Linux-libre 4.2-gnu

1 files changed, 0 insertions, 402 deletions

diff --git a/kernel/power/tuxonice_incremental.c b/kernel/power/tuxonice_incremental.c
deleted file mode 100644
index c5a09789e..000000000
--- a/kernel/power/tuxonice_incremental.c
+++ /dev/null
@@ -1,402 +0,0 @@
-/*
- * kernel/power/tuxonice_incremental.c
- *
- * Copyright (C) 2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * This file is released under the GPLv2.
- *
- * This file contains routines related to storing incremental images - that
- * is, retaining an image after an initial cycle and then storing incremental
- * changes on subsequent hibernations.
- *
- * Based in part on on...
- *
- * Debug helper to dump the current kernel pagetables of the system
- * so that we can see what the various memory ranges are set to.
- *
- * (C) Copyright 2008 Intel Corporation
- *
- * Author: Arjan van de Ven <arjan@linux.intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <linux/mm.h>
-#include <linux/tuxonice.h>
-#include <linux/sched.h>
-#include <asm/pgtable.h>
-#include <asm/cacheflush.h>
-#include <asm/tlbflush.h>
-#include <asm/page.h>
-#include "tuxonice_pageflags.h"
-#include "tuxonice_builtin.h"
-#include "power.h"
-
-int toi_do_incremental_initcall;
-
-extern void kdb_init(int level);
-extern noinline void kgdb_breakpoint(void);
-
-#undef pr_debug
-#if 0
-#define pr_debug(a, b...) do { printk(a, ##b); } while(0)
-#else
-#define pr_debug(a, b...) do { } while(0)
-#endif
-
-/* Multipliers for offsets within the PTEs */
-#define PTE_LEVEL_MULT (PAGE_SIZE)
-#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
-#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
-#define PGD_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
-
-/*
- * This function gets called on a break in a continuous series
- * of PTE entries; the next one is different so we need to
- * print what we collected so far.
- */
-static void note_page(void *addr)
-{
-    static struct page *lastpage;
-    struct page *page;
-
-    page = virt_to_page(addr);
-
-    if (page != lastpage) {
-        unsigned int level;
-        pte_t *pte = lookup_address((unsigned long) addr, &level);
-        struct page *pt_page2 = pte_page(*pte);
-        //debug("Note page %p (=> %p => %p|%ld).\n", addr, pte, pt_page2, page_to_pfn(pt_page2));
-        SetPageTOI_Untracked(pt_page2);
-        lastpage = page;
-    }
-}
-
-static void walk_pte_level(pmd_t addr)
-{
-	int i;
-	pte_t *start;
-
-	start = (pte_t *) pmd_page_vaddr(addr);
-	for (i = 0; i < PTRS_PER_PTE; i++) {
-		note_page(start);
-		start++;
-	}
-}
-
-#if PTRS_PER_PMD > 1
-
-static void walk_pmd_level(pud_t addr)
-{
-	int i;
-	pmd_t *start;
-
-	start = (pmd_t *) pud_page_vaddr(addr);
-	for (i = 0; i < PTRS_PER_PMD; i++) {
-		if (!pmd_none(*start)) {
-			if (pmd_large(*start) || !pmd_present(*start))
-				note_page(start);
-			else
-				walk_pte_level(*start);
-		} else
-			note_page(start);
-		start++;
-	}
-}
-
-#else
-#define walk_pmd_level(a) walk_pte_level(__pmd(pud_val(a)))
-#define pud_large(a) pmd_large(__pmd(pud_val(a)))
-#define pud_none(a)  pmd_none(__pmd(pud_val(a)))
-#endif
-
-#if PTRS_PER_PUD > 1
-
-static void walk_pud_level(pgd_t addr)
-{
-	int i;
-	pud_t *start;
-
-	start = (pud_t *) pgd_page_vaddr(addr);
-
-	for (i = 0; i < PTRS_PER_PUD; i++) {
-		if (!pud_none(*start)) {
-			if (pud_large(*start) || !pud_present(*start))
-				note_page(start);
-			else
-				walk_pmd_level(*start);
-		} else
-			note_page(start);
-
-		start++;
-	}
-}
-
-#else
-#define walk_pud_level(a) walk_pmd_level(__pud(pgd_val(a)))
-#define pgd_large(a) pud_large(__pud(pgd_val(a)))
-#define pgd_none(a)  pud_none(__pud(pgd_val(a)))
-#endif
-
-/*
- * Not static in the original at the time of writing, so needs renaming here.
- */
-static void toi_ptdump_walk_pgd_level(pgd_t *pgd)
-{
-#ifdef CONFIG_X86_64
-	pgd_t *start = (pgd_t *) &init_level4_pgt;
-#else
-	pgd_t *start = swapper_pg_dir;
-#endif
-	int i;
-	if (pgd) {
-		start = pgd;
-	}
-
-	for (i = 0; i < PTRS_PER_PGD; i++) {
-		if (!pgd_none(*start)) {
-			if (pgd_large(*start) || !pgd_present(*start))
-				note_page(start);
-			else
-				walk_pud_level(*start);
-		} else
-			note_page(start);
-
-		start++;
-	}
-
-	/* Flush out the last page */
-	note_page(start);
-}
-
-#ifdef CONFIG_PARAVIRT
-extern struct pv_info pv_info;
-
-static void toi_set_paravirt_ops_untracked(void) {
-    int i;
-
-    unsigned long pvpfn = page_to_pfn(virt_to_page(__parainstructions)),
-                  pvpfn_end = page_to_pfn(virt_to_page(__parainstructions_end));
-    //debug(KERN_EMERG ".parainstructions goes from pfn %ld to %ld.\n", pvpfn, pvpfn_end);
-    for (i = pvpfn; i <= pvpfn_end; i++) {
-        SetPageTOI_Untracked(pfn_to_page(i));
-    }
-}
-#else
-#define toi_set_paravirt_ops_untracked() { do { } while(0) }
-#endif
-
-extern void toi_mark_per_cpus_pages_untracked(void);
-
-void toi_untrack_stack(unsigned long *stack)
-{
-    int i;
-    struct page *stack_page = virt_to_page(stack);
-
-    for (i = 0; i < (1 << THREAD_SIZE_ORDER); i++) {
-        pr_debug("Untrack stack page %p.\n", page_address(stack_page + i));
-        SetPageTOI_Untracked(stack_page + i);
-    }
-}
-void toi_untrack_process(struct task_struct *p)
-{
-    SetPageTOI_Untracked(virt_to_page(p));
-    pr_debug("Untrack process %d page %p.\n", p->pid, page_address(virt_to_page(p)));
-
-    toi_untrack_stack(p->stack);
-}
-
-void toi_generate_untracked_map(void)
-{
-    struct task_struct *p, *t;
-    struct page *page;
-    pte_t *pte;
-    int i;
-    unsigned int level;
-    static int been_here = 0;
-
-    if (been_here)
-        return;
-
-    been_here = 1;
-
-    /* Pagetable pages */
-    toi_ptdump_walk_pgd_level(NULL);
-
-    /* Printk buffer - not normally needed but can be helpful for debugging. */
-    //toi_set_logbuf_untracked();
-
-    /* Paravirt ops */
-    toi_set_paravirt_ops_untracked();
-
-    /* Task structs and stacks */
-    for_each_process_thread(p, t) {
-        toi_untrack_process(p);
-        //toi_untrack_stack((unsigned long *) t->thread.sp);
-    }
-
-    for (i = 0; i < NR_CPUS; i++) {
-        struct task_struct *idle = idle_task(i);
-
-        if (idle) {
-            pr_debug("Untrack idle process for CPU %d.\n", i);
-            toi_untrack_process(idle);
-        }
-
-        /* IRQ stack */
-        pr_debug("Untrack IRQ stack for CPU %d.\n", i);
-        toi_untrack_stack((unsigned long *)per_cpu(irq_stack_ptr, i));
-    }
-
-    /* Per CPU data */
-    //pr_debug("Untracking per CPU variable pages.\n");
-    toi_mark_per_cpus_pages_untracked();
-
-    /* Init stack - for bringing up secondary CPUs */
-    page = virt_to_page(init_stack);
-    for (i = 0; i < DIV_ROUND_UP(sizeof(init_stack), PAGE_SIZE); i++) {
-        SetPageTOI_Untracked(page + i);
-    }
-
-    pte = lookup_address((unsigned long) &mmu_cr4_features, &level);
-    SetPageTOI_Untracked(pte_page(*pte));
-    SetPageTOI_Untracked(virt_to_page(trampoline_cr4_features));
-}
-
-/**
- * toi_reset_dirtiness_one
- */
-
-void toi_reset_dirtiness_one(unsigned long pfn, int verbose)
-{
-    struct page *page = pfn_to_page(pfn);
-
-    /**
-     * Don't worry about whether the Dirty flag is
-     * already set. If this is our first call, it
-     * won't be.
-     */
-
-    preempt_disable();
-
-    ClearPageTOI_Dirty(page);
-    SetPageTOI_RO(page);
-    if (verbose)
-        printk(KERN_EMERG "Making page %ld (%p|%p) read only.\n", pfn, page, page_address(page));
-
-    set_memory_ro((unsigned long) page_address(page), 1);
-
-    preempt_enable();
-}
-
-/**
- * TuxOnIce's incremental image support works by marking all memory apart from
- * the page tables read-only, then in the page-faults that result enabling
- * writing if appropriate and flagging the page as dirty. Free pages are also
- * marked as dirty and not protected so that if allocated, they will be included
- * in the image without further processing.
- *
- * toi_reset_dirtiness is called when and image exists and incremental images are
- * enabled, and each time we resume thereafter. It is not invoked on a fresh boot.
- *
- * This routine should be called from a single-cpu-running context to avoid races in setting
- * page dirty/read only flags.
- *
- * TODO: Make "it is not invoked on a fresh boot" true  when I've finished developing it!
- *
- * TODO: Consider Xen paravirt guest boot issues. See arch/x86/mm/pageattr.c.
- **/
-
-int toi_reset_dirtiness(int verbose)
-{
-	struct zone *zone;
-	unsigned long loop;
-        int allocated_map = 0;
-
-        toi_generate_untracked_map();
-
-        if (!free_map) {
-            if (!toi_alloc_bitmap(&free_map))
-                return -ENOMEM;
-            allocated_map = 1;
-        }
-
-	toi_generate_free_page_map();
-
-        pr_debug(KERN_EMERG "Reset dirtiness.\n");
-        for_each_populated_zone(zone) {
-            // 64 bit only. No need to worry about highmem.
-            for (loop = 0; loop < zone->spanned_pages; loop++) {
-                unsigned long pfn = zone->zone_start_pfn + loop;
-                struct page *page;
-                int chunk_size;
-
-                if (!pfn_valid(pfn)) {
-                    continue;
-                }
-
-                chunk_size = toi_size_of_free_region(zone, pfn);
-                if (chunk_size) {
-                    loop += chunk_size - 1;
-                    continue;
-                }
-
-                page = pfn_to_page(pfn);
-
-                if (PageNosave(page) || !saveable_page(zone, pfn)) {
-                    continue;
-                }
-
-                if (PageTOI_Untracked(page)) {
-                    continue;
-                }
-
-                /**
-                 * Do we need to (re)protect the page?
-                 * If it is already protected (PageTOI_RO), there is
-                 * nothing to do - skip the following.
-                 * If it is marked as dirty (PageTOI_Dirty), it was
-                 * either free and has been allocated or has been
-                 * written to and marked dirty. Reset the dirty flag
-                 * and (re)apply the protection.
-                 */
-                if (!PageTOI_RO(page)) {
-                    toi_reset_dirtiness_one(pfn, verbose);
-                }
-            }
-        }
-
-        pr_debug(KERN_EMERG "Done resetting dirtiness.\n");
-
-        if (allocated_map) {
-            toi_free_bitmap(&free_map);
-        }
-        return 0;
-}
-
-static int toi_reset_dirtiness_initcall(void)
-{
-    if (toi_do_incremental_initcall) {
-        pr_info("TuxOnIce: Enabling dirty page tracking.\n");
-        toi_reset_dirtiness(0);
-    }
-    return 1;
-}
-extern void toi_generate_untracked_map(void);
-
-// Leave early_initcall for pages to register untracked sections.
-early_initcall(toi_reset_dirtiness_initcall);
-
-static int __init toi_incremental_initcall_setup(char *str)
-{
-	int value;
-
-	if (sscanf(str, "=%d", &value) && value)
-		toi_do_incremental_initcall = value;
-
-	return 1;
-}
-__setup("toi_incremental_initcall", toi_incremental_initcall_setup);