From patchwork Tue Feb 22 15:11:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janusz Krzysztofik X-Patchwork-Id: 12755383 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 47A10C433EF for ; Tue, 22 Feb 2022 15:11:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9245A10EA6D; Tue, 22 Feb 2022 15:11:28 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id E647E10EA6D; Tue, 22 Feb 2022 15:11:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645542688; x=1677078688; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=1Rc3tkCzwj+YfO1vaqNZBv7Dt+o0XKyWzuYcH5ibv3Y=; b=MSu9tkT6t3yuaWkGlDvJj5MERx6k7M2j5aU+6zwoEjpCthBe/0Ii7lWN m/I4hC7uPEqLVP/Vb/FodI5EP8iEnWxSoI3bOHXVDssAK96Y5Q0+EcMtl WbO50Y4Ttwgfm98KIHJ31/m2aPAiVgJ3LkFG5ahGigPnEzCNdSEPtqdNE DAUkPkv+XcQ6lxhJWnoSPvZ8BrlqyawQIoIN/2L0q9RURto0pagzV1Vx3 d7RRASdaxOfe5TzqqNtZV+hM9eliRJdqmYvK6iS2wgt+Bzz7bE/g2YIzV wuv6qT0t0rLZvXY6ST6QHUjwEZcbty/pq12YgnKUhseQmwDZ3vJELGVqC A==; X-IronPort-AV: E=McAfee;i="6200,9189,10265"; a="239117626" X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="239117626" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 07:11:27 -0800 X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="683548099" Received: from jkrzyszt-mobl1.ger.corp.intel.com ([10.213.20.194]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 07:11:20 -0800 From: Janusz Krzysztofik To: igt-dev@lists.freedesktop.org Date: Tue, 22 Feb 2022 16:11:00 +0100 Message-Id: <20220222151100.83283-1-janusz.krzysztofik@linux.intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH i-g-t v3] lib/igt_device: Add support for accessing unbound VF PCI devices X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, Chris Wilson Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" The library provides igt_device_get_pci_device() function that allows to get access to a PCI device from an open DRM device file descriptor. It can be used on VF devices as long as a DRM driver is bound to them. However, SR-IOV tests may want to exercise VF PCI devices created by a PF without binding any DRM driver to them. While keeping the API of igt_device_get_pci_device() untouched, extend API of its underlying helper __igt_device_get_pci_device() with an extra argument for specifying VF ID of the requested PCI device and expose this function as public. v2: refresh on top of IGT libpciaccess wrappers and drop previously added but no longer needed error unwind path and recommendations for users on calling pci_system_cleanup() after use (Chris), - fix incorrect validation of snprintf() result and misaligned formatting of igt_warn_on_f() arguments. v3: follow VF numbering convention of Linux PCI ABI (Chris), - fix and improve DOC. Signed-off-by: Janusz Krzysztofik Reviewed-by: Chris Wilson # v2 --- lib/igt_device.c | 33 +++++++++++++++++++++++++++------ lib/igt_device.h | 1 + 2 files changed, 28 insertions(+), 6 deletions(-) diff --git a/lib/igt_device.c b/lib/igt_device.c index c50bf4a1f7..46b7dbc490 100644 --- a/lib/igt_device.c +++ b/lib/igt_device.c @@ -149,9 +149,9 @@ struct igt_pci_addr { unsigned int function; }; -static int igt_device_get_pci_addr(int fd, struct igt_pci_addr *pci) +static int igt_device_get_pci_addr(int fd, int vf_id, struct igt_pci_addr *pci) { - char path[IGT_DEV_PATH_LEN]; + char link[20], path[IGT_DEV_PATH_LEN]; char *buf; int sysfs; int len; @@ -159,11 +159,21 @@ static int igt_device_get_pci_addr(int fd, struct igt_pci_addr *pci) if (!igt_device_is_pci(fd)) return -ENODEV; + if (vf_id < 0) + len = snprintf(link, sizeof(link), "device"); + else + len = snprintf(link, sizeof(link), "device/virtfn%u", vf_id); + if (igt_warn_on_f(len >= sizeof(link), + "IGT bug: insufficient buffer space for rendering PCI device link name\n")) + return -ENOSPC; + else if (igt_debug_on_f(len < 0, "unexpected failure from snprintf()\n")) + return len; + sysfs = igt_sysfs_open(fd); if (sysfs == -1) return -ENOENT; - len = readlinkat(sysfs, "device", path, sizeof(path) - 1); + len = readlinkat(sysfs, link, path, sizeof(path) - 1); close(sysfs); if (len == -1) return -ENOENT; @@ -183,12 +193,23 @@ static int igt_device_get_pci_addr(int fd, struct igt_pci_addr *pci) return 0; } -static struct pci_device *__igt_device_get_pci_device(int fd) +/** + * __igt_device_get_pci_device: + * + * @fd: DRM device file descriptor + * @vf_id: PCI virtual function number or -1 if native or PF itself + * + * Looks up a PCI interface of a DRM device or a VF PCI device of the DRM PF using libpciaccess. + * + * Returns: + * The pci_device, NULL on any failures. + */ +struct pci_device *__igt_device_get_pci_device(int fd, int vf_id) { struct igt_pci_addr pci_addr; struct pci_device *pci_dev; - if (igt_device_get_pci_addr(fd, &pci_addr)) { + if (igt_device_get_pci_addr(fd, vf_id, &pci_addr)) { igt_warn("Unable to find device PCI address\n"); return NULL; } @@ -231,7 +252,7 @@ struct pci_device *igt_device_get_pci_device(int fd) { struct pci_device *pci_dev; - pci_dev = __igt_device_get_pci_device(fd); + pci_dev = __igt_device_get_pci_device(fd, -1); igt_require(pci_dev); return pci_dev; diff --git a/lib/igt_device.h b/lib/igt_device.h index 278ba7a9b3..00da853e71 100644 --- a/lib/igt_device.h +++ b/lib/igt_device.h @@ -33,5 +33,6 @@ void igt_device_drop_master(int fd); int igt_device_get_card_index(int fd); struct pci_device *igt_device_get_pci_device(int fd); +struct pci_device *__igt_device_get_pci_device(int fd, int vf_id); #endif /* __IGT_DEVICE_H__ */