From mboxrd@z Thu Jan 1 00:00:00 1970 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 90C55C38A2D for ; Thu, 27 Oct 2022 01:35:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233701AbiJ0BfL (ORCPT ); Wed, 26 Oct 2022 21:35:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233628AbiJ0BfI (ORCPT ); Wed, 26 Oct 2022 21:35:08 -0400 Received: from esa1.hgst.iphmx.com (esa1.hgst.iphmx.com [68.232.141.245]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77D2328E0F for ; Wed, 26 Oct 2022 18:34:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1666834493; x=1698370493; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=Mfvs68MMxP21OfOV+MNKT20Qml7kPOHQBwE5n8aakKc=; b=mriBwUf/3HaqgX4O6pdGp5HdC+JdKwZREChsb0UBS2H8tn8Ra43KrN6C /afKKUvUmNNhBRiWXPjJotCDv7zf84pC5by446SfVDXDEMI/1AaW5sUB2 JxDj6tIw1Y5T0i5e/VxdlSQLKkv54F5NrOEe/ZFkRq8yu9TfOWqzLB6SN PBSGKVWMhBYHb8Q66yF/qdRvHMFI/P+OBY/hHamEC+n7erT37wSIg70fE fAHNyUFS0mIpfiwTa1Qi6bQxbM/2XT3xchYqLh16xDJ7oUj5Z4PeYkuie lWDPPDOVKa+Su0OZ7BfmMdx6PDgLLF4cC75TfH9/GIeUmTbhpF4dukCnC Q==; X-IronPort-AV: E=Sophos;i="5.95,215,1661788800"; d="scan'208";a="326938345" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 27 Oct 2022 09:34:52 +0800 IronPort-SDR: OdSvijmV33h4TOX4enek84RAUTHTtxQ/whFzK88ZxzKBVcJ6L8b5Sk7+gqtQ4tI6Fbkt2dKrV8 gdEtSrtPLTAv1cfZdiNpUEpDGAvNWwMp1Flr1hm5fXMFJ6KOAwk6GBdUCXLCwMxTy7tg7VJr7o iVt2BIjlPOcaOcLLDIkJwWpOe6IPVFXZTtiLSwcEkBcT56i3zsbRoZfxncDdUIwvzXBm4KzAyo KiTbB/iV9UpQKCCTWvPxoxYD1VoUEqrGv9xCJfHjof1ETQc+mRiPhi/r2vB7C+5ZYTCcQiOY21 m6TcpASGNQyWW7mYXBqYYrUA Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 26 Oct 2022 17:54:12 -0700 IronPort-SDR: Qt1WDEBaCCdzytJ+AlAvcjRJ3hiyelqhX5kD5KMnpCQ806+2ZOqA19aw5MUkdQ6yASD1e/LhX8 RhoU6tsVxYMuKMyYdijr1HetfaAuXtTgg/f0i1CBk9ADGl6GC0SjT/QcYbIqugviP3KH1xaX5g DeJXMFhBXBTsTCeDdIRRmff1wKPrG3wFiLi2+vNldBDF+CEONKui+fmZZ/yunI4zGQdLuXO8dz +82Yg7l1d3XAQoW72/5ptUpO/xQh9P+zCb9Wl2yhbbTN8eO/SZ60r3hY+QgXeFPUrAMfNpAyOq piM= WDCIronportException: Internal Received: from usg-ed-osssrv.wdc.com ([10.3.10.180]) by uls-op-cesaip02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 26 Oct 2022 18:34:51 -0700 Received: from usg-ed-osssrv.wdc.com (usg-ed-osssrv.wdc.com [127.0.0.1]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTP id 4MySsN6kMyz1RwvL for ; Wed, 26 Oct 2022 18:34:48 -0700 (PDT) Authentication-Results: usg-ed-osssrv.wdc.com (amavisd-new); dkim=pass reason="pass (just generated, assumed good)" header.d=opensource.wdc.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d= opensource.wdc.com; h=content-transfer-encoding:content-type :in-reply-to:organization:from:references:to:content-language :subject:user-agent:mime-version:date:message-id; s=dkim; t= 1666834487; x=1669426488; bh=Mfvs68MMxP21OfOV+MNKT20Qml7kPOHQBwE 5n8aakKc=; b=NJa8xT5UzqO5+O30ifNYx3LY4Jt7KdV/eDg25EZRBy0mgXCqHi5 oFxp66raECNTbrvQtzrHYSrM5oOrNC1Pz9tuluAu/1UU4F68oBs5cVi76vBydr7x +wIBs0gfPwngDiBpLzzyhOduehzRrGYI/VZDe+mUHROFGKWI2iFXU3ZUaUcjco+k fq6tVSlvZcVtG/P4E+obckSYjJXGvXBVxXD1lldssoMjsMQCzJGzEyGV43E8z27C GU5JXqNBAtuwwNo0b8h4Jd4Y5MJ13fJn1oPaRVROfMLhfJx4ezPwEGTvStIxOxl7 9JziKPSZyyfqNa+9/h1QTOgED3pO3s/0GkA== X-Virus-Scanned: amavisd-new at usg-ed-osssrv.wdc.com Received: from usg-ed-osssrv.wdc.com ([127.0.0.1]) by usg-ed-osssrv.wdc.com (usg-ed-osssrv.wdc.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id d8aB6_uWl1EF for ; Wed, 26 Oct 2022 18:34:47 -0700 (PDT) Received: from [10.149.53.254] (washi.fujisawa.hgst.com [10.149.53.254]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTPSA id 4MySsK2k8Kz1RvLy; Wed, 26 Oct 2022 18:34:45 -0700 (PDT) Message-ID: <6c0a4a75-786a-c946-57f2-c511bd765bcc@opensource.wdc.com> Date: Thu, 27 Oct 2022 10:34:43 +0900 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0 Subject: Re: [PATCH RFC v3 16/22] ata: libata-scsi: Allocate sdev early in port probe Content-Language: en-US To: John Garry , axboe@kernel.dk, jejb@linux.ibm.com, martin.petersen@oracle.com, jinpu.wang@cloud.ionos.com, hare@suse.de, bvanassche@acm.org, hch@lst.de, ming.lei@redhat.com, niklas.cassel@wdc.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linuxarm@huawei.com References: <1666693096-180008-1-git-send-email-john.garry@huawei.com> <1666693096-180008-17-git-send-email-john.garry@huawei.com> From: Damien Le Moal Organization: Western Digital Research In-Reply-To: <1666693096-180008-17-git-send-email-john.garry@huawei.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org On 10/25/22 19:18, John Garry wrote: > Currently the per-ata device sdev is allocated as part of the scsi target > scan, which is after the ata port probe. > > However it is useful to have the sdev available in the port probe. As an > example of an advantage, if the request queue is available in the probe > (which it would be if the sdev is available), then it is possible to use > a SCSI cmnd for ATA internal commands. The benefit of this is then we can > put the ATA qc structure in the SCSI cmnd private data. It will also be > useful if we want to send ATA internal commands as requests. > > Export scsi_target_reap() so that it can be used to put the extra > reference we get when allocating the sdev. > > Signed-off-by: John Garry > --- > drivers/ata/libata-eh.c | 1 + > drivers/ata/libata-scsi.c | 23 +++++++++-------------- > drivers/scsi/scsi_scan.c | 1 + > 3 files changed, 11 insertions(+), 14 deletions(-) > > diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c > index 08e11bc312c2..1ed5b1b64792 100644 > --- a/drivers/ata/libata-eh.c > +++ b/drivers/ata/libata-eh.c > @@ -3446,6 +3446,7 @@ static int ata_eh_schedule_probe(struct ata_device *dev) > > ata_eh_detach_dev(dev); > ata_dev_init(dev); > + ata_scsi_setup_sdev(dev); > ehc->did_probe_mask |= (1 << dev->devno); > ehc->i.action |= ATA_EH_RESET; > ehc->saved_xfer_mode[dev->devno] = 0; > diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c > index efdba852e363..476e0ef4bd29 100644 > --- a/drivers/ata/libata-scsi.c > +++ b/drivers/ata/libata-scsi.c > @@ -1109,7 +1109,12 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev) > if (dev->flags & ATA_DFLAG_TRUSTED) > sdev->security_supported = 1; > > - dev->sdev = sdev; > + /* > + * Put extra reference which we get when allocating the starget > + * initially > + */ > + scsi_target_reap(scsi_target(sdev)); > + > return 0; > } > > @@ -4289,26 +4294,16 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync) > repeat: > ata_for_each_link(link, ap, EDGE) { > ata_for_each_dev(dev, link, ENABLED) { > - struct scsi_device *sdev; > + struct Scsi_Host *shost = ap->scsi_host; > int channel = 0, id = 0; > > - if (dev->sdev) > - continue; > - > if (ata_is_host_link(link)) > id = dev->devno; > else > channel = link->pmp; > > - sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, > - NULL); > - if (!IS_ERR(sdev)) { > - dev->sdev = sdev; > - ata_scsi_assign_ofnode(dev, ap); Is there something equivalent to what this function does inside scsi_scan_target() ? I had a quick look but did not see anything... > - scsi_device_put(sdev); > - } else { > - dev->sdev = NULL; > - } > + scsi_scan_target(&shost->shost_gendev, channel, id, > + 0, SCSI_SCAN_INITIAL); > } > } > > diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c > index b795c138f2c1..da7bc14b030c 100644 > --- a/drivers/scsi/scsi_scan.c > +++ b/drivers/scsi/scsi_scan.c > @@ -598,6 +598,7 @@ void scsi_target_reap(struct scsi_target *starget) > BUG_ON(starget->state == STARGET_DEL); > scsi_target_reap_ref_put(starget); > } > +EXPORT_SYMBOL_GPL(scsi_target_reap); > > /** > * scsi_sanitize_inquiry_string - remove non-graphical chars from an -- Damien Le Moal Western Digital Research