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; 58a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 5914a43e69SBenjamin Herrenschmidt 60d3cbff1bSBenjamin Herrenschmidt void opal_configure_cores(void) 614926616cSBenjamin Herrenschmidt { 621c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 631c0eaf0fSBenjamin Herrenschmidt 644926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 654926616cSBenjamin Herrenschmidt * 664926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 674926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 684926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 694926616cSBenjamin Herrenschmidt */ 704926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 711c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 724926616cSBenjamin Herrenschmidt #else 731c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 744926616cSBenjamin Herrenschmidt #endif 75d3cbff1bSBenjamin Herrenschmidt 761c0eaf0fSBenjamin Herrenschmidt /* 771c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 781c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 791c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 801c0eaf0fSBenjamin Herrenschmidt */ 81a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 821c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 831c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 841c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 851c0eaf0fSBenjamin Herrenschmidt } 861c0eaf0fSBenjamin Herrenschmidt 871c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 881c0eaf0fSBenjamin Herrenschmidt 89d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 90d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 91d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 924926616cSBenjamin Herrenschmidt } 934926616cSBenjamin Herrenschmidt 9414a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 9514a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 9614a43e69SBenjamin Herrenschmidt { 9755672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 989d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 9914a43e69SBenjamin Herrenschmidt 10014a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10114a43e69SBenjamin Herrenschmidt return 0; 10214a43e69SBenjamin Herrenschmidt 10314a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 10414a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 10555672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 10614a43e69SBenjamin Herrenschmidt 10755672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 10814a43e69SBenjamin Herrenschmidt return 1; 10914a43e69SBenjamin Herrenschmidt 11014a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 11114a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 11255672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 11314a43e69SBenjamin Herrenschmidt 1149d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 11514a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1169d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 11714a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1189d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 11955672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 12014a43e69SBenjamin Herrenschmidt 12175b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 122e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 123e4d54f71SStewart Smith pr_info("OPAL detected !\n"); 12414a43e69SBenjamin Herrenschmidt } else { 125786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 12614a43e69SBenjamin Herrenschmidt } 12714a43e69SBenjamin Herrenschmidt 128c4463b37SJeremy Kerr return 1; 129c4463b37SJeremy Kerr } 130c4463b37SJeremy Kerr 13155672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13255672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 13355672ecfSMahesh Salgaonkar { 1349d0c4dfeSRob Herring int i, psize, size; 13555672ecfSMahesh Salgaonkar const __be32 *prop; 13655672ecfSMahesh Salgaonkar 13755672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 13855672ecfSMahesh Salgaonkar return 0; 13955672ecfSMahesh Salgaonkar 1406e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 14155672ecfSMahesh Salgaonkar 14255672ecfSMahesh Salgaonkar if (!prop) 14355672ecfSMahesh Salgaonkar return 1; 14455672ecfSMahesh Salgaonkar 14555672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 14655672ecfSMahesh Salgaonkar 14755672ecfSMahesh Salgaonkar /* 1486e556b47SMahesh Salgaonkar * Calculate number of available entries. 1496e556b47SMahesh Salgaonkar * 1506e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1516e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1526e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1536e556b47SMahesh Salgaonkar */ 1546e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1556e556b47SMahesh Salgaonkar 1566e556b47SMahesh Salgaonkar /* Sanity check */ 1576e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1586e556b47SMahesh Salgaonkar return 1; 1596e556b47SMahesh Salgaonkar 1606e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1616e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1626e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1636e556b47SMahesh Salgaonkar 1646e556b47SMahesh Salgaonkar /* 16555672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 16655672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 16755672ecfSMahesh Salgaonkar * RMO region. 16855672ecfSMahesh Salgaonkar */ 16955672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 17055672ecfSMahesh Salgaonkar ppc64_rma_size)); 17155672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 17255672ecfSMahesh Salgaonkar 1736e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17455672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17555672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 17655672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 17755672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 17855672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 17955672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 18055672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 18155672ecfSMahesh Salgaonkar 18255672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18355672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18455672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18555672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 18655672ecfSMahesh Salgaonkar } 18755672ecfSMahesh Salgaonkar return 1; 18855672ecfSMahesh Salgaonkar } 18955672ecfSMahesh Salgaonkar 190c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 191c4463b37SJeremy Kerr { 19229186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 193c4463b37SJeremy Kerr u64 glue; 194c4463b37SJeremy Kerr 195c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 196c4463b37SJeremy Kerr return -ENODEV; 197c4463b37SJeremy Kerr 19828446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 19928446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 200ed79ba9eSBenjamin Herrenschmidt */ 201ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2026507955cSMahesh Salgaonkar 2036507955cSMahesh Salgaonkar /* 2046507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 2056507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 2066507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 2076507955cSMahesh Salgaonkar * 2086507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 2096507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 2106507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 2116507955cSMahesh Salgaonkar * 2126507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 2136507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 2146507955cSMahesh Salgaonkar */ 2156507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 21608135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2176507955cSMahesh Salgaonkar opal_register_exception_handler( 2186507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2196507955cSMahesh Salgaonkar 0, glue); 2206507955cSMahesh Salgaonkar glue += 128; 2216507955cSMahesh Salgaonkar } 2226507955cSMahesh Salgaonkar 223ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 22429186097SBenjamin Herrenschmidt #endif 225ed79ba9eSBenjamin Herrenschmidt 226c4463b37SJeremy Kerr return 0; 22714a43e69SBenjamin Herrenschmidt } 228b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 229c4463b37SJeremy Kerr 23024366360SMahesh Salgaonkar /* 23124366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 23224366360SMahesh Salgaonkar * notified for specific messgae type. 23324366360SMahesh Salgaonkar */ 234d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 23524366360SMahesh Salgaonkar struct notifier_block *nb) 23624366360SMahesh Salgaonkar { 237792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 238792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 23924366360SMahesh Salgaonkar __func__, msg_type); 24024366360SMahesh Salgaonkar return -EINVAL; 24124366360SMahesh Salgaonkar } 242792f96e9SNeelesh Gupta 24324366360SMahesh Salgaonkar return atomic_notifier_chain_register( 24424366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 24524366360SMahesh Salgaonkar } 246594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 24724366360SMahesh Salgaonkar 248df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 249b921e902SNeelesh Gupta struct notifier_block *nb) 250b921e902SNeelesh Gupta { 251b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 252b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 253b921e902SNeelesh Gupta } 254594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 255b921e902SNeelesh Gupta 25624366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 25724366360SMahesh Salgaonkar { 25824366360SMahesh Salgaonkar /* notify subscribers */ 25924366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 26024366360SMahesh Salgaonkar msg_type, msg); 26124366360SMahesh Salgaonkar } 26224366360SMahesh Salgaonkar 26324366360SMahesh Salgaonkar static void opal_handle_message(void) 26424366360SMahesh Salgaonkar { 26524366360SMahesh Salgaonkar s64 ret; 26624366360SMahesh Salgaonkar /* 26724366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 26824366360SMahesh Salgaonkar * value in /proc/device-tree. 26924366360SMahesh Salgaonkar */ 27024366360SMahesh Salgaonkar static struct opal_msg msg; 271bb4398e1SAnton Blanchard u32 type; 27224366360SMahesh Salgaonkar 27324366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 27424366360SMahesh Salgaonkar /* No opal message pending. */ 27524366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 27624366360SMahesh Salgaonkar return; 27724366360SMahesh Salgaonkar 27824366360SMahesh Salgaonkar /* check for errors. */ 27924366360SMahesh Salgaonkar if (ret) { 2801a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 28124366360SMahesh Salgaonkar __func__, ret); 28224366360SMahesh Salgaonkar return; 28324366360SMahesh Salgaonkar } 28424366360SMahesh Salgaonkar 285bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 286bb4398e1SAnton Blanchard 28724366360SMahesh Salgaonkar /* Sanity check */ 288792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 28998da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 29024366360SMahesh Salgaonkar return; 29124366360SMahesh Salgaonkar } 292bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 29324366360SMahesh Salgaonkar } 29424366360SMahesh Salgaonkar 295a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 29624366360SMahesh Salgaonkar { 29724366360SMahesh Salgaonkar opal_handle_message(); 298a295af24SAlistair Popple return IRQ_HANDLED; 29924366360SMahesh Salgaonkar } 30024366360SMahesh Salgaonkar 30124366360SMahesh Salgaonkar static int __init opal_message_init(void) 30224366360SMahesh Salgaonkar { 303a295af24SAlistair Popple int ret, i, irq; 30424366360SMahesh Salgaonkar 30524366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 30624366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 30724366360SMahesh Salgaonkar 308a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 309a295af24SAlistair Popple if (!irq) { 310a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 311a295af24SAlistair Popple __func__, irq); 312a295af24SAlistair Popple return irq; 313a295af24SAlistair Popple } 314a295af24SAlistair Popple 315a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 316a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 31724366360SMahesh Salgaonkar if (ret) { 318a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 31924366360SMahesh Salgaonkar __func__, ret); 32024366360SMahesh Salgaonkar return ret; 32124366360SMahesh Salgaonkar } 322a295af24SAlistair Popple 32324366360SMahesh Salgaonkar return 0; 32424366360SMahesh Salgaonkar } 32524366360SMahesh Salgaonkar 32614a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 32714a43e69SBenjamin Herrenschmidt { 3284f89363bSBenjamin Herrenschmidt s64 rc; 3294f89363bSBenjamin Herrenschmidt __be64 evt, len; 33014a43e69SBenjamin Herrenschmidt 33114a43e69SBenjamin Herrenschmidt if (!opal.entry) 332daea1175SBenjamin Herrenschmidt return -ENODEV; 33314a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3344f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 33514a43e69SBenjamin Herrenschmidt return 0; 3364f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 33714a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 33814a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3394f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 34014a43e69SBenjamin Herrenschmidt return 0; 34114a43e69SBenjamin Herrenschmidt } 34214a43e69SBenjamin Herrenschmidt 34314a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 34414a43e69SBenjamin Herrenschmidt { 34514a43e69SBenjamin Herrenschmidt int written = 0; 3464f89363bSBenjamin Herrenschmidt __be64 olen; 347daea1175SBenjamin Herrenschmidt s64 len, rc; 34814a43e69SBenjamin Herrenschmidt unsigned long flags; 3494f89363bSBenjamin Herrenschmidt __be64 evt; 35014a43e69SBenjamin Herrenschmidt 35114a43e69SBenjamin Herrenschmidt if (!opal.entry) 352daea1175SBenjamin Herrenschmidt return -ENODEV; 35314a43e69SBenjamin Herrenschmidt 35414a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 35514a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 356daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 357daea1175SBenjamin Herrenschmidt * 358daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 359daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 360daea1175SBenjamin Herrenschmidt * enough room and be done with it 36114a43e69SBenjamin Herrenschmidt */ 36214a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3634f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3644f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 36514a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 36614a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 36714a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 36814a43e69SBenjamin Herrenschmidt if (rc) 36914a43e69SBenjamin Herrenschmidt return total_len; 3704f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 37114a43e69SBenjamin Herrenschmidt return -EAGAIN; 37214a43e69SBenjamin Herrenschmidt } 37314a43e69SBenjamin Herrenschmidt 37414a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 37514a43e69SBenjamin Herrenschmidt * should no longer happen. 37614a43e69SBenjamin Herrenschmidt */ 377daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 37814a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 37914a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3804f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3814f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3824f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3831de1455fSBenjamin Herrenschmidt 3841de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3851de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3861de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3871de1455fSBenjamin Herrenschmidt written = total_len; 3881de1455fSBenjamin Herrenschmidt break; 3891de1455fSBenjamin Herrenschmidt } 39014a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 39114a43e69SBenjamin Herrenschmidt total_len -= len; 39214a43e69SBenjamin Herrenschmidt data += len; 39314a43e69SBenjamin Herrenschmidt written += len; 39414a43e69SBenjamin Herrenschmidt } 39514a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 39614a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 39714a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 39814a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 39914a43e69SBenjamin Herrenschmidt */ 40014a43e69SBenjamin Herrenschmidt do 40114a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 4024f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 4034f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 40414a43e69SBenjamin Herrenschmidt } 40514a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 40614a43e69SBenjamin Herrenschmidt return written; 40714a43e69SBenjamin Herrenschmidt } 40814a43e69SBenjamin Herrenschmidt 409b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 410b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 411b63a0ffeSMahesh Salgaonkar { 412b63a0ffeSMahesh Salgaonkar int recovered = 0; 413b63a0ffeSMahesh Salgaonkar 414b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 415b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 416c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 417b63a0ffeSMahesh Salgaonkar recovered = 0; 418b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 419b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 420b63a0ffeSMahesh Salgaonkar recovered = 1; 4211363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 4221363875bSNicholas Piggin /* Fatal machine check */ 4231363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 4241363875bSNicholas Piggin recovered = 0; 4251363875bSNicholas Piggin } else if ((evt->severity == MCE_SEV_ERROR_SYNC) && 4261363875bSNicholas Piggin (user_mode(regs) && !is_global_init(current))) { 427b63a0ffeSMahesh Salgaonkar /* 428b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 429b63a0ffeSMahesh Salgaonkar * in userspace. 430b63a0ffeSMahesh Salgaonkar * 431b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 432b63a0ffeSMahesh Salgaonkar */ 433b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 434b63a0ffeSMahesh Salgaonkar recovered = 1; 435b63a0ffeSMahesh Salgaonkar } 436b63a0ffeSMahesh Salgaonkar return recovered; 437b63a0ffeSMahesh Salgaonkar } 438b63a0ffeSMahesh Salgaonkar 439ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 440ed79ba9eSBenjamin Herrenschmidt { 44136df96f8SMahesh Salgaonkar struct machine_check_event evt; 442e784b649SMahesh Salgaonkar int ret; 443ed79ba9eSBenjamin Herrenschmidt 44436df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 44536df96f8SMahesh Salgaonkar return 0; 446ed79ba9eSBenjamin Herrenschmidt 447ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 44836df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 449ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 450ed79ba9eSBenjamin Herrenschmidt evt.version); 451ed79ba9eSBenjamin Herrenschmidt return 0; 452ed79ba9eSBenjamin Herrenschmidt } 45363f44d65SMichael Ellerman machine_check_print_event_info(&evt, user_mode(regs)); 454ed79ba9eSBenjamin Herrenschmidt 455b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 456b63a0ffeSMahesh Salgaonkar return 1; 457e784b649SMahesh Salgaonkar 458e784b649SMahesh Salgaonkar /* 459e784b649SMahesh Salgaonkar * Unrecovered machine check, we are heading to panic path. 460e784b649SMahesh Salgaonkar * 461e784b649SMahesh Salgaonkar * We may have hit this MCE in very early stage of kernel 462e784b649SMahesh Salgaonkar * initialization even before opal-prd has started running. If 463e784b649SMahesh Salgaonkar * this is the case then this MCE error may go un-noticed or 464e784b649SMahesh Salgaonkar * un-analyzed if we go down panic path. We need to inform 465e784b649SMahesh Salgaonkar * BMC/OCC about this error so that they can collect relevant 466e784b649SMahesh Salgaonkar * data for error analysis before rebooting. 467e784b649SMahesh Salgaonkar * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 468e784b649SMahesh Salgaonkar * This function may not return on BMC based system. 469e784b649SMahesh Salgaonkar */ 470e784b649SMahesh Salgaonkar ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 471e784b649SMahesh Salgaonkar "Unrecoverable Machine Check exception"); 472e784b649SMahesh Salgaonkar if (ret == OPAL_UNSUPPORTED) { 473e784b649SMahesh Salgaonkar pr_emerg("Reboot type %d not supported\n", 474e784b649SMahesh Salgaonkar OPAL_REBOOT_PLATFORM_ERROR); 475e784b649SMahesh Salgaonkar } 476e784b649SMahesh Salgaonkar 477e784b649SMahesh Salgaonkar /* 478e784b649SMahesh Salgaonkar * We reached here. There can be three possibilities: 479e784b649SMahesh Salgaonkar * 1. We are running on a firmware level that do not support 480e784b649SMahesh Salgaonkar * opal_cec_reboot2() 481e784b649SMahesh Salgaonkar * 2. We are running on a firmware level that do not support 482e784b649SMahesh Salgaonkar * OPAL_REBOOT_PLATFORM_ERROR reboot type. 483e784b649SMahesh Salgaonkar * 3. We are running on FSP based system that does not need opal 484e784b649SMahesh Salgaonkar * to trigger checkstop explicitly for error analysis. The FSP 485e784b649SMahesh Salgaonkar * PRD component would have already got notified about this 486e784b649SMahesh Salgaonkar * error through other channels. 487e784b649SMahesh Salgaonkar * 488f2dd80ecSDaniel Axtens * If hardware marked this as an unrecoverable MCE, we are 489f2dd80ecSDaniel Axtens * going to panic anyway. Even if it didn't, it's not safe to 490f2dd80ecSDaniel Axtens * continue at this point, so we should explicitly panic. 491e784b649SMahesh Salgaonkar */ 492f2dd80ecSDaniel Axtens 493f2dd80ecSDaniel Axtens panic("PowerNV Unrecovered Machine Check"); 494b63a0ffeSMahesh Salgaonkar return 0; 495ed79ba9eSBenjamin Herrenschmidt } 496ed79ba9eSBenjamin Herrenschmidt 4970869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 4980869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 4990869b6fdSMahesh Salgaonkar { 5000ef95b41SMahesh Salgaonkar s64 rc; 5010ef95b41SMahesh Salgaonkar 5020ef95b41SMahesh Salgaonkar /* 5030ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 5040ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 5050ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 5060ef95b41SMahesh Salgaonkar */ 5070ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 5080ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 5090ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 5100ef95b41SMahesh Salgaonkar return 1; 5110ef95b41SMahesh Salgaonkar } 5120869b6fdSMahesh Salgaonkar return 0; 5130869b6fdSMahesh Salgaonkar } 5140869b6fdSMahesh Salgaonkar 5150869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5160869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5170869b6fdSMahesh Salgaonkar { 5180ef95b41SMahesh Salgaonkar s64 rc; 5190ef95b41SMahesh Salgaonkar __be64 evt = 0; 5200ef95b41SMahesh Salgaonkar 5210ef95b41SMahesh Salgaonkar /* 5220ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5230ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5240ef95b41SMahesh Salgaonkar * process them. 5250ef95b41SMahesh Salgaonkar */ 5260ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5270869b6fdSMahesh Salgaonkar return 0; 5280ef95b41SMahesh Salgaonkar 5290ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5300ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 53181f2f7ceSAlistair Popple if (rc == OPAL_SUCCESS && evt) 5329f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(evt)); 5330ef95b41SMahesh Salgaonkar 5340ef95b41SMahesh Salgaonkar return 1; 5350869b6fdSMahesh Salgaonkar } 5360869b6fdSMahesh Salgaonkar 53755672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 53855672ecfSMahesh Salgaonkar { 53955672ecfSMahesh Salgaonkar int i; 54055672ecfSMahesh Salgaonkar 54155672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 54255672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 54355672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 54455672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 54555672ecfSMahesh Salgaonkar return 0; 54655672ecfSMahesh Salgaonkar } 54755672ecfSMahesh Salgaonkar 54855672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 54955672ecfSMahesh Salgaonkar { 55055672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 55155672ecfSMahesh Salgaonkar 55255672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 55355672ecfSMahesh Salgaonkar goto out; 55455672ecfSMahesh Salgaonkar 55555672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 556dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 55755672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 55855672ecfSMahesh Salgaonkar 55955672ecfSMahesh Salgaonkar /* 56055672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 56155672ecfSMahesh Salgaonkar */ 56255672ecfSMahesh Salgaonkar if (recover_addr) 56355672ecfSMahesh Salgaonkar regs->nip = recover_addr; 56455672ecfSMahesh Salgaonkar 56555672ecfSMahesh Salgaonkar out: 56655672ecfSMahesh Salgaonkar return !!recover_addr; 56755672ecfSMahesh Salgaonkar } 56855672ecfSMahesh Salgaonkar 5696f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5706f68b5e2SVasant Hegde { 5716f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5726f68b5e2SVasant Hegde if (!opal_kobj) { 5736f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5746f68b5e2SVasant Hegde return -ENOMEM; 5756f68b5e2SVasant Hegde } 5766f68b5e2SVasant Hegde 5776f68b5e2SVasant Hegde return 0; 5786f68b5e2SVasant Hegde } 5796f68b5e2SVasant Hegde 580c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 581c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 582c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 583c8742f85SBenjamin Herrenschmidt { 584c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 585c8742f85SBenjamin Herrenschmidt bin_attr->size); 586c8742f85SBenjamin Herrenschmidt } 587c8742f85SBenjamin Herrenschmidt 588c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 589c8742f85SBenjamin Herrenschmidt 590c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 591c8742f85SBenjamin Herrenschmidt { 592c8742f85SBenjamin Herrenschmidt const __be64 *syms; 593c8742f85SBenjamin Herrenschmidt unsigned int size; 594c8742f85SBenjamin Herrenschmidt struct device_node *fw; 595c8742f85SBenjamin Herrenschmidt int rc; 596c8742f85SBenjamin Herrenschmidt 597c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 598c8742f85SBenjamin Herrenschmidt if (!fw) 599c8742f85SBenjamin Herrenschmidt return; 600c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 601c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 602c8742f85SBenjamin Herrenschmidt return; 603c8742f85SBenjamin Herrenschmidt 604c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 605c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 606c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 607c8742f85SBenjamin Herrenschmidt 608c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 609c8742f85SBenjamin Herrenschmidt if (rc) 610c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 611c8742f85SBenjamin Herrenschmidt } 612c8742f85SBenjamin Herrenschmidt 61311fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 61411fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 61511fe909dSMatt Brown loff_t off, size_t count) 61611fe909dSMatt Brown { 61711fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 61811fe909dSMatt Brown bin_attr->size); 61911fe909dSMatt Brown } 62011fe909dSMatt Brown 62111fe909dSMatt Brown /* 62211fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 62311fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 62411fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 62511fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 62611fe909dSMatt Brown * The new sysfs nodes are only readable by root. 62711fe909dSMatt Brown */ 62811fe909dSMatt Brown static void opal_export_attrs(void) 62911fe909dSMatt Brown { 63011fe909dSMatt Brown struct bin_attribute *attr; 63111fe909dSMatt Brown struct device_node *np; 63211fe909dSMatt Brown struct property *prop; 63311fe909dSMatt Brown struct kobject *kobj; 63411fe909dSMatt Brown u64 vals[2]; 63511fe909dSMatt Brown int rc; 63611fe909dSMatt Brown 63711fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 63811fe909dSMatt Brown if (!np) 63911fe909dSMatt Brown return; 64011fe909dSMatt Brown 64111fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 64211fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 64311fe909dSMatt Brown if (!kobj) { 64411fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 64511fe909dSMatt Brown return; 64611fe909dSMatt Brown } 64711fe909dSMatt Brown 64811fe909dSMatt Brown for_each_property_of_node(np, prop) { 64911fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 65011fe909dSMatt Brown continue; 65111fe909dSMatt Brown 65211fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 65311fe909dSMatt Brown continue; 65411fe909dSMatt Brown 65583c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 65611fe909dSMatt Brown 65711fe909dSMatt Brown if (attr == NULL) { 65811fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 65911fe909dSMatt Brown continue; 66011fe909dSMatt Brown } 66111fe909dSMatt Brown 66283c49190SMichael Ellerman sysfs_bin_attr_init(attr); 66311fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 66411fe909dSMatt Brown attr->attr.mode = 0400; 66511fe909dSMatt Brown attr->read = export_attr_read; 66611fe909dSMatt Brown attr->private = __va(vals[0]); 66711fe909dSMatt Brown attr->size = vals[1]; 66811fe909dSMatt Brown 66911fe909dSMatt Brown if (attr->attr.name == NULL) { 67011fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 67111fe909dSMatt Brown kfree(attr); 67211fe909dSMatt Brown continue; 67311fe909dSMatt Brown } 67411fe909dSMatt Brown 67511fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 67611fe909dSMatt Brown if (rc) { 67711fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 67811fe909dSMatt Brown rc, prop->name); 67911fe909dSMatt Brown kfree(attr->attr.name); 68011fe909dSMatt Brown kfree(attr); 68111fe909dSMatt Brown } 68211fe909dSMatt Brown } 68311fe909dSMatt Brown 68411fe909dSMatt Brown of_node_put(np); 68511fe909dSMatt Brown } 68611fe909dSMatt Brown 687b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 688b09c2ec4SVasant Hegde { 689b09c2ec4SVasant Hegde void *addr; 690b09c2ec4SVasant Hegde uint64_t size; 691b09c2ec4SVasant Hegde int rc; 692b09c2ec4SVasant Hegde 693b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 694b962f5a4SStewart Smith return; 695b962f5a4SStewart Smith 696b09c2ec4SVasant Hegde /* Register kernel log buffer */ 697b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 6986501ab5eSPranith Kumar if (addr == NULL) 6996501ab5eSPranith Kumar return; 7006501ab5eSPranith Kumar 701b09c2ec4SVasant Hegde size = log_buf_len_get(); 7026501ab5eSPranith Kumar if (size == 0) 7036501ab5eSPranith Kumar return; 7046501ab5eSPranith Kumar 705b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 706b09c2ec4SVasant Hegde __pa(addr), size); 707b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 708b09c2ec4SVasant Hegde * know about that call 709b09c2ec4SVasant Hegde */ 710b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 711b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 712b09c2ec4SVasant Hegde "rc = %d\n", rc); 713b09c2ec4SVasant Hegde } 714608b286dSJeremy Kerr 7159e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 716ed59190eSCyril Bur { 717ed59190eSCyril Bur struct device_node *np; 718ed59190eSCyril Bur 7199e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 72047083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 72147083450SNeelesh Gupta } 72247083450SNeelesh Gupta 7233bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 7243bf57561SBenjamin Herrenschmidt { 725a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 7269f0fd049SAlistair Popple __be64 events; 7279f0fd049SAlistair Popple 7283bf57561SBenjamin Herrenschmidt set_freezable(); 7293bf57561SBenjamin Herrenschmidt do { 7303bf57561SBenjamin Herrenschmidt try_to_freeze(); 7319f0fd049SAlistair Popple opal_poll_events(&events); 7329f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(events)); 733a203658bSBenjamin Herrenschmidt schedule_timeout_interruptible(timeout); 7343bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 7353bf57561SBenjamin Herrenschmidt 7363bf57561SBenjamin Herrenschmidt return 0; 7373bf57561SBenjamin Herrenschmidt } 7383bf57561SBenjamin Herrenschmidt 739a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 740a203658bSBenjamin Herrenschmidt { 741a203658bSBenjamin Herrenschmidt if (kopald_tsk) 742a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 743a203658bSBenjamin Herrenschmidt } 744a203658bSBenjamin Herrenschmidt 7453bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 7463bf57561SBenjamin Herrenschmidt { 7473bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 7483bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 7493bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 7503bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 7513bf57561SBenjamin Herrenschmidt 7523bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 753a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 7543bf57561SBenjamin Herrenschmidt } 7553bf57561SBenjamin Herrenschmidt 75614a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 75714a43e69SBenjamin Herrenschmidt { 758c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 759c1c3a526SGavin Shan int rc; 76014a43e69SBenjamin Herrenschmidt 76114a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 76214a43e69SBenjamin Herrenschmidt if (!opal_node) { 76308135139SMichael Ellerman pr_warn("Device node not found\n"); 76414a43e69SBenjamin Herrenschmidt return -ENODEV; 76514a43e69SBenjamin Herrenschmidt } 7662db29d28SBenjamin Herrenschmidt 7672db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 76814a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 7692db29d28SBenjamin Herrenschmidt if (consoles) { 77014a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 77114a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 77214a43e69SBenjamin Herrenschmidt continue; 77314a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 77414a43e69SBenjamin Herrenschmidt } 77514a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7762db29d28SBenjamin Herrenschmidt } 777a125e092SBenjamin Herrenschmidt 77896e023e7SAlistair Popple /* Initialise OPAL messaging system */ 77996e023e7SAlistair Popple opal_message_init(); 78096e023e7SAlistair Popple 78196e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 78296e023e7SAlistair Popple opal_async_comp_init(); 78396e023e7SAlistair Popple 78496e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 78596e023e7SAlistair Popple opal_sensor_init(); 78696e023e7SAlistair Popple 78796e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 78896e023e7SAlistair Popple opal_hmi_handler_init(); 78996e023e7SAlistair Popple 79047083450SNeelesh Gupta /* Create i2c platform devices */ 7919e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 79247083450SNeelesh Gupta 7933bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 7943bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 7953bf57561SBenjamin Herrenschmidt 796c159b596SVasant Hegde /* Create leds platform devices */ 797c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 798c159b596SVasant Hegde if (leds) { 799c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 800c159b596SVasant Hegde of_node_put(leds); 801c159b596SVasant Hegde } 802c159b596SVasant Hegde 8039b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 8049b4fffa1SAndrew Donnellan opal_msglog_init(); 8059b4fffa1SAndrew Donnellan 8066f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 8076f68b5e2SVasant Hegde rc = opal_sysfs_init(); 80850bd6153SVasant Hegde if (rc == 0) { 809c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 810c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 811b09c2ec4SVasant Hegde /* Setup dump region interface */ 812b09c2ec4SVasant Hegde opal_dump_region_init(); 813774fea1aSStewart Smith /* Setup error log interface */ 814774fea1aSStewart Smith rc = opal_elog_init(); 81550bd6153SVasant Hegde /* Setup code update interface */ 816ed59190eSCyril Bur opal_flash_update_init(); 817c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 818c7e64b9cSStewart Smith opal_platform_dump_init(); 8194029cd66SNeelesh Gupta /* Setup system parameters interface */ 8204029cd66SNeelesh Gupta opal_sys_param_init(); 8219b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 8229b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 82350bd6153SVasant Hegde } 8246f68b5e2SVasant Hegde 82511fe909dSMatt Brown /* Export all properties */ 82611fe909dSMatt Brown opal_export_attrs(); 82711fe909dSMatt Brown 8280d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 8299e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 8309e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 8319e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 832ed59190eSCyril Bur 83343a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 8349e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 83543a1dd9bSSuraj Jitindar Singh 836affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 837affddff6SRussell Currey opal_kmsg_init(); 838affddff6SRussell Currey 83914a43e69SBenjamin Herrenschmidt return 0; 84014a43e69SBenjamin Herrenschmidt } 841b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 84273ed148aSBenjamin Herrenschmidt 84373ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 84473ed148aSBenjamin Herrenschmidt { 845f7d98d18SVasant Hegde long rc = OPAL_BUSY; 84673ed148aSBenjamin Herrenschmidt 8479f0fd049SAlistair Popple opal_event_shutdown(); 848f7d98d18SVasant Hegde 849f7d98d18SVasant Hegde /* 850f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 851f7d98d18SVasant Hegde * potentially write to our memory has completed such 852f7d98d18SVasant Hegde * as an ongoing dump retrieval 853f7d98d18SVasant Hegde */ 854f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 855f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 856f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 857f7d98d18SVasant Hegde opal_poll_events(NULL); 858f7d98d18SVasant Hegde else 859f7d98d18SVasant Hegde mdelay(10); 860f7d98d18SVasant Hegde } 861b09c2ec4SVasant Hegde 862b09c2ec4SVasant Hegde /* Unregister memory dump region */ 863b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 864b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 86573ed148aSBenjamin Herrenschmidt } 866e28b05e7SJoel Stanley 867e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 868e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 869594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 870594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 871608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 872608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 873ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 874ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 875ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 8760d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 8773441f04bSAnton Blanchard 8783441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 8793441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 8803441f04bSAnton Blanchard unsigned long vmalloc_size) 8813441f04bSAnton Blanchard { 8823441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 8833441f04bSAnton Blanchard unsigned long i = 0; 8843441f04bSAnton Blanchard 8853441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 8863441f04bSAnton Blanchard if (!sg) 8873441f04bSAnton Blanchard goto nomem; 8883441f04bSAnton Blanchard 8893441f04bSAnton Blanchard first = sg; 8903441f04bSAnton Blanchard 8913441f04bSAnton Blanchard while (vmalloc_size > 0) { 8923441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 8933441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 8943441f04bSAnton Blanchard 8953441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 8963441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 8973441f04bSAnton Blanchard i++; 8983441f04bSAnton Blanchard 8993441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 9003441f04bSAnton Blanchard struct opal_sg_list *next; 9013441f04bSAnton Blanchard 9023441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 9033441f04bSAnton Blanchard if (!next) 9043441f04bSAnton Blanchard goto nomem; 9053441f04bSAnton Blanchard 9063441f04bSAnton Blanchard sg->length = cpu_to_be64( 9073441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 9083441f04bSAnton Blanchard i = 0; 9093441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 9103441f04bSAnton Blanchard sg = next; 9113441f04bSAnton Blanchard } 9123441f04bSAnton Blanchard 9133441f04bSAnton Blanchard vmalloc_addr += length; 9143441f04bSAnton Blanchard vmalloc_size -= length; 9153441f04bSAnton Blanchard } 9163441f04bSAnton Blanchard 9173441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 9183441f04bSAnton Blanchard 9193441f04bSAnton Blanchard return first; 9203441f04bSAnton Blanchard 9213441f04bSAnton Blanchard nomem: 9223441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 9233441f04bSAnton Blanchard opal_free_sg_list(first); 9243441f04bSAnton Blanchard return NULL; 9253441f04bSAnton Blanchard } 9263441f04bSAnton Blanchard 9273441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 9283441f04bSAnton Blanchard { 9293441f04bSAnton Blanchard while (sg) { 9303441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 9313441f04bSAnton Blanchard 9323441f04bSAnton Blanchard kfree(sg); 9333441f04bSAnton Blanchard 9343441f04bSAnton Blanchard if (next) 9353441f04bSAnton Blanchard sg = __va(next); 9363441f04bSAnton Blanchard else 9373441f04bSAnton Blanchard sg = NULL; 9383441f04bSAnton Blanchard } 9393441f04bSAnton Blanchard } 94016b1d26eSNeelesh Gupta 941e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 942e3c5c2e0SCédric Le Goater { 943e3c5c2e0SCédric Le Goater switch (rc) { 944e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 945e3c5c2e0SCédric Le Goater 946e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 947e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 948e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 949e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 95014aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 951e3c5c2e0SCédric Le Goater 952e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 953e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 954e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 955e3c5c2e0SCédric Le Goater default: 956e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 957e3c5c2e0SCédric Le Goater return -EIO; 958e3c5c2e0SCédric Le Goater } 959e3c5c2e0SCédric Le Goater } 960e3c5c2e0SCédric Le Goater 9611d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 9621d0761d2SAlistair Popple { 9631d0761d2SAlistair Popple int rc; 9641d0761d2SAlistair Popple 9651d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 9661d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 9671d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 9681d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 9691d0761d2SAlistair Popple } 9701d0761d2SAlistair Popple } 9711d0761d2SAlistair Popple 97216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 97316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 97416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 97516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 97616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 97747083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 978c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 979c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 980c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 98143a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 98243a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 983ffe6d810SPaul Mackerras /* Export this for KVM */ 984ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 9855af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 986