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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Mini-os cleanup
The patch removes old Xenbus files, fixes 0 length mmu_updates table bug (bugfix by Melvin Anderson) and adds missing console.h header file (again spotted by Melvin). Signed-off-by: Grzegorz Milos <gm281@xxxxxxxxx>Some more applying to do Keir :) (BTW, I can merge the two patches together it it makes your life easier). diff -r c247056431f8 -r c9b0b655c052 extras/mini-os/mm.c
--- a/extras/mini-os/mm.c Thu Mar 23 18:34:50 2006
+++ b/extras/mini-os/mm.c Thu Mar 23 19:13:12 2006
@@ -372,7 +372,7 @@
unsigned long *tab = (unsigned long *)start_info.pt_base;
unsigned long pt_page = (unsigned long)pfn_to_virt(*pt_pfn);
unsigned long prot_e, prot_t, pincmd;
- mmu_update_t mmu_updates[0];
+ mmu_update_t mmu_updates[1];
struct mmuext_op pin_request;
DEBUG("Allocating new L%d pt frame for pt_pfn=%lx, "
diff -r c247056431f8 -r c9b0b655c052 extras/mini-os/include/console.h
--- /dev/null Thu Mar 23 18:34:50 2006
+++ b/extras/mini-os/include/console.h Thu Mar 23 19:13:12 2006
@@ -0,0 +1,49 @@
+/*
+ ****************************************************************************
+ * (C) 2006 - Grzegorz Milos - Cambridge University
+ ****************************************************************************
+ *
+ * File: console.h
+ * Author: Grzegorz Milos
+ * Changes:
+ *
+ * Date: Mar 2006
+ *
+ * Environment: Xen Minimal OS
+ * Description: Console interface.
+ *
+ * Handles console I/O. Defines printk.
+ *
+ ****************************************************************************
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifndef _LIB_CONSOLE_H_
+#define _LIB_CONSOLE_H_
+
+#include<traps.h>
+
+void printk(const char *fmt, ...);
+void xprintk(const char *fmt, ...);
+
+void xencons_rx(char *buf, unsigned len, struct pt_regs *regs);
+void xencons_tx(void);
+
+void init_console(void);
+
+#endif /* _LIB_CONSOLE_H_ */
diff -r c247056431f8 -r c9b0b655c052 extras/mini-os/xenbus/Makefile
--- a/extras/mini-os/xenbus/Makefile Thu Mar 23 18:34:50 2006
+++ /dev/null Thu Mar 23 19:13:12 2006
@@ -1,9 +0,0 @@
-all: xenstore.h xenbus_comms.o xenbus_xs.o xenbus_probe.o
-
-xenstore.h:
- [ -e xenstored.h ] || ln -sf ../../../tools/xenstore/xenstored.h
xenstored.h
-
-clean:
- #Taken care of by main Makefile
- #rm xenstored.h
- #rm *.o
diff -r c247056431f8 -r c9b0b655c052 extras/mini-os/xenbus/xenbus_comms.c
--- a/extras/mini-os/xenbus/xenbus_comms.c Thu Mar 23 18:34:50 2006
+++ /dev/null Thu Mar 23 19:13:12 2006
@@ -1,184 +0,0 @@
-/******************************************************************************
- * xenbus_comms.c
- *
- * Low level code to talks to Xen Store: ringbuffer and event channel.
- *
- * Copyright (C) 2005 Rusty Russell, IBM Corporation
- *
- * This file may be distributed separately from the Linux kernel, or
- * incorporated into other software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-#include <types.h>
-#include <wait.h>
-#include <mm.h>
-#include <hypervisor.h>
-#include <events.h>
-#include <os.h>
-#include <lib.h>
-#include <xenbus.h>
-#include "xenbus_comms.h"
-
-static int xenbus_irq;
-
-extern void xenbus_probe(void *);
-extern int xenstored_ready;
-
-DECLARE_WAIT_QUEUE_HEAD(xb_waitq);
-
-static inline struct xenstore_domain_interface *xenstore_domain_interface(void)
-{
- return mfn_to_virt(start_info.store_mfn);
-}
-
-static void wake_waiting(int port, struct pt_regs *regs)
-{
- wake_up(&xb_waitq);
-}
-
-static int check_indexes(XENSTORE_RING_IDX cons, XENSTORE_RING_IDX prod)
-{
- return ((prod - cons) <= XENSTORE_RING_SIZE);
-}
-
-static void *get_output_chunk(XENSTORE_RING_IDX cons,
- XENSTORE_RING_IDX prod,
- char *buf, uint32_t *len)
-{
- *len = XENSTORE_RING_SIZE - MASK_XENSTORE_IDX(prod);
- if ((XENSTORE_RING_SIZE - (prod - cons)) < *len)
- *len = XENSTORE_RING_SIZE - (prod - cons);
- return buf + MASK_XENSTORE_IDX(prod);
-}
-
-static const void *get_input_chunk(XENSTORE_RING_IDX cons,
- XENSTORE_RING_IDX prod,
- const char *buf, uint32_t *len)
-{
- *len = XENSTORE_RING_SIZE - MASK_XENSTORE_IDX(cons);
- if ((prod - cons) < *len)
- *len = prod - cons;
- return buf + MASK_XENSTORE_IDX(cons);
-}
-
-int xb_write(const void *data, unsigned len)
-{
- struct xenstore_domain_interface *intf = xenstore_domain_interface();
- XENSTORE_RING_IDX cons, prod;
-
- while (len != 0) {
- void *dst;
- unsigned int avail;
-
- wait_event(xb_waitq, (intf->req_prod - intf->req_cons) !=
- XENSTORE_RING_SIZE);
-
- /* Read indexes, then verify. */
- cons = intf->req_cons;
- prod = intf->req_prod;
- mb();
- if (!check_indexes(cons, prod))
- return -EIO;
-
- dst = get_output_chunk(cons, prod, intf->req, &avail);
- if (avail == 0)
- continue;
- if (avail > len)
- avail = len;
-
- memcpy(dst, data, avail);
- data = (void*) ( (unsigned long)data + avail );
- len -= avail;
-
- /* Other side must not see new header until data is there. */
- wmb();
- intf->req_prod += avail;
-
- /* This implies mb() before other side sees interrupt. */
- notify_remote_via_evtchn(start_info.store_evtchn);
- }
-
- return 0;
-}
-
-int xb_read(void *data, unsigned len)
-{
- struct xenstore_domain_interface *intf = xenstore_domain_interface();
- XENSTORE_RING_IDX cons, prod;
-
- while (len != 0) {
- unsigned int avail;
- const char *src;
-
- wait_event(xb_waitq,
- intf->rsp_cons != intf->rsp_prod);
-
- /* Read indexes, then verify. */
- cons = intf->rsp_cons;
- prod = intf->rsp_prod;
- mb();
- if (!check_indexes(cons, prod))
- return -EIO;
-
- src = get_input_chunk(cons, prod, intf->rsp, &avail);
- if (avail == 0)
- continue;
- if (avail > len)
- avail = len;
-
- /* We must read header before we read data. */
- rmb();
-
- memcpy(data, src, avail);
- data = (void*) ( (unsigned long)data + avail );
- len -= avail;
-
- /* Other side must not see free space until we've copied out */
- mb();
- intf->rsp_cons += avail;
-
- printk("Finished read of %i bytes (%i to go)\n", avail, len);
-
- /* Implies mb(): they will see new header. */
- notify_remote_via_evtchn(start_info.store_evtchn);
- }
-
- return 0;
-}
-
-/* Set up interrupt handler off store event channel. */
-int xb_init_comms(void)
-{
- int err;
-
- if (xenbus_irq)
- unbind_evtchn(xenbus_irq);
-
- err = bind_evtchn(
- start_info.store_evtchn, wake_waiting);
- if (err <= 0) {
- printk("XENBUS request irq failed %i\n", err);
- return err;
- }
-
- xenbus_irq = err;
-
- return 0;
-}
diff -r c247056431f8 -r c9b0b655c052 extras/mini-os/xenbus/xenbus_comms.h
--- a/extras/mini-os/xenbus/xenbus_comms.h Thu Mar 23 18:34:50 2006
+++ /dev/null Thu Mar 23 19:13:12 2006
@@ -1,40 +0,0 @@
-/*
- * Private include for xenbus communications.
- *
- * Copyright (C) 2005 Rusty Russell, IBM Corporation
- *
- * This file may be distributed separately from the Linux kernel, or
- * incorporated into other software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#ifndef _XENBUS_COMMS_H
-#define _XENBUS_COMMS_H
-
-int xs_init(void);
-int xb_init_comms(void);
-
-/* Low level routines. */
-int xb_write(const void *data, unsigned len);
-int xb_read(void *data, unsigned len);
-int xs_input_avail(void);
-extern struct wait_queue_head xb_waitq;
-
-#endif /* _XENBUS_COMMS_H */
diff -r c247056431f8 -r c9b0b655c052 extras/mini-os/xenbus/xenbus_xs.c
--- a/extras/mini-os/xenbus/xenbus_xs.c Thu Mar 23 18:34:50 2006
+++ /dev/null Thu Mar 23 19:13:12 2006
@@ -1,796 +0,0 @@
-/******************************************************************************
- * xenbus_xs.c
- *
- * This is the kernel equivalent of the "xs" library. We don't need everything
- * and we use xenbus_comms for communication.
- *
- * Copyright (C) 2005 Rusty Russell, IBM Corporation
- *
- * This file may be distributed separately from the Linux kernel, or
- * incorporated into other software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-#include <errno.h>
-#include <types.h>
-#include <list.h>
-#include <lib.h>
-#include <err.h>
-#include <os.h>
-#include <xmalloc.h>
-#include <fcntl.h>
-#include <xenbus.h>
-#include <wait.h>
-#include <sched.h>
-#include <semaphore.h>
-#include <spinlock.h>
-#include <xen/io/xs_wire.h>
-#include "xenbus_comms.h"
-
-#define streq(a, b) (strcmp((a), (b)) == 0)
-
-struct xs_stored_msg {
- struct list_head list;
-
- struct xsd_sockmsg hdr;
-
- union {
- /* Queued replies. */
- struct {
- char *body;
- } reply;
-
- /* Queued watch events. */
- struct {
- struct xenbus_watch *handle;
- char **vec;
- unsigned int vec_size;
- } watch;
- } u;
-};
-
-struct xs_handle {
- /* A list of replies. Currently only one will ever be outstanding. */
- struct list_head reply_list;
- spinlock_t reply_lock;
- struct wait_queue_head reply_waitq;
-
- /* One request at a time. */
- struct semaphore request_mutex;
-
- /* Protect transactions against save/restore. */
- struct rw_semaphore suspend_mutex;
-};
-
-static struct xs_handle xs_state;
-
-/* List of registered watches, and a lock to protect it. */
-static LIST_HEAD(watches);
-static DEFINE_SPINLOCK(watches_lock);
-
-/* List of pending watch callback events, and a lock to protect it. */
-static LIST_HEAD(watch_events);
-static DEFINE_SPINLOCK(watch_events_lock);
-
-/*
- * Details of the xenwatch callback kernel thread. The thread waits on the
- * watch_events_waitq for work to do (queued on watch_events list). When it
- * wakes up it acquires the xenwatch_mutex before reading the list and
- * carrying out work.
- */
-/* static */ DECLARE_MUTEX(xenwatch_mutex);
-static DECLARE_WAIT_QUEUE_HEAD(watch_events_waitq);
-
-static int get_error(const char *errorstring)
-{
- unsigned int i;
-
- for (i = 0; !streq(errorstring, xsd_errors[i].errstring); i++) {
- if (i == ARRAY_SIZE(xsd_errors) - 1) {
- printk("XENBUS xen store gave: unknown error %s",
- errorstring);
- return EINVAL;
- }
- }
- return xsd_errors[i].errnum;
-}
-
-static void *read_reply(enum xsd_sockmsg_type *type, unsigned int *len)
-{
- struct xs_stored_msg *msg;
- char *body;
-
- spin_lock(&xs_state.reply_lock);
-
- while (list_empty(&xs_state.reply_list)) {
- spin_unlock(&xs_state.reply_lock);
- wait_event(xs_state.reply_waitq,
- !list_empty(&xs_state.reply_list));
- spin_lock(&xs_state.reply_lock);
- }
-
- msg = list_entry(xs_state.reply_list.next,
- struct xs_stored_msg, list);
- list_del(&msg->list);
-
- spin_unlock(&xs_state.reply_lock);
-
- *type = msg->hdr.type;
- if (len)
- *len = msg->hdr.len;
- body = msg->u.reply.body;
-
- free(msg);
-
- return body;
-}
-
-/* Emergency write. */
-void xenbus_debug_write(const char *str, unsigned int count)
-{
- struct xsd_sockmsg msg = { 0 };
-
- msg.type = XS_DEBUG;
- msg.len = sizeof("print") + count + 1;
-
- down(&xs_state.request_mutex);
- xb_write(&msg, sizeof(msg));
- xb_write("print", sizeof("print"));
- xb_write(str, count);
- xb_write("", 1);
- up(&xs_state.request_mutex);
-}
-
-void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg)
-{
- void *ret;
- struct xsd_sockmsg req_msg = *msg;
- int err;
-
- if (req_msg.type == XS_TRANSACTION_START)
- down_read(&xs_state.suspend_mutex);
-
- down(&xs_state.request_mutex);
-
- err = xb_write(msg, sizeof(*msg) + msg->len);
- if (err) {
- msg->type = XS_ERROR;
- ret = ERR_PTR(err);
- } else {
- ret = read_reply(&msg->type, &msg->len);
- }
-
- up(&xs_state.request_mutex);
-
- if ((msg->type == XS_TRANSACTION_END) ||
- ((req_msg.type == XS_TRANSACTION_START) &&
- (msg->type == XS_ERROR)))
- up_read(&xs_state.suspend_mutex);
-
- return ret;
-}
-
-/* Send message to xs, get kmalloc'ed reply. ERR_PTR() on error. */
-static void *xs_talkv(struct xenbus_transaction *t,
- enum xsd_sockmsg_type type,
- const struct kvec *iovec,
- unsigned int num_vecs,
- unsigned int *len)
-{
- struct xsd_sockmsg msg;
- void *ret = NULL;
- unsigned int i;
- int err;
-
- msg.tx_id = (u32)(unsigned long)t;
- msg.req_id = 0;
- msg.type = type;
- msg.len = 0;
- for (i = 0; i < num_vecs; i++)
- msg.len += iovec[i].iov_len;
-
- down(&xs_state.request_mutex);
-
- err = xb_write(&msg, sizeof(msg));
- if (err) {
- up(&xs_state.request_mutex);
- return ERR_PTR(err);
- }
-
- for (i = 0; i < num_vecs; i++) {
- err = xb_write(iovec[i].iov_base, iovec[i].iov_len);;
- if (err) {
- up(&xs_state.request_mutex);
- return ERR_PTR(err);
- }
- }
-
- ret = read_reply(&msg.type, len);
-
- up(&xs_state.request_mutex);
-
- if (IS_ERR(ret))
- return ret;
-
- if (msg.type == XS_ERROR) {
- err = get_error(ret);
- free(ret);
- return ERR_PTR(-err);
- }
-
- // BUG_ON(msg.type != type);
- return ret;
-}
-
-/* Simplified version of xs_talkv: single message. */
-static void *xs_single(struct xenbus_transaction *t,
- enum xsd_sockmsg_type type,
- const char *string,
- unsigned int *len)
-{
- struct kvec iovec;
-
- iovec.iov_base = (void *)string;
- iovec.iov_len = strlen(string) + 1;
- return xs_talkv(t, type, &iovec, 1, len);
-}
-
-/* Many commands only need an ack, don't care what it says. */
-static int xs_error(char *reply)
-{
- if (IS_ERR(reply))
- return PTR_ERR(reply);
- free(reply);
- return 0;
-}
-
-static unsigned int count_strings(const char *strings, unsigned int len)
-{
- unsigned int num;
- const char *p;
-
- for (p = strings, num = 0; p < strings + len; p += strlen(p) + 1)
- num++;
-
- return num;
-}
-
-/* Return the path to dir with /name appended. Buffer must be kfree()'ed. */
-static char *join(const char *dir, const char *name)
-{
- char *buffer;
-
- buffer = malloc(strlen(dir) + strlen("/") + strlen(name) + 1);
- if (buffer == NULL)
- return ERR_PTR(-ENOMEM);
-
- strcpy(buffer, dir);
- if (!streq(name, "")) {
- strcat(buffer, "/");
- strcat(buffer, name);
- }
-
- return buffer;
-}
-
-static char **split(char *strings, unsigned int len, unsigned int *num)
-{
- char *p, **ret;
-
- /* Count the strings. */
- *num = count_strings(strings, len);
-
- /* Transfer to one big alloc for easy freeing. */
- ret = malloc(*num * sizeof(char *) + len);
- if (!ret) {
- free(strings);
- return ERR_PTR(-ENOMEM);
- }
- memcpy(&ret[*num], strings, len);
- free(strings);
-
- strings = (char *)&ret[*num];
- for (p = strings, *num = 0; p < strings + len; p += strlen(p) + 1)
- ret[(*num)++] = p;
-
- return ret;
-}
-
-char **xenbus_directory(struct xenbus_transaction *t,
- const char *dir, const char *node, unsigned int *num)
-{
- char *strings, *path;
- unsigned int len;
-
- path = join(dir, node);
- if (IS_ERR(path))
- return (char **)path;
-
- strings = xs_single(t, XS_DIRECTORY, path, &len);
- free(path);
- if (IS_ERR(strings))
- return (char **)strings;
-
- return split(strings, len, num);
-}
-
-/* Check if a path exists. Return 1 if it does. */
-int xenbus_exists(struct xenbus_transaction *t,
- const char *dir, const char *node)
-{
- char **d;
- int dir_n;
-
- d = xenbus_directory(t, dir, node, &dir_n);
- if (IS_ERR(d))
- return 0;
- free(d);
- return 1;
-}
-
-/* Get the value of a single file.
- * Returns a kmalloced value: call free() on it after use.
- * len indicates length in bytes.
- */
-void *xenbus_read(struct xenbus_transaction *t,
- const char *dir, const char *node, unsigned int *len)
-{
- char *path;
- void *ret;
-
- path = join(dir, node);
- if (IS_ERR(path))
- return (void *)path;
-
- ret = xs_single(t, XS_READ, path, len);
- free(path);
- return ret;
-}
-
-/* Write the value of a single file.
- * Returns -err on failure.
- */
-int xenbus_write(struct xenbus_transaction *t,
- const char *dir, const char *node, const char *string)
-{
- const char *path;
- struct kvec iovec[2];
- int ret;
-
- path = join(dir, node);
- if (IS_ERR(path))
- return PTR_ERR(path);
-
- iovec[0].iov_base = (void *)path;
- iovec[0].iov_len = strlen(path) + 1;
- iovec[1].iov_base = (void *)string;
- iovec[1].iov_len = strlen(string);
-
- ret = xs_error(xs_talkv(t, XS_WRITE, iovec, ARRAY_SIZE(iovec), NULL));
- free(path);
- return ret;
-}
-
-/* Create a new directory. */
-int xenbus_mkdir(struct xenbus_transaction *t,
- const char *dir, const char *node)
-{
- char *path;
- int ret;
-
- path = join(dir, node);
- if (IS_ERR(path))
- return PTR_ERR(path);
-
- ret = xs_error(xs_single(t, XS_MKDIR, path, NULL));
- free(path);
- return ret;
-}
-
-/* Destroy a file or directory (directories must be empty). */
-int xenbus_rm(struct xenbus_transaction *t, const char *dir, const char *node)
-{
- char *path;
- int ret;
-
- path = join(dir, node);
- if (IS_ERR(path))
- return PTR_ERR(path);
-
- ret = xs_error(xs_single(t, XS_RM, path, NULL));
- free(path);
- return ret;
-}
-
-/* Start a transaction: changes by others will not be seen during this
- * transaction, and changes will not be visible to others until end.
- */
-struct xenbus_transaction *xenbus_transaction_start(void)
-{
- char *id_str;
- unsigned long id;
-
- down_read(&xs_state.suspend_mutex);
-
- id_str = xs_single(NULL, XS_TRANSACTION_START, "", NULL);
- if (IS_ERR(id_str)) {
- up_read(&xs_state.suspend_mutex);
- return (struct xenbus_transaction *)id_str;
- }
-
- id = simple_strtoul(id_str, NULL, 0);
- free(id_str);
-
- return (struct xenbus_transaction *)id;
-}
-
-/* End a transaction.
- * If abandon is true, transaction is discarded instead of committed.
- */
-int xenbus_transaction_end(struct xenbus_transaction *t, int abort)
-{
- char abortstr[2];
- int err;
-
- if (abort)
- strcpy(abortstr, "F");
- else
- strcpy(abortstr, "T");
-
- err = xs_error(xs_single(t, XS_TRANSACTION_END, abortstr, NULL));
-
- up_read(&xs_state.suspend_mutex);
-
- return err;
-}
-
-/* Single read and scanf: returns -errno or num scanned. */
-int xenbus_scanf(struct xenbus_transaction *t,
- const char *dir, const char *node, const char *fmt, ...)
-{
- va_list ap;
- int ret;
- char *val;
-
- val = xenbus_read(t, dir, node, NULL);
- if (IS_ERR(val))
- return PTR_ERR(val);
-
- va_start(ap, fmt);
- ret = vsscanf(val, fmt, ap);
- va_end(ap);
- free(val);
- /* Distinctive errno. */
- if (ret == 0)
- return -ERANGE;
- return ret;
-}
-
-/* Single printf and write: returns -errno or 0. */
-int xenbus_printf(struct xenbus_transaction *t,
- const char *dir, const char *node, const char *fmt, ...)
-{
- va_list ap;
- int ret;
-#define PRINTF_BUFFER_SIZE 4096
- char *printf_buffer;
-
- printf_buffer = malloc(PRINTF_BUFFER_SIZE);
- if (printf_buffer == NULL)
- return -ENOMEM;
-
- va_start(ap, fmt);
- ret = vsnprintf(printf_buffer, PRINTF_BUFFER_SIZE, fmt, ap);
- va_end(ap);
-
- // BUG_ON(ret > PRINTF_BUFFER_SIZE-1);
- ret = xenbus_write(t, dir, node, printf_buffer);
-
- free(printf_buffer);
-
- return ret;
-}
-
-/* Takes tuples of names, scanf-style args, and void **, NULL terminated. */
-int xenbus_gather(struct xenbus_transaction *t, const char *dir, ...)
-{
- va_list ap;
- const char *name;
- int ret = 0;
-
- va_start(ap, dir);
- while (ret == 0 && (name = va_arg(ap, char *)) != NULL) {
- const char *fmt = va_arg(ap, char *);
- void *result = va_arg(ap, void *);
- char *p;
-
- p = xenbus_read(t, dir, name, NULL);
- if (IS_ERR(p)) {
- ret = PTR_ERR(p);
- break;
- }
- if (fmt) {
- if (sscanf(p, fmt, result) == 0)
- ret = -EINVAL;
- free(p);
- } else
- *(char **)result = p;
- }
- va_end(ap);
- return ret;
-}
-
-static int xs_watch(const char *path, const char *token)
-{
- struct kvec iov[2];
-
- iov[0].iov_base = (void *)path;
- iov[0].iov_len = strlen(path) + 1;
- iov[1].iov_base = (void *)token;
- iov[1].iov_len = strlen(token) + 1;
-
- return xs_error(xs_talkv(NULL, XS_WATCH, iov,
- ARRAY_SIZE(iov), NULL));
-}
-
-static int xs_unwatch(const char *path, const char *token)
-{
- struct kvec iov[2];
-
- iov[0].iov_base = (char *)path;
- iov[0].iov_len = strlen(path) + 1;
- iov[1].iov_base = (char *)token;
- iov[1].iov_len = strlen(token) + 1;
-
- return xs_error(xs_talkv(NULL, XS_UNWATCH, iov,
- ARRAY_SIZE(iov), NULL));
-}
-
-static struct xenbus_watch *find_watch(const char *token)
-{
- struct xenbus_watch *i, *cmp;
-
- cmp = (void *)simple_strtoul(token, NULL, 16);
-
- list_for_each_entry(i, &watches, list)
- if (i == cmp)
- return i;
-
- return NULL;
-}
-
-/* Register callback to watch this node. */
-int register_xenbus_watch(struct xenbus_watch *watch)
-{
- /* Pointer in ascii is the token. */
- char token[sizeof(watch) * 2 + 1];
- int err;
-
- sprintf(token, "%lX", (long)watch);
-
- down_read(&xs_state.suspend_mutex);
-
- spin_lock(&watches_lock);
- // BUG_ON(find_watch(token));
- list_add(&watch->list, &watches);
- spin_unlock(&watches_lock);
-
- err = xs_watch(watch->node, token);
-
- /* Ignore errors due to multiple registration. */
- if ((err != 0) && (err != -EEXIST)) {
- spin_lock(&watches_lock);
- list_del(&watch->list);
- spin_unlock(&watches_lock);
- }
-
- up_read(&xs_state.suspend_mutex);
-
- return err;
-}
-
-void unregister_xenbus_watch(struct xenbus_watch *watch)
-{
- struct xs_stored_msg *msg, *tmp;
- char token[sizeof(watch) * 2 + 1];
- int err;
-
- sprintf(token, "%lX", (long)watch);
-
- down_read(&xs_state.suspend_mutex);
-
- spin_lock(&watches_lock);
- // BUG_ON(!find_watch(token));
- list_del(&watch->list);
- spin_unlock(&watches_lock);
-
- err = xs_unwatch(watch->node, token);
- if (err)
- printk("XENBUS Failed to release watch %s: %i\n",
- watch->node, err);
-
- up_read(&xs_state.suspend_mutex);
-
- /* Cancel pending watch events. */
- spin_lock(&watch_events_lock);
- list_for_each_entry_safe(msg, tmp, &watch_events, list) {
- if (msg->u.watch.handle != watch)
- continue;
- list_del(&msg->list);
- free(msg->u.watch.vec);
- free(msg);
- }
- spin_unlock(&watch_events_lock);
-}
-
-void xs_suspend(void)
-{
- down_write(&xs_state.suspend_mutex);
- down(&xs_state.request_mutex);
-}
-
-void xs_resume(void)
-{
- struct xenbus_watch *watch;
- char token[sizeof(watch) * 2 + 1];
-
- up(&xs_state.request_mutex);
-
- /* No need for watches_lock: the suspend_mutex is sufficient. */
- list_for_each_entry(watch, &watches, list) {
- sprintf(token, "%lX", (long)watch);
- xs_watch(watch->node, token);
- }
-
- up_write(&xs_state.suspend_mutex);
-}
-
-static void xenwatch_thread(void *unused)
-{
- struct list_head *ent;
- struct xs_stored_msg *msg;
-
- for (;;) {
- wait_event(watch_events_waitq,
- !list_empty(&watch_events));
-
- down(&xenwatch_mutex);
-
- spin_lock(&watch_events_lock);
- ent = watch_events.next;
- if (ent != &watch_events)
- list_del(ent);
- spin_unlock(&watch_events_lock);
-
- if (ent != &watch_events) {
- msg = list_entry(ent, struct xs_stored_msg, list);
- msg->u.watch.handle->callback(
- msg->u.watch.handle,
- (const char **)msg->u.watch.vec,
- msg->u.watch.vec_size);
- free(msg->u.watch.vec);
- free(msg);
- }
-
- up(&xenwatch_mutex);
- }
-}
-
-static int process_msg(void)
-{
- struct xs_stored_msg *msg;
- char *body;
- int err;
-
- msg = malloc(sizeof(*msg));
- if (msg == NULL)
- return -ENOMEM;
-
- err = xb_read(&msg->hdr, sizeof(msg->hdr));
- if (err) {
- free(msg);
- return err;
- }
-
- body = malloc(msg->hdr.len + 1);
- if (body == NULL) {
- free(msg);
- return -ENOMEM;
- }
-
- err = xb_read(body, msg->hdr.len);
- if (err) {
- free(body);
- free(msg);
- return err;
- }
- body[msg->hdr.len] = '\0';
-
- if (msg->hdr.type == XS_WATCH_EVENT) {
- msg->u.watch.vec = split(body, msg->hdr.len,
- &msg->u.watch.vec_size);
- if (IS_ERR(msg->u.watch.vec)) {
- free(msg);
- return PTR_ERR(msg->u.watch.vec);
- }
-
- spin_lock(&watches_lock);
- msg->u.watch.handle = find_watch(
- msg->u.watch.vec[XS_WATCH_TOKEN]);
- if (msg->u.watch.handle != NULL) {
- spin_lock(&watch_events_lock);
- list_add_tail(&msg->list, &watch_events);
- wake_up(&watch_events_waitq);
- spin_unlock(&watch_events_lock);
- } else {
- free(msg->u.watch.vec);
- free(msg);
- }
- spin_unlock(&watches_lock);
- } else {
- msg->u.reply.body = body;
- spin_lock(&xs_state.reply_lock);
- list_add_tail(&msg->list, &xs_state.reply_list);
- spin_unlock(&xs_state.reply_lock);
- wake_up(&xs_state.reply_waitq);
- }
-
- return 0;
-}
-
-static void xenbus_thread(void *unused)
-{
- int err;
-
- for (;;) {
- err = process_msg();
- if (err)
- printk("XENBUS error %d while reading "
- "message\n", err);
- }
-}
-
-int xs_init(void)
-{
- int err;
- struct thread *kxwatcher_thread;
- struct thread *kxenbus_thread;
-
- INIT_LIST_HEAD(&xs_state.reply_list);
- spin_lock_init(&xs_state.reply_lock);
- init_waitqueue_head(&xs_state.reply_waitq);
-
- init_MUTEX(&xs_state.request_mutex);
- init_rwsem(&xs_state.suspend_mutex);
-
- /* Initialize the shared memory rings to talk to xenstored */
- err = xb_init_comms();
- if (err)
- return err;
-
- kxwatcher_thread = create_thread("kxwatch", xenwatch_thread, NULL);
- if (IS_ERR(kxwatcher_thread))
- return PTR_ERR(kxwatcher_thread);
-
- kxenbus_thread = create_thread("kxenbus", xenbus_thread, NULL);
- if (IS_ERR(kxenbus_thread))
- return PTR_ERR(kxenbus_thread);
-
- return 0;
-}
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