20  * GSC proxy:
21  * The GSC uC needs to communicate with the CSME to perform certain operations.
22  * Since the GSC can't perform this communication directly on platforms where it
23  * is integrated in GT, i915 needs to transfer the messages from GSC to CSME
24  * and back. i915 must manually start the proxy flow after the GSC is loaded to
25  * signal to GSC that we're ready to handle its messages and allow it to query
26  * its init data from CSME; GSC will then trigger an HECI2 interrupt if it needs
29  * 1 - i915 submits a request to GSC asking for the message to CSME
30  * 2 - GSC replies with the proxy header + payload for CSME
31  * 3 - i915 sends the reply from GSC as-is to CSME via the mei proxy component
32  * 4 - CSME replies with the proxy header + payload for GSC
33  * 5 - i915 submits a request to GSC with the reply from CSME
34  * 6 - GSC replies either with a new header + payload (same as step 2, so we
84 static int proxy_send_to_csme(struct intel_gsc_uc *gsc)  in proxy_send_to_csme()  argument
86 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in proxy_send_to_csme()
87 	struct i915_gsc_proxy_component *comp = gsc->proxy.component;  in proxy_send_to_csme()
89 	void *in = gsc->proxy.to_csme;  in proxy_send_to_csme()
90 	void *out = gsc->proxy.to_gsc;  in proxy_send_to_csme()
123 static int proxy_send_to_gsc(struct intel_gsc_uc *gsc)  in proxy_send_to_gsc()  argument
125 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in proxy_send_to_gsc()
126 	u32 *marker = gsc->proxy.to_csme; /* first dw of the reply header */  in proxy_send_to_gsc()
127 	u64 addr_in = i915_ggtt_offset(gsc->proxy.vma);  in proxy_send_to_gsc()
129 	u32 size = ((struct gsc_proxy_msg *)gsc->proxy.to_gsc)->header.message_size;  in proxy_send_to_gsc()
132 	/* the message must contain at least the gsc and proxy headers */  in proxy_send_to_gsc()
134 		gt_err(gt, "Invalid GSC proxy message size: %u\n", size);  in proxy_send_to_gsc()
145 	err = intel_gsc_uc_heci_cmd_submit_packet(gsc, addr_in, size,  in proxy_send_to_gsc()
152 			gt_err(gt, "Failed to get a proxy reply from gsc\n");  in proxy_send_to_gsc()
186 static int proxy_query(struct intel_gsc_uc *gsc)  in proxy_query()  argument
188 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in proxy_query()
189 	struct gsc_proxy_msg *to_gsc = gsc->proxy.to_gsc;  in proxy_query()
190 	struct gsc_proxy_msg *to_csme = gsc->proxy.to_csme;  in proxy_query()
207 		/* clear the GSC response header space */  in proxy_query()
208 		memset(gsc->proxy.to_csme, 0, sizeof(struct gsc_proxy_msg));  in proxy_query()
210 		/* send proxy message to GSC */  in proxy_query()
211 		ret = proxy_send_to_gsc(gsc);  in proxy_query()
213 			gt_err(gt, "failed to send proxy message to GSC! %d\n", ret);  in proxy_query()
222 		/* make sure the GSC-to-CSME proxy header is sane */  in proxy_query()
227 			gt_err(gt, "invalid GSC to CSME proxy header! %d\n", ret);  in proxy_query()
231 		/* send the GSC message to the CSME */  in proxy_query()
232 		ret = proxy_send_to_csme(gsc);  in proxy_query()
238 		/* update the GSC message size with the returned value from CSME */  in proxy_query()
241 		/* make sure the CSME-to-GSC proxy header is sane */  in proxy_query()
246 			gt_err(gt, "invalid CSME to GSC proxy header! %d\n", ret);  in proxy_query()
255 int intel_gsc_proxy_request_handler(struct intel_gsc_uc *gsc)  in intel_gsc_proxy_request_handler()  argument
257 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in intel_gsc_proxy_request_handler()
260 	if (!gsc->proxy.component_added)  in intel_gsc_proxy_request_handler()
265 	/* when GSC is loaded, we can queue this before the component is bound */  in intel_gsc_proxy_request_handler()
266 	err = wait_for(gsc->proxy.component, GSC_PROXY_INIT_TIMEOUT_MS);  in intel_gsc_proxy_request_handler()
268 		gt_err(gt, "GSC proxy component didn't bind within the expected timeout\n");  in intel_gsc_proxy_request_handler()
272 	mutex_lock(&gsc->proxy.mutex);  in intel_gsc_proxy_request_handler()
273 	if (!gsc->proxy.component) {  in intel_gsc_proxy_request_handler()
274 		gt_err(gt, "GSC proxy worker called without the component being bound!\n");  in intel_gsc_proxy_request_handler()
284 		err = proxy_query(gsc);  in intel_gsc_proxy_request_handler()
286 	mutex_unlock(&gsc->proxy.mutex);  in intel_gsc_proxy_request_handler()
290 void intel_gsc_proxy_irq_handler(struct intel_gsc_uc *gsc, u32 iir)  in intel_gsc_proxy_irq_handler()  argument
292 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in intel_gsc_proxy_irq_handler()
299 	if (!gsc->proxy.component) {  in intel_gsc_proxy_irq_handler()
300 		gt_err(gt, "GSC proxy irq received without the component being bound!\n");  in intel_gsc_proxy_irq_handler()
304 	gsc->gsc_work_actions |= GSC_ACTION_SW_PROXY;  in intel_gsc_proxy_irq_handler()
305 	queue_work(gsc->wq, &gsc->work);  in intel_gsc_proxy_irq_handler()
313 	struct intel_gsc_uc *gsc = &gt->uc.gsc;  in i915_gsc_proxy_component_bind()  local
321 	mutex_lock(&gsc->proxy.mutex);  in i915_gsc_proxy_component_bind()
322 	gsc->proxy.component = data;  in i915_gsc_proxy_component_bind()
323 	gsc->proxy.component->mei_dev = mei_kdev;  in i915_gsc_proxy_component_bind()
324 	mutex_unlock(&gsc->proxy.mutex);  in i915_gsc_proxy_component_bind()
325 	gt_dbg(gt, "GSC proxy mei component bound\n");  in i915_gsc_proxy_component_bind()
335 	struct intel_gsc_uc *gsc = &gt->uc.gsc;  in i915_gsc_proxy_component_unbind()  local
338 	mutex_lock(&gsc->proxy.mutex);  in i915_gsc_proxy_component_unbind()
339 	gsc->proxy.component = NULL;  in i915_gsc_proxy_component_unbind()
340 	mutex_unlock(&gsc->proxy.mutex);  in i915_gsc_proxy_component_unbind()
346 	gt_dbg(gt, "GSC proxy mei component unbound\n");  in i915_gsc_proxy_component_unbind()
354 static int proxy_channel_alloc(struct intel_gsc_uc *gsc)  in proxy_channel_alloc()  argument
356 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in proxy_channel_alloc()
367 	gsc->proxy.vma = vma;  in proxy_channel_alloc()
368 	gsc->proxy.to_gsc = vaddr;  in proxy_channel_alloc()
369 	gsc->proxy.to_csme = vaddr + GSC_PROXY_BUFFER_SIZE;  in proxy_channel_alloc()
374 static void proxy_channel_free(struct intel_gsc_uc *gsc)  in proxy_channel_free()  argument
376 	if (!gsc->proxy.vma)  in proxy_channel_free()
379 	gsc->proxy.to_gsc = NULL;  in proxy_channel_free()
380 	gsc->proxy.to_csme = NULL;  in proxy_channel_free()
381 	i915_vma_unpin_and_release(&gsc->proxy.vma, I915_VMA_RELEASE_MAP);  in proxy_channel_free()
384 void intel_gsc_proxy_fini(struct intel_gsc_uc *gsc)  in intel_gsc_proxy_fini()  argument
386 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in intel_gsc_proxy_fini()
389 	if (fetch_and_zero(&gsc->proxy.component_added))  in intel_gsc_proxy_fini()
392 	proxy_channel_free(gsc);  in intel_gsc_proxy_fini()
395 int intel_gsc_proxy_init(struct intel_gsc_uc *gsc)  in intel_gsc_proxy_init()  argument
398 	struct intel_gt *gt = gsc_uc_to_gt(gsc);  in intel_gsc_proxy_init()
401 	mutex_init(&gsc->proxy.mutex);  in intel_gsc_proxy_init()
404 		gt_info(gt, "can't init GSC proxy due to missing mei component\n");  in intel_gsc_proxy_init()
408 	err = proxy_channel_alloc(gsc);  in intel_gsc_proxy_init()
419 	gsc->proxy.component_added = true;  in intel_gsc_proxy_init()
424 	proxy_channel_free(gsc);  in intel_gsc_proxy_init()