From patchwork Thu Oct 29 22:18:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11867761 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D63581130 for ; Thu, 29 Oct 2020 22:32:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7172720791 for ; Thu, 29 Oct 2020 22:32:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="nQdMp28a"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="kUqRTEbU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7172720791 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 48DD86B0082; Thu, 29 Oct 2020 18:32:26 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 375986B0083; Thu, 29 Oct 2020 18:32:26 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1A5116B0085; Thu, 29 Oct 2020 18:32:26 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0029.hostedemail.com [216.40.44.29]) by kanga.kvack.org (Postfix) with ESMTP id D6B4C6B0082 for ; Thu, 29 Oct 2020 18:32:25 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 759873624 for ; Thu, 29 Oct 2020 22:32:25 +0000 (UTC) X-FDA: 77426413050.05.plot03_140d7a927291 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id 559611801611A for ; Thu, 29 Oct 2020 22:32:25 +0000 (UTC) X-Spam-Summary: 1,0,0,6bfc4b7f3ea48e49,d41d8cd98f00b204,tglx@linutronix.de,,RULES_HIT:2:41:69:152:355:379:800:960:973:988:989:1183:1260:1277:1311:1313:1314:1345:1431:1437:1515:1516:1518:1535:1593:1594:1605:1606:1730:1747:1777:1792:1978:1981:2194:2199:2307:2393:2553:2559:2562:2901:3138:3139:3140:3141:3142:3308:3865:3866:3867:3868:3870:3871:3872:3873:3874:4119:4250:4605:5007:6119:6261:6653:6742:6743:7875:7903:7904:9592:10004:11026:11232:11473:11657:11658:11914:12043:12160:12296:12297:12438:12683:14110:14659:21080:21433:21451:21611:21627:21810:21939:21972:21990:30003:30012:30054:30090,0,RBL:193.142.43.55:@linutronix.de:.lbl8.mailshell.net-62.2.6.100 64.100.201.201;04y8hg7hss7dpynigw9bucaesbn1wopdyjo3j7whf8jbrfk4imeu8bmt3uwttm7.n689d4muabzeg3dp5mftrqkukofhzhrrmmf1aozn6t3b134heac8a3j8efqsygc.n-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:70,LUA_SUMMARY:none X-HE-Tag: plot03_140d7a927291 X-Filterd-Recvd-Size: 8475 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf37.hostedemail.com (Postfix) with ESMTP for ; Thu, 29 Oct 2020 22:32:24 +0000 (UTC) Message-Id: <20201029222651.790791701@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1604010743; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=PJTgDGv1EffJTXrMYc/qet2rozVCckqqTczUm2p7QkU=; b=nQdMp28ar6VGNzDIj4XPmLBII+OX/rmncA8I2i7PtrqfapOORBCV9cDTdIVadbSKJGDqIr 3E3lzQICDs7WN+H1oWFYNS+9+6TRhHFida5q8gelWGc0iMYnr48c/O2kfGmsj0Sp92JZ7w 52/UmXYMik/eqdW1/uix5+lp3FXkMc3nglBYa2pAxbbIsQCA3Kl02zEgYm2IEcXXa7mw8+ Dn6vxV17oY5iAQrzBf4r6rvNIY5i+5PhMcf7q6Tnox/iS45+G7+6p4yCfQkuHPYhzAazf0 qSo2vMx/UNfMEx7wLhScAihBeO4P65u6udnGXmTTNY4yaDtVyUN3Q2tLXVnsgA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1604010743; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=PJTgDGv1EffJTXrMYc/qet2rozVCckqqTczUm2p7QkU=; b=kUqRTEbUyiLik2xVZgpWUuOyc5IpFxYB9mOTPPezew6l8ha+23s3Q3Ptzy1Z8AbgXIp6Id fnOSWlXpEN9DaEAg== Date: Thu, 29 Oct 2020 23:18:18 +0100 From: Thomas Gleixner To: LKML Cc: linux-arch@vger.kernel.org, Linus Torvalds , Peter Zijlstra , Paul McKenney , David Airlie , Daniel Vetter , Ard Biesheuvel , Herbert Xu , Christoph Hellwig , Sebastian Andrzej Siewior , "David S. Miller" , sparclinux@vger.kernel.org, Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Andrew Morton , linux-mm@kvack.org, x86@kernel.org, Vineet Gupta , linux-snps-arc@lists.infradead.org, Russell King , Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Guo Ren , linux-csky@vger.kernel.org, Michal Simek , Thomas Bogendoerfer , linux-mips@vger.kernel.org, Nick Hu , Greentime Hu , Vincent Chen , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org Subject: [patch V2 12/18] sparc/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@linutronix.de> MIME-Version: 1.0 Content-transfer-encoding: 8-bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: No reason having the same code in every architecture Signed-off-by: Thomas Gleixner Cc: "David S. Miller" Cc: sparclinux@vger.kernel.org --- arch/sparc/Kconfig | 1 arch/sparc/include/asm/highmem.h | 7 +- arch/sparc/mm/Makefile | 3 - arch/sparc/mm/highmem.c | 115 --------------------------------------- arch/sparc/mm/srmmu.c | 2 5 files changed, 6 insertions(+), 122 deletions(-) --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -139,6 +139,7 @@ config MMU config HIGHMEM bool default y if SPARC32 + select KMAP_LOCAL config ZONE_DMA bool --- a/arch/sparc/include/asm/highmem.h +++ b/arch/sparc/include/asm/highmem.h @@ -33,8 +33,6 @@ extern unsigned long highstart_pfn, high #define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE) extern pte_t *pkmap_page_table; -void kmap_init(void) __init; - /* * Right now we initialize only a single pte table. It can be extended * easily, subsequent pte tables have to be allocated in one physical @@ -53,6 +51,11 @@ void kmap_init(void) __init; #define flush_cache_kmaps() flush_cache_all() +/* FIXME: Use __flush_tlb_one(vaddr) instead of flush_cache_all() -- Anton */ +#define arch_kmap_local_post_map(vaddr, pteval) flush_cache_all() +#define arch_kmap_local_post_unmap(vaddr) flush_cache_all() + + #endif /* __KERNEL__ */ #endif /* _ASM_HIGHMEM_H */ --- a/arch/sparc/mm/Makefile +++ b/arch/sparc/mm/Makefile @@ -15,6 +15,3 @@ obj-$(CONFIG_SPARC32) += leon_mm.o # Only used by sparc64 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o - -# Only used by sparc32 -obj-$(CONFIG_HIGHMEM) += highmem.o --- a/arch/sparc/mm/highmem.c +++ /dev/null @@ -1,115 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * highmem.c: virtual kernel memory mappings for high memory - * - * Provides kernel-static versions of atomic kmap functions originally - * found as inlines in include/asm-sparc/highmem.h. These became - * needed as kmap_atomic() and kunmap_atomic() started getting - * called from within modules. - * -- Tomas Szepe , September 2002 - * - * But kmap_atomic() and kunmap_atomic() cannot be inlined in - * modules because they are loaded with btfixup-ped functions. - */ - -/* - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need it. - * - * XXX This is an old text. Actually, it's good to use atomic kmaps, - * provided you remember that they are atomic and not try to sleep - * with a kmap taken, much like a spinlock. Non-atomic kmaps are - * shared by CPUs, and so precious, and establishing them requires IPI. - * Atomic kmaps are lightweight and we may have NCPUS more of them. - */ -#include -#include -#include - -#include -#include -#include - -static pte_t *kmap_pte; - -void __init kmap_init(void) -{ - unsigned long address = __fix_to_virt(FIX_KMAP_BEGIN); - - /* cache the first kmap pte */ - kmap_pte = virt_to_kpte(address); -} - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned long vaddr; - long idx, type; - - type = kmap_atomic_idx_push(); - idx = type + KM_TYPE_NR*smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - -/* XXX Fix - Anton */ -#if 0 - __flush_cache_one(vaddr); -#else - flush_cache_all(); -#endif - -#ifdef CONFIG_DEBUG_HIGHMEM - BUG_ON(!pte_none(*(kmap_pte-idx))); -#endif - set_pte(kmap_pte-idx, mk_pte(page, prot)); -/* XXX Fix - Anton */ -#if 0 - __flush_tlb_one(vaddr); -#else - flush_tlb_all(); -#endif - - return (void*) vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; - int type; - - if (vaddr < FIXADDR_START) - return; - - type = kmap_atomic_idx(); - -#ifdef CONFIG_DEBUG_HIGHMEM - { - unsigned long idx; - - idx = type + KM_TYPE_NR * smp_processor_id(); - BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN+idx)); - - /* XXX Fix - Anton */ -#if 0 - __flush_cache_one(vaddr); -#else - flush_cache_all(); -#endif - - /* - * force other mappings to Oops if they'll try to access - * this pte without first remap it - */ - pte_clear(&init_mm, vaddr, kmap_pte-idx); - /* XXX Fix - Anton */ -#if 0 - __flush_tlb_one(vaddr); -#else - flush_tlb_all(); -#endif - } -#endif - - kmap_atomic_idx_pop(); -} -EXPORT_SYMBOL(kunmap_atomic_high); --- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -971,8 +971,6 @@ void __init srmmu_paging_init(void) sparc_context_init(num_contexts); - kmap_init(); - { unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };