Re: [PATCH 4/4] drm/amdgpu: add module parameter choose reset mode

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

> I use "else if" because I don't want to break the reset_method checking context, it will be much easier for code reviewing later I think.

What do you mean with that? To just keep the two "if" more closely together?

See we usually avoid extra "else" when there is a return in the if to 
make sure not to confuse the reader.

E.g. and "else" usually implies that both branches converge again after 
the if and that's not the case if you have a return or goto.

Regards,
Christian.

Am 14.07.20 um 11:58 schrieb Sheng, Wenhui:
> [AMD Official Use Only - Internal Distribution Only]
>
> Well,  drop else will make code much more clean.
> I use "else if" because I don't want to break the reset_method checking context, it will be much easier for code reviewing later I think.
>
> Will refine it anyway:)
>
> Thanks
> Wenhui
> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken@gmail.com>
> Sent: Tuesday, July 14, 2020 4:36 PM
> To: Sheng, Wenhui <Wenhui.Sheng@amd.com>; amd-gfx@lists.freedesktop.org
> Cc: Gao, Likun <Likun.Gao@amd.com>; Zhang, Hawking <Hawking.Zhang@amd.com>
> Subject: Re: [PATCH 4/4] drm/amdgpu: add module parameter choose reset mode
>
> Am 14.07.20 um 04:29 schrieb Wenhui Sheng:
>> Default value is auto, doesn't change
>> original reset method logic.
>>
>> v2: change to use parameter reset_method
>> v3: add warn msg if specified mode isn't supported
>>
>> Signed-off-by: Likun Gao <Likun.Gao@amd.com>
>> Signed-off-by: Wenhui Sheng <Wenhui.Sheng@amd.com>
>> ---
>>    drivers/gpu/drm/amd/amdgpu/amdgpu.h     | 1 +
>>    drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 8 ++++++++
>>    drivers/gpu/drm/amd/amdgpu/cik.c        | 7 +++++++
>>    drivers/gpu/drm/amd/amdgpu/nv.c         | 7 +++++++
>>    drivers/gpu/drm/amd/amdgpu/si.c         | 5 +++++
>>    drivers/gpu/drm/amd/amdgpu/soc15.c      | 8 ++++++++
>>    drivers/gpu/drm/amd/amdgpu/vi.c         | 7 +++++++
>>    7 files changed, 43 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> index 4de93cef79b9..06bfb8658dec 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>> @@ -196,6 +196,7 @@ static const bool debug_evictions; /* = false */
>>    #endif
>>    
>>    extern int amdgpu_tmz;
>> +extern int amdgpu_reset_method;
>>    
>>    #ifdef CONFIG_DRM_AMDGPU_SI
>>    extern int amdgpu_si_support;
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> index 94c83a9d4987..581d5fcac361 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> @@ -154,6 +154,7 @@ int amdgpu_mes = 0;
>>    int amdgpu_noretry = 1;
>>    int amdgpu_force_asic_type = -1;
>>    int amdgpu_tmz = 0;
>> +int amdgpu_reset_method = -1; /* auto */
>>    
>>    struct amdgpu_mgpu_info mgpu_info = {
>>    	.mutex = __MUTEX_INITIALIZER(mgpu_info.mutex),
>> @@ -793,6 +794,13 @@ module_param_named(abmlevel, amdgpu_dm_abm_level, uint, 0444);
>>    MODULE_PARM_DESC(tmz, "Enable TMZ feature (-1 = auto, 0 = off (default), 1 = on)");
>>    module_param_named(tmz, amdgpu_tmz, int, 0444);
>>    
>> +/**
>> + * DOC: reset_method (int)
>> + * GPU reset method (-1 = auto (default), 0 = legacy, 1 = mode0, 2 =
>> +mode1, 3 = mode2, 4 = baco)  */ MODULE_PARM_DESC(reset_method, "GPU
>> +reset method (-1 = auto (default), 0 = legacy, 1 = mode0, 2 = mode1,
>> +3 = mode2, 4 = baco)"); module_param_named(reset_method,
>> +amdgpu_reset_method, int, 0444);
>> +
>>    static const struct pci_device_id pciidlist[] = {
>>    #ifdef  CONFIG_DRM_AMDGPU_SI
>>    	{0x1002, 0x6780, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TAHITI}, diff
>> --git a/drivers/gpu/drm/amd/amdgpu/cik.c
>> b/drivers/gpu/drm/amd/amdgpu/cik.c
>> index fe306d0f73f7..310bcf81256f 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/cik.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/cik.c
>> @@ -1326,6 +1326,13 @@ cik_asic_reset_method(struct amdgpu_device *adev)
>>    {
>>    	bool baco_reset;
>>    
>> +	if (amdgpu_reset_method == AMD_RESET_METHOD_LEGACY ||
>> +	    amdgpu_reset_method == AMD_RESET_METHOD_BACO)
>> +		return amdgpu_reset_method;
>> +	else if (amdgpu_reset_method != -1)
> When you return anyway you can also drop the else here and on other occasions as well.
>
> Apart from that the patch looks good to me.
>
> We usually try to avoid adding more module parameters, but I think this one is really justified.
>
> Thanks,
> Christian.
>
>> +		dev_warn(adev->dev, "Specified reset:%d isn't supported, using AUTO instead.\n",
>> +				  amdgpu_reset_method);
>> +
>>    	switch (adev->asic_type) {
>>    	case CHIP_BONAIRE:
>>    	case CHIP_HAWAII:
>> diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c
>> b/drivers/gpu/drm/amd/amdgpu/nv.c index 9f1240bd0310..486321bcab8f
>> 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/nv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/nv.c
>> @@ -311,6 +311,13 @@ nv_asic_reset_method(struct amdgpu_device *adev)
>>    {
>>    	struct smu_context *smu = &adev->smu;
>>    
>> +	if (amdgpu_reset_method == AMD_RESET_METHOD_MODE1 ||
>> +	    amdgpu_reset_method == AMD_RESET_METHOD_BACO)
>> +		return amdgpu_reset_method;
>> +	else if (amdgpu_reset_method != -1)
>> +		dev_warn(adev->dev, "Specified reset method:%d isn't supported, using AUTO instead.\n",
>> +				  amdgpu_reset_method);
>> +
>>    	if (smu_baco_is_support(smu))
>>    		return AMD_RESET_METHOD_BACO;
>>    	else
>> diff --git a/drivers/gpu/drm/amd/amdgpu/si.c
>> b/drivers/gpu/drm/amd/amdgpu/si.c index 9d7b4ccd17b8..1b449291f068
>> 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/si.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/si.c
>> @@ -1229,6 +1229,11 @@ static bool si_asic_supports_baco(struct amdgpu_device *adev)
>>    static enum amd_reset_method
>>    si_asic_reset_method(struct amdgpu_device *adev)
>>    {
>> +	if (amdgpu_reset_method != AMD_RESET_METHOD_LEGACY &&
>> +	    amdgpu_reset_method != -1)
>> +		dev_warn(adev->dev, "Specified reset method:%d isn't supported, using AUTO instead.\n",
>> +				  amdgpu_reset_method);
>> +
>>    	return AMD_RESET_METHOD_LEGACY;
>>    }
>>    
>> diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c
>> b/drivers/gpu/drm/amd/amdgpu/soc15.c
>> index 8c739b285915..40b343b25588 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/soc15.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
>> @@ -532,6 +532,14 @@ soc15_asic_reset_method(struct amdgpu_device *adev)
>>    	bool baco_reset = false;
>>    	struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
>>    
>> +	if (amdgpu_reset_method == AMD_RESET_METHOD_MODE1 ||
>> +	    amdgpu_reset_method == AMD_RESET_METHOD_MODE2 ||
>> +		amdgpu_reset_method == AMD_RESET_METHOD_BACO)
>> +		return amdgpu_reset_method;
>> +	else if (amdgpu_reset_method != -1)
>> +		dev_warn(adev->dev, "Specified reset method:%d isn't supported, using AUTO instead.\n",
>> +				  amdgpu_reset_method);
>> +
>>    	switch (adev->asic_type) {
>>    	case CHIP_RAVEN:
>>    	case CHIP_RENOIR:
>> diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c
>> b/drivers/gpu/drm/amd/amdgpu/vi.c index 4e5e91888d87..e4628c17802f
>> 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/vi.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/vi.c
>> @@ -710,6 +710,13 @@ vi_asic_reset_method(struct amdgpu_device *adev)
>>    {
>>    	bool baco_reset;
>>    
>> +	if (amdgpu_reset_method == AMD_RESET_METHOD_LEGACY ||
>> +	    amdgpu_reset_method == AMD_RESET_METHOD_BACO)
>> +		return amdgpu_reset_method;
>> +	else if (amdgpu_reset_method != -1)
>> +		dev_warn(adev->dev, "Specified reset method:%d isn't supported, using AUTO instead.\n",
>> +				  amdgpu_reset_method);
>> +
>>    	switch (adev->asic_type) {
>>    	case CHIP_FIJI:
>>    	case CHIP_TONGA:
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx