114a43e69SBenjamin Herrenschmidt /* 214a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 314a43e69SBenjamin Herrenschmidt * 414a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 514a43e69SBenjamin Herrenschmidt * 614a43e69SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 714a43e69SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 814a43e69SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 914a43e69SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1014a43e69SBenjamin Herrenschmidt */ 1114a43e69SBenjamin Herrenschmidt 12c8742f85SBenjamin Herrenschmidt #define pr_fmt(fmt) "opal: " fmt 1314a43e69SBenjamin Herrenschmidt 14c8742f85SBenjamin Herrenschmidt #include <linux/printk.h> 1514a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1614a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1726a2056eSRob Herring #include <linux/of_fdt.h> 1814a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 19a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 201bc98de2SGavin Shan #include <linux/notifier.h> 2173ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 22b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 236f68b5e2SVasant Hegde #include <linux/kobject.h> 24f7d98d18SVasant Hegde #include <linux/delay.h> 2555672ecfSMahesh Salgaonkar #include <linux/memblock.h> 263bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 273bf57561SBenjamin Herrenschmidt #include <linux/freezer.h> 28b14726c5SMichael Ellerman 29b14726c5SMichael Ellerman #include <asm/machdep.h> 3014a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 3114a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3236df96f8SMahesh Salgaonkar #include <asm/mce.h> 3314a43e69SBenjamin Herrenschmidt 3414a43e69SBenjamin Herrenschmidt #include "powernv.h" 3514a43e69SBenjamin Herrenschmidt 366f68b5e2SVasant Hegde /* /sys/firmware/opal */ 376f68b5e2SVasant Hegde struct kobject *opal_kobj; 386f68b5e2SVasant Hegde 3914a43e69SBenjamin Herrenschmidt struct opal { 4014a43e69SBenjamin Herrenschmidt u64 base; 4114a43e69SBenjamin Herrenschmidt u64 entry; 4255672ecfSMahesh Salgaonkar u64 size; 4314a43e69SBenjamin Herrenschmidt } opal; 4414a43e69SBenjamin Herrenschmidt 4555672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4655672ecfSMahesh Salgaonkar u64 start_addr; 4755672ecfSMahesh Salgaonkar u64 end_addr; 4855672ecfSMahesh Salgaonkar u64 recover_addr; 4955672ecfSMahesh Salgaonkar }; 5055672ecfSMahesh Salgaonkar 5155672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5255672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5355672ecfSMahesh Salgaonkar 54bfc36894SJoel Stanley struct device_node *opal_node; 5514a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 5624366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 573bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 5814a43e69SBenjamin Herrenschmidt 594926616cSBenjamin Herrenschmidt static void opal_reinit_cores(void) 604926616cSBenjamin Herrenschmidt { 614926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 624926616cSBenjamin Herrenschmidt * 634926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 644926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 654926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 664926616cSBenjamin Herrenschmidt */ 674926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 684926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 694926616cSBenjamin Herrenschmidt #else 704926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 714926616cSBenjamin Herrenschmidt #endif 724926616cSBenjamin Herrenschmidt } 734926616cSBenjamin Herrenschmidt 7414a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 7514a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 7614a43e69SBenjamin Herrenschmidt { 7755672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 789d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 7914a43e69SBenjamin Herrenschmidt 8014a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 8114a43e69SBenjamin Herrenschmidt return 0; 8214a43e69SBenjamin Herrenschmidt 8314a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 8414a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 8555672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 8614a43e69SBenjamin Herrenschmidt 8755672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 8814a43e69SBenjamin Herrenschmidt return 1; 8914a43e69SBenjamin Herrenschmidt 9014a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 9114a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 9255672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 9314a43e69SBenjamin Herrenschmidt 949d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 9514a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 969d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 9714a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 989d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 9955672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 10014a43e69SBenjamin Herrenschmidt 10175b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 102e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 103e4d54f71SStewart Smith pr_info("OPAL detected !\n"); 10414a43e69SBenjamin Herrenschmidt } else { 105786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 10614a43e69SBenjamin Herrenschmidt } 10714a43e69SBenjamin Herrenschmidt 1084926616cSBenjamin Herrenschmidt /* Reinit all cores with the right endian */ 1094926616cSBenjamin Herrenschmidt opal_reinit_cores(); 1104926616cSBenjamin Herrenschmidt 1114926616cSBenjamin Herrenschmidt /* Restore some bits */ 1124926616cSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 1134926616cSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 1144926616cSBenjamin Herrenschmidt 115c4463b37SJeremy Kerr return 1; 116c4463b37SJeremy Kerr } 117c4463b37SJeremy Kerr 11855672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 11955672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 12055672ecfSMahesh Salgaonkar { 1219d0c4dfeSRob Herring int i, psize, size; 12255672ecfSMahesh Salgaonkar const __be32 *prop; 12355672ecfSMahesh Salgaonkar 12455672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 12555672ecfSMahesh Salgaonkar return 0; 12655672ecfSMahesh Salgaonkar 1276e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 12855672ecfSMahesh Salgaonkar 12955672ecfSMahesh Salgaonkar if (!prop) 13055672ecfSMahesh Salgaonkar return 1; 13155672ecfSMahesh Salgaonkar 13255672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 13355672ecfSMahesh Salgaonkar 13455672ecfSMahesh Salgaonkar /* 1356e556b47SMahesh Salgaonkar * Calculate number of available entries. 1366e556b47SMahesh Salgaonkar * 1376e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1386e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1396e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1406e556b47SMahesh Salgaonkar */ 1416e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1426e556b47SMahesh Salgaonkar 1436e556b47SMahesh Salgaonkar /* Sanity check */ 1446e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1456e556b47SMahesh Salgaonkar return 1; 1466e556b47SMahesh Salgaonkar 1476e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1486e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1496e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1506e556b47SMahesh Salgaonkar 1516e556b47SMahesh Salgaonkar /* 15255672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 15355672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 15455672ecfSMahesh Salgaonkar * RMO region. 15555672ecfSMahesh Salgaonkar */ 15655672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 15755672ecfSMahesh Salgaonkar ppc64_rma_size)); 15855672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 15955672ecfSMahesh Salgaonkar 1606e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 16155672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 16255672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 16355672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 16455672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 16555672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 16655672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 16755672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 16855672ecfSMahesh Salgaonkar 16955672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 17055672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 17155672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 17255672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 17355672ecfSMahesh Salgaonkar } 17455672ecfSMahesh Salgaonkar return 1; 17555672ecfSMahesh Salgaonkar } 17655672ecfSMahesh Salgaonkar 177c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 178c4463b37SJeremy Kerr { 17929186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 180c4463b37SJeremy Kerr u64 glue; 181c4463b37SJeremy Kerr 182c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 183c4463b37SJeremy Kerr return -ENODEV; 184c4463b37SJeremy Kerr 18528446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 18628446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 187ed79ba9eSBenjamin Herrenschmidt */ 188ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 1896507955cSMahesh Salgaonkar 1906507955cSMahesh Salgaonkar /* 1916507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 1926507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 1936507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 1946507955cSMahesh Salgaonkar * 1956507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 1966507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 1976507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 1986507955cSMahesh Salgaonkar * 1996507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2006507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2016507955cSMahesh Salgaonkar */ 2026507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 20308135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2046507955cSMahesh Salgaonkar opal_register_exception_handler( 2056507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2066507955cSMahesh Salgaonkar 0, glue); 2076507955cSMahesh Salgaonkar glue += 128; 2086507955cSMahesh Salgaonkar } 2096507955cSMahesh Salgaonkar 210ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 21129186097SBenjamin Herrenschmidt #endif 212ed79ba9eSBenjamin Herrenschmidt 213c4463b37SJeremy Kerr return 0; 21414a43e69SBenjamin Herrenschmidt } 215b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 216c4463b37SJeremy Kerr 21724366360SMahesh Salgaonkar /* 21824366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 21924366360SMahesh Salgaonkar * notified for specific messgae type. 22024366360SMahesh Salgaonkar */ 221d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 22224366360SMahesh Salgaonkar struct notifier_block *nb) 22324366360SMahesh Salgaonkar { 224792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 225792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 22624366360SMahesh Salgaonkar __func__, msg_type); 22724366360SMahesh Salgaonkar return -EINVAL; 22824366360SMahesh Salgaonkar } 229792f96e9SNeelesh Gupta 23024366360SMahesh Salgaonkar return atomic_notifier_chain_register( 23124366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 23224366360SMahesh Salgaonkar } 233594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 23424366360SMahesh Salgaonkar 235df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 236b921e902SNeelesh Gupta struct notifier_block *nb) 237b921e902SNeelesh Gupta { 238b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 239b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 240b921e902SNeelesh Gupta } 241594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 242b921e902SNeelesh Gupta 24324366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 24424366360SMahesh Salgaonkar { 24524366360SMahesh Salgaonkar /* notify subscribers */ 24624366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 24724366360SMahesh Salgaonkar msg_type, msg); 24824366360SMahesh Salgaonkar } 24924366360SMahesh Salgaonkar 25024366360SMahesh Salgaonkar static void opal_handle_message(void) 25124366360SMahesh Salgaonkar { 25224366360SMahesh Salgaonkar s64 ret; 25324366360SMahesh Salgaonkar /* 25424366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 25524366360SMahesh Salgaonkar * value in /proc/device-tree. 25624366360SMahesh Salgaonkar */ 25724366360SMahesh Salgaonkar static struct opal_msg msg; 258bb4398e1SAnton Blanchard u32 type; 25924366360SMahesh Salgaonkar 26024366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 26124366360SMahesh Salgaonkar /* No opal message pending. */ 26224366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 26324366360SMahesh Salgaonkar return; 26424366360SMahesh Salgaonkar 26524366360SMahesh Salgaonkar /* check for errors. */ 26624366360SMahesh Salgaonkar if (ret) { 2671a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 26824366360SMahesh Salgaonkar __func__, ret); 26924366360SMahesh Salgaonkar return; 27024366360SMahesh Salgaonkar } 27124366360SMahesh Salgaonkar 272bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 273bb4398e1SAnton Blanchard 27424366360SMahesh Salgaonkar /* Sanity check */ 275792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 27698da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 27724366360SMahesh Salgaonkar return; 27824366360SMahesh Salgaonkar } 279bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 28024366360SMahesh Salgaonkar } 28124366360SMahesh Salgaonkar 282a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 28324366360SMahesh Salgaonkar { 28424366360SMahesh Salgaonkar opal_handle_message(); 285a295af24SAlistair Popple return IRQ_HANDLED; 28624366360SMahesh Salgaonkar } 28724366360SMahesh Salgaonkar 28824366360SMahesh Salgaonkar static int __init opal_message_init(void) 28924366360SMahesh Salgaonkar { 290a295af24SAlistair Popple int ret, i, irq; 29124366360SMahesh Salgaonkar 29224366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 29324366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 29424366360SMahesh Salgaonkar 295a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 296a295af24SAlistair Popple if (!irq) { 297a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 298a295af24SAlistair Popple __func__, irq); 299a295af24SAlistair Popple return irq; 300a295af24SAlistair Popple } 301a295af24SAlistair Popple 302a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 303a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 30424366360SMahesh Salgaonkar if (ret) { 305a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 30624366360SMahesh Salgaonkar __func__, ret); 30724366360SMahesh Salgaonkar return ret; 30824366360SMahesh Salgaonkar } 309a295af24SAlistair Popple 31024366360SMahesh Salgaonkar return 0; 31124366360SMahesh Salgaonkar } 31224366360SMahesh Salgaonkar 31314a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 31414a43e69SBenjamin Herrenschmidt { 3154f89363bSBenjamin Herrenschmidt s64 rc; 3164f89363bSBenjamin Herrenschmidt __be64 evt, len; 31714a43e69SBenjamin Herrenschmidt 31814a43e69SBenjamin Herrenschmidt if (!opal.entry) 319daea1175SBenjamin Herrenschmidt return -ENODEV; 32014a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3214f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 32214a43e69SBenjamin Herrenschmidt return 0; 3234f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 32414a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 32514a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3264f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 32714a43e69SBenjamin Herrenschmidt return 0; 32814a43e69SBenjamin Herrenschmidt } 32914a43e69SBenjamin Herrenschmidt 33014a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 33114a43e69SBenjamin Herrenschmidt { 33214a43e69SBenjamin Herrenschmidt int written = 0; 3334f89363bSBenjamin Herrenschmidt __be64 olen; 334daea1175SBenjamin Herrenschmidt s64 len, rc; 33514a43e69SBenjamin Herrenschmidt unsigned long flags; 3364f89363bSBenjamin Herrenschmidt __be64 evt; 33714a43e69SBenjamin Herrenschmidt 33814a43e69SBenjamin Herrenschmidt if (!opal.entry) 339daea1175SBenjamin Herrenschmidt return -ENODEV; 34014a43e69SBenjamin Herrenschmidt 34114a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 34214a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 343daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 344daea1175SBenjamin Herrenschmidt * 345daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 346daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 347daea1175SBenjamin Herrenschmidt * enough room and be done with it 34814a43e69SBenjamin Herrenschmidt */ 34914a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3504f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3514f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 35214a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 35314a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 35414a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 35514a43e69SBenjamin Herrenschmidt if (rc) 35614a43e69SBenjamin Herrenschmidt return total_len; 3574f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 35814a43e69SBenjamin Herrenschmidt return -EAGAIN; 35914a43e69SBenjamin Herrenschmidt } 36014a43e69SBenjamin Herrenschmidt 36114a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 36214a43e69SBenjamin Herrenschmidt * should no longer happen. 36314a43e69SBenjamin Herrenschmidt */ 364daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 36514a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 36614a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3674f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3684f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3694f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3701de1455fSBenjamin Herrenschmidt 3711de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3721de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3731de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3741de1455fSBenjamin Herrenschmidt written = total_len; 3751de1455fSBenjamin Herrenschmidt break; 3761de1455fSBenjamin Herrenschmidt } 37714a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 37814a43e69SBenjamin Herrenschmidt total_len -= len; 37914a43e69SBenjamin Herrenschmidt data += len; 38014a43e69SBenjamin Herrenschmidt written += len; 38114a43e69SBenjamin Herrenschmidt } 38214a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 38314a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 38414a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 38514a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 38614a43e69SBenjamin Herrenschmidt */ 38714a43e69SBenjamin Herrenschmidt do 38814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3894f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 3904f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 39114a43e69SBenjamin Herrenschmidt } 39214a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 39314a43e69SBenjamin Herrenschmidt return written; 39414a43e69SBenjamin Herrenschmidt } 39514a43e69SBenjamin Herrenschmidt 396b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 397b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 398b63a0ffeSMahesh Salgaonkar { 399b63a0ffeSMahesh Salgaonkar int recovered = 0; 400b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 401b63a0ffeSMahesh Salgaonkar 402b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 403b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 404b63a0ffeSMahesh Salgaonkar recovered = 0; 405b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 406b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 407b63a0ffeSMahesh Salgaonkar recovered = 1; 408b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 409b63a0ffeSMahesh Salgaonkar /* 410b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 411b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 412b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 413b63a0ffeSMahesh Salgaonkar * in userspace. 414b63a0ffeSMahesh Salgaonkar * 415b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 416b63a0ffeSMahesh Salgaonkar */ 417b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 418b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 419b63a0ffeSMahesh Salgaonkar recovered = 1; 420b63a0ffeSMahesh Salgaonkar } else 421b63a0ffeSMahesh Salgaonkar recovered = 0; 422b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 423b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 424b63a0ffeSMahesh Salgaonkar /* 425b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 426b63a0ffeSMahesh Salgaonkar * kill the task. 427b63a0ffeSMahesh Salgaonkar */ 428b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 429b63a0ffeSMahesh Salgaonkar recovered = 1; 430b63a0ffeSMahesh Salgaonkar } 431b63a0ffeSMahesh Salgaonkar return recovered; 432b63a0ffeSMahesh Salgaonkar } 433b63a0ffeSMahesh Salgaonkar 434ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 435ed79ba9eSBenjamin Herrenschmidt { 43636df96f8SMahesh Salgaonkar struct machine_check_event evt; 437e784b649SMahesh Salgaonkar int ret; 438ed79ba9eSBenjamin Herrenschmidt 43936df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 44036df96f8SMahesh Salgaonkar return 0; 441ed79ba9eSBenjamin Herrenschmidt 442ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 44336df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 444ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 445ed79ba9eSBenjamin Herrenschmidt evt.version); 446ed79ba9eSBenjamin Herrenschmidt return 0; 447ed79ba9eSBenjamin Herrenschmidt } 448b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 449ed79ba9eSBenjamin Herrenschmidt 450b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 451b63a0ffeSMahesh Salgaonkar return 1; 452e784b649SMahesh Salgaonkar 453e784b649SMahesh Salgaonkar /* 454e784b649SMahesh Salgaonkar * Unrecovered machine check, we are heading to panic path. 455e784b649SMahesh Salgaonkar * 456e784b649SMahesh Salgaonkar * We may have hit this MCE in very early stage of kernel 457e784b649SMahesh Salgaonkar * initialization even before opal-prd has started running. If 458e784b649SMahesh Salgaonkar * this is the case then this MCE error may go un-noticed or 459e784b649SMahesh Salgaonkar * un-analyzed if we go down panic path. We need to inform 460e784b649SMahesh Salgaonkar * BMC/OCC about this error so that they can collect relevant 461e784b649SMahesh Salgaonkar * data for error analysis before rebooting. 462e784b649SMahesh Salgaonkar * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 463e784b649SMahesh Salgaonkar * This function may not return on BMC based system. 464e784b649SMahesh Salgaonkar */ 465e784b649SMahesh Salgaonkar ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 466e784b649SMahesh Salgaonkar "Unrecoverable Machine Check exception"); 467e784b649SMahesh Salgaonkar if (ret == OPAL_UNSUPPORTED) { 468e784b649SMahesh Salgaonkar pr_emerg("Reboot type %d not supported\n", 469e784b649SMahesh Salgaonkar OPAL_REBOOT_PLATFORM_ERROR); 470e784b649SMahesh Salgaonkar } 471e784b649SMahesh Salgaonkar 472e784b649SMahesh Salgaonkar /* 473e784b649SMahesh Salgaonkar * We reached here. There can be three possibilities: 474e784b649SMahesh Salgaonkar * 1. We are running on a firmware level that do not support 475e784b649SMahesh Salgaonkar * opal_cec_reboot2() 476e784b649SMahesh Salgaonkar * 2. We are running on a firmware level that do not support 477e784b649SMahesh Salgaonkar * OPAL_REBOOT_PLATFORM_ERROR reboot type. 478e784b649SMahesh Salgaonkar * 3. We are running on FSP based system that does not need opal 479e784b649SMahesh Salgaonkar * to trigger checkstop explicitly for error analysis. The FSP 480e784b649SMahesh Salgaonkar * PRD component would have already got notified about this 481e784b649SMahesh Salgaonkar * error through other channels. 482e784b649SMahesh Salgaonkar * 483f2dd80ecSDaniel Axtens * If hardware marked this as an unrecoverable MCE, we are 484f2dd80ecSDaniel Axtens * going to panic anyway. Even if it didn't, it's not safe to 485f2dd80ecSDaniel Axtens * continue at this point, so we should explicitly panic. 486e784b649SMahesh Salgaonkar */ 487f2dd80ecSDaniel Axtens 488f2dd80ecSDaniel Axtens panic("PowerNV Unrecovered Machine Check"); 489b63a0ffeSMahesh Salgaonkar return 0; 490ed79ba9eSBenjamin Herrenschmidt } 491ed79ba9eSBenjamin Herrenschmidt 4920869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 4930869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 4940869b6fdSMahesh Salgaonkar { 4950ef95b41SMahesh Salgaonkar s64 rc; 4960ef95b41SMahesh Salgaonkar 4970ef95b41SMahesh Salgaonkar /* 4980ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 4990ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5000ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5010ef95b41SMahesh Salgaonkar */ 5020ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5030ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5040ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5050ef95b41SMahesh Salgaonkar return 1; 5060ef95b41SMahesh Salgaonkar } 5070869b6fdSMahesh Salgaonkar return 0; 5080869b6fdSMahesh Salgaonkar } 5090869b6fdSMahesh Salgaonkar 5100869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5110869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5120869b6fdSMahesh Salgaonkar { 5130ef95b41SMahesh Salgaonkar s64 rc; 5140ef95b41SMahesh Salgaonkar __be64 evt = 0; 5150ef95b41SMahesh Salgaonkar 5160ef95b41SMahesh Salgaonkar /* 5170ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5180ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5190ef95b41SMahesh Salgaonkar * process them. 5200ef95b41SMahesh Salgaonkar */ 5210ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5220869b6fdSMahesh Salgaonkar return 0; 5230ef95b41SMahesh Salgaonkar 5240ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5250ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 52681f2f7ceSAlistair Popple if (rc == OPAL_SUCCESS && evt) 5279f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(evt)); 5280ef95b41SMahesh Salgaonkar 5290ef95b41SMahesh Salgaonkar return 1; 5300869b6fdSMahesh Salgaonkar } 5310869b6fdSMahesh Salgaonkar 53255672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 53355672ecfSMahesh Salgaonkar { 53455672ecfSMahesh Salgaonkar int i; 53555672ecfSMahesh Salgaonkar 53655672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 53755672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 53855672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 53955672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 54055672ecfSMahesh Salgaonkar return 0; 54155672ecfSMahesh Salgaonkar } 54255672ecfSMahesh Salgaonkar 54355672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 54455672ecfSMahesh Salgaonkar { 54555672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 54655672ecfSMahesh Salgaonkar 54755672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 54855672ecfSMahesh Salgaonkar goto out; 54955672ecfSMahesh Salgaonkar 55055672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 551dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 55255672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 55355672ecfSMahesh Salgaonkar 55455672ecfSMahesh Salgaonkar /* 55555672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 55655672ecfSMahesh Salgaonkar */ 55755672ecfSMahesh Salgaonkar if (recover_addr) 55855672ecfSMahesh Salgaonkar regs->nip = recover_addr; 55955672ecfSMahesh Salgaonkar 56055672ecfSMahesh Salgaonkar out: 56155672ecfSMahesh Salgaonkar return !!recover_addr; 56255672ecfSMahesh Salgaonkar } 56355672ecfSMahesh Salgaonkar 5646f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5656f68b5e2SVasant Hegde { 5666f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5676f68b5e2SVasant Hegde if (!opal_kobj) { 5686f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5696f68b5e2SVasant Hegde return -ENOMEM; 5706f68b5e2SVasant Hegde } 5716f68b5e2SVasant Hegde 5726f68b5e2SVasant Hegde return 0; 5736f68b5e2SVasant Hegde } 5746f68b5e2SVasant Hegde 575c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 576c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 577c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 578c8742f85SBenjamin Herrenschmidt { 579c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 580c8742f85SBenjamin Herrenschmidt bin_attr->size); 581c8742f85SBenjamin Herrenschmidt } 582c8742f85SBenjamin Herrenschmidt 583c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 584c8742f85SBenjamin Herrenschmidt 585c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 586c8742f85SBenjamin Herrenschmidt { 587c8742f85SBenjamin Herrenschmidt const __be64 *syms; 588c8742f85SBenjamin Herrenschmidt unsigned int size; 589c8742f85SBenjamin Herrenschmidt struct device_node *fw; 590c8742f85SBenjamin Herrenschmidt int rc; 591c8742f85SBenjamin Herrenschmidt 592c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 593c8742f85SBenjamin Herrenschmidt if (!fw) 594c8742f85SBenjamin Herrenschmidt return; 595c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 596c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 597c8742f85SBenjamin Herrenschmidt return; 598c8742f85SBenjamin Herrenschmidt 599c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 600c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 601c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 602c8742f85SBenjamin Herrenschmidt 603c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 604c8742f85SBenjamin Herrenschmidt if (rc) 605c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 606c8742f85SBenjamin Herrenschmidt } 607c8742f85SBenjamin Herrenschmidt 608b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 609b09c2ec4SVasant Hegde { 610b09c2ec4SVasant Hegde void *addr; 611b09c2ec4SVasant Hegde uint64_t size; 612b09c2ec4SVasant Hegde int rc; 613b09c2ec4SVasant Hegde 614b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 615b962f5a4SStewart Smith return; 616b962f5a4SStewart Smith 617b09c2ec4SVasant Hegde /* Register kernel log buffer */ 618b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 6196501ab5eSPranith Kumar if (addr == NULL) 6206501ab5eSPranith Kumar return; 6216501ab5eSPranith Kumar 622b09c2ec4SVasant Hegde size = log_buf_len_get(); 6236501ab5eSPranith Kumar if (size == 0) 6246501ab5eSPranith Kumar return; 6256501ab5eSPranith Kumar 626b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 627b09c2ec4SVasant Hegde __pa(addr), size); 628b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 629b09c2ec4SVasant Hegde * know about that call 630b09c2ec4SVasant Hegde */ 631b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 632b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 633b09c2ec4SVasant Hegde "rc = %d\n", rc); 634b09c2ec4SVasant Hegde } 635608b286dSJeremy Kerr 63648c06154SJeremy Kerr static void opal_pdev_init(struct device_node *opal_node, 63748c06154SJeremy Kerr const char *compatible) 638ed59190eSCyril Bur { 639ed59190eSCyril Bur struct device_node *np; 640ed59190eSCyril Bur 641ed59190eSCyril Bur for_each_child_of_node(opal_node, np) 64248c06154SJeremy Kerr if (of_device_is_compatible(np, compatible)) 643608b286dSJeremy Kerr of_platform_device_create(np, NULL, NULL); 644608b286dSJeremy Kerr } 645608b286dSJeremy Kerr 64647083450SNeelesh Gupta static void opal_i2c_create_devs(void) 64747083450SNeelesh Gupta { 64847083450SNeelesh Gupta struct device_node *np; 64947083450SNeelesh Gupta 65047083450SNeelesh Gupta for_each_compatible_node(np, NULL, "ibm,opal-i2c") 65147083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 65247083450SNeelesh Gupta } 65347083450SNeelesh Gupta 6543bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 6553bf57561SBenjamin Herrenschmidt { 6569f0fd049SAlistair Popple __be64 events; 6579f0fd049SAlistair Popple 6583bf57561SBenjamin Herrenschmidt set_freezable(); 6593bf57561SBenjamin Herrenschmidt do { 6603bf57561SBenjamin Herrenschmidt try_to_freeze(); 6619f0fd049SAlistair Popple opal_poll_events(&events); 6629f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(events)); 6633bf57561SBenjamin Herrenschmidt msleep_interruptible(opal_heartbeat); 6643bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 6653bf57561SBenjamin Herrenschmidt 6663bf57561SBenjamin Herrenschmidt return 0; 6673bf57561SBenjamin Herrenschmidt } 6683bf57561SBenjamin Herrenschmidt 6693bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 6703bf57561SBenjamin Herrenschmidt { 6713bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 6723bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 6733bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 6743bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 6753bf57561SBenjamin Herrenschmidt 6763bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 6773bf57561SBenjamin Herrenschmidt kthread_run(kopald, NULL, "kopald"); 6783bf57561SBenjamin Herrenschmidt } 6793bf57561SBenjamin Herrenschmidt 68014a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 68114a43e69SBenjamin Herrenschmidt { 682c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 683c1c3a526SGavin Shan int rc; 68414a43e69SBenjamin Herrenschmidt 68514a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 68614a43e69SBenjamin Herrenschmidt if (!opal_node) { 68708135139SMichael Ellerman pr_warn("Device node not found\n"); 68814a43e69SBenjamin Herrenschmidt return -ENODEV; 68914a43e69SBenjamin Herrenschmidt } 6902db29d28SBenjamin Herrenschmidt 6912db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 69214a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 6932db29d28SBenjamin Herrenschmidt if (consoles) { 69414a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 69514a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 69614a43e69SBenjamin Herrenschmidt continue; 69714a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 69814a43e69SBenjamin Herrenschmidt } 69914a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7002db29d28SBenjamin Herrenschmidt } 701a125e092SBenjamin Herrenschmidt 70296e023e7SAlistair Popple /* Initialise OPAL messaging system */ 70396e023e7SAlistair Popple opal_message_init(); 70496e023e7SAlistair Popple 70596e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 70696e023e7SAlistair Popple opal_async_comp_init(); 70796e023e7SAlistair Popple 70896e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 70996e023e7SAlistair Popple opal_sensor_init(); 71096e023e7SAlistair Popple 71196e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 71296e023e7SAlistair Popple opal_hmi_handler_init(); 71396e023e7SAlistair Popple 71447083450SNeelesh Gupta /* Create i2c platform devices */ 71547083450SNeelesh Gupta opal_i2c_create_devs(); 71647083450SNeelesh Gupta 7173bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 7183bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 7193bf57561SBenjamin Herrenschmidt 720c159b596SVasant Hegde /* Create leds platform devices */ 721c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 722c159b596SVasant Hegde if (leds) { 723c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 724c159b596SVasant Hegde of_node_put(leds); 725c159b596SVasant Hegde } 726c159b596SVasant Hegde 7279b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 7289b4fffa1SAndrew Donnellan opal_msglog_init(); 7299b4fffa1SAndrew Donnellan 7306f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 7316f68b5e2SVasant Hegde rc = opal_sysfs_init(); 73250bd6153SVasant Hegde if (rc == 0) { 733c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 734c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 735b09c2ec4SVasant Hegde /* Setup dump region interface */ 736b09c2ec4SVasant Hegde opal_dump_region_init(); 737774fea1aSStewart Smith /* Setup error log interface */ 738774fea1aSStewart Smith rc = opal_elog_init(); 73950bd6153SVasant Hegde /* Setup code update interface */ 740ed59190eSCyril Bur opal_flash_update_init(); 741c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 742c7e64b9cSStewart Smith opal_platform_dump_init(); 7434029cd66SNeelesh Gupta /* Setup system parameters interface */ 7444029cd66SNeelesh Gupta opal_sys_param_init(); 7459b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 7469b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 74750bd6153SVasant Hegde } 7486f68b5e2SVasant Hegde 7490d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 75048c06154SJeremy Kerr opal_pdev_init(opal_node, "ibm,opal-ipmi"); 75148c06154SJeremy Kerr opal_pdev_init(opal_node, "ibm,opal-flash"); 7520d7cd855SJeremy Kerr opal_pdev_init(opal_node, "ibm,opal-prd"); 753ed59190eSCyril Bur 754affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 755affddff6SRussell Currey opal_kmsg_init(); 756affddff6SRussell Currey 75714a43e69SBenjamin Herrenschmidt return 0; 75814a43e69SBenjamin Herrenschmidt } 759b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 76073ed148aSBenjamin Herrenschmidt 76173ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 76273ed148aSBenjamin Herrenschmidt { 763f7d98d18SVasant Hegde long rc = OPAL_BUSY; 76473ed148aSBenjamin Herrenschmidt 7659f0fd049SAlistair Popple opal_event_shutdown(); 766f7d98d18SVasant Hegde 767f7d98d18SVasant Hegde /* 768f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 769f7d98d18SVasant Hegde * potentially write to our memory has completed such 770f7d98d18SVasant Hegde * as an ongoing dump retrieval 771f7d98d18SVasant Hegde */ 772f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 773f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 774f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 775f7d98d18SVasant Hegde opal_poll_events(NULL); 776f7d98d18SVasant Hegde else 777f7d98d18SVasant Hegde mdelay(10); 778f7d98d18SVasant Hegde } 779b09c2ec4SVasant Hegde 780b09c2ec4SVasant Hegde /* Unregister memory dump region */ 781b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 782b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 78373ed148aSBenjamin Herrenschmidt } 784e28b05e7SJoel Stanley 785e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 786e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 787594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 788594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 789608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 790608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 791ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 792ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 793ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 7940d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 7953441f04bSAnton Blanchard 7963441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 7973441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 7983441f04bSAnton Blanchard unsigned long vmalloc_size) 7993441f04bSAnton Blanchard { 8003441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 8013441f04bSAnton Blanchard unsigned long i = 0; 8023441f04bSAnton Blanchard 8033441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 8043441f04bSAnton Blanchard if (!sg) 8053441f04bSAnton Blanchard goto nomem; 8063441f04bSAnton Blanchard 8073441f04bSAnton Blanchard first = sg; 8083441f04bSAnton Blanchard 8093441f04bSAnton Blanchard while (vmalloc_size > 0) { 8103441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 8113441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 8123441f04bSAnton Blanchard 8133441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 8143441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 8153441f04bSAnton Blanchard i++; 8163441f04bSAnton Blanchard 8173441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 8183441f04bSAnton Blanchard struct opal_sg_list *next; 8193441f04bSAnton Blanchard 8203441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 8213441f04bSAnton Blanchard if (!next) 8223441f04bSAnton Blanchard goto nomem; 8233441f04bSAnton Blanchard 8243441f04bSAnton Blanchard sg->length = cpu_to_be64( 8253441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 8263441f04bSAnton Blanchard i = 0; 8273441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 8283441f04bSAnton Blanchard sg = next; 8293441f04bSAnton Blanchard } 8303441f04bSAnton Blanchard 8313441f04bSAnton Blanchard vmalloc_addr += length; 8323441f04bSAnton Blanchard vmalloc_size -= length; 8333441f04bSAnton Blanchard } 8343441f04bSAnton Blanchard 8353441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 8363441f04bSAnton Blanchard 8373441f04bSAnton Blanchard return first; 8383441f04bSAnton Blanchard 8393441f04bSAnton Blanchard nomem: 8403441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 8413441f04bSAnton Blanchard opal_free_sg_list(first); 8423441f04bSAnton Blanchard return NULL; 8433441f04bSAnton Blanchard } 8443441f04bSAnton Blanchard 8453441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 8463441f04bSAnton Blanchard { 8473441f04bSAnton Blanchard while (sg) { 8483441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 8493441f04bSAnton Blanchard 8503441f04bSAnton Blanchard kfree(sg); 8513441f04bSAnton Blanchard 8523441f04bSAnton Blanchard if (next) 8533441f04bSAnton Blanchard sg = __va(next); 8543441f04bSAnton Blanchard else 8553441f04bSAnton Blanchard sg = NULL; 8563441f04bSAnton Blanchard } 8573441f04bSAnton Blanchard } 85816b1d26eSNeelesh Gupta 859e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 860e3c5c2e0SCédric Le Goater { 861e3c5c2e0SCédric Le Goater switch (rc) { 862e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 863e3c5c2e0SCédric Le Goater 864e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 865e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 866e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 867e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 86814aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 869e3c5c2e0SCédric Le Goater 870e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 871e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 872e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 873e3c5c2e0SCédric Le Goater default: 874e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 875e3c5c2e0SCédric Le Goater return -EIO; 876e3c5c2e0SCédric Le Goater } 877e3c5c2e0SCédric Le Goater } 878e3c5c2e0SCédric Le Goater 87916b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 88016b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 88116b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 88216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 88316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 88447083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 885c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 886c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 887c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 888