blaster4385/linux-IllusionX/arch/parisc/include, branch v6.12.1

mm: refactor arch_calc_vm_flag_bits() and arm64 MTE handling

2024-11-06T00:49:55Z

Currently MTE is permitted in two circumstances (desiring to use MTE having been specified by the VM_MTE flag) - where MAP_ANONYMOUS is specified, as checked by arch_calc_vm_flag_bits() and actualised by setting the VM_MTE_ALLOWED flag, or if the file backing the mapping is shmem, in which case we set VM_MTE_ALLOWED in shmem_mmap() when the mmap hook is activated in mmap_region(). The function that checks that, if VM_MTE is set, VM_MTE_ALLOWED is also set is the arm64 implementation of arch_validate_flags(). Unfortunately, we intend to refactor mmap_region() to perform this check earlier, meaning that in the case of a shmem backing we will not have invoked shmem_mmap() yet, causing the mapping to fail spuriously. It is inappropriate to set this architecture-specific flag in general mm code anyway, so a sensible resolution of this issue is to instead move the check somewhere else. We resolve this by setting VM_MTE_ALLOWED much earlier in do_mmap(), via the arch_calc_vm_flag_bits() call. This is an appropriate place to do this as we already check for the MAP_ANONYMOUS case here, and the shmem file case is simply a variant of the same idea - we permit RAM-backed memory. This requires a modification to the arch_calc_vm_flag_bits() signature to pass in a pointer to the struct file associated with the mapping, however this is not too egregious as this is only used by two architectures anyway - arm64 and parisc. So this patch performs this adjustment and removes the unnecessary assignment of VM_MTE_ALLOWED in shmem_mmap(). [akpm@linux-foundation.org: fix whitespace, per Catalin] Link: https://lkml.kernel.org/r/ec251b20ba1964fb64cf1607d2ad80c47f3873df.1730224667.git.lorenzo.stoakes@oracle.com Fixes: deb0f6562884 ("mm/mmap: undo ->mmap() when arch_validate_flags() fails") Signed-off-by: Lorenzo Stoakes Suggested-by: Catalin Marinas Reported-by: Jann Horn Reviewed-by: Catalin Marinas Reviewed-by: Vlastimil Babka Cc: Andreas Larsson Cc: David S. Miller Cc: Helge Deller Cc: James E.J. Bottomley Cc: Liam R. Howlett Cc: Linus Torvalds Cc: Mark Brown Cc: Peter Xu Cc: Will Deacon Cc: Signed-off-by: Andrew Morton

parisc: get rid of private asm/unaligned.h

2024-10-02T03:20:41Z

Declarations local to arch/*/kernel/*.c are better off *not* in a public header - arch/parisc/kernel/unaligned.h is just fine for those bits. With that done parisc asm/unaligned.h is reduced to include of asm-generic/unaligned.h and can be removed - unaligned.h is in mandatory-y in include/asm-generic/Kbuild. Acked-by: Helge Deller Signed-off-by: Al Viro

Merge tag 'parisc-for-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2024-09-19T05:43:13Z

Pull parisc architecture updates from Helge Deller: - On parisc we now use the generic clockevent framework for timekeeping - Although there is no 64-bit glibc/userspace for parisc yet, for testing purposes one can run statically linked 64-bit binaries. This patchset contains two patches which fix 64-bit userspace which has been broken since kernel 4.19 - Fix the userspace stack position and size when the ADDR_NO_RANDOMIZE personality is enabled - On other architectures mmap(MAP_GROWSDOWN | MAP_STACK) creates a downward-growing stack. On parisc mmap(MAP_STACK) is now sufficient to create an upward-growing stack * tag 'parisc-for-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Allow mmap(MAP_STACK) memory to automatically expand upwards parisc: Use PRIV_USER instead of hardcoded value parisc: Fix itlb miss handler for 64-bit programs parisc: Fix 64-bit userspace syscall path parisc: Fix stack start for ADDR_NO_RANDOMIZE personality parisc: Convert to generic clockevents parisc: pdc_stable: Constify struct kobj_type

parisc: Allow mmap(MAP_STACK) memory to automatically expand upwards

2024-09-16T21:01:43Z

When userspace allocates memory with mmap() in order to be used for stack, allow this memory region to automatically expand upwards up until the current maximum process stack size. The fault handler checks if the VM_GROWSUP bit is set in the vm_flags field of a memory area before it allows it to expand. This patch modifies the parisc specific code only. A RFC for a generic patch to modify mmap() for all architectures was sent to the mailing list but did not get enough Acks. Reported-by: Camm Maguire Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # v5.10+

net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags

2024-09-12T03:44:32Z

Add an interface for the user to notify the kernel that it is done reading the devmem dmabuf frags returned as cmsg. The kernel will drop the reference on the frags to make them available for reuse. Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry Reviewed-by: Pavel Begunkov Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20240910171458.219195-11-almasrymina@google.com Signed-off-by: Jakub Kicinski

tcp: RX path for devmem TCP

2024-09-12T03:44:32Z

In tcp_recvmsg_locked(), detect if the skb being received by the user is a devmem skb. In this case - if the user provided the MSG_SOCK_DEVMEM flag - pass it to tcp_recvmsg_devmem() for custom handling. tcp_recvmsg_devmem() copies any data in the skb header to the linear buffer, and returns a cmsg to the user indicating the number of bytes returned in the linear buffer. tcp_recvmsg_devmem() then loops over the unaccessible devmem skb frags, and returns to the user a cmsg_devmem indicating the location of the data in the dmabuf device memory. cmsg_devmem contains this information: 1. the offset into the dmabuf where the payload starts. 'frag_offset'. 2. the size of the frag. 'frag_size'. 3. an opaque token 'frag_token' to return to the kernel when the buffer is to be released. The pages awaiting freeing are stored in the newly added sk->sk_user_frags, and each page passed to userspace is get_page()'d. This reference is dropped once the userspace indicates that it is done reading this page. All pages are released when the socket is destroyed. Signed-off-by: Willem de Bruijn Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry Reviewed-by: Pavel Begunkov Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20240910171458.219195-10-almasrymina@google.com Signed-off-by: Jakub Kicinski

parisc: Convert to generic clockevents

2024-09-09T06:53:17Z

Convert parisc timer code to generic clockevents framework. Signed-off-by: Helge Deller

parisc: fix a possible DMA corruption

2024-07-29T14:19:07Z

ARCH_DMA_MINALIGN was defined as 16 - this is too small - it may be possible that two unrelated 16-byte allocations share a cache line. If one of these allocations is written using DMA and the other is written using cached write, the value that was written with DMA may be corrupted. This commit changes ARCH_DMA_MINALIGN to be 128 on PA20 and 32 on PA1.1 - that's the largest possible cache line size. As different parisc microarchitectures have different cache line size, we define arch_slab_minalign(), cache_line_size() and dma_get_cache_alignment() so that the kernel may tune slab cache parameters dynamically, based on the detected cache line size. Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org Signed-off-by: Helge Deller

Merge tag 'parisc-for-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2024-07-25T19:37:42Z

Pull parisc updates from Helge Deller: "The gettimeofday() and clock_gettime() syscalls are now available as vDSO functions, and Dave added a patch which allows to use NVMe cards in the PCI slots as fast and easy alternative to SCSI discs. Summary: - add gettimeofday() and clock_gettime() vDSO functions - enable PCI_MSI_ARCH_FALLBACKS to allow PCI to PCIe bridge adaptor with PCIe NVME card to function in parisc machines - allow users to reduce kernel unaligned runtime warnings - minor code cleanups" * tag 'parisc-for-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Add support for CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN parisc: Use max() to calculate parisc_tlb_flush_threshold parisc: Fix warning at drivers/pci/msi/msi.h:121 parisc: Add 64-bit gettimeofday() and clock_gettime() vDSO functions parisc: Add 32-bit gettimeofday() and clock_gettime() vDSO functions parisc: Clean up unistd.h file

Merge tag 'driver-core-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2024-07-25T17:42:22Z

Pull driver core updates from Greg KH: "Here is the big set of driver core changes for 6.11-rc1. Lots of stuff in here, with not a huge diffstat, but apis are evolving which required lots of files to be touched. Highlights of the changes in here are: - platform remove callback api final fixups (Uwe took many releases to get here, finally!) - Rust bindings for basic firmware apis and initial driver-core interactions. It's not all that useful for a "write a whole driver in rust" type of thing, but the firmware bindings do help out the phy rust drivers, and the driver core bindings give a solid base on which others can start their work. There is still a long way to go here before we have a multitude of rust drivers being added, but it's a great first step. - driver core const api changes. This reached across all bus types, and there are some fix-ups for some not-common bus types that linux-next and 0-day testing shook out. This work is being done to help make the rust bindings more safe, as well as the C code, moving toward the end-goal of allowing us to put driver structures into read-only memory. We aren't there yet, but are getting closer. - minor devres cleanups and fixes found by code inspection - arch_topology minor changes - other minor driver core cleanups All of these have been in linux-next for a very long time with no reported problems" * tag 'driver-core-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (55 commits) ARM: sa1100: make match function take a const pointer sysfs/cpu: Make crash_hotplug attribute world-readable dio: Have dio_bus_match() callback take a const * zorro: make match function take a const pointer driver core: module: make module_[add|remove]_driver take a const * driver core: make driver_find_device() take a const * driver core: make driver_[create|remove]_file take a const * firmware_loader: fix soundness issue in `request_internal` firmware_loader: annotate doctests as `no_run` devres: Correct code style for functions that return a pointer type devres: Initialize an uninitialized struct member devres: Fix memory leakage caused by driver API devm_free_percpu() devres: Fix devm_krealloc() wasting memory driver core: platform: Switch to use kmemdup_array() driver core: have match() callback in struct bus_type take a const * MAINTAINERS: add Rust device abstractions to DRIVER CORE device: rust: improve safety comments MAINTAINERS: add Danilo as FIRMWARE LOADER maintainer MAINTAINERS: add Rust FW abstractions to FIRMWARE LOADER firmware: rust: improve safety comments ...