/**
* @brief Add a new state transition work item to the state transition
* thread work item list.
*
* @param mhi_dev_ctxt [IN ] The mhi_dev_ctxt context
* @param new_state The state we wish to transition to
*
* @return MHI_STATUS
*/
MHI_STATUS mhi_init_state_transition(mhi_device_ctxt *mhi_dev_ctxt,
STATE_TRANSITION new_state)
{
unsigned long flags = 0;
MHI_STATUS ret_val = MHI_STATUS_SUCCESS;
volatile STATE_TRANSITION *cur_work_item = NULL;
s32 nr_avail_work_items = 0;
mhi_ring *stt_ring =
&mhi_dev_ctxt->state_change_work_item_list.q_info;
mhi_state_work_queue *work_q =
&mhi_dev_ctxt->state_change_work_item_list;
spin_lock_irqsave(work_q->q_lock, flags);
nr_avail_work_items = get_nr_avail_ring_elements(stt_ring);
if (0 >= nr_avail_work_items) {
mhi_log(MHI_MSG_CRITICAL, "No Room left on STT work queue\n");
return MHI_STATUS_ERROR;
}
mhi_log(MHI_MSG_VERBOSE,
"Processing state transition %x\n",
new_state);
*(STATE_TRANSITION *)stt_ring->wp = new_state;
ret_val = ctxt_add_element(stt_ring, (void **)&cur_work_item);
wmb();
MHI_ASSERT(MHI_STATUS_SUCCESS == ret_val,
"Failed to add selement to STT workqueue\n");
spin_unlock_irqrestore(work_q->q_lock, flags);
wake_up_interruptible(mhi_dev_ctxt->state_change_event_handle);
return ret_val;
}
static ssize_t mhi_dbgfs_chan_read(struct file *fp, char __user *buf,
size_t count, loff_t *offp)
{
int amnt_copied = 0;
struct mhi_chan_ctxt *chan_ctxt;
struct mhi_device_ctxt *mhi_dev_ctxt =
&mhi_devices.device_list[0].mhi_ctxt;
uintptr_t v_wp_index;
uintptr_t v_rp_index;
int valid_chan = 0;
struct mhi_chan_ctxt *cc_list;
struct mhi_client_handle *client_handle;
if (NULL == mhi_dev_ctxt)
return -EIO;
cc_list = mhi_dev_ctxt->mhi_ctrl_seg->mhi_cc_list;
*offp = (u32)(*offp) % MHI_MAX_CHANNELS;
while (!valid_chan) {
client_handle = mhi_dev_ctxt->client_handle_list[*offp];
if (*offp == (MHI_MAX_CHANNELS - 1))
msleep(1000);
if (!VALID_CHAN_NR(*offp) ||
!cc_list[*offp].mhi_trb_ring_base_addr ||
!client_handle) {
*offp += 1;
*offp = (u32)(*offp) % MHI_MAX_CHANNELS;
continue;
}
valid_chan = 1;
}
chan_ctxt = &cc_list[*offp];
get_element_index(&mhi_dev_ctxt->mhi_local_chan_ctxt[*offp],
mhi_dev_ctxt->mhi_local_chan_ctxt[*offp].rp,
&v_rp_index);
get_element_index(&mhi_dev_ctxt->mhi_local_chan_ctxt[*offp],
mhi_dev_ctxt->mhi_local_chan_ctxt[*offp].wp,
&v_wp_index);
amnt_copied =
scnprintf(mhi_dev_ctxt->chan_info,
MHI_LOG_SIZE,
"%s0x%x %s %d %s 0x%x %s 0x%llx %s %p %s %p %s %lu %s %p %s %lu %s %d %s %d\n",
"chan:",
(unsigned int)*offp,
"pkts from dev:",
mhi_dev_ctxt->counters.chan_pkts_xferd[*offp],
"state:",
chan_ctxt->mhi_chan_state,
"p_base:",
chan_ctxt->mhi_trb_ring_base_addr,
"v_base:",
mhi_dev_ctxt->mhi_local_chan_ctxt[*offp].base,
"v_wp:",
mhi_dev_ctxt->mhi_local_chan_ctxt[*offp].wp,
"index:",
v_wp_index,
"v_rp:",
mhi_dev_ctxt->mhi_local_chan_ctxt[*offp].rp,
"index:",
v_rp_index,
"pkts_queued",
get_nr_avail_ring_elements(
&mhi_dev_ctxt->mhi_local_chan_ctxt[*offp]),
"/",
client_handle->chan_info.max_desc);
*offp += 1;
if (amnt_copied < count)
return amnt_copied -
copy_to_user(buf, mhi_dev_ctxt->chan_info, amnt_copied);
else
return -ENOMEM;
}
