114a43e69SBenjamin Herrenschmidt /* 214a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 314a43e69SBenjamin Herrenschmidt * 414a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 514a43e69SBenjamin Herrenschmidt * 614a43e69SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 714a43e69SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 814a43e69SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 914a43e69SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1014a43e69SBenjamin Herrenschmidt */ 1114a43e69SBenjamin Herrenschmidt 1214a43e69SBenjamin Herrenschmidt #undef DEBUG 1314a43e69SBenjamin Herrenschmidt 1414a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1514a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1626a2056eSRob Herring #include <linux/of_fdt.h> 1714a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 18a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 191bc98de2SGavin Shan #include <linux/notifier.h> 2073ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 21b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 226f68b5e2SVasant Hegde #include <linux/kobject.h> 23f7d98d18SVasant Hegde #include <linux/delay.h> 2455672ecfSMahesh Salgaonkar #include <linux/memblock.h> 2514a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 2614a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 2736df96f8SMahesh Salgaonkar #include <asm/mce.h> 2814a43e69SBenjamin Herrenschmidt 2914a43e69SBenjamin Herrenschmidt #include "powernv.h" 3014a43e69SBenjamin Herrenschmidt 316f68b5e2SVasant Hegde /* /sys/firmware/opal */ 326f68b5e2SVasant Hegde struct kobject *opal_kobj; 336f68b5e2SVasant Hegde 3414a43e69SBenjamin Herrenschmidt struct opal { 3514a43e69SBenjamin Herrenschmidt u64 base; 3614a43e69SBenjamin Herrenschmidt u64 entry; 3755672ecfSMahesh Salgaonkar u64 size; 3814a43e69SBenjamin Herrenschmidt } opal; 3914a43e69SBenjamin Herrenschmidt 4055672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4155672ecfSMahesh Salgaonkar u64 start_addr; 4255672ecfSMahesh Salgaonkar u64 end_addr; 4355672ecfSMahesh Salgaonkar u64 recover_addr; 4455672ecfSMahesh Salgaonkar }; 4555672ecfSMahesh Salgaonkar 4655672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 4755672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 4855672ecfSMahesh Salgaonkar 4914a43e69SBenjamin Herrenschmidt static struct device_node *opal_node; 5014a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 51ed79ba9eSBenjamin Herrenschmidt extern u64 opal_mc_secondary_handler[]; 5273ed148aSBenjamin Herrenschmidt static unsigned int *opal_irqs; 5373ed148aSBenjamin Herrenschmidt static unsigned int opal_irq_count; 541bc98de2SGavin Shan static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); 5524366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 561bc98de2SGavin Shan static DEFINE_SPINLOCK(opal_notifier_lock); 571bc98de2SGavin Shan static uint64_t last_notified_mask = 0x0ul; 581bc98de2SGavin Shan static atomic_t opal_notifier_hold = ATOMIC_INIT(0); 5914a43e69SBenjamin Herrenschmidt 6014a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 6114a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 6214a43e69SBenjamin Herrenschmidt { 6355672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 6455672ecfSMahesh Salgaonkar unsigned long basesz, entrysz, runtimesz; 6514a43e69SBenjamin Herrenschmidt 6614a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 6714a43e69SBenjamin Herrenschmidt return 0; 6814a43e69SBenjamin Herrenschmidt 6914a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 7014a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 7155672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 7214a43e69SBenjamin Herrenschmidt 7355672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 7414a43e69SBenjamin Herrenschmidt return 1; 7514a43e69SBenjamin Herrenschmidt 7614a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 7714a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 7855672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 7914a43e69SBenjamin Herrenschmidt 8014a43e69SBenjamin Herrenschmidt pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n", 8114a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 8214a43e69SBenjamin Herrenschmidt pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n", 8314a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 8455672ecfSMahesh Salgaonkar pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%ld)\n", 8555672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 8614a43e69SBenjamin Herrenschmidt 8714a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPAL; 8875b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 8975b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 9075b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv3; 9175b93da4SBenjamin Herrenschmidt printk("OPAL V3 detected !\n"); 9275b93da4SBenjamin Herrenschmidt } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { 9314a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 9414a43e69SBenjamin Herrenschmidt printk("OPAL V2 detected !\n"); 9514a43e69SBenjamin Herrenschmidt } else { 9614a43e69SBenjamin Herrenschmidt printk("OPAL V1 detected !\n"); 9714a43e69SBenjamin Herrenschmidt } 9814a43e69SBenjamin Herrenschmidt 99c4463b37SJeremy Kerr return 1; 100c4463b37SJeremy Kerr } 101c4463b37SJeremy Kerr 10255672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 10355672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 10455672ecfSMahesh Salgaonkar { 10555672ecfSMahesh Salgaonkar unsigned long i, size; 10655672ecfSMahesh Salgaonkar const __be32 *prop; 10755672ecfSMahesh Salgaonkar 10855672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10955672ecfSMahesh Salgaonkar return 0; 11055672ecfSMahesh Salgaonkar 11155672ecfSMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &size); 11255672ecfSMahesh Salgaonkar 11355672ecfSMahesh Salgaonkar if (!prop) 11455672ecfSMahesh Salgaonkar return 1; 11555672ecfSMahesh Salgaonkar 11655672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 11755672ecfSMahesh Salgaonkar 11855672ecfSMahesh Salgaonkar /* 11955672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 12055672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 12155672ecfSMahesh Salgaonkar * RMO region. 12255672ecfSMahesh Salgaonkar */ 12355672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 12455672ecfSMahesh Salgaonkar ppc64_rma_size)); 12555672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 12655672ecfSMahesh Salgaonkar 12755672ecfSMahesh Salgaonkar /* 12855672ecfSMahesh Salgaonkar * Each recoverable address entry is an (start address,len, 12955672ecfSMahesh Salgaonkar * recover address) pair, * 2 cells each, totalling 4 cells per entry. 13055672ecfSMahesh Salgaonkar */ 13155672ecfSMahesh Salgaonkar for (i = 0; i < size / (sizeof(*prop) * 5); i++) { 13255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 13355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 13455672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 13555672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 13655672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 13755672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 13855672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 13955672ecfSMahesh Salgaonkar 14055672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 14155672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 14255672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 14355672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 14455672ecfSMahesh Salgaonkar } 14555672ecfSMahesh Salgaonkar mc_recoverable_range_len = i; 14655672ecfSMahesh Salgaonkar return 1; 14755672ecfSMahesh Salgaonkar } 14855672ecfSMahesh Salgaonkar 149c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 150c4463b37SJeremy Kerr { 15129186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 152c4463b37SJeremy Kerr u64 glue; 153c4463b37SJeremy Kerr 154c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 155c4463b37SJeremy Kerr return -ENODEV; 156c4463b37SJeremy Kerr 15728446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 15828446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 159ed79ba9eSBenjamin Herrenschmidt */ 160ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 161ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 162ed79ba9eSBenjamin Herrenschmidt 0, glue); 163ed79ba9eSBenjamin Herrenschmidt glue += 128; 164ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 16529186097SBenjamin Herrenschmidt #endif 166ed79ba9eSBenjamin Herrenschmidt 167c4463b37SJeremy Kerr return 0; 16814a43e69SBenjamin Herrenschmidt } 16914a43e69SBenjamin Herrenschmidt 170c4463b37SJeremy Kerr early_initcall(opal_register_exception_handlers); 171c4463b37SJeremy Kerr 1721bc98de2SGavin Shan int opal_notifier_register(struct notifier_block *nb) 1731bc98de2SGavin Shan { 1741bc98de2SGavin Shan if (!nb) { 1751bc98de2SGavin Shan pr_warning("%s: Invalid argument (%p)\n", 1761bc98de2SGavin Shan __func__, nb); 1771bc98de2SGavin Shan return -EINVAL; 1781bc98de2SGavin Shan } 1791bc98de2SGavin Shan 1801bc98de2SGavin Shan atomic_notifier_chain_register(&opal_notifier_head, nb); 1811bc98de2SGavin Shan return 0; 1821bc98de2SGavin Shan } 1831bc98de2SGavin Shan 1841bc98de2SGavin Shan static void opal_do_notifier(uint64_t events) 1851bc98de2SGavin Shan { 1861bc98de2SGavin Shan unsigned long flags; 1871bc98de2SGavin Shan uint64_t changed_mask; 1881bc98de2SGavin Shan 1891bc98de2SGavin Shan if (atomic_read(&opal_notifier_hold)) 1901bc98de2SGavin Shan return; 1911bc98de2SGavin Shan 1921bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 1931bc98de2SGavin Shan changed_mask = last_notified_mask ^ events; 1941bc98de2SGavin Shan last_notified_mask = events; 1951bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 1961bc98de2SGavin Shan 1971bc98de2SGavin Shan /* 1981bc98de2SGavin Shan * We feed with the event bits and changed bits for 1991bc98de2SGavin Shan * enough information to the callback. 2001bc98de2SGavin Shan */ 2011bc98de2SGavin Shan atomic_notifier_call_chain(&opal_notifier_head, 2021bc98de2SGavin Shan events, (void *)changed_mask); 2031bc98de2SGavin Shan } 2041bc98de2SGavin Shan 2051bc98de2SGavin Shan void opal_notifier_update_evt(uint64_t evt_mask, 2061bc98de2SGavin Shan uint64_t evt_val) 2071bc98de2SGavin Shan { 2081bc98de2SGavin Shan unsigned long flags; 2091bc98de2SGavin Shan 2101bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2111bc98de2SGavin Shan last_notified_mask &= ~evt_mask; 2121bc98de2SGavin Shan last_notified_mask |= evt_val; 2131bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2141bc98de2SGavin Shan } 2151bc98de2SGavin Shan 2161bc98de2SGavin Shan void opal_notifier_enable(void) 2171bc98de2SGavin Shan { 2181bc98de2SGavin Shan int64_t rc; 2191bc98de2SGavin Shan uint64_t evt = 0; 2201bc98de2SGavin Shan 2211bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 0); 2221bc98de2SGavin Shan 2231bc98de2SGavin Shan /* Process pending events */ 2241bc98de2SGavin Shan rc = opal_poll_events(&evt); 2251bc98de2SGavin Shan if (rc == OPAL_SUCCESS && evt) 2261bc98de2SGavin Shan opal_do_notifier(evt); 2271bc98de2SGavin Shan } 2281bc98de2SGavin Shan 2291bc98de2SGavin Shan void opal_notifier_disable(void) 2301bc98de2SGavin Shan { 2311bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 1); 2321bc98de2SGavin Shan } 2331bc98de2SGavin Shan 23424366360SMahesh Salgaonkar /* 23524366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 23624366360SMahesh Salgaonkar * notified for specific messgae type. 23724366360SMahesh Salgaonkar */ 23824366360SMahesh Salgaonkar int opal_message_notifier_register(enum OpalMessageType msg_type, 23924366360SMahesh Salgaonkar struct notifier_block *nb) 24024366360SMahesh Salgaonkar { 24124366360SMahesh Salgaonkar if (!nb) { 24224366360SMahesh Salgaonkar pr_warning("%s: Invalid argument (%p)\n", 24324366360SMahesh Salgaonkar __func__, nb); 24424366360SMahesh Salgaonkar return -EINVAL; 24524366360SMahesh Salgaonkar } 24624366360SMahesh Salgaonkar if (msg_type > OPAL_MSG_TYPE_MAX) { 24724366360SMahesh Salgaonkar pr_warning("%s: Invalid message type argument (%d)\n", 24824366360SMahesh Salgaonkar __func__, msg_type); 24924366360SMahesh Salgaonkar return -EINVAL; 25024366360SMahesh Salgaonkar } 25124366360SMahesh Salgaonkar return atomic_notifier_chain_register( 25224366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 25324366360SMahesh Salgaonkar } 25424366360SMahesh Salgaonkar 25524366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 25624366360SMahesh Salgaonkar { 25724366360SMahesh Salgaonkar /* notify subscribers */ 25824366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 25924366360SMahesh Salgaonkar msg_type, msg); 26024366360SMahesh Salgaonkar } 26124366360SMahesh Salgaonkar 26224366360SMahesh Salgaonkar static void opal_handle_message(void) 26324366360SMahesh Salgaonkar { 26424366360SMahesh Salgaonkar s64 ret; 26524366360SMahesh Salgaonkar /* 26624366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 26724366360SMahesh Salgaonkar * value in /proc/device-tree. 26824366360SMahesh Salgaonkar */ 26924366360SMahesh Salgaonkar static struct opal_msg msg; 27024366360SMahesh Salgaonkar 27124366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 27224366360SMahesh Salgaonkar /* No opal message pending. */ 27324366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 27424366360SMahesh Salgaonkar return; 27524366360SMahesh Salgaonkar 27624366360SMahesh Salgaonkar /* check for errors. */ 27724366360SMahesh Salgaonkar if (ret) { 27824366360SMahesh Salgaonkar pr_warning("%s: Failed to retrive opal message, err=%lld\n", 27924366360SMahesh Salgaonkar __func__, ret); 28024366360SMahesh Salgaonkar return; 28124366360SMahesh Salgaonkar } 28224366360SMahesh Salgaonkar 28324366360SMahesh Salgaonkar /* Sanity check */ 28424366360SMahesh Salgaonkar if (msg.msg_type > OPAL_MSG_TYPE_MAX) { 28524366360SMahesh Salgaonkar pr_warning("%s: Unknown message type: %u\n", 28624366360SMahesh Salgaonkar __func__, msg.msg_type); 28724366360SMahesh Salgaonkar return; 28824366360SMahesh Salgaonkar } 28924366360SMahesh Salgaonkar opal_message_do_notify(msg.msg_type, (void *)&msg); 29024366360SMahesh Salgaonkar } 29124366360SMahesh Salgaonkar 29224366360SMahesh Salgaonkar static int opal_message_notify(struct notifier_block *nb, 29324366360SMahesh Salgaonkar unsigned long events, void *change) 29424366360SMahesh Salgaonkar { 29524366360SMahesh Salgaonkar if (events & OPAL_EVENT_MSG_PENDING) 29624366360SMahesh Salgaonkar opal_handle_message(); 29724366360SMahesh Salgaonkar return 0; 29824366360SMahesh Salgaonkar } 29924366360SMahesh Salgaonkar 30024366360SMahesh Salgaonkar static struct notifier_block opal_message_nb = { 30124366360SMahesh Salgaonkar .notifier_call = opal_message_notify, 30224366360SMahesh Salgaonkar .next = NULL, 30324366360SMahesh Salgaonkar .priority = 0, 30424366360SMahesh Salgaonkar }; 30524366360SMahesh Salgaonkar 30624366360SMahesh Salgaonkar static int __init opal_message_init(void) 30724366360SMahesh Salgaonkar { 30824366360SMahesh Salgaonkar int ret, i; 30924366360SMahesh Salgaonkar 31024366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 31124366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 31224366360SMahesh Salgaonkar 31324366360SMahesh Salgaonkar ret = opal_notifier_register(&opal_message_nb); 31424366360SMahesh Salgaonkar if (ret) { 31524366360SMahesh Salgaonkar pr_err("%s: Can't register OPAL event notifier (%d)\n", 31624366360SMahesh Salgaonkar __func__, ret); 31724366360SMahesh Salgaonkar return ret; 31824366360SMahesh Salgaonkar } 31924366360SMahesh Salgaonkar return 0; 32024366360SMahesh Salgaonkar } 32124366360SMahesh Salgaonkar early_initcall(opal_message_init); 32224366360SMahesh Salgaonkar 32314a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 32414a43e69SBenjamin Herrenschmidt { 3254f89363bSBenjamin Herrenschmidt s64 rc; 3264f89363bSBenjamin Herrenschmidt __be64 evt, len; 32714a43e69SBenjamin Herrenschmidt 32814a43e69SBenjamin Herrenschmidt if (!opal.entry) 329daea1175SBenjamin Herrenschmidt return -ENODEV; 33014a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3314f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 33214a43e69SBenjamin Herrenschmidt return 0; 3334f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 33414a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 33514a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3364f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 33714a43e69SBenjamin Herrenschmidt return 0; 33814a43e69SBenjamin Herrenschmidt } 33914a43e69SBenjamin Herrenschmidt 34014a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 34114a43e69SBenjamin Herrenschmidt { 34214a43e69SBenjamin Herrenschmidt int written = 0; 3434f89363bSBenjamin Herrenschmidt __be64 olen; 344daea1175SBenjamin Herrenschmidt s64 len, rc; 34514a43e69SBenjamin Herrenschmidt unsigned long flags; 3464f89363bSBenjamin Herrenschmidt __be64 evt; 34714a43e69SBenjamin Herrenschmidt 34814a43e69SBenjamin Herrenschmidt if (!opal.entry) 349daea1175SBenjamin Herrenschmidt return -ENODEV; 35014a43e69SBenjamin Herrenschmidt 35114a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 35214a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 353daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 354daea1175SBenjamin Herrenschmidt * 355daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 356daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 357daea1175SBenjamin Herrenschmidt * enough room and be done with it 35814a43e69SBenjamin Herrenschmidt */ 35914a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 360daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 3614f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3624f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 36314a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 36414a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 36514a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 36614a43e69SBenjamin Herrenschmidt if (rc) 36714a43e69SBenjamin Herrenschmidt return total_len; 3684f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 36914a43e69SBenjamin Herrenschmidt return -EAGAIN; 37014a43e69SBenjamin Herrenschmidt } 371daea1175SBenjamin Herrenschmidt } 37214a43e69SBenjamin Herrenschmidt 37314a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 37414a43e69SBenjamin Herrenschmidt * should no longer happen. 37514a43e69SBenjamin Herrenschmidt */ 376daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 37714a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 37814a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3794f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3804f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3814f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3821de1455fSBenjamin Herrenschmidt 3831de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3841de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3851de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3861de1455fSBenjamin Herrenschmidt written = total_len; 3871de1455fSBenjamin Herrenschmidt break; 3881de1455fSBenjamin Herrenschmidt } 38914a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 39014a43e69SBenjamin Herrenschmidt total_len -= len; 39114a43e69SBenjamin Herrenschmidt data += len; 39214a43e69SBenjamin Herrenschmidt written += len; 39314a43e69SBenjamin Herrenschmidt } 39414a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 39514a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 39614a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 39714a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 39814a43e69SBenjamin Herrenschmidt */ 39914a43e69SBenjamin Herrenschmidt do 40014a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4014f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4024f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 40314a43e69SBenjamin Herrenschmidt } 40414a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 40514a43e69SBenjamin Herrenschmidt return written; 40614a43e69SBenjamin Herrenschmidt } 40714a43e69SBenjamin Herrenschmidt 408b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 409b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 410b63a0ffeSMahesh Salgaonkar { 411b63a0ffeSMahesh Salgaonkar int recovered = 0; 412b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 413b63a0ffeSMahesh Salgaonkar 414b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 415b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 416b63a0ffeSMahesh Salgaonkar recovered = 0; 417b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 418b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 419b63a0ffeSMahesh Salgaonkar recovered = 1; 420b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 421b63a0ffeSMahesh Salgaonkar /* 422b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 423b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 424b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 425b63a0ffeSMahesh Salgaonkar * in userspace. 426b63a0ffeSMahesh Salgaonkar * 427b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 428b63a0ffeSMahesh Salgaonkar */ 429b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 430b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 431b63a0ffeSMahesh Salgaonkar recovered = 1; 432b63a0ffeSMahesh Salgaonkar } else 433b63a0ffeSMahesh Salgaonkar recovered = 0; 434b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 435b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 436b63a0ffeSMahesh Salgaonkar /* 437b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 438b63a0ffeSMahesh Salgaonkar * kill the task. 439b63a0ffeSMahesh Salgaonkar */ 440b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 441b63a0ffeSMahesh Salgaonkar recovered = 1; 442b63a0ffeSMahesh Salgaonkar } 443b63a0ffeSMahesh Salgaonkar return recovered; 444b63a0ffeSMahesh Salgaonkar } 445b63a0ffeSMahesh Salgaonkar 446ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 447ed79ba9eSBenjamin Herrenschmidt { 44836df96f8SMahesh Salgaonkar struct machine_check_event evt; 449ed79ba9eSBenjamin Herrenschmidt 45036df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 45136df96f8SMahesh Salgaonkar return 0; 452ed79ba9eSBenjamin Herrenschmidt 453ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 45436df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 455ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 456ed79ba9eSBenjamin Herrenschmidt evt.version); 457ed79ba9eSBenjamin Herrenschmidt return 0; 458ed79ba9eSBenjamin Herrenschmidt } 459b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 460ed79ba9eSBenjamin Herrenschmidt 461b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 462b63a0ffeSMahesh Salgaonkar return 1; 463b63a0ffeSMahesh Salgaonkar return 0; 464ed79ba9eSBenjamin Herrenschmidt } 465ed79ba9eSBenjamin Herrenschmidt 46655672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 46755672ecfSMahesh Salgaonkar { 46855672ecfSMahesh Salgaonkar int i; 46955672ecfSMahesh Salgaonkar 47055672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 47155672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 47255672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 47355672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 47455672ecfSMahesh Salgaonkar return 0; 47555672ecfSMahesh Salgaonkar } 47655672ecfSMahesh Salgaonkar 47755672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 47855672ecfSMahesh Salgaonkar { 47955672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 48055672ecfSMahesh Salgaonkar 48155672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 48255672ecfSMahesh Salgaonkar goto out; 48355672ecfSMahesh Salgaonkar 48455672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 48555672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 48655672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 48755672ecfSMahesh Salgaonkar 48855672ecfSMahesh Salgaonkar /* 48955672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 49055672ecfSMahesh Salgaonkar */ 49155672ecfSMahesh Salgaonkar if (recover_addr) 49255672ecfSMahesh Salgaonkar regs->nip = recover_addr; 49355672ecfSMahesh Salgaonkar 49455672ecfSMahesh Salgaonkar out: 49555672ecfSMahesh Salgaonkar return !!recover_addr; 49655672ecfSMahesh Salgaonkar } 49755672ecfSMahesh Salgaonkar 498a125e092SBenjamin Herrenschmidt static irqreturn_t opal_interrupt(int irq, void *data) 499a125e092SBenjamin Herrenschmidt { 5005e4da530SAnton Blanchard __be64 events; 501a125e092SBenjamin Herrenschmidt 502a125e092SBenjamin Herrenschmidt opal_handle_interrupt(virq_to_hw(irq), &events); 503a125e092SBenjamin Herrenschmidt 5041bc98de2SGavin Shan opal_do_notifier(events); 505a125e092SBenjamin Herrenschmidt 506a125e092SBenjamin Herrenschmidt return IRQ_HANDLED; 507a125e092SBenjamin Herrenschmidt } 508a125e092SBenjamin Herrenschmidt 5096f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5106f68b5e2SVasant Hegde { 5116f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5126f68b5e2SVasant Hegde if (!opal_kobj) { 5136f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5146f68b5e2SVasant Hegde return -ENOMEM; 5156f68b5e2SVasant Hegde } 5166f68b5e2SVasant Hegde 5176f68b5e2SVasant Hegde return 0; 5186f68b5e2SVasant Hegde } 5196f68b5e2SVasant Hegde 52014a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 52114a43e69SBenjamin Herrenschmidt { 52214a43e69SBenjamin Herrenschmidt struct device_node *np, *consoles; 5231cc79bc8SAlistair Popple const __be32 *irqs; 524a125e092SBenjamin Herrenschmidt int rc, i, irqlen; 52514a43e69SBenjamin Herrenschmidt 52614a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 52714a43e69SBenjamin Herrenschmidt if (!opal_node) { 52814a43e69SBenjamin Herrenschmidt pr_warn("opal: Node not found\n"); 52914a43e69SBenjamin Herrenschmidt return -ENODEV; 53014a43e69SBenjamin Herrenschmidt } 5312db29d28SBenjamin Herrenschmidt 5322db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 53314a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 53414a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 53514a43e69SBenjamin Herrenschmidt else 53614a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 5372db29d28SBenjamin Herrenschmidt if (consoles) { 53814a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 53914a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 54014a43e69SBenjamin Herrenschmidt continue; 54114a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 54214a43e69SBenjamin Herrenschmidt } 54314a43e69SBenjamin Herrenschmidt of_node_put(consoles); 5442db29d28SBenjamin Herrenschmidt } 545a125e092SBenjamin Herrenschmidt 546a125e092SBenjamin Herrenschmidt /* Find all OPAL interrupts and request them */ 547a125e092SBenjamin Herrenschmidt irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 548a125e092SBenjamin Herrenschmidt pr_debug("opal: Found %d interrupts reserved for OPAL\n", 549a125e092SBenjamin Herrenschmidt irqs ? (irqlen / 4) : 0); 55073ed148aSBenjamin Herrenschmidt opal_irq_count = irqlen / 4; 55173ed148aSBenjamin Herrenschmidt opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 552a125e092SBenjamin Herrenschmidt for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { 553a125e092SBenjamin Herrenschmidt unsigned int hwirq = be32_to_cpup(irqs); 554a125e092SBenjamin Herrenschmidt unsigned int irq = irq_create_mapping(NULL, hwirq); 555a125e092SBenjamin Herrenschmidt if (irq == NO_IRQ) { 556a125e092SBenjamin Herrenschmidt pr_warning("opal: Failed to map irq 0x%x\n", hwirq); 557a125e092SBenjamin Herrenschmidt continue; 558a125e092SBenjamin Herrenschmidt } 559a125e092SBenjamin Herrenschmidt rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); 560a125e092SBenjamin Herrenschmidt if (rc) 561a125e092SBenjamin Herrenschmidt pr_warning("opal: Error %d requesting irq %d" 562a125e092SBenjamin Herrenschmidt " (0x%x)\n", rc, irq, hwirq); 56373ed148aSBenjamin Herrenschmidt opal_irqs[i] = irq; 564a125e092SBenjamin Herrenschmidt } 5656f68b5e2SVasant Hegde 5666f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 5676f68b5e2SVasant Hegde rc = opal_sysfs_init(); 56850bd6153SVasant Hegde if (rc == 0) { 56950bd6153SVasant Hegde /* Setup code update interface */ 57050bd6153SVasant Hegde opal_flash_init(); 57150bd6153SVasant Hegde } 5726f68b5e2SVasant Hegde 57314a43e69SBenjamin Herrenschmidt return 0; 57414a43e69SBenjamin Herrenschmidt } 57514a43e69SBenjamin Herrenschmidt subsys_initcall(opal_init); 57673ed148aSBenjamin Herrenschmidt 57773ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 57873ed148aSBenjamin Herrenschmidt { 57973ed148aSBenjamin Herrenschmidt unsigned int i; 580f7d98d18SVasant Hegde long rc = OPAL_BUSY; 58173ed148aSBenjamin Herrenschmidt 582f7d98d18SVasant Hegde /* First free interrupts, which will also mask them */ 58373ed148aSBenjamin Herrenschmidt for (i = 0; i < opal_irq_count; i++) { 58473ed148aSBenjamin Herrenschmidt if (opal_irqs[i]) 585b0d436c7SAnton Blanchard free_irq(opal_irqs[i], NULL); 58673ed148aSBenjamin Herrenschmidt opal_irqs[i] = 0; 58773ed148aSBenjamin Herrenschmidt } 588f7d98d18SVasant Hegde 589f7d98d18SVasant Hegde /* 590f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 591f7d98d18SVasant Hegde * potentially write to our memory has completed such 592f7d98d18SVasant Hegde * as an ongoing dump retrieval 593f7d98d18SVasant Hegde */ 594f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 595f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 596f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 597f7d98d18SVasant Hegde opal_poll_events(NULL); 598f7d98d18SVasant Hegde else 599f7d98d18SVasant Hegde mdelay(10); 600f7d98d18SVasant Hegde } 60173ed148aSBenjamin Herrenschmidt } 602