/** * mei_poll - the poll function * * @file: pointer to file structure * @wait: pointer to poll_table structure * * Return: poll mask */ static __poll_t mei_poll(struct file *file, poll_table *wait) { __poll_t req_events = poll_requested_events(wait); struct mei_cl *cl = file->private_data; struct mei_device *dev; __poll_t mask = 0; bool notify_en; if (WARN_ON(!cl || !cl->dev)) return EPOLLERR; dev = cl->dev; mutex_lock(&dev->device_lock); notify_en = cl->notify_en && (req_events & EPOLLPRI); if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { mask = EPOLLERR; goto out; } if (notify_en) { poll_wait(file, &cl->ev_wait, wait); if (cl->notify_ev) mask |= EPOLLPRI; } if (req_events & (EPOLLIN | EPOLLRDNORM)) { poll_wait(file, &cl->rx_wait, wait); if (!list_empty(&cl->rd_completed)) mask |= EPOLLIN | EPOLLRDNORM; else mei_cl_read_start(cl, mei_cl_mtu(cl), file); } if (req_events & (POLLOUT | POLLWRNORM)) { poll_wait(file, &cl->tx_wait, wait); if (cl->tx_cb_queued < dev->tx_queue_limit) mask |= POLLOUT | POLLWRNORM; } out: mutex_unlock(&dev->device_lock); return mask; }
/** * mei_poll - the poll function * * @file: pointer to file structure * @wait: pointer to poll_table structure * * Return: poll mask */ static unsigned int mei_poll(struct file *file, poll_table *wait) { unsigned long req_events = poll_requested_events(wait); struct mei_cl *cl = file->private_data; struct mei_device *dev; unsigned int mask = 0; bool notify_en; if (WARN_ON(!cl || !cl->dev)) return POLLERR; dev = cl->dev; mutex_lock(&dev->device_lock); notify_en = cl->notify_en && (req_events & POLLPRI); if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { mask = POLLERR; goto out; } if (notify_en) { poll_wait(file, &cl->ev_wait, wait); if (cl->notify_ev) mask |= POLLPRI; } if (cl == &dev->iamthif_cl) { mask |= mei_amthif_poll(file, wait); goto out; } if (req_events & (POLLIN | POLLRDNORM)) { poll_wait(file, &cl->rx_wait, wait); if (!list_empty(&cl->rd_completed)) mask |= POLLIN | POLLRDNORM; else mei_cl_read_start(cl, mei_cl_mtu(cl), file); } out: mutex_unlock(&dev->device_lock); return mask; }
/** * mei_read - the read function. * * @file: pointer to file structure * @ubuf: pointer to user buffer * @length: buffer length * @offset: data offset in buffer * * returns >=0 data length on success , <0 on error */ static ssize_t mei_read(struct file *file, char __user *ubuf, size_t length, loff_t *offset) { struct mei_cl *cl = file->private_data; struct mei_cl_cb *cb_pos = NULL; struct mei_cl_cb *cb = NULL; struct mei_device *dev; int rets; int err; if (WARN_ON(!cl || !cl->dev)) return -ENODEV; dev = cl->dev; mutex_lock(&dev->device_lock); if (dev->dev_state != MEI_DEV_ENABLED) { rets = -ENODEV; goto out; } if (length == 0) { rets = 0; goto out; } if (cl == &dev->iamthif_cl) { rets = mei_amthif_read(dev, file, ubuf, length, offset); goto out; } if (cl->read_cb) { cb = cl->read_cb; /* read what left */ if (cb->buf_idx > *offset) goto copy_buffer; /* offset is beyond buf_idx we have no more data return 0 */ if (cb->buf_idx > 0 && cb->buf_idx <= *offset) { rets = 0; goto free; } /* Offset needs to be cleaned for contiguous reads*/ if (cb->buf_idx == 0 && *offset > 0) *offset = 0; } else if (*offset > 0) { *offset = 0; } err = mei_cl_read_start(cl, length); if (err && err != -EBUSY) { dev_dbg(&dev->pdev->dev, "mei start read failure with status = %d\n", err); rets = err; goto out; } if (MEI_READ_COMPLETE != cl->reading_state && !waitqueue_active(&cl->rx_wait)) { if (file->f_flags & O_NONBLOCK) { rets = -EAGAIN; goto out; } mutex_unlock(&dev->device_lock); if (wait_event_interruptible(cl->rx_wait, MEI_READ_COMPLETE == cl->reading_state || mei_cl_is_transitioning(cl))) { if (signal_pending(current)) return -EINTR; return -ERESTARTSYS; } mutex_lock(&dev->device_lock); if (mei_cl_is_transitioning(cl)) { rets = -EBUSY; goto out; } } cb = cl->read_cb; if (!cb) { rets = -ENODEV; goto out; } if (cl->reading_state != MEI_READ_COMPLETE) { rets = 0; goto out; } /* now copy the data to user space */ copy_buffer: dev_dbg(&dev->pdev->dev, "buf.size = %d buf.idx= %ld\n", cb->response_buffer.size, cb->buf_idx); if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) { rets = -EMSGSIZE; goto free; } /* length is being truncated to PAGE_SIZE, * however buf_idx may point beyond that */ length = min_t(size_t, length, cb->buf_idx - *offset); if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) { dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n"); rets = -EFAULT; goto free; } rets = length; *offset += length; if ((unsigned long)*offset < cb->buf_idx) goto out; free: cb_pos = mei_cl_find_read_cb(cl); /* Remove entry from read list */ if (cb_pos) list_del(&cb_pos->list); mei_io_cb_free(cb); cl->reading_state = MEI_IDLE; cl->read_cb = NULL; out: dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets); mutex_unlock(&dev->device_lock); return rets; }
/** * mei_read - the read function. * * @file: pointer to file structure * @ubuf: pointer to user buffer * @length: buffer length * @offset: data offset in buffer * * Return: >=0 data length on success , <0 on error */ static ssize_t mei_read(struct file *file, char __user *ubuf, size_t length, loff_t *offset) { struct mei_cl *cl = file->private_data; struct mei_device *dev; struct mei_cl_cb *cb = NULL; bool nonblock = !!(file->f_flags & O_NONBLOCK); int rets; if (WARN_ON(!cl || !cl->dev)) return -ENODEV; dev = cl->dev; mutex_lock(&dev->device_lock); if (dev->dev_state != MEI_DEV_ENABLED) { rets = -ENODEV; goto out; } if (length == 0) { rets = 0; goto out; } if (ubuf == NULL) { rets = -EMSGSIZE; goto out; } cb = mei_cl_read_cb(cl, file); if (cb) goto copy_buffer; if (*offset > 0) *offset = 0; rets = mei_cl_read_start(cl, length, file); if (rets && rets != -EBUSY) { cl_dbg(dev, cl, "mei start read failure status = %d\n", rets); goto out; } if (nonblock) { rets = -EAGAIN; goto out; } if (rets == -EBUSY && !mei_cl_enqueue_ctrl_wr_cb(cl, length, MEI_FOP_READ, file)) { rets = -ENOMEM; goto out; } do { mutex_unlock(&dev->device_lock); if (wait_event_interruptible(cl->rx_wait, (!list_empty(&cl->rd_completed)) || (!mei_cl_is_connected(cl)))) { if (signal_pending(current)) return -EINTR; return -ERESTARTSYS; } mutex_lock(&dev->device_lock); if (!mei_cl_is_connected(cl)) { rets = -ENODEV; goto out; } cb = mei_cl_read_cb(cl, file); } while (!cb); copy_buffer: /* now copy the data to user space */ if (cb->status) { rets = cb->status; cl_dbg(dev, cl, "read operation failed %d\n", rets); goto free; } cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", cb->buf.size, cb->buf_idx, *offset); if (*offset >= cb->buf_idx) { rets = 0; goto free; } /* length is being truncated to PAGE_SIZE, * however buf_idx may point beyond that */ length = min_t(size_t, length, cb->buf_idx - *offset); if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { dev_dbg(dev->dev, "failed to copy data to userland\n"); rets = -EFAULT; goto free; } rets = length; *offset += length; /* not all data was read, keep the cb */ if (*offset < cb->buf_idx) goto out; free: mei_io_cb_free(cb); *offset = 0; out: cl_dbg(dev, cl, "end mei read rets = %d\n", rets); mutex_unlock(&dev->device_lock); return rets; }
/** * mei_read - the read function. * * @file: pointer to file structure * @ubuf: pointer to user buffer * @length: buffer length * @offset: data offset in buffer * * returns >=0 data length on success , <0 on error */ static ssize_t mei_read(struct file *file, char __user *ubuf, size_t length, loff_t *offset) { struct mei_cl *cl = file->private_data; struct mei_cl_cb *cb_pos = NULL; struct mei_cl_cb *cb = NULL; struct mei_device *dev; int i; int rets; int err; if (WARN_ON(!cl || !cl->dev)) return -ENODEV; dev = cl->dev; mutex_lock(&dev->device_lock); if (dev->dev_state != MEI_DEV_ENABLED) { rets = -ENODEV; goto out; } if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) { /* Do not allow to read watchdog client */ i = mei_me_cl_by_uuid(dev, &mei_wd_guid); if (i >= 0) { struct mei_me_client *me_client = &dev->me_clients[i]; if (cl->me_client_id == me_client->client_id) { rets = -EBADF; goto out; } } } else { cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT; } if (cl == &dev->iamthif_cl) { rets = mei_amthif_read(dev, file, ubuf, length, offset); goto out; } if (cl->read_cb && cl->read_cb->buf_idx > *offset) { cb = cl->read_cb; goto copy_buffer; } else if (cl->read_cb && cl->read_cb->buf_idx > 0 && cl->read_cb->buf_idx <= *offset) { cb = cl->read_cb; rets = 0; goto free; } else if ((!cl->read_cb || !cl->read_cb->buf_idx) && *offset > 0) { /*Offset needs to be cleaned for contiguous reads*/ *offset = 0; rets = 0; goto out; } err = mei_cl_read_start(cl, length); if (err && err != -EBUSY) { dev_dbg(&dev->pdev->dev, "mei start read failure with status = %d\n", err); rets = err; goto out; } if (MEI_READ_COMPLETE != cl->reading_state && !waitqueue_active(&cl->rx_wait)) { if (file->f_flags & O_NONBLOCK) { rets = -EAGAIN; goto out; } mutex_unlock(&dev->device_lock); if (wait_event_interruptible(cl->rx_wait, (MEI_READ_COMPLETE == cl->reading_state || MEI_FILE_INITIALIZING == cl->state || MEI_FILE_DISCONNECTED == cl->state || MEI_FILE_DISCONNECTING == cl->state))) { if (signal_pending(current)) return -EINTR; return -ERESTARTSYS; } mutex_lock(&dev->device_lock); if (MEI_FILE_INITIALIZING == cl->state || MEI_FILE_DISCONNECTED == cl->state || MEI_FILE_DISCONNECTING == cl->state) { rets = -EBUSY; goto out; } } cb = cl->read_cb; if (!cb) { rets = -ENODEV; goto out; } if (cl->reading_state != MEI_READ_COMPLETE) { rets = 0; goto out; } /* now copy the data to user space */ copy_buffer: dev_dbg(&dev->pdev->dev, "buf.size = %d buf.idx= %ld\n", cb->response_buffer.size, cb->buf_idx); if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) { rets = -EMSGSIZE; goto free; } /* length is being truncated to PAGE_SIZE, * however buf_idx may point beyond that */ length = min_t(size_t, length, cb->buf_idx - *offset); if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) { rets = -EFAULT; goto free; } rets = length; *offset += length; if ((unsigned long)*offset < cb->buf_idx) goto out; free: cb_pos = mei_cl_find_read_cb(cl); /* Remove entry from read list */ if (cb_pos) list_del(&cb_pos->list); mei_io_cb_free(cb); cl->reading_state = MEI_IDLE; cl->read_cb = NULL; out: dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets); mutex_unlock(&dev->device_lock); return rets; }
/** * mei_read - the read function. * * @file: pointer to file structure * @ubuf: pointer to user buffer * @length: buffer length * @offset: data offset in buffer * * Return: >=0 data length on success , <0 on error */ static ssize_t mei_read(struct file *file, char __user *ubuf, size_t length, loff_t *offset) { struct mei_cl *cl = file->private_data; struct mei_device *dev; struct mei_cl_cb *cb = NULL; int rets; int err; if (WARN_ON(!cl || !cl->dev)) return -ENODEV; dev = cl->dev; mutex_lock(&dev->device_lock); if (dev->dev_state != MEI_DEV_ENABLED) { rets = -ENODEV; goto out; } if (length == 0) { rets = 0; goto out; } if (cl == &dev->iamthif_cl) { rets = mei_amthif_read(dev, file, ubuf, length, offset); goto out; } cb = mei_cl_read_cb(cl, file); if (cb) { /* read what left */ if (cb->buf_idx > *offset) goto copy_buffer; /* offset is beyond buf_idx we have no more data return 0 */ if (cb->buf_idx > 0 && cb->buf_idx <= *offset) { rets = 0; goto free; } /* Offset needs to be cleaned for contiguous reads*/ if (cb->buf_idx == 0 && *offset > 0) *offset = 0; } else if (*offset > 0) { *offset = 0; } err = mei_cl_read_start(cl, length, file); if (err && err != -EBUSY) { cl_dbg(dev, cl, "mei start read failure status = %d\n", err); rets = err; goto out; } if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { if (file->f_flags & O_NONBLOCK) { rets = -EAGAIN; goto out; } mutex_unlock(&dev->device_lock); if (wait_event_interruptible(cl->rx_wait, (!list_empty(&cl->rd_completed)) || (!mei_cl_is_connected(cl)))) { if (signal_pending(current)) return -EINTR; return -ERESTARTSYS; } mutex_lock(&dev->device_lock); if (!mei_cl_is_connected(cl)) { rets = -EBUSY; goto out; } } cb = mei_cl_read_cb(cl, file); if (!cb) { if (mei_cl_is_fixed_address(cl) && dev->allow_fixed_address) { cb = mei_cl_read_cb(cl, NULL); if (cb) goto copy_buffer; } rets = 0; goto out; } copy_buffer: /* now copy the data to user space */ if (cb->status) { rets = cb->status; cl_dbg(dev, cl, "read operation failed %d\n", rets); goto free; } cl_dbg(dev, cl, "buf.size = %d buf.idx = %ld\n", cb->buf.size, cb->buf_idx); if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) { rets = -EMSGSIZE; goto free; } /* length is being truncated to PAGE_SIZE, * however buf_idx may point beyond that */ length = min_t(size_t, length, cb->buf_idx - *offset); if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { dev_dbg(dev->dev, "failed to copy data to userland\n"); rets = -EFAULT; goto free; } rets = length; *offset += length; if ((unsigned long)*offset < cb->buf_idx) goto out; free: mei_io_cb_free(cb); out: cl_dbg(dev, cl, "end mei read rets = %d\n", rets); mutex_unlock(&dev->device_lock); return rets; }