Quelle  fbnic_fw_log.c   Sprache: C

// 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;
}