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| author | Matan Barak <matanb@mellanox.com> | 2015-12-15 20:30:13 +0200 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2015-12-23 23:25:59 -0500 |
| commit | d69e3bcf79764ed833e0cc6e0645dc87589cec22 (patch) | |
| tree | 5f443d6aafe32729363f65f2035bea6d892b0763 /drivers/infiniband/hw/mlx5/main.c | |
| parent | b368d7cb8ceb77f481b066bd8be5fada82da7301 (diff) | |
| download | lwn-d69e3bcf79764ed833e0cc6e0645dc87589cec22.tar.gz lwn-d69e3bcf79764ed833e0cc6e0645dc87589cec22.zip | |
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>
Diffstat (limited to 'drivers/infiniband/hw/mlx5/main.c')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/main.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index a3ae9ccde460..602f067c14cc 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -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; } |