Re: [PATCH v2] EDAC: Add ARM64 EDAC
From: Mauro Carvalho Chehab
Date: Wed Oct 21 2015 - 17:25:59 EST
Em Wed, 21 Oct 2015 15:41:37 -0500
Brijesh Singh <brijeshkumar.singh@xxxxxxx> escreveu:
> Add support for Cortex A57 and A53 EDAC driver.
>
> Signed-off-by: Brijesh Singh <brijeshkumar.singh@xxxxxxx>
> CC: robh+dt@xxxxxxxxxx
> CC: pawel.moll@xxxxxxx
> CC: mark.rutland@xxxxxxx
> CC: ijc+devicetree@xxxxxxxxxxxxxx
> CC: galak@xxxxxxxxxxxxxx
> CC: dougthompson@xxxxxxxxxxxx
> CC: bp@xxxxxxxxx
> CC: mchehab@xxxxxxxxxxxxxxx
> CC: devicetree@xxxxxxxxxxxxxxx
> CC: guohanjun@xxxxxxxxxx
> CC: andre.przywara@xxxxxxx
> CC: arnd@xxxxxxxx
> CC: linux-kernel@xxxxxxxxxxxxxxx
> CC: linux-edac@xxxxxxxxxxxxxxx
> ---
>
> v2:
> * convert into generic arm64 edac driver
> * remove AMD specific references from dt binding
> * remove poll_msec property from dt binding
> * add poll_msec as a module param, default is 100ms
> * update copyright text
> * define macro mnemonics for L1 and L2 RAMID
> * check L2 error per-cluster instead of per core
> * update function names
> * use get_online_cpus() and put_online_cpus() to make L1 and L2 register
> read hotplug-safe
> * add error check in probe routine
>
> .../devicetree/bindings/edac/armv8-edac.txt | 15 +
> drivers/edac/Kconfig | 6 +
> drivers/edac/Makefile | 1 +
> drivers/edac/cortex_arm64_edac.c | 457 +++++++++++++++++++++
> 4 files changed, 479 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/edac/armv8-edac.txt
> create mode 100644 drivers/edac/cortex_arm64_edac.c
>
> diff --git a/Documentation/devicetree/bindings/edac/armv8-edac.txt b/Documentation/devicetree/bindings/edac/armv8-edac.txt
> new file mode 100644
> index 0000000..dfd128f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/edac/armv8-edac.txt
> @@ -0,0 +1,15 @@
> +* ARMv8 L1/L2 cache error reporting
> +
> +On ARMv8, CPU Memory Error Syndrome Register and L2 Memory Error Syndrome
> +Register can be used for checking L1 and L2 memory errors.
> +
> +The following section describes the ARMv8 EDAC DT node binding.
> +
> +Required properties:
> +- compatible: Should be "arm,armv8-edac"
> +
> +Example:
> + edac {
> + compatible = "arm,armv8-edac";
> + };
> +
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index ef25000..dd7c195 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -390,4 +390,10 @@ config EDAC_XGENE
> Support for error detection and correction on the
> APM X-Gene family of SOCs.
>
> +config EDAC_CORTEX_ARM64
> + tristate "ARM Cortex A57/A53"
> + depends on EDAC_MM_EDAC && ARM64
It would be good to be able to compile it on non-ARM64 archs
if COMPILE_TEST, e. g.:
depends on EDAC_MM_EDAC && (ARM64 || COMPILE_TEST)
That would allow testing tools like Coverity to test it. As far as
I know, the public license we use only works on x86.
> + help
> + Support for error detection and correction on the
> + ARM Cortex A57 and A53.
> endif # EDAC
> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
> index ae3c5f3..ac01660 100644
> --- a/drivers/edac/Makefile
> +++ b/drivers/edac/Makefile
> @@ -68,3 +68,4 @@ obj-$(CONFIG_EDAC_OCTEON_PCI) += octeon_edac-pci.o
> obj-$(CONFIG_EDAC_ALTERA_MC) += altera_edac.o
> obj-$(CONFIG_EDAC_SYNOPSYS) += synopsys_edac.o
> obj-$(CONFIG_EDAC_XGENE) += xgene_edac.o
> +obj-$(CONFIG_EDAC_CORTEX_ARM64) += cortex_arm64_edac.o
> diff --git a/drivers/edac/cortex_arm64_edac.c b/drivers/edac/cortex_arm64_edac.c
> new file mode 100644
> index 0000000..c37bb94
> --- /dev/null
> +++ b/drivers/edac/cortex_arm64_edac.c
> @@ -0,0 +1,457 @@
> +/*
> + * Cortex ARM64 EDAC
> + *
> + * Copyright (c) 2015, Advanced Micro Devices
> + * Author: Brijesh Singh <brijeshkumar.singh@xxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License.
> + *
> + * 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.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +
> +#include "edac_core.h"
> +
> +#define EDAC_MOD_STR "cortex_arm64_edac"
> +
> +#define A57_CPUMERRSR_EL1_INDEX(x) ((x) & 0x1ffff)
> +#define A57_CPUMERRSR_EL1_BANK(x) (((x) >> 18) & 0x1f)
> +#define A57_CPUMERRSR_EL1_RAMID(x) (((x) >> 24) & 0x7f)
> +#define A57_CPUMERRSR_EL1_VALID(x) ((x) & (1 << 31))
> +#define A57_CPUMERRSR_EL1_REPEAT(x) (((x) >> 32) & 0x7f)
> +#define A57_CPUMERRSR_EL1_OTHER(x) (((x) >> 40) & 0xff)
> +#define A57_CPUMERRSR_EL1_FATAL(x) ((x) & (1UL << 63))
> +#define A57_L1_I_TAG_RAM 0x00
> +#define A57_L1_I_DATA_RAM 0x01
> +#define A57_L1_D_TAG_RAM 0x08
> +#define A57_L1_D_DATA_RAM 0x09
> +#define A57_L1_TLB_RAM 0x18
> +
> +#define A57_L2MERRSR_EL1_INDEX(x) ((x) & 0x1ffff)
> +#define A57_L2MERRSR_EL1_CPUID(x) (((x) >> 18) & 0xf)
> +#define A57_L2MERRSR_EL1_RAMID(x) (((x) >> 24) & 0x7f)
> +#define A57_L2MERRSR_EL1_VALID(x) ((x) & (1 << 31))
> +#define A57_L2MERRSR_EL1_REPEAT(x) (((x) >> 32) & 0xff)
> +#define A57_L2MERRSR_EL1_OTHER(x) (((x) >> 40) & 0xff)
> +#define A57_L2MERRSR_EL1_FATAL(x) ((x) & (1UL << 63))
> +#define A57_L2_TAG_RAM 0x10
> +#define A57_L2_DATA_RAM 0x11
> +#define A57_L2_SNOOP_TAG_RAM 0x12
> +#define A57_L2_DIRTY_RAM 0x14
> +#define A57_L2_INCLUSION_PF_RAM 0x18
> +
> +#define A53_CPUMERRSR_EL1_ADDR(x) ((x) & 0xfff)
> +#define A53_CPUMERRSR_EL1_CPUID(x) (((x) >> 18) & 0x07)
> +#define A53_CPUMERRSR_EL1_RAMID(x) (((x) >> 24) & 0x7f)
> +#define A53_CPUMERRSR_EL1_VALID(x) ((x) & (1 << 31))
> +#define A53_CPUMERRSR_EL1_REPEAT(x) (((x) >> 32) & 0xff)
> +#define A53_CPUMERRSR_EL1_OTHER(x) (((x) >> 40) & 0xff)
> +#define A53_CPUMERRSR_EL1_FATAL(x) ((x) & (1UL << 63))
> +#define A53_L1_I_TAG_RAM 0x00
> +#define A53_L1_I_DATA_RAM 0x01
> +#define A53_L1_D_TAG_RAM 0x08
> +#define A53_L1_D_DATA_RAM 0x09
> +#define A53_L1_D_DIRT_RAM 0x0A
> +#define A53_L1_TLB_RAM 0x18
> +
> +#define A53_L2MERRSR_EL1_INDEX(x) (((x) >> 3) & 0x3fff)
> +#define A53_L2MERRSR_EL1_CPUID(x) (((x) >> 18) & 0x0f)
> +#define A53_L2MERRSR_EL1_RAMID(x) (((x) >> 24) & 0x7f)
> +#define A53_L2MERRSR_EL1_VALID(x) ((x) & (1 << 31))
> +#define A53_L2MERRSR_EL1_REPEAT(x) (((x) >> 32) & 0xff)
> +#define A53_L2MERRSR_EL1_OTHER(x) (((x) >> 40) & 0xff)
> +#define A53_L2MERRSR_EL1_FATAL(x) ((x) & (1UL << 63))
> +#define A53_L2_TAG_RAM 0x10
> +#define A53_L2_DATA_RAM 0x11
> +#define A53_L2_SNOOP_RAM 0x12
> +
> +#define L1_CACHE 0
> +#define L2_CACHE 1
> +
> +int poll_msec = 100;
> +
> +struct cortex_arm64_edac {
> + struct edac_device_ctl_info *edac_ctl;
> +};
> +
> +static inline u64 read_cpumerrsr_el1(void)
> +{
> + u64 val;
> +
> + asm volatile("mrs %0, s3_1_c15_c2_2" : "=r" (val));
> + return val;
> +}
> +
> +static inline void write_cpumerrsr_el1(u64 val)
> +{
> + asm volatile("msr s3_1_c15_c2_2, %0" :: "r" (val));
> +}
> +
> +static inline u64 read_l2merrsr_el1(void)
> +{
> + u64 val;
> +
> + asm volatile("mrs %0, s3_1_c15_c2_3" : "=r" (val));
> + return val;
> +}
> +
> +static inline void write_l2merrsr_el1(u64 val)
> +{
> + asm volatile("msr s3_1_c15_c2_3, %0" :: "r" (val));
> +}
> +
If we're willing to compile with COMPILE_TEST, we'll need to provide
some stubs for the above functions that won't use asm.
> +static void a53_parse_l2merrsr(struct edac_device_ctl_info *edac_ctl)
> +{
> + int fatal;
> + int repeat_err, other_err;
> + u64 val = read_l2merrsr_el1();
> +
> + if (!A53_L2MERRSR_EL1_VALID(val))
> + return;
> +
> + fatal = A53_L2MERRSR_EL1_FATAL(val);
> + repeat_err = A53_L2MERRSR_EL1_REPEAT(val);
> + other_err = A53_L2MERRSR_EL1_OTHER(val);
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR,
> + "A53 CPU%d L2 %s error detected!\n", smp_processor_id(),
> + fatal ? "fatal" : "non-fatal");
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2MERRSR_EL1=%#llx\n", val);
> +
> + switch (A53_L2MERRSR_EL1_RAMID(val)) {
> + case A53_L2_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Tag RAM\n");
> + break;
> + case A53_L2_DATA_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Data RAM\n");
> + break;
> + case A53_L2_SNOOP_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Snoop filter RAM\n");
> + break;
> + default:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "unknown RAMID\n");
> + break;
> + }
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Repeated error count=%d",
> + repeat_err);
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Other error count=%d\n",
> + other_err);
> + if (fatal)
> + edac_device_handle_ue(edac_ctl, smp_processor_id(), L2_CACHE,
> + edac_ctl->name);
> + else
> + edac_device_handle_ce(edac_ctl, smp_processor_id(), L2_CACHE,
> + edac_ctl->name);
> + write_l2merrsr_el1(0);
> +}
> +
> +static void a57_parse_l2merrsr(struct edac_device_ctl_info *edac_ctl)
> +{
> + int fatal;
> + int repeat_err, other_err;
> + u64 val = read_l2merrsr_el1();
> +
> + if (!A57_L2MERRSR_EL1_VALID(val))
> + return;
> +
> + fatal = A57_L2MERRSR_EL1_FATAL(val);
> + repeat_err = A57_L2MERRSR_EL1_REPEAT(val);
> + other_err = A57_L2MERRSR_EL1_OTHER(val);
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR,
> + "A57 CPU%d L2 %s error detected!\n", smp_processor_id(),
> + fatal ? "fatal" : "non-fatal");
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2MERRSR_EL1=%#llx\n", val);
> +
> + switch (A57_L2MERRSR_EL1_RAMID(val)) {
> + case A57_L2_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Tag RAM\n");
> + break;
> + case A57_L2_DATA_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Data RAM\n");
> + break;
> + case A57_L2_SNOOP_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Snoop tag RAM\n");
> + break;
> + case A57_L2_DIRTY_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 Dirty RAM\n");
> + break;
> + case A57_L2_INCLUSION_PF_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 inclusion PF RAM\n");
> + break;
> + default:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "unknown RAMID\n");
> + break;
> + }
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Repeated error count=%d",
> + repeat_err);
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Other error count=%d\n",
> + other_err);
> + if (fatal)
> + edac_device_handle_ue(edac_ctl, smp_processor_id(), L2_CACHE,
> + edac_ctl->name);
> + else
> + edac_device_handle_ce(edac_ctl, smp_processor_id(), L2_CACHE,
> + edac_ctl->name);
> + write_l2merrsr_el1(0);
> +}
> +
> +static void a57_parse_cpumerrsr(struct edac_device_ctl_info *edac_ctl)
> +{
> + int fatal;
> + int repeat_err, other_err;
> + u64 val = read_cpumerrsr_el1();
> +
> + if (!A57_CPUMERRSR_EL1_VALID(val))
> + return;
> +
> + fatal = A57_CPUMERRSR_EL1_FATAL(val);
> + repeat_err = A57_CPUMERRSR_EL1_REPEAT(val);
> + other_err = A57_CPUMERRSR_EL1_OTHER(val);
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR,
> + "CPU%d L1 %s error detected!\n", smp_processor_id(),
> + fatal ? "fatal" : "non-fatal");
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "CPUMERRSR_EL1=%#llx\n", val);
> +
> + switch (A57_CPUMERRSR_EL1_RAMID(val)) {
> + case A57_L1_I_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-I Tag RAM\n");
> + break;
> + case A57_L1_I_DATA_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-I Data RAM\n");
> + break;
> + case A57_L1_D_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-D Tag RAM\n");
> + break;
> + case A57_L1_D_DATA_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-D Data RAM\n");
> + break;
> + case A57_L1_TLB_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 TLB RAM\n");
> + break;
> + default:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "unknown RAMID\n");
> + break;
> + }
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Repeated error count=%d",
> + repeat_err);
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Other error count=%d\n",
> + other_err);
> +
> + if (fatal)
> + edac_device_handle_ue(edac_ctl, smp_processor_id(), L1_CACHE,
> + edac_ctl->name);
> + else
> + edac_device_handle_ce(edac_ctl, smp_processor_id(), L1_CACHE,
> + edac_ctl->name);
> + write_cpumerrsr_el1(0);
> +}
> +
> +static void a53_parse_cpumerrsr(struct edac_device_ctl_info *edac_ctl)
> +{
> + int fatal;
> + int repeat_err, other_err;
> + u64 val = read_cpumerrsr_el1();
> +
> + if (!A53_CPUMERRSR_EL1_VALID(val))
> + return;
> +
> + fatal = A53_CPUMERRSR_EL1_FATAL(val);
> + repeat_err = A53_CPUMERRSR_EL1_REPEAT(val);
> + other_err = A53_CPUMERRSR_EL1_OTHER(val);
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR,
> + "A53 CPU%d L1 %s error detected!\n", smp_processor_id(),
> + fatal ? "fatal" : "non-fatal");
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "CPUMERRSR_EL1=%#llx\n", val);
> +
> + switch (A53_CPUMERRSR_EL1_RAMID(val)) {
> + case A53_L1_I_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-I Tag RAM\n");
> + break;
> + case A53_L1_I_DATA_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-I Data RAM\n");
> + break;
> + case A53_L1_D_TAG_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-D Tag RAM\n");
> + break;
> + case A53_L1_D_DATA_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L1-D Data RAM\n");
> + break;
> + case A53_L1_TLB_RAM:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "L2 TLB RAM\n");
> + break;
> + default:
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "unknown RAMID\n");
> + break;
> + }
> +
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Repeated error count=%d",
> + repeat_err);
> + edac_printk(KERN_CRIT, EDAC_MOD_STR, "Other error count=%d\n",
> + other_err);
> +
> + if (fatal)
> + edac_device_handle_ue(edac_ctl, smp_processor_id(), L1_CACHE,
> + edac_ctl->name);
> + else
> + edac_device_handle_ce(edac_ctl, smp_processor_id(), L1_CACHE,
> + edac_ctl->name);
The above code doesn't look right to me. It should be, instead, calling
one of the functions that output the errors also via trace or to call one
of the trace functions directly (see the trace functions currently defined
at include/ras/ras_event.h).
Failing to do that would cause RAS tools (like rasdaemon) to not get
the errors.
> + write_cpumerrsr_el1(0);
> +}
> +
> +static void parse_cpumerrsr(void *args)
> +{
> + struct edac_device_ctl_info *edac_ctl = args;
> + int partnum = read_cpuid_part_number();
> +
> + switch (partnum) {
> + case ARM_CPU_PART_CORTEX_A57:
> + a57_parse_cpumerrsr(edac_ctl);
> + break;
> + case ARM_CPU_PART_CORTEX_A53:
> + a53_parse_cpumerrsr(edac_ctl);
> + break;
> + }
> +}
> +
> +static void parse_l2merrsr(void *args)
> +{
> + struct edac_device_ctl_info *edac_ctl = args;
> + int partnum = read_cpuid_part_number();
> +
> + switch (partnum) {
> + case ARM_CPU_PART_CORTEX_A57:
> + a57_parse_l2merrsr(edac_ctl);
> + break;
> + case ARM_CPU_PART_CORTEX_A53:
> + a53_parse_l2merrsr(edac_ctl);
> + break;
> + }
> +}
> +
> +static void arm64_monitor_cache_errors(struct edac_device_ctl_info *edev_ctl)
> +{
> + int cpu;
> + struct cpumask cluster_mask, old_mask;
> +
> + cpumask_clear(&cluster_mask);
> + cpumask_clear(&old_mask);
> +
> + get_online_cpus();
> + for_each_online_cpu(cpu) {
> + smp_call_function_single(cpu, parse_cpumerrsr, edev_ctl, 0);
> + cpumask_copy(&cluster_mask, topology_core_cpumask(cpu));
> + if (cpumask_equal(&cluster_mask, &old_mask))
> + continue;
> + cpumask_copy(&old_mask, &cluster_mask);
> + smp_call_function_any(&cluster_mask, parse_l2merrsr,
> + edev_ctl, 0);
> + }
> + put_online_cpus();
> +}
> +
> +static int cortex_arm64_edac_probe(struct platform_device *pdev)
> +{
> + int rc;
> + struct cortex_arm64_edac *drv;
> + struct device *dev = &pdev->dev;
> +
> + drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
> + if (!drv)
> + return -ENOMEM;
> +
> + drv->edac_ctl = edac_device_alloc_ctl_info(0, "cpu",
> + num_possible_cpus(), "L", 2,
> + 1, NULL, 0,
> + edac_device_alloc_index());
> + if (IS_ERR(drv->edac_ctl))
> + return -ENOMEM;
> +
> + drv->edac_ctl->poll_msec = poll_msec;
> + drv->edac_ctl->edac_check = arm64_monitor_cache_errors;
> + drv->edac_ctl->dev = dev;
> + drv->edac_ctl->mod_name = dev_name(dev);
> + drv->edac_ctl->dev_name = dev_name(dev);
> + drv->edac_ctl->ctl_name = "cpu_err";
> + drv->edac_ctl->panic_on_ue = 1;
> + platform_set_drvdata(pdev, drv);
> +
> + rc = edac_device_add_device(drv->edac_ctl);
> + if (rc)
> + goto edac_alloc_failed;
> +
> + return 0;
> +
> +edac_alloc_failed:
> + edac_device_free_ctl_info(drv->edac_ctl);
> + return rc;
> +}
> +
> +static int cortex_arm64_edac_remove(struct platform_device *pdev)
> +{
> + struct cortex_arm64_edac *drv = dev_get_drvdata(&pdev->dev);
> + struct edac_device_ctl_info *edac_ctl = drv->edac_ctl;
> +
> + edac_device_del_device(edac_ctl->dev);
> + edac_device_free_ctl_info(edac_ctl);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id cortex_arm64_edac_of_match[] = {
> + { .compatible = "arm,armv8-edac" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, cortex_arm64_edac_of_match);
> +
> +static struct platform_driver cortex_arm64_edac_driver = {
> + .probe = cortex_arm64_edac_probe,
> + .remove = cortex_arm64_edac_remove,
> + .driver = {
> + .name = "arm64-edac",
> + .owner = THIS_MODULE,
> + .of_match_table = cortex_arm64_edac_of_match,
> + },
> +};
> +
> +static int __init cortex_arm64_edac_init(void)
> +{
> + int rc;
> +
> + /* Only POLL mode is supported so far */
> + edac_op_state = EDAC_OPSTATE_POLL;
> +
> + rc = platform_driver_register(&cortex_arm64_edac_driver);
> + if (rc) {
> + edac_printk(KERN_ERR, EDAC_MOD_STR, "failed to register\n");
> + return rc;
> + }
> +
> + return 0;
> +}
> +module_init(cortex_arm64_edac_init);
> +
> +static void __exit cortex_arm64_edac_exit(void)
> +{
> + platform_driver_unregister(&cortex_arm64_edac_driver);
> +}
> +module_exit(cortex_arm64_edac_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Brijesh Singh <brijeshkumar.singh@xxxxxxx>");
> +MODULE_DESCRIPTION("Cortex A57 and A53 EDAC driver");
> +module_param(poll_msec, int, 0444);
> +MODULE_PARM_DESC(poll_msec, "EDAC monitor poll interval in msec");
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