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123 lines
2.5 KiB
123 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* MDEV driver |
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* |
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. |
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* Author: Neo Jia <[email protected]> |
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* Kirti Wankhede <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/iommu.h> |
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#include <linux/mdev.h> |
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#include "mdev_private.h" |
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static int mdev_attach_iommu(struct mdev_device *mdev) |
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{ |
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int ret; |
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struct iommu_group *group; |
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group = iommu_group_alloc(); |
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if (IS_ERR(group)) |
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return PTR_ERR(group); |
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ret = iommu_group_add_device(group, &mdev->dev); |
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if (!ret) |
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dev_info(&mdev->dev, "MDEV: group_id = %d\n", |
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iommu_group_id(group)); |
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iommu_group_put(group); |
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return ret; |
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} |
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static void mdev_detach_iommu(struct mdev_device *mdev) |
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{ |
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iommu_group_remove_device(&mdev->dev); |
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dev_info(&mdev->dev, "MDEV: detaching iommu\n"); |
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} |
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static int mdev_probe(struct device *dev) |
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{ |
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struct mdev_driver *drv = |
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container_of(dev->driver, struct mdev_driver, driver); |
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struct mdev_device *mdev = to_mdev_device(dev); |
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int ret; |
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ret = mdev_attach_iommu(mdev); |
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if (ret) |
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return ret; |
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if (drv->probe) { |
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ret = drv->probe(mdev); |
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if (ret) |
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mdev_detach_iommu(mdev); |
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} |
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return ret; |
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} |
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static void mdev_remove(struct device *dev) |
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{ |
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struct mdev_driver *drv = |
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container_of(dev->driver, struct mdev_driver, driver); |
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struct mdev_device *mdev = to_mdev_device(dev); |
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if (drv->remove) |
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drv->remove(mdev); |
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mdev_detach_iommu(mdev); |
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} |
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static int mdev_match(struct device *dev, struct device_driver *drv) |
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{ |
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/* |
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* No drivers automatically match. Drivers are only bound by explicit |
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* device_driver_attach() |
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*/ |
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return 0; |
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} |
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struct bus_type mdev_bus_type = { |
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.name = "mdev", |
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.probe = mdev_probe, |
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.remove = mdev_remove, |
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.match = mdev_match, |
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}; |
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EXPORT_SYMBOL_GPL(mdev_bus_type); |
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/** |
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* mdev_register_driver - register a new MDEV driver |
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* @drv: the driver to register |
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* |
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* Returns a negative value on error, otherwise 0. |
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**/ |
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int mdev_register_driver(struct mdev_driver *drv) |
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{ |
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/* initialize common driver fields */ |
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drv->driver.bus = &mdev_bus_type; |
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/* register with core */ |
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return driver_register(&drv->driver); |
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} |
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EXPORT_SYMBOL(mdev_register_driver); |
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/* |
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* mdev_unregister_driver - unregister MDEV driver |
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* @drv: the driver to unregister |
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*/ |
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void mdev_unregister_driver(struct mdev_driver *drv) |
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{ |
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driver_unregister(&drv->driver); |
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} |
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EXPORT_SYMBOL(mdev_unregister_driver); |
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int mdev_bus_register(void) |
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{ |
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return bus_register(&mdev_bus_type); |
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} |
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void mdev_bus_unregister(void) |
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{ |
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bus_unregister(&mdev_bus_type); |
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}
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