From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,URIBL_DBL_ABUSE_MALW autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BEBC8C33CB2 for ; Fri, 31 Jan 2020 12:56:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 924F620705 for ; Fri, 31 Jan 2020 12:56:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PiXr0TMK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728514AbgAaM4F (ORCPT ); Fri, 31 Jan 2020 07:56:05 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:53356 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728511AbgAaM4F (ORCPT ); Fri, 31 Jan 2020 07:56:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-Id:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=n6RhCQHsHSyTTjZawIUQRIGp0UsjTpUD7uRgGAuTt9A=; b=PiXr0TMKBYgO1KuaqgBFJjOPAJ jsw+p5rUo36Dm+/CFm2tZ4siWZ254oxNJxdEqOfpzB4jEH/UhKKmw0fuf9KV261tj7yFZ+3lsVPVZ r2ysWQwFFvo34sOzbTY3Op04SYS2dFAvyn5OkjQdxK0dwPv8aRd2UthCr8rF0amWRlUIv7dLeb8wV QqmyHqNODbxGQujpXWQO6LDfdtSaRghDzFvdfBxXF+OQPSDOuvLuDmk1WIp1PS8hWCmY+DHPUXqLr Ql1j4CrA5ofiQim4yVy47OunCuO0gTkQOlSP0lfWkEHB5h7l7ZoLY8k98mkbPphB0WJNqvy6oAG0A JxRLjLKA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1ixVq7-0001ZA-2D; Fri, 31 Jan 2020 12:56:03 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 3C2B43011E8; Fri, 31 Jan 2020 13:54:17 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id E25142B4C4271; Fri, 31 Jan 2020 13:56:00 +0100 (CET) Message-Id: <20200131125403.597688427@infradead.org> User-Agent: quilt/0.65 Date: Fri, 31 Jan 2020 13:45:34 +0100 From: Peter Zijlstra To: Geert Uytterhoeven Cc: linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org, Will Deacon , Peter Zijlstra , Michael Schmitz , Greg Ungerer Subject: [PATCH -v2 03/10] m68k,mm: Unify Motorola MMU page setup References: <20200131124531.623136425@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-m68k-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Seeing how there are 5 copies of this magic code, one of which is unexplainably different, unify and document things. Suggested-by: Will Deacon Signed-off-by: Peter Zijlstra (Intel) --- arch/m68k/include/asm/motorola_pgalloc.h | 23 ++++++++++------------- arch/m68k/mm/memory.c | 5 ++--- arch/m68k/mm/motorola.c | 30 ++++++++++++++++++++++++------ 3 files changed, 36 insertions(+), 22 deletions(-) --- a/arch/m68k/include/asm/motorola_pgalloc.h +++ b/arch/m68k/include/asm/motorola_pgalloc.h @@ -5,6 +5,9 @@ #include #include +extern void mmu_page_ctor(void *page); +extern void mmu_page_dtor(void *page); + extern pmd_t *get_pointer_table(void); extern int free_pointer_table(pmd_t *); @@ -13,25 +16,21 @@ static inline pte_t *pte_alloc_one_kerne pte_t *pte; pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO); - if (pte) { - __flush_page_to_ram(pte); - flush_tlb_kernel_page(pte); - nocache_page(pte); - } + if (pte) + mmu_page_ctor(pte); return pte; } static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { - cache_page(pte); + mmu_page_dtor(pte); free_page((unsigned long) pte); } static inline pgtable_t pte_alloc_one(struct mm_struct *mm) { struct page *page; - pte_t *pte; page = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0); if(!page) @@ -41,18 +40,16 @@ static inline pgtable_t pte_alloc_one(st return NULL; } - pte = kmap(page); - __flush_page_to_ram(pte); - flush_tlb_kernel_page(pte); - nocache_page(pte); + mmu_page_ctor(kmap(page)); kunmap(page); + return page; } static inline void pte_free(struct mm_struct *mm, pgtable_t page) { pgtable_pte_page_dtor(page); - cache_page(kmap(page)); + mmu_page_dtor(kmap(page)); kunmap(page); __free_page(page); } @@ -61,7 +58,7 @@ static inline void __pte_free_tlb(struct unsigned long address) { pgtable_pte_page_dtor(page); - cache_page(kmap(page)); + mmu_page_dtor(kmap(page)); kunmap(page); __free_page(page); } --- a/arch/m68k/mm/memory.c +++ b/arch/m68k/mm/memory.c @@ -77,8 +77,7 @@ pmd_t *get_pointer_table (void) if (!(page = (void *)get_zeroed_page(GFP_KERNEL))) return NULL; - flush_tlb_kernel_page(page); - nocache_page(page); + mmu_page_ctor(page); new = PD_PTABLE(page); PD_MARKBITS(new) = 0xfe; @@ -112,7 +111,7 @@ int free_pointer_table (pmd_t *ptable) if (PD_MARKBITS(dp) == 0xff) { /* all tables in page are free, free page */ list_del(dp); - cache_page((void *)page); + mmu_page_dtor((void *)page); free_page (page); return 1; } else if (ptable_list.next != dp) { --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -45,6 +45,28 @@ unsigned long mm_cachebits; EXPORT_SYMBOL(mm_cachebits); #endif + +/* + * Motorola 680x0 user's manual recommends using uncached memory for address + * translation tables. + * + * Seeing how the MMU can be external on (some of) these chips, that seems like + * a very important recommendation to follow. Provide some helpers to combat + * 'variation' amongst the users of this. + */ + +void mmu_page_ctor(void *page) +{ + __flush_page_to_ram(page); + flush_tlb_kernel_page(page); + nocache_page(page); +} + +void mmu_page_dtor(void *page) +{ + cache_page(page); +} + /* size of memory already mapped in head.S */ extern __initdata unsigned long m68k_init_mapped_size; @@ -60,9 +82,7 @@ static pte_t * __init kernel_page_table( __func__, PAGE_SIZE, PAGE_SIZE); clear_page(ptablep); - __flush_page_to_ram(ptablep); - flush_tlb_kernel_page(ptablep); - nocache_page(ptablep); + mmu_page_ctor(ptablep); return ptablep; } @@ -106,9 +126,7 @@ static pmd_t * __init kernel_ptr_table(v __func__, PAGE_SIZE, PAGE_SIZE); clear_page(last_pgtable); - __flush_page_to_ram(last_pgtable); - flush_tlb_kernel_page(last_pgtable); - nocache_page(last_pgtable); + mmu_page_ctor(last_pgtable); } return last_pgtable;