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@xxxxxxxxxxxxxxxxxxxxxx> Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> --- 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
