/*
* Update the current task's runtime statistics. Skip current tasks that
* are not in our scheduling class.
*/
static inline void update_curr_rt(struct rq *rq)
{
struct task_struct *curr = rq->curr;
u64 delta_exec;
if (!task_has_rt_policy(curr))
return;
delta_exec = rq->clock - curr->se.exec_start;
if (unlikely((s64)delta_exec < 0))
delta_exec = 0;
schedstat_set(curr->se.exec_max, max(curr->se.exec_max, delta_exec));
curr->se.sum_exec_runtime += delta_exec;
curr->se.exec_start = rq->clock;
}
static ssize_t lpa_if_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct lpa_if *lpa_if = file->private_data;
struct audio_buffer *ab;
const char __user *start = buf;
int xfer, rc;
struct sched_param s = { .sched_priority = 1 };
int old_prio = current->rt_priority;
int old_policy = current->policy;
int cap_nice = cap_raised(current_cap(), CAP_SYS_NICE);
/* just for this write, set us real-time */
if (!task_has_rt_policy(current)) {
struct cred *new = prepare_creds();
cap_raise(new->cap_effective, CAP_SYS_NICE);
commit_creds(new);
if ((sched_setscheduler(current, SCHED_RR, &s)) < 0)
pr_err("sched_setscheduler failed\n");
}
mutex_lock(&lpa_if->lock);
if (dma_buf_index < 2) {
ab = lpa_if->audio_buf + dma_buf_index;
if (copy_from_user(ab->data, buf, count)) {
pr_err("copy from user failed\n");
rc = 0;
goto end;
}
mb();
pr_debug("prefill: count %u audio_buf[%u].size %u\n",
count, dma_buf_index, ab->size);
ab->used = 1;
dma_buf_index++;
rc = count;
goto end;
}
if (lpa_if->config != 1) {
pr_err("AUDIO_START did not happen\n");
rc = 0;
goto end;
}
while (count > 0) {
ab = lpa_if->audio_buf + lpa_if->cpu_buf;
rc = wait_event_timeout(lpa_if->wait, (ab->used == 0), 10 * HZ);
if (!rc) {
pr_err("wait_event_timeout failed\n");
rc = buf - start;
goto end;
}
xfer = count;
if (xfer > lpa_if->dma_period_sz)
xfer = lpa_if->dma_period_sz;
if (copy_from_user(ab->data, buf, xfer)) {
pr_err("copy from user failed\n");
rc = buf - start;
goto end;
}
mb();
buf += xfer;
count -= xfer;
ab->used = 1;
pr_debug("xfer %d, size %d, used %d cpu_buf %d\n",
xfer, ab->size, ab->used, lpa_if->cpu_buf);
lpa_if->cpu_buf++;
lpa_if->cpu_buf = lpa_if->cpu_buf % lpa_if->cfg.buffer_count;
}
rc = buf - start;
end:
mutex_unlock(&lpa_if->lock);
/* restore old scheduling policy */
if (!rt_policy(old_policy)) {
struct sched_param v = { .sched_priority = old_prio };
if ((sched_setscheduler(current, old_policy, &v)) < 0)
pr_err("sched_setscheduler failed\n");
if (likely(!cap_nice)) {
struct cred *new = prepare_creds();
cap_lower(new->cap_effective, CAP_SYS_NICE);
commit_creds(new);
}
}
return rc;
}
static int lpa_if_release(struct inode *inode, struct file *file)
{
struct lpa_if *lpa_if = file->private_data;
hdmi_audio_packet_enable(0);
wait_for_dma_cnt_stop(lpa_if->dma_ch);
hdmi_audio_enable(0, HDMI_AUDIO_FIFO_WATER_MARK);
if (lpa_if->config) {
unregister_dma_irq_handler(lpa_if->dma_ch);
dai_stop_hdmi(lpa_if->dma_ch);
lpa_if->config = 0;
}
core_req_bus_bandwith(AUDIO_IF_BUS_ID, 0, 0);
if (hdmi_msm_audio_get_sample_rate() != HDMI_SAMPLE_RATE_48KHZ)
hdmi_msm_audio_sample_rate_reset(HDMI_SAMPLE_RATE_48KHZ);
return 0;
}
static const struct file_operations lpa_if_fops = {
.owner = THIS_MODULE,
.open = lpa_if_open,
.write = lpa_if_write,
.release = lpa_if_release,
.unlocked_ioctl = lpa_if_ioctl,
};
struct miscdevice lpa_if_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "msm_lpa_if_out",
.fops = &lpa_if_fops,
};
static int __init lpa_if_init(void)
{
int rc;
lpa_if_ptr = kzalloc(sizeof(struct lpa_if), GFP_KERNEL);
if (!lpa_if_ptr) {
pr_info("No mem for lpa-if\n");
return -ENOMEM;
}
mutex_init(&lpa_if_ptr->lock);
init_waitqueue_head(&lpa_if_ptr->wait);
lpa_if_ptr->buffer = dma_alloc_coherent(NULL, DMA_ALLOC_BUF_SZ,
&(lpa_if_ptr->buffer_phys), GFP_KERNEL);
if (!lpa_if_ptr->buffer) {
pr_err("dma_alloc_coherent failed\n");
kfree(lpa_if_ptr);
return -ENOMEM;
}
pr_info("lpa_if_ptr 0x%08x buf_vir 0x%08x buf_phy 0x%08x "
" buf_zise %u\n", (u32)lpa_if_ptr,
(u32)(lpa_if_ptr->buffer), lpa_if_ptr->buffer_phys,
DMA_ALLOC_BUF_SZ);
rc = misc_register(&lpa_if_misc);
if (rc < 0) {
pr_err("misc_register failed\n");
dma_free_coherent(NULL, DMA_ALLOC_BUF_SZ, lpa_if_ptr->buffer,
lpa_if_ptr->buffer_phys);
kfree(lpa_if_ptr);
}
return rc;
}
device_initcall(lpa_if_init);
// Jagan-
static ssize_t pcm_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct pcm *pcm = file->private_data;
struct audio_client *ac;
struct audio_buffer *ab;
const char __user *start = buf;
int xfer;
#if 0
// Jagan+
if(!task_has_rt_policy(current))
{
struct sched_param param = { .sched_priority = 99 };
printk(KERN_INFO "pcm_write to change to RT tid = %d\n", current->pid);
if(sched_setscheduler_nocheck(current, SCHED_FIFO, ¶m )!=0)
{
printk(KERN_ERR "pcm_write fail to change to RT\n");
}
}
// Jagan-
#endif
if (!pcm->ac)
pcm_ioctl(file, AUDIO_START, 0);
ac = pcm->ac;
if (!ac)
return -ENODEV;
while (count > 0) {
ab = ac->buf + ac->cpu_buf;
if (ab->used)
if (!wait_event_timeout(ac->wait, (ab->used == 0), 5*HZ)) {
audio_client_dump(ac);
pr_err("[%s:%s] timeout. dsp dead?\n",
__MM_FILE__, __func__);
q6audio_dsp_not_responding();
}
xfer = count;
if (xfer > ab->size)
xfer = ab->size;
if (copy_from_user(ab->data, buf, xfer))
return -EFAULT;
buf += xfer;
count -= xfer;
ab->used = 1;
ab->actual_size = xfer;
q6audio_write(ac, ab);
ac->cpu_buf ^= 1;
}
return buf - start;
}
static int pcm_release(struct inode *inode, struct file *file)
{
struct pcm *pcm = file->private_data;
if (pcm->ac)
q6audio_close(pcm->ac);
kfree(pcm);
pr_info("[%s:%s] release\n", __MM_FILE__, __func__);
// Jagan+
if (unlikely(1 == Is_first_boot_flag))
Is_first_boot_flag = 0;
// Jagan-
return 0;
}
static struct file_operations pcm_fops = {
.owner = THIS_MODULE,
.open = pcm_open,
.write = pcm_write,
.release = pcm_release,
.unlocked_ioctl = pcm_ioctl,
};
struct miscdevice pcm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "msm_pcm_out",
.fops = &pcm_fops,
};
static int __init pcm_init(void) {
return misc_register(&pcm_misc);
}
device_initcall(pcm_init);