From nobody Sun Feb 8 23:19:24 2026 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 493B1C433F5 for ; Thu, 28 Apr 2022 08:30:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344443AbiD1IdV (ORCPT ); Thu, 28 Apr 2022 04:33:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344216AbiD1IbJ (ORCPT ); Thu, 28 Apr 2022 04:31:09 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53084A0BD6 for ; Thu, 28 Apr 2022 01:27:54 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id EF2F21F88E; Thu, 28 Apr 2022 08:27:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1651134472; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DySE+lWBPx7VwNEF3X1lwYDq+4S10O0jUUqyaBArCE0=; b=nbgsI2l8XvMPHhwykxKcjmjFm5ic18dsQ4iNKTc8cOED/bFxCbEf3NTRN8JBCmnMBKGyQ2 qXLhAX68u5bD4eceSKKH1djjOsiFninHCccZsIkSwMsZEy1jxCtv8Ps2onc8BrAtqKGNng Yy+egfDuGQZXpsqZG2QPjJvI84+Pz7Q= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id C01E513491; Thu, 28 Apr 2022 08:27:52 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id mIuaLQhQamIBLgAAMHmgww (envelope-from ); Thu, 28 Apr 2022 08:27:52 +0000 From: Juergen Gross To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: Juergen Gross , Boris Ostrovsky , Stefano Stabellini Subject: [PATCH v2 19/19] xen/xenbus: eliminate xenbus_grant_ring() Date: Thu, 28 Apr 2022 10:27:43 +0200 Message-Id: <20220428082743.16593-20-jgross@suse.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220428082743.16593-1-jgross@suse.com> References: <20220428082743.16593-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" There is no external user of xenbus_grant_ring() left, so merge it into the only caller xenbus_setup_ring(). Signed-off-by: Juergen Gross Reviewed-by: Oleksandr Tyshchenko --- V2: - make error message more precise (Andrew Cooper) --- drivers/xen/xenbus/xenbus_client.c | 65 +++++++++--------------------- include/xen/xenbus.h | 2 - 2 files changed, 19 insertions(+), 48 deletions(-) diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus= _client.c index 1a2e0d94ccd1..d6fdd2d209d3 100644 --- a/drivers/xen/xenbus/xenbus_client.c +++ b/drivers/xen/xenbus/xenbus_client.c @@ -363,50 +363,6 @@ static void xenbus_switch_fatal(struct xenbus_device *= dev, int depth, int err, __xenbus_switch_state(dev, XenbusStateClosing, 1); } =20 -/** - * xenbus_grant_ring - * @dev: xenbus device - * @vaddr: starting virtual address of the ring - * @nr_pages: number of pages to be granted - * @grefs: grant reference array to be filled in - * - * Grant access to the given @vaddr to the peer of the given device. - * Then fill in @grefs with grant references. Return 0 on success, or - * -errno on error. On error, the device will switch to - * XenbusStateClosing, and the error will be saved in the store. - */ -int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr, - unsigned int nr_pages, grant_ref_t *grefs) -{ - int err; - unsigned int i; - grant_ref_t gref_head; - - err =3D gnttab_alloc_grant_references(nr_pages, &gref_head); - if (err) { - xenbus_dev_fatal(dev, err, "granting access to ring page"); - return err; - } - - for (i =3D 0; i < nr_pages; i++) { - unsigned long gfn; - - if (is_vmalloc_addr(vaddr)) - gfn =3D pfn_to_gfn(vmalloc_to_pfn(vaddr)); - else - gfn =3D virt_to_gfn(vaddr); - - grefs[i] =3D gnttab_claim_grant_reference(&gref_head); - gnttab_grant_foreign_access_ref(grefs[i], dev->otherend_id, - gfn, 0); - - vaddr =3D vaddr + XEN_PAGE_SIZE; - } - - return 0; -} -EXPORT_SYMBOL_GPL(xenbus_grant_ring); - /* * xenbus_setup_ring * @dev: xenbus device @@ -424,6 +380,7 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t = gfp, void **vaddr, unsigned int nr_pages, grant_ref_t *grefs) { unsigned long ring_size =3D nr_pages * XEN_PAGE_SIZE; + grant_ref_t gref_head; unsigned int i; int ret; =20 @@ -433,9 +390,25 @@ int xenbus_setup_ring(struct xenbus_device *dev, gfp_t= gfp, void **vaddr, goto err; } =20 - ret =3D xenbus_grant_ring(dev, *vaddr, nr_pages, grefs); - if (ret) + ret =3D gnttab_alloc_grant_references(nr_pages, &gref_head); + if (ret) { + xenbus_dev_fatal(dev, ret, "granting access to %u ring pages", + nr_pages); goto err; + } + + for (i =3D 0; i < nr_pages; i++) { + unsigned long gfn; + + if (is_vmalloc_addr(*vaddr)) + gfn =3D pfn_to_gfn(vmalloc_to_pfn(vaddr[i])); + else + gfn =3D virt_to_gfn(vaddr[i]); + + grefs[i] =3D gnttab_claim_grant_reference(&gref_head); + gnttab_grant_foreign_access_ref(grefs[i], dev->otherend_id, + gfn, 0); + } =20 return 0; =20 diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index b533b4adc835..eaa932b99d8a 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -224,8 +224,6 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev, str= uct xenbus_watch *watch, const char *pathfmt, ...); =20 int xenbus_switch_state(struct xenbus_device *dev, enum xenbus_state new_s= tate); -int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr, - unsigned int nr_pages, grant_ref_t *grefs); int xenbus_setup_ring(struct xenbus_device *dev, gfp_t gfp, void **vaddr, unsigned int nr_pages, grant_ref_t *grefs); void xenbus_teardown_ring(void **vaddr, unsigned int nr_pages, --=20 2.34.1