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3f1e782998
Implement optimized version of the tlb flushing routines for systems
using ASIDs. These are behind the use_asid_allocator static branch to
not affect existing systems not using ASIDs.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
[hch: rebased on top of previous cleanups, use the same algorithm as
the non-ASID based code for local vs global flushes, keep functions
as local as possible]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <asm/sbi.h>
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#include <asm/mmu_context.h>
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static inline void local_flush_tlb_all_asid(unsigned long asid)
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{
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__asm__ __volatile__ ("sfence.vma x0, %0"
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:
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: "r" (asid)
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: "memory");
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}
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static inline void local_flush_tlb_page_asid(unsigned long addr,
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unsigned long asid)
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{
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__asm__ __volatile__ ("sfence.vma %0, %1"
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:
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: "r" (addr), "r" (asid)
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: "memory");
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}
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void flush_tlb_all(void)
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{
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sbi_remote_sfence_vma(NULL, 0, -1);
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}
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static void __sbi_tlb_flush_range(struct mm_struct *mm, unsigned long start,
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unsigned long size, unsigned long stride)
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{
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struct cpumask *cmask = mm_cpumask(mm);
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struct cpumask hmask;
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unsigned int cpuid;
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bool broadcast;
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if (cpumask_empty(cmask))
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return;
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cpuid = get_cpu();
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/* check if the tlbflush needs to be sent to other CPUs */
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broadcast = cpumask_any_but(cmask, cpuid) < nr_cpu_ids;
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if (static_branch_unlikely(&use_asid_allocator)) {
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unsigned long asid = atomic_long_read(&mm->context.id);
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if (broadcast) {
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riscv_cpuid_to_hartid_mask(cmask, &hmask);
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sbi_remote_sfence_vma_asid(cpumask_bits(&hmask),
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start, size, asid);
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} else if (size <= stride) {
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local_flush_tlb_page_asid(start, asid);
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} else {
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local_flush_tlb_all_asid(asid);
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}
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} else {
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if (broadcast) {
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riscv_cpuid_to_hartid_mask(cmask, &hmask);
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sbi_remote_sfence_vma(cpumask_bits(&hmask),
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start, size);
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} else if (size <= stride) {
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local_flush_tlb_page(start);
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} else {
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local_flush_tlb_all();
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}
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}
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put_cpu();
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}
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void flush_tlb_mm(struct mm_struct *mm)
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{
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__sbi_tlb_flush_range(mm, 0, -1, PAGE_SIZE);
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}
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
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{
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__sbi_tlb_flush_range(vma->vm_mm, addr, PAGE_SIZE, PAGE_SIZE);
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}
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void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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__sbi_tlb_flush_range(vma->vm_mm, start, end - start, PAGE_SIZE);
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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__sbi_tlb_flush_range(vma->vm_mm, start, end - start, PMD_SIZE);
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}
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#endif
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