Introduce Amazon's Annapurna Labs L1 EDAC driver to detect and report L1
errors.
Signed-off-by: Hanna Hawa <hhhawa@xxxxxxxxxx>
Reviewed-by: James Morse <james.morse@xxxxxxx>
---
MAINTAINERS | 5 +
drivers/edac/Kconfig | 8 ++
drivers/edac/Makefile | 1 +
drivers/edac/al_l1_edac.c | 213 ++++++++++++++++++++++++++++++++++++++
4 files changed, 227 insertions(+)
create mode 100644 drivers/edac/al_l1_edac.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 26f281d9f32a..a3ec6a1f7cae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -801,6 +801,11 @@ S: Maintained
F: Documentation/devicetree/bindings/interrupt-controller/amazon,al-fic.txt
F: drivers/irqchip/irq-al-fic.c
+AMAZON ANNAPURNA LABS L1 EDAC
+M: Hanna Hawa <hhhawa@xxxxxxxxxx>
+S: Maintained
+F: drivers/edac/al_l1_edac.c
+
AMAZON ANNAPURNA LABS THERMAL MMIO DRIVER
M: Talel Shenhar <talel@xxxxxxxxxx>
S: Maintained
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index fe2eb892a1bd..ba280e9c37b3 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -74,6 +74,14 @@ config EDAC_GHES
In doubt, say 'Y'.
+config EDAC_AL_L1
+ tristate "Amazon's Annapurna Labs L1 EDAC"
+ depends on ARM64 && (ARCH_ALPINE || COMPILE_TEST)
+ help
+ Support for L1 error detection and correction
+ for Amazon's Annapurna Labs SoCs.
+ This driver detects errors of L1 caches.
+
config EDAC_AMD64
tristate "AMD64 (Opteron, Athlon64)"
depends on AMD_NB && EDAC_DECODE_MCE
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 269e15118cea..5ceea270856c 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_EDAC_GHES) += ghes_edac.o
edac_mce_amd-y := mce_amd.o
obj-$(CONFIG_EDAC_DECODE_MCE) += edac_mce_amd.o
+obj-$(CONFIG_EDAC_AL_L1) += al_l1_edac.o
obj-$(CONFIG_EDAC_AMD76X) += amd76x_edac.o
obj-$(CONFIG_EDAC_CPC925) += cpc925_edac.o
obj-$(CONFIG_EDAC_I5000) += i5000_edac.o
diff --git a/drivers/edac/al_l1_edac.c b/drivers/edac/al_l1_edac.c
new file mode 100644
index 000000000000..a374758b1b1d
--- /dev/null
+++ b/drivers/edac/al_l1_edac.c
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/smp.h>
+#include <asm/sysreg.h>
+
+#include "edac_device.h"
+#include "edac_module.h"
+
+#define DRV_NAME "al_l1_edac"
+
+/* Same bit assignments of CPUMERRSR_EL1 in ARM CA57/CA72 */
+#define ARM_CA57_CPUMERRSR_EL1 sys_reg(3, 1, 15, 2, 2)
+#define ARM_CA57_CPUMERRSR_RAM_ID GENMASK(30, 24)
+#define ARM_CA57_L1_I_TAG_RAM 0x00
+#define ARM_CA57_L1_I_DATA_RAM 0x01
+#define ARM_CA57_L1_D_TAG_RAM 0x08
+#define ARM_CA57_L1_D_DATA_RAM 0x09
+#define ARM_CA57_L2_TLB_RAM 0x18
+#define ARM_CA57_CPUMERRSR_VALID BIT(31)
+#define ARM_CA57_CPUMERRSR_REPEAT GENMASK_ULL(39, 32)
+#define ARM_CA57_CPUMERRSR_OTHER GENMASK_ULL(47, 40)
+#define ARM_CA57_CPUMERRSR_FATAL BIT_ULL(63)
+
+#define AL_L1_EDAC_MSG_MAX 256
+
+struct al_l1_edac {
+ spinlock_t lock;
+};
+
+static struct platform_device *edac_l1_device;
+
+static void cpumerrsr_read_status(void *arg)
+{
+ struct edac_device_ctl_info *edac_dev = arg;
+ u32 ramid, repeat, other, fatal;
+ char msg[AL_L1_EDAC_MSG_MAX];
+ struct al_l1_edac *al_l1;
+ int cpu, space, count;
+ u64 val;
+ char *p;
+
+ al_l1 = edac_dev->pvt_info;
+
+ val = read_sysreg_s(ARM_CA57_CPUMERRSR_EL1);
+ if (!(FIELD_GET(ARM_CA57_CPUMERRSR_VALID, val)))
+ return;
+
+ write_sysreg_s(0, ARM_CA57_CPUMERRSR_EL1);
+
+ cpu = smp_processor_id();
+ ramid = FIELD_GET(ARM_CA57_CPUMERRSR_RAM_ID, val);
+ repeat = FIELD_GET(ARM_CA57_CPUMERRSR_REPEAT, val);
+ other = FIELD_GET(ARM_CA57_CPUMERRSR_OTHER, val);
+ fatal = FIELD_GET(ARM_CA57_CPUMERRSR_FATAL, val);
+
+ space = sizeof(msg);
+ p = msg;
+ count = scnprintf(p, space, "CPU%d L1 %serror detected", cpu,
+ (fatal) ? "Fatal " : "");
+ p += count;
+ space -= count;
+
+ switch (ramid) {
+ case ARM_CA57_L1_I_TAG_RAM:
+ count = scnprintf(p, space, " RAMID='L1-I Tag RAM'");
+ break;
+ case ARM_CA57_L1_I_DATA_RAM:
+ count = scnprintf(p, space, " RAMID='L1-I Data RAM'");
+ break;
+ case ARM_CA57_L1_D_TAG_RAM:
+ count = scnprintf(p, space, " RAMID='L1-D Tag RAM'");
+ break;
+ case ARM_CA57_L1_D_DATA_RAM:
+ count = scnprintf(p, space, " RAMID='L1-D Data RAM'");
+ break;
+ case ARM_CA57_L2_TLB_RAM:
+ count = scnprintf(p, space, " RAMID='L2 TLB RAM'");
+ break;
+ default:
+ count = scnprintf(p, space, " RAMID='unknown'");
+ break;
+ }
+
+ p += count;
+ space -= count;
+ count = scnprintf(p, space,
+ " repeat=%d, other=%d (CPUMERRSR_EL1=0x%llx)",
+ repeat, other, val);
+
+ spin_lock(&al_l1->lock);
+ if (fatal)
+ edac_device_handle_ue_count(edac_dev, repeat, 0, 0, msg);
+ else
+ edac_device_handle_ce_count(edac_dev, repeat, 0, 0, msg);
+ spin_unlock(&al_l1->lock);
+}
+
+static void al_l1_edac_check(struct edac_device_ctl_info *edac_dev)
+{
+ on_each_cpu(al_l1_edac_cpumerrsr_read_status, edac_dev, 1);
+}
+
+static int al_l1_edac_probe(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *edac_dev;
+ struct device *dev = &pdev->dev;
+ struct al_l1_edac *al_l1;
+ int ret;
+
+ edac_dev = edac_device_alloc_ctl_info(sizeof(*al_l1), DRV_NAME, 1, "L",
+ 1, 1, NULL, 0,
+ edac_device_alloc_index());
+ if (!edac_dev)
+ return -ENOMEM;
+
+ al_l1 = edac_dev->pvt_info;
+ edac_dev->edac_check = al_l1_edac_check;
+ edac_dev->dev = dev;
+ edac_dev->mod_name = DRV_NAME;
+ edac_dev->dev_name = dev_name(dev);
+ edac_dev->ctl_name = "L1_cache";
+ platform_set_drvdata(pdev, edac_dev);
+
+ spin_lock_init(&al_l1->lock);
+
+ ret = edac_device_add_device(edac_dev);
+ if (ret) {
+ dev_err(dev, "Failed to add L1 edac device (%d)\n", ret);
+ edac_device_free_ctl_info(edac_dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int al_l1_edac_remove(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *edac_dev = platform_get_drvdata(pdev);
+
+ edac_device_del_device(edac_dev->dev);
+ edac_device_free_ctl_info(edac_dev);
+
+ return 0;
+}
+
+static const struct of_device_id al_l1_edac_of_match[] = {
+ /*
+ * "al,alpine-v2", and "amazon,al-alpine-v3" are machine compatible
+ * strings which have Cortex-A57/A72 configured with this support,
+ * and access to CPUMERRSR_EL1 register is enabled in firmware.
+ */
+ { .compatible = "al,alpine-v2" },
+ { .compatible = "amazon,al-alpine-v3" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, al_l1_edac_of_match);
+
+static struct platform_driver al_l1_edac_driver = {
+ .probe = al_l1_edac_probe,
+ .remove = al_l1_edac_remove,
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+static int __init al_l1_init(void)
+{
+ struct device_node *root;
+ int ret;
+
+ root = of_find_node_by_path("/");
+ if (!root) {
+ pr_debug("Can't find root node!\n");
+ return 0;
+ }
+
+ if (!of_match_node(al_l1_edac_of_match, root))
+ return 0;
+
+ ret = platform_driver_register(&al_l1_edac_driver);
+ if (ret) {
+ pr_err("Failed to register %s (%d)\n", DRV_NAME, ret);
+ return ret;
+ }
+
+ edac_l1_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
+ if (IS_ERR(edac_l1_device)) {
+ pr_err("Failed to register EDAC AL L1 platform device\n");
+ platform_driver_unregister(&al_l1_edac_driver);
+ return PTR_ERR(edac_l1_device);
+ }
+
+ return 0;
+}
+
+static void __exit al_l1_exit(void)
+{
+ platform_device_unregister(edac_l1_device);
+ platform_driver_unregister(&al_l1_edac_driver);
+}
+
+module_init(al_l1_init);
+module_exit(al_l1_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Hanna Hawa <hhhawa@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Amazon's Annapurna Lab's L1 EDAC Driver");
--
2.17.1
