12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 255190f88SBenjamin Herrenschmidt /* 355190f88SBenjamin Herrenschmidt * PowerNV setup code. 455190f88SBenjamin Herrenschmidt * 555190f88SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 655190f88SBenjamin Herrenschmidt */ 755190f88SBenjamin Herrenschmidt 855190f88SBenjamin Herrenschmidt #undef DEBUG 955190f88SBenjamin Herrenschmidt 1055190f88SBenjamin Herrenschmidt #include <linux/cpu.h> 1155190f88SBenjamin Herrenschmidt #include <linux/errno.h> 1255190f88SBenjamin Herrenschmidt #include <linux/sched.h> 1355190f88SBenjamin Herrenschmidt #include <linux/kernel.h> 1455190f88SBenjamin Herrenschmidt #include <linux/tty.h> 1555190f88SBenjamin Herrenschmidt #include <linux/reboot.h> 1655190f88SBenjamin Herrenschmidt #include <linux/init.h> 1755190f88SBenjamin Herrenschmidt #include <linux/console.h> 1855190f88SBenjamin Herrenschmidt #include <linux/delay.h> 1955190f88SBenjamin Herrenschmidt #include <linux/irq.h> 2055190f88SBenjamin Herrenschmidt #include <linux/seq_file.h> 2155190f88SBenjamin Herrenschmidt #include <linux/of.h> 2226a2056eSRob Herring #include <linux/of_fdt.h> 2355190f88SBenjamin Herrenschmidt #include <linux/interrupt.h> 2455190f88SBenjamin Herrenschmidt #include <linux/bug.h> 25cd15b048SBenjamin Herrenschmidt #include <linux/pci.h> 26fb5153d0SGautham R. Shenoy #include <linux/cpufreq.h> 277290f3b3SNicholas Piggin #include <linux/memblock.h> 2855190f88SBenjamin Herrenschmidt 2955190f88SBenjamin Herrenschmidt #include <asm/machdep.h> 3055190f88SBenjamin Herrenschmidt #include <asm/firmware.h> 3155190f88SBenjamin Herrenschmidt #include <asm/xics.h> 32243e2511SBenjamin Herrenschmidt #include <asm/xive.h> 33daea1175SBenjamin Herrenschmidt #include <asm/opal.h> 3413906db6SBenjamin Herrenschmidt #include <asm/kexec.h> 35b2a80878SShreyas B. Prabhu #include <asm/smp.h> 3654820530SMichael Ellerman #include <asm/tm.h> 376e032b35SOliver O'Halloran #include <asm/setup.h> 3877addf6eSMichael Ellerman #include <asm/security_features.h> 3955190f88SBenjamin Herrenschmidt 4055190f88SBenjamin Herrenschmidt #include "powernv.h" 4155190f88SBenjamin Herrenschmidt 4277addf6eSMichael Ellerman 43e5913db1SNick Child static bool __init fw_feature_is(const char *state, const char *name, 4477addf6eSMichael Ellerman struct device_node *fw_features) 4577addf6eSMichael Ellerman { 4677addf6eSMichael Ellerman struct device_node *np; 4777addf6eSMichael Ellerman bool rc = false; 4877addf6eSMichael Ellerman 4977addf6eSMichael Ellerman np = of_get_child_by_name(fw_features, name); 5077addf6eSMichael Ellerman if (np) { 5177addf6eSMichael Ellerman rc = of_property_read_bool(np, state); 5277addf6eSMichael Ellerman of_node_put(np); 5377addf6eSMichael Ellerman } 5477addf6eSMichael Ellerman 5577addf6eSMichael Ellerman return rc; 5677addf6eSMichael Ellerman } 5777addf6eSMichael Ellerman 58e5913db1SNick Child static void __init init_fw_feat_flags(struct device_node *np) 5977addf6eSMichael Ellerman { 6077addf6eSMichael Ellerman if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np)) 6177addf6eSMichael Ellerman security_ftr_set(SEC_FTR_SPEC_BAR_ORI31); 6277addf6eSMichael Ellerman 6377addf6eSMichael Ellerman if (fw_feature_is("enabled", "fw-bcctrl-serialized", np)) 6477addf6eSMichael Ellerman security_ftr_set(SEC_FTR_BCCTRL_SERIALISED); 6577addf6eSMichael Ellerman 6637c0bdd0SMichael Ellerman if (fw_feature_is("enabled", "inst-l1d-flush-ori30,30,0", np)) 6777addf6eSMichael Ellerman security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30); 6877addf6eSMichael Ellerman 6977addf6eSMichael Ellerman if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np)) 7077addf6eSMichael Ellerman security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2); 7177addf6eSMichael Ellerman 7277addf6eSMichael Ellerman if (fw_feature_is("enabled", "fw-l1d-thread-split", np)) 7377addf6eSMichael Ellerman security_ftr_set(SEC_FTR_L1D_THREAD_PRIV); 7477addf6eSMichael Ellerman 7577addf6eSMichael Ellerman if (fw_feature_is("enabled", "fw-count-cache-disabled", np)) 7677addf6eSMichael Ellerman security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED); 7777addf6eSMichael Ellerman 7899d54754SMichael Ellerman if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np)) 7999d54754SMichael Ellerman security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST); 8099d54754SMichael Ellerman 8199d54754SMichael Ellerman if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np)) 8299d54754SMichael Ellerman security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE); 8399d54754SMichael Ellerman 8477addf6eSMichael Ellerman /* 8577addf6eSMichael Ellerman * The features below are enabled by default, so we instead look to see 8677addf6eSMichael Ellerman * if firmware has *disabled* them, and clear them if so. 8777addf6eSMichael Ellerman */ 8877addf6eSMichael Ellerman if (fw_feature_is("disabled", "speculation-policy-favor-security", np)) 8977addf6eSMichael Ellerman security_ftr_clear(SEC_FTR_FAVOUR_SECURITY); 9077addf6eSMichael Ellerman 9177addf6eSMichael Ellerman if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np)) 9277addf6eSMichael Ellerman security_ftr_clear(SEC_FTR_L1D_FLUSH_PR); 9377addf6eSMichael Ellerman 9477addf6eSMichael Ellerman if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np)) 9577addf6eSMichael Ellerman security_ftr_clear(SEC_FTR_L1D_FLUSH_HV); 9677addf6eSMichael Ellerman 9777addf6eSMichael Ellerman if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np)) 9877addf6eSMichael Ellerman security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR); 992efee6adSRussell Currey 1002efee6adSRussell Currey if (fw_feature_is("enabled", "no-need-l1d-flush-msr-pr-1-to-0", np)) 1012efee6adSRussell Currey security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY); 1022efee6adSRussell Currey 1032efee6adSRussell Currey if (fw_feature_is("enabled", "no-need-l1d-flush-kernel-on-user-access", np)) 1042efee6adSRussell Currey security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS); 105d2a3c131SRussell Currey 106d2a3c131SRussell Currey if (fw_feature_is("enabled", "no-need-store-drain-on-priv-state-switch", np)) 107d2a3c131SRussell Currey security_ftr_clear(SEC_FTR_STF_BARRIER); 10877addf6eSMichael Ellerman } 10977addf6eSMichael Ellerman 110e5913db1SNick Child static void __init pnv_setup_security_mitigations(void) 1116e032b35SOliver O'Halloran { 1126e032b35SOliver O'Halloran struct device_node *np, *fw_features; 1136e032b35SOliver O'Halloran enum l1d_flush_type type; 11437c0bdd0SMichael Ellerman bool enable; 1156e032b35SOliver O'Halloran 1166e032b35SOliver O'Halloran /* Default to fallback in case fw-features are not available */ 1176e032b35SOliver O'Halloran type = L1D_FLUSH_FALLBACK; 1186e032b35SOliver O'Halloran 1196e032b35SOliver O'Halloran np = of_find_node_by_name(NULL, "ibm,opal"); 1206e032b35SOliver O'Halloran fw_features = of_get_child_by_name(np, "fw-features"); 1216e032b35SOliver O'Halloran of_node_put(np); 1226e032b35SOliver O'Halloran 1236e032b35SOliver O'Halloran if (fw_features) { 12477addf6eSMichael Ellerman init_fw_feat_flags(fw_features); 12537c0bdd0SMichael Ellerman of_node_put(fw_features); 12677addf6eSMichael Ellerman 12737c0bdd0SMichael Ellerman if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2)) 1286e032b35SOliver O'Halloran type = L1D_FLUSH_MTTRIG; 1296e032b35SOliver O'Halloran 13037c0bdd0SMichael Ellerman if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30)) 1316e032b35SOliver O'Halloran type = L1D_FLUSH_ORI; 1326e032b35SOliver O'Halloran } 1336e032b35SOliver O'Halloran 134f7964378SNicholas Piggin /* 135d02fa40dSNicholas Piggin * The issues addressed by the entry and uaccess flush don't affect P7 136d02fa40dSNicholas Piggin * or P8, so on bare metal disable them explicitly in case firmware does 137d02fa40dSNicholas Piggin * not include the features to disable them. POWER9 and newer processors 138d02fa40dSNicholas Piggin * should have the appropriate firmware flags. 139f7964378SNicholas Piggin */ 140d02fa40dSNicholas Piggin if (pvr_version_is(PVR_POWER7) || pvr_version_is(PVR_POWER7p) || 141d02fa40dSNicholas Piggin pvr_version_is(PVR_POWER8E) || pvr_version_is(PVR_POWER8NVL) || 142d02fa40dSNicholas Piggin pvr_version_is(PVR_POWER8)) { 143f7964378SNicholas Piggin security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY); 1449a32a7e7SNicholas Piggin security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS); 1459a32a7e7SNicholas Piggin } 146f7964378SNicholas Piggin 14737c0bdd0SMichael Ellerman enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \ 14837c0bdd0SMichael Ellerman (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \ 14937c0bdd0SMichael Ellerman security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV)); 15037c0bdd0SMichael Ellerman 15137c0bdd0SMichael Ellerman setup_rfi_flush(type, enable); 15299d54754SMichael Ellerman setup_count_cache_flush(); 153f7964378SNicholas Piggin 154f7964378SNicholas Piggin enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && 155f7964378SNicholas Piggin security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY); 156f7964378SNicholas Piggin setup_entry_flush(enable); 1579a32a7e7SNicholas Piggin 1589a32a7e7SNicholas Piggin enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && 1599a32a7e7SNicholas Piggin security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS); 1609a32a7e7SNicholas Piggin setup_uaccess_flush(enable); 161da631f7fSDaniel Axtens 162da631f7fSDaniel Axtens setup_stf_barrier(); 1636e032b35SOliver O'Halloran } 1646e032b35SOliver O'Halloran 1658f55984fSJoel Stanley static void __init pnv_check_guarded_cores(void) 1668f55984fSJoel Stanley { 1678f55984fSJoel Stanley struct device_node *dn; 1688f55984fSJoel Stanley int bad_count = 0; 1698f55984fSJoel Stanley 1708f55984fSJoel Stanley for_each_node_by_type(dn, "cpu") { 1718f55984fSJoel Stanley if (of_property_match_string(dn, "status", "bad") >= 0) 1728f55984fSJoel Stanley bad_count++; 173caea7b83SYang Li } 1748f55984fSJoel Stanley 1758f55984fSJoel Stanley if (bad_count) { 1768f55984fSJoel Stanley printk(" _ _______________\n"); 1778f55984fSJoel Stanley pr_cont(" | | / \\\n"); 1788f55984fSJoel Stanley pr_cont(" | | | WARNING! |\n"); 1798f55984fSJoel Stanley pr_cont(" | | | |\n"); 1808f55984fSJoel Stanley pr_cont(" | | | It looks like |\n"); 1818f55984fSJoel Stanley pr_cont(" |_| | you have %*d |\n", 3, bad_count); 1828f55984fSJoel Stanley pr_cont(" _ | guarded cores |\n"); 1838f55984fSJoel Stanley pr_cont(" (_) \\_______________/\n"); 1848f55984fSJoel Stanley } 1858f55984fSJoel Stanley } 1868f55984fSJoel Stanley 18755190f88SBenjamin Herrenschmidt static void __init pnv_setup_arch(void) 18855190f88SBenjamin Herrenschmidt { 1894817fc32SAnton Blanchard set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 1904817fc32SAnton Blanchard 191da631f7fSDaniel Axtens pnv_setup_security_mitigations(); 1926e032b35SOliver O'Halloran 19355190f88SBenjamin Herrenschmidt /* Initialize SMP */ 19455190f88SBenjamin Herrenschmidt pnv_smp_init(); 19555190f88SBenjamin Herrenschmidt 196628daa8dSBenjamin Herrenschmidt /* Setup RTC and NVRAM callbacks */ 197628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 198628daa8dSBenjamin Herrenschmidt opal_nvram_init(); 19955190f88SBenjamin Herrenschmidt 20055190f88SBenjamin Herrenschmidt /* Enable NAP mode */ 20155190f88SBenjamin Herrenschmidt powersave_nap = 1; 20255190f88SBenjamin Herrenschmidt 2038f55984fSJoel Stanley pnv_check_guarded_cores(); 2048f55984fSJoel Stanley 20555190f88SBenjamin Herrenschmidt /* XXX PMCS */ 206*f3eac426SJason A. Donenfeld 207*f3eac426SJason A. Donenfeld pnv_rng_init(); 20855190f88SBenjamin Herrenschmidt } 20955190f88SBenjamin Herrenschmidt 210f2d57694SBenjamin Herrenschmidt static void __init pnv_init(void) 21155190f88SBenjamin Herrenschmidt { 2123fafe9c2SBenjamin Herrenschmidt /* 2133fafe9c2SBenjamin Herrenschmidt * Initialize the LPC bus now so that legacy serial 2143fafe9c2SBenjamin Herrenschmidt * ports can be found on it 2153fafe9c2SBenjamin Herrenschmidt */ 2163fafe9c2SBenjamin Herrenschmidt opal_lpc_init(); 2173fafe9c2SBenjamin Herrenschmidt 218daea1175SBenjamin Herrenschmidt #ifdef CONFIG_HVC_OPAL 219daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 220daea1175SBenjamin Herrenschmidt hvc_opal_init_early(); 221daea1175SBenjamin Herrenschmidt else 222daea1175SBenjamin Herrenschmidt #endif 223daea1175SBenjamin Herrenschmidt add_preferred_console("hvc", 0, NULL); 2247290f3b3SNicholas Piggin 225387e220aSNicholas Piggin #ifdef CONFIG_PPC_64S_HASH_MMU 2267290f3b3SNicholas Piggin if (!radix_enabled()) { 227a1ee2811SNicholas Piggin size_t size = sizeof(struct slb_entry) * mmu_slb_size; 2287290f3b3SNicholas Piggin int i; 2297290f3b3SNicholas Piggin 2307290f3b3SNicholas Piggin /* Allocate per cpu area to save old slb contents during MCE */ 231a1ee2811SNicholas Piggin for_each_possible_cpu(i) { 232a1ee2811SNicholas Piggin paca_ptrs[i]->mce_faulty_slbs = 233a1ee2811SNicholas Piggin memblock_alloc_node(size, 234a1ee2811SNicholas Piggin __alignof__(struct slb_entry), 235a1ee2811SNicholas Piggin cpu_to_node(i)); 236a1ee2811SNicholas Piggin } 2377290f3b3SNicholas Piggin } 238387e220aSNicholas Piggin #endif 23955190f88SBenjamin Herrenschmidt } 24055190f88SBenjamin Herrenschmidt 24155190f88SBenjamin Herrenschmidt static void __init pnv_init_IRQ(void) 24255190f88SBenjamin Herrenschmidt { 243243e2511SBenjamin Herrenschmidt /* Try using a XIVE if available, otherwise use a XICS */ 244243e2511SBenjamin Herrenschmidt if (!xive_native_init()) 24555190f88SBenjamin Herrenschmidt xics_init(); 24655190f88SBenjamin Herrenschmidt 24755190f88SBenjamin Herrenschmidt WARN_ON(!ppc_md.get_irq); 24855190f88SBenjamin Herrenschmidt } 24955190f88SBenjamin Herrenschmidt 25055190f88SBenjamin Herrenschmidt static void pnv_show_cpuinfo(struct seq_file *m) 25155190f88SBenjamin Herrenschmidt { 25255190f88SBenjamin Herrenschmidt struct device_node *root; 25355190f88SBenjamin Herrenschmidt const char *model = ""; 25455190f88SBenjamin Herrenschmidt 25555190f88SBenjamin Herrenschmidt root = of_find_node_by_path("/"); 25655190f88SBenjamin Herrenschmidt if (root) 25755190f88SBenjamin Herrenschmidt model = of_get_property(root, "model", NULL); 25855190f88SBenjamin Herrenschmidt seq_printf(m, "machine\t\t: PowerNV %s\n", model); 259e4d54f71SStewart Smith if (firmware_has_feature(FW_FEATURE_OPAL)) 260e4d54f71SStewart Smith seq_printf(m, "firmware\t: OPAL\n"); 26114a43e69SBenjamin Herrenschmidt else 26214a43e69SBenjamin Herrenschmidt seq_printf(m, "firmware\t: BML\n"); 26355190f88SBenjamin Herrenschmidt of_node_put(root); 2643a4c2601SAneesh Kumar K.V if (radix_enabled()) 2653a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Radix\n"); 2663a4c2601SAneesh Kumar K.V else 2673a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Hash\n"); 26855190f88SBenjamin Herrenschmidt } 26955190f88SBenjamin Herrenschmidt 2702196c6f1SVasant Hegde static void pnv_prepare_going_down(void) 2712196c6f1SVasant Hegde { 2722196c6f1SVasant Hegde /* 2732196c6f1SVasant Hegde * Disable all notifiers from OPAL, we can't 2742196c6f1SVasant Hegde * service interrupts anymore anyway 2752196c6f1SVasant Hegde */ 27681f2f7ceSAlistair Popple opal_event_shutdown(); 2772196c6f1SVasant Hegde 278f2748bdfSNicholas Piggin /* Print flash update message if one is scheduled. */ 279f2748bdfSNicholas Piggin opal_flash_update_print_message(); 2802196c6f1SVasant Hegde 281f2748bdfSNicholas Piggin smp_send_stop(); 282f2748bdfSNicholas Piggin 283f2748bdfSNicholas Piggin hard_irq_disable(); 2842196c6f1SVasant Hegde } 2852196c6f1SVasant Hegde 286ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_restart(char *cmd) 28755190f88SBenjamin Herrenschmidt { 2888139046aSVaibhav Jain long rc; 289ec27329fSBenjamin Herrenschmidt 2902196c6f1SVasant Hegde pnv_prepare_going_down(); 291e8e71fa4SGavin Shan 2928139046aSVaibhav Jain do { 29316985f2dSOliver O'Halloran if (!cmd || !strlen(cmd)) 294ec27329fSBenjamin Herrenschmidt rc = opal_cec_reboot(); 2958139046aSVaibhav Jain else if (strcmp(cmd, "full") == 0) 2968139046aSVaibhav Jain rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL); 29737f6f8e8SOliver O'Halloran else if (strcmp(cmd, "mpipl") == 0) 29837f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL); 29937f6f8e8SOliver O'Halloran else if (strcmp(cmd, "error") == 0) 30037f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL); 301672e480aSOliver O'Halloran else if (strcmp(cmd, "fast") == 0) 302672e480aSOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL); 303ec27329fSBenjamin Herrenschmidt else 3048139046aSVaibhav Jain rc = OPAL_UNSUPPORTED; 3058139046aSVaibhav Jain 3068139046aSVaibhav Jain if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 3078139046aSVaibhav Jain /* Opal is busy wait for some time and retry */ 3088139046aSVaibhav Jain opal_poll_events(NULL); 309ec27329fSBenjamin Herrenschmidt mdelay(10); 3108139046aSVaibhav Jain 3118139046aSVaibhav Jain } else if (cmd && rc) { 3128139046aSVaibhav Jain /* Unknown error while issuing reboot */ 3138139046aSVaibhav Jain if (rc == OPAL_UNSUPPORTED) 3148139046aSVaibhav Jain pr_err("Unsupported '%s' reboot.\n", cmd); 3158139046aSVaibhav Jain else 3168139046aSVaibhav Jain pr_err("Unable to issue '%s' reboot. Err=%ld\n", 3178139046aSVaibhav Jain cmd, rc); 3188139046aSVaibhav Jain pr_info("Forcing a cec-reboot\n"); 3198139046aSVaibhav Jain cmd = NULL; 3208139046aSVaibhav Jain rc = OPAL_BUSY; 3218139046aSVaibhav Jain 3228139046aSVaibhav Jain } else if (rc != OPAL_SUCCESS) { 3238139046aSVaibhav Jain /* Unknown error while issuing cec-reboot */ 3248139046aSVaibhav Jain pr_err("Unable to reboot. Err=%ld\n", rc); 325ec27329fSBenjamin Herrenschmidt } 3268139046aSVaibhav Jain 3278139046aSVaibhav Jain } while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT); 3288139046aSVaibhav Jain 329ec27329fSBenjamin Herrenschmidt for (;;) 330ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 33155190f88SBenjamin Herrenschmidt } 33255190f88SBenjamin Herrenschmidt 333ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_power_off(void) 33455190f88SBenjamin Herrenschmidt { 335ec27329fSBenjamin Herrenschmidt long rc = OPAL_BUSY; 336ec27329fSBenjamin Herrenschmidt 3372196c6f1SVasant Hegde pnv_prepare_going_down(); 338e8e71fa4SGavin Shan 339ec27329fSBenjamin Herrenschmidt while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 340ec27329fSBenjamin Herrenschmidt rc = opal_cec_power_down(0); 341ec27329fSBenjamin Herrenschmidt if (rc == OPAL_BUSY_EVENT) 342ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 343ec27329fSBenjamin Herrenschmidt else 344ec27329fSBenjamin Herrenschmidt mdelay(10); 345ec27329fSBenjamin Herrenschmidt } 346ec27329fSBenjamin Herrenschmidt for (;;) 347ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 34855190f88SBenjamin Herrenschmidt } 34955190f88SBenjamin Herrenschmidt 350ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_halt(void) 35155190f88SBenjamin Herrenschmidt { 352ec27329fSBenjamin Herrenschmidt pnv_power_off(); 35355190f88SBenjamin Herrenschmidt } 35455190f88SBenjamin Herrenschmidt 35555190f88SBenjamin Herrenschmidt static void pnv_progress(char *s, unsigned short hex) 35655190f88SBenjamin Herrenschmidt { 35755190f88SBenjamin Herrenschmidt } 35855190f88SBenjamin Herrenschmidt 35973ed148aSBenjamin Herrenschmidt static void pnv_shutdown(void) 36073ed148aSBenjamin Herrenschmidt { 36173ed148aSBenjamin Herrenschmidt /* Let the PCI code clear up IODA tables */ 36273ed148aSBenjamin Herrenschmidt pnv_pci_shutdown(); 36373ed148aSBenjamin Herrenschmidt 364f7d98d18SVasant Hegde /* 365f7d98d18SVasant Hegde * Stop OPAL activity: Unregister all OPAL interrupts so they 366f7d98d18SVasant Hegde * don't fire up while we kexec and make sure all potentially 367f7d98d18SVasant Hegde * DMA'ing ops are complete (such as dump retrieval). 36873ed148aSBenjamin Herrenschmidt */ 36973ed148aSBenjamin Herrenschmidt opal_shutdown(); 37073ed148aSBenjamin Herrenschmidt } 37173ed148aSBenjamin Herrenschmidt 372da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 373298b34d7SBenjamin Herrenschmidt static void pnv_kexec_wait_secondaries_down(void) 374298b34d7SBenjamin Herrenschmidt { 375298b34d7SBenjamin Herrenschmidt int my_cpu, i, notified = -1; 376298b34d7SBenjamin Herrenschmidt 377298b34d7SBenjamin Herrenschmidt my_cpu = get_cpu(); 378298b34d7SBenjamin Herrenschmidt 379298b34d7SBenjamin Herrenschmidt for_each_online_cpu(i) { 380298b34d7SBenjamin Herrenschmidt uint8_t status; 3811b70386cSSamuel Mendoza-Jonas int64_t rc, timeout = 1000; 382298b34d7SBenjamin Herrenschmidt 383298b34d7SBenjamin Herrenschmidt if (i == my_cpu) 384298b34d7SBenjamin Herrenschmidt continue; 385298b34d7SBenjamin Herrenschmidt 386298b34d7SBenjamin Herrenschmidt for (;;) { 387298b34d7SBenjamin Herrenschmidt rc = opal_query_cpu_status(get_hard_smp_processor_id(i), 388298b34d7SBenjamin Herrenschmidt &status); 389298b34d7SBenjamin Herrenschmidt if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED) 390298b34d7SBenjamin Herrenschmidt break; 391298b34d7SBenjamin Herrenschmidt barrier(); 392298b34d7SBenjamin Herrenschmidt if (i != notified) { 393298b34d7SBenjamin Herrenschmidt printk(KERN_INFO "kexec: waiting for cpu %d " 394298b34d7SBenjamin Herrenschmidt "(physical %d) to enter OPAL\n", 395d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 396298b34d7SBenjamin Herrenschmidt notified = i; 397298b34d7SBenjamin Herrenschmidt } 3981b70386cSSamuel Mendoza-Jonas 3991b70386cSSamuel Mendoza-Jonas /* 4001b70386cSSamuel Mendoza-Jonas * On crash secondaries might be unreachable or hung, 4011b70386cSSamuel Mendoza-Jonas * so timeout if we've waited too long 4021b70386cSSamuel Mendoza-Jonas * */ 4031b70386cSSamuel Mendoza-Jonas mdelay(1); 4041b70386cSSamuel Mendoza-Jonas if (timeout-- == 0) { 4051b70386cSSamuel Mendoza-Jonas printk(KERN_ERR "kexec: timed out waiting for " 4061b70386cSSamuel Mendoza-Jonas "cpu %d (physical %d) to enter OPAL\n", 407d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 4081b70386cSSamuel Mendoza-Jonas break; 4091b70386cSSamuel Mendoza-Jonas } 410298b34d7SBenjamin Herrenschmidt } 411298b34d7SBenjamin Herrenschmidt } 412298b34d7SBenjamin Herrenschmidt } 413298b34d7SBenjamin Herrenschmidt 41455190f88SBenjamin Herrenschmidt static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 41555190f88SBenjamin Herrenschmidt { 4161c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags; 4171c0eaf0fSBenjamin Herrenschmidt 418243e2511SBenjamin Herrenschmidt if (xive_enabled()) 419e27e0a94SBenjamin Herrenschmidt xive_teardown_cpu(); 420243e2511SBenjamin Herrenschmidt else 42155190f88SBenjamin Herrenschmidt xics_kexec_teardown_cpu(secondary); 42213906db6SBenjamin Herrenschmidt 423e4d54f71SStewart Smith /* On OPAL, we return all CPUs to firmware */ 424e4d54f71SStewart Smith if (!firmware_has_feature(FW_FEATURE_OPAL)) 425298b34d7SBenjamin Herrenschmidt return; 426298b34d7SBenjamin Herrenschmidt 427298b34d7SBenjamin Herrenschmidt if (secondary) { 42813906db6SBenjamin Herrenschmidt /* Return secondary CPUs to firmware on OPAL v3 */ 42913906db6SBenjamin Herrenschmidt mb(); 43013906db6SBenjamin Herrenschmidt get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 43113906db6SBenjamin Herrenschmidt mb(); 43213906db6SBenjamin Herrenschmidt 43313906db6SBenjamin Herrenschmidt /* Return the CPU to OPAL */ 43413906db6SBenjamin Herrenschmidt opal_return_cpu(); 435298b34d7SBenjamin Herrenschmidt } else { 436298b34d7SBenjamin Herrenschmidt /* Primary waits for the secondaries to have reached OPAL */ 437298b34d7SBenjamin Herrenschmidt pnv_kexec_wait_secondaries_down(); 438e72bb8a5SSamuel Mendoza-Jonas 439243e2511SBenjamin Herrenschmidt /* Switch XIVE back to emulation mode */ 440243e2511SBenjamin Herrenschmidt if (xive_enabled()) 441243e2511SBenjamin Herrenschmidt xive_shutdown(); 442243e2511SBenjamin Herrenschmidt 443e72bb8a5SSamuel Mendoza-Jonas /* 444e72bb8a5SSamuel Mendoza-Jonas * We might be running as little-endian - now that interrupts 445e72bb8a5SSamuel Mendoza-Jonas * are disabled, reset the HILE bit to big-endian so we don't 446e72bb8a5SSamuel Mendoza-Jonas * take interrupts in the wrong endian later 4471c0eaf0fSBenjamin Herrenschmidt * 4481c0eaf0fSBenjamin Herrenschmidt * We reinit to enable both radix and hash on P9 to ensure 4491c0eaf0fSBenjamin Herrenschmidt * the mode used by the next kernel is always supported. 450e72bb8a5SSamuel Mendoza-Jonas */ 4511c0eaf0fSBenjamin Herrenschmidt reinit_flags = OPAL_REINIT_CPUS_HILE_BE; 4521c0eaf0fSBenjamin Herrenschmidt if (cpu_has_feature(CPU_FTR_ARCH_300)) 4531c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX | 4541c0eaf0fSBenjamin Herrenschmidt OPAL_REINIT_CPUS_MMU_HASH; 4551c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 45613906db6SBenjamin Herrenschmidt } 45755190f88SBenjamin Herrenschmidt } 458da665885SThiago Jung Bauermann #endif /* CONFIG_KEXEC_CORE */ 45955190f88SBenjamin Herrenschmidt 46050f9481eSDavid Hildenbrand #ifdef CONFIG_MEMORY_HOTPLUG 4616d97d7a2SAnton Blanchard static unsigned long pnv_memory_block_size(void) 4626d97d7a2SAnton Blanchard { 463af9d00e9SAneesh Kumar K.V /* 464af9d00e9SAneesh Kumar K.V * We map the kernel linear region with 1GB large pages on radix. For 465af9d00e9SAneesh Kumar K.V * memory hot unplug to work our memory block size must be at least 466af9d00e9SAneesh Kumar K.V * this size. 467af9d00e9SAneesh Kumar K.V */ 468af9d00e9SAneesh Kumar K.V if (radix_enabled()) 469af9d00e9SAneesh Kumar K.V return radix_mem_block_size; 470af9d00e9SAneesh Kumar K.V else 4716d97d7a2SAnton Blanchard return 256UL * 1024 * 1024; 4726d97d7a2SAnton Blanchard } 4736d97d7a2SAnton Blanchard #endif 4746d97d7a2SAnton Blanchard 475628daa8dSBenjamin Herrenschmidt static void __init pnv_setup_machdep_opal(void) 476628daa8dSBenjamin Herrenschmidt { 477628daa8dSBenjamin Herrenschmidt ppc_md.get_boot_time = opal_get_boot_time; 478628daa8dSBenjamin Herrenschmidt ppc_md.restart = pnv_restart; 4799178ba29SAlexander Graf pm_power_off = pnv_power_off; 480628daa8dSBenjamin Herrenschmidt ppc_md.halt = pnv_halt; 481e36d0a2eSNicholas Piggin /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */ 482ed79ba9eSBenjamin Herrenschmidt ppc_md.machine_check_exception = opal_machine_check; 48355672ecfSMahesh Salgaonkar ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; 484de269129SMahesh Salgaonkar if (opal_check_token(OPAL_HANDLE_HMI2)) 485de269129SMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early2; 486de269129SMahesh Salgaonkar else 4870869b6fdSMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early; 4880869b6fdSMahesh Salgaonkar ppc_md.handle_hmi_exception = opal_handle_hmi_exception; 489628daa8dSBenjamin Herrenschmidt } 490628daa8dSBenjamin Herrenschmidt 49155190f88SBenjamin Herrenschmidt static int __init pnv_probe(void) 49255190f88SBenjamin Herrenschmidt { 493406b0b6aSBenjamin Herrenschmidt if (!of_machine_is_compatible("ibm,powernv")) 49455190f88SBenjamin Herrenschmidt return 0; 49555190f88SBenjamin Herrenschmidt 496628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 497628daa8dSBenjamin Herrenschmidt pnv_setup_machdep_opal(); 498628daa8dSBenjamin Herrenschmidt 49955190f88SBenjamin Herrenschmidt pr_debug("PowerNV detected !\n"); 50055190f88SBenjamin Herrenschmidt 501f2d57694SBenjamin Herrenschmidt pnv_init(); 502f2d57694SBenjamin Herrenschmidt 50355190f88SBenjamin Herrenschmidt return 1; 50455190f88SBenjamin Herrenschmidt } 50555190f88SBenjamin Herrenschmidt 50654820530SMichael Ellerman #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 50754820530SMichael Ellerman void __init pnv_tm_init(void) 50854820530SMichael Ellerman { 50954820530SMichael Ellerman if (!firmware_has_feature(FW_FEATURE_OPAL) || 51054820530SMichael Ellerman !pvr_version_is(PVR_POWER9) || 51154820530SMichael Ellerman early_cpu_has_feature(CPU_FTR_TM)) 51254820530SMichael Ellerman return; 51354820530SMichael Ellerman 51454820530SMichael Ellerman if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS) 51554820530SMichael Ellerman return; 51654820530SMichael Ellerman 51754820530SMichael Ellerman pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n"); 51854820530SMichael Ellerman cur_cpu_spec->cpu_features |= CPU_FTR_TM; 51954820530SMichael Ellerman /* Make sure "normal" HTM is off (it should be) */ 52054820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM; 52154820530SMichael Ellerman /* Turn on no suspend mode, and HTM no SC */ 52254820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \ 52354820530SMichael Ellerman PPC_FEATURE2_HTM_NOSC; 52454820530SMichael Ellerman tm_suspend_disabled = true; 52554820530SMichael Ellerman } 52654820530SMichael Ellerman #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 52754820530SMichael Ellerman 528fb5153d0SGautham R. Shenoy /* 529fb5153d0SGautham R. Shenoy * Returns the cpu frequency for 'cpu' in Hz. This is used by 530fb5153d0SGautham R. Shenoy * /proc/cpuinfo 531fb5153d0SGautham R. Shenoy */ 532e51df2c1SAnton Blanchard static unsigned long pnv_get_proc_freq(unsigned int cpu) 533fb5153d0SGautham R. Shenoy { 534fb5153d0SGautham R. Shenoy unsigned long ret_freq; 535fb5153d0SGautham R. Shenoy 536cd77b5ceSShriya ret_freq = cpufreq_get(cpu) * 1000ul; 537fb5153d0SGautham R. Shenoy 538fb5153d0SGautham R. Shenoy /* 539fb5153d0SGautham R. Shenoy * If the backend cpufreq driver does not exist, 540fb5153d0SGautham R. Shenoy * then fallback to old way of reporting the clockrate. 541fb5153d0SGautham R. Shenoy */ 542fb5153d0SGautham R. Shenoy if (!ret_freq) 543fb5153d0SGautham R. Shenoy ret_freq = ppc_proc_freq; 544fb5153d0SGautham R. Shenoy return ret_freq; 545fb5153d0SGautham R. Shenoy } 546fb5153d0SGautham R. Shenoy 547a43c1590SMahesh Salgaonkar static long pnv_machine_check_early(struct pt_regs *regs) 548a43c1590SMahesh Salgaonkar { 549a43c1590SMahesh Salgaonkar long handled = 0; 550a43c1590SMahesh Salgaonkar 551a43c1590SMahesh Salgaonkar if (cur_cpu_spec && cur_cpu_spec->machine_check_early) 552a43c1590SMahesh Salgaonkar handled = cur_cpu_spec->machine_check_early(regs); 553a43c1590SMahesh Salgaonkar 554a43c1590SMahesh Salgaonkar return handled; 555a43c1590SMahesh Salgaonkar } 556a43c1590SMahesh Salgaonkar 55755190f88SBenjamin Herrenschmidt define_machine(powernv) { 55855190f88SBenjamin Herrenschmidt .name = "PowerNV", 55955190f88SBenjamin Herrenschmidt .probe = pnv_probe, 560628daa8dSBenjamin Herrenschmidt .setup_arch = pnv_setup_arch, 56155190f88SBenjamin Herrenschmidt .init_IRQ = pnv_init_IRQ, 56255190f88SBenjamin Herrenschmidt .show_cpuinfo = pnv_show_cpuinfo, 563fb5153d0SGautham R. Shenoy .get_proc_freq = pnv_get_proc_freq, 564fbbefb32SOliver O'Halloran .discover_phbs = pnv_pci_init, 56555190f88SBenjamin Herrenschmidt .progress = pnv_progress, 56673ed148aSBenjamin Herrenschmidt .machine_shutdown = pnv_shutdown, 5675593e303SShreyas B. Prabhu .power_save = NULL, 56855190f88SBenjamin Herrenschmidt .calibrate_decr = generic_calibrate_decr, 569a43c1590SMahesh Salgaonkar .machine_check_early = pnv_machine_check_early, 570da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 57155190f88SBenjamin Herrenschmidt .kexec_cpu_down = pnv_kexec_cpu_down, 57255190f88SBenjamin Herrenschmidt #endif 57350f9481eSDavid Hildenbrand #ifdef CONFIG_MEMORY_HOTPLUG 5746d97d7a2SAnton Blanchard .memory_block_size = pnv_memory_block_size, 5756d97d7a2SAnton Blanchard #endif 57655190f88SBenjamin Herrenschmidt }; 577