Re: [PATCH v3 3/3] soc: qcom: rpmh-rsc: Output debug information from RSC

[Konrad Dybcio]

On 8/12/26 8:12 AM, Maulik Shah wrote:
> From: "Raju P.L.S.S.S.N" <rplsssn@xxxxxxxxxxxxxx>
> 
> When an RPMh transfer times out there is no visibility into which
> TCS was stuck, what commands it was carrying, or whether the
> completion IRQ was pending at the GIC. Add rpmh_rsc_debug() to
> capture this state at timeout:

[...]

Looking good overall, some minor comments

> +static void print_tcs_info(struct rsc_drv *drv, int tcs_id,
> +			   bool *aoss_irq_sts)
> +{
> +	const struct tcs_request *req = get_req_from_tcs(drv, tcs_id);
> +	unsigned long cmds_enabled;
> +	char rname[CMD_DB_ID_SIZE + 1];
> +	u32 addr, data, msgid, sts, irq_sts;
> +	bool in_use = test_bit(tcs_id, drv->tcs_in_use);
> +	int i;
> +
> +	sts = read_tcs_reg(drv, drv->regs[RSC_DRV_STATUS], tcs_id);
> +	cmds_enabled = read_tcs_reg(drv, drv->regs[RSC_DRV_CMD_ENABLE], tcs_id);
> +	if (!cmds_enabled)
> +		return;
> +
> +	if (!req)
> +		goto print_tcs_data;
> +
> +	data = read_tcs_reg(drv, drv->regs[RSC_DRV_CONTROL], tcs_id);
> +	irq_sts = readl_relaxed(drv->tcs_base + drv->regs[RSC_DRV_IRQ_STATUS]);
> +	pr_warn("Request: tcs-in-use:%s state=%d wait_for_compl=%u\n",

Let's use dev_foo() everywhere instead of pr_foo, you have a struct dev* in
drv->dev
> +		in_use ? "YES" : "NO",

Please use str_yes_no() here, or AI contributors will rush to "fix" it..

[...]

> +/**
> + * rpmh_rsc_debug() - Dump debug information on a transfer timeout.
> + * @drv:   The RSC controller.
> + * @compl: The completion object that timed out.
> + *
> + * Dumps TCS state for all in-use TCSes and reports which accelerators
> + * did not respond, to aid in diagnosing RPMH timeout failures.
> + */
> +void rpmh_rsc_debug(struct rsc_drv *drv, struct completion *compl)
> +{
> +	struct irq_data *rsc_irq_data = irq_get_irq_data(drv->irq);
> +	bool gic_irq_sts, aoss_irq_sts = false;
> +	int i, busy = 0;
> +
> +	pr_err("RSC:%s\n", drv->name);

Let's perhaps touch this up to sth like "Timeout on RSC %s\n"

Konrad