1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/mm.h>
 4#include <linux/smp.h>
 5#include <linux/sched.h>
 6#include <asm/sbi.h>
 
 
 7
 8void flush_tlb_all(void)
 9{
10	sbi_remote_sfence_vma(NULL, 0, -1);
11}
12
13/*
14 * This function must not be called with cmask being null.
15 * Kernel may panic if cmask is NULL.
16 */
17static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
18				  unsigned long size)
19{
20	struct cpumask hmask;
 
21	unsigned int cpuid;
 
22
23	if (cpumask_empty(cmask))
24		return;
25
26	cpuid = get_cpu();
27
28	if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
29		/* local cpu is the only cpu present in cpumask */
30		if (size <= PAGE_SIZE)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
31			local_flush_tlb_page(start);
32		else
33			local_flush_tlb_all();
34	} else {
35		riscv_cpuid_to_hartid_mask(cmask, &hmask);
36		sbi_remote_sfence_vma(cpumask_bits(&hmask), start, size);
37	}
38
39	put_cpu();
40}
41
42void flush_tlb_mm(struct mm_struct *mm)
43{
44	__sbi_tlb_flush_range(mm_cpumask(mm), 0, -1);
45}
46
47void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
48{
49	__sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE);
50}
51
52void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
53		     unsigned long end)
54{
55	__sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), start, end - start);
 
 
 
 
 
 
56}

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/mm.h>
 4#include <linux/smp.h>
 5#include <linux/sched.h>
 6#include <asm/sbi.h>
 7#include <asm/mmu_context.h>
 8#include <asm/tlbflush.h>
 9
10void flush_tlb_all(void)
11{
12	sbi_remote_sfence_vma(NULL, 0, -1);
13}
14
15static void __sbi_tlb_flush_range(struct mm_struct *mm, unsigned long start,
16				  unsigned long size, unsigned long stride)
 
 
 
 
17{
18	struct cpumask *pmask = &mm->context.tlb_stale_mask;
19	struct cpumask *cmask = mm_cpumask(mm);
20	unsigned int cpuid;
21	bool broadcast;
22
23	if (cpumask_empty(cmask))
24		return;
25
26	cpuid = get_cpu();
27	/* check if the tlbflush needs to be sent to other CPUs */
28	broadcast = cpumask_any_but(cmask, cpuid) < nr_cpu_ids;
29	if (static_branch_unlikely(&use_asid_allocator)) {
30		unsigned long asid = atomic_long_read(&mm->context.id);
31
32		/*
33		 * TLB will be immediately flushed on harts concurrently
34		 * executing this MM context. TLB flush on other harts
35		 * is deferred until this MM context migrates there.
36		 */
37		cpumask_setall(pmask);
38		cpumask_clear_cpu(cpuid, pmask);
39		cpumask_andnot(pmask, pmask, cmask);
40
41		if (broadcast) {
42			sbi_remote_sfence_vma_asid(cmask, start, size, asid);
43		} else if (size <= stride) {
44			local_flush_tlb_page_asid(start, asid);
45		} else {
46			local_flush_tlb_all_asid(asid);
47		}
48	} else {
49		if (broadcast) {
50			sbi_remote_sfence_vma(cmask, start, size);
51		} else if (size <= stride) {
52			local_flush_tlb_page(start);
53		} else {
54			local_flush_tlb_all();
55		}
 
 
56	}
57
58	put_cpu();
59}
60
61void flush_tlb_mm(struct mm_struct *mm)
62{
63	__sbi_tlb_flush_range(mm, 0, -1, PAGE_SIZE);
64}
65
66void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
67{
68	__sbi_tlb_flush_range(vma->vm_mm, addr, PAGE_SIZE, PAGE_SIZE);
69}
70
71void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
72		     unsigned long end)
73{
74	__sbi_tlb_flush_range(vma->vm_mm, start, end - start, PAGE_SIZE);
75}
76#ifdef CONFIG_TRANSPARENT_HUGEPAGE
77void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
78			unsigned long end)
79{
80	__sbi_tlb_flush_range(vma->vm_mm, start, end - start, PMD_SIZE);
81}
82#endif