20  * GSC proxy:
24  * and back. i915 must manually start the proxy flow after the GSC is loaded to
28  * The proxy flow is as follow:
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
49 /* FW-defined proxy header */
53 	 * Bits 0-7: type of the proxy message (see enum intel_gsc_proxy_type)
55 	 * Bits 16-31: length in bytes of the payload following the proxy header
61 	u32 source;		/* Source of the Proxy message */
62 	u32 destination;	/* Destination of the Proxy message */
70 /* FW-defined proxy types */
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()
94 	/* CSME msg only includes the proxy */  in proxy_send_to_csme()
101 	/* the message must contain at least the proxy header */  in proxy_send_to_csme()
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()
152 			gt_err(gt, "Failed to get a proxy reply from gsc\n");  in proxy_send_to_gsc()
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()
208 		memset(gsc->proxy.to_csme, 0, sizeof(struct gsc_proxy_msg));  in proxy_query()
210 		/* send proxy message to 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()
234 			gt_err(gt, "failed to send proxy message to CSME! %d\n", ret);  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()
260 	if (!gsc->proxy.component_added)  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()
278 		 * write the status bit to clear it and allow new proxy  in intel_gsc_proxy_request_handler()
286 	mutex_unlock(&gsc->proxy.mutex);  in intel_gsc_proxy_request_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()
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()
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()
366 	gsc->proxy.vma = vma;  in proxy_channel_alloc()
367 	gsc->proxy.to_gsc = vaddr;  in proxy_channel_alloc()
368 	gsc->proxy.to_csme = vaddr + GSC_PROXY_BUFFER_SIZE;  in proxy_channel_alloc()
375 	if (!gsc->proxy.vma)  in proxy_channel_free()
378 	gsc->proxy.to_gsc = NULL;  in proxy_channel_free()
379 	gsc->proxy.to_csme = NULL;  in proxy_channel_free()
380 	i915_vma_unpin_and_release(&gsc->proxy.vma, I915_VMA_RELEASE_MAP);  in proxy_channel_free()
388 	if (fetch_and_zero(&gsc->proxy.component_added))  in intel_gsc_proxy_fini()
400 	mutex_init(&gsc->proxy.mutex);  in intel_gsc_proxy_init()
403 		gt_info(gt, "can't init GSC proxy due to missing mei component\n");  in intel_gsc_proxy_init()
418 	gsc->proxy.component_added = true;  in intel_gsc_proxy_init()