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mlx4_core: maintain available field in bitmap allocator

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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>
This commit is contained in:
Eli Cohen 2011-03-22 22:38:45 +00:00 committed by David S. Miller
parent c1b43dca13
commit 42d1e017e2
2 changed files with 15 additions and 0 deletions
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13
drivers/net/mlx4/alloc.c
View file

@ -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);

2
drivers/net/mlx4/mlx4.h
View file

@ -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);