x86: simplify pageattr_64.c
simplify pageattr_64.c. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar
Родитель
a5f55035f6
Коммит
d6ee09a2a0
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@ -9,6 +9,14 @@
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#include <linux/slab.h>
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#include <linux/mm.h>
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void clflush_cache_range(void *addr, int size)
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{
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int i;
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for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
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clflush(addr+i);
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}
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#include <asm/processor.h>
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#include <asm/tlbflush.h>
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#include <asm/uaccess.h>
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@ -47,12 +55,6 @@ split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
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base = alloc_pages(GFP_KERNEL, 0);
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if (!base)
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return NULL;
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/*
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* page_private is used to track the number of entries in
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* the page table page have non standard attributes.
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*/
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SetPagePrivate(base);
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page_private(base) = 0;
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address = __pa(address);
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addr = address & LARGE_PAGE_MASK;
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@ -64,80 +66,13 @@ split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
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return base;
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}
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void clflush_cache_range(void *addr, int size)
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{
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int i;
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for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
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clflush(addr+i);
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}
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static void flush_kernel_map(void *arg)
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{
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struct list_head *l = (struct list_head *)arg;
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struct page *pg;
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__flush_tlb_all();
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/* When clflush is available always use it because it is
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much cheaper than WBINVD. */
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/* clflush is still broken. Disable for now. */
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if (1 || !cpu_has_clflush) {
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wbinvd();
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} else {
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list_for_each_entry(pg, l, lru) {
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void *addr = page_address(pg);
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clflush_cache_range(addr, PAGE_SIZE);
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}
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}
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}
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static inline void flush_map(struct list_head *l)
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{
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on_each_cpu(flush_kernel_map, l, 1, 1);
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}
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static LIST_HEAD(deferred_pages); /* protected by init_mm.mmap_sem */
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static inline void save_page(struct page *fpage)
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{
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if (!test_and_set_bit(PG_arch_1, &fpage->flags))
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list_add(&fpage->lru, &deferred_pages);
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}
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/*
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* No more special protections in this 2/4MB area - revert to a
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* large page again.
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*/
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static void revert_page(unsigned long address, pgprot_t ref_prot)
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{
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unsigned long pfn;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t large_pte;
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pgd = pgd_offset_k(address);
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BUG_ON(pgd_none(*pgd));
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pud = pud_offset(pgd, address);
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BUG_ON(pud_none(*pud));
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pmd = pmd_offset(pud, address);
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BUG_ON(pmd_val(*pmd) & _PAGE_PSE);
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pfn = (__pa(address) & LARGE_PAGE_MASK) >> PAGE_SHIFT;
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large_pte = pfn_pte(pfn, ref_prot);
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large_pte = pte_mkhuge(large_pte);
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set_pte((pte_t *)pmd, large_pte);
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}
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static int
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__change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
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pgprot_t ref_prot)
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{
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struct page *kpte_page;
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pgprot_t ref_prot2;
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pte_t *kpte;
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pgprot_t ref_prot2, oldprot;
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int level;
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kpte = lookup_address(address, &level);
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@ -145,8 +80,12 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
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return 0;
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kpte_page = virt_to_page(kpte);
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oldprot = pte_pgprot(*kpte);
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BUG_ON(PageLRU(kpte_page));
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BUG_ON(PageCompound(kpte_page));
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ref_prot = canon_pgprot(ref_prot);
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prot = canon_pgprot(prot);
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if (pgprot_val(prot) != pgprot_val(ref_prot)) {
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if (level == 4) {
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set_pte(kpte, pfn_pte(pfn, prot));
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@ -165,38 +104,29 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
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set_pte(kpte, mk_pte(split, ref_prot2));
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kpte_page = split;
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}
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page_private(kpte_page)++;
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} else {
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if (level == 4) {
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set_pte(kpte, pfn_pte(pfn, ref_prot));
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BUG_ON(page_private(kpte_page) == 0);
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page_private(kpte_page)--;
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} else
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BUG();
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}
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/* on x86-64 the direct mapping set at boot is not using 4k pages */
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BUG_ON(PageReserved(kpte_page));
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save_page(kpte_page);
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if (page_private(kpte_page) == 0)
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revert_page(address, ref_prot);
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return 0;
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}
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/*
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* Change the page attributes of an page in the linear mapping.
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/**
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* change_page_attr_addr - Change page table attributes in linear mapping
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* @address: Virtual address in linear mapping.
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* @numpages: Number of pages to change
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* @prot: New page table attribute (PAGE_*)
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*
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* This should be used when a page is mapped with a different caching policy
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* than write-back somewhere - some CPUs do not like it when mappings with
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* different caching policies exist. This changes the page attributes of the
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* in kernel linear mapping too.
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* Change page attributes of a page in the direct mapping. This is a variant
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* of change_page_attr() that also works on memory holes that do not have
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* mem_map entry (pfn_valid() is false).
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*
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* The caller needs to ensure that there are no conflicting mappings elsewhere.
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* This function only deals with the kernel linear map.
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*
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* Caller must call global_flush_tlb() after this.
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* See change_page_attr() documentation for more details.
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*/
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int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
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{
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int err = 0, kernel_map = 0, i;
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@ -236,7 +166,26 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
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return err;
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}
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/* Don't call this for MMIO areas that may not have a mem_map entry */
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/**
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* change_page_attr - Change page table attributes in the linear mapping.
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* @page: First page to change
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* @numpages: Number of pages to change
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* @prot: New protection/caching type (PAGE_*)
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*
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* Returns 0 on success, otherwise a negated errno.
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*
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* This should be used when a page is mapped with a different caching policy
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* than write-back somewhere - some CPUs do not like it when mappings with
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* different caching policies exist. This changes the page attributes of the
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* in kernel linear mapping too.
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*
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* Caller must call global_flush_tlb() later to make the changes active.
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*
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* The caller needs to ensure that there are no conflicting mappings elsewhere
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* (e.g. in user space) * This function only deals with the kernel linear map.
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*
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* For MMIO areas without mem_map use change_page_attr_addr() instead.
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*/
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int change_page_attr(struct page *page, int numpages, pgprot_t prot)
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{
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unsigned long addr = (unsigned long)page_address(page);
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@ -245,29 +194,22 @@ int change_page_attr(struct page *page, int numpages, pgprot_t prot)
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}
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EXPORT_SYMBOL(change_page_attr);
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static void flush_kernel_map(void *arg)
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{
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/*
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* Flush all to work around Errata in early athlons regarding
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* large page flushing.
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*/
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__flush_tlb_all();
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if (boot_cpu_data.x86_model >= 4)
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wbinvd();
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}
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void global_flush_tlb(void)
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{
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struct page *pg, *next;
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struct list_head l;
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BUG_ON(irqs_disabled());
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/*
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* Write-protect the semaphore, to exclude two contexts
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* doing a list_replace_init() call in parallel and to
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* exclude new additions to the deferred_pages list:
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*/
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down_write(&init_mm.mmap_sem);
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list_replace_init(&deferred_pages, &l);
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up_write(&init_mm.mmap_sem);
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flush_map(&l);
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list_for_each_entry_safe(pg, next, &l, lru) {
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list_del(&pg->lru);
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clear_bit(PG_arch_1, &pg->flags);
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if (page_private(pg) != 0)
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continue;
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ClearPagePrivate(pg);
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__free_page(pg);
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}
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on_each_cpu(flush_kernel_map, NULL, 1, 1);
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}
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EXPORT_SYMBOL(global_flush_tlb);
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