118 	void (*update_entry)(grant_ref_t ref, domid_t domid,
128 	int (*end_foreign_access_ref)(grant_ref_t ref, int readonly);
136 	unsigned long (*end_foreign_transfer_ref)(grant_ref_t ref);
143 	int (*query_foreign_access)(grant_ref_t ref);
173 	int ref, rc = 0;  in get_free_entries()  local
184 	ref = head = gnttab_free_head;  in get_free_entries()
193 	return ref;  in get_free_entries()
222 static void put_free_entry(grant_ref_t ref)  in put_free_entry()  argument
226 	gnttab_entry(ref) = gnttab_free_head;  in put_free_entry()
227 	gnttab_free_head = ref;  in put_free_entry()
244 static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid,  in gnttab_update_entry_v1()  argument
247 	gnttab_shared.v1[ref].domid = domid;  in gnttab_update_entry_v1()
248 	gnttab_shared.v1[ref].frame = frame;  in gnttab_update_entry_v1()
250 	gnttab_shared.v1[ref].flags = flags;  in gnttab_update_entry_v1()
253 static void gnttab_update_entry_v2(grant_ref_t ref, domid_t domid,  in gnttab_update_entry_v2()  argument
256 	gnttab_shared.v2[ref].hdr.domid = domid;  in gnttab_update_entry_v2()
257 	gnttab_shared.v2[ref].full_page.frame = frame;  in gnttab_update_entry_v2()
259 	gnttab_shared.v2[ref].hdr.flags = GTF_permit_access | flags;  in gnttab_update_entry_v2()
265 void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,  in gnttab_grant_foreign_access_ref()  argument
268 	gnttab_interface->update_entry(ref, domid, frame,  in gnttab_grant_foreign_access_ref()
276 	int ref;  in gnttab_grant_foreign_access()  local
278 	ref = get_free_entries(1);  in gnttab_grant_foreign_access()
279 	if (unlikely(ref < 0))  in gnttab_grant_foreign_access()
282 	gnttab_grant_foreign_access_ref(ref, domid, frame, readonly);  in gnttab_grant_foreign_access()
284 	return ref;  in gnttab_grant_foreign_access()
288 static int gnttab_query_foreign_access_v1(grant_ref_t ref)  in gnttab_query_foreign_access_v1()  argument
290 	return gnttab_shared.v1[ref].flags & (GTF_reading|GTF_writing);  in gnttab_query_foreign_access_v1()
293 static int gnttab_query_foreign_access_v2(grant_ref_t ref)  in gnttab_query_foreign_access_v2()  argument
295 	return grstatus[ref] & (GTF_reading|GTF_writing);  in gnttab_query_foreign_access_v2()
298 int gnttab_query_foreign_access(grant_ref_t ref)  in gnttab_query_foreign_access()  argument
300 	return gnttab_interface->query_foreign_access(ref);  in gnttab_query_foreign_access()
304 static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref, int readonly)  in gnttab_end_foreign_access_ref_v1()  argument
309 	pflags = &gnttab_shared.v1[ref].flags;  in gnttab_end_foreign_access_ref_v1()
320 static int gnttab_end_foreign_access_ref_v2(grant_ref_t ref, int readonly)  in gnttab_end_foreign_access_ref_v2()  argument
322 	gnttab_shared.v2[ref].hdr.flags = 0;  in gnttab_end_foreign_access_ref_v2()
324 	if (grstatus[ref] & (GTF_reading|GTF_writing)) {  in gnttab_end_foreign_access_ref_v2()
343 static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)  in _gnttab_end_foreign_access_ref()  argument
345 	return gnttab_interface->end_foreign_access_ref(ref, readonly);  in _gnttab_end_foreign_access_ref()
348 int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly)  in gnttab_end_foreign_access_ref()  argument
350 	if (_gnttab_end_foreign_access_ref(ref, readonly))  in gnttab_end_foreign_access_ref()
352 	pr_warn("WARNING: g.e. %#x still in use!\n", ref);  in gnttab_end_foreign_access_ref()
359 	grant_ref_t ref;  member
384 		if (_gnttab_end_foreign_access_ref(entry->ref, entry->ro)) {  in gnttab_handle_deferred()
385 			put_free_entry(entry->ref);  in gnttab_handle_deferred()
388 					 entry->ref, page_to_pfn(entry->page));  in gnttab_handle_deferred()
391 				pr_info("freeing g.e. %#x\n", entry->ref);  in gnttab_handle_deferred()
396 				pr_info("g.e. %#x still pending\n", entry->ref);  in gnttab_handle_deferred()
413 static void gnttab_add_deferred(grant_ref_t ref, bool readonly,  in gnttab_add_deferred()  argument
422 		entry->ref = ref;  in gnttab_add_deferred()
436 	       what, ref, page ? page_to_pfn(page) : -1);  in gnttab_add_deferred()
439 void gnttab_end_foreign_access(grant_ref_t ref, int readonly,  in gnttab_end_foreign_access()  argument
442 	if (gnttab_end_foreign_access_ref(ref, readonly)) {  in gnttab_end_foreign_access()
443 		put_free_entry(ref);  in gnttab_end_foreign_access()
447 		gnttab_add_deferred(ref, readonly,  in gnttab_end_foreign_access()
454 	int ref;  in gnttab_grant_foreign_transfer()  local
456 	ref = get_free_entries(1);  in gnttab_grant_foreign_transfer()
457 	if (unlikely(ref < 0))  in gnttab_grant_foreign_transfer()
459 	gnttab_grant_foreign_transfer_ref(ref, domid, pfn);  in gnttab_grant_foreign_transfer()
461 	return ref;  in gnttab_grant_foreign_transfer()
465 void gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid,  in gnttab_grant_foreign_transfer_ref()  argument
468 	gnttab_interface->update_entry(ref, domid, pfn, GTF_accept_transfer);  in gnttab_grant_foreign_transfer_ref()
472 static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref)  in gnttab_end_foreign_transfer_ref_v1()  argument
478 	pflags = &gnttab_shared.v1[ref].flags;  in gnttab_end_foreign_transfer_ref_v1()
497 	frame = gnttab_shared.v1[ref].frame;  in gnttab_end_foreign_transfer_ref_v1()
503 static unsigned long gnttab_end_foreign_transfer_ref_v2(grant_ref_t ref)  in gnttab_end_foreign_transfer_ref_v2()  argument
509 	pflags = &gnttab_shared.v2[ref].hdr.flags;  in gnttab_end_foreign_transfer_ref_v2()
528 	frame = gnttab_shared.v2[ref].full_page.frame;  in gnttab_end_foreign_transfer_ref_v2()
534 unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref)  in gnttab_end_foreign_transfer_ref()  argument
536 	return gnttab_interface->end_foreign_transfer_ref(ref);  in gnttab_end_foreign_transfer_ref()
540 unsigned long gnttab_end_foreign_transfer(grant_ref_t ref)  in gnttab_end_foreign_transfer()  argument
542 	unsigned long frame = gnttab_end_foreign_transfer_ref(ref);  in gnttab_end_foreign_transfer()
543 	put_free_entry(ref);  in gnttab_end_foreign_transfer()
548 void gnttab_free_grant_reference(grant_ref_t ref)  in gnttab_free_grant_reference()  argument
550 	put_free_entry(ref);  in gnttab_free_grant_reference()
556 	grant_ref_t ref;  in gnttab_free_grant_references()  local
562 	ref = head;  in gnttab_free_grant_references()
563 	while (gnttab_entry(ref) != GNTTAB_LIST_END) {  in gnttab_free_grant_references()
564 		ref = gnttab_entry(ref);  in gnttab_free_grant_references()
567 	gnttab_entry(ref) = gnttab_free_head;  in gnttab_free_grant_references()
1051 			foreign->gref = map_ops[i].ref;  in gnttab_map_refs()