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Message-ID: <6e501bf0-e4d7-7ce3-2d61-536d0fa29627@ti.com>
Date: Mon, 19 Oct 2020 14:52:02 +0300
From: Peter Ujfalusi <peter.ujfalusi@...com>
To: Marc Zyngier <maz@...nel.org>
CC: <nm@...com>, <t-kristo@...com>, <ssantosh@...nel.org>,
<tglx@...utronix.de>, <jason@...edaemon.net>, <robh+dt@...nel.org>,
<lokeshvutla@...com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] irqchip/ti-sci-inta: Add support for unmapped
event handling
Marc,
On 30/09/2020 11.33, Marc Zyngier wrote:
> 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.
Looks like I forgot to reply on the other comments...
>
>>
>> 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@...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.
It is silly to my taste as well...
>
>> + u32 *dev_ids_for_unmapped;
>
> unmapped_dev_ids?
OK, I will came up with more reasobnable names.
>
>> };
>>
>> #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.
Documentation/devicetree/bindings/arm/keystone/ti,k3-sci-common.yaml
defines the ti,sci-dev-id as u32.
I will store them in u16 array in ti_sci_inta_get_unmapped_sources()
>
>> + 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.
OK.
>
>> + 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.
- Péter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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