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Message-Id: <1237036887.4546.6.camel@ht.satnam>
Date: Sat, 14 Mar 2009 18:51:27 +0530
From: Jaswinder Singh Rajput <jaswinder@...nel.org>
To: Sam Ravnborg <sam@...nborg.org>
Cc: Ingo Molnar <mingo@...e.hu>, x86 maintainers <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: cpu/intel.c cleanup
On Sat, 2009-03-14 at 14:11 +0100, Sam Ravnborg wrote:
> >
> > #include <asm/processor.h>
> > +#include <asm/topology.h>
> > #include <asm/pgtable.h>
> > -#include <asm/msr.h>
> > -#include <asm/uaccess.h>
> > -#include <asm/ds.h>
> > +#ifdef CONFIG_X86_LOCAL_APIC
> > +#include <asm/mpspec.h>
> > +#include <asm/apic.h>
> > +#endif
>
> If these header files are only relevant for CONFIG_X86_LOCAL_APIC
> then we should move the ifdef down into the header file,
> so users do not forget it.
>
I was also thinking about this.
Here is new patch:
Subject: [PATCH] x86: cpu/intel.c cleanup
- fix various style problems
- fix header files issues
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
arch/x86/kernel/cpu/intel.c | 179 ++++++++++++++++++++++---------------------
1 files changed, 90 insertions(+), 89 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5dac7bd..f490614 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1,38 +1,40 @@
-#include <linux/init.h>
+#include <linux/thread_info.h>
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
#include <linux/kernel.h>
-
+#include <linux/module.h>
#include <linux/string.h>
-#include <linux/bitops.h>
-#include <linux/smp.h>
#include <linux/sched.h>
-#include <linux/thread_info.h>
-#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/smp.h>
#include <asm/processor.h>
+#include <asm/topology.h>
#include <asm/pgtable.h>
-#include <asm/msr.h>
-#include <asm/uaccess.h>
-#include <asm/ds.h>
+#include <asm/mpspec.h>
+#include <asm/apic.h>
#include <asm/bugs.h>
+#include <asm/numa.h>
#include <asm/cpu.h>
-
-#ifdef CONFIG_X86_64
-#include <asm/topology.h>
-#include <asm/numa_64.h>
-#endif
+#include <asm/msr.h>
+#include <asm/ds.h>
#include "cpu.h"
-#ifdef CONFIG_X86_LOCAL_APIC
-#include <asm/mpspec.h>
-#include <asm/apic.h>
-#endif
+/* Intel VMX MSR indicated features */
+#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
+#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
+#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
+#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
+#define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
+#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
{
+ u64 misc_enable;
+
/* Unmask CPUID levels if masked: */
if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
- u64 misc_enable;
rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
@@ -44,7 +46,7 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
}
if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
- (c->x86 == 0x6 && c->x86_model >= 0x0e))
+ (c->x86 == 0x6 && c->x86_model >= 0x0e))
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
#ifdef CONFIG_X86_64
@@ -96,17 +98,16 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
* Ingo Molnar reported a Pentium D (model 6) and a Xeon
* (model 2) with the same problem.
*/
- if (c->x86 == 15) {
- u64 misc_enable;
+ if (c->x86 != 15)
+ return;
- rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+ rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
- if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
- printk(KERN_INFO "kmemcheck: Disabling fast string operations\n");
+ if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
+ pr_info("kmemcheck: Disabling fast string operations\n");
- misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
- wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
- }
+ misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
+ wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
}
#endif
}
@@ -125,9 +126,11 @@ int __cpuinit ppro_with_ram_bug(void)
boot_cpu_data.x86 == 6 &&
boot_cpu_data.x86_model == 1 &&
boot_cpu_data.x86_mask < 8) {
- printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
+ pr_info("Pentium Pro with Errata#50 detected. "
+ "Taking evasive action.\n");
return 1;
}
+
return 0;
}
@@ -167,14 +170,32 @@ static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
#endif
}
+static unsigned int __cpuinit
+intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
+{
+ /*
+ * Intel PIII Tualatin. This comes in two flavours.
+ * One has 256kb of cache, the other 512. We have no way
+ * to determine which, so we use a boottime override
+ * for the 512kb model, and assume 256 otherwise.
+ */
+ if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
+ size = 256;
+
+ return size;
+}
+#endif
+
static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
{
+#ifdef CONFIG_X86_32
unsigned long lo, hi;
#ifdef CONFIG_X86_F00F_BUG
/*
- * All current models of Pentium and Pentium with MMX technology CPUs
- * have the F0 0F bug, which lets nonprivileged users lock up the system.
+ * All current models of Pentium and Pentium with MMX technology
+ * CPUs have the F0 0F bug, which lets nonprivileged users lock
+ * up the system.
* Note that the workaround only should be initialized once...
*/
c->f00f_bug = 0;
@@ -184,7 +205,8 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
c->f00f_bug = 1;
if (!f00f_workaround_enabled) {
trap_init_f00f_bug();
- printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
+ printk(KERN_NOTICE "Intel Pentium with F0 0F bug - "
+ "workaround enabled.\n");
f00f_workaround_enabled = 1;
}
}
@@ -194,7 +216,7 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
* model 3 mask 3
*/
- if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
+ if ((c->x86 << 8 | c->x86_model << 4 | c->x86_mask) < 0x633)
clear_cpu_cap(c, X86_FEATURE_SEP);
/*
@@ -204,10 +226,10 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
- printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
- printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
+ pr_info("CPU: C0 stepping P4 Xeon detected.\n");
+ pr_info("CPU: Disabling hardware prefetching (Errata 037)\n");
lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
- wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
+ wrmsr(MSR_IA32_MISC_ENABLE, lo, hi);
}
}
@@ -217,7 +239,7 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
* integrated APIC (see 11AP erratum in "Pentium Processor
* Specification Update").
*/
- if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
+ if (cpu_has_apic && (c->x86 << 8 | c->x86_model << 4) == 0x520 &&
(c->x86_mask < 0x6 || c->x86_mask == 0xb))
set_cpu_cap(c, X86_FEATURE_11AP);
@@ -245,28 +267,26 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
#endif
intel_smp_check(c);
-}
-#else
-static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
-{
-}
#endif
+}
static void __cpuinit srat_detect_node(void)
{
#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
- unsigned node;
- int cpu = smp_processor_id();
int apicid = hard_smp_processor_id();
+ int cpu = smp_processor_id();
+ unsigned node;
- /* Don't do the funky fallback heuristics the AMD version employs
- for now. */
+ /*
+ * Don't do the funky fallback heuristics the AMD version
+ * employs for now.
+ */
node = apicid_to_node[apicid];
if (node == NUMA_NO_NODE || !node_online(node))
node = first_node(node_online_map);
numa_set_node(cpu, node);
- printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
+ pr_info("CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
#endif
}
@@ -283,28 +303,20 @@ static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
/* Intel has a non-standard dependency on %ecx for this CPUID level. */
cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
if (eax & 0x1f)
- return ((eax >> 26) + 1);
+ return (eax >> 26) + 1;
else
return 1;
}
static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
{
- /* Intel VMX MSR indicated features */
-#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
-#define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
-#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
-#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
-#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
-#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
-
u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
+ clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
+ clear_cpu_cap(c, X86_FEATURE_VPID);
clear_cpu_cap(c, X86_FEATURE_VNMI);
- clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
clear_cpu_cap(c, X86_FEATURE_EPT);
- clear_cpu_cap(c, X86_FEATURE_VPID);
rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
msr_ctl = vmx_msr_high | vmx_msr_low;
@@ -329,15 +341,16 @@ static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
static void __cpuinit init_intel(struct cpuinfo_x86 *c)
{
unsigned int l2 = 0;
+ char *p = NULL;
early_init_intel(c);
intel_workarounds(c);
/*
- * Detect the extended topology information if available. This
- * will reinitialise the initial_apicid which will be used
- * in init_intel_cacheinfo()
+ * Detect the extended topology information if available.
+ * This will reinitialise the initial_apicid which will be
+ * used in init_intel_cacheinfo()
*/
detect_extended_topology(c);
@@ -361,22 +374,19 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
ds_init_intel(c);
}
- if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush)
- set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
+ switch (c->x86) {
+ case 6:
+ if (c->x86_model == 29 && cpu_has_clflush)
+ set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
#ifdef CONFIG_X86_64
- if (c->x86 == 15)
- c->x86_cache_alignment = c->x86_clflush_size * 2;
- if (c->x86 == 6)
set_cpu_cap(c, X86_FEATURE_REP_GOOD);
-#else
+#else /* CONFIG_X86_64 */
/*
* Names for the Pentium II/Celeron processors
* detectable only by also checking the cache size.
* Dixon is NOT a Celeron.
*/
- if (c->x86 == 6) {
- char *p = NULL;
switch (c->x86_model) {
case 5:
@@ -403,13 +413,19 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
if (p)
strcpy(c->x86_model_id, p);
- }
- if (c->x86 == 15)
- set_cpu_cap(c, X86_FEATURE_P4);
- if (c->x86 == 6)
set_cpu_cap(c, X86_FEATURE_P3);
-#endif
+#endif /* CONFIG_X86_64 */
+ break;
+
+ case 15:
+#ifdef CONFIG_X86_64
+ c->x86_cache_alignment = c->x86_clflush_size * 2;
+#else /* CONFIG_X86_64 */
+ set_cpu_cap(c, X86_FEATURE_P4);
+#endif /* CONFIG_X86_64 */
+ break;
+ }
if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
/*
@@ -429,20 +445,6 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
detect_vmx_virtcap(c);
}
-#ifdef CONFIG_X86_32
-static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
-{
- /*
- * Intel PIII Tualatin. This comes in two flavours.
- * One has 256kb of cache, the other 512. We have no way
- * to determine which, so we use a boottime override
- * for the 512kb model, and assume 256 otherwise.
- */
- if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
- size = 256;
- return size;
-}
-#endif
static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
.c_vendor = "Intel",
@@ -505,4 +507,3 @@ static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
};
cpu_dev_register(intel_cpu_dev);
-
--
1.6.0.6
--
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