LinuxLists.cc - [PATCH 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

2021-12-03 02:44:01

Subject: [PATCH 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

Arm Generic Diagnostic Dump and Reset device enables a maintainer to
request OS to perform a diagnostic dump and reset a system via SDEI
event or an interrupt. This patchset adds support for the SDEI path.

I do have a patch to enable the interrupt path as well but I'm holding
it back since AGDI table is missing interrupt configuration fields
(trigger type etc.).

The recently published specification is available at
https://developer.arm.com/documentation/den0093/latest

The patchset was tested on Ampere Altra/Mt. Jade.

The patchset applies on top of
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm master
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core

What's the process with new ACPI tables? Should I submit a patch to
ACPICA at first or is this fine?

Ilkka Koskinen (2):
ACPI: AGDI: Add AGDI tables to drivers/acpi
ACPI: AGDI: Add driver for Arm Generic Diagnostic Dump and Reset
device

drivers/acpi/arm64/Kconfig | 8 +++
drivers/acpi/arm64/Makefile | 1 +
drivers/acpi/arm64/agdi.c | 133 ++++++++++++++++++++++++++++++++++++
drivers/acpi/tables.c | 2 +-
include/acpi/actbl2.h | 20 ++++++
5 files changed, 163 insertions(+), 1 deletion(-)
create mode 100644 drivers/acpi/arm64/agdi.c

--
2.17.1

2021-12-03 02:44:04

by Ilkka Koskinen

[permalink] [raw]

Subject: [PATCH 1/2] ACPI: AGDI: Add AGDI tables to drivers/acpi

2021-12-03 02:44:09

by Ilkka Koskinen

[permalink] [raw]

Subject: [PATCH 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 <[email protected]>
---
drivers/acpi/arm64/Kconfig | 8 +++
drivers/acpi/arm64/Makefile | 1 +
drivers/acpi/arm64/agdi.c | 133 ++++++++++++++++++++++++++++++++++++
3 files changed, 142 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..cdd8811df3d5
--- /dev/null
+++ b/drivers/acpi/arm64/agdi.c
@@ -0,0 +1,133 @@
+// 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 <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/arm_sdei.h>
+#include <linux/io.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;
+
+ 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;
+
+ pdata = kzalloc(sizeof(*pdata), GFP_ATOMIC);
+ if (!pdata) {
+ ret = -ENOMEM;
+ goto err_put_table;
+ }
+
+ if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) {
+ pr_warn("Interrupt signaling is not supported");
+ ret = -ENODEV;
+ goto err_free_pdata;
+ }
+
+ 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_free_pdata;
+ }
+
+ 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_free_pdata:
+ kfree(pdata);
+err_put_table:
+ acpi_put_table((struct acpi_table_header *)agdi_table);
+ return ret;
+}
+device_initcall(agdi_init);
--
2.17.1

2021-12-09 16:36:34

by Russell King (Oracle)

[permalink] [raw]

Subject: Re: [PATCH 2/2] ACPI: AGDI: Add driver for Arm Generic Diagnostic Dump and Reset device

Hi,

On Thu, Dec 02, 2021 at 06:43:11PM -0800, Ilkka Koskinen wrote:
> +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;
> +
> + pdata = kzalloc(sizeof(*pdata), GFP_ATOMIC);

Why does this need to be GFP_ATOMIC? Also, struct agdi_data is a single
int in size, why do you need to kzalloc() it?

> + if (!pdata) {
> + ret = -ENOMEM;
> + goto err_put_table;
> + }
> +
> + if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) {
> + pr_warn("Interrupt signaling is not supported");
> + ret = -ENODEV;
> + goto err_free_pdata;
> + }
> +
> + pdata->sdei_event = agdi_table->sdei_event;
> +
> + pdev = platform_device_register_data(NULL, "agdi", 0, pdata, sizeof(*pdata));

platform_device_register_data() uses kmemdup() internally with the
platform data, meaning it takes a copy of the platform data. There is
no need for the pdata allocation to persist past this point. Hence,
given that it is a single int in size, you may as well put
"struct agdi_data" on the stack.

Thanks.

--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

2021-12-10 08:32:37

by Ilkka Koskinen

[permalink] [raw]

Subject: Re: [PATCH 2/2] ACPI: AGDI: Add driver for Arm Generic Diagnostic Dump and Reset device

Hi,

Thanks for reviewing the patch

On Thu, 9 Dec 2021, Russell King (Oracle) wrote:
> Hi,
>
> On Thu, Dec 02, 2021 at 06:43:11PM -0800, Ilkka Koskinen wrote:
>> +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;
>> +
>> + pdata = kzalloc(sizeof(*pdata), GFP_ATOMIC);
>
> Why does this need to be GFP_ATOMIC? Also, struct agdi_data is a single
> int in size, why do you need to kzalloc() it?

There's no reason for that. It should obviously be GFP_KERNEL

>
>> + if (!pdata) {
>> + ret = -ENOMEM;
>> + goto err_put_table;
>> + }
>> +
>> + if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) {
>> + pr_warn("Interrupt signaling is not supported");
>> + ret = -ENODEV;
>> + goto err_free_pdata;
>> + }
>> +
>> + pdata->sdei_event = agdi_table->sdei_event;
>> +
>> + pdev = platform_device_register_data(NULL, "agdi", 0, pdata, sizeof(*pdata));
>
> platform_device_register_data() uses kmemdup() internally with the
> platform data, meaning it takes a copy of the platform data. There is
> no need for the pdata allocation to persist past this point. Hence,
> given that it is a single int in size, you may as well put
> "struct agdi_data" on the stack.

I somehow missed kmemdup() part. I remove the allocation and move pdata to
the stack instead.

Thanks,
Ilkka

>
> Thanks.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
>