From nobody Mon Feb 9 16:12:59 2026 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1559120732; cv=none; d=zoho.com; s=zohoarc; b=nfbwCvASmQyL94SEZrapxvOK36WtAFiC2ahOUvA5wH2zaSt8Zv8bHY0CwPy5am/cbZlmSEj2kcHDgW4gfIYdXbmBxPbM5+cjqe2VXz1i2xiNnBlNVdZIxNj53MSXTgu/d2R82gNl0n3QmQAISAypm6pxc9W9CAApxW9YJrpqAFQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1559120732; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=Avzynv++gUvwCZmCFLDOIPIm09zwU/v8eMNS1I/0M0Q=; b=Vkji8ZedjhyqesGiGRDlnPpFbh7n3AZULfD/cHztQD+bemDa7JRqrWw333gZAkGCD9kxh7Nce6h3+nlLFv3evB8UgULhW1sYujZH/baliaL/kkkOvku5wy9hceWizf8xZxNGLcXkabOot4gBXV/pSL+mopuc6QrAuQMKkW6656g= ARC-Authentication-Results: i=1; mx.zoho.com; spf=none (zoho.com: 192.237.175.120 is neither permitted nor denied by domain of lists.xenproject.org) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 155912073270153.59399006390561; Wed, 29 May 2019 02:05:32 -0700 (PDT) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hVuVK-0005VM-Tt; Wed, 29 May 2019 09:04:14 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hVuVK-0005V2-0x for xen-devel@lists.xenproject.org; Wed, 29 May 2019 09:04:14 +0000 Received: from mx1.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id b95a4dbe-81f0-11e9-96a8-1b39861a9cfc; Wed, 29 May 2019 09:04:11 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 0AFA7AEFD; Wed, 29 May 2019 09:04:11 +0000 (UTC) X-Inumbo-ID: b95a4dbe-81f0-11e9-96a8-1b39861a9cfc X-Virus-Scanned: by amavisd-new at test-mx.suse.de From: Juergen Gross To: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Date: Wed, 29 May 2019 11:04:07 +0200 Message-Id: <20190529090407.1225-4-jgross@suse.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20190529090407.1225-1-jgross@suse.com> References: <20190529090407.1225-1-jgross@suse.com> Subject: [Xen-devel] [PATCH v2 3/3] xen/swiotlb: remember having called xen_create_contiguous_region() 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: Juergen Gross , xen-devel@lists.xenproject.org, Boris Ostrovsky , Stefano Stabellini , Konrad Rzeszutek Wilk MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Instead of always calling xen_destroy_contiguous_region() in case the memory is DMA-able for the used device, do so only in case it has been made DMA-able via xen_create_contiguous_region() before. This will avoid a lot of xen_destroy_contiguous_region() calls for 64-bit capable devices. As the memory in question is owned by swiotlb-xen the PG_owner_priv_1 flag of the first allocated page can be used for remembering. Signed-off-by: Juergen Gross --- V2: add PG_xen_remapped alias for PG_owner_priv_1 (Boris Ostrovsky) only clear page flag in case of sane conditions (Jan Beulich) --- drivers/xen/swiotlb-xen.c | 6 +++++- include/linux/page-flags.h | 3 +++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index aba5247b9145..7e2d9d1b6f63 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -321,6 +321,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t= size, xen_free_coherent_pages(hwdev, size, ret, (dma_addr_t)phys, attrs); return NULL; } + SetPageXenRemapped(virt_to_page(ret)); } memset(ret, 0, size); return ret; @@ -345,8 +346,11 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t= size, void *vaddr, size =3D 1UL << (order + XEN_PAGE_SHIFT); =20 if (!WARN_ON((dev_addr + size - 1 > dma_mask) || - range_straddles_page_boundary(phys, size))) + range_straddles_page_boundary(phys, size)) && + PageXenRemapped(virt_to_page(vaddr))) { xen_destroy_contiguous_region(phys, order); + ClearPageXenRemapped(virt_to_page(vaddr)); + } =20 xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs); } diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 9f8712a4b1a5..296480e990f2 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -152,6 +152,8 @@ enum pageflags { PG_savepinned =3D PG_dirty, /* Has a grant mapping of another (foreign) domain's page. */ PG_foreign =3D PG_owner_priv_1, + /* Remapped by swiotlb-xen. */ + PG_xen_remapped =3D PG_owner_priv_1, =20 /* SLOB */ PG_slob_free =3D PG_private, @@ -329,6 +331,7 @@ PAGEFLAG(Pinned, pinned, PF_NO_COMPOUND) TESTSCFLAG(Pinned, pinned, PF_NO_COMPOUND) PAGEFLAG(SavePinned, savepinned, PF_NO_COMPOUND); PAGEFLAG(Foreign, foreign, PF_NO_COMPOUND); +PAGEFLAG(XenRemapped, xen_remapped, PF_NO_COMPOUND); =20 PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) __CLEARPAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) --=20 2.16.4 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel