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1/*
2 * Dump R4x00 TLB for debugging purposes.
3 *
4 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
5 * Copyright (C) 1999 by Silicon Graphics, Inc.
6 */
7#include <linux/kernel.h>
8#include <linux/mm.h>
9
10#include <asm/mipsregs.h>
11#include <asm/page.h>
12#include <asm/pgtable.h>
13#include <asm/tlbdebug.h>
14
15static inline const char *msk2str(unsigned int mask)
16{
17 switch (mask) {
18 case PM_4K: return "4kb";
19 case PM_16K: return "16kb";
20 case PM_64K: return "64kb";
21 case PM_256K: return "256kb";
22#ifdef CONFIG_CPU_CAVIUM_OCTEON
23 case PM_8K: return "8kb";
24 case PM_32K: return "32kb";
25 case PM_128K: return "128kb";
26 case PM_512K: return "512kb";
27 case PM_2M: return "2Mb";
28 case PM_8M: return "8Mb";
29 case PM_32M: return "32Mb";
30#endif
31#ifndef CONFIG_CPU_VR41XX
32 case PM_1M: return "1Mb";
33 case PM_4M: return "4Mb";
34 case PM_16M: return "16Mb";
35 case PM_64M: return "64Mb";
36 case PM_256M: return "256Mb";
37 case PM_1G: return "1Gb";
38#endif
39 }
40 return "";
41}
42
43#define BARRIER() \
44 __asm__ __volatile__( \
45 ".set\tnoreorder\n\t" \
46 "nop;nop;nop;nop;nop;nop;nop\n\t" \
47 ".set\treorder");
48
49static void dump_tlb(int first, int last)
50{
51 unsigned long s_entryhi, entryhi, asid;
52 unsigned long long entrylo0, entrylo1;
53 unsigned int s_index, pagemask, c0, c1, i;
54
55 s_entryhi = read_c0_entryhi();
56 s_index = read_c0_index();
57 asid = s_entryhi & 0xff;
58
59 for (i = first; i <= last; i++) {
60 write_c0_index(i);
61 BARRIER();
62 tlb_read();
63 BARRIER();
64 pagemask = read_c0_pagemask();
65 entryhi = read_c0_entryhi();
66 entrylo0 = read_c0_entrylo0();
67 entrylo1 = read_c0_entrylo1();
68
69 /* Unused entries have a virtual address of CKSEG0. */
70 if ((entryhi & ~0x1ffffUL) != CKSEG0
71 && (entryhi & 0xff) == asid) {
72#ifdef CONFIG_32BIT
73 int width = 8;
74#else
75 int width = 11;
76#endif
77 /*
78 * Only print entries in use
79 */
80 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
81
82 c0 = (entrylo0 >> 3) & 7;
83 c1 = (entrylo1 >> 3) & 7;
84
85 printk("va=%0*lx asid=%02lx\n",
86 width, (entryhi & ~0x1fffUL),
87 entryhi & 0xff);
88 printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
89 width,
90 (entrylo0 << 6) & PAGE_MASK, c0,
91 (entrylo0 & 4) ? 1 : 0,
92 (entrylo0 & 2) ? 1 : 0,
93 (entrylo0 & 1) ? 1 : 0);
94 printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",
95 width,
96 (entrylo1 << 6) & PAGE_MASK, c1,
97 (entrylo1 & 4) ? 1 : 0,
98 (entrylo1 & 2) ? 1 : 0,
99 (entrylo1 & 1) ? 1 : 0);
100 }
101 }
102 printk("\n");
103
104 write_c0_entryhi(s_entryhi);
105 write_c0_index(s_index);
106}
107
108void dump_tlb_all(void)
109{
110 dump_tlb(0, current_cpu_data.tlbsize - 1);
111}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Dump R4x00 TLB for debugging purposes.
4 *
5 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
6 * Copyright (C) 1999 by Silicon Graphics, Inc.
7 */
8#include <linux/kernel.h>
9#include <linux/mm.h>
10
11#include <asm/hazards.h>
12#include <asm/mipsregs.h>
13#include <asm/page.h>
14#include <asm/pgtable.h>
15#include <asm/tlbdebug.h>
16
17void dump_tlb_regs(void)
18{
19 const int field = 2 * sizeof(unsigned long);
20
21 pr_info("Index : %0x\n", read_c0_index());
22 pr_info("PageMask : %0x\n", read_c0_pagemask());
23 if (cpu_has_guestid)
24 pr_info("GuestCtl1: %0x\n", read_c0_guestctl1());
25 pr_info("EntryHi : %0*lx\n", field, read_c0_entryhi());
26 pr_info("EntryLo0 : %0*lx\n", field, read_c0_entrylo0());
27 pr_info("EntryLo1 : %0*lx\n", field, read_c0_entrylo1());
28 pr_info("Wired : %0x\n", read_c0_wired());
29 switch (current_cpu_type()) {
30 case CPU_R10000:
31 case CPU_R12000:
32 case CPU_R14000:
33 case CPU_R16000:
34 pr_info("FrameMask: %0x\n", read_c0_framemask());
35 break;
36 }
37 if (cpu_has_small_pages || cpu_has_rixi || cpu_has_xpa)
38 pr_info("PageGrain: %0x\n", read_c0_pagegrain());
39 if (cpu_has_htw) {
40 pr_info("PWField : %0*lx\n", field, read_c0_pwfield());
41 pr_info("PWSize : %0*lx\n", field, read_c0_pwsize());
42 pr_info("PWCtl : %0x\n", read_c0_pwctl());
43 }
44}
45
46static inline const char *msk2str(unsigned int mask)
47{
48 switch (mask) {
49 case PM_4K: return "4kb";
50 case PM_16K: return "16kb";
51 case PM_64K: return "64kb";
52 case PM_256K: return "256kb";
53#ifdef CONFIG_CPU_CAVIUM_OCTEON
54 case PM_8K: return "8kb";
55 case PM_32K: return "32kb";
56 case PM_128K: return "128kb";
57 case PM_512K: return "512kb";
58 case PM_2M: return "2Mb";
59 case PM_8M: return "8Mb";
60 case PM_32M: return "32Mb";
61#endif
62#ifndef CONFIG_CPU_VR41XX
63 case PM_1M: return "1Mb";
64 case PM_4M: return "4Mb";
65 case PM_16M: return "16Mb";
66 case PM_64M: return "64Mb";
67 case PM_256M: return "256Mb";
68 case PM_1G: return "1Gb";
69#endif
70 }
71 return "";
72}
73
74static void dump_tlb(int first, int last)
75{
76 unsigned long s_entryhi, entryhi, asid;
77 unsigned long long entrylo0, entrylo1, pa;
78 unsigned int s_index, s_pagemask, s_guestctl1 = 0;
79 unsigned int pagemask, guestctl1 = 0, c0, c1, i;
80 unsigned long asidmask = cpu_asid_mask(¤t_cpu_data);
81 int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4);
82#ifdef CONFIG_32BIT
83 bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA);
84 int pwidth = xpa ? 11 : 8;
85 int vwidth = 8;
86#else
87 bool xpa = false;
88 int pwidth = 11;
89 int vwidth = 11;
90#endif
91
92 s_pagemask = read_c0_pagemask();
93 s_entryhi = read_c0_entryhi();
94 s_index = read_c0_index();
95 asid = s_entryhi & asidmask;
96 if (cpu_has_guestid)
97 s_guestctl1 = read_c0_guestctl1();
98
99 for (i = first; i <= last; i++) {
100 write_c0_index(i);
101 mtc0_tlbr_hazard();
102 tlb_read();
103 tlb_read_hazard();
104 pagemask = read_c0_pagemask();
105 entryhi = read_c0_entryhi();
106 entrylo0 = read_c0_entrylo0();
107 entrylo1 = read_c0_entrylo1();
108 if (cpu_has_guestid)
109 guestctl1 = read_c0_guestctl1();
110
111 /* EHINV bit marks entire entry as invalid */
112 if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
113 continue;
114 /*
115 * Prior to tlbinv, unused entries have a virtual address of
116 * CKSEG0.
117 */
118 if ((entryhi & ~0x1ffffUL) == CKSEG0)
119 continue;
120 /*
121 * ASID takes effect in absence of G (global) bit.
122 * We check both G bits, even though architecturally they should
123 * match one another, because some revisions of the SB1 core may
124 * leave only a single G bit set after a machine check exception
125 * due to duplicate TLB entry.
126 */
127 if (!((entrylo0 | entrylo1) & ENTRYLO_G) &&
128 (entryhi & asidmask) != asid)
129 continue;
130
131 /*
132 * Only print entries in use
133 */
134 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
135
136 c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
137 c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
138
139 pr_cont("va=%0*lx asid=%0*lx",
140 vwidth, (entryhi & ~0x1fffUL),
141 asidwidth, entryhi & asidmask);
142 if (cpu_has_guestid)
143 pr_cont(" gid=%02lx",
144 (guestctl1 & MIPS_GCTL1_RID)
145 >> MIPS_GCTL1_RID_SHIFT);
146 /* RI/XI are in awkward places, so mask them off separately */
147 pa = entrylo0 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
148 if (xpa)
149 pa |= (unsigned long long)readx_c0_entrylo0() << 30;
150 pa = (pa << 6) & PAGE_MASK;
151 pr_cont("\n\t[");
152 if (cpu_has_rixi)
153 pr_cont("ri=%d xi=%d ",
154 (entrylo0 & MIPS_ENTRYLO_RI) ? 1 : 0,
155 (entrylo0 & MIPS_ENTRYLO_XI) ? 1 : 0);
156 pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d] [",
157 pwidth, pa, c0,
158 (entrylo0 & ENTRYLO_D) ? 1 : 0,
159 (entrylo0 & ENTRYLO_V) ? 1 : 0,
160 (entrylo0 & ENTRYLO_G) ? 1 : 0);
161 /* RI/XI are in awkward places, so mask them off separately */
162 pa = entrylo1 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
163 if (xpa)
164 pa |= (unsigned long long)readx_c0_entrylo1() << 30;
165 pa = (pa << 6) & PAGE_MASK;
166 if (cpu_has_rixi)
167 pr_cont("ri=%d xi=%d ",
168 (entrylo1 & MIPS_ENTRYLO_RI) ? 1 : 0,
169 (entrylo1 & MIPS_ENTRYLO_XI) ? 1 : 0);
170 pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d]\n",
171 pwidth, pa, c1,
172 (entrylo1 & ENTRYLO_D) ? 1 : 0,
173 (entrylo1 & ENTRYLO_V) ? 1 : 0,
174 (entrylo1 & ENTRYLO_G) ? 1 : 0);
175 }
176 printk("\n");
177
178 write_c0_entryhi(s_entryhi);
179 write_c0_index(s_index);
180 write_c0_pagemask(s_pagemask);
181 if (cpu_has_guestid)
182 write_c0_guestctl1(s_guestctl1);
183}
184
185void dump_tlb_all(void)
186{
187 dump_tlb(0, current_cpu_data.tlbsize - 1);
188}