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Message-Id: <1364398203-11159-4-git-send-email-tomas.winkler@intel.com>
Date: Wed, 27 Mar 2013 17:29:55 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, linux-kernel@...r.kernel.org,
Samuel Ortiz <sameo@...ux.intel.com>,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 03/11 V5] mei: bus: Initial implementation for I/O routines
From: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/bus.c | 226 +++++++++++++++++++++++++++++++++++++++++++++
drivers/misc/mei/mei_dev.h | 30 ++++++
include/linux/mei_cl_bus.h | 11 +++
3 files changed, 267 insertions(+)
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index d16b3c3..16c7fff 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
+#include <linux/sched.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
@@ -25,6 +26,8 @@
#include <linux/mei_cl_bus.h>
#include "mei_dev.h"
+#include "hw-me.h"
+#include "client.h"
#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
#define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
@@ -81,6 +84,11 @@ static int mei_cl_device_remove(struct device *dev)
if (!device || !dev->driver)
return 0;
+ if (device->event_cb) {
+ device->event_cb = NULL;
+ cancel_work_sync(&device->event_work);
+ }
+
driver = to_mei_cl_driver(dev->driver);
if (!driver->remove) {
dev->driver = NULL;
@@ -196,3 +204,221 @@ void mei_cl_driver_unregister(struct mei_cl_driver *driver)
pr_debug("mei: driver [%s] unregistered\n", driver->driver.name);
}
EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
+
+int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
+{
+ struct mei_device *dev;
+ struct mei_msg_hdr mei_hdr;
+ struct mei_cl_cb *cb;
+ int me_cl_id, err;
+
+ if (WARN_ON(!cl || !cl->dev))
+ return -ENODEV;
+
+ if (cl->state != MEI_FILE_CONNECTED)
+ return -ENODEV;
+
+ cb = mei_io_cb_init(cl, NULL);
+ if (!cb)
+ return -ENOMEM;
+
+ err = mei_io_cb_alloc_req_buf(cb, length);
+ if (err < 0) {
+ mei_io_cb_free(cb);
+ return err;
+ }
+
+ memcpy(cb->request_buffer.data, buf, length);
+ cb->fop_type = MEI_FOP_WRITE;
+
+ dev = cl->dev;
+
+ mutex_lock(&dev->device_lock);
+
+ /* Check if we have an ME client device */
+ me_cl_id = mei_me_cl_by_id(dev, cl->me_client_id);
+ if (me_cl_id == dev->me_clients_num) {
+ err = -ENODEV;
+ goto out_err;
+ }
+
+ if (length > dev->me_clients[me_cl_id].props.max_msg_length) {
+ err = -EINVAL;
+ goto out_err;
+ }
+
+ err = mei_cl_flow_ctrl_creds(cl);
+ if (err < 0)
+ goto out_err;
+
+ /* Host buffer is not ready, we queue the request */
+ if (err == 0 || !dev->hbuf_is_ready) {
+ cb->buf_idx = 0;
+ mei_hdr.msg_complete = 0;
+ cl->writing_state = MEI_WRITING;
+ list_add_tail(&cb->list, &dev->write_list.list);
+
+ mutex_unlock(&dev->device_lock);
+
+ return length;
+ }
+
+ dev->hbuf_is_ready = false;
+
+ /* Check for a maximum length */
+ if (length > mei_hbuf_max_len(dev)) {
+ mei_hdr.length = mei_hbuf_max_len(dev);
+ mei_hdr.msg_complete = 0;
+ } else {
+ mei_hdr.length = length;
+ mei_hdr.msg_complete = 1;
+ }
+
+ mei_hdr.host_addr = cl->host_client_id;
+ mei_hdr.me_addr = cl->me_client_id;
+ mei_hdr.reserved = 0;
+
+ if (mei_write_message(dev, &mei_hdr, buf)) {
+ err = -EIO;
+ goto out_err;
+ }
+
+ cl->writing_state = MEI_WRITING;
+ cb->buf_idx = mei_hdr.length;
+
+ if (!mei_hdr.msg_complete) {
+ list_add_tail(&cb->list, &dev->write_list.list);
+ } else {
+ if (mei_cl_flow_ctrl_reduce(cl)) {
+ err = -EIO;
+ goto out_err;
+ }
+
+ list_add_tail(&cb->list, &dev->write_waiting_list.list);
+ }
+
+ mutex_unlock(&dev->device_lock);
+
+ return mei_hdr.length;
+
+out_err:
+ mutex_unlock(&dev->device_lock);
+ mei_io_cb_free(cb);
+
+ return err;
+}
+
+int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
+{
+ struct mei_device *dev;
+ struct mei_cl_cb *cb;
+ size_t r_length;
+ int err;
+
+ if (WARN_ON(!cl || !cl->dev))
+ return -ENODEV;
+
+ dev = cl->dev;
+
+ mutex_lock(&dev->device_lock);
+
+ if (!cl->read_cb) {
+ err = mei_cl_read_start(cl);
+ if (err < 0) {
+ mutex_unlock(&dev->device_lock);
+ return err;
+ }
+ }
+
+ if (cl->reading_state != MEI_READ_COMPLETE &&
+ !waitqueue_active(&cl->rx_wait)) {
+ mutex_unlock(&dev->device_lock);
+
+ if (wait_event_interruptible(cl->rx_wait,
+ (MEI_READ_COMPLETE == cl->reading_state))) {
+ if (signal_pending(current))
+ return -EINTR;
+ return -ERESTARTSYS;
+ }
+
+ mutex_lock(&dev->device_lock);
+ }
+
+ cb = cl->read_cb;
+
+ if (cl->reading_state != MEI_READ_COMPLETE) {
+ r_length = 0;
+ goto out;
+ }
+
+ r_length = min_t(size_t, length, cb->buf_idx);
+
+ memcpy(buf, cb->response_buffer.data, r_length);
+
+ mei_io_cb_free(cb);
+ cl->reading_state = MEI_IDLE;
+ cl->read_cb = NULL;
+
+out:
+ mutex_unlock(&dev->device_lock);
+
+ return r_length;
+}
+
+int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
+{
+ struct mei_cl *cl = NULL;
+
+ /* TODO: hook between mei_bus_client and mei_cl */
+
+ if (device->ops && device->ops->send)
+ return device->ops->send(device, buf, length);
+
+ return __mei_cl_send(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cl_send);
+
+int mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length)
+{
+ struct mei_cl *cl = NULL;
+
+ /* TODO: hook between mei_bus_client and mei_cl */
+
+ if (device->ops && device->ops->recv)
+ return device->ops->recv(device, buf, length);
+
+ return __mei_cl_recv(cl, buf, length);
+}
+EXPORT_SYMBOL_GPL(mei_cl_recv);
+
+static void mei_bus_event_work(struct work_struct *work)
+{
+ struct mei_cl_device *device;
+
+ device = container_of(work, struct mei_cl_device, event_work);
+
+ if (device->event_cb)
+ device->event_cb(device, device->events, device->event_context);
+
+ device->events = 0;
+
+ /* Prepare for the next read */
+ mei_cl_read_start(device->cl);
+}
+
+int mei_cl_register_event_cb(struct mei_cl_device *device,
+ mei_cl_event_cb_t event_cb, void *context)
+{
+ if (device->event_cb)
+ return -EALREADY;
+
+ device->events = 0;
+ device->event_cb = event_cb;
+ device->event_context = context;
+ INIT_WORK(&device->event_work, mei_bus_event_work);
+
+ mei_cl_read_start(device->cl);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mei_cl_register_event_cb);
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 7abb705d..cde5687 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -268,6 +268,25 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
uuid_le uuid, char *name);
void mei_cl_remove_device(struct mei_cl_device *device);
+int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
+int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
+
+/**
+ * struct mei_cl_transport_ops - MEI CL device transport ops
+ * This structure allows ME host clients to implement technology
+ * specific transport layers.
+ *
+ * @send: Tx hook for the device. This allows ME host clients to trap
+ * the device driver buffers before actually physically
+ * pushing it to the ME.
+ * @recv: Rx hook for the device. This allows ME host clients to trap the
+ * ME buffers before forwarding them to the device driver.
+ */
+struct mei_cl_transport_ops {
+ int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
+ int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
+};
+
/**
* struct mei_cl_device - MEI device handle
* An mei_cl_device pointer is returned from mei_add_device()
@@ -278,6 +297,10 @@ void mei_cl_remove_device(struct mei_cl_device *device);
* @dev: linux driver model device pointer
* @uuid: me client uuid
* @cl: mei client
+ * @ops: ME transport ops
+ * @event_cb: Drivers register this callback to get asynchronous ME
+ * events (e.g. Rx buffer pending) notifications.
+ * @events: Events bitmask sent to the driver.
* @priv_data: client private data
*/
struct mei_cl_device {
@@ -285,6 +308,13 @@ struct mei_cl_device {
struct mei_cl *cl;
+ const struct mei_cl_transport_ops *ops;
+
+ struct work_struct event_work;
+ mei_cl_event_cb_t event_cb;
+ void *event_context;
+ unsigned long events;
+
void *priv_data;
};
diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h
index ba2aa3b..d9958c3 100644
--- a/include/linux/mei_cl_bus.h
+++ b/include/linux/mei_cl_bus.h
@@ -24,4 +24,15 @@ int __mei_cl_driver_register(struct mei_cl_driver *driver,
void mei_cl_driver_unregister(struct mei_cl_driver *driver);
+int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length);
+int mei_cl_recv(struct mei_cl_device *device, u8 *buf, size_t length);
+
+typedef void (*mei_cl_event_cb_t)(struct mei_cl_device *device,
+ u32 events, void *context);
+int mei_cl_register_event_cb(struct mei_cl_device *device,
+ mei_cl_event_cb_t read_cb, void *context);
+
+#define MEI_CL_EVENT_RX 0
+#define MEI_CL_EVENT_TX 1
+
#endif /* _LINUX_MEI_CL_BUS_H */
--
1.7.11.7
--
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