summaryrefslogtreecommitdiff
path: root/drivers/misc/mei/amthif.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/misc/mei/amthif.c')
-rw-r--r--drivers/misc/mei/amthif.c345
1 files changed, 77 insertions, 268 deletions
diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index a039a5df6f21..7ae89b4a21d5 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -47,7 +47,6 @@ const uuid_le mei_amthif_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,
void mei_amthif_reset_params(struct mei_device *dev)
{
/* reset iamthif parameters. */
- dev->iamthif_current_cb = NULL;
dev->iamthif_canceled = false;
dev->iamthif_state = MEI_IAMTHIF_IDLE;
dev->iamthif_stall_timer = 0;
@@ -67,8 +66,12 @@ int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
struct mei_cl *cl = &dev->iamthif_cl;
int ret;
- if (mei_cl_is_connected(cl))
- return 0;
+ mutex_lock(&dev->device_lock);
+
+ if (mei_cl_is_connected(cl)) {
+ ret = 0;
+ goto out;
+ }
dev->iamthif_state = MEI_IAMTHIF_IDLE;
@@ -77,179 +80,37 @@ int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
ret = mei_cl_link(cl);
if (ret < 0) {
dev_err(dev->dev, "amthif: failed cl_link %d\n", ret);
- return ret;
+ goto out;
}
ret = mei_cl_connect(cl, me_cl, NULL);
- return ret;
-}
-
-/**
- * mei_amthif_read - read data from AMTHIF client
- *
- * @dev: the device structure
- * @file: pointer to file object
- * @ubuf: pointer to user data in user space
- * @length: data length to read
- * @offset: data read offset
- *
- * Locking: called under "dev->device_lock" lock
- *
- * Return:
- * returned data length on success,
- * zero if no data to read,
- * negative on failure.
- */
-int mei_amthif_read(struct mei_device *dev, struct file *file,
- char __user *ubuf, size_t length, loff_t *offset)
-{
- struct mei_cl *cl = file->private_data;
- struct mei_cl_cb *cb;
- int rets;
- int wait_ret;
-
- dev_dbg(dev->dev, "checking amthif data\n");
- cb = mei_cl_read_cb(cl, file);
-
- /* Check for if we can block or not*/
- if (cb == NULL && file->f_flags & O_NONBLOCK)
- return -EAGAIN;
-
-
- dev_dbg(dev->dev, "waiting for amthif data\n");
- while (cb == NULL) {
- /* unlock the Mutex */
- mutex_unlock(&dev->device_lock);
-
- wait_ret = wait_event_interruptible(cl->rx_wait,
- !list_empty(&cl->rd_completed) ||
- !mei_cl_is_connected(cl));
-
- /* Locking again the Mutex */
- mutex_lock(&dev->device_lock);
-
- if (wait_ret)
- return -ERESTARTSYS;
-
- if (!mei_cl_is_connected(cl)) {
- rets = -EBUSY;
- goto out;
- }
-
- cb = mei_cl_read_cb(cl, file);
- }
-
- if (cb->status) {
- rets = cb->status;
- dev_dbg(dev->dev, "read operation failed %d\n", rets);
- goto free;
- }
-
- dev_dbg(dev->dev, "Got amthif data\n");
- /* if the whole message will fit remove it from the list */
- if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
- list_del_init(&cb->list);
- else if (cb->buf_idx <= *offset) {
- /* end of the message has been reached */
- list_del_init(&cb->list);
- rets = 0;
- goto free;
- }
- /* else means that not full buffer will be read and do not
- * remove message from deletion list
- */
-
- dev_dbg(dev->dev, "amthif cb->buf.size - %zu cb->buf_idx - %zu\n",
- cb->buf.size, cb->buf_idx);
-
- /* length is being truncated to PAGE_SIZE, however,
- * the buf_idx may point beyond */
- 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;
- } else {
- rets = length;
- if ((*offset + length) < cb->buf_idx) {
- *offset += length;
- goto out;
- }
- }
-free:
- dev_dbg(dev->dev, "free amthif cb memory.\n");
- *offset = 0;
- mei_io_cb_free(cb);
out:
- return rets;
+ mutex_unlock(&dev->device_lock);
+ return ret;
}
/**
* mei_amthif_read_start - queue message for sending read credential
*
* @cl: host client
- * @file: file pointer of message recipient
+ * @fp: file pointer of message recipient
*
* Return: 0 on success, <0 on failure.
*/
-static int mei_amthif_read_start(struct mei_cl *cl, const struct file *file)
+static int mei_amthif_read_start(struct mei_cl *cl, const struct file *fp)
{
struct mei_device *dev = cl->dev;
struct mei_cl_cb *cb;
- int rets;
-
- cb = mei_io_cb_init(cl, MEI_FOP_READ, file);
- if (!cb) {
- rets = -ENOMEM;
- goto err;
- }
- rets = mei_io_cb_alloc_buf(cb, mei_cl_mtu(cl));
- if (rets)
- goto err;
+ cb = mei_cl_enqueue_ctrl_wr_cb(cl, mei_cl_mtu(cl), MEI_FOP_READ, fp);
+ if (!cb)
+ return -ENOMEM;
- list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
+ cl->rx_flow_ctrl_creds++;
dev->iamthif_state = MEI_IAMTHIF_READING;
- dev->iamthif_fp = cb->fp;
- dev->iamthif_current_cb = cb;
-
- return 0;
-err:
- mei_io_cb_free(cb);
- return rets;
-}
-
-/**
- * mei_amthif_send_cmd - send amthif command to the ME
- *
- * @cl: the host client
- * @cb: mei call back struct
- *
- * Return: 0 on success, <0 on failure.
- */
-static int mei_amthif_send_cmd(struct mei_cl *cl, struct mei_cl_cb *cb)
-{
- struct mei_device *dev;
- int ret;
-
- if (!cl->dev || !cb)
- return -ENODEV;
-
- dev = cl->dev;
-
- dev->iamthif_state = MEI_IAMTHIF_WRITING;
- dev->iamthif_current_cb = cb;
- dev->iamthif_fp = cb->fp;
- dev->iamthif_canceled = false;
-
- ret = mei_cl_write(cl, cb, false);
- if (ret < 0)
- return ret;
-
- if (cb->completed)
- cb->status = mei_amthif_read_start(cl, cb->fp);
+ cl->fp = cb->fp;
return 0;
}
@@ -265,20 +126,32 @@ int mei_amthif_run_next_cmd(struct mei_device *dev)
{
struct mei_cl *cl = &dev->iamthif_cl;
struct mei_cl_cb *cb;
+ int ret;
dev->iamthif_canceled = false;
- dev->iamthif_state = MEI_IAMTHIF_IDLE;
- dev->iamthif_fp = NULL;
dev_dbg(dev->dev, "complete amthif cmd_list cb.\n");
cb = list_first_entry_or_null(&dev->amthif_cmd_list.list,
typeof(*cb), list);
- if (!cb)
+ if (!cb) {
+ dev->iamthif_state = MEI_IAMTHIF_IDLE;
+ cl->fp = NULL;
return 0;
+ }
list_del_init(&cb->list);
- return mei_amthif_send_cmd(cl, cb);
+ dev->iamthif_state = MEI_IAMTHIF_WRITING;
+ cl->fp = cb->fp;
+
+ ret = mei_cl_write(cl, cb, false);
+ if (ret < 0)
+ return ret;
+
+ if (cb->completed)
+ cb->status = mei_amthif_read_start(cl, cb->fp);
+
+ return 0;
}
/**
@@ -299,8 +172,7 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
/*
* The previous request is still in processing, queue this one.
*/
- if (dev->iamthif_state > MEI_IAMTHIF_IDLE &&
- dev->iamthif_state < MEI_IAMTHIF_READ_COMPLETE)
+ if (dev->iamthif_state != MEI_IAMTHIF_IDLE)
return 0;
return mei_amthif_run_next_cmd(dev);
@@ -309,7 +181,6 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
/**
* mei_amthif_poll - the amthif poll function
*
- * @dev: the device structure
* @file: pointer to file structure
* @wait: pointer to poll_table structure
*
@@ -317,26 +188,19 @@ int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
*
* Locking: called under "dev->device_lock" lock
*/
-
-unsigned int mei_amthif_poll(struct mei_device *dev,
- struct file *file, poll_table *wait)
+unsigned int mei_amthif_poll(struct file *file, poll_table *wait)
{
+ struct mei_cl *cl = file->private_data;
+ struct mei_cl_cb *cb = mei_cl_read_cb(cl, file);
unsigned int mask = 0;
- poll_wait(file, &dev->iamthif_cl.rx_wait, wait);
-
- if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
- dev->iamthif_fp == file) {
-
+ poll_wait(file, &cl->rx_wait, wait);
+ if (cb)
mask |= POLLIN | POLLRDNORM;
- mei_amthif_run_next_cmd(dev);
- }
return mask;
}
-
-
/**
* mei_amthif_irq_write - write iamthif command in irq thread context.
*
@@ -393,7 +257,6 @@ int mei_amthif_irq_read_msg(struct mei_cl *cl,
return 0;
dev_dbg(dev->dev, "completed amthif read.\n ");
- dev->iamthif_current_cb = NULL;
dev->iamthif_stall_timer = 0;
return 0;
@@ -409,115 +272,63 @@ void mei_amthif_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
{
struct mei_device *dev = cl->dev;
- if (cb->fop_type == MEI_FOP_WRITE) {
+ dev_dbg(dev->dev, "completing amthif call back.\n");
+ switch (cb->fop_type) {
+ case MEI_FOP_WRITE:
if (!cb->status) {
dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
+ mei_schedule_stall_timer(dev);
mei_io_cb_free(cb);
return;
}
- /*
- * in case of error enqueue the write cb to complete read list
- * so it can be propagated to the reader
- */
- list_add_tail(&cb->list, &cl->rd_completed);
- wake_up_interruptible(&cl->rx_wait);
- return;
- }
+ dev->iamthif_state = MEI_IAMTHIF_IDLE;
+ cl->fp = NULL;
+ if (!dev->iamthif_canceled) {
+ /*
+ * in case of error enqueue the write cb to complete
+ * read list so it can be propagated to the reader
+ */
+ list_add_tail(&cb->list, &cl->rd_completed);
+ wake_up_interruptible(&cl->rx_wait);
+ } else {
+ mei_io_cb_free(cb);
+ }
+ break;
+ case MEI_FOP_READ:
+ if (!dev->iamthif_canceled) {
+ list_add_tail(&cb->list, &cl->rd_completed);
+ dev_dbg(dev->dev, "amthif read completed\n");
+ wake_up_interruptible(&cl->rx_wait);
+ } else {
+ mei_io_cb_free(cb);
+ }
- if (!dev->iamthif_canceled) {
- dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
dev->iamthif_stall_timer = 0;
- list_add_tail(&cb->list, &cl->rd_completed);
- dev_dbg(dev->dev, "amthif read completed\n");
- } else {
mei_amthif_run_next_cmd(dev);
+ break;
+ default:
+ WARN_ON(1);
}
-
- dev_dbg(dev->dev, "completing amthif call back.\n");
- wake_up_interruptible(&cl->rx_wait);
}
/**
* mei_clear_list - removes all callbacks associated with file
* from mei_cb_list
*
- * @dev: device structure.
* @file: file structure
* @mei_cb_list: callbacks list
*
* mei_clear_list is called to clear resources associated with file
* when application calls close function or Ctrl-C was pressed
- *
- * Return: true if callback removed from the list, false otherwise
*/
-static bool mei_clear_list(struct mei_device *dev,
- const struct file *file, struct list_head *mei_cb_list)
+static void mei_clear_list(const struct file *file,
+ struct list_head *mei_cb_list)
{
- struct mei_cl *cl = &dev->iamthif_cl;
struct mei_cl_cb *cb, *next;
- bool removed = false;
-
- /* list all list member */
- list_for_each_entry_safe(cb, next, mei_cb_list, list) {
- /* check if list member associated with a file */
- if (file == cb->fp) {
- /* check if cb equal to current iamthif cb */
- if (dev->iamthif_current_cb == cb) {
- dev->iamthif_current_cb = NULL;
- /* send flow control to iamthif client */
- mei_hbm_cl_flow_control_req(dev, cl);
- }
- /* free all allocated buffers */
- mei_io_cb_free(cb);
- removed = true;
- }
- }
- return removed;
-}
-/**
- * mei_clear_lists - removes all callbacks associated with file
- *
- * @dev: device structure
- * @file: file structure
- *
- * mei_clear_lists is called to clear resources associated with file
- * when application calls close function or Ctrl-C was pressed
- *
- * Return: true if callback removed from the list, false otherwise
- */
-static bool mei_clear_lists(struct mei_device *dev, const struct file *file)
-{
- bool removed = false;
- struct mei_cl *cl = &dev->iamthif_cl;
-
- /* remove callbacks associated with a file */
- mei_clear_list(dev, file, &dev->amthif_cmd_list.list);
- if (mei_clear_list(dev, file, &cl->rd_completed))
- removed = true;
-
- mei_clear_list(dev, file, &dev->ctrl_rd_list.list);
-
- if (mei_clear_list(dev, file, &dev->ctrl_wr_list.list))
- removed = true;
-
- if (mei_clear_list(dev, file, &dev->write_waiting_list.list))
- removed = true;
-
- if (mei_clear_list(dev, file, &dev->write_list.list))
- removed = true;
-
- /* check if iamthif_current_cb not NULL */
- if (dev->iamthif_current_cb && !removed) {
- /* check file and iamthif current cb association */
- if (dev->iamthif_current_cb->fp == file) {
- /* remove cb */
- mei_io_cb_free(dev->iamthif_current_cb);
- dev->iamthif_current_cb = NULL;
- removed = true;
- }
- }
- return removed;
+ list_for_each_entry_safe(cb, next, mei_cb_list, list)
+ if (file == cb->fp)
+ mei_io_cb_free(cb);
}
/**
@@ -530,23 +341,21 @@ static bool mei_clear_lists(struct mei_device *dev, const struct file *file)
*/
int mei_amthif_release(struct mei_device *dev, struct file *file)
{
+ struct mei_cl *cl = file->private_data;
+
if (dev->iamthif_open_count > 0)
dev->iamthif_open_count--;
- if (dev->iamthif_fp == file &&
- dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+ if (cl->fp == file && dev->iamthif_state != MEI_IAMTHIF_IDLE) {
dev_dbg(dev->dev, "amthif canceled iamthif state %d\n",
dev->iamthif_state);
dev->iamthif_canceled = true;
- if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
- dev_dbg(dev->dev, "run next amthif iamthif cb\n");
- mei_amthif_run_next_cmd(dev);
- }
}
- if (mei_clear_lists(dev, file))
- dev->iamthif_state = MEI_IAMTHIF_IDLE;
+ mei_clear_list(file, &dev->amthif_cmd_list.list);
+ mei_clear_list(file, &cl->rd_completed);
+ mei_clear_list(file, &dev->ctrl_rd_list.list);
return 0;
}