diff options
Diffstat (limited to 'arch/powerpc/kernel/setup-common.c')
| -rw-r--r-- | arch/powerpc/kernel/setup-common.c | 677 |
1 files changed, 474 insertions, 203 deletions
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index 63d051f5b7a5..c8c42b419742 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -1,18 +1,15 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * Common boot and setup code for both 32-bit and 64-bit. * Extracted from arch/powerpc/kernel/setup_64.c. * * Copyright (C) 2001 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. */ #undef DEBUG #include <linux/export.h> +#include <linux/panic_notifier.h> #include <linux/string.h> #include <linux/sched.h> #include <linux/init.h> @@ -21,26 +18,28 @@ #include <linux/delay.h> #include <linux/initrd.h> #include <linux/platform_device.h> +#include <linux/printk.h> #include <linux/seq_file.h> #include <linux/ioport.h> #include <linux/console.h> -#include <linux/screen_info.h> #include <linux/root_dev.h> -#include <linux/notifier.h> #include <linux/cpu.h> #include <linux/unistd.h> +#include <linux/seq_buf.h> #include <linux/serial.h> #include <linux/serial_8250.h> -#include <linux/debugfs.h> #include <linux/percpu.h> #include <linux/memblock.h> -#include <linux/of_platform.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/of_irq.h> +#include <linux/hugetlb.h> +#include <linux/pgtable.h> +#include <asm/kexec.h> #include <asm/io.h> #include <asm/paca.h> -#include <asm/prom.h> #include <asm/processor.h> #include <asm/vdso_datapage.h> -#include <asm/pgtable.h> #include <asm/smp.h> #include <asm/elf.h> #include <asm/machdep.h> @@ -60,12 +59,20 @@ #include <asm/xmon.h> #include <asm/cputhreads.h> #include <mm/mmu_decl.h> +#include <asm/archrandom.h> #include <asm/fadump.h> +#include <asm/udbg.h> +#include <asm/hugetlb.h> +#include <asm/livepatch.h> +#include <asm/mmu_context.h> +#include <asm/cpu_has_feature.h> +#include <asm/kasan.h> +#include <asm/mce.h> +#include <asm/systemcfg.h> #include "setup.h" #ifdef DEBUG -#include <asm/udbg.h> #define DBG(fmt...) udbg_printf(fmt) #else #define DBG(fmt...) @@ -78,21 +85,20 @@ EXPORT_SYMBOL(ppc_md); struct machdep_calls *machine_id; EXPORT_SYMBOL(machine_id); -unsigned long klimit = (unsigned long) _end; +int boot_cpuid = -1; +EXPORT_SYMBOL_GPL(boot_cpuid); +int __initdata boot_core_hwid = -1; -char cmd_line[COMMAND_LINE_SIZE]; +#ifdef CONFIG_PPC64 +int boot_cpu_hwid = -1; +#endif /* - * This still seems to be needed... -- paulus - */ -struct screen_info screen_info = { - .orig_x = 0, - .orig_y = 25, - .orig_video_cols = 80, - .orig_video_lines = 25, - .orig_video_isVGA = 1, - .orig_video_points = 16 -}; + * These are used in binfmt_elf.c to put aux entries on the stack + * for each elf executable being started. + */ +int dcache_bsize; +int icache_bsize; /* Variables required to store legacy IO irq routing */ int of_i8042_kbd_irq; @@ -106,71 +112,77 @@ int ppc_do_canonicalize_irqs; EXPORT_SYMBOL(ppc_do_canonicalize_irqs); #endif +#ifdef CONFIG_CRASH_DUMP +/* This keeps a track of which one is the crashing cpu. */ +int crashing_cpu = -1; +#endif + /* also used by kexec */ void machine_shutdown(void) { -#ifdef CONFIG_FA_DUMP /* * if fadump is active, cleanup the fadump registration before we * shutdown. */ fadump_cleanup(); -#endif if (ppc_md.machine_shutdown) ppc_md.machine_shutdown(); } +static void machine_hang(void) +{ + pr_emerg("System Halted, OK to turn off power\n"); + local_irq_disable(); + while (1) + ; +} + void machine_restart(char *cmd) { machine_shutdown(); if (ppc_md.restart) ppc_md.restart(cmd); -#ifdef CONFIG_SMP + smp_send_stop(); -#endif - printk(KERN_EMERG "System Halted, OK to turn off power\n"); - local_irq_disable(); - while (1) ; + + do_kernel_restart(cmd); + mdelay(1000); + + machine_hang(); } void machine_power_off(void) { machine_shutdown(); - if (ppc_md.power_off) - ppc_md.power_off(); -#ifdef CONFIG_SMP + do_kernel_power_off(); smp_send_stop(); -#endif - printk(KERN_EMERG "System Halted, OK to turn off power\n"); - local_irq_disable(); - while (1) ; + machine_hang(); } /* Used by the G5 thermal driver */ EXPORT_SYMBOL_GPL(machine_power_off); -void (*pm_power_off)(void) = machine_power_off; +void (*pm_power_off)(void); EXPORT_SYMBOL_GPL(pm_power_off); +size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs) +{ + if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v)) + return 1; + return 0; +} +EXPORT_SYMBOL(arch_get_random_seed_longs); + void machine_halt(void) { machine_shutdown(); if (ppc_md.halt) ppc_md.halt(); -#ifdef CONFIG_SMP + smp_send_stop(); -#endif - printk(KERN_EMERG "System Halted, OK to turn off power\n"); - local_irq_disable(); - while (1) ; + machine_hang(); } - -#ifdef CONFIG_TAU -extern u32 cpu_temp(unsigned long cpu); -extern u32 cpu_temp_both(unsigned long cpu); -#endif /* CONFIG_TAU */ - #ifdef CONFIG_SMP DEFINE_PER_CPU(unsigned int, cpu_pvr); #endif @@ -179,14 +191,15 @@ static void show_cpuinfo_summary(struct seq_file *m) { struct device_node *root; const char *model = NULL; -#if defined(CONFIG_SMP) && defined(CONFIG_PPC32) unsigned long bogosum = 0; int i; - for_each_online_cpu(i) - bogosum += loops_per_jiffy; - seq_printf(m, "total bogomips\t: %lu.%02lu\n", - bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); -#endif /* CONFIG_SMP && CONFIG_PPC32 */ + + if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { + for_each_online_cpu(i) + bogosum += loops_per_jiffy; + seq_printf(m, "total bogomips\t: %lu.%02lu\n", + bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); + } seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); if (ppc_md.name) seq_printf(m, "platform\t: %s\n", ppc_md.name); @@ -200,28 +213,20 @@ static void show_cpuinfo_summary(struct seq_file *m) if (ppc_md.show_cpuinfo != NULL) ppc_md.show_cpuinfo(m); -#ifdef CONFIG_PPC32 /* Display the amount of memory */ - seq_printf(m, "Memory\t\t: %d MB\n", - (unsigned int)(total_memory / (1024 * 1024))); -#endif + if (IS_ENABLED(CONFIG_PPC32)) + seq_printf(m, "Memory\t\t: %d MB\n", + (unsigned int)(total_memory / (1024 * 1024))); } static int show_cpuinfo(struct seq_file *m, void *v) { unsigned long cpu_id = (unsigned long)v - 1; unsigned int pvr; + unsigned long proc_freq; unsigned short maj; unsigned short min; - /* We only show online cpus: disable preempt (overzealous, I - * knew) to prevent cpu going down. */ - preempt_disable(); - if (!cpu_online(cpu_id)) { - preempt_enable(); - return 0; - } - #ifdef CONFIG_SMP pvr = per_cpu(cpu_pvr, cpu_id); #else @@ -230,50 +235,51 @@ static int show_cpuinfo(struct seq_file *m, void *v) maj = (pvr >> 8) & 0xFF; min = pvr & 0xFF; - seq_printf(m, "processor\t: %lu\n", cpu_id); - seq_printf(m, "cpu\t\t: "); + seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id); - if (cur_cpu_spec->pvr_mask) - seq_printf(m, "%s", cur_cpu_spec->cpu_name); + if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) + seq_puts(m, cur_cpu_spec->cpu_name); else seq_printf(m, "unknown (%08x)", pvr); -#ifdef CONFIG_ALTIVEC if (cpu_has_feature(CPU_FTR_ALTIVEC)) - seq_printf(m, ", altivec supported"); -#endif /* CONFIG_ALTIVEC */ + seq_puts(m, ", altivec supported"); - seq_printf(m, "\n"); + seq_putc(m, '\n'); #ifdef CONFIG_TAU - if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { -#ifdef CONFIG_TAU_AVERAGE - /* more straightforward, but potentially misleading */ - seq_printf(m, "temperature \t: %u C (uncalibrated)\n", - cpu_temp(cpu_id)); -#else - /* show the actual temp sensor range */ - u32 temp; - temp = cpu_temp_both(cpu_id); - seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", - temp & 0xff, temp >> 16); -#endif + if (cpu_has_feature(CPU_FTR_TAU)) { + if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { + /* more straightforward, but potentially misleading */ + seq_printf(m, "temperature \t: %u C (uncalibrated)\n", + cpu_temp(cpu_id)); + } else { + /* show the actual temp sensor range */ + u32 temp; + temp = cpu_temp_both(cpu_id); + seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", + temp & 0xff, temp >> 16); + } } #endif /* CONFIG_TAU */ /* - * Assume here that all clock rates are the same in a - * smp system. -- Cort + * Platforms that have variable clock rates, should implement + * the method ppc_md.get_proc_freq() that reports the clock + * rate of a given cpu. The rest can use ppc_proc_freq to + * report the clock rate that is same across all cpus. */ - if (ppc_proc_freq) - seq_printf(m, "clock\t\t: %lu.%06luMHz\n", - ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); + if (ppc_md.get_proc_freq) + proc_freq = ppc_md.get_proc_freq(cpu_id); + else + proc_freq = ppc_proc_freq; - if (ppc_md.show_percpuinfo != NULL) - ppc_md.show_percpuinfo(m, cpu_id); + if (proc_freq) + seq_printf(m, "clock\t\t: %lu.%06luMHz\n", + proc_freq / 1000000, proc_freq % 1000000); /* If we are a Freescale core do a simple check so - * we dont have to keep adding cases in the future */ + * we don't have to keep adding cases in the future */ if (PVR_VER(pvr) & 0x8000) { switch (PVR_VER(pvr)) { case 0x8000: /* 7441/7450/7451, Voyager */ @@ -292,14 +298,15 @@ static int show_cpuinfo(struct seq_file *m, void *v) } } else { switch (PVR_VER(pvr)) { - case 0x0020: /* 403 family */ - maj = PVR_MAJ(pvr) + 1; - min = PVR_MIN(pvr); - break; case 0x1008: /* 740P/750P ?? */ maj = ((pvr >> 8) & 0xFF) - 1; min = pvr & 0xFF; break; + case 0x004e: /* POWER9 bits 12-15 give chip type */ + case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ + maj = (pvr >> 8) & 0x0F; + min = pvr & 0xFF; + break; default: maj = (pvr >> 8) & 0xFF; min = pvr & 0xFF; @@ -310,17 +317,11 @@ static int show_cpuinfo(struct seq_file *m, void *v) seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", maj, min, PVR_VER(pvr), PVR_REV(pvr)); -#ifdef CONFIG_PPC32 - seq_printf(m, "bogomips\t: %lu.%02lu\n", - loops_per_jiffy / (500000/HZ), - (loops_per_jiffy / (5000/HZ)) % 100); -#endif + if (IS_ENABLED(CONFIG_PPC32)) + seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), + (loops_per_jiffy / (5000 / HZ)) % 100); -#ifdef CONFIG_SMP - seq_printf(m, "\n"); -#endif - - preempt_enable(); + seq_putc(m, '\n'); /* If this is the last cpu, print the summary */ if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) @@ -351,10 +352,10 @@ static void c_stop(struct seq_file *m, void *v) } const struct seq_operations cpuinfo_op = { - .start =c_start, - .next = c_next, - .stop = c_stop, - .show = show_cpuinfo, + .start = c_start, + .next = c_next, + .stop = c_stop, + .show = show_cpuinfo, }; void __init check_for_initrd(void) @@ -373,7 +374,7 @@ void __init check_for_initrd(void) initrd_start = initrd_end = 0; if (initrd_start) - printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); + pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); DBG(" <- check_for_initrd()\n"); #endif /* CONFIG_BLK_DEV_INITRD */ @@ -381,9 +382,10 @@ void __init check_for_initrd(void) #ifdef CONFIG_SMP -int threads_per_core, threads_shift; -cpumask_t threads_core_mask; +int threads_per_core, threads_per_subcore, threads_shift __read_mostly; +cpumask_t threads_core_mask __read_mostly; EXPORT_SYMBOL_GPL(threads_per_core); +EXPORT_SYMBOL_GPL(threads_per_subcore); EXPORT_SYMBOL_GPL(threads_shift); EXPORT_SYMBOL_GPL(threads_core_mask); @@ -392,6 +394,7 @@ static void __init cpu_init_thread_core_maps(int tpc) int i; threads_per_core = tpc; + threads_per_subcore = tpc; cpumask_clear(&threads_core_mask); /* This implementation only supports power of 2 number of threads @@ -404,11 +407,32 @@ static void __init cpu_init_thread_core_maps(int tpc) cpumask_set_cpu(i, &threads_core_mask); printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", - tpc, tpc > 1 ? "s" : ""); + tpc, str_plural(tpc)); printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); } +u32 *cpu_to_phys_id = NULL; + +static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present, + const __be32 *hw_ids) +{ + for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) { + __be32 hwid; + + hwid = be32_to_cpu(hw_ids[i]); + + DBG(" thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid); + + set_cpu_present(cpu, present); + set_cpu_possible(cpu, true); + cpu_to_phys_id[cpu] = hwid; + cpu++; + } + + return cpu; +} + /** * setup_cpu_maps - initialize the following cpu maps: * cpu_possible_mask @@ -429,39 +453,65 @@ static void __init cpu_init_thread_core_maps(int tpc) */ void __init smp_setup_cpu_maps(void) { - struct device_node *dn = NULL; + struct device_node *dn; int cpu = 0; int nthreads = 1; DBG("smp_setup_cpu_maps()\n"); - while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) { - const int *intserv; - int j, len; + cpu_to_phys_id = memblock_alloc_or_panic(nr_cpu_ids * sizeof(u32), + __alignof__(u32)); + + for_each_node_by_type(dn, "cpu") { + const __be32 *intserv; + __be32 cpu_be; + int len; - DBG(" * %s...\n", dn->full_name); + DBG(" * %pOF...\n", dn); intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); if (intserv) { - nthreads = len / sizeof(int); - DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", - nthreads); + DBG(" ibm,ppc-interrupt-server#s -> %lu threads\n", + (len / sizeof(int))); } else { DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); - intserv = of_get_property(dn, "reg", NULL); - if (!intserv) - intserv = &cpu; /* assume logical == phys */ + intserv = of_get_property(dn, "reg", &len); + if (!intserv) { + cpu_be = cpu_to_be32(cpu); + /* XXX: what is this? uninitialized?? */ + intserv = &cpu_be; /* assume logical == phys */ + len = 4; + } } - for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { - DBG(" thread %d -> cpu %d (hard id %d)\n", - j, cpu, intserv[j]); - set_cpu_present(cpu, true); - set_hard_smp_processor_id(cpu, intserv[j]); - set_cpu_possible(cpu, true); - cpu++; + nthreads = len / sizeof(int); + + bool avail = of_device_is_available(dn); + if (!avail) + avail = !of_property_match_string(dn, + "enable-method", "spin-table"); + + if (boot_core_hwid >= 0) { + if (cpu == 0) { + pr_info("Skipping CPU node %pOF to allow for boot core.\n", dn); + cpu = nthreads; + continue; + } + + if (be32_to_cpu(intserv[0]) == boot_core_hwid) { + pr_info("Renumbered boot core %pOF to logical 0\n", dn); + assign_threads(0, nthreads, avail, intserv); + of_node_put(dn); + break; + } + } else if (cpu >= nr_cpu_ids) { + of_node_put(dn); + break; } + + if (cpu < nr_cpu_ids) + cpu = assign_threads(cpu, nthreads, avail, intserv); } /* If no SMT supported, nthreads is forced to 1 */ @@ -475,10 +525,10 @@ void __init smp_setup_cpu_maps(void) * On pSeries LPAR, we need to know how many cpus * could possibly be added to this partition. */ - if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) && + if (firmware_has_feature(FW_FEATURE_LPAR) && (dn = of_find_node_by_path("/rtas"))) { int num_addr_cell, num_size_cell, maxcpus; - const unsigned int *ireg; + const __be32 *ireg; num_addr_cell = of_n_addr_cells(dn); num_size_cell = of_n_size_cells(dn); @@ -488,7 +538,7 @@ void __init smp_setup_cpu_maps(void) if (!ireg) goto out; - maxcpus = ireg[num_addr_cell + num_size_cell]; + maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); /* Double maxcpus for processors which have SMT capability */ if (cpu_has_feature(CPU_FTR_SMT)) @@ -497,7 +547,7 @@ void __init smp_setup_cpu_maps(void) if (maxcpus > nr_cpu_ids) { printk(KERN_WARNING "Partition configured for %d cpus, " - "operating system maximum is %d.\n", + "operating system maximum is %u.\n", maxcpus, nr_cpu_ids); maxcpus = nr_cpu_ids; } else @@ -509,7 +559,9 @@ void __init smp_setup_cpu_maps(void) out: of_node_put(dn); } - vdso_data->processorCount = num_present_cpus(); +#endif +#ifdef CONFIG_PPC64_PROC_SYSTEMCFG + systemcfg->processorCount = num_present_cpus(); #endif /* CONFIG_PPC64 */ /* Initialize CPU <=> thread mapping/ @@ -552,10 +604,19 @@ static __init int add_pcspkr(void) device_initcall(add_pcspkr); #endif /* CONFIG_PCSPKR_PLATFORM */ -void probe_machine(void) +static char ppc_hw_desc_buf[128] __initdata; + +struct seq_buf ppc_hw_desc __initdata = { + .buffer = ppc_hw_desc_buf, + .size = sizeof(ppc_hw_desc_buf), + .len = 0, +}; + +static __init void probe_machine(void) { extern struct machdep_calls __machine_desc_start; extern struct machdep_calls __machine_desc_end; + unsigned int i; /* * Iterate all ppc_md structures until we find the proper @@ -563,24 +624,44 @@ void probe_machine(void) */ DBG("Probing machine type ...\n"); + /* + * Check ppc_md is empty, if not we have a bug, ie, we setup an + * entry before probe_machine() which will be overwritten + */ + for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { + if (((void **)&ppc_md)[i]) { + printk(KERN_ERR "Entry %d in ppc_md non empty before" + " machine probe !\n", i); + } + } + for (machine_id = &__machine_desc_start; machine_id < &__machine_desc_end; machine_id++) { - DBG(" %s ...", machine_id->name); + DBG(" %s ...\n", machine_id->name); + if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible)) + continue; + if (machine_id->compatibles && !of_machine_compatible_match(machine_id->compatibles)) + continue; memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); - if (ppc_md.probe()) { - DBG(" match !\n"); - break; - } - DBG("\n"); + if (ppc_md.probe && !ppc_md.probe()) + continue; + DBG(" %s match !\n", machine_id->name); + break; } /* What can we do if we didn't find ? */ if (machine_id >= &__machine_desc_end) { - DBG("No suitable machine found !\n"); + pr_err("No suitable machine description found !\n"); for (;;); } - printk(KERN_INFO "Using %s machine description\n", ppc_md.name); + // Append the machine name to other info we've gathered + seq_buf_puts(&ppc_hw_desc, ppc_md.name); + + // Set the generic hardware description shown in oopses + dump_stack_set_arch_desc(ppc_hw_desc.buffer); + + pr_info("Hardware name: %s\n", ppc_hw_desc.buffer); } /* Match a class of boards, not a specific device configuration. */ @@ -629,7 +710,7 @@ int check_legacy_ioport(unsigned long base_port) return ret; parent = of_get_parent(np); if (parent) { - if (strcmp(parent->type, "isa") == 0) + if (of_node_is_type(parent, "isa")) ret = 0; of_node_put(parent); } @@ -638,26 +719,91 @@ int check_legacy_ioport(unsigned long base_port) } EXPORT_SYMBOL(check_legacy_ioport); -static int ppc_panic_event(struct notifier_block *this, - unsigned long event, void *ptr) +/* + * Panic notifiers setup + * + * We have 3 notifiers for powerpc, each one from a different "nature": + * + * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables + * IRQs and deal with the Firmware-Assisted dump, when it is configured; + * should run early in the panic path. + * + * - dump_kernel_offset() is an informative notifier, just showing the KASLR + * offset if we have RANDOMIZE_BASE set. + * + * - ppc_panic_platform_handler() is a low-level handler that's registered + * only if the platform wishes to perform final actions in the panic path, + * hence it should run late and might not even return. Currently, only + * pseries and ps3 platforms register callbacks. + */ +static int ppc_panic_fadump_handler(struct notifier_block *this, + unsigned long event, void *ptr) { /* + * panic does a local_irq_disable, but we really + * want interrupts to be hard disabled. + */ + hard_irq_disable(); + + /* * If firmware-assisted dump has been registered then trigger - * firmware-assisted dump and let firmware handle everything else. + * its callback and let the firmware handles everything else. */ crash_fadump(NULL, ptr); - ppc_md.panic(ptr); /* May not return */ + + return NOTIFY_DONE; +} + +static int dump_kernel_offset(struct notifier_block *self, unsigned long v, + void *p) +{ + pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", + kaslr_offset(), KERNELBASE); + return NOTIFY_DONE; } +static int ppc_panic_platform_handler(struct notifier_block *this, + unsigned long event, void *ptr) +{ + /* + * This handler is only registered if we have a panic callback + * on ppc_md, hence NULL check is not needed. + * Also, it may not return, so it runs really late on panic path. + */ + ppc_md.panic(ptr); + + return NOTIFY_DONE; +} + +static struct notifier_block ppc_fadump_block = { + .notifier_call = ppc_panic_fadump_handler, + .priority = INT_MAX, /* run early, to notify the firmware ASAP */ +}; + +static struct notifier_block kernel_offset_notifier = { + .notifier_call = dump_kernel_offset, +}; + static struct notifier_block ppc_panic_block = { - .notifier_call = ppc_panic_event, - .priority = INT_MIN /* may not return; must be done last */ + .notifier_call = ppc_panic_platform_handler, + .priority = INT_MIN, /* may not return; must be done last */ }; void __init setup_panic(void) { - atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); + /* Hard-disables IRQs + deal with FW-assisted dump (fadump) */ + atomic_notifier_chain_register(&panic_notifier_list, + &ppc_fadump_block); + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) + atomic_notifier_chain_register(&panic_notifier_list, + &kernel_offset_notifier); + + /* Low-level platform-specific routines that should run on panic */ + if (ppc_md.panic) + atomic_notifier_chain_register(&panic_notifier_list, + &ppc_panic_block); } #ifdef CONFIG_CHECK_CACHE_COHERENCY @@ -669,29 +815,25 @@ void __init setup_panic(void) * BUG() in that case. */ -#ifdef CONFIG_NOT_COHERENT_CACHE -#define KERNEL_COHERENCY 0 -#else -#define KERNEL_COHERENCY 1 -#endif +#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) static int __init check_cache_coherency(void) { struct device_node *np; const void *prop; - int devtree_coherency; + bool devtree_coherency; np = of_find_node_by_path("/"); prop = of_get_property(np, "coherency-off", NULL); of_node_put(np); - devtree_coherency = prop ? 0 : 1; + devtree_coherency = prop ? false : true; if (devtree_coherency != KERNEL_COHERENCY) { printk(KERN_ERR "kernel coherency:%s != device tree_coherency:%s\n", - KERNEL_COHERENCY ? "on" : "off", - devtree_coherency ? "on" : "off"); + str_on_off(KERNEL_COHERENCY), + str_on_off(devtree_coherency)); BUG(); } @@ -701,54 +843,183 @@ static int __init check_cache_coherency(void) late_initcall(check_cache_coherency); #endif /* CONFIG_CHECK_CACHE_COHERENCY */ -#ifdef CONFIG_DEBUG_FS -struct dentry *powerpc_debugfs_root; -EXPORT_SYMBOL(powerpc_debugfs_root); - -static int powerpc_debugfs_init(void) +void ppc_printk_progress(char *s, unsigned short hex) { - powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); - - return powerpc_debugfs_root == NULL; + pr_info("%s\n", s); } -arch_initcall(powerpc_debugfs_init); -#endif -#ifdef CONFIG_BOOKE_WDT -extern u32 booke_wdt_enabled; -extern u32 booke_wdt_period; - -/* Checks wdt=x and wdt_period=xx command-line option */ -notrace int __init early_parse_wdt(char *p) +static __init void print_system_info(void) { - if (p && strncmp(p, "0", 1) != 0) - booke_wdt_enabled = 1; + pr_info("-----------------------------------------------------\n"); + pr_info("phys_mem_size = 0x%llx\n", + (unsigned long long)memblock_phys_mem_size()); + + pr_info("dcache_bsize = 0x%x\n", dcache_bsize); + pr_info("icache_bsize = 0x%x\n", icache_bsize); + + pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); + pr_info(" possible = 0x%016lx\n", + (unsigned long)CPU_FTRS_POSSIBLE); + pr_info(" always = 0x%016lx\n", + (unsigned long)CPU_FTRS_ALWAYS); + pr_info("cpu_user_features = 0x%08x 0x%08x\n", + cur_cpu_spec->cpu_user_features, + cur_cpu_spec->cpu_user_features2); + pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); +#ifdef CONFIG_PPC64 + pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); +#ifdef CONFIG_PPC_BOOK3S + pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); + pr_info("IO start = 0x%lx\n", KERN_IO_START); + pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); +#endif +#endif - return 0; + if (!early_radix_enabled()) + print_system_hash_info(); + + if (PHYSICAL_START > 0) + pr_info("physical_start = 0x%llx\n", + (unsigned long long)PHYSICAL_START); + pr_info("-----------------------------------------------------\n"); } -early_param("wdt", early_parse_wdt); -int __init early_parse_wdt_period(char *p) +#ifdef CONFIG_SMP +static void __init smp_setup_pacas(void) { - unsigned long ret; - if (p) { - if (!kstrtol(p, 0, &ret)) - booke_wdt_period = ret; + int cpu; + + for_each_possible_cpu(cpu) { + if (cpu == smp_processor_id()) + continue; + allocate_paca(cpu); + set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); } - return 0; + memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32)); + cpu_to_phys_id = NULL; } -early_param("wdt_period", early_parse_wdt_period); -#endif /* CONFIG_BOOKE_WDT */ +#endif -void ppc_printk_progress(char *s, unsigned short hex) +/* + * Called into from start_kernel this initializes memblock, which is used + * to manage page allocation until mem_init is called. + */ +void __init setup_arch(char **cmdline_p) { - pr_info("%s\n", s); -} + kasan_init(); -void arch_setup_pdev_archdata(struct platform_device *pdev) -{ - pdev->archdata.dma_mask = DMA_BIT_MASK(32); - pdev->dev.dma_mask = &pdev->archdata.dma_mask; - set_dma_ops(&pdev->dev, &dma_direct_ops); + *cmdline_p = boot_command_line; + + /* Set a half-reasonable default so udelay does something sensible */ + loops_per_jiffy = 500000000 / HZ; + + /* Unflatten the device-tree passed by prom_init or kexec */ + unflatten_device_tree(); + + /* + * Initialize cache line/block info from device-tree (on ppc64) or + * just cputable (on ppc32). + */ + initialize_cache_info(); + + /* Initialize RTAS if available. */ + rtas_initialize(); + + /* Check if we have an initrd provided via the device-tree. */ + check_for_initrd(); + + /* Probe the machine type, establish ppc_md. */ + probe_machine(); + + /* Setup panic notifier if requested by the platform. */ + setup_panic(); + + /* + * Configure ppc_md.power_save (ppc32 only, 64-bit machines do + * it from their respective probe() function. + */ + setup_power_save(); + + /* Discover standard serial ports. */ + find_legacy_serial_ports(); + + /* Register early console with the printk subsystem. */ + register_early_udbg_console(); + + /* Setup the various CPU maps based on the device-tree. */ + smp_setup_cpu_maps(); + + /* Initialize xmon. */ + xmon_setup(); + + /* Check the SMT related command line arguments (ppc64). */ + check_smt_enabled(); + + /* Parse memory topology */ + mem_topology_setup(); + high_memory = (void *)__va(max_low_pfn * PAGE_SIZE); + + /* + * Release secondary cpus out of their spinloops at 0x60 now that + * we can map physical -> logical CPU ids. + * + * Freescale Book3e parts spin in a loop provided by firmware, + * so smp_release_cpus() does nothing for them. + */ +#ifdef CONFIG_SMP + smp_setup_pacas(); + + /* On BookE, setup per-core TLB data structures. */ + setup_tlb_core_data(); +#endif + + /* Print various info about the machine that has been gathered so far. */ + print_system_info(); + + klp_init_thread_info(&init_task); + + setup_initial_init_mm(_stext, _etext, _edata, _end); + /* sched_init() does the mmgrab(&init_mm) for the primary CPU */ + VM_WARN_ON(cpumask_test_cpu(smp_processor_id(), mm_cpumask(&init_mm))); + cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm)); + inc_mm_active_cpus(&init_mm); + mm_iommu_init(&init_mm); + + irqstack_early_init(); + exc_lvl_early_init(); + emergency_stack_init(); + + mce_init(); + smp_release_cpus(); + + initmem_init(); + + /* + * Reserve large chunks of memory for use by CMA for kdump, fadump, KVM and + * hugetlb. These must be called after initmem_init(), so that + * pageblock_order is initialised. + */ + fadump_cma_init(); + kdump_cma_reserve(); + kvm_cma_reserve(); + gigantic_hugetlb_cma_reserve(); + + early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); + + if (ppc_md.setup_arch) + ppc_md.setup_arch(); + + setup_barrier_nospec(); + setup_spectre_v2(); + + paging_init(); + + /* Initialize the MMU context management stuff. */ + mmu_context_init(); + + /* Interrupt code needs to be 64K-aligned. */ + if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) + panic("Kernelbase not 64K-aligned (0x%lx)!\n", + (unsigned long)_stext); } |