[PATCH] drm/amd/pm: Add warning for unexpected PG requests

[Lazar, Lijo]

On 11/25/2021 6:52 PM, Chen, Guchun wrote:
> [Public]
> 
> Use dev_warn to be mGPU friendly?

The intention is to get a trace as well along with that. There are 
multiple paths to this function.

Thanks,
Lijo

> 
> Regards,
> Guchun
> 
> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Lijo Lazar
> Sent: Thursday, November 25, 2021 7:51 PM
> To: amd-gfx at lists.freedesktop.org
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Limonciello, Mario <Mario.Limonciello at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>
> Subject: [PATCH] drm/amd/pm: Add warning for unexpected PG requests
> 
> Ideally power gate/ungate requests shouldn't come when smu block is uninitialized. Add a WARN message to check the origins if such a thing ever happens.
> 
> Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
> ---
>   drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> index e156add7b560..e0f8ab8be975 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> @@ -277,8 +277,11 @@ static int smu_dpm_set_power_gate(void *handle,
>   	struct smu_context *smu = handle;
>   	int ret = 0;
>   
> -	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled)
> +	if (!smu->pm_enabled || !smu->adev->pm.dpm_enabled) {
> +		WARN(true, "SMU uninitialized but power %s requested for %u!\n",
> +		     gate ? "gate" : "ungate", block_type);
>   		return -EOPNOTSUPP;
> +	}
>   
>   	switch (block_type) {
>   	/*
> --
> 2.25.1
>