/* * 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 "plpar_wrappers.h" #include "pseries.h" int CMO_PrPSP = -1; int CMO_SecPSP = -1; unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT); EXPORT_SYMBOL(CMO_PageSize); int fwnmi_active; /* TRUE if an FWNMI handler is present */ static void pseries_shared_idle_sleep(void); static void pseries_dedicated_idle_sleep(void); static struct device_node *pSeries_mpic_node; 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); } /* 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(unsigned int irq, struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); unsigned int cascade_irq = i8259_irq(); if (cascade_irq != NO_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 == NO_IRQ) { 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_mpic_init_IRQ(void) { struct device_node *np; const unsigned int *opprop; unsigned long openpic_addr = 0; int naddr, n, i, opplen; struct mpic *mpic; np = of_find_node_by_path("/"); naddr = of_n_addr_cells(np); opprop = of_get_property(np, "platform-open-pic", &opplen); if (opprop != 0) { openpic_addr = of_read_number(opprop, naddr); printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr); } of_node_put(np); BUG_ON(openpic_addr == 0); /* Setup the openpic driver */ mpic = mpic_alloc(pSeries_mpic_node, openpic_addr, MPIC_PRIMARY, 16, 250, /* isu size, irq count */ " MPIC "); BUG_ON(mpic == NULL); /* Add ISUs */ opplen /= sizeof(u32); for (n = 0, i = naddr; i < opplen; i += naddr, n++) { unsigned long isuaddr = of_read_number(opprop + i, naddr); mpic_assign_isu(mpic, n, isuaddr); } /* Setup top-level get_irq */ ppc_md.get_irq = mpic_get_irq; /* All ISUs are setup, complete initialization */ mpic_init(mpic); /* Look for cascade */ pseries_setup_i8259_cascade(); } static void __init pseries_xics_init_IRQ(void) { 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 void __init pseries_discover_pic(void) { struct device_node *np; const char *typep; for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) { typep = of_get_property(np, "compatible", NULL); if (strstr(typep, "open-pic")) { pSeries_mpic_node = of_node_get(np); ppc_md.init_IRQ = pseries_mpic_init_IRQ; setup_kexec_cpu_down_mpic(); smp_init_pseries_mpic(); return; } else if (strstr(typep, "ppc-xicp")) { ppc_md.init_IRQ = pseries_xics_init_IRQ; setup_kexec_cpu_down_xics(); smp_init_pseries_xics(); return; } } printk(KERN_ERR "pSeries_discover_pic: failed to recognize" " interrupt-controller\n"); } static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) { struct device_node *np = node; struct pci_dn *pci = NULL; int err = NOTIFY_OK; switch (action) { case PSERIES_RECONFIG_ADD: pci = np->parent->data; if (pci) update_dn_pci_info(np, pci->phb); break; default: err = NOTIFY_DONE; break; } return err; } static struct notifier_block pci_dn_reconfig_nb = { .notifier_call = pci_dn_reconfig_notifier, }; #ifdef CONFIG_VIRT_CPU_ACCOUNTING /* * 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; struct kmem_cache *dtl_cache; if (!firmware_has_feature(FW_FEATURE_SPLPAR)) return 0; 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; } 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 = DISPATCH_LOG_BYTES; ret = register_dtl(hard_smp_processor_id(), __pa(dtl)); if (ret) pr_warn("DTL registration failed for boot cpu %d (%d)\n", smp_processor_id(), ret); get_paca()->lppaca_ptr->dtl_enable_mask = 2; return 0; } early_initcall(alloc_dispatch_logs); #endif /* CONFIG_VIRT_CPU_ACCOUNTING */ static void __init pSeries_setup_arch(void) { /* Discover PIC type and setup ppc_md accordingly */ pseries_discover_pic(); /* 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(); /* Find and initialize PCI host bridges */ init_pci_config_tokens(); find_and_init_phbs(); pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb); eeh_init(); pSeries_nvram_init(); /* Choose an idle loop */ if (firmware_has_feature(FW_FEATURE_SPLPAR)) { vpa_init(boot_cpuid); if (get_lppaca()->shared_proc) { printk(KERN_DEBUG "Using shared processor idle loop\n"); ppc_md.power_save = pseries_shared_idle_sleep; } else { printk(KERN_DEBUG "Using dedicated idle loop\n"); ppc_md.power_save = pseries_dedicated_idle_sleep; } } else { printk(KERN_DEBUG "Using default idle loop\n"); } if (firmware_has_feature(FW_FEATURE_LPAR)) ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; else ppc_md.enable_pmcs = power4_enable_pmcs; } static int __init pSeries_init_panel(void) { /* Manually leave the kernel version on the panel. */ ppc_md.progress("Linux ppc64\n", 0); ppc_md.progress(init_utsname()->version, 0); return 0; } machine_arch_initcall(pseries, pSeries_init_panel); static int pseries_set_dabr(unsigned long dabr) { return plpar_hcall_norets(H_SET_DABR, dabr); } static int pseries_set_xdabr(unsigned long dabr) { /* We want to catch accesses from kernel and userspace */ return plpar_hcall_norets(H_SET_XDABR, dabr, H_DABRX_KERNEL | H_DABRX_USER); } #define CMO_CHARACTERISTICS_TOKEN 44 #define CMO_MAXLENGTH 1026 /** * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions, * handle that here. (Stolen from parse_system_parameter_string) */ void pSeries_cmo_feature_init(void) { char *ptr, *key, *value, *end; int call_status; int page_order = IOMMU_PAGE_SHIFT; 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; } 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_early(void) { pr_debug(" -> pSeries_init_early()\n"); if (firmware_has_feature(FW_FEATURE_LPAR)) find_udbg_vterm(); if (firmware_has_feature(FW_FEATURE_DABR)) ppc_md.set_dabr = pseries_set_dabr; else if (firmware_has_feature(FW_FEATURE_XDABR)) ppc_md.set_dabr = pseries_set_xdabr; pSeries_cmo_feature_init(); iommu_init_early_pSeries(); pr_debug(" <- pSeries_init_early()\n"); } /* * Called very early, MMU is off, device-tree isn't unflattened */ static int __init pSeries_probe_hypertas(unsigned long node, const char *uname, int depth, void *data) { const char *hypertas; unsigned long len; if (depth != 1 || (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0)) return 0; hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len); if (!hypertas) return 1; powerpc_firmware_features |= FW_FEATURE_LPAR; fw_feature_init(hypertas, len); return 1; } static int __init pSeries_probe(void) { unsigned long root = of_get_flat_dt_root(); char *dtype = of_get_flat_dt_prop(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_flat_dt_is_compatible(root, "IBM,CPBW-1.0") || of_flat_dt_is_compatible(root, "IBM,CBEA")) return 0; pr_debug("pSeries detected, looking for LPAR capability...\n"); /* Now try to figure out if we are running on LPAR */ of_scan_flat_dt(pSeries_probe_hypertas, NULL); if (firmware_has_feature(FW_FEATURE_LPAR)) hpte_init_lpar(); else hpte_init_native(); pr_debug("Machine is%s LPAR !\n", (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not"); return 1; } DECLARE_PER_CPU(long, smt_snooze_delay); static void pseries_dedicated_idle_sleep(void) { unsigned int cpu = smp_processor_id(); unsigned long start_snooze; unsigned long in_purr, out_purr; long snooze = __get_cpu_var(smt_snooze_delay); /* * Indicate to the HV that we are idle. Now would be * a good time to find other work to dispatch. */ get_lppaca()->idle = 1; get_lppaca()->donate_dedicated_cpu = 1; in_purr = mfspr(SPRN_PURR); /* * We come in with interrupts disabled, and need_resched() * has been checked recently. If we should poll for a little * while, do so. */ if (snooze) { start_snooze = get_tb() + snooze * tb_ticks_per_usec; local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); while ((snooze < 0) || (get_tb() < start_snooze)) { if (need_resched() || cpu_is_offline(cpu)) goto out; ppc64_runlatch_off(); HMT_low(); HMT_very_low(); } HMT_medium(); clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb(); local_irq_disable(); if (need_resched() || cpu_is_offline(cpu)) goto out; } cede_processor(); out: HMT_medium(); out_purr = mfspr(SPRN_PURR); get_lppaca()->wait_state_cycles += out_purr - in_purr; get_lppaca()->donate_dedicated_cpu = 0; get_lppaca()->idle = 0; } static void pseries_shared_idle_sleep(void) { /* * Indicate to the HV that we are idle. Now would be * a good time to find other work to dispatch. */ 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; } 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; } /** * 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 (;;); } #ifndef CONFIG_PCI void pSeries_final_fixup(void) { } #endif define_machine(pseries) { .name = "pSeries", .probe = pSeries_probe, .setup_arch = pSeries_setup_arch, .init_early = pSeries_init_early, .show_cpuinfo = pSeries_show_cpuinfo, .log_error = pSeries_log_error, .pcibios_fixup = pSeries_final_fixup, .pci_probe_mode = pSeries_pci_probe_mode, .restart = rtas_restart, .power_off = pSeries_power_off, .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, };