2017-11-24 14:00:32 +00:00
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// SPDX-License-Identifier: GPL-2.0
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2012-03-11 15:59:32 +00:00
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/*
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* Linux Guest Relocation (LGR) detection
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*
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* Copyright IBM Corp. 2012
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* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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2016-10-30 20:37:31 +00:00
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#include <linux/init.h>
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#include <linux/export.h>
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2012-03-11 15:59:32 +00:00
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#include <linux/timer.h>
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#include <linux/slab.h>
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2012-03-30 07:40:55 +00:00
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#include <asm/facility.h>
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2012-03-11 15:59:32 +00:00
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#include <asm/sysinfo.h>
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#include <asm/ebcdic.h>
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#include <asm/debug.h>
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#include <asm/ipl.h>
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#define LGR_TIMER_INTERVAL_SECS (30 * 60)
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#define VM_LEVEL_MAX 2 /* Maximum is 8, but we only record two levels */
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/*
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* LGR info: Contains stfle and stsi data
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*/
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struct lgr_info {
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/* Bit field with facility information: 4 DWORDs are stored */
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u64 stfle_fac_list[4];
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/* Level of system (1 = CEC, 2 = LPAR, 3 = z/VM */
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u32 level;
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/* Level 1: CEC info (stsi 1.1.1) */
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char manufacturer[16];
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char type[4];
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char sequence[16];
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char plant[4];
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char model[16];
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/* Level 2: LPAR info (stsi 2.2.2) */
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u16 lpar_number;
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char name[8];
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/* Level 3: VM info (stsi 3.2.2) */
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u8 vm_count;
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struct {
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char name[8];
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char cpi[16];
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} vm[VM_LEVEL_MAX];
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} __packed __aligned(8);
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/*
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* LGR globals
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*/
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2012-07-20 09:15:01 +00:00
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static char lgr_page[PAGE_SIZE] __aligned(PAGE_SIZE);
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2012-03-11 15:59:32 +00:00
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static struct lgr_info lgr_info_last;
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static struct lgr_info lgr_info_cur;
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static struct debug_info *lgr_dbf;
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/*
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* Copy buffer and then convert it to ASCII
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*/
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static void cpascii(char *dst, char *src, int size)
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{
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memcpy(dst, src, size);
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EBCASC(dst, size);
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}
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/*
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* Fill LGR info with 1.1.1 stsi data
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*/
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static void lgr_stsi_1_1_1(struct lgr_info *lgr_info)
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{
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2012-07-20 09:15:01 +00:00
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struct sysinfo_1_1_1 *si = (void *) lgr_page;
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2012-03-11 15:59:32 +00:00
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2012-09-06 12:42:13 +00:00
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if (stsi(si, 1, 1, 1))
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2012-03-11 15:59:32 +00:00
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return;
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cpascii(lgr_info->manufacturer, si->manufacturer,
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sizeof(si->manufacturer));
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cpascii(lgr_info->type, si->type, sizeof(si->type));
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cpascii(lgr_info->model, si->model, sizeof(si->model));
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cpascii(lgr_info->sequence, si->sequence, sizeof(si->sequence));
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cpascii(lgr_info->plant, si->plant, sizeof(si->plant));
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}
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/*
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* Fill LGR info with 2.2.2 stsi data
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*/
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static void lgr_stsi_2_2_2(struct lgr_info *lgr_info)
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{
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2012-07-20 09:15:01 +00:00
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struct sysinfo_2_2_2 *si = (void *) lgr_page;
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2012-03-11 15:59:32 +00:00
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2012-09-06 12:42:13 +00:00
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if (stsi(si, 2, 2, 2))
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2012-03-11 15:59:32 +00:00
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return;
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cpascii(lgr_info->name, si->name, sizeof(si->name));
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memcpy(&lgr_info->lpar_number, &si->lpar_number,
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sizeof(lgr_info->lpar_number));
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}
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/*
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* Fill LGR info with 3.2.2 stsi data
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*/
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static void lgr_stsi_3_2_2(struct lgr_info *lgr_info)
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{
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2012-07-20 09:15:01 +00:00
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struct sysinfo_3_2_2 *si = (void *) lgr_page;
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2012-03-11 15:59:32 +00:00
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int i;
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2012-09-06 12:42:13 +00:00
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if (stsi(si, 3, 2, 2))
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2012-03-11 15:59:32 +00:00
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return;
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for (i = 0; i < min_t(u8, si->count, VM_LEVEL_MAX); i++) {
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cpascii(lgr_info->vm[i].name, si->vm[i].name,
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sizeof(si->vm[i].name));
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cpascii(lgr_info->vm[i].cpi, si->vm[i].cpi,
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sizeof(si->vm[i].cpi));
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}
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lgr_info->vm_count = si->count;
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}
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/*
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* Fill LGR info with current data
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*/
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static void lgr_info_get(struct lgr_info *lgr_info)
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{
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2012-09-06 12:42:13 +00:00
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int level;
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2012-03-11 15:59:32 +00:00
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memset(lgr_info, 0, sizeof(*lgr_info));
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stfle(lgr_info->stfle_fac_list, ARRAY_SIZE(lgr_info->stfle_fac_list));
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2012-09-06 12:42:13 +00:00
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level = stsi(NULL, 0, 0, 0);
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lgr_info->level = level;
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if (level >= 1)
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2012-03-11 15:59:32 +00:00
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lgr_stsi_1_1_1(lgr_info);
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2012-09-06 12:42:13 +00:00
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if (level >= 2)
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2012-03-11 15:59:32 +00:00
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lgr_stsi_2_2_2(lgr_info);
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2012-09-06 12:42:13 +00:00
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if (level >= 3)
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2012-03-11 15:59:32 +00:00
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lgr_stsi_3_2_2(lgr_info);
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}
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/*
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* Check if LGR info has changed and if yes log new LGR info to s390dbf
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*/
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void lgr_info_log(void)
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{
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static DEFINE_SPINLOCK(lgr_info_lock);
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unsigned long flags;
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if (!spin_trylock_irqsave(&lgr_info_lock, flags))
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return;
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lgr_info_get(&lgr_info_cur);
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if (memcmp(&lgr_info_last, &lgr_info_cur, sizeof(lgr_info_cur)) != 0) {
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debug_event(lgr_dbf, 1, &lgr_info_cur, sizeof(lgr_info_cur));
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lgr_info_last = lgr_info_cur;
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}
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spin_unlock_irqrestore(&lgr_info_lock, flags);
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}
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EXPORT_SYMBOL_GPL(lgr_info_log);
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static void lgr_timer_set(void);
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/*
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* LGR timer callback
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*/
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2017-10-04 23:27:00 +00:00
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static void lgr_timer_fn(struct timer_list *unused)
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2012-03-11 15:59:32 +00:00
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{
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lgr_info_log();
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lgr_timer_set();
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}
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2017-10-04 23:27:00 +00:00
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static struct timer_list lgr_timer;
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2012-03-11 15:59:32 +00:00
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/*
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* Setup next LGR timer
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*/
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static void lgr_timer_set(void)
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{
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2020-06-12 11:06:07 +00:00
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mod_timer(&lgr_timer, jiffies + msecs_to_jiffies(LGR_TIMER_INTERVAL_SECS * MSEC_PER_SEC));
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2012-03-11 15:59:32 +00:00
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}
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/*
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* Initialize LGR: Add s390dbf, write initial lgr_info and setup timer
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*/
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static int __init lgr_init(void)
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{
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lgr_dbf = debug_register("lgr", 1, 1, sizeof(struct lgr_info));
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2012-07-20 09:15:01 +00:00
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if (!lgr_dbf)
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2012-03-11 15:59:32 +00:00
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return -ENOMEM;
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debug_register_view(lgr_dbf, &debug_hex_ascii_view);
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lgr_info_get(&lgr_info_last);
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debug_event(lgr_dbf, 1, &lgr_info_last, sizeof(lgr_info_last));
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2017-10-04 23:27:00 +00:00
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timer_setup(&lgr_timer, lgr_timer_fn, TIMER_DEFERRABLE);
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2012-03-11 15:59:32 +00:00
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lgr_timer_set();
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return 0;
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}
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2016-10-30 20:37:31 +00:00
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device_initcall(lgr_init);
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