drivers: edac: Add Cache Error Reporting driver

* Kryo EDAC node

Kryo EDAC node is defined to describe on-chip error detection and correction

for the Kryo core.

Kryo will report all SBE and DBE found in L1/L2/L3/SCU caches in two registers:

	ERRXSTATUS - Error Record Primary Status Register

	ERRXMISC0 - Error Record Miscellaneous Register

Current implementation of Kryo ECC mechanism is based on interrupts.

The following section describes the DT node binding for kryo_cpu_erp.

Required properties:

- compatible		: Shall be "arm,arm64-kryo-cpu-erp".

- interrupts		: Interrupt-specifier for L1/L2, L3/SCU error IRQ(s)

- interrupt-names	: Descriptive names of the interrupts

Example:

	kryo-erp {

		compatible = "arm,arm64-kryo-cpu-erp";

		interrupts = <1 6 4>,

			<1 7 4>,

			<0 34 4>,

			<0 35 4>;

		interrupt-names = "l1-l2-faultirq",

				"l1-l2-errirq",

				"l3-scu-errirq",

				"l3-scu-faultirq";

	};

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.

 */

#ifndef ASM_KRYO_EDAC_H

#define ASM_KRYO_EDAC_H

#if defined(CONFIG_EDAC_KRYO_ARM64)

void kryo_poll_cache_errors(void *info);

#else

static inline void kryo_poll_cache_errors(void *info) { }

#endif

#endif

#include <asm/system_misc.h>

#include <asm/pgtable.h>

#include <asm/tlbflush.h>

#include <asm/kryo-arm64-edac.h>

#include <asm/traps.h>

#include <acpi/ghes.h>

static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs)

{

	kryo_poll_cache_errors(NULL);

	return 1; /* "fault" */

}

	  Support for error detection and correction on the Synopsys DDR

	  memory controller.

config EDAC_KRYO_ARM64

	depends on ARM64

	tristate "ARM KRYO Gold and Silver L1/L2/L3/SCU Caches"

	help

	  Support for error detection and correction on the

	  Kryo3xx Gold and Silver CPUs. Reports errors caught by Kryo3xx

	  ECC mechanism.

	  For debugging issues having to do with stability and overall system

	  health, you should probably say 'Y' here.

config EDAC_KRYO_ARM64_POLL

	depends on EDAC_KRYO_ARM64

	bool "Poll on kryo ECC registers - kryo"

	help

	  This option chooses whether or not you want to poll on the Kryo3xx

	  ECC registers. When this is enabled, the polling rate can be set as

	  a module parameter. By default, it will call the polling function

	  every second.

	  This option should only be used if the associated interrupt lines

	  are not enabled.

config EDAC_KRYO_ARM64_PANIC_ON_CE

	depends on EDAC_KRYO_ARM64

	bool "Panic on correctable errors - kryo"

	help

	  Forcibly cause a kernel panic if an correctable error (CE) is

	  detected, even though the error is (by definition) correctable and

	  would otherwise result in no adverse system effects. This can reduce

	  debugging times on hardware which may be operating at voltages or

	  frequencies outside normal specification.

	  For production builds, you should definitely say 'N' here.

config EDAC_KRYO_ARM64_PANIC_ON_UE

	depends on EDAC_KRYO_ARM64

	bool "Panic on uncorrectable errors - kryo"

	help

	  Forcibly cause a kernel panic if an uncorrectable error (UE) is

	  detected. This can reduce debugging times on hardware which may be

	  operating at voltages or frequencies outside normal specification.

	  For production builds, you should probably say 'N' here.

config EDAC_XGENE

	tristate "APM X-Gene SoC"

	depends on (ARM64 || COMPILE_TEST)

obj-$(CONFIG_EDAC_X38)			+= x38_edac.o

obj-$(CONFIG_EDAC_I82860)		+= i82860_edac.o

obj-$(CONFIG_EDAC_R82600)		+= r82600_edac.o

obj-$(CONFIG_EDAC_KRYO_ARM64)          += kryo_arm64_edac.o

amd64_edac_mod-y := amd64_edac.o

amd64_edac_mod-$(CONFIG_EDAC_DEBUG) += amd64_edac_dbg.o