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Re: [PATCH v4 02/10] PCI/P2PDMA: Add CONFIG_PCI_P2PDMA_CORE

by Matt Evans

Hi Logan, On 02/07/2026 16:45, Logan Gunthorpe wrote: > > > On 2026-07-01 11:12 a.m., Matt Evans wrote:> >> PCI POWER CONTROL >> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig >> index 33c88432b728..59d70bc84cc9 100644 >> --- a/drivers/pci/Kconfig >> +++ b/drivers/pci/Kconfig >> @@ -206,11 +206,7 @@ config PCIE_TPH >> config PCI_P2PDMA >> bool "PCI peer-to-peer transfer support" >> depends on ZONE_DEVICE >> - # >> - # The need for the scatterlist DMA bus address flag means PCI P2PDMA >> - # requires 64bit >> - # >> - depends on 64BIT >> + select PCI_P2PDMA_CORE > > Can we remove this dependency on 64BIT? Althogh it looks like > af2880ec440 complicated the issue a bit. > > If I remember correctly, the original reason for this is because on > 64bit systems dma_flags fit into unusued space in struct scatterlist and > on 32bit systems this space didn't exist and thus adding the flag > required increasing the size of the structure which wasn't desirable at > the time. > > But af2880ec440 introduced CONFIG_NEED_SG_DMA_FLAGS which doesn't depend > on 64bit which means if CONFIG_IOMMU_DMA and CONFIG_SWIOTLB are now set > on 32bit systems that structure will grow quite a bit. There was some discussion on this aspect of af2880ec440 in the corresponding v3 patch, for example: https://lore.kernel.org/all/feaefa41-9f67-4d4f-a3e0-282dca41f3eb@ozlabs.org/ It seems CONFIG_NEED_SG_DMA_FLAGS doesn't have a hard/functional dependency on 64BIT (and it can be enabled on some !64BIT configs already, despite what the stale comments say). > So maybe at this point it's fine to enable this on 32bit systems and we > can remove this requirement. However, I think we should do that > explicitly in its own patch, not hide it in this refactoring patch. Your question does prove it's too stealthy as-is. :) PCI_P2PDMA still can't be enabled on 32-bit systems because of its ZONE_DEVICE -> MEMORY_HOTPLUG -> 64BIT dependency. So we're not enabling 32-bit support for PCI_P2PDMA here, but it's not obvious and so I'll re-add the `depends on 64BIT`. At least then it won't be enabled without intention if someone enables ZONE_DEVICE on 32-bit systems... Thanks, Matt

9 hours, 55 minutes

Re: [PATCH] rust: device_id: rename IdTable::as_ptr to as_raw_id_table()

by Gary Guo

On Thu Jul 2, 2026 at 1:30 PM BST, Alice Ryhl wrote: > The current name of `as_ptr` is very generic, and if you attempt to > invoke `foo.as_ptr()` on a type for which this method is missing, then > an error along these lines will be printed: > > error[E0599]: no method named `as_ptr` found for reference `&DmaBuf` in the current scope > --> linux/rust/kernel/dma_buf/buf.rs:54:38 > | > 54 | ptr::eq(self.as_ptr(), other.as_ptr()) > | ^^^^^^ method not found in `&DmaBuf` > | > = help: items from traits can only be used if the trait is implemented and in scope > note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it > --> linux/rust/kernel/device_id.rs:165:1 > | > 165 | pub trait IdTable<T: RawDeviceId, U> { > | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Suggesting the IdTable trait when an as_ptr() method is missing is not > useful. Renaming it to `as_raw_id_table` makes the method name unique to > this trait and avoids these bad suggestions. I think the name is fine. Functions of this sort is named `as_ptr()` and I don't see why it should differ just because it's on traits. I'd rather say this is a Rust deficiency. Perhaps there needs to be a improvement of `#[diagnostic::do_not_recommend]` so it can be sticked to methods or traits as well. Best, Gary > > Assisted-by: Antigravity:Gemini > Signed-off-by: Alice Ryhl <aliceryhl(a)google.com> > --- > rust/kernel/auxiliary.rs | 2 +- > rust/kernel/device_id.rs | 4 ++-- > rust/kernel/driver.rs | 8 +++++--- > rust/kernel/i2c.rs | 8 ++++---- > rust/kernel/pci.rs | 2 +- > rust/kernel/platform.rs | 4 ++-- > rust/kernel/usb.rs | 2 +- > 7 files changed, 16 insertions(+), 14 deletions(-)

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