efi/x86: Make fw_vendor, config_table and runtime sysfs nodes x86 specific

There is some code that exposes physical addresses of certain parts of
the EFI firmware implementation via sysfs nodes. These nodes are only
used on x86, and are of dubious value to begin with, so let's move
their handling into the x86 arch code.

Tested-by: Tony Luck <tony.luck@intel.com> # arch/ia64
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

arch/x86/include/asm/efi.h

@@ -10,6 +10,8 @@
 #include <asm/mmu_context.h>
 #include <linux/build_bug.h>
 
+extern unsigned long efi_fw_vendor, efi_config_table;
+
 /*
  * We map the EFI regions needed for runtime services non-contiguously,
  * with preserved alignment on virtual addresses starting from -4G down

arch/x86/kernel/kexec-bzimage64.c

@@ -141,8 +141,8 @@ prepare_add_efi_setup_data(struct boot_params *params,
 	struct setup_data *sd = (void *)params + efi_setup_data_offset;
 	struct efi_setup_data *esd = (void *)sd + sizeof(struct setup_data);
 
-	esd->fw_vendor = efi.fw_vendor;
-	esd->tables = efi.config_table;
+	esd->fw_vendor = efi_fw_vendor;
+	esd->tables = efi_config_table;
 	esd->smbios = efi.smbios;
 
 	sd->type = SETUP_EFI;

arch/x86/platform/efi/efi.c

@@ -59,6 +59,9 @@ static u64 efi_systab_phys __initdata;
 
 static unsigned long prop_phys = EFI_INVALID_TABLE_ADDR;
 static unsigned long uga_phys = EFI_INVALID_TABLE_ADDR;
+static unsigned long efi_runtime, efi_nr_tables;
+
+unsigned long efi_fw_vendor, efi_config_table;
 
 static const efi_config_table_type_t arch_tables[] __initconst = {
 	{EFI_PROPERTIES_TABLE_GUID, "PROP", &prop_phys},
@@ -78,9 +81,9 @@ static const unsigned long * const efi_tables[] = {
 #ifdef CONFIG_X86_UV
 	&uv_systab_phys,
 #endif
-	&efi.fw_vendor,
-	&efi.runtime,
-	&efi.config_table,
+	&efi_fw_vendor,
+	&efi_runtime,
+	&efi_config_table,
 	&efi.esrt,
 	&prop_phys,
 	&efi_mem_attr_table,
@@ -434,7 +437,7 @@ static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
 	void *config_tables;
 	int sz, ret;
 
-	if (efi.systab->nr_tables == 0)
+	if (efi_nr_tables == 0)
 		return 0;
 
 	if (efi_enabled(EFI_64BIT))
@@ -445,17 +448,16 @@ static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
 	/*
 	 * Let's see what config tables the firmware passed to us.
 	 */
-	config_tables = early_memremap(efi.systab->tables,
-				       efi.systab->nr_tables * sz);
+	config_tables = early_memremap(efi_config_table, efi_nr_tables * sz);
 	if (config_tables == NULL) {
 		pr_err("Could not map Configuration table!\n");
 		return -ENOMEM;
 	}
 
-	ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
+	ret = efi_config_parse_tables(config_tables, efi_nr_tables,
 				      arch_tables);
 
-	early_memunmap(config_tables, efi.systab->nr_tables * sz);
+	early_memunmap(config_tables, efi_nr_tables * sz);
 	return ret;
 }
 
@@ -474,11 +476,12 @@ void __init efi_init(void)
 	if (efi_systab_init(efi_systab_phys))
 		return;
 
-	efi.config_table = (unsigned long)efi.systab->tables;
-	efi.fw_vendor	 = (unsigned long)efi.systab->fw_vendor;
-	efi.runtime	 = (unsigned long)efi.systab->runtime;
+	efi_config_table = (unsigned long)efi.systab->tables;
+	efi_nr_tables    = efi.systab->nr_tables;
+	efi_fw_vendor    = (unsigned long)efi.systab->fw_vendor;
+	efi_runtime      = (unsigned long)efi.systab->runtime;
 
-	if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables))
+	if (efi_reuse_config(efi_config_table, efi_nr_tables))
 		return;
 
 	if (efi_config_init(arch_tables))
@@ -1023,3 +1026,36 @@ char *efi_systab_show_arch(char *str)
 		str += sprintf(str, "UGA=0x%lx\n", uga_phys);
 	return str;
 }
+
+#define EFI_FIELD(var) efi_ ## var
+
+#define EFI_ATTR_SHOW(name) \
+static ssize_t name##_show(struct kobject *kobj, \
+				struct kobj_attribute *attr, char *buf) \
+{ \
+	return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
+}
+
+EFI_ATTR_SHOW(fw_vendor);
+EFI_ATTR_SHOW(runtime);
+EFI_ATTR_SHOW(config_table);
+
+struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
+struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
+struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
+
+umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+	if (attr == &efi_attr_fw_vendor.attr) {
+		if (efi_enabled(EFI_PARAVIRT) ||
+				efi_fw_vendor == EFI_INVALID_TABLE_ADDR)
+			return 0;
+	} else if (attr == &efi_attr_runtime.attr) {
+		if (efi_runtime == EFI_INVALID_TABLE_ADDR)
+			return 0;
+	} else if (attr == &efi_attr_config_table.attr) {
+		if (efi_config_table == EFI_INVALID_TABLE_ADDR)
+			return 0;
+	}
+	return attr->mode;
+}

arch/x86/platform/efi/quirks.c

@@ -537,7 +537,7 @@ int __init efi_reuse_config(u64 tables, int nr_tables)
 		goto out_memremap;
 	}
 
-	for (i = 0; i < efi.systab->nr_tables; i++) {
+	for (i = 0; i < nr_tables; i++) {
 		efi_guid_t guid;
 
 		guid = ((efi_config_table_64_t *)p)->guid;

drivers/firmware/efi/arm-init.c

@@ -120,9 +120,6 @@ static int __init uefi_init(void)
 	retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
 					 arch_tables);
 
-	if (!retval)
-		efi.config_table = (unsigned long)efi.systab->tables;
-
 	early_memunmap(config_tables, table_size);
 out:
 	early_memunmap(efi.systab,  sizeof(efi_system_table_t));

drivers/firmware/efi/efi.c

@@ -39,9 +39,6 @@ struct efi __read_mostly efi = {
 	.acpi20			= EFI_INVALID_TABLE_ADDR,
 	.smbios			= EFI_INVALID_TABLE_ADDR,
 	.smbios3		= EFI_INVALID_TABLE_ADDR,
-	.fw_vendor		= EFI_INVALID_TABLE_ADDR,
-	.runtime		= EFI_INVALID_TABLE_ADDR,
-	.config_table		= EFI_INVALID_TABLE_ADDR,
 	.esrt			= EFI_INVALID_TABLE_ADDR,
 	.tpm_log		= EFI_INVALID_TABLE_ADDR,
 	.tpm_final_log		= EFI_INVALID_TABLE_ADDR,
@@ -142,55 +139,30 @@ static ssize_t systab_show(struct kobject *kobj,
 
 static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
 
-#define EFI_FIELD(var) efi.var
-
-#define EFI_ATTR_SHOW(name) \
-static ssize_t name##_show(struct kobject *kobj, \
-				struct kobj_attribute *attr, char *buf) \
-{ \
-	return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
-}
-
-EFI_ATTR_SHOW(fw_vendor);
-EFI_ATTR_SHOW(runtime);
-EFI_ATTR_SHOW(config_table);
-
 static ssize_t fw_platform_size_show(struct kobject *kobj,
 				     struct kobj_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
 }
 
-static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
-static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
-static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
+extern __weak struct kobj_attribute efi_attr_fw_vendor;
+extern __weak struct kobj_attribute efi_attr_runtime;
+extern __weak struct kobj_attribute efi_attr_config_table;
 static struct kobj_attribute efi_attr_fw_platform_size =
 	__ATTR_RO(fw_platform_size);
 
 static struct attribute *efi_subsys_attrs[] = {
 	&efi_attr_systab.attr,
+	&efi_attr_fw_platform_size.attr,
 	&efi_attr_fw_vendor.attr,
 	&efi_attr_runtime.attr,
 	&efi_attr_config_table.attr,
-	&efi_attr_fw_platform_size.attr,
 	NULL,
 };
 
-static umode_t efi_attr_is_visible(struct kobject *kobj,
-				   struct attribute *attr, int n)
+umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr,
+				   int n)
 {
-	if (attr == &efi_attr_fw_vendor.attr) {
-		if (efi_enabled(EFI_PARAVIRT) ||
-				efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
-			return 0;
-	} else if (attr == &efi_attr_runtime.attr) {
-		if (efi.runtime == EFI_INVALID_TABLE_ADDR)
-			return 0;
-	} else if (attr == &efi_attr_config_table.attr) {
-		if (efi.config_table == EFI_INVALID_TABLE_ADDR)
-			return 0;
-	}
-
 	return attr->mode;
 }
 

include/linux/efi.h

@@ -535,9 +535,6 @@ extern struct efi {
 	unsigned long acpi20;		/* ACPI table  (ACPI 2.0) */
 	unsigned long smbios;		/* SMBIOS table (32 bit entry point) */
 	unsigned long smbios3;		/* SMBIOS table (64 bit entry point) */
-	unsigned long fw_vendor;	/* fw_vendor */
-	unsigned long runtime;		/* runtime table */
-	unsigned long config_table;	/* config tables */
 	unsigned long esrt;		/* ESRT table */
 	unsigned long tpm_log;		/* TPM2 Event Log table */
 	unsigned long tpm_final_log;	/* TPM2 Final Events Log table */