Commit b8dbf730 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull EFI updates from Ingo Molnar:
 "The biggest change in this cycle was the addition of ARM CPER error
  decoding when printing EFI errors into the kernel log.

  There are also misc smaller updates: documentation update, cleanups
  and an EFI memory map permissions quirk"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/efi: Clarify that reset attack mitigation needs appropriate userspace
  efi: Parse ARM error information value
  efi: Move ARM CPER code to new file
  efi: Use PTR_ERR_OR_ZERO()
  arm64/efi: Ignore EFI_MEMORY_XP attribute if RP and/or WP are set
  efi/capsule-loader: Fix pr_err() string to end with newline
parents d7727946 a5c03c31

arch/arm64/kernel/efi.c

+3 −1
Original line number Diff line number Diff line
@@ -48,7 +48,9 @@ static __init pteval_t create_mapping_protection(efi_memory_desc_t *md) 
		return pgprot_val(PAGE_KERNEL_ROX);



	/* RW- */

	if (attr & EFI_MEMORY_XP || type != EFI_RUNTIME_SERVICES_CODE)

	if (((attr & (EFI_MEMORY_RP | EFI_MEMORY_WP | EFI_MEMORY_XP)) ==

	     EFI_MEMORY_XP) ||

	    type != EFI_RUNTIME_SERVICES_CODE)

		return pgprot_val(PAGE_KERNEL);



	/* RWX */

drivers/firmware/efi/Kconfig

+9 −1
Original line number Diff line number Diff line
@@ -159,13 +159,21 @@ config RESET_ATTACK_MITIGATION 
	  using the TCG Platform Reset Attack Mitigation specification. This

	  protects against an attacker forcibly rebooting the system while it

	  still contains secrets in RAM, booting another OS and extracting the

	  secrets.

	  secrets. This should only be enabled when userland is configured to

	  clear the MemoryOverwriteRequest flag on clean shutdown after secrets

	  have been evicted, since otherwise it will trigger even on clean

	  reboots.



endmenu



config UEFI_CPER

	bool



config UEFI_CPER_ARM

	bool

	depends on UEFI_CPER && ( ARM || ARM64 )

	default y



config EFI_DEV_PATH_PARSER

	bool

	depends on ACPI

drivers/firmware/efi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -30,3 +30,4 @@ arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o 
obj-$(CONFIG_ARM)			+= $(arm-obj-y)

obj-$(CONFIG_ARM64)			+= $(arm-obj-y)

obj-$(CONFIG_EFI_CAPSULE_LOADER)	+= capsule-loader.o

obj-$(CONFIG_UEFI_CPER_ARM)		+= cper-arm.o

drivers/firmware/efi/capsule-loader.c

+1 −1
Original line number Diff line number Diff line
@@ -45,7 +45,7 @@ int __efi_capsule_setup_info(struct capsule_info *cap_info) 
	pages_needed = ALIGN(cap_info->total_size, PAGE_SIZE) / PAGE_SIZE;



	if (pages_needed == 0) {

		pr_err("invalid capsule size");

		pr_err("invalid capsule size\n");

		return -EINVAL;

	}

drivers/firmware/efi/cper-arm.c

0 → 100644
+356 −0
Original line number Diff line number Diff line 
/*

 * UEFI Common Platform Error Record (CPER) support

 *

 * Copyright (C) 2017, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License version

 * 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/time.h>

#include <linux/cper.h>

#include <linux/dmi.h>

#include <linux/acpi.h>

#include <linux/pci.h>

#include <linux/aer.h>

#include <linux/printk.h>

#include <linux/bcd.h>

#include <acpi/ghes.h>

#include <ras/ras_event.h>



#define INDENT_SP	" "



static const char * const arm_reg_ctx_strs[] = {

	"AArch32 general purpose registers",

	"AArch32 EL1 context registers",

	"AArch32 EL2 context registers",

	"AArch32 secure context registers",

	"AArch64 general purpose registers",

	"AArch64 EL1 context registers",

	"AArch64 EL2 context registers",

	"AArch64 EL3 context registers",

	"Misc. system register structure",

};



static const char * const arm_err_trans_type_strs[] = {

	"Instruction",

	"Data Access",

	"Generic",

};



static const char * const arm_bus_err_op_strs[] = {

	"Generic error (type cannot be determined)",

	"Generic read (type of instruction or data request cannot be determined)",

	"Generic write (type of instruction of data request cannot be determined)",

	"Data read",

	"Data write",

	"Instruction fetch",

	"Prefetch",

};



static const char * const arm_cache_err_op_strs[] = {

	"Generic error (type cannot be determined)",

	"Generic read (type of instruction or data request cannot be determined)",

	"Generic write (type of instruction of data request cannot be determined)",

	"Data read",

	"Data write",

	"Instruction fetch",

	"Prefetch",

	"Eviction",

	"Snooping (processor initiated a cache snoop that resulted in an error)",

	"Snooped (processor raised a cache error caused by another processor or device snooping its cache)",

	"Management",

};



static const char * const arm_tlb_err_op_strs[] = {

	"Generic error (type cannot be determined)",

	"Generic read (type of instruction or data request cannot be determined)",

	"Generic write (type of instruction of data request cannot be determined)",

	"Data read",

	"Data write",

	"Instruction fetch",

	"Prefetch",

	"Local management operation (processor initiated a TLB management operation that resulted in an error)",

	"External management operation (processor raised a TLB error caused by another processor or device broadcasting TLB operations)",

};



static const char * const arm_bus_err_part_type_strs[] = {

	"Local processor originated request",

	"Local processor responded to request",

	"Local processor observed",

	"Generic",

};



static const char * const arm_bus_err_addr_space_strs[] = {

	"External Memory Access",

	"Internal Memory Access",

	"Unknown",

	"Device Memory Access",

};



static void cper_print_arm_err_info(const char *pfx, u32 type,

				    u64 error_info)

{

	u8 trans_type, op_type, level, participation_type, address_space;

	u16 mem_attributes;

	bool proc_context_corrupt, corrected, precise_pc, restartable_pc;

	bool time_out, access_mode;



	/* If the type is unknown, bail. */

	if (type > CPER_ARM_MAX_TYPE)

		return;



	/*

	 * Vendor type errors have error information values that are vendor

	 * specific.

	 */

	if (type == CPER_ARM_VENDOR_ERROR)

		return;



	if (error_info & CPER_ARM_ERR_VALID_TRANSACTION_TYPE) {

		trans_type = ((error_info >> CPER_ARM_ERR_TRANSACTION_SHIFT)

			      & CPER_ARM_ERR_TRANSACTION_MASK);

		if (trans_type < ARRAY_SIZE(arm_err_trans_type_strs)) {

			printk("%stransaction type: %s\n", pfx,

			       arm_err_trans_type_strs[trans_type]);

		}

	}



	if (error_info & CPER_ARM_ERR_VALID_OPERATION_TYPE) {

		op_type = ((error_info >> CPER_ARM_ERR_OPERATION_SHIFT)

			   & CPER_ARM_ERR_OPERATION_MASK);

		switch (type) {

		case CPER_ARM_CACHE_ERROR:

			if (op_type < ARRAY_SIZE(arm_cache_err_op_strs)) {

				printk("%soperation type: %s\n", pfx,

				       arm_cache_err_op_strs[op_type]);

			}

			break;

		case CPER_ARM_TLB_ERROR:

			if (op_type < ARRAY_SIZE(arm_tlb_err_op_strs)) {

				printk("%soperation type: %s\n", pfx,

				       arm_tlb_err_op_strs[op_type]);

			}

			break;

		case CPER_ARM_BUS_ERROR:

			if (op_type < ARRAY_SIZE(arm_bus_err_op_strs)) {

				printk("%soperation type: %s\n", pfx,

				       arm_bus_err_op_strs[op_type]);

			}

			break;

		}

	}



	if (error_info & CPER_ARM_ERR_VALID_LEVEL) {

		level = ((error_info >> CPER_ARM_ERR_LEVEL_SHIFT)

			 & CPER_ARM_ERR_LEVEL_MASK);

		switch (type) {

		case CPER_ARM_CACHE_ERROR:

			printk("%scache level: %d\n", pfx, level);

			break;

		case CPER_ARM_TLB_ERROR:

			printk("%sTLB level: %d\n", pfx, level);

			break;

		case CPER_ARM_BUS_ERROR:

			printk("%saffinity level at which the bus error occurred: %d\n",

			       pfx, level);

			break;

		}

	}



	if (error_info & CPER_ARM_ERR_VALID_PROC_CONTEXT_CORRUPT) {

		proc_context_corrupt = ((error_info >> CPER_ARM_ERR_PC_CORRUPT_SHIFT)

					& CPER_ARM_ERR_PC_CORRUPT_MASK);

		if (proc_context_corrupt)

			printk("%sprocessor context corrupted\n", pfx);

		else

			printk("%sprocessor context not corrupted\n", pfx);

	}



	if (error_info & CPER_ARM_ERR_VALID_CORRECTED) {

		corrected = ((error_info >> CPER_ARM_ERR_CORRECTED_SHIFT)

			     & CPER_ARM_ERR_CORRECTED_MASK);

		if (corrected)

			printk("%sthe error has been corrected\n", pfx);

		else

			printk("%sthe error has not been corrected\n", pfx);

	}



	if (error_info & CPER_ARM_ERR_VALID_PRECISE_PC) {

		precise_pc = ((error_info >> CPER_ARM_ERR_PRECISE_PC_SHIFT)

			      & CPER_ARM_ERR_PRECISE_PC_MASK);

		if (precise_pc)

			printk("%sPC is precise\n", pfx);

		else

			printk("%sPC is imprecise\n", pfx);

	}



	if (error_info & CPER_ARM_ERR_VALID_RESTARTABLE_PC) {

		restartable_pc = ((error_info >> CPER_ARM_ERR_RESTARTABLE_PC_SHIFT)

				  & CPER_ARM_ERR_RESTARTABLE_PC_MASK);

		if (restartable_pc)

			printk("%sProgram execution can be restarted reliably at the PC associated with the error.\n", pfx);

	}



	/* The rest of the fields are specific to bus errors */

	if (type != CPER_ARM_BUS_ERROR)

		return;



	if (error_info & CPER_ARM_ERR_VALID_PARTICIPATION_TYPE) {

		participation_type = ((error_info >> CPER_ARM_ERR_PARTICIPATION_TYPE_SHIFT)

				      & CPER_ARM_ERR_PARTICIPATION_TYPE_MASK);

		if (participation_type < ARRAY_SIZE(arm_bus_err_part_type_strs)) {

			printk("%sparticipation type: %s\n", pfx,

			       arm_bus_err_part_type_strs[participation_type]);

		}

	}



	if (error_info & CPER_ARM_ERR_VALID_TIME_OUT) {

		time_out = ((error_info >> CPER_ARM_ERR_TIME_OUT_SHIFT)

			    & CPER_ARM_ERR_TIME_OUT_MASK);

		if (time_out)

			printk("%srequest timed out\n", pfx);

	}



	if (error_info & CPER_ARM_ERR_VALID_ADDRESS_SPACE) {

		address_space = ((error_info >> CPER_ARM_ERR_ADDRESS_SPACE_SHIFT)

				 & CPER_ARM_ERR_ADDRESS_SPACE_MASK);

		if (address_space < ARRAY_SIZE(arm_bus_err_addr_space_strs)) {

			printk("%saddress space: %s\n", pfx,

			       arm_bus_err_addr_space_strs[address_space]);

		}

	}



	if (error_info & CPER_ARM_ERR_VALID_MEM_ATTRIBUTES) {

		mem_attributes = ((error_info >> CPER_ARM_ERR_MEM_ATTRIBUTES_SHIFT)

				  & CPER_ARM_ERR_MEM_ATTRIBUTES_MASK);

		printk("%smemory access attributes:0x%x\n", pfx, mem_attributes);

	}



	if (error_info & CPER_ARM_ERR_VALID_ACCESS_MODE) {

		access_mode = ((error_info >> CPER_ARM_ERR_ACCESS_MODE_SHIFT)

			       & CPER_ARM_ERR_ACCESS_MODE_MASK);

		if (access_mode)

			printk("%saccess mode: normal\n", pfx);

		else

			printk("%saccess mode: secure\n", pfx);

	}

}



void cper_print_proc_arm(const char *pfx,

			 const struct cper_sec_proc_arm *proc)

{

	int i, len, max_ctx_type;

	struct cper_arm_err_info *err_info;

	struct cper_arm_ctx_info *ctx_info;

	char newpfx[64], infopfx[64];



	printk("%sMIDR: 0x%016llx\n", pfx, proc->midr);



	len = proc->section_length - (sizeof(*proc) +

		proc->err_info_num * (sizeof(*err_info)));

	if (len < 0) {

		printk("%ssection length: %d\n", pfx, proc->section_length);

		printk("%ssection length is too small\n", pfx);

		printk("%sfirmware-generated error record is incorrect\n", pfx);

		printk("%sERR_INFO_NUM is %d\n", pfx, proc->err_info_num);

		return;

	}



	if (proc->validation_bits & CPER_ARM_VALID_MPIDR)

		printk("%sMultiprocessor Affinity Register (MPIDR): 0x%016llx\n",

			pfx, proc->mpidr);



	if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL)

		printk("%serror affinity level: %d\n", pfx,

			proc->affinity_level);



	if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) {

		printk("%srunning state: 0x%x\n", pfx, proc->running_state);

		printk("%sPower State Coordination Interface state: %d\n",

			pfx, proc->psci_state);

	}



	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);



	err_info = (struct cper_arm_err_info *)(proc + 1);

	for (i = 0; i < proc->err_info_num; i++) {

		printk("%sError info structure %d:\n", pfx, i);



		printk("%snum errors: %d\n", pfx, err_info->multiple_error + 1);



		if (err_info->validation_bits & CPER_ARM_INFO_VALID_FLAGS) {

			if (err_info->flags & CPER_ARM_INFO_FLAGS_FIRST)

				printk("%sfirst error captured\n", newpfx);

			if (err_info->flags & CPER_ARM_INFO_FLAGS_LAST)

				printk("%slast error captured\n", newpfx);

			if (err_info->flags & CPER_ARM_INFO_FLAGS_PROPAGATED)

				printk("%spropagated error captured\n",

				       newpfx);

			if (err_info->flags & CPER_ARM_INFO_FLAGS_OVERFLOW)

				printk("%soverflow occurred, error info is incomplete\n",

				       newpfx);

		}



		printk("%serror_type: %d, %s\n", newpfx, err_info->type,

			err_info->type < ARRAY_SIZE(cper_proc_error_type_strs) ?

			cper_proc_error_type_strs[err_info->type] : "unknown");

		if (err_info->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO) {

			printk("%serror_info: 0x%016llx\n", newpfx,

			       err_info->error_info);

			snprintf(infopfx, sizeof(infopfx), "%s%s", newpfx, INDENT_SP);

			cper_print_arm_err_info(infopfx, err_info->type,

						err_info->error_info);

		}

		if (err_info->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR)

			printk("%svirtual fault address: 0x%016llx\n",

				newpfx, err_info->virt_fault_addr);

		if (err_info->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR)

			printk("%sphysical fault address: 0x%016llx\n",

				newpfx, err_info->physical_fault_addr);

		err_info += 1;

	}



	ctx_info = (struct cper_arm_ctx_info *)err_info;

	max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1;

	for (i = 0; i < proc->context_info_num; i++) {

		int size = sizeof(*ctx_info) + ctx_info->size;



		printk("%sContext info structure %d:\n", pfx, i);

		if (len < size) {

			printk("%ssection length is too small\n", newpfx);

			printk("%sfirmware-generated error record is incorrect\n", pfx);

			return;

		}

		if (ctx_info->type > max_ctx_type) {

			printk("%sInvalid context type: %d (max: %d)\n",

				newpfx, ctx_info->type, max_ctx_type);

			return;

		}

		printk("%sregister context type: %s\n", newpfx,

			arm_reg_ctx_strs[ctx_info->type]);

		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4,

				(ctx_info + 1), ctx_info->size, 0);

		len -= size;

		ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + size);

	}



	if (len > 0) {

		printk("%sVendor specific error info has %u bytes:\n", pfx,

		       len);

		print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, ctx_info,

				len, true);

	}

}

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