[PATCH v2 05/12] arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM

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This refactors the EFI init and runtime code that will be shared
between arm64 and ARM so that it can be built for both archs.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
 arch/arm64/include/asm/efi.h       | 16 ++++++
 arch/arm64/kernel/efi.c            | 27 +++++++++
 drivers/firmware/efi/arm-init.c    |  7 ++-
 drivers/firmware/efi/arm-runtime.c | 60 ++++++--------------
 drivers/firmware/efi/efi.c         |  2 +
 5 files changed, 66 insertions(+), 46 deletions(-)

diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index ef572206f1c3..1ae6f635dc2c 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h
@@ -2,7 +2,9 @@
 #define _ASM_EFI_H
 
 #include <asm/io.h>
+#include <asm/mmu_context.h>
 #include <asm/neon.h>
+#include <asm/tlbflush.h>
 
 #ifdef CONFIG_EFI
 extern void efi_init(void);
@@ -10,6 +12,8 @@ extern void efi_init(void);
 #define efi_init()
 #endif
 
+int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
+
 #define efi_call_virt(f, ...)						\
 ({									\
 	efi_##f##_t *__f;						\
@@ -63,6 +67,18 @@ extern void efi_init(void);
  *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
  */
 
+static inline void efi_set_pgd(struct mm_struct *mm)
+{
+	if (mm == &init_mm)
+		cpu_set_reserved_ttbr0();
+	else
+		cpu_switch_mm(mm->pgd, mm);
+
+	flush_tlb_all();
+	if (icache_is_aivivt())
+		__flush_icache_all();
+}
+
 void efi_virtmap_load(void);
 void efi_virtmap_unload(void);
 
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index bd3b2f5adf0c..1e62b5f036c1 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -17,6 +17,33 @@
 
 #include <asm/efi.h>
 
+int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
+{
+	u64 paddr, npages, size;
+	pteval_t prot_val;
+
+	paddr = md->phys_addr;
+	npages = md->num_pages;
+	memrange_efi_to_native(&paddr, &npages);
+	size = npages << PAGE_SHIFT;
+
+	/*
+	 * Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
+	 * executable, everything else can be mapped with the XN bits
+	 * set.
+	 */
+	if ((md->attribute & EFI_MEMORY_WB) == 0)
+		prot_val = PROT_DEVICE_nGnRE;
+	else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
+		 !PAGE_ALIGNED(md->phys_addr))
+		prot_val = pgprot_val(PAGE_KERNEL_EXEC);
+	else
+		prot_val = pgprot_val(PAGE_KERNEL);
+
+	create_pgd_mapping(mm, paddr, md->virt_addr, size, __pgprot(prot_val));
+	return 0;
+}
+
 static int __init arm64_dmi_init(void)
 {
 	/*
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index 4653d789f10d..11de5cf210c4 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -57,7 +57,7 @@ static int __init uefi_init(void)
 {
 	efi_char16_t *c16;
 	void *config_tables;
-	u64 table_size;
+	size_t table_size;
 	char vendor[100] = "unknown";
 	int i, retval;
 
@@ -69,7 +69,8 @@ static int __init uefi_init(void)
 	}
 
 	set_bit(EFI_BOOT, &efi.flags);
-	set_bit(EFI_64BIT, &efi.flags);
+	if (IS_ENABLED(CONFIG_64BIT))
+		set_bit(EFI_64BIT, &efi.flags);
 
 	/*
 	 * Verify the EFI Table
@@ -103,7 +104,7 @@ static int __init uefi_init(void)
 				       table_size);
 
 	retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
-					 sizeof(efi_config_table_64_t), NULL);
+					 sizeof(efi_config_table_t), NULL);
 
 	early_memunmap(config_tables, table_size);
 out:
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index e62ee5df96ca..ad11ba6964f6 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -23,18 +23,15 @@
 
 #include <asm/cacheflush.h>
 #include <asm/efi.h>
-#include <asm/tlbflush.h>
-#include <asm/mmu_context.h>
+#include <asm/io.h>
 #include <asm/mmu.h>
+#include <asm/pgalloc.h>
 #include <asm/pgtable.h>
 
-static pgd_t efi_pgd[PTRS_PER_PGD] __page_aligned_bss;
-
 extern u64 efi_system_table;
 
 static struct mm_struct efi_mm = {
 	.mm_rb			= RB_ROOT,
-	.pgd			= efi_pgd,
 	.mm_users		= ATOMIC_INIT(2),
 	.mm_count		= ATOMIC_INIT(1),
 	.mmap_sem		= __RWSEM_INITIALIZER(efi_mm.mmap_sem),
@@ -46,37 +43,26 @@ static bool __init efi_virtmap_init(void)
 {
 	efi_memory_desc_t *md;
 
+	efi_mm.pgd = pgd_alloc(&efi_mm);
+
 	for_each_efi_memory_desc(&memmap, md) {
-		u64 paddr, npages, size;
-		pgprot_t prot;
+		phys_addr_t phys = (phys_addr_t)md->phys_addr;
+		int ret;
 
 		if (!(md->attribute & EFI_MEMORY_RUNTIME))
 			continue;
 		if (md->virt_addr == 0)
 			return false;
 
-		paddr = md->phys_addr;
-		npages = md->num_pages;
-		memrange_efi_to_native(&paddr, &npages);
-		size = npages << PAGE_SHIFT;
-
-		pr_info("  EFI remap 0x%016llx => %p\n",
-			md->phys_addr, (void *)md->virt_addr);
-
-		/*
-		 * Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
-		 * executable, everything else can be mapped with the XN bits
-		 * set.
-		 */
-		if ((md->attribute & EFI_MEMORY_WB) == 0)
-			prot = __pgprot(PROT_DEVICE_nGnRE);
-		else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
-			 !PAGE_ALIGNED(md->phys_addr))
-			prot = PAGE_KERNEL_EXEC;
-		else
-			prot = PAGE_KERNEL;
-
-		create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, prot);
+		ret = efi_create_mapping(&efi_mm, md);
+		if  (!ret) {
+			pr_info("  EFI remap %pa => %p\n",
+				&phys, (void *)(unsigned long)md->virt_addr);
+		} else {
+			pr_warn("  EFI remap %pa: failed to create mapping (%d)\n",
+				&phys, ret);
+			return false;
+		}
 	}
 	return true;
 }
@@ -86,7 +72,7 @@ static bool __init efi_virtmap_init(void)
  * non-early mapping of the UEFI system table and virtual mappings for all
  * EFI_MEMORY_RUNTIME regions.
  */
-static int __init arm64_enable_runtime_services(void)
+static int __init arm_enable_runtime_services(void)
 {
 	u64 mapsize;
 
@@ -133,19 +119,7 @@ static int __init arm64_enable_runtime_services(void)
 
 	return 0;
 }
-early_initcall(arm64_enable_runtime_services);
-
-static void efi_set_pgd(struct mm_struct *mm)
-{
-	if (mm == &init_mm)
-		cpu_set_reserved_ttbr0();
-	else
-		cpu_switch_mm(mm->pgd, mm);
-
-	flush_tlb_all();
-	if (icache_is_aivivt())
-		__flush_icache_all();
-}
+early_initcall(arm_enable_runtime_services);
 
 void efi_virtmap_load(void)
 {
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 027ca212179f..cffa89b3317b 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -25,6 +25,8 @@
 #include <linux/io.h>
 #include <linux/platform_device.h>
 
+#include <asm/efi.h>
+
 struct efi __read_mostly efi = {
 	.mps			= EFI_INVALID_TABLE_ADDR,
 	.acpi			= EFI_INVALID_TABLE_ADDR,
-- 
1.9.1

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