esp.c: consolidate DMA and PDMA logic in MESSAGE OUT phase

This allows the removal of duplicate logic shared between the two implementations.
Note that we restrict esp_raise_drq() to PDMA to help reduce the log verbosity
for normal DMA.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-81-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 49fc059eaa03be4848cc04ebd8608d922fc3071b..ae65c2ef3763ee0e7bd39c3061877137fd0f52e7 100644 (file)
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -436,17 +436,15 @@ static void esp_do_dma(ESPState *s)
         if (s->dma_memory_read) {
             len = MIN(len, fifo8_num_free(&s->cmdfifo));
             s->dma_memory_read(s->dma_opaque, buf, len);
-            fifo8_push_all(&s->cmdfifo, buf, len);
             esp_set_tc(s, esp_get_tc(s) - len);
-            s->cmdfifo_cdb_offset += len;
         } else {
-            n = esp_fifo_pop_buf(&s->fifo, buf, fifo8_num_used(&s->fifo));
-            n = MIN(fifo8_num_free(&s->cmdfifo), n);
-            fifo8_push_all(&s->cmdfifo, buf, n);
-            s->cmdfifo_cdb_offset += n;
+            len = esp_fifo_pop_buf(&s->fifo, buf, fifo8_num_used(&s->fifo));
+            len = MIN(fifo8_num_free(&s->cmdfifo), len);
+            esp_raise_drq(s);
         }
 
-        esp_raise_drq(s);
+        fifo8_push_all(&s->cmdfifo, buf, len);
+        s->cmdfifo_cdb_offset += len;
 
         switch (s->rregs[ESP_CMD]) {
         case CMD_SELATN | CMD_DMA: