Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933474AbcLNWLM (ORCPT ); Wed, 14 Dec 2016 17:11:12 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:57238 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751711AbcLNWLJ (ORCPT ); Wed, 14 Dec 2016 17:11:09 -0500 DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org B35616160E Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=pass smtp.mailfrom=agustinv@codeaurora.org From: Agustin Vega-Frias To: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rjw@rjwysocki.net, lenb@kernel.org, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com Cc: lorenzo.pieralisi@arm.com, timur@codeaurora.org, cov@codeaurora.org, agross@codeaurora.org, harba@codeaurora.org, jcm@redhat.com, msalter@redhat.com, mlangsdo@redhat.com, ahs3@redhat.com, astone@redhat.com, graeme.gregory@linaro.org, guohanjun@huawei.com, charles.garcia-tobin@arm.com, Agustin Vega-Frias Subject: [PATCH V9 2/3] ACPI: Add support for ResourceSource/IRQ domain mapping Date: Wed, 14 Dec 2016 17:10:37 -0500 Message-Id: <1481753438-3905-3-git-send-email-agustinv@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1481753438-3905-1-git-send-email-agustinv@codeaurora.org> References: <1481753438-3905-1-git-send-email-agustinv@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8946 Lines: 273 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. Signed-off-by: Agustin Vega-Frias --- drivers/acpi/Makefile | 2 +- drivers/acpi/{gsi.c => irq.c} | 182 ++++++++++++++++++++++++++++++++++++++++++ drivers/base/platform.c | 9 ++- include/linux/acpi.h | 10 +++ 4 files changed, 201 insertions(+), 2 deletions(-) rename drivers/acpi/{gsi.c => irq.c} (32%) diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 9ed0878..a391bbc 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -55,7 +55,7 @@ acpi-$(CONFIG_DEBUG_FS) += debugfs.o acpi-$(CONFIG_ACPI_NUMA) += numa.o acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o acpi-y += acpi_lpat.o -acpi-$(CONFIG_ACPI_GENERIC_GSI) += gsi.o +acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o acpi-$(CONFIG_ACPI_WATCHDOG) += acpi_watchdog.o # These are (potentially) separate modules diff --git a/drivers/acpi/gsi.c b/drivers/acpi/irq.c similarity index 32% rename from drivers/acpi/gsi.c rename to drivers/acpi/irq.c index ee9e0f2..133d3f8 100644 --- a/drivers/acpi/gsi.c +++ b/drivers/acpi/irq.c @@ -85,6 +85,188 @@ void acpi_unregister_gsi(u32 gsi) EXPORT_SYMBOL_GPL(acpi_unregister_gsi); /** + * acpi_get_irq_source_fwhandle() - Retrieve the fwhandle of the given + * acpi_resource_source which is used + * as an IRQ domain id + * @source: acpi_resource_source to use for the lookup + * + * Returns: The appropriate IRQ fwhandle domain id + * NULL on failure + */ +static struct fwnode_handle * +acpi_get_irq_source_fwhandle(const struct acpi_resource_source *source) +{ + struct fwnode_handle *result; + struct acpi_device *device; + 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 (ACPI_FAILURE(status)) { + pr_warn("Could not find handle for %s\n", source->string_ptr); + return NULL; + } + + device = acpi_bus_get_acpi_device(handle); + if (!device) { + pr_warn("Could not get device for %s\n", source->string_ptr); + return NULL; + } + + result = &device->fwnode; + acpi_bus_put_acpi_device(device); + + return result; +} + +/** + * Context for the resource walk used to lookup IRQ resources. + */ +struct acpi_irq_parse_one_ctx { + int rc; + unsigned int index; + unsigned long *res_flags; + struct irq_fwspec *fwspec; +}; + +/** + * acpi_irq_parse_one_match - Handle a matching IRQ resource + */ +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) +{ + ctx->rc = 0; + *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; +} + +/** + * acpi_irq_parse_one_cb - Handle the given resource + * @ares: resource to handle + * @context: context for the walk, contains the lookup index and references + * to the flags and fwspec where the result is returned + * + * This is called by acpi_walk_resources passing each resource returned by + * the _CRS method. We only inspect IRQ resources. Since IRQ resources + * might contain multiple interrupts we check if the index is within this + * one's interrupt array, otherwise we subtract the current resource IRQ + * count from the lookup index to prepare for the next resource. + * Once a match is found we call acpi_irq_parse_one_match to populate + * the result and end the walk by returning AE_CTRL_TERMINATE. + * + * Return AE_OK if the walk should continue, AE_CTRL_TERMINATE if a matching + * IRQ resource was found. + */ +static acpi_status acpi_irq_parse_one_cb(struct acpi_resource *ares, + void *context) +{ + struct acpi_irq_parse_one_ctx *ctx = context; + struct acpi_resource_irq *irq; + struct acpi_resource_extended_irq *eirq; + struct fwnode_handle *fwnode; + + switch (ares->type) { + case ACPI_RESOURCE_TYPE_IRQ: + irq = &ares->data.irq; + if (ctx->index >= irq->interrupt_count) { + ctx->index -= irq->interrupt_count; + return AE_OK; + } + fwnode = acpi_gsi_domain_id; + acpi_irq_parse_one_match(fwnode, irq->interrupts[ctx->index], + irq->triggering, irq->polarity, + irq->sharable, ctx); + return AE_CTRL_TERMINATE; + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + eirq = &ares->data.extended_irq; + if (ctx->index >= eirq->interrupt_count) { + ctx->index -= eirq->interrupt_count; + return AE_OK; + } + fwnode = acpi_get_irq_source_fwhandle(&eirq->resource_source); + acpi_irq_parse_one_match(fwnode, eirq->interrupts[ctx->index], + eirq->triggering, eirq->polarity, + eirq->sharable, ctx); + return AE_CTRL_TERMINATE; + } + + return AE_OK; +} + +/** + * acpi_irq_parse_one - Resolve an interrupt for a device + * @handle: the device whose interrupt is to be resolved + * @index: index of the interrupt to resolve + * @fwspec: structure irq_fwspec filled by this function + * @flags: resource flags filled by this function + * + * This function resolves an interrupt for a device by walking its CRS resources + * to find the appropriate ACPI IRQ resource and populating the given structure + * which can be used to retrieve a Linux IRQ number. + * + * Returns the result stored in ctx.rc by the callback, or -EINVAL if the given + * index is out of range. + */ +static int acpi_irq_parse_one(acpi_handle handle, unsigned int index, + struct irq_fwspec *fwspec, unsigned long *flags) +{ + struct acpi_irq_parse_one_ctx ctx = { -EINVAL, index, flags, fwspec }; + acpi_status status; + + status = acpi_walk_resources(handle, METHOD_NAME__CRS, + acpi_irq_parse_one_cb, &ctx); + if (ACPI_FAILURE(status)) + return -EINVAL; + return ctx.rc; +} + +/** + * acpi_irq_get - Look for the ACPI IRQ resource with the given index and + * use it to initialize the given Linux IRQ resource. + * @handle ACPI device handle + * @index ACPI IRQ resource index to lookup + * @res Linux IRQ resource to initialize + * + * Return: 0 on success + * -EINVAL if an error occurs + * -EPROBE_DEFER if the IRQ lookup/conversion failed + */ +int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res) +{ + int rc; + struct irq_fwspec fwspec; + struct irq_domain *domain; + unsigned long flags; + + 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) + return -EINVAL; + + res->start = rc; + res->end = rc; + res->flags = flags; + + return 0; +} +EXPORT_SYMBOL_GPL(acpi_irq_get); + +/** * acpi_set_irq_model - Setup the GSI irqdomain information * @model: the value assigned to acpi_irq_model * @fwnode: the irq_domain identifier for mapping and looking up diff --git a/drivers/base/platform.c b/drivers/base/platform.c index c4af003..61423d2 100644 --- 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 && ACPI_COMPANION(&dev->dev)) { + int ret; + + ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r); + if (ret) + return ret; + } + /* * The resources may pass trigger flags to the irqs that need * to be set up. It so happens that the trigger flags for @@ -1450,4 +1458,3 @@ void __init early_platform_cleanup(void) memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head)); } } - diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 61a3d90..2284fc6 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1123,4 +1123,14 @@ static inline void acpi_table_upgrade(void) { } static inline int parse_spcr(bool earlycon) { return 0; } #endif +#ifdef CONFIG_ACPI_GENERIC_GSI +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) +{ + return -EINVAL; +} +#endif + #endif /*_LINUX_ACPI_H*/ -- 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.