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authorEli Cohen <eli@mellanox.co.il>2011-03-23 01:38:45 +0300
committerDavid S. Miller <davem@davemloft.net>2011-03-23 22:24:24 +0300
commit42d1e017e2f040c3e3d62b6cfa3a26351a865d04 (patch)
tree67adabb8516a4a027377039fdb7ea49b4215a8b3
parentc1b43dca137f2154845122417fba86d4bae67182 (diff)
downloadlinux-42d1e017e2f040c3e3d62b6cfa3a26351a865d04.tar.xz
mlx4_core: maintain available field in bitmap allocator
Add mlx4_bitmap_avail() to give the number of available resources. We want to use this as a hint to whether to allocate a resources or not. This patch is introduced to be used with allocation blue flame registers. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/mlx4/alloc.c13
-rw-r--r--drivers/net/mlx4/mlx4.h2
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/mlx4/alloc.c b/drivers/net/mlx4/alloc.c
index 3a4277f6fac4..116cae334dad 100644
--- a/drivers/net/mlx4/alloc.c
+++ b/drivers/net/mlx4/alloc.c
@@ -62,6 +62,9 @@ u32 mlx4_bitmap_alloc(struct mlx4_bitmap *bitmap)
} else
obj = -1;
+ if (obj != -1)
+ --bitmap->avail;
+
spin_unlock(&bitmap->lock);
return obj;
@@ -101,11 +104,19 @@ u32 mlx4_bitmap_alloc_range(struct mlx4_bitmap *bitmap, int cnt, int align)
} else
obj = -1;
+ if (obj != -1)
+ bitmap->avail -= cnt;
+
spin_unlock(&bitmap->lock);
return obj;
}
+u32 mlx4_bitmap_avail(struct mlx4_bitmap *bitmap)
+{
+ return bitmap->avail;
+}
+
void mlx4_bitmap_free_range(struct mlx4_bitmap *bitmap, u32 obj, int cnt)
{
obj &= bitmap->max + bitmap->reserved_top - 1;
@@ -115,6 +126,7 @@ void mlx4_bitmap_free_range(struct mlx4_bitmap *bitmap, u32 obj, int cnt)
bitmap->last = min(bitmap->last, obj);
bitmap->top = (bitmap->top + bitmap->max + bitmap->reserved_top)
& bitmap->mask;
+ bitmap->avail += cnt;
spin_unlock(&bitmap->lock);
}
@@ -130,6 +142,7 @@ int mlx4_bitmap_init(struct mlx4_bitmap *bitmap, u32 num, u32 mask,
bitmap->max = num - reserved_top;
bitmap->mask = mask;
bitmap->reserved_top = reserved_top;
+ bitmap->avail = num - reserved_top - reserved_bot;
spin_lock_init(&bitmap->lock);
bitmap->table = kzalloc(BITS_TO_LONGS(bitmap->max) *
sizeof (long), GFP_KERNEL);
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index bc9a21657a4f..c1e0e5f1bcdb 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -105,6 +105,7 @@ struct mlx4_bitmap {
u32 max;
u32 reserved_top;
u32 mask;
+ u32 avail;
spinlock_t lock;
unsigned long *table;
};
@@ -371,6 +372,7 @@ u32 mlx4_bitmap_alloc(struct mlx4_bitmap *bitmap);
void mlx4_bitmap_free(struct mlx4_bitmap *bitmap, u32 obj);
u32 mlx4_bitmap_alloc_range(struct mlx4_bitmap *bitmap, int cnt, int align);
void mlx4_bitmap_free_range(struct mlx4_bitmap *bitmap, u32 obj, int cnt);
+u32 mlx4_bitmap_avail(struct mlx4_bitmap *bitmap);
int mlx4_bitmap_init(struct mlx4_bitmap *bitmap, u32 num, u32 mask,
u32 reserved_bot, u32 resetrved_top);
void mlx4_bitmap_cleanup(struct mlx4_bitmap *bitmap);