IB/mlx5: Mmap the HCA's core clock register to user-space
In order to read the HCA's current cycles register, we need
to map it to user-space. Add support to map this register
via mmap command.
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Moshe Lazer <moshel@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index a3ae9cc..602f067 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1023,6 +1023,34 @@
case MLX5_IB_MMAP_GET_CONTIGUOUS_PAGES:
return -ENOSYS;
+ case MLX5_IB_MMAP_CORE_CLOCK:
+ {
+ phys_addr_t pfn;
+
+ if (vma->vm_end - vma->vm_start != PAGE_SIZE)
+ return -EINVAL;
+
+ if (vma->vm_flags & (VM_WRITE | VM_EXEC))
+ return -EPERM;
+
+ /* Don't expose to user-space information it shouldn't have */
+ if (PAGE_SIZE > 4096)
+ return -EOPNOTSUPP;
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ pfn = (dev->mdev->iseg_base +
+ offsetof(struct mlx5_init_seg, internal_timer_h)) >>
+ PAGE_SHIFT;
+ if (io_remap_pfn_range(vma, vma->vm_start, pfn,
+ PAGE_SIZE, vma->vm_page_prot))
+ return -EAGAIN;
+
+ mlx5_ib_dbg(dev, "mapped internal timer at 0x%lx, PA 0x%llx\n",
+ vma->vm_start,
+ (unsigned long long)pfn << PAGE_SHIFT);
+ break;
+ }
+
default:
return -EINVAL;
}
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index b2a6643..1303487 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -65,7 +65,9 @@
enum mlx5_ib_mmap_cmd {
MLX5_IB_MMAP_REGULAR_PAGE = 0,
- MLX5_IB_MMAP_GET_CONTIGUOUS_PAGES = 1, /* always last */
+ MLX5_IB_MMAP_GET_CONTIGUOUS_PAGES = 1,
+ /* 5 is chosen in order to be compatible with old versions of libmlx5 */
+ MLX5_IB_MMAP_CORE_CLOCK = 5,
};
enum {