static ssize_t ilo_write(struct file *fp, const char __user *buf,
size_t len, loff_t *off)
{
int err, pkt_id, pkt_len;
struct ccb_data *data = fp->private_data;
struct ccb *driver_ccb = &data->driver_ccb;
struct ilo_hwinfo *hw = data->ilo_hw;
void *pkt;
if (is_channel_reset(driver_ccb))
return -ENODEV;
/* get a packet to send the user command */
if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
return -EBUSY;
/* limit the length to the length of the packet */
if (pkt_len < len)
len = pkt_len;
/* on failure, set the len to 0 to return empty packet to the device */
err = copy_from_user(pkt, buf, len);
if (err)
len = 0;
/* send the packet */
ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
doorbell_set(driver_ccb);
return err ? -EFAULT : len;
}
static ssize_t ilo_write(struct file *fp, const char __user *buf,
size_t len, loff_t *off)
{
int err, pkt_id, pkt_len;
struct ccb_data *data = fp->private_data;
struct ccb *driver_ccb = &data->driver_ccb;
struct ilo_hwinfo *hw = data->ilo_hw;
void *pkt;
if (is_channel_reset(driver_ccb))
return -ENODEV;
/* */
if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
return -EBUSY;
/* */
if (pkt_len < len)
len = pkt_len;
/* */
err = copy_from_user(pkt, buf, len);
if (err)
len = 0;
/* */
ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
doorbell_set(driver_ccb);
return err ? -EFAULT : len;
}
static ssize_t ilo_read(struct file *fp, char __user *buf,
size_t len, loff_t *off)
{
int err, found, cnt, pkt_id, pkt_len;
struct ccb_data *data = fp->private_data;
struct ccb *driver_ccb = &data->driver_ccb;
struct ilo_hwinfo *hw = data->ilo_hw;
void *pkt;
if (is_channel_reset(driver_ccb)) {
/*
* If the device has been reset, applications
* need to close and reopen all ccbs.
*/
return -ENODEV;
}
/*
* This function is to be called when data is expected
* in the channel, and will return an error if no packet is found
* during the loop below. The sleep/retry logic is to allow
* applications to call read() immediately post write(),
* and give iLO some time to process the sent packet.
*/
cnt = 20;
do {
/* look for a received packet */
found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
&pkt_len, &pkt);
if (found)
break;
cnt--;
msleep(100);
} while (!found && cnt);
if (!found)
return -EAGAIN;
/* only copy the length of the received packet */
if (pkt_len < len)
len = pkt_len;
err = copy_to_user(buf, pkt, len);
/* return the received packet to the queue */
ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
return err ? -EFAULT : len;
}
static ssize_t ilo_read(struct file *fp, char __user *buf,
size_t len, loff_t *off)
{
int err, found, cnt, pkt_id, pkt_len;
struct ccb_data *data = fp->private_data;
struct ccb *driver_ccb = &data->driver_ccb;
struct ilo_hwinfo *hw = data->ilo_hw;
void *pkt;
if (is_channel_reset(driver_ccb)) {
/*
*/
return -ENODEV;
}
/*
*/
cnt = 20;
do {
/* */
found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
&pkt_len, &pkt);
if (found)
break;
cnt--;
msleep(100);
} while (!found && cnt);
if (!found)
return -EAGAIN;
/* */
if (pkt_len < len)
len = pkt_len;
err = copy_to_user(buf, pkt, len);
/* */
ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, desc_mem_sz(1));
return err ? -EFAULT : len;
}
static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data)
{
int pkt_id, i;
struct ccb *driver_ccb = &data->driver_ccb;
/* make sure iLO is really handling requests */
for (i = MAX_WAIT; i > 0; i--) {
if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
break;
udelay(WAIT_TIME);
}
if (i == 0) {
dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n");
return -EBUSY;
}
ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
doorbell_set(driver_ccb);
return 0;
}