powerpc/mm: Fix bug in pagetable cache cleanup with CONFIG_PPC_SUBPAGE_PROT

Commit a0668cdc154e54bf0c85182e0535eea237d53146 cleans up the handling
of kmem_caches for allocating various levels of pagetables.
Unfortunately, it conflicts badly with CONFIG_PPC_SUBPAGE_PROT, due to
the latter's cleverly hidden technique of adding some extra allocation
space to the top level page directory to store the extra information
it needs.

Since that extra allocation really doesn't fit into the cleaned up
page directory allocating scheme, this patch alters
CONFIG_PPC_SUBPAGE_PROT to instead allocate its struct
subpage_prot_table as part of the mm_context_t.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index 7514ec2f854010c8c9900425b55a71edb8961db6..9d9551840f4aedbd6fe8bd3a0dc3812c66ad7492 100644 (file)
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -373,6 +373,38 @@ extern void slb_set_size(u16 size);
 
 #ifndef __ASSEMBLY__
 
+#ifdef CONFIG_PPC_SUBPAGE_PROT
+/*
+ * For the sub-page protection option, we extend the PGD with one of
+ * these.  Basically we have a 3-level tree, with the top level being
+ * the protptrs array.  To optimize speed and memory consumption when
+ * only addresses < 4GB are being protected, pointers to the first
+ * four pages of sub-page protection words are stored in the low_prot
+ * array.
+ * Each page of sub-page protection words protects 1GB (4 bytes
+ * protects 64k).  For the 3-level tree, each page of pointers then
+ * protects 8TB.
+ */
+struct subpage_prot_table {
+       unsigned long maxaddr;  /* only addresses < this are protected */
+       unsigned int **protptrs[2];
+       unsigned int *low_prot[4];
+};
+
+#define SBP_L1_BITS            (PAGE_SHIFT - 2)
+#define SBP_L2_BITS            (PAGE_SHIFT - 3)
+#define SBP_L1_COUNT           (1 << SBP_L1_BITS)
+#define SBP_L2_COUNT           (1 << SBP_L2_BITS)
+#define SBP_L2_SHIFT           (PAGE_SHIFT + SBP_L1_BITS)
+#define SBP_L3_SHIFT           (SBP_L2_SHIFT + SBP_L2_BITS)
+
+extern void subpage_prot_free(struct mm_struct *mm);
+extern void subpage_prot_init_new_context(struct mm_struct *mm);
+#else
+static inline void subpage_prot_free(pgd_t *pgd) {}
+static inline void subpage_prot_init_new_context(struct mm_struct *mm) { }
+#endif /* CONFIG_PPC_SUBPAGE_PROT */
+
 typedef unsigned long mm_context_id_t;
 
 typedef struct {
@@ -386,6 +418,9 @@ typedef struct {
        u16 sllp;               /* SLB page size encoding */
 #endif
        unsigned long vdso_base;
+#ifdef CONFIG_PPC_SUBPAGE_PROT
+       struct subpage_prot_table spt;
+#endif /* CONFIG_PPC_SUBPAGE_PROT */
 } mm_context_t;
 
 

diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h
index 5c1cd73dafa839a3ca34d38bd69acb0a748d591b..605f5c5398d1d9e5acaecc32fd1cb2c27643acc4 100644 (file)
--- a/arch/powerpc/include/asm/pgalloc-64.h
+++ b/arch/powerpc/include/asm/pgalloc-64.h
@@ -28,10 +28,6 @@
  */
 #define MAX_PGTABLE_INDEX_SIZE 0xf
 
-#ifndef CONFIG_PPC_SUBPAGE_PROT
-static inline void subpage_prot_free(pgd_t *pgd) {}
-#endif
-
 extern struct kmem_cache *pgtable_cache[];
 #define PGT_CACHE(shift) (pgtable_cache[(shift)-1])
 
@@ -42,7 +38,6 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 
 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 {
-       subpage_prot_free(pgd);
        kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
 }
 

diff --git a/arch/powerpc/include/asm/pte-hash64-64k.h b/arch/powerpc/include/asm/pte-hash64-64k.h
index 82b72207c51c9113600ce8b8fc5297115623142c..c4490f9c67c476bbb673def3ac75bb6249f6b470 100644 (file)
--- a/arch/powerpc/include/asm/pte-hash64-64k.h
+++ b/arch/powerpc/include/asm/pte-hash64-64k.h
@@ -76,41 +76,4 @@
        remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE,                \
                        __pgprot(pgprot_val((prot)) | _PAGE_4K_PFN))
 
-
-#ifdef CONFIG_PPC_SUBPAGE_PROT
-/*
- * For the sub-page protection option, we extend the PGD with one of
- * these.  Basically we have a 3-level tree, with the top level being
- * the protptrs array.  To optimize speed and memory consumption when
- * only addresses < 4GB are being protected, pointers to the first
- * four pages of sub-page protection words are stored in the low_prot
- * array.
- * Each page of sub-page protection words protects 1GB (4 bytes
- * protects 64k).  For the 3-level tree, each page of pointers then
- * protects 8TB.
- */
-struct subpage_prot_table {
-       unsigned long maxaddr;  /* only addresses < this are protected */
-       unsigned int **protptrs[2];
-       unsigned int *low_prot[4];
-};
-
-#undef PGD_TABLE_SIZE
-#define PGD_TABLE_SIZE         ((sizeof(pgd_t) << PGD_INDEX_SIZE) + \
-                                sizeof(struct subpage_prot_table))
-
-#define SBP_L1_BITS            (PAGE_SHIFT - 2)
-#define SBP_L2_BITS            (PAGE_SHIFT - 3)
-#define SBP_L1_COUNT           (1 << SBP_L1_BITS)
-#define SBP_L2_COUNT           (1 << SBP_L2_BITS)
-#define SBP_L2_SHIFT           (PAGE_SHIFT + SBP_L1_BITS)
-#define SBP_L3_SHIFT           (SBP_L2_SHIFT + SBP_L2_BITS)
-
-extern void subpage_prot_free(pgd_t *pgd);
-
-static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd)
-{
-       return (struct subpage_prot_table *)(pgd + PTRS_PER_PGD);
-}
-#endif /* CONFIG_PPC_SUBPAGE_PROT */
 #endif /* __ASSEMBLY__ */

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 6810128aba305730f3a61ef4edd2fc2c49042c37..50f867d657dfd365de1f21f6bf3f7f6d762c4ccd 100644 (file)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -835,9 +835,9 @@ void demote_segment_4k(struct mm_struct *mm, unsigned long addr)
  * Result is 0: full permissions, _PAGE_RW: read-only,
  * _PAGE_USER or _PAGE_USER|_PAGE_RW: no access.
  */
-static int subpage_protection(pgd_t *pgdir, unsigned long ea)
+static int subpage_protection(struct mm_struct *mm, unsigned long ea)
 {
-       struct subpage_prot_table *spt = pgd_subpage_prot(pgdir);
+       struct subpage_prot_table *spt = &mm->context.spt;
        u32 spp = 0;
        u32 **sbpm, *sbpp;
 
@@ -865,7 +865,7 @@ static int subpage_protection(pgd_t *pgdir, unsigned long ea)
 }
 
 #else /* CONFIG_PPC_SUBPAGE_PROT */
-static inline int subpage_protection(pgd_t *pgdir, unsigned long ea)
+static inline int subpage_protection(struct mm_struct *mm, unsigned long ea)
 {
        return 0;
 }

diff --git a/arch/powerpc/mm/mmu_context_hash64.c b/arch/powerpc/mm/mmu_context_hash64.c
index b9e4cc2c2057e43bed991c06c4c9cc184bc6f3d2..b910d37aea1aa921b567b0d3a9054b76d9a22ec7 100644 (file)
--- a/arch/powerpc/mm/mmu_context_hash64.c
+++ b/arch/powerpc/mm/mmu_context_hash64.c
@@ -76,6 +76,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
         */
        if (slice_mm_new_context(mm))
                slice_set_user_psize(mm, mmu_virtual_psize);
+       subpage_prot_init_new_context(mm);
        mm->context.id = index;
 
        return 0;
@@ -92,5 +93,6 @@ EXPORT_SYMBOL_GPL(__destroy_context);
 void destroy_context(struct mm_struct *mm)
 {
        __destroy_context(mm->context.id);
+       subpage_prot_free(mm);
        mm->context.id = NO_CONTEXT;
 }

diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c
index 4cafc0c33d0ac8cb6353c2bd6272e881488a674b..a040b81e93bdd6b49d16b77e4c8b04b0281c7bc6 100644 (file)
--- a/arch/powerpc/mm/subpage-prot.c
+++ b/arch/powerpc/mm/subpage-prot.c
@@ -24,9 +24,9 @@
  * Also makes sure that the subpage_prot_table structure is
  * reinitialized for the next user.
  */
-void subpage_prot_free(pgd_t *pgd)
+void subpage_prot_free(struct mm_struct *mm)
 {
-       struct subpage_prot_table *spt = pgd_subpage_prot(pgd);
+       struct subpage_prot_table *spt = &mm->context.spt;
        unsigned long i, j, addr;
        u32 **p;
 
@@ -51,6 +51,13 @@ void subpage_prot_free(pgd_t *pgd)
        spt->maxaddr = 0;
 }
 
+void subpage_prot_init_new_context(struct mm_struct *mm)
+{
+       struct subpage_prot_table *spt = &mm->context.spt;
+
+       memset(spt, 0, sizeof(*spt));
+}
+
 static void hpte_flush_range(struct mm_struct *mm, unsigned long addr,
                             int npages)
 {
@@ -87,7 +94,7 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr,
 static void subpage_prot_clear(unsigned long addr, unsigned long len)
 {
        struct mm_struct *mm = current->mm;
-       struct subpage_prot_table *spt = pgd_subpage_prot(mm->pgd);
+       struct subpage_prot_table *spt = &mm->context.spt;
        u32 **spm, *spp;
        int i, nw;
        unsigned long next, limit;
@@ -136,7 +143,7 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len)
 long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map)
 {
        struct mm_struct *mm = current->mm;
-       struct subpage_prot_table *spt = pgd_subpage_prot(mm->pgd);
+       struct subpage_prot_table *spt = &mm->context.spt;
        u32 **spm, *spp;
        int i, nw;
        unsigned long next, limit;