include/xen/grant_table.h

6  * 2. Accessing others' memory reservations via grant references.
7  * (i.e., mechanisms for both sender and recipient of grant references)
9  * Copyright (c) 2004-2005, K A Fraser
50 #include <linux/page-flags.h>
54  * Technically there's no reliably invalid grant reference or grant handle,
57 #define INVALID_GRANT_REF          ((grant_ref_t)-1)
58 #define INVALID_GRANT_HANDLE       ((grant_handle_t)-1)
94  * End access through the given grant reference, iff the grant entry is no
95  * longer in use.  Return 1 if the grant entry was freed, 0 if it is still in
101  * Eventually end access through the given grant reference, and once that
103  * immediately iff the grant entry is not in use, otherwise it will happen
110  * the grant is no longer in use.
118  * End access through the given grant reference, iff the grant entry is
120  * grant reference is deallocated.
121  * Return 1 if the grant entry was freed, 0 if it is still in use.
126  * operations on reserved batches of grant references
166 		map->host_addr = addr;  in gnttab_set_map_op()
168 		map->host_addr = __pa(addr);  in gnttab_set_map_op()
170 		map->host_addr = addr;  in gnttab_set_map_op()
172 	map->flags = flags;  in gnttab_set_map_op()
173 	map->ref = ref;  in gnttab_set_map_op()
174 	map->dom = domid;  in gnttab_set_map_op()
175 	map->status = 1; /* arbitrary positive value */  in gnttab_set_map_op()
183 		unmap->host_addr = addr;  in gnttab_set_unmap_op()
185 		unmap->host_addr = __pa(addr);  in gnttab_set_unmap_op()
187 		unmap->host_addr = addr;  in gnttab_set_unmap_op()
189 	unmap->handle = handle;  in gnttab_set_unmap_op()
190 	unmap->dev_bus_addr = 0;  in gnttab_set_unmap_op()
236 	/* Device for which DMA memory will be/was allocated. */
238 	/* If set then DMA buffer is coherent and write-combine otherwise. */
265 /* Perform a batch of grant map/copy operations. Retry every batch slot
288 	return (struct xen_page_foreign *)page->private;  in xen_page_foreign()
291 	return (struct xen_page_foreign *)&page->private;  in xen_page_foreign()
295 /* Split Linux page in chunk of the size of the grant and call fn
299  *	offset: offset in the grant
300  *	len: length of the data in the grant.
312 /* Helper to get to call fn only on the first "grant chunk" */
317 	/* The first request is limited to the size of one grant */  in gnttab_for_one_grant()
318 	len = min_t(unsigned int, XEN_PAGE_SIZE - (offset & ~XEN_PAGE_MASK),  in gnttab_for_one_grant()
324 /* Get @nr_grefs grants from an array of page and call fn for each grant */
330 /* Get the number of grant in a specified region