powerpc/mm/radix: Add radix pte #defines

This adds Power ISA 3.0 specific pte defines. We share most of the
details with hash Linux page table format. This patch indicates only
things where we differ.

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.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 2643487..c47c3f7 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -205,6 +205,7 @@ extern unsigned long __pgd_table_size;
 #endif /* __ASSEMBLY__ */
 
 #include <asm/book3s/64/hash.h>
+#include <asm/book3s/64/radix.h>
 #include <asm/barrier.h>
 
 /*

diff --git a/arch/powerpc/include/asm/book3s/64/radix-4k.h b/arch/powerpc/include/asm/book3s/64/radix-4k.h
new file mode 100644 (file)
index 0000000..7c3b1fe
--- /dev/null
+++ b/arch/powerpc/include/asm/book3s/64/radix-4k.h
@@ -0,0 +1,12 @@
+#ifndef _ASM_POWERPC_PGTABLE_RADIX_4K_H
+#define _ASM_POWERPC_PGTABLE_RADIX_4K_H
+
+/*
+ * For 4K page size supported index is 13/9/9/9
+ */
+#define RADIX_PTE_INDEX_SIZE  9  /* 2MB huge page */
+#define RADIX_PMD_INDEX_SIZE  9  /* 1G huge page */
+#define RADIX_PUD_INDEX_SIZE    9
+#define RADIX_PGD_INDEX_SIZE  13
+
+#endif /* _ASM_POWERPC_PGTABLE_RADIX_4K_H */

diff --git a/arch/powerpc/include/asm/book3s/64/radix-64k.h b/arch/powerpc/include/asm/book3s/64/radix-64k.h
new file mode 100644 (file)
index 0000000..82dc355
--- /dev/null
+++ b/arch/powerpc/include/asm/book3s/64/radix-64k.h
@@ -0,0 +1,12 @@
+#ifndef _ASM_POWERPC_PGTABLE_RADIX_64K_H
+#define _ASM_POWERPC_PGTABLE_RADIX_64K_H
+
+/*
+ * For 64K page size supported index is 13/9/9/5
+ */
+#define RADIX_PTE_INDEX_SIZE  5  /* 2MB huge page */
+#define RADIX_PMD_INDEX_SIZE  9  /* 1G huge page */
+#define RADIX_PUD_INDEX_SIZE    9
+#define RADIX_PGD_INDEX_SIZE  13
+
+#endif /* _ASM_POWERPC_PGTABLE_RADIX_64K_H */

diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
new file mode 100644 (file)
index 0000000..4b581a0
--- /dev/null
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -0,0 +1,125 @@
+#ifndef _ASM_POWERPC_PGTABLE_RADIX_H
+#define _ASM_POWERPC_PGTABLE_RADIX_H
+
+#ifndef __ASSEMBLY__
+#include <asm/cmpxchg.h>
+#endif
+
+#ifdef CONFIG_PPC_64K_PAGES
+#include <asm/book3s/64/radix-64k.h>
+#else
+#include <asm/book3s/64/radix-4k.h>
+#endif
+
+/* An empty PTE can still have a R or C writeback */
+#define RADIX_PTE_NONE_MASK            (_PAGE_DIRTY | _PAGE_ACCESSED)
+
+/* Bits to set in a RPMD/RPUD/RPGD */
+#define RADIX_PMD_VAL_BITS             (0x8000000000000000UL | RADIX_PTE_INDEX_SIZE)
+#define RADIX_PUD_VAL_BITS             (0x8000000000000000UL | RADIX_PMD_INDEX_SIZE)
+#define RADIX_PGD_VAL_BITS             (0x8000000000000000UL | RADIX_PUD_INDEX_SIZE)
+
+/* Don't have anything in the reserved bits and leaf bits */
+#define RADIX_PMD_BAD_BITS             0x60000000000000e0UL
+#define RADIX_PUD_BAD_BITS             0x60000000000000e0UL
+#define RADIX_PGD_BAD_BITS             0x60000000000000e0UL
+
+/*
+ * Size of EA range mapped by our pagetables.
+ */
+#define RADIX_PGTABLE_EADDR_SIZE (RADIX_PTE_INDEX_SIZE + RADIX_PMD_INDEX_SIZE +        \
+                             RADIX_PUD_INDEX_SIZE + RADIX_PGD_INDEX_SIZE + PAGE_SHIFT)
+#define RADIX_PGTABLE_RANGE (ASM_CONST(1) << RADIX_PGTABLE_EADDR_SIZE)
+
+#ifndef __ASSEMBLY__
+#define RADIX_PTE_TABLE_SIZE   (sizeof(pte_t) << RADIX_PTE_INDEX_SIZE)
+#define RADIX_PMD_TABLE_SIZE   (sizeof(pmd_t) << RADIX_PMD_INDEX_SIZE)
+#define RADIX_PUD_TABLE_SIZE   (sizeof(pud_t) << RADIX_PUD_INDEX_SIZE)
+#define RADIX_PGD_TABLE_SIZE   (sizeof(pgd_t) << RADIX_PGD_INDEX_SIZE)
+
+static inline unsigned long radix__pte_update(struct mm_struct *mm,
+                                       unsigned long addr,
+                                       pte_t *ptep, unsigned long clr,
+                                       unsigned long set,
+                                       int huge)
+{
+       pte_t pte;
+       unsigned long old_pte, new_pte;
+
+       do {
+               pte = READ_ONCE(*ptep);
+               old_pte = pte_val(pte);
+               new_pte = (old_pte | set) & ~clr;
+
+       } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
+
+       /* We already do a sync in cmpxchg, is ptesync needed ?*/
+       asm volatile("ptesync" : : : "memory");
+       /* huge pages use the old page table lock */
+       if (!huge)
+               assert_pte_locked(mm, addr);
+
+       return old_pte;
+}
+
+/*
+ * Set the dirty and/or accessed bits atomically in a linux PTE, this
+ * function doesn't need to invalidate tlb.
+ */
+static inline void radix__ptep_set_access_flags(pte_t *ptep, pte_t entry)
+{
+       pte_t pte;
+       unsigned long old_pte, new_pte;
+       unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED |
+                                             _PAGE_RW | _PAGE_EXEC);
+       do {
+               pte = READ_ONCE(*ptep);
+               old_pte = pte_val(pte);
+               new_pte = old_pte | set;
+
+       } while (!pte_xchg(ptep, __pte(old_pte), __pte(new_pte)));
+
+       /* We already do a sync in cmpxchg, is ptesync needed ?*/
+       asm volatile("ptesync" : : : "memory");
+}
+
+static inline int radix__pte_same(pte_t pte_a, pte_t pte_b)
+{
+       return ((pte_raw(pte_a) ^ pte_raw(pte_b)) == 0);
+}
+
+static inline int radix__pte_none(pte_t pte)
+{
+       return (pte_val(pte) & ~RADIX_PTE_NONE_MASK) == 0;
+}
+
+static inline void radix__set_pte_at(struct mm_struct *mm, unsigned long addr,
+                                pte_t *ptep, pte_t pte, int percpu)
+{
+       *ptep = pte;
+       asm volatile("ptesync" : : : "memory");
+}
+
+static inline int radix__pmd_bad(pmd_t pmd)
+{
+       return !!(pmd_val(pmd) & RADIX_PMD_BAD_BITS);
+}
+
+static inline int radix__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
+{
+       return ((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) == 0);
+}
+
+static inline int radix__pud_bad(pud_t pud)
+{
+       return !!(pud_val(pud) & RADIX_PUD_BAD_BITS);
+}
+
+
+static inline int radix__pgd_bad(pgd_t pgd)
+{
+       return !!(pgd_val(pgd) & RADIX_PGD_BAD_BITS);
+}
+
+#endif /* __ASSEMBLY__ */
+#endif