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 49bfc36894SJoel Stanley 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 { 1056e556b47SMahesh Salgaonkar unsigned long i, psize, size; 10655672ecfSMahesh Salgaonkar const __be32 *prop; 10755672ecfSMahesh Salgaonkar 10855672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10955672ecfSMahesh Salgaonkar return 0; 11055672ecfSMahesh Salgaonkar 1116e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 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 /* 1196e556b47SMahesh Salgaonkar * Calculate number of available entries. 1206e556b47SMahesh Salgaonkar * 1216e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1226e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1236e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1246e556b47SMahesh Salgaonkar */ 1256e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1266e556b47SMahesh Salgaonkar 1276e556b47SMahesh Salgaonkar /* Sanity check */ 1286e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1296e556b47SMahesh Salgaonkar return 1; 1306e556b47SMahesh Salgaonkar 1316e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1326e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1336e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1346e556b47SMahesh Salgaonkar 1356e556b47SMahesh Salgaonkar /* 13655672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 13755672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 13855672ecfSMahesh Salgaonkar * RMO region. 13955672ecfSMahesh Salgaonkar */ 14055672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 14155672ecfSMahesh Salgaonkar ppc64_rma_size)); 14255672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 14355672ecfSMahesh Salgaonkar 1446e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 14555672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 14655672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 14755672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 14855672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 14955672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 15055672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 15155672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 15255672ecfSMahesh Salgaonkar 15355672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 15455672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 15555672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 15655672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 15755672ecfSMahesh Salgaonkar } 15855672ecfSMahesh Salgaonkar return 1; 15955672ecfSMahesh Salgaonkar } 16055672ecfSMahesh Salgaonkar 161c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 162c4463b37SJeremy Kerr { 16329186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 164c4463b37SJeremy Kerr u64 glue; 165c4463b37SJeremy Kerr 166c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 167c4463b37SJeremy Kerr return -ENODEV; 168c4463b37SJeremy Kerr 16928446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 17028446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 171ed79ba9eSBenjamin Herrenschmidt */ 172ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 173ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 174ed79ba9eSBenjamin Herrenschmidt 0, glue); 175ed79ba9eSBenjamin Herrenschmidt glue += 128; 176ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 17729186097SBenjamin Herrenschmidt #endif 178ed79ba9eSBenjamin Herrenschmidt 179c4463b37SJeremy Kerr return 0; 18014a43e69SBenjamin Herrenschmidt } 18114a43e69SBenjamin Herrenschmidt 182c4463b37SJeremy Kerr early_initcall(opal_register_exception_handlers); 183c4463b37SJeremy Kerr 1841bc98de2SGavin Shan int opal_notifier_register(struct notifier_block *nb) 1851bc98de2SGavin Shan { 1861bc98de2SGavin Shan if (!nb) { 1871bc98de2SGavin Shan pr_warning("%s: Invalid argument (%p)\n", 1881bc98de2SGavin Shan __func__, nb); 1891bc98de2SGavin Shan return -EINVAL; 1901bc98de2SGavin Shan } 1911bc98de2SGavin Shan 1921bc98de2SGavin Shan atomic_notifier_chain_register(&opal_notifier_head, nb); 1931bc98de2SGavin Shan return 0; 1941bc98de2SGavin Shan } 195798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_register); 196798af00cSBenjamin Herrenschmidt 197798af00cSBenjamin Herrenschmidt int opal_notifier_unregister(struct notifier_block *nb) 198798af00cSBenjamin Herrenschmidt { 199798af00cSBenjamin Herrenschmidt if (!nb) { 200798af00cSBenjamin Herrenschmidt pr_warning("%s: Invalid argument (%p)\n", 201798af00cSBenjamin Herrenschmidt __func__, nb); 202798af00cSBenjamin Herrenschmidt return -EINVAL; 203798af00cSBenjamin Herrenschmidt } 204798af00cSBenjamin Herrenschmidt 205798af00cSBenjamin Herrenschmidt atomic_notifier_chain_unregister(&opal_notifier_head, nb); 206798af00cSBenjamin Herrenschmidt return 0; 207798af00cSBenjamin Herrenschmidt } 208798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_unregister); 2091bc98de2SGavin Shan 2101bc98de2SGavin Shan static void opal_do_notifier(uint64_t events) 2111bc98de2SGavin Shan { 2121bc98de2SGavin Shan unsigned long flags; 2131bc98de2SGavin Shan uint64_t changed_mask; 2141bc98de2SGavin Shan 2151bc98de2SGavin Shan if (atomic_read(&opal_notifier_hold)) 2161bc98de2SGavin Shan return; 2171bc98de2SGavin Shan 2181bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2191bc98de2SGavin Shan changed_mask = last_notified_mask ^ events; 2201bc98de2SGavin Shan last_notified_mask = events; 2211bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2221bc98de2SGavin Shan 2231bc98de2SGavin Shan /* 2241bc98de2SGavin Shan * We feed with the event bits and changed bits for 2251bc98de2SGavin Shan * enough information to the callback. 2261bc98de2SGavin Shan */ 2271bc98de2SGavin Shan atomic_notifier_call_chain(&opal_notifier_head, 2281bc98de2SGavin Shan events, (void *)changed_mask); 2291bc98de2SGavin Shan } 2301bc98de2SGavin Shan 2311bc98de2SGavin Shan void opal_notifier_update_evt(uint64_t evt_mask, 2321bc98de2SGavin Shan uint64_t evt_val) 2331bc98de2SGavin Shan { 2341bc98de2SGavin Shan unsigned long flags; 2351bc98de2SGavin Shan 2361bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2371bc98de2SGavin Shan last_notified_mask &= ~evt_mask; 2381bc98de2SGavin Shan last_notified_mask |= evt_val; 2391bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2401bc98de2SGavin Shan } 2411bc98de2SGavin Shan 2421bc98de2SGavin Shan void opal_notifier_enable(void) 2431bc98de2SGavin Shan { 2441bc98de2SGavin Shan int64_t rc; 24556b4c993SAnton Blanchard __be64 evt = 0; 2461bc98de2SGavin Shan 2471bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 0); 2481bc98de2SGavin Shan 2491bc98de2SGavin Shan /* Process pending events */ 2501bc98de2SGavin Shan rc = opal_poll_events(&evt); 2511bc98de2SGavin Shan if (rc == OPAL_SUCCESS && evt) 25256b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(evt)); 2531bc98de2SGavin Shan } 2541bc98de2SGavin Shan 2551bc98de2SGavin Shan void opal_notifier_disable(void) 2561bc98de2SGavin Shan { 2571bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 1); 2581bc98de2SGavin Shan } 2591bc98de2SGavin Shan 26024366360SMahesh Salgaonkar /* 26124366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 26224366360SMahesh Salgaonkar * notified for specific messgae type. 26324366360SMahesh Salgaonkar */ 26424366360SMahesh Salgaonkar int opal_message_notifier_register(enum OpalMessageType msg_type, 26524366360SMahesh Salgaonkar struct notifier_block *nb) 26624366360SMahesh Salgaonkar { 26724366360SMahesh Salgaonkar if (!nb) { 26824366360SMahesh Salgaonkar pr_warning("%s: Invalid argument (%p)\n", 26924366360SMahesh Salgaonkar __func__, nb); 27024366360SMahesh Salgaonkar return -EINVAL; 27124366360SMahesh Salgaonkar } 27224366360SMahesh Salgaonkar if (msg_type > OPAL_MSG_TYPE_MAX) { 27324366360SMahesh Salgaonkar pr_warning("%s: Invalid message type argument (%d)\n", 27424366360SMahesh Salgaonkar __func__, msg_type); 27524366360SMahesh Salgaonkar return -EINVAL; 27624366360SMahesh Salgaonkar } 27724366360SMahesh Salgaonkar return atomic_notifier_chain_register( 27824366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 27924366360SMahesh Salgaonkar } 28024366360SMahesh Salgaonkar 28124366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 28224366360SMahesh Salgaonkar { 28324366360SMahesh Salgaonkar /* notify subscribers */ 28424366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 28524366360SMahesh Salgaonkar msg_type, msg); 28624366360SMahesh Salgaonkar } 28724366360SMahesh Salgaonkar 28824366360SMahesh Salgaonkar static void opal_handle_message(void) 28924366360SMahesh Salgaonkar { 29024366360SMahesh Salgaonkar s64 ret; 29124366360SMahesh Salgaonkar /* 29224366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 29324366360SMahesh Salgaonkar * value in /proc/device-tree. 29424366360SMahesh Salgaonkar */ 29524366360SMahesh Salgaonkar static struct opal_msg msg; 296bb4398e1SAnton Blanchard u32 type; 29724366360SMahesh Salgaonkar 29824366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 29924366360SMahesh Salgaonkar /* No opal message pending. */ 30024366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 30124366360SMahesh Salgaonkar return; 30224366360SMahesh Salgaonkar 30324366360SMahesh Salgaonkar /* check for errors. */ 30424366360SMahesh Salgaonkar if (ret) { 30524366360SMahesh Salgaonkar pr_warning("%s: Failed to retrive opal message, err=%lld\n", 30624366360SMahesh Salgaonkar __func__, ret); 30724366360SMahesh Salgaonkar return; 30824366360SMahesh Salgaonkar } 30924366360SMahesh Salgaonkar 310bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 311bb4398e1SAnton Blanchard 31224366360SMahesh Salgaonkar /* Sanity check */ 313bb4398e1SAnton Blanchard if (type > OPAL_MSG_TYPE_MAX) { 314bb4398e1SAnton Blanchard pr_warning("%s: Unknown message type: %u\n", __func__, type); 31524366360SMahesh Salgaonkar return; 31624366360SMahesh Salgaonkar } 317bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 31824366360SMahesh Salgaonkar } 31924366360SMahesh Salgaonkar 32024366360SMahesh Salgaonkar static int opal_message_notify(struct notifier_block *nb, 32124366360SMahesh Salgaonkar unsigned long events, void *change) 32224366360SMahesh Salgaonkar { 32324366360SMahesh Salgaonkar if (events & OPAL_EVENT_MSG_PENDING) 32424366360SMahesh Salgaonkar opal_handle_message(); 32524366360SMahesh Salgaonkar return 0; 32624366360SMahesh Salgaonkar } 32724366360SMahesh Salgaonkar 32824366360SMahesh Salgaonkar static struct notifier_block opal_message_nb = { 32924366360SMahesh Salgaonkar .notifier_call = opal_message_notify, 33024366360SMahesh Salgaonkar .next = NULL, 33124366360SMahesh Salgaonkar .priority = 0, 33224366360SMahesh Salgaonkar }; 33324366360SMahesh Salgaonkar 33424366360SMahesh Salgaonkar static int __init opal_message_init(void) 33524366360SMahesh Salgaonkar { 33624366360SMahesh Salgaonkar int ret, i; 33724366360SMahesh Salgaonkar 33824366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 33924366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 34024366360SMahesh Salgaonkar 34124366360SMahesh Salgaonkar ret = opal_notifier_register(&opal_message_nb); 34224366360SMahesh Salgaonkar if (ret) { 34324366360SMahesh Salgaonkar pr_err("%s: Can't register OPAL event notifier (%d)\n", 34424366360SMahesh Salgaonkar __func__, ret); 34524366360SMahesh Salgaonkar return ret; 34624366360SMahesh Salgaonkar } 34724366360SMahesh Salgaonkar return 0; 34824366360SMahesh Salgaonkar } 34924366360SMahesh Salgaonkar early_initcall(opal_message_init); 35024366360SMahesh Salgaonkar 35114a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 35214a43e69SBenjamin Herrenschmidt { 3534f89363bSBenjamin Herrenschmidt s64 rc; 3544f89363bSBenjamin Herrenschmidt __be64 evt, len; 35514a43e69SBenjamin Herrenschmidt 35614a43e69SBenjamin Herrenschmidt if (!opal.entry) 357daea1175SBenjamin Herrenschmidt return -ENODEV; 35814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3594f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 36014a43e69SBenjamin Herrenschmidt return 0; 3614f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 36214a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 36314a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3644f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 36514a43e69SBenjamin Herrenschmidt return 0; 36614a43e69SBenjamin Herrenschmidt } 36714a43e69SBenjamin Herrenschmidt 36814a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 36914a43e69SBenjamin Herrenschmidt { 37014a43e69SBenjamin Herrenschmidt int written = 0; 3714f89363bSBenjamin Herrenschmidt __be64 olen; 372daea1175SBenjamin Herrenschmidt s64 len, rc; 37314a43e69SBenjamin Herrenschmidt unsigned long flags; 3744f89363bSBenjamin Herrenschmidt __be64 evt; 37514a43e69SBenjamin Herrenschmidt 37614a43e69SBenjamin Herrenschmidt if (!opal.entry) 377daea1175SBenjamin Herrenschmidt return -ENODEV; 37814a43e69SBenjamin Herrenschmidt 37914a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 38014a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 381daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 382daea1175SBenjamin Herrenschmidt * 383daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 384daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 385daea1175SBenjamin Herrenschmidt * enough room and be done with it 38614a43e69SBenjamin Herrenschmidt */ 38714a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 388daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 3894f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3904f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 39114a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 39214a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 39314a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 39414a43e69SBenjamin Herrenschmidt if (rc) 39514a43e69SBenjamin Herrenschmidt return total_len; 3964f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 39714a43e69SBenjamin Herrenschmidt return -EAGAIN; 39814a43e69SBenjamin Herrenschmidt } 399daea1175SBenjamin Herrenschmidt } 40014a43e69SBenjamin Herrenschmidt 40114a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 40214a43e69SBenjamin Herrenschmidt * should no longer happen. 40314a43e69SBenjamin Herrenschmidt */ 404daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 40514a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 40614a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 4074f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 4084f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 4094f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 4101de1455fSBenjamin Herrenschmidt 4111de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 4121de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 4131de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 4141de1455fSBenjamin Herrenschmidt written = total_len; 4151de1455fSBenjamin Herrenschmidt break; 4161de1455fSBenjamin Herrenschmidt } 41714a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 41814a43e69SBenjamin Herrenschmidt total_len -= len; 41914a43e69SBenjamin Herrenschmidt data += len; 42014a43e69SBenjamin Herrenschmidt written += len; 42114a43e69SBenjamin Herrenschmidt } 42214a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 42314a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 42414a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 42514a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 42614a43e69SBenjamin Herrenschmidt */ 42714a43e69SBenjamin Herrenschmidt do 42814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4294f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4304f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 43114a43e69SBenjamin Herrenschmidt } 43214a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 43314a43e69SBenjamin Herrenschmidt return written; 43414a43e69SBenjamin Herrenschmidt } 43514a43e69SBenjamin Herrenschmidt 436b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 437b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 438b63a0ffeSMahesh Salgaonkar { 439b63a0ffeSMahesh Salgaonkar int recovered = 0; 440b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 441b63a0ffeSMahesh Salgaonkar 442b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 443b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 444b63a0ffeSMahesh Salgaonkar recovered = 0; 445b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 446b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 447b63a0ffeSMahesh Salgaonkar recovered = 1; 448b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 449b63a0ffeSMahesh Salgaonkar /* 450b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 451b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 452b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 453b63a0ffeSMahesh Salgaonkar * in userspace. 454b63a0ffeSMahesh Salgaonkar * 455b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 456b63a0ffeSMahesh Salgaonkar */ 457b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 458b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 459b63a0ffeSMahesh Salgaonkar recovered = 1; 460b63a0ffeSMahesh Salgaonkar } else 461b63a0ffeSMahesh Salgaonkar recovered = 0; 462b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 463b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 464b63a0ffeSMahesh Salgaonkar /* 465b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 466b63a0ffeSMahesh Salgaonkar * kill the task. 467b63a0ffeSMahesh Salgaonkar */ 468b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 469b63a0ffeSMahesh Salgaonkar recovered = 1; 470b63a0ffeSMahesh Salgaonkar } 471b63a0ffeSMahesh Salgaonkar return recovered; 472b63a0ffeSMahesh Salgaonkar } 473b63a0ffeSMahesh Salgaonkar 474ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 475ed79ba9eSBenjamin Herrenschmidt { 47636df96f8SMahesh Salgaonkar struct machine_check_event evt; 477ed79ba9eSBenjamin Herrenschmidt 47836df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 47936df96f8SMahesh Salgaonkar return 0; 480ed79ba9eSBenjamin Herrenschmidt 481ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 48236df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 483ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 484ed79ba9eSBenjamin Herrenschmidt evt.version); 485ed79ba9eSBenjamin Herrenschmidt return 0; 486ed79ba9eSBenjamin Herrenschmidt } 487b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 488ed79ba9eSBenjamin Herrenschmidt 489b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 490b63a0ffeSMahesh Salgaonkar return 1; 491b63a0ffeSMahesh Salgaonkar return 0; 492ed79ba9eSBenjamin Herrenschmidt } 493ed79ba9eSBenjamin Herrenschmidt 49455672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 49555672ecfSMahesh Salgaonkar { 49655672ecfSMahesh Salgaonkar int i; 49755672ecfSMahesh Salgaonkar 49855672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 49955672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 50055672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 50155672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 50255672ecfSMahesh Salgaonkar return 0; 50355672ecfSMahesh Salgaonkar } 50455672ecfSMahesh Salgaonkar 50555672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 50655672ecfSMahesh Salgaonkar { 50755672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 50855672ecfSMahesh Salgaonkar 50955672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 51055672ecfSMahesh Salgaonkar goto out; 51155672ecfSMahesh Salgaonkar 51255672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 51355672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 51455672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 51555672ecfSMahesh Salgaonkar 51655672ecfSMahesh Salgaonkar /* 51755672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 51855672ecfSMahesh Salgaonkar */ 51955672ecfSMahesh Salgaonkar if (recover_addr) 52055672ecfSMahesh Salgaonkar regs->nip = recover_addr; 52155672ecfSMahesh Salgaonkar 52255672ecfSMahesh Salgaonkar out: 52355672ecfSMahesh Salgaonkar return !!recover_addr; 52455672ecfSMahesh Salgaonkar } 52555672ecfSMahesh Salgaonkar 526a125e092SBenjamin Herrenschmidt static irqreturn_t opal_interrupt(int irq, void *data) 527a125e092SBenjamin Herrenschmidt { 5285e4da530SAnton Blanchard __be64 events; 529a125e092SBenjamin Herrenschmidt 530a125e092SBenjamin Herrenschmidt opal_handle_interrupt(virq_to_hw(irq), &events); 531a125e092SBenjamin Herrenschmidt 53256b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(events)); 533a125e092SBenjamin Herrenschmidt 534a125e092SBenjamin Herrenschmidt return IRQ_HANDLED; 535a125e092SBenjamin Herrenschmidt } 536a125e092SBenjamin Herrenschmidt 5376f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5386f68b5e2SVasant Hegde { 5396f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5406f68b5e2SVasant Hegde if (!opal_kobj) { 5416f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5426f68b5e2SVasant Hegde return -ENOMEM; 5436f68b5e2SVasant Hegde } 5446f68b5e2SVasant Hegde 5456f68b5e2SVasant Hegde return 0; 5466f68b5e2SVasant Hegde } 5476f68b5e2SVasant Hegde 54814a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 54914a43e69SBenjamin Herrenschmidt { 55014a43e69SBenjamin Herrenschmidt struct device_node *np, *consoles; 5511cc79bc8SAlistair Popple const __be32 *irqs; 552a125e092SBenjamin Herrenschmidt int rc, i, irqlen; 55314a43e69SBenjamin Herrenschmidt 55414a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 55514a43e69SBenjamin Herrenschmidt if (!opal_node) { 55614a43e69SBenjamin Herrenschmidt pr_warn("opal: Node not found\n"); 55714a43e69SBenjamin Herrenschmidt return -ENODEV; 55814a43e69SBenjamin Herrenschmidt } 5592db29d28SBenjamin Herrenschmidt 5602db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 56114a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 56214a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 56314a43e69SBenjamin Herrenschmidt else 56414a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 5652db29d28SBenjamin Herrenschmidt if (consoles) { 56614a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 56714a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 56814a43e69SBenjamin Herrenschmidt continue; 56914a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 57014a43e69SBenjamin Herrenschmidt } 57114a43e69SBenjamin Herrenschmidt of_node_put(consoles); 5722db29d28SBenjamin Herrenschmidt } 573a125e092SBenjamin Herrenschmidt 574a125e092SBenjamin Herrenschmidt /* Find all OPAL interrupts and request them */ 575a125e092SBenjamin Herrenschmidt irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 576a125e092SBenjamin Herrenschmidt pr_debug("opal: Found %d interrupts reserved for OPAL\n", 577a125e092SBenjamin Herrenschmidt irqs ? (irqlen / 4) : 0); 57873ed148aSBenjamin Herrenschmidt opal_irq_count = irqlen / 4; 57973ed148aSBenjamin Herrenschmidt opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 580a125e092SBenjamin Herrenschmidt for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { 581a125e092SBenjamin Herrenschmidt unsigned int hwirq = be32_to_cpup(irqs); 582a125e092SBenjamin Herrenschmidt unsigned int irq = irq_create_mapping(NULL, hwirq); 583a125e092SBenjamin Herrenschmidt if (irq == NO_IRQ) { 584a125e092SBenjamin Herrenschmidt pr_warning("opal: Failed to map irq 0x%x\n", hwirq); 585a125e092SBenjamin Herrenschmidt continue; 586a125e092SBenjamin Herrenschmidt } 587a125e092SBenjamin Herrenschmidt rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); 588a125e092SBenjamin Herrenschmidt if (rc) 589a125e092SBenjamin Herrenschmidt pr_warning("opal: Error %d requesting irq %d" 590a125e092SBenjamin Herrenschmidt " (0x%x)\n", rc, irq, hwirq); 59173ed148aSBenjamin Herrenschmidt opal_irqs[i] = irq; 592a125e092SBenjamin Herrenschmidt } 5936f68b5e2SVasant Hegde 5946f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 5956f68b5e2SVasant Hegde rc = opal_sysfs_init(); 59650bd6153SVasant Hegde if (rc == 0) { 597774fea1aSStewart Smith /* Setup error log interface */ 598774fea1aSStewart Smith rc = opal_elog_init(); 59950bd6153SVasant Hegde /* Setup code update interface */ 60050bd6153SVasant Hegde opal_flash_init(); 601c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 602c7e64b9cSStewart Smith opal_platform_dump_init(); 6034029cd66SNeelesh Gupta /* Setup system parameters interface */ 6044029cd66SNeelesh Gupta opal_sys_param_init(); 605bfc36894SJoel Stanley /* Setup message log interface. */ 606bfc36894SJoel Stanley opal_msglog_init(); 60750bd6153SVasant Hegde } 6086f68b5e2SVasant Hegde 60914a43e69SBenjamin Herrenschmidt return 0; 61014a43e69SBenjamin Herrenschmidt } 61114a43e69SBenjamin Herrenschmidt subsys_initcall(opal_init); 61273ed148aSBenjamin Herrenschmidt 61373ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 61473ed148aSBenjamin Herrenschmidt { 61573ed148aSBenjamin Herrenschmidt unsigned int i; 616f7d98d18SVasant Hegde long rc = OPAL_BUSY; 61773ed148aSBenjamin Herrenschmidt 618f7d98d18SVasant Hegde /* First free interrupts, which will also mask them */ 61973ed148aSBenjamin Herrenschmidt for (i = 0; i < opal_irq_count; i++) { 62073ed148aSBenjamin Herrenschmidt if (opal_irqs[i]) 621b0d436c7SAnton Blanchard free_irq(opal_irqs[i], NULL); 62273ed148aSBenjamin Herrenschmidt opal_irqs[i] = 0; 62373ed148aSBenjamin Herrenschmidt } 624f7d98d18SVasant Hegde 625f7d98d18SVasant Hegde /* 626f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 627f7d98d18SVasant Hegde * potentially write to our memory has completed such 628f7d98d18SVasant Hegde * as an ongoing dump retrieval 629f7d98d18SVasant Hegde */ 630f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 631f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 632f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 633f7d98d18SVasant Hegde opal_poll_events(NULL); 634f7d98d18SVasant Hegde else 635f7d98d18SVasant Hegde mdelay(10); 636f7d98d18SVasant Hegde } 63773ed148aSBenjamin Herrenschmidt } 638e28b05e7SJoel Stanley 639e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 640e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 641