12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 214a43e69SBenjamin Herrenschmidt /* 314a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 414a43e69SBenjamin Herrenschmidt * 514a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 614a43e69SBenjamin Herrenschmidt */ 714a43e69SBenjamin Herrenschmidt 8c8742f85SBenjamin Herrenschmidt #define pr_fmt(fmt) "opal: " fmt 914a43e69SBenjamin Herrenschmidt 10c8742f85SBenjamin Herrenschmidt #include <linux/printk.h> 1114a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1214a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1326a2056eSRob Herring #include <linux/of_fdt.h> 1414a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 158f95faaaSMadhavan Srinivasan #include <linux/of_address.h> 16a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 171bc98de2SGavin Shan #include <linux/notifier.h> 1873ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 19b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 206f68b5e2SVasant Hegde #include <linux/kobject.h> 21f7d98d18SVasant Hegde #include <linux/delay.h> 2255672ecfSMahesh Salgaonkar #include <linux/memblock.h> 233bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 243bf57561SBenjamin Herrenschmidt #include <linux/freezer.h> 25b746e3e0SNicholas Piggin #include <linux/kmsg_dump.h> 26b746e3e0SNicholas Piggin #include <linux/console.h> 27b746e3e0SNicholas Piggin #include <linux/sched/debug.h> 28b14726c5SMichael Ellerman 29b14726c5SMichael Ellerman #include <asm/machdep.h> 3014a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 3114a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3236df96f8SMahesh Salgaonkar #include <asm/mce.h> 338f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 346fcd6baaSNicholas Piggin #include <asm/bug.h> 3514a43e69SBenjamin Herrenschmidt 3614a43e69SBenjamin Herrenschmidt #include "powernv.h" 3714a43e69SBenjamin Herrenschmidt 38a9336ddfSDeb McLemore #define OPAL_MSG_QUEUE_MAX 16 39a9336ddfSDeb McLemore 40a9336ddfSDeb McLemore struct opal_msg_node { 41a9336ddfSDeb McLemore struct list_head list; 42a9336ddfSDeb McLemore struct opal_msg msg; 43a9336ddfSDeb McLemore }; 44a9336ddfSDeb McLemore 45a9336ddfSDeb McLemore static DEFINE_SPINLOCK(msg_list_lock); 46a9336ddfSDeb McLemore static LIST_HEAD(msg_list); 47a9336ddfSDeb McLemore 486f68b5e2SVasant Hegde /* /sys/firmware/opal */ 496f68b5e2SVasant Hegde struct kobject *opal_kobj; 506f68b5e2SVasant Hegde 5114a43e69SBenjamin Herrenschmidt struct opal { 5214a43e69SBenjamin Herrenschmidt u64 base; 5314a43e69SBenjamin Herrenschmidt u64 entry; 5455672ecfSMahesh Salgaonkar u64 size; 5514a43e69SBenjamin Herrenschmidt } opal; 5614a43e69SBenjamin Herrenschmidt 5755672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 5855672ecfSMahesh Salgaonkar u64 start_addr; 5955672ecfSMahesh Salgaonkar u64 end_addr; 6055672ecfSMahesh Salgaonkar u64 recover_addr; 6155672ecfSMahesh Salgaonkar }; 6255672ecfSMahesh Salgaonkar 63a9336ddfSDeb McLemore static int msg_list_size; 64a9336ddfSDeb McLemore 6555672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 6655672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 6755672ecfSMahesh Salgaonkar 68bfc36894SJoel Stanley struct device_node *opal_node; 6914a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 7024366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 713bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 72a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 732be1d5d1SVasant Hegde static struct opal_msg *opal_msg; 742be1d5d1SVasant Hegde static u32 opal_msg_size __ro_after_init; 7514a43e69SBenjamin Herrenschmidt 76*e5913db1SNick Child void __init opal_configure_cores(void) 774926616cSBenjamin Herrenschmidt { 781c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 791c0eaf0fSBenjamin Herrenschmidt 804926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 814926616cSBenjamin Herrenschmidt * 824926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 834926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 844926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 854926616cSBenjamin Herrenschmidt */ 864926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 871c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 884926616cSBenjamin Herrenschmidt #else 891c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 904926616cSBenjamin Herrenschmidt #endif 91d3cbff1bSBenjamin Herrenschmidt 921c0eaf0fSBenjamin Herrenschmidt /* 931c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 941c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 951c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 961c0eaf0fSBenjamin Herrenschmidt */ 97a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 981c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 991c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 1001c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 1011c0eaf0fSBenjamin Herrenschmidt } 1021c0eaf0fSBenjamin Herrenschmidt 1031c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 1041c0eaf0fSBenjamin Herrenschmidt 105d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 106d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 107d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 1084926616cSBenjamin Herrenschmidt } 1094926616cSBenjamin Herrenschmidt 11014a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 11114a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 11214a43e69SBenjamin Herrenschmidt { 11355672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 1149d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 11514a43e69SBenjamin Herrenschmidt 11614a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 11714a43e69SBenjamin Herrenschmidt return 0; 11814a43e69SBenjamin Herrenschmidt 11914a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 12014a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 12155672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 12214a43e69SBenjamin Herrenschmidt 12355672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 12414a43e69SBenjamin Herrenschmidt return 1; 12514a43e69SBenjamin Herrenschmidt 12614a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 12714a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 12855672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 12914a43e69SBenjamin Herrenschmidt 1309d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 13114a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1329d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 13314a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1349d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 13555672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 13614a43e69SBenjamin Herrenschmidt 13775b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 138e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 1395138b314SBenjamin Herrenschmidt pr_debug("OPAL detected !\n"); 14014a43e69SBenjamin Herrenschmidt } else { 141786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 14214a43e69SBenjamin Herrenschmidt } 14314a43e69SBenjamin Herrenschmidt 144c4463b37SJeremy Kerr return 1; 145c4463b37SJeremy Kerr } 146c4463b37SJeremy Kerr 14755672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 14855672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 14955672ecfSMahesh Salgaonkar { 1509d0c4dfeSRob Herring int i, psize, size; 15155672ecfSMahesh Salgaonkar const __be32 *prop; 15255672ecfSMahesh Salgaonkar 15355672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 15455672ecfSMahesh Salgaonkar return 0; 15555672ecfSMahesh Salgaonkar 1566e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 15755672ecfSMahesh Salgaonkar 15855672ecfSMahesh Salgaonkar if (!prop) 15955672ecfSMahesh Salgaonkar return 1; 16055672ecfSMahesh Salgaonkar 16155672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 16255672ecfSMahesh Salgaonkar 16355672ecfSMahesh Salgaonkar /* 1646e556b47SMahesh Salgaonkar * Calculate number of available entries. 1656e556b47SMahesh Salgaonkar * 1666e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1676e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1686e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1696e556b47SMahesh Salgaonkar */ 1706e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1716e556b47SMahesh Salgaonkar 1726e556b47SMahesh Salgaonkar /* Sanity check */ 1736e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1746e556b47SMahesh Salgaonkar return 1; 1756e556b47SMahesh Salgaonkar 1766e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1776e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1786e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1796e556b47SMahesh Salgaonkar 1806e556b47SMahesh Salgaonkar /* 18176b42e28SNicholas Piggin * Allocate a buffer to hold the MC recoverable ranges. 18255672ecfSMahesh Salgaonkar */ 183b63a07d6SMike Rapoport mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); 1848a7f97b9SMike Rapoport if (!mc_recoverable_range) 1858a7f97b9SMike Rapoport panic("%s: Failed to allocate %u bytes align=0x%lx\n", 1868a7f97b9SMike Rapoport __func__, size, __alignof__(u64)); 18755672ecfSMahesh Salgaonkar 1886e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 18955672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 19055672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 19155672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 19255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 19355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 19455672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 19555672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 19655672ecfSMahesh Salgaonkar 19755672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 19855672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 19955672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 20055672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 20155672ecfSMahesh Salgaonkar } 20255672ecfSMahesh Salgaonkar return 1; 20355672ecfSMahesh Salgaonkar } 20455672ecfSMahesh Salgaonkar 205c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 206c4463b37SJeremy Kerr { 20729186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 208c4463b37SJeremy Kerr u64 glue; 209c4463b37SJeremy Kerr 210c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 211c4463b37SJeremy Kerr return -ENODEV; 212c4463b37SJeremy Kerr 21328446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 21428446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 215ed79ba9eSBenjamin Herrenschmidt */ 216ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2176507955cSMahesh Salgaonkar 2186507955cSMahesh Salgaonkar /* 2191549c42dSStewart Smith * Only ancient OPAL firmware requires this. 2201549c42dSStewart Smith * Specifically, firmware from FW810.00 (released June 2014) 2211549c42dSStewart Smith * through FW810.20 (Released October 2014). 2226507955cSMahesh Salgaonkar * 2231549c42dSStewart Smith * Check if we are running on newer (post Oct 2014) firmware that 2241549c42dSStewart Smith * exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to 2251549c42dSStewart Smith * patch the HMI interrupt and we catch it directly in Linux. 2266507955cSMahesh Salgaonkar * 2271549c42dSStewart Smith * For older firmware (i.e < FW810.20), we fallback to old behavior and 2281549c42dSStewart Smith * let OPAL patch the HMI vector and handle it inside OPAL firmware. 2291549c42dSStewart Smith * 2301549c42dSStewart Smith * For newer firmware we catch/handle the HMI directly in Linux. 2316507955cSMahesh Salgaonkar */ 2326507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 23308135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2346507955cSMahesh Salgaonkar opal_register_exception_handler( 2356507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2366507955cSMahesh Salgaonkar 0, glue); 2376507955cSMahesh Salgaonkar glue += 128; 2386507955cSMahesh Salgaonkar } 2396507955cSMahesh Salgaonkar 2401549c42dSStewart Smith /* 2411549c42dSStewart Smith * Only applicable to ancient firmware, all modern 2421549c42dSStewart Smith * (post March 2015/skiboot 5.0) firmware will just return 2431549c42dSStewart Smith * OPAL_UNSUPPORTED. 2441549c42dSStewart Smith */ 245ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 24629186097SBenjamin Herrenschmidt #endif 247ed79ba9eSBenjamin Herrenschmidt 248c4463b37SJeremy Kerr return 0; 24914a43e69SBenjamin Herrenschmidt } 250b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 251c4463b37SJeremy Kerr 252a9336ddfSDeb McLemore static void queue_replay_msg(void *msg) 253a9336ddfSDeb McLemore { 254a9336ddfSDeb McLemore struct opal_msg_node *msg_node; 255a9336ddfSDeb McLemore 256a9336ddfSDeb McLemore if (msg_list_size < OPAL_MSG_QUEUE_MAX) { 257a9336ddfSDeb McLemore msg_node = kzalloc(sizeof(*msg_node), GFP_ATOMIC); 258a9336ddfSDeb McLemore if (msg_node) { 259a9336ddfSDeb McLemore INIT_LIST_HEAD(&msg_node->list); 260a9336ddfSDeb McLemore memcpy(&msg_node->msg, msg, sizeof(struct opal_msg)); 261a9336ddfSDeb McLemore list_add_tail(&msg_node->list, &msg_list); 262a9336ddfSDeb McLemore msg_list_size++; 263a9336ddfSDeb McLemore } else 264a9336ddfSDeb McLemore pr_warn_once("message queue no memory\n"); 265a9336ddfSDeb McLemore 266a9336ddfSDeb McLemore if (msg_list_size >= OPAL_MSG_QUEUE_MAX) 267a9336ddfSDeb McLemore pr_warn_once("message queue full\n"); 268a9336ddfSDeb McLemore } 269a9336ddfSDeb McLemore } 270a9336ddfSDeb McLemore 271a9336ddfSDeb McLemore static void dequeue_replay_msg(enum opal_msg_type msg_type) 272a9336ddfSDeb McLemore { 273a9336ddfSDeb McLemore struct opal_msg_node *msg_node, *tmp; 274a9336ddfSDeb McLemore 275a9336ddfSDeb McLemore list_for_each_entry_safe(msg_node, tmp, &msg_list, list) { 276a9336ddfSDeb McLemore if (be32_to_cpu(msg_node->msg.msg_type) != msg_type) 277a9336ddfSDeb McLemore continue; 278a9336ddfSDeb McLemore 279a9336ddfSDeb McLemore atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 280a9336ddfSDeb McLemore msg_type, 281a9336ddfSDeb McLemore &msg_node->msg); 282a9336ddfSDeb McLemore 283a9336ddfSDeb McLemore list_del(&msg_node->list); 284a9336ddfSDeb McLemore kfree(msg_node); 285a9336ddfSDeb McLemore msg_list_size--; 286a9336ddfSDeb McLemore } 287a9336ddfSDeb McLemore } 288a9336ddfSDeb McLemore 28924366360SMahesh Salgaonkar /* 29024366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 29124366360SMahesh Salgaonkar * notified for specific messgae type. 29224366360SMahesh Salgaonkar */ 293d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 29424366360SMahesh Salgaonkar struct notifier_block *nb) 29524366360SMahesh Salgaonkar { 296a9336ddfSDeb McLemore int ret; 297a9336ddfSDeb McLemore unsigned long flags; 298a9336ddfSDeb McLemore 299792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 300f2c2cbccSJoe Perches pr_warn("%s: Invalid arguments, msg_type:%d\n", 30124366360SMahesh Salgaonkar __func__, msg_type); 30224366360SMahesh Salgaonkar return -EINVAL; 30324366360SMahesh Salgaonkar } 304792f96e9SNeelesh Gupta 305a9336ddfSDeb McLemore spin_lock_irqsave(&msg_list_lock, flags); 306a9336ddfSDeb McLemore ret = atomic_notifier_chain_register( 30724366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 308a9336ddfSDeb McLemore 309a9336ddfSDeb McLemore /* 310a9336ddfSDeb McLemore * If the registration succeeded, replay any queued messages that came 311a9336ddfSDeb McLemore * in prior to the notifier chain registration. msg_list_lock held here 312a9336ddfSDeb McLemore * to ensure they're delivered prior to any subsequent messages. 313a9336ddfSDeb McLemore */ 314a9336ddfSDeb McLemore if (ret == 0) 315a9336ddfSDeb McLemore dequeue_replay_msg(msg_type); 316a9336ddfSDeb McLemore 317a9336ddfSDeb McLemore spin_unlock_irqrestore(&msg_list_lock, flags); 318a9336ddfSDeb McLemore 319a9336ddfSDeb McLemore return ret; 32024366360SMahesh Salgaonkar } 321594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 32224366360SMahesh Salgaonkar 323df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 324b921e902SNeelesh Gupta struct notifier_block *nb) 325b921e902SNeelesh Gupta { 326b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 327b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 328b921e902SNeelesh Gupta } 329594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 330b921e902SNeelesh Gupta 33124366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 33224366360SMahesh Salgaonkar { 333a9336ddfSDeb McLemore unsigned long flags; 334a9336ddfSDeb McLemore bool queued = false; 335a9336ddfSDeb McLemore 336a9336ddfSDeb McLemore spin_lock_irqsave(&msg_list_lock, flags); 337a9336ddfSDeb McLemore if (opal_msg_notifier_head[msg_type].head == NULL) { 338a9336ddfSDeb McLemore /* 339a9336ddfSDeb McLemore * Queue up the msg since no notifiers have registered 340a9336ddfSDeb McLemore * yet for this msg_type. 341a9336ddfSDeb McLemore */ 342a9336ddfSDeb McLemore queue_replay_msg(msg); 343a9336ddfSDeb McLemore queued = true; 344a9336ddfSDeb McLemore } 345a9336ddfSDeb McLemore spin_unlock_irqrestore(&msg_list_lock, flags); 346a9336ddfSDeb McLemore 347a9336ddfSDeb McLemore if (queued) 348a9336ddfSDeb McLemore return; 349a9336ddfSDeb McLemore 35024366360SMahesh Salgaonkar /* notify subscribers */ 35124366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 35224366360SMahesh Salgaonkar msg_type, msg); 35324366360SMahesh Salgaonkar } 35424366360SMahesh Salgaonkar 35524366360SMahesh Salgaonkar static void opal_handle_message(void) 35624366360SMahesh Salgaonkar { 35724366360SMahesh Salgaonkar s64 ret; 358bb4398e1SAnton Blanchard u32 type; 35924366360SMahesh Salgaonkar 3602be1d5d1SVasant Hegde ret = opal_get_msg(__pa(opal_msg), opal_msg_size); 36124366360SMahesh Salgaonkar /* No opal message pending. */ 36224366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 36324366360SMahesh Salgaonkar return; 36424366360SMahesh Salgaonkar 36524366360SMahesh Salgaonkar /* check for errors. */ 36624366360SMahesh Salgaonkar if (ret) { 367f2c2cbccSJoe Perches pr_warn("%s: Failed to retrieve opal message, err=%lld\n", 36824366360SMahesh Salgaonkar __func__, ret); 36924366360SMahesh Salgaonkar return; 37024366360SMahesh Salgaonkar } 37124366360SMahesh Salgaonkar 3722be1d5d1SVasant Hegde type = be32_to_cpu(opal_msg->msg_type); 373bb4398e1SAnton Blanchard 37424366360SMahesh Salgaonkar /* Sanity check */ 375792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 37698da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 37724366360SMahesh Salgaonkar return; 37824366360SMahesh Salgaonkar } 3792be1d5d1SVasant Hegde opal_message_do_notify(type, (void *)opal_msg); 38024366360SMahesh Salgaonkar } 38124366360SMahesh Salgaonkar 382a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 38324366360SMahesh Salgaonkar { 38424366360SMahesh Salgaonkar opal_handle_message(); 385a295af24SAlistair Popple return IRQ_HANDLED; 38624366360SMahesh Salgaonkar } 38724366360SMahesh Salgaonkar 3882be1d5d1SVasant Hegde static int __init opal_message_init(struct device_node *opal_node) 38924366360SMahesh Salgaonkar { 390a295af24SAlistair Popple int ret, i, irq; 39124366360SMahesh Salgaonkar 3922be1d5d1SVasant Hegde ret = of_property_read_u32(opal_node, "opal-msg-size", &opal_msg_size); 3932be1d5d1SVasant Hegde if (ret) { 3942be1d5d1SVasant Hegde pr_notice("Failed to read opal-msg-size property\n"); 3952be1d5d1SVasant Hegde opal_msg_size = sizeof(struct opal_msg); 3962be1d5d1SVasant Hegde } 3972be1d5d1SVasant Hegde 3982be1d5d1SVasant Hegde opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); 3992be1d5d1SVasant Hegde if (!opal_msg) { 4002be1d5d1SVasant Hegde opal_msg_size = sizeof(struct opal_msg); 4012be1d5d1SVasant Hegde /* Try to allocate fixed message size */ 4022be1d5d1SVasant Hegde opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); 4032be1d5d1SVasant Hegde BUG_ON(opal_msg == NULL); 4042be1d5d1SVasant Hegde } 4052be1d5d1SVasant Hegde 40624366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 40724366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 40824366360SMahesh Salgaonkar 409a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 410a295af24SAlistair Popple if (!irq) { 411a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 412a295af24SAlistair Popple __func__, irq); 413a295af24SAlistair Popple return irq; 414a295af24SAlistair Popple } 415a295af24SAlistair Popple 416a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 417a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 41824366360SMahesh Salgaonkar if (ret) { 419a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 42024366360SMahesh Salgaonkar __func__, ret); 42124366360SMahesh Salgaonkar return ret; 42224366360SMahesh Salgaonkar } 423a295af24SAlistair Popple 42424366360SMahesh Salgaonkar return 0; 42524366360SMahesh Salgaonkar } 42624366360SMahesh Salgaonkar 42714a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 42814a43e69SBenjamin Herrenschmidt { 4294f89363bSBenjamin Herrenschmidt s64 rc; 4304f89363bSBenjamin Herrenschmidt __be64 evt, len; 43114a43e69SBenjamin Herrenschmidt 43214a43e69SBenjamin Herrenschmidt if (!opal.entry) 433daea1175SBenjamin Herrenschmidt return -ENODEV; 43414a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4354f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 43614a43e69SBenjamin Herrenschmidt return 0; 4374f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 43814a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 43914a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 4404f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 44114a43e69SBenjamin Herrenschmidt return 0; 44214a43e69SBenjamin Herrenschmidt } 44314a43e69SBenjamin Herrenschmidt 44417cc1dd4SNicholas Piggin static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) 44514a43e69SBenjamin Herrenschmidt { 44617cc1dd4SNicholas Piggin unsigned long flags = 0 /* shut up gcc */; 447b74d2807SNicholas Piggin int written; 448b74d2807SNicholas Piggin __be64 olen; 449b74d2807SNicholas Piggin s64 rc; 45014a43e69SBenjamin Herrenschmidt 45114a43e69SBenjamin Herrenschmidt if (!opal.entry) 452daea1175SBenjamin Herrenschmidt return -ENODEV; 45314a43e69SBenjamin Herrenschmidt 45417cc1dd4SNicholas Piggin if (atomic) 45514a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 4564f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 457b74d2807SNicholas Piggin if (rc || be64_to_cpu(olen) < total_len) { 45814a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 45914a43e69SBenjamin Herrenschmidt if (rc) 460b74d2807SNicholas Piggin written = total_len; 461b74d2807SNicholas Piggin else 462b74d2807SNicholas Piggin written = -EAGAIN; 463b74d2807SNicholas Piggin goto out; 46414a43e69SBenjamin Herrenschmidt } 46514a43e69SBenjamin Herrenschmidt 466b74d2807SNicholas Piggin /* Should not get a partial write here because space is available. */ 4674f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 4684f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 469b74d2807SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 47095b861a7SNicholas Piggin if (rc == OPAL_BUSY_EVENT) 47136d2dabcSNicholas Piggin opal_poll_events(NULL); 472b74d2807SNicholas Piggin written = -EAGAIN; 473b74d2807SNicholas Piggin goto out; 47436d2dabcSNicholas Piggin } 47536d2dabcSNicholas Piggin 4761de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 47736d2dabcSNicholas Piggin if (rc != OPAL_SUCCESS) { 478b74d2807SNicholas Piggin written = opal_error_code(rc); 479b74d2807SNicholas Piggin goto out; 4801de1455fSBenjamin Herrenschmidt } 48136d2dabcSNicholas Piggin 482b74d2807SNicholas Piggin written = be64_to_cpu(olen); 483b74d2807SNicholas Piggin if (written < total_len) { 48417cc1dd4SNicholas Piggin if (atomic) { 485b74d2807SNicholas Piggin /* Should not happen */ 48617cc1dd4SNicholas Piggin pr_warn("atomic console write returned partial " 48717cc1dd4SNicholas Piggin "len=%d written=%d\n", total_len, written); 48817cc1dd4SNicholas Piggin } 489b74d2807SNicholas Piggin if (!written) 490b74d2807SNicholas Piggin written = -EAGAIN; 491b74d2807SNicholas Piggin } 492b74d2807SNicholas Piggin 493b74d2807SNicholas Piggin out: 49417cc1dd4SNicholas Piggin if (atomic) 495b74d2807SNicholas Piggin spin_unlock_irqrestore(&opal_write_lock, flags); 49636d2dabcSNicholas Piggin 497d2a2262eSNicholas Piggin return written; 498d2a2262eSNicholas Piggin } 499d2a2262eSNicholas Piggin 50017cc1dd4SNicholas Piggin int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 50117cc1dd4SNicholas Piggin { 50217cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, false); 50317cc1dd4SNicholas Piggin } 50417cc1dd4SNicholas Piggin 50517cc1dd4SNicholas Piggin /* 50617cc1dd4SNicholas Piggin * opal_put_chars_atomic will not perform partial-writes. Data will be 50717cc1dd4SNicholas Piggin * atomically written to the terminal or not at all. This is not strictly 50817cc1dd4SNicholas Piggin * true at the moment because console space can race with OPAL's console 50917cc1dd4SNicholas Piggin * writes. 51017cc1dd4SNicholas Piggin */ 51117cc1dd4SNicholas Piggin int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) 51217cc1dd4SNicholas Piggin { 51317cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, true); 51417cc1dd4SNicholas Piggin } 51517cc1dd4SNicholas Piggin 51695b861a7SNicholas Piggin static s64 __opal_flush_console(uint32_t vtermno) 517d2a2262eSNicholas Piggin { 518d2a2262eSNicholas Piggin s64 rc; 519d2a2262eSNicholas Piggin 520d2a2262eSNicholas Piggin if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { 521d2a2262eSNicholas Piggin __be64 evt; 522d2a2262eSNicholas Piggin 523d2a2262eSNicholas Piggin /* 524d2a2262eSNicholas Piggin * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, 525d2a2262eSNicholas Piggin * the console can still be flushed by calling the polling 526d2a2262eSNicholas Piggin * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. 527d2a2262eSNicholas Piggin */ 52895b861a7SNicholas Piggin WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); 52995b861a7SNicholas Piggin 53014a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 53195b861a7SNicholas Piggin if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) 532d2a2262eSNicholas Piggin return OPAL_SUCCESS; 53395b861a7SNicholas Piggin return OPAL_BUSY; 534d2a2262eSNicholas Piggin 53595b861a7SNicholas Piggin } else { 536d2a2262eSNicholas Piggin rc = opal_console_flush(vtermno); 537d2a2262eSNicholas Piggin if (rc == OPAL_BUSY_EVENT) { 538d2a2262eSNicholas Piggin opal_poll_events(NULL); 53995b861a7SNicholas Piggin rc = OPAL_BUSY; 540d2a2262eSNicholas Piggin } 54195b861a7SNicholas Piggin return rc; 542d2a2262eSNicholas Piggin } 54395b861a7SNicholas Piggin 54495b861a7SNicholas Piggin } 54595b861a7SNicholas Piggin 54695b861a7SNicholas Piggin /* 54795b861a7SNicholas Piggin * opal_flush_console spins until the console is flushed 54895b861a7SNicholas Piggin */ 54995b861a7SNicholas Piggin int opal_flush_console(uint32_t vtermno) 55095b861a7SNicholas Piggin { 55195b861a7SNicholas Piggin for (;;) { 55295b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 55395b861a7SNicholas Piggin 55495b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 55595b861a7SNicholas Piggin mdelay(1); 55695b861a7SNicholas Piggin continue; 55795b861a7SNicholas Piggin } 558d2a2262eSNicholas Piggin 559d2a2262eSNicholas Piggin return opal_error_code(rc); 56014a43e69SBenjamin Herrenschmidt } 56195b861a7SNicholas Piggin } 56295b861a7SNicholas Piggin 56395b861a7SNicholas Piggin /* 56495b861a7SNicholas Piggin * opal_flush_chars is an hvc interface that sleeps until the console is 56595b861a7SNicholas Piggin * flushed if wait, otherwise it will return -EBUSY if the console has data, 56695b861a7SNicholas Piggin * -EAGAIN if it has data and some of it was flushed. 56795b861a7SNicholas Piggin */ 56895b861a7SNicholas Piggin int opal_flush_chars(uint32_t vtermno, bool wait) 56995b861a7SNicholas Piggin { 57095b861a7SNicholas Piggin for (;;) { 57195b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 57295b861a7SNicholas Piggin 57395b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 57495b861a7SNicholas Piggin if (wait) { 57595b861a7SNicholas Piggin msleep(OPAL_BUSY_DELAY_MS); 57695b861a7SNicholas Piggin continue; 57795b861a7SNicholas Piggin } 57895b861a7SNicholas Piggin if (rc == OPAL_PARTIAL) 57995b861a7SNicholas Piggin return -EAGAIN; 58095b861a7SNicholas Piggin } 58195b861a7SNicholas Piggin 58295b861a7SNicholas Piggin return opal_error_code(rc); 58395b861a7SNicholas Piggin } 58495b861a7SNicholas Piggin } 58514a43e69SBenjamin Herrenschmidt 586b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 587b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 588b63a0ffeSMahesh Salgaonkar { 589b63a0ffeSMahesh Salgaonkar int recovered = 0; 590b63a0ffeSMahesh Salgaonkar 591806c0e6eSChristophe Leroy if (regs_is_unrecoverable(regs)) { 592b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 593c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 594b63a0ffeSMahesh Salgaonkar recovered = 0; 595b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 596b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 597b63a0ffeSMahesh Salgaonkar recovered = 1; 5981363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 5991363875bSNicholas Piggin /* Fatal machine check */ 6001363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 6011363875bSNicholas Piggin recovered = 0; 6026fcd6baaSNicholas Piggin } 6036fcd6baaSNicholas Piggin 604cda6618dSMahesh Salgaonkar if (!recovered && evt->sync_error) { 605b63a0ffeSMahesh Salgaonkar /* 6066fcd6baaSNicholas Piggin * Try to kill processes if we get a synchronous machine check 6076fcd6baaSNicholas Piggin * (e.g., one caused by execution of this instruction). This 6086fcd6baaSNicholas Piggin * will devolve into a panic if we try to kill init or are in 6096fcd6baaSNicholas Piggin * an interrupt etc. 610b63a0ffeSMahesh Salgaonkar * 611b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 6126fcd6baaSNicholas Piggin * TODO: This is not quite right for d-side machine 6136fcd6baaSNicholas Piggin * checks ->nip is not necessarily the important 6146fcd6baaSNicholas Piggin * address. 615b63a0ffeSMahesh Salgaonkar */ 6166fcd6baaSNicholas Piggin if ((user_mode(regs))) { 617b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 618b63a0ffeSMahesh Salgaonkar recovered = 1; 6196fcd6baaSNicholas Piggin } else if (die_will_crash()) { 6206fcd6baaSNicholas Piggin /* 6216fcd6baaSNicholas Piggin * die() would kill the kernel, so better to go via 6226fcd6baaSNicholas Piggin * the platform reboot code that will log the 6236fcd6baaSNicholas Piggin * machine check. 6246fcd6baaSNicholas Piggin */ 6256fcd6baaSNicholas Piggin recovered = 0; 6266fcd6baaSNicholas Piggin } else { 627209e9d50SNicholas Piggin die_mce("Machine check", regs, SIGBUS); 6286fcd6baaSNicholas Piggin recovered = 1; 629b63a0ffeSMahesh Salgaonkar } 6306fcd6baaSNicholas Piggin } 6316fcd6baaSNicholas Piggin 632b63a0ffeSMahesh Salgaonkar return recovered; 633b63a0ffeSMahesh Salgaonkar } 634b63a0ffeSMahesh Salgaonkar 63562dea077SBreno Leitao void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 636b746e3e0SNicholas Piggin { 63735adacd6SNicholas Piggin panic_flush_kmsg_start(); 63835adacd6SNicholas Piggin 639b746e3e0SNicholas Piggin pr_emerg("Hardware platform error: %s\n", msg); 640b746e3e0SNicholas Piggin if (regs) 641b746e3e0SNicholas Piggin show_regs(regs); 642b746e3e0SNicholas Piggin smp_send_stop(); 64335adacd6SNicholas Piggin 64435adacd6SNicholas Piggin panic_flush_kmsg_end(); 645b746e3e0SNicholas Piggin 646b746e3e0SNicholas Piggin /* 647b746e3e0SNicholas Piggin * Don't bother to shut things down because this will 648b746e3e0SNicholas Piggin * xstop the system. 649b746e3e0SNicholas Piggin */ 650b746e3e0SNicholas Piggin if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 651b746e3e0SNicholas Piggin == OPAL_UNSUPPORTED) { 652b746e3e0SNicholas Piggin pr_emerg("Reboot type %d not supported for %s\n", 653b746e3e0SNicholas Piggin OPAL_REBOOT_PLATFORM_ERROR, msg); 654b746e3e0SNicholas Piggin } 655b746e3e0SNicholas Piggin 656b746e3e0SNicholas Piggin /* 657b746e3e0SNicholas Piggin * We reached here. There can be three possibilities: 658b746e3e0SNicholas Piggin * 1. We are running on a firmware level that do not support 659b746e3e0SNicholas Piggin * opal_cec_reboot2() 660b746e3e0SNicholas Piggin * 2. We are running on a firmware level that do not support 661b746e3e0SNicholas Piggin * OPAL_REBOOT_PLATFORM_ERROR reboot type. 662b746e3e0SNicholas Piggin * 3. We are running on FSP based system that does not need 663b746e3e0SNicholas Piggin * opal to trigger checkstop explicitly for error analysis. 664b746e3e0SNicholas Piggin * The FSP PRD component would have already got notified 665b746e3e0SNicholas Piggin * about this error through other channels. 6665ee573e8SBalbir Singh * 4. We are running on a newer skiboot that by default does 6675ee573e8SBalbir Singh * not cause a checkstop, drops us back to the kernel to 6685ee573e8SBalbir Singh * extract context and state at the time of the error. 669b746e3e0SNicholas Piggin */ 670b746e3e0SNicholas Piggin 6715ee573e8SBalbir Singh panic(msg); 672b746e3e0SNicholas Piggin } 673b746e3e0SNicholas Piggin 674ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 675ed79ba9eSBenjamin Herrenschmidt { 67636df96f8SMahesh Salgaonkar struct machine_check_event evt; 677ed79ba9eSBenjamin Herrenschmidt 67836df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 67936df96f8SMahesh Salgaonkar return 0; 680ed79ba9eSBenjamin Herrenschmidt 681ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 68236df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 683ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 684ed79ba9eSBenjamin Herrenschmidt evt.version); 685ed79ba9eSBenjamin Herrenschmidt return 0; 686ed79ba9eSBenjamin Herrenschmidt } 687c0577201SPaul Mackerras machine_check_print_event_info(&evt, user_mode(regs), false); 688ed79ba9eSBenjamin Herrenschmidt 689b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 690b63a0ffeSMahesh Salgaonkar return 1; 691e784b649SMahesh Salgaonkar 692b746e3e0SNicholas Piggin pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 693ed79ba9eSBenjamin Herrenschmidt } 694ed79ba9eSBenjamin Herrenschmidt 6950869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 6960869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 6970869b6fdSMahesh Salgaonkar { 6980ef95b41SMahesh Salgaonkar s64 rc; 6990ef95b41SMahesh Salgaonkar 7000ef95b41SMahesh Salgaonkar /* 7010ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 7020ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 7030ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 7040ef95b41SMahesh Salgaonkar */ 7050ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 7060ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 7070ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 7080ef95b41SMahesh Salgaonkar return 1; 7090ef95b41SMahesh Salgaonkar } 7100869b6fdSMahesh Salgaonkar return 0; 7110869b6fdSMahesh Salgaonkar } 7120869b6fdSMahesh Salgaonkar 713de269129SMahesh Salgaonkar int opal_hmi_exception_early2(struct pt_regs *regs) 714de269129SMahesh Salgaonkar { 715de269129SMahesh Salgaonkar s64 rc; 716de269129SMahesh Salgaonkar __be64 out_flags; 717de269129SMahesh Salgaonkar 718de269129SMahesh Salgaonkar /* 719de269129SMahesh Salgaonkar * call opal hmi handler. 720de269129SMahesh Salgaonkar * Check 64-bit flag mask to find out if an event was generated, 721de269129SMahesh Salgaonkar * and whether TB is still valid or not etc. 722de269129SMahesh Salgaonkar */ 723de269129SMahesh Salgaonkar rc = opal_handle_hmi2(&out_flags); 724de269129SMahesh Salgaonkar if (rc != OPAL_SUCCESS) 725de269129SMahesh Salgaonkar return 0; 726de269129SMahesh Salgaonkar 727de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) 728de269129SMahesh Salgaonkar local_paca->hmi_event_available = 1; 729de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) 730de269129SMahesh Salgaonkar tb_invalid = true; 731de269129SMahesh Salgaonkar return 1; 732de269129SMahesh Salgaonkar } 733de269129SMahesh Salgaonkar 73459d512e4SNicholas Piggin /* HMI exception handler called in virtual mode when irqs are next enabled. */ 7350869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 7360869b6fdSMahesh Salgaonkar { 7370ef95b41SMahesh Salgaonkar /* 7380ef95b41SMahesh Salgaonkar * Check if HMI event is available. 73956c0b48bSNicholas Piggin * if Yes, then wake kopald to process them. 7400ef95b41SMahesh Salgaonkar */ 7410ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 7420869b6fdSMahesh Salgaonkar return 0; 7430ef95b41SMahesh Salgaonkar 7440ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 74556c0b48bSNicholas Piggin opal_wake_poller(); 7460ef95b41SMahesh Salgaonkar 7470ef95b41SMahesh Salgaonkar return 1; 7480869b6fdSMahesh Salgaonkar } 7490869b6fdSMahesh Salgaonkar 75055672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 75155672ecfSMahesh Salgaonkar { 75255672ecfSMahesh Salgaonkar int i; 75355672ecfSMahesh Salgaonkar 75455672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 75555672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 75655672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 75755672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 75855672ecfSMahesh Salgaonkar return 0; 75955672ecfSMahesh Salgaonkar } 76055672ecfSMahesh Salgaonkar 76155672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 76255672ecfSMahesh Salgaonkar { 76355672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 76455672ecfSMahesh Salgaonkar 76555672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 76655672ecfSMahesh Salgaonkar goto out; 76755672ecfSMahesh Salgaonkar 76855672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 769dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 77055672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 77155672ecfSMahesh Salgaonkar 77255672ecfSMahesh Salgaonkar /* 77355672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 77455672ecfSMahesh Salgaonkar */ 77555672ecfSMahesh Salgaonkar if (recover_addr) 77659dc5bfcSNicholas Piggin regs_set_return_ip(regs, recover_addr); 77755672ecfSMahesh Salgaonkar 77855672ecfSMahesh Salgaonkar out: 77955672ecfSMahesh Salgaonkar return !!recover_addr; 78055672ecfSMahesh Salgaonkar } 78155672ecfSMahesh Salgaonkar 782*e5913db1SNick Child static int __init opal_sysfs_init(void) 7836f68b5e2SVasant Hegde { 7846f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 7856f68b5e2SVasant Hegde if (!opal_kobj) { 7866f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 7876f68b5e2SVasant Hegde return -ENOMEM; 7886f68b5e2SVasant Hegde } 7896f68b5e2SVasant Hegde 7906f68b5e2SVasant Hegde return 0; 7916f68b5e2SVasant Hegde } 7926f68b5e2SVasant Hegde 79311fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 79411fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 79511fe909dSMatt Brown loff_t off, size_t count) 79611fe909dSMatt Brown { 79711fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 79811fe909dSMatt Brown bin_attr->size); 79911fe909dSMatt Brown } 80011fe909dSMatt Brown 801db933612SOliver O'Halloran static int opal_add_one_export(struct kobject *parent, const char *export_name, 802db933612SOliver O'Halloran struct device_node *np, const char *prop_name) 803db933612SOliver O'Halloran { 804db933612SOliver O'Halloran struct bin_attribute *attr = NULL; 805db933612SOliver O'Halloran const char *name = NULL; 806db933612SOliver O'Halloran u64 vals[2]; 807db933612SOliver O'Halloran int rc; 808db933612SOliver O'Halloran 809db933612SOliver O'Halloran rc = of_property_read_u64_array(np, prop_name, &vals[0], 2); 810db933612SOliver O'Halloran if (rc) 811db933612SOliver O'Halloran goto out; 812db933612SOliver O'Halloran 813db933612SOliver O'Halloran attr = kzalloc(sizeof(*attr), GFP_KERNEL); 814ceffa63aSChen Zhou if (!attr) { 815ceffa63aSChen Zhou rc = -ENOMEM; 816ceffa63aSChen Zhou goto out; 817ceffa63aSChen Zhou } 818db933612SOliver O'Halloran name = kstrdup(export_name, GFP_KERNEL); 819db933612SOliver O'Halloran if (!name) { 820db933612SOliver O'Halloran rc = -ENOMEM; 821db933612SOliver O'Halloran goto out; 822db933612SOliver O'Halloran } 823db933612SOliver O'Halloran 824db933612SOliver O'Halloran sysfs_bin_attr_init(attr); 825db933612SOliver O'Halloran attr->attr.name = name; 826db933612SOliver O'Halloran attr->attr.mode = 0400; 827db933612SOliver O'Halloran attr->read = export_attr_read; 828db933612SOliver O'Halloran attr->private = __va(vals[0]); 829db933612SOliver O'Halloran attr->size = vals[1]; 830db933612SOliver O'Halloran 831db933612SOliver O'Halloran rc = sysfs_create_bin_file(parent, attr); 832db933612SOliver O'Halloran out: 833db933612SOliver O'Halloran if (rc) { 834db933612SOliver O'Halloran kfree(name); 835db933612SOliver O'Halloran kfree(attr); 836db933612SOliver O'Halloran } 837db933612SOliver O'Halloran 838db933612SOliver O'Halloran return rc; 839db933612SOliver O'Halloran } 840db933612SOliver O'Halloran 841db933612SOliver O'Halloran static void opal_add_exported_attrs(struct device_node *np, 842db933612SOliver O'Halloran struct kobject *kobj) 843db933612SOliver O'Halloran { 844db933612SOliver O'Halloran struct device_node *child; 845db933612SOliver O'Halloran struct property *prop; 846db933612SOliver O'Halloran 847db933612SOliver O'Halloran for_each_property_of_node(np, prop) { 848db933612SOliver O'Halloran int rc; 849db933612SOliver O'Halloran 850db933612SOliver O'Halloran if (!strcmp(prop->name, "name") || 851db933612SOliver O'Halloran !strcmp(prop->name, "phandle")) 852db933612SOliver O'Halloran continue; 853db933612SOliver O'Halloran 854db933612SOliver O'Halloran rc = opal_add_one_export(kobj, prop->name, np, prop->name); 855db933612SOliver O'Halloran if (rc) { 856db933612SOliver O'Halloran pr_warn("Unable to add export %pOF/%s, rc = %d!\n", 857db933612SOliver O'Halloran np, prop->name, rc); 858db933612SOliver O'Halloran } 859db933612SOliver O'Halloran } 860db933612SOliver O'Halloran 861db933612SOliver O'Halloran for_each_child_of_node(np, child) { 862db933612SOliver O'Halloran struct kobject *child_kobj; 863db933612SOliver O'Halloran 864db933612SOliver O'Halloran child_kobj = kobject_create_and_add(child->name, kobj); 865db933612SOliver O'Halloran if (!child_kobj) { 866db933612SOliver O'Halloran pr_err("Unable to create export dir for %pOF\n", child); 867db933612SOliver O'Halloran continue; 868db933612SOliver O'Halloran } 869db933612SOliver O'Halloran 870db933612SOliver O'Halloran opal_add_exported_attrs(child, child_kobj); 871db933612SOliver O'Halloran } 872db933612SOliver O'Halloran } 873db933612SOliver O'Halloran 87411fe909dSMatt Brown /* 87511fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 87611fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 87711fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 87811fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 87911fe909dSMatt Brown * The new sysfs nodes are only readable by root. 88011fe909dSMatt Brown */ 88111fe909dSMatt Brown static void opal_export_attrs(void) 88211fe909dSMatt Brown { 88311fe909dSMatt Brown struct device_node *np; 88411fe909dSMatt Brown struct kobject *kobj; 885846a17a5SOliver O'Halloran int rc; 88611fe909dSMatt Brown 88711fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 88811fe909dSMatt Brown if (!np) 88911fe909dSMatt Brown return; 89011fe909dSMatt Brown 89111fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 89211fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 89311fe909dSMatt Brown if (!kobj) { 89411fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 89511fe909dSMatt Brown return; 89611fe909dSMatt Brown } 89711fe909dSMatt Brown 898db933612SOliver O'Halloran opal_add_exported_attrs(np, kobj); 89911fe909dSMatt Brown 900846a17a5SOliver O'Halloran /* 901846a17a5SOliver O'Halloran * NB: symbol_map existed before the generic export interface so it 902846a17a5SOliver O'Halloran * lives under the top level opal_kobj. 903846a17a5SOliver O'Halloran */ 904846a17a5SOliver O'Halloran rc = opal_add_one_export(opal_kobj, "symbol_map", 905846a17a5SOliver O'Halloran np->parent, "symbol-map"); 906846a17a5SOliver O'Halloran if (rc) 907846a17a5SOliver O'Halloran pr_warn("Error %d creating OPAL symbols file\n", rc); 908846a17a5SOliver O'Halloran 90911fe909dSMatt Brown of_node_put(np); 91011fe909dSMatt Brown } 91111fe909dSMatt Brown 912b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 913b09c2ec4SVasant Hegde { 914b09c2ec4SVasant Hegde void *addr; 915b09c2ec4SVasant Hegde uint64_t size; 916b09c2ec4SVasant Hegde int rc; 917b09c2ec4SVasant Hegde 918b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 919b962f5a4SStewart Smith return; 920b962f5a4SStewart Smith 921b09c2ec4SVasant Hegde /* Register kernel log buffer */ 922b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 9236501ab5eSPranith Kumar if (addr == NULL) 9246501ab5eSPranith Kumar return; 9256501ab5eSPranith Kumar 926b09c2ec4SVasant Hegde size = log_buf_len_get(); 9276501ab5eSPranith Kumar if (size == 0) 9286501ab5eSPranith Kumar return; 9296501ab5eSPranith Kumar 930b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 931b09c2ec4SVasant Hegde __pa(addr), size); 932b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 933b09c2ec4SVasant Hegde * know about that call 934b09c2ec4SVasant Hegde */ 935b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 936b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 937b09c2ec4SVasant Hegde "rc = %d\n", rc); 938b09c2ec4SVasant Hegde } 939608b286dSJeremy Kerr 940*e5913db1SNick Child static void __init opal_pdev_init(const char *compatible) 941ed59190eSCyril Bur { 942ed59190eSCyril Bur struct device_node *np; 943ed59190eSCyril Bur 9449e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 94547083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 94647083450SNeelesh Gupta } 94747083450SNeelesh Gupta 9488f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 9498f95faaaSMadhavan Srinivasan { 9508f95faaaSMadhavan Srinivasan struct device_node *np; 9518f95faaaSMadhavan Srinivasan 9528f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 9538f95faaaSMadhavan Srinivasan if (np) 9548f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 9558f95faaaSMadhavan Srinivasan } 9568f95faaaSMadhavan Srinivasan 9573bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 9583bf57561SBenjamin Herrenschmidt { 959a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 9609f0fd049SAlistair Popple 9613bf57561SBenjamin Herrenschmidt set_freezable(); 9623bf57561SBenjamin Herrenschmidt do { 9633bf57561SBenjamin Herrenschmidt try_to_freeze(); 96456c0b48bSNicholas Piggin 96556c0b48bSNicholas Piggin opal_handle_events(); 96656c0b48bSNicholas Piggin 96756c0b48bSNicholas Piggin set_current_state(TASK_INTERRUPTIBLE); 96856c0b48bSNicholas Piggin if (opal_have_pending_events()) 96956c0b48bSNicholas Piggin __set_current_state(TASK_RUNNING); 97056c0b48bSNicholas Piggin else 97156c0b48bSNicholas Piggin schedule_timeout(timeout); 97256c0b48bSNicholas Piggin 9733bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 9743bf57561SBenjamin Herrenschmidt 9753bf57561SBenjamin Herrenschmidt return 0; 9763bf57561SBenjamin Herrenschmidt } 9773bf57561SBenjamin Herrenschmidt 978a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 979a203658bSBenjamin Herrenschmidt { 980a203658bSBenjamin Herrenschmidt if (kopald_tsk) 981a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 982a203658bSBenjamin Herrenschmidt } 983a203658bSBenjamin Herrenschmidt 984*e5913db1SNick Child static void __init opal_init_heartbeat(void) 9853bf57561SBenjamin Herrenschmidt { 9863bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 9873bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 9883bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 9893bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 9903bf57561SBenjamin Herrenschmidt 9913bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 992a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 9933bf57561SBenjamin Herrenschmidt } 9943bf57561SBenjamin Herrenschmidt 99514a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 99614a43e69SBenjamin Herrenschmidt { 997c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 998c1c3a526SGavin Shan int rc; 99914a43e69SBenjamin Herrenschmidt 100014a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 100114a43e69SBenjamin Herrenschmidt if (!opal_node) { 100208135139SMichael Ellerman pr_warn("Device node not found\n"); 100314a43e69SBenjamin Herrenschmidt return -ENODEV; 100414a43e69SBenjamin Herrenschmidt } 10052db29d28SBenjamin Herrenschmidt 10062db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 100714a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 10082db29d28SBenjamin Herrenschmidt if (consoles) { 100914a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 10102c8e65b5SRob Herring if (!of_node_name_eq(np, "serial")) 101114a43e69SBenjamin Herrenschmidt continue; 101214a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 101314a43e69SBenjamin Herrenschmidt } 101414a43e69SBenjamin Herrenschmidt of_node_put(consoles); 10152db29d28SBenjamin Herrenschmidt } 1016a125e092SBenjamin Herrenschmidt 101796e023e7SAlistair Popple /* Initialise OPAL messaging system */ 10182be1d5d1SVasant Hegde opal_message_init(opal_node); 101996e023e7SAlistair Popple 102096e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 102196e023e7SAlistair Popple opal_async_comp_init(); 102296e023e7SAlistair Popple 102396e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 102496e023e7SAlistair Popple opal_sensor_init(); 102596e023e7SAlistair Popple 102696e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 102796e023e7SAlistair Popple opal_hmi_handler_init(); 102896e023e7SAlistair Popple 102947083450SNeelesh Gupta /* Create i2c platform devices */ 10309e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 103147083450SNeelesh Gupta 10323013e173SOliver O'Halloran /* Handle non-volatile memory devices */ 10333013e173SOliver O'Halloran opal_pdev_init("pmem-region"); 10343013e173SOliver O'Halloran 10353bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 10363bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 10373bf57561SBenjamin Herrenschmidt 10388f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 10398f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 10408f95faaaSMadhavan Srinivasan 1041c159b596SVasant Hegde /* Create leds platform devices */ 1042c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 1043c159b596SVasant Hegde if (leds) { 1044c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 1045c159b596SVasant Hegde of_node_put(leds); 1046c159b596SVasant Hegde } 1047c159b596SVasant Hegde 10489b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 10499b4fffa1SAndrew Donnellan opal_msglog_init(); 10509b4fffa1SAndrew Donnellan 10516f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 10526f68b5e2SVasant Hegde rc = opal_sysfs_init(); 105350bd6153SVasant Hegde if (rc == 0) { 1054b09c2ec4SVasant Hegde /* Setup dump region interface */ 1055b09c2ec4SVasant Hegde opal_dump_region_init(); 1056774fea1aSStewart Smith /* Setup error log interface */ 1057774fea1aSStewart Smith rc = opal_elog_init(); 105850bd6153SVasant Hegde /* Setup code update interface */ 1059ed59190eSCyril Bur opal_flash_update_init(); 1060c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 1061c7e64b9cSStewart Smith opal_platform_dump_init(); 10624029cd66SNeelesh Gupta /* Setup system parameters interface */ 10634029cd66SNeelesh Gupta opal_sys_param_init(); 10649b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 10659b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 1066db933612SOliver O'Halloran /* Add all export properties*/ 106711fe909dSMatt Brown opal_export_attrs(); 1068db933612SOliver O'Halloran } 106911fe909dSMatt Brown 10700d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 10719e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 10729e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 10739e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 1074ed59190eSCyril Bur 107543a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 10769e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 107743a1dd9bSSuraj Jitindar Singh 1078affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 1079affddff6SRussell Currey opal_kmsg_init(); 1080affddff6SRussell Currey 1081cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 1082cb8b340dSShilpasri G Bhat opal_powercap_init(); 1083cb8b340dSShilpasri G Bhat 10848e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 10858e84b2d1SShilpasri G Bhat opal_psr_init(); 10868e84b2d1SShilpasri G Bhat 1087bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 1088bf957155SShilpasri G Bhat opal_sensor_groups_init(); 1089bf957155SShilpasri G Bhat 109008fb726dSMahesh Salgaonkar /* Initialise OPAL Power control interface */ 109108fb726dSMahesh Salgaonkar opal_power_control_init(); 109208fb726dSMahesh Salgaonkar 10939155e234SNayna Jain /* Initialize OPAL secure variables */ 10949155e234SNayna Jain opal_pdev_init("ibm,secvar-backend"); 10959155e234SNayna Jain 109614a43e69SBenjamin Herrenschmidt return 0; 109714a43e69SBenjamin Herrenschmidt } 1098b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 109973ed148aSBenjamin Herrenschmidt 110073ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 110173ed148aSBenjamin Herrenschmidt { 1102f7d98d18SVasant Hegde long rc = OPAL_BUSY; 110373ed148aSBenjamin Herrenschmidt 11049f0fd049SAlistair Popple opal_event_shutdown(); 1105f7d98d18SVasant Hegde 1106f7d98d18SVasant Hegde /* 1107f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 1108f7d98d18SVasant Hegde * potentially write to our memory has completed such 1109f7d98d18SVasant Hegde * as an ongoing dump retrieval 1110f7d98d18SVasant Hegde */ 1111f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 1112f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 1113f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 1114f7d98d18SVasant Hegde opal_poll_events(NULL); 1115f7d98d18SVasant Hegde else 1116f7d98d18SVasant Hegde mdelay(10); 1117f7d98d18SVasant Hegde } 1118b09c2ec4SVasant Hegde 1119b09c2ec4SVasant Hegde /* Unregister memory dump region */ 1120b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 1121b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 112273ed148aSBenjamin Herrenschmidt } 1123e28b05e7SJoel Stanley 1124e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 1125e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 1126594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 1127594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 1128608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 1129608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 1130ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 1131ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 1132ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 11330d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 11346e708000SHaren Myneni EXPORT_SYMBOL_GPL(opal_check_token); 11353441f04bSAnton Blanchard 11363441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 11373441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 11383441f04bSAnton Blanchard unsigned long vmalloc_size) 11393441f04bSAnton Blanchard { 11403441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 11413441f04bSAnton Blanchard unsigned long i = 0; 11423441f04bSAnton Blanchard 11433441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 11443441f04bSAnton Blanchard if (!sg) 11453441f04bSAnton Blanchard goto nomem; 11463441f04bSAnton Blanchard 11473441f04bSAnton Blanchard first = sg; 11483441f04bSAnton Blanchard 11493441f04bSAnton Blanchard while (vmalloc_size > 0) { 11503441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 11513441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 11523441f04bSAnton Blanchard 11533441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 11543441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 11553441f04bSAnton Blanchard i++; 11563441f04bSAnton Blanchard 11573441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 11583441f04bSAnton Blanchard struct opal_sg_list *next; 11593441f04bSAnton Blanchard 11603441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 11613441f04bSAnton Blanchard if (!next) 11623441f04bSAnton Blanchard goto nomem; 11633441f04bSAnton Blanchard 11643441f04bSAnton Blanchard sg->length = cpu_to_be64( 11653441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 11663441f04bSAnton Blanchard i = 0; 11673441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 11683441f04bSAnton Blanchard sg = next; 11693441f04bSAnton Blanchard } 11703441f04bSAnton Blanchard 11713441f04bSAnton Blanchard vmalloc_addr += length; 11723441f04bSAnton Blanchard vmalloc_size -= length; 11733441f04bSAnton Blanchard } 11743441f04bSAnton Blanchard 11753441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 11763441f04bSAnton Blanchard 11773441f04bSAnton Blanchard return first; 11783441f04bSAnton Blanchard 11793441f04bSAnton Blanchard nomem: 11803441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 11813441f04bSAnton Blanchard opal_free_sg_list(first); 11823441f04bSAnton Blanchard return NULL; 11833441f04bSAnton Blanchard } 11843441f04bSAnton Blanchard 11853441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 11863441f04bSAnton Blanchard { 11873441f04bSAnton Blanchard while (sg) { 11883441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 11893441f04bSAnton Blanchard 11903441f04bSAnton Blanchard kfree(sg); 11913441f04bSAnton Blanchard 11923441f04bSAnton Blanchard if (next) 11933441f04bSAnton Blanchard sg = __va(next); 11943441f04bSAnton Blanchard else 11953441f04bSAnton Blanchard sg = NULL; 11963441f04bSAnton Blanchard } 11973441f04bSAnton Blanchard } 119816b1d26eSNeelesh Gupta 1199e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 1200e3c5c2e0SCédric Le Goater { 1201e3c5c2e0SCédric Le Goater switch (rc) { 1202e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 1203e3c5c2e0SCédric Le Goater 1204e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 1205e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 120677adbd22SCyril Bur case OPAL_BUSY: 1207e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 1208e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 120914aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 1210e3c5c2e0SCédric Le Goater 1211e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 1212e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 1213e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 1214cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 1215e3c5c2e0SCédric Le Goater default: 1216e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1217e3c5c2e0SCédric Le Goater return -EIO; 1218e3c5c2e0SCédric Le Goater } 1219e3c5c2e0SCédric Le Goater } 1220e3c5c2e0SCédric Le Goater 12211d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 12221d0761d2SAlistair Popple { 12231d0761d2SAlistair Popple int rc; 12241d0761d2SAlistair Popple 12251d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 12261d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 12271d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 12281d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 12291d0761d2SAlistair Popple } 12301d0761d2SAlistair Popple } 12311d0761d2SAlistair Popple 123216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 123316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 123416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 123516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 123616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 123747083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 1238c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1239c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1240c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 124143a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 124243a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1243ffe6d810SPaul Mackerras /* Export this for KVM */ 1244ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 12455af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 124677adbd22SCyril Bur EXPORT_SYMBOL_GPL(opal_error_code); 1247656ecc16SHaren Myneni /* Export the below symbol for NX compression */ 1248656ecc16SHaren Myneni EXPORT_SYMBOL(opal_nx_coproc_init); 1249