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Subject[PATCH] [43/48] Suspend2 2.1.9.8 for 2.6.12: 619-userspace-nofreeze.patch
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diff -ruNp 620-userui-header.patch-old/include/linux/netlink.h 620-userui-header.patch-new/include/linux/netlink.h
--- 620-userui-header.patch-old/include/linux/netlink.h 2005-06-20 11:47:29.000000000 +1000
+++ 620-userui-header.patch-new/include/linux/netlink.h 2005-07-04 23:14:19.000000000 +1000
@@ -14,6 +14,7 @@
#define NETLINK_SELINUX 7 /* SELinux event notifications */
#define NETLINK_ARPD 8
#define NETLINK_AUDIT 9 /* auditing */
+#define NETLINK_SUSPEND2_USERUI 10 /* For suspend2's userui */
#define NETLINK_ROUTE6 11 /* af_inet6 route comm channel */
#define NETLINK_IP6_FW 13
#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
diff -ruNp 620-userui-header.patch-old/kernel/power/suspend2_core/ui.c 620-userui-header.patch-new/kernel/power/suspend2_core/ui.c
--- 620-userui-header.patch-old/kernel/power/suspend2_core/ui.c 1970-01-01 10:00:00.000000000 +1000
+++ 620-userui-header.patch-new/kernel/power/suspend2_core/ui.c 2005-07-05 23:48:59.000000000 +1000
@@ -0,0 +1,1186 @@
+/*
+ * kernel/power/ui.c
+ *
+ * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
+ * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
+ * Copyright (C) 2002-2005 Nigel Cunningham <nigel@suspend2.net>
+ *
+ * This file is released under the GPLv2.
+ *
+ * Routines for Software Suspend's user interface.
+ *
+ * The user interface code talks to a userspace program via a
+ * netlink socket.
+ *
+ * The kernel side:
+ * - starts the userui program;
+ * - sends text messages and progress bar status;
+ *
+ * The user space side:
+ * - passes messages regarding user requests (abort, toggle reboot etc)
+ *
+ */
+#define SUSPEND_CONSOLE_C
+
+#define __KERNEL_SYSCALLS__
+
+#include <linux/suspend.h>
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/tty.h>
+#include <linux/vt_kern.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/kmod.h>
+#include <linux/netlink.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <net/sock.h>
+
+#include "proc.h"
+#include "plugins.h"
+#include "suspend.h"
+#include "suspend2_common.h"
+#include "ui.h"
+#include "version.h"
+#include "userui.h"
+
+#include "../power.h"
+
+static struct suspend_plugin_ops userui_ops;
+static int orig_loglevel;
+static int orig_default_message_loglevel;
+static int orig_kmsg;
+
+static char local_printf_buf[1024]; /* Same as printk - should be safe */
+static char lastheader[512];
+static int lastheader_message_len = 0;
+
+#define NUM_USERUI_SKBS 16 /* Number of preallocated skbs for emergencies */
+
+static char userui_program[256] = "";
+
+/* Number of distinct progress amounts that userspace can display */
+static int progress_granularity = 50;
+
+static struct sock *userui_nl;
+static u32 userui_sock_seq;
+static struct sk_buff *userui_skbs[NUM_USERUI_SKBS];
+static int next_free_userui_skb;
+static pid_t userui_pid = -1;
+
+DECLARE_WAIT_QUEUE_HEAD(userui_wait_for_process);
+DECLARE_WAIT_QUEUE_HEAD(userui_wait_for_key);
+
+void s2_userui_message(unsigned long section, unsigned long level,
+ int normally_logged,
+ const char *fmt, va_list args);
+unsigned long userui_update_progress(unsigned long value, unsigned long maximum,
+ const char *fmt, va_list args);
+void userui_prepare_console(void);
+void userui_cleanup_console(void);
+
+/*
+ * Refill our pool of SKBs for use in emergencies (eg, when eating memory and none
+ * can be allocated).
+ */
+static void userui_replenish_skbs(void)
+{
+ while (next_free_userui_skb+1 < NUM_USERUI_SKBS) {
+ userui_skbs[next_free_userui_skb+1] =
+ alloc_skb(NLMSG_SPACE(sizeof(struct userui_msg_params)), GFP_ATOMIC);
+ if (userui_skbs[next_free_userui_skb+1])
+ next_free_userui_skb++;
+ else
+ break;
+ }
+}
+
+/*
+ * Return a single skbuff either from our pool, or try to allocate one if
+ * the pool is exhausted.
+ */
+static struct sk_buff * userui_get_skb(void)
+{
+ struct sk_buff *skb;
+ if (next_free_userui_skb == -1)
+ skb = alloc_skb(NLMSG_SPACE(sizeof(struct userui_msg_params)), GFP_ATOMIC);
+ else {
+ skb = userui_skbs[next_free_userui_skb];
+ userui_skbs[next_free_userui_skb] = NULL;
+ next_free_userui_skb--;
+ }
+
+ userui_replenish_skbs();
+
+ return skb;
+}
+
+static void userui_notify_userspace(void* data)
+{
+ struct task_struct *t;
+ read_lock(&tasklist_lock);
+ if ((t = find_task_by_pid(userui_pid)))
+ wake_up_process(t);
+ read_unlock(&tasklist_lock);
+}
+
+DECLARE_WORK(userui_notify_userspace_work, userui_notify_userspace, NULL);
+
+static void userui_send_message(int type, void* params, size_t len)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ void *dest;
+
+ skb = userui_get_skb();
+ if (!skb) {
+ printk("suspend_userui: Can't allocate skb!\n");
+ return;
+ }
+
+ /* NLMSG_PUT contains a hidden goto nlmsg_failure */
+ nlh = NLMSG_PUT(skb, 0, userui_sock_seq, type, len);
+ userui_sock_seq++;
+
+ dest = NLMSG_DATA(nlh);
+ if (params && len > 0)
+ memcpy(dest, params, len);
+
+ netlink_unicast(userui_nl, skb, userui_pid, 0);
+
+ /* We may be in an interrupt context so defer waking up userspace */
+ schedule_work(&userui_notify_userspace_work);
+
+ return;
+
+nlmsg_failure:
+ if (skb)
+ kfree_skb(skb);
+}
+
+/*
+ * Set the PF_NOFREEZE flag on the given process to ensure it can run whilst we
+ * are suspending.
+ */
+static int userui_nl_set_nofreeze(int pid)
+{
+ struct task_struct *t;
+ userui_pid = pid;
+
+ read_lock(&tasklist_lock);
+ if ((t = find_task_by_pid(userui_pid)) == NULL) {
+ read_unlock(&tasklist_lock);
+ return -EINVAL;
+ }
+
+ t->flags |= PF_NOFREEZE;
+
+ read_unlock(&tasklist_lock);
+
+ userui_send_message(USERUI_MSG_NOFREEZE_ACK, NULL, 0);
+
+ return 0;
+}
+
+#if CONFIG_PM_DEBUG
+static int is_debugging = 1;
+#else
+static int is_debugging = 0;
+#endif
+
+static void send_whether_debugging(void)
+{
+ userui_send_message(USERUI_MSG_IS_DEBUGGING, &is_debugging, sizeof(int));
+}
+
+/*
+ * Called when the userspace process has informed us that it's ready to roll.
+ */
+static int userui_nl_ready(int version)
+{
+ int ret = 0;
+ if (version != SUSPEND_USERUI_INTERFACE_VERSION) {
+ printk("suspend_userui: Userspace process using invalid interface version\n");
+ SET_RESULT_STATE(SUSPEND_ABORTED);
+ ret = -EINVAL;
+ }
+
+ wake_up_interruptible(&userui_wait_for_process);
+
+ return ret;
+}
+
+static int userui_nl_set_state(int n)
+{
+ /* Only let them change certain settings */
+ static const int suspend_action_mask =
+ (1 << SUSPEND_REBOOT) | (1 << SUSPEND_PAUSE) | (1 << SUSPEND_SLOW) |
+ (1 << SUSPEND_LOGALL) | (1 << SUSPEND_SINGLESTEP) |
+ (1 << SUSPEND_PAUSE_NEAR_PAGESET_END);
+
+ suspend_action = (suspend_action & (~suspend_action_mask)) |
+ (n & suspend_action_mask);
+
+ return 0;
+}
+
+static int userui_nl_set_progress_granularity(int n)
+{
+ if (n < 1) n = 1;
+ progress_granularity = n;
+ return 0;
+}
+
+static int userui_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
+{
+ int type;
+ int *data;
+
+ *errp = 0;
+
+ if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
+ return 0;
+
+ type = nlh->nlmsg_type;
+
+ /* A control message: ignore them */
+ if (type < USERUI_MSG_BASE)
+ return 0;
+
+ /* Unknown message: reply with EINVAL */
+ if (type >= USERUI_MSG_MAX) {
+ *errp = -EINVAL;
+ return -1;
+ }
+
+ /* All operations require privileges, even GET */
+ if (security_netlink_recv(skb)) {
+ *errp = -EPERM;
+ return -1;
+ }
+
+ /* Only allow one task to receive NOFREEZE privileges */
+ if (type == USERUI_MSG_NOFREEZE_ME && userui_pid != -1) {
+ *errp = -EBUSY;
+ return -1;
+ }
+
+ data = (int*)NLMSG_DATA(nlh);
+
+ switch (type) {
+ case USERUI_MSG_NOFREEZE_ME:
+ if ((*errp = userui_nl_set_nofreeze(nlh->nlmsg_pid)))
+ return -1;
+ break;
+ case USERUI_MSG_READY:
+ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+ *errp = -EINVAL;
+ return -1;
+ }
+ if ((*errp = userui_nl_ready(*data)))
+ return -1;
+ break;
+ case USERUI_MSG_ABORT:
+ request_abort_suspend();
+ break;
+ case USERUI_MSG_GET_STATE:
+ userui_send_message(USERUI_MSG_GET_STATE, &suspend_action,
+ sizeof(suspend_action));
+ break;
+ case USERUI_MSG_SET_STATE:
+ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+ *errp = -EINVAL;
+ return -1;
+ }
+ if ((*errp = userui_nl_set_state(*data)))
+ return -1;
+ break;
+ case USERUI_MSG_SET_PROGRESS_GRANULARITY:
+ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+ *errp = -EINVAL;
+ return -1;
+ }
+ if ((*errp = userui_nl_set_progress_granularity(*data)))
+ return -1;
+ break;
+ case USERUI_MSG_SPACE:
+ wake_up_interruptible(&userui_wait_for_key);
+ break;
+ case USERUI_MSG_GET_DEBUGGING:
+ send_whether_debugging();
+ break;
+ }
+
+ return 0;
+}
+
+static int userui_user_rcv_skb(struct sk_buff *skb)
+{
+ int err;
+ struct nlmsghdr *nlh;
+
+ while (skb->len >= NLMSG_SPACE(0)) {
+ u32 rlen;
+
+ nlh = (struct nlmsghdr *) skb->data;
+ if (nlh->nlmsg_len < sizeof(*nlh) ||
+ skb->len < nlh->nlmsg_len)
+ return 0;
+ rlen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (rlen > skb->len)
+ rlen = skb->len;
+ if (userui_user_rcv_msg(skb, nlh, &err) < 0) {
+ if (err == 0)
+ return -1;
+ netlink_ack(skb, nlh, err);
+ } else if (nlh->nlmsg_flags & NLM_F_ACK)
+ netlink_ack(skb, nlh, 0);
+ skb_pull(skb, rlen);
+ }
+
+ return 0;
+}
+
+static void userui_netlink_input(struct sock *sk, int len)
+{
+ do {
+ struct sk_buff *skb;
+ while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+ if (userui_user_rcv_skb(skb)) {
+ if (skb->len)
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ else
+ kfree_skb(skb);
+ break;
+ }
+ kfree_skb(skb);
+ }
+ } while (userui_nl && userui_nl->sk_receive_queue.qlen);
+}
+
+static int open_userui_netlink(void)
+{
+ int i;
+
+ userui_sock_seq = 0x42c0ffee;
+ userui_nl = netlink_kernel_create(NETLINK_SUSPEND2_USERUI, userui_netlink_input);
+ if (!userui_nl) {
+ printk("suspend_userui: Failed to allocate netlink socket.\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < NUM_USERUI_SKBS; i++)
+ userui_skbs[i] = NULL;
+
+ next_free_userui_skb = -1;
+
+ userui_replenish_skbs();
+
+ return 0;
+}
+
+static void close_userui_netlink(void)
+{
+ int i;
+
+ if (userui_nl) {
+ sock_release(userui_nl->sk_socket);
+ userui_nl = NULL;
+ }
+
+ for (i = 0; i < NUM_USERUI_SKBS; i++)
+ if (userui_skbs[i])
+ kfree_skb(userui_skbs[i]);
+}
+
+static int launch_userui_program(void)
+{
+ int retval;
+ static char *envp[] = {
+ "HOME=/",
+ "TERM=linux",
+ "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+ NULL };
+ static char *argv[] = { userui_program, NULL };
+
+ retval = call_usermodehelper(userui_program, argv, envp, 0);
+
+ if (retval)
+ printk("suspend_userui: Failed to launch userui program: Error %d\n", retval);
+
+ return retval;
+}
+
+static int wait_for_userui_contact(void)
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ add_wait_queue(&userui_wait_for_process, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ /* Wait 2 seconds for the userspace UI process to make contact */
+ if (userui_pid == -1 && !TEST_RESULT_STATE(SUSPEND_ABORTED))
+ interruptible_sleep_on_timeout(&userui_wait_for_process, 2*HZ);
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&userui_wait_for_process, &wait);
+
+ return 0;
+}
+
+void userui_redraw(void)
+{
+ if (userui_pid == -1)
+ return;
+
+ userui_send_message(USERUI_MSG_REDRAW, NULL, 0);
+}
+
+void userui_prepare_console(void)
+{
+ userui_pid = -1;
+
+ if (!*userui_program) {
+ printk("suspend_userui: userui_program not configured. suspend_userui disabled.\n");
+ return;
+ }
+
+ if (open_userui_netlink() < 0)
+ return;
+
+ if (launch_userui_program() < 0)
+ goto out_close;
+
+ if (wait_for_userui_contact() < 0)
+ goto out_close;
+
+ if (userui_pid == -1) {
+ printk("suspend_userui: Failed to contact userui process. suspend_userui disabled.\n");
+ goto out_close;
+ }
+
+ return;
+
+out_close:
+ close_userui_netlink();
+}
+
+void userui_cleanup_console(void)
+{
+ struct task_struct *t;
+
+ if (userui_pid == -1)
+ return;
+
+ userui_send_message(USERUI_MSG_CLEANUP, NULL, 0);
+
+ read_lock(&tasklist_lock);
+ if ((t = find_task_by_pid(userui_pid)))
+ t->flags &= ~PF_NOFREEZE;
+ read_unlock(&tasklist_lock);
+
+ close_userui_netlink();
+
+ userui_pid = -1;
+}
+
+static unsigned long userui_storage_needed(void)
+{
+ return sizeof(userui_program);
+}
+
+static int userui_save_config_info(char *buf)
+{
+ *((int *) buf) = progress_granularity;
+ memcpy(buf + sizeof(int), userui_program, sizeof(userui_program));
+ return sizeof(userui_program) + sizeof(int);
+}
+
+static void userui_load_config_info(char *buf, int size)
+{
+ /* Don't load the saved path if one has already been set */
+ if (userui_program[0])
+ return;
+
+ progress_granularity = *((int *) buf);
+ size -= sizeof(int);
+
+ if (size > sizeof(userui_program))
+ size = sizeof(userui_program);
+
+ memcpy(userui_program, buf + sizeof(int), size);
+ userui_program[sizeof(userui_program)-1] = '\0';
+}
+
+static unsigned long userui_memory_needed(void)
+{
+ /* ball park figure of 128 pages */
+ return (128 * PAGE_SIZE);
+}
+
+unsigned long userui_update_progress(unsigned long value, unsigned long maximum,
+ const char *fmt, va_list args)
+{
+ static int last_step = -1;
+ struct userui_msg_params msg;
+ int bitshift = generic_fls(maximum) - 16;
+ int this_step;
+ unsigned long next_update;
+
+ if (userui_pid == -1)
+ return 0;
+
+ if ((!maximum) || (!progress_granularity))
+ return maximum;
+
+ if (value < 0)
+ value = 0;
+
+ if (value > maximum)
+ value = maximum;
+
+ /* Try to avoid math problems - we can't do 64 bit math here
+ * (and shouldn't need it - anyone got screen resolution
+ * of 65536 pixels or more?) */
+ if (bitshift > 0) {
+ unsigned long temp_maximum = maximum >> bitshift;
+ unsigned long temp_value = value >> bitshift;
+ this_step = (int) (temp_value * progress_granularity / temp_maximum);
+ next_update = (((this_step + 1) * temp_maximum / progress_granularity) + 1) << bitshift;
+ } else {
+ this_step = (int) (value * progress_granularity / maximum);
+ next_update = ((this_step + 1) * maximum / progress_granularity) + 1;
+ }
+
+ if (this_step == last_step)
+ return next_update;
+
+ memset(&msg, 0, sizeof(msg));
+
+ msg.a = this_step;
+ msg.b = progress_granularity;
+
+ if (fmt) {
+ vsnprintf(msg.text, sizeof(msg.text), fmt, args);
+ msg.text[sizeof(msg.text)-1] = '\0';
+ }
+
+ userui_send_message(USERUI_MSG_PROGRESS, &msg, sizeof(msg));
+ last_step = this_step;
+
+ return next_update;
+}
+
+/* __suspend_message.
+ *
+ * Description: This function is intended to do the same job as printk, but
+ * without normally logging what is printed. The point is to be
+ * able to get debugging info on screen without filling the logs
+ * with "1/534. ^M 2/534^M. 3/534^M"
+ *
+ * It may be called from an interrupt context - can't sleep!
+ *
+ * Arguments: int mask: The debugging section(s) this message belongs to.
+ * int level: The level of verbosity of this message.
+ * int restartline: Whether to output a \r or \n with this line
+ * (\n if we're logging all output).
+ * const char *fmt, ...: Message to be displayed a la printk.
+ */
+void __suspend_message(unsigned long section, unsigned long level,
+ int normally_logged,
+ const char *fmt, ...)
+{
+ struct userui_msg_params msg;
+
+ va_list args;
+
+ if ((level) && (level > console_loglevel))
+ return;
+
+ if (userui_pid == -1)
+ return;
+
+ memset(&msg, 0, sizeof(msg));
+
+ msg.a = section;
+ msg.b = level;
+ msg.c = normally_logged;
+
+ if (fmt) {
+ va_start(args, fmt);
+ vsnprintf(msg.text, sizeof(msg.text), fmt, args);
+ va_end(args);
+ msg.text[sizeof(msg.text)-1] = '\0';
+ }
+
+ userui_send_message(USERUI_MSG_MESSAGE, &msg, sizeof(msg));
+}
+
+static void wait_for_key_via_userui(void)
+{
+ DECLARE_WAITQUEUE(wait, current);
+
+ add_wait_queue(&userui_wait_for_key, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ interruptible_sleep_on(&userui_wait_for_key);
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&userui_wait_for_key, &wait);
+}
+
+char suspend_wait_for_keypress(int timeout)
+{
+ int fd;
+ char key = '\0';
+ struct termios t, t_backup;
+
+ if (userui_pid != -1) {
+ wait_for_key_via_userui();
+ key = 32;
+ goto out;
+ }
+
+ /* We should be guaranteed /dev/console exists after populate_rootfs() in
+ * init/main.c
+ */
+ if ((fd = sys_open("/dev/console", O_RDONLY, 0)) < 0)
+ goto out;
+
+ if (sys_ioctl(fd, TCGETS, (long)&t) < 0)
+ goto out_close;
+
+ memcpy(&t_backup, &t, sizeof(t));
+
+ t.c_lflag &= ~(ISIG|ICANON|ECHO);
+ t.c_cc[VMIN] = 0;
+ if (timeout)
+ t.c_cc[VTIME] = timeout*10;
+
+ if (sys_ioctl(fd, TCSETS, (long)&t) < 0)
+ goto out_restore;
+
+ while (1) {
+ if (sys_read(fd, &key, 1) <= 0) {
+ key = '\0';
+ break;
+ }
+ key = tolower(key);
+ if (test_suspend_state(SUSPEND_SANITY_CHECK_PROMPT)) {
+ if (key == 'c') {
+ set_suspend_state(SUSPEND_CONTINUE_REQ);
+ break;
+ } else if (key == ' ')
+ break;
+ } else
+ break;
+ }
+
+out_restore:
+ sys_ioctl(fd, TCSETS, (long)&t_backup);
+
+out_close:
+ sys_close(fd);
+out:
+ return key;
+}
+
+/* abort_suspend
+ *
+ * Description: Begin to abort a cycle. If this wasn't at the user's request
+ * (and we're displaying output), tell the user why and wait for
+ * them to acknowledge the message.
+ * Arguments: A parameterised string (imagine this is printk) to display,
+ * telling the user why we're aborting.
+ */
+
+void abort_suspend(const char *fmt, ...)
+{
+ va_list args;
+ int printed_len = 0;
+
+ if (!TEST_RESULT_STATE(SUSPEND_ABORTED)) {
+ if (!TEST_RESULT_STATE(SUSPEND_ABORT_REQUESTED)) {
+ va_start(args, fmt);
+ printed_len = vsnprintf(local_printf_buf,
+ sizeof(local_printf_buf), fmt, args);
+ va_end(args);
+ if (userui_pid != -1)
+ printed_len = sprintf(local_printf_buf + printed_len,
+ " (Press SPACE to continue)");
+ suspend2_prepare_status(1, 1, local_printf_buf);
+
+ /*
+ * Make sure message seen - wait for shift to be
+ * released if being pressed
+ */
+ if (userui_pid != -1)
+ suspend_wait_for_keypress(0);
+ }
+ /* Turn on aborting flag */
+ SET_RESULT_STATE(SUSPEND_ABORTED);
+ }
+}
+
+/* suspend2_prepare_status
+ * Description: Prepare the 'nice display', drawing the header and version,
+ * along with the current action and perhaps also resetting the
+ * progress bar.
+ * Arguments: int printalways: Whether to print the action when debugging
+ * is on.
+ * int clearbar: Whether to reset the progress bar.
+ * const char *fmt, ...: The action to be displayed.
+ */
+void suspend2_prepare_status(int printalways, int clearbar, const char *fmt, ...)
+{
+ va_list args;
+
+ if (fmt) {
+ va_start(args, fmt);
+ lastheader_message_len = vsnprintf(lastheader, 512, fmt, args);
+ va_end(args);
+ }
+
+ if (clearbar)
+ userui_update_progress(0, 1, NULL, NULL);
+
+ __suspend_message(0, SUSPEND_STATUS, 1, lastheader, NULL);
+
+ if (userui_pid == -1)
+ printk("%s\n", lastheader);
+}
+
+/* update_status
+ *
+ * Description: Update the progress bar and (if on) in-bar message.
+ * Arguments: UL value, maximum: Current progress percentage (value/max).
+ * const char *fmt, ...: Message to be displayed in the middle
+ * of the progress bar.
+ * Note that a NULL message does not mean that any previous
+ * message is erased! For that, you need suspend2_prepare_status with
+ * clearbar on.
+ * Returns: Unsigned long: The next value where status needs to be updated.
+ * This is to reduce unnecessary calls to update_status.
+ */
+unsigned long suspend2_update_status(unsigned long value, unsigned long maximum,
+ const char *fmt, ...)
+{
+ unsigned long next_update = maximum;
+ va_list args;
+
+ if (!maximum)
+ return maximum;
+
+ if (value < 0)
+ value = 0;
+
+ if (value > maximum)
+ value = maximum;
+
+ va_start(args, fmt);
+
+ next_update = userui_update_progress(value, maximum, fmt, args);
+
+ va_end(args);
+
+ return next_update;
+}
+
+static struct waiting_message
+{
+ int message;
+ struct waiting_message * next;
+} * waiting_messages = NULL;
+
+/* display_suspend_message
+ *
+ * Description: Display a message as a result of the user pressing a key
+ * and the key being processed in an interrupt handler.
+ */
+
+int display_suspend_messages(void)
+{
+ int did_work = (waiting_messages != NULL);
+
+ while (waiting_messages) {
+ struct waiting_message * this_message = waiting_messages;
+
+ switch(waiting_messages->message) {
+ case 5:
+ suspend2_prepare_status(1, 1,
+ "--- ESCAPE PRESSED AGAIN :"
+ " TRYING HARDER TO ABORT ---");
+ break;
+ case 6:
+ suspend2_prepare_status(1, 1, "--- ESCAPE PRESSED :"
+ " ABORTING PROCESS ---");
+ break;
+ }
+
+ waiting_messages = this_message->next;
+ kfree(this_message);
+ }
+ return did_work;
+}
+
+/* suspend2_schedule_message
+ *
+ * Description:
+ *
+ */
+
+void suspend2_schedule_message(int message_number)
+{
+ struct waiting_message * new_message =
+ kmalloc(sizeof(struct waiting_message), GFP_ATOMIC);
+
+ if (!new_message) {
+ printk("Argh. Unable to allocate memory for "
+ "scheduling the display of a message.\n");
+ return;
+ }
+
+ new_message->message = message_number;
+ new_message->next = waiting_messages;
+
+ waiting_messages = new_message;
+ return;
+}
+
+/* request_abort_suspend
+ *
+ * Description: Handle the user requesting the cancellation of a suspend by
+ * pressing escape. Note that on a second press, we try a little
+ * harder, attempting to forcefully thaw processes. This shouldn't
+ * been needed, and may result in an oops (if we've overwritten
+ * memory), but has been useful on ocassion.
+ * Callers: Invoked from a netlink packet from userspace when the user presses
+ * escape.
+ */
+void request_abort_suspend(void)
+{
+ if (test_suspend_state(SUSPEND_NOW_RESUMING) || (TEST_RESULT_STATE(SUSPEND_ABORT_REQUESTED)))
+ return;
+
+ if (TEST_RESULT_STATE(SUSPEND_ABORTED)) {
+ suspend2_schedule_message(5);
+ show_state();
+ thaw_processes(FREEZER_ALL_THREADS);
+ } else {
+ suspend2_schedule_message(6);
+ SET_RESULT_STATE(SUSPEND_ABORTED);
+ SET_RESULT_STATE(SUSPEND_ABORT_REQUESTED);
+ }
+}
+
+/* check_shift_keys
+ *
+ * Description: Potentially pause and wait for the user to tell us to continue.
+ * We normally only pause when @pause is set.
+ * Arguments: int pause: Whether we normally pause.
+ * char * message: The message to display. Not parameterised
+ * because it's normally a constant.
+ */
+
+void check_shift_keys(int pause, char * message)
+{
+#ifdef CONFIG_PM_DEBUG
+ int displayed_message = 0, last_key = 0;
+
+ display_suspend_messages();
+ while (last_key != 32 &&
+ userui_pid != -1 &&
+ ((TEST_ACTION_STATE(SUSPEND_PAUSE) && pause) ||
+ (TEST_ACTION_STATE(SUSPEND_SINGLESTEP)))) {
+ if (!displayed_message) {
+ suspend2_prepare_status(1, 0,
+ "%s Press SPACE to continue.%s",
+ message ? message : "",
+ (TEST_ACTION_STATE(SUSPEND_SINGLESTEP)) ?
+ " Single step on." : "");
+ displayed_message = 1;
+ }
+ last_key = suspend_wait_for_keypress(0);
+ display_suspend_messages();
+ }
+#else
+ display_suspend_messages();
+#endif
+ schedule();
+}
+
+extern asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd,
+ unsigned long arg);
+
+/* suspend2_prepare_console
+ *
+ * Description: Prepare a console for use, save current settings.
+ * Returns: Boolean: Whether an error occured. Errors aren't
+ * treated as fatal, but a warning is printed.
+ */
+int suspend2_prepare_console(void)
+{
+ orig_loglevel = console_loglevel;
+ orig_default_message_loglevel = default_message_loglevel;
+ orig_kmsg = kmsg_redirect;
+ kmsg_redirect = fg_console + 1;
+ default_message_loglevel = 1;
+ console_loglevel = suspend_default_console_level;
+ userui_prepare_console();
+
+ return 0;
+}
+
+/* suspend2_restore_console
+ *
+ * Description: Restore the settings we saved above.
+ */
+
+void suspend2_cleanup_console(void)
+{
+ userui_cleanup_console();
+ suspend_default_console_level = console_loglevel;
+ console_loglevel = orig_loglevel;
+ kmsg_redirect = orig_kmsg;
+ default_message_loglevel = orig_default_message_loglevel;
+}
+
+/* suspend_early_boot_message()
+ * Description: Handle errors early in the process of booting.
+ * The user may press C to continue booting, perhaps
+ * invalidating the image, or space to reboot.
+ * This works from either the serial console or normally
+ * attached keyboard.
+ *
+ * Note that we come in here from init, while the kernel is
+ * locked. If we want to get events from the serial console,
+ * we need to temporarily unlock the kernel.
+ *
+ * suspend_early_boot_message may also be called post-boot.
+ * In this case, it simply printks the message and returns.
+ *
+ * Arguments: int Whether we are able to erase the image.
+ * int default_answer. What to do when we timeout. This
+ * will normally be continue, but the user might
+ * provide command line options (__setup) to override
+ * particular cases.
+ * Char *. Pointer to a string explaining why we're moaning.
+ */
+
+#define say(message, a...) printk(KERN_EMERG message, ##a)
+#define message_timeout 25 /* message_timeout * 10 must fit in 8 bits */
+
+int suspend_early_boot_message(int can_erase_image, int default_answer, char *warning_reason, ...)
+{
+ unsigned long orig_state = get_suspend_state(), continue_req = 0;
+ va_list args;
+ int printed_len;
+
+ if (warning_reason) {
+ va_start(args, warning_reason);
+ printed_len = vsnprintf(local_printf_buf,
+ sizeof(local_printf_buf),
+ warning_reason,
+ args);
+ va_end(args);
+ }
+
+ if (!test_suspend_state(SUSPEND_BOOT_TIME)) {
+ printk(name_suspend "%s", local_printf_buf);
+ return default_answer;
+ }
+
+ /* We might be called directly from do_mounts_initrd if the
+ * user fails to set up their initrd properly. We need to
+ * enable the keyboard handler by setting the running flag */
+ set_suspend_state(SUSPEND_RUNNING);
+
+#if defined(CONFIG_VT) || defined(CONFIG_SERIAL_CONSOLE)
+ console_loglevel = 7;
+
+ say("=== Software Suspend ===\n\n");
+ if (warning_reason) {
+ say("BIG FAT WARNING!! %s\n\n", local_printf_buf);
+ if (can_erase_image) {
+ say("If you want to use the current suspend image, reboot and try\n");
+ say("again with the same kernel that you suspended from. If you want\n");
+ say("to forget that image, continue and the image will be erased.\n");
+ } else {
+ say("If you continue booting, note that any image WILL NOT BE REMOVED.\n");
+ say("Suspend is unable to do so because the appropriate modules aren't\n");
+ say("loaded. You should manually remove the image to avoid any\n");
+ say("possibility of corrupting your filesystem(s) later.\n");
+ }
+ say("Press SPACE to reboot or C to continue booting with this kernel\n\n");
+ say("Default action if you don't select one in %d seconds is: %s.\n",
+ message_timeout,
+ default_answer == SUSPEND_CONTINUE_REQ ?
+ "continue booting" : "reboot");
+ } else {
+ say("BIG FAT WARNING!!\n\n");
+ say("You have tried to resume from this image before.\n");
+ say("If it failed once, may well fail again.\n");
+ say("Would you like to remove the image and boot normally?\n");
+ say("This will be equivalent to entering noresume2 on the\n");
+ say("kernel command line.\n\n");
+ say("Press SPACE to remove the image or C to continue resuming.\n\n");
+ say("Default action if you don't select one in %d seconds is: %s.\n",
+ message_timeout,
+ !!default_answer ?
+ "continue resuming" : "remove the image");
+ }
+
+ set_suspend_state(SUSPEND_SANITY_CHECK_PROMPT);
+ clear_suspend_state(SUSPEND_CONTINUE_REQ);
+
+ if (suspend_wait_for_keypress(message_timeout) == 0) /* We timed out */
+ continue_req = !!default_answer;
+ else
+ continue_req = test_suspend_state(SUSPEND_CONTINUE_REQ);
+
+ if ((warning_reason) && (!continue_req))
+ machine_restart(NULL);
+
+ restore_suspend_state(orig_state);
+ if (continue_req)
+ set_suspend_state(SUSPEND_CONTINUE_REQ);
+
+#endif // CONFIG_VT or CONFIG_SERIAL_CONSOLE
+ return -EPERM;
+}
+#undef say
+
+/*
+ * User interface specific /proc/suspend entries.
+ */
+
+static struct suspend_proc_data proc_params[] = {
+#ifdef CONFIG_PROC_FS
+ { .filename = "default_console_level",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_INTEGER,
+ .data = {
+ .integer = {
+ .variable = &suspend_default_console_level,
+ .minimum = 0,
+#ifdef CONFIG_PM_DEBUG
+ .maximum = 7,
+#else
+ .maximum = 1,
+#endif
+
+ }
+ }
+ },
+
+ { .filename = "enable_escape",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_BIT,
+ .data = {
+ .bit = {
+ .bit_vector = &suspend_action,
+ .bit = SUSPEND_CAN_CANCEL,
+ }
+ }
+ },
+
+#ifdef CONFIG_PM_DEBUG
+ { .filename = "debug_sections",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_UL,
+ .data = {
+ .ul = {
+ .variable = &suspend_debug_state,
+ .minimum = 0,
+ .maximum = 2 << 30,
+ }
+ }
+ },
+
+ { .filename = "log_everything",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_BIT,
+ .data = {
+ .bit = {
+ .bit_vector = &suspend_action,
+ .bit = SUSPEND_LOGALL,
+ }
+ }
+ },
+
+ { .filename = "pause_between_steps",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_BIT,
+ .data = {
+ .bit = {
+ .bit_vector = &suspend_action,
+ .bit = SUSPEND_PAUSE,
+ }
+ }
+ },
+#endif
+ { .filename = "disable_userui_support",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_INTEGER,
+ .data = {
+ .integer = {
+ .variable = &userui_ops.disabled,
+ .minimum = 0,
+ .maximum = 1,
+ }
+ }
+ },
+ { .filename = "userui_progress_granularity",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_INTEGER,
+ .data = {
+ .integer = {
+ .variable = &progress_granularity,
+ .minimum = 1,
+ .maximum = 2048,
+ }
+ }
+ },
+ { .filename = "userui_program",
+ .permissions = PROC_RW,
+ .type = SUSPEND_PROC_DATA_STRING,
+ .data = {
+ .string = {
+ .variable = userui_program,
+ .max_length = 255,
+ }
+ }
+ }
+#endif
+};
+
+static struct suspend_plugin_ops userui_ops = {
+ .type = MISC_PLUGIN,
+ .name = "Userspace UI Support",
+ .module = THIS_MODULE,
+ .storage_needed = userui_storage_needed,
+ .save_config_info = userui_save_config_info,
+ .load_config_info = userui_load_config_info,
+ .memory_needed = userui_memory_needed,
+};
+
+/* suspend_console_proc_init
+ * Description: Boot time initialisation for user interface.
+ */
+static __init int suspend_console_proc_init(void)
+{
+ int result, i, numfiles = sizeof(proc_params) / sizeof(struct suspend_proc_data);
+
+ if (!(result = suspend_register_plugin(&userui_ops)))
+ for (i=0; i< numfiles; i++)
+ suspend_register_procfile(&proc_params[i]);
+
+ userui_nl = NULL;
+ userui_program[0] = '\0';
+
+ return result;
+}
+
+late_initcall(suspend_console_proc_init);
diff -ruNp 620-userui-header.patch-old/kernel/power/suspend2_core/ui.h 620-userui-header.patch-new/kernel/power/suspend2_core/ui.h
--- 620-userui-header.patch-old/kernel/power/suspend2_core/ui.h 1970-01-01 10:00:00.000000000 +1000
+++ 620-userui-header.patch-new/kernel/power/suspend2_core/ui.h 2005-07-04 23:14:19.000000000 +1000
@@ -0,0 +1,20 @@
+/*
+ *
+ */
+
+extern int suspend2_prepare_console(void);
+extern void suspend2_cleanup_console(void);
+
+extern void check_shift_keys(int pause, char * message);
+
+extern void suspend2_prepare_status(int printalways, int clearbar, const char *fmt, ...);
+extern void check_shift_keys(int pause, char * message);
+extern unsigned long suspend2_update_status(unsigned long value, unsigned long maximum,
+ const char *fmt, ...);
+
+extern void request_abort_suspend(void);
+extern void abort_suspend(const char *fmt, ...);
+
+extern void suspend2_schedule_message (int message_number);
+
+extern void userui_redraw(void);
diff -ruNp 620-userui-header.patch-old/kernel/power/suspend2_core/userui.h 620-userui-header.patch-new/kernel/power/suspend2_core/userui.h
--- 620-userui-header.patch-old/kernel/power/suspend2_core/userui.h 1970-01-01 10:00:00.000000000 +1000
+++ 620-userui-header.patch-new/kernel/power/suspend2_core/userui.h 2005-07-04 23:14:19.000000000 +1000
@@ -0,0 +1,36 @@
+#ifndef _SUSPEND_USERUI_H_
+#define _SUSPEND_USERUI_H_
+
+#define SUSPEND_USERUI_INTERFACE_VERSION 5
+
+enum {
+ USERUI_MSG_BASE = 0x10,
+
+ /* Userspace -> Kernel */
+ USERUI_MSG_READY = 0x10,
+ USERUI_MSG_ABORT = 0x11,
+ USERUI_MSG_SET_STATE = 0x12,
+ USERUI_MSG_GET_STATE = 0x13,
+ USERUI_MSG_NOFREEZE_ME = 0x16,
+ USERUI_MSG_SET_PROGRESS_GRANULARITY = 0x17,
+ USERUI_MSG_SPACE = 0x18,
+ USERUI_MSG_GET_DEBUGGING = 0x19,
+
+ /* Kernel -> Userspace */
+ USERUI_MSG_MESSAGE = 0x21,
+ USERUI_MSG_PROGRESS = 0x22,
+ USERUI_MSG_CLEANUP = 0x24,
+ USERUI_MSG_REDRAW = 0x25,
+ USERUI_MSG_KEYPRESS = 0x26,
+ USERUI_MSG_NOFREEZE_ACK = 0x27,
+ USERUI_MSG_IS_DEBUGGING = 0x28,
+
+ USERUI_MSG_MAX,
+};
+
+struct userui_msg_params {
+ unsigned long a, b, c, d;
+ char text[80];
+};
+
+#endif /* _SUSPEND_USERUI_H_ */
-
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