From patchwork Wed May 24 17:18:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 13254355 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 187DEC7EE2D for ; Wed, 24 May 2023 17:19:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id: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=2RHgzttbM9rAEte1ji/gzHcir6wX8/rwZRwQyWjuV3Y=; b=ELSS65rM3k/bHm bhPSUHpfiKvi8A2dLbi0sobB+8s7sEsljgqGpRd7eVWPqvJOrngr753E77NqTkUYchTRaHWLNtN8c QOb21lcgF9O4NL6hbVFPbiA8GAEJ8dK3KKkChofT6300ri9bAwVBFeVfUo4MK/tzxlSzn5WRei3Ie 51oNt12DmI6N6K0UpAocz+VyuNOe59KTL0Xjhr3rwJ5B1u9LEAt0ZzEscDiMopaiWyewvOVoXm32z H7QeJ1Dv+snFnc3OO+kR35408DbeWN0ELrVeBryp5Iq9HEo3dpfTCNZH7oxTUOol8X3DCUD0jluva flFYeh5nMoEMmOvcoRyg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q1s8w-00E8cb-1u; Wed, 24 May 2023 17:19:22 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q1s8p-00E8Zc-16 for linux-arm-kernel@lists.infradead.org; Wed, 24 May 2023 17:19:16 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BBED363E21; Wed, 24 May 2023 17:19:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8063AC4339C; Wed, 24 May 2023 17:19:10 +0000 (UTC) From: Catalin Marinas To: Linus Torvalds , Christoph Hellwig , Robin Murphy Cc: Arnd Bergmann , Greg Kroah-Hartman , Will Deacon , Marc Zyngier , Andrew Morton , Herbert Xu , Ard Biesheuvel , Isaac Manjarres , Saravana Kannan , Alasdair Kergon , Daniel Vetter , Joerg Roedel , Mark Brown , Mike Snitzer , "Rafael J. Wysocki" , linux-mm@kvack.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 01/15] mm/slab: Decouple ARCH_KMALLOC_MINALIGN from ARCH_DMA_MINALIGN Date: Wed, 24 May 2023 18:18:50 +0100 Message-Id: <20230524171904.3967031-2-catalin.marinas@arm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230524171904.3967031-1-catalin.marinas@arm.com> References: <20230524171904.3967031-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230524_101915_452125_5BBCE06D X-CRM114-Status: GOOD ( 17.80 ) 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 In preparation for supporting a kmalloc() minimum alignment smaller than the arch DMA alignment, decouple the two definitions. This requires that either the kmalloc() caches are aligned to a (run-time) cache-line size or the DMA API bounces unaligned kmalloc() allocations. Subsequent patches will implement both options. After this patch, ARCH_DMA_MINALIGN is expected to be used in static alignment annotations and defined by an architecture to be the maximum alignment for all supported configurations/SoCs in a single Image. Architectures opting in to a smaller ARCH_KMALLOC_MINALIGN will need to define its value in the arch headers. Since ARCH_DMA_MINALIGN is now always defined, adjust the #ifdef in dma_get_cache_alignment() so that there is no change for architectures not requiring a minimum DMA alignment. Signed-off-by: Catalin Marinas Cc: Andrew Morton Cc: Christoph Hellwig Cc: Robin Murphy --- include/linux/dma-mapping.h | 2 +- include/linux/slab.h | 14 +++++++++++--- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 0ee20b764000..3288a1339271 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -545,7 +545,7 @@ static inline int dma_set_min_align_mask(struct device *dev, static inline int dma_get_cache_alignment(void) { -#ifdef ARCH_DMA_MINALIGN +#ifdef ARCH_HAS_DMA_MINALIGN return ARCH_DMA_MINALIGN; #endif return 1; diff --git a/include/linux/slab.h b/include/linux/slab.h index 6b3e155b70bf..50dcf9cfbf62 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -235,12 +235,20 @@ void kmem_dump_obj(void *object); * alignment larger than the alignment of a 64-bit integer. * Setting ARCH_DMA_MINALIGN in arch headers allows that. */ -#if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 +#ifdef ARCH_DMA_MINALIGN +#define ARCH_HAS_DMA_MINALIGN +#if ARCH_DMA_MINALIGN > 8 && !defined(ARCH_KMALLOC_MINALIGN) #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN -#define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN -#define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN) +#endif #else +#define ARCH_DMA_MINALIGN __alignof__(unsigned long long) +#endif + +#ifndef ARCH_KMALLOC_MINALIGN #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) +#elif ARCH_KMALLOC_MINALIGN > 8 +#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN +#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) #endif /*