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Subject[PATCH 3/3] edac: sifive: Add EDAC platform driver for SiFive SoCs
Date
This initial ver of EDAC driver supports:
- ECC event monitoring and reporting through the EDAC framework for SiFive
L2 cache controller.

This driver registers for notifier events from the L2 cache controller
driver (arch/riscv/mm/sifive_l2_cache.c) for L2 ECC events

Signed-off-by: Yash Shah <yash.shah@sifive.com>
---
arch/riscv/Kconfig | 1 +
drivers/edac/Kconfig | 6 +++
drivers/edac/Makefile | 1 +
drivers/edac/sifive_edac.c | 121 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 129 insertions(+)
create mode 100644 drivers/edac/sifive_edac.c

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index eb56c82..31999a6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -49,6 +49,7 @@ config RISCV
select GENERIC_IRQ_MULTI_HANDLER
select ARCH_HAS_PTE_SPECIAL
select HAVE_EBPF_JIT if 64BIT
+ select EDAC_SUPPORT

config MMU
def_bool y
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 47eb4d1..3e05228 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -460,6 +460,12 @@ config EDAC_ALTERA_SDMMC
Support for error detection and correction on the
Altera SDMMC FIFO Memory for Altera SoCs.

+config EDAC_SIFIVE
+ bool "Sifive platform EDAC driver"
+ depends on EDAC=y && RISCV
+ help
+ Support for error detection and correction on the SiFive SoCs.
+
config EDAC_SYNOPSYS
tristate "Synopsys DDR Memory Controller"
depends on ARCH_ZYNQ || ARCH_ZYNQMP
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 89ad4a84..165ca65e 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -79,6 +79,7 @@ obj-$(CONFIG_EDAC_OCTEON_PCI) += octeon_edac-pci.o
obj-$(CONFIG_EDAC_THUNDERX) += thunderx_edac.o

obj-$(CONFIG_EDAC_ALTERA) += altera_edac.o
+obj-$(CONFIG_EDAC_SIFIVE) += sifive_edac.o
obj-$(CONFIG_EDAC_SYNOPSYS) += synopsys_edac.o
obj-$(CONFIG_EDAC_XGENE) += xgene_edac.o
obj-$(CONFIG_EDAC_TI) += ti_edac.o
diff --git a/drivers/edac/sifive_edac.c b/drivers/edac/sifive_edac.c
new file mode 100644
index 0000000..eb7a9b9
--- /dev/null
+++ b/drivers/edac/sifive_edac.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SiFive Platform EDAC Driver
+ *
+ * Copyright (C) 2018-2019 SiFive, Inc.
+ *
+ * This driver is partially based on octeon_edac-pc.c
+ *
+ */
+#include <linux/edac.h>
+#include <linux/platform_device.h>
+#include "edac_module.h"
+
+#define DRVNAME "sifive_edac"
+
+extern int register_sifive_l2_error_notifier(struct notifier_block *nb);
+extern int unregister_sifive_l2_error_notifier(struct notifier_block *nb);
+
+struct sifive_edac_priv {
+ struct notifier_block notifier;
+ struct edac_device_ctl_info *dci;
+};
+
+/**
+ * EDAC error callback
+ *
+ * @event: non-zero if unrecoverable.
+ */
+static
+int ecc_err_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ const char *msg = (char *)ptr;
+ struct sifive_edac_priv *p;
+
+ p = container_of(this, struct sifive_edac_priv, notifier);
+
+ if (event)
+ edac_device_handle_ue(p->dci, 0, 0, msg);
+ else
+ edac_device_handle_ce(p->dci, 0, 0, msg);
+
+ return NOTIFY_STOP;
+}
+
+static int ecc_register(struct platform_device *pdev)
+{
+ struct sifive_edac_priv *p;
+
+ p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ p->notifier.notifier_call = ecc_err_event;
+ platform_set_drvdata(pdev, p);
+
+ p->dci = edac_device_alloc_ctl_info(sizeof(*p), "sifive_ecc", 1,
+ "sifive_ecc", 1, 1, NULL, 0,
+ edac_device_alloc_index());
+ if (IS_ERR(p->dci))
+ return PTR_ERR(p->dci);
+
+ p->dci->dev = &pdev->dev;
+ p->dci->mod_name = "Sifive ECC Manager";
+ p->dci->ctl_name = dev_name(&pdev->dev);
+ p->dci->dev_name = dev_name(&pdev->dev);
+
+ if (edac_device_add_device(p->dci)) {
+ dev_err(p->dci->dev, "failed to register with EDAC core\n");
+ goto err;
+ }
+
+ register_sifive_l2_error_notifier(&p->notifier);
+
+ return 0;
+
+err:
+ edac_device_free_ctl_info(p->dci);
+
+ return -ENXIO;
+}
+
+static int ecc_unregister(struct platform_device *pdev)
+{
+ struct sifive_edac_priv *p = platform_get_drvdata(pdev);
+
+ unregister_sifive_l2_error_notifier(&p->notifier);
+ edac_device_del_device(&pdev->dev);
+ edac_device_free_ctl_info(p->dci);
+
+ return 0;
+}
+
+struct platform_device *sifive_pdev;
+
+static int __init sifive_edac_init(void)
+{
+ int ret;
+
+ sifive_pdev = platform_device_register_simple(DRVNAME, 0, NULL, 0);
+ if (IS_ERR(sifive_pdev))
+ return PTR_ERR(sifive_pdev);
+
+ ret = ecc_register(sifive_pdev);
+ if (ret)
+ platform_device_unregister(sifive_pdev);
+
+ return ret;
+}
+
+static void __exit sifive_edac_exit(void)
+{
+ ecc_unregister(sifive_pdev);
+ platform_device_unregister(sifive_pdev);
+}
+
+module_init(sifive_edac_init);
+module_exit(sifive_edac_exit);
+
+MODULE_AUTHOR("SiFive Inc.");
+MODULE_DESCRIPTION("SiFive platform EDAC driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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