[PATCH 2/2] edac: add support for Amazon's Annapurna Labs EDAC

Hanna Hawa
2019-05-30T10:15:29Z

Add support for error detection and correction for Amazon's Annapurna
Labs SoCs for L1/L2 caches.

Amazon's Annapurna Labs SoCs based on ARM CA57 and CA72, the driver
support both cortex based on compatible string.

Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
---
MAINTAINERS | 7 +
drivers/edac/Kconfig | 9 ++
drivers/edac/Makefile | 1 +
drivers/edac/amazon_al_ca57_edac.c | 283 +++++++++++++++++++++++++++++++++++++
4 files changed, 300 insertions(+)
create mode 100644 drivers/edac/amazon_al_ca57_edac.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5cfbea4..87fab6a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5645,6 +5645,13 @@ S: Supported
F: Documentation/filesystems/ecryptfs.txt
F: fs/ecryptfs/

+EDAC-AMAZON-AL
+M: Hanna Hawa <hhhawa@amazon.com>
+L: linux-edac@vger.kernel.org
+S: Supported
+F: drivers/edac/amazon_al_ca57_edac.c
+F: Documentation/devicetree/bindings/edac/amazon-al-edac.txt
+
EDAC-AMD64
M: Borislav Petkov <bp@alien8.de>
L: linux-edac@vger.kernel.org
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 5e2e034..1a982f8 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -504,4 +504,13 @@ config EDAC_ASPEED
First, ECC must be configured in the bootloader. Then, this driver
will expose error counters via the EDAC kernel framework.

+config EDAC_AMAZON_AL
+ tristate "Amazon AL EDAC"
+ depends on ARCH_ALPINE
+ help
+ Support for error detection and correction for
+ Amazon's Annapurna Labs SoCs.
+
+ This driver detect errors on L1/L2 caches.
+
endif # EDAC
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 89ad4a84..7e08974 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -84,3 +84,4 @@ obj-$(CONFIG_EDAC_XGENE) += xgene_edac.o
obj-$(CONFIG_EDAC_TI) += ti_edac.o
obj-$(CONFIG_EDAC_QCOM) += qcom_edac.o
obj-$(CONFIG_EDAC_ASPEED) += aspeed_edac.o
+obj-$(CONFIG_EDAC_AMAZON_AL) += amazon_al_ca57_edac.o
diff --git a/drivers/edac/amazon_al_ca57_edac.c b/drivers/edac/amazon_al_ca57_edac.c
new file mode 100644
index 0000000..08237c0
--- /dev/null
+++ b/drivers/edac/amazon_al_ca57_edac.c
@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ */
+
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+#include "edac_device.h"
+#include "edac_module.h"
+
+#define DRV_NAME "al_cache_edac"
+
+/* Same bit assignments of CPUMERRSR_EL1 and L2MERRSR_EL1 in ARM CA57/CA72 */
+#define ARM_CA57_CPUMERRSR_INDEX_OFF (0)
+#define ARM_CA57_CPUMERRSR_INDEX_MASK (0x3FFFF)
+#define ARM_CA57_CPUMERRSR_BANK_WAY_OFF (18)
+#define ARM_CA57_CPUMERRSR_BANK_WAY_MASK (0x1F)
+#define ARM_CA57_CPUMERRSR_RAM_ID_OFF (24)
+#define ARM_CA57_CPUMERRSR_RAM_ID_MASK (0x7F)
+#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_TLB_RAM 0x18
+#define ARM_CA57_CPUMERRSR_VALID_OFF (31)
+#define ARM_CA57_CPUMERRSR_VALID_MASK (0x1)
+#define ARM_CA57_CPUMERRSR_REPEAT_OFF (32)
+#define ARM_CA57_CPUMERRSR_REPEAT_MASK (0xFF)
+#define ARM_CA57_CPUMERRSR_OTHER_OFF (40)
+#define ARM_CA57_CPUMERRSR_OTHER_MASK (0xFF)
+#define ARM_CA57_CPUMERRSR_FATAL_OFF (63)
+#define ARM_CA57_CPUMERRSR_FATAL_MASK (0x1)
+
+#define ARM_CA57_L2MERRSR_INDEX_OFF (0)
+#define ARM_CA57_L2MERRSR_INDEX_MASK (0x3FFFF)
+#define ARM_CA57_L2MERRSR_CPUID_WAY_OFF (18)
+#define ARM_CA57_L2MERRSR_CPUID_WAY_MASK (0xF)
+#define ARM_CA57_L2MERRSR_RAMID_OFF (24)
+#define ARM_CA57_L2MERRSR_RAMID_MASK (0x7F)
+#define ARM_CA57_L2_TAG_RAM 0x10
+#define ARM_CA57_L2_DATA_RAM 0x11
+#define ARM_CA57_L2_SNOOP_RAM 0x12
+#define ARM_CA57_L2_DIRTY_RAM 0x14
+#define ARM_CA57_L2_INC_PLRU_RAM 0x18
+#define ARM_CA57_L2MERRSR_VALID_OFF (31)
+#define ARM_CA57_L2MERRSR_VALID_MASK (0x1)
+#define ARM_CA57_L2MERRSR_REPEAT_OFF (32)
+#define ARM_CA57_L2MERRSR_REPEAT_MASK (0xFF)
+#define ARM_CA57_L2MERRSR_OTHER_OFF (40)
+#define ARM_CA57_L2MERRSR_OTHER_MASK (0xFF)
+#define ARM_CA57_L2MERRSR_FATAL_OFF (63)
+#define ARM_CA57_L2MERRSR_FATAL_MASK (0x1)
+
+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));
+}
+
+static void al_a57_edac_cpumerrsr(void *arg)
+{
+ struct edac_device_ctl_info *edac_dev =
+ (struct edac_device_ctl_info *)arg;
+ int cpu;
+ u32 index, way, ramid, repeat, other, fatal;
+ u64 val = read_cpumerrsr_el1();
+
+ /* Return if no valid error */
+ if (!((val >> ARM_CA57_CPUMERRSR_VALID_OFF) &
+ ARM_CA57_CPUMERRSR_VALID_MASK))
+ return;
+
+ cpu = smp_processor_id();
+ index = (val >> ARM_CA57_CPUMERRSR_INDEX_OFF) &
+ ARM_CA57_CPUMERRSR_INDEX_MASK;
+ way = (val >> ARM_CA57_CPUMERRSR_BANK_WAY_OFF) &
+ ARM_CA57_CPUMERRSR_BANK_WAY_MASK;
+ ramid = (val >> ARM_CA57_CPUMERRSR_RAM_ID_OFF) &
+ ARM_CA57_CPUMERRSR_RAM_ID_MASK;
+ repeat = (val >> ARM_CA57_CPUMERRSR_REPEAT_OFF) &
+ ARM_CA57_CPUMERRSR_REPEAT_MASK;
+ other = (val >> ARM_CA57_CPUMERRSR_OTHER_OFF) &
+ ARM_CA57_CPUMERRSR_OTHER_MASK;
+ fatal = (val >> ARM_CA57_CPUMERRSR_FATAL_OFF) &
+ ARM_CA57_CPUMERRSR_FATAL_MASK;
+
+ edac_device_handle_ce(edac_dev, 0, 0, "L2 Error");
+ edac_printk(KERN_CRIT, DRV_NAME, "CPU%d L1 %serror detected\n",
+ cpu, (fatal) ? "Fatal " : "");
+ edac_printk(KERN_CRIT, DRV_NAME, "RAMID=");
+
+ switch (ramid) {
+ case ARM_CA57_L1_I_TAG_RAM:
+ pr_cont("'L1-I Tag RAM' index=%d way=%d", index, way);
+ break;
+ case ARM_CA57_L1_I_DATA_RAM:
+ pr_cont("'L1-I Data RAM' index=%d bank= %d", index, way);
+ break;
+ case ARM_CA57_L1_D_TAG_RAM:
+ pr_cont("'L1-D Tag RAM' index=%d way=%d", index, way);
+ break;
+ case ARM_CA57_L1_D_DATA_RAM:
+ pr_cont("'L1-D Data RAM' index=%d bank=%d", index, way);
+ break;
+ case ARM_CA57_TLB_RAM:
+ pr_cont("'TLB RAM' index=%d", index);
+ break;
+ default:
+ pr_cont("'unknown'");
+ break;
+ }
+
+ pr_cont(", repeat=%d, other=%d (CPUMERRSR_EL1=0x%llx)\n", repeat, other,
+ val);
+
+ write_cpumerrsr_el1(0);
+}
+
+static void al_a57_edac_l2merrsr(void *arg)
+{
+ struct edac_device_ctl_info *edac_dev =
+ (struct edac_device_ctl_info *)arg;
+ int cpu;
+ u32 index, way, ramid, repeat, other, fatal;
+ u64 val = read_l2merrsr_el1();
+
+ /* Return if no valid error */
+ if (!((val >> ARM_CA57_L2MERRSR_VALID_OFF) &
+ ARM_CA57_L2MERRSR_VALID_MASK))
+ return;
+
+ cpu = smp_processor_id();
+ index = (val >> ARM_CA57_L2MERRSR_INDEX_OFF) &
+ ARM_CA57_L2MERRSR_INDEX_MASK;
+ way = (val >> ARM_CA57_L2MERRSR_CPUID_WAY_OFF) &
+ ARM_CA57_L2MERRSR_CPUID_WAY_MASK;
+ ramid = (val >> ARM_CA57_L2MERRSR_RAMID_OFF) &
+ ARM_CA57_L2MERRSR_RAMID_MASK;
+ repeat = (val >> ARM_CA57_L2MERRSR_REPEAT_OFF) &
+ ARM_CA57_L2MERRSR_REPEAT_MASK;
+ other = (val >> ARM_CA57_L2MERRSR_OTHER_OFF) &
+ ARM_CA57_L2MERRSR_OTHER_MASK;
+ fatal = (val >> ARM_CA57_L2MERRSR_FATAL_OFF) &
+ ARM_CA57_L2MERRSR_FATAL_MASK;
+
+ edac_device_handle_ce(edac_dev, 0, 0, "L2 Error");
+ edac_printk(KERN_CRIT, DRV_NAME, "CPU%d L2 %serror detected\n",
+ cpu, (fatal) ? "Fatal " : "");
+ edac_printk(KERN_CRIT, DRV_NAME, "RAMID=");
+
+ switch (ramid) {
+ case ARM_CA57_L2_TAG_RAM:
+ pr_cont("'L2 Tag RAM'");
+ break;
+ case ARM_CA57_L2_DATA_RAM:
+ pr_cont("'L2 Data RAM'");
+ break;
+ case ARM_CA57_L2_SNOOP_RAM:
+ pr_cont("'L2 Snoop RAM'");
+ break;
+ case ARM_CA57_L2_DIRTY_RAM:
+ pr_cont("'L2 Dirty RAM'");
+ break;
+ case ARM_CA57_L2_INC_PLRU_RAM:
+ pr_cont("'L2 Inclusion PLRU RAM'");
+ break;
+ default:
+ pr_cont("'unknown'");
+ break;
+ }
+
+ pr_cont(", cpuid/way=%d, repeat=%d, other=%d (L2MERRSR_EL1=0x%llx)\n",
+ way, repeat, other, val);
+
+ write_l2merrsr_el1(0);
+}
+
+static void al_a57_edac_check(struct edac_device_ctl_info *edac_dev)
+{
+ int cpu, cluster, last_cluster = -1;
+
+ /*
+ * Use get_online_cpus/put_online_cpus to prevent the online CPU map
+ * changing while reads the L1/L2 error status
+ */
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ /* Check L1 errors */
+ smp_call_function_single(cpu, al_a57_edac_cpumerrsr, edac_dev,
+ 0);
+ cluster = topology_physical_package_id(cpu);
+ /* Only single CPU will read the L2 error status */
+ if (cluster != last_cluster) {
+ smp_call_function_single(cpu, al_a57_edac_l2merrsr,
+ edac_dev, 0);
+ last_cluster = cluster;
+ }
+ }
+ put_online_cpus();
+}
+
+static int al_a57_edac_probe(struct platform_device *pdev)
+{
+ struct edac_device_ctl_info *edac_dev;
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ /* Polling mode is supported */
+ edac_op_state = EDAC_OPSTATE_POLL;
+
+ edac_dev = edac_device_alloc_ctl_info(0, DRV_NAME, 1, "L", 2, 1, NULL,
+ 0, edac_device_alloc_index());
+ if (IS_ERR(edac_dev))
+ return -ENOMEM;
+
+ edac_dev->edac_check = al_a57_edac_check;
+ edac_dev->dev = dev;
+ edac_dev->mod_name = dev_name(dev);
+ edac_dev->dev_name = dev_name(dev);
+ edac_dev->ctl_name = dev_name(dev);
+ platform_set_drvdata(pdev, edac_dev);
+
+ ret = edac_device_add_device(edac_dev);
+ if (ret)
+ edac_device_free_ctl_info(edac_dev);
+
+ return ret;
+}
+
+static int al_a57_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_a57_edac_of_match[] = {
+ { .compatible = "amazon,al-cortex-a57-edac" },
+ { .compatible = "amazon,al-cortex-a72-edac" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, al_a57_edac_of_match);
+
+static struct platform_driver al_a57_edac_driver = {
+ .probe = al_a57_edac_probe,
+ .remove = al_a57_edac_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = al_a57_edac_of_match,
+ },
+};
+module_platform_driver(al_a57_edac_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Hanna Hawa <hhhawa@amazon.com>");
--
2.7.4