From patchwork Tue Nov 24 13:35:21 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lan Tianyu X-Patchwork-Id: 548080 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 30116140313 for ; Wed, 25 Nov 2015 00:51:34 +1100 (AEDT) Received: from localhost ([::1]:38614 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1E0K-0001Ev-AK for incoming@patchwork.ozlabs.org; Tue, 24 Nov 2015 08:51:32 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34114) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1Dzh-0000I6-RT for qemu-devel@nongnu.org; Tue, 24 Nov 2015 08:50:54 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a1Dze-0001bw-Jr for qemu-devel@nongnu.org; Tue, 24 Nov 2015 08:50:53 -0500 Received: from mga02.intel.com ([134.134.136.20]:54513) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1Dze-0001bq-CH for qemu-devel@nongnu.org; Tue, 24 Nov 2015 08:50:50 -0500 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP; 24 Nov 2015 05:50:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,338,1444719600"; d="scan'208";a="606320221" Received: from lantianyu-ws.sh.intel.com (HELO localhost) ([10.239.159.159]) by FMSMGA003.fm.intel.com with ESMTP; 24 Nov 2015 05:50:46 -0800 From: Lan Tianyu To: aik@ozlabs.ru, alex.williamson@redhat.com, amit.shah@redhat.com, anthony@codemonkey.ws, ard.biesheuvel@linaro.org, blauwirbel@gmail.com, cornelia.huck@de.ibm.com, eddie.dong@intel.com, nrupal.jani@intel.com, agraf@suse.de, kvm@vger.kernel.org, pbonzini@redhat.com, qemu-devel@nongnu.org, emil.s.tantilov@intel.com, gerlitz.or@gmail.com, donald.c.skidmore@intel.com, mark.d.rustad@intel.com, mst@redhat.com, kraxel@redhat.com, lcapitulino@redhat.com, quintela@redhat.com Date: Tue, 24 Nov 2015 21:35:21 +0800 Message-Id: <1448372127-28115-5-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1448372127-28115-1-git-send-email-tianyu.lan@intel.com> References: <1448372127-28115-1-git-send-email-tianyu.lan@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.20 Cc: Lan Tianyu Subject: [Qemu-devel] [RFC PATCH V2 04/10] Qemu/VFIO: Add vfio_find_free_cfg_reg() to find free PCI config space regs X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This patch is to add ioctl wrap to find free PCI config sapce regs. Signed-off-by: Lan Tianyu --- hw/vfio/pci.c | 19 +++++++++++++++++++ hw/vfio/pci.h | 2 ++ 2 files changed, 21 insertions(+) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 29845e3..d0354a0 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2508,6 +2508,25 @@ static void vfio_check_af_flr(VFIOPCIDevice *vdev, uint8_t pos) } } +uint8_t vfio_find_free_cfg_reg(VFIOPCIDevice *vdev, int pos, uint8_t size) +{ + struct vfio_pci_cap_info reg_info = { + .argsz = sizeof(reg_info), + .offset = pos, + .index = VFIO_PCI_CAP_GET_FREE_REGION, + .size = size, + }; + int ret; + + ret = ioctl(vdev->vbasedev.fd, VFIO_GET_PCI_CAP_INFO, ®_info); + if (ret || reg_info.offset == 0) { + error_report("vfio: Failed to find free PCI config reg: %m\n"); + return -EFAULT; + } + + return reg_info.offset; +} + static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos) { PCIDevice *pdev = &vdev->pdev; diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index 9f360bf..6083300 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -156,3 +156,5 @@ typedef struct VFIORomBlacklistEntry { } VFIORomBlacklistEntry; #define MSIX_CAP_LENGTH 12 + +uint8_t vfio_find_free_cfg_reg(VFIOPCIDevice *vdev, int pos, uint8_t size);