From patchwork Tue Nov 24 08:01:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 11927355 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BFEB9C63777 for ; Tue, 24 Nov 2020 08:02:27 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4F470206D9 for ; Tue, 24 Nov 2020 08:02:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=xen.org header.i=@xen.org header.b="ksbbyxp2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4F470206D9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=xen.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.35434.67038 (Exim 4.92) (envelope-from ) id 1khTH7-0008Hz-My; Tue, 24 Nov 2020 08:02:09 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 35434.67038; Tue, 24 Nov 2020 08:02:09 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khTH7-0008HE-1E; Tue, 24 Nov 2020 08:02:09 +0000 Received: by outflank-mailman (input) for mailman id 35434; Tue, 24 Nov 2020 08:02:05 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khTH3-00088d-7t for xen-devel@lists.xenproject.org; Tue, 24 Nov 2020 08:02:05 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khTH2-00060j-Ek; Tue, 24 Nov 2020 08:02:04 +0000 Received: from ec2-54-145-241-208.compute-1.amazonaws.com ([54.145.241.208] helo=ip-10-0-29-170.ec2.internal) by xenbits.xenproject.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1khTH2-0001hp-Bz; Tue, 24 Nov 2020 08:02:04 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khTH3-00088d-7t for xen-devel@lists.xenproject.org; Tue, 24 Nov 2020 08:02:05 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=EIPA9+ZEASvzq7mL3kgJN1+orOrgFwgTrTG56YTc2Qo=; b=ksbbyxp2eUVo6dIEVKb++3Fod pzpE9qQoTF6+VpIOx21zQRoYWTzEQ+BDB0BuUkG7wgLeiLJgJzPmh+3Zz6SqScH4Vma++NSESNPH0 lMcFrpXJLmgigfDKDDkNc8pKEDDQQTE3J8yaRaNThH1dPEK7n9VOviQ1Li2fA7gOUDD20=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1khTH2-00060j-Ek; Tue, 24 Nov 2020 08:02:04 +0000 Received: from ec2-54-145-241-208.compute-1.amazonaws.com ([54.145.241.208] helo=ip-10-0-29-170.ec2.internal) by xenbits.xenproject.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1khTH2-0001hp-Bz; Tue, 24 Nov 2020 08:02:04 +0000 From: Paul Durrant To: xen-devel@lists.xenproject.org Cc: Paul Durrant , Ian Jackson , Wei Liu Subject: [PATCH v4 08/23] libxl: generalise 'driver_path' xenstore access functions in libxl_pci.c Date: Tue, 24 Nov 2020 08:01:44 +0000 Message-Id: <20201124080159.11912-9-paul@xen.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20201124080159.11912-1-paul@xen.org> References: <20201124080159.11912-1-paul@xen.org> From: Paul Durrant For the purposes of re-binding a device to its previous driver libxl__device_pci_assignable_add() writes the driver path into xenstore. This path is then read back in libxl__device_pci_assignable_remove(). The functions that support this writing to and reading from xenstore are currently dedicated for this purpose and hence the node name 'driver_path' is hard-coded. This patch generalizes these utility functions and passes 'driver_path' as an argument. Subsequent patches will invoke them to access other nodes. NOTE: Because functions will have a broader use (other than storing a driver path in lieu of pciback) the base xenstore path is also changed from '/libxl/pciback' to '/libxl/pci'. Signed-off-by: Paul Durrant Reviewed-by: Oleksandr Andrushchenko --- Cc: Ian Jackson Cc: Wei Liu --- tools/libs/light/libxl_pci.c | 66 +++++++++++++++++++++----------------------- 1 file changed, 32 insertions(+), 34 deletions(-) diff --git a/tools/libs/light/libxl_pci.c b/tools/libs/light/libxl_pci.c index 77edd27345..a5d5d2e78b 100644 --- a/tools/libs/light/libxl_pci.c +++ b/tools/libs/light/libxl_pci.c @@ -737,48 +737,46 @@ static int pciback_dev_unassign(libxl__gc *gc, libxl_device_pci *pci) return 0; } -#define PCIBACK_INFO_PATH "/libxl/pciback" +#define PCI_INFO_PATH "/libxl/pci" -static void pci_assignable_driver_path_write(libxl__gc *gc, - libxl_device_pci *pci, - char *driver_path) +static char *pci_info_xs_path(libxl__gc *gc, libxl_device_pci *pci, + const char *node) { - char *path; + return node ? + GCSPRINTF(PCI_INFO_PATH"/"PCI_BDF_XSPATH"/%s", + pci->domain, pci->bus, pci->dev, pci->func, + node) : + GCSPRINTF(PCI_INFO_PATH"/"PCI_BDF_XSPATH, + pci->domain, pci->bus, pci->dev, pci->func); +} + + +static void pci_info_xs_write(libxl__gc *gc, libxl_device_pci *pci, + const char *node, const char *val) +{ + char *path = pci_info_xs_path(gc, pci, node); - path = GCSPRINTF(PCIBACK_INFO_PATH"/"PCI_BDF_XSPATH"/driver_path", - pci->domain, - pci->bus, - pci->dev, - pci->func); - if ( libxl__xs_printf(gc, XBT_NULL, path, "%s", driver_path) < 0 ) { - LOGE(WARN, "Write of %s to node %s failed.", driver_path, path); + if ( libxl__xs_printf(gc, XBT_NULL, path, "%s", val) < 0 ) { + LOGE(WARN, "Write of %s to node %s failed.", val, path); } } -static char * pci_assignable_driver_path_read(libxl__gc *gc, - libxl_device_pci *pci) +static char *pci_info_xs_read(libxl__gc *gc, libxl_device_pci *pci, + const char *node) { - return libxl__xs_read(gc, XBT_NULL, - GCSPRINTF( - PCIBACK_INFO_PATH "/" PCI_BDF_XSPATH "/driver_path", - pci->domain, - pci->bus, - pci->dev, - pci->func)); + char *path = pci_info_xs_path(gc, pci, node); + + return libxl__xs_read(gc, XBT_NULL, path); } -static void pci_assignable_driver_path_remove(libxl__gc *gc, - libxl_device_pci *pci) +static void pci_info_xs_remove(libxl__gc *gc, libxl_device_pci *pci, + const char *node) { + char *path = pci_info_xs_path(gc, pci, node); libxl_ctx *ctx = libxl__gc_owner(gc); /* Remove the xenstore entry */ - xs_rm(ctx->xsh, XBT_NULL, - GCSPRINTF(PCIBACK_INFO_PATH "/" PCI_BDF_XSPATH, - pci->domain, - pci->bus, - pci->dev, - pci->func) ); + xs_rm(ctx->xsh, XBT_NULL, path); } static int libxl__device_pci_assignable_add(libxl__gc *gc, @@ -824,9 +822,9 @@ static int libxl__device_pci_assignable_add(libxl__gc *gc, /* Store driver_path for rebinding to dom0 */ if ( rebind ) { if ( driver_path ) { - pci_assignable_driver_path_write(gc, pci, driver_path); + pci_info_xs_write(gc, pci, "driver_path", driver_path); } else if ( (driver_path = - pci_assignable_driver_path_read(gc, pci)) != NULL ) { + pci_info_xs_read(gc, pci, "driver_path")) != NULL ) { LOG(INFO, PCI_BDF" not bound to a driver, will be rebound to %s", dom, bus, dev, func, driver_path); } else { @@ -834,7 +832,7 @@ static int libxl__device_pci_assignable_add(libxl__gc *gc, dom, bus, dev, func); } } else { - pci_assignable_driver_path_remove(gc, pci); + pci_info_xs_remove(gc, pci, "driver_path"); } if ( pciback_dev_assign(gc, pci) ) { @@ -884,7 +882,7 @@ static int libxl__device_pci_assignable_remove(libxl__gc *gc, } /* Rebind if necessary */ - driver_path = pci_assignable_driver_path_read(gc, pci); + driver_path = pci_info_xs_read(gc, pci, "driver_path"); if ( driver_path ) { if ( rebind ) { @@ -897,7 +895,7 @@ static int libxl__device_pci_assignable_remove(libxl__gc *gc, return -1; } - pci_assignable_driver_path_remove(gc, pci); + pci_info_xs_remove(gc, pci, "driver_path"); } } else { if ( rebind ) {