#include <linux/errno.h>
#include <linux/percpu.h>
#include <linux/sched.h>
+#include <linux/uaccess.h>
+
#include <interfaces/vmm_stream.h>
-#include "palacios-stream.h"
+#include "linux-exts.h"
+#include "palacios-ringbuffer.h"
+#include "palacios-vm.h"
+
+#define STREAM_BUF_SIZE 1024
+#define STREAM_NAME_LEN 128
+
+
static struct list_head global_streams;
+struct stream_buffer {
+ char name[STREAM_NAME_LEN];
+ struct ringbuf * buf;
+
+ wait_queue_head_t intr_queue;
+ spinlock_t lock;
+
+ struct v3_guest * guest;
+ struct list_head stream_node;
+};
+
+
+// Currently just the list of open streams
+struct vm_stream_state {
+ struct list_head open_streams;
+};
+
static int stream_enqueue(struct stream_buffer * stream, char * buf, int len) {
int bytes = 0;
}
-int stream_dequeue(struct stream_buffer * stream, char * buf, int len) {
+static int stream_dequeue(struct stream_buffer * stream, char * buf, int len) {
int bytes = 0;
bytes = ringbuf_read(stream->buf, buf, len);
return bytes;
}
-int stream_datalen(struct stream_buffer * stream){
+static int stream_datalen(struct stream_buffer * stream){
return ringbuf_data_len(stream->buf);
}
-int open_stream(const char * name) {
- return -1;
-}
-struct stream_buffer * find_stream_by_name(struct v3_guest * guest, const char * name) {
+static struct stream_buffer * find_stream_by_name(struct v3_guest * guest, const char * name) {
struct stream_buffer * stream = NULL;
struct list_head * stream_list = NULL;
+ struct vm_stream_state * vm_state = NULL;
+
if (guest == NULL) {
stream_list = &global_streams;
} else {
- stream_list = &(guest->streams);
+ vm_state = get_vm_ext_data(guest, "STREAM_INTERFACE");
+
+ if (vm_state == NULL) {
+ printk("ERROR: Could not locate vm stream state for extension STREAM_INTERFACE\n");
+ return NULL;
+ }
+
+ stream_list = &(vm_state->open_streams);
}
list_for_each_entry(stream, stream_list, stream_node) {
static void * palacios_stream_open(const char * name, void * private_data) {
struct v3_guest * guest = (struct v3_guest *)private_data;
struct stream_buffer * stream = NULL;
+ struct vm_stream_state * vm_state = NULL;
+
+ if (guest != NULL) {
+ vm_state = get_vm_ext_data(guest, "STREAM_INTERFACE");
+
+ if (vm_state == NULL) {
+ printk("ERROR: Could not locate vm stream state for extension STREAM_INTERFACE\n");
+ return NULL;
+ }
+ }
if (find_stream_by_name(guest, name) != NULL) {
printk("Stream already exists\n");
if (guest == NULL) {
list_add(&(stream->stream_node), &(global_streams));
} else {
- list_add(&(stream->stream_node), &(guest->streams));
+ list_add(&(stream->stream_node), &(vm_state->open_streams));
}
return stream;
}
-struct v3_stream_hooks palacios_stream_hooks = {
+static struct v3_stream_hooks palacios_stream_hooks = {
.open = palacios_stream_open,
.write = palacios_stream_write,
.close = palacios_stream_close,
};
-void palacios_init_stream() {
+static int stream_init( void ) {
INIT_LIST_HEAD(&(global_streams));
V3_Init_Stream(&palacios_stream_hooks);
+
+ return 0;
}
-void palacios_deinit_stream() {
+static int stream_deinit( void ) {
if (!list_empty(&(global_streams))) {
printk("Error removing module with open streams\n");
}
+
+ return 0;
}
+
+static int stream_connect(struct v3_guest * guest, unsigned int cmd, unsigned long arg, void * priv_data) {
+ void __user * argp = (void __user *)arg;
+ char path_name[STREAM_NAME_LEN];
+
+ if (copy_from_user(path_name, argp, STREAM_NAME_LEN)) {
+ printk("%s(%d): copy from user error...\n", __FILE__, __LINE__);
+ return -EFAULT;
+ }
+
+ printk("ERROR: Opening Streams is currently not implemented...\n");
+
+ return -EFAULT;
+}
+
+
+static int guest_stream_init(struct v3_guest * guest, void ** vm_data) {
+ struct vm_stream_state * state = kmalloc(sizeof(struct vm_stream_state), GFP_KERNEL);
+
+ INIT_LIST_HEAD(&(state->open_streams));
+ *vm_data = state;
+
+
+ add_guest_ctrl(guest, V3_VM_STREAM_CONNECT, stream_connect, state);
+
+ return 0;
+}
+
+
+static int guest_stream_deinit(struct v3_guest * guest, void * vm_data) {
+ struct vm_stream_state * state = vm_data;
+ if (!list_empty(&(state->open_streams))) {
+ printk("Error shutting down VM with open streams\n");
+ }
+
+ return 0;
+}
+
+
+
+static struct linux_ext stream_ext = {
+ .name = "STREAM_INTERFACE",
+ .init = stream_init,
+ .deinit = stream_deinit,
+ .guest_init = guest_stream_init,
+ .guest_deinit = guest_stream_deinit
+};
+
+
+register_extension(&stream_ext);
