cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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appldata_mem.c (4061B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Data gathering module for Linux-VM Monitor Stream, Stage 1.
      4 * Collects data related to memory management.
      5 *
      6 * Copyright IBM Corp. 2003, 2006
      7 *
      8 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com>
      9 */
     10
     11#include <linux/module.h>
     12#include <linux/init.h>
     13#include <linux/errno.h>
     14#include <linux/kernel_stat.h>
     15#include <linux/pagemap.h>
     16#include <linux/swap.h>
     17#include <linux/slab.h>
     18#include <asm/io.h>
     19
     20#include "appldata.h"
     21
     22
     23#define P2K(x) ((x) << (PAGE_SHIFT - 10))	/* Converts #Pages to KB */
     24
     25/*
     26 * Memory data
     27 *
     28 * This is accessed as binary data by z/VM. If changes to it can't be avoided,
     29 * the structure version (product ID, see appldata_base.c) needs to be changed
     30 * as well and all documentation and z/VM applications using it must be
     31 * updated.
     32 */
     33struct appldata_mem_data {
     34	u64 timestamp;
     35	u32 sync_count_1;       /* after VM collected the record data, */
     36	u32 sync_count_2;	/* sync_count_1 and sync_count_2 should be the
     37				   same. If not, the record has been updated on
     38				   the Linux side while VM was collecting the
     39				   (possibly corrupt) data */
     40
     41	u64 pgpgin;		/* data read from disk  */
     42	u64 pgpgout;		/* data written to disk */
     43	u64 pswpin;		/* pages swapped in  */
     44	u64 pswpout;		/* pages swapped out */
     45
     46	u64 sharedram;		/* sharedram is currently set to 0 */
     47
     48	u64 totalram;		/* total main memory size */
     49	u64 freeram;		/* free main memory size  */
     50	u64 totalhigh;		/* total high memory size */
     51	u64 freehigh;		/* free high memory size  */
     52
     53	u64 bufferram;		/* memory reserved for buffers, free cache */
     54	u64 cached;		/* size of (used) cache, w/o buffers */
     55	u64 totalswap;		/* total swap space size */
     56	u64 freeswap;		/* free swap space */
     57
     58// New in 2.6 -->
     59	u64 pgalloc;		/* page allocations */
     60	u64 pgfault;		/* page faults (major+minor) */
     61	u64 pgmajfault;		/* page faults (major only) */
     62// <-- New in 2.6
     63
     64} __packed;
     65
     66
     67/*
     68 * appldata_get_mem_data()
     69 *
     70 * gather memory data
     71 */
     72static void appldata_get_mem_data(void *data)
     73{
     74	/*
     75	 * don't put large structures on the stack, we are
     76	 * serialized through the appldata_ops_mutex and can use static
     77	 */
     78	static struct sysinfo val;
     79	unsigned long ev[NR_VM_EVENT_ITEMS];
     80	struct appldata_mem_data *mem_data;
     81
     82	mem_data = data;
     83	mem_data->sync_count_1++;
     84
     85	all_vm_events(ev);
     86	mem_data->pgpgin     = ev[PGPGIN] >> 1;
     87	mem_data->pgpgout    = ev[PGPGOUT] >> 1;
     88	mem_data->pswpin     = ev[PSWPIN];
     89	mem_data->pswpout    = ev[PSWPOUT];
     90	mem_data->pgalloc    = ev[PGALLOC_NORMAL];
     91	mem_data->pgalloc    += ev[PGALLOC_DMA];
     92	mem_data->pgfault    = ev[PGFAULT];
     93	mem_data->pgmajfault = ev[PGMAJFAULT];
     94
     95	si_meminfo(&val);
     96	mem_data->sharedram = val.sharedram;
     97	mem_data->totalram  = P2K(val.totalram);
     98	mem_data->freeram   = P2K(val.freeram);
     99	mem_data->totalhigh = P2K(val.totalhigh);
    100	mem_data->freehigh  = P2K(val.freehigh);
    101	mem_data->bufferram = P2K(val.bufferram);
    102	mem_data->cached    = P2K(global_node_page_state(NR_FILE_PAGES)
    103				- val.bufferram);
    104
    105	si_swapinfo(&val);
    106	mem_data->totalswap = P2K(val.totalswap);
    107	mem_data->freeswap  = P2K(val.freeswap);
    108
    109	mem_data->timestamp = get_tod_clock();
    110	mem_data->sync_count_2++;
    111}
    112
    113
    114static struct appldata_ops ops = {
    115	.name      = "mem",
    116	.record_nr = APPLDATA_RECORD_MEM_ID,
    117	.size	   = sizeof(struct appldata_mem_data),
    118	.callback  = &appldata_get_mem_data,
    119	.owner     = THIS_MODULE,
    120	.mod_lvl   = {0xF0, 0xF0},		/* EBCDIC "00" */
    121};
    122
    123
    124/*
    125 * appldata_mem_init()
    126 *
    127 * init_data, register ops
    128 */
    129static int __init appldata_mem_init(void)
    130{
    131	int ret;
    132
    133	ops.data = kzalloc(sizeof(struct appldata_mem_data), GFP_KERNEL);
    134	if (!ops.data)
    135		return -ENOMEM;
    136
    137	ret = appldata_register_ops(&ops);
    138	if (ret)
    139		kfree(ops.data);
    140
    141	return ret;
    142}
    143
    144/*
    145 * appldata_mem_exit()
    146 *
    147 * unregister ops
    148 */
    149static void __exit appldata_mem_exit(void)
    150{
    151	appldata_unregister_ops(&ops);
    152	kfree(ops.data);
    153}
    154
    155
    156module_init(appldata_mem_init);
    157module_exit(appldata_mem_exit);
    158
    159MODULE_LICENSE("GPL");
    160MODULE_AUTHOR("Gerald Schaefer");
    161MODULE_DESCRIPTION("Linux-VM Monitor Stream, MEMORY statistics");