[PATCH v3 0/3] ACPI: APEI: GHES: Add device-managed notifier helper and NVIDIA CPER handler

[PATCH v3 0/3] ACPI: APEI: GHES: Add device-managed notifier helper and NVIDIA CPER handler

[Kai-Heng Feng]

NVIDIA DGX and HGX platforms provide an ACPI device (NVDA2012) alongside
the GHES error source. The device does not generate the error records
itself; its purpose is to allow the vendor CPER handler driver to load
automatically via ACPI enumeration rather than manual module loading.

The series introduces devm_ghes_register_vendor_record_notifier() helper,
let HiSilicon PCI driver and new NVIDA GHES driver use the new helper.

Kai-Heng Feng (3):
  ACPI: APEI: GHES: Add devm_ghes_register_vendor_record_notifier()
  PCI: hisi: Use devm_ghes_register_vendor_record_notifier()
  ACPI: APEI: GHES: Add NVIDIA vendor CPER record handler

 MAINTAINERS                              |   6 +
 drivers/acpi/apei/Kconfig                |  14 +++
 drivers/acpi/apei/Makefile               |   1 +
 drivers/acpi/apei/ghes-nvidia.c          | 149 +++++++++++++++++++++++
 drivers/acpi/apei/ghes.c                 |  18 +++
 drivers/pci/controller/pcie-hisi-error.c |  12 +-
 include/acpi/ghes.h                      |  11 ++
 7 files changed, 200 insertions(+), 11 deletions(-)
 create mode 100644 drivers/acpi/apei/ghes-nvidia.c

-- 
2.50.1 (Apple Git-155)

[PATCH v3 1/3] ACPI: APEI: GHES: Add devm_ghes_register_vendor_record_notifier()

[Kai-Heng Feng]

Add a device-managed wrapper around ghes_register_vendor_record_notifier()
so drivers can avoid manual cleanup on device removal or probe failure.

Cc: Shiju Jose <shiju.jose@huawei.com>
Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>
---
v3:
 - Change patch title
 - Move documentation to header file.
v2:
 - New patch.

 drivers/acpi/apei/ghes.c | 18 ++++++++++++++++++
 include/acpi/ghes.h      | 11 +++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 8acd2742bb27..3236a3ce79d6 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -689,6 +689,24 @@ void ghes_unregister_vendor_record_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
 
+static void ghes_vendor_record_notifier_destroy(void *nb)
+{
+	ghes_unregister_vendor_record_notifier(nb);
+}
+
+int devm_ghes_register_vendor_record_notifier(struct device *dev,
+					      struct notifier_block *nb)
+{
+	int ret;
+
+	ret = ghes_register_vendor_record_notifier(nb);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, ghes_vendor_record_notifier_destroy, nb);
+}
+EXPORT_SYMBOL_GPL(devm_ghes_register_vendor_record_notifier);
+
 static void ghes_vendor_record_work_func(struct work_struct *work)
 {
 	struct ghes_vendor_record_entry *entry;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 7bea522c0657..8d7e5caef3f1 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -71,6 +71,17 @@ int ghes_register_vendor_record_notifier(struct notifier_block *nb);
  */
 void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
 
+/**
+ * devm_ghes_register_vendor_record_notifier - device-managed vendor
+ * record notifier registration.
+ * @dev: device that owns the notifier lifetime
+ * @nb: pointer to the notifier_block structure of the vendor record handler
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int devm_ghes_register_vendor_record_notifier(struct device *dev,
+					      struct notifier_block *nb);
+
 struct list_head *ghes_get_devices(void);
 
 void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
-- 
2.50.1 (Apple Git-155)

Re: [PATCH v3 1/3] ACPI: APEI: GHES: Add devm_ghes_register_vendor_record_notifier()

[Breno Leitao]

On Mon, Mar 30, 2026 at 05:41:55PM +0800, Kai-Heng Feng wrote:
> Add a device-managed wrapper around ghes_register_vendor_record_notifier()
> so drivers can avoid manual cleanup on device removal or probe failure.
> 
> Cc: Shiju Jose <shiju.jose@huawei.com>
> Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
> Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>

Reviewed-by: Breno Leitao <leitao@debian.org>

RE: [PATCH v3 1/3] ACPI: APEI: GHES: Add devm_ghes_register_vendor_record_notifier()

[Shiju Jose]

>-----Original Message-----
>From: Kai-Heng Feng <kaihengf@nvidia.com>
>Sent: 30 March 2026 10:42
>To: rafael@kernel.org
>Cc: Jonathan Cameron <jonathan.cameron@huawei.com>;
>helgaas@kernel.org; Guohanjun (Hanjun Guo) <guohanjun@huawei.com>;
>linux-kernel@vger.kernel.org; linux-acpi@vger.kernel.org; linux-
>pci@vger.kernel.org; acpica-devel@lists.linux.dev; linux-
>hardening@vger.kernel.org; Kai-Heng Feng <kaihengf@nvidia.com>; Shiju Jose
><shiju.jose@huawei.com>; Tony Luck <tony.luck@intel.com>; Borislav Petkov
><bp@alien8.de>; Mauro Carvalho Chehab <mchehab@kernel.org>; Shuai Xue
><xueshuai@linux.alibaba.com>; Len Brown <lenb@kernel.org>; Robert Moore
><robert.moore@intel.com>; Fabio M. De Francesco
><fabio.m.de.francesco@linux.intel.com>; Breno Leitao <leitao@debian.org>;
>Jason Tian <jason@os.amperecomputing.com>
>Subject: [PATCH v3 1/3] ACPI: APEI: GHES: Add
>devm_ghes_register_vendor_record_notifier()
>
>Add a device-managed wrapper around
>ghes_register_vendor_record_notifier()
>so drivers can avoid manual cleanup on device removal or probe failure.
>
>Cc: Shiju Jose <shiju.jose@huawei.com>
>Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
>Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>

Reviewed-by: Shiju Jose <shiju.jose@huawei.com>
>---
>v3:
> - Change patch title
> - Move documentation to header file.
>v2:
> - New patch.
>
> drivers/acpi/apei/ghes.c | 18 ++++++++++++++++++
> include/acpi/ghes.h      | 11 +++++++++++
> 2 files changed, 29 insertions(+)
>
>diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index
>8acd2742bb27..3236a3ce79d6 100644
>--- a/drivers/acpi/apei/ghes.c
>+++ b/drivers/acpi/apei/ghes.c
>@@ -689,6 +689,24 @@ void ghes_unregister_vendor_record_notifier(struct
>notifier_block *nb)  }
>EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
>
>+static void ghes_vendor_record_notifier_destroy(void *nb) {
>+	ghes_unregister_vendor_record_notifier(nb);
>+}
>+
>+int devm_ghes_register_vendor_record_notifier(struct device *dev,
>+					      struct notifier_block *nb)
>+{
>+	int ret;
>+
>+	ret = ghes_register_vendor_record_notifier(nb);
>+	if (ret)
>+		return ret;
>+
>+	return devm_add_action_or_reset(dev,
>+ghes_vendor_record_notifier_destroy, nb); }
>+EXPORT_SYMBOL_GPL(devm_ghes_register_vendor_record_notifier);
>+
> static void ghes_vendor_record_work_func(struct work_struct *work)  {
> 	struct ghes_vendor_record_entry *entry; diff --git
>a/include/acpi/ghes.h b/include/acpi/ghes.h index
>7bea522c0657..8d7e5caef3f1 100644
>--- a/include/acpi/ghes.h
>+++ b/include/acpi/ghes.h
>@@ -71,6 +71,17 @@ int ghes_register_vendor_record_notifier(struct
>notifier_block *nb);
>  */
> void ghes_unregister_vendor_record_notifier(struct notifier_block *nb);
>
>+/**
>+ * devm_ghes_register_vendor_record_notifier - device-managed vendor
>+ * record notifier registration.
>+ * @dev: device that owns the notifier lifetime
>+ * @nb: pointer to the notifier_block structure of the vendor record
>+handler
>+ *
>+ * Return: 0 on success, negative errno on failure.
>+ */
>+int devm_ghes_register_vendor_record_notifier(struct device *dev,
>+					      struct notifier_block *nb);
>+
> struct list_head *ghes_get_devices(void);
>
> void ghes_estatus_pool_region_free(unsigned long addr, u32 size);
>--
>2.50.1 (Apple Git-155)
>

Re: [PATCH v3 1/3] ACPI: APEI: GHES: Add devm_ghes_register_vendor_record_notifier()

[Shuai Xue]

On 3/30/26 5:41 PM, Kai-Heng Feng wrote:
> Add a device-managed wrapper around ghes_register_vendor_record_notifier()
> so drivers can avoid manual cleanup on device removal or probe failure.
> 
> Cc: Shiju Jose <shiju.jose@huawei.com>
> Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
> Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>

LGTM.

Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>

Thanks.
Shuai

[PATCH v3 2/3] PCI: hisi: Use devm_ghes_register_vendor_record_notifier()

[Kai-Heng Feng]

Switch to the device-managed variant so the notifier is automatically
unregistered on device removal, allowing the open-coded remove callback
to be dropped entirely.

Cc: Shiju Jose <shiju.jose@huawei.com>
Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>
---
v3:
 - No change.
v2:
 - New patch.

 drivers/pci/controller/pcie-hisi-error.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/pci/controller/pcie-hisi-error.c b/drivers/pci/controller/pcie-hisi-error.c
index aaf1ed2b6e59..36be86d827a8 100644
--- a/drivers/pci/controller/pcie-hisi-error.c
+++ b/drivers/pci/controller/pcie-hisi-error.c
@@ -287,25 +287,16 @@ static int hisi_pcie_error_handler_probe(struct platform_device *pdev)
 
 	priv->nb.notifier_call = hisi_pcie_notify_error;
 	priv->dev = &pdev->dev;
-	ret = ghes_register_vendor_record_notifier(&priv->nb);
+	ret = devm_ghes_register_vendor_record_notifier(&pdev->dev, &priv->nb);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"Failed to register hisi pcie controller error handler with apei\n");
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, priv);
-
 	return 0;
 }
 
-static void hisi_pcie_error_handler_remove(struct platform_device *pdev)
-{
-	struct hisi_pcie_error_private *priv = platform_get_drvdata(pdev);
-
-	ghes_unregister_vendor_record_notifier(&priv->nb);
-}
-
 static const struct acpi_device_id hisi_pcie_acpi_match[] = {
 	{ "HISI0361", 0 },
 	{ }
@@ -317,7 +308,6 @@ static struct platform_driver hisi_pcie_error_handler_driver = {
 		.acpi_match_table = hisi_pcie_acpi_match,
 	},
 	.probe		= hisi_pcie_error_handler_probe,
-	.remove		= hisi_pcie_error_handler_remove,
 };
 module_platform_driver(hisi_pcie_error_handler_driver);
 
-- 
2.50.1 (Apple Git-155)

Re: [PATCH v3 2/3] PCI: hisi: Use devm_ghes_register_vendor_record_notifier()

[Manivannan Sadhasivam]

On Mon, Mar 30, 2026 at 05:41:56PM +0800, Kai-Heng Feng wrote:
> Switch to the device-managed variant so the notifier is automatically
> unregistered on device removal, allowing the open-coded remove callback
> to be dropped entirely.
> 
> Cc: Shiju Jose <shiju.jose@huawei.com>
> Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
> Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>

Acked-by: Manivannan Sadhasivam <mani@kernel.org>

Since there is an API dependency, feel free to take it through ACPI tree.

- Mani

> ---
> v3:
>  - No change.
> v2:
>  - New patch.
> 
>  drivers/pci/controller/pcie-hisi-error.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-hisi-error.c b/drivers/pci/controller/pcie-hisi-error.c
> index aaf1ed2b6e59..36be86d827a8 100644
> --- a/drivers/pci/controller/pcie-hisi-error.c
> +++ b/drivers/pci/controller/pcie-hisi-error.c
> @@ -287,25 +287,16 @@ static int hisi_pcie_error_handler_probe(struct platform_device *pdev)
>  
>  	priv->nb.notifier_call = hisi_pcie_notify_error;
>  	priv->dev = &pdev->dev;
> -	ret = ghes_register_vendor_record_notifier(&priv->nb);
> +	ret = devm_ghes_register_vendor_record_notifier(&pdev->dev, &priv->nb);
>  	if (ret) {
>  		dev_err(&pdev->dev,
>  			"Failed to register hisi pcie controller error handler with apei\n");
>  		return ret;
>  	}
>  
> -	platform_set_drvdata(pdev, priv);
> -
>  	return 0;
>  }
>  
> -static void hisi_pcie_error_handler_remove(struct platform_device *pdev)
> -{
> -	struct hisi_pcie_error_private *priv = platform_get_drvdata(pdev);
> -
> -	ghes_unregister_vendor_record_notifier(&priv->nb);
> -}
> -
>  static const struct acpi_device_id hisi_pcie_acpi_match[] = {
>  	{ "HISI0361", 0 },
>  	{ }
> @@ -317,7 +308,6 @@ static struct platform_driver hisi_pcie_error_handler_driver = {
>  		.acpi_match_table = hisi_pcie_acpi_match,
>  	},
>  	.probe		= hisi_pcie_error_handler_probe,
> -	.remove		= hisi_pcie_error_handler_remove,
>  };
>  module_platform_driver(hisi_pcie_error_handler_driver);
>  
> -- 
> 2.50.1 (Apple Git-155)
> 

-- 
மணிவண்ணன் சதாசிவம்

RE: [PATCH v3 2/3] PCI: hisi: Use devm_ghes_register_vendor_record_notifier()

[Shiju Jose]

>-----Original Message-----
>From: Kai-Heng Feng <kaihengf@nvidia.com>
>Sent: 30 March 2026 10:42
>To: rafael@kernel.org
>Cc: Jonathan Cameron <jonathan.cameron@huawei.com>;
>helgaas@kernel.org; Guohanjun (Hanjun Guo) <guohanjun@huawei.com>;
>linux-kernel@vger.kernel.org; linux-acpi@vger.kernel.org; linux-
>pci@vger.kernel.org; acpica-devel@lists.linux.dev; linux-
>hardening@vger.kernel.org; Kai-Heng Feng <kaihengf@nvidia.com>; Shiju Jose
><shiju.jose@huawei.com>; Lorenzo Pieralisi <lpieralisi@kernel.org>; Krzysztof
>Wilczyński <kwilczynski@kernel.org>; Manivannan Sadhasivam
><mani@kernel.org>; Rob Herring <robh@kernel.org>; Bjorn Helgaas
><bhelgaas@google.com>
>Subject: [PATCH v3 2/3] PCI: hisi: Use
>devm_ghes_register_vendor_record_notifier()
>
>Switch to the device-managed variant so the notifier is automatically
>unregistered on device removal, allowing the open-coded remove callback to
>be dropped entirely.
>
>Cc: Shiju Jose <shiju.jose@huawei.com>
>Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
>Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>

Reviewed-by: Shiju Jose <shiju.jose@huawei.com>
>---
>v3:
> - No change.
>v2:
> - New patch.
>
> drivers/pci/controller/pcie-hisi-error.c | 12 +-----------
> 1 file changed, 1 insertion(+), 11 deletions(-)
>
>diff --git a/drivers/pci/controller/pcie-hisi-error.c b/drivers/pci/controller/pcie-
>hisi-error.c
>index aaf1ed2b6e59..36be86d827a8 100644
>--- a/drivers/pci/controller/pcie-hisi-error.c
>+++ b/drivers/pci/controller/pcie-hisi-error.c
>@@ -287,25 +287,16 @@ static int hisi_pcie_error_handler_probe(struct
>platform_device *pdev)
>
> 	priv->nb.notifier_call = hisi_pcie_notify_error;
> 	priv->dev = &pdev->dev;
>-	ret = ghes_register_vendor_record_notifier(&priv->nb);
>+	ret = devm_ghes_register_vendor_record_notifier(&pdev->dev,
>+&priv->nb);
> 	if (ret) {
> 		dev_err(&pdev->dev,
> 			"Failed to register hisi pcie controller error handler
>with apei\n");
> 		return ret;
> 	}
>
>-	platform_set_drvdata(pdev, priv);
>-
> 	return 0;
> }
>
>-static void hisi_pcie_error_handler_remove(struct platform_device *pdev) -{
>-	struct hisi_pcie_error_private *priv = platform_get_drvdata(pdev);
>-
>-	ghes_unregister_vendor_record_notifier(&priv->nb);
>-}
>-
> static const struct acpi_device_id hisi_pcie_acpi_match[] = {
> 	{ "HISI0361", 0 },
> 	{ }
>@@ -317,7 +308,6 @@ static struct platform_driver
>hisi_pcie_error_handler_driver = {
> 		.acpi_match_table = hisi_pcie_acpi_match,
> 	},
> 	.probe		= hisi_pcie_error_handler_probe,
>-	.remove		= hisi_pcie_error_handler_remove,
> };
> module_platform_driver(hisi_pcie_error_handler_driver);
>
>--
>2.50.1 (Apple Git-155)
>

[PATCH v3 3/3] ACPI: APEI: GHES: Add NVIDIA vendor CPER record handler

[Kai-Heng Feng]

Add support for decoding NVIDIA-specific CPER sections delivered via
the APEI GHES vendor record notifier chain. NVIDIA hardware generates
vendor-specific CPER sections containing error signatures and diagnostic
register dumps. This implementation registers a notifier_block with the
GHES vendor record notifier and decodes these sections, printing error
details via dev_info().

The driver binds to ACPI device NVDA2012, present on NVIDIA server
platforms. The NVIDIA CPER section contains a fixed header with error
metadata (signature, error type, severity, socket) followed by
variable-length register address-value pairs for hardware diagnostics.

This work is based on libcper [0].

Example output:
nvidia-ghes NVDA2012:00: NVIDIA CPER section, error_data_length: 544
nvidia-ghes NVDA2012:00: signature: CMET-INFO
nvidia-ghes NVDA2012:00: error_type: 0
nvidia-ghes NVDA2012:00: error_instance: 0
nvidia-ghes NVDA2012:00: severity: 3
nvidia-ghes NVDA2012:00: socket: 0
nvidia-ghes NVDA2012:00: number_regs: 32
nvidia-ghes NVDA2012:00: instance_base: 0x0000000000000000
nvidia-ghes NVDA2012:00: register[0]: address=0x8000000100000000 value=0x0000000100000000

[0] https://github.com/openbmc/libcper/commit/683e055061ce
Cc: Shiju Jose <shiju.jose@huawei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>
---
v3:
  - NVIDIA_GHES to GHES_NVIDIA.
  - Better error handling in probe()
  - "int i" in for loop.
v2:
  - Use right headers.
  - Use embedded struct and __counted_by.
  - Drop __packed.
  - Remove unecessary casts. 
  - Use * in sizeof().
  - Use devm_kmalloc() and struct assignment.
  - Use dev_err_probe and new devm helper.

 MAINTAINERS                     |   6 ++
 drivers/acpi/apei/Kconfig       |  14 +++
 drivers/acpi/apei/Makefile      |   1 +
 drivers/acpi/apei/ghes-nvidia.c | 149 ++++++++++++++++++++++++++++++++
 4 files changed, 170 insertions(+)
 create mode 100644 drivers/acpi/apei/ghes-nvidia.c

diff --git a/MAINTAINERS b/MAINTAINERS
index c3fe46d7c4bc..94608f8e247e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18919,6 +18919,12 @@ S:	Maintained
 F:	drivers/video/fbdev/nvidia/
 F:	drivers/video/fbdev/riva/
 
+NVIDIA GHES VENDOR CPER RECORD HANDLER
+M:	Kai-Heng Feng <kaihengf@nvidia.com>
+L:	linux-acpi@vger.kernel.org
+S:	Maintained
+F:	drivers/acpi/apei/nvidia-ghes.c
+
 NVIDIA VRS RTC DRIVER
 M:	Shubhi Garg <shgarg@nvidia.com>
 L:	linux-tegra@vger.kernel.org
diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index 070c07d68dfb..428458c623f0 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -74,6 +74,20 @@ config ACPI_APEI_EINJ_CXL
 
 	  If unsure say 'n'
 
+config ACPI_APEI_GHES_NVIDIA
+	tristate "NVIDIA GHES vendor record handler"
+	depends on ACPI_APEI_GHES
+	help
+	  Support for decoding NVIDIA-specific CPER sections delivered via
+	  the APEI GHES vendor record notifier chain. Registers a handler
+	  for the NVIDIA section GUID and logs error signatures, severity,
+	  socket, and diagnostic register address-value pairs.
+
+	  Enable on NVIDIA server platforms (e.g. DGX, HGX) that expose
+	  ACPI device NVDA2012 in their firmware tables.
+
+	  If unsure, say N.
+
 config ACPI_APEI_ERST_DEBUG
 	tristate "APEI Error Record Serialization Table (ERST) Debug Support"
 	depends on ACPI_APEI
diff --git a/drivers/acpi/apei/Makefile b/drivers/acpi/apei/Makefile
index 1a0b85923cd4..66588d6be56f 100644
--- a/drivers/acpi/apei/Makefile
+++ b/drivers/acpi/apei/Makefile
@@ -10,5 +10,6 @@ obj-$(CONFIG_ACPI_APEI_EINJ)	+= einj.o
 einj-y				:= einj-core.o
 einj-$(CONFIG_ACPI_APEI_EINJ_CXL) += einj-cxl.o
 obj-$(CONFIG_ACPI_APEI_ERST_DEBUG) += erst-dbg.o
+obj-$(CONFIG_ACPI_APEI_GHES_NVIDIA) += ghes-nvidia.o
 
 apei-y := apei-base.o hest.o erst.o bert.o
diff --git a/drivers/acpi/apei/ghes-nvidia.c b/drivers/acpi/apei/ghes-nvidia.c
new file mode 100644
index 000000000000..597275d81de8
--- /dev/null
+++ b/drivers/acpi/apei/ghes-nvidia.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NVIDIA GHES vendor record handler
+ *
+ * Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+#include <acpi/ghes.h>
+
+static const guid_t nvidia_sec_guid =
+	GUID_INIT(0x6d5244f2, 0x2712, 0x11ec,
+		  0xbe, 0xa7, 0xcb, 0x3f, 0xdb, 0x95, 0xc7, 0x86);
+
+struct cper_sec_nvidia {
+	char	signature[16];
+	__le16	error_type;
+	__le16	error_instance;
+	u8	severity;
+	u8	socket;
+	u8	number_regs;
+	u8	reserved;
+	__le64	instance_base;
+	struct {
+		__le64	addr;
+		__le64	val;
+	} regs[] __counted_by(number_regs);
+};
+
+struct nvidia_ghes_private {
+	struct notifier_block	nb;
+	struct device		*dev;
+};
+
+static void nvidia_ghes_print_error(struct device *dev,
+				    const struct cper_sec_nvidia *nvidia_err,
+				    size_t error_data_length, bool fatal)
+{
+	const char *level = fatal ? KERN_ERR : KERN_INFO;
+	size_t min_size;
+
+	dev_printk(level, dev, "signature: %.16s\n", nvidia_err->signature);
+	dev_printk(level, dev, "error_type: %u\n", le16_to_cpu(nvidia_err->error_type));
+	dev_printk(level, dev, "error_instance: %u\n", le16_to_cpu(nvidia_err->error_instance));
+	dev_printk(level, dev, "severity: %u\n", nvidia_err->severity);
+	dev_printk(level, dev, "socket: %u\n", nvidia_err->socket);
+	dev_printk(level, dev, "number_regs: %u\n", nvidia_err->number_regs);
+	dev_printk(level, dev, "instance_base: 0x%016llx\n",
+		   le64_to_cpu(nvidia_err->instance_base));
+
+	if (nvidia_err->number_regs == 0)
+		return;
+
+	/*
+	 * Validate that all registers fit within error_data_length.
+	 * Each register pair is two little-endian u64s.
+	 */
+	min_size = struct_size(nvidia_err, regs, nvidia_err->number_regs);
+	if (error_data_length < min_size) {
+		dev_err(dev, "Invalid number_regs %u (section size %zu, need %zu)\n",
+			nvidia_err->number_regs, error_data_length, min_size);
+		return;
+	}
+
+	for (int i = 0; i < nvidia_err->number_regs; i++)
+		dev_printk(level, dev, "register[%d]: address=0x%016llx value=0x%016llx\n",
+			   i, le64_to_cpu(nvidia_err->regs[i].addr),
+			   le64_to_cpu(nvidia_err->regs[i].val));
+}
+
+static int nvidia_ghes_notify(struct notifier_block *nb,
+			      unsigned long event, void *data)
+{
+	struct acpi_hest_generic_data *gdata = data;
+	struct nvidia_ghes_private *priv;
+	const struct cper_sec_nvidia *nvidia_err;
+	guid_t sec_guid;
+
+	import_guid(&sec_guid, gdata->section_type);
+	if (!guid_equal(&sec_guid, &nvidia_sec_guid))
+		return NOTIFY_DONE;
+
+	priv = container_of(nb, struct nvidia_ghes_private, nb);
+
+	if (acpi_hest_get_error_length(gdata) < sizeof(*nvidia_err)) {
+		dev_err(priv->dev, "Section too small (%d < %zu)\n",
+			acpi_hest_get_error_length(gdata), sizeof(*nvidia_err));
+		return NOTIFY_OK;
+	}
+
+	nvidia_err = acpi_hest_get_payload(gdata);
+
+	if (event >= GHES_SEV_RECOVERABLE)
+		dev_err(priv->dev, "NVIDIA CPER section, error_data_length: %u\n",
+			acpi_hest_get_error_length(gdata));
+	else
+		dev_info(priv->dev, "NVIDIA CPER section, error_data_length: %u\n",
+			 acpi_hest_get_error_length(gdata));
+
+	nvidia_ghes_print_error(priv->dev, nvidia_err, acpi_hest_get_error_length(gdata),
+				event >= GHES_SEV_RECOVERABLE);
+
+	return NOTIFY_OK;
+}
+
+static int nvidia_ghes_probe(struct platform_device *pdev)
+{
+	struct nvidia_ghes_private *priv;
+	int ret;
+
+	priv = devm_kmalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	*priv = (struct nvidia_ghes_private) {
+		.nb.notifier_call = nvidia_ghes_notify,
+		.dev = &pdev->dev,
+	};
+
+	ret = devm_ghes_register_vendor_record_notifier(&pdev->dev, &priv->nb);
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to register NVIDIA GHES vendor record notifier\n");
+
+	return 0;
+}
+
+static const struct acpi_device_id nvidia_ghes_acpi_match[] = {
+	{ "NVDA2012" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, nvidia_ghes_acpi_match);
+
+static struct platform_driver nvidia_ghes_driver = {
+	.driver = {
+		.name = "nvidia-ghes",
+		.acpi_match_table = nvidia_ghes_acpi_match,
+	},
+	.probe = nvidia_ghes_probe,
+};
+module_platform_driver(nvidia_ghes_driver);
+
+MODULE_AUTHOR("Kai-Heng Feng <kaihengf@nvidia.com>");
+MODULE_DESCRIPTION("NVIDIA GHES vendor CPER record handler");
+MODULE_LICENSE("GPL");
-- 
2.50.1 (Apple Git-155)

Re: [PATCH v3 0/3] ACPI: APEI: GHES: Add device-managed notifier helper and NVIDIA CPER handler

[Rafael J. Wysocki]

On Mon, Mar 30, 2026 at 11:42 AM Kai-Heng Feng <kaihengf@nvidia.com> wrote:
>
> NVIDIA DGX and HGX platforms provide an ACPI device (NVDA2012) alongside
> the GHES error source. The device does not generate the error records
> itself; its purpose is to allow the vendor CPER handler driver to load
> automatically via ACPI enumeration rather than manual module loading.
>
> The series introduces devm_ghes_register_vendor_record_notifier() helper,
> let HiSilicon PCI driver and new NVIDA GHES driver use the new helper.
>
> Kai-Heng Feng (3):
>   ACPI: APEI: GHES: Add devm_ghes_register_vendor_record_notifier()
>   PCI: hisi: Use devm_ghes_register_vendor_record_notifier()
>   ACPI: APEI: GHES: Add NVIDIA vendor CPER record handler
>
>  MAINTAINERS                              |   6 +
>  drivers/acpi/apei/Kconfig                |  14 +++
>  drivers/acpi/apei/Makefile               |   1 +
>  drivers/acpi/apei/ghes-nvidia.c          | 149 +++++++++++++++++++++++
>  drivers/acpi/apei/ghes.c                 |  18 +++
>  drivers/pci/controller/pcie-hisi-error.c |  12 +-
>  include/acpi/ghes.h                      |  11 ++
>  7 files changed, 200 insertions(+), 11 deletions(-)
>  create mode 100644 drivers/acpi/apei/ghes-nvidia.c
>
> --

Whole series applied as 7.1 material, thanks!