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Commit 52033cfb authored by Matan Barak's avatar Matan Barak Committed by Doug Ledford
Browse files

IB/mlx4: Add mmap call to map the hardware clock 



In order to read the HCA's cycle counter efficiently in
user space, we need to map the HCA's register.
This is done through mmap call.

Signed-off-by: default avatarMatan Barak <matanb@mellanox.com>
Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 2528e33e

drivers/infiniband/hw/mlx4/main.c

+17 −1
Original line number Diff line number Diff line
@@ -716,8 +716,24 @@ static int mlx4_ib_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) 
				       dev->dev->caps.num_uars,

				       PAGE_SIZE, vma->vm_page_prot))

			return -EAGAIN;

	} else

	} else if (vma->vm_pgoff == 3) {

		struct mlx4_clock_params params;

		int ret = mlx4_get_internal_clock_params(dev->dev, &params);



		if (ret)

			return ret;



		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

		if (io_remap_pfn_range(vma, vma->vm_start,

				       (pci_resource_start(dev->dev->persist->pdev,

							   params.bar) +

					params.offset)

				       >> PAGE_SHIFT,

				       PAGE_SIZE, vma->vm_page_prot))

			return -EAGAIN;

	} else {

		return -EINVAL;

	}



	return 0;

}

drivers/net/ethernet/mellanox/mlx4/main.c

+19 −0
Original line number Diff line number Diff line
@@ -1674,6 +1674,25 @@ static int map_internal_clock(struct mlx4_dev *dev) 
	return 0;

}



int mlx4_get_internal_clock_params(struct mlx4_dev *dev,

				   struct mlx4_clock_params *params)

{

	struct mlx4_priv *priv = mlx4_priv(dev);



	if (mlx4_is_slave(dev))

		return -ENOTSUPP;



	if (!params)

		return -EINVAL;



	params->bar = priv->fw.clock_bar;

	params->offset = priv->fw.clock_offset;

	params->size = MLX4_CLOCK_SIZE;



	return 0;

}

EXPORT_SYMBOL_GPL(mlx4_get_internal_clock_params);



static void unmap_internal_clock(struct mlx4_dev *dev)

{

	struct mlx4_priv *priv = mlx4_priv(dev);

include/linux/mlx4/device.h

+9 −0
Original line number Diff line number Diff line
@@ -829,6 +829,12 @@ struct mlx4_dev { 
	struct mlx4_vf_dev     *dev_vfs;

};



struct mlx4_clock_params {

	u64 offset;

	u8 bar;

	u8 size;

};



struct mlx4_eqe {

	u8			reserved1;

	u8			type;
@@ -1485,4 +1491,7 @@ int mlx4_ACCESS_PTYS_REG(struct mlx4_dev *dev, 
			 enum mlx4_access_reg_method method,

			 struct mlx4_ptys_reg *ptys_reg);



int mlx4_get_internal_clock_params(struct mlx4_dev *dev,

				   struct mlx4_clock_params *params);



#endif /* MLX4_DEVICE_H */