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> 396fcd6baaSNicholas Piggin #include <asm/bug.h> 4014a43e69SBenjamin Herrenschmidt 4114a43e69SBenjamin Herrenschmidt #include "powernv.h" 4214a43e69SBenjamin Herrenschmidt 436f68b5e2SVasant Hegde /* /sys/firmware/opal */ 446f68b5e2SVasant Hegde struct kobject *opal_kobj; 456f68b5e2SVasant Hegde 4614a43e69SBenjamin Herrenschmidt struct opal { 4714a43e69SBenjamin Herrenschmidt u64 base; 4814a43e69SBenjamin Herrenschmidt u64 entry; 4955672ecfSMahesh Salgaonkar u64 size; 5014a43e69SBenjamin Herrenschmidt } opal; 5114a43e69SBenjamin Herrenschmidt 5255672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 5355672ecfSMahesh Salgaonkar u64 start_addr; 5455672ecfSMahesh Salgaonkar u64 end_addr; 5555672ecfSMahesh Salgaonkar u64 recover_addr; 5655672ecfSMahesh Salgaonkar }; 5755672ecfSMahesh Salgaonkar 5855672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5955672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 6055672ecfSMahesh Salgaonkar 61bfc36894SJoel Stanley struct device_node *opal_node; 6214a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 6324366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 643bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 65a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 6614a43e69SBenjamin Herrenschmidt 67d3cbff1bSBenjamin Herrenschmidt void opal_configure_cores(void) 684926616cSBenjamin Herrenschmidt { 691c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 701c0eaf0fSBenjamin Herrenschmidt 714926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 724926616cSBenjamin Herrenschmidt * 734926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 744926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 754926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 764926616cSBenjamin Herrenschmidt */ 774926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 781c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 794926616cSBenjamin Herrenschmidt #else 801c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 814926616cSBenjamin Herrenschmidt #endif 82d3cbff1bSBenjamin Herrenschmidt 831c0eaf0fSBenjamin Herrenschmidt /* 841c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 851c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 861c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 871c0eaf0fSBenjamin Herrenschmidt */ 88a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 891c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 901c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 911c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 921c0eaf0fSBenjamin Herrenschmidt } 931c0eaf0fSBenjamin Herrenschmidt 941c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 951c0eaf0fSBenjamin Herrenschmidt 96d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 97d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 98d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 994926616cSBenjamin Herrenschmidt } 1004926616cSBenjamin Herrenschmidt 10114a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 10214a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 10314a43e69SBenjamin Herrenschmidt { 10455672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 1059d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 10614a43e69SBenjamin Herrenschmidt 10714a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10814a43e69SBenjamin Herrenschmidt return 0; 10914a43e69SBenjamin Herrenschmidt 11014a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 11114a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 11255672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 11314a43e69SBenjamin Herrenschmidt 11455672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 11514a43e69SBenjamin Herrenschmidt return 1; 11614a43e69SBenjamin Herrenschmidt 11714a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 11814a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 11955672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 12014a43e69SBenjamin Herrenschmidt 1219d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 12214a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1239d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 12414a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1259d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 12655672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 12714a43e69SBenjamin Herrenschmidt 12875b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 129e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 1305138b314SBenjamin Herrenschmidt pr_debug("OPAL detected !\n"); 13114a43e69SBenjamin Herrenschmidt } else { 132786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 13314a43e69SBenjamin Herrenschmidt } 13414a43e69SBenjamin Herrenschmidt 135c4463b37SJeremy Kerr return 1; 136c4463b37SJeremy Kerr } 137c4463b37SJeremy Kerr 13855672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13955672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 14055672ecfSMahesh Salgaonkar { 1419d0c4dfeSRob Herring int i, psize, size; 14255672ecfSMahesh Salgaonkar const __be32 *prop; 14355672ecfSMahesh Salgaonkar 14455672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 14555672ecfSMahesh Salgaonkar return 0; 14655672ecfSMahesh Salgaonkar 1476e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 14855672ecfSMahesh Salgaonkar 14955672ecfSMahesh Salgaonkar if (!prop) 15055672ecfSMahesh Salgaonkar return 1; 15155672ecfSMahesh Salgaonkar 15255672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 15355672ecfSMahesh Salgaonkar 15455672ecfSMahesh Salgaonkar /* 1556e556b47SMahesh Salgaonkar * Calculate number of available entries. 1566e556b47SMahesh Salgaonkar * 1576e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1586e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1596e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1606e556b47SMahesh Salgaonkar */ 1616e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1626e556b47SMahesh Salgaonkar 1636e556b47SMahesh Salgaonkar /* Sanity check */ 1646e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1656e556b47SMahesh Salgaonkar return 1; 1666e556b47SMahesh Salgaonkar 1676e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1686e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1696e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1706e556b47SMahesh Salgaonkar 1716e556b47SMahesh Salgaonkar /* 17276b42e28SNicholas Piggin * Allocate a buffer to hold the MC recoverable ranges. 17355672ecfSMahesh Salgaonkar */ 17476b42e28SNicholas Piggin mc_recoverable_range =__va(memblock_alloc(size, __alignof__(u64))); 17555672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 17655672ecfSMahesh Salgaonkar 1776e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17855672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17955672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 18055672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 18155672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 18255672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 18355672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 18455672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 18555672ecfSMahesh Salgaonkar 18655672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18755672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18855672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18955672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 19055672ecfSMahesh Salgaonkar } 19155672ecfSMahesh Salgaonkar return 1; 19255672ecfSMahesh Salgaonkar } 19355672ecfSMahesh Salgaonkar 194c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 195c4463b37SJeremy Kerr { 19629186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 197c4463b37SJeremy Kerr u64 glue; 198c4463b37SJeremy Kerr 199c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 200c4463b37SJeremy Kerr return -ENODEV; 201c4463b37SJeremy Kerr 20228446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 20328446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 204ed79ba9eSBenjamin Herrenschmidt */ 205ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2066507955cSMahesh Salgaonkar 2076507955cSMahesh Salgaonkar /* 2086507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2096507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2106507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2116507955cSMahesh Salgaonkar * 2126507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2136507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2146507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2156507955cSMahesh Salgaonkar * 2166507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2176507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2186507955cSMahesh Salgaonkar */ 2196507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 22008135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2216507955cSMahesh Salgaonkar opal_register_exception_handler( 2226507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2236507955cSMahesh Salgaonkar 0, glue); 2246507955cSMahesh Salgaonkar glue += 128; 2256507955cSMahesh Salgaonkar } 2266507955cSMahesh Salgaonkar 227ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 22829186097SBenjamin Herrenschmidt #endif 229ed79ba9eSBenjamin Herrenschmidt 230c4463b37SJeremy Kerr return 0; 23114a43e69SBenjamin Herrenschmidt } 232b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 233c4463b37SJeremy Kerr 23424366360SMahesh Salgaonkar /* 23524366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 23624366360SMahesh Salgaonkar * notified for specific messgae type. 23724366360SMahesh Salgaonkar */ 238d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 23924366360SMahesh Salgaonkar struct notifier_block *nb) 24024366360SMahesh Salgaonkar { 241792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 242f2c2cbccSJoe Perches pr_warn("%s: Invalid arguments, msg_type:%d\n", 24324366360SMahesh Salgaonkar __func__, msg_type); 24424366360SMahesh Salgaonkar return -EINVAL; 24524366360SMahesh Salgaonkar } 246792f96e9SNeelesh Gupta 24724366360SMahesh Salgaonkar return atomic_notifier_chain_register( 24824366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 24924366360SMahesh Salgaonkar } 250594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 25124366360SMahesh Salgaonkar 252df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 253b921e902SNeelesh Gupta struct notifier_block *nb) 254b921e902SNeelesh Gupta { 255b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 256b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 257b921e902SNeelesh Gupta } 258594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 259b921e902SNeelesh Gupta 26024366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 26124366360SMahesh Salgaonkar { 26224366360SMahesh Salgaonkar /* notify subscribers */ 26324366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 26424366360SMahesh Salgaonkar msg_type, msg); 26524366360SMahesh Salgaonkar } 26624366360SMahesh Salgaonkar 26724366360SMahesh Salgaonkar static void opal_handle_message(void) 26824366360SMahesh Salgaonkar { 26924366360SMahesh Salgaonkar s64 ret; 27024366360SMahesh Salgaonkar /* 27124366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 27224366360SMahesh Salgaonkar * value in /proc/device-tree. 27324366360SMahesh Salgaonkar */ 27424366360SMahesh Salgaonkar static struct opal_msg msg; 275bb4398e1SAnton Blanchard u32 type; 27624366360SMahesh Salgaonkar 27724366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 27824366360SMahesh Salgaonkar /* No opal message pending. */ 27924366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 28024366360SMahesh Salgaonkar return; 28124366360SMahesh Salgaonkar 28224366360SMahesh Salgaonkar /* check for errors. */ 28324366360SMahesh Salgaonkar if (ret) { 284f2c2cbccSJoe Perches pr_warn("%s: Failed to retrieve opal message, err=%lld\n", 28524366360SMahesh Salgaonkar __func__, ret); 28624366360SMahesh Salgaonkar return; 28724366360SMahesh Salgaonkar } 28824366360SMahesh Salgaonkar 289bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 290bb4398e1SAnton Blanchard 29124366360SMahesh Salgaonkar /* Sanity check */ 292792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 29398da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 29424366360SMahesh Salgaonkar return; 29524366360SMahesh Salgaonkar } 296bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 29724366360SMahesh Salgaonkar } 29824366360SMahesh Salgaonkar 299a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 30024366360SMahesh Salgaonkar { 30124366360SMahesh Salgaonkar opal_handle_message(); 302a295af24SAlistair Popple return IRQ_HANDLED; 30324366360SMahesh Salgaonkar } 30424366360SMahesh Salgaonkar 30524366360SMahesh Salgaonkar static int __init opal_message_init(void) 30624366360SMahesh Salgaonkar { 307a295af24SAlistair Popple int ret, i, irq; 30824366360SMahesh Salgaonkar 30924366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 31024366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 31124366360SMahesh Salgaonkar 312a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 313a295af24SAlistair Popple if (!irq) { 314a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 315a295af24SAlistair Popple __func__, irq); 316a295af24SAlistair Popple return irq; 317a295af24SAlistair Popple } 318a295af24SAlistair Popple 319a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 320a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 32124366360SMahesh Salgaonkar if (ret) { 322a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 32324366360SMahesh Salgaonkar __func__, ret); 32424366360SMahesh Salgaonkar return ret; 32524366360SMahesh Salgaonkar } 326a295af24SAlistair Popple 32724366360SMahesh Salgaonkar return 0; 32824366360SMahesh Salgaonkar } 32924366360SMahesh Salgaonkar 33014a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 33114a43e69SBenjamin Herrenschmidt { 3324f89363bSBenjamin Herrenschmidt s64 rc; 3334f89363bSBenjamin Herrenschmidt __be64 evt, len; 33414a43e69SBenjamin Herrenschmidt 33514a43e69SBenjamin Herrenschmidt if (!opal.entry) 336daea1175SBenjamin Herrenschmidt return -ENODEV; 33714a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3384f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 33914a43e69SBenjamin Herrenschmidt return 0; 3404f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 34114a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 34214a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3434f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 34414a43e69SBenjamin Herrenschmidt return 0; 34514a43e69SBenjamin Herrenschmidt } 34614a43e69SBenjamin Herrenschmidt 34714a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 34814a43e69SBenjamin Herrenschmidt { 34914a43e69SBenjamin Herrenschmidt int written = 0; 3504f89363bSBenjamin Herrenschmidt __be64 olen; 351daea1175SBenjamin Herrenschmidt s64 len, rc; 35214a43e69SBenjamin Herrenschmidt unsigned long flags; 3534f89363bSBenjamin Herrenschmidt __be64 evt; 35414a43e69SBenjamin Herrenschmidt 35514a43e69SBenjamin Herrenschmidt if (!opal.entry) 356daea1175SBenjamin Herrenschmidt return -ENODEV; 35714a43e69SBenjamin Herrenschmidt 35814a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 35914a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 360daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 361daea1175SBenjamin Herrenschmidt * 362daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 363daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 364daea1175SBenjamin Herrenschmidt * enough room and be done with it 36514a43e69SBenjamin Herrenschmidt */ 36614a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3674f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3684f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 36914a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 37014a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 37114a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 37214a43e69SBenjamin Herrenschmidt if (rc) 37314a43e69SBenjamin Herrenschmidt return total_len; 3744f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 37514a43e69SBenjamin Herrenschmidt return -EAGAIN; 37614a43e69SBenjamin Herrenschmidt } 37714a43e69SBenjamin Herrenschmidt 37814a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 37914a43e69SBenjamin Herrenschmidt * should no longer happen. 38014a43e69SBenjamin Herrenschmidt */ 38136d2dabcSNicholas Piggin 38236d2dabcSNicholas Piggin while (total_len > 0) { 3834f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 38436d2dabcSNicholas Piggin 38536d2dabcSNicholas Piggin rc = OPAL_BUSY; 38636d2dabcSNicholas Piggin while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 3874f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 38836d2dabcSNicholas Piggin if (rc == OPAL_BUSY_EVENT) { 38936d2dabcSNicholas Piggin mdelay(OPAL_BUSY_DELAY_MS); 39036d2dabcSNicholas Piggin opal_poll_events(NULL); 39136d2dabcSNicholas Piggin } else if (rc == OPAL_BUSY) { 39236d2dabcSNicholas Piggin mdelay(OPAL_BUSY_DELAY_MS); 39336d2dabcSNicholas Piggin } 39436d2dabcSNicholas Piggin } 39536d2dabcSNicholas Piggin 3964f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3971de1455fSBenjamin Herrenschmidt 3981de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 39936d2dabcSNicholas Piggin if (rc != OPAL_SUCCESS) { 40036d2dabcSNicholas Piggin written += total_len; /* drop remaining chars */ 4011de1455fSBenjamin Herrenschmidt break; 4021de1455fSBenjamin Herrenschmidt } 40336d2dabcSNicholas Piggin 40414a43e69SBenjamin Herrenschmidt total_len -= len; 40514a43e69SBenjamin Herrenschmidt data += len; 40614a43e69SBenjamin Herrenschmidt written += len; 40736d2dabcSNicholas Piggin 40814a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 40914a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 41014a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 41114a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 41214a43e69SBenjamin Herrenschmidt */ 41336d2dabcSNicholas Piggin do { 41414a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 41536d2dabcSNicholas Piggin } while (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT); 41614a43e69SBenjamin Herrenschmidt } 41714a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 41814a43e69SBenjamin Herrenschmidt return written; 41914a43e69SBenjamin Herrenschmidt } 42014a43e69SBenjamin Herrenschmidt 421b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 422b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 423b63a0ffeSMahesh Salgaonkar { 424b63a0ffeSMahesh Salgaonkar int recovered = 0; 425b63a0ffeSMahesh Salgaonkar 426b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 427b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 428c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 429b63a0ffeSMahesh Salgaonkar recovered = 0; 430b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 431b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 432b63a0ffeSMahesh Salgaonkar recovered = 1; 4331363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 4341363875bSNicholas Piggin /* Fatal machine check */ 4351363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 4361363875bSNicholas Piggin recovered = 0; 4376fcd6baaSNicholas Piggin } 4386fcd6baaSNicholas Piggin 4396fcd6baaSNicholas Piggin if (!recovered && evt->severity == MCE_SEV_ERROR_SYNC) { 440b63a0ffeSMahesh Salgaonkar /* 4416fcd6baaSNicholas Piggin * Try to kill processes if we get a synchronous machine check 4426fcd6baaSNicholas Piggin * (e.g., one caused by execution of this instruction). This 4436fcd6baaSNicholas Piggin * will devolve into a panic if we try to kill init or are in 4446fcd6baaSNicholas Piggin * an interrupt etc. 445b63a0ffeSMahesh Salgaonkar * 446b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 4476fcd6baaSNicholas Piggin * TODO: This is not quite right for d-side machine 4486fcd6baaSNicholas Piggin * checks ->nip is not necessarily the important 4496fcd6baaSNicholas Piggin * address. 450b63a0ffeSMahesh Salgaonkar */ 4516fcd6baaSNicholas Piggin if ((user_mode(regs))) { 452b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 453b63a0ffeSMahesh Salgaonkar recovered = 1; 4546fcd6baaSNicholas Piggin } else if (die_will_crash()) { 4556fcd6baaSNicholas Piggin /* 4566fcd6baaSNicholas Piggin * die() would kill the kernel, so better to go via 4576fcd6baaSNicholas Piggin * the platform reboot code that will log the 4586fcd6baaSNicholas Piggin * machine check. 4596fcd6baaSNicholas Piggin */ 4606fcd6baaSNicholas Piggin recovered = 0; 4616fcd6baaSNicholas Piggin } else { 4626fcd6baaSNicholas Piggin die("Machine check", regs, SIGBUS); 4636fcd6baaSNicholas Piggin recovered = 1; 464b63a0ffeSMahesh Salgaonkar } 4656fcd6baaSNicholas Piggin } 4666fcd6baaSNicholas Piggin 467b63a0ffeSMahesh Salgaonkar return recovered; 468b63a0ffeSMahesh Salgaonkar } 469b63a0ffeSMahesh Salgaonkar 470b746e3e0SNicholas Piggin void pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 471b746e3e0SNicholas Piggin { 47235adacd6SNicholas Piggin panic_flush_kmsg_start(); 47335adacd6SNicholas Piggin 474b746e3e0SNicholas Piggin pr_emerg("Hardware platform error: %s\n", msg); 475b746e3e0SNicholas Piggin if (regs) 476b746e3e0SNicholas Piggin show_regs(regs); 477b746e3e0SNicholas Piggin smp_send_stop(); 47835adacd6SNicholas Piggin 47935adacd6SNicholas Piggin panic_flush_kmsg_end(); 480b746e3e0SNicholas Piggin 481b746e3e0SNicholas Piggin /* 482b746e3e0SNicholas Piggin * Don't bother to shut things down because this will 483b746e3e0SNicholas Piggin * xstop the system. 484b746e3e0SNicholas Piggin */ 485b746e3e0SNicholas Piggin if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 486b746e3e0SNicholas Piggin == OPAL_UNSUPPORTED) { 487b746e3e0SNicholas Piggin pr_emerg("Reboot type %d not supported for %s\n", 488b746e3e0SNicholas Piggin OPAL_REBOOT_PLATFORM_ERROR, msg); 489b746e3e0SNicholas Piggin } 490b746e3e0SNicholas Piggin 491b746e3e0SNicholas Piggin /* 492b746e3e0SNicholas Piggin * We reached here. There can be three possibilities: 493b746e3e0SNicholas Piggin * 1. We are running on a firmware level that do not support 494b746e3e0SNicholas Piggin * opal_cec_reboot2() 495b746e3e0SNicholas Piggin * 2. We are running on a firmware level that do not support 496b746e3e0SNicholas Piggin * OPAL_REBOOT_PLATFORM_ERROR reboot type. 497b746e3e0SNicholas Piggin * 3. We are running on FSP based system that does not need 498b746e3e0SNicholas Piggin * opal to trigger checkstop explicitly for error analysis. 499b746e3e0SNicholas Piggin * The FSP PRD component would have already got notified 500b746e3e0SNicholas Piggin * about this error through other channels. 5015ee573e8SBalbir Singh * 4. We are running on a newer skiboot that by default does 5025ee573e8SBalbir Singh * not cause a checkstop, drops us back to the kernel to 5035ee573e8SBalbir Singh * extract context and state at the time of the error. 504b746e3e0SNicholas Piggin */ 505b746e3e0SNicholas Piggin 5065ee573e8SBalbir Singh panic(msg); 507b746e3e0SNicholas Piggin } 508b746e3e0SNicholas Piggin 509ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 510ed79ba9eSBenjamin Herrenschmidt { 51136df96f8SMahesh Salgaonkar struct machine_check_event evt; 512ed79ba9eSBenjamin Herrenschmidt 51336df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 51436df96f8SMahesh Salgaonkar return 0; 515ed79ba9eSBenjamin Herrenschmidt 516ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 51736df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 518ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 519ed79ba9eSBenjamin Herrenschmidt evt.version); 520ed79ba9eSBenjamin Herrenschmidt return 0; 521ed79ba9eSBenjamin Herrenschmidt } 52263f44d65SMichael Ellerman machine_check_print_event_info(&evt, user_mode(regs)); 523ed79ba9eSBenjamin Herrenschmidt 524b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 525b63a0ffeSMahesh Salgaonkar return 1; 526e784b649SMahesh Salgaonkar 527b746e3e0SNicholas Piggin pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 528ed79ba9eSBenjamin Herrenschmidt } 529ed79ba9eSBenjamin Herrenschmidt 5300869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 5310869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 5320869b6fdSMahesh Salgaonkar { 5330ef95b41SMahesh Salgaonkar s64 rc; 5340ef95b41SMahesh Salgaonkar 5350ef95b41SMahesh Salgaonkar /* 5360ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5370ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5380ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5390ef95b41SMahesh Salgaonkar */ 5400ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5410ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5420ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5430ef95b41SMahesh Salgaonkar return 1; 5440ef95b41SMahesh Salgaonkar } 5450869b6fdSMahesh Salgaonkar return 0; 5460869b6fdSMahesh Salgaonkar } 5470869b6fdSMahesh Salgaonkar 5480869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5490869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5500869b6fdSMahesh Salgaonkar { 5510ef95b41SMahesh Salgaonkar /* 5520ef95b41SMahesh Salgaonkar * Check if HMI event is available. 55356c0b48bSNicholas Piggin * if Yes, then wake kopald to process them. 5540ef95b41SMahesh Salgaonkar */ 5550ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5560869b6fdSMahesh Salgaonkar return 0; 5570ef95b41SMahesh Salgaonkar 5580ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 55956c0b48bSNicholas Piggin opal_wake_poller(); 5600ef95b41SMahesh Salgaonkar 5610ef95b41SMahesh Salgaonkar return 1; 5620869b6fdSMahesh Salgaonkar } 5630869b6fdSMahesh Salgaonkar 56455672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 56555672ecfSMahesh Salgaonkar { 56655672ecfSMahesh Salgaonkar int i; 56755672ecfSMahesh Salgaonkar 56855672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 56955672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 57055672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 57155672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 57255672ecfSMahesh Salgaonkar return 0; 57355672ecfSMahesh Salgaonkar } 57455672ecfSMahesh Salgaonkar 57555672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 57655672ecfSMahesh Salgaonkar { 57755672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 57855672ecfSMahesh Salgaonkar 57955672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 58055672ecfSMahesh Salgaonkar goto out; 58155672ecfSMahesh Salgaonkar 58255672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 583dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 58455672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 58555672ecfSMahesh Salgaonkar 58655672ecfSMahesh Salgaonkar /* 58755672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 58855672ecfSMahesh Salgaonkar */ 58955672ecfSMahesh Salgaonkar if (recover_addr) 59055672ecfSMahesh Salgaonkar regs->nip = recover_addr; 59155672ecfSMahesh Salgaonkar 59255672ecfSMahesh Salgaonkar out: 59355672ecfSMahesh Salgaonkar return !!recover_addr; 59455672ecfSMahesh Salgaonkar } 59555672ecfSMahesh Salgaonkar 5966f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5976f68b5e2SVasant Hegde { 5986f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5996f68b5e2SVasant Hegde if (!opal_kobj) { 6006f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 6016f68b5e2SVasant Hegde return -ENOMEM; 6026f68b5e2SVasant Hegde } 6036f68b5e2SVasant Hegde 6046f68b5e2SVasant Hegde return 0; 6056f68b5e2SVasant Hegde } 6066f68b5e2SVasant Hegde 607c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 608c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 609c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 610c8742f85SBenjamin Herrenschmidt { 611c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 612c8742f85SBenjamin Herrenschmidt bin_attr->size); 613c8742f85SBenjamin Herrenschmidt } 614c8742f85SBenjamin Herrenschmidt 615c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 616c8742f85SBenjamin Herrenschmidt 617c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 618c8742f85SBenjamin Herrenschmidt { 619c8742f85SBenjamin Herrenschmidt const __be64 *syms; 620c8742f85SBenjamin Herrenschmidt unsigned int size; 621c8742f85SBenjamin Herrenschmidt struct device_node *fw; 622c8742f85SBenjamin Herrenschmidt int rc; 623c8742f85SBenjamin Herrenschmidt 624c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 625c8742f85SBenjamin Herrenschmidt if (!fw) 626c8742f85SBenjamin Herrenschmidt return; 627c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 628c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 629c8742f85SBenjamin Herrenschmidt return; 630c8742f85SBenjamin Herrenschmidt 631c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 632c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 633c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 634c8742f85SBenjamin Herrenschmidt 635c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 636c8742f85SBenjamin Herrenschmidt if (rc) 637c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 638c8742f85SBenjamin Herrenschmidt } 639c8742f85SBenjamin Herrenschmidt 64011fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 64111fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 64211fe909dSMatt Brown loff_t off, size_t count) 64311fe909dSMatt Brown { 64411fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 64511fe909dSMatt Brown bin_attr->size); 64611fe909dSMatt Brown } 64711fe909dSMatt Brown 64811fe909dSMatt Brown /* 64911fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 65011fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 65111fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 65211fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 65311fe909dSMatt Brown * The new sysfs nodes are only readable by root. 65411fe909dSMatt Brown */ 65511fe909dSMatt Brown static void opal_export_attrs(void) 65611fe909dSMatt Brown { 65711fe909dSMatt Brown struct bin_attribute *attr; 65811fe909dSMatt Brown struct device_node *np; 65911fe909dSMatt Brown struct property *prop; 66011fe909dSMatt Brown struct kobject *kobj; 66111fe909dSMatt Brown u64 vals[2]; 66211fe909dSMatt Brown int rc; 66311fe909dSMatt Brown 66411fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 66511fe909dSMatt Brown if (!np) 66611fe909dSMatt Brown return; 66711fe909dSMatt Brown 66811fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 66911fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 67011fe909dSMatt Brown if (!kobj) { 67111fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 67211fe909dSMatt Brown return; 67311fe909dSMatt Brown } 67411fe909dSMatt Brown 67511fe909dSMatt Brown for_each_property_of_node(np, prop) { 67611fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 67711fe909dSMatt Brown continue; 67811fe909dSMatt Brown 67911fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 68011fe909dSMatt Brown continue; 68111fe909dSMatt Brown 68283c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 68311fe909dSMatt Brown 68411fe909dSMatt Brown if (attr == NULL) { 68511fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 68611fe909dSMatt Brown continue; 68711fe909dSMatt Brown } 68811fe909dSMatt Brown 68983c49190SMichael Ellerman sysfs_bin_attr_init(attr); 69011fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 69111fe909dSMatt Brown attr->attr.mode = 0400; 69211fe909dSMatt Brown attr->read = export_attr_read; 69311fe909dSMatt Brown attr->private = __va(vals[0]); 69411fe909dSMatt Brown attr->size = vals[1]; 69511fe909dSMatt Brown 69611fe909dSMatt Brown if (attr->attr.name == NULL) { 69711fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 69811fe909dSMatt Brown kfree(attr); 69911fe909dSMatt Brown continue; 70011fe909dSMatt Brown } 70111fe909dSMatt Brown 70211fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 70311fe909dSMatt Brown if (rc) { 70411fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 70511fe909dSMatt Brown rc, prop->name); 70611fe909dSMatt Brown kfree(attr->attr.name); 70711fe909dSMatt Brown kfree(attr); 70811fe909dSMatt Brown } 70911fe909dSMatt Brown } 71011fe909dSMatt Brown 71111fe909dSMatt Brown of_node_put(np); 71211fe909dSMatt Brown } 71311fe909dSMatt Brown 714b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 715b09c2ec4SVasant Hegde { 716b09c2ec4SVasant Hegde void *addr; 717b09c2ec4SVasant Hegde uint64_t size; 718b09c2ec4SVasant Hegde int rc; 719b09c2ec4SVasant Hegde 720b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 721b962f5a4SStewart Smith return; 722b962f5a4SStewart Smith 723b09c2ec4SVasant Hegde /* Register kernel log buffer */ 724b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 7256501ab5eSPranith Kumar if (addr == NULL) 7266501ab5eSPranith Kumar return; 7276501ab5eSPranith Kumar 728b09c2ec4SVasant Hegde size = log_buf_len_get(); 7296501ab5eSPranith Kumar if (size == 0) 7306501ab5eSPranith Kumar return; 7316501ab5eSPranith Kumar 732b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 733b09c2ec4SVasant Hegde __pa(addr), size); 734b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 735b09c2ec4SVasant Hegde * know about that call 736b09c2ec4SVasant Hegde */ 737b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 738b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 739b09c2ec4SVasant Hegde "rc = %d\n", rc); 740b09c2ec4SVasant Hegde } 741608b286dSJeremy Kerr 7429e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 743ed59190eSCyril Bur { 744ed59190eSCyril Bur struct device_node *np; 745ed59190eSCyril Bur 7469e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 74747083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 74847083450SNeelesh Gupta } 74947083450SNeelesh Gupta 7508f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 7518f95faaaSMadhavan Srinivasan { 7528f95faaaSMadhavan Srinivasan struct device_node *np; 7538f95faaaSMadhavan Srinivasan 7548f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 7558f95faaaSMadhavan Srinivasan if (np) 7568f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 7578f95faaaSMadhavan Srinivasan } 7588f95faaaSMadhavan Srinivasan 7593bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 7603bf57561SBenjamin Herrenschmidt { 761a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 7629f0fd049SAlistair Popple 7633bf57561SBenjamin Herrenschmidt set_freezable(); 7643bf57561SBenjamin Herrenschmidt do { 7653bf57561SBenjamin Herrenschmidt try_to_freeze(); 76656c0b48bSNicholas Piggin 76756c0b48bSNicholas Piggin opal_handle_events(); 76856c0b48bSNicholas Piggin 76956c0b48bSNicholas Piggin set_current_state(TASK_INTERRUPTIBLE); 77056c0b48bSNicholas Piggin if (opal_have_pending_events()) 77156c0b48bSNicholas Piggin __set_current_state(TASK_RUNNING); 77256c0b48bSNicholas Piggin else 77356c0b48bSNicholas Piggin schedule_timeout(timeout); 77456c0b48bSNicholas Piggin 7753bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 7763bf57561SBenjamin Herrenschmidt 7773bf57561SBenjamin Herrenschmidt return 0; 7783bf57561SBenjamin Herrenschmidt } 7793bf57561SBenjamin Herrenschmidt 780a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 781a203658bSBenjamin Herrenschmidt { 782a203658bSBenjamin Herrenschmidt if (kopald_tsk) 783a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 784a203658bSBenjamin Herrenschmidt } 785a203658bSBenjamin Herrenschmidt 7863bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 7873bf57561SBenjamin Herrenschmidt { 7883bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 7893bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 7903bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 7913bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 7923bf57561SBenjamin Herrenschmidt 7933bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 794a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 7953bf57561SBenjamin Herrenschmidt } 7963bf57561SBenjamin Herrenschmidt 79714a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 79814a43e69SBenjamin Herrenschmidt { 799c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 800c1c3a526SGavin Shan int rc; 80114a43e69SBenjamin Herrenschmidt 80214a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 80314a43e69SBenjamin Herrenschmidt if (!opal_node) { 80408135139SMichael Ellerman pr_warn("Device node not found\n"); 80514a43e69SBenjamin Herrenschmidt return -ENODEV; 80614a43e69SBenjamin Herrenschmidt } 8072db29d28SBenjamin Herrenschmidt 8082db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 80914a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 8102db29d28SBenjamin Herrenschmidt if (consoles) { 81114a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 81214a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 81314a43e69SBenjamin Herrenschmidt continue; 81414a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 81514a43e69SBenjamin Herrenschmidt } 81614a43e69SBenjamin Herrenschmidt of_node_put(consoles); 8172db29d28SBenjamin Herrenschmidt } 818a125e092SBenjamin Herrenschmidt 81996e023e7SAlistair Popple /* Initialise OPAL messaging system */ 82096e023e7SAlistair Popple opal_message_init(); 82196e023e7SAlistair Popple 82296e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 82396e023e7SAlistair Popple opal_async_comp_init(); 82496e023e7SAlistair Popple 82596e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 82696e023e7SAlistair Popple opal_sensor_init(); 82796e023e7SAlistair Popple 82896e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 82996e023e7SAlistair Popple opal_hmi_handler_init(); 83096e023e7SAlistair Popple 83147083450SNeelesh Gupta /* Create i2c platform devices */ 8329e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 83347083450SNeelesh Gupta 8343013e173SOliver O'Halloran /* Handle non-volatile memory devices */ 8353013e173SOliver O'Halloran opal_pdev_init("pmem-region"); 8363013e173SOliver O'Halloran 8373bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 8383bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 8393bf57561SBenjamin Herrenschmidt 8408f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 8418f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 8428f95faaaSMadhavan Srinivasan 843c159b596SVasant Hegde /* Create leds platform devices */ 844c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 845c159b596SVasant Hegde if (leds) { 846c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 847c159b596SVasant Hegde of_node_put(leds); 848c159b596SVasant Hegde } 849c159b596SVasant Hegde 8509b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 8519b4fffa1SAndrew Donnellan opal_msglog_init(); 8529b4fffa1SAndrew Donnellan 8536f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 8546f68b5e2SVasant Hegde rc = opal_sysfs_init(); 85550bd6153SVasant Hegde if (rc == 0) { 856c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 857c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 858b09c2ec4SVasant Hegde /* Setup dump region interface */ 859b09c2ec4SVasant Hegde opal_dump_region_init(); 860774fea1aSStewart Smith /* Setup error log interface */ 861774fea1aSStewart Smith rc = opal_elog_init(); 86250bd6153SVasant Hegde /* Setup code update interface */ 863ed59190eSCyril Bur opal_flash_update_init(); 864c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 865c7e64b9cSStewart Smith opal_platform_dump_init(); 8664029cd66SNeelesh Gupta /* Setup system parameters interface */ 8674029cd66SNeelesh Gupta opal_sys_param_init(); 8689b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 8699b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 87050bd6153SVasant Hegde } 8716f68b5e2SVasant Hegde 87211fe909dSMatt Brown /* Export all properties */ 87311fe909dSMatt Brown opal_export_attrs(); 87411fe909dSMatt Brown 8750d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 8769e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 8779e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 8789e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 879ed59190eSCyril Bur 88043a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 8819e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 88243a1dd9bSSuraj Jitindar Singh 883affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 884affddff6SRussell Currey opal_kmsg_init(); 885affddff6SRussell Currey 886cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 887cb8b340dSShilpasri G Bhat opal_powercap_init(); 888cb8b340dSShilpasri G Bhat 8898e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 8908e84b2d1SShilpasri G Bhat opal_psr_init(); 8918e84b2d1SShilpasri G Bhat 892bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 893bf957155SShilpasri G Bhat opal_sensor_groups_init(); 894bf957155SShilpasri G Bhat 89514a43e69SBenjamin Herrenschmidt return 0; 89614a43e69SBenjamin Herrenschmidt } 897b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 89873ed148aSBenjamin Herrenschmidt 89973ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 90073ed148aSBenjamin Herrenschmidt { 901f7d98d18SVasant Hegde long rc = OPAL_BUSY; 90273ed148aSBenjamin Herrenschmidt 9039f0fd049SAlistair Popple opal_event_shutdown(); 904f7d98d18SVasant Hegde 905f7d98d18SVasant Hegde /* 906f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 907f7d98d18SVasant Hegde * potentially write to our memory has completed such 908f7d98d18SVasant Hegde * as an ongoing dump retrieval 909f7d98d18SVasant Hegde */ 910f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 911f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 912f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 913f7d98d18SVasant Hegde opal_poll_events(NULL); 914f7d98d18SVasant Hegde else 915f7d98d18SVasant Hegde mdelay(10); 916f7d98d18SVasant Hegde } 917b09c2ec4SVasant Hegde 918b09c2ec4SVasant Hegde /* Unregister memory dump region */ 919b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 920b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 92173ed148aSBenjamin Herrenschmidt } 922e28b05e7SJoel Stanley 923e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 924e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 925594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 926594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 927608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 928608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 929ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 930ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 931ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 9320d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 9333441f04bSAnton Blanchard 9343441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 9353441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 9363441f04bSAnton Blanchard unsigned long vmalloc_size) 9373441f04bSAnton Blanchard { 9383441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 9393441f04bSAnton Blanchard unsigned long i = 0; 9403441f04bSAnton Blanchard 9413441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 9423441f04bSAnton Blanchard if (!sg) 9433441f04bSAnton Blanchard goto nomem; 9443441f04bSAnton Blanchard 9453441f04bSAnton Blanchard first = sg; 9463441f04bSAnton Blanchard 9473441f04bSAnton Blanchard while (vmalloc_size > 0) { 9483441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 9493441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 9503441f04bSAnton Blanchard 9513441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 9523441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 9533441f04bSAnton Blanchard i++; 9543441f04bSAnton Blanchard 9553441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 9563441f04bSAnton Blanchard struct opal_sg_list *next; 9573441f04bSAnton Blanchard 9583441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 9593441f04bSAnton Blanchard if (!next) 9603441f04bSAnton Blanchard goto nomem; 9613441f04bSAnton Blanchard 9623441f04bSAnton Blanchard sg->length = cpu_to_be64( 9633441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 9643441f04bSAnton Blanchard i = 0; 9653441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 9663441f04bSAnton Blanchard sg = next; 9673441f04bSAnton Blanchard } 9683441f04bSAnton Blanchard 9693441f04bSAnton Blanchard vmalloc_addr += length; 9703441f04bSAnton Blanchard vmalloc_size -= length; 9713441f04bSAnton Blanchard } 9723441f04bSAnton Blanchard 9733441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 9743441f04bSAnton Blanchard 9753441f04bSAnton Blanchard return first; 9763441f04bSAnton Blanchard 9773441f04bSAnton Blanchard nomem: 9783441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 9793441f04bSAnton Blanchard opal_free_sg_list(first); 9803441f04bSAnton Blanchard return NULL; 9813441f04bSAnton Blanchard } 9823441f04bSAnton Blanchard 9833441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 9843441f04bSAnton Blanchard { 9853441f04bSAnton Blanchard while (sg) { 9863441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 9873441f04bSAnton Blanchard 9883441f04bSAnton Blanchard kfree(sg); 9893441f04bSAnton Blanchard 9903441f04bSAnton Blanchard if (next) 9913441f04bSAnton Blanchard sg = __va(next); 9923441f04bSAnton Blanchard else 9933441f04bSAnton Blanchard sg = NULL; 9943441f04bSAnton Blanchard } 9953441f04bSAnton Blanchard } 99616b1d26eSNeelesh Gupta 997e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 998e3c5c2e0SCédric Le Goater { 999e3c5c2e0SCédric Le Goater switch (rc) { 1000e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 1001e3c5c2e0SCédric Le Goater 1002e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 1003e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 100477adbd22SCyril Bur case OPAL_BUSY: 1005e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 1006e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 100714aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 1008e3c5c2e0SCédric Le Goater 1009e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 1010e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 1011e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 1012cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 1013e3c5c2e0SCédric Le Goater default: 1014e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1015e3c5c2e0SCédric Le Goater return -EIO; 1016e3c5c2e0SCédric Le Goater } 1017e3c5c2e0SCédric Le Goater } 1018e3c5c2e0SCédric Le Goater 10191d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 10201d0761d2SAlistair Popple { 10211d0761d2SAlistair Popple int rc; 10221d0761d2SAlistair Popple 10231d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 10241d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 10251d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 10261d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 10271d0761d2SAlistair Popple } 10281d0761d2SAlistair Popple } 10291d0761d2SAlistair Popple 103016b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 103116b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 103216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 103316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 103416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 103547083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 1036c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1037c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1038c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 103943a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 104043a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1041ffe6d810SPaul Mackerras /* Export this for KVM */ 1042ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 10435af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 104477adbd22SCyril Bur EXPORT_SYMBOL_GPL(opal_error_code); 1045