689 lines
18 KiB
C
689 lines
18 KiB
C
/*
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* CPU x86 architecture debug code
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*
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* Copyright(C) 2009 Jaswinder Singh Rajput
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*
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* For licencing details see kernel-base/COPYING
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*/
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#include <linux/interrupt.h>
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#include <linux/compiler.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/kprobes.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/percpu.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <asm/cpu_debug.h>
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#include <asm/paravirt.h>
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#include <asm/system.h>
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#include <asm/traps.h>
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#include <asm/apic.h>
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#include <asm/desc.h>
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static DEFINE_PER_CPU(struct cpu_cpuX_base [CPU_REG_ALL_BIT], cpu_arr);
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static DEFINE_PER_CPU(struct cpu_private * [MAX_CPU_FILES], priv_arr);
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static DEFINE_PER_CPU(int, cpu_priv_count);
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static DEFINE_MUTEX(cpu_debug_lock);
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static struct dentry *cpu_debugfs_dir;
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static struct cpu_debug_base cpu_base[] = {
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{ "mc", CPU_MC, 0 },
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{ "monitor", CPU_MONITOR, 0 },
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{ "time", CPU_TIME, 0 },
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{ "pmc", CPU_PMC, 1 },
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{ "platform", CPU_PLATFORM, 0 },
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{ "apic", CPU_APIC, 0 },
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{ "poweron", CPU_POWERON, 0 },
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{ "control", CPU_CONTROL, 0 },
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{ "features", CPU_FEATURES, 0 },
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{ "lastbranch", CPU_LBRANCH, 0 },
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{ "bios", CPU_BIOS, 0 },
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{ "freq", CPU_FREQ, 0 },
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{ "mtrr", CPU_MTRR, 0 },
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{ "perf", CPU_PERF, 0 },
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{ "cache", CPU_CACHE, 0 },
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{ "sysenter", CPU_SYSENTER, 0 },
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{ "therm", CPU_THERM, 0 },
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{ "misc", CPU_MISC, 0 },
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{ "debug", CPU_DEBUG, 0 },
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{ "pat", CPU_PAT, 0 },
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{ "vmx", CPU_VMX, 0 },
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{ "call", CPU_CALL, 0 },
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{ "base", CPU_BASE, 0 },
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{ "ver", CPU_VER, 0 },
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{ "conf", CPU_CONF, 0 },
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{ "smm", CPU_SMM, 0 },
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{ "svm", CPU_SVM, 0 },
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{ "osvm", CPU_OSVM, 0 },
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{ "tss", CPU_TSS, 0 },
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{ "cr", CPU_CR, 0 },
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{ "dt", CPU_DT, 0 },
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{ "registers", CPU_REG_ALL, 0 },
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};
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static struct cpu_file_base cpu_file[] = {
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{ "index", CPU_REG_ALL, 0 },
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{ "value", CPU_REG_ALL, 1 },
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};
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/* CPU Registers Range */
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static struct cpu_debug_range cpu_reg_range[] = {
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{ 0x00000000, 0x00000001, CPU_MC, },
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{ 0x00000006, 0x00000007, CPU_MONITOR, },
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{ 0x00000010, 0x00000010, CPU_TIME, },
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{ 0x00000011, 0x00000013, CPU_PMC, },
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{ 0x00000017, 0x00000017, CPU_PLATFORM, },
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{ 0x0000001B, 0x0000001B, CPU_APIC, },
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{ 0x0000002A, 0x0000002B, CPU_POWERON, },
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{ 0x0000002C, 0x0000002C, CPU_FREQ, },
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{ 0x0000003A, 0x0000003A, CPU_CONTROL, },
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{ 0x00000040, 0x00000047, CPU_LBRANCH, },
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{ 0x00000060, 0x00000067, CPU_LBRANCH, },
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{ 0x00000079, 0x00000079, CPU_BIOS, },
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{ 0x00000088, 0x0000008A, CPU_CACHE, },
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{ 0x0000008B, 0x0000008B, CPU_BIOS, },
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{ 0x0000009B, 0x0000009B, CPU_MONITOR, },
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{ 0x000000C1, 0x000000C4, CPU_PMC, },
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{ 0x000000CD, 0x000000CD, CPU_FREQ, },
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{ 0x000000E7, 0x000000E8, CPU_PERF, },
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{ 0x000000FE, 0x000000FE, CPU_MTRR, },
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{ 0x00000116, 0x0000011E, CPU_CACHE, },
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{ 0x00000174, 0x00000176, CPU_SYSENTER, },
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{ 0x00000179, 0x0000017B, CPU_MC, },
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{ 0x00000186, 0x00000189, CPU_PMC, },
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{ 0x00000198, 0x00000199, CPU_PERF, },
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{ 0x0000019A, 0x0000019A, CPU_TIME, },
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{ 0x0000019B, 0x0000019D, CPU_THERM, },
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{ 0x000001A0, 0x000001A0, CPU_MISC, },
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{ 0x000001C9, 0x000001C9, CPU_LBRANCH, },
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{ 0x000001D7, 0x000001D8, CPU_LBRANCH, },
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{ 0x000001D9, 0x000001D9, CPU_DEBUG, },
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{ 0x000001DA, 0x000001E0, CPU_LBRANCH, },
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{ 0x00000200, 0x0000020F, CPU_MTRR, },
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{ 0x00000250, 0x00000250, CPU_MTRR, },
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{ 0x00000258, 0x00000259, CPU_MTRR, },
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{ 0x00000268, 0x0000026F, CPU_MTRR, },
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{ 0x00000277, 0x00000277, CPU_PAT, },
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{ 0x000002FF, 0x000002FF, CPU_MTRR, },
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{ 0x00000300, 0x00000311, CPU_PMC, },
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{ 0x00000345, 0x00000345, CPU_PMC, },
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{ 0x00000360, 0x00000371, CPU_PMC, },
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{ 0x0000038D, 0x00000390, CPU_PMC, },
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{ 0x000003A0, 0x000003BE, CPU_PMC, },
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{ 0x000003C0, 0x000003CD, CPU_PMC, },
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{ 0x000003E0, 0x000003E1, CPU_PMC, },
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{ 0x000003F0, 0x000003F2, CPU_PMC, },
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{ 0x00000400, 0x00000417, CPU_MC, },
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{ 0x00000480, 0x0000048B, CPU_VMX, },
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{ 0x00000600, 0x00000600, CPU_DEBUG, },
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{ 0x00000680, 0x0000068F, CPU_LBRANCH, },
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{ 0x000006C0, 0x000006CF, CPU_LBRANCH, },
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{ 0x000107CC, 0x000107D3, CPU_PMC, },
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{ 0xC0000080, 0xC0000080, CPU_FEATURES, },
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{ 0xC0000081, 0xC0000084, CPU_CALL, },
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{ 0xC0000100, 0xC0000102, CPU_BASE, },
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{ 0xC0000103, 0xC0000103, CPU_TIME, },
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{ 0xC0010000, 0xC0010007, CPU_PMC, },
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{ 0xC0010010, 0xC0010010, CPU_CONF, },
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{ 0xC0010015, 0xC0010015, CPU_CONF, },
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{ 0xC0010016, 0xC001001A, CPU_MTRR, },
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{ 0xC001001D, 0xC001001D, CPU_MTRR, },
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{ 0xC001001F, 0xC001001F, CPU_CONF, },
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{ 0xC0010030, 0xC0010035, CPU_BIOS, },
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{ 0xC0010044, 0xC0010048, CPU_MC, },
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{ 0xC0010050, 0xC0010056, CPU_SMM, },
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{ 0xC0010058, 0xC0010058, CPU_CONF, },
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{ 0xC0010060, 0xC0010060, CPU_CACHE, },
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{ 0xC0010061, 0xC0010068, CPU_SMM, },
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{ 0xC0010069, 0xC001006B, CPU_SMM, },
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{ 0xC0010070, 0xC0010071, CPU_SMM, },
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{ 0xC0010111, 0xC0010113, CPU_SMM, },
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{ 0xC0010114, 0xC0010118, CPU_SVM, },
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{ 0xC0010140, 0xC0010141, CPU_OSVM, },
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{ 0xC0011022, 0xC0011023, CPU_CONF, },
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};
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static int is_typeflag_valid(unsigned cpu, unsigned flag)
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{
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int i;
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/* Standard Registers should be always valid */
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if (flag >= CPU_TSS)
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return 1;
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for (i = 0; i < ARRAY_SIZE(cpu_reg_range); i++) {
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if (cpu_reg_range[i].flag == flag)
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return 1;
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}
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/* Invalid */
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return 0;
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}
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static unsigned get_cpu_range(unsigned cpu, unsigned *min, unsigned *max,
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int index, unsigned flag)
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{
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if (cpu_reg_range[index].flag == flag) {
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*min = cpu_reg_range[index].min;
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*max = cpu_reg_range[index].max;
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} else
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*max = 0;
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return *max;
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}
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/* This function can also be called with seq = NULL for printk */
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static void print_cpu_data(struct seq_file *seq, unsigned type,
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u32 low, u32 high)
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{
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struct cpu_private *priv;
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u64 val = high;
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if (seq) {
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priv = seq->private;
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if (priv->file) {
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val = (val << 32) | low;
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seq_printf(seq, "0x%llx\n", val);
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} else
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seq_printf(seq, " %08x: %08x_%08x\n",
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type, high, low);
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} else
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printk(KERN_INFO " %08x: %08x_%08x\n", type, high, low);
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}
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/* This function can also be called with seq = NULL for printk */
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static void print_msr(struct seq_file *seq, unsigned cpu, unsigned flag)
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{
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unsigned msr, msr_min, msr_max;
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struct cpu_private *priv;
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u32 low, high;
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int i;
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if (seq) {
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priv = seq->private;
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if (priv->file) {
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if (!rdmsr_safe_on_cpu(priv->cpu, priv->reg,
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&low, &high))
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print_cpu_data(seq, priv->reg, low, high);
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return;
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}
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}
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for (i = 0; i < ARRAY_SIZE(cpu_reg_range); i++) {
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if (!get_cpu_range(cpu, &msr_min, &msr_max, i, flag))
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continue;
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for (msr = msr_min; msr <= msr_max; msr++) {
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if (rdmsr_safe_on_cpu(cpu, msr, &low, &high))
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continue;
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print_cpu_data(seq, msr, low, high);
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}
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}
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}
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static void print_tss(void *arg)
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{
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struct pt_regs *regs = task_pt_regs(current);
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struct seq_file *seq = arg;
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unsigned int seg;
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seq_printf(seq, " RAX\t: %016lx\n", regs->ax);
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seq_printf(seq, " RBX\t: %016lx\n", regs->bx);
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seq_printf(seq, " RCX\t: %016lx\n", regs->cx);
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seq_printf(seq, " RDX\t: %016lx\n", regs->dx);
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seq_printf(seq, " RSI\t: %016lx\n", regs->si);
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seq_printf(seq, " RDI\t: %016lx\n", regs->di);
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seq_printf(seq, " RBP\t: %016lx\n", regs->bp);
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seq_printf(seq, " ESP\t: %016lx\n", regs->sp);
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#ifdef CONFIG_X86_64
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seq_printf(seq, " R08\t: %016lx\n", regs->r8);
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seq_printf(seq, " R09\t: %016lx\n", regs->r9);
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seq_printf(seq, " R10\t: %016lx\n", regs->r10);
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seq_printf(seq, " R11\t: %016lx\n", regs->r11);
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seq_printf(seq, " R12\t: %016lx\n", regs->r12);
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seq_printf(seq, " R13\t: %016lx\n", regs->r13);
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seq_printf(seq, " R14\t: %016lx\n", regs->r14);
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seq_printf(seq, " R15\t: %016lx\n", regs->r15);
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#endif
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asm("movl %%cs,%0" : "=r" (seg));
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seq_printf(seq, " CS\t: %04x\n", seg);
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asm("movl %%ds,%0" : "=r" (seg));
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seq_printf(seq, " DS\t: %04x\n", seg);
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seq_printf(seq, " SS\t: %04lx\n", regs->ss & 0xffff);
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asm("movl %%es,%0" : "=r" (seg));
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seq_printf(seq, " ES\t: %04x\n", seg);
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asm("movl %%fs,%0" : "=r" (seg));
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seq_printf(seq, " FS\t: %04x\n", seg);
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asm("movl %%gs,%0" : "=r" (seg));
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seq_printf(seq, " GS\t: %04x\n", seg);
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seq_printf(seq, " EFLAGS\t: %016lx\n", regs->flags);
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seq_printf(seq, " EIP\t: %016lx\n", regs->ip);
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}
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static void print_cr(void *arg)
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{
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struct seq_file *seq = arg;
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seq_printf(seq, " cr0\t: %016lx\n", read_cr0());
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seq_printf(seq, " cr2\t: %016lx\n", read_cr2());
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seq_printf(seq, " cr3\t: %016lx\n", read_cr3());
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seq_printf(seq, " cr4\t: %016lx\n", read_cr4_safe());
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#ifdef CONFIG_X86_64
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seq_printf(seq, " cr8\t: %016lx\n", read_cr8());
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#endif
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}
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static void print_desc_ptr(char *str, struct seq_file *seq, struct desc_ptr dt)
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{
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seq_printf(seq, " %s\t: %016llx\n", str, (u64)(dt.address | dt.size));
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}
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static void print_dt(void *seq)
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{
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struct desc_ptr dt;
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unsigned long ldt;
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/* IDT */
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store_idt((struct desc_ptr *)&dt);
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print_desc_ptr("IDT", seq, dt);
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/* GDT */
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store_gdt((struct desc_ptr *)&dt);
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print_desc_ptr("GDT", seq, dt);
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/* LDT */
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store_ldt(ldt);
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seq_printf(seq, " LDT\t: %016lx\n", ldt);
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/* TR */
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store_tr(ldt);
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seq_printf(seq, " TR\t: %016lx\n", ldt);
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}
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static void print_dr(void *arg)
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{
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struct seq_file *seq = arg;
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unsigned long dr;
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int i;
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for (i = 0; i < 8; i++) {
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/* Ignore db4, db5 */
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if ((i == 4) || (i == 5))
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continue;
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get_debugreg(dr, i);
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seq_printf(seq, " dr%d\t: %016lx\n", i, dr);
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}
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seq_printf(seq, "\n MSR\t:\n");
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}
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static void print_apic(void *arg)
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{
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struct seq_file *seq = arg;
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#ifdef CONFIG_X86_LOCAL_APIC
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seq_printf(seq, " LAPIC\t:\n");
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seq_printf(seq, " ID\t\t: %08x\n", apic_read(APIC_ID) >> 24);
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seq_printf(seq, " LVR\t\t: %08x\n", apic_read(APIC_LVR));
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seq_printf(seq, " TASKPRI\t: %08x\n", apic_read(APIC_TASKPRI));
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seq_printf(seq, " ARBPRI\t\t: %08x\n", apic_read(APIC_ARBPRI));
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seq_printf(seq, " PROCPRI\t: %08x\n", apic_read(APIC_PROCPRI));
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seq_printf(seq, " LDR\t\t: %08x\n", apic_read(APIC_LDR));
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seq_printf(seq, " DFR\t\t: %08x\n", apic_read(APIC_DFR));
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seq_printf(seq, " SPIV\t\t: %08x\n", apic_read(APIC_SPIV));
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seq_printf(seq, " ISR\t\t: %08x\n", apic_read(APIC_ISR));
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seq_printf(seq, " ESR\t\t: %08x\n", apic_read(APIC_ESR));
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seq_printf(seq, " ICR\t\t: %08x\n", apic_read(APIC_ICR));
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seq_printf(seq, " ICR2\t\t: %08x\n", apic_read(APIC_ICR2));
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seq_printf(seq, " LVTT\t\t: %08x\n", apic_read(APIC_LVTT));
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seq_printf(seq, " LVTTHMR\t: %08x\n", apic_read(APIC_LVTTHMR));
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seq_printf(seq, " LVTPC\t\t: %08x\n", apic_read(APIC_LVTPC));
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seq_printf(seq, " LVT0\t\t: %08x\n", apic_read(APIC_LVT0));
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seq_printf(seq, " LVT1\t\t: %08x\n", apic_read(APIC_LVT1));
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seq_printf(seq, " LVTERR\t\t: %08x\n", apic_read(APIC_LVTERR));
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seq_printf(seq, " TMICT\t\t: %08x\n", apic_read(APIC_TMICT));
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seq_printf(seq, " TMCCT\t\t: %08x\n", apic_read(APIC_TMCCT));
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seq_printf(seq, " TDCR\t\t: %08x\n", apic_read(APIC_TDCR));
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if (boot_cpu_has(X86_FEATURE_EXTAPIC)) {
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unsigned int i, v, maxeilvt;
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v = apic_read(APIC_EFEAT);
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maxeilvt = (v >> 16) & 0xff;
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seq_printf(seq, " EFEAT\t\t: %08x\n", v);
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seq_printf(seq, " ECTRL\t\t: %08x\n", apic_read(APIC_ECTRL));
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for (i = 0; i < maxeilvt; i++) {
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v = apic_read(APIC_EILVTn(i));
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seq_printf(seq, " EILVT%d\t\t: %08x\n", i, v);
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}
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}
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#endif /* CONFIG_X86_LOCAL_APIC */
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seq_printf(seq, "\n MSR\t:\n");
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}
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static int cpu_seq_show(struct seq_file *seq, void *v)
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{
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struct cpu_private *priv = seq->private;
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if (priv == NULL)
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return -EINVAL;
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switch (cpu_base[priv->type].flag) {
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case CPU_TSS:
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smp_call_function_single(priv->cpu, print_tss, seq, 1);
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break;
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case CPU_CR:
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smp_call_function_single(priv->cpu, print_cr, seq, 1);
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break;
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case CPU_DT:
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smp_call_function_single(priv->cpu, print_dt, seq, 1);
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break;
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case CPU_DEBUG:
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if (priv->file == CPU_INDEX_BIT)
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smp_call_function_single(priv->cpu, print_dr, seq, 1);
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print_msr(seq, priv->cpu, cpu_base[priv->type].flag);
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break;
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case CPU_APIC:
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if (priv->file == CPU_INDEX_BIT)
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smp_call_function_single(priv->cpu, print_apic, seq, 1);
|
|
print_msr(seq, priv->cpu, cpu_base[priv->type].flag);
|
|
break;
|
|
|
|
default:
|
|
print_msr(seq, priv->cpu, cpu_base[priv->type].flag);
|
|
break;
|
|
}
|
|
seq_printf(seq, "\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *cpu_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
if (*pos == 0) /* One time is enough ;-) */
|
|
return seq;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void *cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
|
|
return cpu_seq_start(seq, pos);
|
|
}
|
|
|
|
static void cpu_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
}
|
|
|
|
static const struct seq_operations cpu_seq_ops = {
|
|
.start = cpu_seq_start,
|
|
.next = cpu_seq_next,
|
|
.stop = cpu_seq_stop,
|
|
.show = cpu_seq_show,
|
|
};
|
|
|
|
static int cpu_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct cpu_private *priv = inode->i_private;
|
|
struct seq_file *seq;
|
|
int err;
|
|
|
|
err = seq_open(file, &cpu_seq_ops);
|
|
if (!err) {
|
|
seq = file->private_data;
|
|
seq->private = priv;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int write_msr(struct cpu_private *priv, u64 val)
|
|
{
|
|
u32 low, high;
|
|
|
|
high = (val >> 32) & 0xffffffff;
|
|
low = val & 0xffffffff;
|
|
|
|
if (!wrmsr_safe_on_cpu(priv->cpu, priv->reg, low, high))
|
|
return 0;
|
|
|
|
return -EPERM;
|
|
}
|
|
|
|
static int write_cpu_register(struct cpu_private *priv, const char *buf)
|
|
{
|
|
int ret = -EPERM;
|
|
u64 val;
|
|
|
|
ret = strict_strtoull(buf, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Supporting only MSRs */
|
|
if (priv->type < CPU_TSS_BIT)
|
|
return write_msr(priv, val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t cpu_write(struct file *file, const char __user *ubuf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
struct cpu_private *priv = seq->private;
|
|
char buf[19];
|
|
|
|
if ((priv == NULL) || (count >= sizeof(buf)))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&buf, ubuf, count))
|
|
return -EFAULT;
|
|
|
|
buf[count] = 0;
|
|
|
|
if ((cpu_base[priv->type].write) && (cpu_file[priv->file].write))
|
|
if (!write_cpu_register(priv, buf))
|
|
return count;
|
|
|
|
return -EACCES;
|
|
}
|
|
|
|
static const struct file_operations cpu_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = cpu_seq_open,
|
|
.read = seq_read,
|
|
.write = cpu_write,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int cpu_create_file(unsigned cpu, unsigned type, unsigned reg,
|
|
unsigned file, struct dentry *dentry)
|
|
{
|
|
struct cpu_private *priv = NULL;
|
|
|
|
/* Already intialized */
|
|
if (file == CPU_INDEX_BIT)
|
|
if (per_cpu(cpu_arr[type].init, cpu))
|
|
return 0;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (priv == NULL)
|
|
return -ENOMEM;
|
|
|
|
priv->cpu = cpu;
|
|
priv->type = type;
|
|
priv->reg = reg;
|
|
priv->file = file;
|
|
mutex_lock(&cpu_debug_lock);
|
|
per_cpu(priv_arr[type], cpu) = priv;
|
|
per_cpu(cpu_priv_count, cpu)++;
|
|
mutex_unlock(&cpu_debug_lock);
|
|
|
|
if (file)
|
|
debugfs_create_file(cpu_file[file].name, S_IRUGO,
|
|
dentry, (void *)priv, &cpu_fops);
|
|
else {
|
|
debugfs_create_file(cpu_base[type].name, S_IRUGO,
|
|
per_cpu(cpu_arr[type].dentry, cpu),
|
|
(void *)priv, &cpu_fops);
|
|
mutex_lock(&cpu_debug_lock);
|
|
per_cpu(cpu_arr[type].init, cpu) = 1;
|
|
mutex_unlock(&cpu_debug_lock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cpu_init_regfiles(unsigned cpu, unsigned int type, unsigned reg,
|
|
struct dentry *dentry)
|
|
{
|
|
unsigned file;
|
|
int err = 0;
|
|
|
|
for (file = 0; file < ARRAY_SIZE(cpu_file); file++) {
|
|
err = cpu_create_file(cpu, type, reg, file, dentry);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int cpu_init_msr(unsigned cpu, unsigned type, struct dentry *dentry)
|
|
{
|
|
struct dentry *cpu_dentry = NULL;
|
|
unsigned reg, reg_min, reg_max;
|
|
int i, err = 0;
|
|
char reg_dir[12];
|
|
u32 low, high;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cpu_reg_range); i++) {
|
|
if (!get_cpu_range(cpu, ®_min, ®_max, i,
|
|
cpu_base[type].flag))
|
|
continue;
|
|
|
|
for (reg = reg_min; reg <= reg_max; reg++) {
|
|
if (rdmsr_safe_on_cpu(cpu, reg, &low, &high))
|
|
continue;
|
|
|
|
sprintf(reg_dir, "0x%x", reg);
|
|
cpu_dentry = debugfs_create_dir(reg_dir, dentry);
|
|
err = cpu_init_regfiles(cpu, type, reg, cpu_dentry);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int cpu_init_allreg(unsigned cpu, struct dentry *dentry)
|
|
{
|
|
struct dentry *cpu_dentry = NULL;
|
|
unsigned type;
|
|
int err = 0;
|
|
|
|
for (type = 0; type < ARRAY_SIZE(cpu_base) - 1; type++) {
|
|
if (!is_typeflag_valid(cpu, cpu_base[type].flag))
|
|
continue;
|
|
cpu_dentry = debugfs_create_dir(cpu_base[type].name, dentry);
|
|
per_cpu(cpu_arr[type].dentry, cpu) = cpu_dentry;
|
|
|
|
if (type < CPU_TSS_BIT)
|
|
err = cpu_init_msr(cpu, type, cpu_dentry);
|
|
else
|
|
err = cpu_create_file(cpu, type, 0, CPU_INDEX_BIT,
|
|
cpu_dentry);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int cpu_init_cpu(void)
|
|
{
|
|
struct dentry *cpu_dentry = NULL;
|
|
struct cpuinfo_x86 *cpui;
|
|
char cpu_dir[12];
|
|
unsigned cpu;
|
|
int err = 0;
|
|
|
|
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
|
|
cpui = &cpu_data(cpu);
|
|
if (!cpu_has(cpui, X86_FEATURE_MSR))
|
|
continue;
|
|
|
|
sprintf(cpu_dir, "cpu%d", cpu);
|
|
cpu_dentry = debugfs_create_dir(cpu_dir, cpu_debugfs_dir);
|
|
err = cpu_init_allreg(cpu, cpu_dentry);
|
|
|
|
pr_info("cpu%d(%d) debug files %d\n",
|
|
cpu, nr_cpu_ids, per_cpu(cpu_priv_count, cpu));
|
|
if (per_cpu(cpu_priv_count, cpu) > MAX_CPU_FILES) {
|
|
pr_err("Register files count %d exceeds limit %d\n",
|
|
per_cpu(cpu_priv_count, cpu), MAX_CPU_FILES);
|
|
per_cpu(cpu_priv_count, cpu) = MAX_CPU_FILES;
|
|
err = -ENFILE;
|
|
}
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __init cpu_debug_init(void)
|
|
{
|
|
cpu_debugfs_dir = debugfs_create_dir("cpu", arch_debugfs_dir);
|
|
|
|
return cpu_init_cpu();
|
|
}
|
|
|
|
static void __exit cpu_debug_exit(void)
|
|
{
|
|
int i, cpu;
|
|
|
|
if (cpu_debugfs_dir)
|
|
debugfs_remove_recursive(cpu_debugfs_dir);
|
|
|
|
for (cpu = 0; cpu < nr_cpu_ids; cpu++)
|
|
for (i = 0; i < per_cpu(cpu_priv_count, cpu); i++)
|
|
kfree(per_cpu(priv_arr[i], cpu));
|
|
}
|
|
|
|
module_init(cpu_debug_init);
|
|
module_exit(cpu_debug_exit);
|
|
|
|
MODULE_AUTHOR("Jaswinder Singh Rajput");
|
|
MODULE_DESCRIPTION("CPU Debug module");
|
|
MODULE_LICENSE("GPL");
|