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.
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;
>>>
>> _______________________________________________
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>> amd-gfx at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>
>
