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esp.c: consolidate DMA and PDMA logic in DATA IN 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: <20240112125420.514425-80-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-01-12 12:54:11 +00:00
parent 0d17ce8212
commit c37cc88e9c
1 changed files with 20 additions and 37 deletions
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57
hw/scsi/esp.c
View File

@ -557,51 +557,34 @@ static void esp_do_dma(ESPState *s)
if (len > s->async_len) {
len = s->async_len;
}
if (s->dma_memory_write) {
s->dma_memory_write(s->dma_opaque, s->async_buf, len);
esp_set_tc(s, esp_get_tc(s) - len);
s->async_buf += len;
s->async_len -= len;
s->ti_size -= len;
if (s->async_len == 0 && s->ti_size == 0 && esp_get_tc(s)) {
/* If the guest underflows TC then terminate SCSI request */
scsi_req_continue(s->current_req);
return;
}
if (s->async_len == 0 && fifo8_num_used(&s->fifo) < 2) {
/* Defer until the scsi layer has completed */
scsi_req_continue(s->current_req);
return;
}
esp_dma_ti_check(s);
} else {
/* Copy device data to FIFO */
len = MIN(len, fifo8_num_free(&s->fifo));
fifo8_push_all(&s->fifo, s->async_buf, len);
s->async_buf += len;
s->async_len -= len;
s->ti_size -= len;
esp_set_tc(s, esp_get_tc(s) - len);
esp_raise_drq(s);
if (s->async_len == 0 && s->ti_size == 0 && esp_get_tc(s)) {
/* If the guest underflows TC then terminate SCSI request */
scsi_req_continue(s->current_req);
return;
}
if (s->async_len == 0 && fifo8_num_used(&s->fifo) < 2) {
/* Defer until the scsi layer has completed */
scsi_req_continue(s->current_req);
return;
}
esp_dma_ti_check(s);
}
s->async_buf += len;
s->async_len -= len;
s->ti_size -= len;
esp_set_tc(s, esp_get_tc(s) - len);
if (s->async_len == 0 && s->ti_size == 0 && esp_get_tc(s)) {
/* If the guest underflows TC then terminate SCSI request */
scsi_req_continue(s->current_req);
return;
}
if (s->async_len == 0 && fifo8_num_used(&s->fifo) < 2) {
/* Defer until the scsi layer has completed */
scsi_req_continue(s->current_req);
return;
}
esp_dma_ti_check(s);
break;
case STAT_ST: