--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cortex A72 EDAC L1 and L2 cache error detection
+ *
+ * Copyright (c) 2020 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
+ * Copyright (c) 2025 Microsoft Corporation, <vijayb@linux.microsoft.com>
+ *
+ * Based on Code from:
+ * Copyright (c) 2018, NXP Semiconductor
+ * Author: York Sun <york.sun@nxp.com>
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/bitfield.h>
+#include <asm/smp_plat.h>
+
+#include "edac_module.h"
+
+#define DRVNAME "a72-edac"
+
+#define SYS_CPUMERRSR_EL1 sys_reg(3, 1, 15, 2, 2)
+#define SYS_L2MERRSR_EL1 sys_reg(3, 1, 15, 2, 3)
+
+#define CPUMERRSR_EL1_RAMID GENMASK(30, 24)
+#define L2MERRSR_EL1_CPUID_WAY GENMASK(21, 18)
+
+#define CPUMERRSR_EL1_VALID BIT(31)
+#define CPUMERRSR_EL1_FATAL BIT(63)
+#define L2MERRSR_EL1_VALID BIT(31)
+#define L2MERRSR_EL1_FATAL BIT(63)
+
+#define L1_I_TAG_RAM 0x00
+#define L1_I_DATA_RAM 0x01
+#define L1_D_TAG_RAM 0x08
+#define L1_D_DATA_RAM 0x09
+#define TLB_RAM 0x18
+
+#define MESSAGE_SIZE 64
+
+struct mem_err_synd_reg {
+ u64 cpu_mesr;
+ u64 l2_mesr;
+};
+
+static struct cpumask compat_mask;
+
+static void report_errors(struct edac_device_ctl_info *edac_ctl, int cpu,
+ struct mem_err_synd_reg *mesr)
+{
+ u64 cpu_mesr = mesr->cpu_mesr;
+ u64 l2_mesr = mesr->l2_mesr;
+ char msg[MESSAGE_SIZE];
+
+ if (cpu_mesr & CPUMERRSR_EL1_VALID) {
+ const char *str;
+ bool fatal = cpu_mesr & CPUMERRSR_EL1_FATAL;
+
+ switch (FIELD_GET(CPUMERRSR_EL1_RAMID, cpu_mesr)) {
+ case L1_I_TAG_RAM:
+ str = "L1-I Tag RAM";
+ break;
+ case L1_I_DATA_RAM:
+ str = "L1-I Data RAM";
+ break;
+ case L1_D_TAG_RAM:
+ str = "L1-D Tag RAM";
+ break;
+ case L1_D_DATA_RAM:
+ str = "L1-D Data RAM";
+ break;
+ case TLB_RAM:
+ str = "TLB RAM";
+ break;
+ default:
+ str = "Unspecified";
+ break;
+ }
+
+ snprintf(msg, MESSAGE_SIZE, "%s %s error(s) on CPU %d",
+ str, fatal ? "fatal" : "correctable", cpu);
+
+ if (fatal)
+ edac_device_handle_ue(edac_ctl, cpu, 0, msg);
+ else
+ edac_device_handle_ce(edac_ctl, cpu, 0, msg);
+ }
+
+ if (l2_mesr & L2MERRSR_EL1_VALID) {
+ bool fatal = l2_mesr & L2MERRSR_EL1_FATAL;
+
+ snprintf(msg, MESSAGE_SIZE, "L2 %s error(s) on CPU %d CPUID/WAY 0x%lx",
+ fatal ? "fatal" : "correctable", cpu,
+ FIELD_GET(L2MERRSR_EL1_CPUID_WAY, l2_mesr));
+ if (fatal)
+ edac_device_handle_ue(edac_ctl, cpu, 1, msg);
+ else
+ edac_device_handle_ce(edac_ctl, cpu, 1, msg);
+ }
+}
+
+static void read_errors(void *data)
+{
+ struct mem_err_synd_reg *mesr = data;
+
+ mesr->cpu_mesr = read_sysreg_s(SYS_CPUMERRSR_EL1);
+ if (mesr->cpu_mesr & CPUMERRSR_EL1_VALID) {
+ write_sysreg_s(0, SYS_CPUMERRSR_EL1);
+ isb();
+ }
+ mesr->l2_mesr = read_sysreg_s(SYS_L2MERRSR_EL1);
+ if (mesr->l2_mesr & L2MERRSR_EL1_VALID) {
+ write_sysreg_s(0, SYS_L2MERRSR_EL1);
+ isb();
+ }
+}
+
+static void a72_edac_check(struct edac_device_ctl_info *edac_ctl)
+{
+ struct mem_err_synd_reg mesr;
+ int cpu;
+
+ cpus_read_lock();
+ for_each_cpu_and(cpu, cpu_online_mask, &compat_mask) {
+ smp_call_function_single(cpu, read_errors, &mesr, true);
+ report_errors(edac_ctl, cpu, &mesr);
+ }
+ cpus_read_unlock();
+}
+
+static int a72_edac_probe(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *edac_ctl;
+ struct device *dev = &pdev->dev;
+ int rc;
+
+ edac_ctl = edac_device_alloc_ctl_info(0, "cpu",
+ num_possible_cpus(), "L", 2, 1,
+ edac_device_alloc_index());
+ if (!edac_ctl)
+ return -ENOMEM;
+
+ edac_ctl->edac_check = a72_edac_check;
+ edac_ctl->dev = dev;
+ edac_ctl->mod_name = dev_name(dev);
+ edac_ctl->dev_name = dev_name(dev);
+ edac_ctl->ctl_name = DRVNAME;
+ dev_set_drvdata(dev, edac_ctl);
+
+ rc = edac_device_add_device(edac_ctl);
+ if (rc)
+ goto out_dev;
+
+ return 0;
+
+out_dev:
+ edac_device_free_ctl_info(edac_ctl);
+
+ return rc;
+}
+
+static void a72_edac_remove(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *edac_ctl = dev_get_drvdata(&pdev->dev);
+
+ edac_device_del_device(edac_ctl->dev);
+ edac_device_free_ctl_info(edac_ctl);
+}
+
+static const struct of_device_id cortex_arm64_edac_of_match[] = {
+ { .compatible = "arm,cortex-a72" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, cortex_arm64_edac_of_match);
+
+static struct platform_driver a72_edac_driver = {
+ .probe = a72_edac_probe,
+ .remove = a72_edac_remove,
+ .driver = {
+ .name = DRVNAME,
+ },
+};
+
+static struct platform_device *a72_pdev;
+
+static int __init a72_edac_driver_init(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct device_node *np __free(device_node) = of_cpu_device_node_get(cpu);
+ if (np) {
+ if (of_match_node(cortex_arm64_edac_of_match, np) &&
+ of_property_read_bool(np, "edac-enabled")) {
+ cpumask_set_cpu(cpu, &compat_mask);
+ }
+ } else {
+ pr_warn("failed to find device node for CPU %d\n", cpu);
+ }
+ }
+
+ if (cpumask_empty(&compat_mask))
+ return 0;
+
+ a72_pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
+ if (IS_ERR(a72_pdev)) {
+ pr_err("failed to register A72 EDAC device\n");
+ return PTR_ERR(a72_pdev);
+ }
+
+ return platform_driver_register(&a72_edac_driver);
+}
+
+static void __exit a72_edac_driver_exit(void)
+{
+ platform_device_unregister(a72_pdev);
+ platform_driver_unregister(&a72_edac_driver);
+}
+
+module_init(a72_edac_driver_init);
+module_exit(a72_edac_driver_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
+MODULE_DESCRIPTION("Cortex A72 L1 and L2 cache EDAC driver");
projects / thirdparty / kernel / stable.git / commitdiff
