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Subject[RFC][PATCH 9/10 -tip] x86: cpu_debug display cpuid functions
From
Date

Add support for cpuid standard and extended functions

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
---
arch/x86/include/asm/cpu_debug.h | 4 ++-
arch/x86/kernel/cpu/cpu_debug.c | 64 ++++++++++++++++++++++++++++++++++++--
2 files changed, 64 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/cpu_debug.h b/arch/x86/include/asm/cpu_debug.h
index dc24338..377f658 100644
--- a/arch/x86/include/asm/cpu_debug.h
+++ b/arch/x86/include/asm/cpu_debug.h
@@ -46,11 +46,11 @@ enum cpu_debug_bit {
CPU_MMIO, /* Memory based IO */
CPU_DISPLAY, /* Display/VGA */
CPU_LINK, /* HyperTransport */
- CPU_CPUID, /* CPUID */
/* Standard Registers */
CPU_TSS, /* Task Stack Segment */
CPU_CR, /* Control Registers */
CPU_DT, /* Descriptor Table */
+ CPU_CPUID, /* CPUID */
CPU_PCI, /* PCI configuration */
/* End of Registers flags */
CPU_REG_MAX, /* Max Registers flags */
@@ -75,6 +75,8 @@ enum cpu_cat_bit {
#define MAX_CPU_FILES 768 /* Max CPU debug files */
#define MAX_CPU_PCI 5 /* AMD supports func 0-4*/

+#define CPUID_MASK 0xffff0000
+
struct cpu_private {
unsigned cpu;
unsigned type;
diff --git a/arch/x86/kernel/cpu/cpu_debug.c b/arch/x86/kernel/cpu/cpu_debug.c
index b4dfddd..f7f702e 100644
--- a/arch/x86/kernel/cpu/cpu_debug.c
+++ b/arch/x86/kernel/cpu/cpu_debug.c
@@ -72,10 +72,10 @@ static struct cpu_debug_base cpu_base[] = {
{ "mmio", CPU_MMIO, 0 },
{ "display", CPU_DISPLAY, 0 },
{ "link", CPU_LINK, 0 },
- { "cpuid", CPU_CPUID, 0 },
{ "tss", CPU_TSS, 0 },
{ "cr", CPU_CR, 0 },
{ "dt", CPU_DT, 0 },
+ { "cpuid", CPU_CPUID, 0 },
{ "pci", CPU_PCI, 0 },
{ "registers", CPU_REG_ALL, 0 },
};
@@ -303,6 +303,13 @@ static struct cpu_debug_range cpu_amd_pci4[] = {
{ 0x1E0, 0x1F0, CPU_POWER },
};

+/* Extended CPUID base address */
+static u32 cpu_ext_cpuid[] = {
+ 0x80000000, /* Intel, AMD */
+ 0x80860000, /* Transmeta */
+ 0xC0000000, /* Centaur */
+};
+
/* Check validity of cpu debug flag */
static int is_typeflag_valid(unsigned cpu, unsigned flag)
{
@@ -518,6 +525,49 @@ static void print_apic(void *arg)
#endif
}

+/* Get extended CPUID level */
+static u32 get_extended_cpuid(void)
+{
+ u32 i, level;
+
+ for (i = 0; i < ARRAY_SIZE(cpu_ext_cpuid); i++) {
+ level = cpuid_eax(cpu_ext_cpuid[i]);
+ if ((level & CPUID_MASK) == cpu_ext_cpuid[i])
+ return level;
+ }
+
+ return 0; /* Not found */
+}
+
+static void print_cpuidabcd(struct seq_file *seq, u32 min, u32 max)
+{
+ u32 i, eax, ebx, ecx, edx;
+
+ for (i = min; i <= max; i++) {
+ cpuid(i, &eax, &ebx, &ecx, &edx);
+ seq_printf(seq, " %08x %08x %08x %08x %08x\n",
+ i, eax, ebx, ecx, edx);
+ }
+}
+
+static void print_cpuid(void *arg)
+{
+ struct seq_file *seq = arg;
+ u32 level;
+
+ seq_printf(seq, " CPUID\t:\n");
+ seq_printf(seq, " eax ebx ecx edx\n");
+
+ /* Standard CPUID functions */
+ level = cpuid_eax(0);
+ print_cpuidabcd(seq, 0, level);
+
+ /* Extended CPUID functions */
+ level = get_extended_cpuid();
+ if (level)
+ print_cpuidabcd(seq, (level & CPUID_MASK), level);
+}
+
static void print_apicval(void *arg)
{
struct seq_file *seq = arg;
@@ -632,6 +682,14 @@ static int cpu_seq_show(struct seq_file *seq, void *v)
case CPU_DT:
smp_call_function_single(priv->cpu, print_dt, seq, 1);
break;
+ case CPU_CPUID:
+ if (priv->file == CPU_INDEX)
+ smp_call_function_single(priv->cpu, print_cpuid,
+ seq, 1);
+ else
+ smp_call_function_single(priv->cpu, print_pcival,
+ seq, 1);
+ break;
case CPU_PCI:
if (priv->file == CPU_INDEX)
smp_call_function_single(priv->cpu, print_pci, seq, 1);
@@ -814,7 +872,7 @@ static int cpu_init_regfiles(unsigned cpu, unsigned int type, unsigned reg,
unsigned file;
int err = 0;

- for (file = 0; file < ARRAY_SIZE(cpu_file); file++) {
+ for (file = 0; file < ARRAY_SIZE(cpu_file); file++) {
err = cpu_create_file(cpu, type, reg, file, cat, dentry);
if (err)
return err;
@@ -973,7 +1031,7 @@ static int cpu_init_allreg(unsigned cpu, struct dentry *dentry)
unsigned type;
int err = 0;

- for (type = 0; type < ARRAY_SIZE(cpu_base) - 1; type++) {
+ for (type = 0; type < ARRAY_SIZE(cpu_base) - 1; type++) {
cpu_dentry = debugfs_create_dir(cpu_base[type].name, dentry);
per_cpu(cpu_arr[type].dentry, cpu) = cpu_dentry;

--
1.6.0.6




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