From patchwork Sat Sep 19 09:18:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11788619 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 A6D2C59D for ; Mon, 21 Sep 2020 07:36:32 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 76A0421789 for ; Mon, 21 Sep 2020 07:36:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="4aGjXseo"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Z+O8xe+M" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76A0421789 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5B70D6E231; Mon, 21 Sep 2020 07:36:30 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 55B686E202; Sat, 19 Sep 2020 09:50:13 +0000 (UTC) Message-Id: <20200919092616.736510871@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1600509011; 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=KCsaboacsuJ88jqIg0buxiu+ksgl22D90Mxj1XlMJa8=; b=4aGjXseoaPwfvC1RztSPZmMPssvx2DAHZ0yqYHLoXSYiocGwX1jEFz1j94PvUMprh1rKNl epJRsEhX8k8BXyGAbHBQcU8ti2G1WgSmO45ofO7u685Iiiq33ZlBm40IDsBQx4SVN1qG8p NvNgwqpPxE7jmG6tO5AwRcx3XLlluU4maXhXXRVsvbIFK11+FNNbChWbuzWY2FrHT1sH7C jTR6uDLqw/6GXaa62jrp2/RD9ANnlOBeRj5oltXG0EtUxVFJhgkUrLkw6SsHV0NWbDq+nQ iKJgZmVYUCq01IQvsyKTNQnpNYvIqMR5MAwU0vq6advwfeunO0NLj41fZ7cRlA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1600509011; 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=KCsaboacsuJ88jqIg0buxiu+ksgl22D90Mxj1XlMJa8=; b=Z+O8xe+MGt5jyRp84X/pvcvuy8DIoXD1jiMiTNmpv474C8OxJBYxsbYAxaWRzNO/Jc2Oo6 D5mWn+A1kiGj7wCw== Date: Sat, 19 Sep 2020 11:18:00 +0200 From: Thomas Gleixner To: LKML Subject: [patch RFC 09/15] nds32/mm/highmem: Switch to generic kmap atomic References: <20200919091751.011116649@linutronix.de> MIME-Version: 1.0 X-Mailman-Approved-At: Mon, 21 Sep 2020 07:34:45 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juri Lelli , Peter Zijlstra , Sebastian Andrzej Siewior , dri-devel , Ben Segall , Max Filippov , Guo Ren , sparclinux@vger.kernel.org, Vincent Chen , Will Deacon , Ard Biesheuvel , linux-arch@vger.kernel.org, Vincent Guittot , Herbert Xu , Michael Ellerman , x86@kernel.org, Russell King , linux-csky@vger.kernel.org, David Airlie , Mel Gorman , linux-snps-arc@lists.infradead.org, linux-xtensa@linux-xtensa.org, Paul McKenney , intel-gfx , linuxppc-dev@lists.ozlabs.org, Steven Rostedt , Linus Torvalds , Rodrigo Vivi , Dietmar Eggemann , Linux ARM , Chris Zankel , Michal Simek , Thomas Bogendoerfer , Nick Hu , Linux-MM , Vineet Gupta , linux-mips@vger.kernel.org, Arnd Bergmann , Paul Mackerras , Andrew Morton , Daniel Bristot de Oliveira , "David S. Miller" , Greentime Hu Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The mapping code is odd and looks broken. See FIXME in the comment. Signed-off-by: Thomas Gleixner Cc: Nick Hu Cc: Greentime Hu Cc: Vincent Chen --- Note: Completely untested --- arch/nds32/Kconfig.cpu | 1 arch/nds32/include/asm/highmem.h | 21 +++++++++++++---- arch/nds32/mm/Makefile | 1 arch/nds32/mm/highmem.c | 48 --------------------------------------- 4 files changed, 17 insertions(+), 54 deletions(-) --- a/arch/nds32/Kconfig.cpu +++ b/arch/nds32/Kconfig.cpu @@ -157,6 +157,7 @@ config HW_SUPPORT_UNALIGNMENT_ACCESS config HIGHMEM bool "High Memory Support" depends on MMU && !CPU_CACHE_ALIASING + select KMAP_ATOMIC_GENERIC help The address space of Andes processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address --- a/arch/nds32/include/asm/highmem.h +++ b/arch/nds32/include/asm/highmem.h @@ -45,11 +45,22 @@ extern pte_t *pkmap_page_table; extern void kmap_init(void); /* - * The following functions are already defined by - * when CONFIG_HIGHMEM is not set. + * FIXME: The below looks broken vs. a kmap_atomic() in task context which + * is interupted and another kmap_atomic() happens in interrupt context. + * But what do I know about nds32. -- tglx */ -#ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_pfn(unsigned long pfn); -#endif +#define arch_kmap_temp_post_map(vaddr, pteval) \ + do { \ + __nds32__tlbop_inv(vaddr); \ + __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); \ + __nds32__tlbop_rwr(pteval); \ + __nds32__isb(); \ + } while (0) + +#define arch_kmap_temp_pre_unmap(vaddr, pte) \ + do { \ + __nds32__tlbop_inv(vaddr); \ + __nds32__isb(); \ + } while (0) #endif --- a/arch/nds32/mm/Makefile +++ b/arch/nds32/mm/Makefile @@ -3,7 +3,6 @@ obj-y := extable.o tlb.o fault.o init mm-nds32.o cacheflush.o proc.o obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o -obj-$(CONFIG_HIGHMEM) += highmem.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_proc.o = $(CC_FLAGS_FTRACE) --- a/arch/nds32/mm/highmem.c +++ /dev/null @@ -1,48 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -// Copyright (C) 2005-2017 Andes Technology Corporation - -#include -#include -#include -#include -#include -#include -#include -#include - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned int idx; - unsigned long vaddr, pte; - int type; - pte_t *ptep; - - type = kmap_atomic_idx_push(); - - idx = type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; - ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); - set_pte(ptep, pte); - - __nds32__tlbop_inv(vaddr); - __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); - __nds32__tlbop_rwr(pte); - __nds32__isb(); - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - if (kvaddr >= (void *)FIXADDR_START) { - unsigned long vaddr = (unsigned long)kvaddr; - pte_t *ptep; - kmap_atomic_idx_pop(); - __nds32__tlbop_inv(vaddr); - __nds32__isb(); - ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); - set_pte(ptep, 0); - } -} -EXPORT_SYMBOL(kunmap_atomic_high);