From patchwork Fri Apr 19 16:54:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 13636667 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 85614C4345F for ; Fri, 19 Apr 2024 16:55:49 +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=4xiYsV5QaphmQUM4y9HedoXvQullyn5SemV9H7T0jq0=; b=3k+G+aCCeZXKbn i/rVWCFqr0YJjvgf5Nn+qTpGw+dy3oDKrGSAhD4cLfKNzh3ljvQQVyP9JsnVQMEShCrQYW0yUYpUY PQXa08Sm37DMn/MaVRZDF6nWJ2/Q8KwtGQL65yUq9FT86j9mTZoaNO0mmcYWM4ZgtIjptChzZ9R7R 8wvqNvq6zdE7FrHgYDt3gpJZLTcEWuBVAxfF+o9vwSEcjP26G8SoYNKgc0Jbe84zyg3YRMvzYRhK4 QrIacHPaTFZwyDknCkxj3BgJ3vO79oi7Ym1tZl13rHHGZTv1VdddziC3ibdUVBnOLXHJfp6K6QjQ+ Q1aONCw05AZ6F0bt9K/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxrWT-00000006RNi-26vx; Fri, 19 Apr 2024 16:55:37 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxrWG-00000006RDU-0xU5 for linux-arm-kernel@lists.infradead.org; Fri, 19 Apr 2024 16:55:25 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2C313153B; Fri, 19 Apr 2024 09:55:52 -0700 (PDT) Received: from e121345-lin.cambridge.arm.com (e121345-lin.cambridge.arm.com [10.1.196.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EC63C3F792; Fri, 19 Apr 2024 09:55:18 -0700 (PDT) From: Robin Murphy To: Joerg Roedel , Christoph Hellwig Cc: Vineet Gupta , Russell King , Catalin Marinas , Will Deacon , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Paul Walmsley , Palmer Dabbelt , Albert Ou , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Suravee Suthikulpanit , David Woodhouse , Lu Baolu , Niklas Schnelle , Matthew Rosato , Gerald Schaefer , Jean-Philippe Brucker , Rob Herring , Frank Rowand , Marek Szyprowski , Jason Gunthorpe , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, iommu@lists.linux.dev, devicetree@vger.kernel.org, Rob Herring , Jason Gunthorpe Subject: [PATCH v4 4/7] dma-mapping: Add helpers for dma_range_map bounds Date: Fri, 19 Apr 2024 17:54:43 +0100 Message-Id: <45ec52f033ec4dfb364e23f48abaf787f612fa53.1713523152.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.39.2.101.g768bb238c484.dirty In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240419_095524_433939_1C3F464D X-CRM114-Status: GOOD ( 14.15 ) 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 Several places want to compute the lower and/or upper bounds of a dma_range_map, so let's factor that out into reusable helpers. Acked-by: Rob Herring Reviewed-by: Christoph Hellwig Reviewed-by: Hanjun Guo # For arm64 Reviewed-by: Jason Gunthorpe Tested-by: Hanjun Guo Signed-off-by: Robin Murphy --- v2: fix warning for 32-bit builds --- arch/loongarch/kernel/dma.c | 9 ++------- drivers/acpi/arm64/dma.c | 8 +------- drivers/of/device.c | 11 ++--------- include/linux/dma-direct.h | 18 ++++++++++++++++++ 4 files changed, 23 insertions(+), 23 deletions(-) diff --git a/arch/loongarch/kernel/dma.c b/arch/loongarch/kernel/dma.c index 7a9c6a9dd2d0..429555fb4e13 100644 --- a/arch/loongarch/kernel/dma.c +++ b/arch/loongarch/kernel/dma.c @@ -8,17 +8,12 @@ void acpi_arch_dma_setup(struct device *dev) { int ret; - u64 mask, end = 0; + u64 mask, end; const struct bus_dma_region *map = NULL; ret = acpi_dma_get_range(dev, &map); if (!ret && map) { - const struct bus_dma_region *r = map; - - for (end = 0; r->size; r++) { - if (r->dma_start + r->size - 1 > end) - end = r->dma_start + r->size - 1; - } + end = dma_range_map_max(map); mask = DMA_BIT_MASK(ilog2(end) + 1); dev->bus_dma_limit = end; diff --git a/drivers/acpi/arm64/dma.c b/drivers/acpi/arm64/dma.c index b98a149f8d50..52b2abf88689 100644 --- a/drivers/acpi/arm64/dma.c +++ b/drivers/acpi/arm64/dma.c @@ -28,13 +28,7 @@ void acpi_arch_dma_setup(struct device *dev) ret = acpi_dma_get_range(dev, &map); if (!ret && map) { - const struct bus_dma_region *r = map; - - for (end = 0; r->size; r++) { - if (r->dma_start + r->size - 1 > end) - end = r->dma_start + r->size - 1; - } - + end = dma_range_map_max(map); dev->dma_range_map = map; } diff --git a/drivers/of/device.c b/drivers/of/device.c index 841ccd3a19d1..9e7963972fa7 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -117,16 +117,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np, if (!force_dma) return ret == -ENODEV ? 0 : ret; } else { - const struct bus_dma_region *r = map; - /* Determine the overall bounds of all DMA regions */ - for (dma_start = ~0; r->size; r++) { - /* Take lower and upper limits */ - if (r->dma_start < dma_start) - dma_start = r->dma_start; - if (r->dma_start + r->size > end) - end = r->dma_start + r->size; - } + dma_start = dma_range_map_min(map); + end = dma_range_map_max(map); } /* diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index 3eb3589ff43e..edbe13d00776 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -54,6 +54,24 @@ static inline phys_addr_t translate_dma_to_phys(struct device *dev, return (phys_addr_t)-1; } +static inline dma_addr_t dma_range_map_min(const struct bus_dma_region *map) +{ + dma_addr_t ret = (dma_addr_t)U64_MAX; + + for (; map->size; map++) + ret = min(ret, map->dma_start); + return ret; +} + +static inline dma_addr_t dma_range_map_max(const struct bus_dma_region *map) +{ + dma_addr_t ret = 0; + + for (; map->size; map++) + ret = max(ret, map->dma_start + map->size - 1); + return ret; +} + #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA #include #ifndef phys_to_dma_unencrypted