From nobody Mon Feb 9 01:51:14 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 2744FC433F5 for ; Thu, 28 Apr 2022 08:30:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344292AbiD1Idg (ORCPT ); Thu, 28 Apr 2022 04:33:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344219AbiD1IbJ (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 0F37BA0BD2 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 B7E8F1F88D; 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=bFzOYs3GvoZ1bc2idQf8TBLq/Nc4sN1RlI7sPOTyE0I=; b=HNTQdnlj0qCLAqxzw388+FkheIAWG3gwHYAtRFSV9cIoUXwBDo2Iv94Cjlkxh2sI+LNuPe eLFVkOqNjIzUnhB/3qk/P9dSppkkTBWNGhorExasJlN0/U3whVT0HWJbZPavxKrAuaoTbs 4daprI//vTA4Gg5FL9df8FOk1WsMij0= 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 7BA3013491; 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 OLTnHAhQamIBLgAAMHmgww (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 , Oleksandr Andrushchenko , Jaroslav Kysela , Takashi Iwai , alsa-devel@alsa-project.org Subject: [PATCH v2 18/19] xen/sndfront: use xenbus_setup_ring() and xenbus_teardown_ring() Date: Thu, 28 Apr 2022 10:27:42 +0200 Message-Id: <20220428082743.16593-19-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" Simplify sndfront's ring creation and removal via xenbus_setup_ring() and xenbus_teardown_ring(). Signed-off-by: Juergen Gross --- sound/xen/xen_snd_front_evtchnl.c | 44 +++++++------------------------ 1 file changed, 10 insertions(+), 34 deletions(-) diff --git a/sound/xen/xen_snd_front_evtchnl.c b/sound/xen/xen_snd_front_ev= tchnl.c index 3e21369c8216..26d1b3987887 100644 --- a/sound/xen/xen_snd_front_evtchnl.c +++ b/sound/xen/xen_snd_front_evtchnl.c @@ -143,12 +143,12 @@ void xen_snd_front_evtchnl_flush(struct xen_snd_front= _evtchnl *channel) static void evtchnl_free(struct xen_snd_front_info *front_info, struct xen_snd_front_evtchnl *channel) { - unsigned long page =3D 0; + void *page =3D NULL; =20 if (channel->type =3D=3D EVTCHNL_TYPE_REQ) - page =3D (unsigned long)channel->u.req.ring.sring; + page =3D channel->u.req.ring.sring; else if (channel->type =3D=3D EVTCHNL_TYPE_EVT) - page =3D (unsigned long)channel->u.evt.page; + page =3D channel->u.evt.page; =20 if (!page) return; @@ -167,10 +167,7 @@ static void evtchnl_free(struct xen_snd_front_info *fr= ont_info, xenbus_free_evtchn(front_info->xb_dev, channel->port); =20 /* End access and free the page. */ - if (channel->gref !=3D INVALID_GRANT_REF) - gnttab_end_foreign_access(channel->gref, page); - else - free_page(page); + xenbus_teardown_ring(&page, 1, &channel->gref); =20 memset(channel, 0, sizeof(*channel)); } @@ -196,8 +193,7 @@ static int evtchnl_alloc(struct xen_snd_front_info *fro= nt_info, int index, enum xen_snd_front_evtchnl_type type) { struct xenbus_device *xb_dev =3D front_info->xb_dev; - unsigned long page; - grant_ref_t gref; + void *page; irq_handler_t handler; char *handler_name =3D NULL; int ret; @@ -207,12 +203,9 @@ static int evtchnl_alloc(struct xen_snd_front_info *fr= ont_info, int index, channel->index =3D index; channel->front_info =3D front_info; channel->state =3D EVTCHNL_STATE_DISCONNECTED; - channel->gref =3D INVALID_GRANT_REF; - page =3D get_zeroed_page(GFP_KERNEL); - if (!page) { - ret =3D -ENOMEM; + ret =3D xenbus_setup_ring(xb_dev, GFP_KERNEL, &page, 1, &channel->gref); + if (ret) goto fail; - } =20 handler_name =3D kasprintf(GFP_KERNEL, "%s-%s", XENSND_DRIVER_NAME, type =3D=3D EVTCHNL_TYPE_REQ ? @@ -226,33 +219,18 @@ static int evtchnl_alloc(struct xen_snd_front_info *f= ront_info, int index, mutex_init(&channel->ring_io_lock); =20 if (type =3D=3D EVTCHNL_TYPE_REQ) { - struct xen_sndif_sring *sring =3D (struct xen_sndif_sring *)page; + struct xen_sndif_sring *sring =3D page; =20 init_completion(&channel->u.req.completion); mutex_init(&channel->u.req.req_io_lock); - SHARED_RING_INIT(sring); - FRONT_RING_INIT(&channel->u.req.ring, sring, XEN_PAGE_SIZE); - - ret =3D xenbus_grant_ring(xb_dev, sring, 1, &gref); - if (ret < 0) { - channel->u.req.ring.sring =3D NULL; - goto fail; - } + XEN_FRONT_RING_INIT(&channel->u.req.ring, sring, XEN_PAGE_SIZE); =20 handler =3D evtchnl_interrupt_req; } else { - ret =3D gnttab_grant_foreign_access(xb_dev->otherend_id, - virt_to_gfn((void *)page), 0); - if (ret < 0) - goto fail; - - channel->u.evt.page =3D (struct xensnd_event_page *)page; - gref =3D ret; + channel->u.evt.page =3D page; handler =3D evtchnl_interrupt_evt; } =20 - channel->gref =3D gref; - ret =3D xenbus_alloc_evtchn(xb_dev, &channel->port); if (ret < 0) goto fail; @@ -279,8 +257,6 @@ static int evtchnl_alloc(struct xen_snd_front_info *fro= nt_info, int index, return 0; =20 fail: - if (page) - free_page(page); kfree(handler_name); dev_err(&xb_dev->dev, "Failed to allocate ring: %d\n", ret); return ret; --=20 2.34.1