On Fri, Jul 11, 2014 at 09:00:24AM +0200, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Provide a debugfs file that shows the current link status for each root
> port.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
I applied this with Stephen's ack to my pci/host-tegra branch for v3.17.
Let me know if you prefer a different merge strategy. I'll be on vacation
until Aug 11, so it won't be in my first pull request, but I plan to do
another for things like this.
> ---
> drivers/pci/host/pci-tegra.c | 118 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 118 insertions(+)
>
> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
> index 14ec5b2c69e0..49b3bd5f5926 100644
> --- a/drivers/pci/host/pci-tegra.c
> +++ b/drivers/pci/host/pci-tegra.c
> @@ -25,6 +25,7 @@
> */
>
> #include <linux/clk.h>
> +#include <linux/debugfs.h>
> #include <linux/delay.h>
> #include <linux/export.h>
> #include <linux/interrupt.h>
> @@ -275,6 +276,7 @@ struct tegra_pcie {
> unsigned int num_supplies;
>
> const struct tegra_pcie_soc_data *soc_data;
> + struct dentry *debugfs;
> };
>
> struct tegra_pcie_port {
> @@ -1664,6 +1666,115 @@ static const struct of_device_id tegra_pcie_of_match[] = {
> };
> MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
>
> +static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
> +{
> + struct tegra_pcie *pcie = s->private;
> +
> + if (list_empty(&pcie->ports))
> + return NULL;
> +
> + seq_printf(s, "Index Status\n");
> +
> + return seq_list_start(&pcie->ports, *pos);
> +}
> +
> +static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
> +{
> + struct tegra_pcie *pcie = s->private;
> +
> + return seq_list_next(v, &pcie->ports, pos);
> +}
> +
> +static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
> +{
> +}
> +
> +static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
> +{
> + bool up = false, active = false;
> + struct tegra_pcie_port *port;
> + unsigned int value;
> +
> + port = list_entry(v, struct tegra_pcie_port, list);
> +
> + value = readl(port->base + RP_VEND_XP);
> +
> + if (value & RP_VEND_XP_DL_UP)
> + up = true;
> +
> + value = readl(port->base + RP_LINK_CONTROL_STATUS);
> +
> + if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
> + active = true;
> +
> + seq_printf(s, "%2u ", port->index);
> +
> + if (up)
> + seq_printf(s, "up");
> +
> + if (active) {
> + if (up)
> + seq_printf(s, ", ");
> +
> + seq_printf(s, "active");
> + }
> +
> + seq_printf(s, "\n");
> + return 0;
> +}
> +
> +static const struct seq_operations tegra_pcie_ports_seq_ops = {
> + .start = tegra_pcie_ports_seq_start,
> + .next = tegra_pcie_ports_seq_next,
> + .stop = tegra_pcie_ports_seq_stop,
> + .show = tegra_pcie_ports_seq_show,
> +};
> +
> +static int tegra_pcie_ports_open(struct inode *inode, struct file *file)
> +{
> + struct tegra_pcie *pcie = inode->i_private;
> + struct seq_file *s;
> + int err;
> +
> + err = seq_open(file, &tegra_pcie_ports_seq_ops);
> + if (err)
> + return err;
> +
> + s = file->private_data;
> + s->private = pcie;
> +
> + return 0;
> +}
> +
> +static const struct file_operations tegra_pcie_ports_ops = {
> + .owner = THIS_MODULE,
> + .open = tegra_pcie_ports_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = seq_release,
> +};
> +
> +static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
> +{
> + struct dentry *file;
> +
> + pcie->debugfs = debugfs_create_dir("pcie", NULL);
> + if (!pcie->debugfs)
> + return -ENOMEM;
> +
> + file = debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs,
> + pcie, &tegra_pcie_ports_ops);
> + if (!file)
> + goto remove;
> +
> + return 0;
> +
> +remove:
> + debugfs_remove_recursive(pcie->debugfs);
> + pcie->debugfs = NULL;
> + return -ENOMEM;
> +}
> +
> static int tegra_pcie_probe(struct platform_device *pdev)
> {
> const struct of_device_id *match;
> @@ -1718,6 +1829,13 @@ static int tegra_pcie_probe(struct platform_device *pdev)
> goto disable_msi;
> }
>
> + if (IS_ENABLED(CONFIG_DEBUG_FS)) {
> + err = tegra_pcie_debugfs_init(pcie);
> + if (err < 0)
> + dev_err(&pdev->dev, "failed to setup debugfs: %d\n",
> + err);
> + }
> +
> platform_set_drvdata(pdev, pcie);
> return 0;
>
> --
> 2.0.1
>
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