[Xen-devel] Re: [PATCH 16/20] x86: Introduce x86_msi_ops

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Aug 31, 2010 at 02:31:40PM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, Aug 04, 2010 at 02:19:11PM -0400, Konrad Rzeszutek Wilk wrote:
> > From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > 
> > Introduce an x86 specific indirect mechanism to setup MSIs.
> > The MSI setup functions become function pointers in an x86_msi_ops
> > struct, that defaults to the implementation in io_apic.c
> 
> Hey Peter,
> 
> I was wondering if you have time to take a look at this?

ping?
> 
> The patchset introduces a driver which takes care of allowing
> pci_conf_read/write in a virtualized environements with PCI
> passthrough devices. Unfortunatly for MSI operations that is not
> so simple, so this patch alongside with the previous one
> (https://patchwork.kernel.org/patch/117105/)
> expands the arch_* calls. This makes it possible to register on top
> of the native callback (the virtualized ones can), if required.
> 
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> > Cc: x86@xxxxxxxxxx
> > Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
> > ---
> >  arch/x86/include/asm/pci.h      |   26 +++++++++++++++++++++++---
> >  arch/x86/include/asm/x86_init.h |    9 +++++++++
> >  arch/x86/kernel/apic/io_apic.c  |    8 ++++----
> >  arch/x86/kernel/x86_init.c      |    6 ++++++
> >  4 files changed, 42 insertions(+), 7 deletions(-)
> > 
> > diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> > index bcf84e1..861d0d0 100644
> > --- a/arch/x86/include/asm/pci.h
> > +++ b/arch/x86/include/asm/pci.h
> > @@ -7,6 +7,7 @@
> >  #include <linux/string.h>
> >  #include <asm/scatterlist.h>
> >  #include <asm/io.h>
> > +#include <asm/x86_init.h>
> >  
> >  #ifdef __KERNEL__
> >  
> > @@ -92,9 +93,28 @@ static inline void early_quirks(void) { }
> >  
> >  extern void pci_iommu_alloc(void);
> >  
> > -/* MSI arch hook */
> > -#define arch_setup_msi_irqs arch_setup_msi_irqs
> > -#define arch_teardown_msi_irqs arch_teardown_msi_irqs
> > +/* 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);
> > +}
> > +
> > +#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
> > +int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
> > +void native_teardown_msi_irq(unsigned int irq);
> > +void native_teardown_msi_irqs(struct pci_dev *dev);
> >  
> >  #define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
> >  
> > diff --git a/arch/x86/include/asm/x86_init.h 
> > b/arch/x86/include/asm/x86_init.h
> > index baa579c..64642ad 100644
> > --- a/arch/x86/include/asm/x86_init.h
> > +++ b/arch/x86/include/asm/x86_init.h
> > @@ -154,9 +154,18 @@ struct x86_platform_ops {
> >     int (*i8042_detect)(void);
> >  };
> >  
> > +struct pci_dev;
> > +
> > +struct x86_msi_ops {
> > +   int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
> > +   void (*teardown_msi_irq)(unsigned int irq);
> > +   void (*teardown_msi_irqs)(struct pci_dev *dev);
> > +};
> > +
> >  extern struct x86_init_ops x86_init;
> >  extern struct x86_cpuinit_ops x86_cpuinit;
> >  extern struct x86_platform_ops x86_platform;
> > +extern struct x86_msi_ops x86_msi;
> >  
> >  extern void x86_init_noop(void);
> >  extern void x86_init_uint_noop(unsigned int unused);
> > diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> > index a8d069e..0b552ec 100644
> > --- a/arch/x86/kernel/apic/io_apic.c
> > +++ b/arch/x86/kernel/apic/io_apic.c
> > @@ -3531,7 +3531,7 @@ static int setup_msi_irq(struct pci_dev *dev, struct 
> > msi_desc *msidesc, int irq)
> >     return 0;
> >  }
> >  
> > -int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> > +int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> >  {
> >     unsigned int irq;
> >     int ret, sub_handle;
> > @@ -3592,12 +3592,12 @@ error:
> >     return ret;
> >  }
> >  
> > -void arch_teardown_msi_irq(unsigned int irq)
> > +void native_teardown_msi_irq(unsigned int irq)
> >  {
> >     destroy_irq(irq);
> >  }
> >  
> > -void arch_teardown_msi_irqs(struct pci_dev *dev)
> > +void native_teardown_msi_irqs(struct pci_dev *dev)
> >  {
> >     struct msi_desc *entry;
> >  
> > @@ -3607,7 +3607,7 @@ void arch_teardown_msi_irqs(struct pci_dev *dev)
> >                     continue;
> >             nvec = 1 << entry->msi_attrib.multiple;
> >             for (i = 0; i < nvec; i++)
> > -                   arch_teardown_msi_irq(entry->irq + i);
> > +                   x86_msi.teardown_msi_irq(entry->irq + i);
> >     }
> >  }
> >  
> > diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> > index cd6da6b..91b5209 100644
> > --- a/arch/x86/kernel/x86_init.c
> > +++ b/arch/x86/kernel/x86_init.c
> > @@ -6,6 +6,7 @@
> >  #include <linux/init.h>
> >  #include <linux/ioport.h>
> >  #include <linux/module.h>
> > +#include <linux/pci.h>
> >  
> >  #include <asm/bios_ebda.h>
> >  #include <asm/paravirt.h>
> > @@ -99,3 +100,8 @@ struct x86_platform_ops x86_platform = {
> >  };
> >  
> >  EXPORT_SYMBOL_GPL(x86_platform);
> > +struct x86_msi_ops x86_msi = {
> > +   .setup_msi_irqs = native_setup_msi_irqs,
> > +   .teardown_msi_irq = native_teardown_msi_irq,
> > +   .teardown_msi_irqs = native_teardown_msi_irqs,
> > +};
> > -- 
> > 1.7.0.1
> > 
> > --
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