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>
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable-64k.h b/arch/powerpc/include/asm/book3s/64/pgtable-64k.h
index 79331cf..793ecd5 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable-64k.h
@@ -71,6 +71,8 @@
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
+ if (radix_enabled())
+ return radix__pmd_mkhuge(pmd);
return hash__pmd_mkhuge(pmd);
}
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 5f290d3..1b09ba0 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -827,6 +827,8 @@
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 @@
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 @@
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 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 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 @@
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 @@
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,
diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index f470902..937d4e2 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -196,6 +196,28 @@
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,
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
index d566a25..eb44511 100644
--- a/arch/powerpc/mm/pgtable-book3s64.c
+++ b/arch/powerpc/mm/pgtable-book3s64.c
@@ -69,7 +69,7 @@
pmd_t *pmdp)
{
pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
-
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
/*
* This ensures that generic code that rely on IRQ disabling
* to prevent a parallel THP split work as expected.
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index a5a5253..18b2c11 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -19,6 +19,8 @@
#include <asm/mmu.h>
#include <asm/firmware.h>
+#include <trace/events/thp.h>
+
static int native_update_partition_table(u64 patb1)
{
partition_tb->patb1 = cpu_to_be64(patb1);
@@ -407,3 +409,118 @@
}
#endif
#endif
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+
+unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, unsigned long clr,
+ unsigned long set)
+{
+ unsigned long old;
+
+#ifdef CONFIG_DEBUG_VM
+ WARN_ON(!radix__pmd_trans_huge(*pmdp));
+ assert_spin_locked(&mm->page_table_lock);
+#endif
+
+ old = radix__pte_update(mm, addr, (pte_t *)pmdp, clr, set, 1);
+ trace_hugepage_update(addr, old, clr, set);
+
+ return old;
+}
+
+pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp)
+
+{
+ pmd_t pmd;
+
+ VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ VM_BUG_ON(radix__pmd_trans_huge(*pmdp));
+ /*
+ * khugepaged calls this for normal pmd
+ */
+ pmd = *pmdp;
+ pmd_clear(pmdp);
+ /*FIXME!! Verify whether we need this kick below */
+ kick_all_cpus_sync();
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+ return pmd;
+}
+
+/*
+ * For us pgtable_t is pte_t *. Inorder to save the deposisted
+ * page table, we consider the allocated page table as a list
+ * head. On withdraw we need to make sure we zero out the used
+ * list_head memory area.
+ */
+void radix__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
+ pgtable_t pgtable)
+{
+ struct list_head *lh = (struct list_head *) pgtable;
+
+ assert_spin_locked(pmd_lockptr(mm, pmdp));
+
+ /* FIFO */
+ if (!pmd_huge_pte(mm, pmdp))
+ INIT_LIST_HEAD(lh);
+ else
+ list_add(lh, (struct list_head *) pmd_huge_pte(mm, pmdp));
+ pmd_huge_pte(mm, pmdp) = pgtable;
+}
+
+pgtable_t radix__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
+{
+ pte_t *ptep;
+ pgtable_t pgtable;
+ struct list_head *lh;
+
+ assert_spin_locked(pmd_lockptr(mm, pmdp));
+
+ /* FIFO */
+ pgtable = pmd_huge_pte(mm, pmdp);
+ lh = (struct list_head *) pgtable;
+ if (list_empty(lh))
+ pmd_huge_pte(mm, pmdp) = NULL;
+ else {
+ pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next;
+ list_del(lh);
+ }
+ ptep = (pte_t *) pgtable;
+ *ptep = __pte(0);
+ ptep++;
+ *ptep = __pte(0);
+ return pgtable;
+}
+
+
+pmd_t radix__pmdp_huge_get_and_clear(struct mm_struct *mm,
+ unsigned long addr, pmd_t *pmdp)
+{
+ pmd_t old_pmd;
+ unsigned long old;
+
+ old = radix__pmd_hugepage_update(mm, addr, pmdp, ~0UL, 0);
+ old_pmd = __pmd(old);
+ /*
+ * Serialize against find_linux_pte_or_hugepte which does lock-less
+ * lookup in page tables with local interrupts disabled. For huge pages
+ * it casts pmd_t to pte_t. Since format of pte_t is different from
+ * pmd_t we want to prevent transit from pmd pointing to page table
+ * to pmd pointing to huge page (and back) while interrupts are disabled.
+ * We clear pmd to possibly replace it with page table pointer in
+ * different code paths. So make sure we wait for the parallel
+ * find_linux_pte_or_hugepage to finish.
+ */
+ kick_all_cpus_sync();
+ return old_pmd;
+}
+
+int radix__has_transparent_hugepage(void)
+{
+ /* For radix 2M at PMD level means thp */
+ if (mmu_psize_defs[MMU_PAGE_2M].shift == PMD_SHIFT)
+ return 1;
+ return 0;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */