C++ (Cpp) gnttab_unmap_refs примеры использования

Пример #1

Файл: grant-table.c Проект: DenisLug/mptcp

static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item)
{
	int ret;
	int pc;

	for (pc = 0; pc < item->count; pc++) {
		if (page_count(item->pages[pc]) > 1) {
			unsigned long delay = GNTTAB_UNMAP_REFS_DELAY * (item->age + 1);
			schedule_delayed_work(&item->gnttab_work,
					      msecs_to_jiffies(delay));
			return;
		}
	}

	ret = gnttab_unmap_refs(item->unmap_ops, item->kunmap_ops,
				item->pages, item->count);
	item->done(ret, item);
}

Пример #2

Файл: omx_xenback_reg.c Проект: ananos/xen2mx

int omx_xen_deregister_user_segment(omx_xenif_t * omx_xenif, uint32_t id,
				    uint32_t sid, uint8_t eid)
{
	struct gnttab_unmap_grant_ref ops;
	struct backend_info *be = omx_xenif->be;
	struct omxback_dev *dev = be->omxdev;
	struct omx_endpoint *endpoint = dev->endpoints[eid];
	struct omx_xen_user_region *region;
	struct omx_xen_user_region_segment *seg;
	int i, k, ret = 0;
	unsigned int level;

	dprintk_in();

	TIMER_START(&t_dereg_seg);
	if (eid < 0 && eid >= 255) {
		printk_err
		    ("Wrong endpoint number (%u) check your frontend/backend communication!\n",
		     eid);
		ret = -EINVAL;
		goto out;
	}

	region = rcu_dereference_protected(endpoint->xen_regions[id], 1);
	if (unlikely(!region)) {
		printk_err(
		       "%s: Cannot access non-existing region %d\n", __func__, id);
		//ret = -EINVAL;
		goto out;
	}
	seg = &region->segments[sid];


	TIMER_START(&t_release_grants);
	if (!seg->unmap) {
		printk_err("seg->unmap is NULL\n");
		ret = -EINVAL;
		goto out;
	}
	gnttab_unmap_refs(seg->unmap, NULL, seg->pages, seg->nr_pages);
	TIMER_STOP(&t_release_grants);

	TIMER_START(&t_release_gref_list);
	for (k = 0; k < seg->nr_parts; k++) {
#ifdef EXTRA_DEBUG_OMX
		if (!seg->vm_gref) {
			printk(KERN_ERR "vm_gref is NULL\n");
			ret = -EFAULT;
			goto out;
		}
		if (!seg->vm_gref[k]) {
			printk(KERN_ERR "vm_gref[%d] is NULL\n", k);
			ret = -EFAULT;
			goto out;
		}
		if (!seg->vm_gref[k]->addr) {
			printk(KERN_ERR "vm_gref[%d]->addr is NULL\n", k);
			ret = -EFAULT;
			goto out;
		}
		if (!seg->all_handle[k]) {
			printk(KERN_ERR "all_handle[%d] is NULL\n", k);
			ret = -EINVAL;
			goto out;
		}
#endif
		gnttab_set_unmap_op(&ops, (unsigned long)seg->vm_gref[k]->addr,
				    GNTMAP_host_map | GNTMAP_contains_pte,
				    seg->all_handle[k]);
		ops.host_addr =
		    arbitrary_virt_to_machine(lookup_address
					      ((unsigned long)(seg->vm_gref[k]->
							       addr),
					       &level)).maddr;

		dprintk_deb("putting vm_area[%d] %#lx, handle = %#x \n", k,
			    (unsigned long)seg->vm_gref[k], seg->all_handle[k]);
		if (HYPERVISOR_grant_table_op
		    (GNTTABOP_unmap_grant_ref, &ops, 1)){
			printk_err
				("HYPERVISOR operation failed\n");
			//BUG();
		}
		if (ops.status) {
			printk_err
				("HYPERVISOR unmap grant ref[%d]=%#lx failed status = %d",
				 k, seg->all_handle[k], ops.status);
			ret = ops.status;
			goto out;
		}
	}
	TIMER_STOP(&t_release_gref_list);

	TIMER_START(&t_free_pages);
	for (k=0;k<seg->nr_parts;k++)
		if (ops.status == GNTST_okay)
			free_vm_area(seg->vm_gref[k]);

	kfree(seg->map);
	kfree(seg->unmap);
	kfree(seg->gref_list);
#ifdef OMX_XEN_COOKIES
	omx_xen_page_put_cookie(omx_xenif, seg->cookie);
#else
	free_xenballooned_pages(seg->nr_pages, seg->pages);
	kfree(seg->pages);
#endif
	TIMER_STOP(&t_free_pages);

out:
	TIMER_STOP(&t_dereg_seg);
	dprintk_out();
	return ret;

}