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Differential D22822 Diff 65908 head/sys/dev/xen/gntdev/gntdev.c

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head/sys/dev/xen/gntdev/gntdev.c

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} }
static int static int
gntdev_gmap_pg_fault(vm_object_t object, vm_ooffset_t offset, int prot, gntdev_gmap_pg_fault(vm_object_t object, vm_ooffset_t offset, int prot,
vm_page_t *mres) vm_page_t *mres)
{ {
struct gntdev_gmap *gmap = object->handle; struct gntdev_gmap *gmap = object->handle;
vm_pindex_t pidx, ridx; vm_pindex_t pidx, ridx;
vm_page_t page, oldm; vm_page_t page;
vm_ooffset_t relative_offset; vm_ooffset_t relative_offset;
if (gmap->map == NULL) if (gmap->map == NULL)
return (VM_PAGER_FAIL); return (VM_PAGER_FAIL);
relative_offset = offset - gmap->file_index; relative_offset = offset - gmap->file_index;
pidx = OFF_TO_IDX(offset); pidx = OFF_TO_IDX(offset);
ridx = OFF_TO_IDX(relative_offset); ridx = OFF_TO_IDX(relative_offset);
if (ridx >= gmap->count || if (ridx >= gmap->count ||
gmap->grant_map_ops[ridx].status != GNTST_okay) gmap->grant_map_ops[ridx].status != GNTST_okay)
return (VM_PAGER_FAIL); return (VM_PAGER_FAIL);
page = PHYS_TO_VM_PAGE(gmap->map->phys_base_addr + relative_offset); page = PHYS_TO_VM_PAGE(gmap->map->phys_base_addr + relative_offset);
if (page == NULL) if (page == NULL)
return (VM_PAGER_FAIL); return (VM_PAGER_FAIL);
KASSERT((page->flags & PG_FICTITIOUS) != 0, KASSERT((page->flags & PG_FICTITIOUS) != 0,
("not fictitious %p", page)); ("not fictitious %p", page));
KASSERT(vm_page_wired(page), ("page %p is not wired", page)); KASSERT(vm_page_wired(page), ("page %p is not wired", page));
KASSERT(!vm_page_busied(page), ("page %p is busy", page)); KASSERT(!vm_page_busied(page), ("page %p is busy", page));
if (*mres != NULL) {
oldm = *mres;
vm_page_free(oldm);
*mres = NULL;
}
vm_page_busy_acquire(page, 0); vm_page_busy_acquire(page, 0);
vm_page_valid(page); vm_page_valid(page);
if (*mres != NULL)
vm_page_replace(page, object, pidx, *mres);
else
vm_page_insert(page, object, pidx); vm_page_insert(page, object, pidx);
*mres = page; *mres = page;
return (VM_PAGER_OK); return (VM_PAGER_OK);
} }
/*------------------ Grant Table Methods ------------------------------------*/ /*------------------ Grant Table Methods ------------------------------------*/
static void static void
notify(struct notify_data *notify, vm_page_t page) notify(struct notify_data *notify, vm_page_t page)
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