From patchwork Sat May 28 22:01:13 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 9139595 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 8B22460759 for ; Sat, 28 May 2016 22:04:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7BBB120499 for ; Sat, 28 May 2016 22:04:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7072826E82; Sat, 28 May 2016 22:04:07 +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 1FB9820499 for ; Sat, 28 May 2016 22:04:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752546AbcE1WDm (ORCPT ); Sat, 28 May 2016 18:03:42 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:43091 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751428AbcE1WBa (ORCPT ); Sat, 28 May 2016 18:01:30 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9F9EF613AF; Sat, 28 May 2016 22:01:29 +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 E79DD613B7; Sat, 28 May 2016 22:01:27 +0000 (UTC) From: Sinan Kaya To: kvm@vger.kernel.org, timur@codeaurora.org, cov@codeaurora.org, jcm@redhat.com, eric.auger@linaro.org 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 , Alex Williamson , linux-kernel@vger.kernel.org Subject: [PATCH V6 3/8] vfio: platform: add support for ACPI probe Date: Sat, 28 May 2016 18:01:13 -0400 Message-Id: <1464472878-27176-4-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1464472878-27176-1-git-send-email-okaya@codeaurora.org> References: <1464472878-27176-1-git-send-email-okaya@codeaurora.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@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 | 57 ++++++++++++++++++++++++--- drivers/vfio/platform/vfio_platform_private.h | 1 + 2 files changed, 53 insertions(+), 5 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index 6be92c3..fbf4565 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 +50,37 @@ static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, return reset_fn; } +#ifdef CONFIG_ACPI +static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, + struct device *dev) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + + if (acpi_disabled) + return -ENODEV; + + if (!adev) { + pr_err("VFIO: ACPI companion device not found for %s\n", + vdev->name); + return -ENODEV; + } + + vdev->acpihid = acpi_device_hid(adev); + if (!vdev->acpihid) { + pr_err("VFIO: cannot find ACPI HID for %s\n", + vdev->name); + return -ENODEV; + } + return 0; +} +#else +static inline int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, + struct device *dev) +{ + return -ENOENT; +} +#endif + static bool vfio_platform_has_reset(struct vfio_platform_device *vdev) { return vdev->of_reset ? true : false; @@ -547,6 +579,20 @@ 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; +} + int vfio_platform_probe_common(struct vfio_platform_device *vdev, struct device *dev) { @@ -556,11 +602,12 @@ 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;