From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
To: qemu-devel@nongnu.org, pbonzini@redhat.com, fam@euphon.net,
laurent@vivier.eu
Subject: [PATCH v3 36/42] esp: add maxlen parameter to get_cmd()
Date: Thu, 4 Mar 2021 22:10:57 +0000 [thread overview]
Message-ID: <20210304221103.6369-37-mark.cave-ayland@ilande.co.uk> (raw)
In-Reply-To: <20210304221103.6369-1-mark.cave-ayland@ilande.co.uk>
Some guests use a mixture of DMA and non-DMA transfers in combination with the
SATN and stop command to transfer message out phase and command phase bytes to
the target. Prepare for the next commit by adding a maxlen parameter to
get_cmd() to allow partial transfers.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
hw/scsi/esp.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 4ac299651f..23fcaa90c1 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -194,7 +194,7 @@ static int esp_select(ESPState *s)
return 0;
}
-static uint32_t get_cmd(ESPState *s)
+static uint32_t get_cmd(ESPState *s, uint32_t maxlen)
{
uint8_t *buf = s->cmdbuf;
uint32_t dmalen;
@@ -202,8 +202,8 @@ static uint32_t get_cmd(ESPState *s)
target = s->wregs[ESP_WBUSID] & BUSID_DID;
if (s->dma) {
- dmalen = esp_get_tc(s);
- if (dmalen > ESP_CMDBUF_SZ) {
+ dmalen = MIN(esp_get_tc(s), maxlen);
+ if (dmalen == 0) {
return 0;
}
if (s->dma_memory_read) {
@@ -216,12 +216,14 @@ static uint32_t get_cmd(ESPState *s)
return 0;
}
} else {
- dmalen = s->ti_size;
- if (dmalen > TI_BUFSZ) {
+ dmalen = MIN(s->ti_size, maxlen);
+ if (dmalen == 0) {
return 0;
}
memcpy(buf, s->ti_buf, dmalen);
- buf[0] = buf[2] >> 5;
+ if (dmalen >= 3) {
+ buf[0] = buf[2] >> 5;
+ }
}
trace_esp_get_cmd(dmalen, target);
@@ -290,7 +292,7 @@ static void handle_satn(ESPState *s)
return;
}
s->pdma_cb = satn_pdma_cb;
- cmdlen = get_cmd(s);
+ cmdlen = get_cmd(s, ESP_CMDBUF_SZ);
if (cmdlen > 0) {
s->cmdlen = cmdlen;
do_cmd(s);
@@ -320,7 +322,7 @@ static void handle_s_without_atn(ESPState *s)
return;
}
s->pdma_cb = s_without_satn_pdma_cb;
- cmdlen = get_cmd(s);
+ cmdlen = get_cmd(s, ESP_CMDBUF_SZ);
if (cmdlen > 0) {
s->cmdlen = cmdlen;
do_busid_cmd(s, s->cmdbuf, 0);
@@ -355,7 +357,7 @@ static void handle_satn_stop(ESPState *s)
return;
}
s->pdma_cb = satn_stop_pdma_cb;
- cmdlen = get_cmd(s);
+ cmdlen = get_cmd(s, ESP_CMDBUF_SZ);
if (cmdlen > 0) {
trace_esp_handle_satn_stop(s->cmdlen);
s->cmdlen = cmdlen;
--
2.20.1
next prev parent reply other threads:[~2021-03-04 22:31 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 22:10 [PATCH v3 00/42] esp: consolidate PDMA transfer buffers and other fixes Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 01/42] esp: checkpatch fixes Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 02/42] esp: rename existing ESP QOM type to SYSBUS_ESP Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 03/42] esp: QOMify the internal ESP device state Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 04/42] esp: add vmstate_esp version to embedded ESPState Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 05/42] esp: add trace event when receiving a TI command Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 06/42] esp: fix esp_reg_read() trace event Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 07/42] esp: add PDMA trace events Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 08/42] esp: determine transfer direction directly from SCSI phase Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 09/42] esp: introduce esp_get_tc() and esp_set_tc() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 10/42] esp: introduce esp_get_stc() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 11/42] esp: apply transfer length adjustment when STC is zero at TC load time Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 12/42] esp: remove dma_counter from ESPState Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 13/42] esp: remove dma_left " Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 14/42] esp: remove minlen restriction in handle_ti Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 15/42] esp: introduce esp_pdma_read() and esp_pdma_write() functions Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 16/42] esp: use pdma_origin directly in esp_pdma_read()/esp_pdma_write() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 17/42] esp: move pdma_len and TC logic into esp_pdma_read()/esp_pdma_write() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 18/42] esp: accumulate SCSI commands for PDMA transfers in cmdbuf instead of pdma_buf Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 19/42] esp: remove buf parameter from do_cmd() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 20/42] esp: remove the buf and buflen parameters from get_cmd() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 21/42] esp: remove redundant pdma_start from ESPState Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 22/42] esp: move PDMA length adjustments into esp_pdma_read()/esp_pdma_write() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 23/42] esp: use ti_wptr/ti_rptr to manage the current FIFO position for PDMA Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 24/42] esp: use in-built TC to determine PDMA transfer length Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 25/42] esp: remove CMD pdma_origin Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 26/42] esp: rename get_cmd_cb() to esp_select() Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 27/42] esp: fix PDMA target selection Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 28/42] esp: use FIFO for PDMA transfers between initiator and device Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 29/42] esp: remove pdma_origin from ESPState Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 30/42] esp: add 4 byte PDMA read and write transfers Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 31/42] esp: implement FIFO flush command Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 32/42] esp: latch individual bits in ESP_RINTR register Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 33/42] esp: defer command completion interrupt on incoming data transfers Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 34/42] esp: remove old deferred command completion mechanism Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 35/42] esp: raise interrupt after every non-DMA byte transferred to the FIFO Mark Cave-Ayland
2021-03-04 22:10 ` Mark Cave-Ayland [this message]
2021-03-04 22:10 ` [PATCH v3 37/42] esp: transition to message out phase after SATN and stop command Mark Cave-Ayland
2021-03-04 22:10 ` [PATCH v3 38/42] esp: convert ti_buf from array to Fifo8 Mark Cave-Ayland
2021-03-04 22:11 ` [PATCH v3 39/42] esp: convert cmdbuf " Mark Cave-Ayland
2021-03-04 22:11 ` [PATCH v3 40/42] esp: add trivial implementation of the ESP_RFLAGS register Mark Cave-Ayland
2021-03-04 22:11 ` [PATCH v3 41/42] esp: implement non-DMA transfers in PDMA mode Mark Cave-Ayland
2021-03-04 22:11 ` [PATCH v3 42/42] esp: add support for unaligned accesses Mark Cave-Ayland
2021-03-04 22:58 ` [PATCH v3 00/42] esp: consolidate PDMA transfer buffers and other fixes Philippe Mathieu-Daudé
2021-03-05 7:31 ` Mark Cave-Ayland
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