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); 99*2efee6adSRussell Currey 100*2efee6adSRussell Currey if (fw_feature_is("enabled", "no-need-l1d-flush-msr-pr-1-to-0", np)) 101*2efee6adSRussell Currey security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY); 102*2efee6adSRussell Currey 103*2efee6adSRussell Currey if (fw_feature_is("enabled", "no-need-l1d-flush-kernel-on-user-access", np)) 104*2efee6adSRussell Currey security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS); 10577addf6eSMichael Ellerman } 10677addf6eSMichael Ellerman 107e5913db1SNick Child static void __init pnv_setup_security_mitigations(void) 1086e032b35SOliver O'Halloran { 1096e032b35SOliver O'Halloran struct device_node *np, *fw_features; 1106e032b35SOliver O'Halloran enum l1d_flush_type type; 11137c0bdd0SMichael Ellerman bool enable; 1126e032b35SOliver O'Halloran 1136e032b35SOliver O'Halloran /* Default to fallback in case fw-features are not available */ 1146e032b35SOliver O'Halloran type = L1D_FLUSH_FALLBACK; 1156e032b35SOliver O'Halloran 1166e032b35SOliver O'Halloran np = of_find_node_by_name(NULL, "ibm,opal"); 1176e032b35SOliver O'Halloran fw_features = of_get_child_by_name(np, "fw-features"); 1186e032b35SOliver O'Halloran of_node_put(np); 1196e032b35SOliver O'Halloran 1206e032b35SOliver O'Halloran if (fw_features) { 12177addf6eSMichael Ellerman init_fw_feat_flags(fw_features); 12237c0bdd0SMichael Ellerman of_node_put(fw_features); 12377addf6eSMichael Ellerman 12437c0bdd0SMichael Ellerman if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2)) 1256e032b35SOliver O'Halloran type = L1D_FLUSH_MTTRIG; 1266e032b35SOliver O'Halloran 12737c0bdd0SMichael Ellerman if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30)) 1286e032b35SOliver O'Halloran type = L1D_FLUSH_ORI; 1296e032b35SOliver O'Halloran } 1306e032b35SOliver O'Halloran 131f7964378SNicholas Piggin /* 132d02fa40dSNicholas Piggin * The issues addressed by the entry and uaccess flush don't affect P7 133d02fa40dSNicholas Piggin * or P8, so on bare metal disable them explicitly in case firmware does 134d02fa40dSNicholas Piggin * not include the features to disable them. POWER9 and newer processors 135d02fa40dSNicholas Piggin * should have the appropriate firmware flags. 136f7964378SNicholas Piggin */ 137d02fa40dSNicholas Piggin if (pvr_version_is(PVR_POWER7) || pvr_version_is(PVR_POWER7p) || 138d02fa40dSNicholas Piggin pvr_version_is(PVR_POWER8E) || pvr_version_is(PVR_POWER8NVL) || 139d02fa40dSNicholas Piggin pvr_version_is(PVR_POWER8)) { 140f7964378SNicholas Piggin security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY); 1419a32a7e7SNicholas Piggin security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS); 1429a32a7e7SNicholas Piggin } 143f7964378SNicholas Piggin 14437c0bdd0SMichael Ellerman enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \ 14537c0bdd0SMichael Ellerman (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \ 14637c0bdd0SMichael Ellerman security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV)); 14737c0bdd0SMichael Ellerman 14837c0bdd0SMichael Ellerman setup_rfi_flush(type, enable); 14999d54754SMichael Ellerman setup_count_cache_flush(); 150f7964378SNicholas Piggin 151f7964378SNicholas Piggin enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && 152f7964378SNicholas Piggin security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY); 153f7964378SNicholas Piggin setup_entry_flush(enable); 1549a32a7e7SNicholas Piggin 1559a32a7e7SNicholas Piggin enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && 1569a32a7e7SNicholas Piggin security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS); 1579a32a7e7SNicholas Piggin setup_uaccess_flush(enable); 158da631f7fSDaniel Axtens 159da631f7fSDaniel Axtens setup_stf_barrier(); 1606e032b35SOliver O'Halloran } 1616e032b35SOliver O'Halloran 1628f55984fSJoel Stanley static void __init pnv_check_guarded_cores(void) 1638f55984fSJoel Stanley { 1648f55984fSJoel Stanley struct device_node *dn; 1658f55984fSJoel Stanley int bad_count = 0; 1668f55984fSJoel Stanley 1678f55984fSJoel Stanley for_each_node_by_type(dn, "cpu") { 1688f55984fSJoel Stanley if (of_property_match_string(dn, "status", "bad") >= 0) 1698f55984fSJoel Stanley bad_count++; 170caea7b83SYang Li } 1718f55984fSJoel Stanley 1728f55984fSJoel Stanley if (bad_count) { 1738f55984fSJoel Stanley printk(" _ _______________\n"); 1748f55984fSJoel Stanley pr_cont(" | | / \\\n"); 1758f55984fSJoel Stanley pr_cont(" | | | WARNING! |\n"); 1768f55984fSJoel Stanley pr_cont(" | | | |\n"); 1778f55984fSJoel Stanley pr_cont(" | | | It looks like |\n"); 1788f55984fSJoel Stanley pr_cont(" |_| | you have %*d |\n", 3, bad_count); 1798f55984fSJoel Stanley pr_cont(" _ | guarded cores |\n"); 1808f55984fSJoel Stanley pr_cont(" (_) \\_______________/\n"); 1818f55984fSJoel Stanley } 1828f55984fSJoel Stanley } 1838f55984fSJoel Stanley 18455190f88SBenjamin Herrenschmidt static void __init pnv_setup_arch(void) 18555190f88SBenjamin Herrenschmidt { 1864817fc32SAnton Blanchard set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 1874817fc32SAnton Blanchard 188da631f7fSDaniel Axtens pnv_setup_security_mitigations(); 1896e032b35SOliver O'Halloran 19055190f88SBenjamin Herrenschmidt /* Initialize SMP */ 19155190f88SBenjamin Herrenschmidt pnv_smp_init(); 19255190f88SBenjamin Herrenschmidt 193628daa8dSBenjamin Herrenschmidt /* Setup RTC and NVRAM callbacks */ 194628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 195628daa8dSBenjamin Herrenschmidt opal_nvram_init(); 19655190f88SBenjamin Herrenschmidt 19755190f88SBenjamin Herrenschmidt /* Enable NAP mode */ 19855190f88SBenjamin Herrenschmidt powersave_nap = 1; 19955190f88SBenjamin Herrenschmidt 2008f55984fSJoel Stanley pnv_check_guarded_cores(); 2018f55984fSJoel Stanley 20255190f88SBenjamin Herrenschmidt /* XXX PMCS */ 20355190f88SBenjamin Herrenschmidt } 20455190f88SBenjamin Herrenschmidt 205f2d57694SBenjamin Herrenschmidt static void __init pnv_init(void) 20655190f88SBenjamin Herrenschmidt { 2073fafe9c2SBenjamin Herrenschmidt /* 2083fafe9c2SBenjamin Herrenschmidt * Initialize the LPC bus now so that legacy serial 2093fafe9c2SBenjamin Herrenschmidt * ports can be found on it 2103fafe9c2SBenjamin Herrenschmidt */ 2113fafe9c2SBenjamin Herrenschmidt opal_lpc_init(); 2123fafe9c2SBenjamin Herrenschmidt 213daea1175SBenjamin Herrenschmidt #ifdef CONFIG_HVC_OPAL 214daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 215daea1175SBenjamin Herrenschmidt hvc_opal_init_early(); 216daea1175SBenjamin Herrenschmidt else 217daea1175SBenjamin Herrenschmidt #endif 218daea1175SBenjamin Herrenschmidt add_preferred_console("hvc", 0, NULL); 2197290f3b3SNicholas Piggin 220387e220aSNicholas Piggin #ifdef CONFIG_PPC_64S_HASH_MMU 2217290f3b3SNicholas Piggin if (!radix_enabled()) { 222a1ee2811SNicholas Piggin size_t size = sizeof(struct slb_entry) * mmu_slb_size; 2237290f3b3SNicholas Piggin int i; 2247290f3b3SNicholas Piggin 2257290f3b3SNicholas Piggin /* Allocate per cpu area to save old slb contents during MCE */ 226a1ee2811SNicholas Piggin for_each_possible_cpu(i) { 227a1ee2811SNicholas Piggin paca_ptrs[i]->mce_faulty_slbs = 228a1ee2811SNicholas Piggin memblock_alloc_node(size, 229a1ee2811SNicholas Piggin __alignof__(struct slb_entry), 230a1ee2811SNicholas Piggin cpu_to_node(i)); 231a1ee2811SNicholas Piggin } 2327290f3b3SNicholas Piggin } 233387e220aSNicholas Piggin #endif 23455190f88SBenjamin Herrenschmidt } 23555190f88SBenjamin Herrenschmidt 23655190f88SBenjamin Herrenschmidt static void __init pnv_init_IRQ(void) 23755190f88SBenjamin Herrenschmidt { 238243e2511SBenjamin Herrenschmidt /* Try using a XIVE if available, otherwise use a XICS */ 239243e2511SBenjamin Herrenschmidt if (!xive_native_init()) 24055190f88SBenjamin Herrenschmidt xics_init(); 24155190f88SBenjamin Herrenschmidt 24255190f88SBenjamin Herrenschmidt WARN_ON(!ppc_md.get_irq); 24355190f88SBenjamin Herrenschmidt } 24455190f88SBenjamin Herrenschmidt 24555190f88SBenjamin Herrenschmidt static void pnv_show_cpuinfo(struct seq_file *m) 24655190f88SBenjamin Herrenschmidt { 24755190f88SBenjamin Herrenschmidt struct device_node *root; 24855190f88SBenjamin Herrenschmidt const char *model = ""; 24955190f88SBenjamin Herrenschmidt 25055190f88SBenjamin Herrenschmidt root = of_find_node_by_path("/"); 25155190f88SBenjamin Herrenschmidt if (root) 25255190f88SBenjamin Herrenschmidt model = of_get_property(root, "model", NULL); 25355190f88SBenjamin Herrenschmidt seq_printf(m, "machine\t\t: PowerNV %s\n", model); 254e4d54f71SStewart Smith if (firmware_has_feature(FW_FEATURE_OPAL)) 255e4d54f71SStewart Smith seq_printf(m, "firmware\t: OPAL\n"); 25614a43e69SBenjamin Herrenschmidt else 25714a43e69SBenjamin Herrenschmidt seq_printf(m, "firmware\t: BML\n"); 25855190f88SBenjamin Herrenschmidt of_node_put(root); 2593a4c2601SAneesh Kumar K.V if (radix_enabled()) 2603a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Radix\n"); 2613a4c2601SAneesh Kumar K.V else 2623a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Hash\n"); 26355190f88SBenjamin Herrenschmidt } 26455190f88SBenjamin Herrenschmidt 2652196c6f1SVasant Hegde static void pnv_prepare_going_down(void) 2662196c6f1SVasant Hegde { 2672196c6f1SVasant Hegde /* 2682196c6f1SVasant Hegde * Disable all notifiers from OPAL, we can't 2692196c6f1SVasant Hegde * service interrupts anymore anyway 2702196c6f1SVasant Hegde */ 27181f2f7ceSAlistair Popple opal_event_shutdown(); 2722196c6f1SVasant Hegde 273f2748bdfSNicholas Piggin /* Print flash update message if one is scheduled. */ 274f2748bdfSNicholas Piggin opal_flash_update_print_message(); 2752196c6f1SVasant Hegde 276f2748bdfSNicholas Piggin smp_send_stop(); 277f2748bdfSNicholas Piggin 278f2748bdfSNicholas Piggin hard_irq_disable(); 2792196c6f1SVasant Hegde } 2802196c6f1SVasant Hegde 281ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_restart(char *cmd) 28255190f88SBenjamin Herrenschmidt { 2838139046aSVaibhav Jain long rc; 284ec27329fSBenjamin Herrenschmidt 2852196c6f1SVasant Hegde pnv_prepare_going_down(); 286e8e71fa4SGavin Shan 2878139046aSVaibhav Jain do { 28816985f2dSOliver O'Halloran if (!cmd || !strlen(cmd)) 289ec27329fSBenjamin Herrenschmidt rc = opal_cec_reboot(); 2908139046aSVaibhav Jain else if (strcmp(cmd, "full") == 0) 2918139046aSVaibhav Jain rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL); 29237f6f8e8SOliver O'Halloran else if (strcmp(cmd, "mpipl") == 0) 29337f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL); 29437f6f8e8SOliver O'Halloran else if (strcmp(cmd, "error") == 0) 29537f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL); 296672e480aSOliver O'Halloran else if (strcmp(cmd, "fast") == 0) 297672e480aSOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL); 298ec27329fSBenjamin Herrenschmidt else 2998139046aSVaibhav Jain rc = OPAL_UNSUPPORTED; 3008139046aSVaibhav Jain 3018139046aSVaibhav Jain if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 3028139046aSVaibhav Jain /* Opal is busy wait for some time and retry */ 3038139046aSVaibhav Jain opal_poll_events(NULL); 304ec27329fSBenjamin Herrenschmidt mdelay(10); 3058139046aSVaibhav Jain 3068139046aSVaibhav Jain } else if (cmd && rc) { 3078139046aSVaibhav Jain /* Unknown error while issuing reboot */ 3088139046aSVaibhav Jain if (rc == OPAL_UNSUPPORTED) 3098139046aSVaibhav Jain pr_err("Unsupported '%s' reboot.\n", cmd); 3108139046aSVaibhav Jain else 3118139046aSVaibhav Jain pr_err("Unable to issue '%s' reboot. Err=%ld\n", 3128139046aSVaibhav Jain cmd, rc); 3138139046aSVaibhav Jain pr_info("Forcing a cec-reboot\n"); 3148139046aSVaibhav Jain cmd = NULL; 3158139046aSVaibhav Jain rc = OPAL_BUSY; 3168139046aSVaibhav Jain 3178139046aSVaibhav Jain } else if (rc != OPAL_SUCCESS) { 3188139046aSVaibhav Jain /* Unknown error while issuing cec-reboot */ 3198139046aSVaibhav Jain pr_err("Unable to reboot. Err=%ld\n", rc); 320ec27329fSBenjamin Herrenschmidt } 3218139046aSVaibhav Jain 3228139046aSVaibhav Jain } while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT); 3238139046aSVaibhav Jain 324ec27329fSBenjamin Herrenschmidt for (;;) 325ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 32655190f88SBenjamin Herrenschmidt } 32755190f88SBenjamin Herrenschmidt 328ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_power_off(void) 32955190f88SBenjamin Herrenschmidt { 330ec27329fSBenjamin Herrenschmidt long rc = OPAL_BUSY; 331ec27329fSBenjamin Herrenschmidt 3322196c6f1SVasant Hegde pnv_prepare_going_down(); 333e8e71fa4SGavin Shan 334ec27329fSBenjamin Herrenschmidt while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 335ec27329fSBenjamin Herrenschmidt rc = opal_cec_power_down(0); 336ec27329fSBenjamin Herrenschmidt if (rc == OPAL_BUSY_EVENT) 337ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 338ec27329fSBenjamin Herrenschmidt else 339ec27329fSBenjamin Herrenschmidt mdelay(10); 340ec27329fSBenjamin Herrenschmidt } 341ec27329fSBenjamin Herrenschmidt for (;;) 342ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 34355190f88SBenjamin Herrenschmidt } 34455190f88SBenjamin Herrenschmidt 345ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_halt(void) 34655190f88SBenjamin Herrenschmidt { 347ec27329fSBenjamin Herrenschmidt pnv_power_off(); 34855190f88SBenjamin Herrenschmidt } 34955190f88SBenjamin Herrenschmidt 35055190f88SBenjamin Herrenschmidt static void pnv_progress(char *s, unsigned short hex) 35155190f88SBenjamin Herrenschmidt { 35255190f88SBenjamin Herrenschmidt } 35355190f88SBenjamin Herrenschmidt 35473ed148aSBenjamin Herrenschmidt static void pnv_shutdown(void) 35573ed148aSBenjamin Herrenschmidt { 35673ed148aSBenjamin Herrenschmidt /* Let the PCI code clear up IODA tables */ 35773ed148aSBenjamin Herrenschmidt pnv_pci_shutdown(); 35873ed148aSBenjamin Herrenschmidt 359f7d98d18SVasant Hegde /* 360f7d98d18SVasant Hegde * Stop OPAL activity: Unregister all OPAL interrupts so they 361f7d98d18SVasant Hegde * don't fire up while we kexec and make sure all potentially 362f7d98d18SVasant Hegde * DMA'ing ops are complete (such as dump retrieval). 36373ed148aSBenjamin Herrenschmidt */ 36473ed148aSBenjamin Herrenschmidt opal_shutdown(); 36573ed148aSBenjamin Herrenschmidt } 36673ed148aSBenjamin Herrenschmidt 367da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 368298b34d7SBenjamin Herrenschmidt static void pnv_kexec_wait_secondaries_down(void) 369298b34d7SBenjamin Herrenschmidt { 370298b34d7SBenjamin Herrenschmidt int my_cpu, i, notified = -1; 371298b34d7SBenjamin Herrenschmidt 372298b34d7SBenjamin Herrenschmidt my_cpu = get_cpu(); 373298b34d7SBenjamin Herrenschmidt 374298b34d7SBenjamin Herrenschmidt for_each_online_cpu(i) { 375298b34d7SBenjamin Herrenschmidt uint8_t status; 3761b70386cSSamuel Mendoza-Jonas int64_t rc, timeout = 1000; 377298b34d7SBenjamin Herrenschmidt 378298b34d7SBenjamin Herrenschmidt if (i == my_cpu) 379298b34d7SBenjamin Herrenschmidt continue; 380298b34d7SBenjamin Herrenschmidt 381298b34d7SBenjamin Herrenschmidt for (;;) { 382298b34d7SBenjamin Herrenschmidt rc = opal_query_cpu_status(get_hard_smp_processor_id(i), 383298b34d7SBenjamin Herrenschmidt &status); 384298b34d7SBenjamin Herrenschmidt if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED) 385298b34d7SBenjamin Herrenschmidt break; 386298b34d7SBenjamin Herrenschmidt barrier(); 387298b34d7SBenjamin Herrenschmidt if (i != notified) { 388298b34d7SBenjamin Herrenschmidt printk(KERN_INFO "kexec: waiting for cpu %d " 389298b34d7SBenjamin Herrenschmidt "(physical %d) to enter OPAL\n", 390d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 391298b34d7SBenjamin Herrenschmidt notified = i; 392298b34d7SBenjamin Herrenschmidt } 3931b70386cSSamuel Mendoza-Jonas 3941b70386cSSamuel Mendoza-Jonas /* 3951b70386cSSamuel Mendoza-Jonas * On crash secondaries might be unreachable or hung, 3961b70386cSSamuel Mendoza-Jonas * so timeout if we've waited too long 3971b70386cSSamuel Mendoza-Jonas * */ 3981b70386cSSamuel Mendoza-Jonas mdelay(1); 3991b70386cSSamuel Mendoza-Jonas if (timeout-- == 0) { 4001b70386cSSamuel Mendoza-Jonas printk(KERN_ERR "kexec: timed out waiting for " 4011b70386cSSamuel Mendoza-Jonas "cpu %d (physical %d) to enter OPAL\n", 402d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 4031b70386cSSamuel Mendoza-Jonas break; 4041b70386cSSamuel Mendoza-Jonas } 405298b34d7SBenjamin Herrenschmidt } 406298b34d7SBenjamin Herrenschmidt } 407298b34d7SBenjamin Herrenschmidt } 408298b34d7SBenjamin Herrenschmidt 40955190f88SBenjamin Herrenschmidt static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 41055190f88SBenjamin Herrenschmidt { 4111c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags; 4121c0eaf0fSBenjamin Herrenschmidt 413243e2511SBenjamin Herrenschmidt if (xive_enabled()) 414e27e0a94SBenjamin Herrenschmidt xive_teardown_cpu(); 415243e2511SBenjamin Herrenschmidt else 41655190f88SBenjamin Herrenschmidt xics_kexec_teardown_cpu(secondary); 41713906db6SBenjamin Herrenschmidt 418e4d54f71SStewart Smith /* On OPAL, we return all CPUs to firmware */ 419e4d54f71SStewart Smith if (!firmware_has_feature(FW_FEATURE_OPAL)) 420298b34d7SBenjamin Herrenschmidt return; 421298b34d7SBenjamin Herrenschmidt 422298b34d7SBenjamin Herrenschmidt if (secondary) { 42313906db6SBenjamin Herrenschmidt /* Return secondary CPUs to firmware on OPAL v3 */ 42413906db6SBenjamin Herrenschmidt mb(); 42513906db6SBenjamin Herrenschmidt get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 42613906db6SBenjamin Herrenschmidt mb(); 42713906db6SBenjamin Herrenschmidt 42813906db6SBenjamin Herrenschmidt /* Return the CPU to OPAL */ 42913906db6SBenjamin Herrenschmidt opal_return_cpu(); 430298b34d7SBenjamin Herrenschmidt } else { 431298b34d7SBenjamin Herrenschmidt /* Primary waits for the secondaries to have reached OPAL */ 432298b34d7SBenjamin Herrenschmidt pnv_kexec_wait_secondaries_down(); 433e72bb8a5SSamuel Mendoza-Jonas 434243e2511SBenjamin Herrenschmidt /* Switch XIVE back to emulation mode */ 435243e2511SBenjamin Herrenschmidt if (xive_enabled()) 436243e2511SBenjamin Herrenschmidt xive_shutdown(); 437243e2511SBenjamin Herrenschmidt 438e72bb8a5SSamuel Mendoza-Jonas /* 439e72bb8a5SSamuel Mendoza-Jonas * We might be running as little-endian - now that interrupts 440e72bb8a5SSamuel Mendoza-Jonas * are disabled, reset the HILE bit to big-endian so we don't 441e72bb8a5SSamuel Mendoza-Jonas * take interrupts in the wrong endian later 4421c0eaf0fSBenjamin Herrenschmidt * 4431c0eaf0fSBenjamin Herrenschmidt * We reinit to enable both radix and hash on P9 to ensure 4441c0eaf0fSBenjamin Herrenschmidt * the mode used by the next kernel is always supported. 445e72bb8a5SSamuel Mendoza-Jonas */ 4461c0eaf0fSBenjamin Herrenschmidt reinit_flags = OPAL_REINIT_CPUS_HILE_BE; 4471c0eaf0fSBenjamin Herrenschmidt if (cpu_has_feature(CPU_FTR_ARCH_300)) 4481c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX | 4491c0eaf0fSBenjamin Herrenschmidt OPAL_REINIT_CPUS_MMU_HASH; 4501c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 45113906db6SBenjamin Herrenschmidt } 45255190f88SBenjamin Herrenschmidt } 453da665885SThiago Jung Bauermann #endif /* CONFIG_KEXEC_CORE */ 45455190f88SBenjamin Herrenschmidt 45550f9481eSDavid Hildenbrand #ifdef CONFIG_MEMORY_HOTPLUG 4566d97d7a2SAnton Blanchard static unsigned long pnv_memory_block_size(void) 4576d97d7a2SAnton Blanchard { 458af9d00e9SAneesh Kumar K.V /* 459af9d00e9SAneesh Kumar K.V * We map the kernel linear region with 1GB large pages on radix. For 460af9d00e9SAneesh Kumar K.V * memory hot unplug to work our memory block size must be at least 461af9d00e9SAneesh Kumar K.V * this size. 462af9d00e9SAneesh Kumar K.V */ 463af9d00e9SAneesh Kumar K.V if (radix_enabled()) 464af9d00e9SAneesh Kumar K.V return radix_mem_block_size; 465af9d00e9SAneesh Kumar K.V else 4666d97d7a2SAnton Blanchard return 256UL * 1024 * 1024; 4676d97d7a2SAnton Blanchard } 4686d97d7a2SAnton Blanchard #endif 4696d97d7a2SAnton Blanchard 470628daa8dSBenjamin Herrenschmidt static void __init pnv_setup_machdep_opal(void) 471628daa8dSBenjamin Herrenschmidt { 472628daa8dSBenjamin Herrenschmidt ppc_md.get_boot_time = opal_get_boot_time; 473628daa8dSBenjamin Herrenschmidt ppc_md.restart = pnv_restart; 4749178ba29SAlexander Graf pm_power_off = pnv_power_off; 475628daa8dSBenjamin Herrenschmidt ppc_md.halt = pnv_halt; 476e36d0a2eSNicholas Piggin /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */ 477ed79ba9eSBenjamin Herrenschmidt ppc_md.machine_check_exception = opal_machine_check; 47855672ecfSMahesh Salgaonkar ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; 479de269129SMahesh Salgaonkar if (opal_check_token(OPAL_HANDLE_HMI2)) 480de269129SMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early2; 481de269129SMahesh Salgaonkar else 4820869b6fdSMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early; 4830869b6fdSMahesh Salgaonkar ppc_md.handle_hmi_exception = opal_handle_hmi_exception; 484628daa8dSBenjamin Herrenschmidt } 485628daa8dSBenjamin Herrenschmidt 48655190f88SBenjamin Herrenschmidt static int __init pnv_probe(void) 48755190f88SBenjamin Herrenschmidt { 488406b0b6aSBenjamin Herrenschmidt if (!of_machine_is_compatible("ibm,powernv")) 48955190f88SBenjamin Herrenschmidt return 0; 49055190f88SBenjamin Herrenschmidt 491628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 492628daa8dSBenjamin Herrenschmidt pnv_setup_machdep_opal(); 493628daa8dSBenjamin Herrenschmidt 49455190f88SBenjamin Herrenschmidt pr_debug("PowerNV detected !\n"); 49555190f88SBenjamin Herrenschmidt 496f2d57694SBenjamin Herrenschmidt pnv_init(); 497f2d57694SBenjamin Herrenschmidt 49855190f88SBenjamin Herrenschmidt return 1; 49955190f88SBenjamin Herrenschmidt } 50055190f88SBenjamin Herrenschmidt 50154820530SMichael Ellerman #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 50254820530SMichael Ellerman void __init pnv_tm_init(void) 50354820530SMichael Ellerman { 50454820530SMichael Ellerman if (!firmware_has_feature(FW_FEATURE_OPAL) || 50554820530SMichael Ellerman !pvr_version_is(PVR_POWER9) || 50654820530SMichael Ellerman early_cpu_has_feature(CPU_FTR_TM)) 50754820530SMichael Ellerman return; 50854820530SMichael Ellerman 50954820530SMichael Ellerman if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS) 51054820530SMichael Ellerman return; 51154820530SMichael Ellerman 51254820530SMichael Ellerman pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n"); 51354820530SMichael Ellerman cur_cpu_spec->cpu_features |= CPU_FTR_TM; 51454820530SMichael Ellerman /* Make sure "normal" HTM is off (it should be) */ 51554820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM; 51654820530SMichael Ellerman /* Turn on no suspend mode, and HTM no SC */ 51754820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \ 51854820530SMichael Ellerman PPC_FEATURE2_HTM_NOSC; 51954820530SMichael Ellerman tm_suspend_disabled = true; 52054820530SMichael Ellerman } 52154820530SMichael Ellerman #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 52254820530SMichael Ellerman 523fb5153d0SGautham R. Shenoy /* 524fb5153d0SGautham R. Shenoy * Returns the cpu frequency for 'cpu' in Hz. This is used by 525fb5153d0SGautham R. Shenoy * /proc/cpuinfo 526fb5153d0SGautham R. Shenoy */ 527e51df2c1SAnton Blanchard static unsigned long pnv_get_proc_freq(unsigned int cpu) 528fb5153d0SGautham R. Shenoy { 529fb5153d0SGautham R. Shenoy unsigned long ret_freq; 530fb5153d0SGautham R. Shenoy 531cd77b5ceSShriya ret_freq = cpufreq_get(cpu) * 1000ul; 532fb5153d0SGautham R. Shenoy 533fb5153d0SGautham R. Shenoy /* 534fb5153d0SGautham R. Shenoy * If the backend cpufreq driver does not exist, 535fb5153d0SGautham R. Shenoy * then fallback to old way of reporting the clockrate. 536fb5153d0SGautham R. Shenoy */ 537fb5153d0SGautham R. Shenoy if (!ret_freq) 538fb5153d0SGautham R. Shenoy ret_freq = ppc_proc_freq; 539fb5153d0SGautham R. Shenoy return ret_freq; 540fb5153d0SGautham R. Shenoy } 541fb5153d0SGautham R. Shenoy 542a43c1590SMahesh Salgaonkar static long pnv_machine_check_early(struct pt_regs *regs) 543a43c1590SMahesh Salgaonkar { 544a43c1590SMahesh Salgaonkar long handled = 0; 545a43c1590SMahesh Salgaonkar 546a43c1590SMahesh Salgaonkar if (cur_cpu_spec && cur_cpu_spec->machine_check_early) 547a43c1590SMahesh Salgaonkar handled = cur_cpu_spec->machine_check_early(regs); 548a43c1590SMahesh Salgaonkar 549a43c1590SMahesh Salgaonkar return handled; 550a43c1590SMahesh Salgaonkar } 551a43c1590SMahesh Salgaonkar 55255190f88SBenjamin Herrenschmidt define_machine(powernv) { 55355190f88SBenjamin Herrenschmidt .name = "PowerNV", 55455190f88SBenjamin Herrenschmidt .probe = pnv_probe, 555628daa8dSBenjamin Herrenschmidt .setup_arch = pnv_setup_arch, 55655190f88SBenjamin Herrenschmidt .init_IRQ = pnv_init_IRQ, 55755190f88SBenjamin Herrenschmidt .show_cpuinfo = pnv_show_cpuinfo, 558fb5153d0SGautham R. Shenoy .get_proc_freq = pnv_get_proc_freq, 559fbbefb32SOliver O'Halloran .discover_phbs = pnv_pci_init, 56055190f88SBenjamin Herrenschmidt .progress = pnv_progress, 56173ed148aSBenjamin Herrenschmidt .machine_shutdown = pnv_shutdown, 5625593e303SShreyas B. Prabhu .power_save = NULL, 56355190f88SBenjamin Herrenschmidt .calibrate_decr = generic_calibrate_decr, 564a43c1590SMahesh Salgaonkar .machine_check_early = pnv_machine_check_early, 565da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 56655190f88SBenjamin Herrenschmidt .kexec_cpu_down = pnv_kexec_cpu_down, 56755190f88SBenjamin Herrenschmidt #endif 56850f9481eSDavid Hildenbrand #ifdef CONFIG_MEMORY_HOTPLUG 5696d97d7a2SAnton Blanchard .memory_block_size = pnv_memory_block_size, 5706d97d7a2SAnton Blanchard #endif 57155190f88SBenjamin Herrenschmidt }; 572