From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82377CCA473 for ; Wed, 6 Jul 2022 15:37:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234509AbiGFPhL (ORCPT ); Wed, 6 Jul 2022 11:37:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234395AbiGFPgL (ORCPT ); Wed, 6 Jul 2022 11:36:11 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 23CE626571; Wed, 6 Jul 2022 08:33:40 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 879D1B81D8E; Wed, 6 Jul 2022 15:33:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 85254C3411C; Wed, 6 Jul 2022 15:33:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657121618; bh=hpgqN9gPyrD+s6Zv2Qf9lSxoie1Cst3YbDw+RW+CBV8=; h=From:To:Cc:Subject:Date:From; b=qJkUnMGK6/W6w/JcCHj5fJscqmiwFHyeByDrTFDacnZpH2+tnR2YdcAd3Vctl2BA6 wxCMYqHVlwb4ADxVDPbuMycPF1CAFUOjSMS8ZiuDQ8REVVhPj78YySXg73BjD5lcp7 4Y88x6+8aHxIH2zLq4XgFtBPYKOHqV3Bg59j31wfobviKrH60Ku1I5irNKj606S2zZ Ywe3LIyFUikO4Kg90MLRUj8XP/PmN7NfQ3bPXTbqfFpjX4HhByaLAvX4ibutrUIayi FoBIwd0rcOZhRkCaY38c+zAkmeTufHRy4BNqhhMOB0rPDnPwx6xz50NfAF1apP3/XD lroiOKV7oqc7A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Stephan Gerhold , "Michael S . Tsirkin" , Sasha Levin , jasowang@redhat.com, virtualization@lists.linux-foundation.org Subject: [PATCH AUTOSEL 4.19 1/8] virtio_mmio: Add missing PM calls to freeze/restore Date: Wed, 6 Jul 2022 11:33:28 -0400 Message-Id: <20220706153335.1598699-1-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephan Gerhold [ Upstream commit ed7ac37fde33ccd84e4bd2b9363c191f925364c7 ] Most virtio drivers provide freeze/restore callbacks to finish up device usage before suspend and to reinitialize the virtio device after resume. However, these callbacks are currently only called when using virtio_pci. virtio_mmio does not have any PM ops defined. This causes problems for example after suspend to disk (hibernation), since the virtio devices might lose their state after the VMM is restarted. Calling virtio_device_freeze()/restore() ensures that the virtio devices are re-initialized correctly. Fix this by implementing the dev_pm_ops for virtio_mmio, similar to virtio_pci_common. Signed-off-by: Stephan Gerhold Message-Id: <20220621110621.3638025-2-stephan.gerhold@kernkonzept.com> Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin --- drivers/virtio/virtio_mmio.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index c69c755bf553..79474bd0c52c 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -66,6 +66,7 @@ #include #include #include +#include #include #include #include @@ -508,6 +509,25 @@ static const struct virtio_config_ops virtio_mmio_config_ops = { .bus_name = vm_bus_name, }; +#ifdef CONFIG_PM_SLEEP +static int virtio_mmio_freeze(struct device *dev) +{ + struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev); + + return virtio_device_freeze(&vm_dev->vdev); +} + +static int virtio_mmio_restore(struct device *dev) +{ + struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev); + + return virtio_device_restore(&vm_dev->vdev); +} + +static const struct dev_pm_ops virtio_mmio_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(virtio_mmio_freeze, virtio_mmio_restore) +}; +#endif static void virtio_mmio_release_dev(struct device *_d) { @@ -761,6 +781,9 @@ static struct platform_driver virtio_mmio_driver = { .name = "virtio-mmio", .of_match_table = virtio_mmio_match, .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), +#ifdef CONFIG_PM_SLEEP + .pm = &virtio_mmio_pm_ops, +#endif }, }; -- 2.35.1