+static ssize_t ntb_debugfs_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *offp)
+{
+ struct ntb_device *ndev;
+ char *buf;
+ ssize_t ret, offset, out_count;
+
+ out_count = 500;
+
+ buf = kmalloc(out_count, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ndev = filp->private_data;
+ offset = 0;
+ offset += snprintf(buf + offset, out_count - offset,
+ "NTB Device Information:\n");
+ offset += snprintf(buf + offset, out_count - offset,
+ "Connection Type - \t\t%s\n",
+ ndev->conn_type == NTB_CONN_TRANSPARENT ?
+ "Transparent" : (ndev->conn_type == NTB_CONN_B2B) ?
+ "Back to back" : "Root Port");
+ offset += snprintf(buf + offset, out_count - offset,
+ "Device Type - \t\t\t%s\n",
+ ndev->dev_type == NTB_DEV_USD ?
+ "DSD/USP" : "USD/DSP");
+ offset += snprintf(buf + offset, out_count - offset,
+ "Max Number of Callbacks - \t%u\n",
+ ntb_max_cbs(ndev));
+ offset += snprintf(buf + offset, out_count - offset,
+ "Link Status - \t\t\t%s\n",
+ ntb_hw_link_status(ndev) ? "Up" : "Down");
+ if (ntb_hw_link_status(ndev)) {
+ offset += snprintf(buf + offset, out_count - offset,
+ "Link Speed - \t\t\tPCI-E Gen %u\n",
+ ndev->link_speed);
+ offset += snprintf(buf + offset, out_count - offset,
+ "Link Width - \t\t\tx%u\n",
+ ndev->link_width);
+ }
+
+ if (ndev->hw_type != BWD_HW) {
+ u32 status32;
+ u16 status16;
+ int rc;
+
+ offset += snprintf(buf + offset, out_count - offset,
+ "\nNTB Device Statistics:\n");
+ offset += snprintf(buf + offset, out_count - offset,
+ "Upstream Memory Miss - \t%u\n",
+ readw(ndev->reg_base +
+ SNB_USMEMMISS_OFFSET));
+
+ offset += snprintf(buf + offset, out_count - offset,
+ "\nNTB Hardware Errors:\n");
+
+ rc = pci_read_config_word(ndev->pdev, SNB_DEVSTS_OFFSET,
+ &status16);
+ if (!rc)
+ offset += snprintf(buf + offset, out_count - offset,
+ "DEVSTS - \t%#06x\n", status16);
+
+ rc = pci_read_config_word(ndev->pdev, SNB_LINK_STATUS_OFFSET,
+ &status16);
+ if (!rc)
+ offset += snprintf(buf + offset, out_count - offset,
+ "LNKSTS - \t%#06x\n", status16);
+
+ rc = pci_read_config_dword(ndev->pdev, SNB_UNCERRSTS_OFFSET,
+ &status32);
+ if (!rc)
+ offset += snprintf(buf + offset, out_count - offset,
+ "UNCERRSTS - \t%#010x\n", status32);
+
+ rc = pci_read_config_dword(ndev->pdev, SNB_CORERRSTS_OFFSET,
+ &status32);
+ if (!rc)
+ offset += snprintf(buf + offset, out_count - offset,
+ "CORERRSTS - \t%#010x\n", status32);
+ }
+
+ if (offset > out_count)
+ offset = out_count;
+
+ ret = simple_read_from_buffer(ubuf, count, offp, buf, offset);
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations ntb_debugfs_info = {
+ .owner = THIS_MODULE,
+ .open = simple_open,
+ .read = ntb_debugfs_read,
+};
+