| Message ID | alpine.DEB.2.21.2005201628330.27502@sstabellini-ThinkPad-T480s (mailing list archive) |
|---|---|
| Headers | show |
| Series | fix swiotlb-xen for RPi4 | expand |
On Wed, May 20, 2020 at 4:45 PM Stefano Stabellini <sstabellini@kernel.org> wrote: > > Hi all, > > This series is a collection of fixes to get Linux running on the RPi4 as > dom0. > > Conceptually there are only two significant changes: > > - make sure not to call virt_to_page on vmalloc virt addresses (patch > #1) > - use phys_to_dma and dma_to_phys to translate phys to/from dma > addresses (all other patches) > > In particular in regards to the second part, the RPi4 is the first > board where Xen can run that has the property that dma addresses are > different from physical addresses, and swiotlb-xen was written with the > assumption that phys addr == dma addr. > > This series adds the phys_to_dma and dma_to_phys calls to make it work. Great to see this! Stefano, any chance you can put it in a branch some place so I can test the final version? Thanks, Roman.
On Wed, 20 May 2020, Roman Shaposhnik wrote: > On Wed, May 20, 2020 at 4:45 PM Stefano Stabellini > <sstabellini@kernel.org> wrote: > > > > Hi all, > > > > This series is a collection of fixes to get Linux running on the RPi4 as > > dom0. > > > > Conceptually there are only two significant changes: > > > > - make sure not to call virt_to_page on vmalloc virt addresses (patch > > #1) > > - use phys_to_dma and dma_to_phys to translate phys to/from dma > > addresses (all other patches) > > > > In particular in regards to the second part, the RPi4 is the first > > board where Xen can run that has the property that dma addresses are > > different from physical addresses, and swiotlb-xen was written with the > > assumption that phys addr == dma addr. > > > > This series adds the phys_to_dma and dma_to_phys calls to make it work. > > Great to see this! Stefano, any chance you can put it in a branch some place > so I can test the final version? Here it is, but keep in mind that it is based on Linux master (because it is meant to go upstream): git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git fix-rip4-v1
I would like to ask the maintainers, Juergen, Boris, Konrad, whether you have any more feedback before I send v2 of the series. Cheers, Stefano On Wed, 20 May 2020, Stefano Stabellini wrote: > Hi all, > > This series is a collection of fixes to get Linux running on the RPi4 as > dom0. > > Conceptually there are only two significant changes: > > - make sure not to call virt_to_page on vmalloc virt addresses (patch > #1) > - use phys_to_dma and dma_to_phys to translate phys to/from dma > addresses (all other patches) > > In particular in regards to the second part, the RPi4 is the first > board where Xen can run that has the property that dma addresses are > different from physical addresses, and swiotlb-xen was written with the > assumption that phys addr == dma addr. > > This series adds the phys_to_dma and dma_to_phys calls to make it work. > > > Cheers, > > Stefano >
On 6/2/20 5:51 PM, Stefano Stabellini wrote: > I would like to ask the maintainers, Juergen, Boris, Konrad, whether you > have any more feedback before I send v2 of the series. I think I only had one comment and that's all. Most were from Julien. -boris > > Cheers, > > Stefano > > > On Wed, 20 May 2020, Stefano Stabellini wrote: >> Hi all, >> >> This series is a collection of fixes to get Linux running on the RPi4 as >> dom0. >> >> Conceptually there are only two significant changes: >> >> - make sure not to call virt_to_page on vmalloc virt addresses (patch >> #1) >> - use phys_to_dma and dma_to_phys to translate phys to/from dma >> addresses (all other patches) >> >> In particular in regards to the second part, the RPi4 is the first >> board where Xen can run that has the property that dma addresses are >> different from physical addresses, and swiotlb-xen was written with the >> assumption that phys addr == dma addr. >> >> This series adds the phys_to_dma and dma_to_phys calls to make it work. >> >> >> Cheers, >> >> Stefano >>