[PATCH] drm/amdkfd: increase max number of queues per process

[Alex Deucher]

On Mon, Mar 24, 2025 at 1:26 PM Eric Huang <jinhuieric.huang at amd.com> wrote:
>
> kfdtest KFDQMTest.OverSubscribeCpQueues with multiple
> gpu mode fails on gfx v9.4.3+NPS4+CPX which has 64 gpu
> nodes, the queues created are 65x64=4160, but the number
> 1024 0f KFD_MAX_NUM_OF_QUEUES_PER_PROCESS is not enough
> and test fails at function find_available_queue_slot().
> So increasing the nubmer will make the test passed.
>
> Signed-off-by: Eric Huang <jinhuieric.huang at amd.com>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> index f6aedf69c644..054a78207ffe 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
> @@ -94,7 +94,7 @@
>         ((typeof(ptr_to_struct)) kzalloc(sizeof(*ptr_to_struct), GFP_KERNEL))
>
>  #define KFD_MAX_NUM_OF_PROCESSES 512
> -#define KFD_MAX_NUM_OF_QUEUES_PER_PROCESS 1024
> +#define KFD_MAX_NUM_OF_QUEUES_PER_PROCESS 4160

Doesn't this limit have more to do with the number of doorbells you
can fit into a 4K page?  If you only allocate 4K for doorbells how can
you increase this?

Alex

>
>  /*
>   * Size of the per-process TBA+TMA buffer: 2 pages
> --
> 2.34.1
>