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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 24/24] [xen-unstable.hg] remove arbitrary limit in minios on number of event channels it can use
Changes the minios evtchn implementation to use a list instead of an array.
This allows it to grow as necessary to support any number of ports.
Unfortunately, it's still limited by NR_EVS in events.c.
Signed-off-by: Diego Ongaro <diego.ongaro@xxxxxxxxxx>
Signed-off-by: Alex Zeffertt <alex.zeffertt@xxxxxxxxxxxxx>
---
diff -r 62b77e8a4dda extras/mini-os/include/lib.h
--- a/extras/mini-os/include/lib.h Wed Mar 18 17:17:12 2009 +0000
+++ b/extras/mini-os/include/lib.h Wed Mar 18 17:22:52 2009 +0000
@@ -60,6 +60,7 @@
#include <xen/xen.h>
#include <xen/event_channel.h>
#include "gntmap.h"
+#include "list.h"
#ifdef HAVE_LIBC
#include <stdio.h>
@@ -147,7 +148,12 @@
FTYPE_FB,
};
-#define MAX_EVTCHN_PORTS 16
+struct evtchn_port_info {
+ struct minios_list_head list;
+ evtchn_port_t port;
+ unsigned long pending;
+ int bound;
+};
extern struct file {
enum fd_type type;
@@ -162,13 +168,7 @@
off_t offset;
} file;
struct {
- /* To each event channel FD is associated a series of ports which
- * wakes select for this FD. */
- struct {
- evtchn_port_t port;
- unsigned long pending;
- int bound;
- } ports[MAX_EVTCHN_PORTS];
+ struct minios_list_head ports;
} evtchn;
struct gntmap gntmap;
struct {
diff -r 62b77e8a4dda tools/libxc/xc_minios.c
--- a/tools/libxc/xc_minios.c Wed Mar 18 17:17:12 2009 +0000
+++ b/tools/libxc/xc_minios.c Wed Mar 18 17:22:52 2009 +0000
@@ -134,23 +134,41 @@
do_exit();
}
+/* XXX Note: This is not threadsafe */
+static struct evtchn_port_info* port_alloc(int xce_handle) {
+ struct evtchn_port_info *port_info;
+ port_info = malloc(sizeof(struct evtchn_port_info));
+ if (port_info == NULL)
+ return NULL;
+ port_info->pending = 0;
+ port_info->port = -1;
+ port_info->bound = 0;
+
+ minios_list_add(&port_info->list, &files[xce_handle].evtchn.ports);
+ return port_info;
+}
+
+static void port_dealloc(struct evtchn_port_info *port_info) {
+ if (port_info->bound)
+ unbind_evtchn(port_info->port);
+ minios_list_del(&port_info->list);
+ free(port_info);
+}
+
int xc_evtchn_open(void)
{
- int fd = alloc_fd(FTYPE_EVTCHN), i;
- for (i = 0; i < MAX_EVTCHN_PORTS; i++) {
- files[fd].evtchn.ports[i].port = -1;
- files[fd].evtchn.ports[i].bound = 0;
- }
+ int fd = alloc_fd(FTYPE_EVTCHN);
+ MINIOS_INIT_LIST_HEAD(&files[fd].evtchn.ports);
printf("evtchn_open() -> %d\n", fd);
return fd;
}
int xc_evtchn_close(int xce_handle)
{
- int i;
- for (i = 0; i < MAX_EVTCHN_PORTS; i++)
- if (files[xce_handle].evtchn.ports[i].bound)
- unbind_evtchn(files[xce_handle].evtchn.ports[i].port);
+ struct evtchn_port_info *port_info, *tmp;
+ minios_list_for_each_entry_safe(port_info, tmp,
&files[xce_handle].evtchn.ports, list)
+ port_dealloc(port_info);
+
files[xce_handle].type = FTYPE_NONE;
return 0;
}
@@ -173,47 +191,34 @@
return ret;
}
-/* XXX Note: This is not threadsafe */
-static int port_alloc(int xce_handle) {
- int i;
- for (i= 0; i < MAX_EVTCHN_PORTS; i++)
- if (files[xce_handle].evtchn.ports[i].port == -1)
- break;
- if (i == MAX_EVTCHN_PORTS) {
- printf("Too many ports in xc handle\n");
- errno = EMFILE;
- return -1;
- }
- files[xce_handle].evtchn.ports[i].pending = 0;
- return i;
-}
-
static void evtchn_handler(evtchn_port_t port, struct pt_regs *regs, void
*data)
{
int xce_handle = (intptr_t) data;
- int i;
+ struct evtchn_port_info *port_info;
assert(files[xce_handle].type == FTYPE_EVTCHN);
mask_evtchn(port);
- for (i= 0; i < MAX_EVTCHN_PORTS; i++)
- if (files[xce_handle].evtchn.ports[i].port == port)
- break;
- if (i == MAX_EVTCHN_PORTS) {
- printk("Unknown port for handle %d\n", xce_handle);
- return;
+ minios_list_for_each_entry(port_info, &files[xce_handle].evtchn.ports,
list) {
+ if (port_info->port == port)
+ goto found;
}
- files[xce_handle].evtchn.ports[i].pending = 1;
+ printk("Unknown port for handle %d\n", xce_handle);
+ return;
+
+found:
+ port_info->pending = 1;
files[xce_handle].read = 1;
wake_up(&event_queue);
}
evtchn_port_or_error_t xc_evtchn_bind_unbound_port(int xce_handle, int domid)
{
- int ret, i;
+ struct evtchn_port_info *port_info;
+ int ret;
evtchn_port_t port;
assert(get_current() == main_thread);
- i = port_alloc(xce_handle);
- if (i == -1)
+ port_info = port_alloc(xce_handle);
+ if (port_info == NULL)
return -1;
printf("xc_evtchn_bind_unbound_port(%d)", domid);
@@ -221,11 +226,12 @@
printf(" = %d\n", ret);
if (ret < 0) {
+ port_dealloc(port_info);
errno = -ret;
return -1;
}
- files[xce_handle].evtchn.ports[i].bound = 1;
- files[xce_handle].evtchn.ports[i].port = port;
+ port_info->bound = 1;
+ port_info->port = port;
unmask_evtchn(port);
return port;
}
@@ -233,12 +239,13 @@
evtchn_port_or_error_t xc_evtchn_bind_interdomain(int xce_handle, int domid,
evtchn_port_t remote_port)
{
+ struct evtchn_port_info *port_info;
evtchn_port_t local_port;
- int ret, i;
+ int ret;
assert(get_current() == main_thread);
- i = port_alloc(xce_handle);
- if (i == -1)
+ port_info = port_alloc(xce_handle);
+ if (port_info == NULL)
return -1;
printf("xc_evtchn_bind_interdomain(%d, %"PRId32")", domid, remote_port);
@@ -246,70 +253,69 @@
printf(" = %d\n", ret);
if (ret < 0) {
+ port_dealloc(port_info);
errno = -ret;
return -1;
}
- files[xce_handle].evtchn.ports[i].bound = 1;
- files[xce_handle].evtchn.ports[i].port = local_port;
+ port_info->bound = 1;
+ port_info->port = local_port;
unmask_evtchn(local_port);
return local_port;
}
int xc_evtchn_unbind(int xce_handle, evtchn_port_t port)
{
- int i;
- for (i = 0; i < MAX_EVTCHN_PORTS; i++)
- if (files[xce_handle].evtchn.ports[i].port == port) {
- files[xce_handle].evtchn.ports[i].port = -1;
- break;
- }
- if (i == MAX_EVTCHN_PORTS) {
- printf("Warning: couldn't find port %"PRId32" for xc handle %x\n",
port, xce_handle);
- errno = -EINVAL;
- return -1;
+ struct evtchn_port_info *port_info;
+
+ minios_list_for_each_entry(port_info, &files[xce_handle].evtchn.ports,
list) {
+ if (port_info->port == port) {
+ port_dealloc(port_info);
+ return 0;
+ }
}
- files[xce_handle].evtchn.ports[i].bound = 0;
- unbind_evtchn(port);
- return 0;
+ printf("Warning: couldn't find port %"PRId32" for xc handle %x\n", port,
xce_handle);
+ errno = -EINVAL;
+ return -1;
}
evtchn_port_or_error_t xc_evtchn_bind_virq(int xce_handle, unsigned int virq)
{
+ struct evtchn_port_info *port_info;
evtchn_port_t port;
- int i;
assert(get_current() == main_thread);
- i = port_alloc(xce_handle);
- if (i == -1)
+ port_info = port_alloc(xce_handle);
+ if (port_info == NULL)
return -1;
printf("xc_evtchn_bind_virq(%d)", virq);
port = bind_virq(virq, evtchn_handler, (void*)(intptr_t)xce_handle);
if (port < 0) {
+ port_dealloc(port_info);
errno = -port;
return -1;
}
- files[xce_handle].evtchn.ports[i].bound = 1;
- files[xce_handle].evtchn.ports[i].port = port;
+ port_info->bound = 1;
+ port_info->port = port;
unmask_evtchn(port);
return port;
}
evtchn_port_or_error_t xc_evtchn_pending(int xce_handle)
{
- int i;
+ struct evtchn_port_info *port_info;
unsigned long flags;
evtchn_port_t ret = -1;
local_irq_save(flags);
files[xce_handle].read = 0;
- for (i = 0; i < MAX_EVTCHN_PORTS; i++) {
- evtchn_port_t port = files[xce_handle].evtchn.ports[i].port;
- if (port != -1 && files[xce_handle].evtchn.ports[i].pending) {
+
+ minios_list_for_each_entry(port_info, &files[xce_handle].evtchn.ports,
list) {
+ if (port_info->port != -1 && port_info->pending) {
if (ret == -1) {
- ret = port;
- files[xce_handle].evtchn.ports[i].pending = 0;
+ ret = port_info->port;
+ port_info->pending = 0;
} else {
files[xce_handle].read = 1;
break;
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