forked from luck/tmp_suning_uos_patched
e31cf2f4ca
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/lib/copypage-xscale.S
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*
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* Copyright (C) 1995-2005 Russell King
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*
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* This handles the mini data cache, as found on SA11x0 and XScale
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* processors. When we copy a user page page, we map it in such a way
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* that accesses to this page will not touch the main data cache, but
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* will be cached in the mini data cache. This prevents us thrashing
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* the main data cache on page faults.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include "mm.h"
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#define minicache_pgprot __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | \
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L_PTE_MT_MINICACHE)
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static DEFINE_RAW_SPINLOCK(minicache_lock);
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/*
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* XScale mini-dcache optimised copy_user_highpage
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*
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* We flush the destination cache lines just before we write the data into the
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* corresponding address. Since the Dcache is read-allocate, this removes the
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* Dcache aliasing issue. The writes will be forwarded to the write buffer,
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* and merged as appropriate.
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*/
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static void mc_copy_user_page(void *from, void *to)
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{
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int tmp;
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/*
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* Strangely enough, best performance is achieved
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* when prefetching destination as well. (NP)
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*/
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asm volatile ("\
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.arch xscale \n\
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pld [%0, #0] \n\
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pld [%0, #32] \n\
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pld [%1, #0] \n\
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pld [%1, #32] \n\
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1: pld [%0, #64] \n\
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pld [%0, #96] \n\
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pld [%1, #64] \n\
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pld [%1, #96] \n\
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2: ldrd r2, r3, [%0], #8 \n\
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ldrd r4, r5, [%0], #8 \n\
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mov ip, %1 \n\
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strd r2, r3, [%1], #8 \n\
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ldrd r2, r3, [%0], #8 \n\
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strd r4, r5, [%1], #8 \n\
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ldrd r4, r5, [%0], #8 \n\
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strd r2, r3, [%1], #8 \n\
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strd r4, r5, [%1], #8 \n\
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mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\
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ldrd r2, r3, [%0], #8 \n\
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mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\
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ldrd r4, r5, [%0], #8 \n\
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mov ip, %1 \n\
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strd r2, r3, [%1], #8 \n\
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ldrd r2, r3, [%0], #8 \n\
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strd r4, r5, [%1], #8 \n\
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ldrd r4, r5, [%0], #8 \n\
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strd r2, r3, [%1], #8 \n\
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strd r4, r5, [%1], #8 \n\
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mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\
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subs %2, %2, #1 \n\
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mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\
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bgt 1b \n\
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beq 2b "
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: "+&r" (from), "+&r" (to), "=&r" (tmp)
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: "2" (PAGE_SIZE / 64 - 1)
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: "r2", "r3", "r4", "r5", "ip");
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}
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void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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void *kto = kmap_atomic(to);
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if (!test_and_set_bit(PG_dcache_clean, &from->flags))
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__flush_dcache_page(page_mapping_file(from), from);
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raw_spin_lock(&minicache_lock);
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set_top_pte(COPYPAGE_MINICACHE, mk_pte(from, minicache_pgprot));
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mc_copy_user_page((void *)COPYPAGE_MINICACHE, kto);
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raw_spin_unlock(&minicache_lock);
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kunmap_atomic(kto);
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}
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/*
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* XScale optimised clear_user_page
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*/
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void
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xscale_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
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{
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void *ptr, *kaddr = kmap_atomic(page);
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asm volatile("\
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.arch xscale \n\
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mov r1, %2 \n\
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mov r2, #0 \n\
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mov r3, #0 \n\
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1: mov ip, %0 \n\
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strd r2, r3, [%0], #8 \n\
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strd r2, r3, [%0], #8 \n\
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strd r2, r3, [%0], #8 \n\
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strd r2, r3, [%0], #8 \n\
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mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\
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subs r1, r1, #1 \n\
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mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\
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bne 1b"
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: "=r" (ptr)
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: "0" (kaddr), "I" (PAGE_SIZE / 32)
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: "r1", "r2", "r3", "ip");
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kunmap_atomic(kaddr);
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}
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struct cpu_user_fns xscale_mc_user_fns __initdata = {
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.cpu_clear_user_highpage = xscale_mc_clear_user_highpage,
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.cpu_copy_user_highpage = xscale_mc_copy_user_highpage,
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};
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