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runtime/kernel/dma: reduced replay overhead

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We can just flush the cache once when we get the handle, instead of
everytime before replay.
This commit is contained in:
pca006132 2020-09-09 21:16:46 +08:00
parent 1e742cc390
commit 02b386dee6
1 changed files with 2 additions and 4 deletions
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6
src/runtime/src/kernel/dma.rs
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@ -7,7 +7,6 @@ use alloc::{vec::Vec, string::String, boxed::Box};
use cslice::CSlice;
use super::{KERNEL_IMAGE, KERNEL_CHANNEL_0TO1, KERNEL_CHANNEL_1TO0, Message};
use core::mem;
use log::debug;
use libcortex_a9::cache::dcci_slice;
@ -160,6 +159,7 @@ pub extern fn dma_retrieve(name: CSlice<u8>) -> DmaTrace {
// trailing zero to indicate end of buffer
v.push(0);
v.copy_within(0..original_length, padding);
dcci_slice(&v);
let v = Box::new(v);
let address = Box::into_raw(v) as *mut Vec<u8> as i32;
return DmaTrace {
@ -174,12 +174,10 @@ pub extern fn dma_retrieve(name: CSlice<u8>) -> DmaTrace {
}
pub extern fn dma_playback(timestamp: i64, ptr: i32) {
debug!("DMA playback started");
unsafe {
let v = Box::from_raw(ptr as *mut Vec<u8>);
let padding = ALIGNMENT - v.as_ptr() as usize % ALIGNMENT;
let padding = if padding == ALIGNMENT { 0 } else { padding };
dcci_slice(&v[padding..]);
let ptr = v.as_ptr().add(padding) as i32;
csr::rtio_dma::base_address_write(ptr as u32);
@ -190,8 +188,8 @@ pub extern fn dma_playback(timestamp: i64, ptr: i32) {
while csr::rtio_dma::enable_read() != 0 {}
csr::cri_con::selected_write(0);
// leave the handle as we may try to do playback for another time.
mem::forget(v);
debug!("DMA playback finished");
let error = csr::rtio_dma::error_read();
if error != 0 {