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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 23B4EC77B7C for ; Wed, 25 Jun 2025 20:35:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:CC:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=lbSifWasdA8Lr1V7BJ5flJdfB31gk5DG3a5h3H59748=; b=eYcML1ztpICLdZ2rxl3uMb/3YW zwOWC+az8HqRRmsoHt59/KXHD1wkO+6IRsiA2pUyi2bchJaiU9UgCxWxOu0rGImXNV5CN4LkPyNy7 zDfb7/XyiN5B9PKBmDoZrIUaoR0rzqnIN2oHmzQKOhLkNUmggYGkjxAajFeJVixRvLNNcujOoB2O6 8YwNVZVQhiw76TG809EyVVqiqgTuKA5K2lHp8IEOW4F/eYklWfbhLCN7PE32eMmzpsrUnSwHtHO7n OC7J/WGgupRqaYQbYcmGoFbl08GFJ6X7sRnJL5Ojpoob+SJ+dySWV6mi72RtVmbjbY3/jJRIgG0sw EAUwYXVg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uUWpi-00000009r8s-3A8p; Wed, 25 Jun 2025 20:35:02 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uUTGr-00000009MQ5-40OU for linux-arm-kernel@lists.infradead.org; Wed, 25 Jun 2025 16:46:51 +0000 Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4bS74s1KL9z67M9n; Thu, 26 Jun 2025 00:46:37 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id D74631402EC; Thu, 26 Jun 2025 00:46:40 +0800 (CST) Received: from localhost (10.203.177.66) by frapeml500008.china.huawei.com (7.182.85.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Wed, 25 Jun 2025 18:46:39 +0200 Date: Wed, 25 Jun 2025 17:46:37 +0100 From: Jonathan Cameron To: Catalin Marinas , , , , , , , , Will Deacon , Dan Williams , Davidlohr Bueso , CC: Yicong Yang , Yushan Wang , Lorenzo Pieralisi , "Mark Rutland" , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , , H Peter Anvin , Andy Lutomirski , Peter Zijlstra Subject: Re: [PATCH v2 2/8] generic: Support ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION Message-ID: <20250625174637.0000732b@huawei.com> In-Reply-To: <20250624154805.66985-3-Jonathan.Cameron@huawei.com> References: <20250624154805.66985-1-Jonathan.Cameron@huawei.com> <20250624154805.66985-3-Jonathan.Cameron@huawei.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.66] X-ClientProxiedBy: lhrpeml100003.china.huawei.com (7.191.160.210) To frapeml500008.china.huawei.com (7.182.85.71) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250625_094650_163146_109085A1 X-CRM114-Status: GOOD ( 16.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 24 Jun 2025 16:47:58 +0100 Jonathan Cameron wrote: > From: Yicong Yang > > ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION provides the mechanism for > invalidate certain memory regions in a cache-incoherent manner. > Currently is used by NVIDMM adn CXL memory. This is mainly done > by the system component and is implementation define per spec. > Provides a method for the platforms register their own invalidate > method and implement ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION. > > Architectures can opt in for this support via > CONFIG_GENERIC_CPU_CACHE_INVALIDATE_MEMREGION. > > Signed-off-by: Yicong Yang > Signed-off-by: Jonathan Cameron > diff --git a/drivers/base/cache.c b/drivers/base/cache.c > new file mode 100644 > index 000000000000..8d351657bbef > --- /dev/null > +++ b/drivers/base/cache.c > @@ -0,0 +1,46 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Generic support for CPU Cache Invalidate Memregion > + */ > + > +#include I got carried away dropping some unused headers. This needs linux/memregion.h > +#include > +#include > + So that the following have 'previous' prototypes. > +int cpu_cache_invalidate_memregion(int res_desc, phys_addr_t start, size_t len) > +{ > + guard(spinlock_irqsave)(&scfm_lock); > + if (!scfm_data) > + return -EOPNOTSUPP; > + > + return scfm_data->invalidate_memregion(res_desc, start, len); > +} > +EXPORT_SYMBOL_NS_GPL(cpu_cache_invalidate_memregion, "DEVMEM"); > + > +bool cpu_cache_has_invalidate_memregion(void) > +{ > + guard(spinlock_irqsave)(&scfm_lock); > + return !!scfm_data; > +} > +EXPORT_SYMBOL_NS_GPL(cpu_cache_has_invalidate_memregion, "DEVMEM");