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/kmsg_dump.h> 30b746e3e0SNicholas Piggin #include <linux/console.h> 31b746e3e0SNicholas Piggin #include <linux/sched/debug.h> 32b14726c5SMichael Ellerman 33b14726c5SMichael Ellerman #include <asm/machdep.h> 3414a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 3514a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3636df96f8SMahesh Salgaonkar #include <asm/mce.h> 378f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 386fcd6baaSNicholas Piggin #include <asm/bug.h> 3914a43e69SBenjamin Herrenschmidt 4014a43e69SBenjamin Herrenschmidt #include "powernv.h" 4114a43e69SBenjamin Herrenschmidt 426f68b5e2SVasant Hegde /* /sys/firmware/opal */ 436f68b5e2SVasant Hegde struct kobject *opal_kobj; 446f68b5e2SVasant Hegde 4514a43e69SBenjamin Herrenschmidt struct opal { 4614a43e69SBenjamin Herrenschmidt u64 base; 4714a43e69SBenjamin Herrenschmidt u64 entry; 4855672ecfSMahesh Salgaonkar u64 size; 4914a43e69SBenjamin Herrenschmidt } opal; 5014a43e69SBenjamin Herrenschmidt 5155672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 5255672ecfSMahesh Salgaonkar u64 start_addr; 5355672ecfSMahesh Salgaonkar u64 end_addr; 5455672ecfSMahesh Salgaonkar u64 recover_addr; 5555672ecfSMahesh Salgaonkar }; 5655672ecfSMahesh Salgaonkar 5755672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5855672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5955672ecfSMahesh Salgaonkar 60bfc36894SJoel Stanley struct device_node *opal_node; 6114a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 6224366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 633bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 64a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 6514a43e69SBenjamin Herrenschmidt 66d3cbff1bSBenjamin Herrenschmidt void opal_configure_cores(void) 674926616cSBenjamin Herrenschmidt { 681c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 691c0eaf0fSBenjamin Herrenschmidt 704926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 714926616cSBenjamin Herrenschmidt * 724926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 734926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 744926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 754926616cSBenjamin Herrenschmidt */ 764926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 771c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 784926616cSBenjamin Herrenschmidt #else 791c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 804926616cSBenjamin Herrenschmidt #endif 81d3cbff1bSBenjamin Herrenschmidt 821c0eaf0fSBenjamin Herrenschmidt /* 831c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 841c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 851c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 861c0eaf0fSBenjamin Herrenschmidt */ 87a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 881c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 891c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 901c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 911c0eaf0fSBenjamin Herrenschmidt } 921c0eaf0fSBenjamin Herrenschmidt 931c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 941c0eaf0fSBenjamin Herrenschmidt 95d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 96d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 97d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 984926616cSBenjamin Herrenschmidt } 994926616cSBenjamin Herrenschmidt 10014a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 10114a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 10214a43e69SBenjamin Herrenschmidt { 10355672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 1049d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 10514a43e69SBenjamin Herrenschmidt 10614a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10714a43e69SBenjamin Herrenschmidt return 0; 10814a43e69SBenjamin Herrenschmidt 10914a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 11014a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 11155672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 11214a43e69SBenjamin Herrenschmidt 11355672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 11414a43e69SBenjamin Herrenschmidt return 1; 11514a43e69SBenjamin Herrenschmidt 11614a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 11714a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 11855672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 11914a43e69SBenjamin Herrenschmidt 1209d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 12114a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1229d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 12314a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1249d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 12555672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 12614a43e69SBenjamin Herrenschmidt 12775b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 128e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 1295138b314SBenjamin Herrenschmidt pr_debug("OPAL detected !\n"); 13014a43e69SBenjamin Herrenschmidt } else { 131786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 13214a43e69SBenjamin Herrenschmidt } 13314a43e69SBenjamin Herrenschmidt 134c4463b37SJeremy Kerr return 1; 135c4463b37SJeremy Kerr } 136c4463b37SJeremy Kerr 13755672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13855672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 13955672ecfSMahesh Salgaonkar { 1409d0c4dfeSRob Herring int i, psize, size; 14155672ecfSMahesh Salgaonkar const __be32 *prop; 14255672ecfSMahesh Salgaonkar 14355672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 14455672ecfSMahesh Salgaonkar return 0; 14555672ecfSMahesh Salgaonkar 1466e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 14755672ecfSMahesh Salgaonkar 14855672ecfSMahesh Salgaonkar if (!prop) 14955672ecfSMahesh Salgaonkar return 1; 15055672ecfSMahesh Salgaonkar 15155672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 15255672ecfSMahesh Salgaonkar 15355672ecfSMahesh Salgaonkar /* 1546e556b47SMahesh Salgaonkar * Calculate number of available entries. 1556e556b47SMahesh Salgaonkar * 1566e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1576e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1586e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1596e556b47SMahesh Salgaonkar */ 1606e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1616e556b47SMahesh Salgaonkar 1626e556b47SMahesh Salgaonkar /* Sanity check */ 1636e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1646e556b47SMahesh Salgaonkar return 1; 1656e556b47SMahesh Salgaonkar 1666e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1676e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1686e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1696e556b47SMahesh Salgaonkar 1706e556b47SMahesh Salgaonkar /* 17176b42e28SNicholas Piggin * Allocate a buffer to hold the MC recoverable ranges. 17255672ecfSMahesh Salgaonkar */ 173b63a07d6SMike Rapoport mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); 1748a7f97b9SMike Rapoport if (!mc_recoverable_range) 1758a7f97b9SMike Rapoport panic("%s: Failed to allocate %u bytes align=0x%lx\n", 1768a7f97b9SMike Rapoport __func__, size, __alignof__(u64)); 17755672ecfSMahesh Salgaonkar 1786e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17955672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 18055672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 18155672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 18255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 18355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 18455672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 18555672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 18655672ecfSMahesh Salgaonkar 18755672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18855672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18955672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 19055672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 19155672ecfSMahesh Salgaonkar } 19255672ecfSMahesh Salgaonkar return 1; 19355672ecfSMahesh Salgaonkar } 19455672ecfSMahesh Salgaonkar 195c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 196c4463b37SJeremy Kerr { 19729186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 198c4463b37SJeremy Kerr u64 glue; 199c4463b37SJeremy Kerr 200c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 201c4463b37SJeremy Kerr return -ENODEV; 202c4463b37SJeremy Kerr 20328446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 20428446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 205ed79ba9eSBenjamin Herrenschmidt */ 206ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2076507955cSMahesh Salgaonkar 2086507955cSMahesh Salgaonkar /* 2091549c42dSStewart Smith * Only ancient OPAL firmware requires this. 2101549c42dSStewart Smith * Specifically, firmware from FW810.00 (released June 2014) 2111549c42dSStewart Smith * through FW810.20 (Released October 2014). 2126507955cSMahesh Salgaonkar * 2131549c42dSStewart Smith * Check if we are running on newer (post Oct 2014) firmware that 2141549c42dSStewart Smith * exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to 2151549c42dSStewart Smith * patch the HMI interrupt and we catch it directly in Linux. 2166507955cSMahesh Salgaonkar * 2171549c42dSStewart Smith * For older firmware (i.e < FW810.20), we fallback to old behavior and 2181549c42dSStewart Smith * let OPAL patch the HMI vector and handle it inside OPAL firmware. 2191549c42dSStewart Smith * 2201549c42dSStewart Smith * For newer firmware we catch/handle the HMI directly in Linux. 2216507955cSMahesh Salgaonkar */ 2226507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 22308135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2246507955cSMahesh Salgaonkar opal_register_exception_handler( 2256507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2266507955cSMahesh Salgaonkar 0, glue); 2276507955cSMahesh Salgaonkar glue += 128; 2286507955cSMahesh Salgaonkar } 2296507955cSMahesh Salgaonkar 2301549c42dSStewart Smith /* 2311549c42dSStewart Smith * Only applicable to ancient firmware, all modern 2321549c42dSStewart Smith * (post March 2015/skiboot 5.0) firmware will just return 2331549c42dSStewart Smith * OPAL_UNSUPPORTED. 2341549c42dSStewart Smith */ 235ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 23629186097SBenjamin Herrenschmidt #endif 237ed79ba9eSBenjamin Herrenschmidt 238c4463b37SJeremy Kerr return 0; 23914a43e69SBenjamin Herrenschmidt } 240b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 241c4463b37SJeremy Kerr 24224366360SMahesh Salgaonkar /* 24324366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 24424366360SMahesh Salgaonkar * notified for specific messgae type. 24524366360SMahesh Salgaonkar */ 246d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 24724366360SMahesh Salgaonkar struct notifier_block *nb) 24824366360SMahesh Salgaonkar { 249792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 250f2c2cbccSJoe Perches pr_warn("%s: Invalid arguments, msg_type:%d\n", 25124366360SMahesh Salgaonkar __func__, msg_type); 25224366360SMahesh Salgaonkar return -EINVAL; 25324366360SMahesh Salgaonkar } 254792f96e9SNeelesh Gupta 25524366360SMahesh Salgaonkar return atomic_notifier_chain_register( 25624366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 25724366360SMahesh Salgaonkar } 258594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 25924366360SMahesh Salgaonkar 260df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 261b921e902SNeelesh Gupta struct notifier_block *nb) 262b921e902SNeelesh Gupta { 263b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 264b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 265b921e902SNeelesh Gupta } 266594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 267b921e902SNeelesh Gupta 26824366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 26924366360SMahesh Salgaonkar { 27024366360SMahesh Salgaonkar /* notify subscribers */ 27124366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 27224366360SMahesh Salgaonkar msg_type, msg); 27324366360SMahesh Salgaonkar } 27424366360SMahesh Salgaonkar 27524366360SMahesh Salgaonkar static void opal_handle_message(void) 27624366360SMahesh Salgaonkar { 27724366360SMahesh Salgaonkar s64 ret; 27824366360SMahesh Salgaonkar /* 27924366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 28024366360SMahesh Salgaonkar * value in /proc/device-tree. 28124366360SMahesh Salgaonkar */ 28224366360SMahesh Salgaonkar static struct opal_msg msg; 283bb4398e1SAnton Blanchard u32 type; 28424366360SMahesh Salgaonkar 28524366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 28624366360SMahesh Salgaonkar /* No opal message pending. */ 28724366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 28824366360SMahesh Salgaonkar return; 28924366360SMahesh Salgaonkar 29024366360SMahesh Salgaonkar /* check for errors. */ 29124366360SMahesh Salgaonkar if (ret) { 292f2c2cbccSJoe Perches pr_warn("%s: Failed to retrieve opal message, err=%lld\n", 29324366360SMahesh Salgaonkar __func__, ret); 29424366360SMahesh Salgaonkar return; 29524366360SMahesh Salgaonkar } 29624366360SMahesh Salgaonkar 297bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 298bb4398e1SAnton Blanchard 29924366360SMahesh Salgaonkar /* Sanity check */ 300792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 30198da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 30224366360SMahesh Salgaonkar return; 30324366360SMahesh Salgaonkar } 304bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 30524366360SMahesh Salgaonkar } 30624366360SMahesh Salgaonkar 307a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 30824366360SMahesh Salgaonkar { 30924366360SMahesh Salgaonkar opal_handle_message(); 310a295af24SAlistair Popple return IRQ_HANDLED; 31124366360SMahesh Salgaonkar } 31224366360SMahesh Salgaonkar 31324366360SMahesh Salgaonkar static int __init opal_message_init(void) 31424366360SMahesh Salgaonkar { 315a295af24SAlistair Popple int ret, i, irq; 31624366360SMahesh Salgaonkar 31724366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 31824366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 31924366360SMahesh Salgaonkar 320a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 321a295af24SAlistair Popple if (!irq) { 322a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 323a295af24SAlistair Popple __func__, irq); 324a295af24SAlistair Popple return irq; 325a295af24SAlistair Popple } 326a295af24SAlistair Popple 327a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 328a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 32924366360SMahesh Salgaonkar if (ret) { 330a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 33124366360SMahesh Salgaonkar __func__, ret); 33224366360SMahesh Salgaonkar return ret; 33324366360SMahesh Salgaonkar } 334a295af24SAlistair Popple 33524366360SMahesh Salgaonkar return 0; 33624366360SMahesh Salgaonkar } 33724366360SMahesh Salgaonkar 33814a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 33914a43e69SBenjamin Herrenschmidt { 3404f89363bSBenjamin Herrenschmidt s64 rc; 3414f89363bSBenjamin Herrenschmidt __be64 evt, len; 34214a43e69SBenjamin Herrenschmidt 34314a43e69SBenjamin Herrenschmidt if (!opal.entry) 344daea1175SBenjamin Herrenschmidt return -ENODEV; 34514a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3464f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 34714a43e69SBenjamin Herrenschmidt return 0; 3484f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 34914a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 35014a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3514f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 35214a43e69SBenjamin Herrenschmidt return 0; 35314a43e69SBenjamin Herrenschmidt } 35414a43e69SBenjamin Herrenschmidt 35517cc1dd4SNicholas Piggin static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) 35614a43e69SBenjamin Herrenschmidt { 35717cc1dd4SNicholas Piggin unsigned long flags = 0 /* shut up gcc */; 358b74d2807SNicholas Piggin int written; 359b74d2807SNicholas Piggin __be64 olen; 360b74d2807SNicholas Piggin s64 rc; 36114a43e69SBenjamin Herrenschmidt 36214a43e69SBenjamin Herrenschmidt if (!opal.entry) 363daea1175SBenjamin Herrenschmidt return -ENODEV; 36414a43e69SBenjamin Herrenschmidt 36517cc1dd4SNicholas Piggin if (atomic) 36614a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3674f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 368b74d2807SNicholas Piggin if (rc || be64_to_cpu(olen) < total_len) { 36914a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 37014a43e69SBenjamin Herrenschmidt if (rc) 371b74d2807SNicholas Piggin written = total_len; 372b74d2807SNicholas Piggin else 373b74d2807SNicholas Piggin written = -EAGAIN; 374b74d2807SNicholas Piggin goto out; 37514a43e69SBenjamin Herrenschmidt } 37614a43e69SBenjamin Herrenschmidt 377b74d2807SNicholas Piggin /* Should not get a partial write here because space is available. */ 3784f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3794f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 380b74d2807SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 38195b861a7SNicholas Piggin if (rc == OPAL_BUSY_EVENT) 38236d2dabcSNicholas Piggin opal_poll_events(NULL); 383b74d2807SNicholas Piggin written = -EAGAIN; 384b74d2807SNicholas Piggin goto out; 38536d2dabcSNicholas Piggin } 38636d2dabcSNicholas Piggin 3871de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 38836d2dabcSNicholas Piggin if (rc != OPAL_SUCCESS) { 389b74d2807SNicholas Piggin written = opal_error_code(rc); 390b74d2807SNicholas Piggin goto out; 3911de1455fSBenjamin Herrenschmidt } 39236d2dabcSNicholas Piggin 393b74d2807SNicholas Piggin written = be64_to_cpu(olen); 394b74d2807SNicholas Piggin if (written < total_len) { 39517cc1dd4SNicholas Piggin if (atomic) { 396b74d2807SNicholas Piggin /* Should not happen */ 39717cc1dd4SNicholas Piggin pr_warn("atomic console write returned partial " 39817cc1dd4SNicholas Piggin "len=%d written=%d\n", total_len, written); 39917cc1dd4SNicholas Piggin } 400b74d2807SNicholas Piggin if (!written) 401b74d2807SNicholas Piggin written = -EAGAIN; 402b74d2807SNicholas Piggin } 403b74d2807SNicholas Piggin 404b74d2807SNicholas Piggin out: 40517cc1dd4SNicholas Piggin if (atomic) 406b74d2807SNicholas Piggin spin_unlock_irqrestore(&opal_write_lock, flags); 40736d2dabcSNicholas Piggin 408d2a2262eSNicholas Piggin return written; 409d2a2262eSNicholas Piggin } 410d2a2262eSNicholas Piggin 41117cc1dd4SNicholas Piggin int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 41217cc1dd4SNicholas Piggin { 41317cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, false); 41417cc1dd4SNicholas Piggin } 41517cc1dd4SNicholas Piggin 41617cc1dd4SNicholas Piggin /* 41717cc1dd4SNicholas Piggin * opal_put_chars_atomic will not perform partial-writes. Data will be 41817cc1dd4SNicholas Piggin * atomically written to the terminal or not at all. This is not strictly 41917cc1dd4SNicholas Piggin * true at the moment because console space can race with OPAL's console 42017cc1dd4SNicholas Piggin * writes. 42117cc1dd4SNicholas Piggin */ 42217cc1dd4SNicholas Piggin int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) 42317cc1dd4SNicholas Piggin { 42417cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, true); 42517cc1dd4SNicholas Piggin } 42617cc1dd4SNicholas Piggin 42795b861a7SNicholas Piggin static s64 __opal_flush_console(uint32_t vtermno) 428d2a2262eSNicholas Piggin { 429d2a2262eSNicholas Piggin s64 rc; 430d2a2262eSNicholas Piggin 431d2a2262eSNicholas Piggin if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { 432d2a2262eSNicholas Piggin __be64 evt; 433d2a2262eSNicholas Piggin 434d2a2262eSNicholas Piggin /* 435d2a2262eSNicholas Piggin * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, 436d2a2262eSNicholas Piggin * the console can still be flushed by calling the polling 437d2a2262eSNicholas Piggin * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. 438d2a2262eSNicholas Piggin */ 43995b861a7SNicholas Piggin WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); 44095b861a7SNicholas Piggin 44114a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 44295b861a7SNicholas Piggin if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) 443d2a2262eSNicholas Piggin return OPAL_SUCCESS; 44495b861a7SNicholas Piggin return OPAL_BUSY; 445d2a2262eSNicholas Piggin 44695b861a7SNicholas Piggin } else { 447d2a2262eSNicholas Piggin rc = opal_console_flush(vtermno); 448d2a2262eSNicholas Piggin if (rc == OPAL_BUSY_EVENT) { 449d2a2262eSNicholas Piggin opal_poll_events(NULL); 45095b861a7SNicholas Piggin rc = OPAL_BUSY; 451d2a2262eSNicholas Piggin } 45295b861a7SNicholas Piggin return rc; 453d2a2262eSNicholas Piggin } 45495b861a7SNicholas Piggin 45595b861a7SNicholas Piggin } 45695b861a7SNicholas Piggin 45795b861a7SNicholas Piggin /* 45895b861a7SNicholas Piggin * opal_flush_console spins until the console is flushed 45995b861a7SNicholas Piggin */ 46095b861a7SNicholas Piggin int opal_flush_console(uint32_t vtermno) 46195b861a7SNicholas Piggin { 46295b861a7SNicholas Piggin for (;;) { 46395b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 46495b861a7SNicholas Piggin 46595b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 46695b861a7SNicholas Piggin mdelay(1); 46795b861a7SNicholas Piggin continue; 46895b861a7SNicholas Piggin } 469d2a2262eSNicholas Piggin 470d2a2262eSNicholas Piggin return opal_error_code(rc); 47114a43e69SBenjamin Herrenschmidt } 47295b861a7SNicholas Piggin } 47395b861a7SNicholas Piggin 47495b861a7SNicholas Piggin /* 47595b861a7SNicholas Piggin * opal_flush_chars is an hvc interface that sleeps until the console is 47695b861a7SNicholas Piggin * flushed if wait, otherwise it will return -EBUSY if the console has data, 47795b861a7SNicholas Piggin * -EAGAIN if it has data and some of it was flushed. 47895b861a7SNicholas Piggin */ 47995b861a7SNicholas Piggin int opal_flush_chars(uint32_t vtermno, bool wait) 48095b861a7SNicholas Piggin { 48195b861a7SNicholas Piggin for (;;) { 48295b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 48395b861a7SNicholas Piggin 48495b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 48595b861a7SNicholas Piggin if (wait) { 48695b861a7SNicholas Piggin msleep(OPAL_BUSY_DELAY_MS); 48795b861a7SNicholas Piggin continue; 48895b861a7SNicholas Piggin } 48995b861a7SNicholas Piggin if (rc == OPAL_PARTIAL) 49095b861a7SNicholas Piggin return -EAGAIN; 49195b861a7SNicholas Piggin } 49295b861a7SNicholas Piggin 49395b861a7SNicholas Piggin return opal_error_code(rc); 49495b861a7SNicholas Piggin } 49595b861a7SNicholas Piggin } 49614a43e69SBenjamin Herrenschmidt 497b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 498b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 499b63a0ffeSMahesh Salgaonkar { 500b63a0ffeSMahesh Salgaonkar int recovered = 0; 501b63a0ffeSMahesh Salgaonkar 502b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 503b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 504c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 505b63a0ffeSMahesh Salgaonkar recovered = 0; 506b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 507b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 508b63a0ffeSMahesh Salgaonkar recovered = 1; 5091363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 5101363875bSNicholas Piggin /* Fatal machine check */ 5111363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 5121363875bSNicholas Piggin recovered = 0; 5136fcd6baaSNicholas Piggin } 5146fcd6baaSNicholas Piggin 515cda6618dSMahesh Salgaonkar if (!recovered && evt->sync_error) { 516b63a0ffeSMahesh Salgaonkar /* 5176fcd6baaSNicholas Piggin * Try to kill processes if we get a synchronous machine check 5186fcd6baaSNicholas Piggin * (e.g., one caused by execution of this instruction). This 5196fcd6baaSNicholas Piggin * will devolve into a panic if we try to kill init or are in 5206fcd6baaSNicholas Piggin * an interrupt etc. 521b63a0ffeSMahesh Salgaonkar * 522b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 5236fcd6baaSNicholas Piggin * TODO: This is not quite right for d-side machine 5246fcd6baaSNicholas Piggin * checks ->nip is not necessarily the important 5256fcd6baaSNicholas Piggin * address. 526b63a0ffeSMahesh Salgaonkar */ 5276fcd6baaSNicholas Piggin if ((user_mode(regs))) { 528b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 529b63a0ffeSMahesh Salgaonkar recovered = 1; 5306fcd6baaSNicholas Piggin } else if (die_will_crash()) { 5316fcd6baaSNicholas Piggin /* 5326fcd6baaSNicholas Piggin * die() would kill the kernel, so better to go via 5336fcd6baaSNicholas Piggin * the platform reboot code that will log the 5346fcd6baaSNicholas Piggin * machine check. 5356fcd6baaSNicholas Piggin */ 5366fcd6baaSNicholas Piggin recovered = 0; 5376fcd6baaSNicholas Piggin } else { 5386fcd6baaSNicholas Piggin die("Machine check", regs, SIGBUS); 5396fcd6baaSNicholas Piggin recovered = 1; 540b63a0ffeSMahesh Salgaonkar } 5416fcd6baaSNicholas Piggin } 5426fcd6baaSNicholas Piggin 543b63a0ffeSMahesh Salgaonkar return recovered; 544b63a0ffeSMahesh Salgaonkar } 545b63a0ffeSMahesh Salgaonkar 54662dea077SBreno Leitao void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 547b746e3e0SNicholas Piggin { 54835adacd6SNicholas Piggin panic_flush_kmsg_start(); 54935adacd6SNicholas Piggin 550b746e3e0SNicholas Piggin pr_emerg("Hardware platform error: %s\n", msg); 551b746e3e0SNicholas Piggin if (regs) 552b746e3e0SNicholas Piggin show_regs(regs); 553b746e3e0SNicholas Piggin smp_send_stop(); 55435adacd6SNicholas Piggin 55535adacd6SNicholas Piggin panic_flush_kmsg_end(); 556b746e3e0SNicholas Piggin 557b746e3e0SNicholas Piggin /* 558b746e3e0SNicholas Piggin * Don't bother to shut things down because this will 559b746e3e0SNicholas Piggin * xstop the system. 560b746e3e0SNicholas Piggin */ 561b746e3e0SNicholas Piggin if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 562b746e3e0SNicholas Piggin == OPAL_UNSUPPORTED) { 563b746e3e0SNicholas Piggin pr_emerg("Reboot type %d not supported for %s\n", 564b746e3e0SNicholas Piggin OPAL_REBOOT_PLATFORM_ERROR, msg); 565b746e3e0SNicholas Piggin } 566b746e3e0SNicholas Piggin 567b746e3e0SNicholas Piggin /* 568b746e3e0SNicholas Piggin * We reached here. There can be three possibilities: 569b746e3e0SNicholas Piggin * 1. We are running on a firmware level that do not support 570b746e3e0SNicholas Piggin * opal_cec_reboot2() 571b746e3e0SNicholas Piggin * 2. We are running on a firmware level that do not support 572b746e3e0SNicholas Piggin * OPAL_REBOOT_PLATFORM_ERROR reboot type. 573b746e3e0SNicholas Piggin * 3. We are running on FSP based system that does not need 574b746e3e0SNicholas Piggin * opal to trigger checkstop explicitly for error analysis. 575b746e3e0SNicholas Piggin * The FSP PRD component would have already got notified 576b746e3e0SNicholas Piggin * about this error through other channels. 5775ee573e8SBalbir Singh * 4. We are running on a newer skiboot that by default does 5785ee573e8SBalbir Singh * not cause a checkstop, drops us back to the kernel to 5795ee573e8SBalbir Singh * extract context and state at the time of the error. 580b746e3e0SNicholas Piggin */ 581b746e3e0SNicholas Piggin 5825ee573e8SBalbir Singh panic(msg); 583b746e3e0SNicholas Piggin } 584b746e3e0SNicholas Piggin 585ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 586ed79ba9eSBenjamin Herrenschmidt { 58736df96f8SMahesh Salgaonkar struct machine_check_event evt; 588ed79ba9eSBenjamin Herrenschmidt 58936df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 59036df96f8SMahesh Salgaonkar return 0; 591ed79ba9eSBenjamin Herrenschmidt 592ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 59336df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 594ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 595ed79ba9eSBenjamin Herrenschmidt evt.version); 596ed79ba9eSBenjamin Herrenschmidt return 0; 597ed79ba9eSBenjamin Herrenschmidt } 598c0577201SPaul Mackerras machine_check_print_event_info(&evt, user_mode(regs), false); 599ed79ba9eSBenjamin Herrenschmidt 600b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 601b63a0ffeSMahesh Salgaonkar return 1; 602e784b649SMahesh Salgaonkar 603b746e3e0SNicholas Piggin pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 604ed79ba9eSBenjamin Herrenschmidt } 605ed79ba9eSBenjamin Herrenschmidt 6060869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 6070869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 6080869b6fdSMahesh Salgaonkar { 6090ef95b41SMahesh Salgaonkar s64 rc; 6100ef95b41SMahesh Salgaonkar 6110ef95b41SMahesh Salgaonkar /* 6120ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 6130ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 6140ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 6150ef95b41SMahesh Salgaonkar */ 6160ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 6170ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 6180ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 6190ef95b41SMahesh Salgaonkar return 1; 6200ef95b41SMahesh Salgaonkar } 6210869b6fdSMahesh Salgaonkar return 0; 6220869b6fdSMahesh Salgaonkar } 6230869b6fdSMahesh Salgaonkar 624de269129SMahesh Salgaonkar int opal_hmi_exception_early2(struct pt_regs *regs) 625de269129SMahesh Salgaonkar { 626de269129SMahesh Salgaonkar s64 rc; 627de269129SMahesh Salgaonkar __be64 out_flags; 628de269129SMahesh Salgaonkar 629de269129SMahesh Salgaonkar /* 630de269129SMahesh Salgaonkar * call opal hmi handler. 631de269129SMahesh Salgaonkar * Check 64-bit flag mask to find out if an event was generated, 632de269129SMahesh Salgaonkar * and whether TB is still valid or not etc. 633de269129SMahesh Salgaonkar */ 634de269129SMahesh Salgaonkar rc = opal_handle_hmi2(&out_flags); 635de269129SMahesh Salgaonkar if (rc != OPAL_SUCCESS) 636de269129SMahesh Salgaonkar return 0; 637de269129SMahesh Salgaonkar 638de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) 639de269129SMahesh Salgaonkar local_paca->hmi_event_available = 1; 640de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) 641de269129SMahesh Salgaonkar tb_invalid = true; 642de269129SMahesh Salgaonkar return 1; 643de269129SMahesh Salgaonkar } 644de269129SMahesh Salgaonkar 6450869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 6460869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 6470869b6fdSMahesh Salgaonkar { 6480ef95b41SMahesh Salgaonkar /* 6490ef95b41SMahesh Salgaonkar * Check if HMI event is available. 65056c0b48bSNicholas Piggin * if Yes, then wake kopald to process them. 6510ef95b41SMahesh Salgaonkar */ 6520ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 6530869b6fdSMahesh Salgaonkar return 0; 6540ef95b41SMahesh Salgaonkar 6550ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 65656c0b48bSNicholas Piggin opal_wake_poller(); 6570ef95b41SMahesh Salgaonkar 6580ef95b41SMahesh Salgaonkar return 1; 6590869b6fdSMahesh Salgaonkar } 6600869b6fdSMahesh Salgaonkar 66155672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 66255672ecfSMahesh Salgaonkar { 66355672ecfSMahesh Salgaonkar int i; 66455672ecfSMahesh Salgaonkar 66555672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 66655672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 66755672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 66855672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 66955672ecfSMahesh Salgaonkar return 0; 67055672ecfSMahesh Salgaonkar } 67155672ecfSMahesh Salgaonkar 67255672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 67355672ecfSMahesh Salgaonkar { 67455672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 67555672ecfSMahesh Salgaonkar 67655672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 67755672ecfSMahesh Salgaonkar goto out; 67855672ecfSMahesh Salgaonkar 67955672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 680dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 68155672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 68255672ecfSMahesh Salgaonkar 68355672ecfSMahesh Salgaonkar /* 68455672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 68555672ecfSMahesh Salgaonkar */ 68655672ecfSMahesh Salgaonkar if (recover_addr) 68755672ecfSMahesh Salgaonkar regs->nip = recover_addr; 68855672ecfSMahesh Salgaonkar 68955672ecfSMahesh Salgaonkar out: 69055672ecfSMahesh Salgaonkar return !!recover_addr; 69155672ecfSMahesh Salgaonkar } 69255672ecfSMahesh Salgaonkar 6936f68b5e2SVasant Hegde static int opal_sysfs_init(void) 6946f68b5e2SVasant Hegde { 6956f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 6966f68b5e2SVasant Hegde if (!opal_kobj) { 6976f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 6986f68b5e2SVasant Hegde return -ENOMEM; 6996f68b5e2SVasant Hegde } 7006f68b5e2SVasant Hegde 7016f68b5e2SVasant Hegde return 0; 7026f68b5e2SVasant Hegde } 7036f68b5e2SVasant Hegde 704c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 705c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 706c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 707c8742f85SBenjamin Herrenschmidt { 708c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 709c8742f85SBenjamin Herrenschmidt bin_attr->size); 710c8742f85SBenjamin Herrenschmidt } 711c8742f85SBenjamin Herrenschmidt 712c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 713c8742f85SBenjamin Herrenschmidt 714c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 715c8742f85SBenjamin Herrenschmidt { 716c8742f85SBenjamin Herrenschmidt const __be64 *syms; 717c8742f85SBenjamin Herrenschmidt unsigned int size; 718c8742f85SBenjamin Herrenschmidt struct device_node *fw; 719c8742f85SBenjamin Herrenschmidt int rc; 720c8742f85SBenjamin Herrenschmidt 721c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 722c8742f85SBenjamin Herrenschmidt if (!fw) 723c8742f85SBenjamin Herrenschmidt return; 724c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 725c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 726c8742f85SBenjamin Herrenschmidt return; 727c8742f85SBenjamin Herrenschmidt 728c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 729c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 730c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 731c8742f85SBenjamin Herrenschmidt 732c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 733c8742f85SBenjamin Herrenschmidt if (rc) 734c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 735c8742f85SBenjamin Herrenschmidt } 736c8742f85SBenjamin Herrenschmidt 73711fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 73811fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 73911fe909dSMatt Brown loff_t off, size_t count) 74011fe909dSMatt Brown { 74111fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 74211fe909dSMatt Brown bin_attr->size); 74311fe909dSMatt Brown } 74411fe909dSMatt Brown 74511fe909dSMatt Brown /* 74611fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 74711fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 74811fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 74911fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 75011fe909dSMatt Brown * The new sysfs nodes are only readable by root. 75111fe909dSMatt Brown */ 75211fe909dSMatt Brown static void opal_export_attrs(void) 75311fe909dSMatt Brown { 75411fe909dSMatt Brown struct bin_attribute *attr; 75511fe909dSMatt Brown struct device_node *np; 75611fe909dSMatt Brown struct property *prop; 75711fe909dSMatt Brown struct kobject *kobj; 75811fe909dSMatt Brown u64 vals[2]; 75911fe909dSMatt Brown int rc; 76011fe909dSMatt Brown 76111fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 76211fe909dSMatt Brown if (!np) 76311fe909dSMatt Brown return; 76411fe909dSMatt Brown 76511fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 76611fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 76711fe909dSMatt Brown if (!kobj) { 76811fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 76911fe909dSMatt Brown return; 77011fe909dSMatt Brown } 77111fe909dSMatt Brown 77211fe909dSMatt Brown for_each_property_of_node(np, prop) { 77311fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 77411fe909dSMatt Brown continue; 77511fe909dSMatt Brown 77611fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 77711fe909dSMatt Brown continue; 77811fe909dSMatt Brown 77983c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 78011fe909dSMatt Brown 78111fe909dSMatt Brown if (attr == NULL) { 78211fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 78311fe909dSMatt Brown continue; 78411fe909dSMatt Brown } 78511fe909dSMatt Brown 78683c49190SMichael Ellerman sysfs_bin_attr_init(attr); 78711fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 78811fe909dSMatt Brown attr->attr.mode = 0400; 78911fe909dSMatt Brown attr->read = export_attr_read; 79011fe909dSMatt Brown attr->private = __va(vals[0]); 79111fe909dSMatt Brown attr->size = vals[1]; 79211fe909dSMatt Brown 79311fe909dSMatt Brown if (attr->attr.name == NULL) { 79411fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 79511fe909dSMatt Brown kfree(attr); 79611fe909dSMatt Brown continue; 79711fe909dSMatt Brown } 79811fe909dSMatt Brown 79911fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 80011fe909dSMatt Brown if (rc) { 80111fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 80211fe909dSMatt Brown rc, prop->name); 80311fe909dSMatt Brown kfree(attr->attr.name); 80411fe909dSMatt Brown kfree(attr); 80511fe909dSMatt Brown } 80611fe909dSMatt Brown } 80711fe909dSMatt Brown 80811fe909dSMatt Brown of_node_put(np); 80911fe909dSMatt Brown } 81011fe909dSMatt Brown 811b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 812b09c2ec4SVasant Hegde { 813b09c2ec4SVasant Hegde void *addr; 814b09c2ec4SVasant Hegde uint64_t size; 815b09c2ec4SVasant Hegde int rc; 816b09c2ec4SVasant Hegde 817b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 818b962f5a4SStewart Smith return; 819b962f5a4SStewart Smith 820b09c2ec4SVasant Hegde /* Register kernel log buffer */ 821b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 8226501ab5eSPranith Kumar if (addr == NULL) 8236501ab5eSPranith Kumar return; 8246501ab5eSPranith Kumar 825b09c2ec4SVasant Hegde size = log_buf_len_get(); 8266501ab5eSPranith Kumar if (size == 0) 8276501ab5eSPranith Kumar return; 8286501ab5eSPranith Kumar 829b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 830b09c2ec4SVasant Hegde __pa(addr), size); 831b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 832b09c2ec4SVasant Hegde * know about that call 833b09c2ec4SVasant Hegde */ 834b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 835b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 836b09c2ec4SVasant Hegde "rc = %d\n", rc); 837b09c2ec4SVasant Hegde } 838608b286dSJeremy Kerr 8399e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 840ed59190eSCyril Bur { 841ed59190eSCyril Bur struct device_node *np; 842ed59190eSCyril Bur 8439e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 84447083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 84547083450SNeelesh Gupta } 84647083450SNeelesh Gupta 8478f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 8488f95faaaSMadhavan Srinivasan { 8498f95faaaSMadhavan Srinivasan struct device_node *np; 8508f95faaaSMadhavan Srinivasan 8518f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 8528f95faaaSMadhavan Srinivasan if (np) 8538f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 8548f95faaaSMadhavan Srinivasan } 8558f95faaaSMadhavan Srinivasan 8563bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 8573bf57561SBenjamin Herrenschmidt { 858a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 8599f0fd049SAlistair Popple 8603bf57561SBenjamin Herrenschmidt set_freezable(); 8613bf57561SBenjamin Herrenschmidt do { 8623bf57561SBenjamin Herrenschmidt try_to_freeze(); 86356c0b48bSNicholas Piggin 86456c0b48bSNicholas Piggin opal_handle_events(); 86556c0b48bSNicholas Piggin 86656c0b48bSNicholas Piggin set_current_state(TASK_INTERRUPTIBLE); 86756c0b48bSNicholas Piggin if (opal_have_pending_events()) 86856c0b48bSNicholas Piggin __set_current_state(TASK_RUNNING); 86956c0b48bSNicholas Piggin else 87056c0b48bSNicholas Piggin schedule_timeout(timeout); 87156c0b48bSNicholas Piggin 8723bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 8733bf57561SBenjamin Herrenschmidt 8743bf57561SBenjamin Herrenschmidt return 0; 8753bf57561SBenjamin Herrenschmidt } 8763bf57561SBenjamin Herrenschmidt 877a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 878a203658bSBenjamin Herrenschmidt { 879a203658bSBenjamin Herrenschmidt if (kopald_tsk) 880a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 881a203658bSBenjamin Herrenschmidt } 882a203658bSBenjamin Herrenschmidt 8833bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 8843bf57561SBenjamin Herrenschmidt { 8853bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 8863bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 8873bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 8883bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 8893bf57561SBenjamin Herrenschmidt 8903bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 891a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 8923bf57561SBenjamin Herrenschmidt } 8933bf57561SBenjamin Herrenschmidt 89414a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 89514a43e69SBenjamin Herrenschmidt { 896c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 897c1c3a526SGavin Shan int rc; 89814a43e69SBenjamin Herrenschmidt 89914a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 90014a43e69SBenjamin Herrenschmidt if (!opal_node) { 90108135139SMichael Ellerman pr_warn("Device node not found\n"); 90214a43e69SBenjamin Herrenschmidt return -ENODEV; 90314a43e69SBenjamin Herrenschmidt } 9042db29d28SBenjamin Herrenschmidt 9052db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 90614a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 9072db29d28SBenjamin Herrenschmidt if (consoles) { 90814a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 9092c8e65b5SRob Herring if (!of_node_name_eq(np, "serial")) 91014a43e69SBenjamin Herrenschmidt continue; 91114a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 91214a43e69SBenjamin Herrenschmidt } 91314a43e69SBenjamin Herrenschmidt of_node_put(consoles); 9142db29d28SBenjamin Herrenschmidt } 915a125e092SBenjamin Herrenschmidt 91696e023e7SAlistair Popple /* Initialise OPAL messaging system */ 91796e023e7SAlistair Popple opal_message_init(); 91896e023e7SAlistair Popple 91996e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 92096e023e7SAlistair Popple opal_async_comp_init(); 92196e023e7SAlistair Popple 92296e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 92396e023e7SAlistair Popple opal_sensor_init(); 92496e023e7SAlistair Popple 92596e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 92696e023e7SAlistair Popple opal_hmi_handler_init(); 92796e023e7SAlistair Popple 92847083450SNeelesh Gupta /* Create i2c platform devices */ 9299e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 93047083450SNeelesh Gupta 9313013e173SOliver O'Halloran /* Handle non-volatile memory devices */ 9323013e173SOliver O'Halloran opal_pdev_init("pmem-region"); 9333013e173SOliver O'Halloran 9343bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 9353bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 9363bf57561SBenjamin Herrenschmidt 9378f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 9388f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 9398f95faaaSMadhavan Srinivasan 940c159b596SVasant Hegde /* Create leds platform devices */ 941c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 942c159b596SVasant Hegde if (leds) { 943c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 944c159b596SVasant Hegde of_node_put(leds); 945c159b596SVasant Hegde } 946c159b596SVasant Hegde 9479b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 9489b4fffa1SAndrew Donnellan opal_msglog_init(); 9499b4fffa1SAndrew Donnellan 9506f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 9516f68b5e2SVasant Hegde rc = opal_sysfs_init(); 95250bd6153SVasant Hegde if (rc == 0) { 953c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 954c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 955b09c2ec4SVasant Hegde /* Setup dump region interface */ 956b09c2ec4SVasant Hegde opal_dump_region_init(); 957774fea1aSStewart Smith /* Setup error log interface */ 958774fea1aSStewart Smith rc = opal_elog_init(); 95950bd6153SVasant Hegde /* Setup code update interface */ 960ed59190eSCyril Bur opal_flash_update_init(); 961c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 962c7e64b9cSStewart Smith opal_platform_dump_init(); 9634029cd66SNeelesh Gupta /* Setup system parameters interface */ 9644029cd66SNeelesh Gupta opal_sys_param_init(); 9659b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 9669b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 96750bd6153SVasant Hegde } 9686f68b5e2SVasant Hegde 96911fe909dSMatt Brown /* Export all properties */ 97011fe909dSMatt Brown opal_export_attrs(); 97111fe909dSMatt Brown 9720d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 9739e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 9749e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 9759e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 976ed59190eSCyril Bur 97743a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 9789e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 97943a1dd9bSSuraj Jitindar Singh 980affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 981affddff6SRussell Currey opal_kmsg_init(); 982affddff6SRussell Currey 983cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 984cb8b340dSShilpasri G Bhat opal_powercap_init(); 985cb8b340dSShilpasri G Bhat 9868e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 9878e84b2d1SShilpasri G Bhat opal_psr_init(); 9888e84b2d1SShilpasri G Bhat 989bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 990bf957155SShilpasri G Bhat opal_sensor_groups_init(); 991bf957155SShilpasri G Bhat 99208fb726dSMahesh Salgaonkar /* Initialise OPAL Power control interface */ 99308fb726dSMahesh Salgaonkar opal_power_control_init(); 99408fb726dSMahesh Salgaonkar 99514a43e69SBenjamin Herrenschmidt return 0; 99614a43e69SBenjamin Herrenschmidt } 997b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 99873ed148aSBenjamin Herrenschmidt 99973ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 100073ed148aSBenjamin Herrenschmidt { 1001f7d98d18SVasant Hegde long rc = OPAL_BUSY; 100273ed148aSBenjamin Herrenschmidt 10039f0fd049SAlistair Popple opal_event_shutdown(); 1004f7d98d18SVasant Hegde 1005f7d98d18SVasant Hegde /* 1006f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 1007f7d98d18SVasant Hegde * potentially write to our memory has completed such 1008f7d98d18SVasant Hegde * as an ongoing dump retrieval 1009f7d98d18SVasant Hegde */ 1010f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 1011f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 1012f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 1013f7d98d18SVasant Hegde opal_poll_events(NULL); 1014f7d98d18SVasant Hegde else 1015f7d98d18SVasant Hegde mdelay(10); 1016f7d98d18SVasant Hegde } 1017b09c2ec4SVasant Hegde 1018b09c2ec4SVasant Hegde /* Unregister memory dump region */ 1019b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 1020b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 102173ed148aSBenjamin Herrenschmidt } 1022e28b05e7SJoel Stanley 1023e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 1024e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 1025594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 1026594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 1027608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 1028608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 1029ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 1030ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 1031ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 10320d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 10336e708000SHaren Myneni EXPORT_SYMBOL_GPL(opal_check_token); 10343441f04bSAnton Blanchard 10353441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 10363441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 10373441f04bSAnton Blanchard unsigned long vmalloc_size) 10383441f04bSAnton Blanchard { 10393441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 10403441f04bSAnton Blanchard unsigned long i = 0; 10413441f04bSAnton Blanchard 10423441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 10433441f04bSAnton Blanchard if (!sg) 10443441f04bSAnton Blanchard goto nomem; 10453441f04bSAnton Blanchard 10463441f04bSAnton Blanchard first = sg; 10473441f04bSAnton Blanchard 10483441f04bSAnton Blanchard while (vmalloc_size > 0) { 10493441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 10503441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 10513441f04bSAnton Blanchard 10523441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 10533441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 10543441f04bSAnton Blanchard i++; 10553441f04bSAnton Blanchard 10563441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 10573441f04bSAnton Blanchard struct opal_sg_list *next; 10583441f04bSAnton Blanchard 10593441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 10603441f04bSAnton Blanchard if (!next) 10613441f04bSAnton Blanchard goto nomem; 10623441f04bSAnton Blanchard 10633441f04bSAnton Blanchard sg->length = cpu_to_be64( 10643441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 10653441f04bSAnton Blanchard i = 0; 10663441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 10673441f04bSAnton Blanchard sg = next; 10683441f04bSAnton Blanchard } 10693441f04bSAnton Blanchard 10703441f04bSAnton Blanchard vmalloc_addr += length; 10713441f04bSAnton Blanchard vmalloc_size -= length; 10723441f04bSAnton Blanchard } 10733441f04bSAnton Blanchard 10743441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 10753441f04bSAnton Blanchard 10763441f04bSAnton Blanchard return first; 10773441f04bSAnton Blanchard 10783441f04bSAnton Blanchard nomem: 10793441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 10803441f04bSAnton Blanchard opal_free_sg_list(first); 10813441f04bSAnton Blanchard return NULL; 10823441f04bSAnton Blanchard } 10833441f04bSAnton Blanchard 10843441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 10853441f04bSAnton Blanchard { 10863441f04bSAnton Blanchard while (sg) { 10873441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 10883441f04bSAnton Blanchard 10893441f04bSAnton Blanchard kfree(sg); 10903441f04bSAnton Blanchard 10913441f04bSAnton Blanchard if (next) 10923441f04bSAnton Blanchard sg = __va(next); 10933441f04bSAnton Blanchard else 10943441f04bSAnton Blanchard sg = NULL; 10953441f04bSAnton Blanchard } 10963441f04bSAnton Blanchard } 109716b1d26eSNeelesh Gupta 1098e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 1099e3c5c2e0SCédric Le Goater { 1100e3c5c2e0SCédric Le Goater switch (rc) { 1101e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 1102e3c5c2e0SCédric Le Goater 1103e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 1104e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 110577adbd22SCyril Bur case OPAL_BUSY: 1106e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 1107e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 110814aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 1109e3c5c2e0SCédric Le Goater 1110e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 1111e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 1112e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 1113cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 1114e3c5c2e0SCédric Le Goater default: 1115e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1116e3c5c2e0SCédric Le Goater return -EIO; 1117e3c5c2e0SCédric Le Goater } 1118e3c5c2e0SCédric Le Goater } 1119e3c5c2e0SCédric Le Goater 11201d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 11211d0761d2SAlistair Popple { 11221d0761d2SAlistair Popple int rc; 11231d0761d2SAlistair Popple 11241d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 11251d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 11261d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 11271d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 11281d0761d2SAlistair Popple } 11291d0761d2SAlistair Popple } 11301d0761d2SAlistair Popple 113116b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 113216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 113316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 113416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 113516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 113647083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 1137c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1138c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1139c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 114043a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 114143a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1142ffe6d810SPaul Mackerras /* Export this for KVM */ 1143ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 11445af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 114577adbd22SCyril Bur EXPORT_SYMBOL_GPL(opal_error_code); 1146656ecc16SHaren Myneni /* Export the below symbol for NX compression */ 1147656ecc16SHaren Myneni EXPORT_SYMBOL(opal_nx_coproc_init); 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