114a43e69SBenjamin Herrenschmidt /* 214a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 314a43e69SBenjamin Herrenschmidt * 414a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 514a43e69SBenjamin Herrenschmidt * 614a43e69SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 714a43e69SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 814a43e69SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 914a43e69SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1014a43e69SBenjamin Herrenschmidt */ 1114a43e69SBenjamin Herrenschmidt 1214a43e69SBenjamin Herrenschmidt #undef DEBUG 1314a43e69SBenjamin Herrenschmidt 1414a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1514a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1626a2056eSRob Herring #include <linux/of_fdt.h> 1714a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 18a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 191bc98de2SGavin Shan #include <linux/notifier.h> 2073ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 21b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 226f68b5e2SVasant Hegde #include <linux/kobject.h> 23f7d98d18SVasant Hegde #include <linux/delay.h> 2455672ecfSMahesh Salgaonkar #include <linux/memblock.h> 25b14726c5SMichael Ellerman 26b14726c5SMichael Ellerman #include <asm/machdep.h> 2714a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 2814a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 2936df96f8SMahesh Salgaonkar #include <asm/mce.h> 3014a43e69SBenjamin Herrenschmidt 3114a43e69SBenjamin Herrenschmidt #include "powernv.h" 3214a43e69SBenjamin Herrenschmidt 336f68b5e2SVasant Hegde /* /sys/firmware/opal */ 346f68b5e2SVasant Hegde struct kobject *opal_kobj; 356f68b5e2SVasant Hegde 3614a43e69SBenjamin Herrenschmidt struct opal { 3714a43e69SBenjamin Herrenschmidt u64 base; 3814a43e69SBenjamin Herrenschmidt u64 entry; 3955672ecfSMahesh Salgaonkar u64 size; 4014a43e69SBenjamin Herrenschmidt } opal; 4114a43e69SBenjamin Herrenschmidt 4255672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4355672ecfSMahesh Salgaonkar u64 start_addr; 4455672ecfSMahesh Salgaonkar u64 end_addr; 4555672ecfSMahesh Salgaonkar u64 recover_addr; 4655672ecfSMahesh Salgaonkar }; 4755672ecfSMahesh Salgaonkar 4855672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 4955672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5055672ecfSMahesh Salgaonkar 51bfc36894SJoel Stanley struct device_node *opal_node; 5214a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 53ed79ba9eSBenjamin Herrenschmidt extern u64 opal_mc_secondary_handler[]; 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; 197ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 19829186097SBenjamin Herrenschmidt #endif 199ed79ba9eSBenjamin Herrenschmidt 200c4463b37SJeremy Kerr return 0; 20114a43e69SBenjamin Herrenschmidt } 202b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 203c4463b37SJeremy Kerr 2041bc98de2SGavin Shan int opal_notifier_register(struct notifier_block *nb) 2051bc98de2SGavin Shan { 2061bc98de2SGavin Shan if (!nb) { 2071bc98de2SGavin Shan pr_warning("%s: Invalid argument (%p)\n", 2081bc98de2SGavin Shan __func__, nb); 2091bc98de2SGavin Shan return -EINVAL; 2101bc98de2SGavin Shan } 2111bc98de2SGavin Shan 2121bc98de2SGavin Shan atomic_notifier_chain_register(&opal_notifier_head, nb); 2131bc98de2SGavin Shan return 0; 2141bc98de2SGavin Shan } 215798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_register); 216798af00cSBenjamin Herrenschmidt 217798af00cSBenjamin Herrenschmidt int opal_notifier_unregister(struct notifier_block *nb) 218798af00cSBenjamin Herrenschmidt { 219798af00cSBenjamin Herrenschmidt if (!nb) { 220798af00cSBenjamin Herrenschmidt pr_warning("%s: Invalid argument (%p)\n", 221798af00cSBenjamin Herrenschmidt __func__, nb); 222798af00cSBenjamin Herrenschmidt return -EINVAL; 223798af00cSBenjamin Herrenschmidt } 224798af00cSBenjamin Herrenschmidt 225798af00cSBenjamin Herrenschmidt atomic_notifier_chain_unregister(&opal_notifier_head, nb); 226798af00cSBenjamin Herrenschmidt return 0; 227798af00cSBenjamin Herrenschmidt } 228798af00cSBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_notifier_unregister); 2291bc98de2SGavin Shan 2301bc98de2SGavin Shan static void opal_do_notifier(uint64_t events) 2311bc98de2SGavin Shan { 2321bc98de2SGavin Shan unsigned long flags; 2331bc98de2SGavin Shan uint64_t changed_mask; 2341bc98de2SGavin Shan 2351bc98de2SGavin Shan if (atomic_read(&opal_notifier_hold)) 2361bc98de2SGavin Shan return; 2371bc98de2SGavin Shan 2381bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2391bc98de2SGavin Shan changed_mask = last_notified_mask ^ events; 2401bc98de2SGavin Shan last_notified_mask = events; 2411bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2421bc98de2SGavin Shan 2431bc98de2SGavin Shan /* 2441bc98de2SGavin Shan * We feed with the event bits and changed bits for 2451bc98de2SGavin Shan * enough information to the callback. 2461bc98de2SGavin Shan */ 2471bc98de2SGavin Shan atomic_notifier_call_chain(&opal_notifier_head, 2481bc98de2SGavin Shan events, (void *)changed_mask); 2491bc98de2SGavin Shan } 2501bc98de2SGavin Shan 2511bc98de2SGavin Shan void opal_notifier_update_evt(uint64_t evt_mask, 2521bc98de2SGavin Shan uint64_t evt_val) 2531bc98de2SGavin Shan { 2541bc98de2SGavin Shan unsigned long flags; 2551bc98de2SGavin Shan 2561bc98de2SGavin Shan spin_lock_irqsave(&opal_notifier_lock, flags); 2571bc98de2SGavin Shan last_notified_mask &= ~evt_mask; 2581bc98de2SGavin Shan last_notified_mask |= evt_val; 2591bc98de2SGavin Shan spin_unlock_irqrestore(&opal_notifier_lock, flags); 2601bc98de2SGavin Shan } 2611bc98de2SGavin Shan 2621bc98de2SGavin Shan void opal_notifier_enable(void) 2631bc98de2SGavin Shan { 2641bc98de2SGavin Shan int64_t rc; 26556b4c993SAnton Blanchard __be64 evt = 0; 2661bc98de2SGavin Shan 2671bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 0); 2681bc98de2SGavin Shan 2691bc98de2SGavin Shan /* Process pending events */ 2701bc98de2SGavin Shan rc = opal_poll_events(&evt); 2711bc98de2SGavin Shan if (rc == OPAL_SUCCESS && evt) 27256b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(evt)); 2731bc98de2SGavin Shan } 2741bc98de2SGavin Shan 2751bc98de2SGavin Shan void opal_notifier_disable(void) 2761bc98de2SGavin Shan { 2771bc98de2SGavin Shan atomic_set(&opal_notifier_hold, 1); 2781bc98de2SGavin Shan } 2791bc98de2SGavin Shan 28024366360SMahesh Salgaonkar /* 28124366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 28224366360SMahesh Salgaonkar * notified for specific messgae type. 28324366360SMahesh Salgaonkar */ 28424366360SMahesh Salgaonkar int opal_message_notifier_register(enum OpalMessageType msg_type, 28524366360SMahesh Salgaonkar struct notifier_block *nb) 28624366360SMahesh Salgaonkar { 28724366360SMahesh Salgaonkar if (!nb) { 28824366360SMahesh Salgaonkar pr_warning("%s: Invalid argument (%p)\n", 28924366360SMahesh Salgaonkar __func__, nb); 29024366360SMahesh Salgaonkar return -EINVAL; 29124366360SMahesh Salgaonkar } 29224366360SMahesh Salgaonkar if (msg_type > OPAL_MSG_TYPE_MAX) { 29324366360SMahesh Salgaonkar pr_warning("%s: Invalid message type argument (%d)\n", 29424366360SMahesh Salgaonkar __func__, msg_type); 29524366360SMahesh Salgaonkar return -EINVAL; 29624366360SMahesh Salgaonkar } 29724366360SMahesh Salgaonkar return atomic_notifier_chain_register( 29824366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 29924366360SMahesh Salgaonkar } 30024366360SMahesh Salgaonkar 30124366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 30224366360SMahesh Salgaonkar { 30324366360SMahesh Salgaonkar /* notify subscribers */ 30424366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 30524366360SMahesh Salgaonkar msg_type, msg); 30624366360SMahesh Salgaonkar } 30724366360SMahesh Salgaonkar 30824366360SMahesh Salgaonkar static void opal_handle_message(void) 30924366360SMahesh Salgaonkar { 31024366360SMahesh Salgaonkar s64 ret; 31124366360SMahesh Salgaonkar /* 31224366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 31324366360SMahesh Salgaonkar * value in /proc/device-tree. 31424366360SMahesh Salgaonkar */ 31524366360SMahesh Salgaonkar static struct opal_msg msg; 316bb4398e1SAnton Blanchard u32 type; 31724366360SMahesh Salgaonkar 31824366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 31924366360SMahesh Salgaonkar /* No opal message pending. */ 32024366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 32124366360SMahesh Salgaonkar return; 32224366360SMahesh Salgaonkar 32324366360SMahesh Salgaonkar /* check for errors. */ 32424366360SMahesh Salgaonkar if (ret) { 32524366360SMahesh Salgaonkar pr_warning("%s: Failed to retrive opal message, err=%lld\n", 32624366360SMahesh Salgaonkar __func__, ret); 32724366360SMahesh Salgaonkar return; 32824366360SMahesh Salgaonkar } 32924366360SMahesh Salgaonkar 330bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 331bb4398e1SAnton Blanchard 33224366360SMahesh Salgaonkar /* Sanity check */ 333bb4398e1SAnton Blanchard if (type > OPAL_MSG_TYPE_MAX) { 334bb4398e1SAnton Blanchard pr_warning("%s: Unknown message type: %u\n", __func__, type); 33524366360SMahesh Salgaonkar return; 33624366360SMahesh Salgaonkar } 337bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 33824366360SMahesh Salgaonkar } 33924366360SMahesh Salgaonkar 34024366360SMahesh Salgaonkar static int opal_message_notify(struct notifier_block *nb, 34124366360SMahesh Salgaonkar unsigned long events, void *change) 34224366360SMahesh Salgaonkar { 34324366360SMahesh Salgaonkar if (events & OPAL_EVENT_MSG_PENDING) 34424366360SMahesh Salgaonkar opal_handle_message(); 34524366360SMahesh Salgaonkar return 0; 34624366360SMahesh Salgaonkar } 34724366360SMahesh Salgaonkar 34824366360SMahesh Salgaonkar static struct notifier_block opal_message_nb = { 34924366360SMahesh Salgaonkar .notifier_call = opal_message_notify, 35024366360SMahesh Salgaonkar .next = NULL, 35124366360SMahesh Salgaonkar .priority = 0, 35224366360SMahesh Salgaonkar }; 35324366360SMahesh Salgaonkar 35424366360SMahesh Salgaonkar static int __init opal_message_init(void) 35524366360SMahesh Salgaonkar { 35624366360SMahesh Salgaonkar int ret, i; 35724366360SMahesh Salgaonkar 35824366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 35924366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 36024366360SMahesh Salgaonkar 36124366360SMahesh Salgaonkar ret = opal_notifier_register(&opal_message_nb); 36224366360SMahesh Salgaonkar if (ret) { 36324366360SMahesh Salgaonkar pr_err("%s: Can't register OPAL event notifier (%d)\n", 36424366360SMahesh Salgaonkar __func__, ret); 36524366360SMahesh Salgaonkar return ret; 36624366360SMahesh Salgaonkar } 36724366360SMahesh Salgaonkar return 0; 36824366360SMahesh Salgaonkar } 369b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_message_init); 37024366360SMahesh Salgaonkar 37114a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 37214a43e69SBenjamin Herrenschmidt { 3734f89363bSBenjamin Herrenschmidt s64 rc; 3744f89363bSBenjamin Herrenschmidt __be64 evt, len; 37514a43e69SBenjamin Herrenschmidt 37614a43e69SBenjamin Herrenschmidt if (!opal.entry) 377daea1175SBenjamin Herrenschmidt return -ENODEV; 37814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3794f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 38014a43e69SBenjamin Herrenschmidt return 0; 3814f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 38214a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 38314a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3844f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 38514a43e69SBenjamin Herrenschmidt return 0; 38614a43e69SBenjamin Herrenschmidt } 38714a43e69SBenjamin Herrenschmidt 38814a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 38914a43e69SBenjamin Herrenschmidt { 39014a43e69SBenjamin Herrenschmidt int written = 0; 3914f89363bSBenjamin Herrenschmidt __be64 olen; 392daea1175SBenjamin Herrenschmidt s64 len, rc; 39314a43e69SBenjamin Herrenschmidt unsigned long flags; 3944f89363bSBenjamin Herrenschmidt __be64 evt; 39514a43e69SBenjamin Herrenschmidt 39614a43e69SBenjamin Herrenschmidt if (!opal.entry) 397daea1175SBenjamin Herrenschmidt return -ENODEV; 39814a43e69SBenjamin Herrenschmidt 39914a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 40014a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 401daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 402daea1175SBenjamin Herrenschmidt * 403daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 404daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 405daea1175SBenjamin Herrenschmidt * enough room and be done with it 40614a43e69SBenjamin Herrenschmidt */ 40714a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 408daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 4094f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 4104f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 41114a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 41214a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 41314a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 41414a43e69SBenjamin Herrenschmidt if (rc) 41514a43e69SBenjamin Herrenschmidt return total_len; 4164f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 41714a43e69SBenjamin Herrenschmidt return -EAGAIN; 41814a43e69SBenjamin Herrenschmidt } 419daea1175SBenjamin Herrenschmidt } 42014a43e69SBenjamin Herrenschmidt 42114a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 42214a43e69SBenjamin Herrenschmidt * should no longer happen. 42314a43e69SBenjamin Herrenschmidt */ 424daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 42514a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 42614a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 4274f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 4284f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 4294f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 4301de1455fSBenjamin Herrenschmidt 4311de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 4321de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 4331de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 4341de1455fSBenjamin Herrenschmidt written = total_len; 4351de1455fSBenjamin Herrenschmidt break; 4361de1455fSBenjamin Herrenschmidt } 43714a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 43814a43e69SBenjamin Herrenschmidt total_len -= len; 43914a43e69SBenjamin Herrenschmidt data += len; 44014a43e69SBenjamin Herrenschmidt written += len; 44114a43e69SBenjamin Herrenschmidt } 44214a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 44314a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 44414a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 44514a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 44614a43e69SBenjamin Herrenschmidt */ 44714a43e69SBenjamin Herrenschmidt do 44814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4494f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4504f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 45114a43e69SBenjamin Herrenschmidt } 45214a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 45314a43e69SBenjamin Herrenschmidt return written; 45414a43e69SBenjamin Herrenschmidt } 45514a43e69SBenjamin Herrenschmidt 456b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 457b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 458b63a0ffeSMahesh Salgaonkar { 459b63a0ffeSMahesh Salgaonkar int recovered = 0; 460b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 461b63a0ffeSMahesh Salgaonkar 462b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 463b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 464b63a0ffeSMahesh Salgaonkar recovered = 0; 465b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 466b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 467b63a0ffeSMahesh Salgaonkar recovered = 1; 468b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 469b63a0ffeSMahesh Salgaonkar /* 470b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 471b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 472b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 473b63a0ffeSMahesh Salgaonkar * in userspace. 474b63a0ffeSMahesh Salgaonkar * 475b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 476b63a0ffeSMahesh Salgaonkar */ 477b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 478b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 479b63a0ffeSMahesh Salgaonkar recovered = 1; 480b63a0ffeSMahesh Salgaonkar } else 481b63a0ffeSMahesh Salgaonkar recovered = 0; 482b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 483b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 484b63a0ffeSMahesh Salgaonkar /* 485b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 486b63a0ffeSMahesh Salgaonkar * kill the task. 487b63a0ffeSMahesh Salgaonkar */ 488b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 489b63a0ffeSMahesh Salgaonkar recovered = 1; 490b63a0ffeSMahesh Salgaonkar } 491b63a0ffeSMahesh Salgaonkar return recovered; 492b63a0ffeSMahesh Salgaonkar } 493b63a0ffeSMahesh Salgaonkar 494ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 495ed79ba9eSBenjamin Herrenschmidt { 49636df96f8SMahesh Salgaonkar struct machine_check_event evt; 497ed79ba9eSBenjamin Herrenschmidt 49836df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 49936df96f8SMahesh Salgaonkar return 0; 500ed79ba9eSBenjamin Herrenschmidt 501ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 50236df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 503ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 504ed79ba9eSBenjamin Herrenschmidt evt.version); 505ed79ba9eSBenjamin Herrenschmidt return 0; 506ed79ba9eSBenjamin Herrenschmidt } 507b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 508ed79ba9eSBenjamin Herrenschmidt 509b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 510b63a0ffeSMahesh Salgaonkar return 1; 511b63a0ffeSMahesh Salgaonkar return 0; 512ed79ba9eSBenjamin Herrenschmidt } 513ed79ba9eSBenjamin Herrenschmidt 5140869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 5150869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 5160869b6fdSMahesh Salgaonkar { 5170ef95b41SMahesh Salgaonkar s64 rc; 5180ef95b41SMahesh Salgaonkar 5190ef95b41SMahesh Salgaonkar /* 5200ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5210ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5220ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5230ef95b41SMahesh Salgaonkar */ 5240ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5250ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5260ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5270ef95b41SMahesh Salgaonkar return 1; 5280ef95b41SMahesh Salgaonkar } 5290869b6fdSMahesh Salgaonkar return 0; 5300869b6fdSMahesh Salgaonkar } 5310869b6fdSMahesh Salgaonkar 5320869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5330869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5340869b6fdSMahesh Salgaonkar { 5350ef95b41SMahesh Salgaonkar s64 rc; 5360ef95b41SMahesh Salgaonkar __be64 evt = 0; 5370ef95b41SMahesh Salgaonkar 5380ef95b41SMahesh Salgaonkar /* 5390ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5400ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5410ef95b41SMahesh Salgaonkar * process them. 5420ef95b41SMahesh Salgaonkar */ 5430ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5440869b6fdSMahesh Salgaonkar return 0; 5450ef95b41SMahesh Salgaonkar 5460ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5470ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 5480ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS && evt) 5490ef95b41SMahesh Salgaonkar opal_do_notifier(be64_to_cpu(evt)); 5500ef95b41SMahesh Salgaonkar 5510ef95b41SMahesh Salgaonkar return 1; 5520869b6fdSMahesh Salgaonkar } 5530869b6fdSMahesh Salgaonkar 55455672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 55555672ecfSMahesh Salgaonkar { 55655672ecfSMahesh Salgaonkar int i; 55755672ecfSMahesh Salgaonkar 55855672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 55955672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 56055672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 56155672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 56255672ecfSMahesh Salgaonkar return 0; 56355672ecfSMahesh Salgaonkar } 56455672ecfSMahesh Salgaonkar 56555672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 56655672ecfSMahesh Salgaonkar { 56755672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 56855672ecfSMahesh Salgaonkar 56955672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 57055672ecfSMahesh Salgaonkar goto out; 57155672ecfSMahesh Salgaonkar 57255672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 57355672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 57455672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 57555672ecfSMahesh Salgaonkar 57655672ecfSMahesh Salgaonkar /* 57755672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 57855672ecfSMahesh Salgaonkar */ 57955672ecfSMahesh Salgaonkar if (recover_addr) 58055672ecfSMahesh Salgaonkar regs->nip = recover_addr; 58155672ecfSMahesh Salgaonkar 58255672ecfSMahesh Salgaonkar out: 58355672ecfSMahesh Salgaonkar return !!recover_addr; 58455672ecfSMahesh Salgaonkar } 58555672ecfSMahesh Salgaonkar 586a125e092SBenjamin Herrenschmidt static irqreturn_t opal_interrupt(int irq, void *data) 587a125e092SBenjamin Herrenschmidt { 5885e4da530SAnton Blanchard __be64 events; 589a125e092SBenjamin Herrenschmidt 590a125e092SBenjamin Herrenschmidt opal_handle_interrupt(virq_to_hw(irq), &events); 591a125e092SBenjamin Herrenschmidt 59256b4c993SAnton Blanchard opal_do_notifier(be64_to_cpu(events)); 593a125e092SBenjamin Herrenschmidt 594a125e092SBenjamin Herrenschmidt return IRQ_HANDLED; 595a125e092SBenjamin Herrenschmidt } 596a125e092SBenjamin Herrenschmidt 5976f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5986f68b5e2SVasant Hegde { 5996f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 6006f68b5e2SVasant Hegde if (!opal_kobj) { 6016f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 6026f68b5e2SVasant Hegde return -ENOMEM; 6036f68b5e2SVasant Hegde } 6046f68b5e2SVasant Hegde 6056f68b5e2SVasant Hegde return 0; 6066f68b5e2SVasant Hegde } 6076f68b5e2SVasant Hegde 608b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 609b09c2ec4SVasant Hegde { 610b09c2ec4SVasant Hegde void *addr; 611b09c2ec4SVasant Hegde uint64_t size; 612b09c2ec4SVasant Hegde int rc; 613b09c2ec4SVasant Hegde 614b09c2ec4SVasant Hegde /* Register kernel log buffer */ 615b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 616b09c2ec4SVasant Hegde size = log_buf_len_get(); 617b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 618b09c2ec4SVasant Hegde __pa(addr), size); 619b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 620b09c2ec4SVasant Hegde * know about that call 621b09c2ec4SVasant Hegde */ 622b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 623b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 624b09c2ec4SVasant Hegde "rc = %d\n", rc); 625b09c2ec4SVasant Hegde } 62614a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 62714a43e69SBenjamin Herrenschmidt { 62814a43e69SBenjamin Herrenschmidt struct device_node *np, *consoles; 6291cc79bc8SAlistair Popple const __be32 *irqs; 630a125e092SBenjamin Herrenschmidt int rc, i, irqlen; 63114a43e69SBenjamin Herrenschmidt 63214a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 63314a43e69SBenjamin Herrenschmidt if (!opal_node) { 63414a43e69SBenjamin Herrenschmidt pr_warn("opal: Node not found\n"); 63514a43e69SBenjamin Herrenschmidt return -ENODEV; 63614a43e69SBenjamin Herrenschmidt } 6372db29d28SBenjamin Herrenschmidt 6382db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 63914a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 64014a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 64114a43e69SBenjamin Herrenschmidt else 64214a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 6432db29d28SBenjamin Herrenschmidt if (consoles) { 64414a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 64514a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 64614a43e69SBenjamin Herrenschmidt continue; 64714a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 64814a43e69SBenjamin Herrenschmidt } 64914a43e69SBenjamin Herrenschmidt of_node_put(consoles); 6502db29d28SBenjamin Herrenschmidt } 651a125e092SBenjamin Herrenschmidt 652a125e092SBenjamin Herrenschmidt /* Find all OPAL interrupts and request them */ 653a125e092SBenjamin Herrenschmidt irqs = of_get_property(opal_node, "opal-interrupts", &irqlen); 654a125e092SBenjamin Herrenschmidt pr_debug("opal: Found %d interrupts reserved for OPAL\n", 655a125e092SBenjamin Herrenschmidt irqs ? (irqlen / 4) : 0); 65673ed148aSBenjamin Herrenschmidt opal_irq_count = irqlen / 4; 65773ed148aSBenjamin Herrenschmidt opal_irqs = kzalloc(opal_irq_count * sizeof(unsigned int), GFP_KERNEL); 658a125e092SBenjamin Herrenschmidt for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) { 659a125e092SBenjamin Herrenschmidt unsigned int hwirq = be32_to_cpup(irqs); 660a125e092SBenjamin Herrenschmidt unsigned int irq = irq_create_mapping(NULL, hwirq); 661a125e092SBenjamin Herrenschmidt if (irq == NO_IRQ) { 662a125e092SBenjamin Herrenschmidt pr_warning("opal: Failed to map irq 0x%x\n", hwirq); 663a125e092SBenjamin Herrenschmidt continue; 664a125e092SBenjamin Herrenschmidt } 665a125e092SBenjamin Herrenschmidt rc = request_irq(irq, opal_interrupt, 0, "opal", NULL); 666a125e092SBenjamin Herrenschmidt if (rc) 667a125e092SBenjamin Herrenschmidt pr_warning("opal: Error %d requesting irq %d" 668a125e092SBenjamin Herrenschmidt " (0x%x)\n", rc, irq, hwirq); 66973ed148aSBenjamin Herrenschmidt opal_irqs[i] = irq; 670a125e092SBenjamin Herrenschmidt } 6716f68b5e2SVasant Hegde 6726f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 6736f68b5e2SVasant Hegde rc = opal_sysfs_init(); 67450bd6153SVasant Hegde if (rc == 0) { 675b09c2ec4SVasant Hegde /* Setup dump region interface */ 676b09c2ec4SVasant Hegde opal_dump_region_init(); 677774fea1aSStewart Smith /* Setup error log interface */ 678774fea1aSStewart Smith rc = opal_elog_init(); 67950bd6153SVasant Hegde /* Setup code update interface */ 68050bd6153SVasant Hegde opal_flash_init(); 681c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 682c7e64b9cSStewart Smith opal_platform_dump_init(); 6834029cd66SNeelesh Gupta /* Setup system parameters interface */ 6844029cd66SNeelesh Gupta opal_sys_param_init(); 685bfc36894SJoel Stanley /* Setup message log interface. */ 686bfc36894SJoel Stanley opal_msglog_init(); 68750bd6153SVasant Hegde } 6886f68b5e2SVasant Hegde 68914a43e69SBenjamin Herrenschmidt return 0; 69014a43e69SBenjamin Herrenschmidt } 691b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 69273ed148aSBenjamin Herrenschmidt 69373ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 69473ed148aSBenjamin Herrenschmidt { 69573ed148aSBenjamin Herrenschmidt unsigned int i; 696f7d98d18SVasant Hegde long rc = OPAL_BUSY; 69773ed148aSBenjamin Herrenschmidt 698f7d98d18SVasant Hegde /* First free interrupts, which will also mask them */ 69973ed148aSBenjamin Herrenschmidt for (i = 0; i < opal_irq_count; i++) { 70073ed148aSBenjamin Herrenschmidt if (opal_irqs[i]) 701b0d436c7SAnton Blanchard free_irq(opal_irqs[i], NULL); 70273ed148aSBenjamin Herrenschmidt opal_irqs[i] = 0; 70373ed148aSBenjamin Herrenschmidt } 704f7d98d18SVasant Hegde 705f7d98d18SVasant Hegde /* 706f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 707f7d98d18SVasant Hegde * potentially write to our memory has completed such 708f7d98d18SVasant Hegde * as an ongoing dump retrieval 709f7d98d18SVasant Hegde */ 710f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 711f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 712f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 713f7d98d18SVasant Hegde opal_poll_events(NULL); 714f7d98d18SVasant Hegde else 715f7d98d18SVasant Hegde mdelay(10); 716f7d98d18SVasant Hegde } 717b09c2ec4SVasant Hegde 718b09c2ec4SVasant Hegde /* Unregister memory dump region */ 719b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 72073ed148aSBenjamin Herrenschmidt } 721e28b05e7SJoel Stanley 722e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 723e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 7243441f04bSAnton Blanchard 7253441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 7263441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 7273441f04bSAnton Blanchard unsigned long vmalloc_size) 7283441f04bSAnton Blanchard { 7293441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 7303441f04bSAnton Blanchard unsigned long i = 0; 7313441f04bSAnton Blanchard 7323441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 7333441f04bSAnton Blanchard if (!sg) 7343441f04bSAnton Blanchard goto nomem; 7353441f04bSAnton Blanchard 7363441f04bSAnton Blanchard first = sg; 7373441f04bSAnton Blanchard 7383441f04bSAnton Blanchard while (vmalloc_size > 0) { 7393441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 7403441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 7413441f04bSAnton Blanchard 7423441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 7433441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 7443441f04bSAnton Blanchard i++; 7453441f04bSAnton Blanchard 7463441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 7473441f04bSAnton Blanchard struct opal_sg_list *next; 7483441f04bSAnton Blanchard 7493441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 7503441f04bSAnton Blanchard if (!next) 7513441f04bSAnton Blanchard goto nomem; 7523441f04bSAnton Blanchard 7533441f04bSAnton Blanchard sg->length = cpu_to_be64( 7543441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 7553441f04bSAnton Blanchard i = 0; 7563441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 7573441f04bSAnton Blanchard sg = next; 7583441f04bSAnton Blanchard } 7593441f04bSAnton Blanchard 7603441f04bSAnton Blanchard vmalloc_addr += length; 7613441f04bSAnton Blanchard vmalloc_size -= length; 7623441f04bSAnton Blanchard } 7633441f04bSAnton Blanchard 7643441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 7653441f04bSAnton Blanchard 7663441f04bSAnton Blanchard return first; 7673441f04bSAnton Blanchard 7683441f04bSAnton Blanchard nomem: 7693441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 7703441f04bSAnton Blanchard opal_free_sg_list(first); 7713441f04bSAnton Blanchard return NULL; 7723441f04bSAnton Blanchard } 7733441f04bSAnton Blanchard 7743441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 7753441f04bSAnton Blanchard { 7763441f04bSAnton Blanchard while (sg) { 7773441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 7783441f04bSAnton Blanchard 7793441f04bSAnton Blanchard kfree(sg); 7803441f04bSAnton Blanchard 7813441f04bSAnton Blanchard if (next) 7823441f04bSAnton Blanchard sg = __va(next); 7833441f04bSAnton Blanchard else 7843441f04bSAnton Blanchard sg = NULL; 7853441f04bSAnton Blanchard } 7863441f04bSAnton Blanchard } 787