powerpc/mm/radix: Add radix THP callbacks

The deposited pgtable_t is a pte fragment hence we cannot use page->lru
for linking then together. We use the first two 64 bits for pte fragment
as list_head type to link all deposited fragments together. On withdraw
we properly zero then out.

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

arch/powerpc/include/asm/book3s/64/pgtable-64k.h

@@ -71,6 +71,8 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
 
 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 {
+	if (radix_enabled())
+		return radix__pmd_mkhuge(pmd);
 	return hash__pmd_mkhuge(pmd);
 }
 

arch/powerpc/include/asm/book3s/64/pgtable.h

@@ -827,6 +827,8 @@ extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
 extern int hash__has_transparent_hugepage(void);
 static inline int has_transparent_hugepage(void)
 {
+	if (radix_enabled())
+		return radix__has_transparent_hugepage();
 	return hash__has_transparent_hugepage();
 }
 
@@ -834,6 +836,8 @@ static inline unsigned long
 pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp,
 		    unsigned long clr, unsigned long set)
 {
+	if (radix_enabled())
+		return radix__pmd_hugepage_update(mm, addr, pmdp, clr, set);
 	return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set);
 }
 
@@ -885,12 +889,16 @@ extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 					    unsigned long addr, pmd_t *pmdp)
 {
+	if (radix_enabled())
+		return radix__pmdp_huge_get_and_clear(mm, addr, pmdp);
 	return hash__pmdp_huge_get_and_clear(mm, addr, pmdp);
 }
 
 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
 					unsigned long address, pmd_t *pmdp)
 {
+	if (radix_enabled())
+		return radix__pmdp_collapse_flush(vma, address, pmdp);
 	return hash__pmdp_collapse_flush(vma, address, pmdp);
 }
 #define pmdp_collapse_flush pmdp_collapse_flush
@@ -899,6 +907,8 @@ static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
 static inline void pgtable_trans_huge_deposit(struct mm_struct *mm,
 					      pmd_t *pmdp, pgtable_t pgtable)
 {
+	if (radix_enabled())
+		return radix__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
 	return hash__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
 }
 
@@ -906,6 +916,8 @@ static inline void pgtable_trans_huge_deposit(struct mm_struct *mm,
 static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm,
 						    pmd_t *pmdp)
 {
+	if (radix_enabled())
+		return radix__pgtable_trans_huge_withdraw(mm, pmdp);
 	return hash__pgtable_trans_huge_withdraw(mm, pmdp);
 }
 
@@ -917,6 +929,8 @@ extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma,
 					   unsigned long address, pmd_t *pmdp)
 {
+	if (radix_enabled())
+		return radix__pmdp_huge_split_prepare(vma, address, pmdp);
 	return hash__pmdp_huge_split_prepare(vma, address, pmdp);
 }
 
@@ -925,6 +939,8 @@ struct spinlock;
 static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
 					 struct spinlock *old_pmd_ptl)
 {
+	if (radix_enabled())
+		return false;
 	/*
 	 * Archs like ppc64 use pgtable to store per pmd
 	 * specific information. So when we switch the pmd,

arch/powerpc/include/asm/book3s/64/radix.h

@@ -196,6 +196,28 @@ static inline int radix__pmd_trans_huge(pmd_t pmd)
 	return !!(pmd_val(pmd) & _PAGE_PTE);
 }
 
+static inline pmd_t radix__pmd_mkhuge(pmd_t pmd)
+{
+	return __pmd(pmd_val(pmd) | _PAGE_PTE);
+}
+static inline void radix__pmdp_huge_split_prepare(struct vm_area_struct *vma,
+					    unsigned long address, pmd_t *pmdp)
+{
+	/* Nothing to do for radix. */
+	return;
+}
+
+extern unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
+					  pmd_t *pmdp, unsigned long clr,
+					  unsigned long set);
+extern pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma,
+				  unsigned long address, pmd_t *pmdp);
+extern void radix__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
+					pgtable_t pgtable);
+extern pgtable_t radix__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
+extern pmd_t radix__pmdp_huge_get_and_clear(struct mm_struct *mm,
+				      unsigned long addr, pmd_t *pmdp);
+extern int radix__has_transparent_hugepage(void);
 #endif
 
 extern int __meminit radix__vmemmap_create_mapping(unsigned long start,