From patchwork Mon Jul 18 23:09:22 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 9235601 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 111DA6075D for ; Mon, 18 Jul 2016 23:12:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 01E5326B4A for ; Mon, 18 Jul 2016 23:12:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EAA0B26AE3; Mon, 18 Jul 2016 23:12:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 912BA26490 for ; Mon, 18 Jul 2016 23:12:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752258AbcGRXJr (ORCPT ); Mon, 18 Jul 2016 19:09:47 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:53599 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752098AbcGRXJk (ORCPT ); Mon, 18 Jul 2016 19:09:40 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 15D8D6120C; Mon, 18 Jul 2016 23:09:40 +0000 (UTC) Received: from drakthul.qualcomm.com (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 3038B6037B; Mon, 18 Jul 2016 23:09:38 +0000 (UTC) From: Sinan Kaya To: kvm@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com, alex.williamson@redhat.com, eric.auger@redhat.com Cc: linux-acpi@vger.kernel.org, agross@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , Baptiste Reynal , linux-kernel@vger.kernel.org Subject: [PATCH V10 4/9] vfio: platform: add support for ACPI probe Date: Mon, 18 Jul 2016 19:09:22 -0400 Message-Id: <1468883367-2854-5-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1468883367-2854-1-git-send-email-okaya@codeaurora.org> References: <1468883367-2854-1-git-send-email-okaya@codeaurora.org> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The code is using the compatible DT string to associate a reset driver with the actual device itself. The compatible string does not exist on ACPI based systems. HID is the unique identifier for a device driver instead. Signed-off-by: Sinan Kaya --- drivers/vfio/platform/vfio_platform_common.c | 69 +++++++++++++++++++++++++-- drivers/vfio/platform/vfio_platform_private.h | 1 + 2 files changed, 65 insertions(+), 5 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index 6be92c3..a5299f6 100644 --- a/drivers/vfio/platform/vfio_platform_common.c +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -13,6 +13,7 @@ */ #include +#include #include #include #include @@ -49,6 +50,32 @@ static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, return reset_fn; } +static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, + struct device *dev) +{ + struct acpi_device *adev; + + if (acpi_disabled) + return -EPERM; + + adev = ACPI_COMPANION(dev); + if (!adev) { + pr_err("VFIO: ACPI companion device not found for %s\n", + vdev->name); + return -ENODEV; + } + +#ifdef CONFIG_ACPI + vdev->acpihid = acpi_device_hid(adev); + if (!vdev->acpihid) { + pr_err("VFIO: cannot find ACPI HID for %s\n", + vdev->name); + return -EINVAL; + } +#endif + return WARN_ON(!vdev->acpihid) ? -ENOENT : 0; +} + static bool vfio_platform_has_reset(struct vfio_platform_device *vdev) { return vdev->of_reset ? true : false; @@ -547,6 +574,37 @@ static const struct vfio_device_ops vfio_platform_ops = { .mmap = vfio_platform_mmap, }; +int vfio_platform_of_probe(struct vfio_platform_device *vdev, + struct device *dev) +{ + int ret; + + ret = device_property_read_string(dev, "compatible", + &vdev->compat); + if (ret) + pr_err("VFIO: cannot retrieve compat for %s\n", + vdev->name); + + return ret; +} + +/* + * There can be two kernel build combinations. One build where + * ACPI is not selected in Kconfig and another one with the ACPI Kconfig. + * + * In the first case, vfio_platform_acpi_probe will return since + * acpi_disabled is 1. DT user will not see any kind of messages from + * ACPI. + * + * In the second case, both DT and ACPI is compiled in but the system is + * booting with any of these combinations. + * + * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine + * terminates immediately without any messages. + * + * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are + * valid checks. We cannot claim that this system is DT. + */ int vfio_platform_probe_common(struct vfio_platform_device *vdev, struct device *dev) { @@ -556,11 +614,12 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev, if (!vdev) return -EINVAL; - ret = device_property_read_string(dev, "compatible", &vdev->compat); - if (ret) { - pr_err("VFIO: cannot retrieve compat for %s\n", vdev->name); - return -EINVAL; - } + ret = vfio_platform_acpi_probe(vdev, dev); + if (ret) + ret = vfio_platform_of_probe(vdev, dev); + + if (ret) + return ret; vdev->device = dev; diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index 71ed7d1..ba9e4f8 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -58,6 +58,7 @@ struct vfio_platform_device { struct mutex igate; struct module *parent_module; const char *compat; + const char *acpihid; struct module *reset_module; struct device *device;