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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/mmu_context.h>
14#include <asm/page.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 }
63 return "";
64}
65
66static void dump_tlb(int first, int last)
67{
68 unsigned long s_entryhi, entryhi, asid, mmid;
69 unsigned long long entrylo0, entrylo1, pa;
70 unsigned int s_index, s_pagemask, s_guestctl1 = 0;
71 unsigned int pagemask, guestctl1 = 0, c0, c1, i;
72 unsigned long asidmask = cpu_asid_mask(¤t_cpu_data);
73 int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4);
74 unsigned long s_mmid;
75#ifdef CONFIG_32BIT
76 bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA);
77 int pwidth = xpa ? 11 : 8;
78 int vwidth = 8;
79#else
80 bool xpa = false;
81 int pwidth = 11;
82 int vwidth = 11;
83#endif
84
85 s_pagemask = read_c0_pagemask();
86 s_entryhi = read_c0_entryhi();
87 s_index = read_c0_index();
88
89 if (cpu_has_mmid)
90 asid = s_mmid = read_c0_memorymapid();
91 else
92 asid = s_entryhi & asidmask;
93
94 if (cpu_has_guestid)
95 s_guestctl1 = read_c0_guestctl1();
96
97 for (i = first; i <= last; i++) {
98 write_c0_index(i);
99 mtc0_tlbr_hazard();
100 tlb_read();
101 tlb_read_hazard();
102 pagemask = read_c0_pagemask();
103 entryhi = read_c0_entryhi();
104 entrylo0 = read_c0_entrylo0();
105 entrylo1 = read_c0_entrylo1();
106
107 if (cpu_has_mmid)
108 mmid = read_c0_memorymapid();
109 else
110 mmid = entryhi & asidmask;
111
112 if (cpu_has_guestid)
113 guestctl1 = read_c0_guestctl1();
114
115 /* EHINV bit marks entire entry as invalid */
116 if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
117 continue;
118 /*
119 * Prior to tlbinv, unused entries have a virtual address of
120 * CKSEG0.
121 */
122 if ((entryhi & ~0x1ffffUL) == CKSEG0)
123 continue;
124 /*
125 * ASID takes effect in absence of G (global) bit.
126 * We check both G bits, even though architecturally they should
127 * match one another, because some revisions of the SB1 core may
128 * leave only a single G bit set after a machine check exception
129 * due to duplicate TLB entry.
130 */
131 if (!((entrylo0 | entrylo1) & ENTRYLO_G) && (mmid != asid))
132 continue;
133
134 /*
135 * Only print entries in use
136 */
137 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
138
139 c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
140 c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
141
142 pr_cont("va=%0*lx asid=%0*lx",
143 vwidth, (entryhi & ~0x1fffUL),
144 asidwidth, mmid);
145 if (cpu_has_guestid)
146 pr_cont(" gid=%02lx",
147 (guestctl1 & MIPS_GCTL1_RID)
148 >> MIPS_GCTL1_RID_SHIFT);
149 /* RI/XI are in awkward places, so mask them off separately */
150 pa = entrylo0 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
151 if (xpa)
152 pa |= (unsigned long long)readx_c0_entrylo0() << 30;
153 pa = (pa << 6) & PAGE_MASK;
154 pr_cont("\n\t[");
155 if (cpu_has_rixi)
156 pr_cont("ri=%d xi=%d ",
157 (entrylo0 & MIPS_ENTRYLO_RI) ? 1 : 0,
158 (entrylo0 & MIPS_ENTRYLO_XI) ? 1 : 0);
159 pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d] [",
160 pwidth, pa, c0,
161 (entrylo0 & ENTRYLO_D) ? 1 : 0,
162 (entrylo0 & ENTRYLO_V) ? 1 : 0,
163 (entrylo0 & ENTRYLO_G) ? 1 : 0);
164 /* RI/XI are in awkward places, so mask them off separately */
165 pa = entrylo1 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
166 if (xpa)
167 pa |= (unsigned long long)readx_c0_entrylo1() << 30;
168 pa = (pa << 6) & PAGE_MASK;
169 if (cpu_has_rixi)
170 pr_cont("ri=%d xi=%d ",
171 (entrylo1 & MIPS_ENTRYLO_RI) ? 1 : 0,
172 (entrylo1 & MIPS_ENTRYLO_XI) ? 1 : 0);
173 pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d]\n",
174 pwidth, pa, c1,
175 (entrylo1 & ENTRYLO_D) ? 1 : 0,
176 (entrylo1 & ENTRYLO_V) ? 1 : 0,
177 (entrylo1 & ENTRYLO_G) ? 1 : 0);
178 }
179 printk("\n");
180
181 write_c0_entryhi(s_entryhi);
182 write_c0_index(s_index);
183 write_c0_pagemask(s_pagemask);
184 if (cpu_has_guestid)
185 write_c0_guestctl1(s_guestctl1);
186}
187
188void dump_tlb_all(void)
189{
190 dump_tlb(0, current_cpu_data.tlbsize - 1);
191}
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/hazards.h>
11#include <asm/mipsregs.h>
12#include <asm/page.h>
13#include <asm/pgtable.h>
14#include <asm/tlbdebug.h>
15
16void dump_tlb_regs(void)
17{
18 const int field = 2 * sizeof(unsigned long);
19
20 pr_info("Index : %0x\n", read_c0_index());
21 pr_info("PageMask : %0x\n", read_c0_pagemask());
22 pr_info("EntryHi : %0*lx\n", field, read_c0_entryhi());
23 pr_info("EntryLo0 : %0*lx\n", field, read_c0_entrylo0());
24 pr_info("EntryLo1 : %0*lx\n", field, read_c0_entrylo1());
25 pr_info("Wired : %0x\n", read_c0_wired());
26 switch (current_cpu_type()) {
27 case CPU_R10000:
28 case CPU_R12000:
29 case CPU_R14000:
30 case CPU_R16000:
31 pr_info("FrameMask: %0x\n", read_c0_framemask());
32 break;
33 }
34 if (cpu_has_small_pages || cpu_has_rixi || cpu_has_xpa)
35 pr_info("PageGrain: %0x\n", read_c0_pagegrain());
36 if (cpu_has_htw) {
37 pr_info("PWField : %0*lx\n", field, read_c0_pwfield());
38 pr_info("PWSize : %0*lx\n", field, read_c0_pwsize());
39 pr_info("PWCtl : %0x\n", read_c0_pwctl());
40 }
41}
42
43static inline const char *msk2str(unsigned int mask)
44{
45 switch (mask) {
46 case PM_4K: return "4kb";
47 case PM_16K: return "16kb";
48 case PM_64K: return "64kb";
49 case PM_256K: return "256kb";
50#ifdef CONFIG_CPU_CAVIUM_OCTEON
51 case PM_8K: return "8kb";
52 case PM_32K: return "32kb";
53 case PM_128K: return "128kb";
54 case PM_512K: return "512kb";
55 case PM_2M: return "2Mb";
56 case PM_8M: return "8Mb";
57 case PM_32M: return "32Mb";
58#endif
59#ifndef CONFIG_CPU_VR41XX
60 case PM_1M: return "1Mb";
61 case PM_4M: return "4Mb";
62 case PM_16M: return "16Mb";
63 case PM_64M: return "64Mb";
64 case PM_256M: return "256Mb";
65 case PM_1G: return "1Gb";
66#endif
67 }
68 return "";
69}
70
71static void dump_tlb(int first, int last)
72{
73 unsigned long s_entryhi, entryhi, asid;
74 unsigned long long entrylo0, entrylo1, pa;
75 unsigned int s_index, s_pagemask, pagemask, c0, c1, i;
76#ifdef CONFIG_32BIT
77 bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA);
78 int pwidth = xpa ? 11 : 8;
79 int vwidth = 8;
80#else
81 bool xpa = false;
82 int pwidth = 11;
83 int vwidth = 11;
84#endif
85
86 s_pagemask = read_c0_pagemask();
87 s_entryhi = read_c0_entryhi();
88 s_index = read_c0_index();
89 asid = s_entryhi & 0xff;
90
91 for (i = first; i <= last; i++) {
92 write_c0_index(i);
93 mtc0_tlbr_hazard();
94 tlb_read();
95 tlb_read_hazard();
96 pagemask = read_c0_pagemask();
97 entryhi = read_c0_entryhi();
98 entrylo0 = read_c0_entrylo0();
99 entrylo1 = read_c0_entrylo1();
100
101 /* EHINV bit marks entire entry as invalid */
102 if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
103 continue;
104 /*
105 * Prior to tlbinv, unused entries have a virtual address of
106 * CKSEG0.
107 */
108 if ((entryhi & ~0x1ffffUL) == CKSEG0)
109 continue;
110 /*
111 * ASID takes effect in absence of G (global) bit.
112 * We check both G bits, even though architecturally they should
113 * match one another, because some revisions of the SB1 core may
114 * leave only a single G bit set after a machine check exception
115 * due to duplicate TLB entry.
116 */
117 if (!((entrylo0 | entrylo1) & ENTRYLO_G) &&
118 (entryhi & 0xff) != asid)
119 continue;
120
121 /*
122 * Only print entries in use
123 */
124 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
125
126 c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
127 c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
128
129 printk("va=%0*lx asid=%02lx\n",
130 vwidth, (entryhi & ~0x1fffUL),
131 entryhi & 0xff);
132 /* RI/XI are in awkward places, so mask them off separately */
133 pa = entrylo0 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
134 if (xpa)
135 pa |= (unsigned long long)readx_c0_entrylo0() << 30;
136 pa = (pa << 6) & PAGE_MASK;
137 printk("\t[");
138 if (cpu_has_rixi)
139 printk("ri=%d xi=%d ",
140 (entrylo0 & MIPS_ENTRYLO_RI) ? 1 : 0,
141 (entrylo0 & MIPS_ENTRYLO_XI) ? 1 : 0);
142 printk("pa=%0*llx c=%d d=%d v=%d g=%d] [",
143 pwidth, pa, c0,
144 (entrylo0 & ENTRYLO_D) ? 1 : 0,
145 (entrylo0 & ENTRYLO_V) ? 1 : 0,
146 (entrylo0 & ENTRYLO_G) ? 1 : 0);
147 /* RI/XI are in awkward places, so mask them off separately */
148 pa = entrylo1 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
149 if (xpa)
150 pa |= (unsigned long long)readx_c0_entrylo1() << 30;
151 pa = (pa << 6) & PAGE_MASK;
152 if (cpu_has_rixi)
153 printk("ri=%d xi=%d ",
154 (entrylo1 & MIPS_ENTRYLO_RI) ? 1 : 0,
155 (entrylo1 & MIPS_ENTRYLO_XI) ? 1 : 0);
156 printk("pa=%0*llx c=%d d=%d v=%d g=%d]\n",
157 pwidth, pa, c1,
158 (entrylo1 & ENTRYLO_D) ? 1 : 0,
159 (entrylo1 & ENTRYLO_V) ? 1 : 0,
160 (entrylo1 & ENTRYLO_G) ? 1 : 0);
161 }
162 printk("\n");
163
164 write_c0_entryhi(s_entryhi);
165 write_c0_index(s_index);
166 write_c0_pagemask(s_pagemask);
167}
168
169void dump_tlb_all(void)
170{
171 dump_tlb(0, current_cpu_data.tlbsize - 1);
172}