/intel_pxp_cmd_interface_43.h"
17 #include <linux/device/bus.h>
18 #include <linux/mei_aux.h>
23 * The HuC is a dedicated microcontroller for usage in media HEVC (High
24 * Efficiency Video Coding) operations. Userspace can directly use the firmware
25 * capabilities by adding HuC specific commands to batch buffers.
27 * The kernel driver is only responsible for loading the HuC firmware and
28 * triggering its security authentication. This is done differently depending
31 * - older platforms (from Gen9 to most Gen12s): the load is performed via DMA
32 * and the authentication via GuC
33 * - DG2: load and authentication are both performed via GSC.
34 * - MTL and newer platforms: the load is performed via DMA (same as with
35 * not-DG2 older platforms), while the authentication is done in 2-steps,
36 * a first auth for clear-media workloads via GuC and a second one for all
39 * On platforms where the GuC does the authentication, to correctly do so the
40 * HuC binary must be loaded before the GuC one.
41 * Loading the HuC is optional; however, not using the HuC might negatively
42 * impact power usage and/or performance of media workloads, depending on the
44 * HuC must be reloaded on events that cause the WOPCM to lose its contents
45 * (S3/S4, FLR); on older platforms the HuC must also be reloaded on GuC/GT
46 * reset, while on newer ones it will survive that.
48 * See https://github.com/intel/media-driver for the latest details on HuC
53 * DOC: HuC Memory Management
55 * Similarly to the GuC, the HuC can't do any memory allocations on its own,
56 * with the difference being that the allocations for HuC usage are handled by
57 * the userspace driver instead of the kernel one. The HuC accesses the memory
58 * via the PPGTT belonging to the context loaded on the VCS executing the
59 * HuC-specific commands.
63 * MEI-GSC load is an async process. The probing of the exposed aux device
64 * (see intel_gsc.c) usually happens a few seconds after i915 probe, depending
65 * on when the kernel schedules it. Unless something goes terribly wrong, we're
66 * guaranteed for this to happen during boot, so the big timeout is a safety net
67 * that we never expect to need.
68 * MEI-PXP + HuC load usually takes ~300ms, but if the GSC needs to be resumed
69 * and/or reset, this can take longer. Note that the kernel might schedule
70 * other work between the i915 init/resume and the MEI one, which can add to
73 #define GSC_INIT_TIMEOUT_MS 10000
74 #define PXP_INIT_TIMEOUT_MS 5000
76 static int sw_fence_dummy_notify(struct i915_sw_fence *sf,
77 enum i915_sw_fence_notify state)
82 static void __delayed_huc_load_complete(struct intel_huc *huc)
84 if (!i915_sw_fence_done(&huc->delayed_load.fence))
85 i915_sw_fence_complete(&huc->delayed_load.fence);
88 static void delayed_huc_load_complete(struct intel_huc *huc)
90 hrtimer_cancel(&huc->delayed_load.timer);
91 __delayed_huc_load_complete(huc);
94 static void __gsc_init_error(struct intel_huc *huc)
96 huc->delayed_load.status = INTEL_HUC_DELAYED_LOAD_ERROR;
97 __delayed_huc_load_complete(huc);
100 static void gsc_init_error(struct intel_huc *huc)
102 hrtimer_cancel(&huc->delayed_load.timer);
103 __gsc_init_error(huc);
106 static void gsc_init_done(struct intel_huc *huc)
108 hrtimer_cancel(&huc->delayed_load.timer);
110 /* MEI-GSC init is done, now we wait for MEI-PXP to bind */
111 huc->delayed_load.status = INTEL_HUC_WAITING_ON_PXP;
112 if (!i915_sw_fence_done(&huc->delayed_load.fence))
113 hrtimer_start(&huc->delayed_load.timer,
114 ms_to_ktime(PXP_INIT_TIMEOUT_MS),
118 static enum hrtimer_restart huc_delayed_load_timer_callback(struct hrtimer *hrtimer)
120 struct intel_huc *huc = container_of(hrtimer, struct intel_huc, delayed_load.timer);
122 if (!intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC)) {
123 if (huc->delayed_load.status == INTEL_HUC_WAITING_ON_GSC)
124 huc_notice(huc, "timed out waiting for MEI GSC\n");
125 else if (huc->delayed_load.status == INTEL_HUC_WAITING_ON_PXP)
126 huc_notice(huc, "timed out waiting for MEI PXP\n");
128 MISSING_CASE(huc->delayed_load.status);
130 __gsc_init_error(huc);
133 return HRTIMER_NORESTART;
136 static void huc_delayed_load_start(struct intel_huc *huc)
140 GEM_BUG_ON(intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC));
143 * On resume we don't have to wait for MEI-GSC to be re-probed, but we
144 * do need to wait for MEI-PXP to reset & re-bind
146 switch (huc->delayed_load.status) {
147 case INTEL_HUC_WAITING_ON_GSC:
148 delay = ms_to_ktime(GSC_INIT_TIMEOUT_MS);
150 case INTEL_HUC_WAITING_ON_PXP:
151 delay = ms_to_ktime(PXP_INIT_TIMEOUT_MS);
159 * This fence is always complete unless we're waiting for the
160 * GSC device to come up to load the HuC. We arm the fence here
161 * and complete it when we confirm that the HuC is loaded from
162 * the PXP bind callback.
164 GEM_BUG_ON(!i915_sw_fence_done(&huc->delayed_load.fence));
165 i915_sw_fence_fini(&huc->delayed_load.fence);
166 i915_sw_fence_reinit(&huc->delayed_load.fence);
167 i915_sw_fence_await(&huc->delayed_load.fence);
168 i915_sw_fence_commit(&huc->delayed_load.fence);
170 hrtimer_start(&huc->delayed_load.timer, delay, HRTIMER_MODE_REL);
173 static int gsc_notifier(struct notifier_block *nb, unsigned long action, void *data)
175 struct device *dev = data;
176 struct intel_huc *huc = container_of(nb, struct intel_huc, delayed_load.nb);
177 struct intel_gsc_intf *intf = &huc_to_gt(huc)->gsc.intf[0];
179 if (!intf->adev || &intf->adev->aux_dev.dev != dev)
183 case BUS_NOTIFY_BOUND_DRIVER: /* mei driver bound to aux device */
187 case BUS_NOTIFY_DRIVER_NOT_BOUND: /* mei driver fails to be bound */
188 case BUS_NOTIFY_UNBIND_DRIVER: /* mei driver about to be unbound */
189 huc_info(huc, "MEI driver not bound, disabling load\n");
197 void intel_huc_register_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus)
201 if (!intel_huc_is_loaded_by_gsc(huc))
204 huc->delayed_load.nb.notifier_call = gsc_notifier;
205 ret = bus_register_notifier(bus, &huc->delayed_load.nb);
207 huc_err(huc, "failed to register GSC notifier %pe\n", ERR_PTR(ret));
208 huc->delayed_load.nb.notifier_call = NULL;
213 void intel_huc_unregister_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus)
215 if (!huc->delayed_load.nb.notifier_call)
218 delayed_huc_load_complete(huc);
220 bus_unregister_notifier(bus, &huc->delayed_load.nb);
221 huc->delayed_load.nb.notifier_call = NULL;
224 static void delayed_huc_load_init(struct intel_huc *huc)
227 * Initialize fence to be complete as this is expected to be complete
228 * unless there is a delayed HuC load in progress.
230 i915_sw_fence_init(&huc->delayed_load.fence,
231 sw_fence_dummy_notify);
232 i915_sw_fence_commit(&huc->delayed_load.fence);
234 hrtimer_init(&huc->delayed_load.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
235 huc->delayed_load.timer.function = huc_delayed_load_timer_callback;
238 static void delayed_huc_load_fini(struct intel_huc *huc)
241 * the fence is initialized in init_early, so we need to clean it up
242 * even if HuC loading is off.
244 delayed_huc_load_complete(huc);
245 i915_sw_fence_fini(&huc->delayed_load.fence);
248 int intel_huc_sanitize(struct intel_huc *huc)
250 delayed_huc_load_complete(huc);
251 intel_uc_fw_sanitize(&huc->fw);
255 static bool vcs_supported(struct intel_gt *gt)
257 intel_engine_mask_t mask = gt->info.engine_mask;
260 * We reach here from i915_driver_early_probe for the primary GT before
261 * its engine mask is set, so we use the device info engine mask for it;
262 * this means we're not taking VCS fusing into account, but if the
263 * primary GT supports VCS engines we expect at least one of them to
264 * remain unfused so we're fine.
265 * For other GTs we expect the GT-specific mask to be set before we
266 * call this function.
268 GEM_BUG_ON(!gt_is_root(gt) && !gt->info.engine_mask);
271 mask = INTEL_INFO(gt->i915)->platform_engine_mask;
273 mask = gt->info.engine_mask;
275 return __ENGINE_INSTANCES_MASK(mask, VCS0, I915_MAX_VCS);
278 void intel_huc_init_early(struct intel_huc *huc)
280 struct drm_i915_private *i915 = huc_to_gt(huc)->i915;
281 struct intel_gt *gt = huc_to_gt(huc);
283 intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC, true);
286 * we always init the fence as already completed, even if HuC is not
287 * supported. This way we don't have to distinguish between HuC not
288 * supported/disabled or already loaded, and can focus on if the load
289 * is currently in progress (fence not complete) or not, which is what
290 * we care about for stalling userspace submissions.
292 delayed_huc_load_init(huc);
294 if (!vcs_supported(gt)) {
295 intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_NOT_SUPPORTED);
299 if (GRAPHICS_VER(i915) >= 11) {
300 huc->status[INTEL_HUC_AUTH_BY_GUC].reg = GEN11_HUC_KERNEL_LOAD_INFO;
301 huc->status[INTEL_HUC_AUTH_BY_GUC].mask = HUC_LOAD_SUCCESSFUL;
302 huc->status[INTEL_HUC_AUTH_BY_GUC].value = HUC_LOAD_SUCCESSFUL;
304 huc->status[INTEL_HUC_AUTH_BY_GUC].reg = HUC_STATUS2;
305 huc->status[INTEL_HUC_AUTH_BY_GUC].mask = HUC_FW_VERIFIED;
306 huc->status[INTEL_HUC_AUTH_BY_GUC].value = HUC_FW_VERIFIED;
310 huc->status[INTEL_HUC_AUTH_BY_GSC].reg = GEN11_HUC_KERNEL_LOAD_INFO;
311 huc->status[INTEL_HUC_AUTH_BY_GSC].mask = HUC_LOAD_SUCCESSFUL;
312 huc->status[INTEL_HUC_AUTH_BY_GSC].value = HUC_LOAD_SUCCESSFUL;
314 huc->status[INTEL_HUC_AUTH_BY_GSC].reg = HECI_FWSTS(MTL_GSC_HECI1_BASE, 5);
315 huc->status[INTEL_HUC_AUTH_BY_GSC].mask = HECI1_FWSTS5_HUC_AUTH_DONE;
316 huc->status[INTEL_HUC_AUTH_BY_GSC].value = HECI1_FWSTS5_HUC_AUTH_DONE;
320 #define HUC_LOAD_MODE_STRING(x) (x ? "GSC" : "legacy")
321 static int check_huc_loading_mode(struct intel_huc *huc)
323 struct intel_gt *gt = huc_to_gt(huc);
324 bool gsc_enabled = huc->fw.has_gsc_headers;
327 * The fuse for HuC load via GSC is only valid on platforms that have
330 if (HAS_GUC_DEPRIVILEGE(gt->i915))
331 huc->loaded_via_gsc = intel_uncore_read(gt->uncore, GUC_SHIM_CONTROL2) &
334 if (huc->loaded_via_gsc && !gsc_enabled) {
335 huc_err(huc, "HW requires a GSC-enabled blob, but we found a legacy one\n");
340 * On newer platforms we have GSC-enabled binaries but we load the HuC
341 * via DMA. To do so we need to find the location of the legacy-style
342 * binary inside the GSC-enabled one, which we do at fetch time. Make
343 * sure that we were able to do so if the fuse says we need to load via
344 * DMA and the binary is GSC-enabled.
346 if (!huc->loaded_via_gsc && gsc_enabled && !huc->fw.dma_start_offset) {
347 huc_err(huc, "HW in DMA mode, but we have an incompatible GSC-enabled blob\n");
352 * If the HuC is loaded via GSC, we need to be able to access the GSC.
353 * On DG2 this is done via the mei components, while on newer platforms
354 * it is done via the GSCCS,
356 if (huc->loaded_via_gsc) {
357 if (IS_DG2(gt->i915)) {
358 if (!IS_ENABLED(CONFIG_INTEL_MEI_PXP) ||
359 !IS_ENABLED(CONFIG_INTEL_MEI_GSC)) {
360 huc_info(huc, "can't load due to missing mei modules\n");
364 if (!HAS_ENGINE(gt, GSC0)) {
365 huc_info(huc, "can't load due to missing GSCCS\n");
371 huc_dbg(huc, "loaded by GSC = %s\n", str_yes_no(huc->loaded_via_gsc));
376 int intel_huc_init(struct intel_huc *huc)
378 struct intel_gt *gt = huc_to_gt(huc);
381 err = check_huc_loading_mode(huc);
385 if (HAS_ENGINE(gt, GSC0)) {
386 struct i915_vma *vma;
388 vma = intel_guc_allocate_vma(gt_to_guc(gt), PXP43_HUC_AUTH_INOUT_SIZE * 2);
391 huc_info(huc, "Failed to allocate heci pkt\n");
398 err = intel_uc_fw_init(&huc->fw);
402 intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_LOADABLE);
408 i915_vma_unpin_and_release(&huc->heci_pkt, 0);
410 intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_INIT_FAIL);
411 huc_info(huc, "initialization failed %pe\n", ERR_PTR(err));
415 void intel_huc_fini(struct intel_huc *huc)
418 * the fence is initialized in init_early, so we need to clean it up
419 * even if HuC loading is off.
421 delayed_huc_load_fini(huc);
424 i915_vma_unpin_and_release(&huc->heci_pkt, 0);
426 if (intel_uc_fw_is_loadable(&huc->fw))
427 intel_uc_fw_fini(&huc->fw);
430 void intel_huc_suspend(struct intel_huc *huc)
432 if (!intel_uc_fw_is_loadable(&huc->fw))
436 * in the unlikely case that we're suspending before the GSC has
437 * completed its loading sequence, just stop waiting. We'll restart
440 delayed_huc_load_complete(huc);
443 static const char *auth_mode_string(struct intel_huc *huc,
444 enum intel_huc_authentication_type type)
446 bool partial = huc->fw.has_gsc_headers && type == INTEL_HUC_AUTH_BY_GUC;
448 return partial ? "clear media" : "all workloads";
452 * Use a longer timeout for debug builds so that problems can be detected
453 * and analysed. But a shorter timeout for releases so that user's don't
454 * wait forever to find out there is a problem. Note that the only reason
455 * an end user should hit the timeout is in case of extreme thermal throttling.
456 * And a system that is that hot during boot is probably dead anyway!
458 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
459 #define HUC_LOAD_RETRY_LIMIT 20
461 #define HUC_LOAD_RETRY_LIMIT 3
464 int intel_huc_wait_for_auth_complete(struct intel_huc *huc,
465 enum intel_huc_authentication_type type)
467 struct intel_gt *gt = huc_to_gt(huc);
468 struct intel_uncore *uncore = gt->uncore;
469 ktime_t before, after, delta;
475 * The KMD requests maximum frequency during driver load, however thermal
476 * throttling can force the frequency down to minimum (although the board
477 * really should never get that hot in real life!). IFWI issues have been
478 * seen to cause sporadic failures to grant the higher frequency. And at
479 * minimum frequency, the authentication time can be in the seconds range.
480 * Note that there is a limit on how long an individual wait_for() can wait.
481 * So wrap it in a loop.
483 before_freq = intel_rps_read_actual_frequency(>->rps);
484 before = ktime_get();
485 for (count = 0; count < HUC_LOAD_RETRY_LIMIT; count++) {
486 ret = __intel_wait_for_register(gt->uncore,
487 huc->status[type].reg,
488 huc->status[type].mask,
489 huc->status[type].value,
494 huc_dbg(huc, "auth still in progress, count = %d, freq = %dMHz, status = 0x%08X\n",
495 count, intel_rps_read_actual_frequency(>->rps),
496 huc->status[type].reg.reg);
499 delta = ktime_sub(after, before);
500 delta_ms = ktime_to_ms(delta);
503 huc_warn(huc, "excessive auth time: %lldms! [status = 0x%08X, count = %d, ret = %d]\n",
504 delta_ms, huc->status[type].reg.reg, count, ret);
505 huc_warn(huc, "excessive auth time: [freq = %dMHz, before = %dMHz, perf_limit_reasons = 0x%08X]\n",
506 intel_rps_read_actual_frequency(>->rps), before_freq,
507 intel_uncore_read(uncore, intel_gt_perf_limit_reasons_reg(gt)));
509 huc_dbg(huc, "auth took %lldms, freq = %dMHz, before = %dMHz, status = 0x%08X, count = %d, ret = %d\n",
510 delta_ms, intel_rps_read_actual_frequency(>->rps),
511 before_freq, huc->status[type].reg.reg, count, ret);
514 /* mark the load process as complete even if the wait failed */
515 delayed_huc_load_complete(huc);
518 huc_err(huc, "firmware not verified for %s: %pe\n",
519 auth_mode_string(huc, type), ERR_PTR(ret));
520 intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_LOAD_FAIL);
524 intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_RUNNING);
525 huc_info(huc, "authenticated for %s\n", auth_mode_string(huc, type));
530 * intel_huc_auth() - Authenticate HuC uCode
531 * @huc: intel_huc structure
532 * @type: authentication type (via GuC or via GSC)
534 * Called after HuC and GuC firmware loading during intel_uc_init_hw().
536 * This function invokes the GuC action to authenticate the HuC firmware,
537 * passing the offset of the RSA signature to intel_guc_auth_huc(). It then
538 * waits for up to 50ms for firmware verification ACK.
540 int intel_huc_auth(struct intel_huc *huc, enum intel_huc_authentication_type type)
542 struct intel_gt *gt = huc_to_gt(huc);
543 struct intel_guc *guc = gt_to_guc(gt);
546 if (!intel_uc_fw_is_loaded(&huc->fw))
549 /* GSC will do the auth with the load */
550 if (intel_huc_is_loaded_by_gsc(huc))
553 if (intel_huc_is_authenticated(huc, type))
556 ret = i915_inject_probe_error(gt->i915, -ENXIO);
561 case INTEL_HUC_AUTH_BY_GUC:
562 ret = intel_guc_auth_huc(guc, intel_guc_ggtt_offset(guc, huc->fw.rsa_data));
564 case INTEL_HUC_AUTH_BY_GSC:
565 ret = intel_huc_fw_auth_via_gsccs(huc);
574 /* Check authentication status, it should be done by now */
575 ret = intel_huc_wait_for_auth_complete(huc, type);
582 huc_probe_error(huc, "%s authentication failed %pe\n",
583 auth_mode_string(huc, type), ERR_PTR(ret));
587 bool intel_huc_is_authenticated(struct intel_huc *huc,
588 enum intel_huc_authentication_type type)
590 struct intel_gt *gt = huc_to_gt(huc);
591 intel_wakeref_t wakeref;
594 with_intel_runtime_pm(gt->uncore->rpm, wakeref)
595 status = intel_uncore_read(gt->uncore, huc->status[type].reg);
597 return (status & huc->status[type].mask) == huc->status[type].value;
600 static bool huc_is_fully_authenticated(struct intel_huc *huc)
602 struct intel_uc_fw *huc_fw = &huc->fw;
604 if (!huc_fw->has_gsc_headers)
605 return intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GUC);
606 else if (intel_huc_is_loaded_by_gsc(huc) || HAS_ENGINE(huc_to_gt(huc), GSC0))
607 return intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC);
613 * intel_huc_check_status() - check HuC status
614 * @huc: intel_huc structure
616 * This function reads status register to verify if HuC
617 * firmware was successfully loaded.
619 * The return values match what is expected for the I915_PARAM_HUC_STATUS
622 int intel_huc_check_status(struct intel_huc *huc)
624 struct intel_uc_fw *huc_fw = &huc->fw;
626 switch (__intel_uc_fw_status(huc_fw)) {
627 case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
629 case INTEL_UC_FIRMWARE_DISABLED:
631 case INTEL_UC_FIRMWARE_MISSING:
633 case INTEL_UC_FIRMWARE_ERROR:
635 case INTEL_UC_FIRMWARE_INIT_FAIL:
637 case INTEL_UC_FIRMWARE_LOAD_FAIL:
644 * GSC-enabled binaries loaded via DMA are first partially
645 * authenticated by GuC and then fully authenticated by GSC
647 if (huc_is_fully_authenticated(huc))
648 return 1; /* full auth */
649 else if (huc_fw->has_gsc_headers && !intel_huc_is_loaded_by_gsc(huc) &&
650 intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GUC))
651 return 2; /* clear media only */
656 static bool huc_has_delayed_load(struct intel_huc *huc)
658 return intel_huc_is_loaded_by_gsc(huc) &&
659 (huc->delayed_load.status != INTEL_HUC_DELAYED_LOAD_ERROR);
662 void intel_huc_update_auth_status(struct intel_huc *huc)
664 if (!intel_uc_fw_is_loadable(&huc->fw))
667 if (!huc->fw.has_gsc_headers)
670 if (huc_is_fully_authenticated(huc))
671 intel_uc_fw_change_status(&huc->fw,
672 INTEL_UC_FIRMWARE_RUNNING);
673 else if (huc_has_delayed_load(huc))
674 huc_delayed_load_start(huc);
678 * intel_huc_load_status - dump information about HuC load status
680 * @p: the &drm_printer
682 * Pretty printer for HuC load status.
684 void intel_huc_load_status(struct intel_huc *huc, struct drm_printer *p)
686 struct intel_gt *gt = huc_to_gt(huc);
687 intel_wakeref_t wakeref;
689 if (!intel_huc_is_supported(huc)) {
690 drm_printf(p, "HuC not supported\n");
694 if (!intel_huc_is_wanted(huc)) {
695 drm_printf(p, "HuC disabled\n");
699 intel_uc_fw_dump(&huc->fw, p);
701 with_intel_runtime_pm(gt->uncore->rpm, wakeref)
702 drm_printf(p, "HuC status: 0x%08x\n",
703 intel_uncore_read(gt->uncore, huc->status[INTEL_HUC_AUTH_BY_GUC].reg));