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[J-linux.git] / drivers / gpu / drm / i915 / gt / uc / intel_gsc_uc.c
1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2022 Intel Corporation
4  */
5
6 #include <linux/types.h>
7
8 #include "gt/intel_gt.h"
9 #include "gt/intel_gt_print.h"
10 #include "intel_gsc_fw.h"
11 #include "intel_gsc_proxy.h"
12 #include "intel_gsc_uc.h"
13 #include "i915_drv.h"
14 #include "i915_reg.h"
15
16 static void gsc_work(struct work_struct *work)
17 {
18         struct intel_gsc_uc *gsc = container_of(work, typeof(*gsc), work);
19         struct intel_gt *gt = gsc_uc_to_gt(gsc);
20         intel_wakeref_t wakeref;
21         u32 actions;
22         int ret;
23
24         wakeref = intel_runtime_pm_get(gt->uncore->rpm);
25
26         spin_lock_irq(gt->irq_lock);
27         actions = gsc->gsc_work_actions;
28         gsc->gsc_work_actions = 0;
29         spin_unlock_irq(gt->irq_lock);
30
31         if (actions & GSC_ACTION_FW_LOAD) {
32                 ret = intel_gsc_uc_fw_upload(gsc);
33                 if (!ret)
34                         /* setup proxy on a new load */
35                         actions |= GSC_ACTION_SW_PROXY;
36                 else if (ret != -EEXIST)
37                         goto out_put;
38
39                 /*
40                  * The HuC auth can be done both before or after the proxy init;
41                  * if done after, a proxy request will be issued and must be
42                  * serviced before the authentication can complete.
43                  * Since this worker also handles proxy requests, we can't
44                  * perform an action that requires the proxy from within it and
45                  * then stall waiting for it, because we'd be blocking the
46                  * service path. Therefore, it is easier for us to load HuC
47                  * first and do proxy later. The GSC will ack the HuC auth and
48                  * then send the HuC proxy request as part of the proxy init
49                  * flow.
50                  * Note that we can only do the GSC auth if the GuC auth was
51                  * successful.
52                  */
53                 if (intel_uc_uses_huc(&gt->uc) &&
54                     intel_huc_is_authenticated(&gt->uc.huc, INTEL_HUC_AUTH_BY_GUC))
55                         intel_huc_auth(&gt->uc.huc, INTEL_HUC_AUTH_BY_GSC);
56         }
57
58         if (actions & GSC_ACTION_SW_PROXY) {
59                 if (!intel_gsc_uc_fw_init_done(gsc)) {
60                         gt_err(gt, "Proxy request received with GSC not loaded!\n");
61                         goto out_put;
62                 }
63
64                 ret = intel_gsc_proxy_request_handler(gsc);
65                 if (ret) {
66                         if (actions & GSC_ACTION_FW_LOAD) {
67                                 /*
68                                  * A proxy failure right after firmware load means the proxy-init
69                                  * step has failed so mark GSC as not usable after this
70                                  */
71                                 gt_err(gt, "GSC proxy handler failed to init\n");
72                                 intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_LOAD_FAIL);
73                         }
74                         goto out_put;
75                 }
76
77                 /* mark the GSC FW init as done the first time we run this */
78                 if (actions & GSC_ACTION_FW_LOAD) {
79                         /*
80                          * If there is a proxy establishment error, the GSC might still
81                          * complete the request handling cleanly, so we need to check the
82                          * status register to check if the proxy init was actually successful
83                          */
84                         if (intel_gsc_uc_fw_proxy_init_done(gsc, false)) {
85                                 gt_dbg(gt, "GSC Proxy initialized\n");
86                                 intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_RUNNING);
87                         } else {
88                                 gt_err(gt, "GSC status reports proxy init not complete\n");
89                                 intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_LOAD_FAIL);
90                         }
91                 }
92         }
93
94 out_put:
95         intel_runtime_pm_put(gt->uncore->rpm, wakeref);
96 }
97
98 static bool gsc_engine_supported(struct intel_gt *gt)
99 {
100         intel_engine_mask_t mask;
101
102         /*
103          * We reach here from i915_driver_early_probe for the primary GT before
104          * its engine mask is set, so we use the device info engine mask for it.
105          * For other GTs we expect the GT-specific mask to be set before we
106          * call this function.
107          */
108         GEM_BUG_ON(!gt_is_root(gt) && !gt->info.engine_mask);
109
110         if (gt_is_root(gt))
111                 mask = INTEL_INFO(gt->i915)->platform_engine_mask;
112         else
113                 mask = gt->info.engine_mask;
114
115         return __HAS_ENGINE(mask, GSC0);
116 }
117
118 void intel_gsc_uc_init_early(struct intel_gsc_uc *gsc)
119 {
120         struct intel_gt *gt = gsc_uc_to_gt(gsc);
121
122         /*
123          * GSC FW needs to be copied to a dedicated memory allocations for
124          * loading (see gsc->local), so we don't need to GGTT map the FW image
125          * itself into GGTT.
126          */
127         intel_uc_fw_init_early(&gsc->fw, INTEL_UC_FW_TYPE_GSC, false);
128         INIT_WORK(&gsc->work, gsc_work);
129
130         /* we can arrive here from i915_driver_early_probe for primary
131          * GT with it being not fully setup hence check device info's
132          * engine mask
133          */
134         if (!gsc_engine_supported(gt)) {
135                 intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_NOT_SUPPORTED);
136                 return;
137         }
138
139         gsc->wq = alloc_ordered_workqueue("i915_gsc", 0);
140         if (!gsc->wq) {
141                 gt_err(gt, "failed to allocate WQ for GSC, disabling FW\n");
142                 intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_NOT_SUPPORTED);
143         }
144 }
145
146 static int gsc_allocate_and_map_vma(struct intel_gsc_uc *gsc, u32 size)
147 {
148         struct intel_gt *gt = gsc_uc_to_gt(gsc);
149         struct drm_i915_gem_object *obj;
150         struct i915_vma *vma;
151         void __iomem *vaddr;
152         int ret = 0;
153
154         /*
155          * The GSC FW doesn't immediately suspend after becoming idle, so there
156          * is a chance that it could still be awake after we successfully
157          * return from the  pci suspend function, even if there are no pending
158          * operations.
159          * The FW might therefore try to access memory for its suspend operation
160          * after the kernel has completed the HW suspend flow; this can cause
161          * issues if the FW is mapped in normal RAM memory, as some of the
162          * involved HW units might've already lost power.
163          * The driver must therefore avoid this situation and the recommended
164          * way to do so is to use stolen memory for the GSC memory allocation,
165          * because stolen memory takes a different path in HW and it is
166          * guaranteed to always work as long as the GPU itself is awake (which
167          * it must be if the GSC is awake).
168          */
169         obj = i915_gem_object_create_stolen(gt->i915, size);
170         if (IS_ERR(obj))
171                 return PTR_ERR(obj);
172
173         vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
174         if (IS_ERR(vma)) {
175                 ret = PTR_ERR(vma);
176                 goto err;
177         }
178
179         vaddr = i915_vma_pin_iomap(vma);
180         i915_vma_unpin(vma);
181         if (IS_ERR(vaddr)) {
182                 ret = PTR_ERR(vaddr);
183                 goto err;
184         }
185
186         i915_vma_make_unshrinkable(vma);
187
188         gsc->local = vma;
189         gsc->local_vaddr = vaddr;
190
191         return 0;
192
193 err:
194         i915_gem_object_put(obj);
195         return ret;
196 }
197
198 static void gsc_unmap_and_free_vma(struct intel_gsc_uc *gsc)
199 {
200         struct i915_vma *vma = fetch_and_zero(&gsc->local);
201
202         if (!vma)
203                 return;
204
205         gsc->local_vaddr = NULL;
206         i915_vma_unpin_iomap(vma);
207         i915_gem_object_put(vma->obj);
208 }
209
210 int intel_gsc_uc_init(struct intel_gsc_uc *gsc)
211 {
212         static struct lock_class_key gsc_lock;
213         struct intel_gt *gt = gsc_uc_to_gt(gsc);
214         struct intel_engine_cs *engine = gt->engine[GSC0];
215         struct intel_context *ce;
216         int err;
217
218         err = intel_uc_fw_init(&gsc->fw);
219         if (err)
220                 goto out;
221
222         err = gsc_allocate_and_map_vma(gsc, SZ_4M);
223         if (err)
224                 goto out_fw;
225
226         ce = intel_engine_create_pinned_context(engine, engine->gt->vm, SZ_4K,
227                                                 I915_GEM_HWS_GSC_ADDR,
228                                                 &gsc_lock, "gsc_context");
229         if (IS_ERR(ce)) {
230                 gt_err(gt, "failed to create GSC CS ctx for FW communication\n");
231                 err =  PTR_ERR(ce);
232                 goto out_vma;
233         }
234
235         gsc->ce = ce;
236
237         /* if we fail to init proxy we still want to load GSC for PM */
238         intel_gsc_proxy_init(gsc);
239
240         intel_uc_fw_change_status(&gsc->fw, INTEL_UC_FIRMWARE_LOADABLE);
241
242         return 0;
243
244 out_vma:
245         gsc_unmap_and_free_vma(gsc);
246 out_fw:
247         intel_uc_fw_fini(&gsc->fw);
248 out:
249         gt_probe_error(gt, "GSC init failed %pe\n", ERR_PTR(err));
250         return err;
251 }
252
253 void intel_gsc_uc_fini(struct intel_gsc_uc *gsc)
254 {
255         if (!intel_uc_fw_is_loadable(&gsc->fw))
256                 return;
257
258         flush_work(&gsc->work);
259         if (gsc->wq) {
260                 destroy_workqueue(gsc->wq);
261                 gsc->wq = NULL;
262         }
263
264         intel_gsc_proxy_fini(gsc);
265
266         if (gsc->ce)
267                 intel_engine_destroy_pinned_context(fetch_and_zero(&gsc->ce));
268
269         gsc_unmap_and_free_vma(gsc);
270
271         intel_uc_fw_fini(&gsc->fw);
272 }
273
274 void intel_gsc_uc_flush_work(struct intel_gsc_uc *gsc)
275 {
276         if (!intel_uc_fw_is_loadable(&gsc->fw))
277                 return;
278
279         flush_work(&gsc->work);
280 }
281
282 void intel_gsc_uc_resume(struct intel_gsc_uc *gsc)
283 {
284         if (!intel_uc_fw_is_loadable(&gsc->fw))
285                 return;
286
287         /*
288          * we only want to start the GSC worker from here in the actual resume
289          * flow and not during driver load. This is because GSC load is slow and
290          * therefore we want to make sure that the default state init completes
291          * first to not slow down the init thread. A separate call to
292          * intel_gsc_uc_load_start will ensure that the GSC is loaded during
293          * driver load.
294          */
295         if (!gsc_uc_to_gt(gsc)->engine[GSC0]->default_state)
296                 return;
297
298         intel_gsc_uc_load_start(gsc);
299 }
300
301 void intel_gsc_uc_load_start(struct intel_gsc_uc *gsc)
302 {
303         struct intel_gt *gt = gsc_uc_to_gt(gsc);
304
305         if (!intel_uc_fw_is_loadable(&gsc->fw))
306                 return;
307
308         if (intel_gsc_uc_fw_init_done(gsc))
309                 return;
310
311         spin_lock_irq(gt->irq_lock);
312         gsc->gsc_work_actions |= GSC_ACTION_FW_LOAD;
313         spin_unlock_irq(gt->irq_lock);
314
315         queue_work(gsc->wq, &gsc->work);
316 }
317
318 void intel_gsc_uc_load_status(struct intel_gsc_uc *gsc, struct drm_printer *p)
319 {
320         struct intel_gt *gt = gsc_uc_to_gt(gsc);
321         struct intel_uncore *uncore = gt->uncore;
322         intel_wakeref_t wakeref;
323
324         if (!intel_gsc_uc_is_supported(gsc)) {
325                 drm_printf(p, "GSC not supported\n");
326                 return;
327         }
328
329         if (!intel_gsc_uc_is_wanted(gsc)) {
330                 drm_printf(p, "GSC disabled\n");
331                 return;
332         }
333
334         drm_printf(p, "GSC firmware: %s\n", gsc->fw.file_selected.path);
335         if (gsc->fw.file_selected.path != gsc->fw.file_wanted.path)
336                 drm_printf(p, "GSC firmware wanted: %s\n", gsc->fw.file_wanted.path);
337         drm_printf(p, "\tstatus: %s\n", intel_uc_fw_status_repr(gsc->fw.status));
338
339         drm_printf(p, "Release: %u.%u.%u.%u\n",
340                    gsc->release.major, gsc->release.minor,
341                    gsc->release.patch, gsc->release.build);
342
343         drm_printf(p, "Compatibility Version: %u.%u [min expected %u.%u]\n",
344                    gsc->fw.file_selected.ver.major, gsc->fw.file_selected.ver.minor,
345                    gsc->fw.file_wanted.ver.major, gsc->fw.file_wanted.ver.minor);
346
347         drm_printf(p, "SVN: %u\n", gsc->security_version);
348
349         with_intel_runtime_pm(uncore->rpm, wakeref) {
350                 u32 i;
351
352                 for (i = 1; i <= 6; i++) {
353                         u32 status = intel_uncore_read(uncore,
354                                                        HECI_FWSTS(MTL_GSC_HECI1_BASE, i));
355                         drm_printf(p, "HECI1 FWSTST%u = 0x%08x\n", i, status);
356                 }
357         }
358 }
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