See amdgpu_gpu_reset():
> /* block scheduler */
> for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> struct amdgpu_ring *ring = adev->rings[i];
>
> if (!ring)
> continue;
> kthread_park(ring->sched.thread);
> amd_sched_hw_job_reset(&ring->sched);
> }
and
> for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
> struct amdgpu_ring *ring = adev->rings[i];
> if (!ring)
> continue;
>
> amd_sched_job_recovery(&ring->sched);
> kthread_unpark(ring->sched.thread);
> }
Regards,
Christian.
Am 21.04.2017 um 11:54 schrieb He, Hongbo:
>> During GPU reset, IOCTL still submit command to GPU.
> No it won't. We disable the GPU scheduler during GPU reset, so that isn't an issue.
> Could you point out the related code? Thanks.
>
>
> Thanks
> Roger(Hongbo.He)
>
> -----Original Message-----
> From: Christian König [mailto:deathsimple at vodafone.de]
> Sent: Friday, April 21, 2017 5:16 PM
> To: He, Hongbo; amd-gfx at lists.freedesktop.org
> Cc: Zhou, David(ChunMing)
> Subject: Re: [PATCH 3/3] drm/amdgpu: fix gpu reset issue
>
>> During GPU reset, IOCTL still submit command to GPU.
> No it won't. We disable the GPU scheduler during GPU reset, so that isn't an issue.
>
> Do you have a concrete problem (e.g. dmesg?) you ran into?
>
> Regards,
> Christian.
>
> Am 21.04.2017 um 11:00 schrieb He, Hongbo:
>> Hi Christian:
>>
>> During GPU reset, IOCTL still submit command to GPU.
>> That will result in lots of strange problems when we test this feature.
>>
>> I have no better idea to handle this case. At that time, I have tried with return error directly rather than waiting GPU reset completion.
>> But that doesn't work and it lead to other problems.
>>
>> Thanks
>> Roger(Hongbo.He)
>>
>> -----Original Message-----
>> From: Christian König [mailto:deathsimple at vodafone.de]
>> Sent: Friday, April 21, 2017 4:27 PM
>> To: He, Hongbo; amd-gfx at lists.freedesktop.org
>> Cc: Zhou, David(ChunMing)
>> Subject: Re: [PATCH 3/3] drm/amdgpu: fix gpu reset issue
>>
>> NAK, that is exactly what we wanted to avoid.
>>
>> We used to have an exclusive lock for this and it cause a whole bunch of problems.
>>
>> Please elaborate why that should be necessary.
>>
>> Regards,
>> Christian.
>>
>> Am 21.04.2017 um 09:08 schrieb Roger.He:
>>> Change-Id: Ib77d33a09f348ebf2e3a9d7861411f4b951ebf7c
>>> Signed-off-by: Roger.He <Hongbo.He at amd.com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 6 ++++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 16 +++++++++++++++-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 ++++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_ioc32.c | 7 ++++++-
>>> 4 files changed, 31 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> index 71364f5..ab0ffa8 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
>>> @@ -1526,6 +1526,7 @@ struct amdgpu_device {
>>> atomic64_t num_bytes_moved;
>>> atomic64_t num_evictions;
>>> atomic_t gpu_reset_counter;
>>> + atomic_t gpu_reset_state;
>>>
>>> /* data for buffer migration throttling */
>>> struct {
>>> @@ -1851,6 +1852,11 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
>>> #define amdgpu_psp_check_fw_loading_status(adev, i)
>>> (adev)->firmware.funcs->check_fw_loading_status((adev), (i))
>>>
>>> /* Common functions */
>>> +static inline int amdgpu_device_is_reset(struct amdgpu_device *adev)
>>> +{
>>> + return atomic_read(&adev->gpu_reset_state);
>>> +}
>>> +
>>> int amdgpu_gpu_reset(struct amdgpu_device *adev);
>>> bool amdgpu_need_backup(struct amdgpu_device *adev);
>>> void amdgpu_pci_config_reset(struct amdgpu_device *adev); diff
>>> --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> index f882496..0fb4716 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>>> @@ -1894,6 +1894,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>>> mutex_init(&adev->grbm_idx_mutex);
>>> mutex_init(&adev->mn_lock);
>>> hash_init(adev->mn_hash);
>>> + atomic_set(&adev->gpu_reset_state, 0);
>>>
>>> amdgpu_check_arguments(adev);
>>>
>>> @@ -2655,6 +2656,18 @@ int amdgpu_sriov_gpu_reset(struct amdgpu_device *adev, bool voluntary)
>>> }
>>>
>>> /**
>>> + * amdgpu_device_set_reset_state - set gpu reset state
>>> + *
>>> + * @adev: amdgpu device pointer
>>> + * @state: true when start to reset gpu; false: reset done */
>>> +static inline void amdgpu_device_set_reset_state(struct amdgpu_device *adev,
>>> + bool state)
>>> +{
>>> + atomic_set(&adev->gpu_reset_state, state); }
>>> +
>>> +/**
>>> * amdgpu_gpu_reset - reset the asic
>>> *
>>> * @adev: amdgpu device pointer
>>> @@ -2678,7 +2691,7 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
>>> }
>>>
>>> atomic_inc(&adev->gpu_reset_counter);
>>> -
>>> + amdgpu_device_set_reset_state(adev, true);
>>> /* block TTM */
>>> resched = ttm_bo_lock_delayed_workqueue(&adev->mman.bdev);
>>> /* store modesetting */
>>> @@ -2811,6 +2824,7 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
>>> dev_info(adev->dev, "GPU reset failed\n");
>>> }
>>>
>>> + amdgpu_device_set_reset_state(adev, false);
>>> return r;
>>> }
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> index ead00d7..8cc14af 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>>> @@ -679,11 +679,15 @@ long amdgpu_drm_ioctl(struct file *filp,
>>> struct drm_file *file_priv = filp->private_data;
>>> struct drm_device *dev;
>>> long ret;
>>> +
>>> dev = file_priv->minor->dev;
>>> ret = pm_runtime_get_sync(dev->dev);
>>> if (ret < 0)
>>> return ret;
>>>
>>> + while (amdgpu_device_is_reset(dev->dev_private))
>>> + msleep(100);
>>> +
>>> ret = drm_ioctl(filp, cmd, arg);
>>>
>>> pm_runtime_mark_last_busy(dev->dev);
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ioc32.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ioc32.c
>>> index 2648291..22b8059 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ioc32.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ioc32.c
>>> @@ -36,10 +36,15 @@
>>> long amdgpu_kms_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>>> {
>>> unsigned int nr = DRM_IOCTL_NR(cmd);
>>> + struct drm_file *file_priv = filp->private_data;
>>> + struct amdgpu_device *adev = file_priv->minor->dev->dev_private;
>>> int ret;
>>>
>>> - if (nr < DRM_COMMAND_BASE)
>>> + if (nr < DRM_COMMAND_BASE) {
>>> + while (amdgpu_device_is_reset(adev))
>>> + msleep(100);
>>> return drm_compat_ioctl(filp, cmd, arg);
>>> + }
>>>
>>> ret = amdgpu_drm_ioctl(filp, cmd, arg);
>>>
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> amd-gfx at lists.freedesktop.org
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