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 { 624926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 634926616cSBenjamin Herrenschmidt * 644926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 654926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 664926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 674926616cSBenjamin Herrenschmidt */ 684926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 694926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE); 704926616cSBenjamin Herrenschmidt #else 714926616cSBenjamin Herrenschmidt opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE); 724926616cSBenjamin Herrenschmidt #endif 73d3cbff1bSBenjamin Herrenschmidt 74d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 75d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 76d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 774926616cSBenjamin Herrenschmidt } 784926616cSBenjamin Herrenschmidt 7914a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 8014a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 8114a43e69SBenjamin Herrenschmidt { 8255672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 839d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 8414a43e69SBenjamin Herrenschmidt 8514a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 8614a43e69SBenjamin Herrenschmidt return 0; 8714a43e69SBenjamin Herrenschmidt 8814a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 8914a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 9055672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 9114a43e69SBenjamin Herrenschmidt 9255672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 9314a43e69SBenjamin Herrenschmidt return 1; 9414a43e69SBenjamin Herrenschmidt 9514a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 9614a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 9755672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 9814a43e69SBenjamin Herrenschmidt 999d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 10014a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1019d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 10214a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1039d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 10455672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 10514a43e69SBenjamin Herrenschmidt 10675b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 107e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 108e4d54f71SStewart Smith pr_info("OPAL detected !\n"); 10914a43e69SBenjamin Herrenschmidt } else { 110786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 11114a43e69SBenjamin Herrenschmidt } 11214a43e69SBenjamin Herrenschmidt 113c4463b37SJeremy Kerr return 1; 114c4463b37SJeremy Kerr } 115c4463b37SJeremy Kerr 11655672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 11755672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 11855672ecfSMahesh Salgaonkar { 1199d0c4dfeSRob Herring int i, psize, size; 12055672ecfSMahesh Salgaonkar const __be32 *prop; 12155672ecfSMahesh Salgaonkar 12255672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 12355672ecfSMahesh Salgaonkar return 0; 12455672ecfSMahesh Salgaonkar 1256e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 12655672ecfSMahesh Salgaonkar 12755672ecfSMahesh Salgaonkar if (!prop) 12855672ecfSMahesh Salgaonkar return 1; 12955672ecfSMahesh Salgaonkar 13055672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 13155672ecfSMahesh Salgaonkar 13255672ecfSMahesh Salgaonkar /* 1336e556b47SMahesh Salgaonkar * Calculate number of available entries. 1346e556b47SMahesh Salgaonkar * 1356e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1366e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1376e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1386e556b47SMahesh Salgaonkar */ 1396e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1406e556b47SMahesh Salgaonkar 1416e556b47SMahesh Salgaonkar /* Sanity check */ 1426e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1436e556b47SMahesh Salgaonkar return 1; 1446e556b47SMahesh Salgaonkar 1456e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1466e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1476e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1486e556b47SMahesh Salgaonkar 1496e556b47SMahesh Salgaonkar /* 15055672ecfSMahesh Salgaonkar * Allocate a buffer to hold the MC recoverable ranges. We would be 15155672ecfSMahesh Salgaonkar * accessing them in real mode, hence it needs to be within 15255672ecfSMahesh Salgaonkar * RMO region. 15355672ecfSMahesh Salgaonkar */ 15455672ecfSMahesh Salgaonkar mc_recoverable_range =__va(memblock_alloc_base(size, __alignof__(u64), 15555672ecfSMahesh Salgaonkar ppc64_rma_size)); 15655672ecfSMahesh Salgaonkar memset(mc_recoverable_range, 0, size); 15755672ecfSMahesh Salgaonkar 1586e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 15955672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 16055672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 16155672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 16255672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 16355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 16455672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 16555672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 16655672ecfSMahesh Salgaonkar 16755672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 16855672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 16955672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 17055672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 17155672ecfSMahesh Salgaonkar } 17255672ecfSMahesh Salgaonkar return 1; 17355672ecfSMahesh Salgaonkar } 17455672ecfSMahesh Salgaonkar 175c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 176c4463b37SJeremy Kerr { 17729186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 178c4463b37SJeremy Kerr u64 glue; 179c4463b37SJeremy Kerr 180c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 181c4463b37SJeremy Kerr return -ENODEV; 182c4463b37SJeremy Kerr 18328446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 18428446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 185ed79ba9eSBenjamin Herrenschmidt */ 186ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 1876507955cSMahesh Salgaonkar 1886507955cSMahesh Salgaonkar /* 1896507955cSMahesh Salgaonkar * Check if we are running on newer firmware that exports 1906507955cSMahesh Salgaonkar * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch 1916507955cSMahesh Salgaonkar * the HMI interrupt and we catch it directly in Linux. 1926507955cSMahesh Salgaonkar * 1936507955cSMahesh Salgaonkar * For older firmware (i.e currently released POWER8 System Firmware 1946507955cSMahesh Salgaonkar * as of today <= SV810_087), we fallback to old behavior and let OPAL 1956507955cSMahesh Salgaonkar * patch the HMI vector and handle it inside OPAL firmware. 1966507955cSMahesh Salgaonkar * 1976507955cSMahesh Salgaonkar * For newer firmware (in development/yet to be released) we will 1986507955cSMahesh Salgaonkar * start catching/handling HMI directly in Linux. 1996507955cSMahesh Salgaonkar */ 2006507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 20108135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2026507955cSMahesh Salgaonkar opal_register_exception_handler( 2036507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2046507955cSMahesh Salgaonkar 0, glue); 2056507955cSMahesh Salgaonkar glue += 128; 2066507955cSMahesh Salgaonkar } 2076507955cSMahesh Salgaonkar 208ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 20929186097SBenjamin Herrenschmidt #endif 210ed79ba9eSBenjamin Herrenschmidt 211c4463b37SJeremy Kerr return 0; 21214a43e69SBenjamin Herrenschmidt } 213b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 214c4463b37SJeremy Kerr 21524366360SMahesh Salgaonkar /* 21624366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 21724366360SMahesh Salgaonkar * notified for specific messgae type. 21824366360SMahesh Salgaonkar */ 219d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 22024366360SMahesh Salgaonkar struct notifier_block *nb) 22124366360SMahesh Salgaonkar { 222792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 223792f96e9SNeelesh Gupta pr_warning("%s: Invalid arguments, msg_type:%d\n", 22424366360SMahesh Salgaonkar __func__, msg_type); 22524366360SMahesh Salgaonkar return -EINVAL; 22624366360SMahesh Salgaonkar } 227792f96e9SNeelesh Gupta 22824366360SMahesh Salgaonkar return atomic_notifier_chain_register( 22924366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 23024366360SMahesh Salgaonkar } 231594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 23224366360SMahesh Salgaonkar 233df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 234b921e902SNeelesh Gupta struct notifier_block *nb) 235b921e902SNeelesh Gupta { 236b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 237b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 238b921e902SNeelesh Gupta } 239594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 240b921e902SNeelesh Gupta 24124366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 24224366360SMahesh Salgaonkar { 24324366360SMahesh Salgaonkar /* notify subscribers */ 24424366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 24524366360SMahesh Salgaonkar msg_type, msg); 24624366360SMahesh Salgaonkar } 24724366360SMahesh Salgaonkar 24824366360SMahesh Salgaonkar static void opal_handle_message(void) 24924366360SMahesh Salgaonkar { 25024366360SMahesh Salgaonkar s64 ret; 25124366360SMahesh Salgaonkar /* 25224366360SMahesh Salgaonkar * TODO: pre-allocate a message buffer depending on opal-msg-size 25324366360SMahesh Salgaonkar * value in /proc/device-tree. 25424366360SMahesh Salgaonkar */ 25524366360SMahesh Salgaonkar static struct opal_msg msg; 256bb4398e1SAnton Blanchard u32 type; 25724366360SMahesh Salgaonkar 25824366360SMahesh Salgaonkar ret = opal_get_msg(__pa(&msg), sizeof(msg)); 25924366360SMahesh Salgaonkar /* No opal message pending. */ 26024366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 26124366360SMahesh Salgaonkar return; 26224366360SMahesh Salgaonkar 26324366360SMahesh Salgaonkar /* check for errors. */ 26424366360SMahesh Salgaonkar if (ret) { 2651a84db56SMasanari Iida pr_warning("%s: Failed to retrieve opal message, err=%lld\n", 26624366360SMahesh Salgaonkar __func__, ret); 26724366360SMahesh Salgaonkar return; 26824366360SMahesh Salgaonkar } 26924366360SMahesh Salgaonkar 270bb4398e1SAnton Blanchard type = be32_to_cpu(msg.msg_type); 271bb4398e1SAnton Blanchard 27224366360SMahesh Salgaonkar /* Sanity check */ 273792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 27498da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 27524366360SMahesh Salgaonkar return; 27624366360SMahesh Salgaonkar } 277bb4398e1SAnton Blanchard opal_message_do_notify(type, (void *)&msg); 27824366360SMahesh Salgaonkar } 27924366360SMahesh Salgaonkar 280a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 28124366360SMahesh Salgaonkar { 28224366360SMahesh Salgaonkar opal_handle_message(); 283a295af24SAlistair Popple return IRQ_HANDLED; 28424366360SMahesh Salgaonkar } 28524366360SMahesh Salgaonkar 28624366360SMahesh Salgaonkar static int __init opal_message_init(void) 28724366360SMahesh Salgaonkar { 288a295af24SAlistair Popple int ret, i, irq; 28924366360SMahesh Salgaonkar 29024366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 29124366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 29224366360SMahesh Salgaonkar 293a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 294a295af24SAlistair Popple if (!irq) { 295a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 296a295af24SAlistair Popple __func__, irq); 297a295af24SAlistair Popple return irq; 298a295af24SAlistair Popple } 299a295af24SAlistair Popple 300a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 301a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 30224366360SMahesh Salgaonkar if (ret) { 303a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 30424366360SMahesh Salgaonkar __func__, ret); 30524366360SMahesh Salgaonkar return ret; 30624366360SMahesh Salgaonkar } 307a295af24SAlistair Popple 30824366360SMahesh Salgaonkar return 0; 30924366360SMahesh Salgaonkar } 31024366360SMahesh Salgaonkar 31114a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 31214a43e69SBenjamin Herrenschmidt { 3134f89363bSBenjamin Herrenschmidt s64 rc; 3144f89363bSBenjamin Herrenschmidt __be64 evt, len; 31514a43e69SBenjamin Herrenschmidt 31614a43e69SBenjamin Herrenschmidt if (!opal.entry) 317daea1175SBenjamin Herrenschmidt return -ENODEV; 31814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3194f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 32014a43e69SBenjamin Herrenschmidt return 0; 3214f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 32214a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 32314a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3244f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 32514a43e69SBenjamin Herrenschmidt return 0; 32614a43e69SBenjamin Herrenschmidt } 32714a43e69SBenjamin Herrenschmidt 32814a43e69SBenjamin Herrenschmidt int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 32914a43e69SBenjamin Herrenschmidt { 33014a43e69SBenjamin Herrenschmidt int written = 0; 3314f89363bSBenjamin Herrenschmidt __be64 olen; 332daea1175SBenjamin Herrenschmidt s64 len, rc; 33314a43e69SBenjamin Herrenschmidt unsigned long flags; 3344f89363bSBenjamin Herrenschmidt __be64 evt; 33514a43e69SBenjamin Herrenschmidt 33614a43e69SBenjamin Herrenschmidt if (!opal.entry) 337daea1175SBenjamin Herrenschmidt return -ENODEV; 33814a43e69SBenjamin Herrenschmidt 33914a43e69SBenjamin Herrenschmidt /* We want put_chars to be atomic to avoid mangling of hvsi 34014a43e69SBenjamin Herrenschmidt * packets. To do that, we first test for room and return 341daea1175SBenjamin Herrenschmidt * -EAGAIN if there isn't enough. 342daea1175SBenjamin Herrenschmidt * 343daea1175SBenjamin Herrenschmidt * Unfortunately, opal_console_write_buffer_space() doesn't 344daea1175SBenjamin Herrenschmidt * appear to work on opal v1, so we just assume there is 345daea1175SBenjamin Herrenschmidt * enough room and be done with it 34614a43e69SBenjamin Herrenschmidt */ 34714a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3484f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 3494f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 35014a43e69SBenjamin Herrenschmidt if (rc || len < total_len) { 35114a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 35214a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 35314a43e69SBenjamin Herrenschmidt if (rc) 35414a43e69SBenjamin Herrenschmidt return total_len; 3554f89363bSBenjamin Herrenschmidt opal_poll_events(NULL); 35614a43e69SBenjamin Herrenschmidt return -EAGAIN; 35714a43e69SBenjamin Herrenschmidt } 35814a43e69SBenjamin Herrenschmidt 35914a43e69SBenjamin Herrenschmidt /* We still try to handle partial completions, though they 36014a43e69SBenjamin Herrenschmidt * should no longer happen. 36114a43e69SBenjamin Herrenschmidt */ 362daea1175SBenjamin Herrenschmidt rc = OPAL_BUSY; 36314a43e69SBenjamin Herrenschmidt while(total_len > 0 && (rc == OPAL_BUSY || 36414a43e69SBenjamin Herrenschmidt rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { 3654f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3664f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 3674f89363bSBenjamin Herrenschmidt len = be64_to_cpu(olen); 3681de1455fSBenjamin Herrenschmidt 3691de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 3701de1455fSBenjamin Herrenschmidt if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && 3711de1455fSBenjamin Herrenschmidt rc != OPAL_BUSY_EVENT) { 3721de1455fSBenjamin Herrenschmidt written = total_len; 3731de1455fSBenjamin Herrenschmidt break; 3741de1455fSBenjamin Herrenschmidt } 37514a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) { 37614a43e69SBenjamin Herrenschmidt total_len -= len; 37714a43e69SBenjamin Herrenschmidt data += len; 37814a43e69SBenjamin Herrenschmidt written += len; 37914a43e69SBenjamin Herrenschmidt } 38014a43e69SBenjamin Herrenschmidt /* This is a bit nasty but we need that for the console to 38114a43e69SBenjamin Herrenschmidt * flush when there aren't any interrupts. We will clean 38214a43e69SBenjamin Herrenschmidt * things a bit later to limit that to synchronous path 38314a43e69SBenjamin Herrenschmidt * such as the kernel console and xmon/udbg 38414a43e69SBenjamin Herrenschmidt */ 38514a43e69SBenjamin Herrenschmidt do 38614a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3874f89363bSBenjamin Herrenschmidt while(rc == OPAL_SUCCESS && 3884f89363bSBenjamin Herrenschmidt (be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)); 38914a43e69SBenjamin Herrenschmidt } 39014a43e69SBenjamin Herrenschmidt spin_unlock_irqrestore(&opal_write_lock, flags); 39114a43e69SBenjamin Herrenschmidt return written; 39214a43e69SBenjamin Herrenschmidt } 39314a43e69SBenjamin Herrenschmidt 394b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 395b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 396b63a0ffeSMahesh Salgaonkar { 397b63a0ffeSMahesh Salgaonkar int recovered = 0; 398b63a0ffeSMahesh Salgaonkar 399b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 400b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 401c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 402b63a0ffeSMahesh Salgaonkar recovered = 0; 403b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 404b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 405b63a0ffeSMahesh Salgaonkar recovered = 1; 4061363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 4071363875bSNicholas Piggin /* Fatal machine check */ 4081363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 4091363875bSNicholas Piggin recovered = 0; 4101363875bSNicholas Piggin } else if ((evt->severity == MCE_SEV_ERROR_SYNC) && 4111363875bSNicholas Piggin (user_mode(regs) && !is_global_init(current))) { 412b63a0ffeSMahesh Salgaonkar /* 413b63a0ffeSMahesh Salgaonkar * For now, kill the task if we have received exception when 414b63a0ffeSMahesh Salgaonkar * in userspace. 415b63a0ffeSMahesh Salgaonkar * 416b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 417b63a0ffeSMahesh Salgaonkar */ 418b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 419b63a0ffeSMahesh Salgaonkar recovered = 1; 420b63a0ffeSMahesh Salgaonkar } 421b63a0ffeSMahesh Salgaonkar return recovered; 422b63a0ffeSMahesh Salgaonkar } 423b63a0ffeSMahesh Salgaonkar 424ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 425ed79ba9eSBenjamin Herrenschmidt { 42636df96f8SMahesh Salgaonkar struct machine_check_event evt; 427e784b649SMahesh Salgaonkar int ret; 428ed79ba9eSBenjamin Herrenschmidt 42936df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 43036df96f8SMahesh Salgaonkar return 0; 431ed79ba9eSBenjamin Herrenschmidt 432ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 43336df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 434ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 435ed79ba9eSBenjamin Herrenschmidt evt.version); 436ed79ba9eSBenjamin Herrenschmidt return 0; 437ed79ba9eSBenjamin Herrenschmidt } 43863f44d65SMichael Ellerman machine_check_print_event_info(&evt, user_mode(regs)); 439ed79ba9eSBenjamin Herrenschmidt 440b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 441b63a0ffeSMahesh Salgaonkar return 1; 442e784b649SMahesh Salgaonkar 443e784b649SMahesh Salgaonkar /* 444e784b649SMahesh Salgaonkar * Unrecovered machine check, we are heading to panic path. 445e784b649SMahesh Salgaonkar * 446e784b649SMahesh Salgaonkar * We may have hit this MCE in very early stage of kernel 447e784b649SMahesh Salgaonkar * initialization even before opal-prd has started running. If 448e784b649SMahesh Salgaonkar * this is the case then this MCE error may go un-noticed or 449e784b649SMahesh Salgaonkar * un-analyzed if we go down panic path. We need to inform 450e784b649SMahesh Salgaonkar * BMC/OCC about this error so that they can collect relevant 451e784b649SMahesh Salgaonkar * data for error analysis before rebooting. 452e784b649SMahesh Salgaonkar * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. 453e784b649SMahesh Salgaonkar * This function may not return on BMC based system. 454e784b649SMahesh Salgaonkar */ 455e784b649SMahesh Salgaonkar ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, 456e784b649SMahesh Salgaonkar "Unrecoverable Machine Check exception"); 457e784b649SMahesh Salgaonkar if (ret == OPAL_UNSUPPORTED) { 458e784b649SMahesh Salgaonkar pr_emerg("Reboot type %d not supported\n", 459e784b649SMahesh Salgaonkar OPAL_REBOOT_PLATFORM_ERROR); 460e784b649SMahesh Salgaonkar } 461e784b649SMahesh Salgaonkar 462e784b649SMahesh Salgaonkar /* 463e784b649SMahesh Salgaonkar * We reached here. There can be three possibilities: 464e784b649SMahesh Salgaonkar * 1. We are running on a firmware level that do not support 465e784b649SMahesh Salgaonkar * opal_cec_reboot2() 466e784b649SMahesh Salgaonkar * 2. We are running on a firmware level that do not support 467e784b649SMahesh Salgaonkar * OPAL_REBOOT_PLATFORM_ERROR reboot type. 468e784b649SMahesh Salgaonkar * 3. We are running on FSP based system that does not need opal 469e784b649SMahesh Salgaonkar * to trigger checkstop explicitly for error analysis. The FSP 470e784b649SMahesh Salgaonkar * PRD component would have already got notified about this 471e784b649SMahesh Salgaonkar * error through other channels. 472e784b649SMahesh Salgaonkar * 473f2dd80ecSDaniel Axtens * If hardware marked this as an unrecoverable MCE, we are 474f2dd80ecSDaniel Axtens * going to panic anyway. Even if it didn't, it's not safe to 475f2dd80ecSDaniel Axtens * continue at this point, so we should explicitly panic. 476e784b649SMahesh Salgaonkar */ 477f2dd80ecSDaniel Axtens 478f2dd80ecSDaniel Axtens panic("PowerNV Unrecovered Machine Check"); 479b63a0ffeSMahesh Salgaonkar return 0; 480ed79ba9eSBenjamin Herrenschmidt } 481ed79ba9eSBenjamin Herrenschmidt 4820869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 4830869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 4840869b6fdSMahesh Salgaonkar { 4850ef95b41SMahesh Salgaonkar s64 rc; 4860ef95b41SMahesh Salgaonkar 4870ef95b41SMahesh Salgaonkar /* 4880ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 4890ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 4900ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 4910ef95b41SMahesh Salgaonkar */ 4920ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 4930ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 4940ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 4950ef95b41SMahesh Salgaonkar return 1; 4960ef95b41SMahesh Salgaonkar } 4970869b6fdSMahesh Salgaonkar return 0; 4980869b6fdSMahesh Salgaonkar } 4990869b6fdSMahesh Salgaonkar 5000869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 5010869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 5020869b6fdSMahesh Salgaonkar { 5030ef95b41SMahesh Salgaonkar s64 rc; 5040ef95b41SMahesh Salgaonkar __be64 evt = 0; 5050ef95b41SMahesh Salgaonkar 5060ef95b41SMahesh Salgaonkar /* 5070ef95b41SMahesh Salgaonkar * Check if HMI event is available. 5080ef95b41SMahesh Salgaonkar * if Yes, then call opal_poll_events to pull opal messages and 5090ef95b41SMahesh Salgaonkar * process them. 5100ef95b41SMahesh Salgaonkar */ 5110ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 5120869b6fdSMahesh Salgaonkar return 0; 5130ef95b41SMahesh Salgaonkar 5140ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 5150ef95b41SMahesh Salgaonkar rc = opal_poll_events(&evt); 51681f2f7ceSAlistair Popple if (rc == OPAL_SUCCESS && evt) 5179f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(evt)); 5180ef95b41SMahesh Salgaonkar 5190ef95b41SMahesh Salgaonkar return 1; 5200869b6fdSMahesh Salgaonkar } 5210869b6fdSMahesh Salgaonkar 52255672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 52355672ecfSMahesh Salgaonkar { 52455672ecfSMahesh Salgaonkar int i; 52555672ecfSMahesh Salgaonkar 52655672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 52755672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 52855672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 52955672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 53055672ecfSMahesh Salgaonkar return 0; 53155672ecfSMahesh Salgaonkar } 53255672ecfSMahesh Salgaonkar 53355672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 53455672ecfSMahesh Salgaonkar { 53555672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 53655672ecfSMahesh Salgaonkar 53755672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 53855672ecfSMahesh Salgaonkar goto out; 53955672ecfSMahesh Salgaonkar 54055672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 541dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 54255672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 54355672ecfSMahesh Salgaonkar 54455672ecfSMahesh Salgaonkar /* 54555672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 54655672ecfSMahesh Salgaonkar */ 54755672ecfSMahesh Salgaonkar if (recover_addr) 54855672ecfSMahesh Salgaonkar regs->nip = recover_addr; 54955672ecfSMahesh Salgaonkar 55055672ecfSMahesh Salgaonkar out: 55155672ecfSMahesh Salgaonkar return !!recover_addr; 55255672ecfSMahesh Salgaonkar } 55355672ecfSMahesh Salgaonkar 5546f68b5e2SVasant Hegde static int opal_sysfs_init(void) 5556f68b5e2SVasant Hegde { 5566f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 5576f68b5e2SVasant Hegde if (!opal_kobj) { 5586f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 5596f68b5e2SVasant Hegde return -ENOMEM; 5606f68b5e2SVasant Hegde } 5616f68b5e2SVasant Hegde 5626f68b5e2SVasant Hegde return 0; 5636f68b5e2SVasant Hegde } 5646f68b5e2SVasant Hegde 565c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 566c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 567c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 568c8742f85SBenjamin Herrenschmidt { 569c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 570c8742f85SBenjamin Herrenschmidt bin_attr->size); 571c8742f85SBenjamin Herrenschmidt } 572c8742f85SBenjamin Herrenschmidt 573c8742f85SBenjamin Herrenschmidt static BIN_ATTR_RO(symbol_map, 0); 574c8742f85SBenjamin Herrenschmidt 575c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 576c8742f85SBenjamin Herrenschmidt { 577c8742f85SBenjamin Herrenschmidt const __be64 *syms; 578c8742f85SBenjamin Herrenschmidt unsigned int size; 579c8742f85SBenjamin Herrenschmidt struct device_node *fw; 580c8742f85SBenjamin Herrenschmidt int rc; 581c8742f85SBenjamin Herrenschmidt 582c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 583c8742f85SBenjamin Herrenschmidt if (!fw) 584c8742f85SBenjamin Herrenschmidt return; 585c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 586c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 587c8742f85SBenjamin Herrenschmidt return; 588c8742f85SBenjamin Herrenschmidt 589c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 590c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0])); 591c8742f85SBenjamin Herrenschmidt bin_attr_symbol_map.size = be64_to_cpu(syms[1]); 592c8742f85SBenjamin Herrenschmidt 593c8742f85SBenjamin Herrenschmidt rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); 594c8742f85SBenjamin Herrenschmidt if (rc) 595c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 596c8742f85SBenjamin Herrenschmidt } 597c8742f85SBenjamin Herrenschmidt 59811fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 59911fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 60011fe909dSMatt Brown loff_t off, size_t count) 60111fe909dSMatt Brown { 60211fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 60311fe909dSMatt Brown bin_attr->size); 60411fe909dSMatt Brown } 60511fe909dSMatt Brown 60611fe909dSMatt Brown /* 60711fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 60811fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 60911fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 61011fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 61111fe909dSMatt Brown * The new sysfs nodes are only readable by root. 61211fe909dSMatt Brown */ 61311fe909dSMatt Brown static void opal_export_attrs(void) 61411fe909dSMatt Brown { 61511fe909dSMatt Brown struct bin_attribute *attr; 61611fe909dSMatt Brown struct device_node *np; 61711fe909dSMatt Brown struct property *prop; 61811fe909dSMatt Brown struct kobject *kobj; 61911fe909dSMatt Brown u64 vals[2]; 62011fe909dSMatt Brown int rc; 62111fe909dSMatt Brown 62211fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 62311fe909dSMatt Brown if (!np) 62411fe909dSMatt Brown return; 62511fe909dSMatt Brown 62611fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 62711fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 62811fe909dSMatt Brown if (!kobj) { 62911fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 63011fe909dSMatt Brown return; 63111fe909dSMatt Brown } 63211fe909dSMatt Brown 63311fe909dSMatt Brown for_each_property_of_node(np, prop) { 63411fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 63511fe909dSMatt Brown continue; 63611fe909dSMatt Brown 63711fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 63811fe909dSMatt Brown continue; 63911fe909dSMatt Brown 64011fe909dSMatt Brown attr = kmalloc(sizeof(*attr), GFP_KERNEL); 64111fe909dSMatt Brown 64211fe909dSMatt Brown if (attr == NULL) { 64311fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 64411fe909dSMatt Brown continue; 64511fe909dSMatt Brown } 64611fe909dSMatt Brown 64711fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 64811fe909dSMatt Brown attr->attr.mode = 0400; 64911fe909dSMatt Brown attr->read = export_attr_read; 65011fe909dSMatt Brown attr->private = __va(vals[0]); 65111fe909dSMatt Brown attr->size = vals[1]; 65211fe909dSMatt Brown 65311fe909dSMatt Brown if (attr->attr.name == NULL) { 65411fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 65511fe909dSMatt Brown kfree(attr); 65611fe909dSMatt Brown continue; 65711fe909dSMatt Brown } 65811fe909dSMatt Brown 65911fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 66011fe909dSMatt Brown if (rc) { 66111fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 66211fe909dSMatt Brown rc, prop->name); 66311fe909dSMatt Brown kfree(attr->attr.name); 66411fe909dSMatt Brown kfree(attr); 66511fe909dSMatt Brown } 66611fe909dSMatt Brown } 66711fe909dSMatt Brown 66811fe909dSMatt Brown of_node_put(np); 66911fe909dSMatt Brown } 67011fe909dSMatt Brown 671b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 672b09c2ec4SVasant Hegde { 673b09c2ec4SVasant Hegde void *addr; 674b09c2ec4SVasant Hegde uint64_t size; 675b09c2ec4SVasant Hegde int rc; 676b09c2ec4SVasant Hegde 677b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 678b962f5a4SStewart Smith return; 679b962f5a4SStewart Smith 680b09c2ec4SVasant Hegde /* Register kernel log buffer */ 681b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 6826501ab5eSPranith Kumar if (addr == NULL) 6836501ab5eSPranith Kumar return; 6846501ab5eSPranith Kumar 685b09c2ec4SVasant Hegde size = log_buf_len_get(); 6866501ab5eSPranith Kumar if (size == 0) 6876501ab5eSPranith Kumar return; 6886501ab5eSPranith Kumar 689b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 690b09c2ec4SVasant Hegde __pa(addr), size); 691b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 692b09c2ec4SVasant Hegde * know about that call 693b09c2ec4SVasant Hegde */ 694b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 695b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 696b09c2ec4SVasant Hegde "rc = %d\n", rc); 697b09c2ec4SVasant Hegde } 698608b286dSJeremy Kerr 6999e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 700ed59190eSCyril Bur { 701ed59190eSCyril Bur struct device_node *np; 702ed59190eSCyril Bur 7039e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 70447083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 70547083450SNeelesh Gupta } 70647083450SNeelesh Gupta 7073bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 7083bf57561SBenjamin Herrenschmidt { 709a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 7109f0fd049SAlistair Popple __be64 events; 7119f0fd049SAlistair Popple 7123bf57561SBenjamin Herrenschmidt set_freezable(); 7133bf57561SBenjamin Herrenschmidt do { 7143bf57561SBenjamin Herrenschmidt try_to_freeze(); 7159f0fd049SAlistair Popple opal_poll_events(&events); 7169f0fd049SAlistair Popple opal_handle_events(be64_to_cpu(events)); 717a203658bSBenjamin Herrenschmidt schedule_timeout_interruptible(timeout); 7183bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 7193bf57561SBenjamin Herrenschmidt 7203bf57561SBenjamin Herrenschmidt return 0; 7213bf57561SBenjamin Herrenschmidt } 7223bf57561SBenjamin Herrenschmidt 723a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 724a203658bSBenjamin Herrenschmidt { 725a203658bSBenjamin Herrenschmidt if (kopald_tsk) 726a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 727a203658bSBenjamin Herrenschmidt } 728a203658bSBenjamin Herrenschmidt 7293bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 7303bf57561SBenjamin Herrenschmidt { 7313bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 7323bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 7333bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 7343bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 7353bf57561SBenjamin Herrenschmidt 7363bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 737a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 7383bf57561SBenjamin Herrenschmidt } 7393bf57561SBenjamin Herrenschmidt 74014a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 74114a43e69SBenjamin Herrenschmidt { 742c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 743c1c3a526SGavin Shan int rc; 74414a43e69SBenjamin Herrenschmidt 74514a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 74614a43e69SBenjamin Herrenschmidt if (!opal_node) { 74708135139SMichael Ellerman pr_warn("Device node not found\n"); 74814a43e69SBenjamin Herrenschmidt return -ENODEV; 74914a43e69SBenjamin Herrenschmidt } 7502db29d28SBenjamin Herrenschmidt 7512db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 75214a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 7532db29d28SBenjamin Herrenschmidt if (consoles) { 75414a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 75514a43e69SBenjamin Herrenschmidt if (strcmp(np->name, "serial")) 75614a43e69SBenjamin Herrenschmidt continue; 75714a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 75814a43e69SBenjamin Herrenschmidt } 75914a43e69SBenjamin Herrenschmidt of_node_put(consoles); 7602db29d28SBenjamin Herrenschmidt } 761a125e092SBenjamin Herrenschmidt 76296e023e7SAlistair Popple /* Initialise OPAL messaging system */ 76396e023e7SAlistair Popple opal_message_init(); 76496e023e7SAlistair Popple 76596e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 76696e023e7SAlistair Popple opal_async_comp_init(); 76796e023e7SAlistair Popple 76896e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 76996e023e7SAlistair Popple opal_sensor_init(); 77096e023e7SAlistair Popple 77196e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 77296e023e7SAlistair Popple opal_hmi_handler_init(); 77396e023e7SAlistair Popple 77447083450SNeelesh Gupta /* Create i2c platform devices */ 7759e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 77647083450SNeelesh Gupta 7773bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 7783bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 7793bf57561SBenjamin Herrenschmidt 780c159b596SVasant Hegde /* Create leds platform devices */ 781c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 782c159b596SVasant Hegde if (leds) { 783c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 784c159b596SVasant Hegde of_node_put(leds); 785c159b596SVasant Hegde } 786c159b596SVasant Hegde 7879b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 7889b4fffa1SAndrew Donnellan opal_msglog_init(); 7899b4fffa1SAndrew Donnellan 7906f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 7916f68b5e2SVasant Hegde rc = opal_sysfs_init(); 79250bd6153SVasant Hegde if (rc == 0) { 793c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 794c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 795b09c2ec4SVasant Hegde /* Setup dump region interface */ 796b09c2ec4SVasant Hegde opal_dump_region_init(); 797774fea1aSStewart Smith /* Setup error log interface */ 798774fea1aSStewart Smith rc = opal_elog_init(); 79950bd6153SVasant Hegde /* Setup code update interface */ 800ed59190eSCyril Bur opal_flash_update_init(); 801c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 802c7e64b9cSStewart Smith opal_platform_dump_init(); 8034029cd66SNeelesh Gupta /* Setup system parameters interface */ 8044029cd66SNeelesh Gupta opal_sys_param_init(); 8059b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 8069b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 80750bd6153SVasant Hegde } 8086f68b5e2SVasant Hegde 80911fe909dSMatt Brown /* Export all properties */ 81011fe909dSMatt Brown opal_export_attrs(); 81111fe909dSMatt Brown 8120d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 8139e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 8149e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 8159e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 816ed59190eSCyril Bur 81743a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 8189e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 81943a1dd9bSSuraj Jitindar Singh 820affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 821affddff6SRussell Currey opal_kmsg_init(); 822affddff6SRussell Currey 82314a43e69SBenjamin Herrenschmidt return 0; 82414a43e69SBenjamin Herrenschmidt } 825b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 82673ed148aSBenjamin Herrenschmidt 82773ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 82873ed148aSBenjamin Herrenschmidt { 829f7d98d18SVasant Hegde long rc = OPAL_BUSY; 83073ed148aSBenjamin Herrenschmidt 8319f0fd049SAlistair Popple opal_event_shutdown(); 832f7d98d18SVasant Hegde 833f7d98d18SVasant Hegde /* 834f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 835f7d98d18SVasant Hegde * potentially write to our memory has completed such 836f7d98d18SVasant Hegde * as an ongoing dump retrieval 837f7d98d18SVasant Hegde */ 838f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 839f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 840f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 841f7d98d18SVasant Hegde opal_poll_events(NULL); 842f7d98d18SVasant Hegde else 843f7d98d18SVasant Hegde mdelay(10); 844f7d98d18SVasant Hegde } 845b09c2ec4SVasant Hegde 846b09c2ec4SVasant Hegde /* Unregister memory dump region */ 847b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 848b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 84973ed148aSBenjamin Herrenschmidt } 850e28b05e7SJoel Stanley 851e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 852e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 853594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 854594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 855608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 856608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 857ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 858ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 859ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 8600d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 8613441f04bSAnton Blanchard 8623441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 8633441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 8643441f04bSAnton Blanchard unsigned long vmalloc_size) 8653441f04bSAnton Blanchard { 8663441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 8673441f04bSAnton Blanchard unsigned long i = 0; 8683441f04bSAnton Blanchard 8693441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 8703441f04bSAnton Blanchard if (!sg) 8713441f04bSAnton Blanchard goto nomem; 8723441f04bSAnton Blanchard 8733441f04bSAnton Blanchard first = sg; 8743441f04bSAnton Blanchard 8753441f04bSAnton Blanchard while (vmalloc_size > 0) { 8763441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 8773441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 8783441f04bSAnton Blanchard 8793441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 8803441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 8813441f04bSAnton Blanchard i++; 8823441f04bSAnton Blanchard 8833441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 8843441f04bSAnton Blanchard struct opal_sg_list *next; 8853441f04bSAnton Blanchard 8863441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 8873441f04bSAnton Blanchard if (!next) 8883441f04bSAnton Blanchard goto nomem; 8893441f04bSAnton Blanchard 8903441f04bSAnton Blanchard sg->length = cpu_to_be64( 8913441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 8923441f04bSAnton Blanchard i = 0; 8933441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 8943441f04bSAnton Blanchard sg = next; 8953441f04bSAnton Blanchard } 8963441f04bSAnton Blanchard 8973441f04bSAnton Blanchard vmalloc_addr += length; 8983441f04bSAnton Blanchard vmalloc_size -= length; 8993441f04bSAnton Blanchard } 9003441f04bSAnton Blanchard 9013441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 9023441f04bSAnton Blanchard 9033441f04bSAnton Blanchard return first; 9043441f04bSAnton Blanchard 9053441f04bSAnton Blanchard nomem: 9063441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 9073441f04bSAnton Blanchard opal_free_sg_list(first); 9083441f04bSAnton Blanchard return NULL; 9093441f04bSAnton Blanchard } 9103441f04bSAnton Blanchard 9113441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 9123441f04bSAnton Blanchard { 9133441f04bSAnton Blanchard while (sg) { 9143441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 9153441f04bSAnton Blanchard 9163441f04bSAnton Blanchard kfree(sg); 9173441f04bSAnton Blanchard 9183441f04bSAnton Blanchard if (next) 9193441f04bSAnton Blanchard sg = __va(next); 9203441f04bSAnton Blanchard else 9213441f04bSAnton Blanchard sg = NULL; 9223441f04bSAnton Blanchard } 9233441f04bSAnton Blanchard } 92416b1d26eSNeelesh Gupta 925e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 926e3c5c2e0SCédric Le Goater { 927e3c5c2e0SCédric Le Goater switch (rc) { 928e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 929e3c5c2e0SCédric Le Goater 930e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 931e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 932e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 933e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 93414aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 935e3c5c2e0SCédric Le Goater 936e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 937e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 938e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 939e3c5c2e0SCédric Le Goater default: 940e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 941e3c5c2e0SCédric Le Goater return -EIO; 942e3c5c2e0SCédric Le Goater } 943e3c5c2e0SCédric Le Goater } 944e3c5c2e0SCédric Le Goater 9451d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 9461d0761d2SAlistair Popple { 9471d0761d2SAlistair Popple int rc; 9481d0761d2SAlistair Popple 9491d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 9501d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 9511d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 9521d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 9531d0761d2SAlistair Popple } 9541d0761d2SAlistair Popple } 9551d0761d2SAlistair Popple 95616b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 95716b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 95816b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 95916b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 96016b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 96147083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 962c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 963c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 964c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 96543a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 96643a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 967ffe6d810SPaul Mackerras /* Export this for KVM */ 968ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 969