[ARM] Introduce new PTE memory type bits

Provide L_PTE_MT_xxx definitions to describe the memory types that we
use in Linux/ARM.  These definitions are carefully picked such that:

1. their LSBs match what is required for pre-ARMv6 CPUs.
2. they all have a unique encoding, including after modification
   by build_mem_type_table() (the result being that some have more
   than one combination.)

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 32 insertions, 30 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index a713e40..cfc0add 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -68,27 +68,27 @@ static struct cachepolicy cache_policies[] __initdata = {
 		.policy		= "uncached",
 		.cr_mask	= CR_W|CR_C,
 		.pmd		= PMD_SECT_UNCACHED,
-		.pte		= 0,
+		.pte		= L_PTE_MT_UNCACHED,
 	}, {
 		.policy		= "buffered",
 		.cr_mask	= CR_C,
 		.pmd		= PMD_SECT_BUFFERED,
-		.pte		= PTE_BUFFERABLE,
+		.pte		= L_PTE_MT_BUFFERABLE,
 	}, {
 		.policy		= "writethrough",
 		.cr_mask	= 0,
 		.pmd		= PMD_SECT_WT,
-		.pte		= PTE_CACHEABLE,
+		.pte		= L_PTE_MT_WRITETHROUGH,
 	}, {
 		.policy		= "writeback",
 		.cr_mask	= 0,
 		.pmd		= PMD_SECT_WB,
-		.pte		= PTE_BUFFERABLE|PTE_CACHEABLE,
+		.pte		= L_PTE_MT_WRITEBACK,
 	}, {
 		.policy		= "writealloc",
 		.cr_mask	= 0,
 		.pmd		= PMD_SECT_WBWA,
-		.pte		= PTE_BUFFERABLE|PTE_CACHEABLE,
+		.pte		= L_PTE_MT_WRITEALLOC,
 	}
 };
 
@@ -186,35 +186,36 @@ void adjust_cr(unsigned long mask, unsigned long set)
 
 static struct mem_type mem_types[] = {
 	[MT_DEVICE] = {		  /* Strongly ordered / ARMv6 shared device */
-		.prot_pte	= PROT_PTE_DEVICE,
+		.prot_pte	= PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED |
+				  L_PTE_SHARED,
 		.prot_l1	= PMD_TYPE_TABLE,
 		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_UNCACHED,
 		.domain		= DOMAIN_IO,
 	},
 	[MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
-		.prot_pte	= PROT_PTE_DEVICE,
+		.prot_pte	= PROT_PTE_DEVICE | L_PTE_MT_DEV_NONSHARED,
 		.prot_pte_ext	= PTE_EXT_TEX(2),
 		.prot_l1	= PMD_TYPE_TABLE,
 		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_TEX(2),
 		.domain		= DOMAIN_IO,
 	},
 	[MT_DEVICE_CACHED] = {	  /* ioremap_cached */
-		.prot_pte	= PROT_PTE_DEVICE | L_PTE_CACHEABLE | L_PTE_BUFFERABLE,
+		.prot_pte	= PROT_PTE_DEVICE | L_PTE_MT_DEV_CACHED,
 		.prot_l1	= PMD_TYPE_TABLE,
 		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_WB,
 		.domain		= DOMAIN_IO,
 	},	
 	[MT_DEVICE_IXP2000] = {	  /* IXP2400 requires XCB=101 for on-chip I/O */
-		.prot_pte	= PROT_PTE_DEVICE,
+		.prot_pte	= PROT_PTE_DEVICE | L_PTE_MT_DEV_IXP2000,
 		.prot_l1	= PMD_TYPE_TABLE,
 		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_BUFFERABLE |
 				  PMD_SECT_TEX(1),
 		.domain		= DOMAIN_IO,
 	},
 	[MT_DEVICE_WC] = {	/* ioremap_wc */
-		.prot_pte	= PROT_PTE_DEVICE,
+		.prot_pte	= PROT_PTE_DEVICE | L_PTE_MT_DEV_WC,
 		.prot_l1	= PMD_TYPE_TABLE,
-		.prot_sect	= PROT_SECT_DEVICE,
+		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_BUFFERABLE,
 		.domain		= DOMAIN_IO,
 	},
 	[MT_CACHECLEAN] = {
@@ -259,7 +260,7 @@ static void __init build_mem_type_table(void)
 {
 	struct cachepolicy *cp;
 	unsigned int cr = get_cr();
-	unsigned int user_pgprot, kern_pgprot;
+	unsigned int user_pgprot, kern_pgprot, vecs_pgprot;
 	int cpu_arch = cpu_architecture();
 	int i;
 
@@ -277,6 +278,9 @@ static void __init build_mem_type_table(void)
 			cachepolicy = CPOLICY_WRITEBACK;
 		ecc_mask = 0;
 	}
+#ifdef CONFIG_SMP
+	cachepolicy = CPOLICY_WRITEALLOC;
+#endif
 
 	/*
 	 * On non-Xscale3 ARMv5-and-older systems, use CB=01
@@ -286,10 +290,9 @@ static void __init build_mem_type_table(void)
 	 */
 	if (cpu_is_xsc3() || cpu_arch >= CPU_ARCH_ARMv6) {
 		mem_types[MT_DEVICE_WC].prot_pte_ext |= PTE_EXT_TEX(1);
+		mem_types[MT_DEVICE_WC].prot_pte &= ~L_PTE_BUFFERABLE;
 		mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
-	} else {
-		mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_BUFFERABLE;
-		mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+		mem_types[MT_DEVICE_WC].prot_sect &= ~PMD_SECT_BUFFERABLE;
 	}
 
 	/*
@@ -312,7 +315,15 @@ static void __init build_mem_type_table(void)
 	}
 
 	cp = &cache_policies[cachepolicy];
-	kern_pgprot = user_pgprot = cp->pte;
+	vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
+
+#ifndef CONFIG_SMP
+	/*
+	 * Only use write-through for non-SMP systems
+	 */
+	if (cpu_arch >= CPU_ARCH_ARMv5 && cachepolicy > CPOLICY_WRITETHROUGH)
+		vecs_pgprot = cache_policies[CPOLICY_WRITETHROUGH].pte;
+#endif
 
 	/*
 	 * Enable CPU-specific coherency if supported.
@@ -349,30 +360,21 @@ static void __init build_mem_type_table(void)
 		 */
 		user_pgprot |= L_PTE_SHARED;
 		kern_pgprot |= L_PTE_SHARED;
+		vecs_pgprot |= L_PTE_SHARED;
 		mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
 #endif
 	}
 
 	for (i = 0; i < 16; i++) {
 		unsigned long v = pgprot_val(protection_map[i]);
-		v = (v & ~(L_PTE_BUFFERABLE|L_PTE_CACHEABLE)) | user_pgprot;
-		protection_map[i] = __pgprot(v);
+		protection_map[i] = __pgprot(v | user_pgprot);
 	}
 
-	mem_types[MT_LOW_VECTORS].prot_pte |= kern_pgprot;
-	mem_types[MT_HIGH_VECTORS].prot_pte |= kern_pgprot;
+	mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot;
+	mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot;
 
-	if (cpu_arch >= CPU_ARCH_ARMv5) {
-#ifndef CONFIG_SMP
-		/*
-		 * Only use write-through for non-SMP systems
-		 */
-		mem_types[MT_LOW_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
-		mem_types[MT_HIGH_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
-#endif
-	} else {
+	if (cpu_arch < CPU_ARCH_ARMv5)
 		mem_types[MT_MINICLEAN].prot_sect &= ~PMD_SECT_TEX(1);
-	}
 
 	pgprot_user   = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | user_pgprot);
 	pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG |