static ssize_t ndev_debugfs_read()

in hw/amd/ntb_hw_amd.c [838:933]

• 76 lines of code
• 3 McCabe index (conditional complexity)

static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf,
				 size_t count, loff_t *offp)
{
	struct amd_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,
			 "LNK STA -\t\t%#06x\n", ndev->lnk_sta);

	if (!amd_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,
			 "MSIX Vector Count -\t%u\n", ndev->msix_vec_count);

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

	u.v32 = readl(ndev->self_mmio + AMD_DBMASK_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Mask -\t\t\t%#06x\n", u.v32);

	u.v32 = readl(mmio + AMD_DBSTAT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "Doorbell Bell -\t\t\t%#06x\n", u.v32);

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

	u.v64 = read64(mmio + AMD_BAR1XLAT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "XLAT1 -\t\t%#018llx\n", u.v64);

	u.v64 = read64(ndev->self_mmio + AMD_BAR23XLAT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "XLAT23 -\t\t%#018llx\n", u.v64);

	u.v64 = read64(ndev->self_mmio + AMD_BAR45XLAT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "XLAT45 -\t\t%#018llx\n", u.v64);

	u.v32 = readl(mmio + AMD_BAR1LMT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "LMT1 -\t\t\t%#06x\n", u.v32);

	u.v64 = read64(ndev->self_mmio + AMD_BAR23LMT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "LMT23 -\t\t\t%#018llx\n", u.v64);

	u.v64 = read64(ndev->self_mmio + AMD_BAR45LMT_OFFSET);
	off += scnprintf(buf + off, buf_size - off,
			 "LMT45 -\t\t\t%#018llx\n", u.v64);

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