@@ -89,25 +89,30 @@ struct buffer {
size_t max_capacity;
};
-struct domain {
- int domid;
+struct console {
int master_fd;
int master_pollfd_idx;
int slave_fd;
int log_fd;
- bool is_dead;
- unsigned last_seen;
struct buffer buffer;
- struct domain *next;
char *conspath;
int ring_ref;
xenevtchn_port_or_error_t local_port;
xenevtchn_port_or_error_t remote_port;
+ struct xencons_interface *interface;
+ struct domain *d;
+};
+
+struct domain {
+ int domid;
+ bool is_dead;
+ unsigned last_seen;
+ struct domain *next;
xenevtchn_handle *xce_handle;
int xce_pollfd_idx;
- struct xencons_interface *interface;
int event_count;
long long next_period;
+ struct console console;
};
static struct domain *dom_head;
@@ -160,9 +165,10 @@ static int write_with_timestamp(int fd, const char *data, size_t sz,
static void buffer_append(struct domain *dom)
{
- struct buffer *buffer = &dom->buffer;
+ struct console *con = &dom->console;
+ struct buffer *buffer = &con->buffer;
XENCONS_RING_IDX cons, prod, size;
- struct xencons_interface *intf = dom->interface;
+ struct xencons_interface *intf = con->interface;
cons = intf->out_cons;
prod = intf->out_prod;
@@ -187,22 +193,22 @@ static void buffer_append(struct domain *dom)
xen_mb();
intf->out_cons = cons;
- xenevtchn_notify(dom->xce_handle, dom->local_port);
+ xenevtchn_notify(dom->xce_handle, con->local_port);
/* Get the data to the logfile as early as possible because if
* no one is listening on the console pty then it will fill up
* and handle_tty_write will stop being called.
*/
- if (dom->log_fd != -1) {
+ if (con->log_fd != -1) {
int logret;
if (log_time_guest) {
logret = write_with_timestamp(
- dom->log_fd,
+ con->log_fd,
buffer->data + buffer->size - size,
size, &log_time_guest_needts);
} else {
logret = write_all(
- dom->log_fd,
+ con->log_fd,
buffer->data + buffer->size - size,
size);
}
@@ -338,14 +344,16 @@ static int create_domain_log(struct domain *dom)
static void domain_close_tty(struct domain *dom)
{
- if (dom->master_fd != -1) {
- close(dom->master_fd);
- dom->master_fd = -1;
+ struct console *con = &dom->console;
+
+ if (con->master_fd != -1) {
+ close(con->master_fd);
+ con->master_fd = -1;
}
- if (dom->slave_fd != -1) {
- close(dom->slave_fd);
- dom->slave_fd = -1;
+ if (con->slave_fd != -1) {
+ close(con->slave_fd);
+ con->slave_fd = -1;
}
}
@@ -418,11 +426,12 @@ static int domain_create_tty(struct domain *dom)
char *data;
unsigned int len;
struct termios term;
+ struct console *con = &dom->console;
- assert(dom->slave_fd == -1);
- assert(dom->master_fd == -1);
+ assert(con->slave_fd == -1);
+ assert(con->master_fd == -1);
- if (openpty(&dom->master_fd, &dom->slave_fd, NULL, NULL, NULL) < 0) {
+ if (openpty(&con->master_fd, &con->slave_fd, NULL, NULL, NULL) < 0) {
err = errno;
dolog(LOG_ERR, "Failed to create tty for domain-%d "
"(errno = %i, %s)",
@@ -430,7 +439,7 @@ static int domain_create_tty(struct domain *dom)
return 0;
}
- if (tcgetattr(dom->slave_fd, &term) < 0) {
+ if (tcgetattr(con->slave_fd, &term) < 0) {
err = errno;
dolog(LOG_ERR, "Failed to get tty attributes for domain-%d "
"(errno = %i, %s)",
@@ -438,7 +447,7 @@ static int domain_create_tty(struct domain *dom)
goto out;
}
cfmakeraw(&term);
- if (tcsetattr(dom->slave_fd, TCSANOW, &term) < 0) {
+ if (tcsetattr(con->slave_fd, TCSANOW, &term) < 0) {
err = errno;
dolog(LOG_ERR, "Failed to set tty attributes for domain-%d "
"(errno = %i, %s)",
@@ -446,7 +455,7 @@ static int domain_create_tty(struct domain *dom)
goto out;
}
- if ((slave = ptsname(dom->master_fd)) == NULL) {
+ if ((slave = ptsname(con->master_fd)) == NULL) {
err = errno;
dolog(LOG_ERR, "Failed to get slave name for domain-%d "
"(errno = %i, %s)",
@@ -454,18 +463,18 @@ static int domain_create_tty(struct domain *dom)
goto out;
}
- success = asprintf(&path, "%s/limit", dom->conspath) !=
+ success = asprintf(&path, "%s/limit", con->conspath) !=
-1;
if (!success)
goto out;
data = xs_read(xs, XBT_NULL, path, &len);
if (data) {
- dom->buffer.max_capacity = strtoul(data, 0, 0);
+ con->buffer.max_capacity = strtoul(data, 0, 0);
free(data);
}
free(path);
- success = (asprintf(&path, "%s/tty", dom->conspath) != -1);
+ success = (asprintf(&path, "%s/tty", con->conspath) != -1);
if (!success)
goto out;
success = xs_write(xs, XBT_NULL, path, slave, strlen(slave));
@@ -473,7 +482,7 @@ static int domain_create_tty(struct domain *dom)
if (!success)
goto out;
- if (fcntl(dom->master_fd, F_SETFL, O_NONBLOCK) == -1)
+ if (fcntl(con->master_fd, F_SETFL, O_NONBLOCK) == -1)
goto out;
return 1;
@@ -519,29 +528,32 @@ static int xs_gather(struct xs_handle *xs, const char *dir, ...)
static void domain_unmap_interface(struct domain *dom)
{
- if (dom->interface == NULL)
+ struct console *con = &dom->console;
+
+ if (con->interface == NULL)
return;
- if (xgt_handle && dom->ring_ref == -1)
- xengnttab_unmap(xgt_handle, dom->interface, 1);
+ if (xgt_handle && con->ring_ref == -1)
+ xengnttab_unmap(xgt_handle, con->interface, 1);
else
- munmap(dom->interface, XC_PAGE_SIZE);
- dom->interface = NULL;
- dom->ring_ref = -1;
+ munmap(con->interface, XC_PAGE_SIZE);
+ con->interface = NULL;
+ con->ring_ref = -1;
}
static int domain_create_ring(struct domain *dom)
{
int err, remote_port, ring_ref, rc;
char *type, path[PATH_MAX];
+ struct console *con = &dom->console;
- err = xs_gather(xs, dom->conspath,
+ err = xs_gather(xs, con->conspath,
"ring-ref", "%u", &ring_ref,
"port", "%i", &remote_port,
NULL);
if (err)
goto out;
- snprintf(path, sizeof(path), "%s/type", dom->conspath);
+ snprintf(path, sizeof(path), "%s/type", con->conspath);
type = xs_read(xs, XBT_NULL, path, NULL);
if (type && strcmp(type, "xenconsoled") != 0) {
free(type);
@@ -550,41 +562,41 @@ static int domain_create_ring(struct domain *dom)
free(type);
/* If using ring_ref and it has changed, remap */
- if (ring_ref != dom->ring_ref && dom->ring_ref != -1)
+ if (ring_ref != con->ring_ref && con->ring_ref != -1)
domain_unmap_interface(dom);
- if (!dom->interface && xgt_handle) {
+ if (!con->interface && xgt_handle) {
/* Prefer using grant table */
- dom->interface = xengnttab_map_grant_ref(xgt_handle,
+ con->interface = xengnttab_map_grant_ref(xgt_handle,
dom->domid, GNTTAB_RESERVED_CONSOLE,
PROT_READ|PROT_WRITE);
- dom->ring_ref = -1;
+ con->ring_ref = -1;
}
- if (!dom->interface) {
+ if (!con->interface) {
/* Fall back to xc_map_foreign_range */
- dom->interface = xc_map_foreign_range(
+ con->interface = xc_map_foreign_range(
xc, dom->domid, XC_PAGE_SIZE,
PROT_READ|PROT_WRITE,
(unsigned long)ring_ref);
- if (dom->interface == NULL) {
+ if (con->interface == NULL) {
err = EINVAL;
goto out;
}
- dom->ring_ref = ring_ref;
+ con->ring_ref = ring_ref;
}
/* Go no further if port has not changed and we are still bound. */
- if (remote_port == dom->remote_port) {
+ if (remote_port == con->remote_port) {
xc_evtchn_status_t status = {
.dom = DOMID_SELF,
- .port = dom->local_port };
+ .port = con->local_port };
if ((xc_evtchn_status(xc, &status) == 0) &&
(status.status == EVTCHNSTAT_interdomain))
goto out;
}
- dom->local_port = -1;
- dom->remote_port = -1;
+ con->local_port = -1;
+ con->remote_port = -1;
if (dom->xce_handle != NULL)
xenevtchn_close(dom->xce_handle);
@@ -605,22 +617,22 @@ static int domain_create_ring(struct domain *dom)
dom->xce_handle = NULL;
goto out;
}
- dom->local_port = rc;
- dom->remote_port = remote_port;
+ con->local_port = rc;
+ con->remote_port = remote_port;
- if (dom->master_fd == -1) {
+ if (con->master_fd == -1) {
if (!domain_create_tty(dom)) {
err = errno;
xenevtchn_close(dom->xce_handle);
dom->xce_handle = NULL;
- dom->local_port = -1;
- dom->remote_port = -1;
+ con->local_port = -1;
+ con->remote_port = -1;
goto out;
}
}
- if (log_guest && (dom->log_fd == -1))
- dom->log_fd = create_domain_log(dom);
+ if (log_guest && (con->log_fd == -1))
+ con->log_fd = create_domain_log(dom);
out:
return err;
@@ -630,16 +642,17 @@ static bool watch_domain(struct domain *dom, bool watch)
{
char domid_str[3 + MAX_STRLEN(dom->domid)];
bool success;
+ struct console *con = &dom->console;
snprintf(domid_str, sizeof(domid_str), "dom%u", dom->domid);
if (watch) {
- success = xs_watch(xs, dom->conspath, domid_str);
+ success = xs_watch(xs, con->conspath, domid_str);
if (success)
domain_create_ring(dom);
else
- xs_unwatch(xs, dom->conspath, domid_str);
+ xs_unwatch(xs, con->conspath, domid_str);
} else {
- success = xs_unwatch(xs, dom->conspath, domid_str);
+ success = xs_unwatch(xs, con->conspath, domid_str);
}
return success;
@@ -651,6 +664,7 @@ static struct domain *create_domain(int domid)
struct domain *dom;
char *s;
struct timespec ts;
+ struct console *con;
if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
dolog(LOG_ERR, "Cannot get time of day %s:%s:L%d",
@@ -667,25 +681,26 @@ static struct domain *create_domain(int domid)
dom->domid = domid;
- dom->conspath = xs_get_domain_path(xs, dom->domid);
- s = realloc(dom->conspath, strlen(dom->conspath) +
+ con = &dom->console;
+ con->conspath = xs_get_domain_path(xs, dom->domid);
+ s = realloc(con->conspath, strlen(con->conspath) +
strlen("/console") + 1);
if (s == NULL)
goto out;
- dom->conspath = s;
- strcat(dom->conspath, "/console");
+ con->conspath = s;
+ strcat(con->conspath, "/console");
- dom->master_fd = -1;
- dom->master_pollfd_idx = -1;
- dom->slave_fd = -1;
- dom->log_fd = -1;
+ con->master_fd = -1;
+ con->master_pollfd_idx = -1;
+ con->slave_fd = -1;
+ con->log_fd = -1;
dom->xce_pollfd_idx = -1;
dom->next_period = ((long long)ts.tv_sec * 1000) + (ts.tv_nsec / 1000000) + RATE_LIMIT_PERIOD;
- dom->ring_ref = -1;
- dom->local_port = -1;
- dom->remote_port = -1;
+ con->ring_ref = -1;
+ con->local_port = -1;
+ con->remote_port = -1;
if (!watch_domain(dom, true))
goto out;
@@ -697,7 +712,7 @@ static struct domain *create_domain(int domid)
return dom;
out:
- free(dom->conspath);
+ free(con->conspath);
free(dom);
return NULL;
}
@@ -729,18 +744,20 @@ static void remove_domain(struct domain *dom)
static void cleanup_domain(struct domain *d)
{
+ struct console *con = &d->console;
+
domain_close_tty(d);
- if (d->log_fd != -1) {
- close(d->log_fd);
- d->log_fd = -1;
+ if (con->log_fd != -1) {
+ close(con->log_fd);
+ con->log_fd = -1;
}
- free(d->buffer.data);
- d->buffer.data = NULL;
+ free(con->buffer.data);
+ con->buffer.data = NULL;
- free(d->conspath);
- d->conspath = NULL;
+ free(con->conspath);
+ con->conspath = NULL;
remove_domain(d);
}
@@ -782,7 +799,8 @@ static void enum_domains(void)
static int ring_free_bytes(struct domain *dom)
{
- struct xencons_interface *intf = dom->interface;
+ struct console *con = &dom->console;
+ struct xencons_interface *intf = con->interface;
XENCONS_RING_IDX cons, prod, space;
cons = intf->in_cons;
@@ -812,7 +830,8 @@ static void handle_tty_read(struct domain *dom)
ssize_t len = 0;
char msg[80];
int i;
- struct xencons_interface *intf = dom->interface;
+ struct console *con = &dom->console;
+ struct xencons_interface *intf = con->interface;
XENCONS_RING_IDX prod;
if (dom->is_dead)
@@ -825,7 +844,7 @@ static void handle_tty_read(struct domain *dom)
if (len > sizeof(msg))
len = sizeof(msg);
- len = read(dom->master_fd, msg, len);
+ len = read(con->master_fd, msg, len);
/*
* Note: on Solaris, len == 0 means the slave closed, and this
* is no problem, but Linux can't handle this usefully, so we
@@ -841,7 +860,7 @@ static void handle_tty_read(struct domain *dom)
}
xen_wmb();
intf->in_prod = prod;
- xenevtchn_notify(dom->xce_handle, dom->local_port);
+ xenevtchn_notify(dom->xce_handle, con->local_port);
} else {
domain_close_tty(dom);
shutdown_domain(dom);
@@ -851,18 +870,19 @@ static void handle_tty_read(struct domain *dom)
static void handle_tty_write(struct domain *dom)
{
ssize_t len;
+ struct console *con = &dom->console;
if (dom->is_dead)
return;
- len = write(dom->master_fd, dom->buffer.data + dom->buffer.consumed,
- dom->buffer.size - dom->buffer.consumed);
+ len = write(con->master_fd, con->buffer.data + con->buffer.consumed,
+ con->buffer.size - con->buffer.consumed);
if (len < 1) {
dolog(LOG_DEBUG, "Write failed on domain %d: %zd, %d\n",
dom->domid, len, errno);
domain_handle_broken_tty(dom, domain_is_valid(dom->domid));
} else {
- buffer_advance(&dom->buffer, len);
+ buffer_advance(&con->buffer, len);
}
}
@@ -948,9 +968,11 @@ static void handle_log_reload(void)
if (log_guest) {
struct domain *d;
for (d = dom_head; d; d = d->next) {
- if (d->log_fd != -1)
- close(d->log_fd);
- d->log_fd = create_domain_log(d);
+ struct console *con = &d->console;
+
+ if (con->log_fd != -1)
+ close(con->log_fd);
+ con->log_fd = create_domain_log(d);
}
}
@@ -1059,6 +1081,8 @@ void handle_io(void)
/* Re-calculate any event counter allowances & unblock
domains with new allowance */
for (d = dom_head; d; d = d->next) {
+ struct console *con = &d->console;
+
/* CS 16257:955ee4fa1345 introduces a 5ms fuzz
* for select(), it is not clear poll() has
* similar behavior (returning a couple of ms
@@ -1068,13 +1092,15 @@ void handle_io(void)
if ((now+5) > d->next_period) {
d->next_period = now + RATE_LIMIT_PERIOD;
if (d->event_count >= RATE_LIMIT_ALLOWANCE) {
- (void)xenevtchn_unmask(d->xce_handle, d->local_port);
+ (void)xenevtchn_unmask(d->xce_handle, con->local_port);
}
d->event_count = 0;
}
}
for (d = dom_head; d; d = d->next) {
+ struct console *con = &d->console;
+
if (d->event_count >= RATE_LIMIT_ALLOWANCE) {
/* Determine if we're going to be the next time slice to expire */
if (!next_timeout ||
@@ -1082,25 +1108,25 @@ void handle_io(void)
next_timeout = d->next_period;
} else if (d->xce_handle != NULL) {
if (discard_overflowed_data ||
- !d->buffer.max_capacity ||
- d->buffer.size < d->buffer.max_capacity) {
+ !con->buffer.max_capacity ||
+ con->buffer.size < con->buffer.max_capacity) {
int evtchn_fd = xenevtchn_fd(d->xce_handle);
d->xce_pollfd_idx = set_fds(evtchn_fd,
POLLIN|POLLPRI);
}
}
- if (d->master_fd != -1) {
+ if (con->master_fd != -1) {
short events = 0;
if (!d->is_dead && ring_free_bytes(d))
events |= POLLIN;
- if (!buffer_empty(&d->buffer))
+ if (!buffer_empty(&con->buffer))
events |= POLLOUT;
if (events)
- d->master_pollfd_idx =
- set_fds(d->master_fd,
+ con->master_pollfd_idx =
+ set_fds(con->master_fd,
events|POLLPRI);
}
}
@@ -1159,6 +1185,8 @@ void handle_io(void)
}
for (d = dom_head; d; d = n) {
+ struct console *con = &d->console;
+
n = d->next;
if (d->event_count < RATE_LIMIT_ALLOWANCE) {
if (d->xce_handle != NULL &&
@@ -1170,22 +1198,22 @@ void handle_io(void)
handle_ring_read(d);
}
- if (d->master_fd != -1 && d->master_pollfd_idx != -1) {
- if (fds[d->master_pollfd_idx].revents &
+ if (con->master_fd != -1 && con->master_pollfd_idx != -1) {
+ if (fds[con->master_pollfd_idx].revents &
~(POLLIN|POLLOUT|POLLPRI))
domain_handle_broken_tty(d,
domain_is_valid(d->domid));
else {
- if (fds[d->master_pollfd_idx].revents &
+ if (fds[con->master_pollfd_idx].revents &
POLLIN)
handle_tty_read(d);
- if (fds[d->master_pollfd_idx].revents &
+ if (fds[con->master_pollfd_idx].revents &
POLLOUT)
handle_tty_write(d);
}
}
- d->xce_pollfd_idx = d->master_pollfd_idx = -1;
+ d->xce_pollfd_idx = con->master_pollfd_idx = -1;
if (d->last_seen != enum_pass)
shutdown_domain(d);
Xenconsole uses a domain structure which contains console specific fields. This patch defines a new console structure, which would be used by the xenconsole functions to perform console specific operations like reading/writing data from/to the console ring buffer or reading/writing data from/to console tty. This patch is in preparation to support multiple consoles to support vuart console. Signed-off-by: Bhupinder Thakur <bhupinder.thakur@linaro.org> --- Changes since v3: - The changes in xenconsole have been split into four patches. This is the first patch which modifies the xenconsole to use a new console structure. Changes since v2: - Defined a new function console_create_ring() which sets up the ring buffer and event channel a new console. domain_create_ring() uses this function to setup a console. - This patch does not contain vuart specific changes, which would be introduced in the next patch. - Changes for keeping the PV log file name unchanged. Changes since v1: - Split the domain struture to a separate console structure - Modified the functions to operate on the console struture - Replaced repetitive per console code with generic code tools/console/daemon/io.c | 226 ++++++++++++++++++++++++++-------------------- 1 file changed, 127 insertions(+), 99 deletions(-)