linux-kernel - Re: [PATCH v2 3/3] usb: dwc3: Log dwc3 instance name in traces

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Message-ID: <20260109011813.6uxqrqzcf54y75xo@synopsys.com>
Date: Fri, 9 Jan 2026 01:18:24 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Prashanth K <prashanth.k@....qualcomm.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] usb: dwc3: Log dwc3 instance name in traces

On Mon, Jan 05, 2026, Prashanth K wrote:
> When multiple DWC3 controllers are being used, trace events from
> different instances get mixed up making debugging difficult as
> there's no way to distinguish which instance generated the trace.
> 
> Append the base address of dwc3 controller to trace events, so that
> the source instance is clearly identifiable.
> 
> Example trace output,
> before ->  dwc3_event: event (00000101): Reset [U0]
> after  ->  dwc3_event: 0a600000: event (00000101): Reset [U0]
> 
> Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
> ---
>  drivers/usb/dwc3/core.c   |  6 ++-
>  drivers/usb/dwc3/core.h   |  2 +
>  drivers/usb/dwc3/ep0.c    |  2 +-
>  drivers/usb/dwc3/gadget.c |  2 +-
>  drivers/usb/dwc3/io.h     |  4 +-
>  drivers/usb/dwc3/trace.h  | 88 ++++++++++++++++++++++++---------------
>  6 files changed, 66 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 670a9d4bfff2..3aa85f5f1c47 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -158,7 +158,7 @@ void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode, bool ignore_susphy)
>  	dwc3_writel(dwc, DWC3_GCTL, reg);
>  
>  	dwc->current_dr_role = mode;
> -	trace_dwc3_set_prtcap(mode);
> +	trace_dwc3_set_prtcap(dwc, mode);
>  }
>  EXPORT_SYMBOL_GPL(dwc3_set_prtcap);
>  
> @@ -2193,6 +2193,10 @@ int dwc3_core_probe(const struct dwc3_probe_data *data)
>  	dwc_res = *res;
>  	dwc_res.start += DWC3_GLOBALS_REGS_START;
>  
> +	/* Store the physical base address for logging in trace */
> +	snprintf(dwc->base_addr, sizeof(dwc->base_addr), "%08llx",
> +		 (unsigned long long)res->start);
> +

Why string?

>  	if (dev->of_node) {
>  		struct device_node *parent = of_get_parent(dev->of_node);
>  
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 23188b910528..c16e47273ea0 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1178,6 +1178,7 @@ struct dwc3_glue_ops {
>   * @wakeup_pending_funcs: Indicates whether any interface has requested for
>   *			 function wakeup in bitmap format where bit position
>   *			 represents interface_id.
> + * @base_addr: The HW base address of DWC3 controller.
>   */
>  struct dwc3 {
>  	struct work_struct	drd_work;
> @@ -1412,6 +1413,7 @@ struct dwc3 {
>  	struct dentry		*debug_root;
>  	u32			gsbuscfg0_reqinfo;
>  	u32			wakeup_pending_funcs;
> +	char			base_addr[9];

Can this be u32?

BR,
Thinh