[PATCH 5/6] drm/amdgpu: implement grab dedicated vmid V2

[zhoucm1]

On 2017年04月27日 10:52, Zhang, Jerry (Junwei) wrote:
> On 04/26/2017 07:10 PM, Chunming Zhou wrote:
>> v2: move sync waiting only when flush needs
>>
>> Change-Id: I64da2701c9fdcf986afb90ba1492a78d5bef1b6c
>> Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 61 
>> ++++++++++++++++++++++++++++++++++
>>   1 file changed, 61 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> index 214ac50..bce7701 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> @@ -402,6 +402,63 @@ static bool 
>> amdgpu_vm_dedicated_vmid_ready(struct amdgpu_vm *vm, unsigned vmhub)
>>       return !!vm->dedicated_vmid[vmhub];
>>   }
>>
>> +static int amdgpu_vm_grab_dedicated_vmid(struct amdgpu_vm *vm,
>> +                     struct amdgpu_ring *ring,
>> +                     struct amdgpu_sync *sync,
>> +                     struct fence *fence,
>> +                     struct amdgpu_job *job)
>> +{
>> +    struct amdgpu_device *adev = ring->adev;
>> +    unsigned vmhub = ring->funcs->vmhub;
>> +    struct amdgpu_vm_id *id = vm->dedicated_vmid[vmhub];
>> +    struct amdgpu_vm_id_manager *id_mgr = 
>> &adev->vm_manager.id_mgr[vmhub];
>> +    struct fence *updates = sync->last_vm_update;
>> +    int r = 0;
>> +    struct fence *flushed, *tmp;
>> +    bool needs_flush = false;
>> +
>> +    mutex_lock(&id_mgr->lock);
>> +    if (amdgpu_vm_had_gpu_reset(adev, id))
>> +        needs_flush = true;
>> +
>> +    flushed  = id->flushed_updates;
>> +    if (updates && (!flushed || updates->context != flushed->context ||
>> +            fence_is_later(updates, flushed)))
>> +        needs_flush = true;
>
> Just question:
> Do we need to consider concurrent flush for Vega10 like grab id func?
Christian has pointed that old asic has hardware bug.

Regards,
David Zhou
>
> Jerry
>
>> +    if (needs_flush) {
>> +        tmp = amdgpu_sync_get_fence(&id->active);
>> +        if (tmp) {
>> +            r = amdgpu_sync_fence(adev, sync, tmp);
>> +            fence_put(tmp);
>> +            mutex_unlock(&id_mgr->lock);
>> +            return r;
>> +        }
>> +    }
>> +
>> +    /* Good we can use this VMID. Remember this submission as
>> +    * user of the VMID.
>> +    */
>> +    r = amdgpu_sync_fence(ring->adev, &id->active, fence);
>> +    if (r)
>> +        goto out;
>> +
>> +    if (updates && (!flushed || updates->context != flushed->context ||
>> +            fence_is_later(updates, flushed))) {
>> +        fence_put(id->flushed_updates);
>> +        id->flushed_updates = fence_get(updates);
>> +    }
>> +    id->pd_gpu_addr = job->vm_pd_addr;
>> +    id->current_gpu_reset_count = 
>> atomic_read(&adev->gpu_reset_counter);
>> +    atomic64_set(&id->owner, vm->client_id);
>> +    job->vm_needs_flush = needs_flush;
>> +
>> +    job->vm_id = id - id_mgr->ids;
>> +    trace_amdgpu_vm_grab_id(vm, ring, job);
>> +out:
>> +    mutex_unlock(&id_mgr->lock);
>> +    return r;
>> +}
>> +
>>   /**
>>    * amdgpu_vm_grab_id - allocate the next free VMID
>>    *
>> @@ -426,6 +483,10 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, 
>> struct amdgpu_ring *ring,
>>       unsigned i;
>>       int r = 0;
>>
>> +    if (amdgpu_vm_dedicated_vmid_ready(vm, vmhub))
>> +        return amdgpu_vm_grab_dedicated_vmid(vm, ring, sync,
>> +                             fence, job);
>> +
>>       fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, 
>> GFP_KERNEL);
>>       if (!fences)
>>           return -ENOMEM;
>>
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