![Rusty Russell](/assets/img/avatar_default.png)
This may be OK in archs with contiguous CPU numbers and without hotplug CPUs, but it sets a terrible example. And open-coding it like drivers/scsi/hpsa.c is just weird. BTRFS has a weird comparison with num_online_cpus() too, but since BTRFS just screwed up my test machines' root partition, I'm not touching it :) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reported-by: Oleg Drokin <green@linuxhacker.ru>
627 lines
16 KiB
C
627 lines
16 KiB
C
/*
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* linux/arch/m32r/kernel/smpboot.c
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* orig : i386 2.4.10
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*
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* M32R SMP booting functions
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*
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* Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto
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*
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* Taken from i386 version.
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* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
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* (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
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*
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* Much of the core SMP work is based on previous work by Thomas Radke, to
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* whom a great many thanks are extended.
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*
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* Thanks to Intel for making available several different Pentium,
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* Pentium Pro and Pentium-II/Xeon MP machines.
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* Original development of Linux SMP code supported by Caldera.
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*
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* This code is released under the GNU General Public License version 2 or
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* later.
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*
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* Fixes
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* Felix Koop : NR_CPUS used properly
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* Jose Renau : Handle single CPU case.
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* Alan Cox : By repeated request
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* 8) - Total BogoMIP report.
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* Greg Wright : Fix for kernel stacks panic.
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* Erich Boleyn : MP v1.4 and additional changes.
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* Matthias Sattler : Changes for 2.1 kernel map.
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* Michel Lespinasse : Changes for 2.1 kernel map.
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* Michael Chastain : Change trampoline.S to gnu as.
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* Alan Cox : Dumb bug: 'B' step PPro's are fine
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* Ingo Molnar : Added APIC timers, based on code
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* from Jose Renau
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* Ingo Molnar : various cleanups and rewrites
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* Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug.
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* Maciej W. Rozycki : Bits for genuine 82489DX APICs
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* Martin J. Bligh : Added support for multi-quad systems
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*/
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/irq.h>
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#include <linux/bootmem.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#define DEBUG_SMP
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#ifdef DEBUG_SMP
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#define Dprintk(x...) printk(x)
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#else
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#define Dprintk(x...)
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#endif
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extern cpumask_t cpu_initialized;
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Data structures and variables */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Processor that is doing the boot up */
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static unsigned int bsp_phys_id = -1;
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/* Bitmask of physically existing CPUs */
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physid_mask_t phys_cpu_present_map;
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cpumask_t cpu_bootout_map;
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cpumask_t cpu_bootin_map;
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static cpumask_t cpu_callin_map;
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cpumask_t cpu_callout_map;
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EXPORT_SYMBOL(cpu_callout_map);
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/* Per CPU bogomips and other parameters */
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struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
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static int cpucount;
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static cpumask_t smp_commenced_mask;
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extern struct {
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void * spi;
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unsigned short ss;
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} stack_start;
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/* which physical physical ID maps to which logical CPU number */
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static volatile int physid_2_cpu[NR_CPUS];
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#define physid_to_cpu(physid) physid_2_cpu[physid]
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/* which logical CPU number maps to which physical ID */
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volatile int cpu_2_physid[NR_CPUS];
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DEFINE_PER_CPU(int, prof_multiplier) = 1;
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DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
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DEFINE_PER_CPU(int, prof_counter) = 1;
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spinlock_t ipi_lock[NR_IPIS];
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static unsigned int calibration_result;
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Function Prototypes */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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static void init_ipi_lock(void);
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static void do_boot_cpu(int);
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int start_secondary(void *);
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static void smp_callin(void);
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static void smp_online(void);
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static void show_mp_info(int);
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static void smp_store_cpu_info(int);
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static void show_cpu_info(int);
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int setup_profiling_timer(unsigned int);
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static void init_cpu_to_physid(void);
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static void map_cpu_to_physid(int, int);
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static void unmap_cpu_to_physid(int, int);
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Boot up APs Routines : BSP */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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void smp_prepare_boot_cpu(void)
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{
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bsp_phys_id = hard_smp_processor_id();
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physid_set(bsp_phys_id, phys_cpu_present_map);
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set_cpu_online(0, true); /* BSP's cpu_id == 0 */
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cpumask_set_cpu(0, &cpu_callout_map);
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cpumask_set_cpu(0, &cpu_callin_map);
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/*
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* Initialize the logical to physical CPU number mapping
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*/
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init_cpu_to_physid();
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map_cpu_to_physid(0, bsp_phys_id);
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current_thread_info()->cpu = 0;
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}
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/*==========================================================================*
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* Name: smp_prepare_cpus (old smp_boot_cpus)
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*
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* Description: This routine boot up APs.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: NONE
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*
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* Returns: void (cannot fail)
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*
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* Modification log:
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* Date Who Description
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* ---------- --- --------------------------------------------------------
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* 2003-06-24 hy modify for linux-2.5.69
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*
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*==========================================================================*/
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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int phys_id;
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unsigned long nr_cpu;
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nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
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if (nr_cpu > NR_CPUS) {
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printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
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nr_cpu, NR_CPUS);
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goto smp_done;
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}
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for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
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physid_set(phys_id, phys_cpu_present_map);
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#ifndef CONFIG_HOTPLUG_CPU
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init_cpu_present(cpu_possible_mask);
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#endif
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show_mp_info(nr_cpu);
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init_ipi_lock();
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/*
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* Setup boot CPU information
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*/
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smp_store_cpu_info(0); /* Final full version of the data */
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/*
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* If SMP should be disabled, then really disable it!
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*/
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if (!max_cpus) {
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printk(KERN_INFO "SMP mode deactivated by commandline.\n");
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goto smp_done;
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}
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/*
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* Now scan the CPU present map and fire up the other CPUs.
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*/
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Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
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for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
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/*
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* Don't even attempt to start the boot CPU!
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*/
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if (phys_id == bsp_phys_id)
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continue;
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if (!physid_isset(phys_id, phys_cpu_present_map))
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continue;
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if (max_cpus <= cpucount + 1)
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continue;
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do_boot_cpu(phys_id);
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/*
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* Make sure we unmap all failed CPUs
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*/
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if (physid_to_cpu(phys_id) == -1) {
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physid_clear(phys_id, phys_cpu_present_map);
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printk("phys CPU#%d not responding - " \
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"cannot use it.\n", phys_id);
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}
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}
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smp_done:
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Dprintk("Boot done.\n");
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}
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/*
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* init_ipi_lock : Initialize IPI locks.
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*/
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static void __init init_ipi_lock(void)
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{
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int ipi;
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for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
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spin_lock_init(&ipi_lock[ipi]);
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}
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/*==========================================================================*
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* Name: do_boot_cpu
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*
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* Description: This routine boot up one AP.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: phys_id - Target CPU physical ID
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*
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* Returns: void (cannot fail)
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*
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* Modification log:
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* Date Who Description
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* ---------- --- --------------------------------------------------------
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* 2003-06-24 hy modify for linux-2.5.69
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*
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*==========================================================================*/
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static void __init do_boot_cpu(int phys_id)
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{
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struct task_struct *idle;
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unsigned long send_status, boot_status;
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int timeout, cpu_id;
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cpu_id = ++cpucount;
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/*
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* We can't use kernel_thread since we must avoid to
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* reschedule the child.
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*/
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idle = fork_idle(cpu_id);
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if (IS_ERR(idle))
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panic("failed fork for CPU#%d.", cpu_id);
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idle->thread.lr = (unsigned long)start_secondary;
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map_cpu_to_physid(cpu_id, phys_id);
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/* So we see what's up */
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printk("Booting processor %d/%d\n", phys_id, cpu_id);
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stack_start.spi = (void *)idle->thread.sp;
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task_thread_info(idle)->cpu = cpu_id;
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/*
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* Send Startup IPI
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* 1.IPI received by CPU#(phys_id).
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* 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
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* 3.CPU#(phys_id) enter start_secondary()
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*/
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send_status = 0;
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boot_status = 0;
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cpumask_set_cpu(phys_id, &cpu_bootout_map);
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/* Send Startup IPI */
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send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
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Dprintk("Waiting for send to finish...\n");
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timeout = 0;
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/* Wait 100[ms] */
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do {
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Dprintk("+");
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udelay(1000);
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send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
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} while (send_status && (timeout++ < 100));
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Dprintk("After Startup.\n");
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if (!send_status) {
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/*
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* allow APs to start initializing.
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*/
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Dprintk("Before Callout %d.\n", cpu_id);
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cpumask_set_cpu(cpu_id, &cpu_callout_map);
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Dprintk("After Callout %d.\n", cpu_id);
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/*
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* Wait 5s total for a response
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*/
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for (timeout = 0; timeout < 5000; timeout++) {
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if (cpumask_test_cpu(cpu_id, &cpu_callin_map))
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break; /* It has booted */
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udelay(1000);
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}
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if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
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/* number CPUs logically, starting from 1 (BSP is 0) */
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Dprintk("OK.\n");
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} else {
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boot_status = 1;
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printk("Not responding.\n");
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}
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} else
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printk("IPI never delivered???\n");
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if (send_status || boot_status) {
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unmap_cpu_to_physid(cpu_id, phys_id);
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cpumask_clear_cpu(cpu_id, &cpu_callout_map);
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cpumask_clear_cpu(cpu_id, &cpu_callin_map);
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cpumask_clear_cpu(cpu_id, &cpu_initialized);
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cpucount--;
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}
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}
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int __cpu_up(unsigned int cpu_id, struct task_struct *tidle)
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{
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int timeout;
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cpumask_set_cpu(cpu_id, &smp_commenced_mask);
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/*
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* Wait 5s total for a response
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*/
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for (timeout = 0; timeout < 5000; timeout++) {
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if (cpu_online(cpu_id))
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break;
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udelay(1000);
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}
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if (!cpu_online(cpu_id))
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BUG();
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return 0;
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}
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void __init smp_cpus_done(unsigned int max_cpus)
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{
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int cpu_id, timeout;
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unsigned long bogosum = 0;
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for (timeout = 0; timeout < 5000; timeout++) {
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if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
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break;
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udelay(1000);
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}
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if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
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BUG();
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for_each_online_cpu(cpu_id)
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show_cpu_info(cpu_id);
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/*
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* Allow the user to impress friends.
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*/
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Dprintk("Before bogomips.\n");
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if (cpucount) {
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for_each_cpu(cpu_id,cpu_online_mask)
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bogosum += cpu_data[cpu_id].loops_per_jiffy;
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printk(KERN_INFO "Total of %d processors activated " \
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"(%lu.%02lu BogoMIPS).\n", cpucount + 1,
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bogosum / (500000 / HZ),
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(bogosum / (5000 / HZ)) % 100);
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Dprintk("Before bogocount - setting activated=1.\n");
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}
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}
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Activate a secondary processor Routines */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/*==========================================================================*
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* Name: start_secondary
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*
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* Description: This routine activate a secondary processor.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: *unused - currently unused.
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*
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* Returns: void (cannot fail)
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*
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* Modification log:
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* Date Who Description
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* ---------- --- --------------------------------------------------------
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* 2003-06-24 hy modify for linux-2.5.69
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*
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*==========================================================================*/
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int __init start_secondary(void *unused)
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{
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cpu_init();
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preempt_disable();
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smp_callin();
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while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
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cpu_relax();
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smp_online();
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/*
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* low-memory mappings have been cleared, flush them from
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* the local TLBs too.
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*/
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local_flush_tlb_all();
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cpu_startup_entry(CPUHP_ONLINE);
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return 0;
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}
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/*==========================================================================*
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* Name: smp_callin
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*
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* Description: This routine activate a secondary processor.
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*
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* Born on Date: 2002.02.05
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*
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* Arguments: NONE
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*
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* Returns: void (cannot fail)
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*
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* Modification log:
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* Date Who Description
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* ---------- --- --------------------------------------------------------
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* 2003-06-24 hy modify for linux-2.5.69
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*
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*==========================================================================*/
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static void __init smp_callin(void)
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{
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int phys_id = hard_smp_processor_id();
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int cpu_id = smp_processor_id();
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unsigned long timeout;
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if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
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printk("huh, phys CPU#%d, CPU#%d already present??\n",
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phys_id, cpu_id);
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BUG();
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}
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Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
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/* Waiting 2s total for startup (udelay is not yet working) */
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timeout = jiffies + (2 * HZ);
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while (time_before(jiffies, timeout)) {
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/* Has the boot CPU finished it's STARTUP sequence ? */
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if (cpumask_test_cpu(cpu_id, &cpu_callout_map))
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break;
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cpu_relax();
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}
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if (!time_before(jiffies, timeout)) {
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printk("BUG: CPU#%d started up but did not get a callout!\n",
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cpu_id);
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BUG();
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}
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/* Allow the master to continue. */
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cpumask_set_cpu(cpu_id, &cpu_callin_map);
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}
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static void __init smp_online(void)
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{
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int cpu_id = smp_processor_id();
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notify_cpu_starting(cpu_id);
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local_irq_enable();
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/* Get our bogomips. */
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calibrate_delay();
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/* Save our processor parameters */
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smp_store_cpu_info(cpu_id);
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set_cpu_online(cpu_id, true);
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}
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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/* Boot up CPUs common Routines */
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/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
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static void __init show_mp_info(int nr_cpu)
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|
{
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|
int i;
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char cpu_model0[17], cpu_model1[17], cpu_ver[9];
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|
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|
strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
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strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
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strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
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|
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|
cpu_model0[16] = '\0';
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for (i = 15 ; i >= 0 ; i--) {
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|
if (cpu_model0[i] != ' ')
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|
break;
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|
cpu_model0[i] = '\0';
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|
}
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|
cpu_model1[16] = '\0';
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|
for (i = 15 ; i >= 0 ; i--) {
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|
if (cpu_model1[i] != ' ')
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|
break;
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|
cpu_model1[i] = '\0';
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|
}
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|
cpu_ver[8] = '\0';
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|
for (i = 7 ; i >= 0 ; i--) {
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|
if (cpu_ver[i] != ' ')
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|
break;
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|
cpu_ver[i] = '\0';
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|
}
|
|
|
|
printk(KERN_INFO "M32R-mp information\n");
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|
printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu);
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|
printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0,
|
|
cpu_model1, cpu_ver);
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|
}
|
|
|
|
/*
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|
* The bootstrap kernel entry code has set these up. Save them for
|
|
* a given CPU
|
|
*/
|
|
static void __init smp_store_cpu_info(int cpu_id)
|
|
{
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|
struct cpuinfo_m32r *ci = cpu_data + cpu_id;
|
|
|
|
*ci = boot_cpu_data;
|
|
ci->loops_per_jiffy = loops_per_jiffy;
|
|
}
|
|
|
|
static void __init show_cpu_info(int cpu_id)
|
|
{
|
|
struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
|
|
|
|
printk("CPU#%d : ", cpu_id);
|
|
|
|
#define PRINT_CLOCK(name, value) \
|
|
printk(name " clock %d.%02dMHz", \
|
|
((value) / 1000000), ((value) % 1000000) / 10000)
|
|
|
|
PRINT_CLOCK("CPU", (int)ci->cpu_clock);
|
|
PRINT_CLOCK(", Bus", (int)ci->bus_clock);
|
|
printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
|
|
}
|
|
|
|
/*
|
|
* the frequency of the profiling timer can be changed
|
|
* by writing a multiplier value into /proc/profile.
|
|
*/
|
|
int setup_profiling_timer(unsigned int multiplier)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Sanity check. [at least 500 APIC cycles should be
|
|
* between APIC interrupts as a rule of thumb, to avoid
|
|
* irqs flooding us]
|
|
*/
|
|
if ( (!multiplier) || (calibration_result / multiplier < 500))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Set the new multiplier for each CPU. CPUs don't start using the
|
|
* new values until the next timer interrupt in which they do process
|
|
* accounting. At that time they also adjust their APIC timers
|
|
* accordingly.
|
|
*/
|
|
for_each_possible_cpu(i)
|
|
per_cpu(prof_multiplier, i) = multiplier;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize all maps between cpu number and apicids */
|
|
static void __init init_cpu_to_physid(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < NR_CPUS ; i++) {
|
|
cpu_2_physid[i] = -1;
|
|
physid_2_cpu[i] = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
|
|
* else physical apic ids
|
|
*/
|
|
static void __init map_cpu_to_physid(int cpu_id, int phys_id)
|
|
{
|
|
physid_2_cpu[phys_id] = cpu_id;
|
|
cpu_2_physid[cpu_id] = phys_id;
|
|
}
|
|
|
|
/*
|
|
* undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
|
|
* else physical apic ids
|
|
*/
|
|
static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
|
|
{
|
|
physid_2_cpu[phys_id] = -1;
|
|
cpu_2_physid[cpu_id] = -1;
|
|
}
|