1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_fw_log.c b/drivers/net/ethernet/meta/fbnic/fbnic_fw_log.c
new file mode 100644
index 000000000000..c1663f042245
--- /dev/null
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_fw_log.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) Meta Platforms, Inc. and affiliates. */
+
+#include <linux/spinlock.h>
+#include <linux/vmalloc.h>
+
+#include "fbnic.h"
+#include "fbnic_fw.h"
+#include "fbnic_fw_log.h"
+
+void fbnic_fw_log_enable(struct fbnic_dev *fbd, bool send_hist)
+{
+	int err;
+
+	if (!fbnic_fw_log_ready(fbd))
+		return;
+
+	if (fbd->fw_cap.running.mgmt.version < MIN_FW_VER_CODE_HIST)
+		send_hist = false;
+
+	err = fbnic_fw_xmit_send_logs(fbd, true, send_hist);
+	if (err && err != -EOPNOTSUPP)
+		dev_warn(fbd->dev, "Unable to enable firmware logs: %d\n", err);
+}
+
+void fbnic_fw_log_disable(struct fbnic_dev *fbd)
+{
+	int err;
+
+	err = fbnic_fw_xmit_send_logs(fbd, false, false);
+	if (err && err != -EOPNOTSUPP)
+		dev_warn(fbd->dev, "Unable to disable firmware logs: %d\n",
+			 err);
+}
+
+int fbnic_fw_log_init(struct fbnic_dev *fbd)
+{
+	struct fbnic_fw_log *log = &fbd->fw_log;
+	void *data;
+
+	if (WARN_ON_ONCE(fbnic_fw_log_ready(fbd)))
+		return -EEXIST;
+
+	data = vmalloc(FBNIC_FW_LOG_SIZE);
+	if (!data)
+		return -ENOMEM;
+
+	spin_lock_init(&fbd->fw_log.lock);
+	INIT_LIST_HEAD(&log->entries);
+	log->size = FBNIC_FW_LOG_SIZE;
+	log->data_start = data;
+	log->data_end = data + FBNIC_FW_LOG_SIZE;
+
+	fbnic_fw_log_enable(fbd, true);
+
+	return 0;
+}
+
+void fbnic_fw_log_free(struct fbnic_dev *fbd)
+{
+	struct fbnic_fw_log *log = &fbd->fw_log;
+
+	if (!fbnic_fw_log_ready(fbd))
+		return;
+
+	fbnic_fw_log_disable(fbd);
+	INIT_LIST_HEAD(&log->entries);
+	log->size = 0;
+	vfree(log->data_start);
+	log->data_start = NULL;
+	log->data_end = NULL;
+}
+
+int fbnic_fw_log_write(struct fbnic_dev *fbd, u64 index, u32 timestamp,
+		       char *msg)
+{
+	struct fbnic_fw_log_entry *entry, *head, *tail, *next;
+	struct fbnic_fw_log *log = &fbd->fw_log;
+	size_t msg_len = strlen(msg) + 1;
+	unsigned long flags;
+	void *entry_end;
+
+	if (!fbnic_fw_log_ready(fbd)) {
+		dev_err(fbd->dev, "Firmware sent log entry without being requested!\n");
+		return -ENOSPC;
+	}
+
+	spin_lock_irqsave(&log->lock, flags);
+
+	if (list_empty(&log->entries)) {
+		entry = log->data_start;
+	} else {
+		head = list_first_entry(&log->entries, typeof(*head), list);
+		entry_end = head->msg + head->len + 1;
+		entry = PTR_ALIGN(entry_end, 8);
+	}
+
+	entry_end = entry->msg + msg_len + 1;
+
+	/* We've reached the end of the buffer, wrap around */
+	if (entry_end > log->data_end) {
+		entry = log->data_start;
+		entry_end = entry->msg + msg_len + 1;
+	}
+
+	/* Make room for entry by removing from tail. */
+	list_for_each_entry_safe_reverse(tail, next, &log->entries, list) {
+		if (entry <= tail && entry_end > (void *)tail)
+			list_del(&tail->list);
+		else
+			break;
+	}
+
+	entry->index = index;
+	entry->timestamp = timestamp;
+	entry->len = msg_len;
+	strscpy(entry->msg, msg, entry->len);
+	list_add(&entry->list, &log->entries);
+
+	spin_unlock_irqrestore(&log->lock, flags);
+
+	return 0;
+}