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 4377addf6eSMichael Ellerman static bool 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 5877addf6eSMichael Ellerman static void 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); 9977addf6eSMichael Ellerman } 10077addf6eSMichael Ellerman 1016e032b35SOliver O'Halloran static void pnv_setup_rfi_flush(void) 1026e032b35SOliver O'Halloran { 1036e032b35SOliver O'Halloran struct device_node *np, *fw_features; 1046e032b35SOliver O'Halloran enum l1d_flush_type type; 10537c0bdd0SMichael Ellerman bool enable; 1066e032b35SOliver O'Halloran 1076e032b35SOliver O'Halloran /* Default to fallback in case fw-features are not available */ 1086e032b35SOliver O'Halloran type = L1D_FLUSH_FALLBACK; 1096e032b35SOliver O'Halloran 1106e032b35SOliver O'Halloran np = of_find_node_by_name(NULL, "ibm,opal"); 1116e032b35SOliver O'Halloran fw_features = of_get_child_by_name(np, "fw-features"); 1126e032b35SOliver O'Halloran of_node_put(np); 1136e032b35SOliver O'Halloran 1146e032b35SOliver O'Halloran if (fw_features) { 11577addf6eSMichael Ellerman init_fw_feat_flags(fw_features); 11637c0bdd0SMichael Ellerman of_node_put(fw_features); 11777addf6eSMichael Ellerman 11837c0bdd0SMichael Ellerman if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2)) 1196e032b35SOliver O'Halloran type = L1D_FLUSH_MTTRIG; 1206e032b35SOliver O'Halloran 12137c0bdd0SMichael Ellerman if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30)) 1226e032b35SOliver O'Halloran type = L1D_FLUSH_ORI; 1236e032b35SOliver O'Halloran } 1246e032b35SOliver O'Halloran 12537c0bdd0SMichael Ellerman enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \ 12637c0bdd0SMichael Ellerman (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \ 12737c0bdd0SMichael Ellerman security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV)); 12837c0bdd0SMichael Ellerman 12937c0bdd0SMichael Ellerman setup_rfi_flush(type, enable); 13099d54754SMichael Ellerman setup_count_cache_flush(); 1316e032b35SOliver O'Halloran } 1326e032b35SOliver O'Halloran 1338f55984fSJoel Stanley static void __init pnv_check_guarded_cores(void) 1348f55984fSJoel Stanley { 1358f55984fSJoel Stanley struct device_node *dn; 1368f55984fSJoel Stanley int bad_count = 0; 1378f55984fSJoel Stanley 1388f55984fSJoel Stanley for_each_node_by_type(dn, "cpu") { 1398f55984fSJoel Stanley if (of_property_match_string(dn, "status", "bad") >= 0) 1408f55984fSJoel Stanley bad_count++; 1418f55984fSJoel Stanley }; 1428f55984fSJoel Stanley 1438f55984fSJoel Stanley if (bad_count) { 1448f55984fSJoel Stanley printk(" _ _______________\n"); 1458f55984fSJoel Stanley pr_cont(" | | / \\\n"); 1468f55984fSJoel Stanley pr_cont(" | | | WARNING! |\n"); 1478f55984fSJoel Stanley pr_cont(" | | | |\n"); 1488f55984fSJoel Stanley pr_cont(" | | | It looks like |\n"); 1498f55984fSJoel Stanley pr_cont(" |_| | you have %*d |\n", 3, bad_count); 1508f55984fSJoel Stanley pr_cont(" _ | guarded cores |\n"); 1518f55984fSJoel Stanley pr_cont(" (_) \\_______________/\n"); 1528f55984fSJoel Stanley } 1538f55984fSJoel Stanley } 1548f55984fSJoel Stanley 15555190f88SBenjamin Herrenschmidt static void __init pnv_setup_arch(void) 15655190f88SBenjamin Herrenschmidt { 1574817fc32SAnton Blanchard set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 1584817fc32SAnton Blanchard 1596e032b35SOliver O'Halloran pnv_setup_rfi_flush(); 160a048a07dSNicholas Piggin setup_stf_barrier(); 1616e032b35SOliver O'Halloran 16255190f88SBenjamin Herrenschmidt /* Initialize SMP */ 16355190f88SBenjamin Herrenschmidt pnv_smp_init(); 16455190f88SBenjamin Herrenschmidt 16561305a96SBenjamin Herrenschmidt /* Setup PCI */ 16661305a96SBenjamin Herrenschmidt pnv_pci_init(); 16755190f88SBenjamin Herrenschmidt 168628daa8dSBenjamin Herrenschmidt /* Setup RTC and NVRAM callbacks */ 169628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 170628daa8dSBenjamin Herrenschmidt opal_nvram_init(); 17155190f88SBenjamin Herrenschmidt 17255190f88SBenjamin Herrenschmidt /* Enable NAP mode */ 17355190f88SBenjamin Herrenschmidt powersave_nap = 1; 17455190f88SBenjamin Herrenschmidt 1758f55984fSJoel Stanley pnv_check_guarded_cores(); 1768f55984fSJoel Stanley 17755190f88SBenjamin Herrenschmidt /* XXX PMCS */ 17855190f88SBenjamin Herrenschmidt } 17955190f88SBenjamin Herrenschmidt 180f2d57694SBenjamin Herrenschmidt static void __init pnv_init(void) 18155190f88SBenjamin Herrenschmidt { 1823fafe9c2SBenjamin Herrenschmidt /* 1833fafe9c2SBenjamin Herrenschmidt * Initialize the LPC bus now so that legacy serial 1843fafe9c2SBenjamin Herrenschmidt * ports can be found on it 1853fafe9c2SBenjamin Herrenschmidt */ 1863fafe9c2SBenjamin Herrenschmidt opal_lpc_init(); 1873fafe9c2SBenjamin Herrenschmidt 188daea1175SBenjamin Herrenschmidt #ifdef CONFIG_HVC_OPAL 189daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 190daea1175SBenjamin Herrenschmidt hvc_opal_init_early(); 191daea1175SBenjamin Herrenschmidt else 192daea1175SBenjamin Herrenschmidt #endif 193daea1175SBenjamin Herrenschmidt add_preferred_console("hvc", 0, NULL); 1947290f3b3SNicholas Piggin 1957290f3b3SNicholas Piggin if (!radix_enabled()) { 1967290f3b3SNicholas Piggin int i; 1977290f3b3SNicholas Piggin 1987290f3b3SNicholas Piggin /* Allocate per cpu area to save old slb contents during MCE */ 1997290f3b3SNicholas Piggin for_each_possible_cpu(i) 2007290f3b3SNicholas Piggin paca_ptrs[i]->mce_faulty_slbs = memblock_alloc_node(mmu_slb_size, __alignof__(*paca_ptrs[i]->mce_faulty_slbs), cpu_to_node(i)); 2017290f3b3SNicholas Piggin } 20255190f88SBenjamin Herrenschmidt } 20355190f88SBenjamin Herrenschmidt 20455190f88SBenjamin Herrenschmidt static void __init pnv_init_IRQ(void) 20555190f88SBenjamin Herrenschmidt { 206243e2511SBenjamin Herrenschmidt /* Try using a XIVE if available, otherwise use a XICS */ 207243e2511SBenjamin Herrenschmidt if (!xive_native_init()) 20855190f88SBenjamin Herrenschmidt xics_init(); 20955190f88SBenjamin Herrenschmidt 21055190f88SBenjamin Herrenschmidt WARN_ON(!ppc_md.get_irq); 21155190f88SBenjamin Herrenschmidt } 21255190f88SBenjamin Herrenschmidt 21355190f88SBenjamin Herrenschmidt static void pnv_show_cpuinfo(struct seq_file *m) 21455190f88SBenjamin Herrenschmidt { 21555190f88SBenjamin Herrenschmidt struct device_node *root; 21655190f88SBenjamin Herrenschmidt const char *model = ""; 21755190f88SBenjamin Herrenschmidt 21855190f88SBenjamin Herrenschmidt root = of_find_node_by_path("/"); 21955190f88SBenjamin Herrenschmidt if (root) 22055190f88SBenjamin Herrenschmidt model = of_get_property(root, "model", NULL); 22155190f88SBenjamin Herrenschmidt seq_printf(m, "machine\t\t: PowerNV %s\n", model); 222e4d54f71SStewart Smith if (firmware_has_feature(FW_FEATURE_OPAL)) 223e4d54f71SStewart Smith seq_printf(m, "firmware\t: OPAL\n"); 22414a43e69SBenjamin Herrenschmidt else 22514a43e69SBenjamin Herrenschmidt seq_printf(m, "firmware\t: BML\n"); 22655190f88SBenjamin Herrenschmidt of_node_put(root); 2273a4c2601SAneesh Kumar K.V if (radix_enabled()) 2283a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Radix\n"); 2293a4c2601SAneesh Kumar K.V else 2303a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Hash\n"); 23155190f88SBenjamin Herrenschmidt } 23255190f88SBenjamin Herrenschmidt 2332196c6f1SVasant Hegde static void pnv_prepare_going_down(void) 2342196c6f1SVasant Hegde { 2352196c6f1SVasant Hegde /* 2362196c6f1SVasant Hegde * Disable all notifiers from OPAL, we can't 2372196c6f1SVasant Hegde * service interrupts anymore anyway 2382196c6f1SVasant Hegde */ 23981f2f7ceSAlistair Popple opal_event_shutdown(); 2402196c6f1SVasant Hegde 241f2748bdfSNicholas Piggin /* Print flash update message if one is scheduled. */ 242f2748bdfSNicholas Piggin opal_flash_update_print_message(); 2432196c6f1SVasant Hegde 244f2748bdfSNicholas Piggin smp_send_stop(); 245f2748bdfSNicholas Piggin 246f2748bdfSNicholas Piggin hard_irq_disable(); 2472196c6f1SVasant Hegde } 2482196c6f1SVasant Hegde 249ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_restart(char *cmd) 25055190f88SBenjamin Herrenschmidt { 2518139046aSVaibhav Jain long rc; 252ec27329fSBenjamin Herrenschmidt 2532196c6f1SVasant Hegde pnv_prepare_going_down(); 254e8e71fa4SGavin Shan 2558139046aSVaibhav Jain do { 25616985f2dSOliver O'Halloran if (!cmd || !strlen(cmd)) 257ec27329fSBenjamin Herrenschmidt rc = opal_cec_reboot(); 2588139046aSVaibhav Jain else if (strcmp(cmd, "full") == 0) 2598139046aSVaibhav Jain rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL); 26037f6f8e8SOliver O'Halloran else if (strcmp(cmd, "mpipl") == 0) 26137f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL); 26237f6f8e8SOliver O'Halloran else if (strcmp(cmd, "error") == 0) 26337f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL); 264672e480aSOliver O'Halloran else if (strcmp(cmd, "fast") == 0) 265672e480aSOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL); 266ec27329fSBenjamin Herrenschmidt else 2678139046aSVaibhav Jain rc = OPAL_UNSUPPORTED; 2688139046aSVaibhav Jain 2698139046aSVaibhav Jain if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 2708139046aSVaibhav Jain /* Opal is busy wait for some time and retry */ 2718139046aSVaibhav Jain opal_poll_events(NULL); 272ec27329fSBenjamin Herrenschmidt mdelay(10); 2738139046aSVaibhav Jain 2748139046aSVaibhav Jain } else if (cmd && rc) { 2758139046aSVaibhav Jain /* Unknown error while issuing reboot */ 2768139046aSVaibhav Jain if (rc == OPAL_UNSUPPORTED) 2778139046aSVaibhav Jain pr_err("Unsupported '%s' reboot.\n", cmd); 2788139046aSVaibhav Jain else 2798139046aSVaibhav Jain pr_err("Unable to issue '%s' reboot. Err=%ld\n", 2808139046aSVaibhav Jain cmd, rc); 2818139046aSVaibhav Jain pr_info("Forcing a cec-reboot\n"); 2828139046aSVaibhav Jain cmd = NULL; 2838139046aSVaibhav Jain rc = OPAL_BUSY; 2848139046aSVaibhav Jain 2858139046aSVaibhav Jain } else if (rc != OPAL_SUCCESS) { 2868139046aSVaibhav Jain /* Unknown error while issuing cec-reboot */ 2878139046aSVaibhav Jain pr_err("Unable to reboot. Err=%ld\n", rc); 288ec27329fSBenjamin Herrenschmidt } 2898139046aSVaibhav Jain 2908139046aSVaibhav Jain } while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT); 2918139046aSVaibhav Jain 292ec27329fSBenjamin Herrenschmidt for (;;) 293ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 29455190f88SBenjamin Herrenschmidt } 29555190f88SBenjamin Herrenschmidt 296ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_power_off(void) 29755190f88SBenjamin Herrenschmidt { 298ec27329fSBenjamin Herrenschmidt long rc = OPAL_BUSY; 299ec27329fSBenjamin Herrenschmidt 3002196c6f1SVasant Hegde pnv_prepare_going_down(); 301e8e71fa4SGavin Shan 302ec27329fSBenjamin Herrenschmidt while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 303ec27329fSBenjamin Herrenschmidt rc = opal_cec_power_down(0); 304ec27329fSBenjamin Herrenschmidt if (rc == OPAL_BUSY_EVENT) 305ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 306ec27329fSBenjamin Herrenschmidt else 307ec27329fSBenjamin Herrenschmidt mdelay(10); 308ec27329fSBenjamin Herrenschmidt } 309ec27329fSBenjamin Herrenschmidt for (;;) 310ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 31155190f88SBenjamin Herrenschmidt } 31255190f88SBenjamin Herrenschmidt 313ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_halt(void) 31455190f88SBenjamin Herrenschmidt { 315ec27329fSBenjamin Herrenschmidt pnv_power_off(); 31655190f88SBenjamin Herrenschmidt } 31755190f88SBenjamin Herrenschmidt 31855190f88SBenjamin Herrenschmidt static void pnv_progress(char *s, unsigned short hex) 31955190f88SBenjamin Herrenschmidt { 32055190f88SBenjamin Herrenschmidt } 32155190f88SBenjamin Herrenschmidt 32273ed148aSBenjamin Herrenschmidt static void pnv_shutdown(void) 32373ed148aSBenjamin Herrenschmidt { 32473ed148aSBenjamin Herrenschmidt /* Let the PCI code clear up IODA tables */ 32573ed148aSBenjamin Herrenschmidt pnv_pci_shutdown(); 32673ed148aSBenjamin Herrenschmidt 327f7d98d18SVasant Hegde /* 328f7d98d18SVasant Hegde * Stop OPAL activity: Unregister all OPAL interrupts so they 329f7d98d18SVasant Hegde * don't fire up while we kexec and make sure all potentially 330f7d98d18SVasant Hegde * DMA'ing ops are complete (such as dump retrieval). 33173ed148aSBenjamin Herrenschmidt */ 33273ed148aSBenjamin Herrenschmidt opal_shutdown(); 33373ed148aSBenjamin Herrenschmidt } 33473ed148aSBenjamin Herrenschmidt 335da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 336298b34d7SBenjamin Herrenschmidt static void pnv_kexec_wait_secondaries_down(void) 337298b34d7SBenjamin Herrenschmidt { 338298b34d7SBenjamin Herrenschmidt int my_cpu, i, notified = -1; 339298b34d7SBenjamin Herrenschmidt 340298b34d7SBenjamin Herrenschmidt my_cpu = get_cpu(); 341298b34d7SBenjamin Herrenschmidt 342298b34d7SBenjamin Herrenschmidt for_each_online_cpu(i) { 343298b34d7SBenjamin Herrenschmidt uint8_t status; 3441b70386cSSamuel Mendoza-Jonas int64_t rc, timeout = 1000; 345298b34d7SBenjamin Herrenschmidt 346298b34d7SBenjamin Herrenschmidt if (i == my_cpu) 347298b34d7SBenjamin Herrenschmidt continue; 348298b34d7SBenjamin Herrenschmidt 349298b34d7SBenjamin Herrenschmidt for (;;) { 350298b34d7SBenjamin Herrenschmidt rc = opal_query_cpu_status(get_hard_smp_processor_id(i), 351298b34d7SBenjamin Herrenschmidt &status); 352298b34d7SBenjamin Herrenschmidt if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED) 353298b34d7SBenjamin Herrenschmidt break; 354298b34d7SBenjamin Herrenschmidt barrier(); 355298b34d7SBenjamin Herrenschmidt if (i != notified) { 356298b34d7SBenjamin Herrenschmidt printk(KERN_INFO "kexec: waiting for cpu %d " 357298b34d7SBenjamin Herrenschmidt "(physical %d) to enter OPAL\n", 358d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 359298b34d7SBenjamin Herrenschmidt notified = i; 360298b34d7SBenjamin Herrenschmidt } 3611b70386cSSamuel Mendoza-Jonas 3621b70386cSSamuel Mendoza-Jonas /* 3631b70386cSSamuel Mendoza-Jonas * On crash secondaries might be unreachable or hung, 3641b70386cSSamuel Mendoza-Jonas * so timeout if we've waited too long 3651b70386cSSamuel Mendoza-Jonas * */ 3661b70386cSSamuel Mendoza-Jonas mdelay(1); 3671b70386cSSamuel Mendoza-Jonas if (timeout-- == 0) { 3681b70386cSSamuel Mendoza-Jonas printk(KERN_ERR "kexec: timed out waiting for " 3691b70386cSSamuel Mendoza-Jonas "cpu %d (physical %d) to enter OPAL\n", 370d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 3711b70386cSSamuel Mendoza-Jonas break; 3721b70386cSSamuel Mendoza-Jonas } 373298b34d7SBenjamin Herrenschmidt } 374298b34d7SBenjamin Herrenschmidt } 375298b34d7SBenjamin Herrenschmidt } 376298b34d7SBenjamin Herrenschmidt 37755190f88SBenjamin Herrenschmidt static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 37855190f88SBenjamin Herrenschmidt { 3791c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags; 3801c0eaf0fSBenjamin Herrenschmidt 381243e2511SBenjamin Herrenschmidt if (xive_enabled()) 382e27e0a94SBenjamin Herrenschmidt xive_teardown_cpu(); 383243e2511SBenjamin Herrenschmidt else 38455190f88SBenjamin Herrenschmidt xics_kexec_teardown_cpu(secondary); 38513906db6SBenjamin Herrenschmidt 386e4d54f71SStewart Smith /* On OPAL, we return all CPUs to firmware */ 387e4d54f71SStewart Smith if (!firmware_has_feature(FW_FEATURE_OPAL)) 388298b34d7SBenjamin Herrenschmidt return; 389298b34d7SBenjamin Herrenschmidt 390298b34d7SBenjamin Herrenschmidt if (secondary) { 39113906db6SBenjamin Herrenschmidt /* Return secondary CPUs to firmware on OPAL v3 */ 39213906db6SBenjamin Herrenschmidt mb(); 39313906db6SBenjamin Herrenschmidt get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 39413906db6SBenjamin Herrenschmidt mb(); 39513906db6SBenjamin Herrenschmidt 39613906db6SBenjamin Herrenschmidt /* Return the CPU to OPAL */ 39713906db6SBenjamin Herrenschmidt opal_return_cpu(); 398298b34d7SBenjamin Herrenschmidt } else { 399298b34d7SBenjamin Herrenschmidt /* Primary waits for the secondaries to have reached OPAL */ 400298b34d7SBenjamin Herrenschmidt pnv_kexec_wait_secondaries_down(); 401e72bb8a5SSamuel Mendoza-Jonas 402243e2511SBenjamin Herrenschmidt /* Switch XIVE back to emulation mode */ 403243e2511SBenjamin Herrenschmidt if (xive_enabled()) 404243e2511SBenjamin Herrenschmidt xive_shutdown(); 405243e2511SBenjamin Herrenschmidt 406e72bb8a5SSamuel Mendoza-Jonas /* 407e72bb8a5SSamuel Mendoza-Jonas * We might be running as little-endian - now that interrupts 408e72bb8a5SSamuel Mendoza-Jonas * are disabled, reset the HILE bit to big-endian so we don't 409e72bb8a5SSamuel Mendoza-Jonas * take interrupts in the wrong endian later 4101c0eaf0fSBenjamin Herrenschmidt * 4111c0eaf0fSBenjamin Herrenschmidt * We reinit to enable both radix and hash on P9 to ensure 4121c0eaf0fSBenjamin Herrenschmidt * the mode used by the next kernel is always supported. 413e72bb8a5SSamuel Mendoza-Jonas */ 4141c0eaf0fSBenjamin Herrenschmidt reinit_flags = OPAL_REINIT_CPUS_HILE_BE; 4151c0eaf0fSBenjamin Herrenschmidt if (cpu_has_feature(CPU_FTR_ARCH_300)) 4161c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX | 4171c0eaf0fSBenjamin Herrenschmidt OPAL_REINIT_CPUS_MMU_HASH; 4181c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 41913906db6SBenjamin Herrenschmidt } 42055190f88SBenjamin Herrenschmidt } 421da665885SThiago Jung Bauermann #endif /* CONFIG_KEXEC_CORE */ 42255190f88SBenjamin Herrenschmidt 4236d97d7a2SAnton Blanchard #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 4246d97d7a2SAnton Blanchard static unsigned long pnv_memory_block_size(void) 4256d97d7a2SAnton Blanchard { 426af9d00e9SAneesh Kumar K.V /* 427af9d00e9SAneesh Kumar K.V * We map the kernel linear region with 1GB large pages on radix. For 428af9d00e9SAneesh Kumar K.V * memory hot unplug to work our memory block size must be at least 429af9d00e9SAneesh Kumar K.V * this size. 430af9d00e9SAneesh Kumar K.V */ 431af9d00e9SAneesh Kumar K.V if (radix_enabled()) 432af9d00e9SAneesh Kumar K.V return radix_mem_block_size; 433af9d00e9SAneesh Kumar K.V else 4346d97d7a2SAnton Blanchard return 256UL * 1024 * 1024; 4356d97d7a2SAnton Blanchard } 4366d97d7a2SAnton Blanchard #endif 4376d97d7a2SAnton Blanchard 438628daa8dSBenjamin Herrenschmidt static void __init pnv_setup_machdep_opal(void) 439628daa8dSBenjamin Herrenschmidt { 440628daa8dSBenjamin Herrenschmidt ppc_md.get_boot_time = opal_get_boot_time; 441628daa8dSBenjamin Herrenschmidt ppc_md.restart = pnv_restart; 4429178ba29SAlexander Graf pm_power_off = pnv_power_off; 443628daa8dSBenjamin Herrenschmidt ppc_md.halt = pnv_halt; 444e36d0a2eSNicholas Piggin /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */ 445ed79ba9eSBenjamin Herrenschmidt ppc_md.machine_check_exception = opal_machine_check; 44655672ecfSMahesh Salgaonkar ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; 447de269129SMahesh Salgaonkar if (opal_check_token(OPAL_HANDLE_HMI2)) 448de269129SMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early2; 449de269129SMahesh Salgaonkar else 4500869b6fdSMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early; 4510869b6fdSMahesh Salgaonkar ppc_md.handle_hmi_exception = opal_handle_hmi_exception; 452628daa8dSBenjamin Herrenschmidt } 453628daa8dSBenjamin Herrenschmidt 45455190f88SBenjamin Herrenschmidt static int __init pnv_probe(void) 45555190f88SBenjamin Herrenschmidt { 456406b0b6aSBenjamin Herrenschmidt if (!of_machine_is_compatible("ibm,powernv")) 45755190f88SBenjamin Herrenschmidt return 0; 45855190f88SBenjamin Herrenschmidt 459628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 460628daa8dSBenjamin Herrenschmidt pnv_setup_machdep_opal(); 461628daa8dSBenjamin Herrenschmidt 46255190f88SBenjamin Herrenschmidt pr_debug("PowerNV detected !\n"); 46355190f88SBenjamin Herrenschmidt 464f2d57694SBenjamin Herrenschmidt pnv_init(); 465f2d57694SBenjamin Herrenschmidt 46655190f88SBenjamin Herrenschmidt return 1; 46755190f88SBenjamin Herrenschmidt } 46855190f88SBenjamin Herrenschmidt 46954820530SMichael Ellerman #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 47054820530SMichael Ellerman void __init pnv_tm_init(void) 47154820530SMichael Ellerman { 47254820530SMichael Ellerman if (!firmware_has_feature(FW_FEATURE_OPAL) || 47354820530SMichael Ellerman !pvr_version_is(PVR_POWER9) || 47454820530SMichael Ellerman early_cpu_has_feature(CPU_FTR_TM)) 47554820530SMichael Ellerman return; 47654820530SMichael Ellerman 47754820530SMichael Ellerman if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS) 47854820530SMichael Ellerman return; 47954820530SMichael Ellerman 48054820530SMichael Ellerman pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n"); 48154820530SMichael Ellerman cur_cpu_spec->cpu_features |= CPU_FTR_TM; 48254820530SMichael Ellerman /* Make sure "normal" HTM is off (it should be) */ 48354820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM; 48454820530SMichael Ellerman /* Turn on no suspend mode, and HTM no SC */ 48554820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \ 48654820530SMichael Ellerman PPC_FEATURE2_HTM_NOSC; 48754820530SMichael Ellerman tm_suspend_disabled = true; 48854820530SMichael Ellerman } 48954820530SMichael Ellerman #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 49054820530SMichael Ellerman 491fb5153d0SGautham R. Shenoy /* 492fb5153d0SGautham R. Shenoy * Returns the cpu frequency for 'cpu' in Hz. This is used by 493fb5153d0SGautham R. Shenoy * /proc/cpuinfo 494fb5153d0SGautham R. Shenoy */ 495e51df2c1SAnton Blanchard static unsigned long pnv_get_proc_freq(unsigned int cpu) 496fb5153d0SGautham R. Shenoy { 497fb5153d0SGautham R. Shenoy unsigned long ret_freq; 498fb5153d0SGautham R. Shenoy 499cd77b5ceSShriya ret_freq = cpufreq_get(cpu) * 1000ul; 500fb5153d0SGautham R. Shenoy 501fb5153d0SGautham R. Shenoy /* 502fb5153d0SGautham R. Shenoy * If the backend cpufreq driver does not exist, 503fb5153d0SGautham R. Shenoy * then fallback to old way of reporting the clockrate. 504fb5153d0SGautham R. Shenoy */ 505fb5153d0SGautham R. Shenoy if (!ret_freq) 506fb5153d0SGautham R. Shenoy ret_freq = ppc_proc_freq; 507fb5153d0SGautham R. Shenoy return ret_freq; 508fb5153d0SGautham R. Shenoy } 509fb5153d0SGautham R. Shenoy 510a43c1590SMahesh Salgaonkar static long pnv_machine_check_early(struct pt_regs *regs) 511a43c1590SMahesh Salgaonkar { 512a43c1590SMahesh Salgaonkar long handled = 0; 513a43c1590SMahesh Salgaonkar 514a43c1590SMahesh Salgaonkar if (cur_cpu_spec && cur_cpu_spec->machine_check_early) 515a43c1590SMahesh Salgaonkar handled = cur_cpu_spec->machine_check_early(regs); 516a43c1590SMahesh Salgaonkar 517a43c1590SMahesh Salgaonkar return handled; 518a43c1590SMahesh Salgaonkar } 519a43c1590SMahesh Salgaonkar 52055190f88SBenjamin Herrenschmidt define_machine(powernv) { 52155190f88SBenjamin Herrenschmidt .name = "PowerNV", 52255190f88SBenjamin Herrenschmidt .probe = pnv_probe, 523628daa8dSBenjamin Herrenschmidt .setup_arch = pnv_setup_arch, 52455190f88SBenjamin Herrenschmidt .init_IRQ = pnv_init_IRQ, 52555190f88SBenjamin Herrenschmidt .show_cpuinfo = pnv_show_cpuinfo, 526fb5153d0SGautham R. Shenoy .get_proc_freq = pnv_get_proc_freq, 52755190f88SBenjamin Herrenschmidt .progress = pnv_progress, 52873ed148aSBenjamin Herrenschmidt .machine_shutdown = pnv_shutdown, 5295593e303SShreyas B. Prabhu .power_save = NULL, 53055190f88SBenjamin Herrenschmidt .calibrate_decr = generic_calibrate_decr, 531a43c1590SMahesh Salgaonkar .machine_check_early = pnv_machine_check_early, 532da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 53355190f88SBenjamin Herrenschmidt .kexec_cpu_down = pnv_kexec_cpu_down, 53455190f88SBenjamin Herrenschmidt #endif 5356d97d7a2SAnton Blanchard #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 5366d97d7a2SAnton Blanchard .memory_block_size = pnv_memory_block_size, 5376d97d7a2SAnton Blanchard #endif 53855190f88SBenjamin Herrenschmidt }; 539