From patchwork Sat Jun 1 07:49:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10971281 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5FEBF912 for ; Sat, 1 Jun 2019 07:51:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 559ED28D23 for ; Sat, 1 Jun 2019 07:51:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4A43628D60; Sat, 1 Jun 2019 07:51:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 82C3328D23 for ; Sat, 1 Jun 2019 07:51:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727404AbfFAHvw (ORCPT ); Sat, 1 Jun 2019 03:51:52 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:50940 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726762AbfFAHuq (ORCPT ); Sat, 1 Jun 2019 03:50:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=+LfGuMfatgroW0jiS20tFtJAd2NqewOpaHqEsGODANw=; b=eE95xrUuL7kkWCoaKsPoZHTM9n +uxefZJsMtpZR1dFkKdXmQKn71jPBFPhryCZxeOMCReSl1SkXiBbeQfC99eqGQ9Nx+raeaYaiw6n7 kqWM40DTdSnKN32Nmdn7CTY2if9XVpPCItOuq2/D7TE4owWq07UOF9yscCDGHwytHCkG8uDjRAGl3 nwuB8VW67ddYUkfmxeCXya2Y10eAyw2t62Yc+o+RZVoLZ+c1O+rnqiNAah+pGVEMXzZkTAn13QfZ3 1lY/YHrew2+EfnQjeX66nfzOo4JtunYnFjJwVaie6Faw2NbhHxeslChO5UPWV3S5UZSkUOJ49R6Xz u/lXEeog==; Received: from 217-76-161-89.static.highway.a1.net ([217.76.161.89] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWymb-0007mg-Hb; Sat, 01 Jun 2019 07:50:30 +0000 From: Christoph Hellwig To: Linus Torvalds , Paul Burton , James Hogan , Yoshinori Sato , Rich Felker , "David S. Miller" Cc: Nicholas Piggin , Khalid Aziz , Andrey Konovalov , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , linux-mips@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 07/16] sh: use the generic get_user_pages_fast code Date: Sat, 1 Jun 2019 09:49:50 +0200 Message-Id: <20190601074959.14036-8-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190601074959.14036-1-hch@lst.de> References: <20190601074959.14036-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The sh code is mostly equivalent to the generic one, minus various bugfixes and two arch overrides that this patch adds to pgtable.h. Signed-off-by: Christoph Hellwig --- arch/sh/Kconfig | 2 + arch/sh/include/asm/pgtable.h | 37 +++++ arch/sh/mm/Makefile | 2 +- arch/sh/mm/gup.c | 277 ---------------------------------- 4 files changed, 40 insertions(+), 278 deletions(-) delete mode 100644 arch/sh/mm/gup.c diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index b77f512bb176..6fddfc3c9710 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -14,6 +14,7 @@ config SUPERH select HAVE_ARCH_TRACEHOOK select HAVE_PERF_EVENTS select HAVE_DEBUG_BUGVERBOSE + select HAVE_GENERIC_GUP select ARCH_HAVE_CUSTOM_GPIO_H select ARCH_HAVE_NMI_SAFE_CMPXCHG if (GUSA_RB || CPU_SH4A) select ARCH_HAS_GCOV_PROFILE_ALL @@ -63,6 +64,7 @@ config SUPERH config SUPERH32 def_bool "$(ARCH)" = "sh" select ARCH_32BIT_OFF_T + select GUP_GET_PTE_LOW_HIGH if X2TLB select HAVE_KPROBES select HAVE_KRETPROBES select HAVE_IOREMAP_PROT if MMU && !X2TLB diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h index 3587103afe59..9085d1142fa3 100644 --- a/arch/sh/include/asm/pgtable.h +++ b/arch/sh/include/asm/pgtable.h @@ -149,6 +149,43 @@ extern void paging_init(void); extern void page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd); +static inline bool __pte_access_permitted(pte_t pte, u64 prot) +{ + return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot; +} + +#ifdef CONFIG_X2TLB +static inline bool pte_access_permitted(pte_t pte, bool write) +{ + u64 prot = _PAGE_PRESENT; + + prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ); + if (write) + prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE); + return __pte_access_permitted(pte, prot); +} +#elif defined(CONFIG_SUPERH64) +static inline bool pte_access_permitted(pte_t pte, bool write) +{ + u64 prot = _PAGE_PRESENT | _PAGE_USER | _PAGE_READ; + + if (write) + prot |= _PAGE_WRITE; + return __pte_access_permitted(pte, prot); +} +#else +static inline bool pte_access_permitted(pte_t pte, bool write) +{ + u64 prot = _PAGE_PRESENT | _PAGE_USER; + + if (write) + prot |= _PAGE_RW; + return __pte_access_permitted(pte, prot); +} +#endif + +#define pte_access_permitted pte_access_permitted + /* arch/sh/mm/mmap.c */ #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile index fbe5e79751b3..5051b38fd5b6 100644 --- a/arch/sh/mm/Makefile +++ b/arch/sh/mm/Makefile @@ -17,7 +17,7 @@ cacheops-$(CONFIG_CPU_SHX3) += cache-shx3.o obj-y += $(cacheops-y) mmu-y := nommu.o extable_32.o -mmu-$(CONFIG_MMU) := extable_$(BITS).o fault.o gup.o ioremap.o kmap.o \ +mmu-$(CONFIG_MMU) := extable_$(BITS).o fault.o ioremap.o kmap.o \ pgtable.o tlbex_$(BITS).o tlbflush_$(BITS).o obj-y += $(mmu-y) diff --git a/arch/sh/mm/gup.c b/arch/sh/mm/gup.c deleted file mode 100644 index 277c882f7489..000000000000 --- a/arch/sh/mm/gup.c +++ /dev/null @@ -1,277 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Lockless get_user_pages_fast for SuperH - * - * Copyright (C) 2009 - 2010 Paul Mundt - * - * Cloned from the x86 and PowerPC versions, by: - * - * Copyright (C) 2008 Nick Piggin - * Copyright (C) 2008 Novell Inc. - */ -#include -#include -#include -#include -#include - -static inline pte_t gup_get_pte(pte_t *ptep) -{ -#ifndef CONFIG_X2TLB - return READ_ONCE(*ptep); -#else - /* - * With get_user_pages_fast, we walk down the pagetables without - * taking any locks. For this we would like to load the pointers - * atomically, but that is not possible with 64-bit PTEs. What - * we do have is the guarantee that a pte will only either go - * from not present to present, or present to not present or both - * -- it will not switch to a completely different present page - * without a TLB flush in between; something that we are blocking - * by holding interrupts off. - * - * Setting ptes from not present to present goes: - * ptep->pte_high = h; - * smp_wmb(); - * ptep->pte_low = l; - * - * And present to not present goes: - * ptep->pte_low = 0; - * smp_wmb(); - * ptep->pte_high = 0; - * - * We must ensure here that the load of pte_low sees l iff pte_high - * sees h. We load pte_high *after* loading pte_low, which ensures we - * don't see an older value of pte_high. *Then* we recheck pte_low, - * which ensures that we haven't picked up a changed pte high. We might - * have got rubbish values from pte_low and pte_high, but we are - * guaranteed that pte_low will not have the present bit set *unless* - * it is 'l'. And get_user_pages_fast only operates on present ptes, so - * we're safe. - * - * gup_get_pte should not be used or copied outside gup.c without being - * very careful -- it does not atomically load the pte or anything that - * is likely to be useful for you. - */ - pte_t pte; - -retry: - pte.pte_low = ptep->pte_low; - smp_rmb(); - pte.pte_high = ptep->pte_high; - smp_rmb(); - if (unlikely(pte.pte_low != ptep->pte_low)) - goto retry; - - return pte; -#endif -} - -/* - * The performance critical leaf functions are made noinline otherwise gcc - * inlines everything into a single function which results in too much - * register pressure. - */ -static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, - unsigned long end, int write, struct page **pages, int *nr) -{ - u64 mask, result; - pte_t *ptep; - -#ifdef CONFIG_X2TLB - result = _PAGE_PRESENT | _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ); - if (write) - result |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE); -#elif defined(CONFIG_SUPERH64) - result = _PAGE_PRESENT | _PAGE_USER | _PAGE_READ; - if (write) - result |= _PAGE_WRITE; -#else - result = _PAGE_PRESENT | _PAGE_USER; - if (write) - result |= _PAGE_RW; -#endif - - mask = result | _PAGE_SPECIAL; - - ptep = pte_offset_map(&pmd, addr); - do { - pte_t pte = gup_get_pte(ptep); - struct page *page; - - if ((pte_val(pte) & mask) != result) { - pte_unmap(ptep); - return 0; - } - VM_BUG_ON(!pfn_valid(pte_pfn(pte))); - page = pte_page(pte); - get_page(page); - __flush_anon_page(page, addr); - flush_dcache_page(page); - pages[*nr] = page; - (*nr)++; - - } while (ptep++, addr += PAGE_SIZE, addr != end); - pte_unmap(ptep - 1); - - return 1; -} - -static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) -{ - unsigned long next; - pmd_t *pmdp; - - pmdp = pmd_offset(&pud, addr); - do { - pmd_t pmd = *pmdp; - - next = pmd_addr_end(addr, end); - if (pmd_none(pmd)) - return 0; - if (!gup_pte_range(pmd, addr, next, write, pages, nr)) - return 0; - } while (pmdp++, addr = next, addr != end); - - return 1; -} - -static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) -{ - unsigned long next; - pud_t *pudp; - - pudp = pud_offset(&pgd, addr); - do { - pud_t pud = *pudp; - - next = pud_addr_end(addr, end); - if (pud_none(pud)) - return 0; - if (!gup_pmd_range(pud, addr, next, write, pages, nr)) - return 0; - } while (pudp++, addr = next, addr != end); - - return 1; -} - -/* - * Like get_user_pages_fast() except its IRQ-safe in that it won't fall - * back to the regular GUP. - * Note a difference with get_user_pages_fast: this always returns the - * number of pages pinned, 0 if no pages were pinned. - */ -int __get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages) -{ - struct mm_struct *mm = current->mm; - unsigned long addr, len, end; - unsigned long next; - unsigned long flags; - pgd_t *pgdp; - int nr = 0; - - start &= PAGE_MASK; - addr = start; - len = (unsigned long) nr_pages << PAGE_SHIFT; - end = start + len; - if (unlikely(!access_ok((void __user *)start, len))) - return 0; - - /* - * This doesn't prevent pagetable teardown, but does prevent - * the pagetables and pages from being freed. - */ - local_irq_save(flags); - pgdp = pgd_offset(mm, addr); - do { - pgd_t pgd = *pgdp; - - next = pgd_addr_end(addr, end); - if (pgd_none(pgd)) - break; - if (!gup_pud_range(pgd, addr, next, write, pages, &nr)) - break; - } while (pgdp++, addr = next, addr != end); - local_irq_restore(flags); - - return nr; -} - -/** - * get_user_pages_fast() - pin user pages in memory - * @start: starting user address - * @nr_pages: number of pages from start to pin - * @gup_flags: flags modifying pin behaviour - * @pages: array that receives pointers to the pages pinned. - * Should be at least nr_pages long. - * - * Attempt to pin user pages in memory without taking mm->mmap_sem. - * If not successful, it will fall back to taking the lock and - * calling get_user_pages(). - * - * Returns number of pages pinned. This may be fewer than the number - * requested. If nr_pages is 0 or negative, returns 0. If no pages - * were pinned, returns -errno. - */ -int get_user_pages_fast(unsigned long start, int nr_pages, - unsigned int gup_flags, struct page **pages) -{ - struct mm_struct *mm = current->mm; - unsigned long addr, len, end; - unsigned long next; - pgd_t *pgdp; - int nr = 0; - - start &= PAGE_MASK; - addr = start; - len = (unsigned long) nr_pages << PAGE_SHIFT; - - end = start + len; - if (end < start) - goto slow_irqon; - - local_irq_disable(); - pgdp = pgd_offset(mm, addr); - do { - pgd_t pgd = *pgdp; - - next = pgd_addr_end(addr, end); - if (pgd_none(pgd)) - goto slow; - if (!gup_pud_range(pgd, addr, next, gup_flags & FOLL_WRITE, - pages, &nr)) - goto slow; - } while (pgdp++, addr = next, addr != end); - local_irq_enable(); - - VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT); - return nr; - - { - int ret; - -slow: - local_irq_enable(); -slow_irqon: - /* Try to get the remaining pages with get_user_pages */ - start += nr << PAGE_SHIFT; - pages += nr; - - ret = get_user_pages_unlocked(start, - (end - start) >> PAGE_SHIFT, pages, - gup_flags); - - /* Have to be a bit careful with return values */ - if (nr > 0) { - if (ret < 0) - ret = nr; - else - ret += nr; - } - - return ret; - } -}