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 12c8742f85SBenjamin Herrenschmidt #define pr_fmt(fmt) "opal: " fmt 1314a43e69SBenjamin Herrenschmidt 14c8742f85SBenjamin Herrenschmidt #include <linux/printk.h> 1514a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1614a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1726a2056eSRob Herring #include <linux/of_fdt.h> 1814a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 19a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 201bc98de2SGavin Shan #include <linux/notifier.h> 2173ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 22b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 236f68b5e2SVasant Hegde #include <linux/kobject.h> 24f7d98d18SVasant Hegde #include <linux/delay.h> 2555672ecfSMahesh Salgaonkar #include <linux/memblock.h> 263bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 273bf57561SBenjamin Herrenschmidt #include <linux/freezer.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> 3314a43e69SBenjamin Herrenschmidt 3414a43e69SBenjamin Herrenschmidt #include "powernv.h" 3514a43e69SBenjamin Herrenschmidt 366f68b5e2SVasant Hegde /* /sys/firmware/opal */ 376f68b5e2SVasant Hegde struct kobject *opal_kobj; 386f68b5e2SVasant Hegde 3914a43e69SBenjamin Herrenschmidt struct opal { 4014a43e69SBenjamin Herrenschmidt u64 base; 4114a43e69SBenjamin Herrenschmidt u64 entry; 4255672ecfSMahesh Salgaonkar u64 size; 4314a43e69SBenjamin Herrenschmidt } opal; 4414a43e69SBenjamin Herrenschmidt 4555672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4655672ecfSMahesh Salgaonkar u64 start_addr; 4755672ecfSMahesh Salgaonkar u64 end_addr; 4855672ecfSMahesh Salgaonkar u64 recover_addr; 4955672ecfSMahesh Salgaonkar }; 5055672ecfSMahesh Salgaonkar 5155672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5255672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5355672ecfSMahesh Salgaonkar 54bfc36894SJoel Stanley struct device_node *opal_node; 5514a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 5673ed148aSBenjamin Herrenschmidt static unsigned int *opal_irqs; 5773ed148aSBenjamin Herrenschmidt static unsigned int opal_irq_count; 581bc98de2SGavin Shan static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); 5924366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 601bc98de2SGavin Shan static DEFINE_SPINLOCK(opal_notifier_lock); 611bc98de2SGavin Shan static uint64_t last_notified_mask = 0x0ul; 621bc98de2SGavin Shan static atomic_t opal_notifier_hold = ATOMIC_INIT(0); 633bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 6414a43e69SBenjamin Herrenschmidt 654926616cSBenjamin Herrenschmidt static void opal_reinit_cores(void) 664926616cSBenjamin Herrenschmidt { 674926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 684926616cSBenjamin Herrenschmidt * 694926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 704926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 714926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 724926616cSBenjamin Herrenschmidt */ 734926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 744926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 754926616cSBenjamin Herrenschmidt #else 764926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 774926616cSBenjamin Herrenschmidt #endif 784926616cSBenjamin Herrenschmidt } 794926616cSBenjamin Herrenschmidt 8014a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 8114a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 8214a43e69SBenjamin Herrenschmidt { 8355672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 849d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 8514a43e69SBenjamin Herrenschmidt 8614a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 8714a43e69SBenjamin Herrenschmidt return 0; 8814a43e69SBenjamin Herrenschmidt 8914a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 9014a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 9155672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 9214a43e69SBenjamin Herrenschmidt 9355672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 9414a43e69SBenjamin Herrenschmidt return 1; 9514a43e69SBenjamin Herrenschmidt 9614a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 9714a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 9855672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 9914a43e69SBenjamin Herrenschmidt 1009d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 10114a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1029d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 10314a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1049d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 10555672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 10614a43e69SBenjamin Herrenschmidt 10714a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPAL; 10875b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 10975b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 11075b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv3; 1119a4f5cd0SAnton Blanchard pr_info("OPAL V3 detected !\n"); 11275b93da4SBenjamin Herrenschmidt } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { 11314a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 1149a4f5cd0SAnton Blanchard pr_info("OPAL V2 detected !\n"); 11514a43e69SBenjamin Herrenschmidt } else { 1169a4f5cd0SAnton Blanchard pr_info("OPAL V1 detected !\n"); 11714a43e69SBenjamin Herrenschmidt } 11814a43e69SBenjamin Herrenschmidt 1194926616cSBenjamin Herrenschmidt /* Reinit all cores with the right endian */ 1204926616cSBenjamin Herrenschmidt opal_reinit_cores(); 1214926616cSBenjamin Herrenschmidt 1224926616cSBenjamin Herrenschmidt /* Restore some bits */ 1234926616cSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 1244926616cSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 1254926616cSBenjamin Herrenschmidt 126c4463b37SJeremy Kerr return 1; 127c4463b37SJeremy Kerr } 128c4463b37SJeremy Kerr 12955672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13055672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 13155672ecfSMahesh Salgaonkar { 1329d0c4dfeSRob Herring int i, psize, size; 13355672ecfSMahesh Salgaonkar const __be32 *prop; 13455672ecfSMahesh Salgaonkar 13555672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 13655672ecfSMahesh Salgaonkar return 0; 13755672ecfSMahesh Salgaonkar 1386e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 13955672ecfSMahesh Salgaonkar 14055672ecfSMahesh Salgaonkar if (!prop) 14155672ecfSMahesh Salgaonkar return 1; 14255672ecfSMahesh Salgaonkar 14355672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 14455672ecfSMahesh Salgaonkar 14555672ecfSMahesh Salgaonkar /* 1466e556b47SMahesh Salgaonkar * Calculate number of available entries. 1476e556b47SMahesh Salgaonkar * 1486e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1496e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1506e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1516e556b47SMahesh Salgaonkar */ 1526e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1536e556b47SMahesh Salgaonkar 1546e556b47SMahesh Salgaonkar /* Sanity check */ 1556e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1566e556b47SMahesh Salgaonkar return 1; 1576e556b47SMahesh Salgaonkar 1586e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1596e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1606e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1616e556b47SMahesh Salgaonkar 1626e556b47SMahesh Salgaonkar /* 16355672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 16455672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 16555672ecfSMahesh Salgaonkar * RMO region. 16655672ecfSMahesh Salgaonkar */ 16755672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 16855672ecfSMahesh Salgaonkar ppc64_rma_size)); 16955672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 17055672ecfSMahesh Salgaonkar 1716e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 17455672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 17555672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 17655672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 17755672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 17855672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 17955672ecfSMahesh Salgaonkar 18055672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18155672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18255672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18355672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 18455672ecfSMahesh Salgaonkar } 18555672ecfSMahesh Salgaonkar return 1; 18655672ecfSMahesh Salgaonkar } 18755672ecfSMahesh Salgaonkar 188c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 189c4463b37SJeremy Kerr { 19029186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 191c4463b37SJeremy Kerr u64 glue; 192c4463b37SJeremy Kerr 193c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 194c4463b37SJeremy Kerr return -ENODEV; 195c4463b37SJeremy Kerr 19628446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 19728446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 198ed79ba9eSBenjamin Herrenschmidt */ 199ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2006507955cSMahesh Salgaonkar 2016507955cSMahesh Salgaonkar /* 2026507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2036507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2046507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2056507955cSMahesh Salgaonkar * 2066507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2076507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2086507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2096507955cSMahesh Salgaonkar * 2106507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2116507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2126507955cSMahesh Salgaonkar */ 2136507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 21408135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2156507955cSMahesh Salgaonkar opal_register_exception_handler( 2166507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2176507955cSMahesh Salgaonkar 0, glue); 2186507955cSMahesh Salgaonkar glue += 128; 2196507955cSMahesh Salgaonkar } 2206507955cSMahesh Salgaonkar 221ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 22229186097SBenjamin Herrenschmidt #endif 223ed79ba9eSBenjamin Herrenschmidt 224c4463b37SJeremy Kerr return 0; 22514a43e69SBenjamin Herrenschmidt } 226b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 227c4463b37SJeremy Kerr 2281bc98de2SGavin Shan int opal_notifier_register(struct notifier_block *nb) 2291bc98de2SGavin Shan { 2301bc98de2SGavin Shan if (!nb) { 2311bc98de2SGavin Shan pr_warning("%s: Invalid argument (%p)\n", 2321bc98de2SGavin Shan __func__, nb); 2331bc98de2SGavin Shan return -EINVAL; 2341bc98de2SGavin Shan } 2351bc98de2SGavin Shan 2361bc98de2SGavin Shan atomic_notifier_chain_register(&opal_notifier_head, nb); 2371bc98de2SGavin Shan return 0; 2381bc98de2SGavin Shan } 239798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_register); 240798af00cSBenjamin Herrenschmidt 241798af00cSBenjamin Herrenschmidt int opal_notifier_unregister(struct notifier_block *nb) 242798af00cSBenjamin Herrenschmidt { 243798af00cSBenjamin Herrenschmidt if (!nb) { 244798af00cSBenjamin Herrenschmidt pr_warning("%s: Invalid argument (%p)\n", 245798af00cSBenjamin Herrenschmidt __func__, nb); 246798af00cSBenjamin Herrenschmidt return -EINVAL; 247798af00cSBenjamin Herrenschmidt } 248798af00cSBenjamin Herrenschmidt 249798af00cSBenjamin Herrenschmidt atomic_notifier_chain_unregister(&opal_notifier_head, nb); 250798af00cSBenjamin Herrenschmidt return 0; 251798af00cSBenjamin Herrenschmidt } 252798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_unregister); 2531bc98de2SGavin Shan 2541bc98de2SGavin Shan static void opal_do_notifier(uint64_t events) 2551bc98de2SGavin Shan { 2561bc98de2SGavin Shan unsigned long flags; 2571bc98de2SGavin Shan uint64_t changed_mask; 2581bc98de2SGavin Shan 2591bc98de2SGavin Shan if (atomic_read(&opal_notifier_hold)) 2601bc98de2SGavin Shan return; 2611bc98de2SGavin Shan 2621bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2631bc98de2SGavin Shan changed_mask = last_notified_mask ^ events; 2641bc98de2SGavin Shan last_notified_mask = events; 2651bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2661bc98de2SGavin Shan 2671bc98de2SGavin Shan /* 2681bc98de2SGavin Shan * We feed with the event bits and changed bits for 2691bc98de2SGavin Shan * enough information to the callback. 2701bc98de2SGavin Shan */ 2711bc98de2SGavin Shan atomic_notifier_call_chain(&opal_notifier_head, 2721bc98de2SGavin Shan events, (void *)changed_mask); 2731bc98de2SGavin Shan } 2741bc98de2SGavin Shan 2751bc98de2SGavin Shan void opal_notifier_update_evt(uint64_t evt_mask, 2761bc98de2SGavin Shan uint64_t evt_val) 2771bc98de2SGavin Shan { 2781bc98de2SGavin Shan unsigned long flags; 2791bc98de2SGavin Shan 2801bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2811bc98de2SGavin Shan last_notified_mask &= ~evt_mask; 2821bc98de2SGavin Shan last_notified_mask |= evt_val; 2831bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2841bc98de2SGavin Shan } 2851bc98de2SGavin Shan 2861bc98de2SGavin Shan void opal_notifier_enable(void) 2871bc98de2SGavin Shan { 2881bc98de2SGavin Shan int64_t rc; 28956b4c993SAnton Blanchard __be64 evt = 0; 2901bc98de2SGavin Shan 2911bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 0); 2921bc98de2SGavin Shan 2931bc98de2SGavin Shan /* Process pending events */ 2941bc98de2SGavin Shan rc = opal_poll_events(&evt); 2951bc98de2SGavin Shan if (rc == OPAL_SUCCESS && evt) 29656b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(evt)); 2971bc98de2SGavin Shan } 2981bc98de2SGavin Shan 2991bc98de2SGavin Shan void opal_notifier_disable(void) 3001bc98de2SGavin Shan { 3011bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 1); 3021bc98de2SGavin Shan } 3031bc98de2SGavin Shan 30424366360SMahesh Salgaonkar /* 30524366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 30624366360SMahesh Salgaonkar * notified for specific messgae type. 30724366360SMahesh Salgaonkar */ 308d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 30924366360SMahesh Salgaonkar struct notifier_block *nb) 31024366360SMahesh Salgaonkar { 311792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 312792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 31324366360SMahesh Salgaonkar __func__, msg_type); 31424366360SMahesh Salgaonkar return -EINVAL; 31524366360SMahesh Salgaonkar } 316792f96e9SNeelesh Gupta 31724366360SMahesh Salgaonkar return atomic_notifier_chain_register( 31824366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 31924366360SMahesh Salgaonkar } 32024366360SMahesh Salgaonkar 321df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 322b921e902SNeelesh Gupta struct notifier_block *nb) 323b921e902SNeelesh Gupta { 324b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 325b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 326b921e902SNeelesh Gupta } 327b921e902SNeelesh Gupta 32824366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 32924366360SMahesh Salgaonkar { 33024366360SMahesh Salgaonkar /* notify subscribers */ 33124366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 33224366360SMahesh Salgaonkar msg_type, msg); 33324366360SMahesh Salgaonkar } 33424366360SMahesh Salgaonkar 33524366360SMahesh Salgaonkar static void opal_handle_message(void) 33624366360SMahesh Salgaonkar { 33724366360SMahesh Salgaonkar s64 ret; 33824366360SMahesh Salgaonkar /* 33924366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 34024366360SMahesh Salgaonkar * value in /proc/device-tree. 34124366360SMahesh Salgaonkar */ 34224366360SMahesh Salgaonkar static struct opal_msg msg; 343bb4398e1SAnton Blanchard u32 type; 34424366360SMahesh Salgaonkar 34524366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 34624366360SMahesh Salgaonkar /* No opal message pending. */ 34724366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 34824366360SMahesh Salgaonkar return; 34924366360SMahesh Salgaonkar 35024366360SMahesh Salgaonkar /* check for errors. */ 35124366360SMahesh Salgaonkar if (ret) { 3521a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 35324366360SMahesh Salgaonkar __func__, ret); 35424366360SMahesh Salgaonkar return; 35524366360SMahesh Salgaonkar } 35624366360SMahesh Salgaonkar 357bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 358bb4398e1SAnton Blanchard 35924366360SMahesh Salgaonkar /* Sanity check */ 360792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 361bb4398e1SAnton Blanchard pr_warning("%s: Unknown message type: %u\n", __func__, type); 36224366360SMahesh Salgaonkar return; 36324366360SMahesh Salgaonkar } 364bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 36524366360SMahesh Salgaonkar } 36624366360SMahesh Salgaonkar 36724366360SMahesh Salgaonkar static int opal_message_notify(struct notifier_block *nb, 36824366360SMahesh Salgaonkar unsigned long events, void *change) 36924366360SMahesh Salgaonkar { 37024366360SMahesh Salgaonkar if (events & OPAL_EVENT_MSG_PENDING) 37124366360SMahesh Salgaonkar opal_handle_message(); 37224366360SMahesh Salgaonkar return 0; 37324366360SMahesh Salgaonkar } 37424366360SMahesh Salgaonkar 37524366360SMahesh Salgaonkar static struct notifier_block opal_message_nb = { 37624366360SMahesh Salgaonkar .notifier_call = opal_message_notify, 37724366360SMahesh Salgaonkar .next = NULL, 37824366360SMahesh Salgaonkar .priority = 0, 37924366360SMahesh Salgaonkar }; 38024366360SMahesh Salgaonkar 38124366360SMahesh Salgaonkar static int __init opal_message_init(void) 38224366360SMahesh Salgaonkar { 38324366360SMahesh Salgaonkar int ret, i; 38424366360SMahesh Salgaonkar 38524366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 38624366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 38724366360SMahesh Salgaonkar 38824366360SMahesh Salgaonkar ret = opal_notifier_register(&opal_message_nb); 38924366360SMahesh Salgaonkar if (ret) { 39024366360SMahesh Salgaonkar pr_err("%s: Can't register OPAL event notifier (%d)\n", 39124366360SMahesh Salgaonkar __func__, ret); 39224366360SMahesh Salgaonkar return ret; 39324366360SMahesh Salgaonkar } 39424366360SMahesh Salgaonkar return 0; 39524366360SMahesh Salgaonkar } 396b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_message_init); 39724366360SMahesh Salgaonkar 39814a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 39914a43e69SBenjamin Herrenschmidt { 4004f89363bSBenjamin Herrenschmidt s64 rc; 4014f89363bSBenjamin Herrenschmidt __be64 evt, len; 40214a43e69SBenjamin Herrenschmidt 40314a43e69SBenjamin Herrenschmidt if (!opal.entry) 404daea1175SBenjamin Herrenschmidt return -ENODEV; 40514a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4064f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 40714a43e69SBenjamin Herrenschmidt return 0; 4084f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 40914a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 41014a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 4114f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 41214a43e69SBenjamin Herrenschmidt return 0; 41314a43e69SBenjamin Herrenschmidt } 41414a43e69SBenjamin Herrenschmidt 41514a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 41614a43e69SBenjamin Herrenschmidt { 41714a43e69SBenjamin Herrenschmidt int written = 0; 4184f89363bSBenjamin Herrenschmidt __be64 olen; 419daea1175SBenjamin Herrenschmidt s64 len, rc; 42014a43e69SBenjamin Herrenschmidt unsigned long flags; 4214f89363bSBenjamin Herrenschmidt __be64 evt; 42214a43e69SBenjamin Herrenschmidt 42314a43e69SBenjamin Herrenschmidt if (!opal.entry) 424daea1175SBenjamin Herrenschmidt return -ENODEV; 42514a43e69SBenjamin Herrenschmidt 42614a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 42714a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 428daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 429daea1175SBenjamin Herrenschmidt * 430daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 431daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 432daea1175SBenjamin Herrenschmidt * enough room and be done with it 43314a43e69SBenjamin Herrenschmidt */ 43414a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 435daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 4364f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 4374f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 43814a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 43914a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 44014a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 44114a43e69SBenjamin Herrenschmidt if (rc) 44214a43e69SBenjamin Herrenschmidt return total_len; 4434f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 44414a43e69SBenjamin Herrenschmidt return -EAGAIN; 44514a43e69SBenjamin Herrenschmidt } 446daea1175SBenjamin Herrenschmidt } 44714a43e69SBenjamin Herrenschmidt 44814a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 44914a43e69SBenjamin Herrenschmidt * should no longer happen. 45014a43e69SBenjamin Herrenschmidt */ 451daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 45214a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 45314a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 4544f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 4554f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 4564f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 4571de1455fSBenjamin Herrenschmidt 4581de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 4591de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 4601de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 4611de1455fSBenjamin Herrenschmidt written = total_len; 4621de1455fSBenjamin Herrenschmidt break; 4631de1455fSBenjamin Herrenschmidt } 46414a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 46514a43e69SBenjamin Herrenschmidt total_len -= len; 46614a43e69SBenjamin Herrenschmidt data += len; 46714a43e69SBenjamin Herrenschmidt written += len; 46814a43e69SBenjamin Herrenschmidt } 46914a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 47014a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 47114a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 47214a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 47314a43e69SBenjamin Herrenschmidt */ 47414a43e69SBenjamin Herrenschmidt do 47514a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4764f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4774f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 47814a43e69SBenjamin Herrenschmidt } 47914a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 48014a43e69SBenjamin Herrenschmidt return written; 48114a43e69SBenjamin Herrenschmidt } 48214a43e69SBenjamin Herrenschmidt 483b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 484b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 485b63a0ffeSMahesh Salgaonkar { 486b63a0ffeSMahesh Salgaonkar int recovered = 0; 487b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 488b63a0ffeSMahesh Salgaonkar 489b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 490b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 491b63a0ffeSMahesh Salgaonkar recovered = 0; 492b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 493b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 494b63a0ffeSMahesh Salgaonkar recovered = 1; 495b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 496b63a0ffeSMahesh Salgaonkar /* 497b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 498b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 499b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 500b63a0ffeSMahesh Salgaonkar * in userspace. 501b63a0ffeSMahesh Salgaonkar * 502b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 503b63a0ffeSMahesh Salgaonkar */ 504b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 505b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 506b63a0ffeSMahesh Salgaonkar recovered = 1; 507b63a0ffeSMahesh Salgaonkar } else 508b63a0ffeSMahesh Salgaonkar recovered = 0; 509b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 510b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 511b63a0ffeSMahesh Salgaonkar /* 512b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 513b63a0ffeSMahesh Salgaonkar * kill the task. 514b63a0ffeSMahesh Salgaonkar */ 515b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 516b63a0ffeSMahesh Salgaonkar recovered = 1; 517b63a0ffeSMahesh Salgaonkar } 518b63a0ffeSMahesh Salgaonkar return recovered; 519b63a0ffeSMahesh Salgaonkar } 520b63a0ffeSMahesh Salgaonkar 521ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 522ed79ba9eSBenjamin Herrenschmidt { 52336df96f8SMahesh Salgaonkar struct machine_check_event evt; 524ed79ba9eSBenjamin Herrenschmidt 52536df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 52636df96f8SMahesh Salgaonkar return 0; 527ed79ba9eSBenjamin Herrenschmidt 528ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 52936df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 530ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 531ed79ba9eSBenjamin Herrenschmidt evt.version); 532ed79ba9eSBenjamin Herrenschmidt return 0; 533ed79ba9eSBenjamin Herrenschmidt } 534b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 535ed79ba9eSBenjamin Herrenschmidt 536b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 537b63a0ffeSMahesh Salgaonkar return 1; 538b63a0ffeSMahesh Salgaonkar return 0; 539ed79ba9eSBenjamin Herrenschmidt } 540ed79ba9eSBenjamin Herrenschmidt 5410869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 5420869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 5430869b6fdSMahesh Salgaonkar { 5440ef95b41SMahesh Salgaonkar s64 rc; 5450ef95b41SMahesh Salgaonkar 5460ef95b41SMahesh Salgaonkar /* 5470ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5480ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5490ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5500ef95b41SMahesh Salgaonkar */ 5510ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5520ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5530ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5540ef95b41SMahesh Salgaonkar return 1; 5550ef95b41SMahesh Salgaonkar } 5560869b6fdSMahesh Salgaonkar return 0; 5570869b6fdSMahesh Salgaonkar } 5580869b6fdSMahesh Salgaonkar 5590869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5600869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5610869b6fdSMahesh Salgaonkar { 5620ef95b41SMahesh Salgaonkar s64 rc; 5630ef95b41SMahesh Salgaonkar __be64 evt = 0; 5640ef95b41SMahesh Salgaonkar 5650ef95b41SMahesh Salgaonkar /* 5660ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5670ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5680ef95b41SMahesh Salgaonkar * process them. 5690ef95b41SMahesh Salgaonkar */ 5700ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5710869b6fdSMahesh Salgaonkar return 0; 5720ef95b41SMahesh Salgaonkar 5730ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5740ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 5750ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS && evt) 5760ef95b41SMahesh Salgaonkar opal_do_notifier(be64_to_cpu(evt)); 5770ef95b41SMahesh Salgaonkar 5780ef95b41SMahesh Salgaonkar return 1; 5790869b6fdSMahesh Salgaonkar } 5800869b6fdSMahesh Salgaonkar 58155672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 58255672ecfSMahesh Salgaonkar { 58355672ecfSMahesh Salgaonkar int i; 58455672ecfSMahesh Salgaonkar 58555672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 58655672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 58755672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 58855672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 58955672ecfSMahesh Salgaonkar return 0; 59055672ecfSMahesh Salgaonkar } 59155672ecfSMahesh Salgaonkar 59255672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 59355672ecfSMahesh Salgaonkar { 59455672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 59555672ecfSMahesh Salgaonkar 59655672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 59755672ecfSMahesh Salgaonkar goto out; 59855672ecfSMahesh Salgaonkar 59955672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 60055672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 60155672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 60255672ecfSMahesh Salgaonkar 60355672ecfSMahesh Salgaonkar /* 60455672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 60555672ecfSMahesh Salgaonkar */ 60655672ecfSMahesh Salgaonkar if (recover_addr) 60755672ecfSMahesh Salgaonkar regs->nip = recover_addr; 60855672ecfSMahesh Salgaonkar 60955672ecfSMahesh Salgaonkar out: 61055672ecfSMahesh Salgaonkar return !!recover_addr; 61155672ecfSMahesh Salgaonkar } 61255672ecfSMahesh Salgaonkar 613a125e092SBenjamin Herrenschmidt static irqreturn_t opal_interrupt(int irq, void *data) 614a125e092SBenjamin Herrenschmidt { 6155e4da530SAnton Blanchard __be64 events; 616a125e092SBenjamin Herrenschmidt 617a125e092SBenjamin Herrenschmidt opal_handle_interrupt(virq_to_hw(irq), &events); 618a125e092SBenjamin Herrenschmidt 61956b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(events)); 620a125e092SBenjamin Herrenschmidt 621a125e092SBenjamin Herrenschmidt return IRQ_HANDLED; 622a125e092SBenjamin Herrenschmidt } 623a125e092SBenjamin Herrenschmidt 6246f68b5e2SVasant Hegde static int opal_sysfs_init(void) 6256f68b5e2SVasant Hegde { 6266f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 6276f68b5e2SVasant Hegde if (!opal_kobj) { 6286f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 6296f68b5e2SVasant Hegde return -ENOMEM; 6306f68b5e2SVasant Hegde } 6316f68b5e2SVasant Hegde 6326f68b5e2SVasant Hegde return 0; 6336f68b5e2SVasant Hegde } 6346f68b5e2SVasant Hegde 635c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 636c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 637c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 638c8742f85SBenjamin Herrenschmidt { 639c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 640c8742f85SBenjamin Herrenschmidt bin_attr->size); 641c8742f85SBenjamin Herrenschmidt } 642c8742f85SBenjamin Herrenschmidt 643c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 644c8742f85SBenjamin Herrenschmidt 645c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 646c8742f85SBenjamin Herrenschmidt { 647c8742f85SBenjamin Herrenschmidt const __be64 *syms; 648c8742f85SBenjamin Herrenschmidt unsigned int size; 649c8742f85SBenjamin Herrenschmidt struct device_node *fw; 650c8742f85SBenjamin Herrenschmidt int rc; 651c8742f85SBenjamin Herrenschmidt 652c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 653c8742f85SBenjamin Herrenschmidt if (!fw) 654c8742f85SBenjamin Herrenschmidt return; 655c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 656c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 657c8742f85SBenjamin Herrenschmidt return; 658c8742f85SBenjamin Herrenschmidt 659c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 660c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 661c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 662c8742f85SBenjamin Herrenschmidt 663c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 664c8742f85SBenjamin Herrenschmidt if (rc) 665c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 666c8742f85SBenjamin Herrenschmidt } 667c8742f85SBenjamin Herrenschmidt 668b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 669b09c2ec4SVasant Hegde { 670b09c2ec4SVasant Hegde void *addr; 671b09c2ec4SVasant Hegde uint64_t size; 672b09c2ec4SVasant Hegde int rc; 673b09c2ec4SVasant Hegde 674b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 675b962f5a4SStewart Smith return; 676b962f5a4SStewart Smith 677b09c2ec4SVasant Hegde /* Register kernel log buffer */ 678b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 6796501ab5eSPranith Kumar if (addr == NULL) 6806501ab5eSPranith Kumar return; 6816501ab5eSPranith Kumar 682b09c2ec4SVasant Hegde size = log_buf_len_get(); 6836501ab5eSPranith Kumar if (size == 0) 6846501ab5eSPranith Kumar return; 6856501ab5eSPranith Kumar 686b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 687b09c2ec4SVasant Hegde __pa(addr), size); 688b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 689b09c2ec4SVasant Hegde * know about that call 690b09c2ec4SVasant Hegde */ 691b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 692b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 693b09c2ec4SVasant Hegde "rc = %d\n", rc); 694b09c2ec4SVasant Hegde } 695608b286dSJeremy Kerr 696608b286dSJeremy Kerr static void opal_ipmi_init(struct device_node *opal_node) 697608b286dSJeremy Kerr { 698608b286dSJeremy Kerr struct device_node *np; 699608b286dSJeremy Kerr 700608b286dSJeremy Kerr for_each_child_of_node(opal_node, np) 701608b286dSJeremy Kerr if (of_device_is_compatible(np, "ibm,opal-ipmi")) 702608b286dSJeremy Kerr of_platform_device_create(np, NULL, NULL); 703608b286dSJeremy Kerr } 704608b286dSJeremy Kerr 70547083450SNeelesh Gupta static void opal_i2c_create_devs(void) 70647083450SNeelesh Gupta { 70747083450SNeelesh Gupta struct device_node *np; 70847083450SNeelesh Gupta 70947083450SNeelesh Gupta for_each_compatible_node(np, NULL, "ibm,opal-i2c") 71047083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 71147083450SNeelesh Gupta } 71247083450SNeelesh Gupta 713c1c3a526SGavin Shan static void __init opal_irq_init(struct device_node *dn) 714c1c3a526SGavin Shan { 715c1c3a526SGavin Shan const __be32 *irqs; 716c1c3a526SGavin Shan int i, irqlen; 717c1c3a526SGavin Shan 718c1c3a526SGavin Shan /* Get interrupt property */ 719c1c3a526SGavin Shan irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 72031494cf3SGavin Shan opal_irq_count = irqs ? (irqlen / 4) : 0; 72131494cf3SGavin Shan pr_debug("Found %d interrupts reserved for OPAL\n", opal_irq_count); 72231494cf3SGavin Shan if (!opal_irq_count) 72331494cf3SGavin Shan return; 724c1c3a526SGavin Shan 725c1c3a526SGavin Shan /* Install interrupt handlers */ 726c1c3a526SGavin Shan opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 727c1c3a526SGavin Shan for (i = 0; irqs && i < opal_irq_count; i++, irqs++) { 728c1c3a526SGavin Shan unsigned int irq, virq; 729c1c3a526SGavin Shan int rc; 730c1c3a526SGavin Shan 731c1c3a526SGavin Shan /* Get hardware and virtual IRQ */ 732c1c3a526SGavin Shan irq = be32_to_cpup(irqs); 733c1c3a526SGavin Shan virq = irq_create_mapping(NULL, irq); 734c1c3a526SGavin Shan if (virq == NO_IRQ) { 735c1c3a526SGavin Shan pr_warn("Failed to map irq 0x%x\n", irq); 736c1c3a526SGavin Shan continue; 737c1c3a526SGavin Shan } 738c1c3a526SGavin Shan 739c1c3a526SGavin Shan /* Install interrupt handler */ 740c1c3a526SGavin Shan rc = request_irq(virq, opal_interrupt, 0, "opal", NULL); 741c1c3a526SGavin Shan if (rc) { 742c1c3a526SGavin Shan irq_dispose_mapping(virq); 743c1c3a526SGavin Shan pr_warn("Error %d requesting irq %d (0x%x)\n", 744c1c3a526SGavin Shan rc, virq, irq); 745c1c3a526SGavin Shan continue; 746c1c3a526SGavin Shan } 747c1c3a526SGavin Shan 748c1c3a526SGavin Shan /* Cache IRQ */ 749c1c3a526SGavin Shan opal_irqs[i] = virq; 750c1c3a526SGavin Shan } 751c1c3a526SGavin Shan } 752c1c3a526SGavin Shan 7533bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 7543bf57561SBenjamin Herrenschmidt { 7553bf57561SBenjamin Herrenschmidt set_freezable(); 7563bf57561SBenjamin Herrenschmidt do { 7573bf57561SBenjamin Herrenschmidt try_to_freeze(); 7583bf57561SBenjamin Herrenschmidt opal_poll_events(NULL); 7593bf57561SBenjamin Herrenschmidt msleep_interruptible(opal_heartbeat); 7603bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 7613bf57561SBenjamin Herrenschmidt 7623bf57561SBenjamin Herrenschmidt return 0; 7633bf57561SBenjamin Herrenschmidt } 7643bf57561SBenjamin Herrenschmidt 7653bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 7663bf57561SBenjamin Herrenschmidt { 7673bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 7683bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 7693bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 7703bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 7713bf57561SBenjamin Herrenschmidt 7723bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 7733bf57561SBenjamin Herrenschmidt kthread_run(kopald, NULL, "kopald"); 7743bf57561SBenjamin Herrenschmidt } 7753bf57561SBenjamin Herrenschmidt 77614a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 77714a43e69SBenjamin Herrenschmidt { 77814a43e69SBenjamin Herrenschmidt struct device_node *np, *consoles; 779c1c3a526SGavin Shan int rc; 78014a43e69SBenjamin Herrenschmidt 78114a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 78214a43e69SBenjamin Herrenschmidt if (!opal_node) { 78308135139SMichael Ellerman pr_warn("Device node not found\n"); 78414a43e69SBenjamin Herrenschmidt return -ENODEV; 78514a43e69SBenjamin Herrenschmidt } 7862db29d28SBenjamin Herrenschmidt 7872db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 78814a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 78914a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 79014a43e69SBenjamin Herrenschmidt else 79114a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 7922db29d28SBenjamin Herrenschmidt if (consoles) { 79314a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 79414a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 79514a43e69SBenjamin Herrenschmidt continue; 79614a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 79714a43e69SBenjamin Herrenschmidt } 79814a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7992db29d28SBenjamin Herrenschmidt } 800a125e092SBenjamin Herrenschmidt 80147083450SNeelesh Gupta /* Create i2c platform devices */ 80247083450SNeelesh Gupta opal_i2c_create_devs(); 80347083450SNeelesh Gupta 8043bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 8053bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 8063bf57561SBenjamin Herrenschmidt 807a125e092SBenjamin Herrenschmidt /* Find all OPAL interrupts and request them */ 808c1c3a526SGavin Shan opal_irq_init(opal_node); 8096f68b5e2SVasant Hegde 8106f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 8116f68b5e2SVasant Hegde rc = opal_sysfs_init(); 81250bd6153SVasant Hegde if (rc == 0) { 813c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 814c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 815b09c2ec4SVasant Hegde /* Setup dump region interface */ 816b09c2ec4SVasant Hegde opal_dump_region_init(); 817774fea1aSStewart Smith /* Setup error log interface */ 818774fea1aSStewart Smith rc = opal_elog_init(); 81950bd6153SVasant Hegde /* Setup code update interface */ 82050bd6153SVasant Hegde opal_flash_init(); 821c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 822c7e64b9cSStewart Smith opal_platform_dump_init(); 8234029cd66SNeelesh Gupta /* Setup system parameters interface */ 8244029cd66SNeelesh Gupta opal_sys_param_init(); 825bfc36894SJoel Stanley /* Setup message log interface. */ 826bfc36894SJoel Stanley opal_msglog_init(); 82750bd6153SVasant Hegde } 8286f68b5e2SVasant Hegde 8293bf57561SBenjamin Herrenschmidt /* Initialize OPAL IPMI backend */ 830608b286dSJeremy Kerr opal_ipmi_init(opal_node); 831608b286dSJeremy Kerr 83214a43e69SBenjamin Herrenschmidt return 0; 83314a43e69SBenjamin Herrenschmidt } 834b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 83573ed148aSBenjamin Herrenschmidt 83673ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 83773ed148aSBenjamin Herrenschmidt { 83873ed148aSBenjamin Herrenschmidt unsigned int i; 839f7d98d18SVasant Hegde long rc = OPAL_BUSY; 84073ed148aSBenjamin Herrenschmidt 841f7d98d18SVasant Hegde /* First free interrupts, which will also mask them */ 84273ed148aSBenjamin Herrenschmidt for (i = 0; i < opal_irq_count; i++) { 84373ed148aSBenjamin Herrenschmidt if (opal_irqs[i]) 844b0d436c7SAnton Blanchard free_irq(opal_irqs[i], NULL); 84573ed148aSBenjamin Herrenschmidt opal_irqs[i] = 0; 84673ed148aSBenjamin Herrenschmidt } 847f7d98d18SVasant Hegde 848f7d98d18SVasant Hegde /* 849f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 850f7d98d18SVasant Hegde * potentially write to our memory has completed such 851f7d98d18SVasant Hegde * as an ongoing dump retrieval 852f7d98d18SVasant Hegde */ 853f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 854f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 855f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 856f7d98d18SVasant Hegde opal_poll_events(NULL); 857f7d98d18SVasant Hegde else 858f7d98d18SVasant Hegde mdelay(10); 859f7d98d18SVasant Hegde } 860b09c2ec4SVasant Hegde 861b09c2ec4SVasant Hegde /* Unregister memory dump region */ 862b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 863b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 86473ed148aSBenjamin Herrenschmidt } 865e28b05e7SJoel Stanley 866e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 867e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 868608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 869608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 8703441f04bSAnton Blanchard 8713441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 8723441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 8733441f04bSAnton Blanchard unsigned long vmalloc_size) 8743441f04bSAnton Blanchard { 8753441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 8763441f04bSAnton Blanchard unsigned long i = 0; 8773441f04bSAnton Blanchard 8783441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 8793441f04bSAnton Blanchard if (!sg) 8803441f04bSAnton Blanchard goto nomem; 8813441f04bSAnton Blanchard 8823441f04bSAnton Blanchard first = sg; 8833441f04bSAnton Blanchard 8843441f04bSAnton Blanchard while (vmalloc_size > 0) { 8853441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 8863441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 8873441f04bSAnton Blanchard 8883441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 8893441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 8903441f04bSAnton Blanchard i++; 8913441f04bSAnton Blanchard 8923441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 8933441f04bSAnton Blanchard struct opal_sg_list *next; 8943441f04bSAnton Blanchard 8953441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 8963441f04bSAnton Blanchard if (!next) 8973441f04bSAnton Blanchard goto nomem; 8983441f04bSAnton Blanchard 8993441f04bSAnton Blanchard sg->length = cpu_to_be64( 9003441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 9013441f04bSAnton Blanchard i = 0; 9023441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 9033441f04bSAnton Blanchard sg = next; 9043441f04bSAnton Blanchard } 9053441f04bSAnton Blanchard 9063441f04bSAnton Blanchard vmalloc_addr += length; 9073441f04bSAnton Blanchard vmalloc_size -= length; 9083441f04bSAnton Blanchard } 9093441f04bSAnton Blanchard 9103441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 9113441f04bSAnton Blanchard 9123441f04bSAnton Blanchard return first; 9133441f04bSAnton Blanchard 9143441f04bSAnton Blanchard nomem: 9153441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 9163441f04bSAnton Blanchard opal_free_sg_list(first); 9173441f04bSAnton Blanchard return NULL; 9183441f04bSAnton Blanchard } 9193441f04bSAnton Blanchard 9203441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 9213441f04bSAnton Blanchard { 9223441f04bSAnton Blanchard while (sg) { 9233441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 9243441f04bSAnton Blanchard 9253441f04bSAnton Blanchard kfree(sg); 9263441f04bSAnton Blanchard 9273441f04bSAnton Blanchard if (next) 9283441f04bSAnton Blanchard sg = __va(next); 9293441f04bSAnton Blanchard else 9303441f04bSAnton Blanchard sg = NULL; 9313441f04bSAnton Blanchard } 9323441f04bSAnton Blanchard } 93316b1d26eSNeelesh Gupta 934e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 935e3c5c2e0SCédric Le Goater { 936e3c5c2e0SCédric Le Goater switch (rc) { 937e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 938e3c5c2e0SCédric Le Goater 939e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 940e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 941e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 942e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 943e3c5c2e0SCédric Le Goater 944e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 945e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 946e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 947e3c5c2e0SCédric Le Goater default: 948e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 949e3c5c2e0SCédric Le Goater return -EIO; 950e3c5c2e0SCédric Le Goater } 951e3c5c2e0SCédric Le Goater } 952e3c5c2e0SCédric Le Goater 95316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 95416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 95516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 95616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 95716b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 95847083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 959