hugetlb.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ASM_POWERPC_BOOK3S_64_HUGETLB_H
  3#define _ASM_POWERPC_BOOK3S_64_HUGETLB_H
  4
  5#include <asm/firmware.h>
  6
  7/*
  8 * For radix we want generic code to handle hugetlb. But then if we want
  9 * both hash and radix to be enabled together we need to workaround the
 10 * limitations.
 11 */
 12void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 13void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 14
 15extern void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
 16						unsigned long addr, pte_t *ptep,
 17						pte_t old_pte, pte_t pte);
 18
 19static inline int hstate_get_psize(struct hstate *hstate)
 20{
 21	unsigned long shift;
 22
 23	shift = huge_page_shift(hstate);
 24	if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
 25		return MMU_PAGE_2M;
 26	else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
 27		return MMU_PAGE_1G;
 28	else if (shift == mmu_psize_defs[MMU_PAGE_16M].shift)
 29		return MMU_PAGE_16M;
 30	else if (shift == mmu_psize_defs[MMU_PAGE_16G].shift)
 31		return MMU_PAGE_16G;
 32	else {
 33		WARN(1, "Wrong huge page shift\n");
 34		return mmu_virtual_psize;
 35	}
 36}
 37
 38#define __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED
 39static inline bool gigantic_page_runtime_supported(void)
 40{
 41	/*
 42	 * We used gigantic page reservation with hypervisor assist in some case.
 43	 * We cannot use runtime allocation of gigantic pages in those platforms
 44	 * This is hash translation mode LPARs.
 45	 */
 46	if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
 47		return false;
 48
 49	return true;
 50}
 51
 52#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
 53extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
 54					 unsigned long addr, pte_t *ptep);
 55
 56#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
 57extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
 58					 unsigned long addr, pte_t *ptep,
 59					 pte_t old_pte, pte_t new_pte);
 60
 61static inline void flush_hugetlb_page(struct vm_area_struct *vma,
 62				      unsigned long vmaddr)
 63{
 64	if (radix_enabled())
 65		return radix__flush_hugetlb_page(vma, vmaddr);
 66}
 67
 68void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
 69
 70static inline int check_and_get_huge_psize(int shift)
 71{
 72	int mmu_psize;
 73
 74	if (shift > SLICE_HIGH_SHIFT)
 75		return -EINVAL;
 76
 77	mmu_psize = shift_to_mmu_psize(shift);
 78
 79	/*
 80	 * We need to make sure that for different page sizes reported by
 81	 * firmware we only add hugetlb support for page sizes that can be
 82	 * supported by linux page table layout.
 83	 * For now we have
 84	 * Radix: 2M and 1G
 85	 * Hash: 16M and 16G
 86	 */
 87	if (radix_enabled()) {
 88		if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G)
 89			return -EINVAL;
 90	} else {
 91		if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
 92			return -EINVAL;
 93	}
 94	return mmu_psize;
 95}
 96
 97#define arch_has_huge_bootmem_alloc arch_has_huge_bootmem_alloc
 98
 99static inline bool arch_has_huge_bootmem_alloc(void)
100{
101	return (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled());
102}
103#endif