linux-kernel - [PATCH 1/4] acpi/ghes, cxl: Create a common CXL struct to handle different CXL CPER records

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Message-ID: <20240102150933.161009-2-Smita.KoralahalliChannabasappa@amd.com>
Date: Tue, 2 Jan 2024 15:09:30 +0000
From: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
To: <linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>
CC: Ard Biesheuvel <ardb@...nel.org>, Alison Schofield
	<alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, "Ira
 Weiny" <ira.weiny@...el.com>, Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>, Yazen Ghannam
	<yazen.ghannam@....com>, Smita Koralahalli
	<Smita.KoralahalliChannabasappa@....com>
Subject: [PATCH 1/4] acpi/ghes, cxl: Create a common CXL struct to handle different CXL CPER records

Currently defined cxl_cper_callback interface between CXL subsystem and
GHES module is just confined to handling CXL Component errors only.

Extend this callback to process CXL Protocol errors as well. Achieve
by defining a new struct cxl_cper_rec_data to include cxl_cper_event_rec
and other fields of CXL protocol errors which will be defined in future
patches.

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
---
 drivers/acpi/apei/ghes.c  | 6 +++++-
 drivers/cxl/pci.c         | 8 ++++----
 include/linux/cxl-event.h | 6 +++++-
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index aed465d2fd68..d6a85fbc0a8b 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -693,6 +693,10 @@ static cxl_cper_callback cper_callback;
 static void cxl_cper_post_event(enum cxl_event_type event_type,
 				struct cxl_cper_event_rec *rec)
 {
+	struct cxl_cper_rec_data data;
+
+	data.rec = *(struct cxl_cper_event_rec *)rec;
+
 	if (rec->hdr.length <= sizeof(rec->hdr) ||
 	    rec->hdr.length > sizeof(*rec)) {
 		pr_err(FW_WARN "CXL CPER Invalid section length (%u)\n",
@@ -707,7 +711,7 @@ static void cxl_cper_post_event(enum cxl_event_type event_type,
 
 	guard(rwsem_read)(&cxl_cper_rw_sem);
 	if (cper_callback)
-		cper_callback(event_type, rec);
+		cper_callback(event_type, &data);
 }
 
 int cxl_cper_register_callback(cxl_cper_callback callback)
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index b14237f824cf..7edbd53357e5 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -972,9 +972,9 @@ static struct pci_driver cxl_pci_driver = {
 
 #define CXL_EVENT_HDR_FLAGS_REC_SEVERITY GENMASK(1, 0)
 static void cxl_cper_event_call(enum cxl_event_type ev_type,
-				struct cxl_cper_event_rec *rec)
+				struct cxl_cper_rec_data *data)
 {
-	struct cper_cxl_event_devid *device_id = &rec->hdr.device_id;
+	struct cper_cxl_event_devid *device_id = &data->rec.hdr.device_id;
 	struct pci_dev *pdev __free(pci_dev_put) = NULL;
 	enum cxl_event_log_type log_type;
 	struct cxl_dev_state *cxlds;
@@ -996,11 +996,11 @@ static void cxl_cper_event_call(enum cxl_event_type ev_type,
 		return;
 
 	/* Fabricate a log type */
-	hdr_flags = get_unaligned_le24(rec->event.generic.hdr.flags);
+	hdr_flags = get_unaligned_le24(data->rec.event.generic.hdr.flags);
 	log_type = FIELD_GET(CXL_EVENT_HDR_FLAGS_REC_SEVERITY, hdr_flags);
 
 	cxl_event_trace_record(cxlds->cxlmd, log_type, ev_type,
-			       &uuid_null, &rec->event);
+			       &uuid_null, &data->rec.event);
 }
 
 static int __init cxl_pci_driver_init(void)
diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h
index 17eadee819b6..afa71ee0437c 100644
--- a/include/linux/cxl-event.h
+++ b/include/linux/cxl-event.h
@@ -141,8 +141,12 @@ struct cxl_cper_event_rec {
 	union cxl_event event;
 } __packed;
 
+struct cxl_cper_rec_data {
+	struct cxl_cper_event_rec rec;
+};
+
 typedef void (*cxl_cper_callback)(enum cxl_event_type type,
-				  struct cxl_cper_event_rec *rec);
+				  struct cxl_cper_rec_data *data);
 
 #ifdef CONFIG_ACPI_APEI_GHES
 int cxl_cper_register_callback(cxl_cper_callback callback);
-- 
2.17.1