[PATCH 1/1] drm/amdkfd: Fix unaligned doorbell absolute offset for gfx8
Felix Kuehling
felix.kuehling at amd.com
Wed Sep 27 17:27:01 UTC 2023
[+Mukul]
On 2023-09-27 12:16, Arvind Yadav wrote:
> This patch is to adjust the absolute doorbell offset
> against the doorbell id considering the doorbell
> size of 32/64 bit.
>
> Cc: Christian Koenig<christian.koenig at amd.com>
> Cc: Alex Deucher<alexander.deucher at amd.com>
> Signed-off-by: Shashank Sharma<shashank.sharma at amd.com>
> Signed-off-by: Arvind Yadav<Arvind.Yadav at amd.com>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index 0d3d538b64eb..c327f7f604d7 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -407,7 +407,16 @@ static int allocate_doorbell(struct qcm_process_device *qpd,
>
> q->properties.doorbell_off = amdgpu_doorbell_index_on_bar(dev->adev,
> qpd->proc_doorbells,
> - q->doorbell_id);
> + 0);
Looks like we're now always calling amdgpu_doorbell_index_on_bar with
the third parameter = 0. So we could remove that parameter. It doesn't
do us any good and only causes bugs if we use any non-0 value.
> +
> + /* Adjust the absolute doorbell offset against the doorbell id considering
> + * the doorbell size of 32/64 bit.
> + */
> + if (!KFD_IS_SOC15(dev))
> + q->properties.doorbell_off += q->doorbell_id;
> + else
> + q->properties.doorbell_off += q->doorbell_id * 2;
This could be simplified and generalized as
q->properties.doorbell_off += q->doorbell_id * dev->kfd->device_info.doorbell_size / 4;
Regards,
Felix
> +
> return 0;
> }
>
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