diff options
Diffstat (limited to 'kernel/power/tuxonice_builtin.c')
| -rw-r--r-- | kernel/power/tuxonice_builtin.c | 498 |
1 files changed, 498 insertions, 0 deletions
diff --git a/kernel/power/tuxonice_builtin.c b/kernel/power/tuxonice_builtin.c new file mode 100644 index 000000000..22bf07a43 --- /dev/null +++ b/kernel/power/tuxonice_builtin.c @@ -0,0 +1,498 @@ +/* + * Copyright (C) 2004-2015 Nigel Cunningham (nigel at nigelcunningham com au) + * + * This file is released under the GPLv2. + */ +#include <linux/kernel.h> +#include <linux/swap.h> +#include <linux/syscalls.h> +#include <linux/bio.h> +#include <linux/root_dev.h> +#include <linux/freezer.h> +#include <linux/reboot.h> +#include <linux/writeback.h> +#include <linux/tty.h> +#include <linux/crypto.h> +#include <linux/cpu.h> +#include <linux/ctype.h> +#include <linux/kthread.h> +#include "tuxonice_io.h" +#include "tuxonice.h" +#include "tuxonice_extent.h" +#include "tuxonice_netlink.h" +#include "tuxonice_prepare_image.h" +#include "tuxonice_ui.h" +#include "tuxonice_sysfs.h" +#include "tuxonice_pagedir.h" +#include "tuxonice_modules.h" +#include "tuxonice_builtin.h" +#include "tuxonice_power_off.h" +#include "tuxonice_alloc.h" + +unsigned long toi_bootflags_mask; + +/* + * Highmem related functions (x86 only). + */ + +#ifdef CONFIG_HIGHMEM + +/** + * copyback_high: Restore highmem pages. + * + * Highmem data and pbe lists are/can be stored in highmem. + * The format is slightly different to the lowmem pbe lists + * used for the assembly code: the last pbe in each page is + * a struct page * instead of struct pbe *, pointing to the + * next page where pbes are stored (or NULL if happens to be + * the end of the list). Since we don't want to generate + * unnecessary deltas against swsusp code, we use a cast + * instead of a union. + **/ + +static void copyback_high(void) +{ + struct page *pbe_page = (struct page *) restore_highmem_pblist; + struct pbe *this_pbe, *first_pbe; + unsigned long *origpage, *copypage; + int pbe_index = 1; + + if (!pbe_page) + return; + + this_pbe = (struct pbe *) kmap_atomic(pbe_page); + first_pbe = this_pbe; + + while (this_pbe) { + int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1; + + origpage = kmap_atomic(pfn_to_page((unsigned long) this_pbe->orig_address)); + copypage = kmap_atomic((struct page *) this_pbe->address); + + while (loop >= 0) { + *(origpage + loop) = *(copypage + loop); + loop--; + } + + kunmap_atomic(origpage); + kunmap_atomic(copypage); + + if (!this_pbe->next) + break; + + if (pbe_index < PBES_PER_PAGE) { + this_pbe++; + pbe_index++; + } else { + pbe_page = (struct page *) this_pbe->next; + kunmap_atomic(first_pbe); + if (!pbe_page) + return; + this_pbe = (struct pbe *) kmap_atomic(pbe_page); + first_pbe = this_pbe; + pbe_index = 1; + } + } + kunmap_atomic(first_pbe); +} + +#else /* CONFIG_HIGHMEM */ +static void copyback_high(void) { } +#endif + +char toi_wait_for_keypress_dev_console(int timeout) +{ + int fd, this_timeout = 255, orig_kthread = 0; + char key = '\0'; + struct termios t, t_backup; + + /* We should be guaranteed /dev/console exists after populate_rootfs() + * in init/main.c. + */ + fd = sys_open("/dev/console", O_RDONLY, 0); + if (fd < 0) { + printk(KERN_INFO "Couldn't open /dev/console.\n"); + return key; + } + + 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; + +new_timeout: + if (timeout > 0) { + this_timeout = timeout < 26 ? timeout : 25; + timeout -= this_timeout; + this_timeout *= 10; + } + + t.c_cc[VTIME] = this_timeout; + + if (sys_ioctl(fd, TCSETS, (long)&t) < 0) + goto out_restore; + + if (current->flags & PF_KTHREAD) { + orig_kthread = (current->flags & PF_KTHREAD); + current->flags &= ~PF_KTHREAD; + } + + while (1) { + if (sys_read(fd, &key, 1) <= 0) { + if (timeout) + goto new_timeout; + key = '\0'; + break; + } + key = tolower(key); + if (test_toi_state(TOI_SANITY_CHECK_PROMPT)) { + if (key == 'c') { + set_toi_state(TOI_CONTINUE_REQ); + break; + } else if (key == ' ') + break; + } else + break; + } + if (orig_kthread) { + current->flags |= PF_KTHREAD; + } + +out_restore: + sys_ioctl(fd, TCSETS, (long)&t_backup); +out_close: + sys_close(fd); + + return key; +} + +struct toi_boot_kernel_data toi_bkd __nosavedata + __attribute__((aligned(PAGE_SIZE))) = { + MY_BOOT_KERNEL_DATA_VERSION, + 0, +#ifdef CONFIG_TOI_REPLACE_SWSUSP + (1 << TOI_REPLACE_SWSUSP) | +#endif + (1 << TOI_NO_FLUSHER_THREAD) | + (1 << TOI_PAGESET2_FULL), +}; + +struct block_device *toi_open_by_devnum(dev_t dev) +{ + struct block_device *bdev = bdget(dev); + int err = -ENOMEM; + if (bdev) + err = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); + return err ? ERR_PTR(err) : bdev; +} + +/** + * toi_close_bdev: Close a swap bdev. + * + * int: The swap entry number to close. + */ +void toi_close_bdev(struct block_device *bdev) +{ + blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); +} + +int toi_wait = CONFIG_TOI_DEFAULT_WAIT; +struct toi_core_fns *toi_core_fns; +unsigned long toi_result; +struct pagedir pagedir1 = {1}; +struct toi_cbw **toi_first_cbw; +int toi_next_cbw; + +unsigned long toi_get_nonconflicting_page(void) +{ + return toi_core_fns->get_nonconflicting_page(); +} + +int toi_post_context_save(void) +{ + return toi_core_fns->post_context_save(); +} + +int try_tuxonice_hibernate(void) +{ + if (!toi_core_fns) + return -ENODEV; + + return toi_core_fns->try_hibernate(); +} + +static int num_resume_calls; +#ifdef CONFIG_TOI_IGNORE_LATE_INITCALL +static int ignore_late_initcall = 1; +#else +static int ignore_late_initcall; +#endif + +int toi_translate_err_default = TOI_CONTINUE_REQ; + +void try_tuxonice_resume(void) +{ + if (!hibernation_available()) + return; + + /* Don't let it wrap around eventually */ + if (num_resume_calls < 2) + num_resume_calls++; + + if (num_resume_calls == 1 && ignore_late_initcall) { + printk(KERN_INFO "TuxOnIce: Ignoring late initcall, as requested.\n"); + return; + } + + if (toi_core_fns) + toi_core_fns->try_resume(); + else + printk(KERN_INFO "TuxOnIce core not loaded yet.\n"); +} + +int toi_lowlevel_builtin(void) +{ + int error = 0; + + save_processor_state(); + error = swsusp_arch_suspend(); + if (error) + printk(KERN_ERR "Error %d hibernating\n", error); + + /* Restore control flow appears here */ + if (!toi_in_hibernate) { + copyback_high(); + set_toi_state(TOI_NOW_RESUMING); + } + + restore_processor_state(); + return error; +} + +unsigned long toi_compress_bytes_in; +unsigned long toi_compress_bytes_out; + +int toi_in_suspend(void) +{ + return in_suspend; +} + +unsigned long toi_state = ((1 << TOI_BOOT_TIME) | + (1 << TOI_IGNORE_LOGLEVEL) | + (1 << TOI_IO_STOPPED)); + +/* The number of hibernates we have started (some may have been cancelled) */ +unsigned int nr_hibernates; +int toi_running; +__nosavedata int toi_in_hibernate; +__nosavedata struct pbe *restore_highmem_pblist; + +int toi_trace_allocs; + +void toi_read_lock_tasklist(void) +{ + read_lock(&tasklist_lock); +} + +void toi_read_unlock_tasklist(void) +{ + read_unlock(&tasklist_lock); +} + +#ifdef CONFIG_TOI_ZRAM_SUPPORT +int (*toi_flag_zram_disks) (void); + +int toi_do_flag_zram_disks(void) +{ + return toi_flag_zram_disks ? (*toi_flag_zram_disks)() : 0; +} + +#endif + +/* toi_generate_free_page_map + * + * Description: This routine generates a bitmap of free pages from the + * lists used by the memory manager. We then use the bitmap + * to quickly calculate which pages to save and in which + * pagesets. + */ +void toi_generate_free_page_map(void) +{ + int order, cpu, t; + unsigned long flags, i; + struct zone *zone; + struct list_head *curr; + unsigned long pfn; + struct page *page; + + for_each_populated_zone(zone) { + + if (!zone->spanned_pages) + continue; + + spin_lock_irqsave(&zone->lock, flags); + + for (i = 0; i < zone->spanned_pages; i++) { + pfn = zone->zone_start_pfn + i; + + if (!pfn_valid(pfn)) + continue; + + page = pfn_to_page(pfn); + + ClearPageNosaveFree(page); + } + + for_each_migratetype_order(order, t) { + list_for_each(curr, + &zone->free_area[order].free_list[t]) { + unsigned long j; + + pfn = page_to_pfn(list_entry(curr, struct page, + lru)); + for (j = 0; j < (1UL << order); j++) + SetPageNosaveFree(pfn_to_page(pfn + j)); + } + } + + for_each_online_cpu(cpu) { + struct per_cpu_pageset *pset = + per_cpu_ptr(zone->pageset, cpu); + struct per_cpu_pages *pcp = &pset->pcp; + struct page *page; + int t; + + for (t = 0; t < MIGRATE_PCPTYPES; t++) + list_for_each_entry(page, &pcp->lists[t], lru) + SetPageNosaveFree(page); + } + + spin_unlock_irqrestore(&zone->lock, flags); + } +} + +/* toi_size_of_free_region + * + * Description: Return the number of pages that are free, beginning with and + * including this one. + */ +int toi_size_of_free_region(struct zone *zone, unsigned long start_pfn) +{ + unsigned long this_pfn = start_pfn, + end_pfn = zone_end_pfn(zone); + + while (pfn_valid(this_pfn) && this_pfn < end_pfn && PageNosaveFree(pfn_to_page(this_pfn))) + this_pfn++; + + return this_pfn - start_pfn; +} + +static int __init toi_wait_setup(char *str) +{ + int value; + + if (sscanf(str, "=%d", &value)) { + if (value < -1 || value > 255) + printk(KERN_INFO "TuxOnIce_wait outside range -1 to " + "255.\n"); + else + toi_wait = value; + } + + return 1; +} +__setup("toi_wait", toi_wait_setup); + +static int __init toi_translate_retry_setup(char *str) +{ + toi_translate_err_default = 0; + return 1; +} +__setup("toi_translate_retry", toi_translate_retry_setup); + +static int __init toi_debug_setup(char *str) +{ + toi_bkd.toi_action |= (1 << TOI_LOGALL); + toi_bootflags_mask |= (1 << TOI_LOGALL); + toi_bkd.toi_debug_state = 255; + toi_bkd.toi_default_console_level = 7; + return 1; +} +__setup("toi_debug_setup", toi_debug_setup); + +static int __init toi_pause_setup(char *str) +{ + toi_bkd.toi_action |= (1 << TOI_PAUSE); + toi_bootflags_mask |= (1 << TOI_PAUSE); + return 1; +} +__setup("toi_pause", toi_pause_setup); + +#ifdef CONFIG_PM_DEBUG +static int __init toi_trace_allocs_setup(char *str) +{ + int value; + + if (sscanf(str, "=%d", &value)) + toi_trace_allocs = value; + + return 1; +} +__setup("toi_trace_allocs", toi_trace_allocs_setup); +#endif + +static int __init toi_ignore_late_initcall_setup(char *str) +{ + int value; + + if (sscanf(str, "=%d", &value)) + ignore_late_initcall = value; + + return 1; +} +__setup("toi_initramfs_resume_only", toi_ignore_late_initcall_setup); + +static int __init toi_force_no_multithreaded_setup(char *str) +{ + int value; + + toi_bkd.toi_action &= ~(1 << TOI_NO_MULTITHREADED_IO); + toi_bootflags_mask |= (1 << TOI_NO_MULTITHREADED_IO); + + if (sscanf(str, "=%d", &value) && value) + toi_bkd.toi_action |= (1 << TOI_NO_MULTITHREADED_IO); + + return 1; +} +__setup("toi_no_multithreaded", toi_force_no_multithreaded_setup); + +#ifdef CONFIG_KGDB +static int __init toi_post_resume_breakpoint_setup(char *str) +{ + int value; + + toi_bkd.toi_action &= ~(1 << TOI_POST_RESUME_BREAKPOINT); + toi_bootflags_mask |= (1 << TOI_POST_RESUME_BREAKPOINT); + if (sscanf(str, "=%d", &value) && value) + toi_bkd.toi_action |= (1 << TOI_POST_RESUME_BREAKPOINT); + + return 1; +} +__setup("toi_post_resume_break", toi_post_resume_breakpoint_setup); +#endif + +static int __init toi_disable_readahead_setup(char *str) +{ + int value; + + toi_bkd.toi_action &= ~(1 << TOI_NO_READAHEAD); + toi_bootflags_mask |= (1 << TOI_NO_READAHEAD); + if (sscanf(str, "=%d", &value) && value) + toi_bkd.toi_action |= (1 << TOI_NO_READAHEAD); + + return 1; +} +__setup("toi_no_readahead", toi_disable_readahead_setup); |