x86: clean up arch/x86/mm/pageattr_32.c
clean up arch/x86/mm/pageattr_32.c. no code changed: text data bss dec hex filename 1255 40 0 1295 50f pageattr_32.o.before 1255 40 0 1295 50f pageattr_32.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
parent
6371b49599
commit
9f4c815ce7
1 changed files with 83 additions and 68 deletions
|
@ -1,28 +1,29 @@
|
|||
/*
|
||||
* Copyright 2002 Andi Kleen, SuSE Labs.
|
||||
/*
|
||||
* Copyright 2002 Andi Kleen, SuSE Labs.
|
||||
* Thanks to Ben LaHaise for precious feedback.
|
||||
*/
|
||||
*/
|
||||
|
||||
#include <linux/mm.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/slab.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/mm.h>
|
||||
|
||||
#include <asm/processor.h>
|
||||
#include <asm/tlbflush.h>
|
||||
#include <asm/pgalloc.h>
|
||||
#include <asm/sections.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/pgalloc.h>
|
||||
|
||||
static DEFINE_SPINLOCK(cpa_lock);
|
||||
static struct list_head df_list = LIST_HEAD_INIT(df_list);
|
||||
|
||||
|
||||
pte_t *lookup_address(unsigned long address)
|
||||
{
|
||||
pte_t *lookup_address(unsigned long address)
|
||||
{
|
||||
pgd_t *pgd = pgd_offset_k(address);
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
|
||||
if (pgd_none(*pgd))
|
||||
return NULL;
|
||||
pud = pud_offset(pgd, address);
|
||||
|
@ -33,21 +34,22 @@ pte_t *lookup_address(unsigned long address)
|
|||
return NULL;
|
||||
if (pmd_large(*pmd))
|
||||
return (pte_t *)pmd;
|
||||
return pte_offset_kernel(pmd, address);
|
||||
}
|
||||
|
||||
static struct page *split_large_page(unsigned long address, pgprot_t prot,
|
||||
pgprot_t ref_prot)
|
||||
{
|
||||
int i;
|
||||
return pte_offset_kernel(pmd, address);
|
||||
}
|
||||
|
||||
static struct page *
|
||||
split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
|
||||
{
|
||||
unsigned long addr;
|
||||
struct page *base;
|
||||
pte_t *pbase;
|
||||
int i;
|
||||
|
||||
spin_unlock_irq(&cpa_lock);
|
||||
base = alloc_pages(GFP_KERNEL, 0);
|
||||
spin_lock_irq(&cpa_lock);
|
||||
if (!base)
|
||||
if (!base)
|
||||
return NULL;
|
||||
|
||||
/*
|
||||
|
@ -58,22 +60,24 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
|
|||
page_private(base) = 0;
|
||||
|
||||
address = __pa(address);
|
||||
addr = address & LARGE_PAGE_MASK;
|
||||
addr = address & LARGE_PAGE_MASK;
|
||||
pbase = (pte_t *)page_address(base);
|
||||
paravirt_alloc_pt(&init_mm, page_to_pfn(base));
|
||||
|
||||
for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
|
||||
set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT,
|
||||
addr == address ? prot : ref_prot));
|
||||
set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT,
|
||||
addr == address ? prot : ref_prot));
|
||||
}
|
||||
return base;
|
||||
}
|
||||
}
|
||||
|
||||
static void cache_flush_page(struct page *p)
|
||||
{
|
||||
void *adr = page_address(p);
|
||||
{
|
||||
void *addr = page_address(p);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
|
||||
clflush(adr+i);
|
||||
clflush(addr + i);
|
||||
}
|
||||
|
||||
static void flush_kernel_map(void *arg)
|
||||
|
@ -83,23 +87,27 @@ static void flush_kernel_map(void *arg)
|
|||
|
||||
/* High level code is not ready for clflush yet */
|
||||
if (0 && cpu_has_clflush) {
|
||||
list_for_each_entry (p, lh, lru)
|
||||
list_for_each_entry(p, lh, lru)
|
||||
cache_flush_page(p);
|
||||
} else if (boot_cpu_data.x86_model >= 4)
|
||||
wbinvd();
|
||||
} else {
|
||||
if (boot_cpu_data.x86_model >= 4)
|
||||
wbinvd();
|
||||
}
|
||||
|
||||
/* Flush all to work around Errata in early athlons regarding
|
||||
* large page flushing.
|
||||
/*
|
||||
* Flush all to work around Errata in early athlons regarding
|
||||
* large page flushing.
|
||||
*/
|
||||
__flush_tlb_all();
|
||||
__flush_tlb_all();
|
||||
}
|
||||
|
||||
static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
|
||||
{
|
||||
struct page *page;
|
||||
static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct page *page;
|
||||
|
||||
set_pte_atomic(kpte, pte); /* change init_mm */
|
||||
/* change init_mm */
|
||||
set_pte_atomic(kpte, pte);
|
||||
if (SHARED_KERNEL_PMD)
|
||||
return;
|
||||
|
||||
|
@ -108,6 +116,7 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
|
|||
pgd_t *pgd;
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
|
||||
pgd = (pgd_t *)page_address(page) + pgd_index(address);
|
||||
pud = pud_offset(pgd, address);
|
||||
pmd = pmd_offset(pud, address);
|
||||
|
@ -116,9 +125,9 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
|
|||
spin_unlock_irqrestore(&pgd_lock, flags);
|
||||
}
|
||||
|
||||
/*
|
||||
* No more special protections in this 2/4MB area - revert to a
|
||||
* large page again.
|
||||
/*
|
||||
* No more special protections in this 2/4MB area - revert to a large
|
||||
* page again.
|
||||
*/
|
||||
static inline void revert_page(struct page *kpte_page, unsigned long address)
|
||||
{
|
||||
|
@ -142,12 +151,11 @@ static inline void save_page(struct page *kpte_page)
|
|||
list_add(&kpte_page->lru, &df_list);
|
||||
}
|
||||
|
||||
static int
|
||||
__change_page_attr(struct page *page, pgprot_t prot)
|
||||
{
|
||||
pte_t *kpte;
|
||||
unsigned long address;
|
||||
static int __change_page_attr(struct page *page, pgprot_t prot)
|
||||
{
|
||||
struct page *kpte_page;
|
||||
unsigned long address;
|
||||
pte_t *kpte;
|
||||
|
||||
BUG_ON(PageHighMem(page));
|
||||
address = (unsigned long)page_address(page);
|
||||
|
@ -155,16 +163,17 @@ __change_page_attr(struct page *page, pgprot_t prot)
|
|||
kpte = lookup_address(address);
|
||||
if (!kpte)
|
||||
return -EINVAL;
|
||||
|
||||
kpte_page = virt_to_page(kpte);
|
||||
BUG_ON(PageLRU(kpte_page));
|
||||
BUG_ON(PageCompound(kpte_page));
|
||||
|
||||
if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) {
|
||||
if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) {
|
||||
if (!pte_huge(*kpte)) {
|
||||
set_pte_atomic(kpte, mk_pte(page, prot));
|
||||
set_pte_atomic(kpte, mk_pte(page, prot));
|
||||
} else {
|
||||
pgprot_t ref_prot;
|
||||
struct page *split;
|
||||
pgprot_t ref_prot;
|
||||
|
||||
ref_prot =
|
||||
((address & LARGE_PAGE_MASK) < (unsigned long)&_etext)
|
||||
|
@ -172,16 +181,19 @@ __change_page_attr(struct page *page, pgprot_t prot)
|
|||
split = split_large_page(address, prot, ref_prot);
|
||||
if (!split)
|
||||
return -ENOMEM;
|
||||
set_pmd_pte(kpte,address,mk_pte(split, ref_prot));
|
||||
|
||||
set_pmd_pte(kpte, address, mk_pte(split, ref_prot));
|
||||
kpte_page = split;
|
||||
}
|
||||
page_private(kpte_page)++;
|
||||
} else if (!pte_huge(*kpte)) {
|
||||
set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
|
||||
BUG_ON(page_private(kpte_page) == 0);
|
||||
page_private(kpte_page)--;
|
||||
} else
|
||||
BUG();
|
||||
} else {
|
||||
if (!pte_huge(*kpte)) {
|
||||
set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
|
||||
BUG_ON(page_private(kpte_page) == 0);
|
||||
page_private(kpte_page)--;
|
||||
} else
|
||||
BUG();
|
||||
}
|
||||
|
||||
/*
|
||||
* If the pte was reserved, it means it was created at boot
|
||||
|
@ -197,7 +209,7 @@ __change_page_attr(struct page *page, pgprot_t prot)
|
|||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static inline void flush_map(struct list_head *l)
|
||||
{
|
||||
|
@ -211,32 +223,33 @@ static inline void flush_map(struct list_head *l)
|
|||
* than write-back somewhere - some CPUs do not like it when mappings with
|
||||
* different caching policies exist. This changes the page attributes of the
|
||||
* in kernel linear mapping too.
|
||||
*
|
||||
*
|
||||
* The caller needs to ensure that there are no conflicting mappings elsewhere.
|
||||
* This function only deals with the kernel linear map.
|
||||
*
|
||||
*
|
||||
* Caller must call global_flush_tlb() after this.
|
||||
*/
|
||||
int change_page_attr(struct page *page, int numpages, pgprot_t prot)
|
||||
{
|
||||
int err = 0;
|
||||
int i;
|
||||
unsigned long flags;
|
||||
int err = 0, i;
|
||||
|
||||
spin_lock_irqsave(&cpa_lock, flags);
|
||||
for (i = 0; i < numpages; i++, page++) {
|
||||
for (i = 0; i < numpages; i++, page++) {
|
||||
err = __change_page_attr(page, prot);
|
||||
if (err)
|
||||
break;
|
||||
}
|
||||
if (err)
|
||||
break;
|
||||
}
|
||||
spin_unlock_irqrestore(&cpa_lock, flags);
|
||||
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(change_page_attr);
|
||||
|
||||
void global_flush_tlb(void)
|
||||
{
|
||||
struct list_head l;
|
||||
struct page *pg, *next;
|
||||
struct list_head l;
|
||||
|
||||
BUG_ON(irqs_disabled());
|
||||
|
||||
|
@ -253,26 +266,28 @@ void global_flush_tlb(void)
|
|||
__free_page(pg);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(global_flush_tlb);
|
||||
|
||||
#ifdef CONFIG_DEBUG_PAGEALLOC
|
||||
void kernel_map_pages(struct page *page, int numpages, int enable)
|
||||
{
|
||||
if (PageHighMem(page))
|
||||
return;
|
||||
if (!enable)
|
||||
if (!enable) {
|
||||
debug_check_no_locks_freed(page_address(page),
|
||||
numpages * PAGE_SIZE);
|
||||
}
|
||||
|
||||
/* the return value is ignored - the calls cannot fail,
|
||||
/*
|
||||
* the return value is ignored - the calls cannot fail,
|
||||
* large pages are disabled at boot time.
|
||||
*/
|
||||
change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
|
||||
/* we should perform an IPI and flush all tlbs,
|
||||
|
||||
/*
|
||||
* we should perform an IPI and flush all tlbs,
|
||||
* but that can deadlock->flush only current cpu.
|
||||
*/
|
||||
__flush_tlb_all();
|
||||
}
|
||||
#endif
|
||||
|
||||
EXPORT_SYMBOL(change_page_attr);
|
||||
EXPORT_SYMBOL(global_flush_tlb);
|
||||
|
|
Loading…
Add table
Reference in a new issue