linux-kernel - [PATCH v2] platform/chrome: chromeos_pstore: Add ecc

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Message-ID: <20250610050458.4014083-1-naoyatezuka@chromium.org>
Date: Tue, 10 Jun 2025 14:04:58 +0900
From: Naoya Tezuka <naoyatezuka@...omium.org>
To: Benson Leung <bleung@...omium.org>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Tony Luck <tony.luck@...el.com>,
	"Guilherme G . Piccoli" <gpiccoli@...lia.com>
Cc: chrome-platform@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Naoya Tezuka <naoyatezuka@...omium.org>
Subject: [PATCH v2] platform/chrome: chromeos_pstore: Add ecc_size module parameter

On ChromiumOS devices, the ecc_size is set to 0 (check dmesg | grep ecc 
to see `ecc: 0`): this disables ECC for ramoops region, even when 
ramoops.ecc=1 is given to kernel command line parameter.

This patch introduces ecc_size module parameter to provide an method to 
turn on ECC for ramoops and set different values of ecc_size per devices.

Signed-off-by: Naoya Tezuka <naoyatezuka@...omium.org>
---
v2:
- Remove an unnecessary blank line

v1: https://lore.kernel.org/lkml/20250610025152.3844404-1-naoyatezuka@chromium.org/ 
---
 drivers/platform/chrome/chromeos_pstore.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c
index f37c0ef4af1f..28e26aa99cdf 100644
--- a/drivers/platform/chrome/chromeos_pstore.c
+++ b/drivers/platform/chrome/chromeos_pstore.c
@@ -9,6 +9,10 @@
 #include <linux/platform_device.h>
 #include <linux/pstore_ram.h>
 
+static int ecc_size;
+module_param(ecc_size, int, 0444);
+MODULE_PARM_DESC(ecc_size, "ECC parity data size in bytes. A positive value enables ECC for the ramoops region.");
+
 static const struct dmi_system_id chromeos_pstore_dmi_table[] __initconst = {
 	{
 		/*
@@ -117,6 +121,9 @@ static int __init chromeos_pstore_init(void)
 {
 	bool acpi_dev_found;
 
+	if (ecc_size > 0)
+		chromeos_ramoops_data.ecc_info.ecc_size = ecc_size;
+
 	/* First check ACPI for non-hardcoded values from firmware. */
 	acpi_dev_found = chromeos_check_acpi();
 
-- 
2.50.0.rc0.604.gd4ff7b7c86-goog