From 3a05d08f6cc75b74079290c33d6127b2857226fa Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 30 Mar 2021 16:11:38 +0100 Subject: PCI/MSI: Drop use of msi_controller from core code As there is no driver using msi_controller, we can now safely remove its use from the PCI probe code. Link: https://lore.kernel.org/r/20210330151145.997953-8-maz@kernel.org Signed-off-by: Marc Zyngier Signed-off-by: Lorenzo Pieralisi Acked-by: Bjorn Helgaas --- include/linux/pci.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include') diff --git a/include/linux/pci.h b/include/linux/pci.h index 86c799c97b77..ebf557e59d87 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -540,7 +540,6 @@ struct pci_host_bridge { int (*map_irq)(const struct pci_dev *, u8, u8); void (*release_fn)(struct pci_host_bridge *); void *release_data; - struct msi_controller *msi; unsigned int ignore_reset_delay:1; /* For entire hierarchy */ unsigned int no_ext_tags:1; /* No Extended Tags */ unsigned int native_aer:1; /* OS may use PCIe AER */ @@ -621,7 +620,6 @@ struct pci_bus { struct resource busn_res; /* Bus numbers routed to this bus */ struct pci_ops *ops; /* Configuration access functions */ - struct msi_controller *msi; /* MSI controller */ void *sysdata; /* Hook for sys-specific extension */ struct proc_dir_entry *procdir; /* Directory entry in /proc/bus/pci */ -- cgit v1.3-14-g43fede From b227be0d7314d0869d4e28c199ac1fc7075cf06e Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 30 Mar 2021 16:11:39 +0100 Subject: PCI/MSI: Kill msi_controller structure msi_controller had a good, long life as the abstraction for a driver providing MSIs to PCI devices. But it has been replaced in all drivers by the more expressive generic MSI framework. Farewell, struct msi_controller. Link: https://lore.kernel.org/r/20210330151145.997953-9-maz@kernel.org Signed-off-by: Marc Zyngier Signed-off-by: Lorenzo Pieralisi Acked-by: Bjorn Helgaas --- include/linux/msi.h | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) (limited to 'include') diff --git a/include/linux/msi.h b/include/linux/msi.h index aef35fd1cf11..3f21e77b57b7 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -240,8 +240,7 @@ void pci_msi_unmask_irq(struct irq_data *data); /* * The arch hooks to setup up msi irqs. Default functions are implemented * as weak symbols so that they /can/ be overriden by architecture specific - * code if needed. These hooks must be enabled by the architecture or by - * drivers which depend on them via msi_controller based MSI handling. + * code if needed. These hooks can only be enabled by the architecture. * * If CONFIG_PCI_MSI_ARCH_FALLBACKS is not selected they are replaced by * stubs with warnings. @@ -272,19 +271,6 @@ static inline void arch_teardown_msi_irqs(struct pci_dev *dev) void arch_restore_msi_irqs(struct pci_dev *dev); void default_restore_msi_irqs(struct pci_dev *dev); -struct msi_controller { - struct module *owner; - struct device *dev; - struct device_node *of_node; - struct list_head list; - - int (*setup_irq)(struct msi_controller *chip, struct pci_dev *dev, - struct msi_desc *desc); - int (*setup_irqs)(struct msi_controller *chip, struct pci_dev *dev, - int nvec, int type); - void (*teardown_irq)(struct msi_controller *chip, unsigned int irq); -}; - #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN #include -- cgit v1.3-14-g43fede From f8bcf249d9cf292c6ceb3d9f5bd90815090f5286 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 30 Mar 2021 16:11:40 +0100 Subject: PCI/MSI: Kill default_teardown_msi_irqs() It doesn't have any caller left. Link: https://lore.kernel.org/r/20210330151145.997953-10-maz@kernel.org Signed-off-by: Marc Zyngier Signed-off-by: Lorenzo Pieralisi Acked-by: Bjorn Helgaas --- drivers/pci/msi.c | 11 +---------- include/linux/msi.h | 1 - 2 files changed, 1 insertion(+), 11 deletions(-) (limited to 'include') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 79b5a995bd02..d9c73c173c14 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -94,11 +94,7 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) return 0; } -/* - * We have a default implementation available as a separate non-weak - * function, as it is used by the Xen x86 PCI code - */ -void default_teardown_msi_irqs(struct pci_dev *dev) +void __weak arch_teardown_msi_irqs(struct pci_dev *dev) { int i; struct msi_desc *entry; @@ -108,11 +104,6 @@ void default_teardown_msi_irqs(struct pci_dev *dev) for (i = 0; i < entry->nvec_used; i++) arch_teardown_msi_irq(entry->irq + i); } - -void __weak arch_teardown_msi_irqs(struct pci_dev *dev) -{ - return default_teardown_msi_irqs(dev); -} #endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */ static void default_restore_msi_irq(struct pci_dev *dev, int irq) diff --git a/include/linux/msi.h b/include/linux/msi.h index 3f21e77b57b7..6aff469e511d 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -250,7 +250,6 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc); void arch_teardown_msi_irq(unsigned int irq); int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); void arch_teardown_msi_irqs(struct pci_dev *dev); -void default_teardown_msi_irqs(struct pci_dev *dev); #else static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) { -- cgit v1.3-14-g43fede From 94e89b145371b68fa0ea294855adebcd03e0522e Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 30 Mar 2021 16:11:41 +0100 Subject: PCI/MSI: Let PCI host bridges declare their reliance on MSI domains There is a whole class of host bridges that cannot know whether MSIs will be provided or not, as they rely on other blocks to provide the MSI functionnality, using MSI domains. This is the case for example on systems that use the ARM GIC architecture. Introduce a new attribute ('msi_domain') indicating that implicit dependency, and use this property to set the NO_MSI flag when no MSI domain is found at probe time. Link: https://lore.kernel.org/r/20210330151145.997953-11-maz@kernel.org Signed-off-by: Marc Zyngier Signed-off-by: Lorenzo Pieralisi Acked-by: Bjorn Helgaas --- drivers/pci/probe.c | 2 ++ include/linux/pci.h | 1 + 2 files changed, 3 insertions(+) (limited to 'include') diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index fb04fc81a8bd..aa6fba35f5d1 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -925,6 +925,8 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge) device_enable_async_suspend(bus->bridge); pci_set_bus_of_node(bus); pci_set_bus_msi_domain(bus); + if (bridge->msi_domain && !dev_get_msi_domain(&bus->dev)) + bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; if (!parent) set_dev_node(bus->bridge, pcibus_to_node(bus)); diff --git a/include/linux/pci.h b/include/linux/pci.h index ebf557e59d87..ede0aef2cfd4 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -550,6 +550,7 @@ struct pci_host_bridge { unsigned int native_dpc:1; /* OS may use PCIe DPC */ unsigned int preserve_config:1; /* Preserve FW resource setup */ unsigned int size_windows:1; /* Enable root bus sizing */ + unsigned int msi_domain:1; /* Bridge wants MSI domain */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev, -- cgit v1.3-14-g43fede