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/* Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include "mhi_sys.h"
#include "mhi_trace.h"
static int mhi_process_event_ring(
struct mhi_device_ctxt *mhi_dev_ctxt,
u32 ev_index,
u32 event_quota)
{
union mhi_event_pkt *local_rp = NULL;
union mhi_event_pkt *device_rp = NULL;
union mhi_event_pkt event_to_process;
int count = 0;
struct mhi_event_ctxt *ev_ctxt = NULL;
unsigned long flags;
struct mhi_ring *local_ev_ctxt =
&mhi_dev_ctxt->mhi_local_event_ctxt[ev_index];
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Enter ev_index:%u\n", ev_index);
read_lock_bh(&mhi_dev_ctxt->pm_xfer_lock);
if (unlikely(MHI_EVENT_ACCESS_INVALID(mhi_dev_ctxt->mhi_pm_state))) {
mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
"No event access, PM_STATE:0x%x\n",
mhi_dev_ctxt->mhi_pm_state);
read_unlock_bh(&mhi_dev_ctxt->pm_xfer_lock);
return -EIO;
}
mhi_dev_ctxt->assert_wake(mhi_dev_ctxt, false);
read_unlock_bh(&mhi_dev_ctxt->pm_xfer_lock);
ev_ctxt = &mhi_dev_ctxt->dev_space.ring_ctxt.ec_list[ev_index];
spin_lock_irqsave(&local_ev_ctxt->ring_lock, flags);
device_rp = (union mhi_event_pkt *)mhi_p2v_addr(
mhi_dev_ctxt,
MHI_RING_TYPE_EVENT_RING,
ev_index,
ev_ctxt->mhi_event_read_ptr);
local_rp = (union mhi_event_pkt *)local_ev_ctxt->rp;
spin_unlock_irqrestore(&local_ev_ctxt->ring_lock, flags);
BUG_ON(validate_ev_el_addr(local_ev_ctxt, (uintptr_t)device_rp));
while ((local_rp != device_rp) && (event_quota > 0) &&
(device_rp != NULL) && (local_rp != NULL)) {
spin_lock_irqsave(&local_ev_ctxt->ring_lock, flags);
event_to_process = *local_rp;
recycle_trb_and_ring(mhi_dev_ctxt,
local_ev_ctxt,
MHI_RING_TYPE_EVENT_RING,
ev_index);
spin_unlock_irqrestore(&local_ev_ctxt->ring_lock, flags);
switch (MHI_TRB_READ_INFO(EV_TRB_TYPE, &event_to_process)) {
case MHI_PKT_TYPE_CMD_COMPLETION_EVENT:
{
union mhi_cmd_pkt *cmd_pkt;
u32 chan;
struct mhi_chan_cfg *cfg;
unsigned long flags;
struct mhi_ring *cmd_ring = &mhi_dev_ctxt->
mhi_local_cmd_ctxt[PRIMARY_CMD_RING];
__pm_stay_awake(&mhi_dev_ctxt->w_lock);
__pm_relax(&mhi_dev_ctxt->w_lock);
get_cmd_pkt(mhi_dev_ctxt,
&event_to_process,
&cmd_pkt, ev_index);
MHI_TRB_GET_INFO(CMD_TRB_CHID, cmd_pkt, chan);
cfg = &mhi_dev_ctxt->mhi_chan_cfg[chan];
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"MHI CCE received ring 0x%x chan:%u\n",
ev_index, chan);
spin_lock_irqsave(&cfg->event_lock, flags);
cfg->cmd_pkt = *cmd_pkt;
cfg->cmd_event_pkt =
event_to_process.cmd_complete_event_pkt;
complete(&cfg->cmd_complete);
spin_unlock_irqrestore(&cfg->event_lock, flags);
spin_lock_irqsave(&cmd_ring->ring_lock,
flags);
ctxt_del_element(cmd_ring, NULL);
spin_unlock_irqrestore(&cmd_ring->ring_lock,
flags);
break;
}
case MHI_PKT_TYPE_TX_EVENT:
{
u32 chan;
struct mhi_ring *ring;
unsigned long flags;
__pm_stay_awake(&mhi_dev_ctxt->w_lock);
chan = MHI_EV_READ_CHID(EV_CHID, &event_to_process);
if (unlikely(!VALID_CHAN_NR(chan))) {
mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
"Invalid chan:%d\n", chan);
break;
}
ring = &mhi_dev_ctxt->mhi_local_chan_ctxt[chan];
spin_lock_irqsave(&ring->ring_lock, flags);
if (ring->ch_state == MHI_CHAN_STATE_ENABLED)
parse_xfer_event(mhi_dev_ctxt,
&event_to_process,
ev_index);
spin_unlock_irqrestore(&ring->ring_lock, flags);
__pm_relax(&mhi_dev_ctxt->w_lock);
event_quota--;
break;
}
case MHI_PKT_TYPE_STATE_CHANGE_EVENT:
{
enum STATE_TRANSITION new_state;
unsigned long flags;
new_state = MHI_READ_STATE(&event_to_process);
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"MHI STE received ring 0x%x State:%s\n",
ev_index, state_transition_str(new_state));
switch (new_state) {
case STATE_TRANSITION_M0:
process_m0_transition(mhi_dev_ctxt);
break;
case STATE_TRANSITION_M1:
write_lock_irqsave(&mhi_dev_ctxt->pm_xfer_lock,
flags);
mhi_dev_ctxt->mhi_state =
mhi_get_m_state(mhi_dev_ctxt);
if (mhi_dev_ctxt->mhi_state == MHI_STATE_M1) {
enum MHI_PM_STATE state;
state = mhi_tryset_pm_state
(mhi_dev_ctxt, MHI_PM_M1);
if (state == MHI_PM_M1) {
mhi_dev_ctxt->counters.m0_m1++;
schedule_work
(&mhi_dev_ctxt->
process_m1_worker);
}
}
write_unlock_irqrestore(&mhi_dev_ctxt->
pm_xfer_lock, flags);
break;
case STATE_TRANSITION_M3:
process_m3_transition(mhi_dev_ctxt);
break;
case STATE_TRANSITION_SYS_ERR:
{
enum MHI_PM_STATE new_state;
unsigned long flags;
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"MHI System Error Detected\n");
write_lock_irqsave(&mhi_dev_ctxt->pm_xfer_lock,
flags);
new_state = mhi_tryset_pm_state
(mhi_dev_ctxt, MHI_PM_SYS_ERR_DETECT);
write_unlock_irqrestore
(&mhi_dev_ctxt->pm_xfer_lock, flags);
if (new_state == MHI_PM_SYS_ERR_DETECT)
schedule_work(&mhi_dev_ctxt->
process_sys_err_worker);
break;
}
default:
mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
"Unsupported STE received ring 0x%x State:%s\n",
ev_index,
state_transition_str(new_state));
}
break;
}
case MHI_PKT_TYPE_EE_EVENT:
{
enum STATE_TRANSITION new_state = 0;
enum MHI_EXEC_ENV event =
MHI_READ_EXEC_ENV(&event_to_process);
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"MHI EE received ring 0x%x event:0x%x\n",
ev_index, event);
__pm_stay_awake(&mhi_dev_ctxt->w_lock);
__pm_relax(&mhi_dev_ctxt->w_lock);
switch (event) {
case MHI_EXEC_ENV_SBL:
new_state = STATE_TRANSITION_SBL;
break;
case MHI_EXEC_ENV_AMSS:
new_state = STATE_TRANSITION_AMSS;
break;
case MHI_EXEC_ENV_BHIE:
new_state = STATE_TRANSITION_BHIE;
break;
case MHI_EXEC_ENV_RDDM:
new_state = STATE_TRANSITION_RDDM;
break;
default:
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"Invalid EE Event 0x%x received\n",
event);
}
if (new_state)
mhi_init_state_transition(mhi_dev_ctxt,
new_state);
break;
}
case MHI_PKT_TYPE_STALE_EVENT:
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"Stale Event received for chan:%u\n",
MHI_EV_READ_CHID(EV_CHID, local_rp));
break;
default:
mhi_log(mhi_dev_ctxt, MHI_MSG_ERROR,
"Unsupported packet type code 0x%x\n",
MHI_TRB_READ_INFO(EV_TRB_TYPE,
&event_to_process));
break;
}
spin_lock_irqsave(&local_ev_ctxt->ring_lock, flags);
local_rp = (union mhi_event_pkt *)local_ev_ctxt->rp;
device_rp = (union mhi_event_pkt *)mhi_p2v_addr(
mhi_dev_ctxt,
MHI_RING_TYPE_EVENT_RING,
ev_index,
ev_ctxt->mhi_event_read_ptr);
spin_unlock_irqrestore(&local_ev_ctxt->ring_lock, flags);
count++;
}
read_lock_bh(&mhi_dev_ctxt->pm_xfer_lock);
mhi_dev_ctxt->deassert_wake(mhi_dev_ctxt);
read_unlock_bh(&mhi_dev_ctxt->pm_xfer_lock);
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "exit ev_index:%u\n", ev_index);
return count;
}
void mhi_ev_task(unsigned long data)
{
struct mhi_ring *mhi_ring = (struct mhi_ring *)data;
struct mhi_device_ctxt *mhi_dev_ctxt =
mhi_ring->mhi_dev_ctxt;
int ev_index = mhi_ring->index;
const int CTRL_EV = 0; /* event ring for ctrl events */
int ret;
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Enter\n");
/* Process event ring */
ret = mhi_process_event_ring(mhi_dev_ctxt, ev_index, U32_MAX);
/*
* If we received MSI for primary event ring with no events to process
* check status register to see if device enter SYSERR status
*/
if (ev_index == CTRL_EV && !ret) {
bool in_sys_err = false;
unsigned long flags;
enum MHI_PM_STATE new_state;
read_lock_bh(&mhi_dev_ctxt->pm_xfer_lock);
if (MHI_REG_ACCESS_VALID(mhi_dev_ctxt->mhi_pm_state))
in_sys_err = mhi_in_sys_err(mhi_dev_ctxt);
read_unlock_bh(&mhi_dev_ctxt->pm_xfer_lock);
if (in_sys_err) {
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"MHI System Error Detected\n");
write_lock_irqsave(&mhi_dev_ctxt->pm_xfer_lock, flags);
new_state = mhi_tryset_pm_state(mhi_dev_ctxt,
MHI_PM_SYS_ERR_DETECT);
write_unlock_irqrestore(&mhi_dev_ctxt->pm_xfer_lock,
flags);
if (new_state == MHI_PM_SYS_ERR_DETECT)
schedule_work(&mhi_dev_ctxt->
process_sys_err_worker);
}
}
enable_irq(MSI_TO_IRQ(mhi_dev_ctxt, ev_index));
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Exit\n");
}
void process_event_ring(struct work_struct *work)
{
struct mhi_ring *mhi_ring =
container_of(work, struct mhi_ring, ev_worker);
struct mhi_device_ctxt *mhi_dev_ctxt =
mhi_ring->mhi_dev_ctxt;
int ev_index = mhi_ring->index;
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Enter\n");
/* Process event ring */
mhi_process_event_ring(mhi_dev_ctxt, ev_index, U32_MAX);
enable_irq(MSI_TO_IRQ(mhi_dev_ctxt, ev_index));
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Exit\n");
}
struct mhi_result *mhi_poll(struct mhi_client_handle *client_handle)
{
int ret_val;
struct mhi_client_config *client_config = client_handle->client_config;
client_config->result.buf_addr = NULL;
client_config->result.bytes_xferd = 0;
client_config->result.transaction_status = 0;
ret_val = mhi_process_event_ring(client_config->mhi_dev_ctxt,
client_config->event_ring_index,
1);
if (ret_val < 0)
mhi_log(client_config->mhi_dev_ctxt, MHI_MSG_INFO,
"NAPI failed to process event ring\n");
return &(client_config->result);
}
void mhi_mask_irq(struct mhi_client_handle *client_handle)
{
struct mhi_client_config *client_config = client_handle->client_config;
struct mhi_device_ctxt *mhi_dev_ctxt =
client_config->mhi_dev_ctxt;
struct mhi_ring *ev_ring = &mhi_dev_ctxt->
mhi_local_event_ctxt[client_config->event_ring_index];
disable_irq_nosync(MSI_TO_IRQ(mhi_dev_ctxt, client_config->msi_vec));
ev_ring->msi_disable_cntr++;
}
void mhi_unmask_irq(struct mhi_client_handle *client_handle)
{
struct mhi_client_config *client_config = client_handle->client_config;
struct mhi_device_ctxt *mhi_dev_ctxt =
client_config->mhi_dev_ctxt;
struct mhi_ring *ev_ring = &mhi_dev_ctxt->
mhi_local_event_ctxt[client_config->event_ring_index];
ev_ring->msi_enable_cntr++;
enable_irq(MSI_TO_IRQ(mhi_dev_ctxt, client_config->msi_vec));
}
irqreturn_t mhi_msi_handlr(int irq_number, void *dev_id)
{
struct mhi_device_ctxt *mhi_dev_ctxt = dev_id;
int msi = IRQ_TO_MSI(mhi_dev_ctxt, irq_number);
struct mhi_ring *mhi_ring = &mhi_dev_ctxt->mhi_local_event_ctxt[msi];
struct mhi_event_ring_cfg *ring_props =
&mhi_dev_ctxt->ev_ring_props[msi];
mhi_dev_ctxt->counters.msi_counter[
IRQ_TO_MSI(mhi_dev_ctxt, irq_number)]++;
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Got MSI 0x%x\n", msi);
trace_mhi_msi(IRQ_TO_MSI(mhi_dev_ctxt, irq_number));
disable_irq_nosync(irq_number);
if (ring_props->priority <= MHI_EV_PRIORITY_TASKLET)
tasklet_schedule(&mhi_ring->ev_task);
else
schedule_work(&mhi_ring->ev_worker);
return IRQ_HANDLED;
}
irqreturn_t mhi_msi_ipa_handlr(int irq_number, void *dev_id)
{
struct mhi_device_ctxt *mhi_dev_ctxt = dev_id;
struct mhi_event_ring_cfg *ev_ring_props;
struct mhi_client_handle *client_handle;
struct mhi_client_config *client_config;
struct mhi_client_info_t *client_info;
struct mhi_cb_info cb_info;
int msi_num = (IRQ_TO_MSI(mhi_dev_ctxt, irq_number));
mhi_dev_ctxt->counters.msi_counter[msi_num]++;
mhi_log(mhi_dev_ctxt, MHI_MSG_VERBOSE, "Got MSI 0x%x\n", msi_num);
trace_mhi_msi(msi_num);
/* Obtain client config from MSI */
ev_ring_props = &mhi_dev_ctxt->ev_ring_props[msi_num];
client_handle = mhi_dev_ctxt->client_handle_list[ev_ring_props->chan];
if (unlikely(!client_handle)) {
mhi_log(mhi_dev_ctxt, MHI_MSG_INFO,
"Recv MSI for unreg chan:%u\n", ev_ring_props->chan);
return IRQ_HANDLED;
}
client_config = client_handle->client_config;
client_info = &client_config->client_info;
client_config->result.user_data =
client_config->user_data;
cb_info.result = &client_config->result;
cb_info.cb_reason = MHI_CB_XFER;
cb_info.chan = client_config->chan_info.chan_nr;
cb_info.result->transaction_status = 0;
client_info->mhi_client_cb(&cb_info);
return IRQ_HANDLED;
}
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