[PATCH v5 RESEND 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

[PATCH v5 RESEND 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

[Ilkka Koskinen]

Hi Lorenzo,

Would you prefer this version, which doesn't have platform device/driver
any more?

--Ilkka


----

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 bleeding-edge (9db71e8e3027)

I also tested it works on top of Shuai Xue's new patches in bleeding-edge branch (c6f4ba2d2b9a)

From v1:
     * Moved pdata to the stack and dropped unnecessary kzalloc() in agdi_init()
     * Changed the ACPICA patch upstreaming order comment in the paragraph above

From v2:
     * The first patch was split. The most of it was merged to ACPICA project
       at first and later ported to linux-acpi
       (fd919e37cb15914c6fe13e13d530a4f732407c6d). The rest are in the first
       patch.

From v3:
     Fixed:
	* Moved header files in alphabetical order and removed unnecessary ones

From v4:
	* Platform device/driver stuff removed
	* acpi_agdi_init() call moved from device_initcall to acpi_init() 
	* Slightly modified Kconfig text to keep checkpatch happy

Ilkka Koskinen (2):
  ACPI: tables: Add AGDI to the list of known table signatures
  ACPI: AGDI: Add support for Arm Generic Diagnostic Dump and Reset
    device

 drivers/acpi/arm64/Kconfig  | 10 +++++++
 drivers/acpi/arm64/Makefile |  1 +
 drivers/acpi/arm64/agdi.c   | 52 +++++++++++++++++++++++++++++++++++++
 drivers/acpi/bus.c          |  2 ++
 drivers/acpi/tables.c       |  2 +-
 include/linux/acpi_agdi.h   | 13 ++++++++++
 6 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/arm64/agdi.c
 create mode 100644 include/linux/acpi_agdi.h

-- 
2.17.1

[PATCH v5 RESEND 1/2] ACPI: tables: Add AGDI to the list of known table signatures

[Ilkka Koskinen]

Add AGDI to the list of known ACPI table signatures to allow the
kernel to recognize it when upgrading tables via initrd.

Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/acpi/tables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 369eb998c3d1..ceee808f7f2a 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -545,7 +545,7 @@ 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_AEST, ACPI_SIG_CEDT };
+	ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI };
 
 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 
-- 
2.17.1

[PATCH v5 RESEND 2/2] ACPI: AGDI: Add support for Arm Generic Diagnostic Dump and Reset device

[Ilkka Koskinen]

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@os.amperecomputing.com>
---
 drivers/acpi/arm64/Kconfig  | 10 +++++++
 drivers/acpi/arm64/Makefile |  1 +
 drivers/acpi/arm64/agdi.c   | 52 +++++++++++++++++++++++++++++++++++++
 drivers/acpi/bus.c          |  2 ++
 include/linux/acpi_agdi.h   | 13 ++++++++++
 5 files changed, 78 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..28916650d834
--- /dev/null
+++ b/drivers/acpi/arm64/agdi.c
@@ -0,0 +1,52 @@
+// 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>
+
+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;
+}
+
+void __init acpi_agdi_init(void)
+{
+	struct acpi_table_agdi *agdi_table;
+	acpi_status status;
+	int sdei_event;
+
+	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");
+		acpi_put_table((struct acpi_table_header *)agdi_table);
+		return;
+	}
+
+	sdei_event = agdi_table->sdei_event;
+	acpi_put_table((struct acpi_table_header *)agdi_table);
+
+	if (sdei_event_register(sdei_event, agdi_sdei_handler, NULL)) {
+		pr_err("Failed to register for SDEI event %d", sdei_event);
+		return;
+	}
+
+	if (sdei_event_enable(sdei_event)) {
+		pr_err("Failed to enable SDEI event %d\n", sdei_event);
+		sdei_event_unregister(sdei_event);
+		return;
+	}
+}
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

Re: [PATCH v5 RESEND 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

[Lorenzo Pieralisi]

On Thu, Mar 03, 2022 at 09:40:01PM -0800, Ilkka Koskinen wrote:
> Hi Lorenzo,
> 
> Would you prefer this version, which doesn't have platform
> device/driver any more?

I thought about that and in order to keep consistency it is better to
keep the platform device model, so please resend the latest version
platform device based and I will ACK it (hopefully it is not too late
for v5.18).

Please note before resending it that sdei_event_unregister() requires a
retry loop since it can return -EINPROGRESS (see sdei_unregister_ghes()).

Thanks,
Lorenzo

> 
> --Ilkka
> 
> 
> ----
> 
> 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 bleeding-edge (9db71e8e3027)
> 
> I also tested it works on top of Shuai Xue's new patches in bleeding-edge branch (c6f4ba2d2b9a)
> 
> From v1:
>      * Moved pdata to the stack and dropped unnecessary kzalloc() in agdi_init()
>      * Changed the ACPICA patch upstreaming order comment in the paragraph above
> 
> From v2:
>      * The first patch was split. The most of it was merged to ACPICA project
>        at first and later ported to linux-acpi
>        (fd919e37cb15914c6fe13e13d530a4f732407c6d). The rest are in the first
>        patch.
> 
> From v3:
>      Fixed:
> 	* Moved header files in alphabetical order and removed unnecessary ones
> 
> From v4:
> 	* Platform device/driver stuff removed
> 	* acpi_agdi_init() call moved from device_initcall to acpi_init() 
> 	* Slightly modified Kconfig text to keep checkpatch happy
> 
> Ilkka Koskinen (2):
>   ACPI: tables: Add AGDI to the list of known table signatures
>   ACPI: AGDI: Add support for Arm Generic Diagnostic Dump and Reset
>     device
> 
>  drivers/acpi/arm64/Kconfig  | 10 +++++++
>  drivers/acpi/arm64/Makefile |  1 +
>  drivers/acpi/arm64/agdi.c   | 52 +++++++++++++++++++++++++++++++++++++
>  drivers/acpi/bus.c          |  2 ++
>  drivers/acpi/tables.c       |  2 +-
>  include/linux/acpi_agdi.h   | 13 ++++++++++
>  6 files changed, 79 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/acpi/arm64/agdi.c
>  create mode 100644 include/linux/acpi_agdi.h
> 
> -- 
> 2.17.1
> 

Re: [PATCH v5 RESEND 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

[Ilkka Koskinen]

On Fri, 4 Mar 2022, Lorenzo Pieralisi wrote:
> On Thu, Mar 03, 2022 at 09:40:01PM -0800, Ilkka Koskinen wrote:
>> Hi Lorenzo,
>>
>> Would you prefer this version, which doesn't have platform
>> device/driver any more?
>
> I thought about that and in order to keep consistency it is better to
> keep the platform device model, so please resend the latest version
> platform device based and I will ACK it (hopefully it is not too late
> for v5.18).

Sure, I can do that. Just one question, do you still prefer agdi_init() 
getting called from acpi_init() or via device_initcall()?

> Please note before resending it that sdei_event_unregister() requires a
> retry loop since it can return -EINPROGRESS (see sdei_unregister_ghes()).

Thanks for pointing out, I'll fix it.

Cheers, Ilkka


>
> Thanks,
> Lorenzo
>
>>
>> --Ilkka
>>
>>
>> ----
>>
>> 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 bleeding-edge (9db71e8e3027)
>>
>> I also tested it works on top of Shuai Xue's new patches in bleeding-edge branch (c6f4ba2d2b9a)
>>
>> From v1:
>>      * Moved pdata to the stack and dropped unnecessary kzalloc() in agdi_init()
>>      * Changed the ACPICA patch upstreaming order comment in the paragraph above
>>
>> From v2:
>>      * The first patch was split. The most of it was merged to ACPICA project
>>        at first and later ported to linux-acpi
>>        (fd919e37cb15914c6fe13e13d530a4f732407c6d). The rest are in the first
>>        patch.
>>
>> From v3:
>>      Fixed:
>> 	* Moved header files in alphabetical order and removed unnecessary ones
>>
>> From v4:
>> 	* Platform device/driver stuff removed
>> 	* acpi_agdi_init() call moved from device_initcall to acpi_init()
>> 	* Slightly modified Kconfig text to keep checkpatch happy
>>
>> Ilkka Koskinen (2):
>>   ACPI: tables: Add AGDI to the list of known table signatures
>>   ACPI: AGDI: Add support for Arm Generic Diagnostic Dump and Reset
>>     device
>>
>>  drivers/acpi/arm64/Kconfig  | 10 +++++++
>>  drivers/acpi/arm64/Makefile |  1 +
>>  drivers/acpi/arm64/agdi.c   | 52 +++++++++++++++++++++++++++++++++++++
>>  drivers/acpi/bus.c          |  2 ++
>>  drivers/acpi/tables.c       |  2 +-
>>  include/linux/acpi_agdi.h   | 13 ++++++++++
>>  6 files changed, 79 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/acpi/arm64/agdi.c
>>  create mode 100644 include/linux/acpi_agdi.h
>>
>> --
>> 2.17.1
>>
>

Re: [PATCH v5 RESEND 0/2] ACPI: Arm Generic Diagnostic Dump and Reset device

[Lorenzo Pieralisi]

On Mon, Mar 07, 2022 at 02:29:10PM -0800, Ilkka Koskinen wrote:

[...]

> > > Would you prefer this version, which doesn't have platform
> > > device/driver any more?
> > 
> > I thought about that and in order to keep consistency it is better to
> > keep the platform device model, so please resend the latest version
> > platform device based and I will ACK it (hopefully it is not too late
> > for v5.18).
> 
> Sure, I can do that. Just one question, do you still prefer agdi_init()
> getting called from acpi_init() or via device_initcall()?

In acpi_init(), thanks.

Lorenzo