While reviewing Alexandre Ghiti's "riscv: tlb flush improvements" series[1], I noticed that most TLB flush functions end up as a call to local_flush_tlb_all() when SMP is disabled. This series resolves that. Along the way, I realized that we should be using single-ASID flushes wherever possible, so I implemented that as well. [1]: https://lore.kernel.org/linux-riscv/20231019140151.21629-1-alexghiti@xxxxxxxxxxxx/ --- This series is based on v5 of Alexandre's changes, which I have included here so the series can be built by the CI bots. I will rebase once his series is merged. Changes in v2: - Rebase on Alexandre's "riscv: tlb flush improvements" series v5 - Move the SMP/UP merge earlier in the series to avoid build issues - Make a copy of __flush_tlb_range() instead of adding ifdefs inside - local_flush_tlb_all() is the only function used on !MMU (smpboot.c) Alexandre Ghiti (4): riscv: Improve tlb_flush() riscv: Improve flush_tlb_range() for hugetlb pages riscv: Make __flush_tlb_range() loop over pte instead of flushing the whole tlb riscv: Improve flush_tlb_kernel_range() Samuel Holland (7): riscv: mm: Combine the SMP and UP TLB flush code riscv: Apply SiFive CIP-1200 workaround to single-ASID sfence.vma riscv: mm: Introduce cntx2asid/cntx2version helper macros riscv: mm: Use a fixed layout for the MM context ID riscv: mm: Make asid_bits a local variable riscv: mm: Preserve global TLB entries when switching contexts riscv: mm: Always use ASID to flush MM contexts arch/riscv/include/asm/errata_list.h | 12 +- arch/riscv/include/asm/mmu.h | 3 + arch/riscv/include/asm/mmu_context.h | 2 - arch/riscv/include/asm/sbi.h | 3 - arch/riscv/include/asm/tlb.h | 8 +- arch/riscv/include/asm/tlbflush.h | 59 +++++---- arch/riscv/kernel/sbi.c | 32 ++--- arch/riscv/mm/Makefile | 5 +- arch/riscv/mm/context.c | 26 ++-- arch/riscv/mm/tlbflush.c | 184 ++++++++++++++++----------- 10 files changed, 186 insertions(+), 148 deletions(-) -- 2.42.0
