[PATCH] drm/amdgpu: Reserve fence slots for command submission

[PATCH] drm/amdgpu: Reserve fence slots for command submission

[Junwei Zhang]

From: Michel Dänzer <michel.daenzer@amd.com>

Without this, there could not be enough slots, which could trigger the
BUG_ON in reservation_object_add_shared_fence.

v2:
* Jump to the error label instead of returning directly (Jerry Zhang)
v3:
* Reserve slots for command submission after VM updates (Christian König)

Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/106418
Reported-by: mikhail.v.gavrilov@gmail.com
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 7a625f3..1bc0281 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -928,6 +928,10 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
 		r = amdgpu_bo_vm_update_pte(p);
 		if (r)
 			return r;
+
+		r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv);
+		if (r)
+			return r;
 	}
 
 	return amdgpu_cs_sync_rings(p);
-- 
1.9.1

[PATCH] drm/amdgpu: Reserve fence slots for command submission

[Junwei Zhang]

From: Michel Dänzer <michel.daenzer@amd.com>

Without this, there could not be enough slots, which could trigger the
BUG_ON in reservation_object_add_shared_fence.

v2:
* Jump to the error label instead of returning directly (Jerry Zhang)
v3:
* Reserve slots for command submission after VM updates (Christian König)

Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/106418
Reported-by: mikhail.v.gavrilov@gmail.com
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 7a625f3..1bc0281 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -928,6 +928,10 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
 		r = amdgpu_bo_vm_update_pte(p);
 		if (r)
 			return r;
+
+		r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv);
+		if (r)
+			return r;
 	}
 
 	return amdgpu_cs_sync_rings(p);
-- 
1.9.1

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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Christian König]

Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
> From: Michel Dänzer <michel.daenzer@amd.com>
>
> Without this, there could not be enough slots, which could trigger the
> BUG_ON in reservation_object_add_shared_fence.
>
> v2:
> * Jump to the error label instead of returning directly (Jerry Zhang)
> v3:
> * Reserve slots for command submission after VM updates (Christian König)
>
> Cc: stable@vger.kernel.org
> Bugzilla: https://bugs.freedesktop.org/106418
> Reported-by: mikhail.v.gavrilov@gmail.com
> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>

I would put that at the end of amdgpu_bo_vm_update_pte(), but that is 
only a minor nit pick.

Patch is Reviewed-by: Christian König <christian.koenig@amd.com> anyway.

Regards,
Christian.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index 7a625f3..1bc0281 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -928,6 +928,10 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
>   		r = amdgpu_bo_vm_update_pte(p);
>   		if (r)
>   			return r;
> +
> +		r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv);
> +		if (r)
> +			return r;
>   	}
>   
>   	return amdgpu_cs_sync_rings(p);

Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Zhang, Jerry (Junwei)]

On 07/04/2018 02:34 PM, Christian König wrote:
> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>> From: Michel Dänzer <michel.daenzer@amd.com>
>>
>> Without this, there could not be enough slots, which could trigger the
>> BUG_ON in reservation_object_add_shared_fence.
>>
>> v2:
>> * Jump to the error label instead of returning directly (Jerry Zhang)
>> v3:
>> * Reserve slots for command submission after VM updates (Christian König)
>>
>> Cc: stable@vger.kernel.org
>> Bugzilla: https://bugs.freedesktop.org/106418
>> Reported-by: mikhail.v.gavrilov@gmail.com
>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>
> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is only a minor nit pick.

At first, I really put it at the end of amdgpu_bo_vm_update_pte().
On the 2nd thought, that func may be called by others(although it's not for now),
so I move it out of there to the caller.

Jerry

>
> Patch is Reviewed-by: Christian König <christian.koenig@amd.com> anyway.
>
> Regards,
> Christian.
>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> index 7a625f3..1bc0281 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> @@ -928,6 +928,10 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
>>           r = amdgpu_bo_vm_update_pte(p);
>>           if (r)
>>               return r;
>> +
>> +        r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv);
>> +        if (r)
>> +            return r;
>>       }
>>       return amdgpu_cs_sync_rings(p);
>

Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Zhang, Jerry (Junwei)]

On 07/04/2018 02:34 PM, Christian König wrote:
> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>> From: Michel Dänzer <michel.daenzer@amd.com>
>>
>> Without this, there could not be enough slots, which could trigger the
>> BUG_ON in reservation_object_add_shared_fence.
>>
>> v2:
>> * Jump to the error label instead of returning directly (Jerry Zhang)
>> v3:
>> * Reserve slots for command submission after VM updates (Christian König)
>>
>> Cc: stable@vger.kernel.org
>> Bugzilla: https://bugs.freedesktop.org/106418
>> Reported-by: mikhail.v.gavrilov@gmail.com
>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>
> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is only a minor nit pick.

At first, I really put it at the end of amdgpu_bo_vm_update_pte().
On the 2nd thought, that func may be called by others(although it's not for now),
so I move it out of there to the caller.

Jerry

>
> Patch is Reviewed-by: Christian König <christian.koenig@amd.com> anyway.
>
> Regards,
> Christian.
>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> index 7a625f3..1bc0281 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>> @@ -928,6 +928,10 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
>>           r = amdgpu_bo_vm_update_pte(p);
>>           if (r)
>>               return r;
>> +
>> +        r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv);
>> +        if (r)
>> +            return r;
>>       }
>>       return amdgpu_cs_sync_rings(p);
>

Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Michel Dänzer]

On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
> On 07/04/2018 02:34 PM, Christian König wrote:
>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>
>>> Without this, there could not be enough slots, which could trigger the
>>> BUG_ON in reservation_object_add_shared_fence.
>>>
>>> v2:
>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>> v3:
>>> * Reserve slots for command submission after VM updates (Christian
>>> König)
>>>
>>> Cc: stable@vger.kernel.org
>>> Bugzilla: https://bugs.freedesktop.org/106418
>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>
>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>> only a minor nit pick.
> 
> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
> On the 2nd thought, that func may be called by others(although it's not
> for now), so I move it out of there to the caller.

Makes sense to me, FWIW. Thanks Junwei and Christian!


P.S. Christian, any feedback on
https://patchwork.freedesktop.org/patch/232204/ ?

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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Zhang, Jerry (Junwei)]

On 07/04/2018 03:21 PM, Michel Dänzer wrote:
> On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
>> On 07/04/2018 02:34 PM, Christian König wrote:
>>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>
>>>> Without this, there could not be enough slots, which could trigger the
>>>> BUG_ON in reservation_object_add_shared_fence.
>>>>
>>>> v2:
>>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>>> v3:
>>>> * Reserve slots for command submission after VM updates (Christian
>>>> König)
>>>>
>>>> Cc: stable@vger.kernel.org
>>>> Bugzilla: https://bugs.freedesktop.org/106418
>>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>>
>>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>>> only a minor nit pick.
>>
>> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
>> On the 2nd thought, that func may be called by others(although it's not
>> for now), so I move it out of there to the caller.
>
> Makes sense to me, FWIW. Thanks Junwei and Christian!

Please confirm if that works in your side.
If yes, I would push that to drm-next then.

Thanks.

Jerry

>
>
> P.S. Christian, any feedback on
> https://patchwork.freedesktop.org/patch/232204/ ?
>
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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Christian König]

Am 04.07.2018 um 09:57 schrieb Zhang, Jerry (Junwei):
> On 07/04/2018 03:21 PM, Michel Dänzer wrote:
>> On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
>>> On 07/04/2018 02:34 PM, Christian König wrote:
>>>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>>
>>>>> Without this, there could not be enough slots, which could trigger 
>>>>> the
>>>>> BUG_ON in reservation_object_add_shared_fence.
>>>>>
>>>>> v2:
>>>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>>>> v3:
>>>>> * Reserve slots for command submission after VM updates (Christian
>>>>> König)
>>>>>
>>>>> Cc: stable@vger.kernel.org
>>>>> Bugzilla: https://bugs.freedesktop.org/106418
>>>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>>>
>>>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>>>> only a minor nit pick.
>>>
>>> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
>>> On the 2nd thought, that func may be called by others(although it's not
>>> for now), so I move it out of there to the caller.

Well that is exactly the reason I wanted to have it in 
amdgpu_bo_vm_update_pte() :)

But you are right, there are good arguments for both approach and as 
long as we don't have a second user it doesn't matter.

Christian.

>>
>> Makes sense to me, FWIW. Thanks Junwei and Christian!
>
> Please confirm if that works in your side.
> If yes, I would push that to drm-next then.
>
> Thanks.
>
> Jerry
>
>>
>>
>> P.S. Christian, any feedback on
>> https://patchwork.freedesktop.org/patch/232204/ ?
>>

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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Michel Dänzer]

On 2018-07-04 11:01 AM, Christian König wrote:
> Am 04.07.2018 um 09:57 schrieb Zhang, Jerry (Junwei):
>> On 07/04/2018 03:21 PM, Michel Dänzer wrote:
>>> On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
>>>> On 07/04/2018 02:34 PM, Christian König wrote:
>>>>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>>>
>>>>>> Without this, there could not be enough slots, which could trigger
>>>>>> the
>>>>>> BUG_ON in reservation_object_add_shared_fence.
>>>>>>
>>>>>> v2:
>>>>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>>>>> v3:
>>>>>> * Reserve slots for command submission after VM updates (Christian
>>>>>> König)
>>>>>>
>>>>>> Cc: stable@vger.kernel.org
>>>>>> Bugzilla: https://bugs.freedesktop.org/106418
>>>>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>>>>
>>>>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>>>>> only a minor nit pick.
>>>>
>>>> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
>>>> On the 2nd thought, that func may be called by others(although it's not
>>>> for now), so I move it out of there to the caller.
> 
> Well that is exactly the reason I wanted to have it in
> amdgpu_bo_vm_update_pte() :)
> 
> But you are right, there are good arguments for both approach and as
> long as we don't have a second user it doesn't matter.

In general, I think it's better to keep the
reservation_object_reserve_shared calls as close as possible to the
corresponding reservation_object_add_shared_fence calls, otherwise it's
hard to keep track of whether or not a slot is reserved at any given point.


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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Zhang, Jerry (Junwei)]

On 07/04/2018 05:15 PM, Michel Dänzer wrote:
> On 2018-07-04 11:01 AM, Christian König wrote:
>> Am 04.07.2018 um 09:57 schrieb Zhang, Jerry (Junwei):
>>> On 07/04/2018 03:21 PM, Michel Dänzer wrote:
>>>> On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
>>>>> On 07/04/2018 02:34 PM, Christian König wrote:
>>>>>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>>>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>>>>
>>>>>>> Without this, there could not be enough slots, which could trigger
>>>>>>> the
>>>>>>> BUG_ON in reservation_object_add_shared_fence.
>>>>>>>
>>>>>>> v2:
>>>>>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>>>>>> v3:
>>>>>>> * Reserve slots for command submission after VM updates (Christian
>>>>>>> König)
>>>>>>>
>>>>>>> Cc: stable@vger.kernel.org
>>>>>>> Bugzilla: https://bugs.freedesktop.org/106418
>>>>>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>>>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>>>>>
>>>>>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>>>>>> only a minor nit pick.
>>>>>
>>>>> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
>>>>> On the 2nd thought, that func may be called by others(although it's not
>>>>> for now), so I move it out of there to the caller.
>>
>> Well that is exactly the reason I wanted to have it in
>> amdgpu_bo_vm_update_pte() :)
>>
>> But you are right, there are good arguments for both approach and as
>> long as we don't have a second user it doesn't matter.
>
> In general, I think it's better to keep the
> reservation_object_reserve_shared calls as close as possible to the
> corresponding reservation_object_add_shared_fence calls, otherwise it's
> hard to keep track of whether or not a slot is reserved at any given point.

Agree, I also consider that previously, just before the command submission.
while I think 2 more things then:

1) amdgpu_cs_ib_vm_chunk() is unique func during cs ioctl,
in another word, it's a MUST part of that, so it will not impact others.
Additionally it also checks if vm used, otherwise, the reserve is not needed either.

2) adding the reserve with vm checking in amdgpu_cs_submit() looks not so good as well.
IMO. so I decide to insert that in amdgpu_cs_ib_vm_chunk() vm existing case.

BTW, we may add some comments in code as well to better reference in the future.

Jerry

>
>
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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Michel Dänzer]

On 2018-07-04 09:57 AM, Zhang, Jerry (Junwei) wrote:
> On 07/04/2018 03:21 PM, Michel Dänzer wrote:
>> On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
>>> On 07/04/2018 02:34 PM, Christian König wrote:
>>>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>>
>>>>> Without this, there could not be enough slots, which could trigger the
>>>>> BUG_ON in reservation_object_add_shared_fence.
>>>>>
>>>>> v2:
>>>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>>>> v3:
>>>>> * Reserve slots for command submission after VM updates (Christian
>>>>> König)
>>>>>
>>>>> Cc: stable@vger.kernel.org
>>>>> Bugzilla: https://bugs.freedesktop.org/106418
>>>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>>>
>>>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>>>> only a minor nit pick.
>>>
>>> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
>>> On the 2nd thought, that func may be called by others(although it's not
>>> for now), so I move it out of there to the caller.
>>
>> Makes sense to me, FWIW. Thanks Junwei and Christian!
> 
> Please confirm if that works in your side.
> If yes, I would push that to drm-next then.

Go ahead, seems fine.


P.S. Maybe the shortlog could be more specific, e.g.

drm/amdgpu: Reserve VM root shared fence slot for command submission

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Re: [PATCH] drm/amdgpu: Reserve fence slots for command submission

[Christian König]

Am 04.07.2018 um 09:21 schrieb Michel Dänzer:
> On 2018-07-04 08:55 AM, Zhang, Jerry (Junwei) wrote:
>> On 07/04/2018 02:34 PM, Christian König wrote:
>>> Am 04.07.2018 um 05:02 schrieb Junwei Zhang:
>>>> From: Michel Dänzer <michel.daenzer@amd.com>
>>>>
>>>> Without this, there could not be enough slots, which could trigger the
>>>> BUG_ON in reservation_object_add_shared_fence.
>>>>
>>>> v2:
>>>> * Jump to the error label instead of returning directly (Jerry Zhang)
>>>> v3:
>>>> * Reserve slots for command submission after VM updates (Christian
>>>> König)
>>>>
>>>> Cc: stable@vger.kernel.org
>>>> Bugzilla: https://bugs.freedesktop.org/106418
>>>> Reported-by: mikhail.v.gavrilov@gmail.com
>>>> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
>>>> Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
>>> I would put that at the end of amdgpu_bo_vm_update_pte(), but that is
>>> only a minor nit pick.
>> At first, I really put it at the end of amdgpu_bo_vm_update_pte().
>> On the 2nd thought, that func may be called by others(although it's not
>> for now), so I move it out of there to the caller.
> Makes sense to me, FWIW. Thanks Junwei and Christian!
>
>
> P.S. Christian, any feedback on
> https://patchwork.freedesktop.org/patch/232204/ ?

Just did, thanks for pointing that out once more.

Read the mail during my vacation, but forgot to answer it on Monday.

Christian.
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