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esp: move get_cmd() post-DMA code to get_cmd_cb()

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This will be needed to implement pseudo-DMA

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20191026164546.30020-3-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2019-10-26 18:45:37 +02:00
parent 15407433e8
commit 6130b18850
1 changed files with 29 additions and 17 deletions
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46
hw/scsi/esp.c
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@ -84,6 +84,34 @@ void esp_request_cancelled(SCSIRequest *req)
}
}
static int get_cmd_cb(ESPState *s)
{
int target;
target = s->wregs[ESP_WBUSID] & BUSID_DID;
s->ti_size = 0;
s->ti_rptr = 0;
s->ti_wptr = 0;
if (s->current_req) {
/* Started a new command before the old one finished. Cancel it. */
scsi_req_cancel(s->current_req);
s->async_len = 0;
}
s->current_dev = scsi_device_find(&s->bus, 0, target, 0);
if (!s->current_dev) {
/* No such drive */
s->rregs[ESP_RSTAT] = 0;
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = SEQ_0;
esp_raise_irq(s);
return -1;
}
return 0;
}
static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
{
uint32_t dmalen;
@ -108,23 +136,7 @@ static uint32_t get_cmd(ESPState *s, uint8_t *buf, uint8_t buflen)
}
trace_esp_get_cmd(dmalen, target);
s->ti_size = 0;
s->ti_rptr = 0;
s->ti_wptr = 0;
if (s->current_req) {
/* Started a new command before the old one finished. Cancel it. */
scsi_req_cancel(s->current_req);
s->async_len = 0;
}
s->current_dev = scsi_device_find(&s->bus, 0, target, 0);
if (!s->current_dev) {
// No such drive
s->rregs[ESP_RSTAT] = 0;
s->rregs[ESP_RINTR] = INTR_DC;
s->rregs[ESP_RSEQ] = SEQ_0;
esp_raise_irq(s);
if (get_cmd_cb(s) < 0) {
return 0;
}
return dmalen;