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SubjectRe: [PATCH v2 2/2] irqchip/ti-sci-inta: Add support for unmapped event handling
On 2020-09-30 08:45, Peter Ujfalusi wrote:
> The DMA (BCDMA/PKTDMA and their rings/flows) events are under the
> INTA's
> supervision as unmapped events in AM64.

What does "unmapped event" mean? An event that doesn't require a
mapping?
Or an internally generated event? Or a proxy event?

>
> In order to keep the current SW stack working, the INTA driver must
> replace
> the dev_id with it's own when a request comes for BCDMA or PKTDMA
> resources.

This seems to support my second option. Please clarify what you mean
exactly.

>
> Implement parsing of the optional "ti,unmapped-event-sources" phandle
> array
> to get the sci-dev-ids of the devices where the unmapped events
> originate.
>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
> drivers/irqchip/irq-ti-sci-inta.c | 72 +++++++++++++++++++++++++++++--
> 1 file changed, 68 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/irqchip/irq-ti-sci-inta.c
> b/drivers/irqchip/irq-ti-sci-inta.c
> index bc863ef7998d..00f5b34863c5 100644
> --- a/drivers/irqchip/irq-ti-sci-inta.c
> +++ b/drivers/irqchip/irq-ti-sci-inta.c
> @@ -85,6 +85,8 @@ struct ti_sci_inta_vint_desc {
> * @base: Base address of the memory mapped IO registers
> * @pdev: Pointer to platform device.
> * @ti_sci_id: TI-SCI device identifier
> + * @difu_cnt: Number of TI-SCI device identifiers for unmapped events
> + * @dev_ids_for_unmapped: Pointer to an array of TI-SCI device
> identifiers
> */
> struct ti_sci_inta_irq_domain {
> const struct ti_sci_handle *sci;
> @@ -96,11 +98,33 @@ struct ti_sci_inta_irq_domain {
> void __iomem *base;
> struct platform_device *pdev;
> u32 ti_sci_id;
> +
> + int difu_cnt;

I like silly acronyms as much as the next man, but please adopt
sensible names. unmapped_cnt, or something.

> + u32 *dev_ids_for_unmapped;

unmapped_dev_ids?

> };
>
> #define to_vint_desc(e, i) container_of(e, struct
> ti_sci_inta_vint_desc, \
> events[i])
>
> +static u16 ti_sci_inta_get_dev_id(struct ti_sci_inta_irq_domain *inta,
> + u32 hwirq)
> +{
> + u16 dev_id = HWIRQ_TO_DEVID(hwirq);
> + int i;
> +
> + if (inta->difu_cnt == 0)
> + return dev_id;
> +
> + for (i = 0; i < inta->difu_cnt; i++) {
> + if (dev_id == inta->dev_ids_for_unmapped[i]) {
> + dev_id = inta->ti_sci_id;

ti_sci_id is a u32, and you are implicitly casting it as u16.
One of the two is wrong.

> + break;
> + }
> + }
> +
> + return dev_id;
> +}
> +
> /**
> * ti_sci_inta_irq_handler() - Chained IRQ handler for the vint irqs
> * @desc: Pointer to irq_desc corresponding to the irq
> @@ -251,7 +275,7 @@ static struct ti_sci_inta_event_desc
> *ti_sci_inta_alloc_event(struct ti_sci_inta
> u16 dev_id, dev_index;
> int err;
>
> - dev_id = HWIRQ_TO_DEVID(hwirq);
> + dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
> dev_index = HWIRQ_TO_IRQID(hwirq);
>
> event_desc = &vint_desc->events[free_bit];
> @@ -352,14 +376,15 @@ static void ti_sci_inta_free_irq(struct
> ti_sci_inta_event_desc *event_desc,
> {
> struct ti_sci_inta_vint_desc *vint_desc;
> struct ti_sci_inta_irq_domain *inta;
> + u16 dev_id;
>
> vint_desc = to_vint_desc(event_desc, event_desc->vint_bit);
> inta = vint_desc->domain->host_data;
> + dev_id = ti_sci_inta_get_dev_id(inta, hwirq);
> /* free event irq */
> mutex_lock(&inta->vint_mutex);
> inta->sci->ops.rm_irq_ops.free_event_map(inta->sci,
> - HWIRQ_TO_DEVID(hwirq),
> - HWIRQ_TO_IRQID(hwirq),
> + dev_id, HWIRQ_TO_IRQID(hwirq),
> inta->ti_sci_id,
> vint_desc->vint_id,
> event_desc->global_event,
> @@ -562,7 +587,6 @@ static void
> ti_sci_inta_msi_set_desc(msi_alloc_info_t *arg,
> arg->desc = desc;
> arg->hwirq = TO_HWIRQ(pdev->id, desc->inta.dev_index);
> }
> -
> static struct msi_domain_ops ti_sci_inta_msi_ops = {
> .set_desc = ti_sci_inta_msi_set_desc,
> };
> @@ -574,6 +598,42 @@ static struct msi_domain_info
> ti_sci_inta_msi_domain_info = {
> .chip = &ti_sci_inta_msi_irq_chip,
> };
>
> +static int ti_sci_inta_get_unmapped_sources(struct
> ti_sci_inta_irq_domain *inta)
> +{
> + struct device *dev = &inta->pdev->dev;
> + struct device_node *node = dev_of_node(dev);
> + struct of_phandle_iterator it;
> + int count, err, ret, i;
> +
> + count = of_count_phandle_with_args(node, "ti,unmapped-event-sources",
> + NULL);
> + if (count <= 0)
> + return 0;
> +
> + inta->dev_ids_for_unmapped = devm_kcalloc(dev, count,
> + sizeof(*inta->dev_ids_for_unmapped),
> + GFP_KERNEL);
> + if (!inta->dev_ids_for_unmapped)
> + return -ENOMEM;
> +
> + i = 0;
> + of_for_each_phandle(&it, err, node, "ti,unmapped-event-sources",
> + NULL, 0) {
> + ret = of_property_read_u32(it.node, "ti,sci-dev-id",
> + &inta->dev_ids_for_unmapped[i++]);
> + if (ret) {
> + dev_err(dev, "ti,sci-dev-id read failure for %s\n",
> + of_node_full_name(it.node));

Use the printk format specifier instead of of_node_full_name.

> + of_node_put(it.node);
> + return ret;
> + }
> + }
> +
> + inta->difu_cnt = count;
> +
> + return 0;
> +}
> +
> static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev)
> {
> struct irq_domain *parent_domain, *domain, *msi_domain;
> @@ -629,6 +689,10 @@ static int ti_sci_inta_irq_domain_probe(struct
> platform_device *pdev)
> if (IS_ERR(inta->base))
> return PTR_ERR(inta->base);
>
> + ret = ti_sci_inta_get_unmapped_sources(inta);
> + if (ret)
> + return ret;
> +
> domain = irq_domain_add_linear(dev_of_node(dev),
> ti_sci_get_num_resources(inta->vint),
> &ti_sci_inta_irq_domain_ops, inta);

M.
--
Jazz is not dead. It just smells funny...

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