[PATCH 3/8] drm/radeon: Add PASID manager for KFD

[Alex Deucher]

On Tue, Sep 12, 2017 at 7:05 PM, Felix Kuehling <Felix.Kuehling at amd.com> wrote:
> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/radeon/radeon_kfd.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c b/drivers/gpu/drm/radeon/radeon_kfd.c
> index f6578c9..a2ac8ac 100644
> --- a/drivers/gpu/drm/radeon/radeon_kfd.c
> +++ b/drivers/gpu/drm/radeon/radeon_kfd.c
> @@ -58,6 +58,10 @@ static uint64_t get_vmem_size(struct kgd_dev *kgd);
>  static uint64_t get_gpu_clock_counter(struct kgd_dev *kgd);
>
>  static uint32_t get_max_engine_clock_in_mhz(struct kgd_dev *kgd);
> +
> +static int alloc_pasid(unsigned int bits);
> +static void free_pasid(unsigned int pasid);
> +
>  static uint16_t get_fw_version(struct kgd_dev *kgd, enum kgd_engine_type type);
>
>  /*
> @@ -112,6 +116,8 @@ static const struct kfd2kgd_calls kfd2kgd = {
>         .get_vmem_size = get_vmem_size,
>         .get_gpu_clock_counter = get_gpu_clock_counter,
>         .get_max_engine_clock_in_mhz = get_max_engine_clock_in_mhz,
> +       .alloc_pasid = alloc_pasid,
> +       .free_pasid = free_pasid,
>         .program_sh_mem_settings = kgd_program_sh_mem_settings,
>         .set_pasid_vmid_mapping = kgd_set_pasid_vmid_mapping,
>         .init_pipeline = kgd_init_pipeline,
> @@ -341,6 +347,31 @@ static uint32_t get_max_engine_clock_in_mhz(struct kgd_dev *kgd)
>         return rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac.sclk / 100;
>  }
>
> +/*
> + * PASID manager
> + */
> +static DEFINE_IDA(pasid_ida);
> +
> +int alloc_pasid(unsigned int bits)
> +{
> +       int pasid = -EINVAL;
> +
> +       for (bits = min(bits, 31U); bits > 0; bits--) {
> +               pasid = ida_simple_get(&pasid_ida,
> +                                      1U << (bits - 1), 1U << bits,
> +                                      GFP_KERNEL);
> +               if (pasid != -ENOSPC)
> +                       break;
> +       }
> +
> +       return pasid;
> +}
> +
> +void free_pasid(unsigned int pasid)
> +{
> +       ida_simple_remove(&pasid_ida, pasid);
> +}
> +
>  static inline struct radeon_device *get_radeon_device(struct kgd_dev *kgd)
>  {
>         return (struct radeon_device *)kgd;
> --
> 2.7.4
>
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