1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_TLBFLUSH_H
3 #define _ASM_POWERPC_NOHASH_TLBFLUSH_H
4 
5 /*
6  * TLB flushing:
7  *
8  *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
9  *  - flush_tlb_page(vma, vmaddr) flushes one page
10  *  - local_flush_tlb_mm(mm, full) flushes the specified mm context on
11  *                           the local processor
12  *  - local_flush_tlb_page(vma, vmaddr) flushes one page on the local processor
13  *  - flush_tlb_range(vma, start, end) flushes a range of pages
14  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
15  *
16  */
17 
18 /*
19  * TLB flushing for software loaded TLB chips
20  *
21  * TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
22  * flush_tlb_kernel_range are best implemented as tlbia vs
23  * specific tlbie's
24  */
25 
26 struct vm_area_struct;
27 struct mm_struct;
28 
29 #define MMU_NO_CONTEXT      	((unsigned int)-1)
30 
31 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
32 			    unsigned long end);
33 
34 #ifdef CONFIG_PPC_8xx
35 static inline void local_flush_tlb_mm(struct mm_struct *mm)
36 {
37 	unsigned int pid = READ_ONCE(mm->context.id);
38 
39 	if (pid != MMU_NO_CONTEXT)
40 		asm volatile ("sync; tlbia; isync" : : : "memory");
41 }
42 
43 static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
44 {
45 	asm volatile ("tlbie %0; sync" : : "r" (vmaddr) : "memory");
46 }
47 
48 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
49 {
50 	start &= PAGE_MASK;
51 
52 	if (end - start <= PAGE_SIZE)
53 		asm volatile ("tlbie %0; sync" : : "r" (start) : "memory");
54 	else
55 		asm volatile ("sync; tlbia; isync" : : : "memory");
56 }
57 #else
58 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
59 extern void local_flush_tlb_mm(struct mm_struct *mm);
60 extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
61 
62 extern void __local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
63 				   int tsize, int ind);
64 #endif
65 
66 #ifdef CONFIG_SMP
67 extern void flush_tlb_mm(struct mm_struct *mm);
68 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
69 extern void __flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
70 			     int tsize, int ind);
71 #else
72 #define flush_tlb_mm(mm)		local_flush_tlb_mm(mm)
73 #define flush_tlb_page(vma,addr)	local_flush_tlb_page(vma,addr)
74 #define __flush_tlb_page(mm,addr,p,i)	__local_flush_tlb_page(mm,addr,p,i)
75 #endif
76 
77 #endif /* _ASM_POWERPC_NOHASH_TLBFLUSH_H */
78