diff options
Diffstat (limited to 'kernel/power/tuxonice_atomic_copy.c')
| -rw-r--r-- | kernel/power/tuxonice_atomic_copy.c | 469 |
1 files changed, 0 insertions, 469 deletions
diff --git a/kernel/power/tuxonice_atomic_copy.c b/kernel/power/tuxonice_atomic_copy.c deleted file mode 100644 index 5845217f8..000000000 --- a/kernel/power/tuxonice_atomic_copy.c +++ /dev/null @@ -1,469 +0,0 @@ -/* - * kernel/power/tuxonice_atomic_copy.c - * - * Copyright 2004-2015 Nigel Cunningham (nigel at nigelcunningham com au) - * - * Distributed under GPLv2. - * - * Routines for doing the atomic save/restore. - */ - -#include <linux/suspend.h> -#include <linux/highmem.h> -#include <linux/cpu.h> -#include <linux/freezer.h> -#include <linux/console.h> -#include <linux/syscore_ops.h> -#include <linux/ftrace.h> -#include <asm/suspend.h> -#include "tuxonice.h" -#include "tuxonice_storage.h" -#include "tuxonice_power_off.h" -#include "tuxonice_ui.h" -#include "tuxonice_io.h" -#include "tuxonice_prepare_image.h" -#include "tuxonice_pageflags.h" -#include "tuxonice_checksum.h" -#include "tuxonice_builtin.h" -#include "tuxonice_atomic_copy.h" -#include "tuxonice_alloc.h" -#include "tuxonice_modules.h" - -unsigned long extra_pd1_pages_used; - -/** - * free_pbe_list - free page backup entries used by the atomic copy code. - * @list: List to free. - * @highmem: Whether the list is in highmem. - * - * Normally, this function isn't used. If, however, we need to abort before - * doing the atomic copy, we use this to free the pbes previously allocated. - **/ -static void free_pbe_list(struct pbe **list, int highmem) -{ - while (*list) { - int i; - struct pbe *free_pbe, *next_page = NULL; - struct page *page; - - if (highmem) { - page = (struct page *) *list; - free_pbe = (struct pbe *) kmap(page); - } else { - page = virt_to_page(*list); - free_pbe = *list; - } - - for (i = 0; i < PBES_PER_PAGE; i++) { - if (!free_pbe) - break; - if (highmem) - toi__free_page(29, free_pbe->address); - else - toi_free_page(29, - (unsigned long) free_pbe->address); - free_pbe = free_pbe->next; - } - - if (highmem) { - if (free_pbe) - next_page = free_pbe; - kunmap(page); - } else { - if (free_pbe) - next_page = free_pbe; - } - - toi__free_page(29, page); - *list = (struct pbe *) next_page; - }; -} - -/** - * copyback_post - post atomic-restore actions - * - * After doing the atomic restore, we have a few more things to do: - * 1) We want to retain some values across the restore, so we now copy - * these from the nosave variables to the normal ones. - * 2) Set the status flags. - * 3) Resume devices. - * 4) Tell userui so it can redraw & restore settings. - * 5) Reread the page cache. - **/ -void copyback_post(void) -{ - struct toi_boot_kernel_data *bkd = - (struct toi_boot_kernel_data *) boot_kernel_data_buffer; - - if (toi_activate_storage(1)) - panic("Failed to reactivate our storage."); - - toi_post_atomic_restore_modules(bkd); - - toi_cond_pause(1, "About to reload secondary pagedir."); - - if (read_pageset2(0)) - panic("Unable to successfully reread the page cache."); - - /* - * If the user wants to sleep again after resuming from full-off, - * it's most likely to be in order to suspend to ram, so we'll - * do this check after loading pageset2, to give them the fastest - * wakeup when they are ready to use the computer again. - */ - toi_check_resleep(); - - if (test_action_state(TOI_INCREMENTAL_IMAGE)) - toi_reset_dirtiness(1); -} - -/** - * toi_copy_pageset1 - do the atomic copy of pageset1 - * - * Make the atomic copy of pageset1. We can't use copy_page (as we once did) - * because we can't be sure what side effects it has. On my old Duron, with - * 3DNOW, kernel_fpu_begin increments preempt count, making our preempt - * count at resume time 4 instead of 3. - * - * We don't want to call kmap_atomic unconditionally because it has the side - * effect of incrementing the preempt count, which will leave it one too high - * post resume (the page containing the preempt count will be copied after - * its incremented. This is essentially the same problem. - **/ -void toi_copy_pageset1(void) -{ - int i; - unsigned long source_index, dest_index; - - memory_bm_position_reset(pageset1_map); - memory_bm_position_reset(pageset1_copy_map); - - source_index = memory_bm_next_pfn(pageset1_map, 0); - dest_index = memory_bm_next_pfn(pageset1_copy_map, 0); - - for (i = 0; i < pagedir1.size; i++) { - unsigned long *origvirt, *copyvirt; - struct page *origpage, *copypage; - int loop = (PAGE_SIZE / sizeof(unsigned long)) - 1, - was_present1, was_present2; - - origpage = pfn_to_page(source_index); - copypage = pfn_to_page(dest_index); - - origvirt = PageHighMem(origpage) ? - kmap_atomic(origpage) : - page_address(origpage); - - copyvirt = PageHighMem(copypage) ? - kmap_atomic(copypage) : - page_address(copypage); - - was_present1 = kernel_page_present(origpage); - if (!was_present1) - kernel_map_pages(origpage, 1, 1); - - was_present2 = kernel_page_present(copypage); - if (!was_present2) - kernel_map_pages(copypage, 1, 1); - - while (loop >= 0) { - *(copyvirt + loop) = *(origvirt + loop); - loop--; - } - - if (!was_present1) - kernel_map_pages(origpage, 1, 0); - - if (!was_present2) - kernel_map_pages(copypage, 1, 0); - - if (PageHighMem(origpage)) - kunmap_atomic(origvirt); - - if (PageHighMem(copypage)) - kunmap_atomic(copyvirt); - - source_index = memory_bm_next_pfn(pageset1_map, 0); - dest_index = memory_bm_next_pfn(pageset1_copy_map, 0); - } -} - -/** - * __toi_post_context_save - steps after saving the cpu context - * - * Steps taken after saving the CPU state to make the actual - * atomic copy. - * - * Called from swsusp_save in snapshot.c via toi_post_context_save. - **/ -int __toi_post_context_save(void) -{ - unsigned long old_ps1_size = pagedir1.size; - - check_checksums(); - - free_checksum_pages(); - - toi_recalculate_image_contents(1); - - extra_pd1_pages_used = pagedir1.size > old_ps1_size ? - pagedir1.size - old_ps1_size : 0; - - if (extra_pd1_pages_used > extra_pd1_pages_allowance) { - printk(KERN_INFO "Pageset1 has grown by %lu pages. " - "extra_pages_allowance is currently only %lu.\n", - pagedir1.size - old_ps1_size, - extra_pd1_pages_allowance); - - /* - * Highlevel code will see this, clear the state and - * retry if we haven't already done so twice. - */ - if (any_to_free(1)) { - set_abort_result(TOI_EXTRA_PAGES_ALLOW_TOO_SMALL); - return 1; - } - if (try_allocate_extra_memory()) { - printk(KERN_INFO "Failed to allocate the extra memory" - " needed. Restarting the process."); - set_abort_result(TOI_EXTRA_PAGES_ALLOW_TOO_SMALL); - return 1; - } - printk(KERN_INFO "However it looks like there's enough" - " free ram and storage to handle this, so " - " continuing anyway."); - /* - * What if try_allocate_extra_memory above calls - * toi_allocate_extra_pagedir_memory and it allocs a new - * slab page via toi_kzalloc which should be in ps1? So... - */ - toi_recalculate_image_contents(1); - } - - if (!test_action_state(TOI_TEST_FILTER_SPEED) && - !test_action_state(TOI_TEST_BIO)) - toi_copy_pageset1(); - - return 0; -} - -/** - * toi_hibernate - high level code for doing the atomic copy - * - * High-level code which prepares to do the atomic copy. Loosely based - * on the swsusp version, but with the following twists: - * - We set toi_running so the swsusp code uses our code paths. - * - We give better feedback regarding what goes wrong if there is a - * problem. - * - We use an extra function to call the assembly, just in case this code - * is in a module (return address). - **/ -int toi_hibernate(void) -{ - int error; - - error = toi_lowlevel_builtin(); - - if (!error) { - struct toi_boot_kernel_data *bkd = - (struct toi_boot_kernel_data *) boot_kernel_data_buffer; - - /* - * The boot kernel's data may be larger (newer version) or - * smaller (older version) than ours. Copy the minimum - * of the two sizes, so that we don't overwrite valid values - * from pre-atomic copy. - */ - - memcpy(&toi_bkd, (char *) boot_kernel_data_buffer, - min_t(int, sizeof(struct toi_boot_kernel_data), - bkd->size)); - } - - return error; -} - -/** - * toi_atomic_restore - prepare to do the atomic restore - * - * Get ready to do the atomic restore. This part gets us into the same - * state we are in prior to do calling do_toi_lowlevel while - * hibernating: hot-unplugging secondary cpus and freeze processes, - * before starting the thread that will do the restore. - **/ -int toi_atomic_restore(void) -{ - int error; - - toi_prepare_status(DONT_CLEAR_BAR, "Atomic restore."); - - memcpy(&toi_bkd.toi_nosave_commandline, saved_command_line, - strlen(saved_command_line)); - - toi_pre_atomic_restore_modules(&toi_bkd); - - if (add_boot_kernel_data_pbe()) - goto Failed; - - toi_prepare_status(DONT_CLEAR_BAR, "Doing atomic copy/restore."); - - if (toi_go_atomic(PMSG_QUIESCE, 0)) - goto Failed; - - /* We'll ignore saved state, but this gets preempt count (etc) right */ - save_processor_state(); - - error = swsusp_arch_resume(); - /* - * Code below is only ever reached in case of failure. Otherwise - * execution continues at place where swsusp_arch_suspend was called. - * - * We don't know whether it's safe to continue (this shouldn't happen), - * so lets err on the side of caution. - */ - BUG(); - -Failed: - free_pbe_list(&restore_pblist, 0); -#ifdef CONFIG_HIGHMEM - free_pbe_list(&restore_highmem_pblist, 1); -#endif - return 1; -} - -/** - * toi_go_atomic - do the actual atomic copy/restore - * @state: The state to use for dpm_suspend_start & power_down calls. - * @suspend_time: Whether we're suspending or resuming. - **/ -int toi_go_atomic(pm_message_t state, int suspend_time) -{ - if (suspend_time) { - if (platform_begin(1)) { - set_abort_result(TOI_PLATFORM_PREP_FAILED); - toi_end_atomic(ATOMIC_STEP_PLATFORM_END, suspend_time, 3); - return 1; - } - - if (dpm_prepare(PMSG_FREEZE)) { - set_abort_result(TOI_DPM_PREPARE_FAILED); - dpm_complete(PMSG_RECOVER); - toi_end_atomic(ATOMIC_STEP_PLATFORM_END, suspend_time, 3); - return 1; - } - } - - suspend_console(); - pm_restrict_gfp_mask(); - - if (suspend_time) { - if (dpm_suspend(state)) { - set_abort_result(TOI_DPM_SUSPEND_FAILED); - toi_end_atomic(ATOMIC_STEP_DEVICE_RESUME, suspend_time, 3); - return 1; - } - } else { - if (dpm_suspend_start(state)) { - set_abort_result(TOI_DPM_SUSPEND_FAILED); - toi_end_atomic(ATOMIC_STEP_DEVICE_RESUME, suspend_time, 3); - return 1; - } - } - - /* At this point, dpm_suspend_start() has been called, but *not* - * dpm_suspend_noirq(). We *must* dpm_suspend_noirq() now. - * Otherwise, drivers for some devices (e.g. interrupt controllers) - * become desynchronized with the actual state of the hardware - * at resume time, and evil weirdness ensues. - */ - - if (dpm_suspend_end(state)) { - set_abort_result(TOI_DEVICE_REFUSED); - toi_end_atomic(ATOMIC_STEP_DEVICE_RESUME, suspend_time, 1); - return 1; - } - - if (suspend_time) { - if (platform_pre_snapshot(1)) - set_abort_result(TOI_PRE_SNAPSHOT_FAILED); - } else { - if (platform_pre_restore(1)) - set_abort_result(TOI_PRE_RESTORE_FAILED); - } - - if (test_result_state(TOI_ABORTED)) { - toi_end_atomic(ATOMIC_STEP_PLATFORM_FINISH, suspend_time, 1); - return 1; - } - - if (disable_nonboot_cpus()) { - set_abort_result(TOI_CPU_HOTPLUG_FAILED); - toi_end_atomic(ATOMIC_STEP_CPU_HOTPLUG, - suspend_time, 1); - return 1; - } - - local_irq_disable(); - - if (syscore_suspend()) { - set_abort_result(TOI_SYSCORE_REFUSED); - toi_end_atomic(ATOMIC_STEP_IRQS, suspend_time, 1); - return 1; - } - - if (suspend_time && pm_wakeup_pending()) { - set_abort_result(TOI_WAKEUP_EVENT); - toi_end_atomic(ATOMIC_STEP_SYSCORE_RESUME, suspend_time, 1); - return 1; - } - return 0; -} - -/** - * toi_end_atomic - post atomic copy/restore routines - * @stage: What step to start at. - * @suspend_time: Whether we're suspending or resuming. - * @error: Whether we're recovering from an error. - **/ -void toi_end_atomic(int stage, int suspend_time, int error) -{ - pm_message_t msg = suspend_time ? (error ? PMSG_RECOVER : PMSG_THAW) : - PMSG_RESTORE; - - switch (stage) { - case ATOMIC_ALL_STEPS: - if (!suspend_time) { - events_check_enabled = false; - } - platform_leave(1); - case ATOMIC_STEP_SYSCORE_RESUME: - syscore_resume(); - case ATOMIC_STEP_IRQS: - local_irq_enable(); - case ATOMIC_STEP_CPU_HOTPLUG: - enable_nonboot_cpus(); - case ATOMIC_STEP_PLATFORM_FINISH: - if (!suspend_time && error & 2) - platform_restore_cleanup(1); - else - platform_finish(1); - dpm_resume_start(msg); - case ATOMIC_STEP_DEVICE_RESUME: - if (suspend_time && (error & 2)) - platform_recover(1); - dpm_resume(msg); - if (!toi_in_suspend()) { - dpm_resume_end(PMSG_RECOVER); - } - if (error || !toi_in_suspend()) { - pm_restore_gfp_mask(); - } - resume_console(); - case ATOMIC_STEP_DPM_COMPLETE: - dpm_complete(msg); - case ATOMIC_STEP_PLATFORM_END: - platform_end(1); - - toi_prepare_status(DONT_CLEAR_BAR, "Post atomic."); - } -} |