[PATCH for-next V3 7/8] IB/mlx4: Add mmap call to map the hardware clock

[Or Gerlitz]

From: Matan Barak <mat...@mellanox.com>

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: Matan Barak <mat...@mellanox.com>
Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
---
 drivers/infiniband/hw/mlx4/main.c         |   18 +++++++++++++++++-
 drivers/net/ethernet/mellanox/mlx4/main.c |   19 +++++++++++++++++++
 include/linux/mlx4/device.h               |    9 +++++++++
 3 files changed, 45 insertions(+), 1 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/main.c 
b/drivers/infiniband/hw/mlx4/main.c
index 61febb8..a4abebf 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -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;
 }
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c 
b/drivers/net/ethernet/mellanox/mlx4/main.c
index ced5eca..70de39c 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -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);
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 83e80ab..f94984f 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -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 */
-- 
1.7.1

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