/* * 64-bit pSeries and RS/6000 setup code. * * Copyright (C) 1995 Linus Torvalds * Adapted from 'alpha' version by Gary Thomas * Modified by Cort Dougan (cort@cs.nmt.edu) * Modified by PPC64 Team, IBM Corp * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ /* * bootup setup stuff.. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pseries.h" int CMO_PrPSP = -1; int CMO_SecPSP = -1; unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K); EXPORT_SYMBOL(CMO_PageSize); int fwnmi_active; /* TRUE if an FWNMI handler is present */ static void pSeries_show_cpuinfo(struct seq_file *m) { struct device_node *root; const char *model = ""; root = of_find_node_by_path("/"); if (root) model = of_get_property(root, "model", NULL); seq_printf(m, "machine\t\t: CHRP %s\n", model); of_node_put(root); if (radix_enabled()) seq_printf(m, "MMU\t\t: Radix\n"); else seq_printf(m, "MMU\t\t: Hash\n"); } /* Initialize firmware assisted non-maskable interrupts if * the firmware supports this feature. */ static void __init fwnmi_init(void) { unsigned long system_reset_addr, machine_check_addr; int ibm_nmi_register = rtas_token("ibm,nmi-register"); if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE) return; /* If the kernel's not linked at zero we point the firmware at low * addresses anyway, and use a trampoline to get to the real code. */ system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START; machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START; if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr, machine_check_addr)) fwnmi_active = 1; } static void pseries_8259_cascade(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); unsigned int cascade_irq = i8259_irq(); if (cascade_irq) generic_handle_irq(cascade_irq); chip->irq_eoi(&desc->irq_data); } static void __init pseries_setup_i8259_cascade(void) { struct device_node *np, *old, *found = NULL; unsigned int cascade; const u32 *addrp; unsigned long intack = 0; int naddr; for_each_node_by_type(np, "interrupt-controller") { if (of_device_is_compatible(np, "chrp,iic")) { found = np; break; } } if (found == NULL) { printk(KERN_DEBUG "pic: no ISA interrupt controller\n"); return; } cascade = irq_of_parse_and_map(found, 0); if (!cascade) { printk(KERN_ERR "pic: failed to map cascade interrupt"); return; } pr_debug("pic: cascade mapped to irq %d\n", cascade); for (old = of_node_get(found); old != NULL ; old = np) { np = of_get_parent(old); of_node_put(old); if (np == NULL) break; if (strcmp(np->name, "pci") != 0) continue; addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); if (addrp == NULL) continue; naddr = of_n_addr_cells(np); intack = addrp[naddr-1]; if (naddr > 1) intack |= ((unsigned long)addrp[naddr-2]) << 32; } if (intack) printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack); i8259_init(found, intack); of_node_put(found); irq_set_chained_handler(cascade, pseries_8259_cascade); } static void __init pseries_init_irq(void) { /* Try using a XIVE if available, otherwise use a XICS */ if (!xive_spapr_init()) { xics_init(); pseries_setup_i8259_cascade(); } } static void pseries_lpar_enable_pmcs(void) { unsigned long set, reset; set = 1UL << 63; reset = 0; plpar_hcall_norets(H_PERFMON, set, reset); } static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct of_reconfig_data *rd = data; struct device_node *parent, *np = rd->dn; struct pci_dn *pdn; int err = NOTIFY_OK; switch (action) { case OF_RECONFIG_ATTACH_NODE: parent = of_get_parent(np); pdn = parent ? PCI_DN(parent) : NULL; if (pdn) pci_add_device_node_info(pdn->phb, np); of_node_put(parent); break; case OF_RECONFIG_DETACH_NODE: pdn = PCI_DN(np); if (pdn) list_del(&pdn->list); break; default: err = NOTIFY_DONE; break; } return err; } static struct notifier_block pci_dn_reconfig_nb = { .notifier_call = pci_dn_reconfig_notifier, }; struct kmem_cache *dtl_cache; #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE /* * Allocate space for the dispatch trace log for all possible cpus * and register the buffers with the hypervisor. This is used for * computing time stolen by the hypervisor. */ static int alloc_dispatch_logs(void) { int cpu, ret; struct paca_struct *pp; struct dtl_entry *dtl; if (!firmware_has_feature(FW_FEATURE_SPLPAR)) return 0; if (!dtl_cache) return 0; for_each_possible_cpu(cpu) { pp = &paca[cpu]; dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL); if (!dtl) { pr_warn("Failed to allocate dispatch trace log for cpu %d\n", cpu); pr_warn("Stolen time statistics will be unreliable\n"); break; } pp->dtl_ridx = 0; pp->dispatch_log = dtl; pp->dispatch_log_end = dtl + N_DISPATCH_LOG; pp->dtl_curr = dtl; } /* Register the DTL for the current (boot) cpu */ dtl = get_paca()->dispatch_log; get_paca()->dtl_ridx = 0; get_paca()->dtl_curr = dtl; get_paca()->lppaca_ptr->dtl_idx = 0; /* hypervisor reads buffer length from this field */ dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES); ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); if (ret) pr_err("WARNING: DTL registration of cpu %d (hw %d) failed " "with %d\n", smp_processor_id(), hard_smp_processor_id(), ret); get_paca()->lppaca_ptr->dtl_enable_mask = 2; return 0; } #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ static inline int alloc_dispatch_logs(void) { return 0; } #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ static int alloc_dispatch_log_kmem_cache(void) { dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES, DISPATCH_LOG_BYTES, 0, NULL); if (!dtl_cache) { pr_warn("Failed to create dispatch trace log buffer cache\n"); pr_warn("Stolen time statistics will be unreliable\n"); return 0; } return alloc_dispatch_logs(); } machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache); static void pseries_lpar_idle(void) { /* * Default handler to go into low thread priority and possibly * low power mode by ceding processor to hypervisor */ /* Indicate to hypervisor that we are idle. */ get_lppaca()->idle = 1; /* * Yield the processor to the hypervisor. We return if * an external interrupt occurs (which are driven prior * to returning here) or if a prod occurs from another * processor. When returning here, external interrupts * are enabled. */ cede_processor(); get_lppaca()->idle = 0; } /* * Enable relocation on during exceptions. This has partition wide scope and * may take a while to complete, if it takes longer than one second we will * just give up rather than wasting any more time on this - if that turns out * to ever be a problem in practice we can move this into a kernel thread to * finish off the process later in boot. */ void pseries_enable_reloc_on_exc(void) { long rc; unsigned int delay, total_delay = 0; while (1) { rc = enable_reloc_on_exceptions(); if (!H_IS_LONG_BUSY(rc)) { if (rc == H_P2) { pr_info("Relocation on exceptions not" " supported\n"); } else if (rc != H_SUCCESS) { pr_warn("Unable to enable relocation" " on exceptions: %ld\n", rc); } break; } delay = get_longbusy_msecs(rc); total_delay += delay; if (total_delay > 1000) { pr_warn("Warning: Giving up waiting to enable " "relocation on exceptions (%u msec)!\n", total_delay); return; } mdelay(delay); } } EXPORT_SYMBOL(pseries_enable_reloc_on_exc); void pseries_disable_reloc_on_exc(void) { long rc; while (1) { rc = disable_reloc_on_exceptions(); if (!H_IS_LONG_BUSY(rc)) break; mdelay(get_longbusy_msecs(rc)); } if (rc != H_SUCCESS) pr_warning("Warning: Failed to disable relocation on " "exceptions: %ld\n", rc); } EXPORT_SYMBOL(pseries_disable_reloc_on_exc); #ifdef CONFIG_KEXEC_CORE static void pSeries_machine_kexec(struct kimage *image) { if (firmware_has_feature(FW_FEATURE_SET_MODE)) pseries_disable_reloc_on_exc(); default_machine_kexec(image); } #endif #ifdef __LITTLE_ENDIAN__ void pseries_big_endian_exceptions(void) { long rc; while (1) { rc = enable_big_endian_exceptions(); if (!H_IS_LONG_BUSY(rc)) break; mdelay(get_longbusy_msecs(rc)); } /* * At this point it is unlikely panic() will get anything * out to the user, since this is called very late in kexec * but at least this will stop us from continuing on further * and creating an even more difficult to debug situation. * * There is a known problem when kdump'ing, if cpus are offline * the above call will fail. Rather than panicking again, keep * going and hope the kdump kernel is also little endian, which * it usually is. */ if (rc && !kdump_in_progress()) panic("Could not enable big endian exceptions"); } void pseries_little_endian_exceptions(void) { long rc; while (1) { rc = enable_little_endian_exceptions(); if (!H_IS_LONG_BUSY(rc)) break; mdelay(get_longbusy_msecs(rc)); } if (rc) { ppc_md.progress("H_SET_MODE LE exception fail", 0); panic("Could not enable little endian exceptions"); } } #endif static void __init find_and_init_phbs(void) { struct device_node *node; struct pci_controller *phb; struct device_node *root = of_find_node_by_path("/"); for_each_child_of_node(root, node) { if (node->type == NULL || (strcmp(node->type, "pci") != 0 && strcmp(node->type, "pciex") != 0)) continue; phb = pcibios_alloc_controller(node); if (!phb) continue; rtas_setup_phb(phb); pci_process_bridge_OF_ranges(phb, node, 0); isa_bridge_find_early(phb); phb->controller_ops = pseries_pci_controller_ops; } of_node_put(root); /* * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties * in chosen. */ of_pci_check_probe_only(); } static void __init pSeries_setup_arch(void) { set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT); /* Discover PIC type and setup ppc_md accordingly */ smp_init_pseries(); /* openpic global configuration register (64-bit format). */ /* openpic Interrupt Source Unit pointer (64-bit format). */ /* python0 facility area (mmio) (64-bit format) REAL address. */ /* init to some ~sane value until calibrate_delay() runs */ loops_per_jiffy = 50000000; fwnmi_init(); /* By default, only probe PCI (can be overridden by rtas_pci) */ pci_add_flags(PCI_PROBE_ONLY); /* Find and initialize PCI host bridges */ init_pci_config_tokens(); find_and_init_phbs(); of_reconfig_notifier_register(&pci_dn_reconfig_nb); pSeries_nvram_init(); if (firmware_has_feature(FW_FEATURE_LPAR)) { vpa_init(boot_cpuid); ppc_md.power_save = pseries_lpar_idle; ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; } else { /* No special idle routine */ ppc_md.enable_pmcs = power4_enable_pmcs; } ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; } static int __init pSeries_init_panel(void) { /* Manually leave the kernel version on the panel. */ #ifdef __BIG_ENDIAN__ ppc_md.progress("Linux ppc64\n", 0); #else ppc_md.progress("Linux ppc64le\n", 0); #endif ppc_md.progress(init_utsname()->version, 0); return 0; } machine_arch_initcall(pseries, pSeries_init_panel); static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx) { return plpar_hcall_norets(H_SET_DABR, dabr); } static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx) { /* Have to set at least one bit in the DABRX according to PAPR */ if (dabrx == 0 && dabr == 0) dabrx = DABRX_USER; /* PAPR says we can only set kernel and user bits */ dabrx &= DABRX_KERNEL | DABRX_USER; return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx); } static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx) { /* PAPR says we can't set HYP */ dawrx &= ~DAWRX_HYP; return plapr_set_watchpoint0(dawr, dawrx); } #define CMO_CHARACTERISTICS_TOKEN 44 #define CMO_MAXLENGTH 1026 void pSeries_coalesce_init(void) { struct hvcall_mpp_x_data mpp_x_data; if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data)) powerpc_firmware_features |= FW_FEATURE_XCMO; else powerpc_firmware_features &= ~FW_FEATURE_XCMO; } /** * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, * handle that here. (Stolen from parse_system_parameter_string) */ static void pSeries_cmo_feature_init(void) { char *ptr, *key, *value, *end; int call_status; int page_order = IOMMU_PAGE_SHIFT_4K; pr_debug(" -> fw_cmo_feature_init()\n"); spin_lock(&rtas_data_buf_lock); memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE); call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, NULL, CMO_CHARACTERISTICS_TOKEN, __pa(rtas_data_buf), RTAS_DATA_BUF_SIZE); if (call_status != 0) { spin_unlock(&rtas_data_buf_lock); pr_debug("CMO not available\n"); pr_debug(" <- fw_cmo_feature_init()\n"); return; } end = rtas_data_buf + CMO_MAXLENGTH - 2; ptr = rtas_data_buf + 2; /* step over strlen value */ key = value = ptr; while (*ptr && (ptr <= end)) { /* Separate the key and value by replacing '=' with '\0' and * point the value at the string after the '=' */ if (ptr[0] == '=') { ptr[0] = '\0'; value = ptr + 1; } else if (ptr[0] == '\0' || ptr[0] == ',') { /* Terminate the string containing the key/value pair */ ptr[0] = '\0'; if (key == value) { pr_debug("Malformed key/value pair\n"); /* Never found a '=', end processing */ break; } if (0 == strcmp(key, "CMOPageSize")) page_order = simple_strtol(value, NULL, 10); else if (0 == strcmp(key, "PrPSP")) CMO_PrPSP = simple_strtol(value, NULL, 10); else if (0 == strcmp(key, "SecPSP")) CMO_SecPSP = simple_strtol(value, NULL, 10); value = key = ptr + 1; } ptr++; } /* Page size is returned as the power of 2 of the page size, * convert to the page size in bytes before returning */ CMO_PageSize = 1 << page_order; pr_debug("CMO_PageSize = %lu\n", CMO_PageSize); if (CMO_PrPSP != -1 || CMO_SecPSP != -1) { pr_info("CMO enabled\n"); pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, CMO_SecPSP); powerpc_firmware_features |= FW_FEATURE_CMO; pSeries_coalesce_init(); } else pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP, CMO_SecPSP); spin_unlock(&rtas_data_buf_lock); pr_debug(" <- fw_cmo_feature_init()\n"); } /* * Early initialization. Relocation is on but do not reference unbolted pages */ static void __init pseries_init(void) { pr_debug(" -> pseries_init()\n"); #ifdef CONFIG_HVC_CONSOLE if (firmware_has_feature(FW_FEATURE_LPAR)) hvc_vio_init_early(); #endif if (firmware_has_feature(FW_FEATURE_XDABR)) ppc_md.set_dabr = pseries_set_xdabr; else if (firmware_has_feature(FW_FEATURE_DABR)) ppc_md.set_dabr = pseries_set_dabr; if (firmware_has_feature(FW_FEATURE_SET_MODE)) ppc_md.set_dawr = pseries_set_dawr; pSeries_cmo_feature_init(); iommu_init_early_pSeries(); pr_debug(" <- pseries_init()\n"); } /** * pseries_power_off - tell firmware about how to power off the system. * * This function calls either the power-off rtas token in normal cases * or the ibm,power-off-ups token (if present & requested) in case of * a power failure. If power-off token is used, power on will only be * possible with power button press. If ibm,power-off-ups token is used * it will allow auto poweron after power is restored. */ static void pseries_power_off(void) { int rc; int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups"); if (rtas_flash_term_hook) rtas_flash_term_hook(SYS_POWER_OFF); if (rtas_poweron_auto == 0 || rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) { rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1); printk(KERN_INFO "RTAS power-off returned %d\n", rc); } else { rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL); printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc); } for (;;); } static int __init pSeries_probe(void) { const char *dtype = of_get_property(of_root, "device_type", NULL); if (dtype == NULL) return 0; if (strcmp(dtype, "chrp")) return 0; /* Cell blades firmware claims to be chrp while it's not. Until this * is fixed, we need to avoid those here. */ if (of_machine_is_compatible("IBM,CPBW-1.0") || of_machine_is_compatible("IBM,CBEA")) return 0; pm_power_off = pseries_power_off; pr_debug("Machine is%s LPAR !\n", (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); pseries_init(); return 1; } static int pSeries_pci_probe_mode(struct pci_bus *bus) { if (firmware_has_feature(FW_FEATURE_LPAR)) return PCI_PROBE_DEVTREE; return PCI_PROBE_NORMAL; } struct pci_controller_ops pseries_pci_controller_ops = { .probe_mode = pSeries_pci_probe_mode, }; define_machine(pseries) { .name = "pSeries", .probe = pSeries_probe, .setup_arch = pSeries_setup_arch, .init_IRQ = pseries_init_irq, .show_cpuinfo = pSeries_show_cpuinfo, .log_error = pSeries_log_error, .pcibios_fixup = pSeries_final_fixup, .restart = rtas_restart, .halt = rtas_halt, .panic = rtas_os_term, .get_boot_time = rtas_get_boot_time, .get_rtc_time = rtas_get_rtc_time, .set_rtc_time = rtas_set_rtc_time, .calibrate_decr = generic_calibrate_decr, .progress = rtas_progress, .system_reset_exception = pSeries_system_reset_exception, .machine_check_exception = pSeries_machine_check_exception, #ifdef CONFIG_KEXEC_CORE .machine_kexec = pSeries_machine_kexec, .kexec_cpu_down = pseries_kexec_cpu_down, #endif #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE .memory_block_size = pseries_memory_block_size, #endif };