ssize_t ndev_ntb4_debugfs_read()

in hw/intel/ntb_hw_gen4.c [204:320]

• 94 lines of code
• 6 McCabe index (conditional complexity)

ssize_t ndev_ntb4_debugfs_read(struct file *filp, char __user *ubuf,
				      size_t count, loff_t *offp)
{
	struct intel_ntb_dev *ndev;
	void __iomem *mmio;
	char *buf;
	size_t buf_size;
	ssize_t ret, off;
	union { u64 v64; u32 v32; u16 v16; } u;

	ndev = filp->private_data;
	mmio = ndev->self_mmio;

	buf_size = min(count, 0x800ul);

	buf = kmalloc(buf_size, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	off = 0;

	off += scnprintf(buf + off, buf_size - off,
			 "NTB Device Information:\n");

	off += scnprintf(buf + off, buf_size - off,
			 "Connection Topology -\t%s\n",
			 ntb_topo_string(ndev->ntb.topo));

	off += scnprintf(buf + off, buf_size - off,
			 "NTB CTL -\t\t%#06x\n", ndev->ntb_ctl);
	off += scnprintf(buf + off, buf_size - off,
			 "LNK STA (cached) -\t\t%#06x\n", ndev->lnk_sta);

	if (!ndev->reg->link_is_up(ndev))
		off += scnprintf(buf + off, buf_size - off,
				 "Link Status -\t\tDown\n");
	else {
		off += scnprintf(buf + off, buf_size - off,
				 "Link Status -\t\tUp\n");
		off += scnprintf(buf + off, buf_size - off,
				 "Link Speed -\t\tPCI-E Gen %u\n",
				 NTB_LNK_STA_SPEED(ndev->lnk_sta));
		off += scnprintf(buf + off, buf_size - off,
				 "Link Width -\t\tx%u\n",
				 NTB_LNK_STA_WIDTH(ndev->lnk_sta));
	}

	off += scnprintf(buf + off, buf_size - off,
			 "Memory Window Count -\t%u\n", ndev->mw_count);
	off += scnprintf(buf + off, buf_size - off,
			 "Scratchpad Count -\t%u\n", ndev->spad_count);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Count -\t%u\n", ndev->db_count);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Vector Count -\t%u\n", ndev->db_vec_count);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Vector Shift -\t%u\n", ndev->db_vec_shift);

	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Valid Mask -\t%#llx\n", ndev->db_valid_mask);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Link Mask -\t%#llx\n", ndev->db_link_mask);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Mask Cached -\t%#llx\n", ndev->db_mask);

	u.v64 = ndev_db_read(ndev, mmio + ndev->self_reg->db_mask);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Mask -\t\t%#llx\n", u.v64);

	off += scnprintf(buf + off, buf_size - off,
			 "\nNTB Incoming XLAT:\n");

	u.v64 = ioread64(mmio + GEN4_IM23XBASE_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "IM23XBASE -\t\t%#018llx\n", u.v64);

	u.v64 = ioread64(mmio + GEN4_IM45XBASE_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "IM45XBASE -\t\t%#018llx\n", u.v64);

	u.v64 = ioread64(mmio + GEN4_IM23XLMT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "IM23XLMT -\t\t\t%#018llx\n", u.v64);

	u.v64 = ioread64(mmio + GEN4_IM45XLMT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "IM45XLMT -\t\t\t%#018llx\n", u.v64);

	off += scnprintf(buf + off, buf_size - off,
			 "\nNTB Statistics:\n");

	off += scnprintf(buf + off, buf_size - off,
			 "\nNTB Hardware Errors:\n");

	if (!pci_read_config_word(ndev->ntb.pdev,
				  GEN4_DEVSTS_OFFSET, &u.v16))
		off += scnprintf(buf + off, buf_size - off,
				"DEVSTS -\t\t%#06x\n", u.v16);

	u.v16 = ioread16(mmio + GEN4_LINK_STATUS_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			"LNKSTS -\t\t%#06x\n", u.v16);

	if (!pci_read_config_dword(ndev->ntb.pdev,
				   GEN4_UNCERRSTS_OFFSET, &u.v32))
		off += scnprintf(buf + off, buf_size - off,
				 "UNCERRSTS -\t\t%#06x\n", u.v32);

	if (!pci_read_config_dword(ndev->ntb.pdev,
				   GEN4_CORERRSTS_OFFSET, &u.v32))
		off += scnprintf(buf + off, buf_size - off,
				 "CORERRSTS -\t\t%#06x\n", u.v32);

	ret = simple_read_from_buffer(ubuf, count, offp, buf, off);
	kfree(buf);
	return ret;
}