This does not actually enable huge vmap mappings, because powerpc/64
ioremap does not call ioremap_page_range, but it is required before
implementing huge mappings in ioremap, because the generic vunmap code
needs to cope with them.
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/mm/book3s64/radix_pgtable.c | 93 ++++++++++++++++++++++++
2 files changed, 94 insertions(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d7996cfaceca..ffac84600e0e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -166,6 +166,7 @@ config PPC
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select HAVE_ARCH_AUDITSYSCALL
+ select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
select HAVE_ARCH_JUMP_LABEL
select HAVE_ARCH_KASAN if PPC32
select HAVE_ARCH_KGDB
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index c9bcf428dd2b..3bc9ade56277 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -1122,3 +1122,96 @@ void radix__ptep_modify_prot_commit(struct vm_area_struct *vma,
set_pte_at(mm, addr, ptep, pte);
}
+
+int __init arch_ioremap_pud_supported(void)
+{
+ return radix_enabled();
+}
+
+int __init arch_ioremap_pmd_supported(void)
+{
+ return radix_enabled();
+}
+
+int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
+{
+ return 0;
+}
+
+int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
+{
+ pte_t *ptep = (pte_t *)pud;
+ pte_t new_pud = pfn_pte(__phys_to_pfn(addr), prot);
+
+ set_pte_at(&init_mm, 0 /* radix unused */, ptep, new_pud);
+
+ return 1;
+}
+
+int pud_clear_huge(pud_t *pud)
+{
+ if (pud_huge(*pud)) {
+ pud_clear(pud);
+ return 1;
+ }
+
+ return 0;
+}
+
+int pud_free_pmd_page(pud_t *pud, unsigned long addr)
+{
+ pmd_t *pmd;
+ int i;
+
+ pmd = (pmd_t *)pud_page_vaddr(*pud);
+ pud_clear(pud);
+
+ flush_tlb_kernel_range(addr, addr + PUD_SIZE);
+
+ for (i = 0; i < PTRS_PER_PMD; i++) {
+ if (!pmd_none(pmd[i])) {
+ pte_t *pte;
+ pte = (pte_t *)pmd_page_vaddr(pmd[i]);
+
+ pte_free_kernel(&init_mm, pte);
+ }
+ }
+
+ pmd_free(&init_mm, pmd);
+
+ return 1;
+}
+
+int pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot)
+{
+ pte_t *ptep = (pte_t *)pmd;
+ pte_t new_pmd = pfn_pte(__phys_to_pfn(addr), prot);
+
+ set_pte_at(&init_mm, 0 /* radix unused */, ptep, new_pmd);
+
+ return 1;
+}
+
+int pmd_clear_huge(pmd_t *pmd)
+{
+ if (pmd_huge(*pmd)) {
+ pmd_clear(pmd);
+ return 1;
+ }
+
+ return 0;
+}
+
+int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
+{
+ pte_t *pte;
+
+ pte = (pte_t *)pmd_page_vaddr(*pmd);
+ pmd_clear(pmd);
+
+ flush_tlb_kernel_range(addr, addr + PMD_SIZE);
+
+ pte_free_kernel(&init_mm, pte);
+
+ return 1;
+}
--
2.20.1
