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686 lines
16 KiB
686 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* vDPA bus. |
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* |
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* Copyright (c) 2020, Red Hat. All rights reserved. |
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* Author: Jason Wang <[email protected]> |
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* |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/idr.h> |
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#include <linux/slab.h> |
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#include <linux/vdpa.h> |
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#include <uapi/linux/vdpa.h> |
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#include <net/genetlink.h> |
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#include <linux/mod_devicetable.h> |
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static LIST_HEAD(mdev_head); |
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/* A global mutex that protects vdpa management device and device level operations. */ |
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static DEFINE_MUTEX(vdpa_dev_mutex); |
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static DEFINE_IDA(vdpa_index_ida); |
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static struct genl_family vdpa_nl_family; |
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static int vdpa_dev_probe(struct device *d) |
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{ |
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struct vdpa_device *vdev = dev_to_vdpa(d); |
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struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver); |
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int ret = 0; |
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if (drv && drv->probe) |
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ret = drv->probe(vdev); |
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return ret; |
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} |
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static void vdpa_dev_remove(struct device *d) |
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{ |
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struct vdpa_device *vdev = dev_to_vdpa(d); |
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struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver); |
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if (drv && drv->remove) |
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drv->remove(vdev); |
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} |
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static struct bus_type vdpa_bus = { |
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.name = "vdpa", |
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.probe = vdpa_dev_probe, |
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.remove = vdpa_dev_remove, |
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}; |
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static void vdpa_release_dev(struct device *d) |
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{ |
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struct vdpa_device *vdev = dev_to_vdpa(d); |
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const struct vdpa_config_ops *ops = vdev->config; |
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if (ops->free) |
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ops->free(vdev); |
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ida_simple_remove(&vdpa_index_ida, vdev->index); |
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kfree(vdev); |
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} |
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/** |
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* __vdpa_alloc_device - allocate and initilaize a vDPA device |
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* This allows driver to some prepartion after device is |
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* initialized but before registered. |
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* @parent: the parent device |
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* @config: the bus operations that is supported by this device |
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* @size: size of the parent structure that contains private data |
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* @name: name of the vdpa device; optional. |
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* @use_va: indicate whether virtual address must be used by this device |
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* |
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* Driver should use vdpa_alloc_device() wrapper macro instead of |
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* using this directly. |
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* |
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* Return: Returns an error when parent/config/dma_dev is not set or fail to get |
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* ida. |
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*/ |
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struct vdpa_device *__vdpa_alloc_device(struct device *parent, |
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const struct vdpa_config_ops *config, |
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size_t size, const char *name, |
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bool use_va) |
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{ |
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struct vdpa_device *vdev; |
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int err = -EINVAL; |
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if (!config) |
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goto err; |
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if (!!config->dma_map != !!config->dma_unmap) |
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goto err; |
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/* It should only work for the device that use on-chip IOMMU */ |
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if (use_va && !(config->dma_map || config->set_map)) |
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goto err; |
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err = -ENOMEM; |
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vdev = kzalloc(size, GFP_KERNEL); |
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if (!vdev) |
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goto err; |
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err = ida_alloc(&vdpa_index_ida, GFP_KERNEL); |
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if (err < 0) |
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goto err_ida; |
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vdev->dev.bus = &vdpa_bus; |
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vdev->dev.parent = parent; |
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vdev->dev.release = vdpa_release_dev; |
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vdev->index = err; |
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vdev->config = config; |
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vdev->features_valid = false; |
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vdev->use_va = use_va; |
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if (name) |
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err = dev_set_name(&vdev->dev, "%s", name); |
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else |
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err = dev_set_name(&vdev->dev, "vdpa%u", vdev->index); |
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if (err) |
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goto err_name; |
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device_initialize(&vdev->dev); |
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return vdev; |
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err_name: |
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ida_simple_remove(&vdpa_index_ida, vdev->index); |
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err_ida: |
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kfree(vdev); |
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err: |
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return ERR_PTR(err); |
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} |
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EXPORT_SYMBOL_GPL(__vdpa_alloc_device); |
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static int vdpa_name_match(struct device *dev, const void *data) |
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{ |
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struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); |
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return (strcmp(dev_name(&vdev->dev), data) == 0); |
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} |
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static int __vdpa_register_device(struct vdpa_device *vdev, int nvqs) |
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{ |
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struct device *dev; |
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vdev->nvqs = nvqs; |
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lockdep_assert_held(&vdpa_dev_mutex); |
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dev = bus_find_device(&vdpa_bus, NULL, dev_name(&vdev->dev), vdpa_name_match); |
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if (dev) { |
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put_device(dev); |
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return -EEXIST; |
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} |
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return device_add(&vdev->dev); |
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} |
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/** |
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* _vdpa_register_device - register a vDPA device with vdpa lock held |
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* Caller must have a succeed call of vdpa_alloc_device() before. |
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* Caller must invoke this routine in the management device dev_add() |
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* callback after setting up valid mgmtdev for this vdpa device. |
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* @vdev: the vdpa device to be registered to vDPA bus |
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* @nvqs: number of virtqueues supported by this device |
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* |
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* Return: Returns an error when fail to add device to vDPA bus |
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*/ |
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int _vdpa_register_device(struct vdpa_device *vdev, int nvqs) |
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{ |
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if (!vdev->mdev) |
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return -EINVAL; |
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return __vdpa_register_device(vdev, nvqs); |
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} |
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EXPORT_SYMBOL_GPL(_vdpa_register_device); |
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/** |
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* vdpa_register_device - register a vDPA device |
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* Callers must have a succeed call of vdpa_alloc_device() before. |
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* @vdev: the vdpa device to be registered to vDPA bus |
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* @nvqs: number of virtqueues supported by this device |
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* |
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* Return: Returns an error when fail to add to vDPA bus |
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*/ |
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int vdpa_register_device(struct vdpa_device *vdev, int nvqs) |
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{ |
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int err; |
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mutex_lock(&vdpa_dev_mutex); |
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err = __vdpa_register_device(vdev, nvqs); |
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mutex_unlock(&vdpa_dev_mutex); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(vdpa_register_device); |
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/** |
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* _vdpa_unregister_device - unregister a vDPA device |
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* Caller must invoke this routine as part of management device dev_del() |
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* callback. |
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* @vdev: the vdpa device to be unregisted from vDPA bus |
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*/ |
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void _vdpa_unregister_device(struct vdpa_device *vdev) |
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{ |
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lockdep_assert_held(&vdpa_dev_mutex); |
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WARN_ON(!vdev->mdev); |
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device_unregister(&vdev->dev); |
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} |
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EXPORT_SYMBOL_GPL(_vdpa_unregister_device); |
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/** |
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* vdpa_unregister_device - unregister a vDPA device |
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* @vdev: the vdpa device to be unregisted from vDPA bus |
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*/ |
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void vdpa_unregister_device(struct vdpa_device *vdev) |
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{ |
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mutex_lock(&vdpa_dev_mutex); |
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device_unregister(&vdev->dev); |
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mutex_unlock(&vdpa_dev_mutex); |
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} |
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EXPORT_SYMBOL_GPL(vdpa_unregister_device); |
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/** |
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* __vdpa_register_driver - register a vDPA device driver |
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* @drv: the vdpa device driver to be registered |
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* @owner: module owner of the driver |
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* |
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* Return: Returns an err when fail to do the registration |
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*/ |
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int __vdpa_register_driver(struct vdpa_driver *drv, struct module *owner) |
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{ |
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drv->driver.bus = &vdpa_bus; |
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drv->driver.owner = owner; |
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return driver_register(&drv->driver); |
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} |
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EXPORT_SYMBOL_GPL(__vdpa_register_driver); |
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/** |
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* vdpa_unregister_driver - unregister a vDPA device driver |
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* @drv: the vdpa device driver to be unregistered |
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*/ |
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void vdpa_unregister_driver(struct vdpa_driver *drv) |
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{ |
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driver_unregister(&drv->driver); |
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} |
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EXPORT_SYMBOL_GPL(vdpa_unregister_driver); |
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/** |
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* vdpa_mgmtdev_register - register a vdpa management device |
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* |
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* @mdev: Pointer to vdpa management device |
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* vdpa_mgmtdev_register() register a vdpa management device which supports |
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* vdpa device management. |
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* Return: Returns 0 on success or failure when required callback ops are not |
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* initialized. |
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*/ |
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int vdpa_mgmtdev_register(struct vdpa_mgmt_dev *mdev) |
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{ |
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if (!mdev->device || !mdev->ops || !mdev->ops->dev_add || !mdev->ops->dev_del) |
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return -EINVAL; |
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INIT_LIST_HEAD(&mdev->list); |
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mutex_lock(&vdpa_dev_mutex); |
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list_add_tail(&mdev->list, &mdev_head); |
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mutex_unlock(&vdpa_dev_mutex); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(vdpa_mgmtdev_register); |
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static int vdpa_match_remove(struct device *dev, void *data) |
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{ |
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struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); |
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struct vdpa_mgmt_dev *mdev = vdev->mdev; |
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if (mdev == data) |
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mdev->ops->dev_del(mdev, vdev); |
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return 0; |
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} |
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void vdpa_mgmtdev_unregister(struct vdpa_mgmt_dev *mdev) |
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{ |
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mutex_lock(&vdpa_dev_mutex); |
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list_del(&mdev->list); |
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/* Filter out all the entries belong to this management device and delete it. */ |
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bus_for_each_dev(&vdpa_bus, NULL, mdev, vdpa_match_remove); |
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mutex_unlock(&vdpa_dev_mutex); |
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} |
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EXPORT_SYMBOL_GPL(vdpa_mgmtdev_unregister); |
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static bool mgmtdev_handle_match(const struct vdpa_mgmt_dev *mdev, |
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const char *busname, const char *devname) |
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{ |
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/* Bus name is optional for simulated management device, so ignore the |
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* device with bus if bus attribute is provided. |
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*/ |
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if ((busname && !mdev->device->bus) || (!busname && mdev->device->bus)) |
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return false; |
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if (!busname && strcmp(dev_name(mdev->device), devname) == 0) |
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return true; |
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if (busname && (strcmp(mdev->device->bus->name, busname) == 0) && |
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(strcmp(dev_name(mdev->device), devname) == 0)) |
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return true; |
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return false; |
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} |
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static struct vdpa_mgmt_dev *vdpa_mgmtdev_get_from_attr(struct nlattr **attrs) |
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{ |
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struct vdpa_mgmt_dev *mdev; |
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const char *busname = NULL; |
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const char *devname; |
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if (!attrs[VDPA_ATTR_MGMTDEV_DEV_NAME]) |
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return ERR_PTR(-EINVAL); |
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devname = nla_data(attrs[VDPA_ATTR_MGMTDEV_DEV_NAME]); |
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if (attrs[VDPA_ATTR_MGMTDEV_BUS_NAME]) |
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busname = nla_data(attrs[VDPA_ATTR_MGMTDEV_BUS_NAME]); |
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list_for_each_entry(mdev, &mdev_head, list) { |
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if (mgmtdev_handle_match(mdev, busname, devname)) |
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return mdev; |
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} |
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return ERR_PTR(-ENODEV); |
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} |
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static int vdpa_nl_mgmtdev_handle_fill(struct sk_buff *msg, const struct vdpa_mgmt_dev *mdev) |
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{ |
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if (mdev->device->bus && |
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nla_put_string(msg, VDPA_ATTR_MGMTDEV_BUS_NAME, mdev->device->bus->name)) |
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return -EMSGSIZE; |
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if (nla_put_string(msg, VDPA_ATTR_MGMTDEV_DEV_NAME, dev_name(mdev->device))) |
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return -EMSGSIZE; |
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return 0; |
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} |
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static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg, |
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u32 portid, u32 seq, int flags) |
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{ |
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u64 supported_classes = 0; |
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void *hdr; |
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int i = 0; |
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int err; |
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hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW); |
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if (!hdr) |
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return -EMSGSIZE; |
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err = vdpa_nl_mgmtdev_handle_fill(msg, mdev); |
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if (err) |
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goto msg_err; |
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while (mdev->id_table[i].device) { |
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supported_classes |= BIT(mdev->id_table[i].device); |
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i++; |
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} |
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if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES, |
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supported_classes, VDPA_ATTR_UNSPEC)) { |
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err = -EMSGSIZE; |
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goto msg_err; |
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} |
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genlmsg_end(msg, hdr); |
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return 0; |
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msg_err: |
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genlmsg_cancel(msg, hdr); |
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return err; |
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} |
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static int vdpa_nl_cmd_mgmtdev_get_doit(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct vdpa_mgmt_dev *mdev; |
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struct sk_buff *msg; |
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int err; |
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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mutex_lock(&vdpa_dev_mutex); |
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mdev = vdpa_mgmtdev_get_from_attr(info->attrs); |
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if (IS_ERR(mdev)) { |
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mutex_unlock(&vdpa_dev_mutex); |
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NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified mgmt device"); |
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err = PTR_ERR(mdev); |
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goto out; |
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} |
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err = vdpa_mgmtdev_fill(mdev, msg, info->snd_portid, info->snd_seq, 0); |
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mutex_unlock(&vdpa_dev_mutex); |
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if (err) |
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goto out; |
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err = genlmsg_reply(msg, info); |
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return err; |
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out: |
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nlmsg_free(msg); |
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return err; |
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} |
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static int |
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vdpa_nl_cmd_mgmtdev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) |
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{ |
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struct vdpa_mgmt_dev *mdev; |
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int start = cb->args[0]; |
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int idx = 0; |
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int err; |
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mutex_lock(&vdpa_dev_mutex); |
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list_for_each_entry(mdev, &mdev_head, list) { |
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if (idx < start) { |
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idx++; |
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continue; |
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} |
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err = vdpa_mgmtdev_fill(mdev, msg, NETLINK_CB(cb->skb).portid, |
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cb->nlh->nlmsg_seq, NLM_F_MULTI); |
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if (err) |
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goto out; |
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idx++; |
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} |
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out: |
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mutex_unlock(&vdpa_dev_mutex); |
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cb->args[0] = idx; |
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return msg->len; |
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} |
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static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct vdpa_mgmt_dev *mdev; |
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const char *name; |
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int err = 0; |
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if (!info->attrs[VDPA_ATTR_DEV_NAME]) |
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return -EINVAL; |
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name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); |
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mutex_lock(&vdpa_dev_mutex); |
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mdev = vdpa_mgmtdev_get_from_attr(info->attrs); |
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if (IS_ERR(mdev)) { |
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NL_SET_ERR_MSG_MOD(info->extack, "Fail to find the specified management device"); |
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err = PTR_ERR(mdev); |
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goto err; |
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} |
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err = mdev->ops->dev_add(mdev, name); |
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err: |
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mutex_unlock(&vdpa_dev_mutex); |
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return err; |
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} |
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static int vdpa_nl_cmd_dev_del_set_doit(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct vdpa_mgmt_dev *mdev; |
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struct vdpa_device *vdev; |
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struct device *dev; |
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const char *name; |
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int err = 0; |
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if (!info->attrs[VDPA_ATTR_DEV_NAME]) |
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return -EINVAL; |
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name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); |
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mutex_lock(&vdpa_dev_mutex); |
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dev = bus_find_device(&vdpa_bus, NULL, name, vdpa_name_match); |
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if (!dev) { |
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NL_SET_ERR_MSG_MOD(info->extack, "device not found"); |
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err = -ENODEV; |
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goto dev_err; |
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} |
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vdev = container_of(dev, struct vdpa_device, dev); |
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if (!vdev->mdev) { |
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NL_SET_ERR_MSG_MOD(info->extack, "Only user created device can be deleted by user"); |
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err = -EINVAL; |
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goto mdev_err; |
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} |
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mdev = vdev->mdev; |
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mdev->ops->dev_del(mdev, vdev); |
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mdev_err: |
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put_device(dev); |
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dev_err: |
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mutex_unlock(&vdpa_dev_mutex); |
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return err; |
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} |
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static int |
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vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq, |
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int flags, struct netlink_ext_ack *extack) |
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{ |
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u16 max_vq_size; |
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u32 device_id; |
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u32 vendor_id; |
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void *hdr; |
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int err; |
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hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_DEV_NEW); |
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if (!hdr) |
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return -EMSGSIZE; |
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err = vdpa_nl_mgmtdev_handle_fill(msg, vdev->mdev); |
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if (err) |
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goto msg_err; |
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device_id = vdev->config->get_device_id(vdev); |
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vendor_id = vdev->config->get_vendor_id(vdev); |
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max_vq_size = vdev->config->get_vq_num_max(vdev); |
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err = -EMSGSIZE; |
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if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) |
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goto msg_err; |
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if (nla_put_u32(msg, VDPA_ATTR_DEV_ID, device_id)) |
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goto msg_err; |
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if (nla_put_u32(msg, VDPA_ATTR_DEV_VENDOR_ID, vendor_id)) |
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goto msg_err; |
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if (nla_put_u32(msg, VDPA_ATTR_DEV_MAX_VQS, vdev->nvqs)) |
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goto msg_err; |
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if (nla_put_u16(msg, VDPA_ATTR_DEV_MAX_VQ_SIZE, max_vq_size)) |
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goto msg_err; |
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genlmsg_end(msg, hdr); |
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return 0; |
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msg_err: |
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genlmsg_cancel(msg, hdr); |
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return err; |
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} |
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static int vdpa_nl_cmd_dev_get_doit(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct vdpa_device *vdev; |
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struct sk_buff *msg; |
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const char *devname; |
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struct device *dev; |
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int err; |
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|
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if (!info->attrs[VDPA_ATTR_DEV_NAME]) |
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return -EINVAL; |
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devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]); |
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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mutex_lock(&vdpa_dev_mutex); |
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dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match); |
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if (!dev) { |
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NL_SET_ERR_MSG_MOD(info->extack, "device not found"); |
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err = -ENODEV; |
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goto err; |
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} |
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vdev = container_of(dev, struct vdpa_device, dev); |
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if (!vdev->mdev) { |
|
err = -EINVAL; |
|
goto mdev_err; |
|
} |
|
err = vdpa_dev_fill(vdev, msg, info->snd_portid, info->snd_seq, 0, info->extack); |
|
if (!err) |
|
err = genlmsg_reply(msg, info); |
|
mdev_err: |
|
put_device(dev); |
|
err: |
|
mutex_unlock(&vdpa_dev_mutex); |
|
if (err) |
|
nlmsg_free(msg); |
|
return err; |
|
} |
|
|
|
struct vdpa_dev_dump_info { |
|
struct sk_buff *msg; |
|
struct netlink_callback *cb; |
|
int start_idx; |
|
int idx; |
|
}; |
|
|
|
static int vdpa_dev_dump(struct device *dev, void *data) |
|
{ |
|
struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev); |
|
struct vdpa_dev_dump_info *info = data; |
|
int err; |
|
|
|
if (!vdev->mdev) |
|
return 0; |
|
if (info->idx < info->start_idx) { |
|
info->idx++; |
|
return 0; |
|
} |
|
err = vdpa_dev_fill(vdev, info->msg, NETLINK_CB(info->cb->skb).portid, |
|
info->cb->nlh->nlmsg_seq, NLM_F_MULTI, info->cb->extack); |
|
if (err) |
|
return err; |
|
|
|
info->idx++; |
|
return 0; |
|
} |
|
|
|
static int vdpa_nl_cmd_dev_get_dumpit(struct sk_buff *msg, struct netlink_callback *cb) |
|
{ |
|
struct vdpa_dev_dump_info info; |
|
|
|
info.msg = msg; |
|
info.cb = cb; |
|
info.start_idx = cb->args[0]; |
|
info.idx = 0; |
|
|
|
mutex_lock(&vdpa_dev_mutex); |
|
bus_for_each_dev(&vdpa_bus, NULL, &info, vdpa_dev_dump); |
|
mutex_unlock(&vdpa_dev_mutex); |
|
cb->args[0] = info.idx; |
|
return msg->len; |
|
} |
|
|
|
static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { |
|
[VDPA_ATTR_MGMTDEV_BUS_NAME] = { .type = NLA_NUL_STRING }, |
|
[VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING }, |
|
[VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING }, |
|
}; |
|
|
|
static const struct genl_ops vdpa_nl_ops[] = { |
|
{ |
|
.cmd = VDPA_CMD_MGMTDEV_GET, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.doit = vdpa_nl_cmd_mgmtdev_get_doit, |
|
.dumpit = vdpa_nl_cmd_mgmtdev_get_dumpit, |
|
}, |
|
{ |
|
.cmd = VDPA_CMD_DEV_NEW, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.doit = vdpa_nl_cmd_dev_add_set_doit, |
|
.flags = GENL_ADMIN_PERM, |
|
}, |
|
{ |
|
.cmd = VDPA_CMD_DEV_DEL, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.doit = vdpa_nl_cmd_dev_del_set_doit, |
|
.flags = GENL_ADMIN_PERM, |
|
}, |
|
{ |
|
.cmd = VDPA_CMD_DEV_GET, |
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
|
.doit = vdpa_nl_cmd_dev_get_doit, |
|
.dumpit = vdpa_nl_cmd_dev_get_dumpit, |
|
}, |
|
}; |
|
|
|
static struct genl_family vdpa_nl_family __ro_after_init = { |
|
.name = VDPA_GENL_NAME, |
|
.version = VDPA_GENL_VERSION, |
|
.maxattr = VDPA_ATTR_MAX, |
|
.policy = vdpa_nl_policy, |
|
.netnsok = false, |
|
.module = THIS_MODULE, |
|
.ops = vdpa_nl_ops, |
|
.n_ops = ARRAY_SIZE(vdpa_nl_ops), |
|
}; |
|
|
|
static int vdpa_init(void) |
|
{ |
|
int err; |
|
|
|
err = bus_register(&vdpa_bus); |
|
if (err) |
|
return err; |
|
err = genl_register_family(&vdpa_nl_family); |
|
if (err) |
|
goto err; |
|
return 0; |
|
|
|
err: |
|
bus_unregister(&vdpa_bus); |
|
return err; |
|
} |
|
|
|
static void __exit vdpa_exit(void) |
|
{ |
|
genl_unregister_family(&vdpa_nl_family); |
|
bus_unregister(&vdpa_bus); |
|
ida_destroy(&vdpa_index_ida); |
|
} |
|
core_initcall(vdpa_init); |
|
module_exit(vdpa_exit); |
|
|
|
MODULE_AUTHOR("Jason Wang <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|