From patchwork Mon Sep 2 13:03:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11126673 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 46AA31399 for ; Mon, 2 Sep 2019 13:05:37 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 223F12168B for ; Mon, 2 Sep 2019 13:05:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="k5utAYi5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 223F12168B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1i4m0G-0003aM-Ps; Mon, 02 Sep 2019 13:04:16 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1i4m0E-0003Zr-Rf for xen-devel@lists.xenproject.org; Mon, 02 Sep 2019 13:04:14 +0000 X-Inumbo-ID: 21089aa6-cd82-11e9-8980-bc764e2007e4 Received: from bombadil.infradead.org (unknown [2607:7c80:54:e::133]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 21089aa6-cd82-11e9-8980-bc764e2007e4; Mon, 02 Sep 2019 13:03:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=1EUMcSIJcoIdNfawPXZnVgY52ahSnbBC8m8PhYzXTXA=; b=k5utAYi5JMaI+tNLk+JqU3cYPq ES/RPpYKu/0+MJJyhyUWB8MZooMiKKk7ttAzi/Bx8+FnN5xNr6WrHUuxyHTm+PHnNHJBDdrRdn2LE Xuc8LfBBext3QGCwpodJeI/BenP/OttPTQcXH0v6PvYtkqOYHYYCvC87VA+LpVmhcIFrkalVBwmmB FprUemrYreEomdPDXYHH6hMFLyHHcQtLIlhhx40meDQrChenDBupbuM5wDzJiUVFrXGplxHpPWrtM ABldLkOsAWpYncGCV6qvjoFHERsKH/LWhZZi8FCs/Gf4qwlgBdn/CccHrVd5E/PGeoLKbZplwUU2e xQwZS2RA==; Received: from [2001:4bb8:18c:1755:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1i4lzv-0001NV-As; Mon, 02 Sep 2019 13:03:55 +0000 From: Christoph Hellwig To: Stefano Stabellini , Konrad Rzeszutek Wilk , gross@suse.com, boris.ostrovsky@oracle.com Date: Mon, 2 Sep 2019 15:03:30 +0200 Message-Id: <20190902130339.23163-5-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190902130339.23163-1-hch@lst.de> References: <20190902130339.23163-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Subject: [Xen-devel] [PATCH 04/13] xen/arm: simplify dma_cache_maint X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org, x86@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Calculate the required operation in the caller, and pass it directly instead of recalculating it for each page, and use simple arithmetics to get from the physical address to Xen page size aligned chunks. Signed-off-by: Christoph Hellwig Reviewed-by: Stefano Stabellini --- arch/arm/xen/mm.c | 61 ++++++++++++++++------------------------------- 1 file changed, 21 insertions(+), 40 deletions(-) diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c index 90574d89d0d4..2fde161733b0 100644 --- a/arch/arm/xen/mm.c +++ b/arch/arm/xen/mm.c @@ -35,64 +35,45 @@ unsigned long xen_get_swiotlb_free_pages(unsigned int order) return __get_free_pages(flags, order); } -enum dma_cache_op { - DMA_UNMAP, - DMA_MAP, -}; static bool hypercall_cflush = false; -/* functions called by SWIOTLB */ - -static void dma_cache_maint(dma_addr_t handle, unsigned long offset, - size_t size, enum dma_data_direction dir, enum dma_cache_op op) +/* buffers in highmem or foreign pages cannot cross page boundaries */ +static void dma_cache_maint(dma_addr_t handle, size_t size, u32 op) { struct gnttab_cache_flush cflush; - unsigned long xen_pfn; - size_t left = size; - xen_pfn = (handle >> XEN_PAGE_SHIFT) + offset / XEN_PAGE_SIZE; - offset %= XEN_PAGE_SIZE; + cflush.a.dev_bus_addr = handle & XEN_PAGE_MASK; + cflush.offset = xen_offset_in_page(handle); + cflush.op = op; do { - size_t len = left; - - /* buffers in highmem or foreign pages cannot cross page - * boundaries */ - if (len + offset > XEN_PAGE_SIZE) - len = XEN_PAGE_SIZE - offset; - - cflush.op = 0; - cflush.a.dev_bus_addr = xen_pfn << XEN_PAGE_SHIFT; - cflush.offset = offset; - cflush.length = len; - - if (op == DMA_UNMAP && dir != DMA_TO_DEVICE) - cflush.op = GNTTAB_CACHE_INVAL; - if (op == DMA_MAP) { - if (dir == DMA_FROM_DEVICE) - cflush.op = GNTTAB_CACHE_INVAL; - else - cflush.op = GNTTAB_CACHE_CLEAN; - } - if (cflush.op) - HYPERVISOR_grant_table_op(GNTTABOP_cache_flush, &cflush, 1); + if (size + cflush.offset > XEN_PAGE_SIZE) + cflush.length = XEN_PAGE_SIZE - cflush.offset; + else + cflush.length = size; + + HYPERVISOR_grant_table_op(GNTTABOP_cache_flush, &cflush, 1); - offset = 0; - xen_pfn++; - left -= len; - } while (left); + cflush.offset = 0; + cflush.a.dev_bus_addr += cflush.length; + size -= cflush.length; + } while (size); } static void __xen_dma_page_dev_to_cpu(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { - dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_UNMAP); + if (dir != DMA_TO_DEVICE) + dma_cache_maint(handle, size, GNTTAB_CACHE_INVAL); } static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { - dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP); + if (dir == DMA_FROM_DEVICE) + dma_cache_maint(handle, size, GNTTAB_CACHE_INVAL); + else + dma_cache_maint(handle, size, GNTTAB_CACHE_CLEAN); } void __xen_dma_map_page(struct device *hwdev, struct page *page,