[PATCHv4 02/11] pci: use weak functions for MSI arch-specific functions
Bjorn Helgaas
bhelgaas at google.com
Fri Jul 5 17:32:13 EDT 2013
On Mon, Jul 1, 2013 at 7:42 AM, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> 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 a separate, non-weak, function
> default_teardown_msi_irqs() for the default behavior of the
> arch_teardown_msi_irqs(), as the default behavior is needed by the Xen
> x86 PCI code.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Cc: Paul Mackerras <paulus at samba.org>
> Cc: linuxppc-dev at lists.ozlabs.org
> Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
> Cc: linux390 at de.ibm.com
> Cc: linux-s390 at vger.kernel.org
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Cc: Ingo Molnar <mingo at redhat.com>
> Cc: H. Peter Anvin <hpa at zytor.com>
> Cc: x86 at kernel.org
> Cc: Russell King <linux at arm.linux.org.uk>
> Cc: Tony Luck <tony.luck at intel.com>
> Cc: Fenghua Yu <fenghua.yu at intel.com>
> Cc: linux-ia64 at vger.kernel.org
> Cc: Ralf Baechle <ralf at linux-mips.org>
> Cc: linux-mips at linux-mips.org
> Cc: David S. Miller <davem at davemloft.net>
> Cc: sparclinux at vger.kernel.org
> Cc: Chris Metcalf <cmetcalf at tilera.com>
Acked-by: Bjorn Helgaas <bhelgaas at google.com>
> ---
> 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 | 28 --------------------------
> arch/x86/kernel/x86_init.c | 21 ++++++++++++++++++++
> drivers/pci/msi.c | 45 +++++++++++++++++++-----------------------
> include/linux/msi.h | 7 ++++++-
> 7 files changed, 47 insertions(+), 68 deletions(-)
>
> diff --git a/arch/mips/include/asm/pci.h b/arch/mips/include/asm/pci.h
> index b8e24fd..031f4c1 100644
> --- a/arch/mips/include/asm/pci.h
> +++ b/arch/mips/include/asm/pci.h
> @@ -137,11 +137,6 @@ 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 6653f27..95145a1 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 6c18012..8641e8d 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 d9e9e6c..8c61de0 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);
> @@ -130,11 +107,6 @@ 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
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index 45a14db..a2b189c 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -116,6 +116,27 @@ 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);
> +}
> +
> 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 2c10752..289fbfd 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;
> @@ -86,15 +84,13 @@ 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)
> +void __weak arch_restore_msi_irqs(struct pci_dev *dev, int irq)
> {
> struct msi_desc *entry;
>
> @@ -111,7 +107,6 @@ void default_restore_msi_irqs(struct pci_dev *dev, int irq)
> if (entry)
> write_msi_msg(irq, &entry->msg);
> }
> -#endif
>
> static void msi_set_enable(struct pci_dev *dev, int enable)
> {
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index 20c2d6d..c82ff8d 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -50,12 +50,17 @@ 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);
>
> #endif /* LINUX_MSI_H */
> --
> 1.8.1.2
>
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