Linux-libre 4.5-gnu

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);
-}