From patchwork Wed Dec 11 12:07:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 11284831 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 1F908139A for ; Wed, 11 Dec 2019 12:31:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D54A220836 for ; Wed, 11 Dec 2019 12:31:37 +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="WrnTBGto" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D54A220836 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3468D6B31F5; Wed, 11 Dec 2019 07:31:22 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2815C6B31F3; Wed, 11 Dec 2019 07:31:22 -0500 (EST) 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 0D9376B31F4; Wed, 11 Dec 2019 07:31:21 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0243.hostedemail.com [216.40.44.243]) by kanga.kvack.org (Postfix) with ESMTP id C9CC26B31F1 for ; Wed, 11 Dec 2019 07:31:21 -0500 (EST) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 7657A180AD817 for ; Wed, 11 Dec 2019 12:31:21 +0000 (UTC) X-FDA: 76252795962.21.dogs37_45fdc97efea1e X-Spam-Summary: 2,0,0,691b7ea845e0b611,d41d8cd98f00b204,peterz@infradead.org,:will@kernel.org:aneesh.kumar@linux.ibm.com:akpm@linux-foundation.org:npiggin@gmail.com:peterz@infradead.org:linux-arch@vger.kernel.org::linux-kernel@vger.kernel.org:ysato@users.sourceforge.jp:dalias@libc.org:davem@davemloft.net:deller@gmx.de:geert@linux-m68k.org:paulburton@kernel.org:tony.luck@intel.com:rth@twiddle.net:nickhu@andestech.com:paul.walmsley@sifive.com:paul.burton@mips.com,RULES_HIT:41:152:355:379:800:960:965:966:968:973:988:989:1042:1183:1260:1261:1277:1313:1314:1345:1431:1437:1516:1518:1535:1543:1593:1594:1711:1730:1747:1777:1792:1981:2194:2196:2198:2199:2200:2201:2393:2559:2562:2731:2903:3138:3139:3140:3141:3142:3355:3865:3867:3870:3871:3872:3874:4117:4250:4385:4390:4395:4605:5007:6119:6261:6653:6742:7875:7903:8634:10004:10400:11026:11473:11657:11658:11914:12043:12048:12291:12296:12297:12438:12517:12519:12683:14181:14394:14659:14721:14877:21080:21451:21627:21772:21990:30003:30054:3005 5,0,RBL: X-HE-Tag: dogs37_45fdc97efea1e X-Filterd-Recvd-Size: 6424 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Dec 2019 12:31:20 +0000 (UTC) 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=Kmci9S6AR0FYTskb+05odp4dpXOL68/q4robJqM04t0=; b=WrnTBGtoDFlccGkA5QZK9j0uWw 57DBHjQs0S/lsu1PhmhB9IFpejHbtD9kJq7MeSq8LN4BazpDPoWGfZgdkZid6plViTf+3YXazhJfu VZOZo2nvohUmKhR9bOufnk25W2mgUeXw5Tfo7KFJfoRIwMOfddpM5oPxw6nA9kwv6owTz/y4qRZ8E tnbT0r8MQDL8luI0zqxoflw/kl3Q0PeOEXULKaQURxxxtYHg7wZqt2vrofd2zT0vljXj+RbcexQWz 1nYzsUwh7KcGVspUYsRZVZh2ms+UsnKRtgHlhQtz2bdo4U9wjvzXJrCMPmQtQw1R8ZzLhOaPooP6D nt7poLqQ==; 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 1if193-0001Pj-2S; Wed, 11 Dec 2019 12:31:09 +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 F0A57306CBC; Wed, 11 Dec 2019 13:29:43 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 4BA3120137CBA; Wed, 11 Dec 2019 13:31:02 +0100 (CET) Message-Id: <20191211122956.399804770@infradead.org> User-Agent: quilt/0.65 Date: Wed, 11 Dec 2019 13:07:26 +0100 From: Peter Zijlstra To: Will Deacon , "Aneesh Kumar K.V" , Andrew Morton , Nick Piggin , Peter Zijlstra Cc: linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yoshinori Sato , Rich Felker , "David S. Miller" , Helge Deller , Geert Uytterhoeven , Paul Burton , Tony Luck , Richard Henderson , Nick Hu , Paul Walmsley , Paul Burton Subject: [PATCH 13/17] mips/tlb: Fix __p*_free_tlb() References: <20191211120713.360281197@infradead.org> MIME-Version: 1.0 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: Just like regular pages, page directories need to observe the following order: 1) unhook 2) TLB invalidate 3) free to ensure it is safe against concurrent accesses. MIPS has (thanks to Paul Burton for setting me straight): - HAVE_FAST_GUP, which means we need to consider software walkers (many MIPS also have software TLB-fill, which is a similar software walker). - non-page, page directories, which requires a custom table free. - Mostly IPI-based TLB invalidate, but it wouldn't be MIPS if it didn't also have broadcast TLB invalidate (I6500, GINVT). This means that in generic MIPS needs HAVE_RCU_TABLE_FREE. Cc: Paul Burton Signed-off-by: Peter Zijlstra (Intel) --- arch/mips/Kconfig | 1 + arch/mips/include/asm/pgalloc.h | 13 ++++++------- arch/mips/mm/pgtable.c | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 41 insertions(+), 7 deletions(-) --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -57,6 +57,7 @@ config MIPS select HAVE_DYNAMIC_FTRACE select HAVE_EXIT_THREAD select HAVE_FAST_GUP + select MMU_GATHER_RCU_TABLE_FREE select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_TRACER --- a/arch/mips/include/asm/pgalloc.h +++ b/arch/mips/include/asm/pgalloc.h @@ -41,6 +41,9 @@ static inline void pud_populate(struct m } #endif +extern void __tlb_remove_table(void *table); +extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int idx); + /* * Initialize a new pgd / pmd table with invalid pointers. */ @@ -52,11 +55,7 @@ static inline void pgd_free(struct mm_st free_pages((unsigned long)pgd, PGD_ORDER); } -#define __pte_free_tlb(tlb,pte,address) \ -do { \ - pgtable_pte_page_dtor(pte); \ - tlb_remove_page((tlb), pte); \ -} while (0) +#define __pte_free_tlb(tlb,pte,address) pgtable_free_tlb((tlb), (pte), 0) #ifndef __PAGETABLE_PMD_FOLDED @@ -75,7 +74,7 @@ static inline void pmd_free(struct mm_st free_pages((unsigned long)pmd, PMD_ORDER); } -#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x) +#define __pmd_free_tlb(tlb, x, addr) pgtable_free_tlb((tlb), (x), 1) #endif @@ -101,7 +100,7 @@ static inline void p4d_populate(struct m set_p4d(p4d, __p4d((unsigned long)pud)); } -#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x) +#define __pud_free_tlb(tlb, x, addr) pgtable_free_tlb((tlb), (x), 2) #endif /* __PAGETABLE_PUD_FOLDED */ --- a/arch/mips/mm/pgtable.c +++ b/arch/mips/mm/pgtable.c @@ -7,6 +7,7 @@ #include #include #include +#include pgd_t *pgd_alloc(struct mm_struct *mm) { @@ -23,3 +24,36 @@ pgd_t *pgd_alloc(struct mm_struct *mm) return ret; } EXPORT_SYMBOL_GPL(pgd_alloc); + +#define TLB_IDX_MASK 0x3 + +void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int idx) +{ + unsigned long pgf = (unsigned long)table; + BUG_ON(idx > TLB_IDX_MASK); + BUG_ON(pgf & TLB_IDX_MASK); + pgf |= idx; + tlb_remove_table(tlb, (void *)pgf); +} + +void __tlb_remove_table(void *table) +{ + void *dir = (void *)((unsigned long)table & ~TLB_IDX_MASK); + int idx = (unsigned long)table & TLB_IDX_MASK; + + switch (idx) { +#ifndef __PAGETABLE_PUD_FOLDED + case 2: /* PUD */ + pud_free(NULL, dir); + break; +#endif +#ifndef __PAGETABLE_PMD_FOLDED + case 1: /* PMD */ + pmd_free(NULL, dir); + break; +#endif + case 0: /* PTE */ + pte_free(NULL, dir); + break; + } +}