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 F2847CA0EDC for ; Wed, 20 Aug 2025 11:17:50 +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-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zIMcFQUNBT/y4kaUGdf6TotNLXJDt4Sk2unZ7wGQjeg=; b=DwozMePuay1DGtAJq9IXr22VpZ bg53v7CiYptjewsjmNhEF3sw3jINE7lD8YyZBIoEjJYjbnJqUYSkcmWJwkJz+D6mswXOzltDCTiWd Tabq2wNBd9g5GYZ0jQWINMZw0wdKOsTSNtL1Q3H0gZmF0jOjHOK51Cg+iKRQy/LWBFR+xQ6e0bcua aHXTDczz073YCwWyBzqCdax6MbyaYl5/pVAU4+FJlplLpRvznLkCr+gWxpjJKZlHUj44pAJ6YREnB KTjuIYk74bcHq6Fqfrck1lzBg5cNWVSjGN+VK70eykuBpla1X+kWIHbGkPGuVacjfKISoxXgPdMOt gsQWwMnQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uogp7-0000000DM28-1cUF; Wed, 20 Aug 2025 11:17:45 +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 1uog5o-0000000DAIJ-21gr for linux-arm-kernel@lists.infradead.org; Wed, 20 Aug 2025 10:30:57 +0000 Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4c6N334QwLz6M4pc; Wed, 20 Aug 2025 18:28:47 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id EB362140119; Wed, 20 Aug 2025 18:30:54 +0800 (CST) Received: from SecurePC-101-06.huawei.com (10.122.19.247) 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, 20 Aug 2025 12:30:54 +0200 From: Jonathan Cameron To: Catalin Marinas , , , , , , , Will Deacon , Dan Williams , Davidlohr Bueso , "H . Peter Anvin" , Peter Zijlstra CC: Yicong Yang , , Yushan Wang , Lorenzo Pieralisi , Mark Rutland , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , , Andy Lutomirski Subject: [PATCH v3 2/8] memregion: Support fine grained invalidate by cpu_cache_invalidate_memregion() Date: Wed, 20 Aug 2025 11:29:44 +0100 Message-ID: <20250820102950.175065-3-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250820102950.175065-1-Jonathan.Cameron@huawei.com> References: <20250820102950.175065-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.122.19.247] X-ClientProxiedBy: lhrpeml500005.china.huawei.com (7.191.163.240) 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-20250820_033056_810675_B61B7A92 X-CRM114-Status: GOOD ( 17.63 ) 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 From: Yicong Yang Extend cpu_cache_invalidate_memregion() to support invalidate certain range of memory by introducing start and length parameters. Control of types of invalidation is left for when usecases turn up. For now everything is Clean and Invalidate. Signed-off-by: Yicong Yang Acked-by: Davidlohr Bueso Signed-off-by: Jonathan Cameron --- v3: Rebase on top of previous patch that removed the IO_RESDESC_* parameter. --- arch/x86/mm/pat/set_memory.c | 2 +- drivers/cxl/core/region.c | 5 ++++- drivers/nvdimm/region.c | 2 +- drivers/nvdimm/region_devs.c | 2 +- include/linux/memregion.h | 7 +++++-- 5 files changed, 12 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 4019b17fb65e..292c7202faed 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -368,7 +368,7 @@ bool cpu_cache_has_invalidate_memregion(void) } EXPORT_SYMBOL_NS_GPL(cpu_cache_has_invalidate_memregion, "DEVMEM"); -int cpu_cache_invalidate_memregion(void) +int cpu_cache_invalidate_memregion(phys_addr_t start, size_t len) { if (WARN_ON_ONCE(!cpu_cache_has_invalidate_memregion())) return -ENXIO; diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index d7fa76810f82..410e41cef5d3 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -228,7 +228,10 @@ static int cxl_region_invalidate_memregion(struct cxl_region *cxlr) return -ENXIO; } - cpu_cache_invalidate_memregion(); + if (!cxlr->params.res) + return -ENXIO; + cpu_cache_invalidate_memregion(cxlr->params.res->start, + resource_size(cxlr->params.res)); return 0; } diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c index c43506448edf..62535d200402 100644 --- a/drivers/nvdimm/region.c +++ b/drivers/nvdimm/region.c @@ -110,7 +110,7 @@ static void nd_region_remove(struct device *dev) * here is ok. */ if (cpu_cache_has_invalidate_memregion()) - cpu_cache_invalidate_memregion(); + cpu_cache_invalidate_memregion(0, -1); } static int child_notify(struct device *dev, void *data) diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index 3cdd93d40997..7c1d27c75b73 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -90,7 +90,7 @@ static int nd_region_invalidate_memregion(struct nd_region *nd_region) } } - cpu_cache_invalidate_memregion(); + cpu_cache_invalidate_memregion(0, -1); out: for (i = 0; i < nd_region->ndr_mappings; i++) { struct nd_mapping *nd_mapping = &nd_region->mapping[i]; diff --git a/include/linux/memregion.h b/include/linux/memregion.h index 945646bde825..428635562302 100644 --- a/include/linux/memregion.h +++ b/include/linux/memregion.h @@ -27,6 +27,9 @@ static inline void memregion_free(int id) /** * cpu_cache_invalidate_memregion - drop any CPU cached data for * memregion + * @start: start physical address of the target memory region. + * @len: length of the target memory region. -1 for all the regions of + * the target type. * * Perform cache maintenance after a memory event / operation that * changes the contents of physical memory in a cache-incoherent manner. @@ -45,7 +48,7 @@ static inline void memregion_free(int id) * the cache maintenance. */ #ifdef CONFIG_ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION -int cpu_cache_invalidate_memregion(void); +int cpu_cache_invalidate_memregion(phys_addr_t start, size_t len); bool cpu_cache_has_invalidate_memregion(void); #else static inline bool cpu_cache_has_invalidate_memregion(void) @@ -53,7 +56,7 @@ static inline bool cpu_cache_has_invalidate_memregion(void) return false; } -static inline int cpu_cache_invalidate_memregion(void) +static inline int cpu_cache_invalidate_memregion(phys_addr_t start, size_t len) { WARN_ON_ONCE("CPU cache invalidation required"); return -ENXIO; -- 2.48.1