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> 26b14726c5SMichael Ellerman 27b14726c5SMichael Ellerman #include <asm/machdep.h> 2814a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 2914a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3036df96f8SMahesh Salgaonkar #include <asm/mce.h> 3114a43e69SBenjamin Herrenschmidt 3214a43e69SBenjamin Herrenschmidt #include "powernv.h" 3314a43e69SBenjamin Herrenschmidt 346f68b5e2SVasant Hegde /* /sys/firmware/opal */ 356f68b5e2SVasant Hegde struct kobject *opal_kobj; 366f68b5e2SVasant Hegde 3714a43e69SBenjamin Herrenschmidt struct opal { 3814a43e69SBenjamin Herrenschmidt u64 base; 3914a43e69SBenjamin Herrenschmidt u64 entry; 4055672ecfSMahesh Salgaonkar u64 size; 4114a43e69SBenjamin Herrenschmidt } opal; 4214a43e69SBenjamin Herrenschmidt 4355672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4455672ecfSMahesh Salgaonkar u64 start_addr; 4555672ecfSMahesh Salgaonkar u64 end_addr; 4655672ecfSMahesh Salgaonkar u64 recover_addr; 4755672ecfSMahesh Salgaonkar }; 4855672ecfSMahesh Salgaonkar 4955672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5055672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5155672ecfSMahesh Salgaonkar 52bfc36894SJoel Stanley struct device_node *opal_node; 5314a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 5473ed148aSBenjamin Herrenschmidt static unsigned int *opal_irqs; 5573ed148aSBenjamin Herrenschmidt static unsigned int opal_irq_count; 561bc98de2SGavin Shan static ATOMIC_NOTIFIER_HEAD(opal_notifier_head); 5724366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 581bc98de2SGavin Shan static DEFINE_SPINLOCK(opal_notifier_lock); 591bc98de2SGavin Shan static uint64_t last_notified_mask = 0x0ul; 601bc98de2SGavin Shan static atomic_t opal_notifier_hold = ATOMIC_INIT(0); 6114a43e69SBenjamin Herrenschmidt 624926616cSBenjamin Herrenschmidt static void opal_reinit_cores(void) 634926616cSBenjamin Herrenschmidt { 644926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 654926616cSBenjamin Herrenschmidt * 664926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 674926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 684926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 694926616cSBenjamin Herrenschmidt */ 704926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 714926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 724926616cSBenjamin Herrenschmidt #else 734926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 744926616cSBenjamin Herrenschmidt #endif 754926616cSBenjamin Herrenschmidt } 764926616cSBenjamin Herrenschmidt 7714a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 7814a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 7914a43e69SBenjamin Herrenschmidt { 8055672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 819d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 8214a43e69SBenjamin Herrenschmidt 8314a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 8414a43e69SBenjamin Herrenschmidt return 0; 8514a43e69SBenjamin Herrenschmidt 8614a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 8714a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 8855672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 8914a43e69SBenjamin Herrenschmidt 9055672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 9114a43e69SBenjamin Herrenschmidt return 1; 9214a43e69SBenjamin Herrenschmidt 9314a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 9414a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 9555672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 9614a43e69SBenjamin Herrenschmidt 979d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 9814a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 999d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 10014a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1019d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 10255672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 10314a43e69SBenjamin Herrenschmidt 10414a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPAL; 10575b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 10675b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 10775b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv3; 1089a4f5cd0SAnton Blanchard pr_info("OPAL V3 detected !\n"); 10975b93da4SBenjamin Herrenschmidt } else if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) { 11014a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 1119a4f5cd0SAnton Blanchard pr_info("OPAL V2 detected !\n"); 11214a43e69SBenjamin Herrenschmidt } else { 1139a4f5cd0SAnton Blanchard pr_info("OPAL V1 detected !\n"); 11414a43e69SBenjamin Herrenschmidt } 11514a43e69SBenjamin Herrenschmidt 1164926616cSBenjamin Herrenschmidt /* Reinit all cores with the right endian */ 1174926616cSBenjamin Herrenschmidt opal_reinit_cores(); 1184926616cSBenjamin Herrenschmidt 1194926616cSBenjamin Herrenschmidt /* Restore some bits */ 1204926616cSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 1214926616cSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 1224926616cSBenjamin Herrenschmidt 123c4463b37SJeremy Kerr return 1; 124c4463b37SJeremy Kerr } 125c4463b37SJeremy Kerr 12655672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 12755672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 12855672ecfSMahesh Salgaonkar { 1299d0c4dfeSRob Herring int i, psize, size; 13055672ecfSMahesh Salgaonkar const __be32 *prop; 13155672ecfSMahesh Salgaonkar 13255672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 13355672ecfSMahesh Salgaonkar return 0; 13455672ecfSMahesh Salgaonkar 1356e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 13655672ecfSMahesh Salgaonkar 13755672ecfSMahesh Salgaonkar if (!prop) 13855672ecfSMahesh Salgaonkar return 1; 13955672ecfSMahesh Salgaonkar 14055672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 14155672ecfSMahesh Salgaonkar 14255672ecfSMahesh Salgaonkar /* 1436e556b47SMahesh Salgaonkar * Calculate number of available entries. 1446e556b47SMahesh Salgaonkar * 1456e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1466e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1476e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1486e556b47SMahesh Salgaonkar */ 1496e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1506e556b47SMahesh Salgaonkar 1516e556b47SMahesh Salgaonkar /* Sanity check */ 1526e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1536e556b47SMahesh Salgaonkar return 1; 1546e556b47SMahesh Salgaonkar 1556e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1566e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1576e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1586e556b47SMahesh Salgaonkar 1596e556b47SMahesh Salgaonkar /* 16055672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 16155672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 16255672ecfSMahesh Salgaonkar * RMO region. 16355672ecfSMahesh Salgaonkar */ 16455672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 16555672ecfSMahesh Salgaonkar ppc64_rma_size)); 16655672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 16755672ecfSMahesh Salgaonkar 1686e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 16955672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17055672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 17155672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 17255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 17355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 17455672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 17555672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 17655672ecfSMahesh Salgaonkar 17755672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 17855672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 17955672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18055672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 18155672ecfSMahesh Salgaonkar } 18255672ecfSMahesh Salgaonkar return 1; 18355672ecfSMahesh Salgaonkar } 18455672ecfSMahesh Salgaonkar 185c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 186c4463b37SJeremy Kerr { 18729186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 188c4463b37SJeremy Kerr u64 glue; 189c4463b37SJeremy Kerr 190c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 191c4463b37SJeremy Kerr return -ENODEV; 192c4463b37SJeremy Kerr 19328446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 19428446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 195ed79ba9eSBenjamin Herrenschmidt */ 196ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 1976507955cSMahesh Salgaonkar 1986507955cSMahesh Salgaonkar /* 1996507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2006507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2016507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2026507955cSMahesh Salgaonkar * 2036507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2046507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2056507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2066507955cSMahesh Salgaonkar * 2076507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2086507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2096507955cSMahesh Salgaonkar */ 2106507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 2116507955cSMahesh Salgaonkar pr_info("opal: Old firmware detected, OPAL handles HMIs.\n"); 2126507955cSMahesh Salgaonkar opal_register_exception_handler( 2136507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2146507955cSMahesh Salgaonkar 0, glue); 2156507955cSMahesh Salgaonkar glue += 128; 2166507955cSMahesh Salgaonkar } 2176507955cSMahesh Salgaonkar 218ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 21929186097SBenjamin Herrenschmidt #endif 220ed79ba9eSBenjamin Herrenschmidt 221c4463b37SJeremy Kerr return 0; 22214a43e69SBenjamin Herrenschmidt } 223b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 224c4463b37SJeremy Kerr 2251bc98de2SGavin Shan int opal_notifier_register(struct notifier_block *nb) 2261bc98de2SGavin Shan { 2271bc98de2SGavin Shan if (!nb) { 2281bc98de2SGavin Shan pr_warning("%s: Invalid argument (%p)\n", 2291bc98de2SGavin Shan __func__, nb); 2301bc98de2SGavin Shan return -EINVAL; 2311bc98de2SGavin Shan } 2321bc98de2SGavin Shan 2331bc98de2SGavin Shan atomic_notifier_chain_register(&opal_notifier_head, nb); 2341bc98de2SGavin Shan return 0; 2351bc98de2SGavin Shan } 236798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_register); 237798af00cSBenjamin Herrenschmidt 238798af00cSBenjamin Herrenschmidt int opal_notifier_unregister(struct notifier_block *nb) 239798af00cSBenjamin Herrenschmidt { 240798af00cSBenjamin Herrenschmidt if (!nb) { 241798af00cSBenjamin Herrenschmidt pr_warning("%s: Invalid argument (%p)\n", 242798af00cSBenjamin Herrenschmidt __func__, nb); 243798af00cSBenjamin Herrenschmidt return -EINVAL; 244798af00cSBenjamin Herrenschmidt } 245798af00cSBenjamin Herrenschmidt 246798af00cSBenjamin Herrenschmidt atomic_notifier_chain_unregister(&opal_notifier_head, nb); 247798af00cSBenjamin Herrenschmidt return 0; 248798af00cSBenjamin Herrenschmidt } 249798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_unregister); 2501bc98de2SGavin Shan 2511bc98de2SGavin Shan static void opal_do_notifier(uint64_t events) 2521bc98de2SGavin Shan { 2531bc98de2SGavin Shan unsigned long flags; 2541bc98de2SGavin Shan uint64_t changed_mask; 2551bc98de2SGavin Shan 2561bc98de2SGavin Shan if (atomic_read(&opal_notifier_hold)) 2571bc98de2SGavin Shan return; 2581bc98de2SGavin Shan 2591bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2601bc98de2SGavin Shan changed_mask = last_notified_mask ^ events; 2611bc98de2SGavin Shan last_notified_mask = events; 2621bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2631bc98de2SGavin Shan 2641bc98de2SGavin Shan /* 2651bc98de2SGavin Shan * We feed with the event bits and changed bits for 2661bc98de2SGavin Shan * enough information to the callback. 2671bc98de2SGavin Shan */ 2681bc98de2SGavin Shan atomic_notifier_call_chain(&opal_notifier_head, 2691bc98de2SGavin Shan events, (void *)changed_mask); 2701bc98de2SGavin Shan } 2711bc98de2SGavin Shan 2721bc98de2SGavin Shan void opal_notifier_update_evt(uint64_t evt_mask, 2731bc98de2SGavin Shan uint64_t evt_val) 2741bc98de2SGavin Shan { 2751bc98de2SGavin Shan unsigned long flags; 2761bc98de2SGavin Shan 2771bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2781bc98de2SGavin Shan last_notified_mask &= ~evt_mask; 2791bc98de2SGavin Shan last_notified_mask |= evt_val; 2801bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2811bc98de2SGavin Shan } 2821bc98de2SGavin Shan 2831bc98de2SGavin Shan void opal_notifier_enable(void) 2841bc98de2SGavin Shan { 2851bc98de2SGavin Shan int64_t rc; 28656b4c993SAnton Blanchard __be64 evt = 0; 2871bc98de2SGavin Shan 2881bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 0); 2891bc98de2SGavin Shan 2901bc98de2SGavin Shan /* Process pending events */ 2911bc98de2SGavin Shan rc = opal_poll_events(&evt); 2921bc98de2SGavin Shan if (rc == OPAL_SUCCESS && evt) 29356b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(evt)); 2941bc98de2SGavin Shan } 2951bc98de2SGavin Shan 2961bc98de2SGavin Shan void opal_notifier_disable(void) 2971bc98de2SGavin Shan { 2981bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 1); 2991bc98de2SGavin Shan } 3001bc98de2SGavin Shan 30124366360SMahesh Salgaonkar /* 30224366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 30324366360SMahesh Salgaonkar * notified for specific messgae type. 30424366360SMahesh Salgaonkar */ 30524366360SMahesh Salgaonkar int opal_message_notifier_register(enum OpalMessageType msg_type, 30624366360SMahesh Salgaonkar struct notifier_block *nb) 30724366360SMahesh Salgaonkar { 30824366360SMahesh Salgaonkar if (!nb) { 30924366360SMahesh Salgaonkar pr_warning("%s: Invalid argument (%p)\n", 31024366360SMahesh Salgaonkar __func__, nb); 31124366360SMahesh Salgaonkar return -EINVAL; 31224366360SMahesh Salgaonkar } 31324366360SMahesh Salgaonkar if (msg_type > OPAL_MSG_TYPE_MAX) { 31424366360SMahesh Salgaonkar pr_warning("%s: Invalid message type argument (%d)\n", 31524366360SMahesh Salgaonkar __func__, msg_type); 31624366360SMahesh Salgaonkar return -EINVAL; 31724366360SMahesh Salgaonkar } 31824366360SMahesh Salgaonkar return atomic_notifier_chain_register( 31924366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 32024366360SMahesh Salgaonkar } 32124366360SMahesh Salgaonkar 32224366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 32324366360SMahesh Salgaonkar { 32424366360SMahesh Salgaonkar /* notify subscribers */ 32524366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 32624366360SMahesh Salgaonkar msg_type, msg); 32724366360SMahesh Salgaonkar } 32824366360SMahesh Salgaonkar 32924366360SMahesh Salgaonkar static void opal_handle_message(void) 33024366360SMahesh Salgaonkar { 33124366360SMahesh Salgaonkar s64 ret; 33224366360SMahesh Salgaonkar /* 33324366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 33424366360SMahesh Salgaonkar * value in /proc/device-tree. 33524366360SMahesh Salgaonkar */ 33624366360SMahesh Salgaonkar static struct opal_msg msg; 337bb4398e1SAnton Blanchard u32 type; 33824366360SMahesh Salgaonkar 33924366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 34024366360SMahesh Salgaonkar /* No opal message pending. */ 34124366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 34224366360SMahesh Salgaonkar return; 34324366360SMahesh Salgaonkar 34424366360SMahesh Salgaonkar /* check for errors. */ 34524366360SMahesh Salgaonkar if (ret) { 3461a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 34724366360SMahesh Salgaonkar __func__, ret); 34824366360SMahesh Salgaonkar return; 34924366360SMahesh Salgaonkar } 35024366360SMahesh Salgaonkar 351bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 352bb4398e1SAnton Blanchard 35324366360SMahesh Salgaonkar /* Sanity check */ 354bb4398e1SAnton Blanchard if (type > OPAL_MSG_TYPE_MAX) { 355bb4398e1SAnton Blanchard pr_warning("%s: Unknown message type: %u\n", __func__, type); 35624366360SMahesh Salgaonkar return; 35724366360SMahesh Salgaonkar } 358bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 35924366360SMahesh Salgaonkar } 36024366360SMahesh Salgaonkar 36124366360SMahesh Salgaonkar static int opal_message_notify(struct notifier_block *nb, 36224366360SMahesh Salgaonkar unsigned long events, void *change) 36324366360SMahesh Salgaonkar { 36424366360SMahesh Salgaonkar if (events & OPAL_EVENT_MSG_PENDING) 36524366360SMahesh Salgaonkar opal_handle_message(); 36624366360SMahesh Salgaonkar return 0; 36724366360SMahesh Salgaonkar } 36824366360SMahesh Salgaonkar 36924366360SMahesh Salgaonkar static struct notifier_block opal_message_nb = { 37024366360SMahesh Salgaonkar .notifier_call = opal_message_notify, 37124366360SMahesh Salgaonkar .next = NULL, 37224366360SMahesh Salgaonkar .priority = 0, 37324366360SMahesh Salgaonkar }; 37424366360SMahesh Salgaonkar 37524366360SMahesh Salgaonkar static int __init opal_message_init(void) 37624366360SMahesh Salgaonkar { 37724366360SMahesh Salgaonkar int ret, i; 37824366360SMahesh Salgaonkar 37924366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 38024366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 38124366360SMahesh Salgaonkar 38224366360SMahesh Salgaonkar ret = opal_notifier_register(&opal_message_nb); 38324366360SMahesh Salgaonkar if (ret) { 38424366360SMahesh Salgaonkar pr_err("%s: Can't register OPAL event notifier (%d)\n", 38524366360SMahesh Salgaonkar __func__, ret); 38624366360SMahesh Salgaonkar return ret; 38724366360SMahesh Salgaonkar } 38824366360SMahesh Salgaonkar return 0; 38924366360SMahesh Salgaonkar } 390b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_message_init); 39124366360SMahesh Salgaonkar 39214a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 39314a43e69SBenjamin Herrenschmidt { 3944f89363bSBenjamin Herrenschmidt s64 rc; 3954f89363bSBenjamin Herrenschmidt __be64 evt, len; 39614a43e69SBenjamin Herrenschmidt 39714a43e69SBenjamin Herrenschmidt if (!opal.entry) 398daea1175SBenjamin Herrenschmidt return -ENODEV; 39914a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4004f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 40114a43e69SBenjamin Herrenschmidt return 0; 4024f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 40314a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 40414a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 4054f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 40614a43e69SBenjamin Herrenschmidt return 0; 40714a43e69SBenjamin Herrenschmidt } 40814a43e69SBenjamin Herrenschmidt 40914a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 41014a43e69SBenjamin Herrenschmidt { 41114a43e69SBenjamin Herrenschmidt int written = 0; 4124f89363bSBenjamin Herrenschmidt __be64 olen; 413daea1175SBenjamin Herrenschmidt s64 len, rc; 41414a43e69SBenjamin Herrenschmidt unsigned long flags; 4154f89363bSBenjamin Herrenschmidt __be64 evt; 41614a43e69SBenjamin Herrenschmidt 41714a43e69SBenjamin Herrenschmidt if (!opal.entry) 418daea1175SBenjamin Herrenschmidt return -ENODEV; 41914a43e69SBenjamin Herrenschmidt 42014a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 42114a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 422daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 423daea1175SBenjamin Herrenschmidt * 424daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 425daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 426daea1175SBenjamin Herrenschmidt * enough room and be done with it 42714a43e69SBenjamin Herrenschmidt */ 42814a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 429daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 4304f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 4314f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 43214a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 43314a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 43414a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 43514a43e69SBenjamin Herrenschmidt if (rc) 43614a43e69SBenjamin Herrenschmidt return total_len; 4374f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 43814a43e69SBenjamin Herrenschmidt return -EAGAIN; 43914a43e69SBenjamin Herrenschmidt } 440daea1175SBenjamin Herrenschmidt } 44114a43e69SBenjamin Herrenschmidt 44214a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 44314a43e69SBenjamin Herrenschmidt * should no longer happen. 44414a43e69SBenjamin Herrenschmidt */ 445daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 44614a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 44714a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 4484f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 4494f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 4504f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 4511de1455fSBenjamin Herrenschmidt 4521de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 4531de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 4541de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 4551de1455fSBenjamin Herrenschmidt written = total_len; 4561de1455fSBenjamin Herrenschmidt break; 4571de1455fSBenjamin Herrenschmidt } 45814a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 45914a43e69SBenjamin Herrenschmidt total_len -= len; 46014a43e69SBenjamin Herrenschmidt data += len; 46114a43e69SBenjamin Herrenschmidt written += len; 46214a43e69SBenjamin Herrenschmidt } 46314a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 46414a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 46514a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 46614a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 46714a43e69SBenjamin Herrenschmidt */ 46814a43e69SBenjamin Herrenschmidt do 46914a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4704f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4714f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 47214a43e69SBenjamin Herrenschmidt } 47314a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 47414a43e69SBenjamin Herrenschmidt return written; 47514a43e69SBenjamin Herrenschmidt } 47614a43e69SBenjamin Herrenschmidt 477b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 478b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 479b63a0ffeSMahesh Salgaonkar { 480b63a0ffeSMahesh Salgaonkar int recovered = 0; 481b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 482b63a0ffeSMahesh Salgaonkar 483b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 484b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 485b63a0ffeSMahesh Salgaonkar recovered = 0; 486b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 487b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 488b63a0ffeSMahesh Salgaonkar recovered = 1; 489b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 490b63a0ffeSMahesh Salgaonkar /* 491b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 492b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 493b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 494b63a0ffeSMahesh Salgaonkar * in userspace. 495b63a0ffeSMahesh Salgaonkar * 496b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 497b63a0ffeSMahesh Salgaonkar */ 498b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 499b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 500b63a0ffeSMahesh Salgaonkar recovered = 1; 501b63a0ffeSMahesh Salgaonkar } else 502b63a0ffeSMahesh Salgaonkar recovered = 0; 503b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 504b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 505b63a0ffeSMahesh Salgaonkar /* 506b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 507b63a0ffeSMahesh Salgaonkar * kill the task. 508b63a0ffeSMahesh Salgaonkar */ 509b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 510b63a0ffeSMahesh Salgaonkar recovered = 1; 511b63a0ffeSMahesh Salgaonkar } 512b63a0ffeSMahesh Salgaonkar return recovered; 513b63a0ffeSMahesh Salgaonkar } 514b63a0ffeSMahesh Salgaonkar 515ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 516ed79ba9eSBenjamin Herrenschmidt { 51736df96f8SMahesh Salgaonkar struct machine_check_event evt; 518ed79ba9eSBenjamin Herrenschmidt 51936df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 52036df96f8SMahesh Salgaonkar return 0; 521ed79ba9eSBenjamin Herrenschmidt 522ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 52336df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 524ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 525ed79ba9eSBenjamin Herrenschmidt evt.version); 526ed79ba9eSBenjamin Herrenschmidt return 0; 527ed79ba9eSBenjamin Herrenschmidt } 528b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 529ed79ba9eSBenjamin Herrenschmidt 530b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 531b63a0ffeSMahesh Salgaonkar return 1; 532b63a0ffeSMahesh Salgaonkar return 0; 533ed79ba9eSBenjamin Herrenschmidt } 534ed79ba9eSBenjamin Herrenschmidt 5350869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 5360869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 5370869b6fdSMahesh Salgaonkar { 5380ef95b41SMahesh Salgaonkar s64 rc; 5390ef95b41SMahesh Salgaonkar 5400ef95b41SMahesh Salgaonkar /* 5410ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5420ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5430ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5440ef95b41SMahesh Salgaonkar */ 5450ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5460ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5470ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5480ef95b41SMahesh Salgaonkar return 1; 5490ef95b41SMahesh Salgaonkar } 5500869b6fdSMahesh Salgaonkar return 0; 5510869b6fdSMahesh Salgaonkar } 5520869b6fdSMahesh Salgaonkar 5530869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5540869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5550869b6fdSMahesh Salgaonkar { 5560ef95b41SMahesh Salgaonkar s64 rc; 5570ef95b41SMahesh Salgaonkar __be64 evt = 0; 5580ef95b41SMahesh Salgaonkar 5590ef95b41SMahesh Salgaonkar /* 5600ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5610ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5620ef95b41SMahesh Salgaonkar * process them. 5630ef95b41SMahesh Salgaonkar */ 5640ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5650869b6fdSMahesh Salgaonkar return 0; 5660ef95b41SMahesh Salgaonkar 5670ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5680ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 5690ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS && evt) 5700ef95b41SMahesh Salgaonkar opal_do_notifier(be64_to_cpu(evt)); 5710ef95b41SMahesh Salgaonkar 5720ef95b41SMahesh Salgaonkar return 1; 5730869b6fdSMahesh Salgaonkar } 5740869b6fdSMahesh Salgaonkar 57555672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 57655672ecfSMahesh Salgaonkar { 57755672ecfSMahesh Salgaonkar int i; 57855672ecfSMahesh Salgaonkar 57955672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 58055672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 58155672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 58255672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 58355672ecfSMahesh Salgaonkar return 0; 58455672ecfSMahesh Salgaonkar } 58555672ecfSMahesh Salgaonkar 58655672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 58755672ecfSMahesh Salgaonkar { 58855672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 58955672ecfSMahesh Salgaonkar 59055672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 59155672ecfSMahesh Salgaonkar goto out; 59255672ecfSMahesh Salgaonkar 59355672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 59455672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 59555672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 59655672ecfSMahesh Salgaonkar 59755672ecfSMahesh Salgaonkar /* 59855672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 59955672ecfSMahesh Salgaonkar */ 60055672ecfSMahesh Salgaonkar if (recover_addr) 60155672ecfSMahesh Salgaonkar regs->nip = recover_addr; 60255672ecfSMahesh Salgaonkar 60355672ecfSMahesh Salgaonkar out: 60455672ecfSMahesh Salgaonkar return !!recover_addr; 60555672ecfSMahesh Salgaonkar } 60655672ecfSMahesh Salgaonkar 607a125e092SBenjamin Herrenschmidt static irqreturn_t opal_interrupt(int irq, void *data) 608a125e092SBenjamin Herrenschmidt { 6095e4da530SAnton Blanchard __be64 events; 610a125e092SBenjamin Herrenschmidt 611a125e092SBenjamin Herrenschmidt opal_handle_interrupt(virq_to_hw(irq), &events); 612a125e092SBenjamin Herrenschmidt 61356b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(events)); 614a125e092SBenjamin Herrenschmidt 615a125e092SBenjamin Herrenschmidt return IRQ_HANDLED; 616a125e092SBenjamin Herrenschmidt } 617a125e092SBenjamin Herrenschmidt 6186f68b5e2SVasant Hegde static int opal_sysfs_init(void) 6196f68b5e2SVasant Hegde { 6206f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 6216f68b5e2SVasant Hegde if (!opal_kobj) { 6226f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 6236f68b5e2SVasant Hegde return -ENOMEM; 6246f68b5e2SVasant Hegde } 6256f68b5e2SVasant Hegde 6266f68b5e2SVasant Hegde return 0; 6276f68b5e2SVasant Hegde } 6286f68b5e2SVasant Hegde 629c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 630c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 631c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 632c8742f85SBenjamin Herrenschmidt { 633c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 634c8742f85SBenjamin Herrenschmidt bin_attr->size); 635c8742f85SBenjamin Herrenschmidt } 636c8742f85SBenjamin Herrenschmidt 637c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 638c8742f85SBenjamin Herrenschmidt 639c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 640c8742f85SBenjamin Herrenschmidt { 641c8742f85SBenjamin Herrenschmidt const __be64 *syms; 642c8742f85SBenjamin Herrenschmidt unsigned int size; 643c8742f85SBenjamin Herrenschmidt struct device_node *fw; 644c8742f85SBenjamin Herrenschmidt int rc; 645c8742f85SBenjamin Herrenschmidt 646c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 647c8742f85SBenjamin Herrenschmidt if (!fw) 648c8742f85SBenjamin Herrenschmidt return; 649c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 650c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 651c8742f85SBenjamin Herrenschmidt return; 652c8742f85SBenjamin Herrenschmidt 653c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 654c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 655c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 656c8742f85SBenjamin Herrenschmidt 657c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 658c8742f85SBenjamin Herrenschmidt if (rc) 659c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 660c8742f85SBenjamin Herrenschmidt } 661c8742f85SBenjamin Herrenschmidt 662b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 663b09c2ec4SVasant Hegde { 664b09c2ec4SVasant Hegde void *addr; 665b09c2ec4SVasant Hegde uint64_t size; 666b09c2ec4SVasant Hegde int rc; 667b09c2ec4SVasant Hegde 668b09c2ec4SVasant Hegde /* Register kernel log buffer */ 669b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 670b09c2ec4SVasant Hegde size = log_buf_len_get(); 671b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 672b09c2ec4SVasant Hegde __pa(addr), size); 673b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 674b09c2ec4SVasant Hegde * know about that call 675b09c2ec4SVasant Hegde */ 676b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 677b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 678b09c2ec4SVasant Hegde "rc = %d\n", rc); 679b09c2ec4SVasant Hegde } 680608b286dSJeremy Kerr 681608b286dSJeremy Kerr static void opal_ipmi_init(struct device_node *opal_node) 682608b286dSJeremy Kerr { 683608b286dSJeremy Kerr struct device_node *np; 684608b286dSJeremy Kerr 685608b286dSJeremy Kerr for_each_child_of_node(opal_node, np) 686608b286dSJeremy Kerr if (of_device_is_compatible(np, "ibm,opal-ipmi")) 687608b286dSJeremy Kerr of_platform_device_create(np, NULL, NULL); 688608b286dSJeremy Kerr } 689608b286dSJeremy Kerr 69047083450SNeelesh Gupta static void opal_i2c_create_devs(void) 69147083450SNeelesh Gupta { 69247083450SNeelesh Gupta struct device_node *np; 69347083450SNeelesh Gupta 69447083450SNeelesh Gupta for_each_compatible_node(np, NULL, "ibm,opal-i2c") 69547083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 69647083450SNeelesh Gupta } 69747083450SNeelesh Gupta 69814a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 69914a43e69SBenjamin Herrenschmidt { 70014a43e69SBenjamin Herrenschmidt struct device_node *np, *consoles; 7011cc79bc8SAlistair Popple const __be32 *irqs; 702a125e092SBenjamin Herrenschmidt int rc, i, irqlen; 70314a43e69SBenjamin Herrenschmidt 70414a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 70514a43e69SBenjamin Herrenschmidt if (!opal_node) { 70614a43e69SBenjamin Herrenschmidt pr_warn("opal: Node not found\n"); 70714a43e69SBenjamin Herrenschmidt return -ENODEV; 70814a43e69SBenjamin Herrenschmidt } 7092db29d28SBenjamin Herrenschmidt 7102db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 71114a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 71214a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 71314a43e69SBenjamin Herrenschmidt else 71414a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 7152db29d28SBenjamin Herrenschmidt if (consoles) { 71614a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 71714a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 71814a43e69SBenjamin Herrenschmidt continue; 71914a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 72014a43e69SBenjamin Herrenschmidt } 72114a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7222db29d28SBenjamin Herrenschmidt } 723a125e092SBenjamin Herrenschmidt 72447083450SNeelesh Gupta /* Create i2c platform devices */ 72547083450SNeelesh Gupta opal_i2c_create_devs(); 72647083450SNeelesh Gupta 727a125e092SBenjamin Herrenschmidt /* Find all OPAL interrupts and request them */ 728a125e092SBenjamin Herrenschmidt irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 729a125e092SBenjamin Herrenschmidt pr_debug("opal: Found %d interrupts reserved for OPAL\n", 730a125e092SBenjamin Herrenschmidt irqs ? (irqlen / 4) : 0); 73173ed148aSBenjamin Herrenschmidt opal_irq_count = irqlen / 4; 73273ed148aSBenjamin Herrenschmidt opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 733a125e092SBenjamin Herrenschmidt for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { 734a125e092SBenjamin Herrenschmidt unsigned int hwirq = be32_to_cpup(irqs); 735a125e092SBenjamin Herrenschmidt unsigned int irq = irq_create_mapping(NULL, hwirq); 736a125e092SBenjamin Herrenschmidt if (irq == NO_IRQ) { 737a125e092SBenjamin Herrenschmidt pr_warning("opal: Failed to map irq 0x%x\n", hwirq); 738a125e092SBenjamin Herrenschmidt continue; 739a125e092SBenjamin Herrenschmidt } 740a125e092SBenjamin Herrenschmidt rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); 741a125e092SBenjamin Herrenschmidt if (rc) 742a125e092SBenjamin Herrenschmidt pr_warning("opal: Error %d requesting irq %d" 743a125e092SBenjamin Herrenschmidt " (0x%x)\n", rc, irq, hwirq); 74473ed148aSBenjamin Herrenschmidt opal_irqs[i] = irq; 745a125e092SBenjamin Herrenschmidt } 7466f68b5e2SVasant Hegde 7476f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 7486f68b5e2SVasant Hegde rc = opal_sysfs_init(); 74950bd6153SVasant Hegde if (rc == 0) { 750c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 751c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 752b09c2ec4SVasant Hegde /* Setup dump region interface */ 753b09c2ec4SVasant Hegde opal_dump_region_init(); 754774fea1aSStewart Smith /* Setup error log interface */ 755774fea1aSStewart Smith rc = opal_elog_init(); 75650bd6153SVasant Hegde /* Setup code update interface */ 75750bd6153SVasant Hegde opal_flash_init(); 758c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 759c7e64b9cSStewart Smith opal_platform_dump_init(); 7604029cd66SNeelesh Gupta /* Setup system parameters interface */ 7614029cd66SNeelesh Gupta opal_sys_param_init(); 762bfc36894SJoel Stanley /* Setup message log interface. */ 763bfc36894SJoel Stanley opal_msglog_init(); 76450bd6153SVasant Hegde } 7656f68b5e2SVasant Hegde 766608b286dSJeremy Kerr opal_ipmi_init(opal_node); 767608b286dSJeremy Kerr 76814a43e69SBenjamin Herrenschmidt return 0; 76914a43e69SBenjamin Herrenschmidt } 770b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 77173ed148aSBenjamin Herrenschmidt 77273ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 77373ed148aSBenjamin Herrenschmidt { 77473ed148aSBenjamin Herrenschmidt unsigned int i; 775f7d98d18SVasant Hegde long rc = OPAL_BUSY; 77673ed148aSBenjamin Herrenschmidt 777f7d98d18SVasant Hegde /* First free interrupts, which will also mask them */ 77873ed148aSBenjamin Herrenschmidt for (i = 0; i < opal_irq_count; i++) { 77973ed148aSBenjamin Herrenschmidt if (opal_irqs[i]) 780b0d436c7SAnton Blanchard free_irq(opal_irqs[i], NULL); 78173ed148aSBenjamin Herrenschmidt opal_irqs[i] = 0; 78273ed148aSBenjamin Herrenschmidt } 783f7d98d18SVasant Hegde 784f7d98d18SVasant Hegde /* 785f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 786f7d98d18SVasant Hegde * potentially write to our memory has completed such 787f7d98d18SVasant Hegde * as an ongoing dump retrieval 788f7d98d18SVasant Hegde */ 789f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 790f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 791f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 792f7d98d18SVasant Hegde opal_poll_events(NULL); 793f7d98d18SVasant Hegde else 794f7d98d18SVasant Hegde mdelay(10); 795f7d98d18SVasant Hegde } 796b09c2ec4SVasant Hegde 797b09c2ec4SVasant Hegde /* Unregister memory dump region */ 798b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 79973ed148aSBenjamin Herrenschmidt } 800e28b05e7SJoel Stanley 801e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 802e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 803608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 804608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 8053441f04bSAnton Blanchard 8063441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 8073441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 8083441f04bSAnton Blanchard unsigned long vmalloc_size) 8093441f04bSAnton Blanchard { 8103441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 8113441f04bSAnton Blanchard unsigned long i = 0; 8123441f04bSAnton Blanchard 8133441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 8143441f04bSAnton Blanchard if (!sg) 8153441f04bSAnton Blanchard goto nomem; 8163441f04bSAnton Blanchard 8173441f04bSAnton Blanchard first = sg; 8183441f04bSAnton Blanchard 8193441f04bSAnton Blanchard while (vmalloc_size > 0) { 8203441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 8213441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 8223441f04bSAnton Blanchard 8233441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 8243441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 8253441f04bSAnton Blanchard i++; 8263441f04bSAnton Blanchard 8273441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 8283441f04bSAnton Blanchard struct opal_sg_list *next; 8293441f04bSAnton Blanchard 8303441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 8313441f04bSAnton Blanchard if (!next) 8323441f04bSAnton Blanchard goto nomem; 8333441f04bSAnton Blanchard 8343441f04bSAnton Blanchard sg->length = cpu_to_be64( 8353441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 8363441f04bSAnton Blanchard i = 0; 8373441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 8383441f04bSAnton Blanchard sg = next; 8393441f04bSAnton Blanchard } 8403441f04bSAnton Blanchard 8413441f04bSAnton Blanchard vmalloc_addr += length; 8423441f04bSAnton Blanchard vmalloc_size -= length; 8433441f04bSAnton Blanchard } 8443441f04bSAnton Blanchard 8453441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 8463441f04bSAnton Blanchard 8473441f04bSAnton Blanchard return first; 8483441f04bSAnton Blanchard 8493441f04bSAnton Blanchard nomem: 8503441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 8513441f04bSAnton Blanchard opal_free_sg_list(first); 8523441f04bSAnton Blanchard return NULL; 8533441f04bSAnton Blanchard } 8543441f04bSAnton Blanchard 8553441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 8563441f04bSAnton Blanchard { 8573441f04bSAnton Blanchard while (sg) { 8583441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 8593441f04bSAnton Blanchard 8603441f04bSAnton Blanchard kfree(sg); 8613441f04bSAnton Blanchard 8623441f04bSAnton Blanchard if (next) 8633441f04bSAnton Blanchard sg = __va(next); 8643441f04bSAnton Blanchard else 8653441f04bSAnton Blanchard sg = NULL; 8663441f04bSAnton Blanchard } 8673441f04bSAnton Blanchard } 86816b1d26eSNeelesh Gupta 86916b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 87016b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 87116b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 87216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 87316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 87447083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 875