Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...

[linux-drm-fsl-dcu.git] / lib / percpu_ida.c

diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c
index e315903ec63a80fd95581806a1ee01c2c331d58e..9d054bf91d0f3cd278494dedd3114dfd3b292bcb 100644 (file)
--- a/lib/percpu_ida.c
+++ b/lib/percpu_ida.c
@@ -30,15 +30,6 @@
 #include <linux/spinlock.h>
 #include <linux/percpu_ida.h>
 
-/*
- * Number of tags we move between the percpu freelist and the global freelist at
- * a time
- */
-#define IDA_PCPU_BATCH_MOVE    32U
-
-/* Max size of percpu freelist, */
-#define IDA_PCPU_SIZE          ((IDA_PCPU_BATCH_MOVE * 3) / 2)
-
 struct percpu_ida_cpu {
        /*
         * Even though this is percpu, we need a lock for tag stealing by remote
@@ -78,7 +69,7 @@ static inline void steal_tags(struct percpu_ida *pool,
        struct percpu_ida_cpu *remote;
 
        for (cpus_have_tags = cpumask_weight(&pool->cpus_have_tags);
-            cpus_have_tags * IDA_PCPU_SIZE > pool->nr_tags / 2;
+            cpus_have_tags * pool->percpu_max_size > pool->nr_tags / 2;
             cpus_have_tags--) {
                cpu = cpumask_next(cpu, &pool->cpus_have_tags);
 
@@ -123,7 +114,7 @@ static inline void alloc_global_tags(struct percpu_ida *pool,
 {
        move_tags(tags->freelist, &tags->nr_free,
                  pool->freelist, &pool->nr_free,
-                 min(pool->nr_free, IDA_PCPU_BATCH_MOVE));
+                 min(pool->nr_free, pool->percpu_batch_size));
 }
 
 static inline unsigned alloc_local_tag(struct percpu_ida_cpu *tags)
@@ -244,17 +235,17 @@ void percpu_ida_free(struct percpu_ida *pool, unsigned tag)
                wake_up(&pool->wait);
        }
 
-       if (nr_free == IDA_PCPU_SIZE) {
+       if (nr_free == pool->percpu_max_size) {
                spin_lock(&pool->lock);
 
                /*
                 * Global lock held and irqs disabled, don't need percpu
                 * lock
                 */
-               if (tags->nr_free == IDA_PCPU_SIZE) {
+               if (tags->nr_free == pool->percpu_max_size) {
                        move_tags(pool->freelist, &pool->nr_free,
                                  tags->freelist, &tags->nr_free,
-                                 IDA_PCPU_BATCH_MOVE);
+                                 pool->percpu_batch_size);
 
                        wake_up(&pool->wait);
                }
@@ -291,7 +282,8 @@ EXPORT_SYMBOL_GPL(percpu_ida_destroy);
  * Allocation is percpu, but sharding is limited by nr_tags - for best
  * performance, the workload should not span more cpus than nr_tags / 128.
  */
-int percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags)
+int __percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags,
+       unsigned long max_size, unsigned long batch_size)
 {
        unsigned i, cpu, order;
 
@@ -300,6 +292,8 @@ int percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags)
        init_waitqueue_head(&pool->wait);
        spin_lock_init(&pool->lock);
        pool->nr_tags = nr_tags;
+       pool->percpu_max_size = max_size;
+       pool->percpu_batch_size = batch_size;
 
        /* Guard against overflow */
        if (nr_tags > (unsigned) INT_MAX + 1) {
@@ -318,7 +312,7 @@ int percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags)
        pool->nr_free = nr_tags;
 
        pool->tag_cpu = __alloc_percpu(sizeof(struct percpu_ida_cpu) +
-                                      IDA_PCPU_SIZE * sizeof(unsigned),
+                                      pool->percpu_max_size * sizeof(unsigned),
                                       sizeof(unsigned));
        if (!pool->tag_cpu)
                goto err;
@@ -331,4 +325,65 @@ err:
        percpu_ida_destroy(pool);
        return -ENOMEM;
 }
-EXPORT_SYMBOL_GPL(percpu_ida_init);
+EXPORT_SYMBOL_GPL(__percpu_ida_init);
+
+/**
+ * percpu_ida_for_each_free - iterate free ids of a pool
+ * @pool: pool to iterate
+ * @fn: interate callback function
+ * @data: parameter for @fn
+ *
+ * Note, this doesn't guarantee to iterate all free ids restrictly. Some free
+ * ids might be missed, some might be iterated duplicated, and some might
+ * be iterated and not free soon.
+ */
+int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn,
+       void *data)
+{
+       unsigned long flags;
+       struct percpu_ida_cpu *remote;
+       unsigned cpu, i, err = 0;
+
+       local_irq_save(flags);
+       for_each_possible_cpu(cpu) {
+               remote = per_cpu_ptr(pool->tag_cpu, cpu);
+               spin_lock(&remote->lock);
+               for (i = 0; i < remote->nr_free; i++) {
+                       err = fn(remote->freelist[i], data);
+                       if (err)
+                               break;
+               }
+               spin_unlock(&remote->lock);
+               if (err)
+                       goto out;
+       }
+
+       spin_lock(&pool->lock);
+       for (i = 0; i < pool->nr_free; i++) {
+               err = fn(pool->freelist[i], data);
+               if (err)
+                       break;
+       }
+       spin_unlock(&pool->lock);
+out:
+       local_irq_restore(flags);
+       return err;
+}
+EXPORT_SYMBOL_GPL(percpu_ida_for_each_free);
+
+/**
+ * percpu_ida_free_tags - return free tags number of a specific cpu or global pool
+ * @pool: pool related
+ * @cpu: specific cpu or global pool if @cpu == nr_cpu_ids
+ *
+ * Note: this just returns a snapshot of free tags number.
+ */
+unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu)
+{
+       struct percpu_ida_cpu *remote;
+       if (cpu == nr_cpu_ids)
+               return pool->nr_free;
+       remote = per_cpu_ptr(pool->tag_cpu, cpu);
+       return remote->nr_free;
+}
+EXPORT_SYMBOL_GPL(percpu_ida_free_tags);