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Enable experimental rust support for ppc64le and ppc32be. The patch for
ppc32 has been provided by Link Mauve[1] and ppc64le support[2] has been
merged over it. ppc32 needs some toolchain fixes mentioned in the patch
`rust: Add PowerPC support` and the discussion for that is done here[1].
This has been tested on
- powernv9 hardware
- pseries P11 hardware
- pseries(9, 10) qemu
- powernv(9, 10) qemu
- rustdoc on x86 and powerpc64le
- rusttest on x86 and powerpc64le
We are actively working with our LLVM team to get the target for ppc,
ppc64 and ppc64le in the rust compiler.
[1] https://lore.kernel.org/all/20260204030507.8203-1-linkmauve@linkmauve.fr
[2] https://lore.kernel.org/all/20260204042417.83903-1-mkchauras@gmail.com
Changelog:
V12 -> V13:
- Added a patch for fixing build issue on ppc32 by Link Mauve
- Added another patch to fix a build issue in dma-buf
- Added another patch to enforce minimum `rustc` version for powerpc
V12: https://lore.kernel.org/all/20260421120958.190430-1-mkchauras@gmail.com/
V11 -> V12:
- Rebased to mainline (rust/Makefile conflict resolved)
V11: https://lore.kernel.org/all/20260417152253.2312961-1-mkchauras@gmail.com/
V10 -> V11:
- Updated `rust/Makefile`
- Not all libraries are move to `rust/host` directory now. Only
proc_macro2, quote and syn are moved
- Special handling for pin init is added. Details in commit
- Removed mkdir for `rust/host`, this is now handled by toolchain.
V10: https://lore.kernel.org/all/20260406200149.3727922-1-mkchauras@gmail.com/
V9 -> V10:
- rust/Makefile updated with review comments from Miguel
- Patch 1/4 updated with commit message and subject
V9: https://lore.kernel.org/all/20260404121610.1956528-1-mkchauras@gmail.com/
V8 -> V9:
- rust/Makefile updated with a directory instead of abspath
V8: https://lore.kernel.org/all/20260403145308.1042622-1-mkchauras@gmail.com/
V7 -> V8:
- rust/Makefile updated to separate host libraries from target
V7: https://lore.kernel.org/all/20260329160254.2592207-1-mkchauras@gmail.com/
Changelog:
V6 -> V7:
- Documentation removed as powerpc is still under development
- Added a fix for race condition in rust/Makefile
V6: https://lore.kernel.org/all/20260210090023.2587534-1-mkchauras@gmail.com
V5 -> V6:
- Added a missing Tested by from Venkat which got missed since V3
- Support is marked as Maintained instead of experimental
V5: https://lore.kernel.org/all/20260210053756.2088302-1-mkchauras@gmail.com
V4 -> V5:
- Removed a nested ifdef from PPC64 for Little endian toolchain
V4: https://lore.kernel.org/all/20260209105456.1551677-1-mkchauras@gmail.com
V3 -> V4:
- Co-developed-by header added in patch 1
V3: https://lore.kernel.org/all/20260205180429.3280657-1-mkchauras@gmail.com
V2 -> V3:
- Splited HAVE_RUST in 2 lines
- BINDGEN_TARGET_powerpc initialized before assigning the same to
BINDGEN_TARGET
V2: https://lore.kernel.org/all/20260204210125.613350-1-mkchauras@gmail.com
V1 -> V2:
- jump label fix for rust has been moved to a separate patch
- PPC32 support has been taken
- rust support has been marked experimental
- target.json dependency has been removed
- HAVE_RUST now depends on CPU_LITTLE_ENDIAN for PPC64
Link Mauve (2):
rust: Make __udivdi3() and __umoddi3() panic
rust: Add PowerPC support
Mukesh Kumar Chaurasiya (IBM) (5):
rust: Fix "multiple candidates for rmeta dependency core" error
dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is
disabled
powerpc/jump_label: adjust inline asm to be consistent
rust/powerpc: Set min rustc version for powerpc
powerpc: Enable Rust for ppc64le
arch/powerpc/Kconfig | 2 ++
arch/powerpc/Makefile | 7 ++++
arch/powerpc/include/asm/jump_label.h | 23 ++++++------
include/linux/dma-resv.h | 2 +-
rust/Makefile | 52 +++++++++++++++++----------
rust/compiler_builtins.rs | 6 ++++
scripts/min-tool-version.sh | 6 +++-
7 files changed, 68 insertions(+), 30 deletions(-)
--
2.53.0
From: Jiri Pirko <jiri(a)nvidia.com>
Confidential computing (CoCo) VMs/guests, such as AMD SEV and Intel TDX,
run with private/encrypted memory which creates a challenge
for devices that do not support DMA to it (no TDISP support).
For kernel-only DMA operations, swiotlb bounce buffering provides a
transparent solution by copying data through shared memory.
However, the only way to get this memory into userspace is via the DMA
API's dma_alloc_pages()/dma_mmap_pages() type interfaces which limits
the use of the memory to a single DMA device, and is incompatible with
pin_user_pages().
These limitations are particularly problematic for the RDMA subsystem
which makes heavy use of pin_user_pages() and expects flexible memory
usage between many different DMA devices.
This patch series enables userspace to explicitly request shared
(decrypted) memory allocations from new dma-buf system_cc_shared heap.
Userspace can mmap this memory and pass the dma-buf fd to other
existing importers such as RDMA or DRM devices to access the
memory. The DMA API is improved to allow the dma heap exporter to DMA
map the shared memory to each importing device.
Based on dma-mapping-for-next e7442a68cd1ee797b585f045d348781e9c0dde0d
Jiri Pirko (2):
dma-mapping: introduce DMA_ATTR_CC_SHARED for shared memory
dma-buf: heaps: system: add system_cc_shared heap for explicitly
shared memory
drivers/dma-buf/heaps/system_heap.c | 103 ++++++++++++++++++++++++++--
include/linux/dma-mapping.h | 10 +++
include/trace/events/dma.h | 3 +-
kernel/dma/direct.h | 14 +++-
kernel/dma/mapping.c | 13 +++-
5 files changed, 132 insertions(+), 11 deletions(-)
--
2.51.1
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
sure this builds:
https://gitlab.freedesktop.org/lyudess/linux/-/commits/rust/gem-shmem
This patch series applies on top of drm-rust-next
Lyude Paul (5):
rust: drm: gem: s/device::Device/Device/ for shmem.rs
drm/gem/shmem: Introduce __drm_gem_shmem_free_sgt_locked()
drm/gem/shmem: Export drm_gem_shmem_get_pages_sgt_locked()
rust: drm: gem: Introduce shmem::SGTable
rust: drm: gem: Add vmap functions to shmem bindings
drivers/gpu/drm/drm_gem_shmem_helper.c | 48 ++-
include/drm/drm_gem_shmem_helper.h | 2 +
rust/kernel/drm/gem/shmem.rs | 557 ++++++++++++++++++++++++-
3 files changed, 593 insertions(+), 14 deletions(-)
base-commit: a7a080bb4236ebe577b6776d940d1717912ff6dd
--
2.53.0
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