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 /* 2096507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2106507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2116507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2126507955cSMahesh Salgaonkar * 2136507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2146507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2156507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2166507955cSMahesh Salgaonkar * 2176507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2186507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2196507955cSMahesh Salgaonkar */ 2206507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 22108135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2226507955cSMahesh Salgaonkar opal_register_exception_handler( 2236507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2246507955cSMahesh Salgaonkar 0, glue); 2256507955cSMahesh Salgaonkar glue += 128; 2266507955cSMahesh Salgaonkar } 2276507955cSMahesh Salgaonkar 228ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 22929186097SBenjamin Herrenschmidt #endif 230ed79ba9eSBenjamin Herrenschmidt 231c4463b37SJeremy Kerr return 0; 23214a43e69SBenjamin Herrenschmidt } 233b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 234c4463b37SJeremy Kerr 23524366360SMahesh Salgaonkar /* 23624366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 23724366360SMahesh Salgaonkar * notified for specific messgae type. 23824366360SMahesh Salgaonkar */ 239d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 24024366360SMahesh Salgaonkar struct notifier_block *nb) 24124366360SMahesh Salgaonkar { 242792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 243f2c2cbccSJoe Perches pr_warn("%s: Invalid arguments, msg_type:%d\n", 24424366360SMahesh Salgaonkar __func__, msg_type); 24524366360SMahesh Salgaonkar return -EINVAL; 24624366360SMahesh Salgaonkar } 247792f96e9SNeelesh Gupta 24824366360SMahesh Salgaonkar return atomic_notifier_chain_register( 24924366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 25024366360SMahesh Salgaonkar } 251594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 25224366360SMahesh Salgaonkar 253df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 254b921e902SNeelesh Gupta struct notifier_block *nb) 255b921e902SNeelesh Gupta { 256b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 257b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 258b921e902SNeelesh Gupta } 259594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 260b921e902SNeelesh Gupta 26124366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 26224366360SMahesh Salgaonkar { 26324366360SMahesh Salgaonkar /* notify subscribers */ 26424366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 26524366360SMahesh Salgaonkar msg_type, msg); 26624366360SMahesh Salgaonkar } 26724366360SMahesh Salgaonkar 26824366360SMahesh Salgaonkar static void opal_handle_message(void) 26924366360SMahesh Salgaonkar { 27024366360SMahesh Salgaonkar s64 ret; 27124366360SMahesh Salgaonkar /* 27224366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 27324366360SMahesh Salgaonkar * value in /proc/device-tree. 27424366360SMahesh Salgaonkar */ 27524366360SMahesh Salgaonkar static struct opal_msg msg; 276bb4398e1SAnton Blanchard u32 type; 27724366360SMahesh Salgaonkar 27824366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 27924366360SMahesh Salgaonkar /* No opal message pending. */ 28024366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 28124366360SMahesh Salgaonkar return; 28224366360SMahesh Salgaonkar 28324366360SMahesh Salgaonkar /* check for errors. */ 28424366360SMahesh Salgaonkar if (ret) { 285f2c2cbccSJoe Perches pr_warn("%s: Failed to retrieve opal message, err=%lld\n", 28624366360SMahesh Salgaonkar __func__, ret); 28724366360SMahesh Salgaonkar return; 28824366360SMahesh Salgaonkar } 28924366360SMahesh Salgaonkar 290bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 291bb4398e1SAnton Blanchard 29224366360SMahesh Salgaonkar /* Sanity check */ 293792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 29498da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 29524366360SMahesh Salgaonkar return; 29624366360SMahesh Salgaonkar } 297bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 29824366360SMahesh Salgaonkar } 29924366360SMahesh Salgaonkar 300a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 30124366360SMahesh Salgaonkar { 30224366360SMahesh Salgaonkar opal_handle_message(); 303a295af24SAlistair Popple return IRQ_HANDLED; 30424366360SMahesh Salgaonkar } 30524366360SMahesh Salgaonkar 30624366360SMahesh Salgaonkar static int __init opal_message_init(void) 30724366360SMahesh Salgaonkar { 308a295af24SAlistair Popple int ret, i, irq; 30924366360SMahesh Salgaonkar 31024366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 31124366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 31224366360SMahesh Salgaonkar 313a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 314a295af24SAlistair Popple if (!irq) { 315a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 316a295af24SAlistair Popple __func__, irq); 317a295af24SAlistair Popple return irq; 318a295af24SAlistair Popple } 319a295af24SAlistair Popple 320a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 321a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 32224366360SMahesh Salgaonkar if (ret) { 323a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 32424366360SMahesh Salgaonkar __func__, ret); 32524366360SMahesh Salgaonkar return ret; 32624366360SMahesh Salgaonkar } 327a295af24SAlistair Popple 32824366360SMahesh Salgaonkar return 0; 32924366360SMahesh Salgaonkar } 33024366360SMahesh Salgaonkar 33114a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 33214a43e69SBenjamin Herrenschmidt { 3334f89363bSBenjamin Herrenschmidt s64 rc; 3344f89363bSBenjamin Herrenschmidt __be64 evt, len; 33514a43e69SBenjamin Herrenschmidt 33614a43e69SBenjamin Herrenschmidt if (!opal.entry) 337daea1175SBenjamin Herrenschmidt return -ENODEV; 33814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3394f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 34014a43e69SBenjamin Herrenschmidt return 0; 3414f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 34214a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 34314a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3444f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 34514a43e69SBenjamin Herrenschmidt return 0; 34614a43e69SBenjamin Herrenschmidt } 34714a43e69SBenjamin Herrenschmidt 34817cc1dd4SNicholas Piggin static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) 34914a43e69SBenjamin Herrenschmidt { 35017cc1dd4SNicholas Piggin unsigned long flags = 0 /* shut up gcc */; 351b74d2807SNicholas Piggin int written; 352b74d2807SNicholas Piggin __be64 olen; 353b74d2807SNicholas Piggin s64 rc; 35414a43e69SBenjamin Herrenschmidt 35514a43e69SBenjamin Herrenschmidt if (!opal.entry) 356daea1175SBenjamin Herrenschmidt return -ENODEV; 35714a43e69SBenjamin Herrenschmidt 35817cc1dd4SNicholas Piggin if (atomic) 35914a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3604f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 361b74d2807SNicholas Piggin if (rc || be64_to_cpu(olen) < total_len) { 36214a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 36314a43e69SBenjamin Herrenschmidt if (rc) 364b74d2807SNicholas Piggin written = total_len; 365b74d2807SNicholas Piggin else 366b74d2807SNicholas Piggin written = -EAGAIN; 367b74d2807SNicholas Piggin goto out; 36814a43e69SBenjamin Herrenschmidt } 36914a43e69SBenjamin Herrenschmidt 370b74d2807SNicholas Piggin /* Should not get a partial write here because space is available. */ 3714f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3724f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 373b74d2807SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 37495b861a7SNicholas Piggin if (rc == OPAL_BUSY_EVENT) 37536d2dabcSNicholas Piggin opal_poll_events(NULL); 376b74d2807SNicholas Piggin written = -EAGAIN; 377b74d2807SNicholas Piggin goto out; 37836d2dabcSNicholas Piggin } 37936d2dabcSNicholas Piggin 3801de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 38136d2dabcSNicholas Piggin if (rc != OPAL_SUCCESS) { 382b74d2807SNicholas Piggin written = opal_error_code(rc); 383b74d2807SNicholas Piggin goto out; 3841de1455fSBenjamin Herrenschmidt } 38536d2dabcSNicholas Piggin 386b74d2807SNicholas Piggin written = be64_to_cpu(olen); 387b74d2807SNicholas Piggin if (written < total_len) { 38817cc1dd4SNicholas Piggin if (atomic) { 389b74d2807SNicholas Piggin /* Should not happen */ 39017cc1dd4SNicholas Piggin pr_warn("atomic console write returned partial " 39117cc1dd4SNicholas Piggin "len=%d written=%d\n", total_len, written); 39217cc1dd4SNicholas Piggin } 393b74d2807SNicholas Piggin if (!written) 394b74d2807SNicholas Piggin written = -EAGAIN; 395b74d2807SNicholas Piggin } 396b74d2807SNicholas Piggin 397b74d2807SNicholas Piggin out: 39817cc1dd4SNicholas Piggin if (atomic) 399b74d2807SNicholas Piggin spin_unlock_irqrestore(&opal_write_lock, flags); 40036d2dabcSNicholas Piggin 401d2a2262eSNicholas Piggin return written; 402d2a2262eSNicholas Piggin } 403d2a2262eSNicholas Piggin 40417cc1dd4SNicholas Piggin int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 40517cc1dd4SNicholas Piggin { 40617cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, false); 40717cc1dd4SNicholas Piggin } 40817cc1dd4SNicholas Piggin 40917cc1dd4SNicholas Piggin /* 41017cc1dd4SNicholas Piggin * opal_put_chars_atomic will not perform partial-writes. Data will be 41117cc1dd4SNicholas Piggin * atomically written to the terminal or not at all. This is not strictly 41217cc1dd4SNicholas Piggin * true at the moment because console space can race with OPAL's console 41317cc1dd4SNicholas Piggin * writes. 41417cc1dd4SNicholas Piggin */ 41517cc1dd4SNicholas Piggin int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) 41617cc1dd4SNicholas Piggin { 41717cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, true); 41817cc1dd4SNicholas Piggin } 41917cc1dd4SNicholas Piggin 42095b861a7SNicholas Piggin static s64 __opal_flush_console(uint32_t vtermno) 421d2a2262eSNicholas Piggin { 422d2a2262eSNicholas Piggin s64 rc; 423d2a2262eSNicholas Piggin 424d2a2262eSNicholas Piggin if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { 425d2a2262eSNicholas Piggin __be64 evt; 426d2a2262eSNicholas Piggin 427d2a2262eSNicholas Piggin /* 428d2a2262eSNicholas Piggin * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, 429d2a2262eSNicholas Piggin * the console can still be flushed by calling the polling 430d2a2262eSNicholas Piggin * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. 431d2a2262eSNicholas Piggin */ 43295b861a7SNicholas Piggin WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); 43395b861a7SNicholas Piggin 43414a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 43595b861a7SNicholas Piggin if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) 436d2a2262eSNicholas Piggin return OPAL_SUCCESS; 43795b861a7SNicholas Piggin return OPAL_BUSY; 438d2a2262eSNicholas Piggin 43995b861a7SNicholas Piggin } else { 440d2a2262eSNicholas Piggin rc = opal_console_flush(vtermno); 441d2a2262eSNicholas Piggin if (rc == OPAL_BUSY_EVENT) { 442d2a2262eSNicholas Piggin opal_poll_events(NULL); 44395b861a7SNicholas Piggin rc = OPAL_BUSY; 444d2a2262eSNicholas Piggin } 44595b861a7SNicholas Piggin return rc; 446d2a2262eSNicholas Piggin } 44795b861a7SNicholas Piggin 44895b861a7SNicholas Piggin } 44995b861a7SNicholas Piggin 45095b861a7SNicholas Piggin /* 45195b861a7SNicholas Piggin * opal_flush_console spins until the console is flushed 45295b861a7SNicholas Piggin */ 45395b861a7SNicholas Piggin int opal_flush_console(uint32_t vtermno) 45495b861a7SNicholas Piggin { 45595b861a7SNicholas Piggin for (;;) { 45695b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 45795b861a7SNicholas Piggin 45895b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 45995b861a7SNicholas Piggin mdelay(1); 46095b861a7SNicholas Piggin continue; 46195b861a7SNicholas Piggin } 462d2a2262eSNicholas Piggin 463d2a2262eSNicholas Piggin return opal_error_code(rc); 46414a43e69SBenjamin Herrenschmidt } 46595b861a7SNicholas Piggin } 46695b861a7SNicholas Piggin 46795b861a7SNicholas Piggin /* 46895b861a7SNicholas Piggin * opal_flush_chars is an hvc interface that sleeps until the console is 46995b861a7SNicholas Piggin * flushed if wait, otherwise it will return -EBUSY if the console has data, 47095b861a7SNicholas Piggin * -EAGAIN if it has data and some of it was flushed. 47195b861a7SNicholas Piggin */ 47295b861a7SNicholas Piggin int opal_flush_chars(uint32_t vtermno, bool wait) 47395b861a7SNicholas Piggin { 47495b861a7SNicholas Piggin for (;;) { 47595b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 47695b861a7SNicholas Piggin 47795b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 47895b861a7SNicholas Piggin if (wait) { 47995b861a7SNicholas Piggin msleep(OPAL_BUSY_DELAY_MS); 48095b861a7SNicholas Piggin continue; 48195b861a7SNicholas Piggin } 48295b861a7SNicholas Piggin if (rc == OPAL_PARTIAL) 48395b861a7SNicholas Piggin return -EAGAIN; 48495b861a7SNicholas Piggin } 48595b861a7SNicholas Piggin 48695b861a7SNicholas Piggin return opal_error_code(rc); 48795b861a7SNicholas Piggin } 48895b861a7SNicholas Piggin } 48914a43e69SBenjamin Herrenschmidt 490b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 491b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 492b63a0ffeSMahesh Salgaonkar { 493b63a0ffeSMahesh Salgaonkar int recovered = 0; 494b63a0ffeSMahesh Salgaonkar 495b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 496b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 497c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 498b63a0ffeSMahesh Salgaonkar recovered = 0; 499b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 500b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 501b63a0ffeSMahesh Salgaonkar recovered = 1; 5021363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 5031363875bSNicholas Piggin /* Fatal machine check */ 5041363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 5051363875bSNicholas Piggin recovered = 0; 5066fcd6baaSNicholas Piggin } 5076fcd6baaSNicholas Piggin 508cda6618dSMahesh Salgaonkar if (!recovered && evt->sync_error) { 509b63a0ffeSMahesh Salgaonkar /* 5106fcd6baaSNicholas Piggin * Try to kill processes if we get a synchronous machine check 5116fcd6baaSNicholas Piggin * (e.g., one caused by execution of this instruction). This 5126fcd6baaSNicholas Piggin * will devolve into a panic if we try to kill init or are in 5136fcd6baaSNicholas Piggin * an interrupt etc. 514b63a0ffeSMahesh Salgaonkar * 515b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 5166fcd6baaSNicholas Piggin * TODO: This is not quite right for d-side machine 5176fcd6baaSNicholas Piggin * checks ->nip is not necessarily the important 5186fcd6baaSNicholas Piggin * address. 519b63a0ffeSMahesh Salgaonkar */ 5206fcd6baaSNicholas Piggin if ((user_mode(regs))) { 521b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 522b63a0ffeSMahesh Salgaonkar recovered = 1; 5236fcd6baaSNicholas Piggin } else if (die_will_crash()) { 5246fcd6baaSNicholas Piggin /* 5256fcd6baaSNicholas Piggin * die() would kill the kernel, so better to go via 5266fcd6baaSNicholas Piggin * the platform reboot code that will log the 5276fcd6baaSNicholas Piggin * machine check. 5286fcd6baaSNicholas Piggin */ 5296fcd6baaSNicholas Piggin recovered = 0; 5306fcd6baaSNicholas Piggin } else { 5316fcd6baaSNicholas Piggin die("Machine check", regs, SIGBUS); 5326fcd6baaSNicholas Piggin recovered = 1; 533b63a0ffeSMahesh Salgaonkar } 5346fcd6baaSNicholas Piggin } 5356fcd6baaSNicholas Piggin 536b63a0ffeSMahesh Salgaonkar return recovered; 537b63a0ffeSMahesh Salgaonkar } 538b63a0ffeSMahesh Salgaonkar 53962dea077SBreno Leitao void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 540b746e3e0SNicholas Piggin { 54135adacd6SNicholas Piggin panic_flush_kmsg_start(); 54235adacd6SNicholas Piggin 543b746e3e0SNicholas Piggin pr_emerg("Hardware platform error: %s\n", msg); 544b746e3e0SNicholas Piggin if (regs) 545b746e3e0SNicholas Piggin show_regs(regs); 546b746e3e0SNicholas Piggin smp_send_stop(); 54735adacd6SNicholas Piggin 54835adacd6SNicholas Piggin panic_flush_kmsg_end(); 549b746e3e0SNicholas Piggin 550b746e3e0SNicholas Piggin /* 551b746e3e0SNicholas Piggin * Don't bother to shut things down because this will 552b746e3e0SNicholas Piggin * xstop the system. 553b746e3e0SNicholas Piggin */ 554b746e3e0SNicholas Piggin if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 555b746e3e0SNicholas Piggin == OPAL_UNSUPPORTED) { 556b746e3e0SNicholas Piggin pr_emerg("Reboot type %d not supported for %s\n", 557b746e3e0SNicholas Piggin OPAL_REBOOT_PLATFORM_ERROR, msg); 558b746e3e0SNicholas Piggin } 559b746e3e0SNicholas Piggin 560b746e3e0SNicholas Piggin /* 561b746e3e0SNicholas Piggin * We reached here. There can be three possibilities: 562b746e3e0SNicholas Piggin * 1. We are running on a firmware level that do not support 563b746e3e0SNicholas Piggin * opal_cec_reboot2() 564b746e3e0SNicholas Piggin * 2. We are running on a firmware level that do not support 565b746e3e0SNicholas Piggin * OPAL_REBOOT_PLATFORM_ERROR reboot type. 566b746e3e0SNicholas Piggin * 3. We are running on FSP based system that does not need 567b746e3e0SNicholas Piggin * opal to trigger checkstop explicitly for error analysis. 568b746e3e0SNicholas Piggin * The FSP PRD component would have already got notified 569b746e3e0SNicholas Piggin * about this error through other channels. 5705ee573e8SBalbir Singh * 4. We are running on a newer skiboot that by default does 5715ee573e8SBalbir Singh * not cause a checkstop, drops us back to the kernel to 5725ee573e8SBalbir Singh * extract context and state at the time of the error. 573b746e3e0SNicholas Piggin */ 574b746e3e0SNicholas Piggin 5755ee573e8SBalbir Singh panic(msg); 576b746e3e0SNicholas Piggin } 577b746e3e0SNicholas Piggin 578ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 579ed79ba9eSBenjamin Herrenschmidt { 58036df96f8SMahesh Salgaonkar struct machine_check_event evt; 581ed79ba9eSBenjamin Herrenschmidt 58236df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 58336df96f8SMahesh Salgaonkar return 0; 584ed79ba9eSBenjamin Herrenschmidt 585ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 58636df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 587ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 588ed79ba9eSBenjamin Herrenschmidt evt.version); 589ed79ba9eSBenjamin Herrenschmidt return 0; 590ed79ba9eSBenjamin Herrenschmidt } 591c0577201SPaul Mackerras machine_check_print_event_info(&evt, user_mode(regs), false); 592ed79ba9eSBenjamin Herrenschmidt 593b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 594b63a0ffeSMahesh Salgaonkar return 1; 595e784b649SMahesh Salgaonkar 596b746e3e0SNicholas Piggin pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 597ed79ba9eSBenjamin Herrenschmidt } 598ed79ba9eSBenjamin Herrenschmidt 5990869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 6000869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 6010869b6fdSMahesh Salgaonkar { 6020ef95b41SMahesh Salgaonkar s64 rc; 6030ef95b41SMahesh Salgaonkar 6040ef95b41SMahesh Salgaonkar /* 6050ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 6060ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 6070ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 6080ef95b41SMahesh Salgaonkar */ 6090ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 6100ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 6110ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 6120ef95b41SMahesh Salgaonkar return 1; 6130ef95b41SMahesh Salgaonkar } 6140869b6fdSMahesh Salgaonkar return 0; 6150869b6fdSMahesh Salgaonkar } 6160869b6fdSMahesh Salgaonkar 617de269129SMahesh Salgaonkar int opal_hmi_exception_early2(struct pt_regs *regs) 618de269129SMahesh Salgaonkar { 619de269129SMahesh Salgaonkar s64 rc; 620de269129SMahesh Salgaonkar __be64 out_flags; 621de269129SMahesh Salgaonkar 622de269129SMahesh Salgaonkar /* 623de269129SMahesh Salgaonkar * call opal hmi handler. 624de269129SMahesh Salgaonkar * Check 64-bit flag mask to find out if an event was generated, 625de269129SMahesh Salgaonkar * and whether TB is still valid or not etc. 626de269129SMahesh Salgaonkar */ 627de269129SMahesh Salgaonkar rc = opal_handle_hmi2(&out_flags); 628de269129SMahesh Salgaonkar if (rc != OPAL_SUCCESS) 629de269129SMahesh Salgaonkar return 0; 630de269129SMahesh Salgaonkar 631de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) 632de269129SMahesh Salgaonkar local_paca->hmi_event_available = 1; 633de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) 634de269129SMahesh Salgaonkar tb_invalid = true; 635de269129SMahesh Salgaonkar return 1; 636de269129SMahesh Salgaonkar } 637de269129SMahesh Salgaonkar 6380869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 6390869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 6400869b6fdSMahesh Salgaonkar { 6410ef95b41SMahesh Salgaonkar /* 6420ef95b41SMahesh Salgaonkar * Check if HMI event is available. 64356c0b48bSNicholas Piggin * if Yes, then wake kopald to process them. 6440ef95b41SMahesh Salgaonkar */ 6450ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 6460869b6fdSMahesh Salgaonkar return 0; 6470ef95b41SMahesh Salgaonkar 6480ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 64956c0b48bSNicholas Piggin opal_wake_poller(); 6500ef95b41SMahesh Salgaonkar 6510ef95b41SMahesh Salgaonkar return 1; 6520869b6fdSMahesh Salgaonkar } 6530869b6fdSMahesh Salgaonkar 65455672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 65555672ecfSMahesh Salgaonkar { 65655672ecfSMahesh Salgaonkar int i; 65755672ecfSMahesh Salgaonkar 65855672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 65955672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 66055672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 66155672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 66255672ecfSMahesh Salgaonkar return 0; 66355672ecfSMahesh Salgaonkar } 66455672ecfSMahesh Salgaonkar 66555672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 66655672ecfSMahesh Salgaonkar { 66755672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 66855672ecfSMahesh Salgaonkar 66955672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 67055672ecfSMahesh Salgaonkar goto out; 67155672ecfSMahesh Salgaonkar 67255672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 673dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 67455672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 67555672ecfSMahesh Salgaonkar 67655672ecfSMahesh Salgaonkar /* 67755672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 67855672ecfSMahesh Salgaonkar */ 67955672ecfSMahesh Salgaonkar if (recover_addr) 68055672ecfSMahesh Salgaonkar regs->nip = recover_addr; 68155672ecfSMahesh Salgaonkar 68255672ecfSMahesh Salgaonkar out: 68355672ecfSMahesh Salgaonkar return !!recover_addr; 68455672ecfSMahesh Salgaonkar } 68555672ecfSMahesh Salgaonkar 6866f68b5e2SVasant Hegde static int opal_sysfs_init(void) 6876f68b5e2SVasant Hegde { 6886f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 6896f68b5e2SVasant Hegde if (!opal_kobj) { 6906f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 6916f68b5e2SVasant Hegde return -ENOMEM; 6926f68b5e2SVasant Hegde } 6936f68b5e2SVasant Hegde 6946f68b5e2SVasant Hegde return 0; 6956f68b5e2SVasant Hegde } 6966f68b5e2SVasant Hegde 697c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 698c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 699c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 700c8742f85SBenjamin Herrenschmidt { 701c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 702c8742f85SBenjamin Herrenschmidt bin_attr->size); 703c8742f85SBenjamin Herrenschmidt } 704c8742f85SBenjamin Herrenschmidt 705c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 706c8742f85SBenjamin Herrenschmidt 707c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 708c8742f85SBenjamin Herrenschmidt { 709c8742f85SBenjamin Herrenschmidt const __be64 *syms; 710c8742f85SBenjamin Herrenschmidt unsigned int size; 711c8742f85SBenjamin Herrenschmidt struct device_node *fw; 712c8742f85SBenjamin Herrenschmidt int rc; 713c8742f85SBenjamin Herrenschmidt 714c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 715c8742f85SBenjamin Herrenschmidt if (!fw) 716c8742f85SBenjamin Herrenschmidt return; 717c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 718c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 719c8742f85SBenjamin Herrenschmidt return; 720c8742f85SBenjamin Herrenschmidt 721c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 722c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 723c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 724c8742f85SBenjamin Herrenschmidt 725c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 726c8742f85SBenjamin Herrenschmidt if (rc) 727c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 728c8742f85SBenjamin Herrenschmidt } 729c8742f85SBenjamin Herrenschmidt 73011fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 73111fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 73211fe909dSMatt Brown loff_t off, size_t count) 73311fe909dSMatt Brown { 73411fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 73511fe909dSMatt Brown bin_attr->size); 73611fe909dSMatt Brown } 73711fe909dSMatt Brown 73811fe909dSMatt Brown /* 73911fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 74011fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 74111fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 74211fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 74311fe909dSMatt Brown * The new sysfs nodes are only readable by root. 74411fe909dSMatt Brown */ 74511fe909dSMatt Brown static void opal_export_attrs(void) 74611fe909dSMatt Brown { 74711fe909dSMatt Brown struct bin_attribute *attr; 74811fe909dSMatt Brown struct device_node *np; 74911fe909dSMatt Brown struct property *prop; 75011fe909dSMatt Brown struct kobject *kobj; 75111fe909dSMatt Brown u64 vals[2]; 75211fe909dSMatt Brown int rc; 75311fe909dSMatt Brown 75411fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 75511fe909dSMatt Brown if (!np) 75611fe909dSMatt Brown return; 75711fe909dSMatt Brown 75811fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 75911fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 76011fe909dSMatt Brown if (!kobj) { 76111fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 76211fe909dSMatt Brown return; 76311fe909dSMatt Brown } 76411fe909dSMatt Brown 76511fe909dSMatt Brown for_each_property_of_node(np, prop) { 76611fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 76711fe909dSMatt Brown continue; 76811fe909dSMatt Brown 76911fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 77011fe909dSMatt Brown continue; 77111fe909dSMatt Brown 77283c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 77311fe909dSMatt Brown 77411fe909dSMatt Brown if (attr == NULL) { 77511fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 77611fe909dSMatt Brown continue; 77711fe909dSMatt Brown } 77811fe909dSMatt Brown 77983c49190SMichael Ellerman sysfs_bin_attr_init(attr); 78011fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 78111fe909dSMatt Brown attr->attr.mode = 0400; 78211fe909dSMatt Brown attr->read = export_attr_read; 78311fe909dSMatt Brown attr->private = __va(vals[0]); 78411fe909dSMatt Brown attr->size = vals[1]; 78511fe909dSMatt Brown 78611fe909dSMatt Brown if (attr->attr.name == NULL) { 78711fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 78811fe909dSMatt Brown kfree(attr); 78911fe909dSMatt Brown continue; 79011fe909dSMatt Brown } 79111fe909dSMatt Brown 79211fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 79311fe909dSMatt Brown if (rc) { 79411fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 79511fe909dSMatt Brown rc, prop->name); 79611fe909dSMatt Brown kfree(attr->attr.name); 79711fe909dSMatt Brown kfree(attr); 79811fe909dSMatt Brown } 79911fe909dSMatt Brown } 80011fe909dSMatt Brown 80111fe909dSMatt Brown of_node_put(np); 80211fe909dSMatt Brown } 80311fe909dSMatt Brown 804b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 805b09c2ec4SVasant Hegde { 806b09c2ec4SVasant Hegde void *addr; 807b09c2ec4SVasant Hegde uint64_t size; 808b09c2ec4SVasant Hegde int rc; 809b09c2ec4SVasant Hegde 810b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 811b962f5a4SStewart Smith return; 812b962f5a4SStewart Smith 813b09c2ec4SVasant Hegde /* Register kernel log buffer */ 814b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 8156501ab5eSPranith Kumar if (addr == NULL) 8166501ab5eSPranith Kumar return; 8176501ab5eSPranith Kumar 818b09c2ec4SVasant Hegde size = log_buf_len_get(); 8196501ab5eSPranith Kumar if (size == 0) 8206501ab5eSPranith Kumar return; 8216501ab5eSPranith Kumar 822b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 823b09c2ec4SVasant Hegde __pa(addr), size); 824b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 825b09c2ec4SVasant Hegde * know about that call 826b09c2ec4SVasant Hegde */ 827b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 828b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 829b09c2ec4SVasant Hegde "rc = %d\n", rc); 830b09c2ec4SVasant Hegde } 831608b286dSJeremy Kerr 8329e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 833ed59190eSCyril Bur { 834ed59190eSCyril Bur struct device_node *np; 835ed59190eSCyril Bur 8369e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 83747083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 83847083450SNeelesh Gupta } 83947083450SNeelesh Gupta 8408f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 8418f95faaaSMadhavan Srinivasan { 8428f95faaaSMadhavan Srinivasan struct device_node *np; 8438f95faaaSMadhavan Srinivasan 8448f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 8458f95faaaSMadhavan Srinivasan if (np) 8468f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 8478f95faaaSMadhavan Srinivasan } 8488f95faaaSMadhavan Srinivasan 8493bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 8503bf57561SBenjamin Herrenschmidt { 851a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 8529f0fd049SAlistair Popple 8533bf57561SBenjamin Herrenschmidt set_freezable(); 8543bf57561SBenjamin Herrenschmidt do { 8553bf57561SBenjamin Herrenschmidt try_to_freeze(); 85656c0b48bSNicholas Piggin 85756c0b48bSNicholas Piggin opal_handle_events(); 85856c0b48bSNicholas Piggin 85956c0b48bSNicholas Piggin set_current_state(TASK_INTERRUPTIBLE); 86056c0b48bSNicholas Piggin if (opal_have_pending_events()) 86156c0b48bSNicholas Piggin __set_current_state(TASK_RUNNING); 86256c0b48bSNicholas Piggin else 86356c0b48bSNicholas Piggin schedule_timeout(timeout); 86456c0b48bSNicholas Piggin 8653bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 8663bf57561SBenjamin Herrenschmidt 8673bf57561SBenjamin Herrenschmidt return 0; 8683bf57561SBenjamin Herrenschmidt } 8693bf57561SBenjamin Herrenschmidt 870a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 871a203658bSBenjamin Herrenschmidt { 872a203658bSBenjamin Herrenschmidt if (kopald_tsk) 873a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 874a203658bSBenjamin Herrenschmidt } 875a203658bSBenjamin Herrenschmidt 8763bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 8773bf57561SBenjamin Herrenschmidt { 8783bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 8793bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 8803bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 8813bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 8823bf57561SBenjamin Herrenschmidt 8833bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 884a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 8853bf57561SBenjamin Herrenschmidt } 8863bf57561SBenjamin Herrenschmidt 88714a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 88814a43e69SBenjamin Herrenschmidt { 889c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 890c1c3a526SGavin Shan int rc; 89114a43e69SBenjamin Herrenschmidt 89214a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 89314a43e69SBenjamin Herrenschmidt if (!opal_node) { 89408135139SMichael Ellerman pr_warn("Device node not found\n"); 89514a43e69SBenjamin Herrenschmidt return -ENODEV; 89614a43e69SBenjamin Herrenschmidt } 8972db29d28SBenjamin Herrenschmidt 8982db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 89914a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 9002db29d28SBenjamin Herrenschmidt if (consoles) { 90114a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 9022c8e65b5SRob Herring if (!of_node_name_eq(np, "serial")) 90314a43e69SBenjamin Herrenschmidt continue; 90414a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 90514a43e69SBenjamin Herrenschmidt } 90614a43e69SBenjamin Herrenschmidt of_node_put(consoles); 9072db29d28SBenjamin Herrenschmidt } 908a125e092SBenjamin Herrenschmidt 90996e023e7SAlistair Popple /* Initialise OPAL messaging system */ 91096e023e7SAlistair Popple opal_message_init(); 91196e023e7SAlistair Popple 91296e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 91396e023e7SAlistair Popple opal_async_comp_init(); 91496e023e7SAlistair Popple 91596e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 91696e023e7SAlistair Popple opal_sensor_init(); 91796e023e7SAlistair Popple 91896e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 91996e023e7SAlistair Popple opal_hmi_handler_init(); 92096e023e7SAlistair Popple 92147083450SNeelesh Gupta /* Create i2c platform devices */ 9229e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 92347083450SNeelesh Gupta 9243013e173SOliver O'Halloran /* Handle non-volatile memory devices */ 9253013e173SOliver O'Halloran opal_pdev_init("pmem-region"); 9263013e173SOliver O'Halloran 9273bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 9283bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 9293bf57561SBenjamin Herrenschmidt 9308f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 9318f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 9328f95faaaSMadhavan Srinivasan 933c159b596SVasant Hegde /* Create leds platform devices */ 934c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 935c159b596SVasant Hegde if (leds) { 936c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 937c159b596SVasant Hegde of_node_put(leds); 938c159b596SVasant Hegde } 939c159b596SVasant Hegde 9409b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 9419b4fffa1SAndrew Donnellan opal_msglog_init(); 9429b4fffa1SAndrew Donnellan 9436f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 9446f68b5e2SVasant Hegde rc = opal_sysfs_init(); 94550bd6153SVasant Hegde if (rc == 0) { 946c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 947c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 948b09c2ec4SVasant Hegde /* Setup dump region interface */ 949b09c2ec4SVasant Hegde opal_dump_region_init(); 950774fea1aSStewart Smith /* Setup error log interface */ 951774fea1aSStewart Smith rc = opal_elog_init(); 95250bd6153SVasant Hegde /* Setup code update interface */ 953ed59190eSCyril Bur opal_flash_update_init(); 954c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 955c7e64b9cSStewart Smith opal_platform_dump_init(); 9564029cd66SNeelesh Gupta /* Setup system parameters interface */ 9574029cd66SNeelesh Gupta opal_sys_param_init(); 9589b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 9599b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 96050bd6153SVasant Hegde } 9616f68b5e2SVasant Hegde 96211fe909dSMatt Brown /* Export all properties */ 96311fe909dSMatt Brown opal_export_attrs(); 96411fe909dSMatt Brown 9650d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 9669e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 9679e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 9689e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 969ed59190eSCyril Bur 97043a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 9719e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 97243a1dd9bSSuraj Jitindar Singh 973affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 974affddff6SRussell Currey opal_kmsg_init(); 975affddff6SRussell Currey 976cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 977cb8b340dSShilpasri G Bhat opal_powercap_init(); 978cb8b340dSShilpasri G Bhat 9798e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 9808e84b2d1SShilpasri G Bhat opal_psr_init(); 9818e84b2d1SShilpasri G Bhat 982bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 983bf957155SShilpasri G Bhat opal_sensor_groups_init(); 984bf957155SShilpasri G Bhat 98508fb726dSMahesh Salgaonkar /* Initialise OPAL Power control interface */ 98608fb726dSMahesh Salgaonkar opal_power_control_init(); 98708fb726dSMahesh Salgaonkar 98814a43e69SBenjamin Herrenschmidt return 0; 98914a43e69SBenjamin Herrenschmidt } 990b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 99173ed148aSBenjamin Herrenschmidt 99273ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 99373ed148aSBenjamin Herrenschmidt { 994f7d98d18SVasant Hegde long rc = OPAL_BUSY; 99573ed148aSBenjamin Herrenschmidt 9969f0fd049SAlistair Popple opal_event_shutdown(); 997f7d98d18SVasant Hegde 998f7d98d18SVasant Hegde /* 999f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 1000f7d98d18SVasant Hegde * potentially write to our memory has completed such 1001f7d98d18SVasant Hegde * as an ongoing dump retrieval 1002f7d98d18SVasant Hegde */ 1003f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 1004f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 1005f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 1006f7d98d18SVasant Hegde opal_poll_events(NULL); 1007f7d98d18SVasant Hegde else 1008f7d98d18SVasant Hegde mdelay(10); 1009f7d98d18SVasant Hegde } 1010b09c2ec4SVasant Hegde 1011b09c2ec4SVasant Hegde /* Unregister memory dump region */ 1012b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 1013b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 101473ed148aSBenjamin Herrenschmidt } 1015e28b05e7SJoel Stanley 1016e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 1017e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 1018594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 1019594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 1020608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 1021608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 1022ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 1023ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 1024ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 10250d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 10266e708000SHaren Myneni EXPORT_SYMBOL_GPL(opal_check_token); 10273441f04bSAnton Blanchard 10283441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 10293441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 10303441f04bSAnton Blanchard unsigned long vmalloc_size) 10313441f04bSAnton Blanchard { 10323441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 10333441f04bSAnton Blanchard unsigned long i = 0; 10343441f04bSAnton Blanchard 10353441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 10363441f04bSAnton Blanchard if (!sg) 10373441f04bSAnton Blanchard goto nomem; 10383441f04bSAnton Blanchard 10393441f04bSAnton Blanchard first = sg; 10403441f04bSAnton Blanchard 10413441f04bSAnton Blanchard while (vmalloc_size > 0) { 10423441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 10433441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 10443441f04bSAnton Blanchard 10453441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 10463441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 10473441f04bSAnton Blanchard i++; 10483441f04bSAnton Blanchard 10493441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 10503441f04bSAnton Blanchard struct opal_sg_list *next; 10513441f04bSAnton Blanchard 10523441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 10533441f04bSAnton Blanchard if (!next) 10543441f04bSAnton Blanchard goto nomem; 10553441f04bSAnton Blanchard 10563441f04bSAnton Blanchard sg->length = cpu_to_be64( 10573441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 10583441f04bSAnton Blanchard i = 0; 10593441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 10603441f04bSAnton Blanchard sg = next; 10613441f04bSAnton Blanchard } 10623441f04bSAnton Blanchard 10633441f04bSAnton Blanchard vmalloc_addr += length; 10643441f04bSAnton Blanchard vmalloc_size -= length; 10653441f04bSAnton Blanchard } 10663441f04bSAnton Blanchard 10673441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 10683441f04bSAnton Blanchard 10693441f04bSAnton Blanchard return first; 10703441f04bSAnton Blanchard 10713441f04bSAnton Blanchard nomem: 10723441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 10733441f04bSAnton Blanchard opal_free_sg_list(first); 10743441f04bSAnton Blanchard return NULL; 10753441f04bSAnton Blanchard } 10763441f04bSAnton Blanchard 10773441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 10783441f04bSAnton Blanchard { 10793441f04bSAnton Blanchard while (sg) { 10803441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 10813441f04bSAnton Blanchard 10823441f04bSAnton Blanchard kfree(sg); 10833441f04bSAnton Blanchard 10843441f04bSAnton Blanchard if (next) 10853441f04bSAnton Blanchard sg = __va(next); 10863441f04bSAnton Blanchard else 10873441f04bSAnton Blanchard sg = NULL; 10883441f04bSAnton Blanchard } 10893441f04bSAnton Blanchard } 109016b1d26eSNeelesh Gupta 1091e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 1092e3c5c2e0SCédric Le Goater { 1093e3c5c2e0SCédric Le Goater switch (rc) { 1094e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 1095e3c5c2e0SCédric Le Goater 1096e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 1097e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 109877adbd22SCyril Bur case OPAL_BUSY: 1099e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 1100e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 110114aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 1102e3c5c2e0SCédric Le Goater 1103e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 1104e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 1105e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 1106cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 1107e3c5c2e0SCédric Le Goater default: 1108e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1109e3c5c2e0SCédric Le Goater return -EIO; 1110e3c5c2e0SCédric Le Goater } 1111e3c5c2e0SCédric Le Goater } 1112e3c5c2e0SCédric Le Goater 11131d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 11141d0761d2SAlistair Popple { 11151d0761d2SAlistair Popple int rc; 11161d0761d2SAlistair Popple 11171d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 11181d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 11191d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 11201d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 11211d0761d2SAlistair Popple } 11221d0761d2SAlistair Popple } 11231d0761d2SAlistair Popple 112416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 112516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 112616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 112716b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 112816b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 112947083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 1130c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1131c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1132c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 113343a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 113443a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1135ffe6d810SPaul Mackerras /* Export this for KVM */ 1136ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 11375af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 113877adbd22SCyril Bur EXPORT_SYMBOL_GPL(opal_error_code); 1139656ecc16SHaren Myneni /* Export the below symbol for NX compression */ 1140656ecc16SHaren Myneni EXPORT_SYMBOL(opal_nx_coproc_init); 1141