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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m32r/kernel/smpboot.c
downloadconfigs-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/m32r/kernel/smpboot.c')
-rw-r--r--arch/m32r/kernel/smpboot.c630
1 files changed, 630 insertions, 0 deletions
diff --git a/arch/m32r/kernel/smpboot.c b/arch/m32r/kernel/smpboot.c
new file mode 100644
index 00000000000..f9a0e723478
--- /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 <alan@redhat.com>
+ * (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
+ *
+ * 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 <linux/config.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/irq.h>
+#include <linux/bootmem.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+#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;
+}
+