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Message-ID: <20170126134814.GA1194@red-moon>
Date: Thu, 26 Jan 2017 13:48:14 +0000
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>,
Agustin Vega-Frias <agustinv@...eaurora.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
Len Brown <lenb@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <marc.zyngier@....com>,
Timur Tabi <timur@...eaurora.org>,
Christopher Covington <cov@...eaurora.org>,
Andy Gross <agross@...eaurora.org>, harba@...eaurora.org,
Jon Masters <jcm@...hat.com>, msalter@...hat.com,
mlangsdo@...hat.com, Al Stone <ahs3@...hat.com>, astone@...hat.com,
Graeme Gregory <graeme.gregory@...aro.org>,
guohanjun@...wei.com,
Charles Garcia-Tobin <charles.garcia-tobin@....com>
Subject: Re: [PATCH V11 2/3] ACPI: Add support for ResourceSource/IRQ domain
mapping
On Thu, Jan 26, 2017 at 11:43:43AM +0100, Rafael J. Wysocki wrote:
> On Thursday, January 26, 2017 10:15:21 AM Lorenzo Pieralisi wrote:
> > On Thu, Jan 26, 2017 at 03:01:18AM +0200, Andy Shevchenko wrote:
> > > On Fri, Jan 20, 2017 at 4:34 AM, Agustin Vega-Frias
> > > <agustinv@...eaurora.org> wrote:
> > > > ACPI extended IRQ resources may contain a ResourceSource to specify
> > > > an alternate interrupt controller. Introduce acpi_irq_get and use it
> > > > to implement ResourceSource/IRQ domain mapping.
> > > >
> > > > The new API is similar to of_irq_get and allows re-initialization
> > > > of a platform resource from the ACPI extended IRQ resource, and
> > > > provides proper behavior for probe deferral when the domain is not
> > > > yet present when called.
> > >
> > > > +static struct fwnode_handle *
> > > > +acpi_get_irq_source_fwhandle(const struct acpi_resource_source *source)
> > > > +{
> > > > + struct fwnode_handle *result = NULL;
> > > > + struct acpi_device *device;
> > > > + struct acpi_hardware_id *hwid;
> > > > + struct acpi_device_id *devid;
> > > > + acpi_handle handle;
> > > > + acpi_status status;
> > > > +
> > > > + if (!source->string_length)
> > > > + return acpi_gsi_domain_id;
> > > > +
> > > > + status = acpi_get_handle(NULL, source->string_ptr, &handle);
> > > > + if (WARN_ON(ACPI_FAILURE(status)))
> > > > + return NULL;
> > > > +
> > > > + device = acpi_bus_get_acpi_device(handle);
> > > > + if (WARN_ON(!device))
> > > > + return NULL;
> > > > +
> > >
> > > > + list_for_each_entry(hwid, &device->pnp.ids, list) {
> > >
> > > > + for (devid = &__dsdt_irqchip_acpi_probe_table;
> > > > + devid < &__dsdt_irqchip_acpi_probe_table_end; devid++) {
> > > > + if (devid->id && !strcmp(devid->id, hwid->id)) {
> > > > + result = &device->fwnode;
> > > > + break;
> > > > + }
> > > > + }
> > >
> > > Looks like a candidate for linker table API. (I recommend to Cc Luis
> > > for this part)
> >
> > This linker table entry scheme is just an optimization and should
> > not gate the series.
> >
> > > > + }
> > >
> > > > +/**
> > > > + * acpi_irq_parse_one_match - Handle a matching IRQ resource.
> > > > + * @fwnode: matching fwnode
> > > > + * @hwirq: hardware IRQ number
> > > > + * @triggering: triggering attributes of hwirq
> > > > + * @polarity: polarity attributes of hwirq
> > > > + * @polarity: polarity attributes of hwirq
> > > > + * @shareable: shareable attributes of hwirq
> > > > + * @ctx: acpi_irq_parse_one_ctx updated by this function
> > > > + *
> > > > + * Description:
> > > > + * Handle a matching IRQ resource by populating the given ctx with
> > > > + * the information passed.
> > > > + */
> > > > +static inline void acpi_irq_parse_one_match(struct fwnode_handle *fwnode,
> > > > + u32 hwirq, u8 triggering,
> > > > + u8 polarity, u8 shareable,
> > > > + struct acpi_irq_parse_one_ctx *ctx)
> > > > +{
> > >
> > > > + if (!fwnode)
> > > > + return;
> > >
> > > > + ctx->rc = 0;
> > >
> > > Perhaps ctx->rc = fwnode ? 0 : -EINVAL; ?
> > >
> > > > + *ctx->res_flags = acpi_dev_irq_flags(triggering, polarity, shareable);
> > > > + ctx->fwspec->fwnode = fwnode;
> > > > + ctx->fwspec->param[0] = hwirq;
> > > > + ctx->fwspec->param[1] = acpi_dev_get_irq_type(triggering, polarity);
> > > > + ctx->fwspec->param_count = 2;
> > > > +}
> > >
> > > > +int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res)
> > > > +{
> > > > + struct irq_fwspec fwspec;
> > > > + struct irq_domain *domain;
> > > > + unsigned long flags;
> > > > + int rc;
> > > > +
> > > > + rc = acpi_irq_parse_one(handle, index, &fwspec, &flags);
> > > > + if (rc)
> > > > + return rc;
> > > > +
> > > > + domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY);
> > > > + if (!domain)
> > > > + return -EPROBE_DEFER;
> > > > +
> > > > + rc = irq_create_fwspec_mapping(&fwspec);
> > > > + if (rc <= 0)
> > >
> > > Is rc = 0 an error?
> >
> > Yes.
> >
> > > > + return -EINVAL;
> > > > +
> > > > + res->start = rc;
> > > > + res->end = rc;
> > > > + res->flags = flags;
> > > > +
> > > > + return 0;
> > > > +}
> > > > +EXPORT_SYMBOL_GPL(acpi_irq_get);
> > >
> > > > --- a/drivers/base/platform.c
> > > > +++ b/drivers/base/platform.c
> > > > @@ -102,6 +102,14 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
> > >
> > > > r = platform_get_resource(dev, IORESOURCE_IRQ, num);
> > > > + if (r && r->flags & IORESOURCE_DISABLED && has_acpi_companion(&dev->dev)) {
> > > > + int ret;
> > > > +
> > > > + ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
> > > > + if (ret)
> > > > + return ret;
> > > > + }
> > >
> > > > +#ifdef CONFIG_ACPI_GENERIC_GSI
> > >
> > > #if IS_ENABLED()
> > >
> > > > +int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res);
> > > > +#else
> > > > +static inline int acpi_irq_get(acpi_handle handle, unsigned int index,
> > > > + struct resource *res)
> > >
> > > Perhaps
> > >
> > > static inline
> > > int ...
> >
> > It is late -rc5 and notwithstanding cosmetics changes, can we make
> > progress with this patch series or not please ?
>
> Yes, we can.
>
> I've just returned from travels and have not had the time to look at things in
> detail yet.
>
> I sent a notice about my travel in advance specifically so people didn't expect
> me to respond while I was traveling, but obviously everybody simply ignored it
> and went ahead with their lives. And then I get messages like this which
> doesn't make me happy at all.
I had to ask given that there are other series that depend on it and
that this code will eventually have to go via a tree that is not ACPI,
so that will require some coordination and it is getting late in the
cycle, that's all my message was meant for, apologies.
> I will start processing things shortly, but there is a backlog I need to work
> through and this one may not be the first item in it.
Ok no problems then, thank you !
Lorenzo
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