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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /kernel/power/tuxonice_checksum.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'kernel/power/tuxonice_checksum.c')
-rw-r--r--kernel/power/tuxonice_checksum.c392
1 files changed, 0 insertions, 392 deletions
diff --git a/kernel/power/tuxonice_checksum.c b/kernel/power/tuxonice_checksum.c
deleted file mode 100644
index 1c4e10c72..000000000
--- a/kernel/power/tuxonice_checksum.c
+++ /dev/null
@@ -1,392 +0,0 @@
-/*
- * kernel/power/tuxonice_checksum.c
- *
- * Copyright (C) 2006-2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * This file is released under the GPLv2.
- *
- * This file contains data checksum routines for TuxOnIce,
- * using cryptoapi. They are used to locate any modifications
- * made to pageset 2 while we're saving it.
- */
-
-#include <linux/suspend.h>
-#include <linux/highmem.h>
-#include <linux/vmalloc.h>
-#include <linux/crypto.h>
-#include <linux/scatterlist.h>
-
-#include "tuxonice.h"
-#include "tuxonice_modules.h"
-#include "tuxonice_sysfs.h"
-#include "tuxonice_io.h"
-#include "tuxonice_pageflags.h"
-#include "tuxonice_checksum.h"
-#include "tuxonice_pagedir.h"
-#include "tuxonice_alloc.h"
-#include "tuxonice_ui.h"
-
-static struct toi_module_ops toi_checksum_ops;
-
-/* Constant at the mo, but I might allow tuning later */
-static char toi_checksum_name[32] = "md4";
-/* Bytes per checksum */
-#define CHECKSUM_SIZE (16)
-
-#define CHECKSUMS_PER_PAGE ((PAGE_SIZE - sizeof(void *)) / CHECKSUM_SIZE)
-
-struct cpu_context {
- struct crypto_hash *transform;
- struct hash_desc desc;
- struct scatterlist sg[2];
- char *buf;
-};
-
-static DEFINE_PER_CPU(struct cpu_context, contexts);
-static int pages_allocated;
-static unsigned long page_list;
-
-static int toi_num_resaved;
-
-static unsigned long this_checksum, next_page;
-static int checksum_count;
-
-static inline int checksum_pages_needed(void)
-{
- return DIV_ROUND_UP(pagedir2.size, CHECKSUMS_PER_PAGE);
-}
-
-/* ---- Local buffer management ---- */
-
-/*
- * toi_checksum_cleanup
- *
- * Frees memory allocated for our labours.
- */
-static void toi_checksum_cleanup(int ending_cycle)
-{
- int cpu;
-
- if (ending_cycle) {
- for_each_online_cpu(cpu) {
- struct cpu_context *this = &per_cpu(contexts, cpu);
- if (this->transform) {
- crypto_free_hash(this->transform);
- this->transform = NULL;
- this->desc.tfm = NULL;
- }
-
- if (this->buf) {
- toi_free_page(27, (unsigned long) this->buf);
- this->buf = NULL;
- }
- }
- }
-}
-
-/*
- * toi_crypto_initialise
- *
- * Prepare to do some work by allocating buffers and transforms.
- * Returns: Int: Zero. Even if we can't set up checksum, we still
- * seek to hibernate.
- */
-static int toi_checksum_initialise(int starting_cycle)
-{
- int cpu;
-
- if (!(starting_cycle & SYSFS_HIBERNATE) || !toi_checksum_ops.enabled)
- return 0;
-
- if (!*toi_checksum_name) {
- printk(KERN_INFO "TuxOnIce: No checksum algorithm name set.\n");
- return 1;
- }
-
- for_each_online_cpu(cpu) {
- struct cpu_context *this = &per_cpu(contexts, cpu);
- struct page *page;
-
- this->transform = crypto_alloc_hash(toi_checksum_name, 0, 0);
- if (IS_ERR(this->transform)) {
- printk(KERN_INFO "TuxOnIce: Failed to initialise the "
- "%s checksum algorithm: %ld.\n",
- toi_checksum_name, (long) this->transform);
- this->transform = NULL;
- return 1;
- }
-
- this->desc.tfm = this->transform;
- this->desc.flags = 0;
-
- page = toi_alloc_page(27, GFP_KERNEL);
- if (!page)
- return 1;
- this->buf = page_address(page);
- sg_init_one(&this->sg[0], this->buf, PAGE_SIZE);
- }
- return 0;
-}
-
-/*
- * toi_checksum_print_debug_stats
- * @buffer: Pointer to a buffer into which the debug info will be printed.
- * @size: Size of the buffer.
- *
- * Print information to be recorded for debugging purposes into a buffer.
- * Returns: Number of characters written to the buffer.
- */
-
-static int toi_checksum_print_debug_stats(char *buffer, int size)
-{
- int len;
-
- if (!toi_checksum_ops.enabled)
- return scnprintf(buffer, size,
- "- Checksumming disabled.\n");
-
- len = scnprintf(buffer, size, "- Checksum method is '%s'.\n",
- toi_checksum_name);
- len += scnprintf(buffer + len, size - len,
- " %d pages resaved in atomic copy.\n", toi_num_resaved);
- return len;
-}
-
-static int toi_checksum_memory_needed(void)
-{
- return toi_checksum_ops.enabled ?
- checksum_pages_needed() << PAGE_SHIFT : 0;
-}
-
-static int toi_checksum_storage_needed(void)
-{
- if (toi_checksum_ops.enabled)
- return strlen(toi_checksum_name) + sizeof(int) + 1;
- else
- return 0;
-}
-
-/*
- * toi_checksum_save_config_info
- * @buffer: Pointer to a buffer of size PAGE_SIZE.
- *
- * Save informaton needed when reloading the image at resume time.
- * Returns: Number of bytes used for saving our data.
- */
-static int toi_checksum_save_config_info(char *buffer)
-{
- int namelen = strlen(toi_checksum_name) + 1;
- int total_len;
-
- *((unsigned int *) buffer) = namelen;
- strncpy(buffer + sizeof(unsigned int), toi_checksum_name, namelen);
- total_len = sizeof(unsigned int) + namelen;
- return total_len;
-}
-
-/* toi_checksum_load_config_info
- * @buffer: Pointer to the start of the data.
- * @size: Number of bytes that were saved.
- *
- * Description: Reload information needed for dechecksuming the image at
- * resume time.
- */
-static void toi_checksum_load_config_info(char *buffer, int size)
-{
- int namelen;
-
- namelen = *((unsigned int *) (buffer));
- strncpy(toi_checksum_name, buffer + sizeof(unsigned int),
- namelen);
- return;
-}
-
-/*
- * Free Checksum Memory
- */
-
-void free_checksum_pages(void)
-{
- while (pages_allocated) {
- unsigned long next = *((unsigned long *) page_list);
- ClearPageNosave(virt_to_page(page_list));
- toi_free_page(15, (unsigned long) page_list);
- page_list = next;
- pages_allocated--;
- }
-}
-
-/*
- * Allocate Checksum Memory
- */
-
-int allocate_checksum_pages(void)
-{
- int pages_needed = checksum_pages_needed();
-
- if (!toi_checksum_ops.enabled)
- return 0;
-
- while (pages_allocated < pages_needed) {
- unsigned long *new_page =
- (unsigned long *) toi_get_zeroed_page(15, TOI_ATOMIC_GFP);
- if (!new_page) {
- printk(KERN_ERR "Unable to allocate checksum pages.\n");
- return -ENOMEM;
- }
- SetPageNosave(virt_to_page(new_page));
- (*new_page) = page_list;
- page_list = (unsigned long) new_page;
- pages_allocated++;
- }
-
- next_page = (unsigned long) page_list;
- checksum_count = 0;
-
- return 0;
-}
-
-char *tuxonice_get_next_checksum(void)
-{
- if (!toi_checksum_ops.enabled)
- return NULL;
-
- if (checksum_count % CHECKSUMS_PER_PAGE)
- this_checksum += CHECKSUM_SIZE;
- else {
- this_checksum = next_page + sizeof(void *);
- next_page = *((unsigned long *) next_page);
- }
-
- checksum_count++;
- return (char *) this_checksum;
-}
-
-int tuxonice_calc_checksum(struct page *page, char *checksum_locn)
-{
- char *pa;
- int result, cpu = smp_processor_id();
- struct cpu_context *ctx = &per_cpu(contexts, cpu);
-
- if (!toi_checksum_ops.enabled)
- return 0;
-
- pa = kmap(page);
- memcpy(ctx->buf, pa, PAGE_SIZE);
- kunmap(page);
- result = crypto_hash_digest(&ctx->desc, ctx->sg, PAGE_SIZE,
- checksum_locn);
- if (result)
- printk(KERN_ERR "TuxOnIce checksumming: crypto_hash_digest "
- "returned %d.\n", result);
- return result;
-}
-/*
- * Calculate checksums
- */
-
-void check_checksums(void)
-{
- int index = 0, cpu = smp_processor_id();
- char current_checksum[CHECKSUM_SIZE];
- struct cpu_context *ctx = &per_cpu(contexts, cpu);
- unsigned long pfn;
-
- if (!toi_checksum_ops.enabled) {
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Checksumming disabled.");
- return;
- }
-
- next_page = (unsigned long) page_list;
-
- toi_num_resaved = 0;
- this_checksum = 0;
-
- toi_trace_index++;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Verifying checksums.");
- memory_bm_position_reset(pageset2_map);
- for (pfn = memory_bm_next_pfn(pageset2_map, 0); pfn != BM_END_OF_MAP;
- pfn = memory_bm_next_pfn(pageset2_map, 0)) {
- int ret, resave_needed = false;
- char *pa;
- struct page *page = pfn_to_page(pfn);
-
- if (index < checksum_count) {
- if (index % CHECKSUMS_PER_PAGE) {
- this_checksum += CHECKSUM_SIZE;
- } else {
- this_checksum = next_page + sizeof(void *);
- next_page = *((unsigned long *) next_page);
- }
-
- /* Done when IRQs disabled so must be atomic */
- pa = kmap_atomic(page);
- memcpy(ctx->buf, pa, PAGE_SIZE);
- kunmap_atomic(pa);
- ret = crypto_hash_digest(&ctx->desc, ctx->sg, PAGE_SIZE,
- current_checksum);
-
- if (ret) {
- printk(KERN_INFO "Digest failed. Returned %d.\n", ret);
- return;
- }
-
- resave_needed = memcmp(current_checksum, (char *) this_checksum,
- CHECKSUM_SIZE);
- } else {
- resave_needed = true;
- }
-
- if (resave_needed) {
- TOI_TRACE_DEBUG(pfn, "_Resaving %d", resave_needed);
- SetPageResave(pfn_to_page(pfn));
- toi_num_resaved++;
- if (test_action_state(TOI_ABORT_ON_RESAVE_NEEDED))
- set_abort_result(TOI_RESAVE_NEEDED);
- }
-
- index++;
- }
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Checksum verification complete.");
-}
-
-static struct toi_sysfs_data sysfs_params[] = {
- SYSFS_INT("enabled", SYSFS_RW, &toi_checksum_ops.enabled, 0, 1, 0,
- NULL),
- SYSFS_BIT("abort_if_resave_needed", SYSFS_RW, &toi_bkd.toi_action,
- TOI_ABORT_ON_RESAVE_NEEDED, 0)
-};
-
-/*
- * Ops structure.
- */
-static struct toi_module_ops toi_checksum_ops = {
- .type = MISC_MODULE,
- .name = "checksumming",
- .directory = "checksum",
- .module = THIS_MODULE,
- .initialise = toi_checksum_initialise,
- .cleanup = toi_checksum_cleanup,
- .print_debug_info = toi_checksum_print_debug_stats,
- .save_config_info = toi_checksum_save_config_info,
- .load_config_info = toi_checksum_load_config_info,
- .memory_needed = toi_checksum_memory_needed,
- .storage_needed = toi_checksum_storage_needed,
-
- .sysfs_data = sysfs_params,
- .num_sysfs_entries = sizeof(sysfs_params) /
- sizeof(struct toi_sysfs_data),
-};
-
-/* ---- Registration ---- */
-int toi_checksum_init(void)
-{
- int result = toi_register_module(&toi_checksum_ops);
- return result;
-}
-
-void toi_checksum_exit(void)
-{
- toi_unregister_module(&toi_checksum_ops);
-}