ARM: 7950/1: mm: Fix stage-2 device memory attributes

commit 4d9c5b89cf3605bbc39c6e274351ff25f0d83e6a upstream.

The stage-2 memory attributes are distinct from the Hyp memory
attributes and the Stage-1 memory attributes.  We were using the stage-1
memory attributes for stage-2 mappings causing device mappings to be
mapped as normal memory.  Add the S2 equivalent defines for memory
attributes and fix the comments explaining the defines while at it.

Add a prot_pte_s2 field to the mem_type struct and fill out the field
for device mappings accordingly.

Cc: <stable@vger.kernel.org>	[3.12]
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h
index 5689c18c85f5ebafb95a9bb2cc99fda227992976..ceb4807ee8b213cd9a31b9b143cefde8c2dd8d1d 100644 (file)
--- a/arch/arm/include/asm/pgtable-3level.h
+++ b/arch/arm/include/asm/pgtable-3level.h
@@ -120,11 +120,14 @@
 /*
  * 2nd stage PTE definitions for LPAE.
  */
-#define L_PTE_S2_MT_UNCACHED    (_AT(pteval_t, 0x5) << 2) /* MemAttr[3:0] */
-#define L_PTE_S2_MT_WRITETHROUGH (_AT(pteval_t, 0xa) << 2) /* MemAttr[3:0] */
-#define L_PTE_S2_MT_WRITEBACK   (_AT(pteval_t, 0xf) << 2) /* MemAttr[3:0] */
-#define L_PTE_S2_RDONLY                 (_AT(pteval_t, 1) << 6)   /* HAP[1]   */
-#define L_PTE_S2_RDWR           (_AT(pteval_t, 3) << 6)   /* HAP[2:1] */
+#define L_PTE_S2_MT_UNCACHED           (_AT(pteval_t, 0x0) << 2) /* strongly ordered */
+#define L_PTE_S2_MT_WRITETHROUGH       (_AT(pteval_t, 0xa) << 2) /* normal inner write-through */
+#define L_PTE_S2_MT_WRITEBACK          (_AT(pteval_t, 0xf) << 2) /* normal inner write-back */
+#define L_PTE_S2_MT_DEV_SHARED         (_AT(pteval_t, 0x1) << 2) /* device */
+#define L_PTE_S2_MT_MASK               (_AT(pteval_t, 0xf) << 2)
+
+#define L_PTE_S2_RDONLY                        (_AT(pteval_t, 1) << 6)   /* HAP[1]   */
+#define L_PTE_S2_RDWR                  (_AT(pteval_t, 3) << 6)   /* HAP[2:1] */
 
 /*
  * Hyp-mode PL2 PTE definitions for LPAE.

diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h
index d5a4e9ad8f0f68549947100081e3b9f8ac2e1b3a..33eab618b3f180bc0a80c6e2c4b40aae26ee7f07 100644 (file)
--- a/arch/arm/mm/mm.h
+++ b/arch/arm/mm/mm.h
@@ -38,6 +38,7 @@ static inline pmd_t *pmd_off_k(unsigned long virt)
 
 struct mem_type {
        pteval_t prot_pte;
+       pteval_t prot_pte_s2;
        pmdval_t prot_l1;
        pmdval_t prot_sect;
        unsigned int domain;

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index b1d17eeb59b895cd429e762d082d6c5c56c3ff57..0222ba7603afde01301f09af9a3891b53cfb962d 100644 (file)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -229,12 +229,16 @@ __setup("noalign", noalign_setup);
 #endif /* ifdef CONFIG_CPU_CP15 / else */
 
 #define PROT_PTE_DEVICE                L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_XN
+#define PROT_PTE_S2_DEVICE     PROT_PTE_DEVICE
 #define PROT_SECT_DEVICE       PMD_TYPE_SECT|PMD_SECT_AP_WRITE
 
 static struct mem_type mem_types[] = {
        [MT_DEVICE] = {           /* Strongly ordered / ARMv6 shared device */
                .prot_pte       = PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED |
                                  L_PTE_SHARED,
+               .prot_pte_s2    = s2_policy(PROT_PTE_S2_DEVICE) |
+                                 s2_policy(L_PTE_S2_MT_DEV_SHARED) |
+                                 L_PTE_SHARED,
                .prot_l1        = PMD_TYPE_TABLE,
                .prot_sect      = PROT_SECT_DEVICE | PMD_SECT_S,
                .domain         = DOMAIN_IO,
@@ -456,7 +460,8 @@ static void __init build_mem_type_table(void)
        cp = &cache_policies[cachepolicy];
        vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
        s2_pgprot = cp->pte_s2;
-       hyp_device_pgprot = s2_device_pgprot = mem_types[MT_DEVICE].prot_pte;
+       hyp_device_pgprot = mem_types[MT_DEVICE].prot_pte;
+       s2_device_pgprot = mem_types[MT_DEVICE].prot_pte_s2;
 
        /*
         * ARMv6 and above have extended page tables.