diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/x86/mm/pageattr.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/x86/mm/pageattr.c | 1377 |
1 files changed, 0 insertions, 1377 deletions
diff --git a/ANDROID_3.4.5/arch/x86/mm/pageattr.c b/ANDROID_3.4.5/arch/x86/mm/pageattr.c deleted file mode 100644 index e1ebde31..00000000 --- a/ANDROID_3.4.5/arch/x86/mm/pageattr.c +++ /dev/null @@ -1,1377 +0,0 @@ -/* - * Copyright 2002 Andi Kleen, SuSE Labs. - * Thanks to Ben LaHaise for precious feedback. - */ -#include <linux/highmem.h> -#include <linux/bootmem.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/interrupt.h> -#include <linux/seq_file.h> -#include <linux/debugfs.h> -#include <linux/pfn.h> -#include <linux/percpu.h> -#include <linux/gfp.h> -#include <linux/pci.h> - -#include <asm/e820.h> -#include <asm/processor.h> -#include <asm/tlbflush.h> -#include <asm/sections.h> -#include <asm/setup.h> -#include <asm/uaccess.h> -#include <asm/pgalloc.h> -#include <asm/proto.h> -#include <asm/pat.h> - -/* - * The current flushing context - we pass it instead of 5 arguments: - */ -struct cpa_data { - unsigned long *vaddr; - pgprot_t mask_set; - pgprot_t mask_clr; - int numpages; - int flags; - unsigned long pfn; - unsigned force_split : 1; - int curpage; - struct page **pages; -}; - -/* - * Serialize cpa() (for !DEBUG_PAGEALLOC which uses large identity mappings) - * using cpa_lock. So that we don't allow any other cpu, with stale large tlb - * entries change the page attribute in parallel to some other cpu - * splitting a large page entry along with changing the attribute. - */ -static DEFINE_SPINLOCK(cpa_lock); - -#define CPA_FLUSHTLB 1 -#define CPA_ARRAY 2 -#define CPA_PAGES_ARRAY 4 - -#ifdef CONFIG_PROC_FS -static unsigned long direct_pages_count[PG_LEVEL_NUM]; - -void update_page_count(int level, unsigned long pages) -{ - /* Protect against CPA */ - spin_lock(&pgd_lock); - direct_pages_count[level] += pages; - spin_unlock(&pgd_lock); -} - -static void split_page_count(int level) -{ - direct_pages_count[level]--; - direct_pages_count[level - 1] += PTRS_PER_PTE; -} - -void arch_report_meminfo(struct seq_file *m) -{ - seq_printf(m, "DirectMap4k: %8lu kB\n", - direct_pages_count[PG_LEVEL_4K] << 2); -#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) - seq_printf(m, "DirectMap2M: %8lu kB\n", - direct_pages_count[PG_LEVEL_2M] << 11); -#else - seq_printf(m, "DirectMap4M: %8lu kB\n", - direct_pages_count[PG_LEVEL_2M] << 12); -#endif -#ifdef CONFIG_X86_64 - if (direct_gbpages) - seq_printf(m, "DirectMap1G: %8lu kB\n", - direct_pages_count[PG_LEVEL_1G] << 20); -#endif -} -#else -static inline void split_page_count(int level) { } -#endif - -#ifdef CONFIG_X86_64 - -static inline unsigned long highmap_start_pfn(void) -{ - return __pa(_text) >> PAGE_SHIFT; -} - -static inline unsigned long highmap_end_pfn(void) -{ - return __pa(roundup(_brk_end, PMD_SIZE)) >> PAGE_SHIFT; -} - -#endif - -#ifdef CONFIG_DEBUG_PAGEALLOC -# define debug_pagealloc 1 -#else -# define debug_pagealloc 0 -#endif - -static inline int -within(unsigned long addr, unsigned long start, unsigned long end) -{ - return addr >= start && addr < end; -} - -/* - * Flushing functions - */ - -/** - * clflush_cache_range - flush a cache range with clflush - * @addr: virtual start address - * @size: number of bytes to flush - * - * clflush is an unordered instruction which needs fencing with mfence - * to avoid ordering issues. - */ -void clflush_cache_range(void *vaddr, unsigned int size) -{ - void *vend = vaddr + size - 1; - - mb(); - - for (; vaddr < vend; vaddr += boot_cpu_data.x86_clflush_size) - clflush(vaddr); - /* - * Flush any possible final partial cacheline: - */ - clflush(vend); - - mb(); -} -EXPORT_SYMBOL_GPL(clflush_cache_range); - -static void __cpa_flush_all(void *arg) -{ - unsigned long cache = (unsigned long)arg; - - /* - * Flush all to work around Errata in early athlons regarding - * large page flushing. - */ - __flush_tlb_all(); - - if (cache && boot_cpu_data.x86 >= 4) - wbinvd(); -} - -static void cpa_flush_all(unsigned long cache) -{ - BUG_ON(irqs_disabled()); - - on_each_cpu(__cpa_flush_all, (void *) cache, 1); -} - -static void __cpa_flush_range(void *arg) -{ - /* - * We could optimize that further and do individual per page - * tlb invalidates for a low number of pages. Caveat: we must - * flush the high aliases on 64bit as well. - */ - __flush_tlb_all(); -} - -static void cpa_flush_range(unsigned long start, int numpages, int cache) -{ - unsigned int i, level; - unsigned long addr; - - BUG_ON(irqs_disabled()); - WARN_ON(PAGE_ALIGN(start) != start); - - on_each_cpu(__cpa_flush_range, NULL, 1); - - if (!cache) - return; - - /* - * We only need to flush on one CPU, - * clflush is a MESI-coherent instruction that - * will cause all other CPUs to flush the same - * cachelines: - */ - for (i = 0, addr = start; i < numpages; i++, addr += PAGE_SIZE) { - pte_t *pte = lookup_address(addr, &level); - - /* - * Only flush present addresses: - */ - if (pte && (pte_val(*pte) & _PAGE_PRESENT)) - clflush_cache_range((void *) addr, PAGE_SIZE); - } -} - -static void cpa_flush_array(unsigned long *start, int numpages, int cache, - int in_flags, struct page **pages) -{ - unsigned int i, level; - unsigned long do_wbinvd = cache && numpages >= 1024; /* 4M threshold */ - - BUG_ON(irqs_disabled()); - - on_each_cpu(__cpa_flush_all, (void *) do_wbinvd, 1); - - if (!cache || do_wbinvd) - return; - - /* - * We only need to flush on one CPU, - * clflush is a MESI-coherent instruction that - * will cause all other CPUs to flush the same - * cachelines: - */ - for (i = 0; i < numpages; i++) { - unsigned long addr; - pte_t *pte; - - if (in_flags & CPA_PAGES_ARRAY) - addr = (unsigned long)page_address(pages[i]); - else - addr = start[i]; - - pte = lookup_address(addr, &level); - - /* - * Only flush present addresses: - */ - if (pte && (pte_val(*pte) & _PAGE_PRESENT)) - clflush_cache_range((void *)addr, PAGE_SIZE); - } -} - -/* - * Certain areas of memory on x86 require very specific protection flags, - * for example the BIOS area or kernel text. Callers don't always get this - * right (again, ioremap() on BIOS memory is not uncommon) so this function - * checks and fixes these known static required protection bits. - */ -static inline pgprot_t static_protections(pgprot_t prot, unsigned long address, - unsigned long pfn) -{ - pgprot_t forbidden = __pgprot(0); - - /* - * The BIOS area between 640k and 1Mb needs to be executable for - * PCI BIOS based config access (CONFIG_PCI_GOBIOS) support. - */ -#ifdef CONFIG_PCI_BIOS - if (pcibios_enabled && within(pfn, BIOS_BEGIN >> PAGE_SHIFT, BIOS_END >> PAGE_SHIFT)) - pgprot_val(forbidden) |= _PAGE_NX; -#endif - - /* - * The kernel text needs to be executable for obvious reasons - * Does not cover __inittext since that is gone later on. On - * 64bit we do not enforce !NX on the low mapping - */ - if (within(address, (unsigned long)_text, (unsigned long)_etext)) - pgprot_val(forbidden) |= _PAGE_NX; - - /* - * The .rodata section needs to be read-only. Using the pfn - * catches all aliases. - */ - if (within(pfn, __pa((unsigned long)__start_rodata) >> PAGE_SHIFT, - __pa((unsigned long)__end_rodata) >> PAGE_SHIFT)) - pgprot_val(forbidden) |= _PAGE_RW; - -#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA) - /* - * Once the kernel maps the text as RO (kernel_set_to_readonly is set), - * kernel text mappings for the large page aligned text, rodata sections - * will be always read-only. For the kernel identity mappings covering - * the holes caused by this alignment can be anything that user asks. - * - * This will preserve the large page mappings for kernel text/data - * at no extra cost. - */ - if (kernel_set_to_readonly && - within(address, (unsigned long)_text, - (unsigned long)__end_rodata_hpage_align)) { - unsigned int level; - - /* - * Don't enforce the !RW mapping for the kernel text mapping, - * if the current mapping is already using small page mapping. - * No need to work hard to preserve large page mappings in this - * case. - * - * This also fixes the Linux Xen paravirt guest boot failure - * (because of unexpected read-only mappings for kernel identity - * mappings). In this paravirt guest case, the kernel text - * mapping and the kernel identity mapping share the same - * page-table pages. Thus we can't really use different - * protections for the kernel text and identity mappings. Also, - * these shared mappings are made of small page mappings. - * Thus this don't enforce !RW mapping for small page kernel - * text mapping logic will help Linux Xen parvirt guest boot - * as well. - */ - if (lookup_address(address, &level) && (level != PG_LEVEL_4K)) - pgprot_val(forbidden) |= _PAGE_RW; - } -#endif - - prot = __pgprot(pgprot_val(prot) & ~pgprot_val(forbidden)); - - return prot; -} - -/* - * Lookup the page table entry for a virtual address. Return a pointer - * to the entry and the level of the mapping. - * - * Note: We return pud and pmd either when the entry is marked large - * or when the present bit is not set. Otherwise we would return a - * pointer to a nonexisting mapping. - */ -pte_t *lookup_address(unsigned long address, unsigned int *level) -{ - pgd_t *pgd = pgd_offset_k(address); - pud_t *pud; - pmd_t *pmd; - - *level = PG_LEVEL_NONE; - - if (pgd_none(*pgd)) - return NULL; - - pud = pud_offset(pgd, address); - if (pud_none(*pud)) - return NULL; - - *level = PG_LEVEL_1G; - if (pud_large(*pud) || !pud_present(*pud)) - return (pte_t *)pud; - - pmd = pmd_offset(pud, address); - if (pmd_none(*pmd)) - return NULL; - - *level = PG_LEVEL_2M; - if (pmd_large(*pmd) || !pmd_present(*pmd)) - return (pte_t *)pmd; - - *level = PG_LEVEL_4K; - - return pte_offset_kernel(pmd, address); -} -EXPORT_SYMBOL_GPL(lookup_address); - -/* - * Set the new pmd in all the pgds we know about: - */ -static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte) -{ - /* change init_mm */ - set_pte_atomic(kpte, pte); -#ifdef CONFIG_X86_32 - if (!SHARED_KERNEL_PMD) { - struct page *page; - - list_for_each_entry(page, &pgd_list, lru) { - 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); - set_pte_atomic((pte_t *)pmd, pte); - } - } -#endif -} - -static int -try_preserve_large_page(pte_t *kpte, unsigned long address, - struct cpa_data *cpa) -{ - unsigned long nextpage_addr, numpages, pmask, psize, addr, pfn; - pte_t new_pte, old_pte, *tmp; - pgprot_t old_prot, new_prot, req_prot; - int i, do_split = 1; - unsigned int level; - - if (cpa->force_split) - return 1; - - spin_lock(&pgd_lock); - /* - * Check for races, another CPU might have split this page - * up already: - */ - tmp = lookup_address(address, &level); - if (tmp != kpte) - goto out_unlock; - - switch (level) { - case PG_LEVEL_2M: - psize = PMD_PAGE_SIZE; - pmask = PMD_PAGE_MASK; - break; -#ifdef CONFIG_X86_64 - case PG_LEVEL_1G: - psize = PUD_PAGE_SIZE; - pmask = PUD_PAGE_MASK; - break; -#endif - default: - do_split = -EINVAL; - goto out_unlock; - } - - /* - * Calculate the number of pages, which fit into this large - * page starting at address: - */ - nextpage_addr = (address + psize) & pmask; - numpages = (nextpage_addr - address) >> PAGE_SHIFT; - if (numpages < cpa->numpages) - cpa->numpages = numpages; - - /* - * We are safe now. Check whether the new pgprot is the same: - */ - old_pte = *kpte; - old_prot = new_prot = req_prot = pte_pgprot(old_pte); - - pgprot_val(req_prot) &= ~pgprot_val(cpa->mask_clr); - pgprot_val(req_prot) |= pgprot_val(cpa->mask_set); - - /* - * old_pte points to the large page base address. So we need - * to add the offset of the virtual address: - */ - pfn = pte_pfn(old_pte) + ((address & (psize - 1)) >> PAGE_SHIFT); - cpa->pfn = pfn; - - new_prot = static_protections(req_prot, address, pfn); - - /* - * We need to check the full range, whether - * static_protection() requires a different pgprot for one of - * the pages in the range we try to preserve: - */ - addr = address & pmask; - pfn = pte_pfn(old_pte); - for (i = 0; i < (psize >> PAGE_SHIFT); i++, addr += PAGE_SIZE, pfn++) { - pgprot_t chk_prot = static_protections(req_prot, addr, pfn); - - if (pgprot_val(chk_prot) != pgprot_val(new_prot)) - goto out_unlock; - } - - /* - * If there are no changes, return. maxpages has been updated - * above: - */ - if (pgprot_val(new_prot) == pgprot_val(old_prot)) { - do_split = 0; - goto out_unlock; - } - - /* - * We need to change the attributes. Check, whether we can - * change the large page in one go. We request a split, when - * the address is not aligned and the number of pages is - * smaller than the number of pages in the large page. Note - * that we limited the number of possible pages already to - * the number of pages in the large page. - */ - if (address == (address & pmask) && cpa->numpages == (psize >> PAGE_SHIFT)) { - /* - * The address is aligned and the number of pages - * covers the full page. - */ - new_pte = pfn_pte(pte_pfn(old_pte), canon_pgprot(new_prot)); - __set_pmd_pte(kpte, address, new_pte); - cpa->flags |= CPA_FLUSHTLB; - do_split = 0; - } - -out_unlock: - spin_unlock(&pgd_lock); - - return do_split; -} - -static int split_large_page(pte_t *kpte, unsigned long address) -{ - unsigned long pfn, pfninc = 1; - unsigned int i, level; - pte_t *pbase, *tmp; - pgprot_t ref_prot; - struct page *base; - - if (!debug_pagealloc) - spin_unlock(&cpa_lock); - base = alloc_pages(GFP_KERNEL | __GFP_NOTRACK, 0); - if (!debug_pagealloc) - spin_lock(&cpa_lock); - if (!base) - return -ENOMEM; - - spin_lock(&pgd_lock); - /* - * Check for races, another CPU might have split this page - * up for us already: - */ - tmp = lookup_address(address, &level); - if (tmp != kpte) - goto out_unlock; - - pbase = (pte_t *)page_address(base); - paravirt_alloc_pte(&init_mm, page_to_pfn(base)); - ref_prot = pte_pgprot(pte_clrhuge(*kpte)); - /* - * If we ever want to utilize the PAT bit, we need to - * update this function to make sure it's converted from - * bit 12 to bit 7 when we cross from the 2MB level to - * the 4K level: - */ - WARN_ON_ONCE(pgprot_val(ref_prot) & _PAGE_PAT_LARGE); - -#ifdef CONFIG_X86_64 - if (level == PG_LEVEL_1G) { - pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT; - pgprot_val(ref_prot) |= _PAGE_PSE; - } -#endif - - /* - * Get the target pfn from the original entry: - */ - pfn = pte_pfn(*kpte); - for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc) - set_pte(&pbase[i], pfn_pte(pfn, ref_prot)); - - if (address >= (unsigned long)__va(0) && - address < (unsigned long)__va(max_low_pfn_mapped << PAGE_SHIFT)) - split_page_count(level); - -#ifdef CONFIG_X86_64 - if (address >= (unsigned long)__va(1UL<<32) && - address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT)) - split_page_count(level); -#endif - - /* - * Install the new, split up pagetable. - * - * We use the standard kernel pagetable protections for the new - * pagetable protections, the actual ptes set above control the - * primary protection behavior: - */ - __set_pmd_pte(kpte, address, mk_pte(base, __pgprot(_KERNPG_TABLE))); - - /* - * Intel Atom errata AAH41 workaround. - * - * The real fix should be in hw or in a microcode update, but - * we also probabilistically try to reduce the window of having - * a large TLB mixed with 4K TLBs while instruction fetches are - * going on. - */ - __flush_tlb_all(); - - base = NULL; - -out_unlock: - /* - * If we dropped out via the lookup_address check under - * pgd_lock then stick the page back into the pool: - */ - if (base) - __free_page(base); - spin_unlock(&pgd_lock); - - return 0; -} - -static int __cpa_process_fault(struct cpa_data *cpa, unsigned long vaddr, - int primary) -{ - /* - * Ignore all non primary paths. - */ - if (!primary) - return 0; - - /* - * Ignore the NULL PTE for kernel identity mapping, as it is expected - * to have holes. - * Also set numpages to '1' indicating that we processed cpa req for - * one virtual address page and its pfn. TBD: numpages can be set based - * on the initial value and the level returned by lookup_address(). - */ - if (within(vaddr, PAGE_OFFSET, - PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))) { - cpa->numpages = 1; - cpa->pfn = __pa(vaddr) >> PAGE_SHIFT; - return 0; - } else { - WARN(1, KERN_WARNING "CPA: called for zero pte. " - "vaddr = %lx cpa->vaddr = %lx\n", vaddr, - *cpa->vaddr); - - return -EFAULT; - } -} - -static int __change_page_attr(struct cpa_data *cpa, int primary) -{ - unsigned long address; - int do_split, err; - unsigned int level; - pte_t *kpte, old_pte; - - if (cpa->flags & CPA_PAGES_ARRAY) { - struct page *page = cpa->pages[cpa->curpage]; - if (unlikely(PageHighMem(page))) - return 0; - address = (unsigned long)page_address(page); - } else if (cpa->flags & CPA_ARRAY) - address = cpa->vaddr[cpa->curpage]; - else - address = *cpa->vaddr; -repeat: - kpte = lookup_address(address, &level); - if (!kpte) - return __cpa_process_fault(cpa, address, primary); - - old_pte = *kpte; - if (!pte_val(old_pte)) - return __cpa_process_fault(cpa, address, primary); - - if (level == PG_LEVEL_4K) { - pte_t new_pte; - pgprot_t new_prot = pte_pgprot(old_pte); - unsigned long pfn = pte_pfn(old_pte); - - pgprot_val(new_prot) &= ~pgprot_val(cpa->mask_clr); - pgprot_val(new_prot) |= pgprot_val(cpa->mask_set); - - new_prot = static_protections(new_prot, address, pfn); - - /* - * We need to keep the pfn from the existing PTE, - * after all we're only going to change it's attributes - * not the memory it points to - */ - new_pte = pfn_pte(pfn, canon_pgprot(new_prot)); - cpa->pfn = pfn; - /* - * Do we really change anything ? - */ - if (pte_val(old_pte) != pte_val(new_pte)) { - set_pte_atomic(kpte, new_pte); - cpa->flags |= CPA_FLUSHTLB; - } - cpa->numpages = 1; - return 0; - } - - /* - * Check, whether we can keep the large page intact - * and just change the pte: - */ - do_split = try_preserve_large_page(kpte, address, cpa); - /* - * When the range fits into the existing large page, - * return. cp->numpages and cpa->tlbflush have been updated in - * try_large_page: - */ - if (do_split <= 0) - return do_split; - - /* - * We have to split the large page: - */ - err = split_large_page(kpte, address); - if (!err) { - /* - * Do a global flush tlb after splitting the large page - * and before we do the actual change page attribute in the PTE. - * - * With out this, we violate the TLB application note, that says - * "The TLBs may contain both ordinary and large-page - * translations for a 4-KByte range of linear addresses. This - * may occur if software modifies the paging structures so that - * the page size used for the address range changes. If the two - * translations differ with respect to page frame or attributes - * (e.g., permissions), processor behavior is undefined and may - * be implementation-specific." - * - * We do this global tlb flush inside the cpa_lock, so that we - * don't allow any other cpu, with stale tlb entries change the - * page attribute in parallel, that also falls into the - * just split large page entry. - */ - flush_tlb_all(); - goto repeat; - } - - return err; -} - -static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias); - -static int cpa_process_alias(struct cpa_data *cpa) -{ - struct cpa_data alias_cpa; - unsigned long laddr = (unsigned long)__va(cpa->pfn << PAGE_SHIFT); - unsigned long vaddr; - int ret; - - if (cpa->pfn >= max_pfn_mapped) - return 0; - -#ifdef CONFIG_X86_64 - if (cpa->pfn >= max_low_pfn_mapped && cpa->pfn < (1UL<<(32-PAGE_SHIFT))) - return 0; -#endif - /* - * No need to redo, when the primary call touched the direct - * mapping already: - */ - if (cpa->flags & CPA_PAGES_ARRAY) { - struct page *page = cpa->pages[cpa->curpage]; - if (unlikely(PageHighMem(page))) - return 0; - vaddr = (unsigned long)page_address(page); - } else if (cpa->flags & CPA_ARRAY) - vaddr = cpa->vaddr[cpa->curpage]; - else - vaddr = *cpa->vaddr; - - if (!(within(vaddr, PAGE_OFFSET, - PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT)))) { - - alias_cpa = *cpa; - alias_cpa.vaddr = &laddr; - alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); - - ret = __change_page_attr_set_clr(&alias_cpa, 0); - if (ret) - return ret; - } - -#ifdef CONFIG_X86_64 - /* - * If the primary call didn't touch the high mapping already - * and the physical address is inside the kernel map, we need - * to touch the high mapped kernel as well: - */ - if (!within(vaddr, (unsigned long)_text, _brk_end) && - within(cpa->pfn, highmap_start_pfn(), highmap_end_pfn())) { - unsigned long temp_cpa_vaddr = (cpa->pfn << PAGE_SHIFT) + - __START_KERNEL_map - phys_base; - alias_cpa = *cpa; - alias_cpa.vaddr = &temp_cpa_vaddr; - alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY); - - /* - * The high mapping range is imprecise, so ignore the - * return value. - */ - __change_page_attr_set_clr(&alias_cpa, 0); - } -#endif - - return 0; -} - -static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias) -{ - int ret, numpages = cpa->numpages; - - while (numpages) { - /* - * Store the remaining nr of pages for the large page - * preservation check. - */ - cpa->numpages = numpages; - /* for array changes, we can't use large page */ - if (cpa->flags & (CPA_ARRAY | CPA_PAGES_ARRAY)) - cpa->numpages = 1; - - if (!debug_pagealloc) - spin_lock(&cpa_lock); - ret = __change_page_attr(cpa, checkalias); - if (!debug_pagealloc) - spin_unlock(&cpa_lock); - if (ret) - return ret; - - if (checkalias) { - ret = cpa_process_alias(cpa); - if (ret) - return ret; - } - - /* - * Adjust the number of pages with the result of the - * CPA operation. Either a large page has been - * preserved or a single page update happened. - */ - BUG_ON(cpa->numpages > numpages); - numpages -= cpa->numpages; - if (cpa->flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) - cpa->curpage++; - else - *cpa->vaddr += cpa->numpages * PAGE_SIZE; - - } - return 0; -} - -static inline int cache_attr(pgprot_t attr) -{ - return pgprot_val(attr) & - (_PAGE_PAT | _PAGE_PAT_LARGE | _PAGE_PWT | _PAGE_PCD); -} - -static int change_page_attr_set_clr(unsigned long *addr, int numpages, - pgprot_t mask_set, pgprot_t mask_clr, - int force_split, int in_flag, - struct page **pages) -{ - struct cpa_data cpa; - int ret, cache, checkalias; - unsigned long baddr = 0; - - /* - * Check, if we are requested to change a not supported - * feature: - */ - mask_set = canon_pgprot(mask_set); - mask_clr = canon_pgprot(mask_clr); - if (!pgprot_val(mask_set) && !pgprot_val(mask_clr) && !force_split) - return 0; - - /* Ensure we are PAGE_SIZE aligned */ - if (in_flag & CPA_ARRAY) { - int i; - for (i = 0; i < numpages; i++) { - if (addr[i] & ~PAGE_MASK) { - addr[i] &= PAGE_MASK; - WARN_ON_ONCE(1); - } - } - } else if (!(in_flag & CPA_PAGES_ARRAY)) { - /* - * in_flag of CPA_PAGES_ARRAY implies it is aligned. - * No need to cehck in that case - */ - if (*addr & ~PAGE_MASK) { - *addr &= PAGE_MASK; - /* - * People should not be passing in unaligned addresses: - */ - WARN_ON_ONCE(1); - } - /* - * Save address for cache flush. *addr is modified in the call - * to __change_page_attr_set_clr() below. - */ - baddr = *addr; - } - - /* Must avoid aliasing mappings in the highmem code */ - kmap_flush_unused(); - - vm_unmap_aliases(); - - cpa.vaddr = addr; - cpa.pages = pages; - cpa.numpages = numpages; - cpa.mask_set = mask_set; - cpa.mask_clr = mask_clr; - cpa.flags = 0; - cpa.curpage = 0; - cpa.force_split = force_split; - - if (in_flag & (CPA_ARRAY | CPA_PAGES_ARRAY)) - cpa.flags |= in_flag; - - /* No alias checking for _NX bit modifications */ - checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX; - - ret = __change_page_attr_set_clr(&cpa, checkalias); - - /* - * Check whether we really changed something: - */ - if (!(cpa.flags & CPA_FLUSHTLB)) - goto out; - - /* - * No need to flush, when we did not set any of the caching - * attributes: - */ - cache = cache_attr(mask_set); - - /* - * On success we use clflush, when the CPU supports it to - * avoid the wbindv. If the CPU does not support it and in the - * error case we fall back to cpa_flush_all (which uses - * wbindv): - */ - if (!ret && cpu_has_clflush) { - if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) { - cpa_flush_array(addr, numpages, cache, - cpa.flags, pages); - } else - cpa_flush_range(baddr, numpages, cache); - } else - cpa_flush_all(cache); - -out: - return ret; -} - -static inline int change_page_attr_set(unsigned long *addr, int numpages, - pgprot_t mask, int array) -{ - return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0), 0, - (array ? CPA_ARRAY : 0), NULL); -} - -static inline int change_page_attr_clear(unsigned long *addr, int numpages, - pgprot_t mask, int array) -{ - return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask, 0, - (array ? CPA_ARRAY : 0), NULL); -} - -static inline int cpa_set_pages_array(struct page **pages, int numpages, - pgprot_t mask) -{ - return change_page_attr_set_clr(NULL, numpages, mask, __pgprot(0), 0, - CPA_PAGES_ARRAY, pages); -} - -static inline int cpa_clear_pages_array(struct page **pages, int numpages, - pgprot_t mask) -{ - return change_page_attr_set_clr(NULL, numpages, __pgprot(0), mask, 0, - CPA_PAGES_ARRAY, pages); -} - -int _set_memory_uc(unsigned long addr, int numpages) -{ - /* - * for now UC MINUS. see comments in ioremap_nocache() - */ - return change_page_attr_set(&addr, numpages, - __pgprot(_PAGE_CACHE_UC_MINUS), 0); -} - -int set_memory_uc(unsigned long addr, int numpages) -{ - int ret; - - /* - * for now UC MINUS. see comments in ioremap_nocache() - */ - ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE, - _PAGE_CACHE_UC_MINUS, NULL); - if (ret) - goto out_err; - - ret = _set_memory_uc(addr, numpages); - if (ret) - goto out_free; - - return 0; - -out_free: - free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE); -out_err: - return ret; -} -EXPORT_SYMBOL(set_memory_uc); - -static int _set_memory_array(unsigned long *addr, int addrinarray, - unsigned long new_type) -{ - int i, j; - int ret; - - /* - * for now UC MINUS. see comments in ioremap_nocache() - */ - for (i = 0; i < addrinarray; i++) { - ret = reserve_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE, - new_type, NULL); - if (ret) - goto out_free; - } - - ret = change_page_attr_set(addr, addrinarray, - __pgprot(_PAGE_CACHE_UC_MINUS), 1); - - if (!ret && new_type == _PAGE_CACHE_WC) - ret = change_page_attr_set_clr(addr, addrinarray, - __pgprot(_PAGE_CACHE_WC), - __pgprot(_PAGE_CACHE_MASK), - 0, CPA_ARRAY, NULL); - if (ret) - goto out_free; - - return 0; - -out_free: - for (j = 0; j < i; j++) - free_memtype(__pa(addr[j]), __pa(addr[j]) + PAGE_SIZE); - - return ret; -} - -int set_memory_array_uc(unsigned long *addr, int addrinarray) -{ - return _set_memory_array(addr, addrinarray, _PAGE_CACHE_UC_MINUS); -} -EXPORT_SYMBOL(set_memory_array_uc); - -int set_memory_array_wc(unsigned long *addr, int addrinarray) -{ - return _set_memory_array(addr, addrinarray, _PAGE_CACHE_WC); -} -EXPORT_SYMBOL(set_memory_array_wc); - -int _set_memory_wc(unsigned long addr, int numpages) -{ - int ret; - unsigned long addr_copy = addr; - - ret = change_page_attr_set(&addr, numpages, - __pgprot(_PAGE_CACHE_UC_MINUS), 0); - if (!ret) { - ret = change_page_attr_set_clr(&addr_copy, numpages, - __pgprot(_PAGE_CACHE_WC), - __pgprot(_PAGE_CACHE_MASK), - 0, 0, NULL); - } - return ret; -} - -int set_memory_wc(unsigned long addr, int numpages) -{ - int ret; - - if (!pat_enabled) - return set_memory_uc(addr, numpages); - - ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE, - _PAGE_CACHE_WC, NULL); - if (ret) - goto out_err; - - ret = _set_memory_wc(addr, numpages); - if (ret) - goto out_free; - - return 0; - -out_free: - free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE); -out_err: - return ret; -} -EXPORT_SYMBOL(set_memory_wc); - -int _set_memory_wb(unsigned long addr, int numpages) -{ - return change_page_attr_clear(&addr, numpages, - __pgprot(_PAGE_CACHE_MASK), 0); -} - -int set_memory_wb(unsigned long addr, int numpages) -{ - int ret; - - ret = _set_memory_wb(addr, numpages); - if (ret) - return ret; - - free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE); - return 0; -} -EXPORT_SYMBOL(set_memory_wb); - -int set_memory_array_wb(unsigned long *addr, int addrinarray) -{ - int i; - int ret; - - ret = change_page_attr_clear(addr, addrinarray, - __pgprot(_PAGE_CACHE_MASK), 1); - if (ret) - return ret; - - for (i = 0; i < addrinarray; i++) - free_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE); - - return 0; -} -EXPORT_SYMBOL(set_memory_array_wb); - -int set_memory_x(unsigned long addr, int numpages) -{ - if (!(__supported_pte_mask & _PAGE_NX)) - return 0; - - return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_NX), 0); -} -EXPORT_SYMBOL(set_memory_x); - -int set_memory_nx(unsigned long addr, int numpages) -{ - if (!(__supported_pte_mask & _PAGE_NX)) - return 0; - - return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_NX), 0); -} -EXPORT_SYMBOL(set_memory_nx); - -int set_memory_ro(unsigned long addr, int numpages) -{ - return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_RW), 0); -} -EXPORT_SYMBOL_GPL(set_memory_ro); - -int set_memory_rw(unsigned long addr, int numpages) -{ - return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_RW), 0); -} -EXPORT_SYMBOL_GPL(set_memory_rw); - -int set_memory_np(unsigned long addr, int numpages) -{ - return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_PRESENT), 0); -} - -int set_memory_4k(unsigned long addr, int numpages) -{ - return change_page_attr_set_clr(&addr, numpages, __pgprot(0), - __pgprot(0), 1, 0, NULL); -} - -int set_pages_uc(struct page *page, int numpages) -{ - unsigned long addr = (unsigned long)page_address(page); - - return set_memory_uc(addr, numpages); -} -EXPORT_SYMBOL(set_pages_uc); - -static int _set_pages_array(struct page **pages, int addrinarray, - unsigned long new_type) -{ - unsigned long start; - unsigned long end; - int i; - int free_idx; - int ret; - - for (i = 0; i < addrinarray; i++) { - if (PageHighMem(pages[i])) - continue; - start = page_to_pfn(pages[i]) << PAGE_SHIFT; - end = start + PAGE_SIZE; - if (reserve_memtype(start, end, new_type, NULL)) - goto err_out; - } - - ret = cpa_set_pages_array(pages, addrinarray, - __pgprot(_PAGE_CACHE_UC_MINUS)); - if (!ret && new_type == _PAGE_CACHE_WC) - ret = change_page_attr_set_clr(NULL, addrinarray, - __pgprot(_PAGE_CACHE_WC), - __pgprot(_PAGE_CACHE_MASK), - 0, CPA_PAGES_ARRAY, pages); - if (ret) - goto err_out; - return 0; /* Success */ -err_out: - free_idx = i; - for (i = 0; i < free_idx; i++) { - if (PageHighMem(pages[i])) - continue; - start = page_to_pfn(pages[i]) << PAGE_SHIFT; - end = start + PAGE_SIZE; - free_memtype(start, end); - } - return -EINVAL; -} - -int set_pages_array_uc(struct page **pages, int addrinarray) -{ - return _set_pages_array(pages, addrinarray, _PAGE_CACHE_UC_MINUS); -} -EXPORT_SYMBOL(set_pages_array_uc); - -int set_pages_array_wc(struct page **pages, int addrinarray) -{ - return _set_pages_array(pages, addrinarray, _PAGE_CACHE_WC); -} -EXPORT_SYMBOL(set_pages_array_wc); - -int set_pages_wb(struct page *page, int numpages) -{ - unsigned long addr = (unsigned long)page_address(page); - - return set_memory_wb(addr, numpages); -} -EXPORT_SYMBOL(set_pages_wb); - -int set_pages_array_wb(struct page **pages, int addrinarray) -{ - int retval; - unsigned long start; - unsigned long end; - int i; - - retval = cpa_clear_pages_array(pages, addrinarray, - __pgprot(_PAGE_CACHE_MASK)); - if (retval) - return retval; - - for (i = 0; i < addrinarray; i++) { - if (PageHighMem(pages[i])) - continue; - start = page_to_pfn(pages[i]) << PAGE_SHIFT; - end = start + PAGE_SIZE; - free_memtype(start, end); - } - - return 0; -} -EXPORT_SYMBOL(set_pages_array_wb); - -int set_pages_x(struct page *page, int numpages) -{ - unsigned long addr = (unsigned long)page_address(page); - - return set_memory_x(addr, numpages); -} -EXPORT_SYMBOL(set_pages_x); - -int set_pages_nx(struct page *page, int numpages) -{ - unsigned long addr = (unsigned long)page_address(page); - - return set_memory_nx(addr, numpages); -} -EXPORT_SYMBOL(set_pages_nx); - -int set_pages_ro(struct page *page, int numpages) -{ - unsigned long addr = (unsigned long)page_address(page); - - return set_memory_ro(addr, numpages); -} - -int set_pages_rw(struct page *page, int numpages) -{ - unsigned long addr = (unsigned long)page_address(page); - - return set_memory_rw(addr, numpages); -} - -#ifdef CONFIG_DEBUG_PAGEALLOC - -static int __set_pages_p(struct page *page, int numpages) -{ - unsigned long tempaddr = (unsigned long) page_address(page); - struct cpa_data cpa = { .vaddr = &tempaddr, - .numpages = numpages, - .mask_set = __pgprot(_PAGE_PRESENT | _PAGE_RW), - .mask_clr = __pgprot(0), - .flags = 0}; - - /* - * No alias checking needed for setting present flag. otherwise, - * we may need to break large pages for 64-bit kernel text - * mappings (this adds to complexity if we want to do this from - * atomic context especially). Let's keep it simple! - */ - return __change_page_attr_set_clr(&cpa, 0); -} - -static int __set_pages_np(struct page *page, int numpages) -{ - unsigned long tempaddr = (unsigned long) page_address(page); - struct cpa_data cpa = { .vaddr = &tempaddr, - .numpages = numpages, - .mask_set = __pgprot(0), - .mask_clr = __pgprot(_PAGE_PRESENT | _PAGE_RW), - .flags = 0}; - - /* - * No alias checking needed for setting not present flag. otherwise, - * we may need to break large pages for 64-bit kernel text - * mappings (this adds to complexity if we want to do this from - * atomic context especially). Let's keep it simple! - */ - return __change_page_attr_set_clr(&cpa, 0); -} - -void kernel_map_pages(struct page *page, int numpages, int enable) -{ - if (PageHighMem(page)) - return; - if (!enable) { - debug_check_no_locks_freed(page_address(page), - numpages * PAGE_SIZE); - } - - /* - * The return value is ignored as the calls cannot fail. - * Large pages for identity mappings are not used at boot time - * and hence no memory allocations during large page split. - */ - if (enable) - __set_pages_p(page, numpages); - else - __set_pages_np(page, numpages); - - /* - * We should perform an IPI and flush all tlbs, - * but that can deadlock->flush only current cpu: - */ - __flush_tlb_all(); -} - -#ifdef CONFIG_HIBERNATION - -bool kernel_page_present(struct page *page) -{ - unsigned int level; - pte_t *pte; - - if (PageHighMem(page)) - return false; - - pte = lookup_address((unsigned long)page_address(page), &level); - return (pte_val(*pte) & _PAGE_PRESENT); -} - -#endif /* CONFIG_HIBERNATION */ - -#endif /* CONFIG_DEBUG_PAGEALLOC */ - -/* - * The testcases use internal knowledge of the implementation that shouldn't - * be exposed to the rest of the kernel. Include these directly here. - */ -#ifdef CONFIG_CPA_DEBUG -#include "pageattr-test.c" -#endif |