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 52737C64EC4 for ; Fri, 10 Mar 2023 14:26:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232390AbjCJO0W (ORCPT ); Fri, 10 Mar 2023 09:26:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232149AbjCJOZs (ORCPT ); Fri, 10 Mar 2023 09:25:48 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C731E487B for ; Fri, 10 Mar 2023 06:24:45 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id A02C2CE28FE for ; Fri, 10 Mar 2023 14:24:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E961C433D2; Fri, 10 Mar 2023 14:24:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678458282; bh=XtRTcAba1WgPLgsnqtuOtGTHfzwm60mxyvNTS9Do5a8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rjL5ysaQyzrUX8gPYOJNvNmg1Fnx0uqdKlYZXRRsfKBxBdzJ0FXXNIBqH1jKNqbey GP8mgwRXwIpj66hdskLi21uutMqs/N+ZGY8hfWzuRKfYqT75L6Ydj17wt9IVi2tUwC fGb28XfqcxOn85WjHogfPDwVQ4yqFVETBv467SsA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Niklas Cassel , Damien Le Moal , Bjorn Helgaas Subject: [PATCH 4.19 193/252] PCI: Avoid FLR for AMD FCH AHCI adapters Date: Fri, 10 Mar 2023 14:39:23 +0100 Message-Id: <20230310133724.813874642@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.803482157@linuxfoundation.org> References: <20230310133718.803482157@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Damien Le Moal commit 63ba51db24ed1b8f8088a897290eb6c036c5435d upstream. PCI passthrough to VMs does not work with AMD FCH AHCI adapters: the guest OS fails to correctly probe devices attached to the controller due to FIS communication failures: ata4: softreset failed (1st FIS failed) ... ata4.00: qc timeout after 5000 msecs (cmd 0xec) ata4.00: failed to IDENTIFY (I/O error, err_mask=0x4) Forcing the "bus" reset method before unbinding & binding the adapter to the vfio-pci driver solves this issue, e.g.: echo "bus" > /sys/bus/pci/devices//reset_method gives a working guest OS, indicating that the default FLR reset method doesn't work correctly. Apply quirk_no_flr() to AMD FCH AHCI devices to work around this issue. Link: https://lore.kernel.org/r/20230128013951.523247-1-damien.lemoal@opensource.wdc.com Reported-by: Niklas Cassel Signed-off-by: Damien Le Moal Signed-off-by: Bjorn Helgaas Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/pci/quirks.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -5153,6 +5153,7 @@ static void quirk_no_flr(struct pci_dev DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1487, quirk_no_flr); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x148c, quirk_no_flr); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x149c, quirk_no_flr); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x7901, quirk_no_flr); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1502, quirk_no_flr); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1503, quirk_no_flr);