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 13355190f88SBenjamin Herrenschmidt static void __init pnv_setup_arch(void) 13455190f88SBenjamin Herrenschmidt { 1354817fc32SAnton Blanchard set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); 1364817fc32SAnton Blanchard 1376e032b35SOliver O'Halloran pnv_setup_rfi_flush(); 138a048a07dSNicholas Piggin setup_stf_barrier(); 1396e032b35SOliver O'Halloran 14055190f88SBenjamin Herrenschmidt /* Initialize SMP */ 14155190f88SBenjamin Herrenschmidt pnv_smp_init(); 14255190f88SBenjamin Herrenschmidt 14361305a96SBenjamin Herrenschmidt /* Setup PCI */ 14461305a96SBenjamin Herrenschmidt pnv_pci_init(); 14555190f88SBenjamin Herrenschmidt 146628daa8dSBenjamin Herrenschmidt /* Setup RTC and NVRAM callbacks */ 147628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 148628daa8dSBenjamin Herrenschmidt opal_nvram_init(); 14955190f88SBenjamin Herrenschmidt 15055190f88SBenjamin Herrenschmidt /* Enable NAP mode */ 15155190f88SBenjamin Herrenschmidt powersave_nap = 1; 15255190f88SBenjamin Herrenschmidt 15355190f88SBenjamin Herrenschmidt /* XXX PMCS */ 15455190f88SBenjamin Herrenschmidt } 15555190f88SBenjamin Herrenschmidt 156f2d57694SBenjamin Herrenschmidt static void __init pnv_init(void) 15755190f88SBenjamin Herrenschmidt { 1583fafe9c2SBenjamin Herrenschmidt /* 1593fafe9c2SBenjamin Herrenschmidt * Initialize the LPC bus now so that legacy serial 1603fafe9c2SBenjamin Herrenschmidt * ports can be found on it 1613fafe9c2SBenjamin Herrenschmidt */ 1623fafe9c2SBenjamin Herrenschmidt opal_lpc_init(); 1633fafe9c2SBenjamin Herrenschmidt 164daea1175SBenjamin Herrenschmidt #ifdef CONFIG_HVC_OPAL 165daea1175SBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 166daea1175SBenjamin Herrenschmidt hvc_opal_init_early(); 167daea1175SBenjamin Herrenschmidt else 168daea1175SBenjamin Herrenschmidt #endif 169daea1175SBenjamin Herrenschmidt add_preferred_console("hvc", 0, NULL); 1707290f3b3SNicholas Piggin 1717290f3b3SNicholas Piggin if (!radix_enabled()) { 1727290f3b3SNicholas Piggin int i; 1737290f3b3SNicholas Piggin 1747290f3b3SNicholas Piggin /* Allocate per cpu area to save old slb contents during MCE */ 1757290f3b3SNicholas Piggin for_each_possible_cpu(i) 1767290f3b3SNicholas Piggin paca_ptrs[i]->mce_faulty_slbs = memblock_alloc_node(mmu_slb_size, __alignof__(*paca_ptrs[i]->mce_faulty_slbs), cpu_to_node(i)); 1777290f3b3SNicholas Piggin } 17855190f88SBenjamin Herrenschmidt } 17955190f88SBenjamin Herrenschmidt 18055190f88SBenjamin Herrenschmidt static void __init pnv_init_IRQ(void) 18155190f88SBenjamin Herrenschmidt { 182243e2511SBenjamin Herrenschmidt /* Try using a XIVE if available, otherwise use a XICS */ 183243e2511SBenjamin Herrenschmidt if (!xive_native_init()) 18455190f88SBenjamin Herrenschmidt xics_init(); 18555190f88SBenjamin Herrenschmidt 18655190f88SBenjamin Herrenschmidt WARN_ON(!ppc_md.get_irq); 18755190f88SBenjamin Herrenschmidt } 18855190f88SBenjamin Herrenschmidt 18955190f88SBenjamin Herrenschmidt static void pnv_show_cpuinfo(struct seq_file *m) 19055190f88SBenjamin Herrenschmidt { 19155190f88SBenjamin Herrenschmidt struct device_node *root; 19255190f88SBenjamin Herrenschmidt const char *model = ""; 19355190f88SBenjamin Herrenschmidt 19455190f88SBenjamin Herrenschmidt root = of_find_node_by_path("/"); 19555190f88SBenjamin Herrenschmidt if (root) 19655190f88SBenjamin Herrenschmidt model = of_get_property(root, "model", NULL); 19755190f88SBenjamin Herrenschmidt seq_printf(m, "machine\t\t: PowerNV %s\n", model); 198e4d54f71SStewart Smith if (firmware_has_feature(FW_FEATURE_OPAL)) 199e4d54f71SStewart Smith seq_printf(m, "firmware\t: OPAL\n"); 20014a43e69SBenjamin Herrenschmidt else 20114a43e69SBenjamin Herrenschmidt seq_printf(m, "firmware\t: BML\n"); 20255190f88SBenjamin Herrenschmidt of_node_put(root); 2033a4c2601SAneesh Kumar K.V if (radix_enabled()) 2043a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Radix\n"); 2053a4c2601SAneesh Kumar K.V else 2063a4c2601SAneesh Kumar K.V seq_printf(m, "MMU\t\t: Hash\n"); 20755190f88SBenjamin Herrenschmidt } 20855190f88SBenjamin Herrenschmidt 2092196c6f1SVasant Hegde static void pnv_prepare_going_down(void) 2102196c6f1SVasant Hegde { 2112196c6f1SVasant Hegde /* 2122196c6f1SVasant Hegde * Disable all notifiers from OPAL, we can't 2132196c6f1SVasant Hegde * service interrupts anymore anyway 2142196c6f1SVasant Hegde */ 21581f2f7ceSAlistair Popple opal_event_shutdown(); 2162196c6f1SVasant Hegde 217f2748bdfSNicholas Piggin /* Print flash update message if one is scheduled. */ 218f2748bdfSNicholas Piggin opal_flash_update_print_message(); 2192196c6f1SVasant Hegde 220f2748bdfSNicholas Piggin smp_send_stop(); 221f2748bdfSNicholas Piggin 222f2748bdfSNicholas Piggin hard_irq_disable(); 2232196c6f1SVasant Hegde } 2242196c6f1SVasant Hegde 225ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_restart(char *cmd) 22655190f88SBenjamin Herrenschmidt { 2278139046aSVaibhav Jain long rc; 228ec27329fSBenjamin Herrenschmidt 2292196c6f1SVasant Hegde pnv_prepare_going_down(); 230e8e71fa4SGavin Shan 2318139046aSVaibhav Jain do { 23216985f2dSOliver O'Halloran if (!cmd || !strlen(cmd)) 233ec27329fSBenjamin Herrenschmidt rc = opal_cec_reboot(); 2348139046aSVaibhav Jain else if (strcmp(cmd, "full") == 0) 2358139046aSVaibhav Jain rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL); 23637f6f8e8SOliver O'Halloran else if (strcmp(cmd, "mpipl") == 0) 23737f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL); 23837f6f8e8SOliver O'Halloran else if (strcmp(cmd, "error") == 0) 23937f6f8e8SOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL); 240672e480aSOliver O'Halloran else if (strcmp(cmd, "fast") == 0) 241672e480aSOliver O'Halloran rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL); 242ec27329fSBenjamin Herrenschmidt else 2438139046aSVaibhav Jain rc = OPAL_UNSUPPORTED; 2448139046aSVaibhav Jain 2458139046aSVaibhav Jain if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 2468139046aSVaibhav Jain /* Opal is busy wait for some time and retry */ 2478139046aSVaibhav Jain opal_poll_events(NULL); 248ec27329fSBenjamin Herrenschmidt mdelay(10); 2498139046aSVaibhav Jain 2508139046aSVaibhav Jain } else if (cmd && rc) { 2518139046aSVaibhav Jain /* Unknown error while issuing reboot */ 2528139046aSVaibhav Jain if (rc == OPAL_UNSUPPORTED) 2538139046aSVaibhav Jain pr_err("Unsupported '%s' reboot.\n", cmd); 2548139046aSVaibhav Jain else 2558139046aSVaibhav Jain pr_err("Unable to issue '%s' reboot. Err=%ld\n", 2568139046aSVaibhav Jain cmd, rc); 2578139046aSVaibhav Jain pr_info("Forcing a cec-reboot\n"); 2588139046aSVaibhav Jain cmd = NULL; 2598139046aSVaibhav Jain rc = OPAL_BUSY; 2608139046aSVaibhav Jain 2618139046aSVaibhav Jain } else if (rc != OPAL_SUCCESS) { 2628139046aSVaibhav Jain /* Unknown error while issuing cec-reboot */ 2638139046aSVaibhav Jain pr_err("Unable to reboot. Err=%ld\n", rc); 264ec27329fSBenjamin Herrenschmidt } 2658139046aSVaibhav Jain 2668139046aSVaibhav Jain } while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT); 2678139046aSVaibhav Jain 268ec27329fSBenjamin Herrenschmidt for (;;) 269ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 27055190f88SBenjamin Herrenschmidt } 27155190f88SBenjamin Herrenschmidt 272ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_power_off(void) 27355190f88SBenjamin Herrenschmidt { 274ec27329fSBenjamin Herrenschmidt long rc = OPAL_BUSY; 275ec27329fSBenjamin Herrenschmidt 2762196c6f1SVasant Hegde pnv_prepare_going_down(); 277e8e71fa4SGavin Shan 278ec27329fSBenjamin Herrenschmidt while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 279ec27329fSBenjamin Herrenschmidt rc = opal_cec_power_down(0); 280ec27329fSBenjamin Herrenschmidt if (rc == OPAL_BUSY_EVENT) 281ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 282ec27329fSBenjamin Herrenschmidt else 283ec27329fSBenjamin Herrenschmidt mdelay(10); 284ec27329fSBenjamin Herrenschmidt } 285ec27329fSBenjamin Herrenschmidt for (;;) 286ec27329fSBenjamin Herrenschmidt opal_poll_events(NULL); 28755190f88SBenjamin Herrenschmidt } 28855190f88SBenjamin Herrenschmidt 289ec27329fSBenjamin Herrenschmidt static void __noreturn pnv_halt(void) 29055190f88SBenjamin Herrenschmidt { 291ec27329fSBenjamin Herrenschmidt pnv_power_off(); 29255190f88SBenjamin Herrenschmidt } 29355190f88SBenjamin Herrenschmidt 29455190f88SBenjamin Herrenschmidt static void pnv_progress(char *s, unsigned short hex) 29555190f88SBenjamin Herrenschmidt { 29655190f88SBenjamin Herrenschmidt } 29755190f88SBenjamin Herrenschmidt 29873ed148aSBenjamin Herrenschmidt static void pnv_shutdown(void) 29973ed148aSBenjamin Herrenschmidt { 30073ed148aSBenjamin Herrenschmidt /* Let the PCI code clear up IODA tables */ 30173ed148aSBenjamin Herrenschmidt pnv_pci_shutdown(); 30273ed148aSBenjamin Herrenschmidt 303f7d98d18SVasant Hegde /* 304f7d98d18SVasant Hegde * Stop OPAL activity: Unregister all OPAL interrupts so they 305f7d98d18SVasant Hegde * don't fire up while we kexec and make sure all potentially 306f7d98d18SVasant Hegde * DMA'ing ops are complete (such as dump retrieval). 30773ed148aSBenjamin Herrenschmidt */ 30873ed148aSBenjamin Herrenschmidt opal_shutdown(); 30973ed148aSBenjamin Herrenschmidt } 31073ed148aSBenjamin Herrenschmidt 311da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 312298b34d7SBenjamin Herrenschmidt static void pnv_kexec_wait_secondaries_down(void) 313298b34d7SBenjamin Herrenschmidt { 314298b34d7SBenjamin Herrenschmidt int my_cpu, i, notified = -1; 315298b34d7SBenjamin Herrenschmidt 316298b34d7SBenjamin Herrenschmidt my_cpu = get_cpu(); 317298b34d7SBenjamin Herrenschmidt 318298b34d7SBenjamin Herrenschmidt for_each_online_cpu(i) { 319298b34d7SBenjamin Herrenschmidt uint8_t status; 3201b70386cSSamuel Mendoza-Jonas int64_t rc, timeout = 1000; 321298b34d7SBenjamin Herrenschmidt 322298b34d7SBenjamin Herrenschmidt if (i == my_cpu) 323298b34d7SBenjamin Herrenschmidt continue; 324298b34d7SBenjamin Herrenschmidt 325298b34d7SBenjamin Herrenschmidt for (;;) { 326298b34d7SBenjamin Herrenschmidt rc = opal_query_cpu_status(get_hard_smp_processor_id(i), 327298b34d7SBenjamin Herrenschmidt &status); 328298b34d7SBenjamin Herrenschmidt if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED) 329298b34d7SBenjamin Herrenschmidt break; 330298b34d7SBenjamin Herrenschmidt barrier(); 331298b34d7SBenjamin Herrenschmidt if (i != notified) { 332298b34d7SBenjamin Herrenschmidt printk(KERN_INFO "kexec: waiting for cpu %d " 333298b34d7SBenjamin Herrenschmidt "(physical %d) to enter OPAL\n", 334d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 335298b34d7SBenjamin Herrenschmidt notified = i; 336298b34d7SBenjamin Herrenschmidt } 3371b70386cSSamuel Mendoza-Jonas 3381b70386cSSamuel Mendoza-Jonas /* 3391b70386cSSamuel Mendoza-Jonas * On crash secondaries might be unreachable or hung, 3401b70386cSSamuel Mendoza-Jonas * so timeout if we've waited too long 3411b70386cSSamuel Mendoza-Jonas * */ 3421b70386cSSamuel Mendoza-Jonas mdelay(1); 3431b70386cSSamuel Mendoza-Jonas if (timeout-- == 0) { 3441b70386cSSamuel Mendoza-Jonas printk(KERN_ERR "kexec: timed out waiting for " 3451b70386cSSamuel Mendoza-Jonas "cpu %d (physical %d) to enter OPAL\n", 346d2e60075SNicholas Piggin i, paca_ptrs[i]->hw_cpu_id); 3471b70386cSSamuel Mendoza-Jonas break; 3481b70386cSSamuel Mendoza-Jonas } 349298b34d7SBenjamin Herrenschmidt } 350298b34d7SBenjamin Herrenschmidt } 351298b34d7SBenjamin Herrenschmidt } 352298b34d7SBenjamin Herrenschmidt 35355190f88SBenjamin Herrenschmidt static void pnv_kexec_cpu_down(int crash_shutdown, int secondary) 35455190f88SBenjamin Herrenschmidt { 3551c0eaf0fSBenjamin Herrenschmidt u64 reinit_flags; 3561c0eaf0fSBenjamin Herrenschmidt 357243e2511SBenjamin Herrenschmidt if (xive_enabled()) 358e27e0a94SBenjamin Herrenschmidt xive_teardown_cpu(); 359243e2511SBenjamin Herrenschmidt else 36055190f88SBenjamin Herrenschmidt xics_kexec_teardown_cpu(secondary); 36113906db6SBenjamin Herrenschmidt 362e4d54f71SStewart Smith /* On OPAL, we return all CPUs to firmware */ 363e4d54f71SStewart Smith if (!firmware_has_feature(FW_FEATURE_OPAL)) 364298b34d7SBenjamin Herrenschmidt return; 365298b34d7SBenjamin Herrenschmidt 366298b34d7SBenjamin Herrenschmidt if (secondary) { 36713906db6SBenjamin Herrenschmidt /* Return secondary CPUs to firmware on OPAL v3 */ 36813906db6SBenjamin Herrenschmidt mb(); 36913906db6SBenjamin Herrenschmidt get_paca()->kexec_state = KEXEC_STATE_REAL_MODE; 37013906db6SBenjamin Herrenschmidt mb(); 37113906db6SBenjamin Herrenschmidt 37213906db6SBenjamin Herrenschmidt /* Return the CPU to OPAL */ 37313906db6SBenjamin Herrenschmidt opal_return_cpu(); 374298b34d7SBenjamin Herrenschmidt } else { 375298b34d7SBenjamin Herrenschmidt /* Primary waits for the secondaries to have reached OPAL */ 376298b34d7SBenjamin Herrenschmidt pnv_kexec_wait_secondaries_down(); 377e72bb8a5SSamuel Mendoza-Jonas 378243e2511SBenjamin Herrenschmidt /* Switch XIVE back to emulation mode */ 379243e2511SBenjamin Herrenschmidt if (xive_enabled()) 380243e2511SBenjamin Herrenschmidt xive_shutdown(); 381243e2511SBenjamin Herrenschmidt 382e72bb8a5SSamuel Mendoza-Jonas /* 383e72bb8a5SSamuel Mendoza-Jonas * We might be running as little-endian - now that interrupts 384e72bb8a5SSamuel Mendoza-Jonas * are disabled, reset the HILE bit to big-endian so we don't 385e72bb8a5SSamuel Mendoza-Jonas * take interrupts in the wrong endian later 3861c0eaf0fSBenjamin Herrenschmidt * 3871c0eaf0fSBenjamin Herrenschmidt * We reinit to enable both radix and hash on P9 to ensure 3881c0eaf0fSBenjamin Herrenschmidt * the mode used by the next kernel is always supported. 389e72bb8a5SSamuel Mendoza-Jonas */ 3901c0eaf0fSBenjamin Herrenschmidt reinit_flags = OPAL_REINIT_CPUS_HILE_BE; 3911c0eaf0fSBenjamin Herrenschmidt if (cpu_has_feature(CPU_FTR_ARCH_300)) 3921c0eaf0fSBenjamin Herrenschmidt reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX | 3931c0eaf0fSBenjamin Herrenschmidt OPAL_REINIT_CPUS_MMU_HASH; 3941c0eaf0fSBenjamin Herrenschmidt opal_reinit_cpus(reinit_flags); 39513906db6SBenjamin Herrenschmidt } 39655190f88SBenjamin Herrenschmidt } 397da665885SThiago Jung Bauermann #endif /* CONFIG_KEXEC_CORE */ 39855190f88SBenjamin Herrenschmidt 3996d97d7a2SAnton Blanchard #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 4006d97d7a2SAnton Blanchard static unsigned long pnv_memory_block_size(void) 4016d97d7a2SAnton Blanchard { 4026d97d7a2SAnton Blanchard return 256UL * 1024 * 1024; 4036d97d7a2SAnton Blanchard } 4046d97d7a2SAnton Blanchard #endif 4056d97d7a2SAnton Blanchard 406628daa8dSBenjamin Herrenschmidt static void __init pnv_setup_machdep_opal(void) 407628daa8dSBenjamin Herrenschmidt { 408628daa8dSBenjamin Herrenschmidt ppc_md.get_boot_time = opal_get_boot_time; 409628daa8dSBenjamin Herrenschmidt ppc_md.restart = pnv_restart; 4109178ba29SAlexander Graf pm_power_off = pnv_power_off; 411628daa8dSBenjamin Herrenschmidt ppc_md.halt = pnv_halt; 412e36d0a2eSNicholas Piggin /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */ 413ed79ba9eSBenjamin Herrenschmidt ppc_md.machine_check_exception = opal_machine_check; 41455672ecfSMahesh Salgaonkar ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; 415de269129SMahesh Salgaonkar if (opal_check_token(OPAL_HANDLE_HMI2)) 416de269129SMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early2; 417de269129SMahesh Salgaonkar else 4180869b6fdSMahesh Salgaonkar ppc_md.hmi_exception_early = opal_hmi_exception_early; 4190869b6fdSMahesh Salgaonkar ppc_md.handle_hmi_exception = opal_handle_hmi_exception; 420628daa8dSBenjamin Herrenschmidt } 421628daa8dSBenjamin Herrenschmidt 42255190f88SBenjamin Herrenschmidt static int __init pnv_probe(void) 42355190f88SBenjamin Herrenschmidt { 424406b0b6aSBenjamin Herrenschmidt if (!of_machine_is_compatible("ibm,powernv")) 42555190f88SBenjamin Herrenschmidt return 0; 42655190f88SBenjamin Herrenschmidt 427628daa8dSBenjamin Herrenschmidt if (firmware_has_feature(FW_FEATURE_OPAL)) 428628daa8dSBenjamin Herrenschmidt pnv_setup_machdep_opal(); 429628daa8dSBenjamin Herrenschmidt 43055190f88SBenjamin Herrenschmidt pr_debug("PowerNV detected !\n"); 43155190f88SBenjamin Herrenschmidt 432f2d57694SBenjamin Herrenschmidt pnv_init(); 433f2d57694SBenjamin Herrenschmidt 43455190f88SBenjamin Herrenschmidt return 1; 43555190f88SBenjamin Herrenschmidt } 43655190f88SBenjamin Herrenschmidt 43754820530SMichael Ellerman #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 43854820530SMichael Ellerman void __init pnv_tm_init(void) 43954820530SMichael Ellerman { 44054820530SMichael Ellerman if (!firmware_has_feature(FW_FEATURE_OPAL) || 44154820530SMichael Ellerman !pvr_version_is(PVR_POWER9) || 44254820530SMichael Ellerman early_cpu_has_feature(CPU_FTR_TM)) 44354820530SMichael Ellerman return; 44454820530SMichael Ellerman 44554820530SMichael Ellerman if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS) 44654820530SMichael Ellerman return; 44754820530SMichael Ellerman 44854820530SMichael Ellerman pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n"); 44954820530SMichael Ellerman cur_cpu_spec->cpu_features |= CPU_FTR_TM; 45054820530SMichael Ellerman /* Make sure "normal" HTM is off (it should be) */ 45154820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM; 45254820530SMichael Ellerman /* Turn on no suspend mode, and HTM no SC */ 45354820530SMichael Ellerman cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \ 45454820530SMichael Ellerman PPC_FEATURE2_HTM_NOSC; 45554820530SMichael Ellerman tm_suspend_disabled = true; 45654820530SMichael Ellerman } 45754820530SMichael Ellerman #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 45854820530SMichael Ellerman 459fb5153d0SGautham R. Shenoy /* 460fb5153d0SGautham R. Shenoy * Returns the cpu frequency for 'cpu' in Hz. This is used by 461fb5153d0SGautham R. Shenoy * /proc/cpuinfo 462fb5153d0SGautham R. Shenoy */ 463e51df2c1SAnton Blanchard static unsigned long pnv_get_proc_freq(unsigned int cpu) 464fb5153d0SGautham R. Shenoy { 465fb5153d0SGautham R. Shenoy unsigned long ret_freq; 466fb5153d0SGautham R. Shenoy 467cd77b5ceSShriya ret_freq = cpufreq_get(cpu) * 1000ul; 468fb5153d0SGautham R. Shenoy 469fb5153d0SGautham R. Shenoy /* 470fb5153d0SGautham R. Shenoy * If the backend cpufreq driver does not exist, 471fb5153d0SGautham R. Shenoy * then fallback to old way of reporting the clockrate. 472fb5153d0SGautham R. Shenoy */ 473fb5153d0SGautham R. Shenoy if (!ret_freq) 474fb5153d0SGautham R. Shenoy ret_freq = ppc_proc_freq; 475fb5153d0SGautham R. Shenoy return ret_freq; 476fb5153d0SGautham R. Shenoy } 477fb5153d0SGautham R. Shenoy 478a43c1590SMahesh Salgaonkar static long pnv_machine_check_early(struct pt_regs *regs) 479a43c1590SMahesh Salgaonkar { 480a43c1590SMahesh Salgaonkar long handled = 0; 481a43c1590SMahesh Salgaonkar 482a43c1590SMahesh Salgaonkar if (cur_cpu_spec && cur_cpu_spec->machine_check_early) 483a43c1590SMahesh Salgaonkar handled = cur_cpu_spec->machine_check_early(regs); 484a43c1590SMahesh Salgaonkar 485a43c1590SMahesh Salgaonkar return handled; 486a43c1590SMahesh Salgaonkar } 487a43c1590SMahesh Salgaonkar 48855190f88SBenjamin Herrenschmidt define_machine(powernv) { 48955190f88SBenjamin Herrenschmidt .name = "PowerNV", 49055190f88SBenjamin Herrenschmidt .probe = pnv_probe, 491628daa8dSBenjamin Herrenschmidt .setup_arch = pnv_setup_arch, 49255190f88SBenjamin Herrenschmidt .init_IRQ = pnv_init_IRQ, 49355190f88SBenjamin Herrenschmidt .show_cpuinfo = pnv_show_cpuinfo, 494fb5153d0SGautham R. Shenoy .get_proc_freq = pnv_get_proc_freq, 49555190f88SBenjamin Herrenschmidt .progress = pnv_progress, 49673ed148aSBenjamin Herrenschmidt .machine_shutdown = pnv_shutdown, 4975593e303SShreyas B. Prabhu .power_save = NULL, 49855190f88SBenjamin Herrenschmidt .calibrate_decr = generic_calibrate_decr, 499a43c1590SMahesh Salgaonkar .machine_check_early = pnv_machine_check_early, 500da665885SThiago Jung Bauermann #ifdef CONFIG_KEXEC_CORE 50155190f88SBenjamin Herrenschmidt .kexec_cpu_down = pnv_kexec_cpu_down, 50255190f88SBenjamin Herrenschmidt #endif 5036d97d7a2SAnton Blanchard #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE 5046d97d7a2SAnton Blanchard .memory_block_size = pnv_memory_block_size, 5056d97d7a2SAnton Blanchard #endif 50655190f88SBenjamin Herrenschmidt }; 507