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 617CFC43334 for ; Wed, 6 Jul 2022 15:40:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234716AbiGFPkE (ORCPT ); Wed, 6 Jul 2022 11:40:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234443AbiGFPh1 (ORCPT ); Wed, 6 Jul 2022 11:37:27 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE5092AE06; Wed, 6 Jul 2022 08:33:56 -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 03C6BB81D96; Wed, 6 Jul 2022 15:33:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7D7BC341C8; Wed, 6 Jul 2022 15:33:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657121633; bh=Jh87tjDMw8NWd++8ckUVxmtj3zAcSZTShiVA8LEMt1Y=; h=From:To:Cc:Subject:Date:From; b=T+MlEn7Og4db6tFqJzjN1bn3hVYoSf98UMpySL7P1fCD4M3bUQEA6KI9Zg0rqUlA0 nFCH+xkSDt+0tT1mCoO7lqRBz9M5A8GApKyk8gbiitvs3VZJxKX01xrCf1NAt0Fxrq barFeJSCbtoh9G9sYEkEineLJ51LoygYdM9PwSfoZQGTV9vrSo0p4XsstDP06JKrKK NWIKFZUzKyx0eW2fwBWpeOYMboSNklq4hXmUJCaH3oBpEtB6d11KNweLWvFsVoVI2Q HqoApH5mmSfnwO8ANlPGlXtvyJvTA4P+FdIr4PxtgAa1y8MValuBDpg7w663pBL+IY tivBBK4J4F/+A== 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 4.14 1/8] virtio_mmio: Add missing PM calls to freeze/restore Date: Wed, 6 Jul 2022 11:33:43 -0400 Message-Id: <20220706153351.1598805-1-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 181386e06cb7..d0a7f69782a4 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -66,6 +66,7 @@ #include #include #include +#include #include #include #include @@ -492,6 +493,25 @@ 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_empty(struct device *_d) {} @@ -735,6 +755,9 @@ 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