powerpc/mm/nohash: Remove pte fragment dependency from nohash

Now that we have removed 64K page size support, the RCU page table free can
be much simpler for nohash. Make a copy of the the rcu callback to pgalloc.h
header similar to nohash 32. We could possibly merge 32 and 64 bit there. But
that is for a later patch

We also move the book3s specific handler to pgtable_book3s64.c. This will be
updated in a later patch to handle split pmd ptlock.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 45 insertions, 12 deletions

diff --git a/arch/powerpc/include/asm/nohash/64/pgalloc.h b/arch/powerpc/include/asm/nohash/64/pgalloc.h
index a6baf3c13bb5..21624ff1f065 100644
--- a/arch/powerpc/include/asm/nohash/64/pgalloc.h
+++ b/arch/powerpc/include/asm/nohash/64/pgalloc.h
@@ -84,6 +84,18 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 
 #define pmd_pgtable(pmd) pmd_page(pmd)
 
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+	return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
+			pgtable_gfp_flags(mm, GFP_KERNEL));
+}
+
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+	kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
+}
+
+
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 					  unsigned long address)
 {
@@ -118,26 +130,47 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 	__free_page(ptepage);
 }
 
-extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
+static inline void pgtable_free(void *table, int shift)
+{
+	if (!shift) {
+		pgtable_page_dtor(table);
+		free_page((unsigned long)table);
+	} else {
+		BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
+		kmem_cache_free(PGT_CACHE(shift), table);
+	}
+}
+
 #ifdef CONFIG_SMP
-extern void __tlb_remove_table(void *_table);
-#endif
-static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
-				  unsigned long address)
+static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
 {
-	tlb_flush_pgtable(tlb, address);
-	pgtable_free_tlb(tlb, page_address(table), 0);
+	unsigned long pgf = (unsigned long)table;
+
+	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
+	pgf |= shift;
+	tlb_remove_table(tlb, (void *)pgf);
 }
 
-static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
+static inline void __tlb_remove_table(void *_table)
 {
-	return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
-			pgtable_gfp_flags(mm, GFP_KERNEL));
+	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
+	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
+
+	pgtable_free(table, shift);
 }
 
-static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+#else
+static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
 {
-	kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
+	pgtable_free(table, shift);
+}
+#endif
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
+				  unsigned long address)
+{
+	tlb_flush_pgtable(tlb, address);
+	pgtable_free_tlb(tlb, page_address(table), 0);
 }
 
 #define __pmd_free_tlb(tlb, pmd, addr)		      \