1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _PARISC_TLBFLUSH_H 3 #define _PARISC_TLBFLUSH_H 4 5 /* TLB flushing routines.... */ 6 7 #include <linux/mm.h> 8 #include <linux/sched.h> 9 #include <asm/mmu_context.h> 10 11 extern void flush_tlb_all(void); 12 extern void flush_tlb_all_local(void *); 13 14 #define smp_flush_tlb_all() flush_tlb_all() 15 16 int __flush_tlb_range(unsigned long sid, 17 unsigned long start, unsigned long end); 18 19 #define flush_tlb_range(vma, start, end) \ 20 __flush_tlb_range((vma)->vm_mm->context, start, end) 21 22 #define flush_tlb_kernel_range(start, end) \ 23 __flush_tlb_range(0, start, end) 24 25 /* 26 * flush_tlb_mm() 27 * 28 * The code to switch to a new context is NOT valid for processes 29 * which play with the space id's. Thus, we have to preserve the 30 * space and just flush the entire tlb. However, the compilers, 31 * dynamic linker, etc, do not manipulate space id's, so there 32 * could be a significant performance benefit in switching contexts 33 * and not flushing the whole tlb. 34 */ 35 36 static inline void flush_tlb_mm(struct mm_struct *mm) 37 { 38 BUG_ON(mm == &init_mm); /* Should never happen */ 39 40 #if 1 || defined(CONFIG_SMP) 41 /* Except for very small threads, flushing the whole TLB is 42 * faster than using __flush_tlb_range. The pdtlb and pitlb 43 * instructions are very slow because of the TLB broadcast. 44 * It might be faster to do local range flushes on all CPUs 45 * on PA 2.0 systems. 46 */ 47 flush_tlb_all(); 48 #else 49 /* FIXME: currently broken, causing space id and protection ids 50 * to go out of sync, resulting in faults on userspace accesses. 51 * This approach needs further investigation since running many 52 * small applications (e.g., GCC testsuite) is faster on HP-UX. 53 */ 54 if (mm) { 55 if (mm->context != 0) 56 free_sid(mm->context); 57 mm->context = alloc_sid(); 58 if (mm == current->active_mm) 59 load_context(mm->context); 60 } 61 #endif 62 } 63 64 static inline void flush_tlb_page(struct vm_area_struct *vma, 65 unsigned long addr) 66 { 67 purge_tlb_entries(vma->vm_mm, addr); 68 } 69 #endif 70