drm/xe/xe_gsc_proxy.c

29  * GSC proxy:
33  * GSC to CSME and back. The proxy flow must be manually started after the GSC
37  * The proxy flow is as follow:
39  * 2 - GSC replies with the proxy header + payload for CSME
40  * 3 - Xe sends the reply from GSC as-is to CSME via the mei proxy component
41  * 4 - CSME replies with the proxy header + payload for GSC
113 	struct i915_gsc_proxy_component *comp = gsc->proxy.component;
116 	ret = comp->ops->send(comp->mei_dev, gsc->proxy.to_csme, size);
118 		xe_gt_err(gt, "Failed to send CSME proxy message\n");
122 	ret = comp->ops->recv(comp->mei_dev, gsc->proxy.from_csme, GSC_PROXY_BUFFER_SIZE);
124 		xe_gt_err(gt, "Failed to receive CSME proxy message\n");
134 	u64 addr_in = xe_bo_ggtt_addr(gsc->proxy.bo);
138 	/* the message must contain at least the gsc and proxy headers */
140 		xe_gt_err(gt, "Invalid GSC proxy message size: %u\n", size);
147 		xe_gt_err(gt, "Failed to submit gsc proxy rq (%pe)\n", ERR_PTR(err));
193 			  "GSC proxy error: s=0x%x[0x%x], d=0x%x[0x%x], t=%u, l=0x%x, st=0x%x\n",
225 	struct xe_gsc_proxy_header *to_csme_hdr = gsc->proxy.to_csme;
226 	void *to_csme_payload = gsc->proxy.to_csme + PROXY_HDR_SIZE;
232 	wr_offset = xe_gsc_emit_header(xe, &gsc->proxy.to_gsc, 0,
234 	wr_offset = emit_proxy_header(xe, &gsc->proxy.to_gsc, wr_offset);
243 		xe_gsc_poison_header(xe, &gsc->proxy.from_gsc, 0);
245 		/* send proxy message to GSC */
251 		ret = xe_gsc_read_out_header(xe, &gsc->proxy.from_gsc, 0,
254 			xe_gt_err(gt, "Invalid gsc header in proxy reply (%pe)\n",
259 		/* copy the proxy header reply from GSC */
260 		xe_map_memcpy_from(xe, to_csme_hdr, &gsc->proxy.from_gsc,
272 		/* make sure the GSC-to-CSME proxy header is sane */
278 			xe_gt_err(gt, "invalid GSC to CSME proxy header! (%pe)\n",
285 		xe_map_memcpy_from(xe, to_csme_payload, &gsc->proxy.from_gsc,
293 		/* reply size from CSME, including the proxy header */
296 			xe_gt_err(gt, "CSME to GSC proxy msg too small: 0x%x\n", size);
301 		/* make sure the CSME-to-GSC proxy header is sane */
302 		ret = validate_proxy_header(gt, gsc->proxy.from_csme,
307 			xe_gt_err(gt, "invalid CSME to GSC proxy header! %d\n", ret);
312 		wr_offset = xe_gsc_emit_header(xe, &gsc->proxy.to_gsc, 0,
316 		xe_map_memcpy_to(xe, &gsc->proxy.to_gsc, wr_offset, gsc->proxy.from_csme, size);
331 	if (!gsc->proxy.component_added)
336 		if (gsc->proxy.component)
342 	mutex_lock(&gsc->proxy.mutex);
343 	if (!gsc->proxy.component) {
344 		xe_gt_err(gt, "GSC proxy component not bound!\n");
348 		 * clear the pending interrupt and allow new proxy requests to
354 	mutex_unlock(&gsc->proxy.mutex);
365 	if (!gsc->proxy.component) {
366 		xe_gt_err(gt, "GSC proxy irq received without the component being bound!\n");
384 	mutex_lock(&gsc->proxy.mutex);
385 	gsc->proxy.component = data;
386 	gsc->proxy.component->mei_dev = mei_kdev;
387 	mutex_unlock(&gsc->proxy.mutex);
401 	mutex_lock(&gsc->proxy.mutex);
402 	gsc->proxy.component = NULL;
403 	mutex_unlock(&gsc->proxy.mutex);
429 	gsc->proxy.bo = bo;
430 	gsc->proxy.to_gsc = IOSYS_MAP_INIT_OFFSET(&bo->vmap, 0);
431 	gsc->proxy.from_gsc = IOSYS_MAP_INIT_OFFSET(&bo->vmap, GSC_PROXY_BUFFER_SIZE);
432 	gsc->proxy.to_csme = csme;
433 	gsc->proxy.from_csme = csme + GSC_PROXY_BUFFER_SIZE;
445 	if (!gsc->proxy.component_added)
463 	gsc->proxy.component_added = false;
467  * xe_gsc_proxy_init() - init objects and MEI component required by GSC proxy
479 	mutex_init(&gsc->proxy.mutex);
482 		xe_gt_info(gt, "can't init GSC proxy due to missing mei component\n");
488 		xe_gt_err(gt, "unexpected GSC proxy init on tile %u\n", tile->id);
503 	gsc->proxy.component_added = true;
509  * xe_gsc_proxy_start() - start the proxy by submitting the first request
512  * Return: 0 if the proxy are now enabled, a negative errno otherwise.
518 	/* enable the proxy interrupt in the GSC shim layer */
522 	 * The handling of the first proxy request must be manually triggered to
523 	 * notify the GSC that we're ready to support the proxy flow.
530 		xe_gt_err(gsc_to_gt(gsc), "GSC FW reports proxy init not completed\n");