[PATCH 1/3] drm/amdgpu: always consider virualised device for checking post

[Ding, Pixel]

you can see the difference of function amdgpu_need_post. Generally speaking, there were 2 functions to check VBIOS posting, one considers VF and passthru while the other doesn’t. In fact we should always consider VF and PT for checking, right? For example, this checking here believe VF needs a posting because SCRATCH registers are not the expected value. Is it clear?
— 
Sincerely Yours,
Pixel








On 17/10/2017, 5:00 PM, "Liu, Monk" <Monk.Liu at amd.com> wrote:

>From the patch itself I still couldn't tell the difference 
>
>-----Original Message-----
>From: Ding, Pixel 
>Sent: 2017年10月17日 15:54
>To: Liu, Monk <Monk.Liu at amd.com>; amd-gfx at lists.freedesktop.org; Koenig, Christian <Christian.Koenig at amd.com>
>Cc: Li, Bingley <Bingley.Li at amd.com>; Sun, Gary <Gary.Sun at amd.com>
>Subject: Re: [PATCH 1/3] drm/amdgpu: always consider virualised device for checking post
>
>It fixes a issue hidden in:
>
>95 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
> 96 {
> 97	uint8_t __iomem *bios;
> 98	resource_size_t vram_base;
> 99	resource_size_t size = 256 * 1024; /* ??? */
>100
>101	if (!(adev->flags & AMD_IS_APU))
>102		if (amdgpu_need_post(adev))
>103		return false;
>
>
>This makes bios reading fallback to SMC INDEX/DATA register case.
>
>— 
>Sincerely Yours,
>Pixel
>
>
>
>
>
>
>
>
>On 17/10/2017, 3:48 PM, "Liu, Monk" <Monk.Liu at amd.com> wrote:
>
>>I don't understand how this patch works??? Looks like just rename vpost_needed to check_post
>>
>>-----Original Message-----
>>From: Pixel Ding [mailto:Pixel.Ding at amd.com] 
>>Sent: 2017年10月17日 14:38
>>To: amd-gfx at lists.freedesktop.org; Liu, Monk <Monk.Liu at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>
>>Cc: Li, Bingley <Bingley.Li at amd.com>; Sun, Gary <Gary.Sun at amd.com>; Ding, Pixel <Pixel.Ding at amd.com>
>>Subject: [PATCH 1/3] drm/amdgpu: always consider virualised device for checking post
>>
>>From: pding <Pixel.Ding at amd.com>
>>
>>The post checking on scratch registers isn't reliable for virtual function.
>>
>>Signed-off-by: pding <Pixel.Ding at amd.com>
>>---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++----
>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>
>>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>index 683965b..ab8f0d6 100644
>>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>@@ -669,7 +669,7 @@ void amdgpu_gart_location(struct amdgpu_device *adev, struct amdgpu_mc *mc)
>>  * or post is needed if  hw reset is performed.
>>  * Returns true if need or false if not.
>>  */
>>-bool amdgpu_need_post(struct amdgpu_device *adev)
>>+static bool amdgpu_check_post(struct amdgpu_device *adev)
>> {
>> 	uint32_t reg;
>> 
>>@@ -692,7 +692,7 @@ bool amdgpu_need_post(struct amdgpu_device *adev)
>> 
>> }
>> 
>>-static bool amdgpu_vpost_needed(struct amdgpu_device *adev)
>>+bool amdgpu_need_post(struct amdgpu_device *adev)
>> {
>> 	if (amdgpu_sriov_vf(adev))
>> 		return false;
>>@@ -716,7 +716,7 @@ static bool amdgpu_vpost_needed(struct amdgpu_device *adev)
>> 				return true;
>> 		}
>> 	}
>>-	return amdgpu_need_post(adev);
>>+	return amdgpu_check_post(adev);
>> }
>> 
>> /**
>>@@ -2208,7 +2208,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>> 	amdgpu_device_detect_sriov_bios(adev);
>> 
>> 	/* Post card if necessary */
>>-	if (amdgpu_vpost_needed(adev)) {
>>+	if (amdgpu_need_post(adev)) {
>> 		if (!adev->bios) {
>> 			dev_err(adev->dev, "no vBIOS found\n");
>> 			amdgpu_vf_error_put(AMDGIM_ERROR_VF_NO_VBIOS, 0, 0);
>>--
>>2.9.5
>>