subkernels: add support for (d)dma

artiq/firmware/ksupport/lib.rs

@@ -453,12 +453,39 @@ extern fn dma_playback(timestamp: i64, ptr: i32, _uses_ddma: bool) {
     }
 }
 
-#[cfg(not(kernel_has_rtio_dma))]
+#[cfg(all(not(kernel_has_rtio_dma), not(has_rtio_dma)))]
 #[unwind(allowed)]
 extern fn dma_playback(_timestamp: i64, _ptr: i32, _uses_ddma: bool) {
     unimplemented!("not(kernel_has_rtio_dma)")
 }
 
+// for satellite (has_rtio_dma but not in kernel)
+#[cfg(all(not(kernel_has_rtio_dma), has_rtio_dma))]
+#[unwind(allowed)]
+extern fn dma_playback(timestamp: i64, ptr: i32, _uses_ddma: bool) {
+    // DDMA is always used on satellites, so the `uses_ddma` setting is ignored
+    // StartRemoteRequest reused as "normal" start request
+    send(&DmaStartRemoteRequest { id: ptr as i32, timestamp: timestamp });
+    // skip awaitremoterequest - it's a given
+    recv!(&DmaAwaitRemoteReply { timeout, error, channel, timestamp } => {
+        if timeout {
+            raise!("DMAError",
+                "Error running DMA on satellite device, timed out waiting for results");
+        }
+        if error & 1 != 0 {
+            raise!("RTIOUnderflow",
+                "RTIO underflow at channel {rtio_channel_info:0}, {1} mu",
+                channel as i64, timestamp as i64, 0);
+        }
+        if error & 2 != 0 {
+            raise!("RTIODestinationUnreachable",
+                "RTIO destination unreachable, output, at channel {rtio_channel_info:0}, {1} mu",
+                channel as i64, timestamp as i64, 0);
+        }
+    });
+}
+
+
 #[unwind(allowed)]
 extern fn subkernel_load_run(id: u32, destination: u8, run: bool) {
     send(&SubkernelLoadRunRequest { id: id, destination: destination, run: run });

artiq/firmware/libproto_artiq/drtioaux_proto.rs

@@ -113,7 +113,7 @@ pub enum Packet {
         id: u32, status: PayloadStatus, 
         length: u16, trace: [u8; MASTER_PAYLOAD_MAX_SIZE] 
     },
-    DmaAddTraceReply { destination: u8, succeeded: bool },
+    DmaAddTraceReply { source: u8, destination: u8, id: u32, succeeded: bool },
     DmaRemoveTraceRequest { source: u8, destination: u8, id: u32 },
     DmaRemoveTraceReply { destination: u8, succeeded: bool },
     DmaPlaybackRequest { source: u8, destination: u8, id: u32, timestamp: u64 },
@@ -303,7 +303,9 @@ impl Packet {
                 }
             },
             0xb1 => Packet::DmaAddTraceReply {
+                source: reader.read_u8()?,
                 destination: reader.read_u8()?,
+                id: reader.read_u32()?,
                 succeeded: reader.read_bool()?
             },
             0xb2 => Packet::DmaRemoveTraceRequest {
@@ -598,9 +600,11 @@ impl Packet {
                 writer.write_u16(length)?;
                 writer.write_all(&trace[0..length as usize])?;
             },
-            Packet::DmaAddTraceReply { destination, succeeded } => {
+            Packet::DmaAddTraceReply { source, destination, id, succeeded } => {
                 writer.write_u8(0xb1)?;
+                writer.write_u8(source)?;
                 writer.write_u8(destination)?;
+                writer.write_u32(id)?;
                 writer.write_bool(succeeded)?;
             },
             Packet::DmaRemoveTraceRequest { source, destination, id } => {

artiq/firmware/runtime/rtio_dma.rs

@@ -167,10 +167,10 @@ pub mod remote_dma {
     }
 
     pub fn playback_done(io: &Io, ddma_mutex: &Mutex, 
-            id: u32, destination: u8, error: u8, channel: u32, timestamp: u64) {
+            id: u32, source: u8, error: u8, channel: u32, timestamp: u64) {
         // called upon receiving PlaybackDone aux packet
         let _lock = ddma_mutex.lock(io).unwrap();
-        let mut trace = unsafe { TRACES.get_mut(&id).unwrap().get_mut(&destination).unwrap() };
+        let mut trace = unsafe { TRACES.get_mut(&id).unwrap().get_mut(&source).unwrap() };
         trace.state = RemoteState::PlaybackEnded {
             error: error, 
             channel: channel, 

artiq/firmware/runtime/rtio_mgt.rs

@@ -491,8 +491,8 @@ pub mod drtio {
                 &drtioaux::Packet::DmaAddTraceRequest {
                     id: id, source: 0, destination: destination, status: status, length: len as u16, trace: *slice})?;
             match reply {
-                drtioaux::Packet::DmaAddTraceReply { destination: 0, succeeded: true } => Ok(()),
+                drtioaux::Packet::DmaAddTraceReply { destination: 0, succeeded: true, .. } => Ok(()),
-                drtioaux::Packet::DmaAddTraceReply { destination: 0, succeeded: false } => Err(Error::DmaAddTraceFail(destination)),
+                drtioaux::Packet::DmaAddTraceReply { destination: 0, succeeded: false, .. } => Err(Error::DmaAddTraceFail(destination)),
                 packet => Err(Error::UnexpectedPacket(packet)),
             }
         })

artiq/firmware/satman/dma.rs

@@ -1,7 +1,11 @@
+use alloc::{vec::Vec, collections::btree_map::BTreeMap, string::String};
+use core::mem;
+use board_artiq::{drtioaux, drtio_routing::RoutingTable};
 use board_misoc::{csr, cache::flush_l2_cache};
 use proto_artiq::drtioaux_proto::PayloadStatus;
-use alloc::{vec::Vec, collections::btree_map::BTreeMap};
+use routing::{Router, Sliceable};
-use ::{cricon_select, RtioMaster};
+use kernel::Manager as KernelManager;
+use ::{cricon_select, RtioMaster, MASTER_PAYLOAD_MAX_SIZE};
 
 const ALIGNMENT: usize = 64;
 
@@ -19,17 +23,158 @@ pub struct RtioStatus {
     pub timestamp: u64
 }
 
+#[derive(Debug)]
 pub enum Error {
     IdNotFound,
     PlaybackInProgress,
-    EntryNotComplete
+    EntryNotComplete,
+    MasterDmaFound,
+    UploadFail,
 }
 
 #[derive(Debug)]
 struct Entry {
     trace: Vec<u8>,
     padding_len: usize,
-    complete: bool
+    complete: bool,
+    duration: u64, // relevant for locally ran DMA
+}
+
+impl Entry {
+    pub fn from_vec(data: Vec<u8>, duration: u64) -> Entry {
+        let mut entry = Entry {
+            trace: data,
+            padding_len: 0,
+            complete: true,
+            duration: duration,
+        };
+        entry.realign();
+        entry
+    }
+
+    pub fn id(&self) -> u32 {
+        self.trace[self.padding_len..].as_ptr() as u32
+    }
+
+    pub fn realign(&mut self) {
+        self.trace.push(0);
+        let data_len = self.trace.len();
+
+        self.trace.reserve(ALIGNMENT - 1);
+        let padding = ALIGNMENT - self.trace.as_ptr() as usize % ALIGNMENT;
+        let padding = if padding == ALIGNMENT { 0 } else { padding };
+        for _ in 0..padding {
+            // Vec guarantees that this will not reallocate
+            self.trace.push(0)
+        }
+        for i in 1..data_len + 1 {
+            self.trace[data_len + padding - i] = self.trace[data_len - i]
+        }
+        self.complete = true;
+        self.padding_len = padding;
+    }
+}
+
+#[derive(Debug)]
+enum RemoteTraceState {
+    Unsent,
+    Sending(usize),
+    Ready,
+    Running(usize),
+}
+
+#[derive(Debug)]
+struct RemoteTraces {
+    remote_traces: BTreeMap<u8, Sliceable>,
+    state: RemoteTraceState,
+}
+
+impl RemoteTraces {
+    pub fn new(traces: BTreeMap<u8, Sliceable>) -> RemoteTraces {
+        RemoteTraces {
+            remote_traces: traces,
+            state: RemoteTraceState::Unsent
+        }
+    }
+
+    // on subkernel request
+    pub fn upload_traces(&mut self, id: u32, router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) -> usize {
+        let len = self.remote_traces.len();
+        if len > 0 {
+            self.state = RemoteTraceState::Sending(self.remote_traces.len());
+            for (dest, trace) in self.remote_traces.iter_mut() {
+                // queue up the first packet for all destinations, rest will be sent after first ACK
+                let mut data_slice: [u8; MASTER_PAYLOAD_MAX_SIZE] = [0; MASTER_PAYLOAD_MAX_SIZE];
+                let meta = trace.get_slice_master(&mut data_slice);
+                router.route(drtioaux::Packet::DmaAddTraceRequest {
+                    source: self_destination, destination: *dest, id: id,
+                    status: meta.status, length: meta.len, trace: data_slice
+                }, routing_table, rank, self_destination);
+            }
+        }
+        len
+    }
+
+    // on incoming Packet::DmaAddTraceReply
+    pub fn ack_upload(&mut self, kernel_manager: &mut KernelManager, source: u8, id: u32, succeeded: bool, router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) {
+        if let RemoteTraceState::Sending(count) = self.state {
+            if let Some(trace) = self.remote_traces.get_mut(&source) {
+                if trace.at_end() {
+                        if count - 1 == 0 {
+                            self.state = RemoteTraceState::Ready;
+                            kernel_manager.ddma_remote_uploaded(succeeded);
+                        } else {
+                            self.state = RemoteTraceState::Sending(count - 1);
+                        }
+                } else {
+                    // send next slice
+                    let mut data_slice: [u8; MASTER_PAYLOAD_MAX_SIZE] = [0; MASTER_PAYLOAD_MAX_SIZE];
+                    let meta = trace.get_slice_master(&mut data_slice);
+                    router.route(drtioaux::Packet::DmaAddTraceRequest {
+                        source: self_destination, destination: meta.destination, id: id,
+                        status: meta.status, length: meta.len, trace: data_slice
+                    }, routing_table, rank, self_destination);
+                }
+            }
+        }
+        
+    }
+
+    // on subkernel request
+    pub fn playback(&mut self, id: u32, timestamp: u64, router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) {
+        // route all the playback requests
+        // remote traces + local trace
+        self.state = RemoteTraceState::Running(self.remote_traces.len() + 1);
+        for (dest, _) in self.remote_traces.iter() {
+            router.route(drtioaux::Packet::DmaPlaybackRequest {
+                source: self_destination, destination: *dest, id: id, timestamp: timestamp
+            }, routing_table, rank, self_destination);
+            // response will be ignored (succeeded = false handled by the main thread)
+        }
+    }
+
+    // on incoming Packet::DmaPlaybackDone
+    pub fn remote_finished(&mut self, kernel_manager: &mut KernelManager, error: u8, channel: u32, timestamp: u64) {
+        if let RemoteTraceState::Running(count) = self.state {
+            if error != 0 || count - 1 == 0 {
+                // notify the kernel about a DDMA error or finish
+                kernel_manager.ddma_finished(error, channel, timestamp);
+                self.state = RemoteTraceState::Ready;
+                // further messages will be ignored (if there was an error)
+            } else { // no error and not the last one awaited
+                self.state = RemoteTraceState::Running(count - 1);
+            }
+        }
+    }
+
+    pub fn erase(&mut self, id: u32, router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) {
+        for (dest, _) in self.remote_traces.iter() {
+            router.route(drtioaux::Packet::DmaRemoveTraceRequest { 
+                source: self_destination, destination: *dest, id: id
+            }, routing_table, rank, self_destination);
+            // response will be ignored as this object will stop existing too
+        }
+    }
 }
 
 #[derive(Debug)]
@@ -37,7 +182,12 @@ pub struct Manager {
     entries: BTreeMap<(u8, u32), Entry>,
     state: ManagerState,
     current_id: u32,
-    current_source: u8
+    current_source: u8,
+
+    remote_entries: BTreeMap<u32, RemoteTraces>,
+    name_map: BTreeMap<String, u32>,
+    recording_trace: Vec<u8>,
+    recording_name: String
 }
 
 impl Manager {
@@ -52,6 +202,10 @@ impl Manager {
             current_id: 0,
             current_source: 0,
             state: ManagerState::Idle,
+            remote_entries: BTreeMap::new(),
+            name_map: BTreeMap::new(),
+            recording_trace: Vec::new(),
+            recording_name: String::new(),
         }
     }
 
@@ -67,7 +221,9 @@ impl Manager {
                     self.entries.insert((source, id), Entry {
                         trace: Vec::new(),
                         padding_len: 0,
-                        complete: false });
+                        complete: false,
+                        duration: 0
+                    });
                     self.entries.get_mut(&(source, id)).unwrap()
                 } else {
                     entry
@@ -77,34 +233,122 @@ impl Manager {
                 self.entries.insert((source, id), Entry {
                     trace: Vec::new(),
                     padding_len: 0,
-                    complete: false });
+                    complete: false,
+                    duration: 0,
+                });
                 self.entries.get_mut(&(source, id)).unwrap()
             },
         };
         entry.trace.extend(&trace[0..trace_len]);
 
         if status.is_last() {
-            entry.trace.push(0);
+            entry.realign();
-            let data_len = entry.trace.len();
-    
-            // Realign.
-            entry.trace.reserve(ALIGNMENT - 1);
-            let padding = ALIGNMENT - entry.trace.as_ptr() as usize % ALIGNMENT;
-            let padding = if padding == ALIGNMENT { 0 } else { padding };
-            for _ in 0..padding {
-                // Vec guarantees that this will not reallocate
-                entry.trace.push(0)
-            }
-            for i in 1..data_len + 1 {
-                entry.trace[data_len + padding - i] = entry.trace[data_len - i]
-            }
-            entry.complete = true;
-            entry.padding_len = padding;
             flush_l2_cache();
         }
         Ok(())
     }
+    // API for subkernel
+    pub fn record_start(&mut self, name: &str) {
+        self.recording_name = String::from(name);
+        self.recording_trace = Vec::new();
+    }
 
+    // API for subkernel
+    pub fn record_append(&mut self, data: &[u8]) {
+        self.recording_trace.extend_from_slice(data);
+    }
+
+    // API for subkernel
+    pub fn record_stop(&mut self, duration: u64, self_destination: u8) -> Result<u32, Error> {
+        let mut trace = Vec::new();
+        mem::swap(&mut self.recording_trace, &mut trace);
+        trace.push(0);
+        let mut local_trace = Vec::new();
+        let mut remote_traces: BTreeMap<u8, Sliceable> = BTreeMap::new();
+        // analyze each entry and put in proper buckets, as the kernel core
+        // sends whole chunks, to limit comms/kernel CPU communication,
+        // and as only comms core has access to varios DMA buffers.
+        let mut ptr = 0;
+        while trace[ptr] != 0 {
+            // ptr + 3 = tgt >> 24 (destination)
+            let len = trace[ptr] as usize;
+            let destination = trace[ptr+3];
+            if destination == 0 {
+                return Err(Error::MasterDmaFound);
+            } else if destination == self_destination {
+                local_trace.extend(&trace[ptr..ptr+len]);
+            }
+            else {
+                if let Some(remote_trace) = remote_traces.get_mut(&destination) {
+                    remote_trace.extend(&trace[ptr..ptr+len]);
+                } else {
+                    remote_traces.insert(destination, Sliceable::new(destination, trace[ptr..ptr+len].to_vec()));
+                }
+            }
+            // and jump to the next event
+            ptr += len;
+        }
+        let local_entry = Entry::from_vec(local_trace, duration);
+        let id = local_entry.id();
+
+        self.entries.insert((self_destination, id), local_entry);
+        self.remote_entries.insert(id, RemoteTraces::new(remote_traces));
+        let mut name = String::new();
+        mem::swap(&mut self.recording_name, &mut name);
+        self.name_map.insert(name, id);
+
+        flush_l2_cache();
+
+        Ok(id)
+    }
+
+    pub fn upload_traces(&mut self, id: u32, router: &mut Router, rank: u8, self_destination: u8,
+            routing_table: &RoutingTable) -> Result<usize, Error> {
+        let remote_traces = self.remote_entries.get_mut(&id);
+        let mut len = 0;
+        if let Some(traces) = remote_traces {
+            len = traces.upload_traces(id, router, rank, self_destination, routing_table);
+        }
+        Ok(len)
+    }
+
+    pub fn with_trace<F, R>(&self, self_destination: u8, name: &str, f: F) -> R
+        where F: FnOnce(Option<&[u8]>, u64) -> R {
+        if let Some(ptr) = self.name_map.get(name) {
+            match self.entries.get(&(self_destination, *ptr)) {
+                Some(entry) => f(Some(&entry.trace[entry.padding_len..]), entry.duration),
+                None => f(None, 0)
+            }
+        } else {
+            f(None, 0)
+        }
+    }
+
+    // API for subkernel
+    pub fn playback_remote(&mut self, id: u32, timestamp: u64, 
+        router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable
+    ) -> Result<(), Error> {
+        if let Some(traces) = self.remote_entries.get_mut(&id) {
+            traces.playback(id, timestamp, router, rank, self_destination, routing_table);
+            Ok(())
+        } else {
+            Err(Error::IdNotFound)
+        }
+    }
+
+    // API for subkernel
+    pub fn erase_name(&mut self, name: &str, router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) {
+        if let Some(id) = self.name_map.get(name) {
+            if let Some(traces) = self.remote_entries.get_mut(&id) {
+                traces.erase(*id, router, rank, self_destination, routing_table);
+                self.remote_entries.remove(&id);
+            }
+            self.entries.remove(&(self_destination, *id));
+            self.name_map.remove(name);
+        }
+    }
+
+    // API for incoming DDMA (drtio)
     pub fn erase(&mut self, source: u8, id: u32) -> Result<(), Error> {
         match self.entries.remove(&(source, id)) {
             Some(_) => Ok(()),
@@ -112,6 +356,33 @@ impl Manager {
         }
     }
 
+    pub fn remote_finished(&mut self, kernel_manager: &mut KernelManager, 
+        id: u32, error: u8, channel: u32, timestamp: u64) {
+        if let Some(entry) = self.remote_entries.get_mut(&id) {
+            entry.remote_finished(kernel_manager, error, channel, timestamp);
+        }
+    }
+
+    pub fn ack_upload(&mut self, kernel_manager: &mut KernelManager, source: u8, id: u32, succeeded: bool, 
+        router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) {
+            if let Some(entry) = self.remote_entries.get_mut(&id) {
+                entry.ack_upload(kernel_manager, source, id, succeeded, router, rank, self_destination, routing_table);
+            }
+    }
+
+    pub fn cleanup(&mut self, router: &mut Router, rank: u8, self_destination: u8, routing_table: &RoutingTable) {
+        // after subkernel ends, remove all self-generated traces
+        for (_, id) in self.name_map.iter_mut() {
+            if let Some(traces) = self.remote_entries.get_mut(&id) {
+                traces.erase(*id, router, rank, self_destination, routing_table);
+                self.remote_entries.remove(&id);
+            }
+            self.entries.remove(&(self_destination, *id));
+        }
+        self.name_map.clear();
+    }
+
+    // API for both incoming DDMA (drtio) and subkernel
     pub fn playback(&mut self, source: u8, id: u32, timestamp: u64) -> Result<(), Error> {
         if self.state != ManagerState::Idle {
             return Err(Error::PlaybackInProgress);

artiq/firmware/satman/kernel.rs

@@ -1,4 +1,4 @@
-use core::{mem, option::NoneError, cmp::min};
+use core::{mem, option::NoneError};
 use alloc::{string::String, format, vec::Vec, collections::{btree_map::BTreeMap, vec_deque::VecDeque}};
 use cslice::AsCSlice;
 
@@ -15,7 +15,8 @@ use kernel::eh_artiq::StackPointerBacktrace;
 
 use ::{cricon_select, RtioMaster};
 use cache::Cache;
-use routing::Router;
+use dma::{Manager as DmaManager, Error as DmaError};
+use routing::{Router, Sliceable, SliceMeta};
 use SAT_PAYLOAD_MAX_SIZE;
 use MASTER_PAYLOAD_MAX_SIZE;
 
@@ -65,7 +66,9 @@ enum KernelState {
     MsgAwait { max_time: u64, tags: Vec<u8> },
     MsgSending,
     SubkernelAwaitLoad,
-    SubkernelAwaitFinish { max_time: u64, id: u32 }
+    SubkernelAwaitFinish { max_time: u64, id: u32 },
+    DmaUploading { max_time: u64 },
+    DmaAwait { max_time: u64 },
 }
 
 #[derive(Debug)]
@@ -78,7 +81,8 @@ pub enum Error {
     AwaitingMessage,
     SubkernelIoError,
     DrtioError,
-    KernelException(Sliceable)
+    KernelException(Sliceable),
+    DmaError(DmaError),
 }
 
 impl From<NoneError> for Error {
@@ -99,16 +103,14 @@ impl From<drtioaux::Error<!>> for Error {
     }
 }
 
-macro_rules! unexpected {
+impl From<DmaError> for Error {
-    ($($arg:tt)*) => (return Err(Error::Unexpected(format!($($arg)*))));
+    fn from(value: DmaError) -> Error {
+        Error::DmaError(value)
+    }
 }
 
-/* represents data that has to be sent to Master */
+macro_rules! unexpected {
-#[derive(Debug)]
+    ($($arg:tt)*) => (return Err(Error::Unexpected(format!($($arg)*))));
-pub struct Sliceable {
-    it: usize,
-    data: Vec<u8>,
-    destination: u8
 }
 
 /* represents interkernel messages */
@@ -164,44 +166,6 @@ pub struct SubkernelFinished {
     pub source: u8
 }
 
-pub struct SliceMeta {
-    pub destination: u8,
-    pub len: u16,
-    pub status: PayloadStatus
-}
-
-macro_rules! get_slice_fn {
-    ( $name:tt, $size:expr ) => {
-        pub fn $name(&mut self, data_slice: &mut [u8; $size]) -> SliceMeta {
-            let first = self.it == 0;
-            let len = min($size, self.data.len() - self.it);
-            let last = self.it + len == self.data.len();
-            let status = PayloadStatus::from_status(first, last);
-            data_slice[..len].clone_from_slice(&self.data[self.it..self.it+len]);
-            self.it += len;
-    
-            SliceMeta {
-                destination: self.destination,
-                len: len as u16,
-                status: status
-            }
-        }
-    };
-}
-
-impl Sliceable {
-    pub fn new(destination: u8, data: Vec<u8>) -> Sliceable {
-        Sliceable {
-            it: 0,
-            data: data,
-            destination: destination
-        }
-    }
-
-    get_slice_fn!(get_slice_sat, SAT_PAYLOAD_MAX_SIZE);
-    get_slice_fn!(get_slice_master, MASTER_PAYLOAD_MAX_SIZE);
-}
-
 impl MessageManager {
     pub fn new() -> MessageManager {
         MessageManager {
@@ -312,10 +276,8 @@ impl Session {
 
     fn running(&self) -> bool {
         match self.kernel_state {
-            KernelState::Absent  | KernelState::Loaded  => false,
+            KernelState::Absent | KernelState::Loaded  => false,
-            KernelState::Running | KernelState::MsgAwait { .. } |
+            _ => true
-                KernelState::MsgSending | KernelState::SubkernelAwaitLoad |
-                KernelState::SubkernelAwaitFinish { .. } => true
         }
     }
 
@@ -490,7 +452,39 @@ impl Manager {
         }
     }
 
-    pub fn process_kern_requests(&mut self, router: &mut Router, routing_table: &RoutingTable, rank: u8, destination: u8) {
+    pub fn ddma_finished(&mut self, error: u8, channel: u32, timestamp: u64) {
+        if let KernelState::DmaAwait { .. } = self.session.kernel_state {
+            kern_send(&kern::DmaAwaitRemoteReply { 
+                timeout: false, error: error, channel: channel, timestamp: timestamp 
+            }).unwrap();
+            self.session.kernel_state = KernelState::Running;
+        }
+    }
+
+    pub fn ddma_nack(&mut self) {
+        // for simplicity treat it as a timeout for now...
+        if let KernelState::DmaAwait { .. } = self.session.kernel_state {
+            kern_send(&kern::DmaAwaitRemoteReply { 
+                timeout: true, error: 0, channel: 0, timestamp: 0
+            }).unwrap();
+            self.session.kernel_state = KernelState::Running;
+        }
+    }
+
+    pub fn ddma_remote_uploaded(&mut self, succeeded: bool) {
+        if let KernelState::DmaUploading { .. } = self.session.kernel_state {
+            if succeeded {
+                self.session.kernel_state = KernelState::Running;
+                kern_acknowledge().unwrap();
+            } else {
+                self.stop();
+                self.runtime_exception(Error::DmaError(DmaError::UploadFail));
+            }
+            
+        }
+    }
+
+    pub fn process_kern_requests(&mut self, router: &mut Router, routing_table: &RoutingTable, rank: u8, destination: u8, dma_manager: &mut DmaManager) {
         macro_rules! finished {
             ($with_exception:expr) => {{ Some(SubkernelFinished { 
                 source: self.session.source, id: self.current_id, 
@@ -504,6 +498,7 @@ impl Manager {
                 destination: subkernel_finished.source, id: subkernel_finished.id, 
                 with_exception: subkernel_finished.with_exception, exception_src: subkernel_finished.exception_source
             }, &routing_table, rank, destination);
+            dma_manager.cleanup(router, rank, destination, routing_table);
         }
 
         if !self.is_running() {
@@ -528,7 +523,7 @@ impl Manager {
              }
         }
 
-        match self.process_kern_message(router, routing_table, rank, destination) {
+        match self.process_kern_message(router, routing_table, rank, destination, dma_manager) {
             Ok(Some(with_exception)) => {
                 self.last_finished = finished!(with_exception)
             },
@@ -585,6 +580,20 @@ impl Manager {
                 }
                 Ok(())
             }
+            KernelState::DmaAwait { max_time } => {
+                if clock::get_ms() > *max_time {
+                    kern_send(&kern::DmaAwaitRemoteReply { timeout: true, error: 0, channel: 0, timestamp: 0 })?;
+                    self.session.kernel_state = KernelState::Running;
+                }
+                // ddma_finished() and nack() covers the other case
+                Ok(())
+            }
+            KernelState::DmaUploading { max_time } => {
+                if clock::get_ms() > *max_time {
+                    unexpected!("DMAError: Timed out sending traces to remote");
+                }
+                Ok(())
+            }
             _ => Ok(())
         }
     }
@@ -622,13 +631,19 @@ impl Manager {
 
     fn process_kern_message(&mut self, router: &mut Router, 
         routing_table: &RoutingTable,
-        rank: u8, destination: u8
+        rank: u8, destination: u8,
+        dma_manager: &mut DmaManager
     ) -> Result<Option<bool>, Error> {
         // returns Ok(with_exception) on finish
         // None if the kernel is still running
         kern_recv(|request| {
             match (request, &self.session.kernel_state) {
-                (&kern::LoadReply(_), KernelState::Loaded) => {
+                (&kern::LoadReply(_), KernelState::Loaded) |
+                    (_, KernelState::DmaUploading { .. }) |
+                    (_, KernelState::DmaAwait { .. }) |
+                    (_, KernelState::MsgSending) |
+                    (_, KernelState::SubkernelAwaitLoad) | 
+                    (_, KernelState::SubkernelAwaitFinish { .. }) => {
                     // We're standing by; ignore the message.
                     return Ok(None)
                 }
@@ -693,6 +708,50 @@ impl Manager {
                     return Ok(Some(true))
                 }
 
+                &kern::DmaRecordStart(name) => {
+                    dma_manager.record_start(name);
+                    kern_acknowledge()
+                }
+                &kern::DmaRecordAppend(data) => {
+                    dma_manager.record_append(data);
+                    kern_acknowledge()
+                }
+                &kern::DmaRecordStop { duration, enable_ddma: _ } => {
+                    // ddma is always used on satellites
+                    if let Ok(id) = dma_manager.record_stop(duration, destination) {
+                        let remote_count = dma_manager.upload_traces(id, router, rank, destination, routing_table)?;
+                        if remote_count > 0 {
+                            let max_time = clock::get_ms() + 10_000 as u64;
+                            self.session.kernel_state = KernelState::DmaUploading { max_time: max_time };
+                            Ok(())
+                        } else {
+                            kern_acknowledge()
+                        }
+                    } else {
+                        unexpected!("DMAError: found an unsupported call to RTIO devices on master") 
+                    }
+                }
+                &kern::DmaEraseRequest { name } => {
+                    dma_manager.erase_name(name, router, rank, destination, routing_table);
+                    kern_acknowledge()
+                }
+                &kern::DmaRetrieveRequest { name } => {
+                    dma_manager.with_trace(destination, name, |trace, duration| {
+                        kern_send(&kern::DmaRetrieveReply {
+                            trace:    trace,
+                            duration: duration,
+                            uses_ddma: true,
+                        })
+                    })
+                }
+                &kern::DmaStartRemoteRequest { id, timestamp } => {
+                    let max_time = clock::get_ms() + 10_000 as u64;
+                    self.session.kernel_state = KernelState::DmaAwait { max_time: max_time };
+                    dma_manager.playback_remote(id as u32, timestamp as u64, router, rank, destination, routing_table)?;
+                    dma_manager.playback(destination, id as u32, timestamp as u64)?;
+                    Ok(())
+                }
+
                 &kern::SubkernelMsgSend { id: _, destination: msg_dest, count, tag, data } => {
                     let dest = match msg_dest {
                         Some(dest) => dest,
@@ -717,13 +776,13 @@ impl Manager {
                     router.route(drtioaux::Packet::SubkernelLoadRunRequest { 
                         source: destination, destination: sk_destination, id: id, run: run 
                     }, routing_table, rank, destination);
-                    kern_acknowledge()
+                    Ok(())
                 }
 
                 &kern::SubkernelAwaitFinishRequest{ id, timeout } => {
                     let max_time = clock::get_ms() + timeout as u64;
                     self.session.kernel_state = KernelState::SubkernelAwaitFinish { max_time: max_time, id: id };
-                    kern_acknowledge()
+                    Ok(())
                 }
 
                 request => unexpected!("unexpected request {:?} from kernel CPU", request)

artiq/firmware/satman/main.rs

@@ -377,9 +377,14 @@ fn process_aux_packet(dmamgr: &mut DmaManager, analyzer: &mut Analyzer, kernelmg
             *self_destination = destination;
             let succeeded = dmamgr.add(source, id, status, &trace, length as usize).is_ok();
             router.send(drtioaux::Packet::DmaAddTraceReply { 
-                destination: source, succeeded: succeeded 
+                source: *self_destination, destination: source, id: id, succeeded: succeeded 
             }, _routing_table, *rank, *self_destination)
         }
+        drtioaux::Packet::DmaAddTraceReply { source, destination: _destination, id, succeeded } => {
+            forward!(_routing_table, _destination, *rank, _repeaters, &packet);
+            dmamgr.ack_upload(kernelmgr, source, id, succeeded, router, *rank, *self_destination, _routing_table);
+            Ok(())
+        }
         drtioaux::Packet::DmaRemoveTraceRequest { source, destination: _destination, id } => {
             forward!(_routing_table, _destination, *rank, _repeaters, &packet);
             let succeeded = dmamgr.erase(source, id).is_ok();
@@ -395,6 +400,18 @@ fn process_aux_packet(dmamgr: &mut DmaManager, analyzer: &mut Analyzer, kernelmg
                 destination: source, succeeded: succeeded
             }, _routing_table, *rank, *self_destination)
         }
+        drtioaux::Packet::DmaPlaybackReply { destination: _destination, succeeded } => {
+            forward!(_routing_table, _destination, *rank, _repeaters, &packet);
+            if !succeeded {
+                kernelmgr.ddma_nack();
+            }
+            Ok(())
+        }
+        drtioaux::Packet::DmaPlaybackStatus { source: _, destination: _destination, id, error, channel, timestamp } => {
+            forward!(_routing_table, _destination, *rank, _repeaters, &packet);
+            dmamgr.remote_finished(kernelmgr, id, error, channel, timestamp);
+            Ok(())
+        }
 
         drtioaux::Packet::SubkernelAddDataRequest { destination, id, status, length, data } => {
             forward!(_routing_table, destination, *rank, _repeaters, &packet);
@@ -426,7 +443,6 @@ fn process_aux_packet(dmamgr: &mut DmaManager, analyzer: &mut Analyzer, kernelmg
             kernelmgr.subkernel_load_run_reply(succeeded, *self_destination);
             Ok(())
         }
-        // { destination: u8, id: u32, with_exception: bool, exception_src: u8 },
         drtioaux::Packet::SubkernelFinished { destination: _destination, id, with_exception, exception_src } => {
             forward!(_routing_table, _destination, *rank, _repeaters, &packet);
             kernelmgr.remote_subkernel_finished(id, with_exception, exception_src);
@@ -772,7 +788,7 @@ pub extern fn main() -> i32 {
                 }, &routing_table, rank, destination);
             }
 
-            kernelmgr.process_kern_requests(&mut router, &routing_table, rank, destination);
+            kernelmgr.process_kern_requests(&mut router, &routing_table, rank, destination, &mut dma_manager);
 
             if let Some((repno, packet)) = router.get_downstream_packet() {
                 if let Err(e) = repeaters[repno].aux_send(&packet) {

artiq/firmware/satman/routing.rs

@@ -1,6 +1,64 @@
-use alloc::collections::vec_deque::VecDeque;
+use alloc::{vec::Vec, collections::vec_deque::VecDeque};
 use board_artiq::{drtioaux, drtio_routing};
 use board_misoc::csr;
+use core::cmp::min;
+use proto_artiq::drtioaux_proto::PayloadStatus;
+use SAT_PAYLOAD_MAX_SIZE;
+use MASTER_PAYLOAD_MAX_SIZE;
+
+/* represents data that has to be sent with the aux protocol */
+#[derive(Debug)]
+pub struct Sliceable {
+    it: usize,
+    data: Vec<u8>,
+    destination: u8
+}
+
+pub struct SliceMeta {
+    pub destination: u8,
+    pub len: u16,
+    pub status: PayloadStatus
+}
+
+macro_rules! get_slice_fn {
+    ( $name:tt, $size:expr ) => {
+        pub fn $name(&mut self, data_slice: &mut [u8; $size]) -> SliceMeta {
+            let first = self.it == 0;
+            let len = min($size, self.data.len() - self.it);
+            let last = self.it + len == self.data.len();
+            let status = PayloadStatus::from_status(first, last);
+            data_slice[..len].clone_from_slice(&self.data[self.it..self.it+len]);
+            self.it += len;
+    
+            SliceMeta {
+                destination: self.destination,
+                len: len as u16,
+                status: status
+            }
+        }
+    };
+}
+
+impl Sliceable {
+    pub fn new(destination: u8, data: Vec<u8>) -> Sliceable {
+        Sliceable {
+            it: 0,
+            data: data,
+            destination: destination
+        }
+    }
+
+    pub fn at_end(&self) -> bool {
+        self.it == self.data.len()
+    }
+
+    pub fn extend(&mut self, data: &[u8]) {
+        self.data.extend(data);
+    }
+
+    get_slice_fn!(get_slice_sat, SAT_PAYLOAD_MAX_SIZE);
+    get_slice_fn!(get_slice_master, MASTER_PAYLOAD_MAX_SIZE);
+}
 
 // Packets from downstream (further satellites) are received and routed appropriately.
 // they're passed as soon as possible downstream (within the subtree), or sent upstream,