/**
* Setup mobicore kernel log. It assumes it's running on CORE 0!
* The fastcall will complain is that is not the case!
*/
long mobicore_log_setup(void *data)
{
unsigned long phys_log_buf;
union fc_generic fc_log;
long ret;
log_pos = 0;
log_buf = NULL;
log_thread = NULL;
log_line = NULL;
log_line_len = 0;
/* Sanity check for the log size */
if (log_size < PAGE_SIZE)
return -EFAULT;
else
log_size = PAGE_ALIGN(log_size);
log_line = kzalloc(LOG_LINE_SIZE, GFP_KERNEL);
if (IS_ERR(log_line)) {
MCDRV_DBG_ERROR("failed to allocate log line!");
return -ENOMEM;
}
log_thread = kthread_create(log_worker, NULL, "mobicore_log");
if (IS_ERR(log_thread)) {
MCDRV_DBG_ERROR("mobicore log thread creation failed!");
ret = -EFAULT;
goto mobicore_log_setup_log_line;
}
/* We are going to map this buffer into virtual address space in SWd.
* To reduce complexity there, we use a contiguous buffer. */
log_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(log_size));
if (!log_buf) {
MCDRV_DBG_ERROR("Failed to get page for logger!");
ret = -ENOMEM;
goto mobicore_log_setup_kthread;
}
phys_log_buf = virt_to_phys(log_buf);
memset(&fc_log, 0, sizeof(fc_log));
fc_log.as_in.cmd = MC_FC_NWD_TRACE;
fc_log.as_in.param[0] = phys_log_buf;
fc_log.as_in.param[1] = log_size;
MCDRV_DBG("fc_log virt=%p phys=%p ", log_buf, (void *)phys_log_buf);
mc_fastcall(&fc_log);
MCDRV_DBG("fc_log out ret=0x%08x", fc_log.as_out.ret);
/* If the setup failed we must free the memory allocated */
if (fc_log.as_out.ret) {
MCDRV_DBG_ERROR("MobiCore shared traces setup failed!");
free_pages((unsigned long)log_buf, get_order(log_size));
log_buf = NULL;
ret = -EIO;
goto mobicore_log_setup_kthread;
}
MCDRV_DBG("fc_log Logger version %u\n", log_buf->version);
return 0;
mobicore_log_setup_kthread:
kthread_stop(log_thread);
log_thread = NULL;
mobicore_log_setup_log_line:
kfree(log_line);
log_line = NULL;
return ret;
}
/*
* Setup MobiCore kernel log. It assumes it's running on CORE 0!
* The fastcall will complain is that is not the case!
*/
long mobicore_log_setup(void)
{
unsigned long phys_log_buf;
union fc_generic fc_log;
struct sched_param param = { .sched_priority = 1 };
long ret;
log_pos = 0;
log_buf = NULL;
log_thread = NULL;
log_line = NULL;
log_line_len = 0;
/* Sanity check for the log size */
if (log_size < PAGE_SIZE)
return -EFAULT;
else
log_size = PAGE_ALIGN(log_size);
log_line = kzalloc(LOG_LINE_SIZE, GFP_KERNEL);
if (IS_ERR(log_line)) {
MCDRV_DBG_ERROR(mcd, "failed to allocate log line!");
return -ENOMEM;
}
log_thread = kthread_create(log_worker, NULL, "mobicore_log");
if (IS_ERR(log_thread)) {
MCDRV_DBG_ERROR(mcd, "MobiCore log thread creation failed!");
ret = -EFAULT;
goto mobicore_log_setup_log_line;
}
sched_setscheduler(log_thread, SCHED_IDLE, ¶m);
/*
* We are going to map this buffer into virtual address space in SWd.
* To reduce complexity there, we use a contiguous buffer.
*/
log_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(log_size));
if (!log_buf) {
MCDRV_DBG_ERROR(mcd, "Failed to get page for logger!");
ret = -ENOMEM;
goto mobicore_log_setup_kthread;
}
phys_log_buf = virt_to_phys(log_buf);
memset(&fc_log, 0, sizeof(fc_log));
fc_log.as_in.cmd = MC_FC_NWD_TRACE;
fc_log.as_in.param[0] = phys_log_buf;
fc_log.as_in.param[1] = log_size;
MCDRV_DBG(mcd, "fc_log virt=%p phys=%p ",
log_buf, (void *)phys_log_buf);
mc_fastcall(&fc_log);
MCDRV_DBG(mcd, "fc_log out ret=0x%08x", fc_log.as_out.ret);
/* If the setup failed we must free the memory allocated */
if (fc_log.as_out.ret) {
MCDRV_DBG_ERROR(mcd, "MobiCore shared traces setup failed!");
free_pages((unsigned long)log_buf, get_order(log_size));
log_buf = NULL;
ret = -EIO;
goto mobicore_log_setup_kthread;
}
MCDRV_DBG(mcd, "fc_log Logger version %u\n", log_buf->version);
return 0;
mobicore_log_setup_kthread:
kthread_stop(log_thread);
log_thread = NULL;
mobicore_log_setup_log_line:
kfree(log_line);
log_line = NULL;
return ret;
}
/*
* Free kernel log components.
* ATTN: We can't free the log buffer because it's also in use by MobiCore and
* even if the module is unloaded MobiCore is still running.
*/
void mobicore_log_free(void)
{
if (log_thread && !IS_ERR(log_thread)) {
/* We don't really care what the thread returns for exit */
kthread_stop(log_thread);
}
kfree(log_line);
}