linux-kernel - [RFC PATCH v2 6/8] ACPI: APEI: EINJ: Add debugfs files for EINJv2 support

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Date: Tue, 21 May 2024 14:10:34 -0700
From: Zaid Alali <zaidal@...amperecomputing.com>
To: rafael@...nel.org,
	lenb@...nel.org,
	james.morse@....com,
	tony.luck@...el.com,
	bp@...en8.de,
	robert.moore@...el.com,
	Jonathan.Cameron@...wei.com,
	Benjamin.Cheatham@....com,
	dan.j.williams@...el.com,
	arnd@...db.de,
	Avadhut.Naik@....com,
	u.kleine-koenig@...gutronix.de,
	john.allen@....com,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Subject: [RFC PATCH v2 6/8] ACPI: APEI: EINJ: Add debugfs files for EINJv2 support

Create a debugfs blob file to be used for reading the user
input for the component array. EINJv2 enables users to inject
errors to multiple components/devices at the same time using
component array.

Signed-off-by: Zaid Alali <zaidal@...amperecomputing.com>
---
 drivers/acpi/apei/einj-core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
index 2021bea02996..2e30ebed079b 100644
--- a/drivers/acpi/apei/einj-core.c
+++ b/drivers/acpi/apei/einj-core.c
@@ -33,6 +33,7 @@
 #define SLEEP_UNIT_MAX		5000			/* 5ms */
 /* Firmware should respond within 1 seconds */
 #define FIRMWARE_TIMEOUT	(1 * USEC_PER_SEC)
+#define COMP_ARR_SIZE		1024
 #define ACPI65_EINJV2_SUPP	BIT(30)
 #define ACPI5_VENDOR_BIT	BIT(31)
 #define MEM_ERROR_MASK		(ACPI_EINJ_MEMORY_CORRECTABLE | \
@@ -107,6 +108,9 @@ static struct debugfs_blob_wrapper vendor_blob;
 static struct debugfs_blob_wrapper vendor_errors;
 static char vendor_dev[64];
 
+static struct debugfs_blob_wrapper einjv2_component_arr;
+static u64 component_count;
+static void *user_input;
 static u32 available_error_type;
 static u32 available_error_type_v2;
 
@@ -859,6 +863,19 @@ static int __init einj_probe(struct platform_device *pdev)
 				   &error_param4);
 		debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
 				   einj_debug_dir, &notrigger);
+		if (available_error_type & ACPI65_EINJV2_SUPP) {
+			debugfs_create_x64("einjv2_component_count", S_IRUSR | S_IWUSR,
+					einj_debug_dir,	&component_count);
+			user_input = kzalloc(COMP_ARR_SIZE, GFP_KERNEL);
+			if (!user_input) {
+				rc = -ENOMEM;
+				goto err_release;
+			}
+			einjv2_component_arr.data = user_input;
+			einjv2_component_arr.size = COMP_ARR_SIZE;
+			debugfs_create_blob("einjv2_component_array", S_IRUSR | S_IWUSR,
+					einj_debug_dir, &einjv2_component_arr);
+		}
 	}
 
 	if (vendor_dev[0]) {
@@ -908,6 +925,7 @@ static void __exit einj_remove(struct platform_device *pdev)
 	apei_resources_fini(&einj_resources);
 	debugfs_remove_recursive(einj_debug_dir);
 	acpi_put_table((struct acpi_table_header *)einj_tab);
+	kfree(user_input);
 }
 
 static struct platform_device *einj_dev;
-- 
2.34.1