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672 lines
17 KiB
672 lines
17 KiB
/*
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*
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* Common boot and setup code.
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*
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* Copyright (C) 2001 PPC64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define DEBUG
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#include <linux/export.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/seq_file.h>
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#include <linux/ioport.h>
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#include <linux/console.h>
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#include <linux/utsname.h>
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#include <linux/tty.h>
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#include <linux/root_dev.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/unistd.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/bootmem.h>
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#include <linux/pci.h>
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#include <linux/lockdep.h>
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#include <linux/memblock.h>
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#include <linux/memory.h>
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#include <linux/nmi.h>
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#include <asm/io.h>
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#include <asm/kdump.h>
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#include <asm/prom.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/smp.h>
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#include <asm/elf.h>
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#include <asm/machdep.h>
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#include <asm/paca.h>
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#include <asm/time.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/btext.h>
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#include <asm/nvram.h>
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#include <asm/setup.h>
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#include <asm/rtas.h>
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#include <asm/iommu.h>
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#include <asm/serial.h>
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#include <asm/cache.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/firmware.h>
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#include <asm/xmon.h>
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#include <asm/udbg.h>
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#include <asm/kexec.h>
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#include <asm/code-patching.h>
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#include <asm/livepatch.h>
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#include <asm/opal.h>
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#include <asm/cputhreads.h>
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#ifdef DEBUG
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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int spinning_secondaries;
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u64 ppc64_pft_size;
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/* Pick defaults since we might want to patch instructions
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* before we've read this from the device tree.
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*/
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struct ppc64_caches ppc64_caches = {
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.dline_size = 0x40,
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.log_dline_size = 6,
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.iline_size = 0x40,
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.log_iline_size = 6
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};
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EXPORT_SYMBOL_GPL(ppc64_caches);
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/*
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* These are used in binfmt_elf.c to put aux entries on the stack
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* for each elf executable being started.
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*/
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int dcache_bsize;
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int icache_bsize;
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int ucache_bsize;
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#if defined(CONFIG_PPC_BOOK3E) && defined(CONFIG_SMP)
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void __init setup_tlb_core_data(void)
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{
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int cpu;
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BUILD_BUG_ON(offsetof(struct tlb_core_data, lock) != 0);
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for_each_possible_cpu(cpu) {
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int first = cpu_first_thread_sibling(cpu);
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/*
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* If we boot via kdump on a non-primary thread,
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* make sure we point at the thread that actually
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* set up this TLB.
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*/
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if (cpu_first_thread_sibling(boot_cpuid) == first)
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first = boot_cpuid;
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paca[cpu].tcd_ptr = &paca[first].tcd;
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/*
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* If we have threads, we need either tlbsrx.
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* or e6500 tablewalk mode, or else TLB handlers
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* will be racy and could produce duplicate entries.
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*/
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if (smt_enabled_at_boot >= 2 &&
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!mmu_has_feature(MMU_FTR_USE_TLBRSRV) &&
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book3e_htw_mode != PPC_HTW_E6500) {
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/* Should we panic instead? */
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WARN_ONCE("%s: unsupported MMU configuration -- expect problems\n",
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__func__);
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}
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}
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}
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#endif
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#ifdef CONFIG_SMP
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static char *smt_enabled_cmdline;
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/* Look for ibm,smt-enabled OF option */
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void __init check_smt_enabled(void)
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{
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struct device_node *dn;
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const char *smt_option;
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/* Default to enabling all threads */
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smt_enabled_at_boot = threads_per_core;
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/* Allow the command line to overrule the OF option */
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if (smt_enabled_cmdline) {
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if (!strcmp(smt_enabled_cmdline, "on"))
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smt_enabled_at_boot = threads_per_core;
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else if (!strcmp(smt_enabled_cmdline, "off"))
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smt_enabled_at_boot = 0;
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else {
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int smt;
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int rc;
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rc = kstrtoint(smt_enabled_cmdline, 10, &smt);
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if (!rc)
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smt_enabled_at_boot =
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min(threads_per_core, smt);
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}
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} else {
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dn = of_find_node_by_path("/options");
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if (dn) {
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smt_option = of_get_property(dn, "ibm,smt-enabled",
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NULL);
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if (smt_option) {
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if (!strcmp(smt_option, "on"))
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smt_enabled_at_boot = threads_per_core;
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else if (!strcmp(smt_option, "off"))
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smt_enabled_at_boot = 0;
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}
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of_node_put(dn);
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}
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}
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}
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/* Look for smt-enabled= cmdline option */
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static int __init early_smt_enabled(char *p)
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{
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smt_enabled_cmdline = p;
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return 0;
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}
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early_param("smt-enabled", early_smt_enabled);
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#endif /* CONFIG_SMP */
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/** Fix up paca fields required for the boot cpu */
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static void __init fixup_boot_paca(void)
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{
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/* The boot cpu is started */
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get_paca()->cpu_start = 1;
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/* Allow percpu accesses to work until we setup percpu data */
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get_paca()->data_offset = 0;
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}
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static void __init configure_exceptions(void)
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{
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/*
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* Setup the trampolines from the lowmem exception vectors
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* to the kdump kernel when not using a relocatable kernel.
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*/
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setup_kdump_trampoline();
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/* Under a PAPR hypervisor, we need hypercalls */
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if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
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/* Enable AIL if possible */
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pseries_enable_reloc_on_exc();
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/*
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* Tell the hypervisor that we want our exceptions to
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* be taken in little endian mode.
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*
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* We don't call this for big endian as our calling convention
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* makes us always enter in BE, and the call may fail under
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* some circumstances with kdump.
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*/
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#ifdef __LITTLE_ENDIAN__
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pseries_little_endian_exceptions();
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#endif
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} else {
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/* Set endian mode using OPAL */
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if (firmware_has_feature(FW_FEATURE_OPAL))
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opal_configure_cores();
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/* AIL on native is done in cpu_ready_for_interrupts() */
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}
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}
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static void cpu_ready_for_interrupts(void)
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{
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/*
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* Enable AIL if supported, and we are in hypervisor mode. This
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* is called once for every processor.
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*
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* If we are not in hypervisor mode the job is done once for
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* the whole partition in configure_exceptions().
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*/
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if (early_cpu_has_feature(CPU_FTR_HVMODE) &&
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early_cpu_has_feature(CPU_FTR_ARCH_207S)) {
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unsigned long lpcr = mfspr(SPRN_LPCR);
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mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3);
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}
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/* Set IR and DR in PACA MSR */
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get_paca()->kernel_msr = MSR_KERNEL;
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}
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/*
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* Early initialization entry point. This is called by head.S
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* with MMU translation disabled. We rely on the "feature" of
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* the CPU that ignores the top 2 bits of the address in real
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* mode so we can access kernel globals normally provided we
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* only toy with things in the RMO region. From here, we do
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* some early parsing of the device-tree to setup out MEMBLOCK
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* data structures, and allocate & initialize the hash table
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* and segment tables so we can start running with translation
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* enabled.
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*
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* It is this function which will call the probe() callback of
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* the various platform types and copy the matching one to the
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* global ppc_md structure. Your platform can eventually do
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* some very early initializations from the probe() routine, but
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* this is not recommended, be very careful as, for example, the
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* device-tree is not accessible via normal means at this point.
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*/
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void __init early_setup(unsigned long dt_ptr)
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{
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static __initdata struct paca_struct boot_paca;
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/* -------- printk is _NOT_ safe to use here ! ------- */
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/* Identify CPU type */
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identify_cpu(0, mfspr(SPRN_PVR));
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/* Assume we're on cpu 0 for now. Don't write to the paca yet! */
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initialise_paca(&boot_paca, 0);
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setup_paca(&boot_paca);
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fixup_boot_paca();
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/* -------- printk is now safe to use ------- */
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/* Enable early debugging if any specified (see udbg.h) */
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udbg_early_init();
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DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
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/*
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* Do early initialization using the flattened device
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* tree, such as retrieving the physical memory map or
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* calculating/retrieving the hash table size.
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*/
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early_init_devtree(__va(dt_ptr));
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/* Now we know the logical id of our boot cpu, setup the paca. */
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setup_paca(&paca[boot_cpuid]);
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fixup_boot_paca();
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/*
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* Configure exception handlers. This include setting up trampolines
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* if needed, setting exception endian mode, etc...
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*/
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configure_exceptions();
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/* Apply all the dynamic patching */
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apply_feature_fixups();
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setup_feature_keys();
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/* Initialize the hash table or TLB handling */
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early_init_mmu();
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/*
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* At this point, we can let interrupts switch to virtual mode
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* (the MMU has been setup), so adjust the MSR in the PACA to
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* have IR and DR set and enable AIL if it exists
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*/
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cpu_ready_for_interrupts();
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DBG(" <- early_setup()\n");
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#ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
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/*
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* This needs to be done *last* (after the above DBG() even)
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*
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* Right after we return from this function, we turn on the MMU
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* which means the real-mode access trick that btext does will
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* no longer work, it needs to switch to using a real MMU
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* mapping. This call will ensure that it does
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*/
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btext_map();
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#endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
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}
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#ifdef CONFIG_SMP
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void early_setup_secondary(void)
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{
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/* Mark interrupts disabled in PACA */
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get_paca()->soft_enabled = 0;
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/* Initialize the hash table or TLB handling */
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early_init_mmu_secondary();
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/*
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* At this point, we can let interrupts switch to virtual mode
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* (the MMU has been setup), so adjust the MSR in the PACA to
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* have IR and DR set.
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*/
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cpu_ready_for_interrupts();
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}
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#endif /* CONFIG_SMP */
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#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC_CORE)
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static bool use_spinloop(void)
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{
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if (!IS_ENABLED(CONFIG_PPC_BOOK3E))
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return true;
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/*
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* When book3e boots from kexec, the ePAPR spin table does
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* not get used.
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*/
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return of_property_read_bool(of_chosen, "linux,booted-from-kexec");
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}
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void smp_release_cpus(void)
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{
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unsigned long *ptr;
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int i;
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if (!use_spinloop())
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return;
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DBG(" -> smp_release_cpus()\n");
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/* All secondary cpus are spinning on a common spinloop, release them
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* all now so they can start to spin on their individual paca
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* spinloops. For non SMP kernels, the secondary cpus never get out
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* of the common spinloop.
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*/
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ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
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- PHYSICAL_START);
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*ptr = ppc_function_entry(generic_secondary_smp_init);
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/* And wait a bit for them to catch up */
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for (i = 0; i < 100000; i++) {
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mb();
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HMT_low();
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if (spinning_secondaries == 0)
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break;
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udelay(1);
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}
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DBG("spinning_secondaries = %d\n", spinning_secondaries);
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DBG(" <- smp_release_cpus()\n");
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}
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#endif /* CONFIG_SMP || CONFIG_KEXEC_CORE */
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/*
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* Initialize some remaining members of the ppc64_caches and systemcfg
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* structures
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* (at least until we get rid of them completely). This is mostly some
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* cache informations about the CPU that will be used by cache flush
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* routines and/or provided to userland
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*/
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void __init initialize_cache_info(void)
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{
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struct device_node *np;
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unsigned long num_cpus = 0;
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DBG(" -> initialize_cache_info()\n");
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for_each_node_by_type(np, "cpu") {
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num_cpus += 1;
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/*
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* We're assuming *all* of the CPUs have the same
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* d-cache and i-cache sizes... -Peter
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*/
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if (num_cpus == 1) {
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const __be32 *sizep, *lsizep;
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u32 size, lsize;
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size = 0;
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lsize = cur_cpu_spec->dcache_bsize;
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sizep = of_get_property(np, "d-cache-size", NULL);
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if (sizep != NULL)
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size = be32_to_cpu(*sizep);
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lsizep = of_get_property(np, "d-cache-block-size",
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NULL);
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/* fallback if block size missing */
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if (lsizep == NULL)
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lsizep = of_get_property(np,
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"d-cache-line-size",
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NULL);
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if (lsizep != NULL)
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lsize = be32_to_cpu(*lsizep);
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if (sizep == NULL || lsizep == NULL)
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DBG("Argh, can't find dcache properties ! "
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"sizep: %p, lsizep: %p\n", sizep, lsizep);
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ppc64_caches.dsize = size;
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ppc64_caches.dline_size = lsize;
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ppc64_caches.log_dline_size = __ilog2(lsize);
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ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
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size = 0;
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lsize = cur_cpu_spec->icache_bsize;
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sizep = of_get_property(np, "i-cache-size", NULL);
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if (sizep != NULL)
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size = be32_to_cpu(*sizep);
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lsizep = of_get_property(np, "i-cache-block-size",
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NULL);
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if (lsizep == NULL)
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lsizep = of_get_property(np,
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"i-cache-line-size",
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NULL);
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if (lsizep != NULL)
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lsize = be32_to_cpu(*lsizep);
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if (sizep == NULL || lsizep == NULL)
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DBG("Argh, can't find icache properties ! "
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"sizep: %p, lsizep: %p\n", sizep, lsizep);
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ppc64_caches.isize = size;
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ppc64_caches.iline_size = lsize;
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ppc64_caches.log_iline_size = __ilog2(lsize);
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ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
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}
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}
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/* For use by binfmt_elf */
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dcache_bsize = ppc64_caches.dline_size;
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icache_bsize = ppc64_caches.iline_size;
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DBG(" <- initialize_cache_info()\n");
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}
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/* This returns the limit below which memory accesses to the linear
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* mapping are guarnateed not to cause a TLB or SLB miss. This is
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* used to allocate interrupt or emergency stacks for which our
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* exception entry path doesn't deal with being interrupted.
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*/
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static __init u64 safe_stack_limit(void)
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{
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#ifdef CONFIG_PPC_BOOK3E
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/* Freescale BookE bolts the entire linear mapping */
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if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
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return linear_map_top;
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/* Other BookE, we assume the first GB is bolted */
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return 1ul << 30;
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#else
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/* BookS, the first segment is bolted */
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if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
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return 1UL << SID_SHIFT_1T;
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return 1UL << SID_SHIFT;
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#endif
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}
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void __init irqstack_early_init(void)
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{
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u64 limit = safe_stack_limit();
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unsigned int i;
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/*
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* Interrupt stacks must be in the first segment since we
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* cannot afford to take SLB misses on them.
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*/
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for_each_possible_cpu(i) {
|
|
softirq_ctx[i] = (struct thread_info *)
|
|
__va(memblock_alloc_base(THREAD_SIZE,
|
|
THREAD_SIZE, limit));
|
|
hardirq_ctx[i] = (struct thread_info *)
|
|
__va(memblock_alloc_base(THREAD_SIZE,
|
|
THREAD_SIZE, limit));
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_BOOK3E
|
|
void __init exc_lvl_early_init(void)
|
|
{
|
|
unsigned int i;
|
|
unsigned long sp;
|
|
|
|
for_each_possible_cpu(i) {
|
|
sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
|
|
critirq_ctx[i] = (struct thread_info *)__va(sp);
|
|
paca[i].crit_kstack = __va(sp + THREAD_SIZE);
|
|
|
|
sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
|
|
dbgirq_ctx[i] = (struct thread_info *)__va(sp);
|
|
paca[i].dbg_kstack = __va(sp + THREAD_SIZE);
|
|
|
|
sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
|
|
mcheckirq_ctx[i] = (struct thread_info *)__va(sp);
|
|
paca[i].mc_kstack = __va(sp + THREAD_SIZE);
|
|
}
|
|
|
|
if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
|
|
patch_exception(0x040, exc_debug_debug_book3e);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Stack space used when we detect a bad kernel stack pointer, and
|
|
* early in SMP boots before relocation is enabled. Exclusive emergency
|
|
* stack for machine checks.
|
|
*/
|
|
void __init emergency_stack_init(void)
|
|
{
|
|
u64 limit;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* Emergency stacks must be under 256MB, we cannot afford to take
|
|
* SLB misses on them. The ABI also requires them to be 128-byte
|
|
* aligned.
|
|
*
|
|
* Since we use these as temporary stacks during secondary CPU
|
|
* bringup, we need to get at them in real mode. This means they
|
|
* must also be within the RMO region.
|
|
*/
|
|
limit = min(safe_stack_limit(), ppc64_rma_size);
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct thread_info *ti;
|
|
ti = __va(memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit));
|
|
klp_init_thread_info(ti);
|
|
paca[i].emergency_sp = (void *)ti + THREAD_SIZE;
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S_64
|
|
/* emergency stack for machine check exception handling. */
|
|
ti = __va(memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit));
|
|
klp_init_thread_info(ti);
|
|
paca[i].mc_emergency_sp = (void *)ti + THREAD_SIZE;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define PCPU_DYN_SIZE ()
|
|
|
|
static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align)
|
|
{
|
|
return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align,
|
|
__pa(MAX_DMA_ADDRESS));
|
|
}
|
|
|
|
static void __init pcpu_fc_free(void *ptr, size_t size)
|
|
{
|
|
free_bootmem(__pa(ptr), size);
|
|
}
|
|
|
|
static int pcpu_cpu_distance(unsigned int from, unsigned int to)
|
|
{
|
|
if (cpu_to_node(from) == cpu_to_node(to))
|
|
return LOCAL_DISTANCE;
|
|
else
|
|
return REMOTE_DISTANCE;
|
|
}
|
|
|
|
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
|
|
EXPORT_SYMBOL(__per_cpu_offset);
|
|
|
|
void __init setup_per_cpu_areas(void)
|
|
{
|
|
const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
|
|
size_t atom_size;
|
|
unsigned long delta;
|
|
unsigned int cpu;
|
|
int rc;
|
|
|
|
/*
|
|
* Linear mapping is one of 4K, 1M and 16M. For 4K, no need
|
|
* to group units. For larger mappings, use 1M atom which
|
|
* should be large enough to contain a number of units.
|
|
*/
|
|
if (mmu_linear_psize == MMU_PAGE_4K)
|
|
atom_size = PAGE_SIZE;
|
|
else
|
|
atom_size = 1 << 20;
|
|
|
|
rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance,
|
|
pcpu_fc_alloc, pcpu_fc_free);
|
|
if (rc < 0)
|
|
panic("cannot initialize percpu area (err=%d)", rc);
|
|
|
|
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
|
|
for_each_possible_cpu(cpu) {
|
|
__per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
|
|
paca[cpu].data_offset = __per_cpu_offset[cpu];
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
|
|
unsigned long memory_block_size_bytes(void)
|
|
{
|
|
if (ppc_md.memory_block_size)
|
|
return ppc_md.memory_block_size();
|
|
|
|
return MIN_MEMORY_BLOCK_SIZE;
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_PPC_INDIRECT_PIO) || defined(CONFIG_PPC_INDIRECT_MMIO)
|
|
struct ppc_pci_io ppc_pci_io;
|
|
EXPORT_SYMBOL(ppc_pci_io);
|
|
#endif
|
|
|
|
#ifdef CONFIG_HARDLOCKUP_DETECTOR
|
|
u64 hw_nmi_get_sample_period(int watchdog_thresh)
|
|
{
|
|
return ppc_proc_freq * watchdog_thresh;
|
|
}
|
|
|
|
/*
|
|
* The hardlockup detector breaks PMU event based branches and is likely
|
|
* to get false positives in KVM guests, so disable it by default.
|
|
*/
|
|
static int __init disable_hardlockup_detector(void)
|
|
{
|
|
hardlockup_detector_disable();
|
|
|
|
return 0;
|
|
}
|
|
early_initcall(disable_hardlockup_detector);
|
|
#endif
|
|
|