Linux-libre 4.5-gnu

1 files changed, 0 insertions, 406 deletions

diff --git a/kernel/power/tuxonice_prune.c b/kernel/power/tuxonice_prune.c
deleted file mode 100644
index 5bc56d3a1..000000000
--- a/kernel/power/tuxonice_prune.c
+++ /dev/null
@@ -1,406 +0,0 @@
-/*
- * kernel/power/tuxonice_prune.c
- *
- * Copyright (C) 2012 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * This file is released under the GPLv2.
- *
- * This file implements a TuxOnIce module that seeks to prune the
- * amount of data written to disk. It builds a table of hashes
- * of the uncompressed data, and writes the pfn of the previous page
- * with the same contents instead of repeating the data when a match
- * is found.
- */
-
-#include <linux/suspend.h>
-#include <linux/highmem.h>
-#include <linux/vmalloc.h>
-#include <linux/crypto.h>
-#include <linux/scatterlist.h>
-#include <crypto/hash.h>
-
-#include "tuxonice_builtin.h"
-#include "tuxonice.h"
-#include "tuxonice_modules.h"
-#include "tuxonice_sysfs.h"
-#include "tuxonice_io.h"
-#include "tuxonice_ui.h"
-#include "tuxonice_alloc.h"
-
-/*
- * We never write a page bigger than PAGE_SIZE, so use a large number
- * to indicate that data is a PFN.
- */
-#define PRUNE_DATA_IS_PFN (PAGE_SIZE + 100)
-
-static unsigned long toi_pruned_pages;
-
-static struct toi_module_ops toi_prune_ops;
-static struct toi_module_ops *next_driver;
-
-static char toi_prune_hash_algo_name[32] = "sha1";
-
-static DEFINE_MUTEX(stats_lock);
-
-struct cpu_context {
-        struct shash_desc desc;
-        char *digest;
-};
-
-#define OUT_BUF_SIZE (2 * PAGE_SIZE)
-
-static DEFINE_PER_CPU(struct cpu_context, contexts);
-
-/*
- * toi_crypto_prepare
- *
- * Prepare to do some work by allocating buffers and transforms.
- */
-static int toi_prune_crypto_prepare(void)
-{
-        int cpu, ret, digestsize;
-
-        if (!*toi_prune_hash_algo_name) {
-                printk(KERN_INFO "TuxOnIce: Pruning enabled but no "
-                                "hash algorithm set.\n");
-                return 1;
-        }
-
-        for_each_online_cpu(cpu) {
-                struct cpu_context *this = &per_cpu(contexts, cpu);
-                this->desc.tfm = crypto_alloc_shash(toi_prune_hash_algo_name, 0, 0);
-                if (IS_ERR(this->desc.tfm)) {
-                        printk(KERN_INFO "TuxOnIce: Failed to allocate the "
-                                        "%s prune hash algorithm.\n",
-                                        toi_prune_hash_algo_name);
-                        this->desc.tfm = NULL;
-                        return 1;
-                }
-
-                if (!digestsize)
-                        digestsize = crypto_shash_digestsize(this->desc.tfm);
-
-                this->digest = kmalloc(digestsize, GFP_KERNEL);
-                if (!this->digest) {
-                        printk(KERN_INFO "TuxOnIce: Failed to allocate space "
-                                        "for digest output.\n");
-                        crypto_free_shash(this->desc.tfm);
-                        this->desc.tfm = NULL;
-                }
-
-                this->desc.flags = 0;
-
-                ret = crypto_shash_init(&this->desc);
-                if (ret < 0) {
-                        printk(KERN_INFO "TuxOnIce: Failed to initialise the "
-                                        "%s prune hash algorithm.\n",
-                                        toi_prune_hash_algo_name);
-                        kfree(this->digest);
-                        this->digest = NULL;
-                        crypto_free_shash(this->desc.tfm);
-                        this->desc.tfm = NULL;
-                        return 1;
-                }
-        }
-
-        return 0;
-}
-
-static int toi_prune_rw_cleanup(int writing)
-{
-        int cpu;
-
-        for_each_online_cpu(cpu) {
-                struct cpu_context *this = &per_cpu(contexts, cpu);
-                if (this->desc.tfm) {
-                        crypto_free_shash(this->desc.tfm);
-                        this->desc.tfm = NULL;
-                }
-
-                if (this->digest) {
-                        kfree(this->digest);
-                        this->digest = NULL;
-                }
-        }
-
-        return 0;
-}
-
-/*
- * toi_prune_init
- */
-
-static int toi_prune_init(int toi_or_resume)
-{
-        if (!toi_or_resume)
-                return 0;
-
-        toi_pruned_pages = 0;
-
-        next_driver = toi_get_next_filter(&toi_prune_ops);
-
-        return next_driver ? 0 : -ECHILD;
-}
-
-/*
- * toi_prune_rw_init()
- */
-
-static int toi_prune_rw_init(int rw, int stream_number)
-{
-        if (toi_prune_crypto_prepare()) {
-                printk(KERN_ERR "Failed to initialise prune "
-                                "algorithm.\n");
-                if (rw == READ) {
-                        printk(KERN_INFO "Unable to read the image.\n");
-                        return -ENODEV;
-                } else {
-                        printk(KERN_INFO "Continuing without "
-                                "pruning the image.\n");
-                        toi_prune_ops.enabled = 0;
-                }
-        }
-
-        return 0;
-}
-
-/*
- * toi_prune_write_page()
- *
- * Compress a page of data, buffering output and passing on filled
- * pages to the next module in the pipeline.
- *
- * Buffer_page:        Pointer to a buffer of size PAGE_SIZE, containing
- * data to be checked.
- *
- * Returns:        0 on success. Otherwise the error is that returned by later
- *                 modules, -ECHILD if we have a broken pipeline or -EIO if
- *                 zlib errs.
- */
-static int toi_prune_write_page(unsigned long index, int buf_type,
-                void *buffer_page, unsigned int buf_size)
-{
-        int ret = 0, cpu = smp_processor_id(), write_data = 1;
-        struct cpu_context *ctx = &per_cpu(contexts, cpu);
-        u8* output_buffer = buffer_page;
-        int output_len = buf_size;
-        int out_buf_type = buf_type;
-        void *buffer_start;
-        u32 buf[4];
-
-        if (ctx->desc.tfm) {
-
-                buffer_start = TOI_MAP(buf_type, buffer_page);
-                ctx->len = OUT_BUF_SIZE;
-
-                ret = crypto_shash_digest(&ctx->desc, buffer_start, buf_size, &ctx->digest);
-                if (ret) {
-                        printk(KERN_INFO "TuxOnIce: Failed to calculate digest (%d).\n", ret);
-                } else {
-                        mutex_lock(&stats_lock);
-
-                        toi_pruned_pages++;
-
-                        mutex_unlock(&stats_lock);
-
-                }
-
-                TOI_UNMAP(buf_type, buffer_page);
-        }
-
-        if (write_data)
-                ret = next_driver->write_page(index, out_buf_type,
-                                output_buffer, output_len);
-        else
-                ret = next_driver->write_page(index, out_buf_type,
-                                output_buffer, output_len);
-
-        return ret;
-}
-
-/*
- * toi_prune_read_page()
- * @buffer_page: struct page *. Pointer to a buffer of size PAGE_SIZE.
- *
- * Retrieve data from later modules or from a previously loaded page and
- * fill the input buffer.
- * Zero if successful. Error condition from me or from downstream on failure.
- */
-static int toi_prune_read_page(unsigned long *index, int buf_type,
-                void *buffer_page, unsigned int *buf_size)
-{
-        int ret, cpu = smp_processor_id();
-        unsigned int len;
-        char *buffer_start;
-        struct cpu_context *ctx = &per_cpu(contexts, cpu);
-
-        if (!ctx->desc.tfm)
-                return next_driver->read_page(index, TOI_PAGE, buffer_page,
-                                buf_size);
-
-        /*
-         * All our reads must be synchronous - we can't handle
-         * data that hasn't been read yet.
-         */
-
-        ret = next_driver->read_page(index, buf_type, buffer_page, &len);
-
-        if (len == PRUNE_DATA_IS_PFN) {
-                buffer_start = kmap(buffer_page);
-        }
-
-        return ret;
-}
-
-/*
- * toi_prune_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_prune_print_debug_stats(char *buffer, int size)
-{
-        int len;
-
-        /* Output the number of pages pruned. */
-        if (*toi_prune_hash_algo_name)
-                len = scnprintf(buffer, size, "- Compressor is '%s'.\n",
-                                toi_prune_hash_algo_name);
-        else
-                len = scnprintf(buffer, size, "- Compressor is not set.\n");
-
-        if (toi_pruned_pages)
-                len += scnprintf(buffer+len, size - len, "  Pruned "
-                        "%lu pages).\n",
-                  toi_pruned_pages);
-        return len;
-}
-
-/*
- * toi_prune_memory_needed
- *
- * Tell the caller how much memory we need to operate during hibernate/resume.
- * Returns: Unsigned long. Maximum number of bytes of memory required for
- * operation.
- */
-static int toi_prune_memory_needed(void)
-{
-        return 2 * PAGE_SIZE;
-}
-
-static int toi_prune_storage_needed(void)
-{
-        return 2 * sizeof(unsigned long) + 2 * sizeof(int) +
-                strlen(toi_prune_hash_algo_name) + 1;
-}
-
-/*
- * toi_prune_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_prune_save_config_info(char *buffer)
-{
-        int len = strlen(toi_prune_hash_algo_name) + 1, offset = 0;
-
-        *((unsigned long *) buffer) = toi_pruned_pages;
-        offset += sizeof(unsigned long);
-        *((int *) (buffer + offset)) = len;
-        offset += sizeof(int);
-        strncpy(buffer + offset, toi_prune_hash_algo_name, len);
-        return offset + len;
-}
-
-/* toi_prune_load_config_info
- * @buffer: Pointer to the start of the data.
- * @size: Number of bytes that were saved.
- *
- * Description:        Reload information needed for passing back to the
- * resumed kernel.
- */
-static void toi_prune_load_config_info(char *buffer, int size)
-{
-        int len, offset = 0;
-
-        toi_pruned_pages = *((unsigned long *) buffer);
-        offset += sizeof(unsigned long);
-        len = *((int *) (buffer + offset));
-        offset += sizeof(int);
-        strncpy(toi_prune_hash_algo_name, buffer + offset, len);
-}
-
-static void toi_prune_pre_atomic_restore(struct toi_boot_kernel_data *bkd)
-{
-        bkd->pruned_pages = toi_pruned_pages;
-}
-
-static void toi_prune_post_atomic_restore(struct toi_boot_kernel_data *bkd)
-{
-        toi_pruned_pages = bkd->pruned_pages;
-}
-
-/*
- * toi_expected_ratio
- *
- * Description:        Returns the expected ratio between data passed into this module
- *                 and the amount of data output when writing.
- * Returns:        100 - we have no idea how many pages will be pruned.
- */
-
-static int toi_prune_expected_ratio(void)
-{
-        return 100;
-}
-
-/*
- * data for our sysfs entries.
- */
-static struct toi_sysfs_data sysfs_params[] = {
-        SYSFS_INT("enabled", SYSFS_RW, &toi_prune_ops.enabled, 0, 1, 0,
-                        NULL),
-        SYSFS_STRING("algorithm", SYSFS_RW, toi_prune_hash_algo_name, 31, 0, NULL),
-};
-
-/*
- * Ops structure.
- */
-static struct toi_module_ops toi_prune_ops = {
-        .type                        = FILTER_MODULE,
-        .name                        = "prune",
-        .directory                = "prune",
-        .module                        = THIS_MODULE,
-        .initialise                = toi_prune_init,
-        .memory_needed                 = toi_prune_memory_needed,
-        .print_debug_info        = toi_prune_print_debug_stats,
-        .save_config_info        = toi_prune_save_config_info,
-        .load_config_info        = toi_prune_load_config_info,
-        .storage_needed                = toi_prune_storage_needed,
-        .expected_compression        = toi_prune_expected_ratio,
-
-        .pre_atomic_restore        = toi_prune_pre_atomic_restore,
-        .post_atomic_restore        = toi_prune_post_atomic_restore,
-
-        .rw_init                = toi_prune_rw_init,
-        .rw_cleanup                = toi_prune_rw_cleanup,
-
-        .write_page                = toi_prune_write_page,
-        .read_page                = toi_prune_read_page,
-
-        .sysfs_data                = sysfs_params,
-        .num_sysfs_entries        = sizeof(sysfs_params) /
-                sizeof(struct toi_sysfs_data),
-};
-
-/* ---- Registration ---- */
-
-static __init int toi_prune_load(void)
-{
-        return toi_register_module(&toi_prune_ops);
-}
-
-late_initcall(toi_prune_load);