diff options
Diffstat (limited to 'drivers/misc/mei/hw-virtio.c')
| -rw-r--r-- | drivers/misc/mei/hw-virtio.c | 874 |
1 files changed, 874 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-virtio.c b/drivers/misc/mei/hw-virtio.c new file mode 100644 index 000000000000..899dc1c5e7ca --- /dev/null +++ b/drivers/misc/mei/hw-virtio.c @@ -0,0 +1,874 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel Management Engine Interface (Intel MEI) Linux driver + * Copyright (c) 2018-2020, Intel Corporation. + */ +#include <linux/err.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/scatterlist.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/virtio.h> +#include <linux/virtio_config.h> +#include <linux/virtio_ids.h> +#include <linux/atomic.h> + +#include "mei_dev.h" +#include "hbm.h" +#include "client.h" + +#define MEI_VIRTIO_RPM_TIMEOUT 500 +/* ACRN virtio device types */ +#ifndef VIRTIO_ID_MEI +#define VIRTIO_ID_MEI 0xFFFE /* virtio mei */ +#endif + +/** + * struct mei_virtio_cfg - settings passed from the virtio backend + * @buf_depth: read buffer depth in slots (4bytes) + * @hw_ready: hw is ready for operation + * @host_reset: synchronize reset with virtio backend + * @reserved: reserved for alignment + * @fw_status: FW status + */ +struct mei_virtio_cfg { + u32 buf_depth; + u8 hw_ready; + u8 host_reset; + u8 reserved[2]; + u32 fw_status[MEI_FW_STATUS_MAX]; +} __packed; + +struct mei_virtio_hw { + struct mei_device mdev; + char name[32]; + + struct virtqueue *in; + struct virtqueue *out; + + bool host_ready; + struct work_struct intr_handler; + + u32 *recv_buf; + u8 recv_rdy; + size_t recv_sz; + u32 recv_idx; + u32 recv_len; + + /* send buffer */ + atomic_t hbuf_ready; + const void *send_hdr; + const void *send_buf; + + struct mei_virtio_cfg cfg; +}; + +#define to_virtio_hw(_dev) container_of(_dev, struct mei_virtio_hw, mdev) + +/** + * mei_virtio_fw_status() - read status register of mei + * @dev: mei device + * @fw_status: fw status register values + * + * Return: always 0 + */ +static int mei_virtio_fw_status(struct mei_device *dev, + struct mei_fw_status *fw_status) +{ + struct virtio_device *vdev = dev_to_virtio(dev->dev); + + fw_status->count = MEI_FW_STATUS_MAX; + virtio_cread_bytes(vdev, offsetof(struct mei_virtio_cfg, fw_status), + fw_status->status, sizeof(fw_status->status)); + return 0; +} + +/** + * mei_virtio_pg_state() - translate internal pg state + * to the mei power gating state + * There is no power management in ACRN mode always return OFF + * @dev: mei device + * + * Return: + * * MEI_PG_OFF - if aliveness is on (always) + * * MEI_PG_ON - (never) + */ +static inline enum mei_pg_state mei_virtio_pg_state(struct mei_device *dev) +{ + return MEI_PG_OFF; +} + +/** + * mei_virtio_hw_config() - configure hw dependent settings + * + * @dev: mei device + * + * Return: always 0 + */ +static int mei_virtio_hw_config(struct mei_device *dev) +{ + return 0; +} + +/** + * mei_virtio_hbuf_empty_slots() - counts write empty slots. + * @dev: the device structure + * + * Return: always return frontend buf size if buffer is ready, 0 otherwise + */ +static int mei_virtio_hbuf_empty_slots(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + return (atomic_read(&hw->hbuf_ready) == 1) ? hw->cfg.buf_depth : 0; +} + +/** + * mei_virtio_hbuf_is_ready() - checks if write buffer is ready + * @dev: the device structure + * + * Return: true if hbuf is ready + */ +static bool mei_virtio_hbuf_is_ready(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + return atomic_read(&hw->hbuf_ready) == 1; +} + +/** + * mei_virtio_hbuf_max_depth() - returns depth of FE write buffer. + * @dev: the device structure + * + * Return: size of frontend write buffer in bytes + */ +static u32 mei_virtio_hbuf_depth(const struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + return hw->cfg.buf_depth; +} + +/** + * mei_virtio_intr_clear() - clear and stop interrupts + * @dev: the device structure + */ +static void mei_virtio_intr_clear(struct mei_device *dev) +{ + /* + * In our virtio solution, there are two types of interrupts, + * vq interrupt and config change interrupt. + * 1) start/reset rely on virtio config changed interrupt; + * 2) send/recv rely on virtio virtqueue interrupts. + * They are all virtual interrupts. So, we don't have corresponding + * operation to do here. + */ +} + +/** + * mei_virtio_intr_enable() - enables mei BE virtqueues callbacks + * @dev: the device structure + */ +static void mei_virtio_intr_enable(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + struct virtio_device *vdev = dev_to_virtio(dev->dev); + + virtio_config_enable(vdev); + + virtqueue_enable_cb(hw->in); + virtqueue_enable_cb(hw->out); +} + +/** + * mei_virtio_intr_disable() - disables mei BE virtqueues callbacks + * + * @dev: the device structure + */ +static void mei_virtio_intr_disable(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + struct virtio_device *vdev = dev_to_virtio(dev->dev); + + virtio_config_disable(vdev); + + virtqueue_disable_cb(hw->in); + virtqueue_disable_cb(hw->out); +} + +/** + * mei_virtio_synchronize_irq() - wait for pending IRQ handlers for all + * virtqueue + * @dev: the device structure + */ +static void mei_virtio_synchronize_irq(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + /* + * Now, all IRQ handlers are converted to workqueue. + * Change synchronize irq to flush this work. + */ + flush_work(&hw->intr_handler); +} + +static void mei_virtio_free_outbufs(struct mei_virtio_hw *hw) +{ + kfree(hw->send_hdr); + kfree(hw->send_buf); + hw->send_hdr = NULL; + hw->send_buf = NULL; +} + +/** + * mei_virtio_write_message() - writes a message to mei virtio back-end service. + * @dev: the device structure + * @hdr: mei header of message + * @hdr_len: header length + * @data: message payload will be written + * @data_len: message payload length + * + * Return: + * * 0: on success + * * -EIO: if write has failed + * * -ENOMEM: on memory allocation failure + */ +static int mei_virtio_write_message(struct mei_device *dev, + const void *hdr, size_t hdr_len, + const void *data, size_t data_len) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + struct scatterlist sg[2]; + const void *hbuf, *dbuf; + int ret; + + if (WARN_ON(!atomic_add_unless(&hw->hbuf_ready, -1, 0))) + return -EIO; + + hbuf = kmemdup(hdr, hdr_len, GFP_KERNEL); + hw->send_hdr = hbuf; + + dbuf = kmemdup(data, data_len, GFP_KERNEL); + hw->send_buf = dbuf; + + if (!hbuf || !dbuf) { + ret = -ENOMEM; + goto fail; + } + + sg_init_table(sg, 2); + sg_set_buf(&sg[0], hbuf, hdr_len); + sg_set_buf(&sg[1], dbuf, data_len); + + ret = virtqueue_add_outbuf(hw->out, sg, 2, hw, GFP_KERNEL); + if (ret) { + dev_err(dev->dev, "failed to add outbuf\n"); + goto fail; + } + + virtqueue_kick(hw->out); + return 0; +fail: + + mei_virtio_free_outbufs(hw); + + return ret; +} + +/** + * mei_virtio_count_full_read_slots() - counts read full slots. + * @dev: the device structure + * + * Return: -EOVERFLOW if overflow, otherwise filled slots count + */ +static int mei_virtio_count_full_read_slots(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + if (hw->recv_idx > hw->recv_len) + return -EOVERFLOW; + + return hw->recv_len - hw->recv_idx; +} + +/** + * mei_virtio_read_hdr() - Reads 32bit dword from mei virtio receive buffer + * + * @dev: the device structure + * + * Return: 32bit dword of receive buffer (u32) + */ +static inline u32 mei_virtio_read_hdr(const struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + WARN_ON(hw->cfg.buf_depth < hw->recv_idx + 1); + + return hw->recv_buf[hw->recv_idx++]; +} + +static int mei_virtio_read(struct mei_device *dev, unsigned char *buffer, + unsigned long len) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + u32 slots = mei_data2slots(len); + + if (WARN_ON(hw->cfg.buf_depth < hw->recv_idx + slots)) + return -EOVERFLOW; + + /* + * Assumption: There is only one MEI message in recv_buf each time. + * Backend service need follow this rule too. + */ + memcpy(buffer, hw->recv_buf + hw->recv_idx, len); + hw->recv_idx += slots; + + return 0; +} + +static bool mei_virtio_pg_is_enabled(struct mei_device *dev) +{ + return false; +} + +static bool mei_virtio_pg_in_transition(struct mei_device *dev) +{ + return false; +} + +static void mei_virtio_add_recv_buf(struct mei_virtio_hw *hw) +{ + struct scatterlist sg; + + if (hw->recv_rdy) /* not needed */ + return; + + /* refill the recv_buf to IN virtqueue to get next message */ + sg_init_one(&sg, hw->recv_buf, mei_slots2data(hw->cfg.buf_depth)); + hw->recv_len = 0; + hw->recv_idx = 0; + hw->recv_rdy = 1; + virtqueue_add_inbuf(hw->in, &sg, 1, hw->recv_buf, GFP_KERNEL); + virtqueue_kick(hw->in); +} + +/** + * mei_virtio_hw_is_ready() - check whether the BE(hw) has turned ready + * @dev: mei device + * Return: bool + */ +static bool mei_virtio_hw_is_ready(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + struct virtio_device *vdev = dev_to_virtio(dev->dev); + + virtio_cread(vdev, struct mei_virtio_cfg, + hw_ready, &hw->cfg.hw_ready); + + dev_dbg(dev->dev, "hw ready %d\n", hw->cfg.hw_ready); + + return hw->cfg.hw_ready; +} + +/** + * mei_virtio_hw_reset - resets virtio hw. + * + * @dev: the device structure + * @intr_enable: virtio use data/config callbacks + * + * Return: 0 on success an error code otherwise + */ +static int mei_virtio_hw_reset(struct mei_device *dev, bool intr_enable) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + struct virtio_device *vdev = dev_to_virtio(dev->dev); + + dev_dbg(dev->dev, "hw reset\n"); + + dev->recvd_hw_ready = false; + hw->host_ready = false; + atomic_set(&hw->hbuf_ready, 0); + hw->recv_len = 0; + hw->recv_idx = 0; + + hw->cfg.host_reset = 1; + virtio_cwrite(vdev, struct mei_virtio_cfg, + host_reset, &hw->cfg.host_reset); + + mei_virtio_hw_is_ready(dev); + + if (intr_enable) + mei_virtio_intr_enable(dev); + + return 0; +} + +/** + * mei_virtio_hw_reset_release() - release device from the reset + * @dev: the device structure + */ +static void mei_virtio_hw_reset_release(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + struct virtio_device *vdev = dev_to_virtio(dev->dev); + + dev_dbg(dev->dev, "hw reset release\n"); + hw->cfg.host_reset = 0; + virtio_cwrite(vdev, struct mei_virtio_cfg, + host_reset, &hw->cfg.host_reset); +} + +/** + * mei_virtio_hw_ready_wait() - wait until the virtio(hw) has turned ready + * or timeout is reached + * @dev: mei device + * + * Return: 0 on success, error otherwise + */ +static int mei_virtio_hw_ready_wait(struct mei_device *dev) +{ + mutex_unlock(&dev->device_lock); + wait_event_timeout(dev->wait_hw_ready, + dev->recvd_hw_ready, + mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT)); + mutex_lock(&dev->device_lock); + if (!dev->recvd_hw_ready) { + dev_err(dev->dev, "wait hw ready failed\n"); + return -ETIMEDOUT; + } + + dev->recvd_hw_ready = false; + return 0; +} + +/** + * mei_virtio_hw_start() - hw start routine + * @dev: mei device + * + * Return: 0 on success, error otherwise + */ +static int mei_virtio_hw_start(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + int ret; + + dev_dbg(dev->dev, "hw start\n"); + mei_virtio_hw_reset_release(dev); + + ret = mei_virtio_hw_ready_wait(dev); + if (ret) + return ret; + + mei_virtio_add_recv_buf(hw); + atomic_set(&hw->hbuf_ready, 1); + dev_dbg(dev->dev, "hw is ready\n"); + hw->host_ready = true; + + return 0; +} + +/** + * mei_virtio_host_is_ready() - check whether the FE has turned ready + * @dev: mei device + * + * Return: bool + */ +static bool mei_virtio_host_is_ready(struct mei_device *dev) +{ + struct mei_virtio_hw *hw = to_virtio_hw(dev); + + dev_dbg(dev->dev, "host ready %d\n", hw->host_ready); + + return hw->host_ready; +} + +/** + * mei_virtio_data_in() - The callback of recv virtqueue of virtio mei + * @vq: receiving virtqueue + */ +static void mei_virtio_data_in(struct virtqueue *vq) +{ + struct mei_virtio_hw *hw = vq->vdev->priv; + + /* disable interrupts (enabled again from in the interrupt worker) */ + virtqueue_disable_cb(hw->in); + + schedule_work(&hw->intr_handler); +} + +/** + * mei_virtio_data_out() - The callback of send virtqueue of virtio mei + * @vq: transmitting virtqueue + */ +static void mei_virtio_data_out(struct virtqueue *vq) +{ + struct mei_virtio_hw *hw = vq->vdev->priv; + + schedule_work(&hw->intr_handler); +} + +static void mei_virtio_intr_handler(struct work_struct *work) +{ + struct mei_virtio_hw *hw = + container_of(work, struct mei_virtio_hw, intr_handler); + struct mei_device *dev = &hw->mdev; + LIST_HEAD(complete_list); + s32 slots; + int rets = 0; + void *data; + unsigned int len; + + mutex_lock(&dev->device_lock); + + if (dev->dev_state == MEI_DEV_DISABLED) { + dev_warn(dev->dev, "Interrupt in disabled state.\n"); + mei_virtio_intr_disable(dev); + goto end; + } + + /* check if ME wants a reset */ + if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) { + dev_warn(dev->dev, "BE service not ready: resetting.\n"); + schedule_work(&dev->reset_work); + goto end; + } + + /* check if we need to start the dev */ + if (!mei_host_is_ready(dev)) { + if (mei_hw_is_ready(dev)) { + dev_dbg(dev->dev, "we need to start the dev.\n"); + dev->recvd_hw_ready = true; + wake_up(&dev->wait_hw_ready); + } else { + dev_warn(dev->dev, "Spurious Interrupt\n"); + } + goto end; + } + + /* read */ + if (hw->recv_rdy) { + data = virtqueue_get_buf(hw->in, &len); + if (!data || !len) { + dev_dbg(dev->dev, "No data %d", len); + } else { + dev_dbg(dev->dev, "data_in %d\n", len); + WARN_ON(data != hw->recv_buf); + hw->recv_len = mei_data2slots(len); + hw->recv_rdy = 0; + } + } + + /* write */ + if (!atomic_read(&hw->hbuf_ready)) { + if (!virtqueue_get_buf(hw->out, &len)) { + dev_warn(dev->dev, "Failed to getbuf\n"); + } else { + mei_virtio_free_outbufs(hw); + atomic_inc(&hw->hbuf_ready); + } + } + + /* check slots available for reading */ + slots = mei_count_full_read_slots(dev); + while (slots > 0) { + dev_dbg(dev->dev, "slots to read = %08x\n", slots); + rets = mei_irq_read_handler(dev, &complete_list, &slots); + + if (rets && + (dev->dev_state != MEI_DEV_RESETTING && + dev->dev_state != MEI_DEV_POWER_DOWN)) { + dev_err(dev->dev, "mei_irq_read_handler ret = %d.\n", + rets); + schedule_work(&dev->reset_work); + goto end; + } + } + + dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + + mei_irq_write_handler(dev, &complete_list); + + dev->hbuf_is_ready = mei_hbuf_is_ready(dev); + + mei_irq_compl_handler(dev, &complete_list); + + mei_virtio_add_recv_buf(hw); + +end: + if (dev->dev_state != MEI_DEV_DISABLED) { + if (!virtqueue_enable_cb(hw->in)) + schedule_work(&hw->intr_handler); + } + + mutex_unlock(&dev->device_lock); +} + +static void mei_virtio_config_changed(struct virtio_device *vdev) +{ + struct mei_virtio_hw *hw = vdev->priv; + struct mei_device *dev = &hw->mdev; + + virtio_cread(vdev, struct mei_virtio_cfg, + hw_ready, &hw->cfg.hw_ready); + + if (dev->dev_state == MEI_DEV_DISABLED) { + dev_dbg(dev->dev, "disabled state don't start\n"); + return; + } + + /* Run intr handler once to handle reset notify */ + schedule_work(&hw->intr_handler); +} + +static void mei_virtio_remove_vqs(struct virtio_device *vdev) +{ + struct mei_virtio_hw *hw = vdev->priv; + + virtqueue_detach_unused_buf(hw->in); + hw->recv_len = 0; + hw->recv_idx = 0; + hw->recv_rdy = 0; + + virtqueue_detach_unused_buf(hw->out); + + mei_virtio_free_outbufs(hw); + + vdev->config->del_vqs(vdev); +} + +/* + * There are two virtqueues, one is for send and another is for recv. + */ +static int mei_virtio_init_vqs(struct mei_virtio_hw *hw, + struct virtio_device *vdev) +{ + struct virtqueue *vqs[2]; + + vq_callback_t *cbs[] = { + mei_virtio_data_in, + mei_virtio_data_out, + }; + static const char * const names[] = { + "in", + "out", + }; + int ret; + + ret = virtio_find_vqs(vdev, 2, vqs, cbs, names, NULL); + if (ret) + return ret; + + hw->in = vqs[0]; + hw->out = vqs[1]; + + return 0; +} + +static const struct mei_hw_ops mei_virtio_ops = { + .fw_status = mei_virtio_fw_status, + .pg_state = mei_virtio_pg_state, + + .host_is_ready = mei_virtio_host_is_ready, + + .hw_is_ready = mei_virtio_hw_is_ready, + .hw_reset = mei_virtio_hw_reset, + .hw_config = mei_virtio_hw_config, + .hw_start = mei_virtio_hw_start, + + .pg_in_transition = mei_virtio_pg_in_transition, + .pg_is_enabled = mei_virtio_pg_is_enabled, + + .intr_clear = mei_virtio_intr_clear, + .intr_enable = mei_virtio_intr_enable, + .intr_disable = mei_virtio_intr_disable, + .synchronize_irq = mei_virtio_synchronize_irq, + + .hbuf_free_slots = mei_virtio_hbuf_empty_slots, + .hbuf_is_ready = mei_virtio_hbuf_is_ready, + .hbuf_depth = mei_virtio_hbuf_depth, + + .write = mei_virtio_write_message, + + .rdbuf_full_slots = mei_virtio_count_full_read_slots, + .read_hdr = mei_virtio_read_hdr, + .read = mei_virtio_read, +}; + +static int mei_virtio_probe(struct virtio_device *vdev) +{ + struct mei_virtio_hw *hw; + int ret; + + hw = devm_kzalloc(&vdev->dev, sizeof(*hw), GFP_KERNEL); + if (!hw) + return -ENOMEM; + + vdev->priv = hw; + + INIT_WORK(&hw->intr_handler, mei_virtio_intr_handler); + + ret = mei_virtio_init_vqs(hw, vdev); + if (ret) + goto vqs_failed; + + virtio_cread(vdev, struct mei_virtio_cfg, + buf_depth, &hw->cfg.buf_depth); + + hw->recv_buf = kzalloc(mei_slots2data(hw->cfg.buf_depth), GFP_KERNEL); + if (!hw->recv_buf) { + ret = -ENOMEM; + goto hbuf_failed; + } + atomic_set(&hw->hbuf_ready, 0); + + virtio_device_ready(vdev); + + mei_device_init(&hw->mdev, &vdev->dev, &mei_virtio_ops); + + pm_runtime_get_noresume(&vdev->dev); + pm_runtime_set_active(&vdev->dev); + pm_runtime_enable(&vdev->dev); + + ret = mei_start(&hw->mdev); + if (ret) + goto mei_start_failed; + + pm_runtime_set_autosuspend_delay(&vdev->dev, MEI_VIRTIO_RPM_TIMEOUT); + pm_runtime_use_autosuspend(&vdev->dev); + + ret = mei_register(&hw->mdev, &vdev->dev); + if (ret) + goto mei_failed; + + pm_runtime_put(&vdev->dev); + + return 0; + +mei_failed: + mei_stop(&hw->mdev); +mei_start_failed: + mei_cancel_work(&hw->mdev); + mei_disable_interrupts(&hw->mdev); + kfree(hw->recv_buf); +hbuf_failed: + vdev->config->del_vqs(vdev); +vqs_failed: + return ret; +} + +static int __maybe_unused mei_virtio_pm_runtime_idle(struct device *device) +{ + struct virtio_device *vdev = dev_to_virtio(device); + struct mei_virtio_hw *hw = vdev->priv; + + dev_dbg(&vdev->dev, "rpm: mei_virtio : runtime_idle\n"); + + if (!hw) + return -ENODEV; + + if (mei_write_is_idle(&hw->mdev)) + pm_runtime_autosuspend(device); + + return -EBUSY; +} + +static int __maybe_unused mei_virtio_pm_runtime_suspend(struct device *device) +{ + return 0; +} + +static int __maybe_unused mei_virtio_pm_runtime_resume(struct device *device) +{ + return 0; +} + +static int __maybe_unused mei_virtio_freeze(struct virtio_device *vdev) +{ + struct mei_virtio_hw *hw = vdev->priv; + + dev_dbg(&vdev->dev, "freeze\n"); + + if (!hw) + return -ENODEV; + + mei_stop(&hw->mdev); + mei_disable_interrupts(&hw->mdev); + cancel_work_sync(&hw->intr_handler); + vdev->config->reset(vdev); + mei_virtio_remove_vqs(vdev); + + return 0; +} + +static int __maybe_unused mei_virtio_restore(struct virtio_device *vdev) +{ + struct mei_virtio_hw *hw = vdev->priv; + int ret; + + dev_dbg(&vdev->dev, "restore\n"); + + if (!hw) + return -ENODEV; + + ret = mei_virtio_init_vqs(hw, vdev); + if (ret) + return ret; + + virtio_device_ready(vdev); + + ret = mei_restart(&hw->mdev); + if (ret) + return ret; + + /* Start timer if stopped in suspend */ + schedule_delayed_work(&hw->mdev.timer_work, HZ); + + return 0; +} + +static const struct dev_pm_ops mei_virtio_pm_ops = { + SET_RUNTIME_PM_OPS(mei_virtio_pm_runtime_suspend, + mei_virtio_pm_runtime_resume, + mei_virtio_pm_runtime_idle) +}; + +static void mei_virtio_remove(struct virtio_device *vdev) +{ + struct mei_virtio_hw *hw = vdev->priv; + + mei_stop(&hw->mdev); + mei_disable_interrupts(&hw->mdev); + cancel_work_sync(&hw->intr_handler); + mei_deregister(&hw->mdev); + vdev->config->reset(vdev); + mei_virtio_remove_vqs(vdev); + kfree(hw->recv_buf); + pm_runtime_disable(&vdev->dev); +} + +static struct virtio_device_id id_table[] = { + { VIRTIO_ID_MEI, VIRTIO_DEV_ANY_ID }, + { } +}; + +static struct virtio_driver mei_virtio_driver = { + .id_table = id_table, + .probe = mei_virtio_probe, + .remove = mei_virtio_remove, + .config_changed = mei_virtio_config_changed, + .driver = { + .name = KBUILD_MODNAME, + .owner = THIS_MODULE, + .pm = &mei_virtio_pm_ops, + }, +#ifdef CONFIG_PM_SLEEP + .freeze = mei_virtio_freeze, + .restore = mei_virtio_restore, +#endif +}; + +module_virtio_driver(mei_virtio_driver); +MODULE_DEVICE_TABLE(virtio, id_table); +MODULE_DESCRIPTION("Virtio MEI frontend driver"); +MODULE_LICENSE("GPL v2"); |