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Re: [Xen-devel] [PATCH 1/2] xen/arm, arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..."

Hi Russell,

Given the outstanding regression we need to fix as soon as possible,
I'll queue these patches on the xentip tree for 4.12.

Please shout if you disagree.

Thank you.

- Stefano


On Wed, 19 Apr 2017, Stefano Stabellini wrote:
> Hello Russell,
> 
> Can I have your acked-by on the following fix (original patch is
> 1492117462-19886-1-git-send-email-sstabellini@xxxxxxxxxx)?
> 
> Thanks,
> 
> Stefano
> 
> 
> On Tue, 18 Apr 2017, Catalin Marinas wrote:
> > On Thu, Apr 13, 2017 at 02:04:21PM -0700, Stefano Stabellini wrote:
> > > The following commit:
> > > 
> > >   commit 815dd18788fe0d41899f51b91d0560279cf16b0d
> > >   Author: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
> > >   Date:   Fri Jan 20 13:04:04 2017 -0800
> > > 
> > >       treewide: Consolidate get_dma_ops() implementations
> > > 
> > > rearranges get_dma_ops in a way that xen_dma_ops are not returned when
> > > running on Xen anymore, dev->dma_ops is returned instead (see
> > > arch/arm/include/asm/dma-mapping.h:get_arch_dma_ops and
> > > include/linux/dma-mapping.h:get_dma_ops).
> > > 
> > > Fix the problem by storing dev->dma_ops in dev_archdata, and setting
> > > dev->dma_ops to xen_dma_ops. This way, xen_dma_ops is returned naturally
> > > by get_dma_ops. The Xen code can retrieve the original dev->dma_ops from
> > > dev_archdata when needed. It also allows us to remove __generic_dma_ops
> > > from common headers.
> > > 
> > > Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> > > Tested-by: Julien Grall <julien.grall@xxxxxxx>
> > > Suggested-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> > > CC: linux@xxxxxxxxxxxxxxx
> > > CC: catalin.marinas@xxxxxxx
> > > CC: will.deacon@xxxxxxx
> > > CC: boris.ostrovsky@xxxxxxxxxx
> > > CC: jgross@xxxxxxxx
> > > CC: Julien Grall <julien.grall@xxxxxxx>
> > 
> > Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> > 
> > 
> > > diff --git a/arch/arm/include/asm/device.h b/arch/arm/include/asm/device.h
> > > index 220ba20..36ec9c8 100644
> > > --- a/arch/arm/include/asm/device.h
> > > +++ b/arch/arm/include/asm/device.h
> > > @@ -16,6 +16,9 @@ struct dev_archdata {
> > >  #ifdef CONFIG_ARM_DMA_USE_IOMMU
> > >   struct dma_iommu_mapping        *mapping;
> > >  #endif
> > > +#ifdef CONFIG_XEN
> > > + const struct dma_map_ops *dev_dma_ops;
> > > +#endif
> > >   bool dma_coherent;
> > >  };
> > >  
> > > diff --git a/arch/arm/include/asm/dma-mapping.h 
> > > b/arch/arm/include/asm/dma-mapping.h
> > > index 7166569..680d3f3 100644
> > > --- a/arch/arm/include/asm/dma-mapping.h
> > > +++ b/arch/arm/include/asm/dma-mapping.h
> > > @@ -16,19 +16,9 @@
> > >  extern const struct dma_map_ops arm_dma_ops;
> > >  extern const struct dma_map_ops arm_coherent_dma_ops;
> > >  
> > > -static inline const struct dma_map_ops *__generic_dma_ops(struct device 
> > > *dev)
> > > -{
> > > - if (dev && dev->dma_ops)
> > > -         return dev->dma_ops;
> > > - return &arm_dma_ops;
> > > -}
> > > -
> > >  static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type 
> > > *bus)
> > >  {
> > > - if (xen_initial_domain())
> > > -         return xen_dma_ops;
> > > - else
> > > -         return __generic_dma_ops(NULL);
> > > + return &arm_dma_ops;
> > >  }
> > >  
> > >  #define HAVE_ARCH_DMA_SUPPORTED 1
> > > diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> > > index 63eabb0..a614459 100644
> > > --- a/arch/arm/mm/dma-mapping.c
> > > +++ b/arch/arm/mm/dma-mapping.c
> > > @@ -2396,6 +2396,13 @@ void arch_setup_dma_ops(struct device *dev, u64 
> > > dma_base, u64 size,
> > >           dma_ops = arm_get_dma_map_ops(coherent);
> > >  
> > >   set_dma_ops(dev, dma_ops);
> > > +
> > > +#ifdef CONFIG_XEN
> > > + if (xen_initial_domain()) {
> > > +         dev->archdata.dev_dma_ops = dev->dma_ops;
> > > +         dev->dma_ops = xen_dma_ops;
> > > + }
> > > +#endif
> > >  }
> > >  
> > >  void arch_teardown_dma_ops(struct device *dev)
> > > diff --git a/arch/arm64/include/asm/device.h 
> > > b/arch/arm64/include/asm/device.h
> > > index 73d5bab..5a5fa47 100644
> > > --- a/arch/arm64/include/asm/device.h
> > > +++ b/arch/arm64/include/asm/device.h
> > > @@ -20,6 +20,9 @@ struct dev_archdata {
> > >  #ifdef CONFIG_IOMMU_API
> > >   void *iommu;                    /* private IOMMU data */
> > >  #endif
> > > +#ifdef CONFIG_XEN
> > > + const struct dma_map_ops *dev_dma_ops;
> > > +#endif
> > >   bool dma_coherent;
> > >  };
> > >  
> > > diff --git a/arch/arm64/include/asm/dma-mapping.h 
> > > b/arch/arm64/include/asm/dma-mapping.h
> > > index 505756c..5392dbe 100644
> > > --- a/arch/arm64/include/asm/dma-mapping.h
> > > +++ b/arch/arm64/include/asm/dma-mapping.h
> > > @@ -27,11 +27,8 @@
> > >  #define DMA_ERROR_CODE   (~(dma_addr_t)0)
> > >  extern const struct dma_map_ops dummy_dma_ops;
> > >  
> > > -static inline const struct dma_map_ops *__generic_dma_ops(struct device 
> > > *dev)
> > > +static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type 
> > > *bus)
> > >  {
> > > - if (dev && dev->dma_ops)
> > > -         return dev->dma_ops;
> > > -
> > >   /*
> > >    * We expect no ISA devices, and all other DMA masters are expected to
> > >    * have someone call arch_setup_dma_ops at device creation time.
> > > @@ -39,14 +36,6 @@ static inline const struct dma_map_ops 
> > > *__generic_dma_ops(struct device *dev)
> > >   return &dummy_dma_ops;
> > >  }
> > >  
> > > -static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type 
> > > *bus)
> > > -{
> > > - if (xen_initial_domain())
> > > -         return xen_dma_ops;
> > > - else
> > > -         return __generic_dma_ops(NULL);
> > > -}
> > > -
> > >  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> > >                   const struct iommu_ops *iommu, bool coherent);
> > >  #define arch_setup_dma_ops       arch_setup_dma_ops
> > > diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> > > index 81cdb2e..7f8b37e 100644
> > > --- a/arch/arm64/mm/dma-mapping.c
> > > +++ b/arch/arm64/mm/dma-mapping.c
> > > @@ -977,4 +977,11 @@ void arch_setup_dma_ops(struct device *dev, u64 
> > > dma_base, u64 size,
> > >  
> > >   dev->archdata.dma_coherent = coherent;
> > >   __iommu_setup_dma_ops(dev, dma_base, size, iommu);
> > > +
> > > +#ifdef CONFIG_XEN
> > > + if (xen_initial_domain()) {
> > > +         dev->archdata.dev_dma_ops = dev->dma_ops;
> > > +         dev->dma_ops = xen_dma_ops;
> > > + }
> > > +#endif
> > >  }
> > > diff --git a/include/xen/arm/page-coherent.h 
> > > b/include/xen/arm/page-coherent.h
> > > index 95ce6ac..b0a2bfc 100644
> > > --- a/include/xen/arm/page-coherent.h
> > > +++ b/include/xen/arm/page-coherent.h
> > > @@ -2,8 +2,16 @@
> > >  #define _ASM_ARM_XEN_PAGE_COHERENT_H
> > >  
> > >  #include <asm/page.h>
> > > +#include <asm/dma-mapping.h>
> > >  #include <linux/dma-mapping.h>
> > >  
> > > +static inline const struct dma_map_ops *__generic_dma_ops(struct device 
> > > *dev)
> > > +{
> > > + if (dev && dev->archdata.dev_dma_ops)
> > > +         return dev->archdata.dev_dma_ops;
> > > + return get_arch_dma_ops(NULL);
> > > +}
> > > +
> > >  void __xen_dma_map_page(struct device *hwdev, struct page *page,
> > >        dma_addr_t dev_addr, unsigned long offset, size_t size,
> > >        enum dma_data_direction dir, unsigned long attrs);
> 

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