ARM: tegra3: initialize pll_a during boot
[linux-2.6.git] / kernel / profile.c
index 04fd84e..961b389 100644 (file)
 #include <linux/mm.h>
 #include <linux/cpumask.h>
 #include <linux/cpu.h>
-#include <linux/profile.h>
 #include <linux/highmem.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
 #include <asm/sections.h>
-#include <asm/semaphore.h>
 #include <asm/irq_regs.h>
+#include <asm/ptrace.h>
 
 struct profile_hit {
        u32 pc, hits;
@@ -36,25 +37,30 @@ struct profile_hit {
 #define NR_PROFILE_GRP         (NR_PROFILE_HIT/PROFILE_GRPSZ)
 
 /* Oprofile timer tick hook */
-int (*timer_hook)(struct pt_regs *) __read_mostly;
+static int (*timer_hook)(struct pt_regs *) __read_mostly;
 
 static atomic_t *prof_buffer;
 static unsigned long prof_len, prof_shift;
+
 int prof_on __read_mostly;
-static cpumask_t prof_cpu_mask = CPU_MASK_ALL;
+EXPORT_SYMBOL_GPL(prof_on);
+
+static cpumask_var_t prof_cpu_mask;
 #ifdef CONFIG_SMP
 static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits);
 static DEFINE_PER_CPU(int, cpu_profile_flip);
 static DEFINE_MUTEX(profile_flip_mutex);
 #endif /* CONFIG_SMP */
 
-static int __init profile_setup(char * str)
+int profile_setup(char *str)
 {
-       static char __initdata schedstr[] = "schedule";
-       static char __initdata sleepstr[] = "sleep";
+       static char schedstr[] = "schedule";
+       static char sleepstr[] = "sleep";
+       static char kvmstr[] = "kvm";
        int par;
 
        if (!strncmp(str, sleepstr, strlen(sleepstr))) {
+#ifdef CONFIG_SCHEDSTATS
                prof_on = SLEEP_PROFILING;
                if (str[strlen(sleepstr)] == ',')
                        str += strlen(sleepstr) + 1;
@@ -63,7 +69,11 @@ static int __init profile_setup(char * str)
                printk(KERN_INFO
                        "kernel sleep profiling enabled (shift: %ld)\n",
                        prof_shift);
-       } else if (!strncmp(str, sleepstr, strlen(sleepstr))) {
+#else
+               printk(KERN_WARNING
+                       "kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
+#endif /* CONFIG_SCHEDSTATS */
+       } else if (!strncmp(str, schedstr, strlen(schedstr))) {
                prof_on = SCHED_PROFILING;
                if (str[strlen(schedstr)] == ',')
                        str += strlen(schedstr) + 1;
@@ -72,6 +82,15 @@ static int __init profile_setup(char * str)
                printk(KERN_INFO
                        "kernel schedule profiling enabled (shift: %ld)\n",
                        prof_shift);
+       } else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
+               prof_on = KVM_PROFILING;
+               if (str[strlen(kvmstr)] == ',')
+                       str += strlen(kvmstr) + 1;
+               if (get_option(&str, &par))
+                       prof_shift = par;
+               printk(KERN_INFO
+                       "kernel KVM profiling enabled (shift: %ld)\n",
+                       prof_shift);
        } else if (get_option(&str, &par)) {
                prof_shift = par;
                prof_on = CPU_PROFILING;
@@ -83,30 +102,50 @@ static int __init profile_setup(char * str)
 __setup("profile=", profile_setup);
 
 
-void __init profile_init(void)
+int __ref profile_init(void)
 {
-       if (!prof_on) 
-               return;
+       int buffer_bytes;
+       if (!prof_on)
+               return 0;
+
        /* only text is profiled */
        prof_len = (_etext - _stext) >> prof_shift;
-       prof_buffer = alloc_bootmem(prof_len*sizeof(atomic_t));
+       buffer_bytes = prof_len*sizeof(atomic_t);
+
+       if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
+               return -ENOMEM;
+
+       cpumask_copy(prof_cpu_mask, cpu_possible_mask);
+
+       prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL|__GFP_NOWARN);
+       if (prof_buffer)
+               return 0;
+
+       prof_buffer = alloc_pages_exact(buffer_bytes,
+                                       GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
+       if (prof_buffer)
+               return 0;
+
+       prof_buffer = vzalloc(buffer_bytes);
+       if (prof_buffer)
+               return 0;
+
+       free_cpumask_var(prof_cpu_mask);
+       return -ENOMEM;
 }
 
 /* Profile event notifications */
-#ifdef CONFIG_PROFILING
+
 static BLOCKING_NOTIFIER_HEAD(task_exit_notifier);
 static ATOMIC_NOTIFIER_HEAD(task_free_notifier);
 static BLOCKING_NOTIFIER_HEAD(munmap_notifier);
-void profile_task_exit(struct task_struct * task)
+
+void profile_task_exit(struct task_struct *task)
 {
        blocking_notifier_call_chain(&task_exit_notifier, 0, task);
 }
-int profile_handoff_task(struct task_struct * task)
+
+int profile_handoff_task(struct task_struct *task)
 {
        int ret;
        ret = atomic_notifier_call_chain(&task_free_notifier, 0, task);
@@ -118,52 +157,55 @@ void profile_munmap(unsigned long addr)
        blocking_notifier_call_chain(&munmap_notifier, 0, (void *)addr);
 }
 
-int task_handoff_register(struct notifier_block * n)
+int task_handoff_register(struct notifier_block *n)
 {
        return atomic_notifier_chain_register(&task_free_notifier, n);
 }
+EXPORT_SYMBOL_GPL(task_handoff_register);
 
-int task_handoff_unregister(struct notifier_block * n)
+int task_handoff_unregister(struct notifier_block *n)
 {
        return atomic_notifier_chain_unregister(&task_free_notifier, n);
 }
+EXPORT_SYMBOL_GPL(task_handoff_unregister);
 
-int profile_event_register(enum profile_type type, struct notifier_block * n)
+int profile_event_register(enum profile_type type, struct notifier_block *n)
 {
        int err = -EINVAL;
+
        switch (type) {
-               case PROFILE_TASK_EXIT:
-                       err = blocking_notifier_chain_register(
-                                       &task_exit_notifier, n);
-                       break;
-               case PROFILE_MUNMAP:
-                       err = blocking_notifier_chain_register(
-                                       &munmap_notifier, n);
-                       break;
+       case PROFILE_TASK_EXIT:
+               err = blocking_notifier_chain_register(
+                               &task_exit_notifier, n);
+               break;
+       case PROFILE_MUNMAP:
+               err = blocking_notifier_chain_register(
+                               &munmap_notifier, n);
+               break;
        }
+
        return err;
 }
+EXPORT_SYMBOL_GPL(profile_event_register);
 
-int profile_event_unregister(enum profile_type type, struct notifier_block * n)
+int profile_event_unregister(enum profile_type type, struct notifier_block *n)
 {
        int err = -EINVAL;
+
        switch (type) {
-               case PROFILE_TASK_EXIT:
-                       err = blocking_notifier_chain_unregister(
-                                       &task_exit_notifier, n);
-                       break;
-               case PROFILE_MUNMAP:
-                       err = blocking_notifier_chain_unregister(
-                                       &munmap_notifier, n);
-                       break;
+       case PROFILE_TASK_EXIT:
+               err = blocking_notifier_chain_unregister(
+                               &task_exit_notifier, n);
+               break;
+       case PROFILE_MUNMAP:
+               err = blocking_notifier_chain_unregister(
+                               &munmap_notifier, n);
+               break;
        }
 
        return err;
 }
+EXPORT_SYMBOL_GPL(profile_event_unregister);
 
 int register_timer_hook(int (*hook)(struct pt_regs *))
 {
@@ -172,6 +214,7 @@ int register_timer_hook(int (*hook)(struct pt_regs *))
        timer_hook = hook;
        return 0;
 }
+EXPORT_SYMBOL_GPL(register_timer_hook);
 
 void unregister_timer_hook(int (*hook)(struct pt_regs *))
 {
@@ -180,16 +223,8 @@ void unregister_timer_hook(int (*hook)(struct pt_regs *))
        /* make sure all CPUs see the NULL hook */
        synchronize_sched();  /* Allow ongoing interrupts to complete. */
 }
-
-EXPORT_SYMBOL_GPL(register_timer_hook);
 EXPORT_SYMBOL_GPL(unregister_timer_hook);
-EXPORT_SYMBOL_GPL(task_handoff_register);
-EXPORT_SYMBOL_GPL(task_handoff_unregister);
 
-#endif /* CONFIG_PROFILING */
-
-EXPORT_SYMBOL_GPL(profile_event_register);
-EXPORT_SYMBOL_GPL(profile_event_unregister);
 
 #ifdef CONFIG_SMP
 /*
@@ -237,7 +272,7 @@ static void profile_flip_buffers(void)
        mutex_lock(&profile_flip_mutex);
        j = per_cpu(cpu_profile_flip, get_cpu());
        put_cpu();
-       on_each_cpu(__profile_flip_buffers, NULL, 0, 1);
+       on_each_cpu(__profile_flip_buffers, NULL, 1);
        for_each_online_cpu(cpu) {
                struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[j];
                for (i = 0; i < NR_PROFILE_HIT; ++i) {
@@ -260,7 +295,7 @@ static void profile_discard_flip_buffers(void)
        mutex_lock(&profile_flip_mutex);
        i = per_cpu(cpu_profile_flip, get_cpu());
        put_cpu();
-       on_each_cpu(__profile_flip_buffers, NULL, 0, 1);
+       on_each_cpu(__profile_flip_buffers, NULL, 1);
        for_each_online_cpu(cpu) {
                struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[i];
                memset(hits, 0, NR_PROFILE_HIT*sizeof(struct profile_hit));
@@ -268,14 +303,12 @@ static void profile_discard_flip_buffers(void)
        mutex_unlock(&profile_flip_mutex);
 }
 
-void profile_hits(int type, void *__pc, unsigned int nr_hits)
+static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
 {
        unsigned long primary, secondary, flags, pc = (unsigned long)__pc;
        int i, j, cpu;
        struct profile_hit *hits;
 
-       if (prof_on != type || !prof_buffer)
-               return;
        pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1);
        i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
        secondary = (~(pc << 1) & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
@@ -319,8 +352,7 @@ out:
        put_cpu();
 }
 
-#ifdef CONFIG_HOTPLUG_CPU
-static int __devinit profile_cpu_callback(struct notifier_block *info,
+static int __cpuinit profile_cpu_callback(struct notifier_block *info,
                                        unsigned long action, void *__cpu)
 {
        int node, cpu = (unsigned long)__cpu;
@@ -328,36 +360,42 @@ static int __devinit profile_cpu_callback(struct notifier_block *info,
 
        switch (action) {
        case CPU_UP_PREPARE:
-               node = cpu_to_node(cpu);
+       case CPU_UP_PREPARE_FROZEN:
+               node = cpu_to_mem(cpu);
                per_cpu(cpu_profile_flip, cpu) = 0;
                if (!per_cpu(cpu_profile_hits, cpu)[1]) {
-                       page = alloc_pages_node(node,
-                                       GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
+                       page = alloc_pages_exact_node(node,
+                                       GFP_KERNEL | __GFP_ZERO,
                                        0);
                        if (!page)
-                               return NOTIFY_BAD;
+                               return notifier_from_errno(-ENOMEM);
                        per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
                }
                if (!per_cpu(cpu_profile_hits, cpu)[0]) {
-                       page = alloc_pages_node(node,
-                                       GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
+                       page = alloc_pages_exact_node(node,
+                                       GFP_KERNEL | __GFP_ZERO,
                                        0);
                        if (!page)
                                goto out_free;
                        per_cpu(cpu_profile_hits, cpu)[0] = page_address(page);
                }
                break;
-       out_free:
+out_free:
                page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]);
                per_cpu(cpu_profile_hits, cpu)[1] = NULL;
                __free_page(page);
-               return NOTIFY_BAD;
+               return notifier_from_errno(-ENOMEM);
        case CPU_ONLINE:
-               cpu_set(cpu, prof_cpu_mask);
+       case CPU_ONLINE_FROZEN:
+               if (prof_cpu_mask != NULL)
+                       cpumask_set_cpu(cpu, prof_cpu_mask);
                break;
        case CPU_UP_CANCELED:
+       case CPU_UP_CANCELED_FROZEN:
        case CPU_DEAD:
-               cpu_clear(cpu, prof_cpu_mask);
+       case CPU_DEAD_FROZEN:
+               if (prof_cpu_mask != NULL)
+                       cpumask_clear_cpu(cpu, prof_cpu_mask);
                if (per_cpu(cpu_profile_hits, cpu)[0]) {
                        page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]);
                        per_cpu(cpu_profile_hits, cpu)[0] = NULL;
@@ -372,73 +410,85 @@ static int __devinit profile_cpu_callback(struct notifier_block *info,
        }
        return NOTIFY_OK;
 }
-#endif /* CONFIG_HOTPLUG_CPU */
 #else /* !CONFIG_SMP */
 #define profile_flip_buffers()         do { } while (0)
 #define profile_discard_flip_buffers() do { } while (0)
+#define profile_cpu_callback           NULL
 
-void profile_hits(int type, void *__pc, unsigned int nr_hits)
+static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
 {
        unsigned long pc;
-
-       if (prof_on != type || !prof_buffer)
-               return;
        pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift;
        atomic_add(nr_hits, &prof_buffer[min(pc, prof_len - 1)]);
 }
 #endif /* !CONFIG_SMP */
 
+void profile_hits(int type, void *__pc, unsigned int nr_hits)
+{
+       if (prof_on != type || !prof_buffer)
+               return;
+       do_profile_hits(type, __pc, nr_hits);
+}
+EXPORT_SYMBOL_GPL(profile_hits);
+
 void profile_tick(int type)
 {
        struct pt_regs *regs = get_irq_regs();
 
        if (type == CPU_PROFILING && timer_hook)
                timer_hook(regs);
-       if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask))
+       if (!user_mode(regs) && prof_cpu_mask != NULL &&
+           cpumask_test_cpu(smp_processor_id(), prof_cpu_mask))
                profile_hit(type, (void *)profile_pc(regs));
 }
 
 #ifdef CONFIG_PROC_FS
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <asm/uaccess.h>
-#include <asm/ptrace.h>
 
-static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
-                       int count, int *eof, void *data)
+static int prof_cpu_mask_proc_show(struct seq_file *m, void *v)
 {
-       int len = cpumask_scnprintf(page, count, *(cpumask_t *)data);
-       if (count - len < 2)
-               return -EINVAL;
-       len += sprintf(page + len, "\n");
-       return len;
+       seq_cpumask(m, prof_cpu_mask);
+       seq_putc(m, '\n');
+       return 0;
 }
 
-static int prof_cpu_mask_write_proc (struct file *file, const char __user *buffer,
-                                       unsigned long count, void *data)
+static int prof_cpu_mask_proc_open(struct inode *inode, struct file *file)
 {
-       cpumask_t *mask = (cpumask_t *)data;
-       unsigned long full_count = count, err;
-       cpumask_t new_value;
+       return single_open(file, prof_cpu_mask_proc_show, NULL);
+}
 
-       err = cpumask_parse_user(buffer, count, new_value);
-       if (err)
-               return err;
+static ssize_t prof_cpu_mask_proc_write(struct file *file,
+       const char __user *buffer, size_t count, loff_t *pos)
+{
+       cpumask_var_t new_value;
+       int err;
+
+       if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
+               return -ENOMEM;
 
-       *mask = new_value;
-       return full_count;
+       err = cpumask_parse_user(buffer, count, new_value);
+       if (!err) {
+               cpumask_copy(prof_cpu_mask, new_value);
+               err = count;
+       }
+       free_cpumask_var(new_value);
+       return err;
 }
 
+static const struct file_operations prof_cpu_mask_proc_fops = {
+       .open           = prof_cpu_mask_proc_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+       .write          = prof_cpu_mask_proc_write,
+};
+
 void create_prof_cpu_mask(struct proc_dir_entry *root_irq_dir)
 {
-       struct proc_dir_entry *entry;
-
        /* create /proc/irq/prof_cpu_mask */
-       if (!(entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir)))
-               return;
-       entry->nlink = 1;
-       entry->data = (void *)&prof_cpu_mask;
-       entry->read_proc = prof_cpu_mask_read_proc;
-       entry->write_proc = prof_cpu_mask_write_proc;
+       proc_create("prof_cpu_mask", 0600, root_irq_dir, &prof_cpu_mask_proc_fops);
 }
 
 /*
@@ -452,7 +502,7 @@ read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 {
        unsigned long p = *ppos;
        ssize_t read;
-       char * pnt;
+       char *pnt;
        unsigned int sample_step = 1 << prof_shift;
 
        profile_flip_buffers();
@@ -463,12 +513,12 @@ read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
        read = 0;
 
        while (p < sizeof(unsigned int) && count > 0) {
-               if (put_user(*((char *)(&sample_step)+p),buf))
+               if (put_user(*((char *)(&sample_step)+p), buf))
                        return -EFAULT;
                buf++; p++; count--; read++;
        }
        pnt = (char *)prof_buffer + p - sizeof(atomic_t);
-       if (copy_to_user(buf,(void *)pnt,count))
+       if (copy_to_user(buf, (void *)pnt, count))
                return -EFAULT;
        read += count;
        *ppos += read;
@@ -485,7 +535,7 @@ static ssize_t write_profile(struct file *file, const char __user *buf,
                             size_t count, loff_t *ppos)
 {
 #ifdef CONFIG_SMP
-       extern int setup_profiling_timer (unsigned int multiplier);
+       extern int setup_profiling_timer(unsigned int multiplier);
 
        if (count == sizeof(int)) {
                unsigned int multiplier;
@@ -502,32 +552,33 @@ static ssize_t write_profile(struct file *file, const char __user *buf,
        return count;
 }
 
-static struct file_operations proc_profile_operations = {
+static const struct file_operations proc_profile_operations = {
        .read           = read_profile,
        .write          = write_profile,
+       .llseek         = default_llseek,
 };
 
 #ifdef CONFIG_SMP
-static void __init profile_nop(void *unused)
+static void profile_nop(void *unused)
 {
 }
 
-static int __init create_hash_tables(void)
+static int create_hash_tables(void)
 {
        int cpu;
 
        for_each_online_cpu(cpu) {
-               int node = cpu_to_node(cpu);
+               int node = cpu_to_mem(cpu);
                struct page *page;
 
-               page = alloc_pages_node(node,
+               page = alloc_pages_exact_node(node,
                                GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
                                0);
                if (!page)
                        goto out_cleanup;
                per_cpu(cpu_profile_hits, cpu)[1]
                                = (struct profile_hit *)page_address(page);
-               page = alloc_pages_node(node,
+               page = alloc_pages_exact_node(node,
                                GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
                                0);
                if (!page)
@@ -539,7 +590,7 @@ static int __init create_hash_tables(void)
 out_cleanup:
        prof_on = 0;
        smp_mb();
-       on_each_cpu(profile_nop, NULL, 0, 1);
+       on_each_cpu(profile_nop, NULL, 1);
        for_each_online_cpu(cpu) {
                struct page *page;
 
@@ -560,17 +611,18 @@ out_cleanup:
 #define create_hash_tables()                   ({ 0; })
 #endif
 
-static int __init create_proc_profile(void)
+int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */
 {
        struct proc_dir_entry *entry;
 
        if (!prof_on)
                return 0;
        if (create_hash_tables())
-               return -1;
-       if (!(entry = create_proc_entry("profile", S_IWUSR | S_IRUGO, NULL)))
+               return -ENOMEM;
+       entry = proc_create("profile", S_IWUSR | S_IRUGO,
+                           NULL, &proc_profile_operations);
+       if (!entry)
                return 0;
-       entry->proc_fops = &proc_profile_operations;
        entry->size = (1+prof_len) * sizeof(atomic_t);
        hotcpu_notifier(profile_cpu_callback, 0);
        return 0;