114a43e69SBenjamin Herrenschmidt /* 214a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 314a43e69SBenjamin Herrenschmidt * 414a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 514a43e69SBenjamin Herrenschmidt * 614a43e69SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 714a43e69SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 814a43e69SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 914a43e69SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1014a43e69SBenjamin Herrenschmidt */ 1114a43e69SBenjamin Herrenschmidt 12c8742f85SBenjamin Herrenschmidt #define pr_fmt(fmt) "opal: " fmt 1314a43e69SBenjamin Herrenschmidt 14c8742f85SBenjamin Herrenschmidt #include <linux/printk.h> 1514a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1614a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1726a2056eSRob Herring #include <linux/of_fdt.h> 1814a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 19a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 201bc98de2SGavin Shan #include <linux/notifier.h> 2173ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 22b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 236f68b5e2SVasant Hegde #include <linux/kobject.h> 24f7d98d18SVasant Hegde #include <linux/delay.h> 2555672ecfSMahesh Salgaonkar #include <linux/memblock.h> 263bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 273bf57561SBenjamin Herrenschmidt #include <linux/freezer.h> 28b14726c5SMichael Ellerman 29b14726c5SMichael Ellerman #include <asm/machdep.h> 3014a43e69SBenjamin Herrenschmidt #include <asm/opal.h> 3114a43e69SBenjamin Herrenschmidt #include <asm/firmware.h> 3236df96f8SMahesh Salgaonkar #include <asm/mce.h> 3314a43e69SBenjamin Herrenschmidt 3414a43e69SBenjamin Herrenschmidt #include "powernv.h" 3514a43e69SBenjamin Herrenschmidt 366f68b5e2SVasant Hegde /* /sys/firmware/opal */ 376f68b5e2SVasant Hegde struct kobject *opal_kobj; 386f68b5e2SVasant Hegde 3914a43e69SBenjamin Herrenschmidt struct opal { 4014a43e69SBenjamin Herrenschmidt u64 base; 4114a43e69SBenjamin Herrenschmidt u64 entry; 4255672ecfSMahesh Salgaonkar u64 size; 4314a43e69SBenjamin Herrenschmidt } opal; 4414a43e69SBenjamin Herrenschmidt 4555672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4655672ecfSMahesh Salgaonkar u64 start_addr; 4755672ecfSMahesh Salgaonkar u64 end_addr; 4855672ecfSMahesh Salgaonkar u64 recover_addr; 4955672ecfSMahesh Salgaonkar }; 5055672ecfSMahesh Salgaonkar 5155672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5255672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5355672ecfSMahesh Salgaonkar 54bfc36894SJoel Stanley struct device_node *opal_node; 5514a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 5624366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 573bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 5814a43e69SBenjamin Herrenschmidt 594926616cSBenjamin Herrenschmidt static void opal_reinit_cores(void) 604926616cSBenjamin Herrenschmidt { 614926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 624926616cSBenjamin Herrenschmidt * 634926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 644926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 654926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 664926616cSBenjamin Herrenschmidt */ 674926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 684926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 694926616cSBenjamin Herrenschmidt #else 704926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 714926616cSBenjamin Herrenschmidt #endif 724926616cSBenjamin Herrenschmidt } 734926616cSBenjamin Herrenschmidt 7414a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 7514a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 7614a43e69SBenjamin Herrenschmidt { 7755672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 789d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 7914a43e69SBenjamin Herrenschmidt 8014a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 8114a43e69SBenjamin Herrenschmidt return 0; 8214a43e69SBenjamin Herrenschmidt 8314a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 8414a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 8555672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 8614a43e69SBenjamin Herrenschmidt 8755672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 8814a43e69SBenjamin Herrenschmidt return 1; 8914a43e69SBenjamin Herrenschmidt 9014a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 9114a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 9255672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 9314a43e69SBenjamin Herrenschmidt 949d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 9514a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 969d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 9714a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 989d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 9955672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 10014a43e69SBenjamin Herrenschmidt 10114a43e69SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPAL; 10275b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 10375b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv2; 10475b93da4SBenjamin Herrenschmidt powerpc_firmware_features |= FW_FEATURE_OPALv3; 1059a4f5cd0SAnton Blanchard pr_info("OPAL V3 detected !\n"); 10614a43e69SBenjamin Herrenschmidt } else { 107786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 10814a43e69SBenjamin Herrenschmidt } 10914a43e69SBenjamin Herrenschmidt 1104926616cSBenjamin Herrenschmidt /* Reinit all cores with the right endian */ 1114926616cSBenjamin Herrenschmidt opal_reinit_cores(); 1124926616cSBenjamin Herrenschmidt 1134926616cSBenjamin Herrenschmidt /* Restore some bits */ 1144926616cSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 1154926616cSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 1164926616cSBenjamin Herrenschmidt 117c4463b37SJeremy Kerr return 1; 118c4463b37SJeremy Kerr } 119c4463b37SJeremy Kerr 12055672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 12155672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 12255672ecfSMahesh Salgaonkar { 1239d0c4dfeSRob Herring int i, psize, size; 12455672ecfSMahesh Salgaonkar const __be32 *prop; 12555672ecfSMahesh Salgaonkar 12655672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 12755672ecfSMahesh Salgaonkar return 0; 12855672ecfSMahesh Salgaonkar 1296e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 13055672ecfSMahesh Salgaonkar 13155672ecfSMahesh Salgaonkar if (!prop) 13255672ecfSMahesh Salgaonkar return 1; 13355672ecfSMahesh Salgaonkar 13455672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 13555672ecfSMahesh Salgaonkar 13655672ecfSMahesh Salgaonkar /* 1376e556b47SMahesh Salgaonkar * Calculate number of available entries. 1386e556b47SMahesh Salgaonkar * 1396e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1406e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1416e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1426e556b47SMahesh Salgaonkar */ 1436e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1446e556b47SMahesh Salgaonkar 1456e556b47SMahesh Salgaonkar /* Sanity check */ 1466e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1476e556b47SMahesh Salgaonkar return 1; 1486e556b47SMahesh Salgaonkar 1496e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1506e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1516e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1526e556b47SMahesh Salgaonkar 1536e556b47SMahesh Salgaonkar /* 15455672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 15555672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 15655672ecfSMahesh Salgaonkar * RMO region. 15755672ecfSMahesh Salgaonkar */ 15855672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 15955672ecfSMahesh Salgaonkar ppc64_rma_size)); 16055672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 16155672ecfSMahesh Salgaonkar 1626e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 16355672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 16455672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 16555672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 16655672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 16755672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 16855672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 16955672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 17055672ecfSMahesh Salgaonkar 17155672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 17255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 17355672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 17455672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 17555672ecfSMahesh Salgaonkar } 17655672ecfSMahesh Salgaonkar return 1; 17755672ecfSMahesh Salgaonkar } 17855672ecfSMahesh Salgaonkar 179c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 180c4463b37SJeremy Kerr { 18129186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 182c4463b37SJeremy Kerr u64 glue; 183c4463b37SJeremy Kerr 184c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 185c4463b37SJeremy Kerr return -ENODEV; 186c4463b37SJeremy Kerr 18728446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 18828446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 189ed79ba9eSBenjamin Herrenschmidt */ 190ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 1916507955cSMahesh Salgaonkar 1926507955cSMahesh Salgaonkar /* 1936507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 1946507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 1956507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 1966507955cSMahesh Salgaonkar * 1976507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 1986507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 1996507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2006507955cSMahesh Salgaonkar * 2016507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2026507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2036507955cSMahesh Salgaonkar */ 2046507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 20508135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2066507955cSMahesh Salgaonkar opal_register_exception_handler( 2076507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2086507955cSMahesh Salgaonkar 0, glue); 2096507955cSMahesh Salgaonkar glue += 128; 2106507955cSMahesh Salgaonkar } 2116507955cSMahesh Salgaonkar 212ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 21329186097SBenjamin Herrenschmidt #endif 214ed79ba9eSBenjamin Herrenschmidt 215c4463b37SJeremy Kerr return 0; 21614a43e69SBenjamin Herrenschmidt } 217b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 218c4463b37SJeremy Kerr 21924366360SMahesh Salgaonkar /* 22024366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 22124366360SMahesh Salgaonkar * notified for specific messgae type. 22224366360SMahesh Salgaonkar */ 223d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 22424366360SMahesh Salgaonkar struct notifier_block *nb) 22524366360SMahesh Salgaonkar { 226792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 227792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 22824366360SMahesh Salgaonkar __func__, msg_type); 22924366360SMahesh Salgaonkar return -EINVAL; 23024366360SMahesh Salgaonkar } 231792f96e9SNeelesh Gupta 23224366360SMahesh Salgaonkar return atomic_notifier_chain_register( 23324366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 23424366360SMahesh Salgaonkar } 235594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 23624366360SMahesh Salgaonkar 237df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 238b921e902SNeelesh Gupta struct notifier_block *nb) 239b921e902SNeelesh Gupta { 240b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 241b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 242b921e902SNeelesh Gupta } 243594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 244b921e902SNeelesh Gupta 24524366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 24624366360SMahesh Salgaonkar { 24724366360SMahesh Salgaonkar /* notify subscribers */ 24824366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 24924366360SMahesh Salgaonkar msg_type, msg); 25024366360SMahesh Salgaonkar } 25124366360SMahesh Salgaonkar 25224366360SMahesh Salgaonkar static void opal_handle_message(void) 25324366360SMahesh Salgaonkar { 25424366360SMahesh Salgaonkar s64 ret; 25524366360SMahesh Salgaonkar /* 25624366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 25724366360SMahesh Salgaonkar * value in /proc/device-tree. 25824366360SMahesh Salgaonkar */ 25924366360SMahesh Salgaonkar static struct opal_msg msg; 260bb4398e1SAnton Blanchard u32 type; 26124366360SMahesh Salgaonkar 26224366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 26324366360SMahesh Salgaonkar /* No opal message pending. */ 26424366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 26524366360SMahesh Salgaonkar return; 26624366360SMahesh Salgaonkar 26724366360SMahesh Salgaonkar /* check for errors. */ 26824366360SMahesh Salgaonkar if (ret) { 2691a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 27024366360SMahesh Salgaonkar __func__, ret); 27124366360SMahesh Salgaonkar return; 27224366360SMahesh Salgaonkar } 27324366360SMahesh Salgaonkar 274bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 275bb4398e1SAnton Blanchard 27624366360SMahesh Salgaonkar /* Sanity check */ 277792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 278bb4398e1SAnton Blanchard pr_warning("%s: Unknown message type: %u\n", __func__, type); 27924366360SMahesh Salgaonkar return; 28024366360SMahesh Salgaonkar } 281bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 28224366360SMahesh Salgaonkar } 28324366360SMahesh Salgaonkar 284a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 28524366360SMahesh Salgaonkar { 28624366360SMahesh Salgaonkar opal_handle_message(); 287a295af24SAlistair Popple return IRQ_HANDLED; 28824366360SMahesh Salgaonkar } 28924366360SMahesh Salgaonkar 29024366360SMahesh Salgaonkar static int __init opal_message_init(void) 29124366360SMahesh Salgaonkar { 292a295af24SAlistair Popple int ret, i, irq; 29324366360SMahesh Salgaonkar 29424366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 29524366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 29624366360SMahesh Salgaonkar 297a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 298a295af24SAlistair Popple if (!irq) { 299a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 300a295af24SAlistair Popple __func__, irq); 301a295af24SAlistair Popple return irq; 302a295af24SAlistair Popple } 303a295af24SAlistair Popple 304a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 305a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 30624366360SMahesh Salgaonkar if (ret) { 307a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 30824366360SMahesh Salgaonkar __func__, ret); 30924366360SMahesh Salgaonkar return ret; 31024366360SMahesh Salgaonkar } 311a295af24SAlistair Popple 31224366360SMahesh Salgaonkar return 0; 31324366360SMahesh Salgaonkar } 31424366360SMahesh Salgaonkar 31514a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 31614a43e69SBenjamin Herrenschmidt { 3174f89363bSBenjamin Herrenschmidt s64 rc; 3184f89363bSBenjamin Herrenschmidt __be64 evt, len; 31914a43e69SBenjamin Herrenschmidt 32014a43e69SBenjamin Herrenschmidt if (!opal.entry) 321daea1175SBenjamin Herrenschmidt return -ENODEV; 32214a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3234f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 32414a43e69SBenjamin Herrenschmidt return 0; 3254f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 32614a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 32714a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3284f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 32914a43e69SBenjamin Herrenschmidt return 0; 33014a43e69SBenjamin Herrenschmidt } 33114a43e69SBenjamin Herrenschmidt 33214a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 33314a43e69SBenjamin Herrenschmidt { 33414a43e69SBenjamin Herrenschmidt int written = 0; 3354f89363bSBenjamin Herrenschmidt __be64 olen; 336daea1175SBenjamin Herrenschmidt s64 len, rc; 33714a43e69SBenjamin Herrenschmidt unsigned long flags; 3384f89363bSBenjamin Herrenschmidt __be64 evt; 33914a43e69SBenjamin Herrenschmidt 34014a43e69SBenjamin Herrenschmidt if (!opal.entry) 341daea1175SBenjamin Herrenschmidt return -ENODEV; 34214a43e69SBenjamin Herrenschmidt 34314a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 34414a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 345daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 346daea1175SBenjamin Herrenschmidt * 347daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 348daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 349daea1175SBenjamin Herrenschmidt * enough room and be done with it 35014a43e69SBenjamin Herrenschmidt */ 35114a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 352daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) { 3534f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3544f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 35514a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 35614a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 35714a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 35814a43e69SBenjamin Herrenschmidt if (rc) 35914a43e69SBenjamin Herrenschmidt return total_len; 3604f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 36114a43e69SBenjamin Herrenschmidt return -EAGAIN; 36214a43e69SBenjamin Herrenschmidt } 363daea1175SBenjamin Herrenschmidt } 36414a43e69SBenjamin Herrenschmidt 36514a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 36614a43e69SBenjamin Herrenschmidt * should no longer happen. 36714a43e69SBenjamin Herrenschmidt */ 368daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 36914a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 37014a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3714f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3724f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3734f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3741de1455fSBenjamin Herrenschmidt 3751de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3761de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3771de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3781de1455fSBenjamin Herrenschmidt written = total_len; 3791de1455fSBenjamin Herrenschmidt break; 3801de1455fSBenjamin Herrenschmidt } 38114a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 38214a43e69SBenjamin Herrenschmidt total_len -= len; 38314a43e69SBenjamin Herrenschmidt data += len; 38414a43e69SBenjamin Herrenschmidt written += len; 38514a43e69SBenjamin Herrenschmidt } 38614a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 38714a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 38814a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 38914a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 39014a43e69SBenjamin Herrenschmidt */ 39114a43e69SBenjamin Herrenschmidt do 39214a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3934f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 3944f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 39514a43e69SBenjamin Herrenschmidt } 39614a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 39714a43e69SBenjamin Herrenschmidt return written; 39814a43e69SBenjamin Herrenschmidt } 39914a43e69SBenjamin Herrenschmidt 400b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 401b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 402b63a0ffeSMahesh Salgaonkar { 403b63a0ffeSMahesh Salgaonkar int recovered = 0; 404b63a0ffeSMahesh Salgaonkar uint64_t ea = get_mce_fault_addr(evt); 405b63a0ffeSMahesh Salgaonkar 406b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 407b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 408b63a0ffeSMahesh Salgaonkar recovered = 0; 409b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 410b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 411b63a0ffeSMahesh Salgaonkar recovered = 1; 412b63a0ffeSMahesh Salgaonkar } else if (ea && !is_kernel_addr(ea)) { 413b63a0ffeSMahesh Salgaonkar /* 414b63a0ffeSMahesh Salgaonkar * Faulting address is not in kernel text. We should be fine. 415b63a0ffeSMahesh Salgaonkar * We need to find which process uses this address. 416b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 417b63a0ffeSMahesh Salgaonkar * in userspace. 418b63a0ffeSMahesh Salgaonkar * 419b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 420b63a0ffeSMahesh Salgaonkar */ 421b63a0ffeSMahesh Salgaonkar if (user_mode(regs) && !is_global_init(current)) { 422b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 423b63a0ffeSMahesh Salgaonkar recovered = 1; 424b63a0ffeSMahesh Salgaonkar } else 425b63a0ffeSMahesh Salgaonkar recovered = 0; 426b63a0ffeSMahesh Salgaonkar } else if (user_mode(regs) && !is_global_init(current) && 427b63a0ffeSMahesh Salgaonkar evt->severity == MCE_SEV_ERROR_SYNC) { 428b63a0ffeSMahesh Salgaonkar /* 429b63a0ffeSMahesh Salgaonkar * If we have received a synchronous error when in userspace 430b63a0ffeSMahesh Salgaonkar * kill the task. 431b63a0ffeSMahesh Salgaonkar */ 432b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 433b63a0ffeSMahesh Salgaonkar recovered = 1; 434b63a0ffeSMahesh Salgaonkar } 435b63a0ffeSMahesh Salgaonkar return recovered; 436b63a0ffeSMahesh Salgaonkar } 437b63a0ffeSMahesh Salgaonkar 438ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 439ed79ba9eSBenjamin Herrenschmidt { 44036df96f8SMahesh Salgaonkar struct machine_check_event evt; 441e784b649SMahesh Salgaonkar int ret; 442ed79ba9eSBenjamin Herrenschmidt 44336df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 44436df96f8SMahesh Salgaonkar return 0; 445ed79ba9eSBenjamin Herrenschmidt 446ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 44736df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 448ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 449ed79ba9eSBenjamin Herrenschmidt evt.version); 450ed79ba9eSBenjamin Herrenschmidt return 0; 451ed79ba9eSBenjamin Herrenschmidt } 452b5ff4211SMahesh Salgaonkar machine_check_print_event_info(&evt); 453ed79ba9eSBenjamin Herrenschmidt 454b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 455b63a0ffeSMahesh Salgaonkar return 1; 456e784b649SMahesh Salgaonkar 457e784b649SMahesh Salgaonkar /* 458e784b649SMahesh Salgaonkar * Unrecovered machine check, we are heading to panic path. 459e784b649SMahesh Salgaonkar * 460e784b649SMahesh Salgaonkar * We may have hit this MCE in very early stage of kernel 461e784b649SMahesh Salgaonkar * initialization even before opal-prd has started running. If 462e784b649SMahesh Salgaonkar * this is the case then this MCE error may go un-noticed or 463e784b649SMahesh Salgaonkar * un-analyzed if we go down panic path. We need to inform 464e784b649SMahesh Salgaonkar * BMC/OCC about this error so that they can collect relevant 465e784b649SMahesh Salgaonkar * data for error analysis before rebooting. 466e784b649SMahesh Salgaonkar * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 467e784b649SMahesh Salgaonkar * This function may not return on BMC based system. 468e784b649SMahesh Salgaonkar */ 469e784b649SMahesh Salgaonkar ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 470e784b649SMahesh Salgaonkar "Unrecoverable Machine Check exception"); 471e784b649SMahesh Salgaonkar if (ret == OPAL_UNSUPPORTED) { 472e784b649SMahesh Salgaonkar pr_emerg("Reboot type %d not supported\n", 473e784b649SMahesh Salgaonkar OPAL_REBOOT_PLATFORM_ERROR); 474e784b649SMahesh Salgaonkar } 475e784b649SMahesh Salgaonkar 476e784b649SMahesh Salgaonkar /* 477e784b649SMahesh Salgaonkar * We reached here. There can be three possibilities: 478e784b649SMahesh Salgaonkar * 1. We are running on a firmware level that do not support 479e784b649SMahesh Salgaonkar * opal_cec_reboot2() 480e784b649SMahesh Salgaonkar * 2. We are running on a firmware level that do not support 481e784b649SMahesh Salgaonkar * OPAL_REBOOT_PLATFORM_ERROR reboot type. 482e784b649SMahesh Salgaonkar * 3. We are running on FSP based system that does not need opal 483e784b649SMahesh Salgaonkar * to trigger checkstop explicitly for error analysis. The FSP 484e784b649SMahesh Salgaonkar * PRD component would have already got notified about this 485e784b649SMahesh Salgaonkar * error through other channels. 486e784b649SMahesh Salgaonkar * 487f2dd80ecSDaniel Axtens * If hardware marked this as an unrecoverable MCE, we are 488f2dd80ecSDaniel Axtens * going to panic anyway. Even if it didn't, it's not safe to 489f2dd80ecSDaniel Axtens * continue at this point, so we should explicitly panic. 490e784b649SMahesh Salgaonkar */ 491f2dd80ecSDaniel Axtens 492f2dd80ecSDaniel Axtens panic("PowerNV Unrecovered Machine Check"); 493b63a0ffeSMahesh Salgaonkar return 0; 494ed79ba9eSBenjamin Herrenschmidt } 495ed79ba9eSBenjamin Herrenschmidt 4960869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 4970869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 4980869b6fdSMahesh Salgaonkar { 4990ef95b41SMahesh Salgaonkar s64 rc; 5000ef95b41SMahesh Salgaonkar 5010ef95b41SMahesh Salgaonkar /* 5020ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5030ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5040ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5050ef95b41SMahesh Salgaonkar */ 5060ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5070ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5080ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5090ef95b41SMahesh Salgaonkar return 1; 5100ef95b41SMahesh Salgaonkar } 5110869b6fdSMahesh Salgaonkar return 0; 5120869b6fdSMahesh Salgaonkar } 5130869b6fdSMahesh Salgaonkar 5140869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5150869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5160869b6fdSMahesh Salgaonkar { 5170ef95b41SMahesh Salgaonkar s64 rc; 5180ef95b41SMahesh Salgaonkar __be64 evt = 0; 5190ef95b41SMahesh Salgaonkar 5200ef95b41SMahesh Salgaonkar /* 5210ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5220ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5230ef95b41SMahesh Salgaonkar * process them. 5240ef95b41SMahesh Salgaonkar */ 5250ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5260869b6fdSMahesh Salgaonkar return 0; 5270ef95b41SMahesh Salgaonkar 5280ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5290ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 53081f2f7ceSAlistair Popple if (rc == OPAL_SUCCESS && evt) 5319f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(evt)); 5320ef95b41SMahesh Salgaonkar 5330ef95b41SMahesh Salgaonkar return 1; 5340869b6fdSMahesh Salgaonkar } 5350869b6fdSMahesh Salgaonkar 53655672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 53755672ecfSMahesh Salgaonkar { 53855672ecfSMahesh Salgaonkar int i; 53955672ecfSMahesh Salgaonkar 54055672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 54155672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 54255672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 54355672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 54455672ecfSMahesh Salgaonkar return 0; 54555672ecfSMahesh Salgaonkar } 54655672ecfSMahesh Salgaonkar 54755672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 54855672ecfSMahesh Salgaonkar { 54955672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 55055672ecfSMahesh Salgaonkar 55155672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 55255672ecfSMahesh Salgaonkar goto out; 55355672ecfSMahesh Salgaonkar 55455672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 55555672ecfSMahesh Salgaonkar (regs->nip <= (opal.base + opal.size))) 55655672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 55755672ecfSMahesh Salgaonkar 55855672ecfSMahesh Salgaonkar /* 55955672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 56055672ecfSMahesh Salgaonkar */ 56155672ecfSMahesh Salgaonkar if (recover_addr) 56255672ecfSMahesh Salgaonkar regs->nip = recover_addr; 56355672ecfSMahesh Salgaonkar 56455672ecfSMahesh Salgaonkar out: 56555672ecfSMahesh Salgaonkar return !!recover_addr; 56655672ecfSMahesh Salgaonkar } 56755672ecfSMahesh Salgaonkar 5686f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5696f68b5e2SVasant Hegde { 5706f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5716f68b5e2SVasant Hegde if (!opal_kobj) { 5726f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5736f68b5e2SVasant Hegde return -ENOMEM; 5746f68b5e2SVasant Hegde } 5756f68b5e2SVasant Hegde 5766f68b5e2SVasant Hegde return 0; 5776f68b5e2SVasant Hegde } 5786f68b5e2SVasant Hegde 579c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 580c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 581c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 582c8742f85SBenjamin Herrenschmidt { 583c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 584c8742f85SBenjamin Herrenschmidt bin_attr->size); 585c8742f85SBenjamin Herrenschmidt } 586c8742f85SBenjamin Herrenschmidt 587c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 588c8742f85SBenjamin Herrenschmidt 589c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 590c8742f85SBenjamin Herrenschmidt { 591c8742f85SBenjamin Herrenschmidt const __be64 *syms; 592c8742f85SBenjamin Herrenschmidt unsigned int size; 593c8742f85SBenjamin Herrenschmidt struct device_node *fw; 594c8742f85SBenjamin Herrenschmidt int rc; 595c8742f85SBenjamin Herrenschmidt 596c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 597c8742f85SBenjamin Herrenschmidt if (!fw) 598c8742f85SBenjamin Herrenschmidt return; 599c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 600c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 601c8742f85SBenjamin Herrenschmidt return; 602c8742f85SBenjamin Herrenschmidt 603c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 604c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 605c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 606c8742f85SBenjamin Herrenschmidt 607c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 608c8742f85SBenjamin Herrenschmidt if (rc) 609c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 610c8742f85SBenjamin Herrenschmidt } 611c8742f85SBenjamin Herrenschmidt 612b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 613b09c2ec4SVasant Hegde { 614b09c2ec4SVasant Hegde void *addr; 615b09c2ec4SVasant Hegde uint64_t size; 616b09c2ec4SVasant Hegde int rc; 617b09c2ec4SVasant Hegde 618b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 619b962f5a4SStewart Smith return; 620b962f5a4SStewart Smith 621b09c2ec4SVasant Hegde /* Register kernel log buffer */ 622b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 6236501ab5eSPranith Kumar if (addr == NULL) 6246501ab5eSPranith Kumar return; 6256501ab5eSPranith Kumar 626b09c2ec4SVasant Hegde size = log_buf_len_get(); 6276501ab5eSPranith Kumar if (size == 0) 6286501ab5eSPranith Kumar return; 6296501ab5eSPranith Kumar 630b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 631b09c2ec4SVasant Hegde __pa(addr), size); 632b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 633b09c2ec4SVasant Hegde * know about that call 634b09c2ec4SVasant Hegde */ 635b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 636b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 637b09c2ec4SVasant Hegde "rc = %d\n", rc); 638b09c2ec4SVasant Hegde } 639608b286dSJeremy Kerr 64048c06154SJeremy Kerr static void opal_pdev_init(struct device_node *opal_node, 64148c06154SJeremy Kerr const char *compatible) 642ed59190eSCyril Bur { 643ed59190eSCyril Bur struct device_node *np; 644ed59190eSCyril Bur 645ed59190eSCyril Bur for_each_child_of_node(opal_node, np) 64648c06154SJeremy Kerr if (of_device_is_compatible(np, compatible)) 647608b286dSJeremy Kerr of_platform_device_create(np, NULL, NULL); 648608b286dSJeremy Kerr } 649608b286dSJeremy Kerr 65047083450SNeelesh Gupta static void opal_i2c_create_devs(void) 65147083450SNeelesh Gupta { 65247083450SNeelesh Gupta struct device_node *np; 65347083450SNeelesh Gupta 65447083450SNeelesh Gupta for_each_compatible_node(np, NULL, "ibm,opal-i2c") 65547083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 65647083450SNeelesh Gupta } 65747083450SNeelesh Gupta 6583bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 6593bf57561SBenjamin Herrenschmidt { 6609f0fd049SAlistair Popple __be64 events; 6619f0fd049SAlistair Popple 6623bf57561SBenjamin Herrenschmidt set_freezable(); 6633bf57561SBenjamin Herrenschmidt do { 6643bf57561SBenjamin Herrenschmidt try_to_freeze(); 6659f0fd049SAlistair Popple opal_poll_events(&events); 6669f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(events)); 6673bf57561SBenjamin Herrenschmidt msleep_interruptible(opal_heartbeat); 6683bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 6693bf57561SBenjamin Herrenschmidt 6703bf57561SBenjamin Herrenschmidt return 0; 6713bf57561SBenjamin Herrenschmidt } 6723bf57561SBenjamin Herrenschmidt 6733bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 6743bf57561SBenjamin Herrenschmidt { 6753bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 6763bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 6773bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 6783bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 6793bf57561SBenjamin Herrenschmidt 6803bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 6813bf57561SBenjamin Herrenschmidt kthread_run(kopald, NULL, "kopald"); 6823bf57561SBenjamin Herrenschmidt } 6833bf57561SBenjamin Herrenschmidt 68414a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 68514a43e69SBenjamin Herrenschmidt { 686c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 687c1c3a526SGavin Shan int rc; 68814a43e69SBenjamin Herrenschmidt 68914a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 69014a43e69SBenjamin Herrenschmidt if (!opal_node) { 69108135139SMichael Ellerman pr_warn("Device node not found\n"); 69214a43e69SBenjamin Herrenschmidt return -ENODEV; 69314a43e69SBenjamin Herrenschmidt } 6942db29d28SBenjamin Herrenschmidt 6952db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 69614a43e69SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPALv2)) 69714a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 69814a43e69SBenjamin Herrenschmidt else 69914a43e69SBenjamin Herrenschmidt consoles = of_node_get(opal_node); 7002db29d28SBenjamin Herrenschmidt if (consoles) { 70114a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 70214a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 70314a43e69SBenjamin Herrenschmidt continue; 70414a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 70514a43e69SBenjamin Herrenschmidt } 70614a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7072db29d28SBenjamin Herrenschmidt } 708a125e092SBenjamin Herrenschmidt 70996e023e7SAlistair Popple /* Initialise OPAL messaging system */ 71096e023e7SAlistair Popple opal_message_init(); 71196e023e7SAlistair Popple 71296e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 71396e023e7SAlistair Popple opal_async_comp_init(); 71496e023e7SAlistair Popple 71596e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 71696e023e7SAlistair Popple opal_sensor_init(); 71796e023e7SAlistair Popple 71896e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 71996e023e7SAlistair Popple opal_hmi_handler_init(); 72096e023e7SAlistair Popple 72147083450SNeelesh Gupta /* Create i2c platform devices */ 72247083450SNeelesh Gupta opal_i2c_create_devs(); 72347083450SNeelesh Gupta 7243bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 7253bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 7263bf57561SBenjamin Herrenschmidt 727c159b596SVasant Hegde /* Create leds platform devices */ 728c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 729c159b596SVasant Hegde if (leds) { 730c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 731c159b596SVasant Hegde of_node_put(leds); 732c159b596SVasant Hegde } 733c159b596SVasant Hegde 7346f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 7356f68b5e2SVasant Hegde rc = opal_sysfs_init(); 73650bd6153SVasant Hegde if (rc == 0) { 737c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 738c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 739b09c2ec4SVasant Hegde /* Setup dump region interface */ 740b09c2ec4SVasant Hegde opal_dump_region_init(); 741774fea1aSStewart Smith /* Setup error log interface */ 742774fea1aSStewart Smith rc = opal_elog_init(); 74350bd6153SVasant Hegde /* Setup code update interface */ 744ed59190eSCyril Bur opal_flash_update_init(); 745c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 746c7e64b9cSStewart Smith opal_platform_dump_init(); 7474029cd66SNeelesh Gupta /* Setup system parameters interface */ 7484029cd66SNeelesh Gupta opal_sys_param_init(); 749bfc36894SJoel Stanley /* Setup message log interface. */ 750bfc36894SJoel Stanley opal_msglog_init(); 75150bd6153SVasant Hegde } 7526f68b5e2SVasant Hegde 7530d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 75448c06154SJeremy Kerr opal_pdev_init(opal_node, "ibm,opal-ipmi"); 75548c06154SJeremy Kerr opal_pdev_init(opal_node, "ibm,opal-flash"); 7560d7cd855SJeremy Kerr opal_pdev_init(opal_node, "ibm,opal-prd"); 757ed59190eSCyril Bur 75814a43e69SBenjamin Herrenschmidt return 0; 75914a43e69SBenjamin Herrenschmidt } 760b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 76173ed148aSBenjamin Herrenschmidt 76273ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 76373ed148aSBenjamin Herrenschmidt { 764f7d98d18SVasant Hegde long rc = OPAL_BUSY; 76573ed148aSBenjamin Herrenschmidt 7669f0fd049SAlistair Popple opal_event_shutdown(); 767f7d98d18SVasant Hegde 768f7d98d18SVasant Hegde /* 769f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 770f7d98d18SVasant Hegde * potentially write to our memory has completed such 771f7d98d18SVasant Hegde * as an ongoing dump retrieval 772f7d98d18SVasant Hegde */ 773f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 774f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 775f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 776f7d98d18SVasant Hegde opal_poll_events(NULL); 777f7d98d18SVasant Hegde else 778f7d98d18SVasant Hegde mdelay(10); 779f7d98d18SVasant Hegde } 780b09c2ec4SVasant Hegde 781b09c2ec4SVasant Hegde /* Unregister memory dump region */ 782b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 783b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 78473ed148aSBenjamin Herrenschmidt } 785e28b05e7SJoel Stanley 786e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 787e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 788594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 789594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 790608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 791608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 792ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 793ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 794ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 7950d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 7963441f04bSAnton Blanchard 7973441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 7983441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 7993441f04bSAnton Blanchard unsigned long vmalloc_size) 8003441f04bSAnton Blanchard { 8013441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 8023441f04bSAnton Blanchard unsigned long i = 0; 8033441f04bSAnton Blanchard 8043441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 8053441f04bSAnton Blanchard if (!sg) 8063441f04bSAnton Blanchard goto nomem; 8073441f04bSAnton Blanchard 8083441f04bSAnton Blanchard first = sg; 8093441f04bSAnton Blanchard 8103441f04bSAnton Blanchard while (vmalloc_size > 0) { 8113441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 8123441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 8133441f04bSAnton Blanchard 8143441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 8153441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 8163441f04bSAnton Blanchard i++; 8173441f04bSAnton Blanchard 8183441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 8193441f04bSAnton Blanchard struct opal_sg_list *next; 8203441f04bSAnton Blanchard 8213441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 8223441f04bSAnton Blanchard if (!next) 8233441f04bSAnton Blanchard goto nomem; 8243441f04bSAnton Blanchard 8253441f04bSAnton Blanchard sg->length = cpu_to_be64( 8263441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 8273441f04bSAnton Blanchard i = 0; 8283441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 8293441f04bSAnton Blanchard sg = next; 8303441f04bSAnton Blanchard } 8313441f04bSAnton Blanchard 8323441f04bSAnton Blanchard vmalloc_addr += length; 8333441f04bSAnton Blanchard vmalloc_size -= length; 8343441f04bSAnton Blanchard } 8353441f04bSAnton Blanchard 8363441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 8373441f04bSAnton Blanchard 8383441f04bSAnton Blanchard return first; 8393441f04bSAnton Blanchard 8403441f04bSAnton Blanchard nomem: 8413441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 8423441f04bSAnton Blanchard opal_free_sg_list(first); 8433441f04bSAnton Blanchard return NULL; 8443441f04bSAnton Blanchard } 8453441f04bSAnton Blanchard 8463441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 8473441f04bSAnton Blanchard { 8483441f04bSAnton Blanchard while (sg) { 8493441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 8503441f04bSAnton Blanchard 8513441f04bSAnton Blanchard kfree(sg); 8523441f04bSAnton Blanchard 8533441f04bSAnton Blanchard if (next) 8543441f04bSAnton Blanchard sg = __va(next); 8553441f04bSAnton Blanchard else 8563441f04bSAnton Blanchard sg = NULL; 8573441f04bSAnton Blanchard } 8583441f04bSAnton Blanchard } 85916b1d26eSNeelesh Gupta 860e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 861e3c5c2e0SCédric Le Goater { 862e3c5c2e0SCédric Le Goater switch (rc) { 863e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 864e3c5c2e0SCédric Le Goater 865e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 866e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 867e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 868e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 86914aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 870e3c5c2e0SCédric Le Goater 871e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 872e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 873e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 874e3c5c2e0SCédric Le Goater default: 875e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 876e3c5c2e0SCédric Le Goater return -EIO; 877e3c5c2e0SCédric Le Goater } 878e3c5c2e0SCédric Le Goater } 879e3c5c2e0SCédric Le Goater 88016b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 88116b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 88216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 88316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 88416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 88547083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 886c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 887c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 888c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 889