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 } 183798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_register); 184798af00cSBenjamin Herrenschmidt 185798af00cSBenjamin Herrenschmidt int opal_notifier_unregister(struct notifier_block *nb) 186798af00cSBenjamin Herrenschmidt { 187798af00cSBenjamin Herrenschmidt if (!nb) { 188798af00cSBenjamin Herrenschmidt pr_warning("%s: Invalid argument (%p)\n", 189798af00cSBenjamin Herrenschmidt __func__, nb); 190798af00cSBenjamin Herrenschmidt return -EINVAL; 191798af00cSBenjamin Herrenschmidt } 192798af00cSBenjamin Herrenschmidt 193798af00cSBenjamin Herrenschmidt atomic_notifier_chain_unregister(&opal_notifier_head, nb); 194798af00cSBenjamin Herrenschmidt return 0; 195798af00cSBenjamin Herrenschmidt } 196798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_unregister); 1971bc98de2SGavin Shan 1981bc98de2SGavin Shan static void opal_do_notifier(uint64_t events) 1991bc98de2SGavin Shan { 2001bc98de2SGavin Shan unsigned long flags; 2011bc98de2SGavin Shan uint64_t changed_mask; 2021bc98de2SGavin Shan 2031bc98de2SGavin Shan if (atomic_read(&opal_notifier_hold)) 2041bc98de2SGavin Shan return; 2051bc98de2SGavin Shan 2061bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2071bc98de2SGavin Shan changed_mask = last_notified_mask ^ events; 2081bc98de2SGavin Shan last_notified_mask = events; 2091bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2101bc98de2SGavin Shan 2111bc98de2SGavin Shan /* 2121bc98de2SGavin Shan * We feed with the event bits and changed bits for 2131bc98de2SGavin Shan * enough information to the callback. 2141bc98de2SGavin Shan */ 2151bc98de2SGavin Shan atomic_notifier_call_chain(&opal_notifier_head, 2161bc98de2SGavin Shan events, (void *)changed_mask); 2171bc98de2SGavin Shan } 2181bc98de2SGavin Shan 2191bc98de2SGavin Shan void opal_notifier_update_evt(uint64_t evt_mask, 2201bc98de2SGavin Shan uint64_t evt_val) 2211bc98de2SGavin Shan { 2221bc98de2SGavin Shan unsigned long flags; 2231bc98de2SGavin Shan 2241bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2251bc98de2SGavin Shan last_notified_mask &= ~evt_mask; 2261bc98de2SGavin Shan last_notified_mask |= evt_val; 2271bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2281bc98de2SGavin Shan } 2291bc98de2SGavin Shan 2301bc98de2SGavin Shan void opal_notifier_enable(void) 2311bc98de2SGavin Shan { 2321bc98de2SGavin Shan int64_t rc; 2331bc98de2SGavin Shan uint64_t evt = 0; 2341bc98de2SGavin Shan 2351bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 0); 2361bc98de2SGavin Shan 2371bc98de2SGavin Shan /* Process pending events */ 2381bc98de2SGavin Shan rc = opal_poll_events(&evt); 2391bc98de2SGavin Shan if (rc == OPAL_SUCCESS && evt) 2401bc98de2SGavin Shan opal_do_notifier(evt); 2411bc98de2SGavin Shan } 2421bc98de2SGavin Shan 2431bc98de2SGavin Shan void opal_notifier_disable(void) 2441bc98de2SGavin Shan { 2451bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 1); 2461bc98de2SGavin Shan } 2471bc98de2SGavin Shan 24824366360SMahesh Salgaonkar /* 24924366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 25024366360SMahesh Salgaonkar * notified for specific messgae type. 25124366360SMahesh Salgaonkar */ 25224366360SMahesh Salgaonkar int opal_message_notifier_register(enum OpalMessageType msg_type, 25324366360SMahesh Salgaonkar struct notifier_block *nb) 25424366360SMahesh Salgaonkar { 25524366360SMahesh Salgaonkar if (!nb) { 25624366360SMahesh Salgaonkar pr_warning("%s: Invalid argument (%p)\n", 25724366360SMahesh Salgaonkar __func__, nb); 25824366360SMahesh Salgaonkar return -EINVAL; 25924366360SMahesh Salgaonkar } 26024366360SMahesh Salgaonkar if (msg_type > OPAL_MSG_TYPE_MAX) { 26124366360SMahesh Salgaonkar pr_warning("%s: Invalid message type argument (%d)\n", 26224366360SMahesh Salgaonkar __func__, msg_type); 26324366360SMahesh Salgaonkar return -EINVAL; 26424366360SMahesh Salgaonkar } 26524366360SMahesh Salgaonkar return atomic_notifier_chain_register( 26624366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 26724366360SMahesh Salgaonkar } 26824366360SMahesh Salgaonkar 26924366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 27024366360SMahesh Salgaonkar { 27124366360SMahesh Salgaonkar /* notify subscribers */ 27224366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 27324366360SMahesh Salgaonkar msg_type, msg); 27424366360SMahesh Salgaonkar } 27524366360SMahesh Salgaonkar 27624366360SMahesh Salgaonkar static void opal_handle_message(void) 27724366360SMahesh Salgaonkar { 27824366360SMahesh Salgaonkar s64 ret; 27924366360SMahesh Salgaonkar /* 28024366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 28124366360SMahesh Salgaonkar * value in /proc/device-tree. 28224366360SMahesh Salgaonkar */ 28324366360SMahesh Salgaonkar static struct opal_msg msg; 284bb4398e1SAnton Blanchard u32 type; 28524366360SMahesh Salgaonkar 28624366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 28724366360SMahesh Salgaonkar /* No opal message pending. */ 28824366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 28924366360SMahesh Salgaonkar return; 29024366360SMahesh Salgaonkar 29124366360SMahesh Salgaonkar /* check for errors. */ 29224366360SMahesh Salgaonkar if (ret) { 29324366360SMahesh Salgaonkar pr_warning("%s: Failed to retrive opal message, err=%lld\n", 29424366360SMahesh Salgaonkar __func__, ret); 29524366360SMahesh Salgaonkar return; 29624366360SMahesh Salgaonkar } 29724366360SMahesh Salgaonkar 298bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 299bb4398e1SAnton Blanchard 30024366360SMahesh Salgaonkar /* Sanity check */ 301bb4398e1SAnton Blanchard if (type > OPAL_MSG_TYPE_MAX) { 302bb4398e1SAnton Blanchard pr_warning("%s: Unknown message type: %u\n", __func__, type); 30324366360SMahesh Salgaonkar return; 30424366360SMahesh Salgaonkar } 305bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 30624366360SMahesh Salgaonkar } 30724366360SMahesh Salgaonkar 30824366360SMahesh Salgaonkar static int opal_message_notify(struct notifier_block *nb, 30924366360SMahesh Salgaonkar unsigned long events, void *change) 31024366360SMahesh Salgaonkar { 31124366360SMahesh Salgaonkar if (events & OPAL_EVENT_MSG_PENDING) 31224366360SMahesh Salgaonkar opal_handle_message(); 31324366360SMahesh Salgaonkar return 0; 31424366360SMahesh Salgaonkar } 31524366360SMahesh Salgaonkar 31624366360SMahesh Salgaonkar static struct notifier_block opal_message_nb = { 31724366360SMahesh Salgaonkar .notifier_call = opal_message_notify, 31824366360SMahesh Salgaonkar .next = NULL, 31924366360SMahesh Salgaonkar .priority = 0, 32024366360SMahesh Salgaonkar }; 32124366360SMahesh Salgaonkar 32224366360SMahesh Salgaonkar static int __init opal_message_init(void) 32324366360SMahesh Salgaonkar { 32424366360SMahesh Salgaonkar int ret, i; 32524366360SMahesh Salgaonkar 32624366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 32724366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 32824366360SMahesh Salgaonkar 32924366360SMahesh Salgaonkar ret = opal_notifier_register(&opal_message_nb); 33024366360SMahesh Salgaonkar if (ret) { 33124366360SMahesh Salgaonkar pr_err("%s: Can't register OPAL event notifier (%d)\n", 33224366360SMahesh Salgaonkar __func__, ret); 33324366360SMahesh Salgaonkar return ret; 33424366360SMahesh Salgaonkar } 33524366360SMahesh Salgaonkar return 0; 33624366360SMahesh Salgaonkar } 33724366360SMahesh Salgaonkar early_initcall(opal_message_init); 33824366360SMahesh Salgaonkar 33914a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 34014a43e69SBenjamin Herrenschmidt { 3414f89363bSBenjamin Herrenschmidt s64 rc; 3424f89363bSBenjamin Herrenschmidt __be64 evt, len; 34314a43e69SBenjamin Herrenschmidt 34414a43e69SBenjamin Herrenschmidt if (!opal.entry) 345daea1175SBenjamin Herrenschmidt return -ENODEV; 34614a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3474f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 34814a43e69SBenjamin Herrenschmidt return 0; 3494f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 35014a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 35114a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3524f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 35314a43e69SBenjamin Herrenschmidt return 0; 35414a43e69SBenjamin Herrenschmidt } 35514a43e69SBenjamin Herrenschmidt 35614a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 35714a43e69SBenjamin Herrenschmidt { 35814a43e69SBenjamin Herrenschmidt int written = 0; 3594f89363bSBenjamin Herrenschmidt __be64 olen; 360daea1175SBenjamin Herrenschmidt s64 len, rc; 36114a43e69SBenjamin Herrenschmidt unsigned long flags; 3624f89363bSBenjamin Herrenschmidt __be64 evt; 36314a43e69SBenjamin Herrenschmidt 36414a43e69SBenjamin Herrenschmidt if (!opal.entry) 365daea1175SBenjamin Herrenschmidt return -ENODEV; 36614a43e69SBenjamin Herrenschmidt 36714a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 36814a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 369daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 370daea1175SBenjamin Herrenschmidt * 371daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 372daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 373daea1175SBenjamin Herrenschmidt * enough room and be done with it 37414a43e69SBenjamin Herrenschmidt */ 37514a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 376daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 3774f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3784f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 37914a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 38014a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 38114a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 38214a43e69SBenjamin Herrenschmidt if (rc) 38314a43e69SBenjamin Herrenschmidt return total_len; 3844f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 38514a43e69SBenjamin Herrenschmidt return -EAGAIN; 38614a43e69SBenjamin Herrenschmidt } 387daea1175SBenjamin Herrenschmidt } 38814a43e69SBenjamin Herrenschmidt 38914a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 39014a43e69SBenjamin Herrenschmidt * should no longer happen. 39114a43e69SBenjamin Herrenschmidt */ 392daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 39314a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 39414a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3954f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3964f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3974f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3981de1455fSBenjamin Herrenschmidt 3991de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 4001de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 4011de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 4021de1455fSBenjamin Herrenschmidt written = total_len; 4031de1455fSBenjamin Herrenschmidt break; 4041de1455fSBenjamin Herrenschmidt } 40514a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 40614a43e69SBenjamin Herrenschmidt total_len -= len; 40714a43e69SBenjamin Herrenschmidt data += len; 40814a43e69SBenjamin Herrenschmidt written += len; 40914a43e69SBenjamin Herrenschmidt } 41014a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 41114a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 41214a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 41314a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 41414a43e69SBenjamin Herrenschmidt */ 41514a43e69SBenjamin Herrenschmidt do 41614a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4174f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4184f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 41914a43e69SBenjamin Herrenschmidt } 42014a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 42114a43e69SBenjamin Herrenschmidt return written; 42214a43e69SBenjamin Herrenschmidt } 42314a43e69SBenjamin Herrenschmidt 424b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 425b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 426b63a0ffeSMahesh Salgaonkar { 427b63a0ffeSMahesh Salgaonkar int recovered = 0; 428b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 429b63a0ffeSMahesh Salgaonkar 430b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 431b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 432b63a0ffeSMahesh Salgaonkar recovered = 0; 433b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 434b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 435b63a0ffeSMahesh Salgaonkar recovered = 1; 436b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 437b63a0ffeSMahesh Salgaonkar /* 438b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 439b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 440b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 441b63a0ffeSMahesh Salgaonkar * in userspace. 442b63a0ffeSMahesh Salgaonkar * 443b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 444b63a0ffeSMahesh Salgaonkar */ 445b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 446b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 447b63a0ffeSMahesh Salgaonkar recovered = 1; 448b63a0ffeSMahesh Salgaonkar } else 449b63a0ffeSMahesh Salgaonkar recovered = 0; 450b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 451b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 452b63a0ffeSMahesh Salgaonkar /* 453b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 454b63a0ffeSMahesh Salgaonkar * kill the task. 455b63a0ffeSMahesh Salgaonkar */ 456b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 457b63a0ffeSMahesh Salgaonkar recovered = 1; 458b63a0ffeSMahesh Salgaonkar } 459b63a0ffeSMahesh Salgaonkar return recovered; 460b63a0ffeSMahesh Salgaonkar } 461b63a0ffeSMahesh Salgaonkar 462ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 463ed79ba9eSBenjamin Herrenschmidt { 46436df96f8SMahesh Salgaonkar struct machine_check_event evt; 465ed79ba9eSBenjamin Herrenschmidt 46636df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 46736df96f8SMahesh Salgaonkar return 0; 468ed79ba9eSBenjamin Herrenschmidt 469ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 47036df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 471ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 472ed79ba9eSBenjamin Herrenschmidt evt.version); 473ed79ba9eSBenjamin Herrenschmidt return 0; 474ed79ba9eSBenjamin Herrenschmidt } 475b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 476ed79ba9eSBenjamin Herrenschmidt 477b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 478b63a0ffeSMahesh Salgaonkar return 1; 479b63a0ffeSMahesh Salgaonkar return 0; 480ed79ba9eSBenjamin Herrenschmidt } 481ed79ba9eSBenjamin Herrenschmidt 48255672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 48355672ecfSMahesh Salgaonkar { 48455672ecfSMahesh Salgaonkar int i; 48555672ecfSMahesh Salgaonkar 48655672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 48755672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 48855672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 48955672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 49055672ecfSMahesh Salgaonkar return 0; 49155672ecfSMahesh Salgaonkar } 49255672ecfSMahesh Salgaonkar 49355672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 49455672ecfSMahesh Salgaonkar { 49555672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 49655672ecfSMahesh Salgaonkar 49755672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 49855672ecfSMahesh Salgaonkar goto out; 49955672ecfSMahesh Salgaonkar 50055672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 50155672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 50255672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 50355672ecfSMahesh Salgaonkar 50455672ecfSMahesh Salgaonkar /* 50555672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 50655672ecfSMahesh Salgaonkar */ 50755672ecfSMahesh Salgaonkar if (recover_addr) 50855672ecfSMahesh Salgaonkar regs->nip = recover_addr; 50955672ecfSMahesh Salgaonkar 51055672ecfSMahesh Salgaonkar out: 51155672ecfSMahesh Salgaonkar return !!recover_addr; 51255672ecfSMahesh Salgaonkar } 51355672ecfSMahesh Salgaonkar 514a125e092SBenjamin Herrenschmidt static irqreturn_t opal_interrupt(int irq, void *data) 515a125e092SBenjamin Herrenschmidt { 5165e4da530SAnton Blanchard __be64 events; 517a125e092SBenjamin Herrenschmidt 518a125e092SBenjamin Herrenschmidt opal_handle_interrupt(virq_to_hw(irq), &events); 519a125e092SBenjamin Herrenschmidt 5201bc98de2SGavin Shan opal_do_notifier(events); 521a125e092SBenjamin Herrenschmidt 522a125e092SBenjamin Herrenschmidt return IRQ_HANDLED; 523a125e092SBenjamin Herrenschmidt } 524a125e092SBenjamin Herrenschmidt 5256f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5266f68b5e2SVasant Hegde { 5276f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5286f68b5e2SVasant Hegde if (!opal_kobj) { 5296f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5306f68b5e2SVasant Hegde return -ENOMEM; 5316f68b5e2SVasant Hegde } 5326f68b5e2SVasant Hegde 5336f68b5e2SVasant Hegde return 0; 5346f68b5e2SVasant Hegde } 5356f68b5e2SVasant Hegde 53614a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 53714a43e69SBenjamin Herrenschmidt { 53814a43e69SBenjamin Herrenschmidt struct device_node *np, *consoles; 5391cc79bc8SAlistair Popple const __be32 *irqs; 540a125e092SBenjamin Herrenschmidt int rc, i, irqlen; 54114a43e69SBenjamin Herrenschmidt 54214a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 54314a43e69SBenjamin Herrenschmidt if (!opal_node) { 54414a43e69SBenjamin Herrenschmidt pr_warn("opal: Node not found\n"); 54514a43e69SBenjamin Herrenschmidt return -ENODEV; 54614a43e69SBenjamin Herrenschmidt } 5472db29d28SBenjamin Herrenschmidt 5482db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 54914a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 55014a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 55114a43e69SBenjamin Herrenschmidt else 55214a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 5532db29d28SBenjamin Herrenschmidt if (consoles) { 55414a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 55514a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 55614a43e69SBenjamin Herrenschmidt continue; 55714a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 55814a43e69SBenjamin Herrenschmidt } 55914a43e69SBenjamin Herrenschmidt of_node_put(consoles); 5602db29d28SBenjamin Herrenschmidt } 561a125e092SBenjamin Herrenschmidt 562a125e092SBenjamin Herrenschmidt /* Find all OPAL interrupts and request them */ 563a125e092SBenjamin Herrenschmidt irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 564a125e092SBenjamin Herrenschmidt pr_debug("opal: Found %d interrupts reserved for OPAL\n", 565a125e092SBenjamin Herrenschmidt irqs ? (irqlen / 4) : 0); 56673ed148aSBenjamin Herrenschmidt opal_irq_count = irqlen / 4; 56773ed148aSBenjamin Herrenschmidt opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 568a125e092SBenjamin Herrenschmidt for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { 569a125e092SBenjamin Herrenschmidt unsigned int hwirq = be32_to_cpup(irqs); 570a125e092SBenjamin Herrenschmidt unsigned int irq = irq_create_mapping(NULL, hwirq); 571a125e092SBenjamin Herrenschmidt if (irq == NO_IRQ) { 572a125e092SBenjamin Herrenschmidt pr_warning("opal: Failed to map irq 0x%x\n", hwirq); 573a125e092SBenjamin Herrenschmidt continue; 574a125e092SBenjamin Herrenschmidt } 575a125e092SBenjamin Herrenschmidt rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); 576a125e092SBenjamin Herrenschmidt if (rc) 577a125e092SBenjamin Herrenschmidt pr_warning("opal: Error %d requesting irq %d" 578a125e092SBenjamin Herrenschmidt " (0x%x)\n", rc, irq, hwirq); 57973ed148aSBenjamin Herrenschmidt opal_irqs[i] = irq; 580a125e092SBenjamin Herrenschmidt } 5816f68b5e2SVasant Hegde 5826f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 5836f68b5e2SVasant Hegde rc = opal_sysfs_init(); 58450bd6153SVasant Hegde if (rc == 0) { 585774fea1aSStewart Smith /* Setup error log interface */ 586774fea1aSStewart Smith rc = opal_elog_init(); 58750bd6153SVasant Hegde /* Setup code update interface */ 58850bd6153SVasant Hegde opal_flash_init(); 589c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 590c7e64b9cSStewart Smith opal_platform_dump_init(); 5914029cd66SNeelesh Gupta /* Setup system parameters interface */ 5924029cd66SNeelesh Gupta opal_sys_param_init(); 59350bd6153SVasant Hegde } 5946f68b5e2SVasant Hegde 59514a43e69SBenjamin Herrenschmidt return 0; 59614a43e69SBenjamin Herrenschmidt } 59714a43e69SBenjamin Herrenschmidt subsys_initcall(opal_init); 59873ed148aSBenjamin Herrenschmidt 59973ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 60073ed148aSBenjamin Herrenschmidt { 60173ed148aSBenjamin Herrenschmidt unsigned int i; 602f7d98d18SVasant Hegde long rc = OPAL_BUSY; 60373ed148aSBenjamin Herrenschmidt 604f7d98d18SVasant Hegde /* First free interrupts, which will also mask them */ 60573ed148aSBenjamin Herrenschmidt for (i = 0; i < opal_irq_count; i++) { 60673ed148aSBenjamin Herrenschmidt if (opal_irqs[i]) 607b0d436c7SAnton Blanchard free_irq(opal_irqs[i], NULL); 60873ed148aSBenjamin Herrenschmidt opal_irqs[i] = 0; 60973ed148aSBenjamin Herrenschmidt } 610f7d98d18SVasant Hegde 611f7d98d18SVasant Hegde /* 612f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 613f7d98d18SVasant Hegde * potentially write to our memory has completed such 614f7d98d18SVasant Hegde * as an ongoing dump retrieval 615f7d98d18SVasant Hegde */ 616f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 617f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 618f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 619f7d98d18SVasant Hegde opal_poll_events(NULL); 620f7d98d18SVasant Hegde else 621f7d98d18SVasant Hegde mdelay(10); 622f7d98d18SVasant Hegde } 62373ed148aSBenjamin Herrenschmidt } 624