Re: [PATCH V3 1/2] soc: qcom: smp2p: Use devname for interrupt descriptions

[Sudeep Patil <quic_sudeepgo@quicinc.com>]

On 6/27/2024 4:18 PM, Sudeepgoud Patil wrote:
> From: Chris Lew <quic_clew@quicinc.com>
> 
> When using /proc/interrupts to collect statistics on smp2p interrupt
> counts, it is hard to distinguish the different instances of smp2p from
> each other. For example to debug a processor boot issue, the ready and
> handover interrupts are checked for sanity to ensure the firmware
> reached a specific initialization stage.
> 
> Remove "smp2p" string from the irq request so that the irq will default
> to the device name. Add an .irq_print_chip() callback to print the irq
> chip name as the device name. These two changes allow for a unique name
> to be used in /proc/interrupts as shown below.
> 
> / # cat /proc/interrupts | grep smp2p
>   18:  ...      ipcc 196610 Edge      smp2p-adsp
>   20:  ...      ipcc 131074 Edge      smp2p-modem
> 170:  ...  smp2p-modem   1 Edge      q6v5 ready
> 178:  ...  smp2p-adsp   1 Edge      q6v5 ready
> 
> Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Signed-off-by: Sudeepgoud Patil <quic_sudeepgo@quicinc.com>
> ---
>   drivers/soc/qcom/smp2p.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
> index a21241cbeec7..696c2a8387d0 100644
> --- a/drivers/soc/qcom/smp2p.c
> +++ b/drivers/soc/qcom/smp2p.c
> @@ -16,6 +16,7 @@
>   #include <linux/platform_device.h>
>   #include <linux/pm_wakeirq.h>
>   #include <linux/regmap.h>
> +#include <linux/seq_file.h>
>   #include <linux/soc/qcom/smem.h>
>   #include <linux/soc/qcom/smem_state.h>
>   #include <linux/spinlock.h>
> @@ -353,11 +354,19 @@ static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type)
>   	return 0;
>   }
>   
> +static void smp2p_irq_print_chip(struct irq_data *irqd, struct seq_file *p)
> +{
> +	struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd);
> +
> +	seq_printf(p, " %8s", dev_name(entry->smp2p->dev));
> +}
> +
>   static struct irq_chip smp2p_irq_chip = {
>   	.name           = "smp2p",
>   	.irq_mask       = smp2p_mask_irq,
>   	.irq_unmask     = smp2p_unmask_irq,
>   	.irq_set_type	= smp2p_set_irq_type,
> +	.irq_print_chip = smp2p_irq_print_chip,
>   };
>   
>   static int smp2p_irq_map(struct irq_domain *d,
> @@ -617,7 +626,7 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
>   	ret = devm_request_threaded_irq(&pdev->dev, irq,
>   					NULL, qcom_smp2p_intr,
>   					IRQF_ONESHOT,
> -					"smp2p", (void *)smp2p);
> +					NULL, (void *)smp2p);
>   	if (ret) {
>   		dev_err(&pdev->dev, "failed to request interrupt\n");
>   		goto unwind_interfaces;