From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 264ED37B41A for ; Fri, 8 May 2026 19:23:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778268222; cv=none; b=UwbppDARdQNAPl6sqfQzcatcov3jNk6L12EBKKPix03xIE/mZXun2EKMKig7O/a4gyYloYQrl5JvAGejWsFzdZMdVCYTj9p1SW6CLcv8B4lQkiiR6HDsm9xcjSKrq3lI2zzOd28MVo3BM9EGXINZY3NDsDHufPHDb8eBbexyU1A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778268222; c=relaxed/simple; bh=Ui6v7ZYYV108+i/doDDUhMIYyfstgEMqKZnw483GfBo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jW4gFa2dG4CeOPpIQf3zb7hWeq+q1EpzpL0LNhmUbbG8ty1ImItTL9+7RUPqvCLf0Hxlb4vl09dfJgZtEZF4eT3kOWCdfvGeDK++pdhlRNNFwiSSXtf6xWTFa/xaah+4LiPMil9wBhEcsluLkQRt+2WsSbgT+MJY2TO388mAkQI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ye+pBlBx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ye+pBlBx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69815C2BCB0; Fri, 8 May 2026 19:23:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778268222; bh=Ui6v7ZYYV108+i/doDDUhMIYyfstgEMqKZnw483GfBo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Ye+pBlBxEj91+llTIqxOK1CVYiVnTLJdusqHOEv2aX/jLyjSiVqmuJrPUdlsie+at iLzMxoOMZ1t2wfyz/3uF5RglZKTO+D8/70RHKpQeRZzb8jJtrN4VwypSyhAq7mKDfY aNDBks2f4CcDv5Hus7akkFRhdLP8rwDcyGV1scLQndhFQtngTFHKznrKhMnWO4rNTC nKaQzRccBx7437k4AaT8+RZtMyhlu4SibZSYhyanvtAE0L8asMy+GZ4YXapJuMoisB iQb7Zx2eS6xA+Tfd7pxb4TfygFDswUILVoSri9hxVsTsgcE1atSt+SP04/nVFiT8cp +1RZIE4DV1w/w== Date: Fri, 8 May 2026 21:23:36 +0200 From: Niklas Cassel To: John Garry Cc: Tommy Kelly , Damien Le Moal , Tejun Heo , "Martin K. Petersen" , linux-ide@vger.kernel.org, hare@suse.de Subject: Re: [PATCH 0/3] ata: fix deferred QC handling for port multipliers Message-ID: References: <20260501125410.1204490-5-cassel@kernel.org> <4be77745-2b7d-416c-b01a-88669d9bbeb8@oracle.com> <0f4458e2-cdb3-463b-a25c-5b2147e4e442@oracle.com> Precedence: bulk X-Mailing-List: linux-ide@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0f4458e2-cdb3-463b-a25c-5b2147e4e442@oracle.com> Hello John, On Mon, May 04, 2026 at 08:27:06AM +0100, John Garry wrote: > On 01/05/2026 19:42, Niklas Cassel wrote: > > On Fri, May 01, 2026 at 03:19:03PM +0100, John Garry wrote: > > > On 01/05/2026 13:54, Niklas Cassel wrote: > > > > > > As I understand, this deferred QC scheme was intended to solve starvation > > > problems for multiqueue SAS HBAs (using libsas-based drivers). libsas has no > > > port multiplier support, so I wonder why we make deferred QC scheme work for > > > port multiplier, i.e. non-libsas scenario. > > > > Are you certain that there are no libsas HBAs that support port > > multipliers? > > No, I am just saying that libsas does not support port multipliers, see > earlier effort @ https://lore.kernel.org/linux-scsi/1398346023-10225-1-git-send-email-yxlraid@gmail.com/ > > See this today: > > int sas_discover_sata(struct domain_device *dev) > { > if (dev->dev_type == SAS_SATA_PM) > return -ENODEV; > I see, thank you for the information! Will send a V2 soon. Kind regards, Niklas