C++ (Cpp) __max_nr_grant_frames Examples

Example #1

File: gnttab.c Project: Jinjian0609/UVP-Tools

int __devinit gnttab_init(void)
{
	int i;
	unsigned int max_nr_glist_frames, nr_glist_frames;
	unsigned int nr_init_grefs;

	if (!is_running_on_xen())
		return -ENODEV;

	nr_grant_frames = 1;
	boot_max_nr_grant_frames = __max_nr_grant_frames();

	/* Determine the maximum number of frames required for the
	 * grant reference free list on the current hypervisor.
	 */
	max_nr_glist_frames = nr_freelist_frames(boot_max_nr_grant_frames);

	gnttab_list = kmalloc(max_nr_glist_frames * sizeof(grant_ref_t *),
			      GFP_KERNEL);
	if (gnttab_list == NULL)
		return -ENOMEM;

	nr_glist_frames = nr_freelist_frames(nr_grant_frames);
	for (i = 0; i < nr_glist_frames; i++) {
		gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL);
		if (gnttab_list[i] == NULL)
			goto ini_nomem;
	}

	if (gnttab_resume() < 0)
		return -ENODEV;

	nr_init_grefs = nr_grant_frames * ENTRIES_PER_GRANT_FRAME;

	for (i = NR_RESERVED_ENTRIES; i < nr_init_grefs - 1; i++)
		gnttab_entry(i) = i + 1;

	gnttab_entry(nr_init_grefs - 1) = GNTTAB_LIST_END;
	gnttab_free_count = nr_init_grefs - NR_RESERVED_ENTRIES;
	gnttab_free_head  = NR_RESERVED_ENTRIES;

	return 0;

 ini_nomem:
	for (i--; i >= 0; i--)
		free_page((unsigned long)gnttab_list[i]);
	kfree(gnttab_list);
	return -ENOMEM;
}

Example #2

File: gnttab.c Project: AsadRaza/OCTEON-Linux

int __devinit gnttab_init(void)
{
	int i;
	unsigned int max_nr_glist_frames, nr_glist_frames;
	unsigned int nr_init_grefs;

	if (!is_running_on_xen())
		return -ENODEV;

#if defined(CONFIG_XEN) && defined(CONFIG_PM_SLEEP)
	if (!is_initial_xendomain()) {
		int err = sysdev_class_register(&gnttab_sysclass);

		if (!err)
			err = sysdev_register(&device_gnttab);
		if (err)
			return err;
	}
#endif

	nr_grant_frames = 1;
	boot_max_nr_grant_frames = __max_nr_grant_frames();

	/* Determine the maximum number of frames required for the
	 * grant reference free list on the current hypervisor.
	 */
	max_nr_glist_frames = nr_freelist_frames(boot_max_nr_grant_frames);

	gnttab_list = kmalloc(max_nr_glist_frames * sizeof(grant_ref_t *),
			      GFP_KERNEL);
	if (gnttab_list == NULL)
		return -ENOMEM;

	nr_glist_frames = nr_freelist_frames(nr_grant_frames);
	for (i = 0; i < nr_glist_frames; i++) {
		gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL);
		if (gnttab_list[i] == NULL)
			goto ini_nomem;
	}

	if (gnttab_resume() < 0)
		return -ENODEV;

	nr_init_grefs = nr_grant_frames * ENTRIES_PER_GRANT_FRAME;

	for (i = NR_RESERVED_ENTRIES; i < nr_init_grefs - 1; i++)
		gnttab_entry(i) = i + 1;

	gnttab_entry(nr_init_grefs - 1) = GNTTAB_LIST_END;
	gnttab_free_count = nr_init_grefs - NR_RESERVED_ENTRIES;
	gnttab_free_head  = NR_RESERVED_ENTRIES;

#if defined(CONFIG_XEN) && defined(__HAVE_ARCH_PTE_SPECIAL)
	if (!xen_feature(XENFEAT_auto_translated_physmap)
	    && xen_feature(XENFEAT_gnttab_map_avail_bits)) {
#ifdef CONFIG_X86
		GNTMAP_pte_special = (__pte_val(pte_mkspecial(__pte_ma(0)))
				      >> _PAGE_BIT_UNUSED1) << _GNTMAP_guest_avail0;
#else
#error Architecture not yet supported.
#endif
	}