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-rw-r--r--arch/x86/Kconfig6
-rwxr-xr-xarch/x86/include/asm/cpu_debug.h193
-rw-r--r--arch/x86/kernel/cpu/Makefile2
-rwxr-xr-xarch/x86/kernel/cpu/cpu_debug.c784
4 files changed, 985 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 31758378bcd2..03f0a3aa43b1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -931,6 +931,12 @@ config X86_CPUID
931 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to 931 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
932 /dev/cpu/31/cpuid. 932 /dev/cpu/31/cpuid.
933 933
934config X86_CPU_DEBUG
935 tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"
936 ---help---
937 If you select this option, this will provide various x86 CPUs
938 information through debugfs.
939
934choice 940choice
935 prompt "High Memory Support" 941 prompt "High Memory Support"
936 default HIGHMEM4G if !X86_NUMAQ 942 default HIGHMEM4G if !X86_NUMAQ
diff --git a/arch/x86/include/asm/cpu_debug.h b/arch/x86/include/asm/cpu_debug.h
new file mode 100755
index 000000000000..d24d64fcee04
--- /dev/null
+++ b/arch/x86/include/asm/cpu_debug.h
@@ -0,0 +1,193 @@
1#ifndef _ASM_X86_CPU_DEBUG_H
2#define _ASM_X86_CPU_DEBUG_H
3
4/*
5 * CPU x86 architecture debug
6 *
7 * Copyright(C) 2009 Jaswinder Singh Rajput
8 */
9
10/* Register flags */
11enum cpu_debug_bit {
12/* Model Specific Registers (MSRs) */
13 CPU_MC_BIT, /* Machine Check */
14 CPU_MONITOR_BIT, /* Monitor */
15 CPU_TIME_BIT, /* Time */
16 CPU_PMC_BIT, /* Performance Monitor */
17 CPU_PLATFORM_BIT, /* Platform */
18 CPU_APIC_BIT, /* APIC */
19 CPU_POWERON_BIT, /* Power-on */
20 CPU_CONTROL_BIT, /* Control */
21 CPU_FEATURES_BIT, /* Features control */
22 CPU_LBRANCH_BIT, /* Last Branch */
23 CPU_BIOS_BIT, /* BIOS */
24 CPU_FREQ_BIT, /* Frequency */
25 CPU_MTTR_BIT, /* MTRR */
26 CPU_PERF_BIT, /* Performance */
27 CPU_CACHE_BIT, /* Cache */
28 CPU_SYSENTER_BIT, /* Sysenter */
29 CPU_THERM_BIT, /* Thermal */
30 CPU_MISC_BIT, /* Miscellaneous */
31 CPU_DEBUG_BIT, /* Debug */
32 CPU_PAT_BIT, /* PAT */
33 CPU_VMX_BIT, /* VMX */
34 CPU_CALL_BIT, /* System Call */
35 CPU_BASE_BIT, /* BASE Address */
36 CPU_SMM_BIT, /* System mgmt mode */
37 CPU_SVM_BIT, /*Secure Virtual Machine*/
38 CPU_OSVM_BIT, /* OS-Visible Workaround*/
39/* Standard Registers */
40 CPU_TSS_BIT, /* Task Stack Segment */
41 CPU_CR_BIT, /* Control Registers */
42 CPU_DT_BIT, /* Descriptor Table */
43/* End of Registers flags */
44 CPU_REG_ALL_BIT, /* Select all Registers */
45};
46
47#define CPU_REG_ALL (~0) /* Select all Registers */
48
49#define CPU_MC (1 << CPU_MC_BIT)
50#define CPU_MONITOR (1 << CPU_MONITOR_BIT)
51#define CPU_TIME (1 << CPU_TIME_BIT)
52#define CPU_PMC (1 << CPU_PMC_BIT)
53#define CPU_PLATFORM (1 << CPU_PLATFORM_BIT)
54#define CPU_APIC (1 << CPU_APIC_BIT)
55#define CPU_POWERON (1 << CPU_POWERON_BIT)
56#define CPU_CONTROL (1 << CPU_CONTROL_BIT)
57#define CPU_FEATURES (1 << CPU_FEATURES_BIT)
58#define CPU_LBRANCH (1 << CPU_LBRANCH_BIT)
59#define CPU_BIOS (1 << CPU_BIOS_BIT)
60#define CPU_FREQ (1 << CPU_FREQ_BIT)
61#define CPU_MTRR (1 << CPU_MTTR_BIT)
62#define CPU_PERF (1 << CPU_PERF_BIT)
63#define CPU_CACHE (1 << CPU_CACHE_BIT)
64#define CPU_SYSENTER (1 << CPU_SYSENTER_BIT)
65#define CPU_THERM (1 << CPU_THERM_BIT)
66#define CPU_MISC (1 << CPU_MISC_BIT)
67#define CPU_DEBUG (1 << CPU_DEBUG_BIT)
68#define CPU_PAT (1 << CPU_PAT_BIT)
69#define CPU_VMX (1 << CPU_VMX_BIT)
70#define CPU_CALL (1 << CPU_CALL_BIT)
71#define CPU_BASE (1 << CPU_BASE_BIT)
72#define CPU_SMM (1 << CPU_SMM_BIT)
73#define CPU_SVM (1 << CPU_SVM_BIT)
74#define CPU_OSVM (1 << CPU_OSVM_BIT)
75#define CPU_TSS (1 << CPU_TSS_BIT)
76#define CPU_CR (1 << CPU_CR_BIT)
77#define CPU_DT (1 << CPU_DT_BIT)
78
79/* Register file flags */
80enum cpu_file_bit {
81 CPU_INDEX_BIT, /* index */
82 CPU_VALUE_BIT, /* value */
83};
84
85#define CPU_FILE_VALUE (1 << CPU_VALUE_BIT)
86
87/*
88 * DisplayFamily_DisplayModel Processor Families/Processor Number Series
89 * -------------------------- ------------------------------------------
90 * 05_01, 05_02, 05_04 Pentium, Pentium with MMX
91 *
92 * 06_01 Pentium Pro
93 * 06_03, 06_05 Pentium II Xeon, Pentium II
94 * 06_07, 06_08, 06_0A, 06_0B Pentium III Xeon, Pentum III
95 *
96 * 06_09, 060D Pentium M
97 *
98 * 06_0E Core Duo, Core Solo
99 *
100 * 06_0F Xeon 3000, 3200, 5100, 5300, 7300 series,
101 * Core 2 Quad, Core 2 Extreme, Core 2 Duo,
102 * Pentium dual-core
103 * 06_17 Xeon 5200, 5400 series, Core 2 Quad Q9650
104 *
105 * 06_1C Atom
106 *
107 * 0F_00, 0F_01, 0F_02 Xeon, Xeon MP, Pentium 4
108 * 0F_03, 0F_04 Xeon, Xeon MP, Pentium 4, Pentium D
109 *
110 * 0F_06 Xeon 7100, 5000 Series, Xeon MP,
111 * Pentium 4, Pentium D
112 */
113
114/* Register processors bits */
115enum cpu_processor_bit {
116 CPU_NONE,
117/* Intel */
118 CPU_INTEL_PENTIUM_BIT,
119 CPU_INTEL_P6_BIT,
120 CPU_INTEL_PENTIUM_M_BIT,
121 CPU_INTEL_CORE_BIT,
122 CPU_INTEL_CORE2_BIT,
123 CPU_INTEL_ATOM_BIT,
124 CPU_INTEL_XEON_P4_BIT,
125 CPU_INTEL_XEON_MP_BIT,
126};
127
128#define CPU_ALL (~0) /* Select all CPUs */
129
130#define CPU_INTEL_PENTIUM (1 << CPU_INTEL_PENTIUM_BIT)
131#define CPU_INTEL_P6 (1 << CPU_INTEL_P6_BIT)
132#define CPU_INTEL_PENTIUM_M (1 << CPU_INTEL_PENTIUM_M_BIT)
133#define CPU_INTEL_CORE (1 << CPU_INTEL_CORE_BIT)
134#define CPU_INTEL_CORE2 (1 << CPU_INTEL_CORE2_BIT)
135#define CPU_INTEL_ATOM (1 << CPU_INTEL_ATOM_BIT)
136#define CPU_INTEL_XEON_P4 (1 << CPU_INTEL_XEON_P4_BIT)
137#define CPU_INTEL_XEON_MP (1 << CPU_INTEL_XEON_MP_BIT)
138
139#define CPU_INTEL_PX (CPU_INTEL_P6 | CPU_INTEL_PENTIUM_M)
140#define CPU_INTEL_COREX (CPU_INTEL_CORE | CPU_INTEL_CORE2)
141#define CPU_INTEL_XEON (CPU_INTEL_XEON_P4 | CPU_INTEL_XEON_MP)
142#define CPU_CO_AT (CPU_INTEL_CORE | CPU_INTEL_ATOM)
143#define CPU_C2_AT (CPU_INTEL_CORE2 | CPU_INTEL_ATOM)
144#define CPU_CX_AT (CPU_INTEL_COREX | CPU_INTEL_ATOM)
145#define CPU_CX_XE (CPU_INTEL_COREX | CPU_INTEL_XEON)
146#define CPU_P6_XE (CPU_INTEL_P6 | CPU_INTEL_XEON)
147#define CPU_PM_CO_AT (CPU_INTEL_PENTIUM_M | CPU_CO_AT)
148#define CPU_C2_AT_XE (CPU_C2_AT | CPU_INTEL_XEON)
149#define CPU_CX_AT_XE (CPU_CX_AT | CPU_INTEL_XEON)
150#define CPU_P6_CX_AT (CPU_INTEL_P6 | CPU_CX_AT)
151#define CPU_P6_CX_XE (CPU_P6_XE | CPU_INTEL_COREX)
152#define CPU_P6_CX_AT_XE (CPU_INTEL_P6 | CPU_CX_AT_XE)
153#define CPU_PM_CX_AT_XE (CPU_INTEL_PENTIUM_M | CPU_CX_AT_XE)
154#define CPU_PM_CX_AT (CPU_INTEL_PENTIUM_M | CPU_CX_AT)
155#define CPU_PM_CX_XE (CPU_INTEL_PENTIUM_M | CPU_CX_XE)
156#define CPU_PX_CX_AT (CPU_INTEL_PX | CPU_CX_AT)
157#define CPU_PX_CX_AT_XE (CPU_INTEL_PX | CPU_CX_AT_XE)
158
159/* Select all Intel CPUs*/
160#define CPU_INTEL_ALL (CPU_INTEL_PENTIUM | CPU_PX_CX_AT_XE)
161
162#define MAX_CPU_FILES 512
163
164struct cpu_private {
165 unsigned cpu;
166 unsigned type;
167 unsigned reg;
168 unsigned file;
169};
170
171struct cpu_debug_base {
172 char *name; /* Register name */
173 unsigned flag; /* Register flag */
174};
175
176struct cpu_cpuX_base {
177 struct dentry *dentry; /* Register dentry */
178 int init; /* Register index file */
179};
180
181struct cpu_file_base {
182 char *name; /* Register file name */
183 unsigned flag; /* Register file flag */
184};
185
186struct cpu_debug_range {
187 unsigned min; /* Register range min */
188 unsigned max; /* Register range max */
189 unsigned flag; /* Supported flags */
190 unsigned model; /* Supported models */
191};
192
193#endif /* _ASM_X86_CPU_DEBUG_H */
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 82db7f45e2de..d4356f8b7522 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -14,6 +14,8 @@ obj-y += vmware.o hypervisor.o
14obj-$(CONFIG_X86_32) += bugs.o cmpxchg.o 14obj-$(CONFIG_X86_32) += bugs.o cmpxchg.o
15obj-$(CONFIG_X86_64) += bugs_64.o 15obj-$(CONFIG_X86_64) += bugs_64.o
16 16
17obj-$(CONFIG_X86_CPU_DEBUG) += cpu_debug.o
18
17obj-$(CONFIG_CPU_SUP_INTEL) += intel.o 19obj-$(CONFIG_CPU_SUP_INTEL) += intel.o
18obj-$(CONFIG_CPU_SUP_AMD) += amd.o 20obj-$(CONFIG_CPU_SUP_AMD) += amd.o
19obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o 21obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o
diff --git a/arch/x86/kernel/cpu/cpu_debug.c b/arch/x86/kernel/cpu/cpu_debug.c
new file mode 100755
index 000000000000..0bdf4daba205
--- /dev/null
+++ b/arch/x86/kernel/cpu/cpu_debug.c
@@ -0,0 +1,784 @@
1/*
2 * CPU x86 architecture debug code
3 *
4 * Copyright(C) 2009 Jaswinder Singh Rajput
5 *
6 * For licencing details see kernel-base/COPYING
7 */
8
9#include <linux/interrupt.h>
10#include <linux/compiler.h>
11#include <linux/seq_file.h>
12#include <linux/debugfs.h>
13#include <linux/kprobes.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/percpu.h>
17#include <linux/signal.h>
18#include <linux/errno.h>
19#include <linux/sched.h>
20#include <linux/types.h>
21#include <linux/init.h>
22#include <linux/slab.h>
23#include <linux/smp.h>
24
25#include <asm/cpu_debug.h>
26#include <asm/system.h>
27#include <asm/traps.h>
28#include <asm/apic.h>
29#include <asm/desc.h>
30
31static DEFINE_PER_CPU(struct cpu_cpuX_base, cpu_arr[CPU_REG_ALL_BIT]);
32static DEFINE_PER_CPU(struct cpu_private *, priv_arr[MAX_CPU_FILES]);
33static DEFINE_PER_CPU(unsigned, cpu_modelflag);
34static DEFINE_PER_CPU(int, cpu_priv_count);
35static DEFINE_PER_CPU(unsigned, cpu_model);
36
37static DEFINE_MUTEX(cpu_debug_lock);
38
39static struct dentry *cpu_debugfs_dir;
40
41static struct cpu_debug_base cpu_base[] = {
42 { "mc", CPU_MC }, /* Machine Check */
43 { "monitor", CPU_MONITOR }, /* Monitor */
44 { "time", CPU_TIME }, /* Time */
45 { "pmc", CPU_PMC }, /* Performance Monitor */
46 { "platform", CPU_PLATFORM }, /* Platform */
47 { "apic", CPU_APIC }, /* APIC */
48 { "poweron", CPU_POWERON }, /* Power-on */
49 { "control", CPU_CONTROL }, /* Control */
50 { "features", CPU_FEATURES }, /* Features control */
51 { "lastbranch", CPU_LBRANCH }, /* Last Branch */
52 { "bios", CPU_BIOS }, /* BIOS */
53 { "freq", CPU_FREQ }, /* Frequency */
54 { "mtrr", CPU_MTRR }, /* MTRR */
55 { "perf", CPU_PERF }, /* Performance */
56 { "cache", CPU_CACHE }, /* Cache */
57 { "sysenter", CPU_SYSENTER }, /* Sysenter */
58 { "therm", CPU_THERM }, /* Thermal */
59 { "misc", CPU_MISC }, /* Miscellaneous */
60 { "debug", CPU_DEBUG }, /* Debug */
61 { "pat", CPU_PAT }, /* PAT */
62 { "vmx", CPU_VMX }, /* VMX */
63 { "call", CPU_CALL }, /* System Call */
64 { "base", CPU_BASE }, /* BASE Address */
65 { "smm", CPU_SMM }, /* System mgmt mode */
66 { "svm", CPU_SVM }, /*Secure Virtial Machine*/
67 { "osvm", CPU_OSVM }, /* OS-Visible Workaround*/
68 { "tss", CPU_TSS }, /* Task Stack Segment */
69 { "cr", CPU_CR }, /* Control Registers */
70 { "dt", CPU_DT }, /* Descriptor Table */
71 { "registers", CPU_REG_ALL }, /* Select all Registers */
72};
73
74static struct cpu_file_base cpu_file[] = {
75 { "index", CPU_REG_ALL }, /* index */
76 { "value", CPU_REG_ALL }, /* value */
77};
78
79/* Intel Registers Range */
80static struct cpu_debug_range cpu_intel_range[] = {
81 { 0x00000000, 0x00000001, CPU_MC, CPU_INTEL_ALL },
82 { 0x00000006, 0x00000007, CPU_MONITOR, CPU_CX_AT_XE },
83 { 0x00000010, 0x00000010, CPU_TIME, CPU_INTEL_ALL },
84 { 0x00000011, 0x00000013, CPU_PMC, CPU_INTEL_PENTIUM },
85 { 0x00000017, 0x00000017, CPU_PLATFORM, CPU_PX_CX_AT_XE },
86 { 0x0000001B, 0x0000001B, CPU_APIC, CPU_P6_CX_AT_XE },
87
88 { 0x0000002A, 0x0000002A, CPU_POWERON, CPU_PX_CX_AT_XE },
89 { 0x0000002B, 0x0000002B, CPU_POWERON, CPU_INTEL_XEON },
90 { 0x0000002C, 0x0000002C, CPU_FREQ, CPU_INTEL_XEON },
91 { 0x0000003A, 0x0000003A, CPU_CONTROL, CPU_CX_AT_XE },
92
93 { 0x00000040, 0x00000043, CPU_LBRANCH, CPU_PM_CX_AT_XE },
94 { 0x00000044, 0x00000047, CPU_LBRANCH, CPU_PM_CO_AT },
95 { 0x00000060, 0x00000063, CPU_LBRANCH, CPU_C2_AT },
96 { 0x00000064, 0x00000067, CPU_LBRANCH, CPU_INTEL_ATOM },
97
98 { 0x00000079, 0x00000079, CPU_BIOS, CPU_P6_CX_AT_XE },
99 { 0x00000088, 0x0000008A, CPU_CACHE, CPU_INTEL_P6 },
100 { 0x0000008B, 0x0000008B, CPU_BIOS, CPU_P6_CX_AT_XE },
101 { 0x0000009B, 0x0000009B, CPU_MONITOR, CPU_INTEL_XEON },
102
103 { 0x000000C1, 0x000000C2, CPU_PMC, CPU_P6_CX_AT },
104 { 0x000000CD, 0x000000CD, CPU_FREQ, CPU_CX_AT },
105 { 0x000000E7, 0x000000E8, CPU_PERF, CPU_CX_AT },
106 { 0x000000FE, 0x000000FE, CPU_MTRR, CPU_P6_CX_XE },
107
108 { 0x00000116, 0x00000116, CPU_CACHE, CPU_INTEL_P6 },
109 { 0x00000118, 0x00000118, CPU_CACHE, CPU_INTEL_P6 },
110 { 0x00000119, 0x00000119, CPU_CACHE, CPU_INTEL_PX },
111 { 0x0000011A, 0x0000011B, CPU_CACHE, CPU_INTEL_P6 },
112 { 0x0000011E, 0x0000011E, CPU_CACHE, CPU_PX_CX_AT },
113
114 { 0x00000174, 0x00000176, CPU_SYSENTER, CPU_P6_CX_AT_XE },
115 { 0x00000179, 0x0000017A, CPU_MC, CPU_PX_CX_AT_XE },
116 { 0x0000017B, 0x0000017B, CPU_MC, CPU_P6_XE },
117 { 0x00000186, 0x00000187, CPU_PMC, CPU_P6_CX_AT },
118 { 0x00000198, 0x00000199, CPU_PERF, CPU_PM_CX_AT_XE },
119 { 0x0000019A, 0x0000019A, CPU_TIME, CPU_PM_CX_AT_XE },
120 { 0x0000019B, 0x0000019D, CPU_THERM, CPU_PM_CX_AT_XE },
121 { 0x000001A0, 0x000001A0, CPU_MISC, CPU_PM_CX_AT_XE },
122
123 { 0x000001C9, 0x000001C9, CPU_LBRANCH, CPU_PM_CX_AT },
124 { 0x000001D7, 0x000001D8, CPU_LBRANCH, CPU_INTEL_XEON },
125 { 0x000001D9, 0x000001D9, CPU_DEBUG, CPU_CX_AT_XE },
126 { 0x000001DA, 0x000001DA, CPU_LBRANCH, CPU_INTEL_XEON },
127 { 0x000001DB, 0x000001DB, CPU_LBRANCH, CPU_P6_XE },
128 { 0x000001DC, 0x000001DC, CPU_LBRANCH, CPU_INTEL_P6 },
129 { 0x000001DD, 0x000001DE, CPU_LBRANCH, CPU_PX_CX_AT_XE },
130 { 0x000001E0, 0x000001E0, CPU_LBRANCH, CPU_INTEL_P6 },
131
132 { 0x00000200, 0x0000020F, CPU_MTRR, CPU_P6_CX_XE },
133 { 0x00000250, 0x00000250, CPU_MTRR, CPU_P6_CX_XE },
134 { 0x00000258, 0x00000259, CPU_MTRR, CPU_P6_CX_XE },
135 { 0x00000268, 0x0000026F, CPU_MTRR, CPU_P6_CX_XE },
136 { 0x00000277, 0x00000277, CPU_PAT, CPU_C2_AT_XE },
137 { 0x000002FF, 0x000002FF, CPU_MTRR, CPU_P6_CX_XE },
138
139 { 0x00000300, 0x00000308, CPU_PMC, CPU_INTEL_XEON },
140 { 0x00000309, 0x0000030B, CPU_PMC, CPU_C2_AT_XE },
141 { 0x0000030C, 0x00000311, CPU_PMC, CPU_INTEL_XEON },
142 { 0x00000345, 0x00000345, CPU_PMC, CPU_C2_AT },
143 { 0x00000360, 0x00000371, CPU_PMC, CPU_INTEL_XEON },
144 { 0x0000038D, 0x00000390, CPU_PMC, CPU_C2_AT },
145 { 0x000003A0, 0x000003BE, CPU_PMC, CPU_INTEL_XEON },
146 { 0x000003C0, 0x000003CD, CPU_PMC, CPU_INTEL_XEON },
147 { 0x000003E0, 0x000003E1, CPU_PMC, CPU_INTEL_XEON },
148 { 0x000003F0, 0x000003F0, CPU_PMC, CPU_INTEL_XEON },
149 { 0x000003F1, 0x000003F1, CPU_PMC, CPU_C2_AT_XE },
150 { 0x000003F2, 0x000003F2, CPU_PMC, CPU_INTEL_XEON },
151
152 { 0x00000400, 0x00000402, CPU_MC, CPU_PM_CX_AT_XE },
153 { 0x00000403, 0x00000403, CPU_MC, CPU_INTEL_XEON },
154 { 0x00000404, 0x00000406, CPU_MC, CPU_PM_CX_AT_XE },
155 { 0x00000407, 0x00000407, CPU_MC, CPU_INTEL_XEON },
156 { 0x00000408, 0x0000040A, CPU_MC, CPU_PM_CX_AT_XE },
157 { 0x0000040B, 0x0000040B, CPU_MC, CPU_INTEL_XEON },
158 { 0x0000040C, 0x0000040E, CPU_MC, CPU_PM_CX_XE },
159 { 0x0000040F, 0x0000040F, CPU_MC, CPU_INTEL_XEON },
160 { 0x00000410, 0x00000412, CPU_MC, CPU_PM_CX_AT_XE },
161 { 0x00000413, 0x00000417, CPU_MC, CPU_CX_AT_XE },
162 { 0x00000480, 0x0000048B, CPU_VMX, CPU_CX_AT_XE },
163
164 { 0x00000600, 0x00000600, CPU_DEBUG, CPU_PM_CX_AT_XE },
165 { 0x00000680, 0x0000068F, CPU_LBRANCH, CPU_INTEL_XEON },
166 { 0x000006C0, 0x000006CF, CPU_LBRANCH, CPU_INTEL_XEON },
167
168 { 0x000107CC, 0x000107D3, CPU_PMC, CPU_INTEL_XEON_MP },
169
170 { 0xC0000080, 0xC0000080, CPU_FEATURES, CPU_INTEL_XEON },
171 { 0xC0000081, 0xC0000082, CPU_CALL, CPU_INTEL_XEON },
172 { 0xC0000084, 0xC0000084, CPU_CALL, CPU_INTEL_XEON },
173 { 0xC0000100, 0xC0000102, CPU_BASE, CPU_INTEL_XEON },
174};
175
176/* AMD Registers Range */
177static struct cpu_debug_range cpu_amd_range[] = {
178 { 0x00000010, 0x00000010, CPU_TIME, CPU_ALL, },
179 { 0x0000001B, 0x0000001B, CPU_APIC, CPU_ALL, },
180 { 0x000000FE, 0x000000FE, CPU_MTRR, CPU_ALL, },
181
182 { 0x00000174, 0x00000176, CPU_SYSENTER, CPU_ALL, },
183 { 0x00000179, 0x0000017A, CPU_MC, CPU_ALL, },
184 { 0x0000017B, 0x0000017B, CPU_MC, CPU_ALL, },
185 { 0x000001D9, 0x000001D9, CPU_DEBUG, CPU_ALL, },
186 { 0x000001DB, 0x000001DE, CPU_LBRANCH, CPU_ALL, },
187
188 { 0x00000200, 0x0000020F, CPU_MTRR, CPU_ALL, },
189 { 0x00000250, 0x00000250, CPU_MTRR, CPU_ALL, },
190 { 0x00000258, 0x00000259, CPU_MTRR, CPU_ALL, },
191 { 0x00000268, 0x0000026F, CPU_MTRR, CPU_ALL, },
192 { 0x00000277, 0x00000277, CPU_PAT, CPU_ALL, },
193 { 0x000002FF, 0x000002FF, CPU_MTRR, CPU_ALL, },
194
195 { 0x00000400, 0x00000417, CPU_MC, CPU_ALL, },
196
197 { 0xC0000080, 0xC0000080, CPU_FEATURES, CPU_ALL, },
198 { 0xC0000081, 0xC0000084, CPU_CALL, CPU_ALL, },
199 { 0xC0000100, 0xC0000102, CPU_BASE, CPU_ALL, },
200 { 0xC0000103, 0xC0000103, CPU_TIME, CPU_ALL, },
201
202 { 0xC0000408, 0xC000040A, CPU_MC, CPU_ALL, },
203
204 { 0xc0010000, 0xc0010007, CPU_PMC, CPU_ALL, },
205 { 0xc0010010, 0xc0010010, CPU_MTRR, CPU_ALL, },
206 { 0xc0010016, 0xc001001A, CPU_MTRR, CPU_ALL, },
207 { 0xc001001D, 0xc001001D, CPU_MTRR, CPU_ALL, },
208 { 0xc0010030, 0xc0010035, CPU_BIOS, CPU_ALL, },
209 { 0xc0010056, 0xc0010056, CPU_SMM, CPU_ALL, },
210 { 0xc0010061, 0xc0010063, CPU_SMM, CPU_ALL, },
211 { 0xc0010074, 0xc0010074, CPU_MC, CPU_ALL, },
212 { 0xc0010111, 0xc0010113, CPU_SMM, CPU_ALL, },
213 { 0xc0010114, 0xc0010118, CPU_SVM, CPU_ALL, },
214 { 0xc0010119, 0xc001011A, CPU_SMM, CPU_ALL, },
215 { 0xc0010140, 0xc0010141, CPU_OSVM, CPU_ALL, },
216 { 0xc0010156, 0xc0010156, CPU_SMM, CPU_ALL, },
217};
218
219
220static int get_cpu_modelflag(unsigned cpu)
221{
222 int flag;
223
224 switch (per_cpu(cpu_model, cpu)) {
225 /* Intel */
226 case 0x0501:
227 case 0x0502:
228 case 0x0504:
229 flag = CPU_INTEL_PENTIUM;
230 break;
231 case 0x0601:
232 case 0x0603:
233 case 0x0605:
234 case 0x0607:
235 case 0x0608:
236 case 0x060A:
237 case 0x060B:
238 flag = CPU_INTEL_P6;
239 break;
240 case 0x0609:
241 case 0x060D:
242 flag = CPU_INTEL_PENTIUM_M;
243 break;
244 case 0x060E:
245 flag = CPU_INTEL_CORE;
246 break;
247 case 0x060F:
248 case 0x0617:
249 flag = CPU_INTEL_CORE2;
250 break;
251 case 0x061C:
252 flag = CPU_INTEL_ATOM;
253 break;
254 case 0x0F00:
255 case 0x0F01:
256 case 0x0F02:
257 case 0x0F03:
258 case 0x0F04:
259 flag = CPU_INTEL_XEON_P4;
260 break;
261 case 0x0F06:
262 flag = CPU_INTEL_XEON_MP;
263 break;
264 default:
265 flag = CPU_NONE;
266 break;
267 }
268
269 return flag;
270}
271
272static int get_cpu_range_count(unsigned cpu)
273{
274 int index;
275
276 switch (per_cpu(cpu_model, cpu) >> 16) {
277 case X86_VENDOR_INTEL:
278 index = ARRAY_SIZE(cpu_intel_range);
279 break;
280 case X86_VENDOR_AMD:
281 index = ARRAY_SIZE(cpu_amd_range);
282 break;
283 default:
284 index = 0;
285 break;
286 }
287
288 return index;
289}
290
291static int is_typeflag_valid(unsigned cpu, unsigned flag)
292{
293 unsigned vendor, modelflag;
294 int i, index;
295
296 /* Standard Registers should be always valid */
297 if (flag >= CPU_TSS)
298 return 1;
299
300 modelflag = per_cpu(cpu_modelflag, cpu);
301 vendor = per_cpu(cpu_model, cpu) >> 16;
302 index = get_cpu_range_count(cpu);
303
304 for (i = 0; i < index; i++) {
305 switch (vendor) {
306 case X86_VENDOR_INTEL:
307 if ((cpu_intel_range[i].model & modelflag) &&
308 (cpu_intel_range[i].flag & flag))
309 return 1;
310 break;
311 case X86_VENDOR_AMD:
312 if (cpu_amd_range[i].flag & flag)
313 return 1;
314 break;
315 }
316 }
317
318 /* Invalid */
319 return 0;
320}
321
322static unsigned get_cpu_range(unsigned cpu, unsigned *min, unsigned *max,
323 int index, unsigned flag)
324{
325 unsigned modelflag;
326
327 modelflag = per_cpu(cpu_modelflag, cpu);
328 *max = 0;
329 switch (per_cpu(cpu_model, cpu) >> 16) {
330 case X86_VENDOR_INTEL:
331 if ((cpu_intel_range[index].model & modelflag) &&
332 (cpu_intel_range[index].flag & flag)) {
333 *min = cpu_intel_range[index].min;
334 *max = cpu_intel_range[index].max;
335 }
336 break;
337 case X86_VENDOR_AMD:
338 if (cpu_amd_range[index].flag & flag) {
339 *min = cpu_amd_range[index].min;
340 *max = cpu_amd_range[index].max;
341 }
342 break;
343 }
344
345 return *max;
346}
347
348/* This function can also be called with seq = NULL for printk */
349static void print_cpu_data(struct seq_file *seq, unsigned type,
350 u32 low, u32 high)
351{
352 struct cpu_private *priv;
353 u64 val = high;
354
355 if (seq) {
356 priv = seq->private;
357 if (priv->file) {
358 val = (val << 32) | low;
359 seq_printf(seq, "0x%llx\n", val);
360 } else
361 seq_printf(seq, " %08x: %08x_%08x\n",
362 type, high, low);
363 } else
364 printk(KERN_INFO " %08x: %08x_%08x\n", type, high, low);
365}
366
367/* This function can also be called with seq = NULL for printk */
368static void print_msr(struct seq_file *seq, unsigned cpu, unsigned flag)
369{
370 unsigned msr, msr_min, msr_max;
371 struct cpu_private *priv;
372 u32 low, high;
373 int i, range;
374
375 if (seq) {
376 priv = seq->private;
377 if (priv->file) {
378 if (!rdmsr_safe_on_cpu(priv->cpu, priv->reg,
379 &low, &high))
380 print_cpu_data(seq, priv->reg, low, high);
381 return;
382 }
383 }
384
385 range = get_cpu_range_count(cpu);
386
387 for (i = 0; i < range; i++) {
388 if (!get_cpu_range(cpu, &msr_min, &msr_max, i, flag))
389 continue;
390
391 for (msr = msr_min; msr <= msr_max; msr++) {
392 if (rdmsr_safe_on_cpu(cpu, msr, &low, &high))
393 continue;
394 print_cpu_data(seq, msr, low, high);
395 }
396 }
397}
398
399static void print_tss(void *arg)
400{
401 struct pt_regs *regs = task_pt_regs(current);
402 struct seq_file *seq = arg;
403 unsigned int seg;
404
405 seq_printf(seq, " RAX\t: %016lx\n", regs->ax);
406 seq_printf(seq, " RBX\t: %016lx\n", regs->bx);
407 seq_printf(seq, " RCX\t: %016lx\n", regs->cx);
408 seq_printf(seq, " RDX\t: %016lx\n", regs->dx);
409
410 seq_printf(seq, " RSI\t: %016lx\n", regs->si);
411 seq_printf(seq, " RDI\t: %016lx\n", regs->di);
412 seq_printf(seq, " RBP\t: %016lx\n", regs->bp);
413 seq_printf(seq, " ESP\t: %016lx\n", regs->sp);
414
415#ifdef CONFIG_X86_64
416 seq_printf(seq, " R08\t: %016lx\n", regs->r8);
417 seq_printf(seq, " R09\t: %016lx\n", regs->r9);
418 seq_printf(seq, " R10\t: %016lx\n", regs->r10);
419 seq_printf(seq, " R11\t: %016lx\n", regs->r11);
420 seq_printf(seq, " R12\t: %016lx\n", regs->r12);
421 seq_printf(seq, " R13\t: %016lx\n", regs->r13);
422 seq_printf(seq, " R14\t: %016lx\n", regs->r14);
423 seq_printf(seq, " R15\t: %016lx\n", regs->r15);
424#endif
425
426 asm("movl %%cs,%0" : "=r" (seg));
427 seq_printf(seq, " CS\t: %04x\n", seg);
428 asm("movl %%ds,%0" : "=r" (seg));
429 seq_printf(seq, " DS\t: %04x\n", seg);
430 seq_printf(seq, " SS\t: %04lx\n", regs->ss);
431 asm("movl %%es,%0" : "=r" (seg));
432 seq_printf(seq, " ES\t: %04x\n", seg);
433 asm("movl %%fs,%0" : "=r" (seg));
434 seq_printf(seq, " FS\t: %04x\n", seg);
435 asm("movl %%gs,%0" : "=r" (seg));
436 seq_printf(seq, " GS\t: %04x\n", seg);
437
438 seq_printf(seq, " EFLAGS\t: %016lx\n", regs->flags);
439
440 seq_printf(seq, " EIP\t: %016lx\n", regs->ip);
441}
442
443static void print_cr(void *arg)
444{
445 struct seq_file *seq = arg;
446
447 seq_printf(seq, " cr0\t: %016lx\n", read_cr0());
448 seq_printf(seq, " cr2\t: %016lx\n", read_cr2());
449 seq_printf(seq, " cr3\t: %016lx\n", read_cr3());
450 seq_printf(seq, " cr4\t: %016lx\n", read_cr4_safe());
451#ifdef CONFIG_X86_64
452 seq_printf(seq, " cr8\t: %016lx\n", read_cr8());
453#endif
454}
455
456static void print_desc_ptr(char *str, struct seq_file *seq, struct desc_ptr dt)
457{
458 seq_printf(seq, " %s\t: %016llx\n", str, (u64)(dt.address | dt.size));
459}
460
461static void print_dt(void *seq)
462{
463 struct desc_ptr dt;
464 unsigned long ldt;
465
466 /* IDT */
467 store_idt((struct desc_ptr *)&dt);
468 print_desc_ptr("IDT", seq, dt);
469
470 /* GDT */
471 store_gdt((struct desc_ptr *)&dt);
472 print_desc_ptr("GDT", seq, dt);
473
474 /* LDT */
475 store_ldt(ldt);
476 seq_printf(seq, " LDT\t: %016lx\n", ldt);
477
478 /* TR */
479 store_tr(ldt);
480 seq_printf(seq, " TR\t: %016lx\n", ldt);
481}
482
483static void print_dr(void *arg)
484{
485 struct seq_file *seq = arg;
486 unsigned long dr;
487 int i;
488
489 for (i = 0; i < 8; i++) {
490 /* Ignore db4, db5 */
491 if ((i == 4) || (i == 5))
492 continue;
493 get_debugreg(dr, i);
494 seq_printf(seq, " dr%d\t: %016lx\n", i, dr);
495 }
496
497 seq_printf(seq, "\n MSR\t:\n");
498}
499
500static void print_apic(void *arg)
501{
502 struct seq_file *seq = arg;
503
504#ifdef CONFIG_X86_LOCAL_APIC
505 seq_printf(seq, " LAPIC\t:\n");
506 seq_printf(seq, " ID\t\t: %08x\n", apic_read(APIC_ID) >> 24);
507 seq_printf(seq, " LVR\t\t: %08x\n", apic_read(APIC_LVR));
508 seq_printf(seq, " TASKPRI\t: %08x\n", apic_read(APIC_TASKPRI));
509 seq_printf(seq, " ARBPRI\t\t: %08x\n", apic_read(APIC_ARBPRI));
510 seq_printf(seq, " PROCPRI\t: %08x\n", apic_read(APIC_PROCPRI));
511 seq_printf(seq, " LDR\t\t: %08x\n", apic_read(APIC_LDR));
512 seq_printf(seq, " DFR\t\t: %08x\n", apic_read(APIC_DFR));
513 seq_printf(seq, " SPIV\t\t: %08x\n", apic_read(APIC_SPIV));
514 seq_printf(seq, " ISR\t\t: %08x\n", apic_read(APIC_ISR));
515 seq_printf(seq, " ESR\t\t: %08x\n", apic_read(APIC_ESR));
516 seq_printf(seq, " ICR\t\t: %08x\n", apic_read(APIC_ICR));
517 seq_printf(seq, " ICR2\t\t: %08x\n", apic_read(APIC_ICR2));
518 seq_printf(seq, " LVTT\t\t: %08x\n", apic_read(APIC_LVTT));
519 seq_printf(seq, " LVTTHMR\t: %08x\n", apic_read(APIC_LVTTHMR));
520 seq_printf(seq, " LVTPC\t\t: %08x\n", apic_read(APIC_LVTPC));
521 seq_printf(seq, " LVT0\t\t: %08x\n", apic_read(APIC_LVT0));
522 seq_printf(seq, " LVT1\t\t: %08x\n", apic_read(APIC_LVT1));
523 seq_printf(seq, " LVTERR\t\t: %08x\n", apic_read(APIC_LVTERR));
524 seq_printf(seq, " TMICT\t\t: %08x\n", apic_read(APIC_TMICT));
525 seq_printf(seq, " TMCCT\t\t: %08x\n", apic_read(APIC_TMCCT));
526 seq_printf(seq, " TDCR\t\t: %08x\n", apic_read(APIC_TDCR));
527#endif /* CONFIG_X86_LOCAL_APIC */
528
529 seq_printf(seq, "\n MSR\t:\n");
530}
531
532static int cpu_seq_show(struct seq_file *seq, void *v)
533{
534 struct cpu_private *priv = seq->private;
535
536 if (priv == NULL)
537 return -EINVAL;
538
539 switch (cpu_base[priv->type].flag) {
540 case CPU_TSS:
541 smp_call_function_single(priv->cpu, print_tss, seq, 1);
542 break;
543 case CPU_CR:
544 smp_call_function_single(priv->cpu, print_cr, seq, 1);
545 break;
546 case CPU_DT:
547 smp_call_function_single(priv->cpu, print_dt, seq, 1);
548 break;
549 case CPU_DEBUG:
550 if (priv->file == CPU_INDEX_BIT)
551 smp_call_function_single(priv->cpu, print_dr, seq, 1);
552 print_msr(seq, priv->cpu, cpu_base[priv->type].flag);
553 break;
554 case CPU_APIC:
555 if (priv->file == CPU_INDEX_BIT)
556 smp_call_function_single(priv->cpu, print_apic, seq, 1);
557 print_msr(seq, priv->cpu, cpu_base[priv->type].flag);
558 break;
559
560 default:
561 print_msr(seq, priv->cpu, cpu_base[priv->type].flag);
562 break;
563 }
564 seq_printf(seq, "\n");
565
566 return 0;
567}
568
569static void *cpu_seq_start(struct seq_file *seq, loff_t *pos)
570{
571 if (*pos == 0) /* One time is enough ;-) */
572 return seq;
573
574 return NULL;
575}
576
577static void *cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
578{
579 (*pos)++;
580
581 return cpu_seq_start(seq, pos);
582}
583
584static void cpu_seq_stop(struct seq_file *seq, void *v)
585{
586}
587
588static const struct seq_operations cpu_seq_ops = {
589 .start = cpu_seq_start,
590 .next = cpu_seq_next,
591 .stop = cpu_seq_stop,
592 .show = cpu_seq_show,
593};
594
595static int cpu_seq_open(struct inode *inode, struct file *file)
596{
597 struct cpu_private *priv = inode->i_private;
598 struct seq_file *seq;
599 int err;
600
601 err = seq_open(file, &cpu_seq_ops);
602 if (!err) {
603 seq = file->private_data;
604 seq->private = priv;
605 }
606
607 return err;
608}
609
610static const struct file_operations cpu_fops = {
611 .open = cpu_seq_open,
612 .read = seq_read,
613 .llseek = seq_lseek,
614 .release = seq_release,
615};
616
617static int cpu_create_file(unsigned cpu, unsigned type, unsigned reg,
618 unsigned file, struct dentry *dentry)
619{
620 struct cpu_private *priv = NULL;
621
622 /* Already intialized */
623 if (file == CPU_INDEX_BIT)
624 if (per_cpu(cpu_arr[type].init, cpu))
625 return 0;
626
627 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
628 if (priv == NULL)
629 return -ENOMEM;
630
631 priv->cpu = cpu;
632 priv->type = type;
633 priv->reg = reg;
634 priv->file = file;
635 mutex_lock(&cpu_debug_lock);
636 per_cpu(priv_arr[type], cpu) = priv;
637 per_cpu(cpu_priv_count, cpu)++;
638 mutex_unlock(&cpu_debug_lock);
639
640 if (file)
641 debugfs_create_file(cpu_file[file].name, S_IRUGO,
642 dentry, (void *)priv, &cpu_fops);
643 else {
644 debugfs_create_file(cpu_base[type].name, S_IRUGO,
645 per_cpu(cpu_arr[type].dentry, cpu),
646 (void *)priv, &cpu_fops);
647 mutex_lock(&cpu_debug_lock);
648 per_cpu(cpu_arr[type].init, cpu) = 1;
649 mutex_unlock(&cpu_debug_lock);
650 }
651
652 return 0;
653}
654
655static int cpu_init_regfiles(unsigned cpu, unsigned int type, unsigned reg,
656 struct dentry *dentry)
657{
658 unsigned file;
659 int err = 0;
660
661 for (file = 0; file < ARRAY_SIZE(cpu_file); file++) {
662 err = cpu_create_file(cpu, type, reg, file, dentry);
663 if (err)
664 return err;
665 }
666
667 return err;
668}
669
670static int cpu_init_msr(unsigned cpu, unsigned type, struct dentry *dentry)
671{
672 struct dentry *cpu_dentry = NULL;
673 unsigned reg, reg_min, reg_max;
674 int i, range, err = 0;
675 char reg_dir[12];
676 u32 low, high;
677
678 range = get_cpu_range_count(cpu);
679
680 for (i = 0; i < range; i++) {
681 if (!get_cpu_range(cpu, &reg_min, &reg_max, i,
682 cpu_base[type].flag))
683 continue;
684
685 for (reg = reg_min; reg <= reg_max; reg++) {
686 if (rdmsr_safe_on_cpu(cpu, reg, &low, &high))
687 continue;
688
689 sprintf(reg_dir, "0x%x", reg);
690 cpu_dentry = debugfs_create_dir(reg_dir, dentry);
691 err = cpu_init_regfiles(cpu, type, reg, cpu_dentry);
692 if (err)
693 return err;
694 }
695 }
696
697 return err;
698}
699
700static int cpu_init_allreg(unsigned cpu, struct dentry *dentry)
701{
702 struct dentry *cpu_dentry = NULL;
703 unsigned type;
704 int err = 0;
705
706 for (type = 0; type < ARRAY_SIZE(cpu_base) - 1; type++) {
707 if (!is_typeflag_valid(cpu, cpu_base[type].flag))
708 continue;
709 cpu_dentry = debugfs_create_dir(cpu_base[type].name, dentry);
710 per_cpu(cpu_arr[type].dentry, cpu) = cpu_dentry;
711
712 if (type < CPU_TSS_BIT)
713 err = cpu_init_msr(cpu, type, cpu_dentry);
714 else
715 err = cpu_create_file(cpu, type, 0, CPU_INDEX_BIT,
716 cpu_dentry);
717 if (err)
718 return err;
719 }
720
721 return err;
722}
723
724static int cpu_init_cpu(void)
725{
726 struct dentry *cpu_dentry = NULL;
727 struct cpuinfo_x86 *cpui;
728 char cpu_dir[12];
729 unsigned cpu;
730 int err = 0;
731
732 for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
733 cpui = &cpu_data(cpu);
734 if (!cpu_has(cpui, X86_FEATURE_MSR))
735 continue;
736 per_cpu(cpu_model, cpu) = ((cpui->x86_vendor << 16) |
737 (cpui->x86 << 8) |
738 (cpui->x86_model));
739 per_cpu(cpu_modelflag, cpu) = get_cpu_modelflag(cpu);
740
741 sprintf(cpu_dir, "cpu%d", cpu);
742 cpu_dentry = debugfs_create_dir(cpu_dir, cpu_debugfs_dir);
743 err = cpu_init_allreg(cpu, cpu_dentry);
744
745 pr_info("cpu%d(%d) debug files %d\n",
746 cpu, nr_cpu_ids, per_cpu(cpu_priv_count, cpu));
747 if (per_cpu(cpu_priv_count, cpu) > MAX_CPU_FILES) {
748 pr_err("Register files count %d exceeds limit %d\n",
749 per_cpu(cpu_priv_count, cpu), MAX_CPU_FILES);
750 per_cpu(cpu_priv_count, cpu) = MAX_CPU_FILES;
751 err = -ENFILE;
752 }
753 if (err)
754 return err;
755 }
756
757 return err;
758}
759
760static int __init cpu_debug_init(void)
761{
762 cpu_debugfs_dir = debugfs_create_dir("cpu", arch_debugfs_dir);
763
764 return cpu_init_cpu();
765}
766
767static void __exit cpu_debug_exit(void)
768{
769 int i, cpu;
770
771 if (cpu_debugfs_dir)
772 debugfs_remove_recursive(cpu_debugfs_dir);
773
774 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
775 for (i = 0; i < per_cpu(cpu_priv_count, cpu); i++)
776 kfree(per_cpu(priv_arr[i], cpu));
777}
778
779module_init(cpu_debug_init);
780module_exit(cpu_debug_exit);
781
782MODULE_AUTHOR("Jaswinder Singh Rajput");
783MODULE_DESCRIPTION("CPU Debug module");
784MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-27 21:00:50 -0500