Re: [PATCH] x86: x86_{phys,virt}_bits field also for i386 (v2)

["Jan Beulich" <jbeulich@novell.com>]

>>> Ingo Molnar <mingo@elte.hu> 05.09.08 17:00 >>>
>
>* Jan Beulich <jbeulich@novell.com> wrote:
>
>> Make the x86_{phys,virt}_bits common for 32- and 64-bits, and use the
>> former in ioremap's phys_addr_valid() check also on 32bit/PAE.
>> 
>> Signed-off-by: Jan Beulich <jbeulich@novell.com>
>> 
>> ---
>>  arch/x86/kernel/cpu/common.c |   17 +++++++++++++++++
>>  arch/x86/mm/ioremap.c        |   15 ++++++---------
>>  include/asm-x86/processor.h  |    4 ++--
>>  3 files changed, 25 insertions(+), 11 deletions(-)
>
>hm, the cpu/common.c bits just got reworked massively in tip/master. 
>I've tried a blind merge (see the patch below) but at least the first 
>hunk looks wrong. Mind looking at how to merge this?

This is my take at it:

Make the x86_{phys,virt}_bits common for 32- and 64-bits, and use the
former in ioremap's phys_addr_valid() check also on 32bit/PAE.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

---
 arch/x86/kernel/cpu/common.c |   22 +++++++++++++++++++++-
 arch/x86/mm/ioremap.c        |   13 ++++++-------
 include/asm-x86/processor.h  |    4 ++--
 3 files changed, 29 insertions(+), 10 deletions(-)

--- linux-x86.orig/arch/x86/kernel/cpu/common.c
+++ linux-x86/arch/x86/kernel/cpu/common.c
@@ -472,14 +472,20 @@ static void __cpuinit get_cpu_cap(struct
 		if (xlvl >= 0x80860001)
 			c->x86_capability[2] = cpuid_edx(0x80860001);
 	}
+#endif
 
 	if (c->extended_cpuid_level >= 0x80000008) {
 		u32 eax = cpuid_eax(0x80000008);
 
 		c->x86_virt_bits = (eax >> 8) & 0xff;
 		c->x86_phys_bits = eax & 0xff;
+		/* CPUID workaround for Intel 0F33/0F34 CPU */
+		if (c->x86_vendor == X86_VENDOR_INTEL
+		    && c->x86 == 0xF && c->x86_model == 0x3
+		    && (c->x86_mask == 0x3
+			|| c->x86_mask == 0x4))
+			c->x86_phys_bits = 36;
 	}
-#endif
 
 	if (c->extended_cpuid_level >= 0x80000007)
 		c->x86_power = cpuid_edx(0x80000007);
@@ -500,6 +506,8 @@ static void __init early_identify_cpu(st
 	c->x86_clflush_size = 64;
 #else
 	c->x86_clflush_size = 32;
+	c->x86_phys_bits = 32;
+	c->x86_virt_bits = 32;
 #endif
 	c->x86_cache_alignment = c->x86_clflush_size;
 
@@ -512,6 +520,11 @@ static void __init early_identify_cpu(st
 
 	cpu_detect(c);
 
+#ifdef CONFIG_X86_32
+	if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36))
+		c->x86_phys_bits = 36;
+#endif
+
 	get_cpu_vendor(c);
 
 	get_cpu_cap(c);
@@ -635,6 +648,8 @@ static void __cpuinit identify_cpu(struc
 #else
 	c->cpuid_level = -1;	/* CPUID not detected */
 	c->x86_clflush_size = 32;
+	c->x86_phys_bits = 32;
+	c->x86_virt_bits = 32;
 #endif
 	c->x86_cache_alignment = c->x86_clflush_size;
 	memset(&c->x86_capability, 0, sizeof c->x86_capability);
@@ -652,6 +667,11 @@ static void __cpuinit identify_cpu(struc
 
 	generic_identify(c);
 
+#ifdef CONFIG_X86_32
+	if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36))
+		c->x86_phys_bits = 36;
+#endif
+
 	if (this_cpu->c_identify)
 		this_cpu->c_identify(c);
 
--- linux-x86.orig/arch/x86/mm/ioremap.c
+++ linux-x86/arch/x86/mm/ioremap.c
@@ -22,13 +22,17 @@
 #include <asm/pgalloc.h>
 #include <asm/pat.h>
 
-#ifdef CONFIG_X86_64
-
 static inline int phys_addr_valid(unsigned long addr)
 {
+#ifdef CONFIG_RESOURCES_64BIT
 	return addr < (1UL << boot_cpu_data.x86_phys_bits);
+#else
+	return 1;
+#endif
 }
 
+#ifdef CONFIG_X86_64
+
 unsigned long __phys_addr(unsigned long x)
 {
 	if (x >= __START_KERNEL_map) {
@@ -47,11 +51,6 @@ EXPORT_SYMBOL(__phys_addr);
 
 #else
 
-static inline int phys_addr_valid(unsigned long addr)
-{
-	return 1;
-}
-
 #ifdef CONFIG_DEBUG_VIRTUAL
 unsigned long __phys_addr(unsigned long x)
 {
--- linux-x86.orig/include/asm-x86/processor.h
+++ linux-x86/include/asm-x86/processor.h
@@ -74,8 +74,6 @@ struct cpuinfo_x86 {
 #else
 	/* Number of 4K pages in DTLB/ITLB combined(in pages): */
 	int			 x86_tlbsize;
-	__u8			x86_virt_bits;
-	__u8			x86_phys_bits;
 	/* CPUID returned core id bits: */
 	__u8			x86_coreid_bits;
 #endif
@@ -100,6 +98,8 @@ struct cpuinfo_x86 {
 	u16			apicid;
 	u16			initial_apicid;
 	u16			x86_clflush_size;
+	u8			x86_virt_bits;
+	u8			x86_phys_bits;
 #ifdef CONFIG_SMP
 	/* number of cores as seen by the OS: */
 	u16			booted_cores;