[PATCH 2/3] drm/amdgpu: add psp ecc support

[Zhang, Jerry (Junwei)]

On 07/31/2017 04:41 PM, Huang Rui wrote:
> On Mon, Jul 31, 2017 at 04:10:10PM +0800, Zhang, Jerry wrote:
>> On 07/31/2017 01:57 PM, Huang Rui wrote:
>>> On Fri, Jul 28, 2017 at 05:11:18PM +0800, Junwei Zhang wrote:
>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang at amd.com>
>>>> ---
>>>>    drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 17 ++++++++++++++---
>>>>    drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h | 22 ++++++++++++++++++++++
>>>>    2 files changed, 36 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
>>>> index 1aa41af..b04cc80 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
>>>> @@ -256,6 +256,10 @@ static int psp_hw_start(struct psp_context *psp)
>>>>    {
>>>>    	int ret;
>>>>
>>>> +	ret = psp_bootloader_set_ecc_mode(psp);
>>>> +	if (ret)
>>>> +		return ret;
>>>> +
>>>>    	ret = psp_bootloader_load_sysdrv(psp);
>>>>    	if (ret)
>>>>    		return ret;
>>>> @@ -365,9 +369,16 @@ static int psp_load_fw(struct amdgpu_device *adev)
>>>>    	if (ret)
>>>>    		goto failed_mem;
>>>>
>>>> -	ret = psp_hw_start(psp);
>>>> -	if (ret)
>>>> -		goto failed_mem;
>>>> +	if (psp_bootloader_is_sos_running(psp) &&
>>>> +			psp->config.ecc_mode != PSP_ECC_MODE__NONE) {
>>>
>>> It need set a default value to config psp->ecc_mode, otherwise, it is
>>> always "0" in this implementation.
>>
>> For ASIC support ECC, it's set in psp_sw_init(), like vega10 case.
>
> Not only asic support, but also VBIOS enablement. Yes, we would better
> initialize it in sw init and use a boot param to configure it at least
> until we confirmed the method to get ecc_mode from VBIOS. At same time, it
> should add a comment to like below in sw_init:
>
> /* FIXME: will find a way to get ecc mode via VBIOS */

Thanks for your advice.
I could add a comment for that.

Actually there is a patch 3 you may miss in mailbox, where already initialize 
the ecc mode for vega10.
   * [PATCH 3/3] drm/amdgpu: add psp ecc support for vega10

Currently I'm not sure the requirements for ECC support, especially ECC mode 
initialization. So just hard code ECC mode for a specific ASIC(Vega10 for now).

>
>> For ASIC not support ECC yet, it always "0", indicating PSP_ECC_MODE__NONE,
>> aka not enabled by default.
>>
>> It's expected result, I think.
>>
>>>
>>>> +		if (psp_ring_create(psp, PSP_RING_TYPE__KM))
>>>> +			goto failed_mem;
>>>> +		if (psp_tmr_load(psp))
>>>> +			goto failed_mem;
>>>> +	} else {
>>>> +		if (psp_hw_start(psp))
>>>> +			goto failed_mem;
>>>> +	}
>>>>
>>>>    	ret = psp_np_fw_load(psp);
>>>>    	if (ret)
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h
>>>> index 3776186..8ec9194 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.h
>>>> @@ -63,6 +63,19 @@ enum psp_bootloader_command_list
>>>>    	PSP_BL__DEFAULT_ECC = 0x30003,
>>>>    };
>>>>
>>>> +enum psp_ecc_mode
>>>> +{
>>>> +	PSP_ECC_MODE__NONE = 0,
>>>> +	PSP_ECC_MODE__OFF = 1,
>>>> +	PSP_ECC_MODE__ON = 2,
>>>> +	PSP_ECC_MODE__PARTIALON = 3,
>>>> +};
>>>> +
>>>> +struct psp_config
>>>> +{
>>>> +	enum psp_ecc_mode		ecc_mode;
>>>> +};
>>>> +
>>>>    struct psp_context
>>>>    {
>>>>    	struct amdgpu_device            *adev;
>>>> @@ -70,6 +83,8 @@ struct psp_context
>>>>    	struct psp_gfx_cmd_resp		*cmd;
>>>>
>>>>    	int (*init_microcode)(struct psp_context *psp);
>>>> +	int (*bootloader_set_ecc_mode)(struct psp_context *psp);
>>>> +	bool (*bootloader_is_sos_running)(struct psp_context *psp);
>>>>    	int (*bootloader_load_sysdrv)(struct psp_context *psp);
>>>>    	int (*bootloader_load_sos)(struct psp_context *psp);
>>>>    	int (*prep_cmd_buf)(struct amdgpu_firmware_info *ucode,
>>>> @@ -123,6 +138,9 @@ struct psp_context
>>>>    	struct amdgpu_bo		*cmd_buf_bo;
>>>>    	uint64_t			cmd_buf_mc_addr;
>>>>    	struct psp_gfx_cmd_resp		*cmd_buf_mem;
>>>> +
>>>> +	/* psp config */
>>>> +	struct psp_config		config;
>>>
>>> At current, we don't need a psp_config wrapper here. Use "enum ecc_mode"
>>> directly to make code more simple.
>>
>> I considered it twice when implemented the code.
>> IMO, it's good way to collect all config info in a structure like gfx config.
>> It's not only used for ECC, but an initial step for psp_config.
>>
>> How do you think about it?
>>
>
> Yes, make sense. But we could introduce the config wrapper when we need add
> new configration in future. Currently, it looks a little superfluous.
> Anyway, I am also fine if you want to introduce it now, no matter.

Got your concern.

Cause actually we always forget to add config structure until some day when 
somebody gets time to have a code clean-up.

Jerry

>
> Thanks,
> Rui
>