treewide: Add a function to change page permissions

For armv8 we are adding proper page permissions for the relocated U-Boot
binary. Add a weak function that can be used across architectures to change
the page permissions

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on AML-S905X-CC
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

arch/arc/lib/cache.c

@@ -8,6 +8,7 @@
 #include <asm/global_data.h>
 #include <linux/bitops.h>
 #include <linux/compiler.h>
+#include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/log2.h>
 #include <asm/arcregs.h>
@@ -819,3 +820,8 @@ void sync_n_cleanup_cache_all(void)
 
 	__ic_entire_invalidate();
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/arm/cpu/arm926ejs/cache.c

@@ -5,6 +5,7 @@
  */
 #include <cpu_func.h>
 #include <asm/cache.h>
+#include <linux/errno.h>
 #include <linux/types.h>
 
 #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
@@ -88,3 +89,8 @@ void enable_caches(void)
 	dcache_enable();
 #endif
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/arm/cpu/armv7/cache_v7.c

@@ -6,6 +6,7 @@
  */
 #include <cpu_func.h>
 #include <asm/cache.h>
+#include <linux/errno.h>
 #include <linux/types.h>
 #include <asm/armv7.h>
 #include <asm/utils.h>
@@ -209,3 +210,8 @@ __weak void v7_outer_cache_flush_all(void) {}
 __weak void v7_outer_cache_inval_all(void) {}
 __weak void v7_outer_cache_flush_range(u32 start, u32 end) {}
 __weak void v7_outer_cache_inval_range(u32 start, u32 end) {}
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/arm/cpu/armv7m/cache.c

@@ -11,6 +11,7 @@
 #include <asm/cache.h>
 #include <asm/io.h>
 #include <linux/bitops.h>
+#include <linux/errno.h>
 
 /* Cache maintenance operation registers */
 
@@ -370,3 +371,8 @@ void enable_caches(void)
 	dcache_enable();
 #endif
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/arm/cpu/armv8/cache_v8.c

@@ -14,6 +14,7 @@
 #include <asm/global_data.h>
 #include <asm/system.h>
 #include <asm/armv8/mmu.h>
+#include <linux/errno.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -1032,6 +1033,30 @@ void mmu_change_region_attr(phys_addr_t addr, size_t siz, u64 attrs)
 	mmu_change_region_attr_nobreak(addr, siz, attrs);
 }
 
+int pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	u64 attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE | PTE_TYPE_VALID;
+
+	switch (perm) {
+	case MMU_ATTR_RO:
+		attrs |= PTE_BLOCK_PXN | PTE_BLOCK_UXN | PTE_BLOCK_RO;
+		break;
+	case MMU_ATTR_RX:
+		attrs |= PTE_BLOCK_RO;
+		break;
+	case MMU_ATTR_RW:
+		attrs |= PTE_BLOCK_PXN | PTE_BLOCK_UXN;
+		break;
+	default:
+		log_err("Unknown attribute %d\n", perm);
+		return -EINVAL;
+	}
+
+	mmu_change_region_attr_nobreak(addr, size, attrs);
+
+	return 0;
+}
+
 #else	/* !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
 
 /*

arch/arm/lib/cache.c

@@ -10,6 +10,7 @@
 #include <malloc.h>
 #include <asm/cache.h>
 #include <asm/global_data.h>
+#include <linux/errno.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -170,3 +171,8 @@ __weak int arm_reserve_mmu(void)
 
 	return 0;
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/m68k/lib/cache.c

@@ -8,6 +8,7 @@
 #include <cpu_func.h>
 #include <asm/immap.h>
 #include <asm/cache.h>
+#include <linux/errno.h>
 
 volatile int *cf_icache_status = (int *)ICACHE_STATUS;
 volatile int *cf_dcache_status = (int *)DCACHE_STATUS;
@@ -151,3 +152,8 @@ __weak void flush_dcache_range(unsigned long start, unsigned long stop)
 {
 	/* An empty stub, real implementation should be in platform code */
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/nios2/lib/cache.c

@@ -8,6 +8,7 @@
 #include <cpu_func.h>
 #include <asm/cache.h>
 #include <asm/global_data.h>
+#include <linux/errno.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -127,3 +128,8 @@ void dcache_disable(void)
 {
 	flush_dcache_all();
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/powerpc/lib/cache.c

@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <asm/cache.h>
 #include <watchdog.h>
+#include <linux/errno.h>
 
 static ulong maybe_watchdog_reset(ulong flushed)
 {
@@ -58,3 +59,8 @@ void invalidate_icache_all(void)
 {
 	puts("No arch specific invalidate_icache_all available!\n");
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/riscv/lib/cache.c

@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <asm/insn-def.h>
 #include <linux/const.h>
+#include <linux/errno.h>
 
 #define CBO_INVAL(base)						\
 	INSN_I(OPCODE_MISC_MEM, FUNC3(2), __RD(0),		\
@@ -151,3 +152,8 @@ __weak void enable_caches(void)
 	if (!zicbom_block_size)
 		log_debug("Zicbom not initialized.\n");
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/sh/cpu/sh4/cache.c

@@ -11,6 +11,7 @@
 #include <asm/io.h>
 #include <asm/processor.h>
 #include <asm/system.h>
+#include <linux/errno.h>
 
 #define CACHE_VALID       1
 #define CACHE_UPDATED     2
@@ -126,3 +127,8 @@ int dcache_status(void)
 {
 	return 0;
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

arch/xtensa/lib/cache.c

@@ -6,6 +6,7 @@
 
 #include <cpu_func.h>
 #include <asm/cache.h>
+#include <linux/errno.h>
 
 /*
  * We currently run always with caches enabled when running from memory.
@@ -57,3 +58,8 @@ void invalidate_icache_all(void)
 {
 	__invalidate_icache_all();
 }
+
+int __weak pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm)
+{
+	return -ENOSYS;
+}

include/cpu_func.h

@@ -69,6 +69,23 @@ void flush_dcache_range(unsigned long start, unsigned long stop);
 void invalidate_dcache_range(unsigned long start, unsigned long stop);
 void invalidate_dcache_all(void);
 void invalidate_icache_all(void);
+
+enum pgprot_attrs {
+	MMU_ATTR_RO,
+	MMU_ATTR_RX,
+	MMU_ATTR_RW,
+};
+
+/** pgprot_set_attrs() - Set page table permissions
+ *
+ * @addr: Physical address start
+ * @size: size of memory to change
+ * @perm: New permissions
+ *
+ * Return: 0 on success, error otherwise.
+ **/
+int pgprot_set_attrs(phys_addr_t addr, size_t size, enum pgprot_attrs perm);
+
 /**
  * noncached_init() - Initialize non-cached memory region
  *