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On Wed, Jun 10, 2026 at 04:43:16PM +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 | 137 ++++++++++++++++++++++++++---
> drivers/vfio/pci/vfio_pci_priv.h | 20 +++++
> 2 files changed, 144 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c
> index c16f460c01d6..9e5e865f6fb6 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 +93,130 @@ 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 address,
Nit: s/address/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:
> + * - The page would cross the edge of the VMA
> + * - The page isn't entirely contained within a range
> + * - We find a range, but the final PFN isn't aligned to the
> + * requested order.
> + *
> + * (Upon failure, the caller is expected to try again with a
> + * smaller order; the tests above will always succeed for
> + * order=0 as the limit case.)
> + *
> + * It's suboptimal if DMABUFs are created with neigbouring
> + * ranges that are physically contiguous, since hugepages
> + * can't straddle range boundaries. (The construction of the
> + * ranges vector should merge such ranges.)
> + *
> + * Finally, vma_pgoff_adjust is used for a DMABUF representing
> + * a VFIO BAR mmap, which is created from the start of the
> + * offset region.
> + */
> +
> + const unsigned long pagesize = PAGE_SIZE << order;
> + unsigned long vma_off = ((vma->vm_pgoff - priv->vma_pgoff_adjust) <<
> + PAGE_SHIFT) & VFIO_PCI_OFFSET_MASK;
> + unsigned long rounded_page_addr = ALIGN_DOWN(address, pagesize);
> + unsigned long rounded_page_end = rounded_page_addr + pagesize;
> + unsigned long page_buf_offset;
> + unsigned long page_buf_offset_end;
> + unsigned long range_buf_offset = 0;
> + unsigned int i;
> +
> + if (rounded_page_addr < vma->vm_start || rounded_page_end > vma->vm_end) {
> + if (order > 0)
> + return -EAGAIN;
> +
> + /* A fault address outside of the VMA is absurd. */
> + WARN(1, "Fault addr 0x%lx outside VMA 0x%lx-0x%lx\n",
> + address, vma->vm_start, vma->vm_end);
This could flood dmesg if triggered repeatedly by userspace :(
Since a fault outside the VMA is an invalid access that already results
in a SIGBUS, we could probably avoid the WARN here?
Perhaps pr_warn_ratelimited() should suffice?
> + return -EFAULT;
> + }
> +
> + /*
> + * page_buff_offset[_end] is the span of DMABUF offsets
> + * corresponding to the faulting page:
> + */
> + if (unlikely(check_add_overflow(rounded_page_addr - vma->vm_start,
> + vma_off, &page_buf_offset) ||
> + check_add_overflow(page_buf_offset, pagesize,
> + &page_buf_offset_end)))
> + return -EFAULT;
> +
> + for (i = 0; i < priv->nr_ranges; i++) {
> + size_t range_len = priv->phys_vec[i].len;
> + phys_addr_t range_start = priv->phys_vec[i].paddr;
> +
> + /*
> + * If the current range starts after the page's span,
> + * this and any future range won't match. Bail early.
> + */
> + if (page_buf_offset_end <= range_buf_offset)
> + break;
> +
> + if (page_buf_offset >= range_buf_offset &&
> + page_buf_offset_end <= range_buf_offset + range_len) {
> + /*
> + * The faulting page is wholly contained
> + * within the span represented by the range.
> + * Validate PFN alignment for the order:
> + */
> + unsigned long pfn = (range_start + page_buf_offset -
> + range_buf_offset) / PAGE_SIZE;
Minor nit: I'm aware that decent compilers convert pow(2) divides to >>
However, we seem to be using `>> PAGE_SHIFT` across vfio-pci. E.g.:
return (pci_resource_start(vdev->pdev, index) >> PAGE_SHIFT) + pgoff;
unsigned long pgoff = (addr - vma->vm_start) >> PAGE_SHIFT;
Let's consider using the same pattern?
> +
> + if (IS_ALIGNED(pfn, 1 << order)) {
> + *out_pfn = pfn;
> + return 0;
> + }
> + /* Retry with smaller order */
> + return -EAGAIN;
> + }
> + range_buf_offset += range_len;
> + }
> +
> + /*
> + * A hugepage straddling a range boundary will fail to match a
> + * range, but the address will (eventually) match when retried
> + * with a smaller page.
> + */
> + if (order > 0)
> + return -EAGAIN;
> +
> + /*
> + * If we get here, the address fell outside of the span
> + * represented by the (concatenated) ranges. Setup of a
Nit: double space before "Setup" and "But" below.
> + * mapping must ensure that the VMA is <= the total size of
> + * the ranges, so this should never happen. But, if it does,
> + * force SIGBUS for the access and warn.
> + */
> + WARN_ONCE(1, "No range for addr 0x%lx, order %d: VMA 0x%lx-0x%lx pgoff 0x%lx, %u ranges, size 0x%zx\n",
> + address, order, vma->vm_start, vma->vm_end, vma->vm_pgoff,
> + priv->nr_ranges, priv->size);
> +
> + return -EFAULT;
The fall-through logic at the end feels a bit redundant.
If we've exhausted the phys_vec list without finding a match, returning
-EAGAIN for order > 0 seems like the correct fallback behavior.
However, the subsequent WARN_ONCE for the order == 0 seems unnecessary?
An out-of-bounds access is an error that should simply return -EFAULT
(converting to SIGBUS) without polluting the kernel log with stackdumps?
Can we instead convert this to a pr_warn or something? Something like:
ret = order ? -EAGAIN : -EFAULT;
if (ret == -EFAULT)
pr_warn_ratelimited("No range for addr 0x%lx...\n", address);
return ret;
(with appropriate comments)
Thanks,
Praan
On Wed, Jun 10, 2026 at 04:43:15PM +0100, Matt Evans wrote:
> The P2PDMA code currently provides two features under the same
> CONFIG_PCI_P2PDMA option:
>
> 1. Locate providers via pcim_p2pdma_provider()
> 2. Manage actual P2P DMA
>
> Some drivers (such as vfio-pci) depend on 1, without having a hard
> dependency on 2.
>
> A future commit expands the use of DMABUF in vfio-pci for non-P2P
> scenarios, relying on pcim_p2pdma_provider() always being present. If
> that depended on CONFIG_PCI_P2PDMA, it would make vfio-pci only
> available if CONFIG_ZONE_DEVICE is present (e.g. 64-bit systems), even
> when P2P is not needed.
>
> To resolve this, introduce CONFIG_PCI_P2PDMA_CORE and refactor the
> basic provider functionality into a new p2pdma_core.c file. This is
> available even if the CONFIG_PCI_P2PDMA feature is disabled (or
> unavailable due to !CONFIG_ZONE_DEVICE). Then, drivers can enable any
> additional P2P features with the original CONFIG_PCI_P2PDMA (available
> when CONFIG_ZONE_DEVICE is set).
>
> Signed-off-by: Matt Evans <matt(a)ozlabs.org>
> ---
> MAINTAINERS | 2 +-
> drivers/pci/Kconfig | 10 ++--
> drivers/pci/Makefile | 1 +
> drivers/pci/p2pdma.c | 109 ++--------------------------------
> drivers/pci/p2pdma.h | 29 +++++++++
> drivers/pci/p2pdma_core.c | 118 +++++++++++++++++++++++++++++++++++++
> include/linux/pci-p2pdma.h | 24 ++++----
> include/linux/pci.h | 2 +-
> 8 files changed, 174 insertions(+), 121 deletions(-)
> create mode 100644 drivers/pci/p2pdma.h
> create mode 100644 drivers/pci/p2pdma_core.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c2c6d79275c6..b21523b3bd8b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -20617,7 +20617,7 @@ B: https://bugzilla.kernel.org
> C: irc://irc.oftc.net/linux-pci
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git
> F: Documentation/driver-api/pci/p2pdma.rst
> -F: drivers/pci/p2pdma.c
> +F: drivers/pci/p2pdma*
> F: include/linux/pci-p2pdma.h
>
> 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
> select GENERIC_ALLOCATOR
> select NEED_SG_DMA_FLAGS
> help
Nit: Did we drop depends on 64BIT intentionally here? I guess the full
PCI_P2PDMA stack still selects NEED_SG_DMA_FLAGS? IIRC, NEED_SG_DMA_FLAGS
doesn't select 64BIT?
With the nit (and Bjorn's comments addressed)
Reviewed-by: Pranjal Shrivastava <praan(a)google.com>
Thanks,
Praan
Most of this patch series has already been pushed upstream, this is just
the second half of the patch series that has not been pushed yet + some
additional changes which were required to implement changes requested by
the mailing list. This patch series is originally from Asahi, previously
posted by Daniel Almeida.
The previous version of the patch series can be found here:
https://patchwork.freedesktop.org/series/164580/
Branch with patches applied available here:
https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem
This patch series applies on top of drm-rust-next
Patch-series wide changes since V15:
* Fix some major rebasing errors I somehow didn't notice :(
* Drop the dependency on LazyInit, use the trick that Alice suggested
instead.
* Fix dependency ordering so that Tyr can get the vmap stuff first
without the other bits.
Patch-series wide changes since V16:
* Fix ordering one more time (SetOnce::reset() doesn't need to come
before adding vmap functions)
* Rebase against the latest DeviceContext changes from me that got
pushed.
Patch-series wide changes since V20:
* Lots of Sashiko fixes, excluding the comments that I couldn't prove
weren't just bogus.
Lyude Paul (4):
rust: drm: gem: shmem: Add DmaResvGuard helper
rust: drm: gem: shmem: Add vmap functions
rust: faux: Allow retrieving a bound Device
rust: drm: gem: Introduce shmem::Object::sg_table()
rust/kernel/drm/gem/shmem.rs | 546 ++++++++++++++++++++++++++++++++++-
rust/kernel/faux.rs | 16 +-
2 files changed, 546 insertions(+), 16 deletions(-)
base-commit: 848bf57e98e1678ce7a49eb4e0bf0502da95dc07
--
2.54.0
On Wed, Jun 10, 2026 at 04:43:15PM +0100, Matt Evans wrote:
> The P2PDMA code currently provides two features under the same
> CONFIG_PCI_P2PDMA option:
>
> 1. Locate providers via pcim_p2pdma_provider()
> 2. Manage actual P2P DMA
>
> Some drivers (such as vfio-pci) depend on 1, without having a hard
> dependency on 2.
>
> A future commit expands the use of DMABUF in vfio-pci for non-P2P
> scenarios, relying on pcim_p2pdma_provider() always being present. If
> that depended on CONFIG_PCI_P2PDMA, it would make vfio-pci only
> available if CONFIG_ZONE_DEVICE is present (e.g. 64-bit systems), even
> when P2P is not needed.
>
> To resolve this, introduce CONFIG_PCI_P2PDMA_CORE and refactor the
> basic provider functionality into a new p2pdma_core.c file. This is
> available even if the CONFIG_PCI_P2PDMA feature is disabled (or
> unavailable due to !CONFIG_ZONE_DEVICE). Then, drivers can enable any
> additional P2P features with the original CONFIG_PCI_P2PDMA (available
> when CONFIG_ZONE_DEVICE is set).
>
> Signed-off-by: Matt Evans <matt(a)ozlabs.org>
I thought this was going to be just a code move and new Kconfig
option, but it involves a little more than that, e.g., adding
pci_p2pdma_release_pool() and tweaking the RCU synchronization.
If possible, it would be nice to do that refactoring in a smaller
preliminary patch so it's easier to review/bisect/etc and make this
one a pure code move.
I guess CONFIG_PCI_P2PDMA_CORE selects just part 1 ("Locate providers
via pcim_p2pdma_provider()"), right?
> +++ b/drivers/pci/p2pdma.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * PCI Peer 2 Peer DMA support.
> + */
> +
> +#ifndef _PCI_P2PDMA_H
> +#define _PCI_P2PDMA_H
> +
> +#include <linux/genalloc.h>
> +#include <linux/pci-p2pdma.h>
> +#include <linux/xarray.h>
> +
> +struct pci_p2pdma {
> + struct gen_pool *pool;
> + bool p2pmem_published;
> + struct xarray map_types;
> + struct p2pdma_provider mem[PCI_STD_NUM_BARS];
> +};
> +
> +#ifdef CONFIG_PCI_P2PDMA
> +void pci_p2pdma_release_pool(struct pci_dev *pdev, struct pci_p2pdma *p2pdma);
> +#else
> +static inline void pci_p2pdma_release_pool(struct pci_dev *pdev, struct pci_p2pdma *p2pdma)
Wrap to fit in 80 columns like the rest of drivers/pci/
> +{
> +}
> +#endif
> +
> +#endif
> +
Spurious blank line at end.
> +++ b/drivers/pci/p2pdma_core.c
> @@ -0,0 +1,118 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCI Peer 2 Peer DMA support core, providing a bare-bones
In this English text, I think I would spell out "Peer to Peer" instead
of relying on the "2" homophone. Same in p2pdma.h.
Hi Jiri,
On Thu, 11 Jun 2026 at 15:51, Jiri Pirko <jiri(a)resnulli.us> wrote:
>
> Wed, Jun 10, 2026 at 04:23:29PM +0200, sumit.semwal(a)linaro.org wrote:
> >From: Arnd Bergmann <arnd(a)arndb.de>
> >
> >While system heap and system_cc_shared heap share a lot of code
> >and hence the same source file, their users have different needs.
> >
> >system heap users need it to be a loadable module, while
> >system_cc_shared heap users don't.
> >
> >Building as a loadable module breaks system_cc_shared heap on
> >powerpc and s390 due to un-exported set_memory_encrypted /
> >set_memory_decrypted functions.
> >
> >Fix these by reorganising code to put the system_cc_shared heap
> >under a new Kconfig symbol, which allows either building both
> >into the kernel, or leave encryption up to the consumers of the
> >system heap.
> >
> >Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module")
> >Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
> >Signed-off-by: Sumit Semwal <sumit.semwal(a)linaro.org>
> >---
> > drivers/dma-buf/heaps/Kconfig | 8 ++++++++
> > drivers/dma-buf/heaps/system_heap.c | 16 ++++++++++------
> > 2 files changed, 18 insertions(+), 6 deletions(-)
> >
> >diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig
> >index e273fb18feca..a39decdcf067 100644
> >--- a/drivers/dma-buf/heaps/Kconfig
> >+++ b/drivers/dma-buf/heaps/Kconfig
> >@@ -5,6 +5,14 @@ config DMABUF_HEAPS_SYSTEM
> > Choose this option to enable the system dmabuf heap. The system heap
> > is backed by pages from the buddy allocator. If in doubt, say Y.
> >
> >+config DMABUF_HEAPS_CC_SYSTEM
>
> Nit: "DMABUF_HEAPS_SYSTEM_CC_SHARED" to be consistent with the heap
> name?
>
> With or without it:
> Reviewed-by: Jiri Pirko <jiri(a)nvidia.com>
>
Thanks for catching this; I'll fix this while pushing to
drm-misc-next-fixes in a few minutes.
Best,
Sumit.
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