/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_HUGETLB_H
#define _ASM_POWERPC_BOOK3S_64_HUGETLB_H
/*
 * For radix we want generic code to handle hugetlb. But then if we want
 * both hash and radix to be enabled together we need to workaround the
 * limitations.
 */
void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
extern unsigned long
radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
				unsigned long len, unsigned long pgoff,
				unsigned long flags);

extern void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
						unsigned long addr, pte_t *ptep,
						pte_t old_pte, pte_t pte);

static inline int hstate_get_psize(struct hstate *hstate)
{
	unsigned long shift;

	shift = huge_page_shift(hstate);
	if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
		return MMU_PAGE_2M;
	else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
		return MMU_PAGE_1G;
	else if (shift == mmu_psize_defs[MMU_PAGE_16M].shift)
		return MMU_PAGE_16M;
	else if (shift == mmu_psize_defs[MMU_PAGE_16G].shift)
		return MMU_PAGE_16G;
	else {
		WARN(1, "Wrong huge page shift\n");
		return mmu_virtual_psize;
	}
}

#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
static inline bool gigantic_page_supported(void)
{
	/*
	 * We used gigantic page reservation with hypervisor assist in some case.
	 * We cannot use runtime allocation of gigantic pages in those platforms
	 * This is hash translation mode LPARs.
	 */
	if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
		return false;

	return true;
}
#endif

/* hugepd entry valid bit */
#define HUGEPD_VAL_BITS		(0x8000000000000000UL)

#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
					 unsigned long addr, pte_t *ptep);

#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
					 unsigned long addr, pte_t *ptep,
					 pte_t old_pte, pte_t new_pte);
#endif