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IB/mlx5: Mmap the HCA's core clock register to user-space

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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>
This commit is contained in:
Matan Barak 2015-12-15 20:30:13 +02:00 committed by Doug Ledford
parent b368d7cb8c
commit d69e3bcf79
2 changed files with 31 additions and 1 deletions
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28
drivers/infiniband/hw/mlx5/main.c
View File

@ -1023,6 +1023,34 @@ static int mlx5_ib_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vm
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;
}

4
drivers/infiniband/hw/mlx5/mlx5_ib.h
View File

@ -65,7 +65,9 @@ enum {
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 {