From patchwork Tue Nov 17 13:42:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen Baozi X-Patchwork-Id: 1401542 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=phytium.com.cn Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Cb6bS2gPfz9sVM for ; Wed, 18 Nov 2020 00:43:32 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387497AbgKQNm7 (ORCPT ); Tue, 17 Nov 2020 08:42:59 -0500 Received: from lonlinode-sdnproxy-1.icoremail.net ([139.162.193.133]:23496 "HELO lonlinode-sdnproxy-1.icoremail.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1732891AbgKQNm6 (ORCPT ); Tue, 17 Nov 2020 08:42:58 -0500 X-Greylist: delayed 10544 seconds by postgrey-1.27 at vger.kernel.org; Tue, 17 Nov 2020 08:42:53 EST Received: from localhost (unknown [113.247.217.134]) by c1app6 (Coremail) with SMTP id BgINCgCHjp4807Nf9jrUAA--.49953S3; Tue, 17 Nov 2020 21:42:21 +0800 (CST) From: Chen Baozi To: Ard Biesheuvel , Hanjun Guo , Marc Zyngier , Bjorn Helgaas Cc: linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Lorenzo Pieralisi Subject: [RFC PATCH V2] acpi/irq: Add stacked IRQ domain support to PCI interrupt link Date: Tue, 17 Nov 2020 21:42:14 +0800 Message-Id: <20201117134214.970-1-chenbaozi@phytium.com.cn> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-CM-TRANSID: BgINCgCHjp4807Nf9jrUAA--.49953S3 X-Coremail-Antispam: 1UD129KBjvJXoWxuw13uFyxXrW7JF47Zw18Zrb_yoWfJw4fpF Wxta4UAr48Xr4UWrs8Aa1rAF9xXa4jkrWUKrW3C3sIqan0gryrtF17CFyUZ34Ykws5Gay2 vr1UZF48GFyDZF7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUk2b7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I 8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8Jw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc2xSY4AK67AK6ry8MxAIw28I cxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2 IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI 42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42 IY6xAIw20EY4v20xvaj40_WFyUJVCq3wCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E 87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUy8nYDUUUU X-CM-SenderInfo: hfkh0updr2xqxsk13x1xpou0fpof0/1tbiDAHfP17uHvTkkQAAsC Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Some PCIe designs require software to do extra acknowledgements for legacy INTx interrupts. If the driver is written only for device tree, things are simple. In that case, a new driver can be written under driver/pci/controller/ with a DT node of PCIe host written like: pcie { ... interrupt-map = <0 0 0 1 &pcie_intc 0>, <0 0 0 2 &pcie_intc 1>, <0 0 0 3 &pcie_intc 2>, <0 0 0 4 &pcie_intc 3>; pcie_intc: legacy-interrupt-controller { interrupt-controller; #interrupt-cells = <1>; interrupt-parent = <&gic>; interrupts = <0 226 4>; }; }; Similar designs can be found on Aardvark, MediaTek Gen2 and Socionext UniPhier PCIe controller at the moment. Essentially, those designs are supported by inserting an extra interrupt controller between PCIe host and GIC and parse the topology in a DT-based PCI controller driver. As we turn to ACPI, All the PCIe hosts are described the same ID of "PNP0A03" and share driver/acpi/pci_root.c. It comes to be a problem to make this kind of PCI INTx work under ACPI. Therefore, we introduce an stacked IRQ domain support to PCI interrupt link for ACPI. With this support, we can populate the ResourceSource to refer to a device object that describes an interrupt controller. That would allow us to refer to a dedicated driver which implements the logic needed to manage the interrupt state. With this patch, those PCI interrupt links can be supported by describing the INTx in ACPI table as the following example: Device (IXIU) { ... } Device(LINKA) { Name(_HID, EISAID("PNP0C0F")) Name(_PRS, ResourceTemplate(){ Interrupt(ResourceProducer, Level, ActiveHigh, Exclusive, 0, "\\SB.IXIU") { 60 } }) ... } Device(PCI0) { ... Name(_PRT, Package{ Package{ 0x0000FFFF, 0, LINKA, 0 } ... }) } Signed-off-by: Chen Baozi --- drivers/acpi/irq.c | 22 +++++++++++++++++++++- drivers/acpi/pci_irq.c | 6 ++++-- drivers/acpi/pci_link.c | 17 +++++++++++++++-- include/acpi/acpi_drivers.h | 2 +- include/linux/acpi.h | 4 ++++ 5 files changed, 45 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/irq.c b/drivers/acpi/irq.c index e209081d644b..e78a44815c44 100644 --- a/drivers/acpi/irq.c +++ b/drivers/acpi/irq.c @@ -81,6 +81,25 @@ void acpi_unregister_gsi(u32 gsi) } EXPORT_SYMBOL_GPL(acpi_unregister_gsi); +int acpi_register_irq(struct device *dev, u32 irq, int trigger, + int polarity, struct fwnode_handle *domain_id) +{ + struct irq_fwspec fwspec; + + if (WARN_ON(!domain_id)) { + pr_warn("GSI: No registered irqchip, giving up\n"); + return -EINVAL; + } + + fwspec.fwnode = domain_id; + fwspec.param[0] = irq; + fwspec.param[1] = acpi_dev_get_irq_type(trigger, polarity); + fwspec.param_count = 2; + + return irq_create_fwspec_mapping(&fwspec); +} +EXPORT_SYMBOL_GPL(acpi_register_irq); + /** * acpi_get_irq_source_fwhandle() - Retrieve fwhandle from IRQ resource source. * @source: acpi_resource_source to use for the lookup. @@ -92,7 +111,7 @@ EXPORT_SYMBOL_GPL(acpi_unregister_gsi); * Return: * The referenced device fwhandle or NULL on failure */ -static struct fwnode_handle * +struct fwnode_handle * acpi_get_irq_source_fwhandle(const struct acpi_resource_source *source) { struct fwnode_handle *result; @@ -115,6 +134,7 @@ acpi_get_irq_source_fwhandle(const struct acpi_resource_source *source) acpi_bus_put_acpi_device(device); return result; } +EXPORT_SYMBOL_GPL(acpi_get_irq_source_fwhandle); /* * Context for the resource walk used to lookup IRQ resources. diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index 14ee631cb7cf..19296d70c95c 100644 --- a/drivers/acpi/pci_irq.c +++ b/drivers/acpi/pci_irq.c @@ -410,6 +410,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev) char *link = NULL; char link_desc[16]; int rc; + struct fwnode_handle *irq_domain; pin = dev->pin; if (!pin) { @@ -438,7 +439,8 @@ int acpi_pci_irq_enable(struct pci_dev *dev) gsi = acpi_pci_link_allocate_irq(entry->link, entry->index, &triggering, &polarity, - &link); + &link, + &irq_domain); else gsi = entry->index; } else @@ -462,7 +464,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev) return 0; } - rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity); + rc = acpi_register_irq(&dev->dev, gsi, triggering, polarity, irq_domain); if (rc < 0) { dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n", pin_name(pin)); diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c index fb4c5632a232..219a644d739a 100644 --- a/drivers/acpi/pci_link.c +++ b/drivers/acpi/pci_link.c @@ -59,6 +59,7 @@ struct acpi_pci_link_irq { u8 resource_type; u8 possible_count; u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; + struct acpi_resource_source resource_source; u8 initialized:1; u8 reserved:7; }; @@ -120,6 +121,8 @@ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, { struct acpi_resource_extended_irq *p = &resource->data.extended_irq; + struct acpi_resource_source *rs = + &link->irq.resource_source; if (!p || !p->interrupt_count) { printk(KERN_WARNING PREFIX "Blank _PRS EXT IRQ resource\n"); @@ -140,6 +143,12 @@ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, link->irq.triggering = p->triggering; link->irq.polarity = p->polarity; link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; + if (p->resource_source.string_length) { + rs->index = p->resource_source.index; + rs->string_length = p->resource_source.string_length; + rs->string_ptr = kmalloc(rs->string_length, GFP_KERNEL); + strcpy(rs->string_ptr, p->resource_source.string_ptr); + } break; } default: @@ -326,7 +335,8 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) resource->res.data.extended_irq.shareable = ACPI_SHARED; resource->res.data.extended_irq.interrupt_count = 1; resource->res.data.extended_irq.interrupts[0] = irq; - /* ignore resource_source, it's optional */ + resource->res.data.extended_irq.resource_source = + link->irq.resource_source; break; default: printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); @@ -612,7 +622,7 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link) * failure: return -1 */ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, - int *polarity, char **name) + int *polarity, char **name, struct fwnode_handle **irq_domain) { int result; struct acpi_device *device; @@ -656,6 +666,9 @@ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, *polarity = link->irq.polarity; if (name) *name = acpi_device_bid(link->device); + if (irq_domain) + *irq_domain = acpi_get_irq_source_fwhandle(&link->irq.resource_source); + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link %s is referenced\n", acpi_device_bid(link->device))); diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h index 5eb175933a5b..6ff1ea76d476 100644 --- a/include/acpi/acpi_drivers.h +++ b/include/acpi/acpi_drivers.h @@ -68,7 +68,7 @@ int acpi_irq_penalty_init(void); int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, - int *polarity, char **name); + int *polarity, char **name, struct fwnode_handle **irq_domain); int acpi_pci_link_free_irq(acpi_handle handle); /* ACPI PCI Device Binding (pci_bind.c) */ diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 39263c6b52e1..5f1d7d3192fb 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -324,6 +324,8 @@ extern int sbf_port; extern unsigned long acpi_realmode_flags; int acpi_register_gsi (struct device *dev, u32 gsi, int triggering, int polarity); +int acpi_register_irq(struct device *dev, u32 gsi, int trigger, + int polarity, struct fwnode_handle *domain_id); int acpi_gsi_to_irq (u32 gsi, unsigned int *irq); int acpi_isa_irq_to_gsi (unsigned isa_irq, u32 *gsi); @@ -336,6 +338,8 @@ struct irq_domain *acpi_irq_create_hierarchy(unsigned int flags, const struct irq_domain_ops *ops, void *host_data); +struct fwnode_handle *acpi_get_irq_source_fwhandle(const struct acpi_resource_source *source); + #ifdef CONFIG_X86_IO_APIC extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity); #else