Re: [PATCH] drm/i915: make CSR firmware messages less verbose

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On 09/11/2015 01:29 AM, Chris Wilson wrote:
> On Thu, Sep 10, 2015 at 08:20:28AM -0700, Jesse Barnes wrote:
>> Use WARN_ONCE in a bunch of places and demote a message that would
>> continually spam us.
>>
>> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
>> ---
>>  drivers/gpu/drm/i915/intel_csr.c        | 12 +++++------
>>  drivers/gpu/drm/i915/intel_runtime_pm.c | 36 ++++++++++++++++-----------------
>>  2 files changed, 24 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_csr.c b/drivers/gpu/drm/i915/intel_csr.c
>> index ba1ae03..765dfcd 100644
>> --- a/drivers/gpu/drm/i915/intel_csr.c
>> +++ b/drivers/gpu/drm/i915/intel_csr.c
>> @@ -454,10 +454,10 @@ void intel_csr_ucode_fini(struct drm_device *dev)
>>  
>>  void assert_csr_loaded(struct drm_i915_private *dev_priv)
>>  {
>> -	WARN(intel_csr_load_status_get(dev_priv) != FW_LOADED,
>> -	     "CSR is not loaded.\n");
>> -	WARN(!I915_READ(CSR_PROGRAM_BASE),
>> -				"CSR program storage start is NULL\n");
>> -	WARN(!I915_READ(CSR_SSP_BASE), "CSR SSP Base Not fine\n");
>> -	WARN(!I915_READ(CSR_HTP_SKL), "CSR HTP Not fine\n");
>> +	WARN_ONCE(intel_csr_load_status_get(dev_priv) != FW_LOADED,
>> +		  "CSR is not loaded.\n");
>> +	WARN_ONCE(!I915_READ(CSR_PROGRAM_BASE),
>> +		  "CSR program storage start is NULL\n");
>> +	WARN_ONCE(!I915_READ(CSR_SSP_BASE), "CSR SSP Base Not fine\n");
>> +	WARN_ONCE(!I915_READ(CSR_HTP_SKL), "CSR HTP Not fine\n");
> 
> But why more than one warn in the function? If more than one fire,
> trying to get the information about what happened is a nightmare.
> 
> static int assert_once;
> if (assert_once)
>   return;
> 
> assert_once |= DRM_ERROR_ON(cond, "message");
> ...
> if (assert_once)
>     WARN("CSR not loaded");

I'm ok with getting fancier too, as long as the warnings only happen
one.  How about an ack or r-b on this one and/or a patch to make the
code more sensible?

Thanks,
Jesse

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