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Message-Id: <20220309020750.65399-3-ilkka@os.amperecomputing.com>
Date: Tue, 8 Mar 2022 18:07:50 -0800
From: Ilkka Koskinen <ilkka@...amperecomputing.com>
To: lorenzo.pieralisi@....com, guohanjun@...wei.com,
sudeep.holla@....com, rafael@...nel.org, linux@...linux.org.uk
Cc: lenb@...nel.org, robert.moore@...el.com, james.morse@....com,
linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, patches@...erecomputing.com,
scott@...amperecomputing.com, darren@...amperecomputing.com
Subject: [PATCH v6 2/2] ACPI: AGDI: Add driver for Arm Generic Diagnostic Dump and Reset device
ACPI for Arm Components 1.1 Platform Design Document v1.1 [0] specifices
Arm Generic Diagnostic Device Interface (AGDI). It allows an admin to
issue diagnostic dump and reset via an SDEI event or an interrupt.
This patch implements SDEI path.
[0] https://developer.arm.com/documentation/den0093/latest/
Signed-off-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
drivers/acpi/arm64/Kconfig | 10 ++++
drivers/acpi/arm64/Makefile | 1 +
drivers/acpi/arm64/agdi.c | 116 ++++++++++++++++++++++++++++++++++++
drivers/acpi/bus.c | 2 +
include/linux/acpi_agdi.h | 13 ++++
5 files changed, 142 insertions(+)
create mode 100644 drivers/acpi/arm64/agdi.c
create mode 100644 include/linux/acpi_agdi.h
diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig
index 6dba187f4f2e..d4a72835f328 100644
--- a/drivers/acpi/arm64/Kconfig
+++ b/drivers/acpi/arm64/Kconfig
@@ -8,3 +8,13 @@ config ACPI_IORT
config ACPI_GTDT
bool
+
+config ACPI_AGDI
+ bool "Arm Generic Diagnostic Dump and Reset Device Interface"
+ depends on ARM_SDE_INTERFACE
+ help
+ Arm Generic Diagnostic Dump and Reset Device Interface (AGDI) is
+ a standard that enables issuing a non-maskable diagnostic dump and
+ reset command.
+
+ If set, the kernel parses AGDI table and listens for the command.
diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile
index 66acbe77f46e..7b9e4045659d 100644
--- a/drivers/acpi/arm64/Makefile
+++ b/drivers/acpi/arm64/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ACPI_AGDI) += agdi.o
obj-$(CONFIG_ACPI_IORT) += iort.o
obj-$(CONFIG_ACPI_GTDT) += gtdt.o
obj-y += dma.o
diff --git a/drivers/acpi/arm64/agdi.c b/drivers/acpi/arm64/agdi.c
new file mode 100644
index 000000000000..4df337d545b7
--- /dev/null
+++ b/drivers/acpi/arm64/agdi.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * This file implements handling of
+ * Arm Generic Diagnostic Dump and Reset Interface table (AGDI)
+ *
+ * Copyright (c) 2022, Ampere Computing LLC
+ */
+
+#define pr_fmt(fmt) "ACPI: AGDI: " fmt
+
+#include <linux/acpi.h>
+#include <linux/arm_sdei.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+
+struct agdi_data {
+ int sdei_event;
+};
+
+static int agdi_sdei_handler(u32 sdei_event, struct pt_regs *regs, void *arg)
+{
+ nmi_panic(regs, "Arm Generic Diagnostic Dump and Reset SDEI event issued");
+ return 0;
+}
+
+static int agdi_sdei_probe(struct platform_device *pdev,
+ struct agdi_data *adata)
+{
+ int err;
+
+ err = sdei_event_register(adata->sdei_event, agdi_sdei_handler, pdev);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to register for SDEI event %d",
+ adata->sdei_event);
+ return err;
+ }
+
+ err = sdei_event_enable(adata->sdei_event);
+ if (err) {
+ sdei_event_unregister(adata->sdei_event);
+ dev_err(&pdev->dev, "Failed to enable event %d\n",
+ adata->sdei_event);
+ return err;
+ }
+
+ return 0;
+}
+
+static int agdi_probe(struct platform_device *pdev)
+{
+ struct agdi_data *adata = dev_get_platdata(&pdev->dev);
+
+ if (!adata)
+ return -EINVAL;
+
+ return agdi_sdei_probe(pdev, adata);
+}
+
+static int agdi_remove(struct platform_device *pdev)
+{
+ struct agdi_data *adata = dev_get_platdata(&pdev->dev);
+ int err, i;
+
+ err = sdei_event_disable(adata->sdei_event);
+ if (err)
+ return err;
+
+ for (i = 0; i < 3; i++) {
+ err = sdei_event_unregister(adata->sdei_event);
+ if (err != -EINPROGRESS)
+ break;
+
+ schedule();
+ }
+
+ return err;
+}
+
+static struct platform_driver agdi_driver = {
+ .driver = {
+ .name = "agdi",
+ },
+ .probe = agdi_probe,
+ .remove = agdi_remove,
+};
+
+void __init acpi_agdi_init(void)
+{
+ struct acpi_table_agdi *agdi_table;
+ struct agdi_data pdata;
+ struct platform_device *pdev;
+ acpi_status status;
+
+ status = acpi_get_table(ACPI_SIG_AGDI, 0,
+ (struct acpi_table_header **) &agdi_table);
+ if (ACPI_FAILURE(status))
+ return;
+
+ if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) {
+ pr_warn("Interrupt signaling is not supported");
+ goto err_put_table;
+ }
+
+ pdata.sdei_event = agdi_table->sdei_event;
+
+ pdev = platform_device_register_data(NULL, "agdi", 0, &pdata, sizeof(pdata));
+ if (IS_ERR(pdev))
+ goto err_put_table;
+
+ if (platform_driver_register(&agdi_driver))
+ platform_device_unregister(pdev);
+
+err_put_table:
+ acpi_put_table((struct acpi_table_header *)agdi_table);
+}
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index eaa511fc9c66..87b93f4df0cf 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -26,6 +26,7 @@
#include <asm/mpspec.h>
#include <linux/dmi.h>
#endif
+#include <linux/acpi_agdi.h>
#include <linux/acpi_iort.h>
#include <linux/acpi_viot.h>
#include <linux/pci.h>
@@ -1386,6 +1387,7 @@ static int __init acpi_init(void)
acpi_debugger_init();
acpi_setup_sb_notify_handler();
acpi_viot_init();
+ acpi_agdi_init();
return 0;
}
diff --git a/include/linux/acpi_agdi.h b/include/linux/acpi_agdi.h
new file mode 100644
index 000000000000..f477f0b452fa
--- /dev/null
+++ b/include/linux/acpi_agdi.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ACPI_AGDI_H__
+#define __ACPI_AGDI_H__
+
+#include <linux/acpi.h>
+
+#ifdef CONFIG_ACPI_AGDI
+void __init acpi_agdi_init(void);
+#else
+static inline void acpi_agdi_init(void) {}
+#endif
+#endif /* __ACPI_AGDI_H__ */
--
2.17.1
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