1178 lines
30 KiB
C
1178 lines
30 KiB
C
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/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel Virtio Over PCIe (VOP) driver.
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*
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*/
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#include <linux/sched.h>
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#include <linux/poll.h>
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#include <linux/dma-mapping.h>
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#include <linux/mic_common.h>
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#include "../common/mic_dev.h"
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#include <linux/mic_ioctl.h>
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#include "vop_main.h"
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/* Helper API to obtain the VOP PCIe device */
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static inline struct device *vop_dev(struct vop_vdev *vdev)
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{
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return vdev->vpdev->dev.parent;
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}
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/* Helper API to check if a virtio device is initialized */
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static inline int vop_vdev_inited(struct vop_vdev *vdev)
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{
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if (!vdev)
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return -EINVAL;
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/* Device has not been created yet */
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if (!vdev->dd || !vdev->dd->type) {
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dev_err(vop_dev(vdev), "%s %d err %d\n",
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__func__, __LINE__, -EINVAL);
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return -EINVAL;
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}
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/* Device has been removed/deleted */
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if (vdev->dd->type == -1) {
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dev_dbg(vop_dev(vdev), "%s %d err %d\n",
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__func__, __LINE__, -ENODEV);
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return -ENODEV;
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}
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return 0;
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}
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static void _vop_notify(struct vringh *vrh)
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{
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struct vop_vringh *vvrh = container_of(vrh, struct vop_vringh, vrh);
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struct vop_vdev *vdev = vvrh->vdev;
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struct vop_device *vpdev = vdev->vpdev;
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s8 db = vdev->dc->h2c_vdev_db;
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if (db != -1)
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vpdev->hw_ops->send_intr(vpdev, db);
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}
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static void vop_virtio_init_post(struct vop_vdev *vdev)
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{
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struct mic_vqconfig *vqconfig = mic_vq_config(vdev->dd);
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struct vop_device *vpdev = vdev->vpdev;
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int i, used_size;
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for (i = 0; i < vdev->dd->num_vq; i++) {
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used_size = PAGE_ALIGN(sizeof(u16) * 3 +
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sizeof(struct vring_used_elem) *
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le16_to_cpu(vqconfig->num));
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if (!le64_to_cpu(vqconfig[i].used_address)) {
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dev_warn(vop_dev(vdev), "used_address zero??\n");
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continue;
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}
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vdev->vvr[i].vrh.vring.used =
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(void __force *)vpdev->hw_ops->ioremap(
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vpdev,
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le64_to_cpu(vqconfig[i].used_address),
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used_size);
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}
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vdev->dc->used_address_updated = 0;
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dev_info(vop_dev(vdev), "%s: device type %d LINKUP\n",
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__func__, vdev->virtio_id);
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}
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static inline void vop_virtio_device_reset(struct vop_vdev *vdev)
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{
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int i;
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dev_dbg(vop_dev(vdev), "%s: status %d device type %d RESET\n",
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__func__, vdev->dd->status, vdev->virtio_id);
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for (i = 0; i < vdev->dd->num_vq; i++)
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/*
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* Avoid lockdep false positive. The + 1 is for the vop
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* mutex which is held in the reset devices code path.
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*/
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mutex_lock_nested(&vdev->vvr[i].vr_mutex, i + 1);
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/* 0 status means "reset" */
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vdev->dd->status = 0;
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vdev->dc->vdev_reset = 0;
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vdev->dc->host_ack = 1;
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for (i = 0; i < vdev->dd->num_vq; i++) {
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struct vringh *vrh = &vdev->vvr[i].vrh;
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vdev->vvr[i].vring.info->avail_idx = 0;
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vrh->completed = 0;
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vrh->last_avail_idx = 0;
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vrh->last_used_idx = 0;
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}
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for (i = 0; i < vdev->dd->num_vq; i++)
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mutex_unlock(&vdev->vvr[i].vr_mutex);
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}
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static void vop_virtio_reset_devices(struct vop_info *vi)
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{
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struct list_head *pos, *tmp;
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struct vop_vdev *vdev;
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list_for_each_safe(pos, tmp, &vi->vdev_list) {
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vdev = list_entry(pos, struct vop_vdev, list);
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vop_virtio_device_reset(vdev);
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vdev->poll_wake = 1;
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wake_up(&vdev->waitq);
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}
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}
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static void vop_bh_handler(struct work_struct *work)
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{
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struct vop_vdev *vdev = container_of(work, struct vop_vdev,
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virtio_bh_work);
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if (vdev->dc->used_address_updated)
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vop_virtio_init_post(vdev);
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if (vdev->dc->vdev_reset)
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vop_virtio_device_reset(vdev);
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vdev->poll_wake = 1;
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wake_up(&vdev->waitq);
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}
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static irqreturn_t _vop_virtio_intr_handler(int irq, void *data)
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{
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struct vop_vdev *vdev = data;
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struct vop_device *vpdev = vdev->vpdev;
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vpdev->hw_ops->ack_interrupt(vpdev, vdev->virtio_db);
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schedule_work(&vdev->virtio_bh_work);
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return IRQ_HANDLED;
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}
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static int vop_virtio_config_change(struct vop_vdev *vdev, void *argp)
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{
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DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
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int ret = 0, retry, i;
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struct vop_device *vpdev = vdev->vpdev;
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struct vop_info *vi = dev_get_drvdata(&vpdev->dev);
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struct mic_bootparam *bootparam = vpdev->hw_ops->get_dp(vpdev);
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s8 db = bootparam->h2c_config_db;
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mutex_lock(&vi->vop_mutex);
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for (i = 0; i < vdev->dd->num_vq; i++)
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mutex_lock_nested(&vdev->vvr[i].vr_mutex, i + 1);
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if (db == -1 || vdev->dd->type == -1) {
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ret = -EIO;
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goto exit;
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}
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memcpy(mic_vq_configspace(vdev->dd), argp, vdev->dd->config_len);
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vdev->dc->config_change = MIC_VIRTIO_PARAM_CONFIG_CHANGED;
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vpdev->hw_ops->send_intr(vpdev, db);
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for (retry = 100; retry--;) {
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ret = wait_event_timeout(wake, vdev->dc->guest_ack,
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msecs_to_jiffies(100));
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if (ret)
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break;
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}
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dev_dbg(vop_dev(vdev),
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"%s %d retry: %d\n", __func__, __LINE__, retry);
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vdev->dc->config_change = 0;
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vdev->dc->guest_ack = 0;
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exit:
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for (i = 0; i < vdev->dd->num_vq; i++)
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mutex_unlock(&vdev->vvr[i].vr_mutex);
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mutex_unlock(&vi->vop_mutex);
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return ret;
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}
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static int vop_copy_dp_entry(struct vop_vdev *vdev,
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struct mic_device_desc *argp, __u8 *type,
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struct mic_device_desc **devpage)
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{
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struct vop_device *vpdev = vdev->vpdev;
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struct mic_device_desc *devp;
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struct mic_vqconfig *vqconfig;
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int ret = 0, i;
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bool slot_found = false;
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vqconfig = mic_vq_config(argp);
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for (i = 0; i < argp->num_vq; i++) {
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if (le16_to_cpu(vqconfig[i].num) > MIC_MAX_VRING_ENTRIES) {
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ret = -EINVAL;
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dev_err(vop_dev(vdev), "%s %d err %d\n",
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__func__, __LINE__, ret);
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goto exit;
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}
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}
|
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|
|
||
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/* Find the first free device page entry */
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for (i = sizeof(struct mic_bootparam);
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i < MIC_DP_SIZE - mic_total_desc_size(argp);
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i += mic_total_desc_size(devp)) {
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devp = vpdev->hw_ops->get_dp(vpdev) + i;
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if (devp->type == 0 || devp->type == -1) {
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slot_found = true;
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break;
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}
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}
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if (!slot_found) {
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ret = -EINVAL;
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dev_err(vop_dev(vdev), "%s %d err %d\n",
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__func__, __LINE__, ret);
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goto exit;
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}
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/*
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||
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* Save off the type before doing the memcpy. Type will be set in the
|
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* end after completing all initialization for the new device.
|
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*/
|
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*type = argp->type;
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argp->type = 0;
|
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memcpy(devp, argp, mic_desc_size(argp));
|
||
|
|
||
|
*devpage = devp;
|
||
|
exit:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
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static void vop_init_device_ctrl(struct vop_vdev *vdev,
|
||
|
struct mic_device_desc *devpage)
|
||
|
{
|
||
|
struct mic_device_ctrl *dc;
|
||
|
|
||
|
dc = (void *)devpage + mic_aligned_desc_size(devpage);
|
||
|
|
||
|
dc->config_change = 0;
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||
|
dc->guest_ack = 0;
|
||
|
dc->vdev_reset = 0;
|
||
|
dc->host_ack = 0;
|
||
|
dc->used_address_updated = 0;
|
||
|
dc->c2h_vdev_db = -1;
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|
dc->h2c_vdev_db = -1;
|
||
|
vdev->dc = dc;
|
||
|
}
|
||
|
|
||
|
static int vop_virtio_add_device(struct vop_vdev *vdev,
|
||
|
struct mic_device_desc *argp)
|
||
|
{
|
||
|
struct vop_info *vi = vdev->vi;
|
||
|
struct vop_device *vpdev = vi->vpdev;
|
||
|
struct mic_device_desc *dd = NULL;
|
||
|
struct mic_vqconfig *vqconfig;
|
||
|
int vr_size, i, j, ret;
|
||
|
u8 type = 0;
|
||
|
s8 db = -1;
|
||
|
char irqname[16];
|
||
|
struct mic_bootparam *bootparam;
|
||
|
u16 num;
|
||
|
dma_addr_t vr_addr;
|
||
|
|
||
|
bootparam = vpdev->hw_ops->get_dp(vpdev);
|
||
|
init_waitqueue_head(&vdev->waitq);
|
||
|
INIT_LIST_HEAD(&vdev->list);
|
||
|
vdev->vpdev = vpdev;
|
||
|
|
||
|
ret = vop_copy_dp_entry(vdev, argp, &type, &dd);
|
||
|
if (ret) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
vop_init_device_ctrl(vdev, dd);
|
||
|
|
||
|
vdev->dd = dd;
|
||
|
vdev->virtio_id = type;
|
||
|
vqconfig = mic_vq_config(dd);
|
||
|
INIT_WORK(&vdev->virtio_bh_work, vop_bh_handler);
|
||
|
|
||
|
for (i = 0; i < dd->num_vq; i++) {
|
||
|
struct vop_vringh *vvr = &vdev->vvr[i];
|
||
|
struct mic_vring *vr = &vdev->vvr[i].vring;
|
||
|
|
||
|
num = le16_to_cpu(vqconfig[i].num);
|
||
|
mutex_init(&vvr->vr_mutex);
|
||
|
vr_size = PAGE_ALIGN(round_up(vring_size(num, MIC_VIRTIO_RING_ALIGN), 4) +
|
||
|
sizeof(struct _mic_vring_info));
|
||
|
vr->va = (void *)
|
||
|
__get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
||
|
get_order(vr_size));
|
||
|
if (!vr->va) {
|
||
|
ret = -ENOMEM;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
goto err;
|
||
|
}
|
||
|
vr->len = vr_size;
|
||
|
vr->info = vr->va + round_up(vring_size(num, MIC_VIRTIO_RING_ALIGN), 4);
|
||
|
vr->info->magic = cpu_to_le32(MIC_MAGIC + vdev->virtio_id + i);
|
||
|
vr_addr = dma_map_single(&vpdev->dev, vr->va, vr_size,
|
||
|
DMA_BIDIRECTIONAL);
|
||
|
if (dma_mapping_error(&vpdev->dev, vr_addr)) {
|
||
|
free_pages((unsigned long)vr->va, get_order(vr_size));
|
||
|
ret = -ENOMEM;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
goto err;
|
||
|
}
|
||
|
vqconfig[i].address = cpu_to_le64(vr_addr);
|
||
|
|
||
|
vring_init(&vr->vr, num, vr->va, MIC_VIRTIO_RING_ALIGN);
|
||
|
ret = vringh_init_kern(&vvr->vrh,
|
||
|
*(u32 *)mic_vq_features(vdev->dd),
|
||
|
num, false, vr->vr.desc, vr->vr.avail,
|
||
|
vr->vr.used);
|
||
|
if (ret) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
goto err;
|
||
|
}
|
||
|
vringh_kiov_init(&vvr->riov, NULL, 0);
|
||
|
vringh_kiov_init(&vvr->wiov, NULL, 0);
|
||
|
vvr->head = USHRT_MAX;
|
||
|
vvr->vdev = vdev;
|
||
|
vvr->vrh.notify = _vop_notify;
|
||
|
dev_dbg(&vpdev->dev,
|
||
|
"%s %d index %d va %p info %p vr_size 0x%x\n",
|
||
|
__func__, __LINE__, i, vr->va, vr->info, vr_size);
|
||
|
vvr->buf = (void *)__get_free_pages(GFP_KERNEL,
|
||
|
get_order(VOP_INT_DMA_BUF_SIZE));
|
||
|
vvr->buf_da = dma_map_single(&vpdev->dev,
|
||
|
vvr->buf, VOP_INT_DMA_BUF_SIZE,
|
||
|
DMA_BIDIRECTIONAL);
|
||
|
}
|
||
|
|
||
|
snprintf(irqname, sizeof(irqname), "vop%dvirtio%d", vpdev->index,
|
||
|
vdev->virtio_id);
|
||
|
vdev->virtio_db = vpdev->hw_ops->next_db(vpdev);
|
||
|
vdev->virtio_cookie = vpdev->hw_ops->request_irq(vpdev,
|
||
|
_vop_virtio_intr_handler, irqname, vdev,
|
||
|
vdev->virtio_db);
|
||
|
if (IS_ERR(vdev->virtio_cookie)) {
|
||
|
ret = PTR_ERR(vdev->virtio_cookie);
|
||
|
dev_dbg(&vpdev->dev, "request irq failed\n");
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
vdev->dc->c2h_vdev_db = vdev->virtio_db;
|
||
|
|
||
|
/*
|
||
|
* Order the type update with previous stores. This write barrier
|
||
|
* is paired with the corresponding read barrier before the uncached
|
||
|
* system memory read of the type, on the card while scanning the
|
||
|
* device page.
|
||
|
*/
|
||
|
smp_wmb();
|
||
|
dd->type = type;
|
||
|
argp->type = type;
|
||
|
|
||
|
if (bootparam) {
|
||
|
db = bootparam->h2c_config_db;
|
||
|
if (db != -1)
|
||
|
vpdev->hw_ops->send_intr(vpdev, db);
|
||
|
}
|
||
|
dev_dbg(&vpdev->dev, "Added virtio id %d db %d\n", dd->type, db);
|
||
|
return 0;
|
||
|
err:
|
||
|
vqconfig = mic_vq_config(dd);
|
||
|
for (j = 0; j < i; j++) {
|
||
|
struct vop_vringh *vvr = &vdev->vvr[j];
|
||
|
|
||
|
dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[j].address),
|
||
|
vvr->vring.len, DMA_BIDIRECTIONAL);
|
||
|
free_pages((unsigned long)vvr->vring.va,
|
||
|
get_order(vvr->vring.len));
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static void vop_dev_remove(struct vop_info *pvi, struct mic_device_ctrl *devp,
|
||
|
struct vop_device *vpdev)
|
||
|
{
|
||
|
struct mic_bootparam *bootparam = vpdev->hw_ops->get_dp(vpdev);
|
||
|
s8 db;
|
||
|
int ret, retry;
|
||
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
|
||
|
|
||
|
devp->config_change = MIC_VIRTIO_PARAM_DEV_REMOVE;
|
||
|
db = bootparam->h2c_config_db;
|
||
|
if (db != -1)
|
||
|
vpdev->hw_ops->send_intr(vpdev, db);
|
||
|
else
|
||
|
goto done;
|
||
|
for (retry = 15; retry--;) {
|
||
|
ret = wait_event_timeout(wake, devp->guest_ack,
|
||
|
msecs_to_jiffies(1000));
|
||
|
if (ret)
|
||
|
break;
|
||
|
}
|
||
|
done:
|
||
|
devp->config_change = 0;
|
||
|
devp->guest_ack = 0;
|
||
|
}
|
||
|
|
||
|
static void vop_virtio_del_device(struct vop_vdev *vdev)
|
||
|
{
|
||
|
struct vop_info *vi = vdev->vi;
|
||
|
struct vop_device *vpdev = vdev->vpdev;
|
||
|
int i;
|
||
|
struct mic_vqconfig *vqconfig;
|
||
|
struct mic_bootparam *bootparam = vpdev->hw_ops->get_dp(vpdev);
|
||
|
|
||
|
if (!bootparam)
|
||
|
goto skip_hot_remove;
|
||
|
vop_dev_remove(vi, vdev->dc, vpdev);
|
||
|
skip_hot_remove:
|
||
|
vpdev->hw_ops->free_irq(vpdev, vdev->virtio_cookie, vdev);
|
||
|
flush_work(&vdev->virtio_bh_work);
|
||
|
vqconfig = mic_vq_config(vdev->dd);
|
||
|
for (i = 0; i < vdev->dd->num_vq; i++) {
|
||
|
struct vop_vringh *vvr = &vdev->vvr[i];
|
||
|
|
||
|
dma_unmap_single(&vpdev->dev,
|
||
|
vvr->buf_da, VOP_INT_DMA_BUF_SIZE,
|
||
|
DMA_BIDIRECTIONAL);
|
||
|
free_pages((unsigned long)vvr->buf,
|
||
|
get_order(VOP_INT_DMA_BUF_SIZE));
|
||
|
vringh_kiov_cleanup(&vvr->riov);
|
||
|
vringh_kiov_cleanup(&vvr->wiov);
|
||
|
dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[i].address),
|
||
|
vvr->vring.len, DMA_BIDIRECTIONAL);
|
||
|
free_pages((unsigned long)vvr->vring.va,
|
||
|
get_order(vvr->vring.len));
|
||
|
}
|
||
|
/*
|
||
|
* Order the type update with previous stores. This write barrier
|
||
|
* is paired with the corresponding read barrier before the uncached
|
||
|
* system memory read of the type, on the card while scanning the
|
||
|
* device page.
|
||
|
*/
|
||
|
smp_wmb();
|
||
|
vdev->dd->type = -1;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* vop_sync_dma - Wrapper for synchronous DMAs.
|
||
|
*
|
||
|
* @dev - The address of the pointer to the device instance used
|
||
|
* for DMA registration.
|
||
|
* @dst - destination DMA address.
|
||
|
* @src - source DMA address.
|
||
|
* @len - size of the transfer.
|
||
|
*
|
||
|
* Return DMA_SUCCESS on success
|
||
|
*/
|
||
|
static int vop_sync_dma(struct vop_vdev *vdev, dma_addr_t dst, dma_addr_t src,
|
||
|
size_t len)
|
||
|
{
|
||
|
int err = 0;
|
||
|
struct dma_device *ddev;
|
||
|
struct dma_async_tx_descriptor *tx;
|
||
|
struct vop_info *vi = dev_get_drvdata(&vdev->vpdev->dev);
|
||
|
struct dma_chan *vop_ch = vi->dma_ch;
|
||
|
|
||
|
if (!vop_ch) {
|
||
|
err = -EBUSY;
|
||
|
goto error;
|
||
|
}
|
||
|
ddev = vop_ch->device;
|
||
|
tx = ddev->device_prep_dma_memcpy(vop_ch, dst, src, len,
|
||
|
DMA_PREP_FENCE);
|
||
|
if (!tx) {
|
||
|
err = -ENOMEM;
|
||
|
goto error;
|
||
|
} else {
|
||
|
dma_cookie_t cookie;
|
||
|
|
||
|
cookie = tx->tx_submit(tx);
|
||
|
if (dma_submit_error(cookie)) {
|
||
|
err = -ENOMEM;
|
||
|
goto error;
|
||
|
}
|
||
|
dma_async_issue_pending(vop_ch);
|
||
|
err = dma_sync_wait(vop_ch, cookie);
|
||
|
}
|
||
|
error:
|
||
|
if (err)
|
||
|
dev_err(&vi->vpdev->dev, "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
#define VOP_USE_DMA true
|
||
|
|
||
|
/*
|
||
|
* Initiates the copies across the PCIe bus from card memory to a user
|
||
|
* space buffer. When transfers are done using DMA, source/destination
|
||
|
* addresses and transfer length must follow the alignment requirements of
|
||
|
* the MIC DMA engine.
|
||
|
*/
|
||
|
static int vop_virtio_copy_to_user(struct vop_vdev *vdev, void __user *ubuf,
|
||
|
size_t len, u64 daddr, size_t dlen,
|
||
|
int vr_idx)
|
||
|
{
|
||
|
struct vop_device *vpdev = vdev->vpdev;
|
||
|
void __iomem *dbuf = vpdev->hw_ops->ioremap(vpdev, daddr, len);
|
||
|
struct vop_vringh *vvr = &vdev->vvr[vr_idx];
|
||
|
struct vop_info *vi = dev_get_drvdata(&vpdev->dev);
|
||
|
size_t dma_alignment = 1 << vi->dma_ch->device->copy_align;
|
||
|
bool x200 = is_dma_copy_aligned(vi->dma_ch->device, 1, 1, 1);
|
||
|
size_t dma_offset, partlen;
|
||
|
int err;
|
||
|
|
||
|
if (!VOP_USE_DMA) {
|
||
|
if (copy_to_user(ubuf, (void __force *)dbuf, len)) {
|
||
|
err = -EFAULT;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
vdev->in_bytes += len;
|
||
|
err = 0;
|
||
|
goto err;
|
||
|
}
|
||
|
|
||
|
dma_offset = daddr - round_down(daddr, dma_alignment);
|
||
|
daddr -= dma_offset;
|
||
|
len += dma_offset;
|
||
|
/*
|
||
|
* X100 uses DMA addresses as seen by the card so adding
|
||
|
* the aperture base is not required for DMA. However x200
|
||
|
* requires DMA addresses to be an offset into the bar so
|
||
|
* add the aperture base for x200.
|
||
|
*/
|
||
|
if (x200)
|
||
|
daddr += vpdev->aper->pa;
|
||
|
while (len) {
|
||
|
partlen = min_t(size_t, len, VOP_INT_DMA_BUF_SIZE);
|
||
|
err = vop_sync_dma(vdev, vvr->buf_da, daddr,
|
||
|
ALIGN(partlen, dma_alignment));
|
||
|
if (err) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
if (copy_to_user(ubuf, vvr->buf + dma_offset,
|
||
|
partlen - dma_offset)) {
|
||
|
err = -EFAULT;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
daddr += partlen;
|
||
|
ubuf += partlen;
|
||
|
dbuf += partlen;
|
||
|
vdev->in_bytes_dma += partlen;
|
||
|
vdev->in_bytes += partlen;
|
||
|
len -= partlen;
|
||
|
dma_offset = 0;
|
||
|
}
|
||
|
err = 0;
|
||
|
err:
|
||
|
vpdev->hw_ops->iounmap(vpdev, dbuf);
|
||
|
dev_dbg(vop_dev(vdev),
|
||
|
"%s: ubuf %p dbuf %p len 0x%lx vr_idx 0x%x\n",
|
||
|
__func__, ubuf, dbuf, len, vr_idx);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Initiates copies across the PCIe bus from a user space buffer to card
|
||
|
* memory. When transfers are done using DMA, source/destination addresses
|
||
|
* and transfer length must follow the alignment requirements of the MIC
|
||
|
* DMA engine.
|
||
|
*/
|
||
|
static int vop_virtio_copy_from_user(struct vop_vdev *vdev, void __user *ubuf,
|
||
|
size_t len, u64 daddr, size_t dlen,
|
||
|
int vr_idx)
|
||
|
{
|
||
|
struct vop_device *vpdev = vdev->vpdev;
|
||
|
void __iomem *dbuf = vpdev->hw_ops->ioremap(vpdev, daddr, len);
|
||
|
struct vop_vringh *vvr = &vdev->vvr[vr_idx];
|
||
|
struct vop_info *vi = dev_get_drvdata(&vdev->vpdev->dev);
|
||
|
size_t dma_alignment = 1 << vi->dma_ch->device->copy_align;
|
||
|
bool x200 = is_dma_copy_aligned(vi->dma_ch->device, 1, 1, 1);
|
||
|
size_t partlen;
|
||
|
bool dma = VOP_USE_DMA;
|
||
|
int err = 0;
|
||
|
size_t offset = 0;
|
||
|
|
||
|
if (daddr & (dma_alignment - 1)) {
|
||
|
vdev->tx_dst_unaligned += len;
|
||
|
dma = false;
|
||
|
} else if (ALIGN(len, dma_alignment) > dlen) {
|
||
|
vdev->tx_len_unaligned += len;
|
||
|
dma = false;
|
||
|
}
|
||
|
|
||
|
if (!dma)
|
||
|
goto memcpy;
|
||
|
|
||
|
/*
|
||
|
* X100 uses DMA addresses as seen by the card so adding
|
||
|
* the aperture base is not required for DMA. However x200
|
||
|
* requires DMA addresses to be an offset into the bar so
|
||
|
* add the aperture base for x200.
|
||
|
*/
|
||
|
if (x200)
|
||
|
daddr += vpdev->aper->pa;
|
||
|
while (len) {
|
||
|
partlen = min_t(size_t, len, VOP_INT_DMA_BUF_SIZE);
|
||
|
|
||
|
if (copy_from_user(vvr->buf, ubuf, partlen)) {
|
||
|
err = -EFAULT;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
err = vop_sync_dma(vdev, daddr, vvr->buf_da,
|
||
|
ALIGN(partlen, dma_alignment));
|
||
|
if (err) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
daddr += partlen;
|
||
|
ubuf += partlen;
|
||
|
dbuf += partlen;
|
||
|
vdev->out_bytes_dma += partlen;
|
||
|
vdev->out_bytes += partlen;
|
||
|
len -= partlen;
|
||
|
}
|
||
|
memcpy:
|
||
|
/*
|
||
|
* We are copying to IO below and should ideally use something
|
||
|
* like copy_from_user_toio(..) if it existed.
|
||
|
*/
|
||
|
while (len) {
|
||
|
partlen = min_t(size_t, len, VOP_INT_DMA_BUF_SIZE);
|
||
|
|
||
|
if (copy_from_user(vvr->buf, ubuf + offset, partlen)) {
|
||
|
err = -EFAULT;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
memcpy_toio(dbuf + offset, vvr->buf, partlen);
|
||
|
offset += partlen;
|
||
|
vdev->out_bytes += partlen;
|
||
|
len -= partlen;
|
||
|
}
|
||
|
err = 0;
|
||
|
err:
|
||
|
vpdev->hw_ops->iounmap(vpdev, dbuf);
|
||
|
dev_dbg(vop_dev(vdev),
|
||
|
"%s: ubuf %p dbuf %p len 0x%lx vr_idx 0x%x\n",
|
||
|
__func__, ubuf, dbuf, len, vr_idx);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
#define MIC_VRINGH_READ true
|
||
|
|
||
|
/* Determine the total number of bytes consumed in a VRINGH KIOV */
|
||
|
static inline u32 vop_vringh_iov_consumed(struct vringh_kiov *iov)
|
||
|
{
|
||
|
int i;
|
||
|
u32 total = iov->consumed;
|
||
|
|
||
|
for (i = 0; i < iov->i; i++)
|
||
|
total += iov->iov[i].iov_len;
|
||
|
return total;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Traverse the VRINGH KIOV and issue the APIs to trigger the copies.
|
||
|
* This API is heavily based on the vringh_iov_xfer(..) implementation
|
||
|
* in vringh.c. The reason we cannot reuse vringh_iov_pull_kern(..)
|
||
|
* and vringh_iov_push_kern(..) directly is because there is no
|
||
|
* way to override the VRINGH xfer(..) routines as of v3.10.
|
||
|
*/
|
||
|
static int vop_vringh_copy(struct vop_vdev *vdev, struct vringh_kiov *iov,
|
||
|
void __user *ubuf, size_t len, bool read, int vr_idx,
|
||
|
size_t *out_len)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
size_t partlen, tot_len = 0;
|
||
|
|
||
|
while (len && iov->i < iov->used) {
|
||
|
struct kvec *kiov = &iov->iov[iov->i];
|
||
|
|
||
|
partlen = min(kiov->iov_len, len);
|
||
|
if (read)
|
||
|
ret = vop_virtio_copy_to_user(vdev, ubuf, partlen,
|
||
|
(u64)kiov->iov_base,
|
||
|
kiov->iov_len,
|
||
|
vr_idx);
|
||
|
else
|
||
|
ret = vop_virtio_copy_from_user(vdev, ubuf, partlen,
|
||
|
(u64)kiov->iov_base,
|
||
|
kiov->iov_len,
|
||
|
vr_idx);
|
||
|
if (ret) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
break;
|
||
|
}
|
||
|
len -= partlen;
|
||
|
ubuf += partlen;
|
||
|
tot_len += partlen;
|
||
|
iov->consumed += partlen;
|
||
|
kiov->iov_len -= partlen;
|
||
|
kiov->iov_base += partlen;
|
||
|
if (!kiov->iov_len) {
|
||
|
/* Fix up old iov element then increment. */
|
||
|
kiov->iov_len = iov->consumed;
|
||
|
kiov->iov_base -= iov->consumed;
|
||
|
|
||
|
iov->consumed = 0;
|
||
|
iov->i++;
|
||
|
}
|
||
|
}
|
||
|
*out_len = tot_len;
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Use the standard VRINGH infrastructure in the kernel to fetch new
|
||
|
* descriptors, initiate the copies and update the used ring.
|
||
|
*/
|
||
|
static int _vop_virtio_copy(struct vop_vdev *vdev, struct mic_copy_desc *copy)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
u32 iovcnt = copy->iovcnt;
|
||
|
struct iovec iov;
|
||
|
struct iovec __user *u_iov = copy->iov;
|
||
|
void __user *ubuf = NULL;
|
||
|
struct vop_vringh *vvr = &vdev->vvr[copy->vr_idx];
|
||
|
struct vringh_kiov *riov = &vvr->riov;
|
||
|
struct vringh_kiov *wiov = &vvr->wiov;
|
||
|
struct vringh *vrh = &vvr->vrh;
|
||
|
u16 *head = &vvr->head;
|
||
|
struct mic_vring *vr = &vvr->vring;
|
||
|
size_t len = 0, out_len;
|
||
|
|
||
|
copy->out_len = 0;
|
||
|
/* Fetch a new IOVEC if all previous elements have been processed */
|
||
|
if (riov->i == riov->used && wiov->i == wiov->used) {
|
||
|
ret = vringh_getdesc_kern(vrh, riov, wiov,
|
||
|
head, GFP_KERNEL);
|
||
|
/* Check if there are available descriptors */
|
||
|
if (ret <= 0)
|
||
|
return ret;
|
||
|
}
|
||
|
while (iovcnt) {
|
||
|
if (!len) {
|
||
|
/* Copy over a new iovec from user space. */
|
||
|
ret = copy_from_user(&iov, u_iov, sizeof(*u_iov));
|
||
|
if (ret) {
|
||
|
ret = -EINVAL;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
break;
|
||
|
}
|
||
|
len = iov.iov_len;
|
||
|
ubuf = iov.iov_base;
|
||
|
}
|
||
|
/* Issue all the read descriptors first */
|
||
|
ret = vop_vringh_copy(vdev, riov, ubuf, len,
|
||
|
MIC_VRINGH_READ, copy->vr_idx, &out_len);
|
||
|
if (ret) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
break;
|
||
|
}
|
||
|
len -= out_len;
|
||
|
ubuf += out_len;
|
||
|
copy->out_len += out_len;
|
||
|
/* Issue the write descriptors next */
|
||
|
ret = vop_vringh_copy(vdev, wiov, ubuf, len,
|
||
|
!MIC_VRINGH_READ, copy->vr_idx, &out_len);
|
||
|
if (ret) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, ret);
|
||
|
break;
|
||
|
}
|
||
|
len -= out_len;
|
||
|
ubuf += out_len;
|
||
|
copy->out_len += out_len;
|
||
|
if (!len) {
|
||
|
/* One user space iovec is now completed */
|
||
|
iovcnt--;
|
||
|
u_iov++;
|
||
|
}
|
||
|
/* Exit loop if all elements in KIOVs have been processed. */
|
||
|
if (riov->i == riov->used && wiov->i == wiov->used)
|
||
|
break;
|
||
|
}
|
||
|
/*
|
||
|
* Update the used ring if a descriptor was available and some data was
|
||
|
* copied in/out and the user asked for a used ring update.
|
||
|
*/
|
||
|
if (*head != USHRT_MAX && copy->out_len && copy->update_used) {
|
||
|
u32 total = 0;
|
||
|
|
||
|
/* Determine the total data consumed */
|
||
|
total += vop_vringh_iov_consumed(riov);
|
||
|
total += vop_vringh_iov_consumed(wiov);
|
||
|
vringh_complete_kern(vrh, *head, total);
|
||
|
*head = USHRT_MAX;
|
||
|
if (vringh_need_notify_kern(vrh) > 0)
|
||
|
vringh_notify(vrh);
|
||
|
vringh_kiov_cleanup(riov);
|
||
|
vringh_kiov_cleanup(wiov);
|
||
|
/* Update avail idx for user space */
|
||
|
vr->info->avail_idx = vrh->last_avail_idx;
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static inline int vop_verify_copy_args(struct vop_vdev *vdev,
|
||
|
struct mic_copy_desc *copy)
|
||
|
{
|
||
|
if (!vdev || copy->vr_idx >= vdev->dd->num_vq)
|
||
|
return -EINVAL;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Copy a specified number of virtio descriptors in a chain */
|
||
|
static int vop_virtio_copy_desc(struct vop_vdev *vdev,
|
||
|
struct mic_copy_desc *copy)
|
||
|
{
|
||
|
int err;
|
||
|
struct vop_vringh *vvr;
|
||
|
|
||
|
err = vop_verify_copy_args(vdev, copy);
|
||
|
if (err)
|
||
|
return err;
|
||
|
|
||
|
vvr = &vdev->vvr[copy->vr_idx];
|
||
|
mutex_lock(&vvr->vr_mutex);
|
||
|
if (!vop_vdevup(vdev)) {
|
||
|
err = -ENODEV;
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
goto err;
|
||
|
}
|
||
|
err = _vop_virtio_copy(vdev, copy);
|
||
|
if (err) {
|
||
|
dev_err(vop_dev(vdev), "%s %d err %d\n",
|
||
|
__func__, __LINE__, err);
|
||
|
}
|
||
|
err:
|
||
|
mutex_unlock(&vvr->vr_mutex);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
static int vop_open(struct inode *inode, struct file *f)
|
||
|
{
|
||
|
struct vop_vdev *vdev;
|
||
|
struct vop_info *vi = container_of(f->private_data,
|
||
|
struct vop_info, miscdev);
|
||
|
|
||
|
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
|
||
|
if (!vdev)
|
||
|
return -ENOMEM;
|
||
|
vdev->vi = vi;
|
||
|
mutex_init(&vdev->vdev_mutex);
|
||
|
f->private_data = vdev;
|
||
|
init_completion(&vdev->destroy);
|
||
|
complete(&vdev->destroy);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int vop_release(struct inode *inode, struct file *f)
|
||
|
{
|
||
|
struct vop_vdev *vdev = f->private_data, *vdev_tmp;
|
||
|
struct vop_info *vi = vdev->vi;
|
||
|
struct list_head *pos, *tmp;
|
||
|
bool found = false;
|
||
|
|
||
|
mutex_lock(&vdev->vdev_mutex);
|
||
|
if (vdev->deleted)
|
||
|
goto unlock;
|
||
|
mutex_lock(&vi->vop_mutex);
|
||
|
list_for_each_safe(pos, tmp, &vi->vdev_list) {
|
||
|
vdev_tmp = list_entry(pos, struct vop_vdev, list);
|
||
|
if (vdev == vdev_tmp) {
|
||
|
vop_virtio_del_device(vdev);
|
||
|
list_del(pos);
|
||
|
found = true;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
mutex_unlock(&vi->vop_mutex);
|
||
|
unlock:
|
||
|
mutex_unlock(&vdev->vdev_mutex);
|
||
|
if (!found)
|
||
|
wait_for_completion(&vdev->destroy);
|
||
|
f->private_data = NULL;
|
||
|
kfree(vdev);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static long vop_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
|
||
|
{
|
||
|
struct vop_vdev *vdev = f->private_data;
|
||
|
struct vop_info *vi = vdev->vi;
|
||
|
void __user *argp = (void __user *)arg;
|
||
|
int ret;
|
||
|
|
||
|
switch (cmd) {
|
||
|
case MIC_VIRTIO_ADD_DEVICE:
|
||
|
{
|
||
|
struct mic_device_desc dd, *dd_config;
|
||
|
|
||
|
if (copy_from_user(&dd, argp, sizeof(dd)))
|
||
|
return -EFAULT;
|
||
|
|
||
|
if (mic_aligned_desc_size(&dd) > MIC_MAX_DESC_BLK_SIZE ||
|
||
|
dd.num_vq > MIC_MAX_VRINGS)
|
||
|
return -EINVAL;
|
||
|
|
||
|
dd_config = kzalloc(mic_desc_size(&dd), GFP_KERNEL);
|
||
|
if (!dd_config)
|
||
|
return -ENOMEM;
|
||
|
if (copy_from_user(dd_config, argp, mic_desc_size(&dd))) {
|
||
|
ret = -EFAULT;
|
||
|
goto free_ret;
|
||
|
}
|
||
|
/* Ensure desc has not changed between the two reads */
|
||
|
if (memcmp(&dd, dd_config, sizeof(dd))) {
|
||
|
ret = -EINVAL;
|
||
|
goto free_ret;
|
||
|
}
|
||
|
mutex_lock(&vdev->vdev_mutex);
|
||
|
mutex_lock(&vi->vop_mutex);
|
||
|
ret = vop_virtio_add_device(vdev, dd_config);
|
||
|
if (ret)
|
||
|
goto unlock_ret;
|
||
|
list_add_tail(&vdev->list, &vi->vdev_list);
|
||
|
unlock_ret:
|
||
|
mutex_unlock(&vi->vop_mutex);
|
||
|
mutex_unlock(&vdev->vdev_mutex);
|
||
|
free_ret:
|
||
|
kfree(dd_config);
|
||
|
return ret;
|
||
|
}
|
||
|
case MIC_VIRTIO_COPY_DESC:
|
||
|
{
|
||
|
struct mic_copy_desc copy;
|
||
|
|
||
|
mutex_lock(&vdev->vdev_mutex);
|
||
|
ret = vop_vdev_inited(vdev);
|
||
|
if (ret)
|
||
|
goto _unlock_ret;
|
||
|
|
||
|
if (copy_from_user(©, argp, sizeof(copy))) {
|
||
|
ret = -EFAULT;
|
||
|
goto _unlock_ret;
|
||
|
}
|
||
|
|
||
|
ret = vop_virtio_copy_desc(vdev, ©);
|
||
|
if (ret < 0)
|
||
|
goto _unlock_ret;
|
||
|
if (copy_to_user(
|
||
|
&((struct mic_copy_desc __user *)argp)->out_len,
|
||
|
©.out_len, sizeof(copy.out_len)))
|
||
|
ret = -EFAULT;
|
||
|
_unlock_ret:
|
||
|
mutex_unlock(&vdev->vdev_mutex);
|
||
|
return ret;
|
||
|
}
|
||
|
case MIC_VIRTIO_CONFIG_CHANGE:
|
||
|
{
|
||
|
void *buf;
|
||
|
|
||
|
mutex_lock(&vdev->vdev_mutex);
|
||
|
ret = vop_vdev_inited(vdev);
|
||
|
if (ret)
|
||
|
goto __unlock_ret;
|
||
|
buf = kzalloc(vdev->dd->config_len, GFP_KERNEL);
|
||
|
if (!buf) {
|
||
|
ret = -ENOMEM;
|
||
|
goto __unlock_ret;
|
||
|
}
|
||
|
if (copy_from_user(buf, argp, vdev->dd->config_len)) {
|
||
|
ret = -EFAULT;
|
||
|
goto done;
|
||
|
}
|
||
|
ret = vop_virtio_config_change(vdev, buf);
|
||
|
done:
|
||
|
kfree(buf);
|
||
|
__unlock_ret:
|
||
|
mutex_unlock(&vdev->vdev_mutex);
|
||
|
return ret;
|
||
|
}
|
||
|
default:
|
||
|
return -ENOIOCTLCMD;
|
||
|
};
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We return POLLIN | POLLOUT from poll when new buffers are enqueued, and
|
||
|
* not when previously enqueued buffers may be available. This means that
|
||
|
* in the card->host (TX) path, when userspace is unblocked by poll it
|
||
|
* must drain all available descriptors or it can stall.
|
||
|
*/
|
||
|
static unsigned int vop_poll(struct file *f, poll_table *wait)
|
||
|
{
|
||
|
struct vop_vdev *vdev = f->private_data;
|
||
|
int mask = 0;
|
||
|
|
||
|
mutex_lock(&vdev->vdev_mutex);
|
||
|
if (vop_vdev_inited(vdev)) {
|
||
|
mask = POLLERR;
|
||
|
goto done;
|
||
|
}
|
||
|
poll_wait(f, &vdev->waitq, wait);
|
||
|
if (vop_vdev_inited(vdev)) {
|
||
|
mask = POLLERR;
|
||
|
} else if (vdev->poll_wake) {
|
||
|
vdev->poll_wake = 0;
|
||
|
mask = POLLIN | POLLOUT;
|
||
|
}
|
||
|
done:
|
||
|
mutex_unlock(&vdev->vdev_mutex);
|
||
|
return mask;
|
||
|
}
|
||
|
|
||
|
static inline int
|
||
|
vop_query_offset(struct vop_vdev *vdev, unsigned long offset,
|
||
|
unsigned long *size, unsigned long *pa)
|
||
|
{
|
||
|
struct vop_device *vpdev = vdev->vpdev;
|
||
|
unsigned long start = MIC_DP_SIZE;
|
||
|
int i;
|
||
|
|
||
|
/*
|
||
|
* MMAP interface is as follows:
|
||
|
* offset region
|
||
|
* 0x0 virtio device_page
|
||
|
* 0x1000 first vring
|
||
|
* 0x1000 + size of 1st vring second vring
|
||
|
* ....
|
||
|
*/
|
||
|
if (!offset) {
|
||
|
*pa = virt_to_phys(vpdev->hw_ops->get_dp(vpdev));
|
||
|
*size = MIC_DP_SIZE;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < vdev->dd->num_vq; i++) {
|
||
|
struct vop_vringh *vvr = &vdev->vvr[i];
|
||
|
|
||
|
if (offset == start) {
|
||
|
*pa = virt_to_phys(vvr->vring.va);
|
||
|
*size = vvr->vring.len;
|
||
|
return 0;
|
||
|
}
|
||
|
start += vvr->vring.len;
|
||
|
}
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Maps the device page and virtio rings to user space for readonly access.
|
||
|
*/
|
||
|
static int vop_mmap(struct file *f, struct vm_area_struct *vma)
|
||
|
{
|
||
|
struct vop_vdev *vdev = f->private_data;
|
||
|
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
|
||
|
unsigned long pa, size = vma->vm_end - vma->vm_start, size_rem = size;
|
||
|
int i, err;
|
||
|
|
||
|
err = vop_vdev_inited(vdev);
|
||
|
if (err)
|
||
|
goto ret;
|
||
|
if (vma->vm_flags & VM_WRITE) {
|
||
|
err = -EACCES;
|
||
|
goto ret;
|
||
|
}
|
||
|
while (size_rem) {
|
||
|
i = vop_query_offset(vdev, offset, &size, &pa);
|
||
|
if (i < 0) {
|
||
|
err = -EINVAL;
|
||
|
goto ret;
|
||
|
}
|
||
|
err = remap_pfn_range(vma, vma->vm_start + offset,
|
||
|
pa >> PAGE_SHIFT, size,
|
||
|
vma->vm_page_prot);
|
||
|
if (err)
|
||
|
goto ret;
|
||
|
size_rem -= size;
|
||
|
offset += size;
|
||
|
}
|
||
|
ret:
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
static const struct file_operations vop_fops = {
|
||
|
.open = vop_open,
|
||
|
.release = vop_release,
|
||
|
.unlocked_ioctl = vop_ioctl,
|
||
|
.poll = vop_poll,
|
||
|
.mmap = vop_mmap,
|
||
|
.owner = THIS_MODULE,
|
||
|
};
|
||
|
|
||
|
int vop_host_init(struct vop_info *vi)
|
||
|
{
|
||
|
int rc;
|
||
|
struct miscdevice *mdev;
|
||
|
struct vop_device *vpdev = vi->vpdev;
|
||
|
|
||
|
INIT_LIST_HEAD(&vi->vdev_list);
|
||
|
vi->dma_ch = vpdev->dma_ch;
|
||
|
mdev = &vi->miscdev;
|
||
|
mdev->minor = MISC_DYNAMIC_MINOR;
|
||
|
snprintf(vi->name, sizeof(vi->name), "vop_virtio%d", vpdev->index);
|
||
|
mdev->name = vi->name;
|
||
|
mdev->fops = &vop_fops;
|
||
|
mdev->parent = &vpdev->dev;
|
||
|
|
||
|
rc = misc_register(mdev);
|
||
|
if (rc)
|
||
|
dev_err(&vpdev->dev, "%s failed rc %d\n", __func__, rc);
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
void vop_host_uninit(struct vop_info *vi)
|
||
|
{
|
||
|
struct list_head *pos, *tmp;
|
||
|
struct vop_vdev *vdev;
|
||
|
|
||
|
mutex_lock(&vi->vop_mutex);
|
||
|
vop_virtio_reset_devices(vi);
|
||
|
list_for_each_safe(pos, tmp, &vi->vdev_list) {
|
||
|
vdev = list_entry(pos, struct vop_vdev, list);
|
||
|
list_del(pos);
|
||
|
reinit_completion(&vdev->destroy);
|
||
|
mutex_unlock(&vi->vop_mutex);
|
||
|
mutex_lock(&vdev->vdev_mutex);
|
||
|
vop_virtio_del_device(vdev);
|
||
|
vdev->deleted = true;
|
||
|
mutex_unlock(&vdev->vdev_mutex);
|
||
|
complete(&vdev->destroy);
|
||
|
mutex_lock(&vi->vop_mutex);
|
||
|
}
|
||
|
mutex_unlock(&vi->vop_mutex);
|
||
|
misc_deregister(&vi->miscdev);
|
||
|
}
|