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WSL2-Linux-Kernel
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x86: Clean up mtrr/main.c 

Fix following trivial style problems:

  ERROR: trailing whitespace X 25
  WARNING: Use #include <linux/uaccess.h> instead of <asm/uaccess.h>
  WARNING: Use #include <linux/kvm_para.h> instead of <asm/kvm_para.h>
  ERROR: do not initialise externals to 0 or NULL X 2
  ERROR: "foo * bar" should be "foo *bar" X 5
  ERROR: do not use assignment in if condition X 2
  WARNING: line over 80 characters X 8
  ERROR: return is not a function, parentheses are not required
  WARNING: braces {} are not necessary for any arm of this statement
  ERROR: space required before the open parenthesis '(' X 2
  ERROR: open brace '{' following function declarations go on the next line
  ERROR: space required after that ',' (ctx:VxV) X 8
  ERROR: space required before the open parenthesis '(' X 3
  ERROR: else should follow close brace '}'
  WARNING: space prohibited between function name and open parenthesis '('
  WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable X 2

Also use pr_debug and pr_warning where possible.

total: 50 errors, 14 warnings

arch/x86/kernel/cpu/mtrr/main.o:

   text	   data	    bss	    dec	    hex	filename
   3668	    116	   4156	   7940	   1f04	main.o.before
   3668	    116	   4156	   7940	   1f04	main.o.after

md5:
   e01af2fd28deef77c8d01e71acfbd365  main.o.before.asm
   e01af2fd28deef77c8d01e71acfbd365  main.o.after.asm

Suggested-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090703164225.GA21447@elte.hu>
Cc: Avi Kivity <avi@redhat.com> # Avi, please have a look at the kvm_para.h bit
[ More cleanups ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jaswinder Singh Rajput 2009-07-04 07:56:28 +05:30 коммит произвёл Ingo Molnar
Родитель 09b22c85d5
Коммит dbd51be026
1 изменённых файлов: 246 добавлений и 217 удалений
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223
arch/x86/kernel/cpu/mtrr/main.c
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@ -31,32 +31,37 @@
System Programming Guide; Section 9.11. (1997 edition - PPro). System Programming Guide; Section 9.11. (1997 edition - PPro).
*/ */
#define DEBUG
#include <linux/types.h> /* FIXME: kvm_para.h needs this */
#include <linux/kvm_para.h>
#include <linux/uaccess.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/sort.h>
#include <linux/cpu.h>
#include <linux/pci.h> #include <linux/pci.h>
#include <linux/smp.h> #include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/mutex.h>
#include <linux/sort.h>
#include <asm/processor.h>
#include <asm/e820.h> #include <asm/e820.h>
#include <asm/mtrr.h> #include <asm/mtrr.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <asm/msr.h> #include <asm/msr.h>
#include <asm/kvm_para.h>
#include "mtrr.h" #include "mtrr.h"
u32 num_var_ranges = 0; u32 num_var_ranges;
unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES]; unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
static DEFINE_MUTEX(mtrr_mutex); static DEFINE_MUTEX(mtrr_mutex);
u64 size_or_mask, size_and_mask; u64 size_or_mask, size_and_mask;
static struct mtrr_ops * mtrr_ops[X86_VENDOR_NUM] = {}; static struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
struct mtrr_ops * mtrr_if = NULL; struct mtrr_ops *mtrr_if;
static void set_mtrr(unsigned int reg, unsigned long base, static void set_mtrr(unsigned int reg, unsigned long base,
unsigned long size, mtrr_type type); unsigned long size, mtrr_type type);
@ -73,29 +78,35 @@ static int have_wrcomb(void)
struct pci_dev *dev; struct pci_dev *dev;
u8 rev; u8 rev;
if ((dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL)) != NULL) { dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL);
/* ServerWorks LE chipsets < rev 6 have problems with write-combining if (dev != NULL) {
Don't allow it and leave room for other chipsets to be tagged */ /*
* ServerWorks LE chipsets < rev 6 have problems with
* write-combining. Don't allow it and leave room for other
* chipsets to be tagged
*/
if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS && if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
dev->device == PCI_DEVICE_ID_SERVERWORKS_LE) { dev->device == PCI_DEVICE_ID_SERVERWORKS_LE) {
pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev); pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
if (rev <= 5) { if (rev <= 5) {
printk(KERN_INFO "mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n"); pr_info("mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n");
pci_dev_put(dev); pci_dev_put(dev);
return 0; return 0;
} }
} }
/* Intel 450NX errata # 23. Non ascending cacheline evictions to /*
write combining memory may resulting in data corruption */ * Intel 450NX errata # 23. Non ascending cacheline evictions to
* write combining memory may resulting in data corruption
*/
if (dev->vendor == PCI_VENDOR_ID_INTEL && if (dev->vendor == PCI_VENDOR_ID_INTEL &&
dev->device == PCI_DEVICE_ID_INTEL_82451NX) { dev->device == PCI_DEVICE_ID_INTEL_82451NX) {
printk(KERN_INFO "mtrr: Intel 450NX MMC detected. Write-combining disabled.\n"); pr_info("mtrr: Intel 450NX MMC detected. Write-combining disabled.\n");
pci_dev_put(dev); pci_dev_put(dev);
return 0; return 0;
} }
pci_dev_put(dev); pci_dev_put(dev);
} }
return (mtrr_if->have_wrcomb ? mtrr_if->have_wrcomb() : 0); return mtrr_if->have_wrcomb ? mtrr_if->have_wrcomb() : 0;
} }
/* This function returns the number of variable MTRRs */ /* This function returns the number of variable MTRRs */
@ -103,12 +114,13 @@ static void __init set_num_var_ranges(void)
{ {
unsigned long config = 0, dummy; unsigned long config = 0, dummy;
if (use_intel()) { if (use_intel())
rdmsr(MSR_MTRRcap, config, dummy); rdmsr(MSR_MTRRcap, config, dummy);
} else if (is_cpu(AMD)) else if (is_cpu(AMD))
config = 2; config = 2;
else if (is_cpu(CYRIX) || is_cpu(CENTAUR)) else if (is_cpu(CYRIX) || is_cpu(CENTAUR))
config = 8; config = 8;
num_var_ranges = config & 0xff; num_var_ranges = config & 0xff;
} }
@ -130,10 +142,12 @@ struct set_mtrr_data {
mtrr_type smp_type; mtrr_type smp_type;
}; };
static void ipi_handler(void *info) /**
/* [SUMMARY] Synchronisation handler. Executed by "other" CPUs. * ipi_handler - Synchronisation handler. Executed by "other" CPUs.
[RETURNS] Nothing. *
* Returns nothing.
*/ */
static void ipi_handler(void *info)
{ {
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
struct set_mtrr_data *data = info; struct set_mtrr_data *data = info;
@ -146,11 +160,12 @@ static void ipi_handler(void *info)
cpu_relax(); cpu_relax();
/* The master has cleared me to execute */ /* The master has cleared me to execute */
if (data->smp_reg != ~0U) if (data->smp_reg != ~0U) {
mtrr_if->set(data->smp_reg, data->smp_base, mtrr_if->set(data->smp_reg, data->smp_base,
data->smp_size, data->smp_type); data->smp_size, data->smp_type);
else } else {
mtrr_if->set_all(); mtrr_if->set_all();
}
atomic_dec(&data->count); atomic_dec(&data->count);
while (atomic_read(&data->gate)) while (atomic_read(&data->gate))
@ -161,7 +176,8 @@ static void ipi_handler(void *info)
#endif #endif
} }
static inline int types_compatible(mtrr_type type1, mtrr_type type2) { static inline int types_compatible(mtrr_type type1, mtrr_type type2)
{
return type1 == MTRR_TYPE_UNCACHABLE || return type1 == MTRR_TYPE_UNCACHABLE ||
type2 == MTRR_TYPE_UNCACHABLE || type2 == MTRR_TYPE_UNCACHABLE ||
(type1 == MTRR_TYPE_WRTHROUGH && type2 == MTRR_TYPE_WRBACK) || (type1 == MTRR_TYPE_WRTHROUGH && type2 == MTRR_TYPE_WRBACK) ||
@ -197,18 +213,19 @@ static inline int types_compatible(mtrr_type type1, mtrr_type type2) {
* of CPUs. As each CPU disables interrupts, it'll decrement it once. We wait * of CPUs. As each CPU disables interrupts, it'll decrement it once. We wait
* until it hits 0 and proceed. We set the data.gate flag and reset data.count. * until it hits 0 and proceed. We set the data.gate flag and reset data.count.
* Meanwhile, they are waiting for that flag to be set. Once it's set, each * Meanwhile, they are waiting for that flag to be set. Once it's set, each
* CPU goes through the transition of updating MTRRs. The CPU vendors may each do it * CPU goes through the transition of updating MTRRs.
* differently, so we call mtrr_if->set() callback and let them take care of it. * The CPU vendors may each do it differently,
* When they're done, they again decrement data->count and wait for data.gate to * so we call mtrr_if->set() callback and let them take care of it.
* be reset. * When they're done, they again decrement data->count and wait for data.gate
* When we finish, we wait for data.count to hit 0 and toggle the data.gate flag. * to be reset.
* When we finish, we wait for data.count to hit 0 and toggle the data.gate flag
* Everyone then enables interrupts and we all continue on. * Everyone then enables interrupts and we all continue on.
* *
* Note that the mechanism is the same for UP systems, too; all the SMP stuff * Note that the mechanism is the same for UP systems, too; all the SMP stuff
* becomes nops. * becomes nops.
*/ */
static void set_mtrr(unsigned int reg, unsigned long base, static void
unsigned long size, mtrr_type type) set_mtrr(unsigned int reg, unsigned long base, unsigned long size, mtrr_type type)
{ {
struct set_mtrr_data data; struct set_mtrr_data data;
unsigned long flags; unsigned long flags;
@ -218,7 +235,8 @@ static void set_mtrr(unsigned int reg, unsigned long base,
data.smp_size = size; data.smp_size = size;
data.smp_type = type; data.smp_type = type;
atomic_set(&data.count, num_booting_cpus() - 1); atomic_set(&data.count, num_booting_cpus() - 1);
/* make sure data.count is visible before unleashing other CPUs */
/* Make sure data.count is visible before unleashing other CPUs */
smp_wmb(); smp_wmb();
atomic_set(&data.gate, 0); atomic_set(&data.gate, 0);
@ -231,14 +249,15 @@ static void set_mtrr(unsigned int reg, unsigned long base,
while (atomic_read(&data.count)) while (atomic_read(&data.count))
cpu_relax(); cpu_relax();
/* ok, reset count and toggle gate */ /* Ok, reset count and toggle gate */
atomic_set(&data.count, num_booting_cpus() - 1); atomic_set(&data.count, num_booting_cpus() - 1);
smp_wmb(); smp_wmb();
atomic_set(&data.gate, 1); atomic_set(&data.gate, 1);
/* do our MTRR business */ /* Do our MTRR business */
/* HACK! /*
* HACK!
* We use this same function to initialize the mtrrs on boot. * We use this same function to initialize the mtrrs on boot.
* The state of the boot cpu's mtrrs has been saved, and we want * The state of the boot cpu's mtrrs has been saved, and we want
* to replicate across all the APs. * to replicate across all the APs.
@ -247,7 +266,7 @@ static void set_mtrr(unsigned int reg, unsigned long base,
if (reg != ~0U) if (reg != ~0U)
mtrr_if->set(reg, base, size, type); mtrr_if->set(reg, base, size, type);
/* wait for the others */ /* Wait for the others */
while (atomic_read(&data.count)) while (atomic_read(&data.count))
cpu_relax(); cpu_relax();
@ -300,39 +319,38 @@ static void set_mtrr(unsigned int reg, unsigned long base,
* BUGS: Needs a quiet flag for the cases where drivers do not mind * BUGS: Needs a quiet flag for the cases where drivers do not mind
* failures and do not wish system log messages to be sent. * failures and do not wish system log messages to be sent.
*/ */
int mtrr_add_page(unsigned long base, unsigned long size, int mtrr_add_page(unsigned long base, unsigned long size,
unsigned int type, bool increment) unsigned int type, bool increment)
{ {
unsigned long lbase, lsize;
int i, replace, error; int i, replace, error;
mtrr_type ltype; mtrr_type ltype;
unsigned long lbase, lsize;
if (!mtrr_if) if (!mtrr_if)
return -ENXIO; return -ENXIO;
if ((error = mtrr_if->validate_add_page(base,size,type))) error = mtrr_if->validate_add_page(base, size, type);
if (error)
return error; return error;
if (type >= MTRR_NUM_TYPES) { if (type >= MTRR_NUM_TYPES) {
printk(KERN_WARNING "mtrr: type: %u invalid\n", type); pr_warning("mtrr: type: %u invalid\n", type);
return -EINVAL; return -EINVAL;
} }
/* If the type is WC, check that this processor supports it */ /* If the type is WC, check that this processor supports it */
if ((type == MTRR_TYPE_WRCOMB) && !have_wrcomb()) { if ((type == MTRR_TYPE_WRCOMB) && !have_wrcomb()) {
printk(KERN_WARNING pr_warning("mtrr: your processor doesn't support write-combining\n");
"mtrr: your processor doesn't support write-combining\n");
return -ENOSYS; return -ENOSYS;
} }
if (!size) { if (!size) {
printk(KERN_WARNING "mtrr: zero sized request\n"); pr_warning("mtrr: zero sized request\n");
return -EINVAL; return -EINVAL;
} }
if (base & size_or_mask || size & size_or_mask) { if (base & size_or_mask || size & size_or_mask) {
printk(KERN_WARNING "mtrr: base or size exceeds the MTRR width\n"); pr_warning("mtrr: base or size exceeds the MTRR width\n");
return -EINVAL; return -EINVAL;
} }
@ -341,25 +359,29 @@ int mtrr_add_page(unsigned long base, unsigned long size,
/* No CPU hotplug when we change MTRR entries */ /* No CPU hotplug when we change MTRR entries */
get_online_cpus(); get_online_cpus();
/* Search for existing MTRR */ /* Search for existing MTRR */
mutex_lock(&mtrr_mutex); mutex_lock(&mtrr_mutex);
for (i = 0; i < num_var_ranges; ++i) { for (i = 0; i < num_var_ranges; ++i) {
mtrr_if->get(i, &lbase, &lsize, &ltype); mtrr_if->get(i, &lbase, &lsize, &ltype);
if (!lsize || base > lbase + lsize - 1 || base + size - 1 < lbase) if (!lsize || base > lbase + lsize - 1 ||
base + size - 1 < lbase)
continue; continue;
/* At this point we know there is some kind of overlap/enclosure */ /*
* At this point we know there is some kind of
* overlap/enclosure
*/
if (base < lbase || base + size - 1 > lbase + lsize - 1) { if (base < lbase || base + size - 1 > lbase + lsize - 1) {
if (base <= lbase && base + size - 1 >= lbase + lsize - 1) { if (base <= lbase &&
base + size - 1 >= lbase + lsize - 1) {
/* New region encloses an existing region */ /* New region encloses an existing region */
if (type == ltype) { if (type == ltype) {
replace = replace == -1 ? i : -2; replace = replace == -1 ? i : -2;
continue; continue;
} } else if (types_compatible(type, ltype))
else if (types_compatible(type, ltype))
continue; continue;
} }
printk(KERN_WARNING pr_warning("mtrr: 0x%lx000,0x%lx000 overlaps existing"
"mtrr: 0x%lx000,0x%lx000 overlaps existing"
" 0x%lx000,0x%lx000\n", base, size, lbase, " 0x%lx000,0x%lx000\n", base, size, lbase,
lsize); lsize);
goto out; goto out;
@ -368,7 +390,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
if (ltype != type) { if (ltype != type) {
if (types_compatible(type, ltype)) if (types_compatible(type, ltype))
continue; continue;
printk (KERN_WARNING "mtrr: type mismatch for %lx000,%lx000 old: %s new: %s\n", pr_warning("mtrr: type mismatch for %lx000,%lx000 old: %s new: %s\n",
base, size, mtrr_attrib_to_str(ltype), base, size, mtrr_attrib_to_str(ltype),
mtrr_attrib_to_str(type)); mtrr_attrib_to_str(type));
goto out; goto out;
@ -393,8 +415,9 @@ int mtrr_add_page(unsigned long base, unsigned long size,
mtrr_usage_table[replace] = 0; mtrr_usage_table[replace] = 0;
} }
} }
} else } else {
printk(KERN_INFO "mtrr: no more MTRRs available\n"); pr_info("mtrr: no more MTRRs available\n");
}
error = i; error = i;
out: out:
mutex_unlock(&mtrr_mutex); mutex_unlock(&mtrr_mutex);
@ -405,10 +428,8 @@ int mtrr_add_page(unsigned long base, unsigned long size,
static int mtrr_check(unsigned long base, unsigned long size) static int mtrr_check(unsigned long base, unsigned long size)
{ {
if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) { if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
printk(KERN_WARNING pr_warning("mtrr: size and base must be multiples of 4 kiB\n");
"mtrr: size and base must be multiples of 4 kiB\n"); pr_debug("mtrr: size: 0x%lx base: 0x%lx\n", size, base);
printk(KERN_DEBUG
"mtrr: size: 0x%lx base: 0x%lx\n", size, base);
dump_stack(); dump_stack();
return -1; return -1;
} }
@ -450,9 +471,7 @@ static int mtrr_check(unsigned long base, unsigned long size)
* BUGS: Needs a quiet flag for the cases where drivers do not mind * BUGS: Needs a quiet flag for the cases where drivers do not mind
* failures and do not wish system log messages to be sent. * failures and do not wish system log messages to be sent.
*/ */
int mtrr_add(unsigned long base, unsigned long size, unsigned int type,
int
mtrr_add(unsigned long base, unsigned long size, unsigned int type,
bool increment) bool increment)
{ {
if (mtrr_check(base, size)) if (mtrr_check(base, size))
@ -460,6 +479,7 @@ mtrr_add(unsigned long base, unsigned long size, unsigned int type,
return mtrr_add_page(base >> PAGE_SHIFT, size >> PAGE_SHIFT, type, return mtrr_add_page(base >> PAGE_SHIFT, size >> PAGE_SHIFT, type,
increment); increment);
} }
EXPORT_SYMBOL(mtrr_add);
/** /**
* mtrr_del_page - delete a memory type region * mtrr_del_page - delete a memory type region
@ -475,7 +495,6 @@ mtrr_add(unsigned long base, unsigned long size, unsigned int type,
* On success the register is returned, on failure a negative error * On success the register is returned, on failure a negative error
* code. * code.
*/ */
int mtrr_del_page(int reg, unsigned long base, unsigned long size) int mtrr_del_page(int reg, unsigned long base, unsigned long size)
{ {
int i, max; int i, max;
@ -500,22 +519,22 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
} }
} }
if (reg < 0) { if (reg < 0) {
printk(KERN_DEBUG "mtrr: no MTRR for %lx000,%lx000 found\n", base, pr_debug("mtrr: no MTRR for %lx000,%lx000 found\n",
size); base, size);
goto out; goto out;
} }
} }
if (reg >= max) { if (reg >= max) {
printk(KERN_WARNING "mtrr: register: %d too big\n", reg); pr_warning("mtrr: register: %d too big\n", reg);
goto out; goto out;
} }
mtrr_if->get(reg, &lbase, &lsize, &ltype); mtrr_if->get(reg, &lbase, &lsize, &ltype);
if (lsize < 1) { if (lsize < 1) {
printk(KERN_WARNING "mtrr: MTRR %d not used\n", reg); pr_warning("mtrr: MTRR %d not used\n", reg);
goto out; goto out;
} }
if (mtrr_usage_table[reg] < 1) { if (mtrr_usage_table[reg] < 1) {
printk(KERN_WARNING "mtrr: reg: %d has count=0\n", reg); pr_warning("mtrr: reg: %d has count=0\n", reg);
goto out; goto out;
} }
if (--mtrr_usage_table[reg] < 1) if (--mtrr_usage_table[reg] < 1)
@ -526,6 +545,7 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
put_online_cpus(); put_online_cpus();
return error; return error;
} }
/** /**
* mtrr_del - delete a memory type region * mtrr_del - delete a memory type region
* @reg: Register returned by mtrr_add * @reg: Register returned by mtrr_add
@ -540,19 +560,16 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
* On success the register is returned, on failure a negative error * On success the register is returned, on failure a negative error
* code. * code.
*/ */
int mtrr_del(int reg, unsigned long base, unsigned long size)
int
mtrr_del(int reg, unsigned long base, unsigned long size)
{ {
if (mtrr_check(base, size)) if (mtrr_check(base, size))
return -EINVAL; return -EINVAL;
return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT); return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
} }
EXPORT_SYMBOL(mtrr_add);
EXPORT_SYMBOL(mtrr_del); EXPORT_SYMBOL(mtrr_del);
/* HACK ALERT! /*
* HACK ALERT!
* These should be called implicitly, but we can't yet until all the initcall * These should be called implicitly, but we can't yet until all the initcall
* stuff is done... * stuff is done...
*/ */
@ -581,8 +598,7 @@ static int mtrr_save(struct sys_device * sysdev, pm_message_t state)
int i; int i;
for (i = 0; i < num_var_ranges; i++) { for (i = 0; i < num_var_ranges; i++) {
mtrr_if->get(i, mtrr_if->get(i, &mtrr_value[i].lbase,
&mtrr_value[i].lbase,
&mtrr_value[i].lsize, &mtrr_value[i].lsize,
&mtrr_value[i].ltype); &mtrr_value[i].ltype);
} }
@ -594,12 +610,12 @@ static int mtrr_restore(struct sys_device * sysdev)
int i; int i;
for (i = 0; i < num_var_ranges; i++) { for (i = 0; i < num_var_ranges; i++) {
if (mtrr_value[i].lsize) if (mtrr_value[i].lsize) {
set_mtrr(i, set_mtrr(i, mtrr_value[i].lbase,
mtrr_value[i].lbase,
mtrr_value[i].lsize, mtrr_value[i].lsize,
mtrr_value[i].ltype); mtrr_value[i].ltype);
} }
}
return 0; return 0;
} }
@ -622,6 +638,7 @@ int __initdata changed_by_mtrr_cleanup;
void __init mtrr_bp_init(void) void __init mtrr_bp_init(void)
{ {
u32 phys_addr; u32 phys_addr;
init_ifs(); init_ifs();
phys_addr = 32; phys_addr = 32;
@ -632,9 +649,11 @@ void __init mtrr_bp_init(void)
size_and_mask = 0x00f00000; size_and_mask = 0x00f00000;
phys_addr = 36; phys_addr = 36;
/* This is an AMD specific MSR, but we assume(hope?) that /*
Intel will implement it to when they extend the address * This is an AMD specific MSR, but we assume(hope?) that
bus of the Xeon. */ * Intel will implement it to when they extend the address
* bus of the Xeon.
*/
if (cpuid_eax(0x80000000) >= 0x80000008) { if (cpuid_eax(0x80000000) >= 0x80000008) {
phys_addr = cpuid_eax(0x80000008) & 0xff; phys_addr = cpuid_eax(0x80000008) & 0xff;
/* CPUID workaround for Intel 0F33/0F34 CPU */ /* CPUID workaround for Intel 0F33/0F34 CPU */
@ -649,8 +668,10 @@ void __init mtrr_bp_init(void)
size_and_mask = ~size_or_mask & 0xfffff00000ULL; size_and_mask = ~size_or_mask & 0xfffff00000ULL;
} else if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR && } else if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR &&
boot_cpu_data.x86 == 6) { boot_cpu_data.x86 == 6) {
/* VIA C* family have Intel style MTRRs, but /*
don't support PAE */ * VIA C* family have Intel style MTRRs,
* but don't support PAE
*/
size_or_mask = 0xfff00000; /* 32 bits */ size_or_mask = 0xfff00000; /* 32 bits */
size_and_mask = 0; size_and_mask = 0;
phys_addr = 32; phys_addr = 32;
@ -694,7 +715,6 @@ void __init mtrr_bp_init(void)
changed_by_mtrr_cleanup = 1; changed_by_mtrr_cleanup = 1;
mtrr_if->set_all(); mtrr_if->set_all();
} }
} }
} }
} }
@ -706,12 +726,17 @@ void mtrr_ap_init(void)
if (!mtrr_if || !use_intel()) if (!mtrr_if || !use_intel())
return; return;
/* /*
* Ideally we should hold mtrr_mutex here to avoid mtrr entries changed, * Ideally we should hold mtrr_mutex here to avoid mtrr entries
* but this routine will be called in cpu boot time, holding the lock * changed, but this routine will be called in cpu boot time,
* breaks it. This routine is called in two cases: 1.very earily time * holding the lock breaks it.
* of software resume, when there absolutely isn't mtrr entry changes; *
* 2.cpu hotadd time. We let mtrr_add/del_page hold cpuhotplug lock to * This routine is called in two cases:
* prevent mtrr entry changes *
* 1. very earily time of software resume, when there absolutely
* isn't mtrr entry changes;
*
* 2. cpu hotadd time. We let mtrr_add/del_page hold cpuhotplug
* lock to prevent mtrr entry changes
*/ */
local_irq_save(flags); local_irq_save(flags);
@ -732,19 +757,23 @@ static int __init mtrr_init_finialize(void)
{ {
if (!mtrr_if) if (!mtrr_if)
return 0; return 0;
if (use_intel()) { if (use_intel()) {
if (!changed_by_mtrr_cleanup) if (!changed_by_mtrr_cleanup)
mtrr_state_warn(); mtrr_state_warn();
} else { return 0;
/* The CPUs haven't MTRR and seem to not support SMP. They have }
/*
* The CPU has no MTRR and seems to not support SMP. They have
* specific drivers, we use a tricky method to support * specific drivers, we use a tricky method to support
* suspend/resume for them. * suspend/resume for them.
*
* TBD: is there any system with such CPU which supports * TBD: is there any system with such CPU which supports
* suspend/resume? if no, we should remove the code. * suspend/resume? If no, we should remove the code.
*/ */
sysdev_driver_register(&cpu_sysdev_class, sysdev_driver_register(&cpu_sysdev_class, &mtrr_sysdev_driver);
&mtrr_sysdev_driver);
}
return 0; return 0;
} }
subsys_initcall(mtrr_init_finialize); subsys_initcall(mtrr_init_finialize);