|
 |
96a5f8 |
From f6239f570a57ba6069ce1033b696365bdfed1b47 Mon Sep 17 00:00:00 2001
|
|
|
96a5f8 |
From: Alon Levy <alevy@redhat.com>
|
|
|
96a5f8 |
Date: Tue, 22 Mar 2011 12:28:00 +0200
|
|
|
96a5f8 |
Subject: [PATCH] spice-qemu-char.c: remove intermediate buffer
|
|
|
96a5f8 |
|
|
|
96a5f8 |
BZ: 672191
|
|
|
96a5f8 |
upstream: not submitted (explained below)
|
|
|
96a5f8 |
|
|
|
96a5f8 |
virtio-serial's buffer is valid when it calls us, and we don't
|
|
|
96a5f8 |
access it otherwise: vmc_read is only called in response to wakeup,
|
|
|
96a5f8 |
or else we set datalen=0 and throttle. Then vmc_read is called back,
|
|
|
96a5f8 |
we return 0 (not accessing the buffer) and set the timer to unthrottle.
|
|
|
96a5f8 |
|
|
|
96a5f8 |
Also make datalen int and not ssize_t (to fit spice_chr_write signature).
|
|
|
96a5f8 |
|
|
|
96a5f8 |
This relied on the previous patch that introduces throttling, which
|
|
|
96a5f8 |
can't go upstream right now as explained in that patch.
|
|
|
96a5f8 |
|
|
|
96a5f8 |
Signed-off-by: Cole Robinson <crobinso@redhat.com>
|
|
|
96a5f8 |
---
|
|
|
96a5f8 |
spice-qemu-char.c | 18 ++++++------------
|
|
|
96a5f8 |
1 file changed, 6 insertions(+), 12 deletions(-)
|
|
|
96a5f8 |
|
|
|
96a5f8 |
diff --git a/spice-qemu-char.c b/spice-qemu-char.c
|
|
|
96a5f8 |
index 75bb125..5065240 100644
|
|
|
96a5f8 |
--- a/spice-qemu-char.c
|
|
|
96a5f8 |
+++ b/spice-qemu-char.c
|
|
|
96a5f8 |
@@ -23,9 +23,8 @@ typedef struct SpiceCharDriver {
|
|
|
96a5f8 |
SpiceCharDeviceInstance sin;
|
|
|
96a5f8 |
char *subtype;
|
|
|
96a5f8 |
bool active;
|
|
|
96a5f8 |
- uint8_t *buffer;
|
|
|
96a5f8 |
- uint8_t *datapos;
|
|
|
96a5f8 |
- ssize_t bufsize, datalen;
|
|
|
96a5f8 |
+ const uint8_t *datapos;
|
|
|
96a5f8 |
+ int datalen;
|
|
|
96a5f8 |
uint32_t debug;
|
|
|
96a5f8 |
QEMUTimer *unblock_timer;
|
|
|
96a5f8 |
QLIST_ENTRY(SpiceCharDriver) next;
|
|
|
96a5f8 |
@@ -73,7 +72,7 @@ static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
|
|
|
96a5f8 |
SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
|
|
|
96a5f8 |
int bytes = MIN(len, scd->datalen);
|
|
|
96a5f8 |
|
|
|
96a5f8 |
- dprintf(scd, 2, "%s: %p %d/%d/%zd\n", __func__, scd->datapos, len, bytes, scd->datalen);
|
|
|
96a5f8 |
+ dprintf(scd, 2, "%s: %p %d/%d/%d\n", __func__, scd->datapos, len, bytes, scd->datalen);
|
|
|
96a5f8 |
if (bytes > 0) {
|
|
|
96a5f8 |
memcpy(buf, scd->datapos, bytes);
|
|
|
96a5f8 |
scd->datapos += bytes;
|
|
|
96a5f8 |
@@ -189,18 +188,13 @@ static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
|
|
|
96a5f8 |
dprintf(s, 2, "%s: %d\n", __func__, len);
|
|
|
96a5f8 |
vmc_register_interface(s);
|
|
|
96a5f8 |
assert(s->datalen == 0);
|
|
|
96a5f8 |
- if (s->bufsize < len) {
|
|
|
96a5f8 |
- s->bufsize = len;
|
|
|
96a5f8 |
- s->buffer = g_realloc(s->buffer, s->bufsize);
|
|
|
96a5f8 |
- }
|
|
|
96a5f8 |
- memcpy(s->buffer, buf, len);
|
|
|
96a5f8 |
- s->datapos = s->buffer;
|
|
|
96a5f8 |
+ s->datapos = buf;
|
|
|
96a5f8 |
s->datalen = len;
|
|
|
96a5f8 |
spice_server_char_device_wakeup(&s->sin);
|
|
|
96a5f8 |
read_bytes = len - s->datalen;
|
|
|
96a5f8 |
if (read_bytes != len) {
|
|
|
96a5f8 |
- dprintf(s, 1, "%s: throttling: %d < %d (%zd)\n", __func__,
|
|
|
96a5f8 |
- read_bytes, len, s->bufsize);
|
|
|
96a5f8 |
+ dprintf(s, 1, "%s: throttling: %d < %d\n", __func__,
|
|
|
96a5f8 |
+ read_bytes, len);
|
|
|
96a5f8 |
s->chr->write_blocked = true;
|
|
|
96a5f8 |
/* We'll get passed in the unconsumed data with the next call */
|
|
|
96a5f8 |
s->datalen = 0;
|