From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
To: peter.maydell@linaro.org, qemu-devel@nongnu.org
Subject: [PULL 03/13] esp: rework write_response() to avoid using the FIFO for DMA transactions
Date: Mon, 12 Apr 2021 23:20:38 +0100 [thread overview]
Message-ID: <20210412222048.22818-4-mark.cave-ayland@ilande.co.uk> (raw)
In-Reply-To: <20210412222048.22818-1-mark.cave-ayland@ilande.co.uk>
The code for write_response() has always used the FIFO to store the data for
the status/message in phases, even for DMA transactions. Switch to using a
separate buffer that can be used directly for DMA transactions and restrict
the FIFO use to the non-DMA case.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210407195801.685-3-mark.cave-ayland@ilande.co.uk>
---
hw/scsi/esp.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index a79196f3f3..2584ec6fb1 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -445,18 +445,16 @@ static void write_response_pdma_cb(ESPState *s)
static void write_response(ESPState *s)
{
- uint32_t n;
+ uint8_t buf[2];
trace_esp_write_response(s->status);
- fifo8_reset(&s->fifo);
- esp_fifo_push(s, s->status);
- esp_fifo_push(s, 0);
+ buf[0] = s->status;
+ buf[1] = 0;
if (s->dma) {
if (s->dma_memory_write) {
- s->dma_memory_write(s->dma_opaque,
- (uint8_t *)fifo8_pop_buf(&s->fifo, 2, &n), 2);
+ s->dma_memory_write(s->dma_opaque, buf, 2);
s->rregs[ESP_RSTAT] = STAT_TC | STAT_ST;
s->rregs[ESP_RINTR] |= INTR_BS | INTR_FC;
s->rregs[ESP_RSEQ] = SEQ_CD;
@@ -466,7 +464,8 @@ static void write_response(ESPState *s)
return;
}
} else {
- s->ti_size = 2;
+ fifo8_reset(&s->fifo);
+ fifo8_push_all(&s->fifo, buf, 2);
s->rregs[ESP_RFLAGS] = 2;
}
esp_raise_irq(s);
--
2.20.1
next prev parent reply other threads:[~2021-04-12 22:24 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 22:20 [PULL 00/13] qemu-sparc queue 20210412 Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 01/13] esp: fix setting of ESPState mig_version_id when launching QEMU with -S option Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 02/13] esp: always check current_req is not NULL before use in DMA callbacks Mark Cave-Ayland
2021-04-12 22:20 ` Mark Cave-Ayland [this message]
2021-04-12 22:20 ` [PULL 04/13] esp: consolidate esp_cmdfifo_push() into esp_fifo_push() Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 05/13] esp: consolidate esp_cmdfifo_pop() into esp_fifo_pop() Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 06/13] esp: introduce esp_fifo_pop_buf() and use it instead of fifo8_pop_buf() Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 07/13] esp: ensure cmdfifo is not empty and current_dev is non-NULL Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 08/13] esp: don't underflow cmdfifo in do_cmd() Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 09/13] esp: don't overflow cmdfifo in get_cmd() Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 10/13] esp: don't overflow cmdfifo if TC is larger than the cmdfifo size Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 11/13] esp: don't reset async_len directly in esp_select() if cancelling request Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 12/13] esp: ensure that do_cmd is set to zero before submitting an ESP select command Mark Cave-Ayland
2021-04-12 22:20 ` [PULL 13/13] tests/qtest: add tests for am53c974 device Mark Cave-Ayland
2021-04-13 12:04 ` [PULL 00/13] qemu-sparc queue 20210412 Peter Maydell
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