From patchwork Tue Feb 22 13:42:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoquan He X-Patchwork-Id: 12755109 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41B87C4332F for ; Tue, 22 Feb 2022 13:42:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232214AbiBVNnO (ORCPT ); Tue, 22 Feb 2022 08:43:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43812 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230468AbiBVNnN (ORCPT ); Tue, 22 Feb 2022 08:43:13 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id CA74C119843 for ; Tue, 22 Feb 2022 05:42:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1645537367; 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: in-reply-to:in-reply-to:references:references; bh=2uPQ0PrAQ4ziIfXTltU6gJp/EwSDQPeLt7vadw1dPrc=; b=MHH5xlq7eyC5xoX2bHeZTICnGVrpHzKIHPSe2/1QH8hNf4Z0mPUKiLDLd0zrPFozYpPKQw n+zmB3yzxWd2UaVX1I1SnSh12es1RtS2MlnqDQebrrclrcAt/GL57YKC1Dg7tAizCGvUZT Wx38L0JiWSTNVWXLFyNvS1w0P6bd8ns= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-372-_ooy5SJoPIK9TtAFxEoSiw-1; Tue, 22 Feb 2022 08:42:43 -0500 X-MC-Unique: _ooy5SJoPIK9TtAFxEoSiw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B56A0FC80; Tue, 22 Feb 2022 13:42:40 +0000 (UTC) Received: from localhost (ovpn-12-122.pek2.redhat.com [10.72.12.122]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E511D106D5B4; Tue, 22 Feb 2022 13:42:24 +0000 (UTC) Date: Tue, 22 Feb 2022 21:42:22 +0800 From: Baoquan He To: Christoph Hellwig Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, cl@linux.com, 42.hyeyoo@gmail.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, vbabka@suse.cz, David.Laight@aculab.com, david@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, linux-crypto@vger.kernel.org, steffen.klassert@secunet.com, netdev@vger.kernel.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, linux-s390@vger.kernel.org, michael@walle.cc, linux-i2c@vger.kernel.org, wsa@kernel.org Subject: [PATCH 2/2] kernel/dma: rename dma_alloc_direct and dma_map_direct Message-ID: References: <20220219005221.634-1-bhe@redhat.com> <20220219005221.634-22-bhe@redhat.com> <20220219071730.GG26711@lst.de> <20220220084044.GC93179@MiWiFi-R3L-srv> <20220222084530.GA6210@lst.de> <20220222131120.GB10093@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220222131120.GB10093@lst.de> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org In the old dma mapping, coherent mapping uses dma_alloc_coherent() to allocate DMA buffer and mapping; while streaming mapping can only get memory from slab or buddy allocator, then map with dma_map_single(). In that situation, dma_alloc_direct() checks a direct mapping for coherent DMA, dma_map_direct() checks a direct mapping for streaming DMA. However, several new APIs have been added for streaming mapping, e.g dma_alloc_pages(). These new APIs take care of DMA buffer allocating and mapping which are similar with dma_alloc_coherent(). So we should rename both of them to reflect their real intention to avoid confusion. dma_alloc_direct() ==> dma_coherent_direct() dma_map_direct() ==> dma_streaming_direct() Signed-off-by: Baoquan He --- kernel/dma/mapping.c | 44 ++++++++++++++++++++++---------------------- 1 file changed, 22 insertions(+), 22 deletions(-) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index e66847aeac67..2835b08e96c6 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -127,13 +127,13 @@ static bool dma_go_direct(struct device *dev, dma_addr_t mask, * This allows IOMMU drivers to set a bypass mode if the DMA mask is large * enough. */ -static inline bool dma_alloc_direct(struct device *dev, +static inline bool dma_coherent_direct(struct device *dev, const struct dma_map_ops *ops) { return dma_go_direct(dev, dev->coherent_dma_mask, ops); } -static inline bool dma_map_direct(struct device *dev, +static inline bool dma_streaming_direct(struct device *dev, const struct dma_map_ops *ops) { return dma_go_direct(dev, *dev->dma_mask, ops); @@ -151,7 +151,7 @@ dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page, if (WARN_ON_ONCE(!dev->dma_mask)) return DMA_MAPPING_ERROR; - if (dma_map_direct(dev, ops) || + if (dma_streaming_direct(dev, ops) || arch_dma_map_page_direct(dev, page_to_phys(page) + offset + size)) addr = dma_direct_map_page(dev, page, offset, size, dir, attrs); else @@ -168,7 +168,7 @@ void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size, const struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); - if (dma_map_direct(dev, ops) || + if (dma_streaming_direct(dev, ops) || arch_dma_unmap_page_direct(dev, addr + size)) dma_direct_unmap_page(dev, addr, size, dir, attrs); else if (ops->unmap_page) @@ -188,7 +188,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, if (WARN_ON_ONCE(!dev->dma_mask)) return 0; - if (dma_map_direct(dev, ops) || + if (dma_streaming_direct(dev, ops) || arch_dma_map_sg_direct(dev, sg, nents)) ents = dma_direct_map_sg(dev, sg, nents, dir, attrs); else @@ -277,7 +277,7 @@ void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, BUG_ON(!valid_dma_direction(dir)); debug_dma_unmap_sg(dev, sg, nents, dir); - if (dma_map_direct(dev, ops) || + if (dma_streaming_direct(dev, ops) || arch_dma_unmap_sg_direct(dev, sg, nents)) dma_direct_unmap_sg(dev, sg, nents, dir, attrs); else if (ops->unmap_sg) @@ -296,7 +296,7 @@ dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr, if (WARN_ON_ONCE(!dev->dma_mask)) return DMA_MAPPING_ERROR; - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs); else if (ops->map_resource) addr = ops->map_resource(dev, phys_addr, size, dir, attrs); @@ -312,7 +312,7 @@ void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size, const struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); - if (!dma_map_direct(dev, ops) && ops->unmap_resource) + if (!dma_streaming_direct(dev, ops) && ops->unmap_resource) ops->unmap_resource(dev, addr, size, dir, attrs); debug_dma_unmap_resource(dev, addr, size, dir); } @@ -324,7 +324,7 @@ void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, const struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) dma_direct_sync_single_for_cpu(dev, addr, size, dir); else if (ops->sync_single_for_cpu) ops->sync_single_for_cpu(dev, addr, size, dir); @@ -338,7 +338,7 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t addr, const struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) dma_direct_sync_single_for_device(dev, addr, size, dir); else if (ops->sync_single_for_device) ops->sync_single_for_device(dev, addr, size, dir); @@ -352,7 +352,7 @@ void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, const struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) dma_direct_sync_sg_for_cpu(dev, sg, nelems, dir); else if (ops->sync_sg_for_cpu) ops->sync_sg_for_cpu(dev, sg, nelems, dir); @@ -366,7 +366,7 @@ void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, const struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) dma_direct_sync_sg_for_device(dev, sg, nelems, dir); else if (ops->sync_sg_for_device) ops->sync_sg_for_device(dev, sg, nelems, dir); @@ -391,7 +391,7 @@ int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, { const struct dma_map_ops *ops = get_dma_ops(dev); - if (dma_alloc_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) return dma_direct_get_sgtable(dev, sgt, cpu_addr, dma_addr, size, attrs); if (!ops->get_sgtable) @@ -430,7 +430,7 @@ bool dma_can_mmap(struct device *dev) { const struct dma_map_ops *ops = get_dma_ops(dev); - if (dma_alloc_direct(dev, ops)) + if (dma_coherent_direct(dev, ops)) return dma_direct_can_mmap(dev); return ops->mmap != NULL; } @@ -455,7 +455,7 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, { const struct dma_map_ops *ops = get_dma_ops(dev); - if (dma_alloc_direct(dev, ops)) + if (dma_coherent_direct(dev, ops)) return dma_direct_mmap(dev, vma, cpu_addr, dma_addr, size, attrs); if (!ops->mmap) @@ -468,7 +468,7 @@ u64 dma_get_required_mask(struct device *dev) { const struct dma_map_ops *ops = get_dma_ops(dev); - if (dma_alloc_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) return dma_direct_get_required_mask(dev); if (ops->get_required_mask) return ops->get_required_mask(dev); @@ -499,7 +499,7 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, /* let the implementation decide on the zone to allocate from: */ flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); - if (dma_alloc_direct(dev, ops)) + if (dma_coherent_direct(dev, ops)) cpu_addr = dma_direct_alloc(dev, size, dma_handle, flag, attrs); else if (ops->alloc) cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs); @@ -531,7 +531,7 @@ void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, return; debug_dma_free_coherent(dev, size, cpu_addr, dma_handle); - if (dma_alloc_direct(dev, ops)) + if (dma_coherent_direct(dev, ops)) dma_direct_free(dev, size, cpu_addr, dma_handle, attrs); else if (ops->free) ops->free(dev, size, cpu_addr, dma_handle, attrs); @@ -550,7 +550,7 @@ static struct page *__dma_alloc_pages(struct device *dev, size_t size, gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); size = PAGE_ALIGN(size); - if (dma_alloc_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) return dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp); if (!ops->alloc_pages) return NULL; @@ -574,7 +574,7 @@ static void __dma_free_pages(struct device *dev, size_t size, struct page *page, const struct dma_map_ops *ops = get_dma_ops(dev); size = PAGE_ALIGN(size); - if (dma_alloc_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) dma_direct_free_pages(dev, size, page, dma_handle, dir); else if (ops->free_pages) ops->free_pages(dev, size, page, dma_handle, dir); @@ -769,7 +769,7 @@ size_t dma_max_mapping_size(struct device *dev) const struct dma_map_ops *ops = get_dma_ops(dev); size_t size = SIZE_MAX; - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) size = dma_direct_max_mapping_size(dev); else if (ops && ops->max_mapping_size) size = ops->max_mapping_size(dev); @@ -782,7 +782,7 @@ bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) { const struct dma_map_ops *ops = get_dma_ops(dev); - if (dma_map_direct(dev, ops)) + if (dma_streaming_direct(dev, ops)) return dma_direct_need_sync(dev, dma_addr); return ops->sync_single_for_cpu || ops->sync_single_for_device; }