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authorPalmer Dabbelt <palmer@rivosinc.com>2024-01-16 07:14:04 -0800
committerPalmer Dabbelt <palmer@rivosinc.com>2024-01-16 07:14:04 -0800
commita894e8ed09c6c7fa239711819db83b8c050eb7b0 (patch)
tree8cd4e5e9e12fa483d6551b4ca45c46ce52b3f5db /mm/debug.c
parentd4abde52b4b116111537593e2744b3234d18808d (diff)
parent2080ff9493072a94e42b1856d59f5f1bffb761b7 (diff)
Merge patch series "riscv: support kernel-mode Vector"
Andy Chiu <andy.chiu@sifive.com> says: This series provides support running Vector in kernel mode. Additionally, kernel-mode Vector can be configured to run without turnning off preemption on a CONFIG_PREEMPT kernel. Along with the suport, we add Vector optimized copy_{to,from}_user. And provide a simple threshold to decide when to run the vectorized functions. We decided to drop vectorized memcpy/memset/memmove for the moment due to the concern of memory side-effect in kernel_vector_begin(). The detailed description can be found at v9[0] This series is composed by 4 parts: patch 1-4: adds basic support for kernel-mode Vector patch 5: includes vectorized copy_{to,from}_user into the kernel patch 6: refactor context switch code in fpu [1] patch 7-10: provides some code refactors and support for preemptible kernel-mode Vector. This series can be merged if we feel any part of {1~4, 5, 6, 7~10} is mature enough. This patch is tested on a QEMU with V and verified that booting, normal userspace operations all work as usual with thresholds set to 0. Also, we test by launching multiple kernel threads which continuously executes and verifies Vector operations in the background. The module that tests these operation is expected to be upstream later. * b4-shazam-merge: riscv: vector: allow kernel-mode Vector with preemption riscv: vector: use kmem_cache to manage vector context riscv: vector: use a mask to write vstate_ctrl riscv: vector: do not pass task_struct into riscv_v_vstate_{save,restore}() riscv: fpu: drop SR_SD bit checking riscv: lib: vectorize copy_to_user/copy_from_user riscv: sched: defer restoring Vector context for user riscv: Add vector extension XOR implementation riscv: vector: make Vector always available for softirq context riscv: Add support for kernel mode vector Link: https://lore.kernel.org/r/20240115055929.4736-1-andy.chiu@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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