linux-kernel - [RFC PATCH v3 3/3] acpi: apei: Warn when GHES marks correctable errors as "fatal"

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Date:   Wed, 25 Apr 2018 15:39:51 -0500
From:   Alexandru Gagniuc <mr.nuke.me@...il.com>
To:     linux-acpi@...r.kernel.org, linux-edac@...r.kernel.org
Cc:     Alexandru Gagniuc <mr.nuke.me@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Schmauss <erik.schmauss@...el.com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Will Deacon <will.deacon@....com>,
        James Morse <james.morse@....com>,
        Shiju Jose <shiju.jose@...wei.com>,
        "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        linux-kernel@...r.kernel.org, devel@...ica.org
Subject: [RFC PATCH v3 3/3] acpi: apei: Warn when GHES marks correctable errors as "fatal"

There seems to be a culture amongst BIOS teams to want to crash the
OS when an error can't be handled in firmware. Marking GHES errors as
"fatal" is a very common way to do this.

However, a number of errors reported by GHES may be fatal in the sense
a device or link is lost, but are not fatal to the system. When there
is a disagreement with firmware about the handleability of an error,
print a warning message.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
---
 drivers/acpi/apei/ghes.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 8ccb9cc10fc8..34d0da692dd0 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -539,6 +539,12 @@ static void ghes_do_proc(struct ghes *ghes,
 					       sec_sev, err,
 					       gdata->error_data_length);
 		}
+
+	}
+
+	if ((sev >= GHES_SEV_PANIC) && (ghes_actual_severity(ghes) < sev)) {
+		pr_warn("FIRMWARE BUG: Firmware sent fatal error that we were able to correct");
+		pr_warn("BROKEN FIRMWARE: Complain to your hardware vendor");
 	}
 }
 
-- 
2.14.3