[Qemu-devel] [PATCH 18/22] PPC: dbdma: Move processing to io

[Alexander Graf <agraf@suse.de>]

Soon we will introduce intermediate processing pauses which will
allow the bottom half to restart a DMA request that couldn't be
fulfilled yet.

For that to work, move the processing variable into the io struct
which is what DMA providers work with.

While touching it, also change it into a bool

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 hw/misc/macio/mac_dbdma.c  | 10 ++++++----
 include/hw/ppc/mac_dbdma.h |  3 ++-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/hw/misc/macio/mac_dbdma.c b/hw/misc/macio/mac_dbdma.c
index 4ca0491..f47a736 100644
--- a/hw/misc/macio/mac_dbdma.c
+++ b/hw/misc/macio/mac_dbdma.c
@@ -275,7 +275,9 @@ static void dbdma_end(DBDMA_io *io)
     conditional_branch(ch);
 
 wait:
-    ch->processing = 0;
+    /* Indicate that we're ready for a new DMA round */
+    ch->io.processing = false;
+
     if ((ch->regs[DBDMA_STATUS] & RUN) &&
         (ch->regs[DBDMA_STATUS] & ACTIVE))
         channel_run(ch);
@@ -301,7 +303,7 @@ static void start_output(DBDMA_channel *ch, int key, uint32_t addr,
     ch->io.is_last = is_last;
     ch->io.dma_end = dbdma_end;
     ch->io.is_dma_out = 1;
-    ch->processing = 1;
+    ch->io.processing = true;
     if (ch->rw) {
         ch->rw(&ch->io);
     }
@@ -327,7 +329,7 @@ static void start_input(DBDMA_channel *ch, int key, uint32_t addr,
     ch->io.is_last = is_last;
     ch->io.dma_end = dbdma_end;
     ch->io.is_dma_out = 0;
-    ch->processing = 1;
+    ch->io.processing = true;
     if (ch->rw) {
         ch->rw(&ch->io);
     }
@@ -525,7 +527,7 @@ static void DBDMA_run(DBDMAState *s)
     for (channel = 0; channel < DBDMA_CHANNELS; channel++) {
         DBDMA_channel *ch = &s->channels[channel];
         uint32_t status = ch->regs[DBDMA_STATUS];
-        if (!ch->processing && (status & RUN) && (status & ACTIVE)) {
+        if (!ch->io.processing && (status & RUN) && (status & ACTIVE)) {
             channel_run(ch);
         }
     }
diff --git a/include/hw/ppc/mac_dbdma.h b/include/hw/ppc/mac_dbdma.h
index eb8e0f0..4d7318d 100644
--- a/include/hw/ppc/mac_dbdma.h
+++ b/include/hw/ppc/mac_dbdma.h
@@ -37,6 +37,8 @@ struct DBDMA_io {
     int is_last;
     int is_dma_out;
     DBDMA_end dma_end;
+    /* DMA is in progress, don't start another one */
+    bool processing;
 };
 
 /*
@@ -148,7 +150,6 @@ typedef struct DBDMA_channel {
     DBDMA_rw rw;
     DBDMA_flush flush;
     dbdma_cmd current;
-    int processing;
 } DBDMA_channel;
 
 typedef struct {
-- 
1.8.1.4