[PATCH 01/11] drm/amdgpu: add parameter to disable kernel queues

[Khatri, Sunil]

Reviewed-by: Sunil Khatri <sunil.khatri at amd.com>

On 3/6/2025 2:17 AM, Alex Deucher wrote:
> On chips that support user queues, setting this option
> will disable kernel queues to be used to validate
> user queues without kernel queues.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu.h     | 1 +
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 9 +++++++++
>   2 files changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 87062c1adcdf7..45437a8f29d3b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -270,6 +270,7 @@ extern int amdgpu_user_partt_mode;
>   extern int amdgpu_agp;
>   
>   extern int amdgpu_wbrf;
> +extern int amdgpu_disable_kq;
>   
>   #define AMDGPU_VM_MAX_NUM_CTX			4096
>   #define AMDGPU_SG_THRESHOLD			(256*1024*1024)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index b161daa900198..42a7619592ab9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -237,6 +237,7 @@ int amdgpu_agp = -1; /* auto */
>   int amdgpu_wbrf = -1;
>   int amdgpu_damage_clips = -1; /* auto */
>   int amdgpu_umsch_mm_fwlog;
> +int amdgpu_disable_kq = -1;
>   
>   DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
>   			"DRM_UT_CORE",
> @@ -1083,6 +1084,14 @@ MODULE_PARM_DESC(wbrf,
>   	"Enable Wifi RFI interference mitigation (0 = disabled, 1 = enabled, -1 = auto(default)");
>   module_param_named(wbrf, amdgpu_wbrf, int, 0444);
>   
> +/**
> + * DOC: disable_kq (int)
> + * Disable kernel queues on systems that support user queues.
> + * (0 = kernel queues enabled, 1 = kernel queues disabled, -1 = auto (default setting))
> + */
> +MODULE_PARM_DESC(disable_kq, "Disable kernel queues (-1 = auto (default), 0 = enable KQ, 1 = disable KQ)");
> +module_param_named(disable_kq, amdgpu_disable_kq, int, 0444);
> +
>   /* These devices are not supported by amdgpu.
>    * They are supported by the mach64, r128, radeon drivers
>    */