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> 198f95faaaSMadhavan Srinivasan #include <linux/of_address.h> 20a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 211bc98de2SGavin Shan #include <linux/notifier.h> 2273ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 23b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 246f68b5e2SVasant Hegde #include <linux/kobject.h> 25f7d98d18SVasant Hegde #include <linux/delay.h> 2655672ecfSMahesh Salgaonkar #include <linux/memblock.h> 273bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 283bf57561SBenjamin Herrenschmidt #include <linux/freezer.h> 29b746e3e0SNicholas Piggin #include <linux/printk.h> 30b746e3e0SNicholas Piggin #include <linux/kmsg_dump.h> 31b746e3e0SNicholas Piggin #include <linux/console.h> 32b746e3e0SNicholas Piggin #include <linux/sched/debug.h> 33b14726c5SMichael Ellerman 34b14726c5SMichael Ellerman #include <asm/machdep.h> 3514a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 3614a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3736df96f8SMahesh Salgaonkar #include <asm/mce.h> 388f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 3914a43e69SBenjamin Herrenschmidt 4014a43e69SBenjamin Herrenschmidt #include "powernv.h" 4114a43e69SBenjamin Herrenschmidt 426f68b5e2SVasant Hegde /* /sys/firmware/opal */ 436f68b5e2SVasant Hegde struct kobject *opal_kobj; 446f68b5e2SVasant Hegde 4514a43e69SBenjamin Herrenschmidt struct opal { 4614a43e69SBenjamin Herrenschmidt u64 base; 4714a43e69SBenjamin Herrenschmidt u64 entry; 4855672ecfSMahesh Salgaonkar u64 size; 4914a43e69SBenjamin Herrenschmidt } opal; 5014a43e69SBenjamin Herrenschmidt 5155672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 5255672ecfSMahesh Salgaonkar u64 start_addr; 5355672ecfSMahesh Salgaonkar u64 end_addr; 5455672ecfSMahesh Salgaonkar u64 recover_addr; 5555672ecfSMahesh Salgaonkar }; 5655672ecfSMahesh Salgaonkar 5755672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5855672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5955672ecfSMahesh Salgaonkar 60bfc36894SJoel Stanley struct device_node *opal_node; 6114a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 6224366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 633bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 64a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 6514a43e69SBenjamin Herrenschmidt 66d3cbff1bSBenjamin Herrenschmidt void opal_configure_cores(void) 674926616cSBenjamin Herrenschmidt { 681c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 691c0eaf0fSBenjamin Herrenschmidt 704926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 714926616cSBenjamin Herrenschmidt * 724926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 734926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 744926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 754926616cSBenjamin Herrenschmidt */ 764926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 771c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 784926616cSBenjamin Herrenschmidt #else 791c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 804926616cSBenjamin Herrenschmidt #endif 81d3cbff1bSBenjamin Herrenschmidt 821c0eaf0fSBenjamin Herrenschmidt /* 831c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 841c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 851c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 861c0eaf0fSBenjamin Herrenschmidt */ 87a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 881c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 891c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 901c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 911c0eaf0fSBenjamin Herrenschmidt } 921c0eaf0fSBenjamin Herrenschmidt 931c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 941c0eaf0fSBenjamin Herrenschmidt 95d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 96d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 97d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 984926616cSBenjamin Herrenschmidt } 994926616cSBenjamin Herrenschmidt 10014a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 10114a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 10214a43e69SBenjamin Herrenschmidt { 10355672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 1049d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 10514a43e69SBenjamin Herrenschmidt 10614a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10714a43e69SBenjamin Herrenschmidt return 0; 10814a43e69SBenjamin Herrenschmidt 10914a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 11014a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 11155672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 11214a43e69SBenjamin Herrenschmidt 11355672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 11414a43e69SBenjamin Herrenschmidt return 1; 11514a43e69SBenjamin Herrenschmidt 11614a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 11714a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 11855672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 11914a43e69SBenjamin Herrenschmidt 1209d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 12114a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1229d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 12314a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1249d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 12555672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 12614a43e69SBenjamin Herrenschmidt 12775b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 128e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 129e4d54f71SStewart Smith pr_info("OPAL detected !\n"); 13014a43e69SBenjamin Herrenschmidt } else { 131786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 13214a43e69SBenjamin Herrenschmidt } 13314a43e69SBenjamin Herrenschmidt 134c4463b37SJeremy Kerr return 1; 135c4463b37SJeremy Kerr } 136c4463b37SJeremy Kerr 13755672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13855672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 13955672ecfSMahesh Salgaonkar { 1409d0c4dfeSRob Herring int i, psize, size; 14155672ecfSMahesh Salgaonkar const __be32 *prop; 14255672ecfSMahesh Salgaonkar 14355672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 14455672ecfSMahesh Salgaonkar return 0; 14555672ecfSMahesh Salgaonkar 1466e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 14755672ecfSMahesh Salgaonkar 14855672ecfSMahesh Salgaonkar if (!prop) 14955672ecfSMahesh Salgaonkar return 1; 15055672ecfSMahesh Salgaonkar 15155672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 15255672ecfSMahesh Salgaonkar 15355672ecfSMahesh Salgaonkar /* 1546e556b47SMahesh Salgaonkar * Calculate number of available entries. 1556e556b47SMahesh Salgaonkar * 1566e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1576e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1586e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1596e556b47SMahesh Salgaonkar */ 1606e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1616e556b47SMahesh Salgaonkar 1626e556b47SMahesh Salgaonkar /* Sanity check */ 1636e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1646e556b47SMahesh Salgaonkar return 1; 1656e556b47SMahesh Salgaonkar 1666e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1676e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1686e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1696e556b47SMahesh Salgaonkar 1706e556b47SMahesh Salgaonkar /* 17176b42e28SNicholas Piggin * Allocate a buffer to hold the MC recoverable ranges. 17255672ecfSMahesh Salgaonkar */ 17376b42e28SNicholas Piggin mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64))); 17455672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 17555672ecfSMahesh Salgaonkar 1766e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17755672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17855672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 17955672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 18055672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 18155672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 18255672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 18355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 18455672ecfSMahesh Salgaonkar 18555672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18655672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18755672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18855672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 18955672ecfSMahesh Salgaonkar } 19055672ecfSMahesh Salgaonkar return 1; 19155672ecfSMahesh Salgaonkar } 19255672ecfSMahesh Salgaonkar 193c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 194c4463b37SJeremy Kerr { 19529186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 196c4463b37SJeremy Kerr u64 glue; 197c4463b37SJeremy Kerr 198c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 199c4463b37SJeremy Kerr return -ENODEV; 200c4463b37SJeremy Kerr 20128446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 20228446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 203ed79ba9eSBenjamin Herrenschmidt */ 204ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2056507955cSMahesh Salgaonkar 2066507955cSMahesh Salgaonkar /* 2076507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2086507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2096507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2106507955cSMahesh Salgaonkar * 2116507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2126507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2136507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2146507955cSMahesh Salgaonkar * 2156507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2166507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2176507955cSMahesh Salgaonkar */ 2186507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 21908135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2206507955cSMahesh Salgaonkar opal_register_exception_handler( 2216507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2226507955cSMahesh Salgaonkar 0, glue); 2236507955cSMahesh Salgaonkar glue += 128; 2246507955cSMahesh Salgaonkar } 2256507955cSMahesh Salgaonkar 226ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 22729186097SBenjamin Herrenschmidt #endif 228ed79ba9eSBenjamin Herrenschmidt 229c4463b37SJeremy Kerr return 0; 23014a43e69SBenjamin Herrenschmidt } 231b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 232c4463b37SJeremy Kerr 23324366360SMahesh Salgaonkar /* 23424366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 23524366360SMahesh Salgaonkar * notified for specific messgae type. 23624366360SMahesh Salgaonkar */ 237d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 23824366360SMahesh Salgaonkar struct notifier_block *nb) 23924366360SMahesh Salgaonkar { 240792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 241792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 24224366360SMahesh Salgaonkar __func__, msg_type); 24324366360SMahesh Salgaonkar return -EINVAL; 24424366360SMahesh Salgaonkar } 245792f96e9SNeelesh Gupta 24624366360SMahesh Salgaonkar return atomic_notifier_chain_register( 24724366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 24824366360SMahesh Salgaonkar } 249594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 25024366360SMahesh Salgaonkar 251df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 252b921e902SNeelesh Gupta struct notifier_block *nb) 253b921e902SNeelesh Gupta { 254b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 255b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 256b921e902SNeelesh Gupta } 257594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 258b921e902SNeelesh Gupta 25924366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 26024366360SMahesh Salgaonkar { 26124366360SMahesh Salgaonkar /* notify subscribers */ 26224366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 26324366360SMahesh Salgaonkar msg_type, msg); 26424366360SMahesh Salgaonkar } 26524366360SMahesh Salgaonkar 26624366360SMahesh Salgaonkar static void opal_handle_message(void) 26724366360SMahesh Salgaonkar { 26824366360SMahesh Salgaonkar s64 ret; 26924366360SMahesh Salgaonkar /* 27024366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 27124366360SMahesh Salgaonkar * value in /proc/device-tree. 27224366360SMahesh Salgaonkar */ 27324366360SMahesh Salgaonkar static struct opal_msg msg; 274bb4398e1SAnton Blanchard u32 type; 27524366360SMahesh Salgaonkar 27624366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 27724366360SMahesh Salgaonkar /* No opal message pending. */ 27824366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 27924366360SMahesh Salgaonkar return; 28024366360SMahesh Salgaonkar 28124366360SMahesh Salgaonkar /* check for errors. */ 28224366360SMahesh Salgaonkar if (ret) { 2831a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 28424366360SMahesh Salgaonkar __func__, ret); 28524366360SMahesh Salgaonkar return; 28624366360SMahesh Salgaonkar } 28724366360SMahesh Salgaonkar 288bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 289bb4398e1SAnton Blanchard 29024366360SMahesh Salgaonkar /* Sanity check */ 291792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 29298da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 29324366360SMahesh Salgaonkar return; 29424366360SMahesh Salgaonkar } 295bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 29624366360SMahesh Salgaonkar } 29724366360SMahesh Salgaonkar 298a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 29924366360SMahesh Salgaonkar { 30024366360SMahesh Salgaonkar opal_handle_message(); 301a295af24SAlistair Popple return IRQ_HANDLED; 30224366360SMahesh Salgaonkar } 30324366360SMahesh Salgaonkar 30424366360SMahesh Salgaonkar static int __init opal_message_init(void) 30524366360SMahesh Salgaonkar { 306a295af24SAlistair Popple int ret, i, irq; 30724366360SMahesh Salgaonkar 30824366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 30924366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 31024366360SMahesh Salgaonkar 311a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 312a295af24SAlistair Popple if (!irq) { 313a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 314a295af24SAlistair Popple __func__, irq); 315a295af24SAlistair Popple return irq; 316a295af24SAlistair Popple } 317a295af24SAlistair Popple 318a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 319a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 32024366360SMahesh Salgaonkar if (ret) { 321a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 32224366360SMahesh Salgaonkar __func__, ret); 32324366360SMahesh Salgaonkar return ret; 32424366360SMahesh Salgaonkar } 325a295af24SAlistair Popple 32624366360SMahesh Salgaonkar return 0; 32724366360SMahesh Salgaonkar } 32824366360SMahesh Salgaonkar 32914a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 33014a43e69SBenjamin Herrenschmidt { 3314f89363bSBenjamin Herrenschmidt s64 rc; 3324f89363bSBenjamin Herrenschmidt __be64 evt, len; 33314a43e69SBenjamin Herrenschmidt 33414a43e69SBenjamin Herrenschmidt if (!opal.entry) 335daea1175SBenjamin Herrenschmidt return -ENODEV; 33614a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3374f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 33814a43e69SBenjamin Herrenschmidt return 0; 3394f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 34014a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 34114a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3424f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 34314a43e69SBenjamin Herrenschmidt return 0; 34414a43e69SBenjamin Herrenschmidt } 34514a43e69SBenjamin Herrenschmidt 34614a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 34714a43e69SBenjamin Herrenschmidt { 34814a43e69SBenjamin Herrenschmidt int written = 0; 3494f89363bSBenjamin Herrenschmidt __be64 olen; 350daea1175SBenjamin Herrenschmidt s64 len, rc; 35114a43e69SBenjamin Herrenschmidt unsigned long flags; 3524f89363bSBenjamin Herrenschmidt __be64 evt; 35314a43e69SBenjamin Herrenschmidt 35414a43e69SBenjamin Herrenschmidt if (!opal.entry) 355daea1175SBenjamin Herrenschmidt return -ENODEV; 35614a43e69SBenjamin Herrenschmidt 35714a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 35814a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 359daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 360daea1175SBenjamin Herrenschmidt * 361daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 362daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 363daea1175SBenjamin Herrenschmidt * enough room and be done with it 36414a43e69SBenjamin Herrenschmidt */ 36514a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3664f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3674f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 36814a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 36914a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 37014a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 37114a43e69SBenjamin Herrenschmidt if (rc) 37214a43e69SBenjamin Herrenschmidt return total_len; 3734f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 37414a43e69SBenjamin Herrenschmidt return -EAGAIN; 37514a43e69SBenjamin Herrenschmidt } 37614a43e69SBenjamin Herrenschmidt 37714a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 37814a43e69SBenjamin Herrenschmidt * should no longer happen. 37914a43e69SBenjamin Herrenschmidt */ 380daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 38114a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 38214a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3834f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3844f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3854f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3861de1455fSBenjamin Herrenschmidt 3871de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3881de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3891de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3901de1455fSBenjamin Herrenschmidt written = total_len; 3911de1455fSBenjamin Herrenschmidt break; 3921de1455fSBenjamin Herrenschmidt } 39314a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 39414a43e69SBenjamin Herrenschmidt total_len -= len; 39514a43e69SBenjamin Herrenschmidt data += len; 39614a43e69SBenjamin Herrenschmidt written += len; 39714a43e69SBenjamin Herrenschmidt } 39814a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 39914a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 40014a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 40114a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 40214a43e69SBenjamin Herrenschmidt */ 40314a43e69SBenjamin Herrenschmidt do 40414a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4054f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4064f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 40714a43e69SBenjamin Herrenschmidt } 40814a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 40914a43e69SBenjamin Herrenschmidt return written; 41014a43e69SBenjamin Herrenschmidt } 41114a43e69SBenjamin Herrenschmidt 412b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 413b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 414b63a0ffeSMahesh Salgaonkar { 415b63a0ffeSMahesh Salgaonkar int recovered = 0; 416b63a0ffeSMahesh Salgaonkar 417b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 418b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 419c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 420b63a0ffeSMahesh Salgaonkar recovered = 0; 421b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 422b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 423b63a0ffeSMahesh Salgaonkar recovered = 1; 4241363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 4251363875bSNicholas Piggin /* Fatal machine check */ 4261363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 4271363875bSNicholas Piggin recovered = 0; 4281363875bSNicholas Piggin } else if ((evt->severity == MCE_SEV_ERROR_SYNC) && 4291363875bSNicholas Piggin (user_mode(regs) && !is_global_init(current))) { 430b63a0ffeSMahesh Salgaonkar /* 431b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 432b63a0ffeSMahesh Salgaonkar * in userspace. 433b63a0ffeSMahesh Salgaonkar * 434b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 435b63a0ffeSMahesh Salgaonkar */ 436b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 437b63a0ffeSMahesh Salgaonkar recovered = 1; 438b63a0ffeSMahesh Salgaonkar } 439b63a0ffeSMahesh Salgaonkar return recovered; 440b63a0ffeSMahesh Salgaonkar } 441b63a0ffeSMahesh Salgaonkar 442b746e3e0SNicholas Piggin void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 443b746e3e0SNicholas Piggin { 444b746e3e0SNicholas Piggin /* 445b746e3e0SNicholas Piggin * This is mostly taken from kernel/panic.c, but tries to do 446b746e3e0SNicholas Piggin * relatively minimal work. Don't use delay functions (TB may 447b746e3e0SNicholas Piggin * be broken), don't crash dump (need to set a firmware log), 448b746e3e0SNicholas Piggin * don't run notifiers. We do want to get some information to 449b746e3e0SNicholas Piggin * Linux console. 450b746e3e0SNicholas Piggin */ 451b746e3e0SNicholas Piggin console_verbose(); 452b746e3e0SNicholas Piggin bust_spinlocks(1); 453b746e3e0SNicholas Piggin pr_emerg("Hardware platform error: %s\n", msg); 454b746e3e0SNicholas Piggin if (regs) 455b746e3e0SNicholas Piggin show_regs(regs); 456b746e3e0SNicholas Piggin smp_send_stop(); 457b746e3e0SNicholas Piggin printk_safe_flush_on_panic(); 458b746e3e0SNicholas Piggin kmsg_dump(KMSG_DUMP_PANIC); 459b746e3e0SNicholas Piggin bust_spinlocks(0); 460b746e3e0SNicholas Piggin debug_locks_off(); 461b746e3e0SNicholas Piggin console_flush_on_panic(); 462b746e3e0SNicholas Piggin 463b746e3e0SNicholas Piggin /* 464b746e3e0SNicholas Piggin * Don't bother to shut things down because this will 465b746e3e0SNicholas Piggin * xstop the system. 466b746e3e0SNicholas Piggin */ 467b746e3e0SNicholas Piggin if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 468b746e3e0SNicholas Piggin == OPAL_UNSUPPORTED) { 469b746e3e0SNicholas Piggin pr_emerg("Reboot type %d not supported for %s\n", 470b746e3e0SNicholas Piggin OPAL_REBOOT_PLATFORM_ERROR, msg); 471b746e3e0SNicholas Piggin } 472b746e3e0SNicholas Piggin 473b746e3e0SNicholas Piggin /* 474b746e3e0SNicholas Piggin * We reached here. There can be three possibilities: 475b746e3e0SNicholas Piggin * 1. We are running on a firmware level that do not support 476b746e3e0SNicholas Piggin * opal_cec_reboot2() 477b746e3e0SNicholas Piggin * 2. We are running on a firmware level that do not support 478b746e3e0SNicholas Piggin * OPAL_REBOOT_PLATFORM_ERROR reboot type. 479b746e3e0SNicholas Piggin * 3. We are running on FSP based system that does not need 480b746e3e0SNicholas Piggin * opal to trigger checkstop explicitly for error analysis. 481b746e3e0SNicholas Piggin * The FSP PRD component would have already got notified 482b746e3e0SNicholas Piggin * about this error through other channels. 483b746e3e0SNicholas Piggin */ 484b746e3e0SNicholas Piggin 485b746e3e0SNicholas Piggin ppc_md.restart(NULL); 486b746e3e0SNicholas Piggin } 487b746e3e0SNicholas Piggin 488ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 489ed79ba9eSBenjamin Herrenschmidt { 49036df96f8SMahesh Salgaonkar struct machine_check_event evt; 491ed79ba9eSBenjamin Herrenschmidt 49236df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 49336df96f8SMahesh Salgaonkar return 0; 494ed79ba9eSBenjamin Herrenschmidt 495ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 49636df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 497ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 498ed79ba9eSBenjamin Herrenschmidt evt.version); 499ed79ba9eSBenjamin Herrenschmidt return 0; 500ed79ba9eSBenjamin Herrenschmidt } 50163f44d65SMichael Ellerman machine_check_print_event_info(&evt, user_mode(regs)); 502ed79ba9eSBenjamin Herrenschmidt 503b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 504b63a0ffeSMahesh Salgaonkar return 1; 505e784b649SMahesh Salgaonkar 506b746e3e0SNicholas Piggin pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 507ed79ba9eSBenjamin Herrenschmidt } 508ed79ba9eSBenjamin Herrenschmidt 5090869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 5100869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 5110869b6fdSMahesh Salgaonkar { 5120ef95b41SMahesh Salgaonkar s64 rc; 5130ef95b41SMahesh Salgaonkar 5140ef95b41SMahesh Salgaonkar /* 5150ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5160ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5170ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5180ef95b41SMahesh Salgaonkar */ 5190ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5200ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5210ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5220ef95b41SMahesh Salgaonkar return 1; 5230ef95b41SMahesh Salgaonkar } 5240869b6fdSMahesh Salgaonkar return 0; 5250869b6fdSMahesh Salgaonkar } 5260869b6fdSMahesh Salgaonkar 5270869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5280869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5290869b6fdSMahesh Salgaonkar { 5300ef95b41SMahesh Salgaonkar s64 rc; 5310ef95b41SMahesh Salgaonkar __be64 evt = 0; 5320ef95b41SMahesh Salgaonkar 5330ef95b41SMahesh Salgaonkar /* 5340ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5350ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5360ef95b41SMahesh Salgaonkar * process them. 5370ef95b41SMahesh Salgaonkar */ 5380ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5390869b6fdSMahesh Salgaonkar return 0; 5400ef95b41SMahesh Salgaonkar 5410ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5420ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 54381f2f7ceSAlistair Popple if (rc == OPAL_SUCCESS && evt) 5449f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(evt)); 5450ef95b41SMahesh Salgaonkar 5460ef95b41SMahesh Salgaonkar return 1; 5470869b6fdSMahesh Salgaonkar } 5480869b6fdSMahesh Salgaonkar 54955672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 55055672ecfSMahesh Salgaonkar { 55155672ecfSMahesh Salgaonkar int i; 55255672ecfSMahesh Salgaonkar 55355672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 55455672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 55555672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 55655672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 55755672ecfSMahesh Salgaonkar return 0; 55855672ecfSMahesh Salgaonkar } 55955672ecfSMahesh Salgaonkar 56055672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 56155672ecfSMahesh Salgaonkar { 56255672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 56355672ecfSMahesh Salgaonkar 56455672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 56555672ecfSMahesh Salgaonkar goto out; 56655672ecfSMahesh Salgaonkar 56755672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 568dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 56955672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 57055672ecfSMahesh Salgaonkar 57155672ecfSMahesh Salgaonkar /* 57255672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 57355672ecfSMahesh Salgaonkar */ 57455672ecfSMahesh Salgaonkar if (recover_addr) 57555672ecfSMahesh Salgaonkar regs->nip = recover_addr; 57655672ecfSMahesh Salgaonkar 57755672ecfSMahesh Salgaonkar out: 57855672ecfSMahesh Salgaonkar return !!recover_addr; 57955672ecfSMahesh Salgaonkar } 58055672ecfSMahesh Salgaonkar 5816f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5826f68b5e2SVasant Hegde { 5836f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5846f68b5e2SVasant Hegde if (!opal_kobj) { 5856f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5866f68b5e2SVasant Hegde return -ENOMEM; 5876f68b5e2SVasant Hegde } 5886f68b5e2SVasant Hegde 5896f68b5e2SVasant Hegde return 0; 5906f68b5e2SVasant Hegde } 5916f68b5e2SVasant Hegde 592c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 593c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 594c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 595c8742f85SBenjamin Herrenschmidt { 596c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 597c8742f85SBenjamin Herrenschmidt bin_attr->size); 598c8742f85SBenjamin Herrenschmidt } 599c8742f85SBenjamin Herrenschmidt 600c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 601c8742f85SBenjamin Herrenschmidt 602c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 603c8742f85SBenjamin Herrenschmidt { 604c8742f85SBenjamin Herrenschmidt const __be64 *syms; 605c8742f85SBenjamin Herrenschmidt unsigned int size; 606c8742f85SBenjamin Herrenschmidt struct device_node *fw; 607c8742f85SBenjamin Herrenschmidt int rc; 608c8742f85SBenjamin Herrenschmidt 609c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 610c8742f85SBenjamin Herrenschmidt if (!fw) 611c8742f85SBenjamin Herrenschmidt return; 612c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 613c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 614c8742f85SBenjamin Herrenschmidt return; 615c8742f85SBenjamin Herrenschmidt 616c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 617c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 618c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 619c8742f85SBenjamin Herrenschmidt 620c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 621c8742f85SBenjamin Herrenschmidt if (rc) 622c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 623c8742f85SBenjamin Herrenschmidt } 624c8742f85SBenjamin Herrenschmidt 62511fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 62611fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 62711fe909dSMatt Brown loff_t off, size_t count) 62811fe909dSMatt Brown { 62911fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 63011fe909dSMatt Brown bin_attr->size); 63111fe909dSMatt Brown } 63211fe909dSMatt Brown 63311fe909dSMatt Brown /* 63411fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 63511fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 63611fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 63711fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 63811fe909dSMatt Brown * The new sysfs nodes are only readable by root. 63911fe909dSMatt Brown */ 64011fe909dSMatt Brown static void opal_export_attrs(void) 64111fe909dSMatt Brown { 64211fe909dSMatt Brown struct bin_attribute *attr; 64311fe909dSMatt Brown struct device_node *np; 64411fe909dSMatt Brown struct property *prop; 64511fe909dSMatt Brown struct kobject *kobj; 64611fe909dSMatt Brown u64 vals[2]; 64711fe909dSMatt Brown int rc; 64811fe909dSMatt Brown 64911fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 65011fe909dSMatt Brown if (!np) 65111fe909dSMatt Brown return; 65211fe909dSMatt Brown 65311fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 65411fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 65511fe909dSMatt Brown if (!kobj) { 65611fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 65711fe909dSMatt Brown return; 65811fe909dSMatt Brown } 65911fe909dSMatt Brown 66011fe909dSMatt Brown for_each_property_of_node(np, prop) { 66111fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 66211fe909dSMatt Brown continue; 66311fe909dSMatt Brown 66411fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 66511fe909dSMatt Brown continue; 66611fe909dSMatt Brown 66783c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 66811fe909dSMatt Brown 66911fe909dSMatt Brown if (attr == NULL) { 67011fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 67111fe909dSMatt Brown continue; 67211fe909dSMatt Brown } 67311fe909dSMatt Brown 67483c49190SMichael Ellerman sysfs_bin_attr_init(attr); 67511fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 67611fe909dSMatt Brown attr->attr.mode = 0400; 67711fe909dSMatt Brown attr->read = export_attr_read; 67811fe909dSMatt Brown attr->private = __va(vals[0]); 67911fe909dSMatt Brown attr->size = vals[1]; 68011fe909dSMatt Brown 68111fe909dSMatt Brown if (attr->attr.name == NULL) { 68211fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 68311fe909dSMatt Brown kfree(attr); 68411fe909dSMatt Brown continue; 68511fe909dSMatt Brown } 68611fe909dSMatt Brown 68711fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 68811fe909dSMatt Brown if (rc) { 68911fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 69011fe909dSMatt Brown rc, prop->name); 69111fe909dSMatt Brown kfree(attr->attr.name); 69211fe909dSMatt Brown kfree(attr); 69311fe909dSMatt Brown } 69411fe909dSMatt Brown } 69511fe909dSMatt Brown 69611fe909dSMatt Brown of_node_put(np); 69711fe909dSMatt Brown } 69811fe909dSMatt Brown 699b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 700b09c2ec4SVasant Hegde { 701b09c2ec4SVasant Hegde void *addr; 702b09c2ec4SVasant Hegde uint64_t size; 703b09c2ec4SVasant Hegde int rc; 704b09c2ec4SVasant Hegde 705b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 706b962f5a4SStewart Smith return; 707b962f5a4SStewart Smith 708b09c2ec4SVasant Hegde /* Register kernel log buffer */ 709b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 7106501ab5eSPranith Kumar if (addr == NULL) 7116501ab5eSPranith Kumar return; 7126501ab5eSPranith Kumar 713b09c2ec4SVasant Hegde size = log_buf_len_get(); 7146501ab5eSPranith Kumar if (size == 0) 7156501ab5eSPranith Kumar return; 7166501ab5eSPranith Kumar 717b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 718b09c2ec4SVasant Hegde __pa(addr), size); 719b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 720b09c2ec4SVasant Hegde * know about that call 721b09c2ec4SVasant Hegde */ 722b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 723b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 724b09c2ec4SVasant Hegde "rc = %d\n", rc); 725b09c2ec4SVasant Hegde } 726608b286dSJeremy Kerr 7279e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 728ed59190eSCyril Bur { 729ed59190eSCyril Bur struct device_node *np; 730ed59190eSCyril Bur 7319e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 73247083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 73347083450SNeelesh Gupta } 73447083450SNeelesh Gupta 7358f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 7368f95faaaSMadhavan Srinivasan { 7378f95faaaSMadhavan Srinivasan struct device_node *np; 7388f95faaaSMadhavan Srinivasan 7398f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 7408f95faaaSMadhavan Srinivasan if (np) 7418f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 7428f95faaaSMadhavan Srinivasan } 7438f95faaaSMadhavan Srinivasan 7443bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 7453bf57561SBenjamin Herrenschmidt { 746a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 7479f0fd049SAlistair Popple __be64 events; 7489f0fd049SAlistair Popple 7493bf57561SBenjamin Herrenschmidt set_freezable(); 7503bf57561SBenjamin Herrenschmidt do { 7513bf57561SBenjamin Herrenschmidt try_to_freeze(); 7529f0fd049SAlistair Popple opal_poll_events(&events); 7539f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(events)); 754a203658bSBenjamin Herrenschmidt schedule_timeout_interruptible(timeout); 7553bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 7563bf57561SBenjamin Herrenschmidt 7573bf57561SBenjamin Herrenschmidt return 0; 7583bf57561SBenjamin Herrenschmidt } 7593bf57561SBenjamin Herrenschmidt 760a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 761a203658bSBenjamin Herrenschmidt { 762a203658bSBenjamin Herrenschmidt if (kopald_tsk) 763a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 764a203658bSBenjamin Herrenschmidt } 765a203658bSBenjamin Herrenschmidt 7663bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 7673bf57561SBenjamin Herrenschmidt { 7683bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 7693bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 7703bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 7713bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 7723bf57561SBenjamin Herrenschmidt 7733bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 774a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 7753bf57561SBenjamin Herrenschmidt } 7763bf57561SBenjamin Herrenschmidt 77714a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 77814a43e69SBenjamin Herrenschmidt { 779c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 780c1c3a526SGavin Shan int rc; 78114a43e69SBenjamin Herrenschmidt 78214a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 78314a43e69SBenjamin Herrenschmidt if (!opal_node) { 78408135139SMichael Ellerman pr_warn("Device node not found\n"); 78514a43e69SBenjamin Herrenschmidt return -ENODEV; 78614a43e69SBenjamin Herrenschmidt } 7872db29d28SBenjamin Herrenschmidt 7882db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 78914a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 7902db29d28SBenjamin Herrenschmidt if (consoles) { 79114a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 79214a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 79314a43e69SBenjamin Herrenschmidt continue; 79414a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 79514a43e69SBenjamin Herrenschmidt } 79614a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7972db29d28SBenjamin Herrenschmidt } 798a125e092SBenjamin Herrenschmidt 79996e023e7SAlistair Popple /* Initialise OPAL messaging system */ 80096e023e7SAlistair Popple opal_message_init(); 80196e023e7SAlistair Popple 80296e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 80396e023e7SAlistair Popple opal_async_comp_init(); 80496e023e7SAlistair Popple 80596e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 80696e023e7SAlistair Popple opal_sensor_init(); 80796e023e7SAlistair Popple 80896e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 80996e023e7SAlistair Popple opal_hmi_handler_init(); 81096e023e7SAlistair Popple 81147083450SNeelesh Gupta /* Create i2c platform devices */ 8129e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 81347083450SNeelesh Gupta 8143bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 8153bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 8163bf57561SBenjamin Herrenschmidt 8178f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 8188f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 8198f95faaaSMadhavan Srinivasan 820c159b596SVasant Hegde /* Create leds platform devices */ 821c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 822c159b596SVasant Hegde if (leds) { 823c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 824c159b596SVasant Hegde of_node_put(leds); 825c159b596SVasant Hegde } 826c159b596SVasant Hegde 8279b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 8289b4fffa1SAndrew Donnellan opal_msglog_init(); 8299b4fffa1SAndrew Donnellan 8306f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 8316f68b5e2SVasant Hegde rc = opal_sysfs_init(); 83250bd6153SVasant Hegde if (rc == 0) { 833c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 834c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 835b09c2ec4SVasant Hegde /* Setup dump region interface */ 836b09c2ec4SVasant Hegde opal_dump_region_init(); 837774fea1aSStewart Smith /* Setup error log interface */ 838774fea1aSStewart Smith rc = opal_elog_init(); 83950bd6153SVasant Hegde /* Setup code update interface */ 840ed59190eSCyril Bur opal_flash_update_init(); 841c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 842c7e64b9cSStewart Smith opal_platform_dump_init(); 8434029cd66SNeelesh Gupta /* Setup system parameters interface */ 8444029cd66SNeelesh Gupta opal_sys_param_init(); 8459b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 8469b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 84750bd6153SVasant Hegde } 8486f68b5e2SVasant Hegde 84911fe909dSMatt Brown /* Export all properties */ 85011fe909dSMatt Brown opal_export_attrs(); 85111fe909dSMatt Brown 8520d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 8539e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 8549e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 8559e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 856ed59190eSCyril Bur 85743a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 8589e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 85943a1dd9bSSuraj Jitindar Singh 860affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 861affddff6SRussell Currey opal_kmsg_init(); 862affddff6SRussell Currey 863cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 864cb8b340dSShilpasri G Bhat opal_powercap_init(); 865cb8b340dSShilpasri G Bhat 8668e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 8678e84b2d1SShilpasri G Bhat opal_psr_init(); 8688e84b2d1SShilpasri G Bhat 869bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 870bf957155SShilpasri G Bhat opal_sensor_groups_init(); 871bf957155SShilpasri G Bhat 87214a43e69SBenjamin Herrenschmidt return 0; 87314a43e69SBenjamin Herrenschmidt } 874b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 87573ed148aSBenjamin Herrenschmidt 87673ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 87773ed148aSBenjamin Herrenschmidt { 878f7d98d18SVasant Hegde long rc = OPAL_BUSY; 87973ed148aSBenjamin Herrenschmidt 8809f0fd049SAlistair Popple opal_event_shutdown(); 881f7d98d18SVasant Hegde 882f7d98d18SVasant Hegde /* 883f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 884f7d98d18SVasant Hegde * potentially write to our memory has completed such 885f7d98d18SVasant Hegde * as an ongoing dump retrieval 886f7d98d18SVasant Hegde */ 887f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 888f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 889f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 890f7d98d18SVasant Hegde opal_poll_events(NULL); 891f7d98d18SVasant Hegde else 892f7d98d18SVasant Hegde mdelay(10); 893f7d98d18SVasant Hegde } 894b09c2ec4SVasant Hegde 895b09c2ec4SVasant Hegde /* Unregister memory dump region */ 896b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 897b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 89873ed148aSBenjamin Herrenschmidt } 899e28b05e7SJoel Stanley 900e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 901e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 902594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 903594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 904608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 905608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 906ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 907ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 908ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 9090d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 9103441f04bSAnton Blanchard 9113441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 9123441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 9133441f04bSAnton Blanchard unsigned long vmalloc_size) 9143441f04bSAnton Blanchard { 9153441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 9163441f04bSAnton Blanchard unsigned long i = 0; 9173441f04bSAnton Blanchard 9183441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 9193441f04bSAnton Blanchard if (!sg) 9203441f04bSAnton Blanchard goto nomem; 9213441f04bSAnton Blanchard 9223441f04bSAnton Blanchard first = sg; 9233441f04bSAnton Blanchard 9243441f04bSAnton Blanchard while (vmalloc_size > 0) { 9253441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 9263441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 9273441f04bSAnton Blanchard 9283441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 9293441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 9303441f04bSAnton Blanchard i++; 9313441f04bSAnton Blanchard 9323441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 9333441f04bSAnton Blanchard struct opal_sg_list *next; 9343441f04bSAnton Blanchard 9353441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 9363441f04bSAnton Blanchard if (!next) 9373441f04bSAnton Blanchard goto nomem; 9383441f04bSAnton Blanchard 9393441f04bSAnton Blanchard sg->length = cpu_to_be64( 9403441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 9413441f04bSAnton Blanchard i = 0; 9423441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 9433441f04bSAnton Blanchard sg = next; 9443441f04bSAnton Blanchard } 9453441f04bSAnton Blanchard 9463441f04bSAnton Blanchard vmalloc_addr += length; 9473441f04bSAnton Blanchard vmalloc_size -= length; 9483441f04bSAnton Blanchard } 9493441f04bSAnton Blanchard 9503441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 9513441f04bSAnton Blanchard 9523441f04bSAnton Blanchard return first; 9533441f04bSAnton Blanchard 9543441f04bSAnton Blanchard nomem: 9553441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 9563441f04bSAnton Blanchard opal_free_sg_list(first); 9573441f04bSAnton Blanchard return NULL; 9583441f04bSAnton Blanchard } 9593441f04bSAnton Blanchard 9603441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 9613441f04bSAnton Blanchard { 9623441f04bSAnton Blanchard while (sg) { 9633441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 9643441f04bSAnton Blanchard 9653441f04bSAnton Blanchard kfree(sg); 9663441f04bSAnton Blanchard 9673441f04bSAnton Blanchard if (next) 9683441f04bSAnton Blanchard sg = __va(next); 9693441f04bSAnton Blanchard else 9703441f04bSAnton Blanchard sg = NULL; 9713441f04bSAnton Blanchard } 9723441f04bSAnton Blanchard } 97316b1d26eSNeelesh Gupta 974e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 975e3c5c2e0SCédric Le Goater { 976e3c5c2e0SCédric Le Goater switch (rc) { 977e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 978e3c5c2e0SCédric Le Goater 979e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 980e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 981e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 982e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 98314aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 984e3c5c2e0SCédric Le Goater 985e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 986e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 987e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 988cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 989e3c5c2e0SCédric Le Goater default: 990e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 991e3c5c2e0SCédric Le Goater return -EIO; 992e3c5c2e0SCédric Le Goater } 993e3c5c2e0SCédric Le Goater } 994e3c5c2e0SCédric Le Goater 9951d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 9961d0761d2SAlistair Popple { 9971d0761d2SAlistair Popple int rc; 9981d0761d2SAlistair Popple 9991d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 10001d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 10011d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 10021d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 10031d0761d2SAlistair Popple } 10041d0761d2SAlistair Popple } 10051d0761d2SAlistair Popple 100616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 100716b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 100816b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 100916b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 101016b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 101147083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 1012c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1013c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1014c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 101543a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 101643a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1017ffe6d810SPaul Mackerras /* Export this for KVM */ 1018ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 10195af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 1020