From 4287d824f265451cd10f6d20266b27a207a6cdd7 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Fri, 9 Aug 2013 22:27:06 +0200 Subject: [PATCH] PCI: use weak functions for MSI arch-specific functions Until now, the MSI architecture-specific functions could be overloaded using a fairly complex set of #define and compile-time conditionals. In order to prepare for the introduction of the msi_chip infrastructure, it is desirable to switch all those functions to use the 'weak' mechanism. This commit converts all the architectures that were overidding those MSI functions to use the new strategy. Note that we keep two separate, non-weak, functions default_teardown_msi_irqs() and default_restore_msi_irqs() for the default behavior of the arch_teardown_msi_irqs() and arch_restore_msi_irqs(), as the default behavior is needed by x86 PCI code. Signed-off-by: Thomas Petazzoni Acked-by: Bjorn Helgaas Acked-by: Benjamin Herrenschmidt Tested-by: Daniel Price Tested-by: Thierry Reding Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: linux390@de.ibm.com Cc: linux-s390@vger.kernel.org Cc: Thomas Gleixner Cc: Ingo Molnar Cc: H. Peter Anvin Cc: x86@kernel.org Cc: Russell King Cc: Tony Luck Cc: Fenghua Yu Cc: linux-ia64@vger.kernel.org Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: David S. Miller Cc: sparclinux@vger.kernel.org Cc: Chris Metcalf Signed-off-by: Jason Cooper --- arch/mips/include/asm/pci.h | 5 ---- arch/powerpc/include/asm/pci.h | 5 ---- arch/s390/include/asm/pci.h | 4 --- arch/x86/include/asm/pci.h | 30 --------------------- arch/x86/kernel/x86_init.c | 24 +++++++++++++++++ drivers/pci/msi.c | 48 +++++++++++++++++----------------- include/linux/msi.h | 8 +++++- 7 files changed, 55 insertions(+), 69 deletions(-) diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h index fa8e0aa250ca..f194c08bd057 100644 --- a/arch/mips/include/asm/pci.h +++ b/arch/mips/include/asm/pci.h @@ -136,11 +136,6 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel) return channel ? 15 : 14; } -#ifdef CONFIG_CPU_CAVIUM_OCTEON -/* MSI arch hook for OCTEON */ -#define arch_setup_msi_irqs arch_setup_msi_irqs -#endif - extern char * (*pcibios_plat_setup)(char *str); #ifdef CONFIG_OF diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h index 6653f2743c4e..95145a15c708 100644 --- a/arch/powerpc/include/asm/pci.h +++ b/arch/powerpc/include/asm/pci.h @@ -113,11 +113,6 @@ extern int pci_domain_nr(struct pci_bus *bus); /* Decide whether to display the domain number in /proc */ extern int pci_proc_domain(struct pci_bus *bus); -/* MSI arch hooks */ -#define arch_setup_msi_irqs arch_setup_msi_irqs -#define arch_teardown_msi_irqs arch_teardown_msi_irqs -#define arch_msi_check_device arch_msi_check_device - struct vm_area_struct; /* Map a range of PCI memory or I/O space for a device into user space */ int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma, diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index 6e577ba0e5da..262b91bb8811 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -21,10 +21,6 @@ void pci_iounmap(struct pci_dev *, void __iomem *); int pci_domain_nr(struct pci_bus *); int pci_proc_domain(struct pci_bus *); -/* MSI arch hooks */ -#define arch_setup_msi_irqs arch_setup_msi_irqs -#define arch_teardown_msi_irqs arch_teardown_msi_irqs - #define ZPCI_BUS_NR 0 /* default bus number */ #define ZPCI_DEVFN 0 /* default device number */ diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h index d9e9e6c7ed32..7d7443283a9d 100644 --- a/arch/x86/include/asm/pci.h +++ b/arch/x86/include/asm/pci.h @@ -100,29 +100,6 @@ static inline void early_quirks(void) { } extern void pci_iommu_alloc(void); #ifdef CONFIG_PCI_MSI -/* MSI arch specific hooks */ -static inline int x86_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) -{ - return x86_msi.setup_msi_irqs(dev, nvec, type); -} - -static inline void x86_teardown_msi_irqs(struct pci_dev *dev) -{ - x86_msi.teardown_msi_irqs(dev); -} - -static inline void x86_teardown_msi_irq(unsigned int irq) -{ - x86_msi.teardown_msi_irq(irq); -} -static inline void x86_restore_msi_irqs(struct pci_dev *dev, int irq) -{ - x86_msi.restore_msi_irqs(dev, irq); -} -#define arch_setup_msi_irqs x86_setup_msi_irqs -#define arch_teardown_msi_irqs x86_teardown_msi_irqs -#define arch_teardown_msi_irq x86_teardown_msi_irq -#define arch_restore_msi_irqs x86_restore_msi_irqs /* implemented in arch/x86/kernel/apic/io_apic. */ struct msi_desc; int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type); @@ -130,16 +107,9 @@ void native_teardown_msi_irq(unsigned int irq); void native_restore_msi_irqs(struct pci_dev *dev, int irq); int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, unsigned int irq_base, unsigned int irq_offset); -/* default to the implementation in drivers/lib/msi.c */ -#define HAVE_DEFAULT_MSI_TEARDOWN_IRQS -#define HAVE_DEFAULT_MSI_RESTORE_IRQS -void default_teardown_msi_irqs(struct pci_dev *dev); -void default_restore_msi_irqs(struct pci_dev *dev, int irq); #else #define native_setup_msi_irqs NULL #define native_teardown_msi_irq NULL -#define default_teardown_msi_irqs NULL -#define default_restore_msi_irqs NULL #endif #define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys) diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c index 45a14dbbddaf..5587f991d111 100644 --- a/arch/x86/kernel/x86_init.c +++ b/arch/x86/kernel/x86_init.c @@ -107,6 +107,8 @@ struct x86_platform_ops x86_platform = { }; EXPORT_SYMBOL_GPL(x86_platform); + +#if defined(CONFIG_PCI_MSI) struct x86_msi_ops x86_msi = { .setup_msi_irqs = native_setup_msi_irqs, .compose_msi_msg = native_compose_msi_msg, @@ -116,6 +118,28 @@ struct x86_msi_ops x86_msi = { .setup_hpet_msi = default_setup_hpet_msi, }; +/* MSI arch specific hooks */ +int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +{ + return x86_msi.setup_msi_irqs(dev, nvec, type); +} + +void arch_teardown_msi_irqs(struct pci_dev *dev) +{ + x86_msi.teardown_msi_irqs(dev); +} + +void arch_teardown_msi_irq(unsigned int irq) +{ + x86_msi.teardown_msi_irq(irq); +} + +void arch_restore_msi_irqs(struct pci_dev *dev, int irq) +{ + x86_msi.restore_msi_irqs(dev, irq); +} +#endif + struct x86_io_apic_ops x86_io_apic_ops = { .init = native_io_apic_init_mappings, .read = native_io_apic_read, diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index aca7578b05e5..823c3861c4d8 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -30,20 +30,21 @@ static int pci_msi_enable = 1; /* Arch hooks */ -#ifndef arch_msi_check_device -int arch_msi_check_device(struct pci_dev *dev, int nvec, int type) +int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) { - return 0; + return -EINVAL; } -#endif -#ifndef arch_setup_msi_irqs -# define arch_setup_msi_irqs default_setup_msi_irqs -# define HAVE_DEFAULT_MSI_SETUP_IRQS -#endif +void __weak arch_teardown_msi_irq(unsigned int irq) +{ +} -#ifdef HAVE_DEFAULT_MSI_SETUP_IRQS -int default_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type) +{ + return 0; +} + +int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) { struct msi_desc *entry; int ret; @@ -65,14 +66,11 @@ int default_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) return 0; } -#endif - -#ifndef arch_teardown_msi_irqs -# define arch_teardown_msi_irqs default_teardown_msi_irqs -# define HAVE_DEFAULT_MSI_TEARDOWN_IRQS -#endif -#ifdef HAVE_DEFAULT_MSI_TEARDOWN_IRQS +/* + * 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) { struct msi_desc *entry; @@ -89,14 +87,12 @@ void default_teardown_msi_irqs(struct pci_dev *dev) arch_teardown_msi_irq(entry->irq + i); } } -#endif -#ifndef arch_restore_msi_irqs -# define arch_restore_msi_irqs default_restore_msi_irqs -# define HAVE_DEFAULT_MSI_RESTORE_IRQS -#endif +void __weak arch_teardown_msi_irqs(struct pci_dev *dev) +{ + return default_teardown_msi_irqs(dev); +} -#ifdef HAVE_DEFAULT_MSI_RESTORE_IRQS void default_restore_msi_irqs(struct pci_dev *dev, int irq) { struct msi_desc *entry; @@ -114,7 +110,11 @@ void default_restore_msi_irqs(struct pci_dev *dev, int irq) if (entry) write_msi_msg(irq, &entry->msg); } -#endif + +void __weak arch_restore_msi_irqs(struct pci_dev *dev, int irq) +{ + return default_restore_msi_irqs(dev, irq); +} static void msi_set_enable(struct pci_dev *dev, int enable) { diff --git a/include/linux/msi.h b/include/linux/msi.h index ee66f3a12fb6..271dfd14a05f 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -51,12 +51,18 @@ struct msi_desc { }; /* - * The arch hook for setup up msi irqs + * The arch hooks to setup up msi irqs. Those functions are + * implemented as weak symbols so that they /can/ be overriden by + * architecture specific code if needed. */ 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); int arch_msi_check_device(struct pci_dev* dev, int nvec, int type); +void arch_restore_msi_irqs(struct pci_dev *dev, int irq); + +void default_teardown_msi_irqs(struct pci_dev *dev); +void default_restore_msi_irqs(struct pci_dev *dev, int irq); #endif /* LINUX_MSI_H */ -- 2.20.1