Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Linux Guest Relocation (LGR) detection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright IBM Corp. 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <asm/facility.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/sysinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <asm/ebcdic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <asm/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/ipl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define LGR_TIMER_INTERVAL_SECS (30 * 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define VM_LEVEL_MAX 2 /* Maximum is 8, but we only record two levels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * LGR info: Contains stfle and stsi data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) struct lgr_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	/* Bit field with facility information: 4 DWORDs are stored */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	u64 stfle_fac_list[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	/* Level of system (1 = CEC, 2 = LPAR, 3 = z/VM */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	u32 level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	/* Level 1: CEC info (stsi 1.1.1) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	char manufacturer[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	char type[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	char sequence[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	char plant[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	char model[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	/* Level 2: LPAR info (stsi 2.2.2) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	u16 lpar_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	char name[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	/* Level 3: VM info (stsi 3.2.2) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	u8 vm_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		char name[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		char cpi[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	} vm[VM_LEVEL_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) } __packed __aligned(8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * LGR globals
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static char lgr_page[PAGE_SIZE] __aligned(PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static struct lgr_info lgr_info_last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static struct lgr_info lgr_info_cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static struct debug_info *lgr_dbf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * Copy buffer and then convert it to ASCII
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static void cpascii(char *dst, char *src, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	memcpy(dst, src, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	EBCASC(dst, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * Fill LGR info with 1.1.1 stsi data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static void lgr_stsi_1_1_1(struct lgr_info *lgr_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	struct sysinfo_1_1_1 *si = (void *) lgr_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (stsi(si, 1, 1, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	cpascii(lgr_info->manufacturer, si->manufacturer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		sizeof(si->manufacturer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	cpascii(lgr_info->type, si->type, sizeof(si->type));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	cpascii(lgr_info->model, si->model, sizeof(si->model));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	cpascii(lgr_info->sequence, si->sequence, sizeof(si->sequence));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	cpascii(lgr_info->plant, si->plant, sizeof(si->plant));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * Fill LGR info with 2.2.2 stsi data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void lgr_stsi_2_2_2(struct lgr_info *lgr_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct sysinfo_2_2_2 *si = (void *) lgr_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (stsi(si, 2, 2, 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	cpascii(lgr_info->name, si->name, sizeof(si->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	memcpy(&lgr_info->lpar_number, &si->lpar_number,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	       sizeof(lgr_info->lpar_number));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * Fill LGR info with 3.2.2 stsi data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static void lgr_stsi_3_2_2(struct lgr_info *lgr_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct sysinfo_3_2_2 *si = (void *) lgr_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (stsi(si, 3, 2, 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	for (i = 0; i < min_t(u8, si->count, VM_LEVEL_MAX); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		cpascii(lgr_info->vm[i].name, si->vm[i].name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			sizeof(si->vm[i].name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		cpascii(lgr_info->vm[i].cpi, si->vm[i].cpi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			sizeof(si->vm[i].cpi));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	lgr_info->vm_count = si->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  * Fill LGR info with current data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static void lgr_info_get(struct lgr_info *lgr_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	memset(lgr_info, 0, sizeof(*lgr_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	stfle(lgr_info->stfle_fac_list, ARRAY_SIZE(lgr_info->stfle_fac_list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	level = stsi(NULL, 0, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	lgr_info->level = level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (level >= 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		lgr_stsi_1_1_1(lgr_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (level >= 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		lgr_stsi_2_2_2(lgr_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (level >= 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		lgr_stsi_3_2_2(lgr_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * Check if LGR info has changed and if yes log new LGR info to s390dbf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void lgr_info_log(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	static DEFINE_SPINLOCK(lgr_info_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (!spin_trylock_irqsave(&lgr_info_lock, flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	lgr_info_get(&lgr_info_cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (memcmp(&lgr_info_last, &lgr_info_cur, sizeof(lgr_info_cur)) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		debug_event(lgr_dbf, 1, &lgr_info_cur, sizeof(lgr_info_cur));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		lgr_info_last = lgr_info_cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	spin_unlock_irqrestore(&lgr_info_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) EXPORT_SYMBOL_GPL(lgr_info_log);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static void lgr_timer_set(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  * LGR timer callback
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static void lgr_timer_fn(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	lgr_info_log();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	lgr_timer_set();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static struct timer_list lgr_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  * Setup next LGR timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static void lgr_timer_set(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	mod_timer(&lgr_timer, jiffies + msecs_to_jiffies(LGR_TIMER_INTERVAL_SECS * MSEC_PER_SEC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)  * Initialize LGR: Add s390dbf, write initial lgr_info and setup timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int __init lgr_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	lgr_dbf = debug_register("lgr", 1, 1, sizeof(struct lgr_info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	if (!lgr_dbf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	debug_register_view(lgr_dbf, &debug_hex_ascii_view);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	lgr_info_get(&lgr_info_last);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	debug_event(lgr_dbf, 1, &lgr_info_last, sizeof(lgr_info_last));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	timer_setup(&lgr_timer, lgr_timer_fn, TIMER_DEFERRABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	lgr_timer_set();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) device_initcall(lgr_init);