1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 * 5 * Derived from MIPS: 6 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle. 7 * Copyright (C) 1999 by Silicon Graphics, Inc. 8 */ 9 #include <linux/kernel.h> 10 #include <linux/mm.h> 11 12 #include <asm/loongarch.h> 13 #include <asm/page.h> 14 #include <asm/pgtable.h> 15 #include <asm/tlb.h> 16 17 void dump_tlb_regs(void) 18 { 19 const int field = 2 * sizeof(unsigned long); 20 21 pr_info("Index : 0x%0x\n", read_csr_tlbidx()); 22 pr_info("PageSize : 0x%0x\n", read_csr_pagesize()); 23 pr_info("EntryHi : 0x%0*llx\n", field, read_csr_entryhi()); 24 pr_info("EntryLo0 : 0x%0*llx\n", field, read_csr_entrylo0()); 25 pr_info("EntryLo1 : 0x%0*llx\n", field, read_csr_entrylo1()); 26 } 27 28 static void dump_tlb(int first, int last) 29 { 30 unsigned long s_entryhi, entryhi, asid; 31 unsigned long long entrylo0, entrylo1, pa; 32 unsigned int index; 33 unsigned int s_index, s_asid; 34 unsigned int pagesize, c0, c1, i; 35 unsigned long asidmask = cpu_asid_mask(¤t_cpu_data); 36 int pwidth = 16; 37 int vwidth = 16; 38 int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4); 39 40 s_entryhi = read_csr_entryhi(); 41 s_index = read_csr_tlbidx(); 42 s_asid = read_csr_asid(); 43 44 for (i = first; i <= last; i++) { 45 write_csr_index(i); 46 tlb_read(); 47 pagesize = read_csr_pagesize(); 48 entryhi = read_csr_entryhi(); 49 entrylo0 = read_csr_entrylo0(); 50 entrylo1 = read_csr_entrylo1(); 51 index = read_csr_tlbidx(); 52 asid = read_csr_asid(); 53 54 /* EHINV bit marks entire entry as invalid */ 55 if (index & CSR_TLBIDX_EHINV) 56 continue; 57 /* 58 * ASID takes effect in absence of G (global) bit. 59 */ 60 if (!((entrylo0 | entrylo1) & ENTRYLO_G) && 61 asid != s_asid) 62 continue; 63 64 /* 65 * Only print entries in use 66 */ 67 pr_info("Index: %4d pgsize=0x%x ", i, (1 << pagesize)); 68 69 c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT; 70 c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT; 71 72 pr_cont("va=0x%0*lx asid=0x%0*lx", 73 vwidth, (entryhi & ~0x1fffUL), asidwidth, asid & asidmask); 74 75 /* NR/NX are in awkward places, so mask them off separately */ 76 pa = entrylo0 & ~(ENTRYLO_NR | ENTRYLO_NX); 77 pa = pa & PAGE_MASK; 78 pr_cont("\n\t["); 79 pr_cont("nr=%d nx=%d ", 80 (entrylo0 & ENTRYLO_NR) ? 1 : 0, 81 (entrylo0 & ENTRYLO_NX) ? 1 : 0); 82 pr_cont("pa=0x%0*llx c=%d d=%d v=%d g=%d plv=%lld] [", 83 pwidth, pa, c0, 84 (entrylo0 & ENTRYLO_D) ? 1 : 0, 85 (entrylo0 & ENTRYLO_V) ? 1 : 0, 86 (entrylo0 & ENTRYLO_G) ? 1 : 0, 87 (entrylo0 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT); 88 /* NR/NX are in awkward places, so mask them off separately */ 89 pa = entrylo1 & ~(ENTRYLO_NR | ENTRYLO_NX); 90 pa = pa & PAGE_MASK; 91 pr_cont("nr=%d nx=%d ", 92 (entrylo1 & ENTRYLO_NR) ? 1 : 0, 93 (entrylo1 & ENTRYLO_NX) ? 1 : 0); 94 pr_cont("pa=0x%0*llx c=%d d=%d v=%d g=%d plv=%lld]\n", 95 pwidth, pa, c1, 96 (entrylo1 & ENTRYLO_D) ? 1 : 0, 97 (entrylo1 & ENTRYLO_V) ? 1 : 0, 98 (entrylo1 & ENTRYLO_G) ? 1 : 0, 99 (entrylo1 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT); 100 } 101 pr_info("\n"); 102 103 write_csr_entryhi(s_entryhi); 104 write_csr_tlbidx(s_index); 105 write_csr_asid(s_asid); 106 } 107 108 void dump_tlb_all(void) 109 { 110 dump_tlb(0, current_cpu_data.tlbsize - 1); 111 } 112