[PATCH 22/24] irqchip/gic-v5: Add GICv5 ITS support

[Thomas Gleixner]

On Tue, Apr 08 2025 at 12:50, Lorenzo Pieralisi wrote:
>  
> +void gicv5_irs_syncr(void)
> +{
> +	u32 syncr;
> +	u32 statusr;
> +	int ret;
> +	struct gicv5_irs_chip_data *irs_data;
> +
> +	irs_data = list_first_entry_or_null(&irs_nodes,
> +					    struct gicv5_irs_chip_data, entry);
> +	if (WARN_ON(!irs_data))
> +		return;
> +
> +	syncr = FIELD_PREP(GICV5_IRS_SYNCR_SYNC, 1);
> +	irs_writel(irs_data, syncr, GICV5_IRS_SYNCR);
> +
> +	ret = readl_relaxed_poll_timeout_atomic(
> +			irs_data->irs_base + GICV5_IRS_SYNC_STATUSR, statusr,
> +			FIELD_GET(GICV5_IRS_SYNC_STATUSR_IDLE, statusr), 1,
> +			USEC_PER_SEC);
> +
> +	if (ret == -ETIMEDOUT)
> +		pr_err_ratelimited("SYNCR timeout...\n");

This timeout poll thing looks very familiar by now. Third variant :)

> +static int gicv5_its_wait_for_invalidation(struct gicv5_its_chip_data *its)
> +{
> +	int ret;
> +	u32 statusr;
> +
> +	ret = readl_relaxed_poll_timeout_atomic(
> +			its->its_base + GICV5_ITS_STATUSR, statusr,
> +			FIELD_GET(GICV5_ITS_STATUSR_IDLE, statusr), 1,
> +			USEC_PER_SEC);
> +
> +	if (ret == -ETIMEDOUT)
> +		pr_err_ratelimited("STATUSR timeout...\n");
> +
> +	return ret;
> +}

And number four follows suit :)

> +
> +static void gicv5_its_syncr(struct gicv5_its_chip_data *its,
> +			    struct gicv5_its_dev *its_dev)
> +{
> +	int ret;
> +	u64 syncr;
> +	u32 statusr;
> +
> +	syncr = FIELD_PREP(GICV5_ITS_SYNCR_SYNC, 1) |
> +		FIELD_PREP(GICV5_ITS_SYNCR_DEVICEID, its_dev->device_id);
> +
> +	its_writeq(its, syncr, GICV5_ITS_SYNCR);
> +
> +	ret = readl_relaxed_poll_timeout_atomic(
> +			its->its_base + GICV5_ITS_SYNC_STATUSR, statusr,
> +			FIELD_GET(GICV5_ITS_SYNC_STATUSR_IDLE, statusr), 1,
> +			USEC_PER_SEC);
> +
> +	if (ret == -ETIMEDOUT)
> +		pr_err_ratelimited("SYNCR timeout...\n");
> +}

Along with #5 

Thanks,

        tglx