From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/m32r/kernel/smpboot.c | 630 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 630 insertions(+) create mode 100644 arch/m32r/kernel/smpboot.c (limited to 'arch/m32r/kernel/smpboot.c') diff --git a/arch/m32r/kernel/smpboot.c b/arch/m32r/kernel/smpboot.c new file mode 100644 index 000000000000..f9a0e723478d --- /dev/null +++ b/arch/m32r/kernel/smpboot.c @@ -0,0 +1,630 @@ +/* + * linux/arch/m32r/kernel/smpboot.c + * orig : i386 2.4.10 + * + * M32R SMP booting functions + * + * Copyright (c) 2001, 2002, 2003 Hitoshi Yamamoto + * + * Taken from i386 version. + * (c) 1995 Alan Cox, Building #3 + * (c) 1998, 1999, 2000 Ingo Molnar + * + * Much of the core SMP work is based on previous work by Thomas Radke, to + * whom a great many thanks are extended. + * + * Thanks to Intel for making available several different Pentium, + * Pentium Pro and Pentium-II/Xeon MP machines. + * Original development of Linux SMP code supported by Caldera. + * + * This code is released under the GNU General Public License version 2 or + * later. + * + * Fixes + * Felix Koop : NR_CPUS used properly + * Jose Renau : Handle single CPU case. + * Alan Cox : By repeated request + * 8) - Total BogoMIP report. + * Greg Wright : Fix for kernel stacks panic. + * Erich Boleyn : MP v1.4 and additional changes. + * Matthias Sattler : Changes for 2.1 kernel map. + * Michel Lespinasse : Changes for 2.1 kernel map. + * Michael Chastain : Change trampoline.S to gnu as. + * Alan Cox : Dumb bug: 'B' step PPro's are fine + * Ingo Molnar : Added APIC timers, based on code + * from Jose Renau + * Ingo Molnar : various cleanups and rewrites + * Tigran Aivazian : fixed "0.00 in /proc/uptime on SMP" bug. + * Maciej W. Rozycki : Bits for genuine 82489DX APICs + * Martin J. Bligh : Added support for multi-quad systems + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define DEBUG_SMP +#ifdef DEBUG_SMP +#define Dprintk(x...) printk(x) +#else +#define Dprintk(x...) +#endif + +extern cpumask_t cpu_initialized; + +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +/* Data structures and variables */ +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ + +/* Processor that is doing the boot up */ +static unsigned int bsp_phys_id = -1; + +/* Bitmask of physically existing CPUs */ +physid_mask_t phys_cpu_present_map; + +/* Bitmask of currently online CPUs */ +cpumask_t cpu_online_map; + +cpumask_t cpu_bootout_map; +cpumask_t cpu_bootin_map; +cpumask_t cpu_callout_map; +static cpumask_t cpu_callin_map; + +/* Per CPU bogomips and other parameters */ +struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned; + +static int cpucount; +static cpumask_t smp_commenced_mask; + +extern struct { + void * spi; + unsigned short ss; +} stack_start; + +/* which physical physical ID maps to which logical CPU number */ +static volatile int physid_2_cpu[NR_CPUS]; + +/* which logical CPU number maps to which physical ID */ +volatile int cpu_2_physid[NR_CPUS]; + +DEFINE_PER_CPU(int, prof_multiplier) = 1; +DEFINE_PER_CPU(int, prof_old_multiplier) = 1; +DEFINE_PER_CPU(int, prof_counter) = 1; + +spinlock_t ipi_lock[NR_IPIS]; + +static unsigned int calibration_result; + +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +/* Function Prototypes */ +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ + +void smp_prepare_boot_cpu(void); +void smp_prepare_cpus(unsigned int); +static void smp_tune_scheduling(void); +static void init_ipi_lock(void); +static void do_boot_cpu(int); +int __cpu_up(unsigned int); +void smp_cpus_done(unsigned int); + +int start_secondary(void *); +static void smp_callin(void); +static void smp_online(void); + +static void show_mp_info(int); +static void smp_store_cpu_info(int); +static void show_cpu_info(int); +int setup_profiling_timer(unsigned int); +static void init_cpu_to_physid(void); +static void map_cpu_to_physid(int, int); +static void unmap_cpu_to_physid(int, int); + +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +/* Boot up APs Routins : BSP */ +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +void __devinit smp_prepare_boot_cpu(void) +{ + bsp_phys_id = hard_smp_processor_id(); + physid_set(bsp_phys_id, phys_cpu_present_map); + cpu_set(0, cpu_online_map); /* BSP's cpu_id == 0 */ + cpu_set(0, cpu_callout_map); + cpu_set(0, cpu_callin_map); + + /* + * Initialize the logical to physical CPU number mapping + */ + init_cpu_to_physid(); + map_cpu_to_physid(0, bsp_phys_id); + current_thread_info()->cpu = 0; +} + +/*==========================================================================* + * Name: smp_prepare_cpus (old smp_boot_cpus) + * + * Description: This routine boot up APs. + * + * Born on Date: 2002.02.05 + * + * Arguments: NONE + * + * Returns: void (cannot fail) + * + * Modification log: + * Date Who Description + * ---------- --- -------------------------------------------------------- + * 2003-06-24 hy modify for linux-2.5.69 + * + *==========================================================================*/ +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + int phys_id; + unsigned long nr_cpu; + + nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL); + if (nr_cpu > NR_CPUS) { + printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]", + nr_cpu, NR_CPUS); + goto smp_done; + } + for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++) + physid_set(phys_id, phys_cpu_present_map); + + show_mp_info(nr_cpu); + + init_ipi_lock(); + + /* + * Setup boot CPU information + */ + smp_store_cpu_info(0); /* Final full version of the data */ + smp_tune_scheduling(); + + /* + * If SMP should be disabled, then really disable it! + */ + if (!max_cpus) { + printk(KERN_INFO "SMP mode deactivated by commandline.\n"); + goto smp_done; + } + + /* + * Now scan the CPU present map and fire up the other CPUs. + */ + Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map)); + + for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) { + /* + * Don't even attempt to start the boot CPU! + */ + if (phys_id == bsp_phys_id) + continue; + + if (!physid_isset(phys_id, phys_cpu_present_map)) + continue; + + if ((max_cpus >= 0) && (max_cpus <= cpucount + 1)) + continue; + + do_boot_cpu(phys_id); + + /* + * Make sure we unmap all failed CPUs + */ + if (physid_to_cpu(phys_id) == -1) { + physid_clear(phys_id, phys_cpu_present_map); + printk("phys CPU#%d not responding - " \ + "cannot use it.\n", phys_id); + } + } + +smp_done: + Dprintk("Boot done.\n"); +} + +static void __init smp_tune_scheduling(void) +{ + /* Nothing to do. */ +} + +/* + * init_ipi_lock : Initialize IPI locks. + */ +static void __init init_ipi_lock(void) +{ + int ipi; + + for (ipi = 0 ; ipi < NR_IPIS ; ipi++) + spin_lock_init(&ipi_lock[ipi]); +} + +/*==========================================================================* + * Name: do_boot_cpu + * + * Description: This routine boot up one AP. + * + * Born on Date: 2002.02.05 + * + * Arguments: phys_id - Target CPU physical ID + * + * Returns: void (cannot fail) + * + * Modification log: + * Date Who Description + * ---------- --- -------------------------------------------------------- + * 2003-06-24 hy modify for linux-2.5.69 + * + *==========================================================================*/ +static void __init do_boot_cpu(int phys_id) +{ + struct task_struct *idle; + unsigned long send_status, boot_status; + int timeout, cpu_id; + + cpu_id = ++cpucount; + + /* + * We can't use kernel_thread since we must avoid to + * reschedule the child. + */ + idle = fork_idle(cpu_id); + if (IS_ERR(idle)) + panic("failed fork for CPU#%d.", cpu_id); + + idle->thread.lr = (unsigned long)start_secondary; + + map_cpu_to_physid(cpu_id, phys_id); + + /* So we see what's up */ + printk("Booting processor %d/%d\n", phys_id, cpu_id); + stack_start.spi = (void *)idle->thread.sp; + idle->thread_info->cpu = cpu_id; + + /* + * Send Startup IPI + * 1.IPI received by CPU#(phys_id). + * 2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S) + * 3.CPU#(phys_id) enter start_secondary() + */ + send_status = 0; + boot_status = 0; + + cpu_set(phys_id, cpu_bootout_map); + + /* Send Startup IPI */ + send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0); + + Dprintk("Waiting for send to finish...\n"); + timeout = 0; + + /* Wait 100[ms] */ + do { + Dprintk("+"); + udelay(1000); + send_status = !cpu_isset(phys_id, cpu_bootin_map); + } while (send_status && (timeout++ < 100)); + + Dprintk("After Startup.\n"); + + if (!send_status) { + /* + * allow APs to start initializing. + */ + Dprintk("Before Callout %d.\n", cpu_id); + cpu_set(cpu_id, cpu_callout_map); + Dprintk("After Callout %d.\n", cpu_id); + + /* + * Wait 5s total for a response + */ + for (timeout = 0; timeout < 5000; timeout++) { + if (cpu_isset(cpu_id, cpu_callin_map)) + break; /* It has booted */ + udelay(1000); + } + + if (cpu_isset(cpu_id, cpu_callin_map)) { + /* number CPUs logically, starting from 1 (BSP is 0) */ + Dprintk("OK.\n"); + } else { + boot_status = 1; + printk("Not responding.\n"); + } + } else + printk("IPI never delivered???\n"); + + if (send_status || boot_status) { + unmap_cpu_to_physid(cpu_id, phys_id); + cpu_clear(cpu_id, cpu_callout_map); + cpu_clear(cpu_id, cpu_callin_map); + cpu_clear(cpu_id, cpu_initialized); + cpucount--; + } +} + +int __devinit __cpu_up(unsigned int cpu_id) +{ + int timeout; + + cpu_set(cpu_id, smp_commenced_mask); + + /* + * Wait 5s total for a response + */ + for (timeout = 0; timeout < 5000; timeout++) { + if (cpu_isset(cpu_id, cpu_online_map)) + break; + udelay(1000); + } + if (!cpu_isset(cpu_id, cpu_online_map)) + BUG(); + + return 0; +} + +void __init smp_cpus_done(unsigned int max_cpus) +{ + int cpu_id, timeout; + unsigned long bogosum = 0; + + for (timeout = 0; timeout < 5000; timeout++) { + if (cpus_equal(cpu_callin_map, cpu_online_map)) + break; + udelay(1000); + } + if (!cpus_equal(cpu_callin_map, cpu_online_map)) + BUG(); + + for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++) + show_cpu_info(cpu_id); + + /* + * Allow the user to impress friends. + */ + Dprintk("Before bogomips.\n"); + if (cpucount) { + for_each_cpu_mask(cpu_id, cpu_online_map) + bogosum += cpu_data[cpu_id].loops_per_jiffy; + + printk(KERN_INFO "Total of %d processors activated " \ + "(%lu.%02lu BogoMIPS).\n", cpucount + 1, + bogosum / (500000 / HZ), + (bogosum / (5000 / HZ)) % 100); + Dprintk("Before bogocount - setting activated=1.\n"); + } +} + +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +/* Activate a secondary processor Routins */ +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ + +/*==========================================================================* + * Name: start_secondary + * + * Description: This routine activate a secondary processor. + * + * Born on Date: 2002.02.05 + * + * Arguments: *unused - currently unused. + * + * Returns: void (cannot fail) + * + * Modification log: + * Date Who Description + * ---------- --- -------------------------------------------------------- + * 2003-06-24 hy modify for linux-2.5.69 + * + *==========================================================================*/ +int __init start_secondary(void *unused) +{ + cpu_init(); + smp_callin(); + while (!cpu_isset(smp_processor_id(), smp_commenced_mask)) + cpu_relax(); + + smp_online(); + + /* + * low-memory mappings have been cleared, flush them from + * the local TLBs too. + */ + local_flush_tlb_all(); + + cpu_idle(); + return 0; +} + +/*==========================================================================* + * Name: smp_callin + * + * Description: This routine activate a secondary processor. + * + * Born on Date: 2002.02.05 + * + * Arguments: NONE + * + * Returns: void (cannot fail) + * + * Modification log: + * Date Who Description + * ---------- --- -------------------------------------------------------- + * 2003-06-24 hy modify for linux-2.5.69 + * + *==========================================================================*/ +static void __init smp_callin(void) +{ + int phys_id = hard_smp_processor_id(); + int cpu_id = smp_processor_id(); + unsigned long timeout; + + if (cpu_isset(cpu_id, cpu_callin_map)) { + printk("huh, phys CPU#%d, CPU#%d already present??\n", + phys_id, cpu_id); + BUG(); + } + Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id); + + /* Waiting 2s total for startup (udelay is not yet working) */ + timeout = jiffies + (2 * HZ); + while (time_before(jiffies, timeout)) { + /* Has the boot CPU finished it's STARTUP sequence ? */ + if (cpu_isset(cpu_id, cpu_callout_map)) + break; + cpu_relax(); + } + + if (!time_before(jiffies, timeout)) { + printk("BUG: CPU#%d started up but did not get a callout!\n", + cpu_id); + BUG(); + } + + /* Allow the master to continue. */ + cpu_set(cpu_id, cpu_callin_map); +} + +static void __init smp_online(void) +{ + int cpu_id = smp_processor_id(); + + local_irq_enable(); + + /* Get our bogomips. */ + calibrate_delay(); + + /* Save our processor parameters */ + smp_store_cpu_info(cpu_id); + + cpu_set(cpu_id, cpu_online_map); +} + +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +/* Boot up CPUs common Routins */ +/*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/ +static void __init show_mp_info(int nr_cpu) +{ + int i; + char cpu_model0[17], cpu_model1[17], cpu_ver[9]; + + strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16); + strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16); + strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8); + + cpu_model0[16] = '\0'; + for (i = 15 ; i >= 0 ; i--) { + if (cpu_model0[i] != ' ') + break; + cpu_model0[i] = '\0'; + } + cpu_model1[16] = '\0'; + for (i = 15 ; i >= 0 ; i--) { + if (cpu_model1[i] != ' ') + break; + cpu_model1[i] = '\0'; + } + cpu_ver[8] = '\0'; + for (i = 7 ; i >= 0 ; i--) { + if (cpu_ver[i] != ' ') + break; + cpu_ver[i] = '\0'; + } + + printk(KERN_INFO "M32R-mp information\n"); + printk(KERN_INFO " On-chip CPUs : %d\n", nr_cpu); + printk(KERN_INFO " CPU model : %s/%s(%s)\n", cpu_model0, + cpu_model1, cpu_ver); +} + +/* + * 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) +{ + 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 (i = 0; i < NR_CPUS; ++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; +} + -- cgit v1.2.3