8d089085a4
This cleans up the SMT thread handling, removing some hard coded assumptions and providing a set of helpers to convert between linux cpu numbers, thread numbers and cores. This implementation requires the number of threads per core to be a power of 2 and identical on all cores in the system, but it's an implementation detail, not an API requirement and so this limitation can be lifted in the future if anybody ever needs it. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
664 lines
15 KiB
C
664 lines
15 KiB
C
/*
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* Common boot and setup code for both 32-bit and 64-bit.
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* Extracted from arch/powerpc/kernel/setup_64.c.
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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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#undef DEBUG
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#include <linux/module.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/platform_device.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/screen_info.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/debugfs.h>
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#include <linux/percpu.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/processor.h>
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#include <asm/vdso_datapage.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/time.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/firmware.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/system.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/lmb.h>
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#include <asm/xmon.h>
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#include <asm/cputhreads.h>
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#include "setup.h"
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#ifdef DEBUG
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#include <asm/udbg.h>
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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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/* The main machine-dep calls structure
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*/
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struct machdep_calls ppc_md;
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EXPORT_SYMBOL(ppc_md);
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struct machdep_calls *machine_id;
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EXPORT_SYMBOL(machine_id);
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unsigned long klimit = (unsigned long) _end;
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char cmd_line[COMMAND_LINE_SIZE];
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/*
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* This still seems to be needed... -- paulus
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*/
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struct screen_info screen_info = {
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.orig_x = 0,
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.orig_y = 25,
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.orig_video_cols = 80,
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.orig_video_lines = 25,
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.orig_video_isVGA = 1,
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.orig_video_points = 16
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};
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#ifdef __DO_IRQ_CANON
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/* XXX should go elsewhere eventually */
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int ppc_do_canonicalize_irqs;
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EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
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#endif
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/* also used by kexec */
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void machine_shutdown(void)
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{
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if (ppc_md.machine_shutdown)
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ppc_md.machine_shutdown();
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}
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void machine_restart(char *cmd)
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{
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machine_shutdown();
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if (ppc_md.restart)
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ppc_md.restart(cmd);
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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printk(KERN_EMERG "System Halted, OK to turn off power\n");
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local_irq_disable();
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while (1) ;
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}
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void machine_power_off(void)
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{
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machine_shutdown();
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if (ppc_md.power_off)
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ppc_md.power_off();
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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printk(KERN_EMERG "System Halted, OK to turn off power\n");
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local_irq_disable();
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while (1) ;
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}
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/* Used by the G5 thermal driver */
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EXPORT_SYMBOL_GPL(machine_power_off);
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL_GPL(pm_power_off);
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void machine_halt(void)
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{
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machine_shutdown();
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if (ppc_md.halt)
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ppc_md.halt();
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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printk(KERN_EMERG "System Halted, OK to turn off power\n");
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local_irq_disable();
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while (1) ;
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}
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#ifdef CONFIG_TAU
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extern u32 cpu_temp(unsigned long cpu);
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extern u32 cpu_temp_both(unsigned long cpu);
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#endif /* CONFIG_TAU */
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#ifdef CONFIG_SMP
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DEFINE_PER_CPU(unsigned int, pvr);
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#endif
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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unsigned long cpu_id = (unsigned long)v - 1;
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unsigned int pvr;
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unsigned short maj;
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unsigned short min;
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if (cpu_id == NR_CPUS) {
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#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
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unsigned long bogosum = 0;
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int i;
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for_each_online_cpu(i)
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bogosum += loops_per_jiffy;
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seq_printf(m, "total bogomips\t: %lu.%02lu\n",
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bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
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#endif /* CONFIG_SMP && CONFIG_PPC32 */
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seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
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if (ppc_md.name)
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seq_printf(m, "platform\t: %s\n", ppc_md.name);
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if (ppc_md.show_cpuinfo != NULL)
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ppc_md.show_cpuinfo(m);
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return 0;
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}
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/* We only show online cpus: disable preempt (overzealous, I
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* knew) to prevent cpu going down. */
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preempt_disable();
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if (!cpu_online(cpu_id)) {
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preempt_enable();
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return 0;
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}
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#ifdef CONFIG_SMP
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pvr = per_cpu(pvr, cpu_id);
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#else
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pvr = mfspr(SPRN_PVR);
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#endif
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maj = (pvr >> 8) & 0xFF;
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min = pvr & 0xFF;
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seq_printf(m, "processor\t: %lu\n", cpu_id);
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seq_printf(m, "cpu\t\t: ");
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if (cur_cpu_spec->pvr_mask)
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seq_printf(m, "%s", cur_cpu_spec->cpu_name);
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else
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seq_printf(m, "unknown (%08x)", pvr);
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#ifdef CONFIG_ALTIVEC
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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seq_printf(m, ", altivec supported");
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#endif /* CONFIG_ALTIVEC */
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seq_printf(m, "\n");
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#ifdef CONFIG_TAU
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if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
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#ifdef CONFIG_TAU_AVERAGE
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/* more straightforward, but potentially misleading */
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seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
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cpu_temp(cpu_id));
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#else
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/* show the actual temp sensor range */
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u32 temp;
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temp = cpu_temp_both(cpu_id);
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seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
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temp & 0xff, temp >> 16);
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#endif
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}
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#endif /* CONFIG_TAU */
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/*
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* Assume here that all clock rates are the same in a
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* smp system. -- Cort
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*/
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if (ppc_proc_freq)
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seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
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ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
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if (ppc_md.show_percpuinfo != NULL)
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ppc_md.show_percpuinfo(m, cpu_id);
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/* If we are a Freescale core do a simple check so
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* we dont have to keep adding cases in the future */
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if (PVR_VER(pvr) & 0x8000) {
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maj = PVR_MAJ(pvr);
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min = PVR_MIN(pvr);
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} else {
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switch (PVR_VER(pvr)) {
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case 0x0020: /* 403 family */
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maj = PVR_MAJ(pvr) + 1;
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min = PVR_MIN(pvr);
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break;
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case 0x1008: /* 740P/750P ?? */
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maj = ((pvr >> 8) & 0xFF) - 1;
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min = pvr & 0xFF;
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break;
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default:
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maj = (pvr >> 8) & 0xFF;
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min = pvr & 0xFF;
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break;
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}
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}
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seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
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maj, min, PVR_VER(pvr), PVR_REV(pvr));
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#ifdef CONFIG_PPC32
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seq_printf(m, "bogomips\t: %lu.%02lu\n",
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loops_per_jiffy / (500000/HZ),
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(loops_per_jiffy / (5000/HZ)) % 100);
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#endif
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#ifdef CONFIG_SMP
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seq_printf(m, "\n");
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#endif
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preempt_enable();
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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unsigned long i = *pos;
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return i <= NR_CPUS ? (void *)(i + 1) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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struct seq_operations cpuinfo_op = {
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.start =c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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void __init check_for_initrd(void)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
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initrd_start, initrd_end);
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/* If we were passed an initrd, set the ROOT_DEV properly if the values
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* look sensible. If not, clear initrd reference.
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*/
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if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
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initrd_end > initrd_start)
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ROOT_DEV = Root_RAM0;
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else
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initrd_start = initrd_end = 0;
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if (initrd_start)
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printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
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DBG(" <- check_for_initrd()\n");
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#endif /* CONFIG_BLK_DEV_INITRD */
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}
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#ifdef CONFIG_SMP
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int threads_per_core, threads_shift;
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cpumask_t threads_core_mask;
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static void __init cpu_init_thread_core_maps(int tpc)
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{
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int i;
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threads_per_core = tpc;
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threads_core_mask = CPU_MASK_NONE;
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/* This implementation only supports power of 2 number of threads
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* for simplicity and performance
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*/
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threads_shift = ilog2(tpc);
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BUG_ON(tpc != (1 << threads_shift));
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for (i = 0; i < tpc; i++)
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cpu_set(i, threads_core_mask);
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printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
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tpc, tpc > 1 ? "s" : "");
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printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
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}
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/**
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* setup_cpu_maps - initialize the following cpu maps:
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* cpu_possible_map
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* cpu_present_map
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* cpu_sibling_map
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*
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* Having the possible map set up early allows us to restrict allocations
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* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
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*
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* We do not initialize the online map here; cpus set their own bits in
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* cpu_online_map as they come up.
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*
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* This function is valid only for Open Firmware systems. finish_device_tree
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* must be called before using this.
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*
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* While we're here, we may as well set the "physical" cpu ids in the paca.
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*
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* NOTE: This must match the parsing done in early_init_dt_scan_cpus.
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*/
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void __init smp_setup_cpu_maps(void)
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{
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struct device_node *dn = NULL;
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int cpu = 0;
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int nthreads = 1;
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DBG("smp_setup_cpu_maps()\n");
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while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
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const int *intserv;
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int j, len;
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DBG(" * %s...\n", dn->full_name);
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intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
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&len);
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if (intserv) {
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nthreads = len / sizeof(int);
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DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
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nthreads);
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} else {
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DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
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intserv = of_get_property(dn, "reg", NULL);
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if (!intserv)
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intserv = &cpu; /* assume logical == phys */
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}
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for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
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DBG(" thread %d -> cpu %d (hard id %d)\n",
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j, cpu, intserv[j]);
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cpu_set(cpu, cpu_present_map);
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set_hard_smp_processor_id(cpu, intserv[j]);
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cpu_set(cpu, cpu_possible_map);
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cpu++;
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}
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}
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/* If no SMT supported, nthreads is forced to 1 */
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if (!cpu_has_feature(CPU_FTR_SMT)) {
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DBG(" SMT disabled ! nthreads forced to 1\n");
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nthreads = 1;
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}
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#ifdef CONFIG_PPC64
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/*
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* On pSeries LPAR, we need to know how many cpus
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* could possibly be added to this partition.
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*/
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if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
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(dn = of_find_node_by_path("/rtas"))) {
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int num_addr_cell, num_size_cell, maxcpus;
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const unsigned int *ireg;
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num_addr_cell = of_n_addr_cells(dn);
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num_size_cell = of_n_size_cells(dn);
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ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
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if (!ireg)
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goto out;
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maxcpus = ireg[num_addr_cell + num_size_cell];
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/* Double maxcpus for processors which have SMT capability */
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if (cpu_has_feature(CPU_FTR_SMT))
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maxcpus *= nthreads;
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if (maxcpus > NR_CPUS) {
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printk(KERN_WARNING
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"Partition configured for %d cpus, "
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"operating system maximum is %d.\n",
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maxcpus, NR_CPUS);
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maxcpus = NR_CPUS;
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} else
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printk(KERN_INFO "Partition configured for %d cpus.\n",
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maxcpus);
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for (cpu = 0; cpu < maxcpus; cpu++)
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cpu_set(cpu, cpu_possible_map);
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out:
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of_node_put(dn);
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}
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vdso_data->processorCount = num_present_cpus();
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#endif /* CONFIG_PPC64 */
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/* Initialize CPU <=> thread mapping/
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*
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* WARNING: We assume that the number of threads is the same for
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* every CPU in the system. If that is not the case, then some code
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* here will have to be reworked
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*/
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cpu_init_thread_core_maps(nthreads);
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}
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/*
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* Being that cpu_sibling_map is now a per_cpu array, then it cannot
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* be initialized until the per_cpu areas have been created. This
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* function is now called from setup_per_cpu_areas().
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*/
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void __init smp_setup_cpu_sibling_map(void)
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{
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#ifdef CONFIG_PPC64
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int i, cpu, base;
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for_each_possible_cpu(cpu) {
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DBG("Sibling map for CPU %d:", cpu);
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base = cpu_first_thread_in_core(cpu);
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for (i = 0; i < threads_per_core; i++) {
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cpu_set(base + i, per_cpu(cpu_sibling_map, cpu));
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DBG(" %d", base + i);
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}
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DBG("\n");
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}
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#endif /* CONFIG_PPC64 */
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}
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#endif /* CONFIG_SMP */
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static __init int add_pcspkr(void)
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{
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struct device_node *np;
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struct platform_device *pd;
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int ret;
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np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
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of_node_put(np);
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if (!np)
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return -ENODEV;
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pd = platform_device_alloc("pcspkr", -1);
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if (!pd)
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return -ENOMEM;
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ret = platform_device_add(pd);
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if (ret)
|
|
platform_device_put(pd);
|
|
|
|
return ret;
|
|
}
|
|
device_initcall(add_pcspkr);
|
|
|
|
void probe_machine(void)
|
|
{
|
|
extern struct machdep_calls __machine_desc_start;
|
|
extern struct machdep_calls __machine_desc_end;
|
|
|
|
/*
|
|
* Iterate all ppc_md structures until we find the proper
|
|
* one for the current machine type
|
|
*/
|
|
DBG("Probing machine type ...\n");
|
|
|
|
for (machine_id = &__machine_desc_start;
|
|
machine_id < &__machine_desc_end;
|
|
machine_id++) {
|
|
DBG(" %s ...", machine_id->name);
|
|
memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
|
|
if (ppc_md.probe()) {
|
|
DBG(" match !\n");
|
|
break;
|
|
}
|
|
DBG("\n");
|
|
}
|
|
/* What can we do if we didn't find ? */
|
|
if (machine_id >= &__machine_desc_end) {
|
|
DBG("No suitable machine found !\n");
|
|
for (;;);
|
|
}
|
|
|
|
printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
|
|
}
|
|
|
|
/* Match a class of boards, not a specific device configuration. */
|
|
int check_legacy_ioport(unsigned long base_port)
|
|
{
|
|
struct device_node *parent, *np = NULL;
|
|
int ret = -ENODEV;
|
|
|
|
switch(base_port) {
|
|
case I8042_DATA_REG:
|
|
if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
|
|
np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
|
|
if (np) {
|
|
parent = of_get_parent(np);
|
|
of_node_put(np);
|
|
np = parent;
|
|
break;
|
|
}
|
|
np = of_find_node_by_type(NULL, "8042");
|
|
/* Pegasos has no device_type on its 8042 node, look for the
|
|
* name instead */
|
|
if (!np)
|
|
np = of_find_node_by_name(NULL, "8042");
|
|
break;
|
|
case FDC_BASE: /* FDC1 */
|
|
np = of_find_node_by_type(NULL, "fdc");
|
|
break;
|
|
#ifdef CONFIG_PPC_PREP
|
|
case _PIDXR:
|
|
case _PNPWRP:
|
|
case PNPBIOS_BASE:
|
|
/* implement me */
|
|
#endif
|
|
default:
|
|
/* ipmi is supposed to fail here */
|
|
break;
|
|
}
|
|
if (!np)
|
|
return ret;
|
|
parent = of_get_parent(np);
|
|
if (parent) {
|
|
if (strcmp(parent->type, "isa") == 0)
|
|
ret = 0;
|
|
of_node_put(parent);
|
|
}
|
|
of_node_put(np);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(check_legacy_ioport);
|
|
|
|
static int ppc_panic_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
ppc_md.panic(ptr); /* May not return */
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ppc_panic_block = {
|
|
.notifier_call = ppc_panic_event,
|
|
.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);
|
|
}
|
|
|
|
#ifdef CONFIG_CHECK_CACHE_COHERENCY
|
|
/*
|
|
* For platforms that have configurable cache-coherency. This function
|
|
* checks that the cache coherency setting of the kernel matches the setting
|
|
* left by the firmware, as indicated in the device tree. Since a mismatch
|
|
* will eventually result in DMA failures, we print * and error and call
|
|
* BUG() in that case.
|
|
*/
|
|
|
|
#ifdef CONFIG_NOT_COHERENT_CACHE
|
|
#define KERNEL_COHERENCY 0
|
|
#else
|
|
#define KERNEL_COHERENCY 1
|
|
#endif
|
|
|
|
static int __init check_cache_coherency(void)
|
|
{
|
|
struct device_node *np;
|
|
const void *prop;
|
|
int 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;
|
|
|
|
if (devtree_coherency != KERNEL_COHERENCY) {
|
|
printk(KERN_ERR
|
|
"kernel coherency:%s != device tree_coherency:%s\n",
|
|
KERNEL_COHERENCY ? "on" : "off",
|
|
devtree_coherency ? "on" : "off");
|
|
BUG();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(check_cache_coherency);
|
|
#endif /* CONFIG_CHECK_CACHE_COHERENCY */
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
struct dentry *powerpc_debugfs_root;
|
|
|
|
static int powerpc_debugfs_init(void)
|
|
{
|
|
powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
|
|
|
|
return powerpc_debugfs_root == NULL;
|
|
}
|
|
arch_initcall(powerpc_debugfs_init);
|
|
#endif
|