[RFC PATCH v2 05/20] powerpc/mm: Allow hugepages without hugepd

Christophe Leroy
2024-05-17T19:00:44Z

In preparation of implementing huge pages on powerpc 8xx
without hugepd, enclose hugepd related code inside an
ifdef CONFIG_ARCH_HAS_HUGEPD

This also allows removing some stubs.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/book3s/32/pgalloc.h | 2 --
arch/powerpc/include/asm/hugetlb.h | 10 ++--------
arch/powerpc/include/asm/nohash/pgtable.h | 8 +++++---
arch/powerpc/mm/hugetlbpage.c | 13 +++++++++++++
arch/powerpc/mm/pgtable.c | 2 ++
5 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/32/pgalloc.h b/arch/powerpc/include/asm/book3s/32/pgalloc.h
index dc5c039eb28e..dd4eb3063175 100644
--- a/arch/powerpc/include/asm/book3s/32/pgalloc.h
+++ b/arch/powerpc/include/asm/book3s/32/pgalloc.h
@@ -47,8 +47,6 @@ static inline void pgtable_free(void *table, unsigned index_size)
}
}

-#define get_hugepd_cache_index(x) (x)
-
static inline void pgtable_free_tlb(struct mmu_gather *tlb,
void *table, int shift)
{
diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
index ea71f7245a63..79176a499763 100644
--- a/arch/powerpc/include/asm/hugetlb.h
+++ b/arch/powerpc/include/asm/hugetlb.h
@@ -30,10 +30,12 @@ static inline int is_hugepage_only_range(struct mm_struct *mm,
}
#define is_hugepage_only_range is_hugepage_only_range

+#ifdef CONFIG_ARCH_HAS_HUGEPD
#define __HAVE_ARCH_HUGETLB_FREE_PGD_RANGE
void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
unsigned long end, unsigned long floor,
unsigned long ceiling);
+#endif

#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
@@ -67,14 +69,6 @@ static inline void flush_hugetlb_page(struct vm_area_struct *vma,
{
}

-#define hugepd_shift(x) 0
-static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
- unsigned pdshift)
-{
- return NULL;
-}
-
-
static inline void __init gigantic_hugetlb_cma_reserve(void)
{
}
diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h
index 427db14292c9..ac3353f7f2ac 100644
--- a/arch/powerpc/include/asm/nohash/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/pgtable.h
@@ -340,7 +340,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,

#define pgprot_writecombine pgprot_noncached_wc

-#ifdef CONFIG_HUGETLB_PAGE
+#ifdef CONFIG_ARCH_HAS_HUGEPD
static inline int hugepd_ok(hugepd_t hpd)
{
#ifdef CONFIG_PPC_8xx
@@ -351,6 +351,10 @@ static inline int hugepd_ok(hugepd_t hpd)
#endif
}

+#define is_hugepd(hpd) (hugepd_ok(hpd))
+#endif
+
+#ifdef CONFIG_HUGETLB_PAGE
static inline int pmd_huge(pmd_t pmd)
{
return 0;
@@ -360,8 +364,6 @@ static inline int pud_huge(pud_t pud)
{
return 0;
}
-
-#define is_hugepd(hpd) (hugepd_ok(hpd))
#endif

int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 66ac56b26007..82495b8ea793 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -42,6 +42,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long s
return __find_linux_pte(mm->pgd, addr, NULL, NULL);
}

+#ifdef CONFIG_ARCH_HAS_HUGEPD
static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
unsigned long address, unsigned int pdshift,
unsigned int pshift, spinlock_t *ptl)
@@ -193,6 +194,16 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,

return hugepte_offset(*hpdp, addr, pdshift);
}
+#else
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long sz)
+{
+ if (sz < PMD_SIZE)
+ return pte_alloc_huge(mm, pmd_off(mm, addr), addr, sz);
+
+ return NULL;
+}
+#endif

#ifdef CONFIG_PPC_BOOK3S_64
/*
@@ -248,6 +259,7 @@ int __init alloc_bootmem_huge_page(struct hstate *h, int nid)
return __alloc_bootmem_huge_page(h, nid);
}

+#ifdef CONFIG_ARCH_HAS_HUGEPD
#ifndef CONFIG_PPC_BOOK3S_64
#define HUGEPD_FREELIST_SIZE \
((PAGE_SIZE - sizeof(struct hugepd_freelist)) / sizeof(pte_t))
@@ -505,6 +517,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
}
} while (addr = next, addr != end);
}
+#endif

bool __init arch_hugetlb_valid_size(unsigned long size)
{
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 9e7ba9c3851f..acdf64c9b93e 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -487,8 +487,10 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
if (!hpdp)
return NULL;

+#ifdef CONFIG_ARCH_HAS_HUGEPD
ret_pte = hugepte_offset(*hpdp, ea, pdshift);
pdshift = hugepd_shift(*hpdp);
+#endif
out:
if (hpage_shift)
*hpage_shift = pdshift;
--
2.44.0