Messages in this thread | | | Date | Thu, 10 Nov 2016 10:02:35 -0500 | From | agustinv@codeauro ... | Subject | Re: [PATCH V6 2/3] ACPI: Add support for ResourceSource/IRQ domain mapping |
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Hey Hanjun,
On 2016-11-09 21:36, Hanjun Guo wrote: > Hi Marc, Rafael, Lorenzo, > > Since we agreed to add a probe deferral if we failed to get irq > resources which mirroring the DT does (patch 1 in this patch set), > I think the last blocker to make things work both for Agustin and > me [1] is this patch, which makes the interrupt producer and consumer > work in ACPI, we have two different solution for one thing, we'd happy > to work together for one solution, could you give some suggestions > please? > > [1]: > https://mail-archive.com/linux-kernel@vger.kernel.org/msg1257419.html > > Agustin, I have some comments below. > > On 2016/10/29 4:48, Agustin Vega-Frias wrote: >> This allows irqchip drivers to associate an ACPI DSDT device to >> an IRQ domain and provides support for using the ResourceSource >> in Extended IRQ Resources to find the domain and map the IRQs >> specified on that domain. >> >> Signed-off-by: Agustin Vega-Frias <agustinv@codeaurora.org> >> --- >> drivers/acpi/Makefile | 1 + >> drivers/acpi/irqdomain.c | 119 >> +++++++++++++++++++++++++++++++++++++++++++++++ > > Could we just reuse the gsi.c and not introduce a new > file, probably we can change the gsi.c to irqdomain.c > or something similar, then reuse the code in gsi.c.
I was thinking just that after we chatted off-list. I might revisit and see what I come up with given that we already have a device argument and we could pass the IRQ source there.
Thanks
> > Thanks > Hanjun > >> drivers/acpi/resource.c | 21 +++++---- >> include/linux/acpi.h | 25 ++++++++++ >> 4 files changed, 157 insertions(+), 9 deletions(-) >> create mode 100644 drivers/acpi/irqdomain.c >> >> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile >> index 9ed0878..880401b 100644 >> --- a/drivers/acpi/Makefile >> +++ b/drivers/acpi/Makefile >> @@ -57,6 +57,7 @@ acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o >> acpi-y += acpi_lpat.o >> acpi-$(CONFIG_ACPI_GENERIC_GSI) += gsi.o >> acpi-$(CONFIG_ACPI_WATCHDOG) += acpi_watchdog.o >> +acpi-$(CONFIG_IRQ_DOMAIN) += irqdomain.o >> >> # These are (potentially) separate modules >> >> diff --git a/drivers/acpi/irqdomain.c b/drivers/acpi/irqdomain.c >> new file mode 100644 >> index 0000000..11d3658 >> --- /dev/null >> +++ b/drivers/acpi/irqdomain.c >> @@ -0,0 +1,119 @@ >> +/* >> + * ACPI ResourceSource/IRQ domain mapping support >> + * >> + * Copyright (c) 2016, The Linux Foundation. All rights reserved. >> + * >> + * This program is free software; you can redistribute it and/or >> modify >> + * it under the terms of the GNU General Public License version 2 and >> + * only version 2 as published by the Free Software Foundation. >> + * >> + * This program is distributed in the hope that it will be useful, >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> + * GNU General Public License for more details. >> + */ >> +#include <linux/acpi.h> >> +#include <linux/irq.h> >> +#include <linux/irqdomain.h> >> + >> +/** >> + * acpi_irq_domain_register_irq() - Register the mapping for an IRQ >> produced >> + * by the given acpi_resource_source >> to a >> + * Linux IRQ number >> + * @source: IRQ source >> + * @hwirq: Hardware IRQ number >> + * @trigger: trigger type of the IRQ number to be mapped >> + * @polarity: polarity of the IRQ to be mapped >> + * >> + * Returns: a valid linux IRQ number on success >> + * -ENODEV if the given acpi_resource_source cannot be found >> + * -EPROBE_DEFER if the IRQ domain has not been registered >> + * -EINVAL for all other errors >> + */ >> +int acpi_irq_domain_register_irq(const struct acpi_resource_source >> *source, >> + u32 hwirq, int trigger, int polarity) >> +{ >> + struct irq_fwspec fwspec; >> + struct acpi_device *device; >> + acpi_handle handle; >> + acpi_status status; >> + int ret; >> + >> + /* An empty acpi_resource_source means it is a GSI */ >> + if (!source->string_length) >> + return acpi_register_gsi(NULL, hwirq, trigger, polarity); >> + >> + status = acpi_get_handle(NULL, source->string_ptr, &handle); >> + if (ACPI_FAILURE(status)) >> + return -ENODEV; >> + >> + device = acpi_bus_get_acpi_device(handle); >> + if (!device) >> + return -ENODEV; >> + >> + if (irq_find_matching_fwnode(&device->fwnode, DOMAIN_BUS_ANY) == >> NULL) { >> + ret = -EPROBE_DEFER; >> + goto out_put_device; >> + } >> + >> + fwspec.fwnode = &device->fwnode; >> + fwspec.param[0] = hwirq; >> + fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity); >> + fwspec.param_count = 2; >> + >> + ret = irq_create_fwspec_mapping(&fwspec); >> + >> +out_put_device: >> + acpi_bus_put_acpi_device(device); >> + >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(acpi_irq_domain_register_irq); >> + >> +/** >> + * acpi_irq_domain_unregister_irq() - Delete the mapping for an IRQ >> produced >> + * by the given >> acpi_resource_source to a >> + * Linux IRQ number >> + * @source: IRQ source >> + * @hwirq: Hardware IRQ number >> + * >> + * Returns: 0 on success >> + * -ENODEV if the given acpi_resource_source cannot be found >> + * -EINVAL for all other errors >> + */ >> +int acpi_irq_domain_unregister_irq(const struct acpi_resource_source >> *source, >> + u32 hwirq) >> +{ >> + struct irq_domain *domain; >> + struct acpi_device *device; >> + acpi_handle handle; >> + acpi_status status; >> + int ret = 0; >> + >> + if (!source->string_length) { >> + acpi_unregister_gsi(hwirq); >> + return 0; >> + } >> + >> + status = acpi_get_handle(NULL, source->string_ptr, &handle); >> + if (ACPI_FAILURE(status)) >> + return -ENODEV; >> + >> + device = acpi_bus_get_acpi_device(handle); >> + if (!device) >> + return -ENODEV; >> + >> + domain = irq_find_matching_fwnode(&device->fwnode, DOMAIN_BUS_ANY); >> + if (!domain) { >> + ret = -EINVAL; >> + goto out_put_device; >> + } >> + >> + irq_dispose_mapping(irq_find_mapping(domain, hwirq)); >> + >> +out_put_device: >> + acpi_bus_put_acpi_device(device); >> + >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(acpi_irq_domain_unregister_irq); >> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c >> index 4beda15..ccb6f4f 100644 >> --- a/drivers/acpi/resource.c >> +++ b/drivers/acpi/resource.c >> @@ -381,14 +381,15 @@ static void acpi_dev_irqresource_disabled(struct >> resource *res, u32 gsi) >> res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | >> IORESOURCE_UNSET; >> } >> >> -static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, >> +static void acpi_dev_get_irqresource(struct resource *res, u32 hwirq, >> + const struct acpi_resource_source *source, >> u8 triggering, u8 polarity, u8 shareable, >> bool legacy) >> { >> int irq, p, t; >> >> - if (!valid_IRQ(gsi)) { >> - acpi_dev_irqresource_disabled(res, gsi); >> + if ((source->string_length == 0) && !valid_IRQ(hwirq)) { >> + acpi_dev_irqresource_disabled(res, hwirq); >> return; >> } >> >> @@ -402,25 +403,25 @@ static void acpi_dev_get_irqresource(struct >> resource *res, u32 gsi, >> * using extended IRQ descriptors we take the IRQ configuration >> * from _CRS directly. >> */ >> - if (legacy && !acpi_get_override_irq(gsi, &t, &p)) { >> + if (legacy && !acpi_get_override_irq(hwirq, &t, &p)) { >> u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; >> u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; >> >> if (triggering != trig || polarity != pol) { >> - pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi, >> - t ? "level" : "edge", p ? "low" : "high"); >> + pr_warn("ACPI: IRQ %d override to %s, %s\n", hwirq, >> + t ? "level" : "edge", p ? "low" : "high"); >> triggering = trig; >> polarity = pol; >> } >> } >> >> res->flags = acpi_dev_irq_flags(triggering, polarity, shareable); >> - irq = acpi_register_gsi(NULL, gsi, triggering, polarity); >> + irq = acpi_irq_domain_register_irq(source, hwirq, triggering, >> polarity); >> if (irq >= 0) { >> res->start = irq; >> res->end = irq; >> } else { >> - acpi_dev_irqresource_disabled(res, gsi); >> + acpi_dev_irqresource_disabled(res, hwirq); >> } >> } >> >> @@ -446,6 +447,7 @@ static void acpi_dev_get_irqresource(struct >> resource *res, u32 gsi, >> bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int >> index, >> struct resource *res) >> { >> + const struct acpi_resource_source dummy = { 0, 0, NULL }; >> struct acpi_resource_irq *irq; >> struct acpi_resource_extended_irq *ext_irq; >> >> @@ -460,7 +462,7 @@ bool acpi_dev_resource_interrupt(struct >> acpi_resource *ares, int index, >> acpi_dev_irqresource_disabled(res, 0); >> return false; >> } >> - acpi_dev_get_irqresource(res, irq->interrupts[index], >> + acpi_dev_get_irqresource(res, irq->interrupts[index], &dummy, >> irq->triggering, irq->polarity, >> irq->sharable, true); >> break; >> @@ -471,6 +473,7 @@ bool acpi_dev_resource_interrupt(struct >> acpi_resource *ares, int index, >> return false; >> } >> acpi_dev_get_irqresource(res, ext_irq->interrupts[index], >> + &ext_irq->resource_source, >> ext_irq->triggering, ext_irq->polarity, >> ext_irq->sharable, false); >> break; >> diff --git a/include/linux/acpi.h b/include/linux/acpi.h >> index 40213c4..ce30a12 100644 >> --- a/include/linux/acpi.h >> +++ b/include/linux/acpi.h >> @@ -321,6 +321,31 @@ void acpi_set_irq_model(enum acpi_irq_model_id >> model, >> */ >> void acpi_unregister_gsi (u32 gsi); >> >> +#ifdef CONFIG_IRQ_DOMAIN >> + >> +int acpi_irq_domain_register_irq(const struct acpi_resource_source >> *source, >> + u32 hwirq, int trigger, int polarity); >> +int acpi_irq_domain_unregister_irq(const struct acpi_resource_source >> *source, >> + u32 hwirq); >> + >> +#else >> + >> +static inline int acpi_irq_domain_register_irq( >> + const struct acpi_resource_source *source, u32 hwirq, int trigger, >> + int polarity) >> +{ >> + return acpi_register_gsi(NULL, hwirq, trigger, polarity); >> +} >> + >> +static inline int acpi_irq_domain_unregister_irq( >> + const struct acpi_resource_source *source, u32 hwirq) >> +{ >> + acpi_unregister_gsi(hwirq); >> + return 0; >> +} >> + >> +#endif /* CONFIG_IRQ_DOMAIN */ >> + >> struct pci_dev; >> >> int acpi_pci_irq_enable (struct pci_dev *dev); >>
-- Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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