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5 days, 1 hour

Re: [PATCH] drm: docs: Remove item from TODO list

by Maxime Ripard

Hi, On Mon, Oct 23, 2023 at 10:25:50AM -0700, Doug Anderson wrote: > On Mon, Oct 23, 2023 at 9:31 AM Yuran Pereira <yuran.pereira(a)hotmail.com> wrote: > > > > Since "Clean up checks for already prepared/enabled in panels" has > > already been done and merged [1], I think there is no longer a need > > for this item to be in the gpu TODO. > > > > [1] https://patchwork.freedesktop.org/patch/551421/ > > > > Signed-off-by: Yuran Pereira <yuran.pereira(a)hotmail.com> > > --- > > Documentation/gpu/todo.rst | 25 ------------------------- > > 1 file changed, 25 deletions(-) > > It's not actually all done. It's in a bit of a limbo state right now, > unfortunately. I landed all of the "simple" cases where panels were > needlessly tracking prepare/enable, but the less simple cases are > still outstanding. > > Specifically the issue is that many panels have code to properly power > cycle themselves off at shutdown time and in order to do that they > need to keep track of the prepare/enable state. After a big, long > discussion [1] it was decided that we could get rid of all the panel > code handling shutdown if only all relevant DRM KMS drivers would > properly call drm_atomic_helper_shutdown(). > > I made an attempt to get DRM KMS drivers to call > drm_atomic_helper_shutdown() [2] [3] [4]. I was able to land the > patches that went through drm-misc, but currently many of the > non-drm-misc ones are blocked waiting for attention. > > ...so things that could be done to help out: > > a) Could review patches that haven't landed in [4]. Maybe adding a > Reviewed-by tag would help wake up maintainers? > > b) Could see if you can identify panels that are exclusively used w/ > DRM drivers that have already been converted and then we could post > patches for just those panels. I have no idea how easy this task would > be. Is it enough to look at upstream dts files by "compatible" string? I think it is, yes. Maxime

5 days, 3 hours

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by graceful.earthworm.hsos＠hidingmail.com

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5 days, 3 hours

Re: [PATCH v5 3/9] vfio/pci: Add a helper to look up PFNs for DMABUFs

by Matt Evans

Hi Praan, On 30/07/2026 23:55, Pranjal Shrivastava wrote: > On Wed, Jul 15, 2026 at 06:47:26PM +0100, Matt Evans wrote: >> Add vfio_pci_dma_buf_find_pfn(), which a VMA fault handler can use to >> find a PFN. >> >> This supports multi-range DMABUFs, which typically would be used to >> represent scattered spans but might even represent overlapping or >> aliasing spans of PFNs. >> >> Because this is intended to be used in vfio_pci_core.c, we also need >> to expose the struct vfio_pci_dma_buf in the vfio_pci_priv.h header. >> >> Signed-off-by: Matt Evans <matt(a)ozlabs.org> >> --- >> drivers/vfio/pci/vfio_pci_dmabuf.c | 153 ++++++++++++++++++++++++++--- >> drivers/vfio/pci/vfio_pci_priv.h | 20 ++++ >> 2 files changed, 160 insertions(+), 13 deletions(-) >> >> diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c >> index c16f460c01d6..7c047400dfd1 100644 >> --- a/drivers/vfio/pci/vfio_pci_dmabuf.c >> +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c >> @@ -9,19 +9,6 @@ >> >> MODULE_IMPORT_NS("DMA_BUF"); >> >> -struct vfio_pci_dma_buf { >> - struct dma_buf *dmabuf; >> - struct vfio_pci_core_device *vdev; >> - struct list_head dmabufs_elm; >> - size_t size; >> - struct phys_vec *phys_vec; >> - struct p2pdma_provider *provider; >> - u32 nr_ranges; >> - struct kref kref; >> - struct completion comp; >> - u8 revoked : 1; >> -}; >> - >> static int vfio_pci_dma_buf_attach(struct dma_buf *dmabuf, >> struct dma_buf_attachment *attachment) >> { >> @@ -106,6 +93,146 @@ static const struct dma_buf_ops vfio_pci_dmabuf_ops = { >> .release = vfio_pci_dma_buf_release, >> }; >> >> +int vfio_pci_dma_buf_find_pfn(struct vfio_pci_dma_buf *priv, >> + struct vm_area_struct *vma, >> + unsigned long fault_addr, >> + unsigned int order, >> + unsigned long *out_pfn) >> +{ >> + /* >> + * Given a VMA (start, end, pgoffs) and a fault address, >> + * search the corresponding DMABUF's phys_vec[] to find the >> + * range representing the address's offset into the VMA, and >> + * its PFN. >> + * >> + * The phys_vec[] ranges represent contiguous spans of VAs >> + * upwards from the buffer offset 0; the actual PFNs might be >> + * in any order, overlap/alias, etc. Calculate an offset of >> + * the desired page given VMA start/pgoff and address, then >> + * search upwards from 0 to find which span contains it. >> + * >> + * On success, a valid PFN for a page sized by 'order' is >> + * returned into out_pfn. >> + * >> + * Failure occurs if: >> + * - A hugepage would cross the edge of the VMA, >> + * - A hugepage isn't entirely contained within a range >> + * (including where it straddles the boundary between >> + * ranges), >> + * - We find a range, but the final PFN isn't aligned to the >> + * requested order. >> + * >> + * Upon failure, -EAGAIN is returned and the caller is >> + * expected to try again with a smaller order, which will >> + * eventually succeed (order=0 will always work). >> + * >> + * It's suboptimal if DMABUFs are created with neighbouring >> + * ranges that are physically contiguous, since hugepages >> + * can't straddle range boundaries. (The construction of the >> + * ranges should merge them in this case.) >> + * >> + * Finally, vma_pgoff_adjust is used with a DMABUF created for >> + * a VFIO BAR mmap: a BAR mapped with vm_pgoff > 0 creates a >> + * DMABUF such that byte 0 of the VMA corresponds to byte 0 of >> + * the DMABUF and byte 'vm_pgoff << PAGE_SHIFT' into the BAR. >> + * To avoid double-offsetting in this scenario, subtracting >> + * vma_pgoff_adjust from this (non-zero) vm_pgoff generates >> + * the effective offset. >> + */ >> + >> + const unsigned long pagesize = PAGE_SIZE << order; >> + unsigned long vma_off = ((vma->vm_pgoff - priv->vma_pgoff_adjust) << >> + PAGE_SHIFT) & VFIO_PCI_OFFSET_MASK; > > Maybe I'm getting ahead of myself here.. but it seems like this > restricts us to only mapping DMABUFs at offsets < 1TB due to the > VFIO_PCI_OFFSET_MASK (since we have HBMs on PCI devices now, hitting 1TB > may not be a very distant future). This is a really good question, thanks for raisiing it. It is not too forward-thinking at all. > While I understand this mask is needed to drop the BAR encoding in the > high bits. > > My worry is, if in the future a user were to export a massive > contiguous DMABUF (e.g., >1TB of aggregated HBM) and tried to mmap deep > into it (passing an offset >= 1TB), this bitwise AND would silently drop > the high bits, leading to silent data corruption. One of the big advantages of DMABUF export was that the range could be huge and unencumbered by the VFIO_PCI_OFFSET_SHIFT of the traditional mmap() interface. It's a way to mmap huge BARs without having to change the user-visible shift). So definitely this is a relevant concern. > I think we should explicitly reject such an mmap with -EINVAL like: > > +const unsigned long pagesize = PAGE_SIZE << order; > +unsigned long vma_off = (vma->vm_pgoff - priv->vma_pgoff_adjust) << PAGE_SHIFT; > > +/* > + * Prevent silent wrap-around if the user mmaps a DMABUF at an > + * offset greater than the VFIO index mask allows. > + */ > +if (unlikely(vma_off > VFIO_PCI_OFFSET_MASK)) > + return -EINVAL; > > +vma_off &= VFIO_PCI_OFFSET_MASK; Agreed, for now this absolutely should not silently wrap if the offset is > 1TB, and we live with the restriction that a DMABUF sized >1TB can't be mapped with such an offset. (We can still, say, map all of a 16TB DMABUF with offset=0, which is good.). I'll add a check, thanks for pointing this out. I suggest as something to revisit later, we flag for a DMABUF (maybe an evolution of vma_pgoff_adjust) to differentiate whether this masking needs to be applied (traditional mmap() path) or not (DMABUF mmap()), and then offsets can be arbitrarily large. Cheers, Matt >> + unsigned long rounded_page_addr = ALIGN_DOWN(fault_addr, pagesize); >> + unsigned long rounded_page_end = rounded_page_addr + pagesize; >> + unsigned long fault_offset; >> + unsigned long fault_offset_end; >> + unsigned long range_start_offset = 0; >> + unsigned int i; >> + int ret; >> + > > > Thanks, > Praan

5 days, 5 hours

Re: [PATCH v5 11/16] nvme-pci: add SGL support for the dmabuf path

by Christoph Hellwig

Looks good: Reviewed-by: Christoph Hellwig <hch(a)lst.de>

5 days, 14 hours

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