28  * GSC proxy:
32  * GSC to CSME and back. The proxy flow must be manually started after the GSC
36  * The proxy flow is as follow:
38  * 2 - GSC replies with the proxy header + payload for CSME
39  * 3 - Xe sends the reply from GSC as-is to CSME via the mei proxy component
40  * 4 - CSME replies with the proxy header + payload for GSC
101 	struct i915_gsc_proxy_component *comp = gsc->proxy.component;  in proxy_send_to_csme()
104 	ret = comp->ops->send(comp->mei_dev, gsc->proxy.to_csme, size);  in proxy_send_to_csme()
106 		xe_gt_err(gt, "Failed to send CSME proxy message\n");  in proxy_send_to_csme()
110 	ret = comp->ops->recv(comp->mei_dev, gsc->proxy.from_csme, GSC_PROXY_BUFFER_SIZE);  in proxy_send_to_csme()
112 		xe_gt_err(gt, "Failed to receive CSME proxy message\n");  in proxy_send_to_csme()
122 	u64 addr_in = xe_bo_ggtt_addr(gsc->proxy.bo);  in proxy_send_to_gsc()
126 	/* the message must contain at least the gsc and proxy headers */  in proxy_send_to_gsc()
128 		xe_gt_err(gt, "Invalid GSC proxy message size: %u\n", size);  in proxy_send_to_gsc()
135 		xe_gt_err(gt, "Failed to submit gsc proxy rq (%pe)\n", ERR_PTR(err));  in proxy_send_to_gsc()
181 			  "GSC proxy error: s=0x%x[0x%x], d=0x%x[0x%x], t=%u, l=0x%x, st=0x%x\n",  in validate_proxy_header()
213 	struct xe_gsc_proxy_header *to_csme_hdr = gsc->proxy.to_csme;  in proxy_query()
214 	void *to_csme_payload = gsc->proxy.to_csme + PROXY_HDR_SIZE;  in proxy_query()
220 	wr_offset = xe_gsc_emit_header(xe, &gsc->proxy.to_gsc, 0,  in proxy_query()
222 	wr_offset = emit_proxy_header(xe, &gsc->proxy.to_gsc, wr_offset);  in proxy_query()
231 		xe_gsc_poison_header(xe, &gsc->proxy.from_gsc, 0);  in proxy_query()
233 		/* send proxy message to GSC */  in proxy_query()
239 		ret = xe_gsc_read_out_header(xe, &gsc->proxy.from_gsc, 0,  in proxy_query()
242 			xe_gt_err(gt, "Invalid gsc header in proxy reply (%pe)\n",  in proxy_query()
247 		/* copy the proxy header reply from GSC */  in proxy_query()
248 		xe_map_memcpy_from(xe, to_csme_hdr, &gsc->proxy.from_gsc,  in proxy_query()
260 		/* make sure the GSC-to-CSME proxy header is sane */  in proxy_query()
266 			xe_gt_err(gt, "invalid GSC to CSME proxy header! (%pe)\n",  in proxy_query()
273 		xe_map_memcpy_from(xe, to_csme_payload, &gsc->proxy.from_gsc,  in proxy_query()
281 		/* reply size from CSME, including the proxy header */  in proxy_query()
284 			xe_gt_err(gt, "CSME to GSC proxy msg too small: 0x%x\n", size);  in proxy_query()
289 		/* make sure the CSME-to-GSC proxy header is sane */  in proxy_query()
290 		ret = validate_proxy_header(gt, gsc->proxy.from_csme,  in proxy_query()
295 			xe_gt_err(gt, "invalid CSME to GSC proxy header! %d\n", ret);  in proxy_query()
300 		wr_offset = xe_gsc_emit_header(xe, &gsc->proxy.to_gsc, 0,  in proxy_query()
304 		xe_map_memcpy_to(xe, &gsc->proxy.to_gsc, wr_offset, gsc->proxy.from_csme, size);  in proxy_query()
319 	if (!gsc->proxy.component_added)  in xe_gsc_proxy_request_handler()
324 		if (gsc->proxy.component)  in xe_gsc_proxy_request_handler()
330 	mutex_lock(&gsc->proxy.mutex);  in xe_gsc_proxy_request_handler()
331 	if (!gsc->proxy.component) {  in xe_gsc_proxy_request_handler()
332 		xe_gt_err(gt, "GSC proxy component not bound!\n");  in xe_gsc_proxy_request_handler()
336 		 * clear the pending interrupt and allow new proxy requests to  in xe_gsc_proxy_request_handler()
342 	mutex_unlock(&gsc->proxy.mutex);  in xe_gsc_proxy_request_handler()
353 	if (!gsc->proxy.component) {  in xe_gsc_proxy_irq_handler()
354 		xe_gt_err(gt, "GSC proxy irq received without the component being bound!\n");  in xe_gsc_proxy_irq_handler()
372 	mutex_lock(&gsc->proxy.mutex);  in xe_gsc_proxy_component_bind()
373 	gsc->proxy.component = data;  in xe_gsc_proxy_component_bind()
374 	gsc->proxy.component->mei_dev = mei_kdev;  in xe_gsc_proxy_component_bind()
375 	mutex_unlock(&gsc->proxy.mutex);  in xe_gsc_proxy_component_bind()
389 	mutex_lock(&gsc->proxy.mutex);  in xe_gsc_proxy_component_unbind()
390 	gsc->proxy.component = NULL;  in xe_gsc_proxy_component_unbind()
391 	mutex_unlock(&gsc->proxy.mutex);  in xe_gsc_proxy_component_unbind()
417 	gsc->proxy.bo = bo;  in proxy_channel_alloc()
418 	gsc->proxy.to_gsc = IOSYS_MAP_INIT_OFFSET(&bo->vmap, 0);  in proxy_channel_alloc()
419 	gsc->proxy.from_gsc = IOSYS_MAP_INIT_OFFSET(&bo->vmap, GSC_PROXY_BUFFER_SIZE);  in proxy_channel_alloc()
420 	gsc->proxy.to_csme = csme;  in proxy_channel_alloc()
421 	gsc->proxy.from_csme = csme + GSC_PROXY_BUFFER_SIZE;  in proxy_channel_alloc()
427  * xe_gsc_proxy_init() - init objects and MEI component required by GSC proxy
439 	mutex_init(&gsc->proxy.mutex);  in xe_gsc_proxy_init()
442 		xe_gt_info(gt, "can't init GSC proxy due to missing mei component\n");  in xe_gsc_proxy_init()
448 		xe_gt_err(gt, "unexpected GSC proxy init on tile %u\n", tile->id);  in xe_gsc_proxy_init()
463 	gsc->proxy.component_added = true;  in xe_gsc_proxy_init()
471  * xe_gsc_proxy_remove() - remove the GSC proxy MEI component
480 	if (!gsc->proxy.component_added)  in xe_gsc_proxy_remove()
498 	gsc->proxy.component_added = false;  in xe_gsc_proxy_remove()
502  * xe_gsc_proxy_start() - start the proxy by submitting the first request
505  * Return: 0 if the proxy are now enabled, a negative errno otherwise.
511 	/* enable the proxy interrupt in the GSC shim layer */  in xe_gsc_proxy_start()
515 	 * The handling of the first proxy request must be manually triggered to  in xe_gsc_proxy_start()
516 	 * notify the GSC that we're ready to support the proxy flow.  in xe_gsc_proxy_start()
523 		xe_gt_err(gsc_to_gt(gsc), "GSC FW reports proxy init not completed\n");  in xe_gsc_proxy_start()