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Wysocki" CC: Max Gurtovoy , Bjorn Helgaas , , , , , Abhishek Sahu Subject: [PATCH v3 0/8] vfio/pci: power management changes Date: Mon, 25 Apr 2022 14:56:07 +0530 Message-ID: <20220425092615.10133-1-abhsahu@nvidia.com> X-Mailer: git-send-email 2.17.1 X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d51f43c5-bda5-4cf2-1d50-08da269dad4f X-MS-TrafficTypeDiagnostic: MW3PR12MB4554:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.234;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230001)(4636009)(36840700001)(40470700004)(46966006)(316002)(54906003)(110136005)(2906002)(70206006)(40460700003)(7696005)(47076005)(1076003)(107886003)(6666004)(508600001)(82310400005)(86362001)(966005)(36860700001)(356005)(7416002)(70586007)(81166007)(83380400001)(36756003)(5660300002)(4326008)(8676002)(186003)(26005)(8936002)(426003)(336012)(2616005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Apr 2022 09:26:28.4304 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d51f43c5-bda5-4cf2-1d50-08da269dad4f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.234];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT065.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4554 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, there is very limited power management support available in the upstream vfio-pci driver. If there is no user of vfio-pci device, then it will be moved into D3Hot state. Similarly, if we enable the runtime power management for vfio-pci device in the guest OS, then the device is being runtime suspended (for linux guest OS) and the PCI device will be put into D3hot state (in function vfio_pm_config_write()). If the D3cold state can be used instead of D3hot, then it will help in saving maximum power. The D3cold state can't be possible with native PCI PM. It requires interaction with platform firmware which is system-specific. To go into low power states (including D3cold), the runtime PM framework can be used which internally interacts with PCI and platform firmware and puts the device into the lowest possible D-States. This patch series registers the vfio-pci driver with runtime PM framework and uses the same for moving the physical PCI device to go into the low power state. The current PM support was added with commit 6eb7018705de ("vfio-pci: Move idle devices to D3hot power state") where the following point was mentioned regarding D3cold state. "It's tempting to try to use D3cold, but we have no reason to inhibit hotplug of idle devices and we might get into a loop of having the device disappear before we have a chance to try to use it." With the runtime PM, if the user want to prevent going into D3cold then /sys/bus/pci/devices/.../d3cold_allowed can be set to 0 for the devices where the above functionality is required instead of disallowing the D3cold state for all the cases. Since D3cold state can't be achieved by writing PCI standard PM config registers, so a feature has been added in DEVICE_FEATURE IOCTL for low power related handling, which changes the PCI device from D3hot to D3cold state and then D3cold to D0 state. The hypervisors can implement virtual ACPI methods. For example, in guest linux OS if PCI device ACPI node has _PR3 and _PR0 power resources with _ON/_OFF method, then guest linux OS makes the _OFF call during D3cold transition and then _ON during D0 transition. The hypervisor can tap these virtual ACPI calls and then do the D3cold related IOCTL in vfio driver. The BAR access needs to be disabled if device is in D3hot state. Also, there should not be any config access if device is in D3cold state. For SR-IOV, the PF power state should be higher than VF's power state. * Changes in v3 - Rebased patches on v5.18-rc3. - Marked this series as PATCH instead of RFC. - Addressed the review comments given in v2. - Removed the limitation to keep device in D0 state if there is any access from host side. This is specific to NVIDIA use case and will be handled separately. - Used the existing DEVICE_FEATURE IOCTL itself instead of adding new IOCTL for power management. - Removed all custom code related with power management in runtime suspend/resume callbacks and IOCTL handling. Now, the callbacks contain code related with INTx handling and few other stuffs and all the PCI state and platform PM handling will be done by PCI core functions itself. - Add the support of wake-up in main vfio layer itself since now we have more vfio/pci based drivers. - Instead of assigning the 'struct dev_pm_ops' in individual parent driver, now the vfio_pci_core tself assigns the 'struct dev_pm_ops'. - Added handling of power management around SR-IOV handling. - Moved the setting of drvdata in a separate patch. - Masked INTx before during runtime suspended state. - Changed the order of patches so that Fix related things are at beginning of this patch series. - Removed storing the power state locally and used one new boolean to track the d3 (D3cold and D3hot) power state - Removed check for IO access in D3 power state. - Used another helper function vfio_lock_and_set_power_state() instead of touching vfio_pci_set_power_state(). - Considered the fixes made in https://lore.kernel.org/lkml/20220217122107.22434-1-abhsahu@nvidia.com and updated the patches accordingly. * Changes in v2 (https://lore.kernel.org/lkml/20220124181726.19174-1-abhsahu@nvidia.com) - Rebased patches on v5.17-rc1. - Included the patch to handle BAR access in D3cold. - Included the patch to fix memory leak. - Made a separate IOCTL that can be used to change the power state from D3hot to D3cold and D3cold to D0. - Addressed the review comments given in v1. * v1 https://lore.kernel.org/lkml/20211115133640.2231-1-abhsahu@nvidia.com/ Abhishek Sahu (8): vfio/pci: Invalidate mmaps and block the access in D3hot power state vfio/pci: Change the PF power state to D0 before enabling VFs vfio/pci: Virtualize PME related registers bits and initialize to zero vfio/pci: Add support for setting driver data inside core layer vfio/pci: Enable runtime PM for vfio_pci_core based drivers vfio: Invoke runtime PM API for IOCTL request vfio/pci: Mask INTx during runtime suspend vfio/pci: Add the support for PCI D3cold state .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 4 +- drivers/vfio/pci/mlx5/main.c | 3 +- drivers/vfio/pci/vfio_pci.c | 4 +- drivers/vfio/pci/vfio_pci_config.c | 63 ++- drivers/vfio/pci/vfio_pci_core.c | 358 +++++++++++++++--- drivers/vfio/pci/vfio_pci_intrs.c | 6 +- drivers/vfio/pci/vfio_pci_rdwr.c | 6 +- drivers/vfio/vfio.c | 44 ++- include/linux/vfio_pci_core.h | 12 +- include/uapi/linux/vfio.h | 18 + 10 files changed, 445 insertions(+), 73 deletions(-) -- 2.17.1