12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 214a43e69SBenjamin Herrenschmidt /* 314a43e69SBenjamin Herrenschmidt * PowerNV OPAL high level interfaces 414a43e69SBenjamin Herrenschmidt * 514a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 614a43e69SBenjamin Herrenschmidt */ 714a43e69SBenjamin Herrenschmidt 8c8742f85SBenjamin Herrenschmidt #define pr_fmt(fmt) "opal: " fmt 914a43e69SBenjamin Herrenschmidt 10c8742f85SBenjamin Herrenschmidt #include <linux/printk.h> 1114a43e69SBenjamin Herrenschmidt #include <linux/types.h> 1214a43e69SBenjamin Herrenschmidt #include <linux/of.h> 1326a2056eSRob Herring #include <linux/of_fdt.h> 1414a43e69SBenjamin Herrenschmidt #include <linux/of_platform.h> 158f95faaaSMadhavan Srinivasan #include <linux/of_address.h> 16a125e092SBenjamin Herrenschmidt #include <linux/interrupt.h> 171bc98de2SGavin Shan #include <linux/notifier.h> 1873ed148aSBenjamin Herrenschmidt #include <linux/slab.h> 19b63a0ffeSMahesh Salgaonkar #include <linux/sched.h> 206f68b5e2SVasant Hegde #include <linux/kobject.h> 21f7d98d18SVasant Hegde #include <linux/delay.h> 2255672ecfSMahesh Salgaonkar #include <linux/memblock.h> 233bf57561SBenjamin Herrenschmidt #include <linux/kthread.h> 243bf57561SBenjamin Herrenschmidt #include <linux/freezer.h> 25b746e3e0SNicholas Piggin #include <linux/kmsg_dump.h> 26b746e3e0SNicholas Piggin #include <linux/console.h> 27b746e3e0SNicholas Piggin #include <linux/sched/debug.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> 338f95faaaSMadhavan Srinivasan #include <asm/imc-pmu.h> 346fcd6baaSNicholas Piggin #include <asm/bug.h> 3514a43e69SBenjamin Herrenschmidt 3614a43e69SBenjamin Herrenschmidt #include "powernv.h" 3714a43e69SBenjamin Herrenschmidt 386f68b5e2SVasant Hegde /* /sys/firmware/opal */ 396f68b5e2SVasant Hegde struct kobject *opal_kobj; 406f68b5e2SVasant Hegde 4114a43e69SBenjamin Herrenschmidt struct opal { 4214a43e69SBenjamin Herrenschmidt u64 base; 4314a43e69SBenjamin Herrenschmidt u64 entry; 4455672ecfSMahesh Salgaonkar u64 size; 4514a43e69SBenjamin Herrenschmidt } opal; 4614a43e69SBenjamin Herrenschmidt 4755672ecfSMahesh Salgaonkar struct mcheck_recoverable_range { 4855672ecfSMahesh Salgaonkar u64 start_addr; 4955672ecfSMahesh Salgaonkar u64 end_addr; 5055672ecfSMahesh Salgaonkar u64 recover_addr; 5155672ecfSMahesh Salgaonkar }; 5255672ecfSMahesh Salgaonkar 5355672ecfSMahesh Salgaonkar static struct mcheck_recoverable_range *mc_recoverable_range; 5455672ecfSMahesh Salgaonkar static int mc_recoverable_range_len; 5555672ecfSMahesh Salgaonkar 56bfc36894SJoel Stanley struct device_node *opal_node; 5714a43e69SBenjamin Herrenschmidt static DEFINE_SPINLOCK(opal_write_lock); 5824366360SMahesh Salgaonkar static struct atomic_notifier_head opal_msg_notifier_head[OPAL_MSG_TYPE_MAX]; 593bf57561SBenjamin Herrenschmidt static uint32_t opal_heartbeat; 60a203658bSBenjamin Herrenschmidt static struct task_struct *kopald_tsk; 612be1d5d1SVasant Hegde static struct opal_msg *opal_msg; 622be1d5d1SVasant Hegde static u32 opal_msg_size __ro_after_init; 6314a43e69SBenjamin Herrenschmidt 64d3cbff1bSBenjamin Herrenschmidt void opal_configure_cores(void) 654926616cSBenjamin Herrenschmidt { 661c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags = 0; 671c0eaf0fSBenjamin Herrenschmidt 684926616cSBenjamin Herrenschmidt /* Do the actual re-init, This will clobber all FPRs, VRs, etc... 694926616cSBenjamin Herrenschmidt * 704926616cSBenjamin Herrenschmidt * It will preserve non volatile GPRs and HSPRG0/1. It will 714926616cSBenjamin Herrenschmidt * also restore HIDs and other SPRs to their original value 724926616cSBenjamin Herrenschmidt * but it might clobber a bunch. 734926616cSBenjamin Herrenschmidt */ 744926616cSBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 751c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_BE; 764926616cSBenjamin Herrenschmidt #else 771c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_HILE_LE; 784926616cSBenjamin Herrenschmidt #endif 79d3cbff1bSBenjamin Herrenschmidt 801c0eaf0fSBenjamin Herrenschmidt /* 811c0eaf0fSBenjamin Herrenschmidt * POWER9 always support running hash: 821c0eaf0fSBenjamin Herrenschmidt * ie. Host hash supports hash guests 831c0eaf0fSBenjamin Herrenschmidt * Host radix supports hash/radix guests 841c0eaf0fSBenjamin Herrenschmidt */ 85a70b487bSMichael Ellerman if (early_cpu_has_feature(CPU_FTR_ARCH_300)) { 861c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_HASH; 871c0eaf0fSBenjamin Herrenschmidt if (early_radix_enabled()) 881c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX; 891c0eaf0fSBenjamin Herrenschmidt } 901c0eaf0fSBenjamin Herrenschmidt 911c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 921c0eaf0fSBenjamin Herrenschmidt 93d3cbff1bSBenjamin Herrenschmidt /* Restore some bits */ 94d3cbff1bSBenjamin Herrenschmidt if (cur_cpu_spec->cpu_restore) 95d3cbff1bSBenjamin Herrenschmidt cur_cpu_spec->cpu_restore(); 964926616cSBenjamin Herrenschmidt } 974926616cSBenjamin Herrenschmidt 9814a43e69SBenjamin Herrenschmidt int __init early_init_dt_scan_opal(unsigned long node, 9914a43e69SBenjamin Herrenschmidt const char *uname, int depth, void *data) 10014a43e69SBenjamin Herrenschmidt { 10155672ecfSMahesh Salgaonkar const void *basep, *entryp, *sizep; 1029d0c4dfeSRob Herring int basesz, entrysz, runtimesz; 10314a43e69SBenjamin Herrenschmidt 10414a43e69SBenjamin Herrenschmidt if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 10514a43e69SBenjamin Herrenschmidt return 0; 10614a43e69SBenjamin Herrenschmidt 10714a43e69SBenjamin Herrenschmidt basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz); 10814a43e69SBenjamin Herrenschmidt entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz); 10955672ecfSMahesh Salgaonkar sizep = of_get_flat_dt_prop(node, "opal-runtime-size", &runtimesz); 11014a43e69SBenjamin Herrenschmidt 11155672ecfSMahesh Salgaonkar if (!basep || !entryp || !sizep) 11214a43e69SBenjamin Herrenschmidt return 1; 11314a43e69SBenjamin Herrenschmidt 11414a43e69SBenjamin Herrenschmidt opal.base = of_read_number(basep, basesz/4); 11514a43e69SBenjamin Herrenschmidt opal.entry = of_read_number(entryp, entrysz/4); 11655672ecfSMahesh Salgaonkar opal.size = of_read_number(sizep, runtimesz/4); 11714a43e69SBenjamin Herrenschmidt 1189d0c4dfeSRob Herring pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%d)\n", 11914a43e69SBenjamin Herrenschmidt opal.base, basep, basesz); 1209d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%d)\n", 12114a43e69SBenjamin Herrenschmidt opal.entry, entryp, entrysz); 1229d0c4dfeSRob Herring pr_debug("OPAL Entry = 0x%llx (sizep=%p runtimesz=%d)\n", 12355672ecfSMahesh Salgaonkar opal.size, sizep, runtimesz); 12414a43e69SBenjamin Herrenschmidt 12575b93da4SBenjamin Herrenschmidt if (of_flat_dt_is_compatible(node, "ibm,opal-v3")) { 126e4d54f71SStewart Smith powerpc_firmware_features |= FW_FEATURE_OPAL; 1275138b314SBenjamin Herrenschmidt pr_debug("OPAL detected !\n"); 12814a43e69SBenjamin Herrenschmidt } else { 129786842b6SStewart Smith panic("OPAL != V3 detected, no longer supported.\n"); 13014a43e69SBenjamin Herrenschmidt } 13114a43e69SBenjamin Herrenschmidt 132c4463b37SJeremy Kerr return 1; 133c4463b37SJeremy Kerr } 134c4463b37SJeremy Kerr 13555672ecfSMahesh Salgaonkar int __init early_init_dt_scan_recoverable_ranges(unsigned long node, 13655672ecfSMahesh Salgaonkar const char *uname, int depth, void *data) 13755672ecfSMahesh Salgaonkar { 1389d0c4dfeSRob Herring int i, psize, size; 13955672ecfSMahesh Salgaonkar const __be32 *prop; 14055672ecfSMahesh Salgaonkar 14155672ecfSMahesh Salgaonkar if (depth != 1 || strcmp(uname, "ibm,opal") != 0) 14255672ecfSMahesh Salgaonkar return 0; 14355672ecfSMahesh Salgaonkar 1446e556b47SMahesh Salgaonkar prop = of_get_flat_dt_prop(node, "mcheck-recoverable-ranges", &psize); 14555672ecfSMahesh Salgaonkar 14655672ecfSMahesh Salgaonkar if (!prop) 14755672ecfSMahesh Salgaonkar return 1; 14855672ecfSMahesh Salgaonkar 14955672ecfSMahesh Salgaonkar pr_debug("Found machine check recoverable ranges.\n"); 15055672ecfSMahesh Salgaonkar 15155672ecfSMahesh Salgaonkar /* 1526e556b47SMahesh Salgaonkar * Calculate number of available entries. 1536e556b47SMahesh Salgaonkar * 1546e556b47SMahesh Salgaonkar * Each recoverable address range entry is (start address, len, 1556e556b47SMahesh Salgaonkar * recovery address), 2 cells each for start and recovery address, 1566e556b47SMahesh Salgaonkar * 1 cell for len, totalling 5 cells per entry. 1576e556b47SMahesh Salgaonkar */ 1586e556b47SMahesh Salgaonkar mc_recoverable_range_len = psize / (sizeof(*prop) * 5); 1596e556b47SMahesh Salgaonkar 1606e556b47SMahesh Salgaonkar /* Sanity check */ 1616e556b47SMahesh Salgaonkar if (!mc_recoverable_range_len) 1626e556b47SMahesh Salgaonkar return 1; 1636e556b47SMahesh Salgaonkar 1646e556b47SMahesh Salgaonkar /* Size required to hold all the entries. */ 1656e556b47SMahesh Salgaonkar size = mc_recoverable_range_len * 1666e556b47SMahesh Salgaonkar sizeof(struct mcheck_recoverable_range); 1676e556b47SMahesh Salgaonkar 1686e556b47SMahesh Salgaonkar /* 16976b42e28SNicholas Piggin * Allocate a buffer to hold the MC recoverable ranges. 17055672ecfSMahesh Salgaonkar */ 171b63a07d6SMike Rapoport mc_recoverable_range = memblock_alloc(size, __alignof__(u64)); 1728a7f97b9SMike Rapoport if (!mc_recoverable_range) 1738a7f97b9SMike Rapoport panic("%s: Failed to allocate %u bytes align=0x%lx\n", 1748a7f97b9SMike Rapoport __func__, size, __alignof__(u64)); 17555672ecfSMahesh Salgaonkar 1766e556b47SMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) { 17755672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr = 17855672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 0, 2); 17955672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr = 18055672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr + 18155672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 2, 1); 18255672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr = 18355672ecfSMahesh Salgaonkar of_read_number(prop + (i * 5) + 3, 2); 18455672ecfSMahesh Salgaonkar 18555672ecfSMahesh Salgaonkar pr_debug("Machine check recoverable range: %llx..%llx: %llx\n", 18655672ecfSMahesh Salgaonkar mc_recoverable_range[i].start_addr, 18755672ecfSMahesh Salgaonkar mc_recoverable_range[i].end_addr, 18855672ecfSMahesh Salgaonkar mc_recoverable_range[i].recover_addr); 18955672ecfSMahesh Salgaonkar } 19055672ecfSMahesh Salgaonkar return 1; 19155672ecfSMahesh Salgaonkar } 19255672ecfSMahesh Salgaonkar 193c4463b37SJeremy Kerr static int __init opal_register_exception_handlers(void) 194c4463b37SJeremy Kerr { 19529186097SBenjamin Herrenschmidt #ifdef __BIG_ENDIAN__ 196c4463b37SJeremy Kerr u64 glue; 197c4463b37SJeremy Kerr 198c4463b37SJeremy Kerr if (!(powerpc_firmware_features & FW_FEATURE_OPAL)) 199c4463b37SJeremy Kerr return -ENODEV; 200c4463b37SJeremy Kerr 20128446de2SMahesh Salgaonkar /* Hookup some exception handlers except machine check. We use the 20228446de2SMahesh Salgaonkar * fwnmi area at 0x7000 to provide the glue space to OPAL 203ed79ba9eSBenjamin Herrenschmidt */ 204ed79ba9eSBenjamin Herrenschmidt glue = 0x7000; 2056507955cSMahesh Salgaonkar 2066507955cSMahesh Salgaonkar /* 2071549c42dSStewart Smith * Only ancient OPAL firmware requires this. 2081549c42dSStewart Smith * Specifically, firmware from FW810.00 (released June 2014) 2091549c42dSStewart Smith * through FW810.20 (Released October 2014). 2106507955cSMahesh Salgaonkar * 2111549c42dSStewart Smith * Check if we are running on newer (post Oct 2014) firmware that 2121549c42dSStewart Smith * exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to 2131549c42dSStewart Smith * patch the HMI interrupt and we catch it directly in Linux. 2146507955cSMahesh Salgaonkar * 2151549c42dSStewart Smith * For older firmware (i.e < FW810.20), we fallback to old behavior and 2161549c42dSStewart Smith * let OPAL patch the HMI vector and handle it inside OPAL firmware. 2171549c42dSStewart Smith * 2181549c42dSStewart Smith * For newer firmware we catch/handle the HMI directly in Linux. 2196507955cSMahesh Salgaonkar */ 2206507955cSMahesh Salgaonkar if (!opal_check_token(OPAL_HANDLE_HMI)) { 22108135139SMichael Ellerman pr_info("Old firmware detected, OPAL handles HMIs.\n"); 2226507955cSMahesh Salgaonkar opal_register_exception_handler( 2236507955cSMahesh Salgaonkar OPAL_HYPERVISOR_MAINTENANCE_HANDLER, 2246507955cSMahesh Salgaonkar 0, glue); 2256507955cSMahesh Salgaonkar glue += 128; 2266507955cSMahesh Salgaonkar } 2276507955cSMahesh Salgaonkar 2281549c42dSStewart Smith /* 2291549c42dSStewart Smith * Only applicable to ancient firmware, all modern 2301549c42dSStewart Smith * (post March 2015/skiboot 5.0) firmware will just return 2311549c42dSStewart Smith * OPAL_UNSUPPORTED. 2321549c42dSStewart Smith */ 233ed79ba9eSBenjamin Herrenschmidt opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue); 23429186097SBenjamin Herrenschmidt #endif 235ed79ba9eSBenjamin Herrenschmidt 236c4463b37SJeremy Kerr return 0; 23714a43e69SBenjamin Herrenschmidt } 238b14726c5SMichael Ellerman machine_early_initcall(powernv, opal_register_exception_handlers); 239c4463b37SJeremy Kerr 24024366360SMahesh Salgaonkar /* 24124366360SMahesh Salgaonkar * Opal message notifier based on message type. Allow subscribers to get 24224366360SMahesh Salgaonkar * notified for specific messgae type. 24324366360SMahesh Salgaonkar */ 244d7cf83fcSMichael Ellerman int opal_message_notifier_register(enum opal_msg_type msg_type, 24524366360SMahesh Salgaonkar struct notifier_block *nb) 24624366360SMahesh Salgaonkar { 247792f96e9SNeelesh Gupta if (!nb || msg_type >= OPAL_MSG_TYPE_MAX) { 248f2c2cbccSJoe Perches pr_warn("%s: Invalid arguments, msg_type:%d\n", 24924366360SMahesh Salgaonkar __func__, msg_type); 25024366360SMahesh Salgaonkar return -EINVAL; 25124366360SMahesh Salgaonkar } 252792f96e9SNeelesh Gupta 25324366360SMahesh Salgaonkar return atomic_notifier_chain_register( 25424366360SMahesh Salgaonkar &opal_msg_notifier_head[msg_type], nb); 25524366360SMahesh Salgaonkar } 256594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_register); 25724366360SMahesh Salgaonkar 258df60f576SMichael Ellerman int opal_message_notifier_unregister(enum opal_msg_type msg_type, 259b921e902SNeelesh Gupta struct notifier_block *nb) 260b921e902SNeelesh Gupta { 261b921e902SNeelesh Gupta return atomic_notifier_chain_unregister( 262b921e902SNeelesh Gupta &opal_msg_notifier_head[msg_type], nb); 263b921e902SNeelesh Gupta } 264594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_message_notifier_unregister); 265b921e902SNeelesh Gupta 26624366360SMahesh Salgaonkar static void opal_message_do_notify(uint32_t msg_type, void *msg) 26724366360SMahesh Salgaonkar { 26824366360SMahesh Salgaonkar /* notify subscribers */ 26924366360SMahesh Salgaonkar atomic_notifier_call_chain(&opal_msg_notifier_head[msg_type], 27024366360SMahesh Salgaonkar msg_type, msg); 27124366360SMahesh Salgaonkar } 27224366360SMahesh Salgaonkar 27324366360SMahesh Salgaonkar static void opal_handle_message(void) 27424366360SMahesh Salgaonkar { 27524366360SMahesh Salgaonkar s64 ret; 276bb4398e1SAnton Blanchard u32 type; 27724366360SMahesh Salgaonkar 2782be1d5d1SVasant Hegde ret = opal_get_msg(__pa(opal_msg), opal_msg_size); 27924366360SMahesh Salgaonkar /* No opal message pending. */ 28024366360SMahesh Salgaonkar if (ret == OPAL_RESOURCE) 28124366360SMahesh Salgaonkar return; 28224366360SMahesh Salgaonkar 28324366360SMahesh Salgaonkar /* check for errors. */ 28424366360SMahesh Salgaonkar if (ret) { 285f2c2cbccSJoe Perches pr_warn("%s: Failed to retrieve opal message, err=%lld\n", 28624366360SMahesh Salgaonkar __func__, ret); 28724366360SMahesh Salgaonkar return; 28824366360SMahesh Salgaonkar } 28924366360SMahesh Salgaonkar 2902be1d5d1SVasant Hegde type = be32_to_cpu(opal_msg->msg_type); 291bb4398e1SAnton Blanchard 29224366360SMahesh Salgaonkar /* Sanity check */ 293792f96e9SNeelesh Gupta if (type >= OPAL_MSG_TYPE_MAX) { 29498da62b7SStewart Smith pr_warn_once("%s: Unknown message type: %u\n", __func__, type); 29524366360SMahesh Salgaonkar return; 29624366360SMahesh Salgaonkar } 2972be1d5d1SVasant Hegde opal_message_do_notify(type, (void *)opal_msg); 29824366360SMahesh Salgaonkar } 29924366360SMahesh Salgaonkar 300a295af24SAlistair Popple static irqreturn_t opal_message_notify(int irq, void *data) 30124366360SMahesh Salgaonkar { 30224366360SMahesh Salgaonkar opal_handle_message(); 303a295af24SAlistair Popple return IRQ_HANDLED; 30424366360SMahesh Salgaonkar } 30524366360SMahesh Salgaonkar 3062be1d5d1SVasant Hegde static int __init opal_message_init(struct device_node *opal_node) 30724366360SMahesh Salgaonkar { 308a295af24SAlistair Popple int ret, i, irq; 30924366360SMahesh Salgaonkar 3102be1d5d1SVasant Hegde ret = of_property_read_u32(opal_node, "opal-msg-size", &opal_msg_size); 3112be1d5d1SVasant Hegde if (ret) { 3122be1d5d1SVasant Hegde pr_notice("Failed to read opal-msg-size property\n"); 3132be1d5d1SVasant Hegde opal_msg_size = sizeof(struct opal_msg); 3142be1d5d1SVasant Hegde } 3152be1d5d1SVasant Hegde 3162be1d5d1SVasant Hegde opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); 3172be1d5d1SVasant Hegde if (!opal_msg) { 3182be1d5d1SVasant Hegde opal_msg_size = sizeof(struct opal_msg); 3192be1d5d1SVasant Hegde /* Try to allocate fixed message size */ 3202be1d5d1SVasant Hegde opal_msg = kmalloc(opal_msg_size, GFP_KERNEL); 3212be1d5d1SVasant Hegde BUG_ON(opal_msg == NULL); 3222be1d5d1SVasant Hegde } 3232be1d5d1SVasant Hegde 32424366360SMahesh Salgaonkar for (i = 0; i < OPAL_MSG_TYPE_MAX; i++) 32524366360SMahesh Salgaonkar ATOMIC_INIT_NOTIFIER_HEAD(&opal_msg_notifier_head[i]); 32624366360SMahesh Salgaonkar 327a295af24SAlistair Popple irq = opal_event_request(ilog2(OPAL_EVENT_MSG_PENDING)); 328a295af24SAlistair Popple if (!irq) { 329a295af24SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 330a295af24SAlistair Popple __func__, irq); 331a295af24SAlistair Popple return irq; 332a295af24SAlistair Popple } 333a295af24SAlistair Popple 334a295af24SAlistair Popple ret = request_irq(irq, opal_message_notify, 335a295af24SAlistair Popple IRQ_TYPE_LEVEL_HIGH, "opal-msg", NULL); 33624366360SMahesh Salgaonkar if (ret) { 337a295af24SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 33824366360SMahesh Salgaonkar __func__, ret); 33924366360SMahesh Salgaonkar return ret; 34024366360SMahesh Salgaonkar } 341a295af24SAlistair Popple 34224366360SMahesh Salgaonkar return 0; 34324366360SMahesh Salgaonkar } 34424366360SMahesh Salgaonkar 34514a43e69SBenjamin Herrenschmidt int opal_get_chars(uint32_t vtermno, char *buf, int count) 34614a43e69SBenjamin Herrenschmidt { 3474f89363bSBenjamin Herrenschmidt s64 rc; 3484f89363bSBenjamin Herrenschmidt __be64 evt, len; 34914a43e69SBenjamin Herrenschmidt 35014a43e69SBenjamin Herrenschmidt if (!opal.entry) 351daea1175SBenjamin Herrenschmidt return -ENODEV; 35214a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 3534f89363bSBenjamin Herrenschmidt if ((be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_INPUT) == 0) 35414a43e69SBenjamin Herrenschmidt return 0; 3554f89363bSBenjamin Herrenschmidt len = cpu_to_be64(count); 35614a43e69SBenjamin Herrenschmidt rc = opal_console_read(vtermno, &len, buf); 35714a43e69SBenjamin Herrenschmidt if (rc == OPAL_SUCCESS) 3584f89363bSBenjamin Herrenschmidt return be64_to_cpu(len); 35914a43e69SBenjamin Herrenschmidt return 0; 36014a43e69SBenjamin Herrenschmidt } 36114a43e69SBenjamin Herrenschmidt 36217cc1dd4SNicholas Piggin static int __opal_put_chars(uint32_t vtermno, const char *data, int total_len, bool atomic) 36314a43e69SBenjamin Herrenschmidt { 36417cc1dd4SNicholas Piggin unsigned long flags = 0 /* shut up gcc */; 365b74d2807SNicholas Piggin int written; 366b74d2807SNicholas Piggin __be64 olen; 367b74d2807SNicholas Piggin s64 rc; 36814a43e69SBenjamin Herrenschmidt 36914a43e69SBenjamin Herrenschmidt if (!opal.entry) 370daea1175SBenjamin Herrenschmidt return -ENODEV; 37114a43e69SBenjamin Herrenschmidt 37217cc1dd4SNicholas Piggin if (atomic) 37314a43e69SBenjamin Herrenschmidt spin_lock_irqsave(&opal_write_lock, flags); 3744f89363bSBenjamin Herrenschmidt rc = opal_console_write_buffer_space(vtermno, &olen); 375b74d2807SNicholas Piggin if (rc || be64_to_cpu(olen) < total_len) { 37614a43e69SBenjamin Herrenschmidt /* Closed -> drop characters */ 37714a43e69SBenjamin Herrenschmidt if (rc) 378b74d2807SNicholas Piggin written = total_len; 379b74d2807SNicholas Piggin else 380b74d2807SNicholas Piggin written = -EAGAIN; 381b74d2807SNicholas Piggin goto out; 38214a43e69SBenjamin Herrenschmidt } 38314a43e69SBenjamin Herrenschmidt 384b74d2807SNicholas Piggin /* Should not get a partial write here because space is available. */ 3854f89363bSBenjamin Herrenschmidt olen = cpu_to_be64(total_len); 3864f89363bSBenjamin Herrenschmidt rc = opal_console_write(vtermno, &olen, data); 387b74d2807SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 38895b861a7SNicholas Piggin if (rc == OPAL_BUSY_EVENT) 38936d2dabcSNicholas Piggin opal_poll_events(NULL); 390b74d2807SNicholas Piggin written = -EAGAIN; 391b74d2807SNicholas Piggin goto out; 39236d2dabcSNicholas Piggin } 39336d2dabcSNicholas Piggin 3941de1455fSBenjamin Herrenschmidt /* Closed or other error drop */ 39536d2dabcSNicholas Piggin if (rc != OPAL_SUCCESS) { 396b74d2807SNicholas Piggin written = opal_error_code(rc); 397b74d2807SNicholas Piggin goto out; 3981de1455fSBenjamin Herrenschmidt } 39936d2dabcSNicholas Piggin 400b74d2807SNicholas Piggin written = be64_to_cpu(olen); 401b74d2807SNicholas Piggin if (written < total_len) { 40217cc1dd4SNicholas Piggin if (atomic) { 403b74d2807SNicholas Piggin /* Should not happen */ 40417cc1dd4SNicholas Piggin pr_warn("atomic console write returned partial " 40517cc1dd4SNicholas Piggin "len=%d written=%d\n", total_len, written); 40617cc1dd4SNicholas Piggin } 407b74d2807SNicholas Piggin if (!written) 408b74d2807SNicholas Piggin written = -EAGAIN; 409b74d2807SNicholas Piggin } 410b74d2807SNicholas Piggin 411b74d2807SNicholas Piggin out: 41217cc1dd4SNicholas Piggin if (atomic) 413b74d2807SNicholas Piggin spin_unlock_irqrestore(&opal_write_lock, flags); 41436d2dabcSNicholas Piggin 415d2a2262eSNicholas Piggin return written; 416d2a2262eSNicholas Piggin } 417d2a2262eSNicholas Piggin 41817cc1dd4SNicholas Piggin int opal_put_chars(uint32_t vtermno, const char *data, int total_len) 41917cc1dd4SNicholas Piggin { 42017cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, false); 42117cc1dd4SNicholas Piggin } 42217cc1dd4SNicholas Piggin 42317cc1dd4SNicholas Piggin /* 42417cc1dd4SNicholas Piggin * opal_put_chars_atomic will not perform partial-writes. Data will be 42517cc1dd4SNicholas Piggin * atomically written to the terminal or not at all. This is not strictly 42617cc1dd4SNicholas Piggin * true at the moment because console space can race with OPAL's console 42717cc1dd4SNicholas Piggin * writes. 42817cc1dd4SNicholas Piggin */ 42917cc1dd4SNicholas Piggin int opal_put_chars_atomic(uint32_t vtermno, const char *data, int total_len) 43017cc1dd4SNicholas Piggin { 43117cc1dd4SNicholas Piggin return __opal_put_chars(vtermno, data, total_len, true); 43217cc1dd4SNicholas Piggin } 43317cc1dd4SNicholas Piggin 43495b861a7SNicholas Piggin static s64 __opal_flush_console(uint32_t vtermno) 435d2a2262eSNicholas Piggin { 436d2a2262eSNicholas Piggin s64 rc; 437d2a2262eSNicholas Piggin 438d2a2262eSNicholas Piggin if (!opal_check_token(OPAL_CONSOLE_FLUSH)) { 439d2a2262eSNicholas Piggin __be64 evt; 440d2a2262eSNicholas Piggin 441d2a2262eSNicholas Piggin /* 442d2a2262eSNicholas Piggin * If OPAL_CONSOLE_FLUSH is not implemented in the firmware, 443d2a2262eSNicholas Piggin * the console can still be flushed by calling the polling 444d2a2262eSNicholas Piggin * function while it has OPAL_EVENT_CONSOLE_OUTPUT events. 445d2a2262eSNicholas Piggin */ 44695b861a7SNicholas Piggin WARN_ONCE(1, "opal: OPAL_CONSOLE_FLUSH missing.\n"); 44795b861a7SNicholas Piggin 44814a43e69SBenjamin Herrenschmidt opal_poll_events(&evt); 44995b861a7SNicholas Piggin if (!(be64_to_cpu(evt) & OPAL_EVENT_CONSOLE_OUTPUT)) 450d2a2262eSNicholas Piggin return OPAL_SUCCESS; 45195b861a7SNicholas Piggin return OPAL_BUSY; 452d2a2262eSNicholas Piggin 45395b861a7SNicholas Piggin } else { 454d2a2262eSNicholas Piggin rc = opal_console_flush(vtermno); 455d2a2262eSNicholas Piggin if (rc == OPAL_BUSY_EVENT) { 456d2a2262eSNicholas Piggin opal_poll_events(NULL); 45795b861a7SNicholas Piggin rc = OPAL_BUSY; 458d2a2262eSNicholas Piggin } 45995b861a7SNicholas Piggin return rc; 460d2a2262eSNicholas Piggin } 46195b861a7SNicholas Piggin 46295b861a7SNicholas Piggin } 46395b861a7SNicholas Piggin 46495b861a7SNicholas Piggin /* 46595b861a7SNicholas Piggin * opal_flush_console spins until the console is flushed 46695b861a7SNicholas Piggin */ 46795b861a7SNicholas Piggin int opal_flush_console(uint32_t vtermno) 46895b861a7SNicholas Piggin { 46995b861a7SNicholas Piggin for (;;) { 47095b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 47195b861a7SNicholas Piggin 47295b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 47395b861a7SNicholas Piggin mdelay(1); 47495b861a7SNicholas Piggin continue; 47595b861a7SNicholas Piggin } 476d2a2262eSNicholas Piggin 477d2a2262eSNicholas Piggin return opal_error_code(rc); 47814a43e69SBenjamin Herrenschmidt } 47995b861a7SNicholas Piggin } 48095b861a7SNicholas Piggin 48195b861a7SNicholas Piggin /* 48295b861a7SNicholas Piggin * opal_flush_chars is an hvc interface that sleeps until the console is 48395b861a7SNicholas Piggin * flushed if wait, otherwise it will return -EBUSY if the console has data, 48495b861a7SNicholas Piggin * -EAGAIN if it has data and some of it was flushed. 48595b861a7SNicholas Piggin */ 48695b861a7SNicholas Piggin int opal_flush_chars(uint32_t vtermno, bool wait) 48795b861a7SNicholas Piggin { 48895b861a7SNicholas Piggin for (;;) { 48995b861a7SNicholas Piggin s64 rc = __opal_flush_console(vtermno); 49095b861a7SNicholas Piggin 49195b861a7SNicholas Piggin if (rc == OPAL_BUSY || rc == OPAL_PARTIAL) { 49295b861a7SNicholas Piggin if (wait) { 49395b861a7SNicholas Piggin msleep(OPAL_BUSY_DELAY_MS); 49495b861a7SNicholas Piggin continue; 49595b861a7SNicholas Piggin } 49695b861a7SNicholas Piggin if (rc == OPAL_PARTIAL) 49795b861a7SNicholas Piggin return -EAGAIN; 49895b861a7SNicholas Piggin } 49995b861a7SNicholas Piggin 50095b861a7SNicholas Piggin return opal_error_code(rc); 50195b861a7SNicholas Piggin } 50295b861a7SNicholas Piggin } 50314a43e69SBenjamin Herrenschmidt 504b63a0ffeSMahesh Salgaonkar static int opal_recover_mce(struct pt_regs *regs, 505b63a0ffeSMahesh Salgaonkar struct machine_check_event *evt) 506b63a0ffeSMahesh Salgaonkar { 507b63a0ffeSMahesh Salgaonkar int recovered = 0; 508b63a0ffeSMahesh Salgaonkar 509b63a0ffeSMahesh Salgaonkar if (!(regs->msr & MSR_RI)) { 510b63a0ffeSMahesh Salgaonkar /* If MSR_RI isn't set, we cannot recover */ 511c74dd88eSMahesh Salgaonkar pr_err("Machine check interrupt unrecoverable: MSR(RI=0)\n"); 512b63a0ffeSMahesh Salgaonkar recovered = 0; 513b63a0ffeSMahesh Salgaonkar } else if (evt->disposition == MCE_DISPOSITION_RECOVERED) { 514b63a0ffeSMahesh Salgaonkar /* Platform corrected itself */ 515b63a0ffeSMahesh Salgaonkar recovered = 1; 5161363875bSNicholas Piggin } else if (evt->severity == MCE_SEV_FATAL) { 5171363875bSNicholas Piggin /* Fatal machine check */ 5181363875bSNicholas Piggin pr_err("Machine check interrupt is fatal\n"); 5191363875bSNicholas Piggin recovered = 0; 5206fcd6baaSNicholas Piggin } 5216fcd6baaSNicholas Piggin 522cda6618dSMahesh Salgaonkar if (!recovered && evt->sync_error) { 523b63a0ffeSMahesh Salgaonkar /* 5246fcd6baaSNicholas Piggin * Try to kill processes if we get a synchronous machine check 5256fcd6baaSNicholas Piggin * (e.g., one caused by execution of this instruction). This 5266fcd6baaSNicholas Piggin * will devolve into a panic if we try to kill init or are in 5276fcd6baaSNicholas Piggin * an interrupt etc. 528b63a0ffeSMahesh Salgaonkar * 529b63a0ffeSMahesh Salgaonkar * TODO: Queue up this address for hwpoisioning later. 5306fcd6baaSNicholas Piggin * TODO: This is not quite right for d-side machine 5316fcd6baaSNicholas Piggin * checks ->nip is not necessarily the important 5326fcd6baaSNicholas Piggin * address. 533b63a0ffeSMahesh Salgaonkar */ 5346fcd6baaSNicholas Piggin if ((user_mode(regs))) { 535b63a0ffeSMahesh Salgaonkar _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip); 536b63a0ffeSMahesh Salgaonkar recovered = 1; 5376fcd6baaSNicholas Piggin } else if (die_will_crash()) { 5386fcd6baaSNicholas Piggin /* 5396fcd6baaSNicholas Piggin * die() would kill the kernel, so better to go via 5406fcd6baaSNicholas Piggin * the platform reboot code that will log the 5416fcd6baaSNicholas Piggin * machine check. 5426fcd6baaSNicholas Piggin */ 5436fcd6baaSNicholas Piggin recovered = 0; 5446fcd6baaSNicholas Piggin } else { 5456fcd6baaSNicholas Piggin die("Machine check", regs, SIGBUS); 5466fcd6baaSNicholas Piggin recovered = 1; 547b63a0ffeSMahesh Salgaonkar } 5486fcd6baaSNicholas Piggin } 5496fcd6baaSNicholas Piggin 550b63a0ffeSMahesh Salgaonkar return recovered; 551b63a0ffeSMahesh Salgaonkar } 552b63a0ffeSMahesh Salgaonkar 55362dea077SBreno Leitao void __noreturn pnv_platform_error_reboot(struct pt_regs *regs, const char *msg) 554b746e3e0SNicholas Piggin { 55535adacd6SNicholas Piggin panic_flush_kmsg_start(); 55635adacd6SNicholas Piggin 557b746e3e0SNicholas Piggin pr_emerg("Hardware platform error: %s\n", msg); 558b746e3e0SNicholas Piggin if (regs) 559b746e3e0SNicholas Piggin show_regs(regs); 560b746e3e0SNicholas Piggin smp_send_stop(); 56135adacd6SNicholas Piggin 56235adacd6SNicholas Piggin panic_flush_kmsg_end(); 563b746e3e0SNicholas Piggin 564b746e3e0SNicholas Piggin /* 565b746e3e0SNicholas Piggin * Don't bother to shut things down because this will 566b746e3e0SNicholas Piggin * xstop the system. 567b746e3e0SNicholas Piggin */ 568b746e3e0SNicholas Piggin if (opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, msg) 569b746e3e0SNicholas Piggin == OPAL_UNSUPPORTED) { 570b746e3e0SNicholas Piggin pr_emerg("Reboot type %d not supported for %s\n", 571b746e3e0SNicholas Piggin OPAL_REBOOT_PLATFORM_ERROR, msg); 572b746e3e0SNicholas Piggin } 573b746e3e0SNicholas Piggin 574b746e3e0SNicholas Piggin /* 575b746e3e0SNicholas Piggin * We reached here. There can be three possibilities: 576b746e3e0SNicholas Piggin * 1. We are running on a firmware level that do not support 577b746e3e0SNicholas Piggin * opal_cec_reboot2() 578b746e3e0SNicholas Piggin * 2. We are running on a firmware level that do not support 579b746e3e0SNicholas Piggin * OPAL_REBOOT_PLATFORM_ERROR reboot type. 580b746e3e0SNicholas Piggin * 3. We are running on FSP based system that does not need 581b746e3e0SNicholas Piggin * opal to trigger checkstop explicitly for error analysis. 582b746e3e0SNicholas Piggin * The FSP PRD component would have already got notified 583b746e3e0SNicholas Piggin * about this error through other channels. 5845ee573e8SBalbir Singh * 4. We are running on a newer skiboot that by default does 5855ee573e8SBalbir Singh * not cause a checkstop, drops us back to the kernel to 5865ee573e8SBalbir Singh * extract context and state at the time of the error. 587b746e3e0SNicholas Piggin */ 588b746e3e0SNicholas Piggin 5895ee573e8SBalbir Singh panic(msg); 590b746e3e0SNicholas Piggin } 591b746e3e0SNicholas Piggin 592ed79ba9eSBenjamin Herrenschmidt int opal_machine_check(struct pt_regs *regs) 593ed79ba9eSBenjamin Herrenschmidt { 59436df96f8SMahesh Salgaonkar struct machine_check_event evt; 595ed79ba9eSBenjamin Herrenschmidt 59636df96f8SMahesh Salgaonkar if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) 59736df96f8SMahesh Salgaonkar return 0; 598ed79ba9eSBenjamin Herrenschmidt 599ed79ba9eSBenjamin Herrenschmidt /* Print things out */ 60036df96f8SMahesh Salgaonkar if (evt.version != MCE_V1) { 601ed79ba9eSBenjamin Herrenschmidt pr_err("Machine Check Exception, Unknown event version %d !\n", 602ed79ba9eSBenjamin Herrenschmidt evt.version); 603ed79ba9eSBenjamin Herrenschmidt return 0; 604ed79ba9eSBenjamin Herrenschmidt } 605c0577201SPaul Mackerras machine_check_print_event_info(&evt, user_mode(regs), false); 606ed79ba9eSBenjamin Herrenschmidt 607b63a0ffeSMahesh Salgaonkar if (opal_recover_mce(regs, &evt)) 608b63a0ffeSMahesh Salgaonkar return 1; 609e784b649SMahesh Salgaonkar 610b746e3e0SNicholas Piggin pnv_platform_error_reboot(regs, "Unrecoverable Machine Check exception"); 611ed79ba9eSBenjamin Herrenschmidt } 612ed79ba9eSBenjamin Herrenschmidt 6130869b6fdSMahesh Salgaonkar /* Early hmi handler called in real mode. */ 6140869b6fdSMahesh Salgaonkar int opal_hmi_exception_early(struct pt_regs *regs) 6150869b6fdSMahesh Salgaonkar { 6160ef95b41SMahesh Salgaonkar s64 rc; 6170ef95b41SMahesh Salgaonkar 6180ef95b41SMahesh Salgaonkar /* 6190ef95b41SMahesh Salgaonkar * call opal hmi handler. Pass paca address as token. 6200ef95b41SMahesh Salgaonkar * The return value OPAL_SUCCESS is an indication that there is 6210ef95b41SMahesh Salgaonkar * an HMI event generated waiting to pull by Linux. 6220ef95b41SMahesh Salgaonkar */ 6230ef95b41SMahesh Salgaonkar rc = opal_handle_hmi(); 6240ef95b41SMahesh Salgaonkar if (rc == OPAL_SUCCESS) { 6250ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 1; 6260ef95b41SMahesh Salgaonkar return 1; 6270ef95b41SMahesh Salgaonkar } 6280869b6fdSMahesh Salgaonkar return 0; 6290869b6fdSMahesh Salgaonkar } 6300869b6fdSMahesh Salgaonkar 631de269129SMahesh Salgaonkar int opal_hmi_exception_early2(struct pt_regs *regs) 632de269129SMahesh Salgaonkar { 633de269129SMahesh Salgaonkar s64 rc; 634de269129SMahesh Salgaonkar __be64 out_flags; 635de269129SMahesh Salgaonkar 636de269129SMahesh Salgaonkar /* 637de269129SMahesh Salgaonkar * call opal hmi handler. 638de269129SMahesh Salgaonkar * Check 64-bit flag mask to find out if an event was generated, 639de269129SMahesh Salgaonkar * and whether TB is still valid or not etc. 640de269129SMahesh Salgaonkar */ 641de269129SMahesh Salgaonkar rc = opal_handle_hmi2(&out_flags); 642de269129SMahesh Salgaonkar if (rc != OPAL_SUCCESS) 643de269129SMahesh Salgaonkar return 0; 644de269129SMahesh Salgaonkar 645de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT) 646de269129SMahesh Salgaonkar local_paca->hmi_event_available = 1; 647de269129SMahesh Salgaonkar if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL) 648de269129SMahesh Salgaonkar tb_invalid = true; 649de269129SMahesh Salgaonkar return 1; 650de269129SMahesh Salgaonkar } 651de269129SMahesh Salgaonkar 6520869b6fdSMahesh Salgaonkar /* HMI exception handler called in virtual mode during check_irq_replay. */ 6530869b6fdSMahesh Salgaonkar int opal_handle_hmi_exception(struct pt_regs *regs) 6540869b6fdSMahesh Salgaonkar { 6550ef95b41SMahesh Salgaonkar /* 6560ef95b41SMahesh Salgaonkar * Check if HMI event is available. 65756c0b48bSNicholas Piggin * if Yes, then wake kopald to process them. 6580ef95b41SMahesh Salgaonkar */ 6590ef95b41SMahesh Salgaonkar if (!local_paca->hmi_event_available) 6600869b6fdSMahesh Salgaonkar return 0; 6610ef95b41SMahesh Salgaonkar 6620ef95b41SMahesh Salgaonkar local_paca->hmi_event_available = 0; 66356c0b48bSNicholas Piggin opal_wake_poller(); 6640ef95b41SMahesh Salgaonkar 6650ef95b41SMahesh Salgaonkar return 1; 6660869b6fdSMahesh Salgaonkar } 6670869b6fdSMahesh Salgaonkar 66855672ecfSMahesh Salgaonkar static uint64_t find_recovery_address(uint64_t nip) 66955672ecfSMahesh Salgaonkar { 67055672ecfSMahesh Salgaonkar int i; 67155672ecfSMahesh Salgaonkar 67255672ecfSMahesh Salgaonkar for (i = 0; i < mc_recoverable_range_len; i++) 67355672ecfSMahesh Salgaonkar if ((nip >= mc_recoverable_range[i].start_addr) && 67455672ecfSMahesh Salgaonkar (nip < mc_recoverable_range[i].end_addr)) 67555672ecfSMahesh Salgaonkar return mc_recoverable_range[i].recover_addr; 67655672ecfSMahesh Salgaonkar return 0; 67755672ecfSMahesh Salgaonkar } 67855672ecfSMahesh Salgaonkar 67955672ecfSMahesh Salgaonkar bool opal_mce_check_early_recovery(struct pt_regs *regs) 68055672ecfSMahesh Salgaonkar { 68155672ecfSMahesh Salgaonkar uint64_t recover_addr = 0; 68255672ecfSMahesh Salgaonkar 68355672ecfSMahesh Salgaonkar if (!opal.base || !opal.size) 68455672ecfSMahesh Salgaonkar goto out; 68555672ecfSMahesh Salgaonkar 68655672ecfSMahesh Salgaonkar if ((regs->nip >= opal.base) && 687dc3799bbSAndrew Donnellan (regs->nip < (opal.base + opal.size))) 68855672ecfSMahesh Salgaonkar recover_addr = find_recovery_address(regs->nip); 68955672ecfSMahesh Salgaonkar 69055672ecfSMahesh Salgaonkar /* 69155672ecfSMahesh Salgaonkar * Setup regs->nip to rfi into fixup address. 69255672ecfSMahesh Salgaonkar */ 69355672ecfSMahesh Salgaonkar if (recover_addr) 69455672ecfSMahesh Salgaonkar regs->nip = recover_addr; 69555672ecfSMahesh Salgaonkar 69655672ecfSMahesh Salgaonkar out: 69755672ecfSMahesh Salgaonkar return !!recover_addr; 69855672ecfSMahesh Salgaonkar } 69955672ecfSMahesh Salgaonkar 7006f68b5e2SVasant Hegde static int opal_sysfs_init(void) 7016f68b5e2SVasant Hegde { 7026f68b5e2SVasant Hegde opal_kobj = kobject_create_and_add("opal", firmware_kobj); 7036f68b5e2SVasant Hegde if (!opal_kobj) { 7046f68b5e2SVasant Hegde pr_warn("kobject_create_and_add opal failed\n"); 7056f68b5e2SVasant Hegde return -ENOMEM; 7066f68b5e2SVasant Hegde } 7076f68b5e2SVasant Hegde 7086f68b5e2SVasant Hegde return 0; 7096f68b5e2SVasant Hegde } 7106f68b5e2SVasant Hegde 711c8742f85SBenjamin Herrenschmidt static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj, 712c8742f85SBenjamin Herrenschmidt struct bin_attribute *bin_attr, 713c8742f85SBenjamin Herrenschmidt char *buf, loff_t off, size_t count) 714c8742f85SBenjamin Herrenschmidt { 715c8742f85SBenjamin Herrenschmidt return memory_read_from_buffer(buf, count, &off, bin_attr->private, 716c8742f85SBenjamin Herrenschmidt bin_attr->size); 717c8742f85SBenjamin Herrenschmidt } 718c8742f85SBenjamin Herrenschmidt 719e7de4f7bSAndrew Donnellan static struct bin_attribute symbol_map_attr = { 720e7de4f7bSAndrew Donnellan .attr = {.name = "symbol_map", .mode = 0400}, 721e7de4f7bSAndrew Donnellan .read = symbol_map_read 722e7de4f7bSAndrew Donnellan }; 723c8742f85SBenjamin Herrenschmidt 724c8742f85SBenjamin Herrenschmidt static void opal_export_symmap(void) 725c8742f85SBenjamin Herrenschmidt { 726c8742f85SBenjamin Herrenschmidt const __be64 *syms; 727c8742f85SBenjamin Herrenschmidt unsigned int size; 728c8742f85SBenjamin Herrenschmidt struct device_node *fw; 729c8742f85SBenjamin Herrenschmidt int rc; 730c8742f85SBenjamin Herrenschmidt 731c8742f85SBenjamin Herrenschmidt fw = of_find_node_by_path("/ibm,opal/firmware"); 732c8742f85SBenjamin Herrenschmidt if (!fw) 733c8742f85SBenjamin Herrenschmidt return; 734c8742f85SBenjamin Herrenschmidt syms = of_get_property(fw, "symbol-map", &size); 735c8742f85SBenjamin Herrenschmidt if (!syms || size != 2 * sizeof(__be64)) 736c8742f85SBenjamin Herrenschmidt return; 737c8742f85SBenjamin Herrenschmidt 738c8742f85SBenjamin Herrenschmidt /* Setup attributes */ 739e7de4f7bSAndrew Donnellan symbol_map_attr.private = __va(be64_to_cpu(syms[0])); 740e7de4f7bSAndrew Donnellan symbol_map_attr.size = be64_to_cpu(syms[1]); 741c8742f85SBenjamin Herrenschmidt 742e7de4f7bSAndrew Donnellan rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr); 743c8742f85SBenjamin Herrenschmidt if (rc) 744c8742f85SBenjamin Herrenschmidt pr_warn("Error %d creating OPAL symbols file\n", rc); 745c8742f85SBenjamin Herrenschmidt } 746c8742f85SBenjamin Herrenschmidt 74711fe909dSMatt Brown static ssize_t export_attr_read(struct file *fp, struct kobject *kobj, 74811fe909dSMatt Brown struct bin_attribute *bin_attr, char *buf, 74911fe909dSMatt Brown loff_t off, size_t count) 75011fe909dSMatt Brown { 75111fe909dSMatt Brown return memory_read_from_buffer(buf, count, &off, bin_attr->private, 75211fe909dSMatt Brown bin_attr->size); 75311fe909dSMatt Brown } 75411fe909dSMatt Brown 75511fe909dSMatt Brown /* 75611fe909dSMatt Brown * opal_export_attrs: creates a sysfs node for each property listed in 75711fe909dSMatt Brown * the device-tree under /ibm,opal/firmware/exports/ 75811fe909dSMatt Brown * All new sysfs nodes are created under /opal/exports/. 75911fe909dSMatt Brown * This allows for reserved memory regions (e.g. HDAT) to be read. 76011fe909dSMatt Brown * The new sysfs nodes are only readable by root. 76111fe909dSMatt Brown */ 76211fe909dSMatt Brown static void opal_export_attrs(void) 76311fe909dSMatt Brown { 76411fe909dSMatt Brown struct bin_attribute *attr; 76511fe909dSMatt Brown struct device_node *np; 76611fe909dSMatt Brown struct property *prop; 76711fe909dSMatt Brown struct kobject *kobj; 76811fe909dSMatt Brown u64 vals[2]; 76911fe909dSMatt Brown int rc; 77011fe909dSMatt Brown 77111fe909dSMatt Brown np = of_find_node_by_path("/ibm,opal/firmware/exports"); 77211fe909dSMatt Brown if (!np) 77311fe909dSMatt Brown return; 77411fe909dSMatt Brown 77511fe909dSMatt Brown /* Create new 'exports' directory - /sys/firmware/opal/exports */ 77611fe909dSMatt Brown kobj = kobject_create_and_add("exports", opal_kobj); 77711fe909dSMatt Brown if (!kobj) { 77811fe909dSMatt Brown pr_warn("kobject_create_and_add() of exports failed\n"); 77911fe909dSMatt Brown return; 78011fe909dSMatt Brown } 78111fe909dSMatt Brown 78211fe909dSMatt Brown for_each_property_of_node(np, prop) { 78311fe909dSMatt Brown if (!strcmp(prop->name, "name") || !strcmp(prop->name, "phandle")) 78411fe909dSMatt Brown continue; 78511fe909dSMatt Brown 78611fe909dSMatt Brown if (of_property_read_u64_array(np, prop->name, &vals[0], 2)) 78711fe909dSMatt Brown continue; 78811fe909dSMatt Brown 78983c49190SMichael Ellerman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 79011fe909dSMatt Brown 79111fe909dSMatt Brown if (attr == NULL) { 79211fe909dSMatt Brown pr_warn("Failed kmalloc for bin_attribute!"); 79311fe909dSMatt Brown continue; 79411fe909dSMatt Brown } 79511fe909dSMatt Brown 79683c49190SMichael Ellerman sysfs_bin_attr_init(attr); 79711fe909dSMatt Brown attr->attr.name = kstrdup(prop->name, GFP_KERNEL); 79811fe909dSMatt Brown attr->attr.mode = 0400; 79911fe909dSMatt Brown attr->read = export_attr_read; 80011fe909dSMatt Brown attr->private = __va(vals[0]); 80111fe909dSMatt Brown attr->size = vals[1]; 80211fe909dSMatt Brown 80311fe909dSMatt Brown if (attr->attr.name == NULL) { 80411fe909dSMatt Brown pr_warn("Failed kstrdup for bin_attribute attr.name"); 80511fe909dSMatt Brown kfree(attr); 80611fe909dSMatt Brown continue; 80711fe909dSMatt Brown } 80811fe909dSMatt Brown 80911fe909dSMatt Brown rc = sysfs_create_bin_file(kobj, attr); 81011fe909dSMatt Brown if (rc) { 81111fe909dSMatt Brown pr_warn("Error %d creating OPAL sysfs exports/%s file\n", 81211fe909dSMatt Brown rc, prop->name); 81311fe909dSMatt Brown kfree(attr->attr.name); 81411fe909dSMatt Brown kfree(attr); 81511fe909dSMatt Brown } 81611fe909dSMatt Brown } 81711fe909dSMatt Brown 81811fe909dSMatt Brown of_node_put(np); 81911fe909dSMatt Brown } 82011fe909dSMatt Brown 821b09c2ec4SVasant Hegde static void __init opal_dump_region_init(void) 822b09c2ec4SVasant Hegde { 823b09c2ec4SVasant Hegde void *addr; 824b09c2ec4SVasant Hegde uint64_t size; 825b09c2ec4SVasant Hegde int rc; 826b09c2ec4SVasant Hegde 827b962f5a4SStewart Smith if (!opal_check_token(OPAL_REGISTER_DUMP_REGION)) 828b962f5a4SStewart Smith return; 829b962f5a4SStewart Smith 830b09c2ec4SVasant Hegde /* Register kernel log buffer */ 831b09c2ec4SVasant Hegde addr = log_buf_addr_get(); 8326501ab5eSPranith Kumar if (addr == NULL) 8336501ab5eSPranith Kumar return; 8346501ab5eSPranith Kumar 835b09c2ec4SVasant Hegde size = log_buf_len_get(); 8366501ab5eSPranith Kumar if (size == 0) 8376501ab5eSPranith Kumar return; 8386501ab5eSPranith Kumar 839b09c2ec4SVasant Hegde rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF, 840b09c2ec4SVasant Hegde __pa(addr), size); 841b09c2ec4SVasant Hegde /* Don't warn if this is just an older OPAL that doesn't 842b09c2ec4SVasant Hegde * know about that call 843b09c2ec4SVasant Hegde */ 844b09c2ec4SVasant Hegde if (rc && rc != OPAL_UNSUPPORTED) 845b09c2ec4SVasant Hegde pr_warn("DUMP: Failed to register kernel log buffer. " 846b09c2ec4SVasant Hegde "rc = %d\n", rc); 847b09c2ec4SVasant Hegde } 848608b286dSJeremy Kerr 8499e4f51bdSJack Miller static void opal_pdev_init(const char *compatible) 850ed59190eSCyril Bur { 851ed59190eSCyril Bur struct device_node *np; 852ed59190eSCyril Bur 8539e4f51bdSJack Miller for_each_compatible_node(np, NULL, compatible) 85447083450SNeelesh Gupta of_platform_device_create(np, NULL, NULL); 85547083450SNeelesh Gupta } 85647083450SNeelesh Gupta 8578f95faaaSMadhavan Srinivasan static void __init opal_imc_init_dev(void) 8588f95faaaSMadhavan Srinivasan { 8598f95faaaSMadhavan Srinivasan struct device_node *np; 8608f95faaaSMadhavan Srinivasan 8618f95faaaSMadhavan Srinivasan np = of_find_compatible_node(NULL, NULL, IMC_DTB_COMPAT); 8628f95faaaSMadhavan Srinivasan if (np) 8638f95faaaSMadhavan Srinivasan of_platform_device_create(np, NULL, NULL); 8648f95faaaSMadhavan Srinivasan } 8658f95faaaSMadhavan Srinivasan 8663bf57561SBenjamin Herrenschmidt static int kopald(void *unused) 8673bf57561SBenjamin Herrenschmidt { 868a203658bSBenjamin Herrenschmidt unsigned long timeout = msecs_to_jiffies(opal_heartbeat) + 1; 8699f0fd049SAlistair Popple 8703bf57561SBenjamin Herrenschmidt set_freezable(); 8713bf57561SBenjamin Herrenschmidt do { 8723bf57561SBenjamin Herrenschmidt try_to_freeze(); 87356c0b48bSNicholas Piggin 87456c0b48bSNicholas Piggin opal_handle_events(); 87556c0b48bSNicholas Piggin 87656c0b48bSNicholas Piggin set_current_state(TASK_INTERRUPTIBLE); 87756c0b48bSNicholas Piggin if (opal_have_pending_events()) 87856c0b48bSNicholas Piggin __set_current_state(TASK_RUNNING); 87956c0b48bSNicholas Piggin else 88056c0b48bSNicholas Piggin schedule_timeout(timeout); 88156c0b48bSNicholas Piggin 8823bf57561SBenjamin Herrenschmidt } while (!kthread_should_stop()); 8833bf57561SBenjamin Herrenschmidt 8843bf57561SBenjamin Herrenschmidt return 0; 8853bf57561SBenjamin Herrenschmidt } 8863bf57561SBenjamin Herrenschmidt 887a203658bSBenjamin Herrenschmidt void opal_wake_poller(void) 888a203658bSBenjamin Herrenschmidt { 889a203658bSBenjamin Herrenschmidt if (kopald_tsk) 890a203658bSBenjamin Herrenschmidt wake_up_process(kopald_tsk); 891a203658bSBenjamin Herrenschmidt } 892a203658bSBenjamin Herrenschmidt 8933bf57561SBenjamin Herrenschmidt static void opal_init_heartbeat(void) 8943bf57561SBenjamin Herrenschmidt { 8953bf57561SBenjamin Herrenschmidt /* Old firwmware, we assume the HVC heartbeat is sufficient */ 8963bf57561SBenjamin Herrenschmidt if (of_property_read_u32(opal_node, "ibm,heartbeat-ms", 8973bf57561SBenjamin Herrenschmidt &opal_heartbeat) != 0) 8983bf57561SBenjamin Herrenschmidt opal_heartbeat = 0; 8993bf57561SBenjamin Herrenschmidt 9003bf57561SBenjamin Herrenschmidt if (opal_heartbeat) 901a203658bSBenjamin Herrenschmidt kopald_tsk = kthread_run(kopald, NULL, "kopald"); 9023bf57561SBenjamin Herrenschmidt } 9033bf57561SBenjamin Herrenschmidt 90414a43e69SBenjamin Herrenschmidt static int __init opal_init(void) 90514a43e69SBenjamin Herrenschmidt { 906c159b596SVasant Hegde struct device_node *np, *consoles, *leds; 907c1c3a526SGavin Shan int rc; 90814a43e69SBenjamin Herrenschmidt 90914a43e69SBenjamin Herrenschmidt opal_node = of_find_node_by_path("/ibm,opal"); 91014a43e69SBenjamin Herrenschmidt if (!opal_node) { 91108135139SMichael Ellerman pr_warn("Device node not found\n"); 91214a43e69SBenjamin Herrenschmidt return -ENODEV; 91314a43e69SBenjamin Herrenschmidt } 9142db29d28SBenjamin Herrenschmidt 9152db29d28SBenjamin Herrenschmidt /* Register OPAL consoles if any ports */ 91614a43e69SBenjamin Herrenschmidt consoles = of_find_node_by_path("/ibm,opal/consoles"); 9172db29d28SBenjamin Herrenschmidt if (consoles) { 91814a43e69SBenjamin Herrenschmidt for_each_child_of_node(consoles, np) { 9192c8e65b5SRob Herring if (!of_node_name_eq(np, "serial")) 92014a43e69SBenjamin Herrenschmidt continue; 92114a43e69SBenjamin Herrenschmidt of_platform_device_create(np, NULL, NULL); 92214a43e69SBenjamin Herrenschmidt } 92314a43e69SBenjamin Herrenschmidt of_node_put(consoles); 9242db29d28SBenjamin Herrenschmidt } 925a125e092SBenjamin Herrenschmidt 92696e023e7SAlistair Popple /* Initialise OPAL messaging system */ 9272be1d5d1SVasant Hegde opal_message_init(opal_node); 92896e023e7SAlistair Popple 92996e023e7SAlistair Popple /* Initialise OPAL asynchronous completion interface */ 93096e023e7SAlistair Popple opal_async_comp_init(); 93196e023e7SAlistair Popple 93296e023e7SAlistair Popple /* Initialise OPAL sensor interface */ 93396e023e7SAlistair Popple opal_sensor_init(); 93496e023e7SAlistair Popple 93596e023e7SAlistair Popple /* Initialise OPAL hypervisor maintainence interrupt handling */ 93696e023e7SAlistair Popple opal_hmi_handler_init(); 93796e023e7SAlistair Popple 93847083450SNeelesh Gupta /* Create i2c platform devices */ 9399e4f51bdSJack Miller opal_pdev_init("ibm,opal-i2c"); 94047083450SNeelesh Gupta 9413013e173SOliver O'Halloran /* Handle non-volatile memory devices */ 9423013e173SOliver O'Halloran opal_pdev_init("pmem-region"); 9433013e173SOliver O'Halloran 9443bf57561SBenjamin Herrenschmidt /* Setup a heatbeat thread if requested by OPAL */ 9453bf57561SBenjamin Herrenschmidt opal_init_heartbeat(); 9463bf57561SBenjamin Herrenschmidt 9478f95faaaSMadhavan Srinivasan /* Detect In-Memory Collection counters and create devices*/ 9488f95faaaSMadhavan Srinivasan opal_imc_init_dev(); 9498f95faaaSMadhavan Srinivasan 950c159b596SVasant Hegde /* Create leds platform devices */ 951c159b596SVasant Hegde leds = of_find_node_by_path("/ibm,opal/leds"); 952c159b596SVasant Hegde if (leds) { 953c159b596SVasant Hegde of_platform_device_create(leds, "opal_leds", NULL); 954c159b596SVasant Hegde of_node_put(leds); 955c159b596SVasant Hegde } 956c159b596SVasant Hegde 9579b4fffa1SAndrew Donnellan /* Initialise OPAL message log interface */ 9589b4fffa1SAndrew Donnellan opal_msglog_init(); 9599b4fffa1SAndrew Donnellan 9606f68b5e2SVasant Hegde /* Create "opal" kobject under /sys/firmware */ 9616f68b5e2SVasant Hegde rc = opal_sysfs_init(); 96250bd6153SVasant Hegde if (rc == 0) { 963c8742f85SBenjamin Herrenschmidt /* Export symbol map to userspace */ 964c8742f85SBenjamin Herrenschmidt opal_export_symmap(); 965b09c2ec4SVasant Hegde /* Setup dump region interface */ 966b09c2ec4SVasant Hegde opal_dump_region_init(); 967774fea1aSStewart Smith /* Setup error log interface */ 968774fea1aSStewart Smith rc = opal_elog_init(); 96950bd6153SVasant Hegde /* Setup code update interface */ 970ed59190eSCyril Bur opal_flash_update_init(); 971c7e64b9cSStewart Smith /* Setup platform dump extract interface */ 972c7e64b9cSStewart Smith opal_platform_dump_init(); 9734029cd66SNeelesh Gupta /* Setup system parameters interface */ 9744029cd66SNeelesh Gupta opal_sys_param_init(); 9759b4fffa1SAndrew Donnellan /* Setup message log sysfs interface. */ 9769b4fffa1SAndrew Donnellan opal_msglog_sysfs_init(); 97750bd6153SVasant Hegde } 9786f68b5e2SVasant Hegde 97911fe909dSMatt Brown /* Export all properties */ 98011fe909dSMatt Brown opal_export_attrs(); 98111fe909dSMatt Brown 9820d7cd855SJeremy Kerr /* Initialize platform devices: IPMI backend, PRD & flash interface */ 9839e4f51bdSJack Miller opal_pdev_init("ibm,opal-ipmi"); 9849e4f51bdSJack Miller opal_pdev_init("ibm,opal-flash"); 9859e4f51bdSJack Miller opal_pdev_init("ibm,opal-prd"); 986ed59190eSCyril Bur 98743a1dd9bSSuraj Jitindar Singh /* Initialise platform device: oppanel interface */ 9889e4f51bdSJack Miller opal_pdev_init("ibm,opal-oppanel"); 98943a1dd9bSSuraj Jitindar Singh 990affddff6SRussell Currey /* Initialise OPAL kmsg dumper for flushing console on panic */ 991affddff6SRussell Currey opal_kmsg_init(); 992affddff6SRussell Currey 993cb8b340dSShilpasri G Bhat /* Initialise OPAL powercap interface */ 994cb8b340dSShilpasri G Bhat opal_powercap_init(); 995cb8b340dSShilpasri G Bhat 9968e84b2d1SShilpasri G Bhat /* Initialise OPAL Power-Shifting-Ratio interface */ 9978e84b2d1SShilpasri G Bhat opal_psr_init(); 9988e84b2d1SShilpasri G Bhat 999bf957155SShilpasri G Bhat /* Initialise OPAL sensor groups */ 1000bf957155SShilpasri G Bhat opal_sensor_groups_init(); 1001bf957155SShilpasri G Bhat 100208fb726dSMahesh Salgaonkar /* Initialise OPAL Power control interface */ 100308fb726dSMahesh Salgaonkar opal_power_control_init(); 100408fb726dSMahesh Salgaonkar 100514a43e69SBenjamin Herrenschmidt return 0; 100614a43e69SBenjamin Herrenschmidt } 1007b14726c5SMichael Ellerman machine_subsys_initcall(powernv, opal_init); 100873ed148aSBenjamin Herrenschmidt 100973ed148aSBenjamin Herrenschmidt void opal_shutdown(void) 101073ed148aSBenjamin Herrenschmidt { 1011f7d98d18SVasant Hegde long rc = OPAL_BUSY; 101273ed148aSBenjamin Herrenschmidt 10139f0fd049SAlistair Popple opal_event_shutdown(); 1014f7d98d18SVasant Hegde 1015f7d98d18SVasant Hegde /* 1016f7d98d18SVasant Hegde * Then sync with OPAL which ensure anything that can 1017f7d98d18SVasant Hegde * potentially write to our memory has completed such 1018f7d98d18SVasant Hegde * as an ongoing dump retrieval 1019f7d98d18SVasant Hegde */ 1020f7d98d18SVasant Hegde while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 1021f7d98d18SVasant Hegde rc = opal_sync_host_reboot(); 1022f7d98d18SVasant Hegde if (rc == OPAL_BUSY) 1023f7d98d18SVasant Hegde opal_poll_events(NULL); 1024f7d98d18SVasant Hegde else 1025f7d98d18SVasant Hegde mdelay(10); 1026f7d98d18SVasant Hegde } 1027b09c2ec4SVasant Hegde 1028b09c2ec4SVasant Hegde /* Unregister memory dump region */ 1029b962f5a4SStewart Smith if (opal_check_token(OPAL_UNREGISTER_DUMP_REGION)) 1030b09c2ec4SVasant Hegde opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF); 103173ed148aSBenjamin Herrenschmidt } 1032e28b05e7SJoel Stanley 1033e28b05e7SJoel Stanley /* Export this so that test modules can use it */ 1034e28b05e7SJoel Stanley EXPORT_SYMBOL_GPL(opal_invalid_call); 1035594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_read); 1036594fcb9eSJeremy Kerr EXPORT_SYMBOL_GPL(opal_xscom_write); 1037608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_send); 1038608b286dSJeremy Kerr EXPORT_SYMBOL_GPL(opal_ipmi_recv); 1039ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_read); 1040ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_write); 1041ed59190eSCyril Bur EXPORT_SYMBOL_GPL(opal_flash_erase); 10420d7cd855SJeremy Kerr EXPORT_SYMBOL_GPL(opal_prd_msg); 10436e708000SHaren Myneni EXPORT_SYMBOL_GPL(opal_check_token); 10443441f04bSAnton Blanchard 10453441f04bSAnton Blanchard /* Convert a region of vmalloc memory to an opal sg list */ 10463441f04bSAnton Blanchard struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr, 10473441f04bSAnton Blanchard unsigned long vmalloc_size) 10483441f04bSAnton Blanchard { 10493441f04bSAnton Blanchard struct opal_sg_list *sg, *first = NULL; 10503441f04bSAnton Blanchard unsigned long i = 0; 10513441f04bSAnton Blanchard 10523441f04bSAnton Blanchard sg = kzalloc(PAGE_SIZE, GFP_KERNEL); 10533441f04bSAnton Blanchard if (!sg) 10543441f04bSAnton Blanchard goto nomem; 10553441f04bSAnton Blanchard 10563441f04bSAnton Blanchard first = sg; 10573441f04bSAnton Blanchard 10583441f04bSAnton Blanchard while (vmalloc_size > 0) { 10593441f04bSAnton Blanchard uint64_t data = vmalloc_to_pfn(vmalloc_addr) << PAGE_SHIFT; 10603441f04bSAnton Blanchard uint64_t length = min(vmalloc_size, PAGE_SIZE); 10613441f04bSAnton Blanchard 10623441f04bSAnton Blanchard sg->entry[i].data = cpu_to_be64(data); 10633441f04bSAnton Blanchard sg->entry[i].length = cpu_to_be64(length); 10643441f04bSAnton Blanchard i++; 10653441f04bSAnton Blanchard 10663441f04bSAnton Blanchard if (i >= SG_ENTRIES_PER_NODE) { 10673441f04bSAnton Blanchard struct opal_sg_list *next; 10683441f04bSAnton Blanchard 10693441f04bSAnton Blanchard next = kzalloc(PAGE_SIZE, GFP_KERNEL); 10703441f04bSAnton Blanchard if (!next) 10713441f04bSAnton Blanchard goto nomem; 10723441f04bSAnton Blanchard 10733441f04bSAnton Blanchard sg->length = cpu_to_be64( 10743441f04bSAnton Blanchard i * sizeof(struct opal_sg_entry) + 16); 10753441f04bSAnton Blanchard i = 0; 10763441f04bSAnton Blanchard sg->next = cpu_to_be64(__pa(next)); 10773441f04bSAnton Blanchard sg = next; 10783441f04bSAnton Blanchard } 10793441f04bSAnton Blanchard 10803441f04bSAnton Blanchard vmalloc_addr += length; 10813441f04bSAnton Blanchard vmalloc_size -= length; 10823441f04bSAnton Blanchard } 10833441f04bSAnton Blanchard 10843441f04bSAnton Blanchard sg->length = cpu_to_be64(i * sizeof(struct opal_sg_entry) + 16); 10853441f04bSAnton Blanchard 10863441f04bSAnton Blanchard return first; 10873441f04bSAnton Blanchard 10883441f04bSAnton Blanchard nomem: 10893441f04bSAnton Blanchard pr_err("%s : Failed to allocate memory\n", __func__); 10903441f04bSAnton Blanchard opal_free_sg_list(first); 10913441f04bSAnton Blanchard return NULL; 10923441f04bSAnton Blanchard } 10933441f04bSAnton Blanchard 10943441f04bSAnton Blanchard void opal_free_sg_list(struct opal_sg_list *sg) 10953441f04bSAnton Blanchard { 10963441f04bSAnton Blanchard while (sg) { 10973441f04bSAnton Blanchard uint64_t next = be64_to_cpu(sg->next); 10983441f04bSAnton Blanchard 10993441f04bSAnton Blanchard kfree(sg); 11003441f04bSAnton Blanchard 11013441f04bSAnton Blanchard if (next) 11023441f04bSAnton Blanchard sg = __va(next); 11033441f04bSAnton Blanchard else 11043441f04bSAnton Blanchard sg = NULL; 11053441f04bSAnton Blanchard } 11063441f04bSAnton Blanchard } 110716b1d26eSNeelesh Gupta 1108e3c5c2e0SCédric Le Goater int opal_error_code(int rc) 1109e3c5c2e0SCédric Le Goater { 1110e3c5c2e0SCédric Le Goater switch (rc) { 1111e3c5c2e0SCédric Le Goater case OPAL_SUCCESS: return 0; 1112e3c5c2e0SCédric Le Goater 1113e3c5c2e0SCédric Le Goater case OPAL_PARAMETER: return -EINVAL; 1114e3c5c2e0SCédric Le Goater case OPAL_ASYNC_COMPLETION: return -EINPROGRESS; 111577adbd22SCyril Bur case OPAL_BUSY: 1116e3c5c2e0SCédric Le Goater case OPAL_BUSY_EVENT: return -EBUSY; 1117e3c5c2e0SCédric Le Goater case OPAL_NO_MEM: return -ENOMEM; 111814aae78fSCédric Le Goater case OPAL_PERMISSION: return -EPERM; 1119e3c5c2e0SCédric Le Goater 1120e3c5c2e0SCédric Le Goater case OPAL_UNSUPPORTED: return -EIO; 1121e3c5c2e0SCédric Le Goater case OPAL_HARDWARE: return -EIO; 1122e3c5c2e0SCédric Le Goater case OPAL_INTERNAL_ERROR: return -EIO; 1123cb8b340dSShilpasri G Bhat case OPAL_TIMEOUT: return -ETIMEDOUT; 1124e3c5c2e0SCédric Le Goater default: 1125e3c5c2e0SCédric Le Goater pr_err("%s: unexpected OPAL error %d\n", __func__, rc); 1126e3c5c2e0SCédric Le Goater return -EIO; 1127e3c5c2e0SCédric Le Goater } 1128e3c5c2e0SCédric Le Goater } 1129e3c5c2e0SCédric Le Goater 11301d0761d2SAlistair Popple void powernv_set_nmmu_ptcr(unsigned long ptcr) 11311d0761d2SAlistair Popple { 11321d0761d2SAlistair Popple int rc; 11331d0761d2SAlistair Popple 11341d0761d2SAlistair Popple if (firmware_has_feature(FW_FEATURE_OPAL)) { 11351d0761d2SAlistair Popple rc = opal_nmmu_set_ptcr(-1UL, ptcr); 11361d0761d2SAlistair Popple if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED) 11371d0761d2SAlistair Popple pr_warn("%s: Unable to set nest mmu ptcr\n", __func__); 11381d0761d2SAlistair Popple } 11391d0761d2SAlistair Popple } 11401d0761d2SAlistair Popple 114116b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_poll_events); 114216b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_read); 114316b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_rtc_write); 114416b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_read); 114516b1d26eSNeelesh Gupta EXPORT_SYMBOL_GPL(opal_tpo_write); 114647083450SNeelesh Gupta EXPORT_SYMBOL_GPL(opal_i2c_request); 1147c159b596SVasant Hegde /* Export these symbols for PowerNV LED class driver */ 1148c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_get_ind); 1149c159b596SVasant Hegde EXPORT_SYMBOL_GPL(opal_leds_set_ind); 115043a1dd9bSSuraj Jitindar Singh /* Export this symbol for PowerNV Operator Panel class driver */ 115143a1dd9bSSuraj Jitindar Singh EXPORT_SYMBOL_GPL(opal_write_oppanel_async); 1152ffe6d810SPaul Mackerras /* Export this for KVM */ 1153ffe6d810SPaul Mackerras EXPORT_SYMBOL_GPL(opal_int_set_mfrr); 11545af50993SBenjamin Herrenschmidt EXPORT_SYMBOL_GPL(opal_int_eoi); 115577adbd22SCyril Bur EXPORT_SYMBOL_GPL(opal_error_code); 1156656ecc16SHaren Myneni /* Export the below symbol for NX compression */ 1157656ecc16SHaren Myneni EXPORT_SYMBOL(opal_nx_coproc_init); 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