1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4 #include <linux/cache.h>
5 #include <linux/highmem.h>
6 #include <linux/mm.h>
7 #include <asm/cache.h>
8
update_mmu_cache(struct vm_area_struct * vma,unsigned long address,pte_t * pte)9 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
10 pte_t *pte)
11 {
12 unsigned long addr;
13 struct page *page;
14
15 page = pfn_to_page(pte_pfn(*pte));
16 if (page == ZERO_PAGE(0))
17 return;
18
19 if (test_and_set_bit(PG_dcache_clean, &page->flags))
20 return;
21
22 addr = (unsigned long) kmap_atomic(page);
23
24 dcache_wb_range(addr, addr + PAGE_SIZE);
25
26 if (vma->vm_flags & VM_EXEC)
27 icache_inv_range(addr, addr + PAGE_SIZE);
28
29 kunmap_atomic((void *) addr);
30 }
31
flush_icache_deferred(struct mm_struct * mm)32 void flush_icache_deferred(struct mm_struct *mm)
33 {
34 unsigned int cpu = smp_processor_id();
35 cpumask_t *mask = &mm->context.icache_stale_mask;
36
37 if (cpumask_test_cpu(cpu, mask)) {
38 cpumask_clear_cpu(cpu, mask);
39 /*
40 * Ensure the remote hart's writes are visible to this hart.
41 * This pairs with a barrier in flush_icache_mm.
42 */
43 smp_mb();
44 local_icache_inv_all(NULL);
45 }
46 }
47
flush_icache_mm_range(struct mm_struct * mm,unsigned long start,unsigned long end)48 void flush_icache_mm_range(struct mm_struct *mm,
49 unsigned long start, unsigned long end)
50 {
51 unsigned int cpu;
52 cpumask_t others, *mask;
53
54 preempt_disable();
55
56 #ifdef CONFIG_CPU_HAS_ICACHE_INS
57 if (mm == current->mm) {
58 icache_inv_range(start, end);
59 preempt_enable();
60 return;
61 }
62 #endif
63
64 /* Mark every hart's icache as needing a flush for this MM. */
65 mask = &mm->context.icache_stale_mask;
66 cpumask_setall(mask);
67
68 /* Flush this hart's I$ now, and mark it as flushed. */
69 cpu = smp_processor_id();
70 cpumask_clear_cpu(cpu, mask);
71 local_icache_inv_all(NULL);
72
73 /*
74 * Flush the I$ of other harts concurrently executing, and mark them as
75 * flushed.
76 */
77 cpumask_andnot(&others, mm_cpumask(mm), cpumask_of(cpu));
78
79 if (mm != current->active_mm || !cpumask_empty(&others)) {
80 on_each_cpu_mask(&others, local_icache_inv_all, NULL, 1);
81 cpumask_clear(mask);
82 }
83
84 preempt_enable();
85 }
86