UEFI v2.10 section N.2.13 defines a CPER record for CXL Protocol errors.
Add GHES support to detect CXL CPER Protocol record and cache error
severity, device_id, serial number and a pointer to CXL RAS capability
struct in struct cxl_cper_rec_data.
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@xxxxxxx>
---
drivers/acpi/apei/ghes.c | 15 ++++++++++
drivers/firmware/efi/cper_cxl.c | 52 +++++++++++++++++++++++++++++++++
include/linux/cxl-event.h | 6 ++++
3 files changed, 73 insertions(+)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index d6a85fbc0a8b..6471584b2e79 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -714,6 +714,18 @@ static void cxl_cper_post_event(enum cxl_event_type event_type,
cper_callback(event_type, &data);
}
+void cxl_cper_handle_prot_err(struct acpi_hest_generic_data *gdata)
+{
+ struct cxl_cper_rec_data data;
+
+ memset(&data, 0, sizeof(data));
+
+ if (cxl_cper_handle_prot_err_info(gdata, &data))
+ return;
+
+ data.severity = gdata->error_severity;
+}
+
int cxl_cper_register_callback(cxl_cper_callback callback)
{
guard(rwsem_write)(&cxl_cper_rw_sem);
@@ -768,6 +780,9 @@ static bool ghes_do_proc(struct ghes *ghes,
else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
queued = ghes_handle_arm_hw_error(gdata, sev);
}
+ else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) {
+ cxl_cper_handle_prot_err(gdata);
+ }
else if (guid_equal(sec_type, &CPER_SEC_CXL_GEN_MEDIA_GUID)) {
struct cxl_cper_event_rec *rec = acpi_hest_get_payload(gdata);
diff --git a/drivers/firmware/efi/cper_cxl.c b/drivers/firmware/efi/cper_cxl.c
index 4fd8d783993e..3bc0b9f28c9e 100644
--- a/drivers/firmware/efi/cper_cxl.c
+++ b/drivers/firmware/efi/cper_cxl.c
@@ -8,6 +8,7 @@
*/
#include <linux/cper.h>
+#include <acpi/ghes.h>
#include "cper_cxl.h"
#define PROT_ERR_VALID_AGENT_TYPE BIT_ULL(0)
@@ -176,3 +177,54 @@ void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_e
sizeof(cxl_ras->header_log), 0);
}
}
+
+int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata,
+ struct cxl_cper_rec_data *data)
+{
+ struct cper_sec_prot_err *prot_err = acpi_hest_get_payload(gdata);
+ struct cper_cxl_event_devid *device_id = &data->rec.hdr.device_id;
+ struct cper_cxl_event_sn *dev_serial_num = &data->rec.hdr.dev_serial_num;
+ size_t size = sizeof(*prot_err) + prot_err->dvsec_len;
+
+ if (!(prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG)) {
+ pr_err(FW_WARN "Not a valid protocol error log\n");
+ return -EINVAL;
+ }
+
+ if (!(prot_err->valid_bits & PROT_ERR_VALID_DEVICE_ID)) {
+ pr_err(FW_WARN "Not a valid Device ID\n");
+ return -EINVAL;
+ }
+
+ /*
+ * The device ID or agent address is only valid for CXL 1.1 device,
+ * CXL 2.0 device, CXL 2.0 Logical device, CXL 2.0 Fabric Manager
+ * Managed Logical Device, CXL Root Port, CXL Downstream Switch
+ * Port, or CXL Upstream Switch Port.
+ */
+ if (prot_err->agent_type <= 0x7 && prot_err->agent_type != RCH_DP) {
+ device_id->segment_num = prot_err->agent_addr.segment;
+ device_id->bus_num = prot_err->agent_addr.bus;
+ device_id->device_num = prot_err->agent_addr.device;
+ device_id->func_num = prot_err->agent_addr.function;
+ } else {
+ pr_err(FW_WARN "Not a valid agent type\n");
+ return -EINVAL;
+ }
+
+ /*
+ * The device serial number is only valid for CXL 1.1 device, CXL
+ * 2.0 device, CXL 2.0 Logical device, or CXL 2.0 Fabric Manager
+ * Managed Logical Device.
+ */
+ if (!(prot_err->valid_bits & PROT_ERR_VALID_SERIAL_NUMBER) ||
+ prot_err->agent_type > 0x4 || prot_err->agent_type == RCH_DP)
+ pr_warn(FW_WARN "No valid serial number present\n");
+
+ dev_serial_num->lower_dw = prot_err->dev_serial_num.lower_dw;
+ dev_serial_num->upper_dw = prot_err->dev_serial_num.upper_dw;
+
+ data->cxl_ras = (struct cxl_ras_capability_regs *)((long)prot_err + size);
+
+ return 0;
+}
diff --git a/include/linux/cxl-event.h b/include/linux/cxl-event.h
index 90d8390a73cb..7ba2dfd6619e 100644
--- a/include/linux/cxl-event.h
+++ b/include/linux/cxl-event.h
@@ -154,11 +154,17 @@ struct cxl_ras_capability_regs {
struct cxl_cper_rec_data {
struct cxl_cper_event_rec rec;
+ struct cxl_ras_capability_regs *cxl_ras;
+ int severity;
};
typedef void (*cxl_cper_callback)(enum cxl_event_type type,
struct cxl_cper_rec_data *data);
+struct acpi_hest_generic_data;
+int cxl_cper_handle_prot_err_info(struct acpi_hest_generic_data *gdata,
+ struct cxl_cper_rec_data *data);
+
#ifdef CONFIG_ACPI_APEI_GHES
int cxl_cper_register_callback(cxl_cper_callback callback);
int cxl_cper_unregister_callback(cxl_cper_callback callback);
--
2.17.1
