mei: bus: Initial implementation for I/O routines
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Ortiz
Greg Kroah-Hartman
parent
333e4ee078
commit
3e8332952d
@ -16,6 +16,7 @@
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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@ -25,6 +26,8 @@
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#include <linux/mei_cl_bus.h>
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#include "mei_dev.h"
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#include "hw-me.h"
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#include "client.h"
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#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
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#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
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@ -81,6 +84,11 @@ static int mei_cl_device_remove(struct device *dev)
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if (!device || !dev->driver)
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return 0;
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if (device->event_cb) {
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device->event_cb = NULL;
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cancel_work_sync(&device->event_work);
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}
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driver = to_mei_cl_driver(dev->driver);
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if (!driver->remove) {
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dev->driver = NULL;
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@ -196,3 +204,221 @@ void mei_cl_driver_unregister(struct mei_cl_driver *driver)
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pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
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}
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EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
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int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
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{
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struct mei_device *dev;
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struct mei_msg_hdr mei_hdr;
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struct mei_cl_cb *cb;
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int me_cl_id, err;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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if (cl->state != MEI_FILE_CONNECTED)
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return -ENODEV;
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cb = mei_io_cb_init(cl, NULL);
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if (!cb)
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return -ENOMEM;
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err = mei_io_cb_alloc_req_buf(cb, length);
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if (err < 0) {
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mei_io_cb_free(cb);
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return err;
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}
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memcpy(cb->request_buffer.data, buf, length);
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cb->fop_type = MEI_FOP_WRITE;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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/* Check if we have an ME client device */
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me_cl_id = mei_me_cl_by_id(dev, cl->me_client_id);
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if (me_cl_id == dev->me_clients_num) {
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err = -ENODEV;
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goto out_err;
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}
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if (length > dev->me_clients[me_cl_id].props.max_msg_length) {
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err = -EINVAL;
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goto out_err;
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}
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err = mei_cl_flow_ctrl_creds(cl);
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if (err < 0)
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goto out_err;
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/* Host buffer is not ready, we queue the request */
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if (err == 0 || !dev->hbuf_is_ready) {
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cb->buf_idx = 0;
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mei_hdr.msg_complete = 0;
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cl->writing_state = MEI_WRITING;
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list_add_tail(&cb->list, &dev->write_list.list);
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mutex_unlock(&dev->device_lock);
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return length;
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}
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dev->hbuf_is_ready = false;
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/* Check for a maximum length */
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if (length > mei_hbuf_max_len(dev)) {
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mei_hdr.length = mei_hbuf_max_len(dev);
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mei_hdr.msg_complete = 0;
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} else {
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mei_hdr.length = length;
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mei_hdr.msg_complete = 1;
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}
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mei_hdr.host_addr = cl->host_client_id;
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mei_hdr.me_addr = cl->me_client_id;
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mei_hdr.reserved = 0;
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if (mei_write_message(dev, &mei_hdr, buf)) {
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err = -EIO;
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goto out_err;
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}
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cl->writing_state = MEI_WRITING;
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cb->buf_idx = mei_hdr.length;
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if (!mei_hdr.msg_complete) {
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list_add_tail(&cb->list, &dev->write_list.list);
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} else {
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if (mei_cl_flow_ctrl_reduce(cl)) {
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err = -EIO;
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goto out_err;
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}
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list_add_tail(&cb->list, &dev->write_waiting_list.list);
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}
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mutex_unlock(&dev->device_lock);
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return mei_hdr.length;
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out_err:
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mutex_unlock(&dev->device_lock);
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mei_io_cb_free(cb);
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return err;
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}
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int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
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{
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struct mei_device *dev;
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struct mei_cl_cb *cb;
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size_t r_length;
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int err;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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if (!cl->read_cb) {
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err = mei_cl_read_start(cl);
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if (err < 0) {
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mutex_unlock(&dev->device_lock);
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return err;
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}
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}
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if (cl->reading_state != MEI_READ_COMPLETE &&
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!waitqueue_active(&cl->rx_wait)) {
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mutex_unlock(&dev->device_lock);
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if (wait_event_interruptible(cl->rx_wait,
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(MEI_READ_COMPLETE == cl->reading_state))) {
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if (signal_pending(current))
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return -EINTR;
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return -ERESTARTSYS;
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}
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mutex_lock(&dev->device_lock);
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}
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cb = cl->read_cb;
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if (cl->reading_state != MEI_READ_COMPLETE) {
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r_length = 0;
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goto out;
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}
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r_length = min_t(size_t, length, cb->buf_idx);
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memcpy(buf, cb->response_buffer.data, r_length);
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mei_io_cb_free(cb);
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cl->reading_state = MEI_IDLE;
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cl->read_cb = NULL;
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out:
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mutex_unlock(&dev->device_lock);
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return r_length;
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}
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int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
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{
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struct mei_cl *cl = NULL;
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/* TODO: hook between mei_bus_client and mei_cl */
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if (device->ops && device->ops->send)
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return device->ops->send(device, buf, length);
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return __mei_cl_send(cl, buf, length);
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}
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EXPORT_SYMBOL_GPL(mei_cl_send);
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int mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
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{
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struct mei_cl *cl = NULL;
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/* TODO: hook between mei_bus_client and mei_cl */
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if (device->ops && device->ops->recv)
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return device->ops->recv(device, buf, length);
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return __mei_cl_recv(cl, buf, length);
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}
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EXPORT_SYMBOL_GPL(mei_cl_recv);
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static void mei_bus_event_work(struct work_struct *work)
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{
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struct mei_cl_device *device;
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device = container_of(work, struct mei_cl_device, event_work);
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if (device->event_cb)
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device->event_cb(device, device->events, device->event_context);
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device->events = 0;
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/* Prepare for the next read */
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mei_cl_read_start(device->cl);
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}
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int mei_cl_register_event_cb(struct mei_cl_device *device,
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mei_cl_event_cb_t event_cb, void *context)
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{
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if (device->event_cb)
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return -EALREADY;
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device->events = 0;
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device->event_cb = event_cb;
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device->event_context = context;
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INIT_WORK(&device->event_work, mei_bus_event_work);
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mei_cl_read_start(device->cl);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
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@ -268,6 +268,25 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
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uuid_le uuid, char *name);
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void mei_cl_remove_device(struct mei_cl_device *device);
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int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
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int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
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/**
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* struct mei_cl_transport_ops - MEI CL device transport ops
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* This structure allows ME host clients to implement technology
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* specific transport layers.
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*
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* @send: Tx hook for the device. This allows ME host clients to trap
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* the device driver buffers before actually physically
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* pushing it to the ME.
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* @recv: Rx hook for the device. This allows ME host clients to trap the
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* ME buffers before forwarding them to the device driver.
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*/
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struct mei_cl_transport_ops {
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int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
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int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
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};
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/**
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* struct mei_cl_device - MEI device handle
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* An mei_cl_device pointer is returned from mei_add_device()
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@ -278,6 +297,10 @@ void mei_cl_remove_device(struct mei_cl_device *device);
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* @dev: linux driver model device pointer
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* @uuid: me client uuid
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* @cl: mei client
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* @ops: ME transport ops
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* @event_cb: Drivers register this callback to get asynchronous ME
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* events (e.g. Rx buffer pending) notifications.
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* @events: Events bitmask sent to the driver.
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* @priv_data: client private data
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*/
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struct mei_cl_device {
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@ -285,6 +308,13 @@ struct mei_cl_device {
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struct mei_cl *cl;
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const struct mei_cl_transport_ops *ops;
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struct work_struct event_work;
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mei_cl_event_cb_t event_cb;
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void *event_context;
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unsigned long events;
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void *priv_data;
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};
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@ -24,4 +24,15 @@ int __mei_cl_driver_register(struct mei_cl_driver *driver,
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void mei_cl_driver_unregister(struct mei_cl_driver *driver);
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int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length);
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int mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length);
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typedef void (*mei_cl_event_cb_t)(struct mei_cl_device *device,
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u32 events, void *context);
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int mei_cl_register_event_cb(struct mei_cl_device *device,
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mei_cl_event_cb_t read_cb, void *context);
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#define MEI_CL_EVENT_RX 0
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#define MEI_CL_EVENT_TX 1
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#endif /* _LINUX_MEI_CL_BUS_H */
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