/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_HUGETLB_H
#define _ASM_POWERPC_BOOK3S_64_HUGETLB_H
#include <asm /firmware.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 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;
}
}
#define __HAVE_ARCH_GIGANTIC_PAGE_RUNTIME_SUPPORTED
static inline bool gigantic_page_runtime_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 ;
}
#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);
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
if (radix_enabled())
return radix__flush_hugetlb_page(vma, vmaddr);
}
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
static inline int check_and_get_huge_psize(int shift)
{
int mmu_psize;
if (shift > SLICE_HIGH_SHIFT)
return -EINVAL;
mmu_psize = shift_to_mmu_psize(shift);
/*
* We need to make sure that for different page sizes reported by
* firmware we only add hugetlb support for page sizes that can be
* supported by linux page table layout .
* For now we have
* Radix : 2 M and 1 G
* Hash : 16 M and 16 G
*/
if (radix_enabled()) {
if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G)
return -EINVAL;
} else {
if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
return -EINVAL;
}
return mmu_psize;
}
#define arch_has_huge_bootmem_alloc arch_has_huge_bootmem_alloc
static inline bool arch_has_huge_bootmem_alloc(void )
{
return (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled());
}
#endif
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(vorverarbeitet am 2026-09-30)
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