ath10k: implement fw_checksums debugfs file

When debugging firmware problems it's useful to check checksums of each
component. Add a debugfs interface to retrieve crc32 checksums:

# cat /sys/kernel/debug/ieee80211/phy0/ath10k/fw_checksums
firmware-N.bin          cc3fb466
athwlan                 c0089f21
otp                     f3efeb4f
codeswap                00000000
board-N.bin             bebc7c08
board                   bebc7c08

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 4fc3d4f..39fe4f3 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -2161,6 +2161,59 @@ static const struct file_operations fops_btcoex = {
        .open = simple_open
 };
 
+static ssize_t ath10k_debug_fw_checksums_read(struct file *file,
+                                             char __user *user_buf,
+                                             size_t count, loff_t *ppos)
+{
+       struct ath10k *ar = file->private_data;
+       unsigned int len = 0, buf_len = 4096;
+       ssize_t ret_cnt;
+       char *buf;
+
+       buf = kzalloc(buf_len, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       mutex_lock(&ar->conf_mutex);
+
+       if (len > buf_len)
+               len = buf_len;
+
+       len += scnprintf(buf + len, buf_len - len,
+                        "firmware-N.bin\t\t%08x\n",
+                        crc32_le(0, ar->firmware->data, ar->firmware->size));
+       len += scnprintf(buf + len, buf_len - len,
+                        "athwlan\t\t\t%08x\n",
+                        crc32_le(0, ar->firmware_data, ar->firmware_len));
+       len += scnprintf(buf + len, buf_len - len,
+                        "otp\t\t\t%08x\n",
+                        crc32_le(0, ar->otp_data, ar->otp_len));
+       len += scnprintf(buf + len, buf_len - len,
+                        "codeswap\t\t%08x\n",
+                        crc32_le(0, ar->swap.firmware_codeswap_data,
+                                 ar->swap.firmware_codeswap_len));
+       len += scnprintf(buf + len, buf_len - len,
+                        "board-N.bin\t\t%08x\n",
+                        crc32_le(0, ar->board->data, ar->board->size));
+       len += scnprintf(buf + len, buf_len - len,
+                        "board\t\t\t%08x\n",
+                        crc32_le(0, ar->board_data, ar->board_len));
+
+       ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+
+       mutex_unlock(&ar->conf_mutex);
+
+       kfree(buf);
+       return ret_cnt;
+}
+
+static const struct file_operations fops_fw_checksums = {
+       .read = ath10k_debug_fw_checksums_read,
+       .open = simple_open,
+       .owner = THIS_MODULE,
+       .llseek = default_llseek,
+};
+
 int ath10k_debug_create(struct ath10k *ar)
 {
        ar->debug.fw_crash_data = vzalloc(sizeof(*ar->debug.fw_crash_data));
@@ -2274,6 +2327,9 @@ int ath10k_debug_register(struct ath10k *ar)
                debugfs_create_file("btcoex", S_IRUGO | S_IWUSR,
                                    ar->debug.debugfs_phy, ar, &fops_btcoex);
 
+       debugfs_create_file("fw_checksums", S_IRUSR,
+                           ar->debug.debugfs_phy, ar, &fops_fw_checksums);
+
        return 0;
 }