[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v02 2/7] arm: omap: introduce iommu translation for IPU remoteproc
On Thu, 2014-06-26 at 14:07 +0300, Andrii Tseglytskyi wrote: > The following patch introduced platform specific MMU data > definitions and pagetable translation function for OMAP5 IPU > remoteproc. This MMU is a bit specific - it typically performs > one level translation and map a big chunks of memory. 16 Mb > supersections and 1 Mb sections are mapped instead of 4 Kb pages. > Introduced algorithm performs internal remapping of big sections > to small 4 Kb pages. How does that work if the MMU only supports 1MB/16MB supersections? Or have I misunderstood? > Change-Id: If20449f07e22f780e1fded67fed4f79cbe1fc156 > Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@xxxxxxxxxxxxxxx> > --- > xen/arch/arm/platforms/Makefile | 1 + > xen/arch/arm/platforms/omap_iommu.c | 247 > +++++++++++++++++++++++++++++++++++ I don't think this is the right home for this. I think either xen/arch/arm/remoteproc/* or xen/drivers/remoteproc/* would be more appropriate. > +#define OMAP_IPU_MMU_MEM_BASE 0x55082000 > + > +static u32 mmu_ipu_translate_pagetable(struct mmu_info *mmu, struct > mmu_pagetable *pgt); > + > +static u32 ipu_trap_offsets[] = { > + MMU_IPU_TTB_OFFSET, How large is this region? I think the machinery needs to be told. Also if this functionality is to be used by guests then it can't really use the h/w base address, you'd need to define a region of guest address map (!= host/dom0 address map) for it. > diff --git a/xen/arch/arm/remoteproc_iommu.c b/xen/arch/arm/remoteproc_iommu.c > index b4d22d9..8291f3f 100644 > --- a/xen/arch/arm/remoteproc_iommu.c > +++ b/xen/arch/arm/remoteproc_iommu.c > @@ -33,6 +33,7 @@ > #include "io.h" > > static struct mmu_info *mmu_list[] = { > + &omap_ipu_mmu, This suggests there is exactly one such and it is exposed to every domain. Wouldn't this rather be dynamic and per domain? Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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