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It allows an admin to issue diagnostic dump and reset via an SDEI event or an interrupt. This patch adds support to ACPI/AGDI tables. [0] https://developer.arm.com/documentation/den0093/latest/ Signed-off-by: Ilkka Koskinen --- drivers/acpi/tables.c | 2 +- include/acpi/actbl2.h | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index 71419eb16e09..5e3169bcb9fb 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -500,7 +500,7 @@ static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = { ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, - ACPI_SIG_NHLT }; + ACPI_SIG_NHLT, ACPI_SIG_AGDI }; #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h index 71ca090fd61b..66ca85b9f5fe 100644 --- a/include/acpi/actbl2.h +++ b/include/acpi/actbl2.h @@ -24,6 +24,7 @@ * file. Useful because they make it more difficult to inadvertently type in * the wrong signature. */ +#define ACPI_SIG_AGDI "AGDI" /* ARM Generic Diagnostic Dump and Reset Device Interface */ #define ACPI_SIG_BDAT "BDAT" /* BIOS Data ACPI Table */ #define ACPI_SIG_IORT "IORT" /* IO Remapping Table */ #define ACPI_SIG_IVRS "IVRS" /* I/O Virtualization Reporting Structure */ @@ -237,6 +238,25 @@ typedef struct acpi_aest_node_interrupt { #define ACPI_AEST_NODE_ERROR_RECOVERY 1 #define ACPI_AEST_XRUPT_RESERVED 2 /* 2 and above are reserved */ +/******************************************************************************* + * AGDI - Generic Diagnostic Dump and Reset Device Interface + * + * Document number: ARM DEN0093 + * + *******************************************************************************/ + +struct acpi_table_agdi { + struct acpi_table_header header; + u8 flags; + u8 reserved[3]; + u32 sdei_event; + u32 gsiv; +}; + +/* Masks for Flags field above for AGDI table */ + +#define ACPI_AGDI_SIGNALING_MODE (1) + /******************************************************************************* * * BDAT - BIOS Data ACPI Table From patchwork Tue Dec 14 04:40:36 2021 Content-Type: text/plain; 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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 --- drivers/acpi/arm64/Kconfig | 8 +++ drivers/acpi/arm64/Makefile | 1 + drivers/acpi/arm64/agdi.c | 125 ++++++++++++++++++++++++++++++++++++ 3 files changed, 134 insertions(+) create mode 100644 drivers/acpi/arm64/agdi.c diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig index 6dba187f4f2e..24869ba5b365 100644 --- a/drivers/acpi/arm64/Kconfig +++ b/drivers/acpi/arm64/Kconfig @@ -8,3 +8,11 @@ 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. 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..6525ccbae5c1 --- /dev/null +++ b/drivers/acpi/arm64/agdi.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * This file implements handling of + * Arm Generic Diagnostic Dump and Reset Interface table (AGDI) + * + * Copyright (c) 2021, Ampere Computing LLC + */ + +#define pr_fmt(fmt) "ACPI: AGDI: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +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; + + 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 = platform_get_drvdata(pdev); + + sdei_event_disable(adata->sdei_event); + sdei_event_unregister(adata->sdei_event); + + return 0; +} + +static struct platform_driver agdi_driver = { + .driver = { + .name = "agdi", + }, + .probe = agdi_probe, + .remove = agdi_remove, +}; + +static int __init agdi_init(void) +{ + int ret; + acpi_status status; + struct acpi_table_agdi *agdi_table; + struct agdi_data pdata; + struct platform_device *pdev; + + if (acpi_disabled) + return 0; + + status = acpi_get_table(ACPI_SIG_AGDI, 0, + (struct acpi_table_header **) &agdi_table); + if (ACPI_FAILURE(status)) + return -ENODEV; + + if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) { + pr_warn("Interrupt signaling is not supported"); + ret = -ENODEV; + 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)) { + ret = PTR_ERR(pdev); + goto err_put_table; + } + + ret = platform_driver_register(&agdi_driver); + if (ret) + goto err_device_unregister; + + acpi_put_table((struct acpi_table_header *)agdi_table); + return 0; + +err_device_unregister: + platform_device_unregister(pdev); +err_put_table: + acpi_put_table((struct acpi_table_header *)agdi_table); + return ret; +} +device_initcall(agdi_init);