Am 26.04.2017 um 11:04 schrieb Zhang, Jerry (Junwei):
> On 04/26/2017 04:51 PM, Christian König wrote:
>> Am 26.04.2017 um 09:09 schrieb Zhang, Jerry (Junwei):
>>>
>>>
>>> On 04/24/2017 01:57 PM, Chunming Zhou wrote:
>>>> Change-Id: I5f80dc39dc9d44660a96a2b710b0dbb4d3b9039d
>>>> Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
>>>> ---
>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 56
>>>> ++++++++++++++++++++++++++++++++++
>>>> 1 file changed, 56 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>>> index acf9102..5f4dcc9 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>>> @@ -397,6 +397,17 @@ static bool amdgpu_vm_had_gpu_reset(struct
>>>> amdgpu_device *adev,
>>>> atomic_read(&adev->gpu_reset_counter);
>>>> }
>>>>
>>>> +static bool amdgpu_vm_dedicated_vmid_ready(struct amdgpu_vm *vm)
>>>> +{
>>>> + unsigned vmhub;
>>>> +
>>>> + for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++) {
>>>> + if (!vm->dedicated_vmid[vmhub])
>>>> + return false;
>>>
>>> Just note:
>>> Seemingly for pre-gmcv9, it will always allocate one more
>>> dedicated/reserved
>>> vmid for the 2nd un-used vmhub.
>>> anyway it will not be used either.
>>
>> It's even worse. IIRC we don't initialize the 2nd hub on pre-gmcv9.
>> So that
>> could work with uninitialized data.
>
> I saw AMDGPU_MAX_VMHUBS is defined 2 for all ASICs.
> So the 2nd dedicated_vmid here will be 0 always, returning false.
> Right?
>
> Additionally, in amdgpu_vm_manager_init() the id_mgr[i] is initialized
> in loop of AMDGPU_MAX_VMHUBS as well.
> Thus I though both vmhub are initialized.
> Any missing, please correct me.
> Thanks.
Indeed you are right we do always initialize all HUBs here, so that
should work but is still a bit awkward.
Christian.
>
> Jerry
>
>>
>> Christian.
>>
>>>
>>> Jerry
>>>> + }
>>>> + return true;
>>>> +}
>>>> +
>>>> /**
>>>> * amdgpu_vm_grab_id - allocate the next free VMID
>>>> *
>>>> @@ -546,6 +557,45 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm,
>>>> struct
>>>> amdgpu_ring *ring,
>>>> return r;
>>>> }
>>>>
>>>> +static int amdgpu_vm_alloc_dedicated_vmid(struct amdgpu_device *adev,
>>>> + struct amdgpu_vm *vm)
>>>> +{
>>>> + struct amdgpu_vm_id_manager *id_mgr;
>>>> + struct amdgpu_vm_id *idle;
>>>> + unsigned vmhub;
>>>> + int r;
>>>> +
>>>> + for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++) {
>>>> + id_mgr = &adev->vm_manager.id_mgr[vmhub];
>>>> +
>>>> + mutex_lock(&id_mgr->lock);
>>>> + /* Select the first entry VMID */
>>>> + idle = list_first_entry(&id_mgr->ids_lru, struct
>>>> amdgpu_vm_id,
>>>> + list);
>>>> + list_del_init(&idle->list);
>>>> + vm->dedicated_vmid[vmhub] = idle;
>>>> + mutex_unlock(&id_mgr->lock);
>>>> +
>>>> + r = amdgpu_sync_wait(&idle->active);
>>>> + if (r)
>>>> + goto err;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +err:
>>>> + for (vmhub = 0; vmhub < AMDGPU_MAX_VMHUBS; vmhub++) {
>>>> + id_mgr = &adev->vm_manager.id_mgr[vmhub];
>>>> +
>>>> + mutex_lock(&id_mgr->lock);
>>>> + if (vm->dedicated_vmid[vmhub])
>>>> + list_add(&vm->dedicated_vmid[vmhub]->list,
>>>> + &id_mgr->ids_lru);
>>>> + vm->dedicated_vmid[vmhub] = NULL;
>>>> + mutex_unlock(&id_mgr->lock);
>>>> + }
>>>> + return r;
>>>> +}
>>>> +
>>>> static bool amdgpu_vm_ring_has_compute_vm_bug(struct amdgpu_ring
>>>> *ring)
>>>> {
>>>> struct amdgpu_device *adev = ring->adev;
>>>> @@ -2379,9 +2429,15 @@ int amdgpu_vm_ioctl(struct drm_device *dev,
>>>> void
>>>> *data, struct drm_file *filp)
>>>> union drm_amdgpu_vm *args = data;
>>>> struct amdgpu_device *adev = dev->dev_private;
>>>> struct amdgpu_fpriv *fpriv = filp->driver_priv;
>>>> + int r;
>>>>
>>>> switch (args->in.op) {
>>>> case AMDGPU_VM_OP_RESERVE_VMID:
>>>> + if (!amdgpu_vm_dedicated_vmid_ready(&fpriv->vm)) {
>>>> + r = amdgpu_vm_alloc_dedicated_vmid(adev, &fpriv->vm);
>>>
>>> Could you change the return value in this ready checking func?
>>> Usually we can easily get to know this kind of things.
>>> if (sth_ready())
>>> do_sth();
>>>
>>>
>>>> + if (r)
>>>> + return r;
>>>> + }
>>>> break;
>>>> default:
>>>> return -EINVAL;
>>>>
>>> _______________________________________________
>>> amd-gfx mailing list
>>> amd-gfx at lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>
>>
