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...gt; Signed-off-by: Thierry Reding <treding at nvidia.com> > --- > Changes in v3: > - make API 32-bit ARM specific > - avoid extra local variable > > Changes in v2: > - fix compilation > > arch/arm/include/asm/dma-mapping.h | 3 +++ > arch/arm/mm/dma-mapping-nommu.c | 4 ++++ > arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++ > 3 files changed, 23 insertions(+) > > diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h > index 8436f6ade57d..5960e9f3a9d0 100644 > --- a/arch/arm/include/asm/dma-ma...

...anges in v3: > > > - make API 32-bit ARM specific > > > - avoid extra local variable > > > > > > Changes in v2: > > > - fix compilation > > > > > > arch/arm/include/asm/dma-mapping.h | 3 +++ > > > arch/arm/mm/dma-mapping-nommu.c | 4 ++++ > > > arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++ > > > 3 files changed, 23 insertions(+) > > > > > > diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h > > > index 8436f6ade57d..5960e9f3...

...kes use of that new API in the Nouveau driver to fix the regression. Thierry Thierry Reding (2): ARM: dma-mapping: Implement arm_dma_iommu_detach_device() drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping arch/arm/include/asm/dma-mapping.h | 3 +++ arch/arm/mm/dma-mapping-nommu.c | 4 ++++ arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++ .../gpu/drm/nouveau/nvkm/engine/device/tegra.c | 5 +++++ 4 files changed, 28 insertions(+) -- 2.17.0

...ers from detaching from any IOMMU domains that architecture code might have attached them to so that they can take exclusive control of the IOMMU via the IOMMU API. Signed-off-by: Thierry Reding <treding at nvidia.com> --- arch/arm/include/asm/dma-mapping.h | 3 +++ arch/arm/mm/dma-mapping-nommu.c | 4 ++++ arch/arm/mm/dma-mapping.c | 19 +++++++++++++++++++ 3 files changed, 26 insertions(+) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 8436f6ade57d..d6d5bd44f962 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/includ...

...domains that architecture code might have attached them to so that they can take exclusive control of the IOMMU via the IOMMU API. Signed-off-by: Thierry Reding <treding at nvidia.com> --- Changes in v2: - fix compilation arch/arm/include/asm/dma-mapping.h | 3 +++ arch/arm/mm/dma-mapping-nommu.c | 4 ++++ arch/arm/mm/dma-mapping.c | 17 +++++++++++++++++ 3 files changed, 24 insertions(+) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 8436f6ade57d..d6d5bd44f962 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/...

...take exclusive control of the IOMMU via the IOMMU API. Signed-off-by: Thierry Reding <treding at nvidia.com> --- Changes in v3: - make API 32-bit ARM specific - avoid extra local variable Changes in v2: - fix compilation arch/arm/include/asm/dma-mapping.h | 3 +++ arch/arm/mm/dma-mapping-nommu.c | 4 ++++ arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++ 3 files changed, 23 insertions(+) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 8436f6ade57d..5960e9f3a9d0 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/a...

...;>>> - make API 32-bit ARM specific >>>> - avoid extra local variable >>>> >>>> Changes in v2: >>>> - fix compilation >>>> >>>> arch/arm/include/asm/dma-mapping.h | 3 +++ >>>> arch/arm/mm/dma-mapping-nommu.c | 4 ++++ >>>> arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++ >>>> 3 files changed, 23 insertions(+) >>>> >>>> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h >>>> index 8436f6ade57...

...vidia.com> > > --- > > Changes in v3: > > - make API 32-bit ARM specific > > - avoid extra local variable > > > > Changes in v2: > > - fix compilation > > > > arch/arm/include/asm/dma-mapping.h | 3 +++ > > arch/arm/mm/dma-mapping-nommu.c | 4 ++++ > > arch/arm/mm/dma-mapping.c | 16 ++++++++++++++++ > > 3 files changed, 23 insertions(+) > > > > diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h > > index 8436f6ade57d..5960e9f3a9d0 100644 > > ---...

From: Thierry Reding <treding at nvidia.com> Depending on the kernel configuration, early ARM architecture setup code may have attached the GPU to a DMA/IOMMU mapping that transparently uses the IOMMU to back the DMA API. Tegra requires special handling for IOMMU backed buffers (a special bit in the GPU's MMU page tables indicates the memory path to take: via the SMMU or directly to the

...| 8 +- arch/c6x/include/asm/dma-mapping.h | 4 +- arch/c6x/kernel/dma.c | 9 +- arch/c6x/mm/dma-coherent.c | 4 +- arch/cris/arch-v32/drivers/pci/dma.c | 9 +- arch/frv/mb93090-mb00/pci-dma-nommu.c | 8 +- arch/frv/mb93090-mb00/pci-dma.c | 9 +- arch/h8300/kernel/dma.c | 8 +- arch/hexagon/include/asm/dma-mapping.h | 1 - arch/hexagon/kernel/dma.c | 8 +- arch/ia64/hp/common/sba_iommu.c...

Hello, Did anyone do some work on improving the samba read/write performance? We've got a board attached with an IDE hadisk, running samba 2.0.7 on uClinux(NOMMU) OS, the IDE throughput: 10.5Mbps,ethernet speed: 16Mbps,Samba throughput(copy file from WINDOWS PC to host board ): 600KByte/s,CPU working at 120MHz, system SDRAM 16Mbyte. Could anyone help to figure out where the bottleneck is and how to tune it? Thanks a lot! Happy hacking... hn ______________...

...6_64/kernel/Makefile +++ b/arch/x86_64/kernel/Makefile @@ -8,7 +8,8 @@ obj-y := process.o signal.o entry.o trap ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_x86_64.o \ x8664_ksyms.o i387.o syscall.o vsyscall.o \ setup64.o bootflag.o e820.o reboot.o quirks.o i8237.o \ - pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o sched-clock.o + pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o sched-clock.o \ + bugs.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_X86_MCE) += mce.o therm_throt.o =================================================================== --- /dev/null +++ b...

...6_64/kernel/Makefile +++ b/arch/x86_64/kernel/Makefile @@ -8,7 +8,8 @@ obj-y := process.o signal.o entry.o trap ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_x86_64.o \ x8664_ksyms.o i387.o syscall.o vsyscall.o \ setup64.o bootflag.o e820.o reboot.o quirks.o i8237.o \ - pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o sched-clock.o + pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o sched-clock.o \ + bugs.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_X86_MCE) += mce.o therm_throt.o =================================================================== --- /dev/null +++ b...

...NON_CONSISTENT flag. Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages as its backend. Signed-off-by: Christoph Hellwig <hch at lst.de> --- Documentation/core-api/dma-attributes.rst | 8 --- arch/alpha/kernel/pci_iommu.c | 2 + arch/arm/mm/dma-mapping-nommu.c | 2 + arch/arm/mm/dma-mapping.c | 4 ++ arch/ia64/hp/common/sba_iommu.c | 2 + arch/mips/jazz/jazzdma.c | 7 +-- arch/powerpc/kernel/dma-iommu.c | 2 + arch/powerpc/platforms/ps3/system-bus.c | 4 ++ arch/powerpc/platforms/ps...

...) >> 758 return VM_FAULT_SIGBUS; >> 759 >> 760 return VM_FAULT_NOPAGE; >> 761 } >> 762 > Yes well, all this remapping clearly has no chance to work > on systems without CONFIG_MMU. It looks to me mmap can work according to Documentation/nommu-mmap.txt. But I'm not sure it's worth to bother. Thanks > > >

...) >> 758 return VM_FAULT_SIGBUS; >> 759 >> 760 return VM_FAULT_NOPAGE; >> 761 } >> 762 > Yes well, all this remapping clearly has no chance to work > on systems without CONFIG_MMU. It looks to me mmap can work according to Documentation/nommu-mmap.txt. But I'm not sure it's worth to bother. Thanks > > >

...> arch/c6x/include/asm/dma-mapping.h | 4 +- > arch/c6x/kernel/dma.c | 9 +- > arch/c6x/mm/dma-coherent.c | 4 +- > arch/cris/arch-v32/drivers/pci/dma.c | 9 +- > arch/frv/mb93090-mb00/pci-dma-nommu.c | 8 +- > arch/frv/mb93090-mb00/pci-dma.c | 9 +- > arch/h8300/kernel/dma.c | 8 +- > arch/hexagon/include/asm/dma-mapping.h | 1 - > arch/hexagon/kernel/dma.c | 8 +- > arch/i...

...| 8 +- arch/c6x/include/asm/dma-mapping.h | 4 +- arch/c6x/kernel/dma.c | 9 +- arch/c6x/mm/dma-coherent.c | 4 +- arch/cris/arch-v32/drivers/pci/dma.c | 9 +- arch/frv/mb93090-mb00/pci-dma-nommu.c | 8 +- arch/frv/mb93090-mb00/pci-dma.c | 9 +- arch/h8300/kernel/dma.c | 8 +- arch/hexagon/include/asm/dma-mapping.h | 1 - arch/hexagon/kernel/dma.c | 8 +- arch/ia64/hp/common/sba_iommu.c...

...59 >>>> 760 return VM_FAULT_NOPAGE; >>>> 761 } >>>> 762 >>> Yes well, all this remapping clearly has no chance to work >>> on systems without CONFIG_MMU. >> >> It looks to me mmap can work according to Documentation/nommu-mmap.txt. But >> I'm not sure it's worth to bother. >> >> Thanks > > Well > > int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, > unsigned long pfn, unsigned long size, pgprot_t prot) > { > if (addr != (pfn &...

...59 >>>> 760 return VM_FAULT_NOPAGE; >>>> 761 } >>>> 762 >>> Yes well, all this remapping clearly has no chance to work >>> on systems without CONFIG_MMU. >> >> It looks to me mmap can work according to Documentation/nommu-mmap.txt. But >> I'm not sure it's worth to bother. >> >> Thanks > > Well > > int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, > unsigned long pfn, unsigned long size, pgprot_t prot) > { > if (addr != (pfn &...