Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

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To elaborate on the PTRACE test, we PEEK 2 DWORDs inside thunk allocated mapped memory and 2 DWORDS outside that boundary (it’s only about 4MB to the boundary).  Then we POKE to swap the DWORD positions across the boundary.  The RAS event on the single failing machine happens on the out of boundary PEEK.


Well when you access outside of an allocated buffer I would expect that we never get as far as even touching the hardware because the kernel should block the access with an -EPERM or -EFAULT. So sounds like I'm not understanding something correctly here.

Apart from that I completely agree that we need to sort out any other RAS event first to make sure that the system is simply not failing randomly.

Regards,
Christian.

Am 15.04.20 um 11:49 schrieb Kim, Jonathan:

[AMD Public Use]

 

Hi Christian,

 

That could potentially be it.  With additional testing, 2 of 3 Vega20 machines never hit error over BAR access with the PTRACE test.  3 of 3 machines (from the same pool) always hit error with CWSR.

To elaborate on the PTRACE test, we PEEK 2 DWORDs inside thunk allocated mapped memory and 2 DWORDS outside that boundary (it’s only about 4MB to the boundary).  Then we POKE to swap the DWORD positions across the boundary.  The RAS event on the single failing machine happens on the out of boundary PEEK.

 

Felix mentioned we don’t hit errors over general HDP access but that may not true.  An Arcturus failure sys logs posted (which wasn’t tested by me) shows someone launched rocm bandwidth test, hit a VM fault and a RAS event ensued during evictions (I can point the internal ticket or log snippet offline if interested).  Whether the RAS event is BAR access triggered or the result of HW instability is beyond me since I don’t have access to the machine.

 

Thanks,

 

Jon

 

From: Koenig, Christian <Christian.Koenig@xxxxxxx>
Sent: Wednesday, April 15, 2020 4:11 AM
To: Kim, Jonathan <Jonathan.Kim@xxxxxxx>; Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>
Cc: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

Hi Jon,

Also cwsr tests fail on Vega20 with or without the revert with the same RAS error.


That sounds like the system/setup has a more general problem.

Could it be that we are seeing RAS errors because there really is some hardware failure, but with the MM path we don't trigger a RAS interrupt?

Thanks,
Christian.

Am 14.04.20 um 22:30 schrieb Kim, Jonathan:

[AMD Official Use Only - Internal Distribution Only]

 

If we’re passing the test on the revert, then the only thing that’s different is we’re not invalidating HDP and doing a copy to host anymore in amdgpu_device_vram_access since the function is still called in ttm access_memory with BAR.

 

Also cwsr tests fail on Vega20 with or without the revert with the same RAS error.

 

Thanks,

 

Jon

 

From: Kuehling, Felix <Felix.Kuehling@xxxxxxx>
Sent: Tuesday, April 14, 2020 2:32 PM
To: Kim, Jonathan <Jonathan.Kim@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>
Cc: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

I wouldn't call it premature. Revert is a usual practice when there is a serious regression that isn't fully understood or root-caused. As far as I can tell, the problem has been reproduced on multiple systems, different GPUs, and clearly regressed to Christian's commit. I think that justifies reverting it for now.

I agree with Christian that a general HDP memory access problem causing RAS errors would potentially cause problems in other tests as well. For example common operations like GART table updates, and GPUVM page table updates and PCIe peer2peer accesses in ROCm applications use HDP. But we're not seeing obvious problems from those. So we need to understand what's special about this test. I asked questions to that effect on our other email thread.

Regards,
  Felix

Am 2020-04-14 um 10:51 a.m. schrieb Kim, Jonathan:

[AMD Official Use Only - Internal Distribution Only]

 

I think it’s premature to push this revert.

 

With more testing, I’m getting failures from different tests or sometimes none at all on my machine.

 

Kent, let’s continue the discussion on the original thread.

 

Thanks,

 

Jon

 

From: Koenig, Christian <Christian.Koenig@xxxxxxx>
Sent: Tuesday, April 14, 2020 10:47 AM
To: Deucher, Alexander <Alexander.Deucher@xxxxxxx>
Cc: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>
Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

That's exactly my concern as well.

 

This looks a bit like the test creates erroneous data somehow, but there doesn't seems to be a RAS check in the MM data path.

 

And now that we use the BAR path it goes up in flames.

 

I just don't see how we can create erroneous data in a test case?

 

Christian.

 

Am 14.04.2020 16:35 schrieb "Deucher, Alexander" <Alexander.Deucher@xxxxxxx>:

[AMD Public Use]

 

If this causes an issue, any access to vram via the BAR could cause an issue.

 

Alex

From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Russell, Kent <Kent.Russell@xxxxxxx>
Sent: Tuesday, April 14, 2020 10:19 AM
To: Koenig, Christian <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>
Subject: RE: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

[AMD Official Use Only - Internal Distribution Only]

On VG20 or MI100, as soon as we run the subtest, we get the dmesg output below, and then the kernel ends up hanging. I don't know enough about the test itself to know why this is occurring, but Jon Kim and Felix were discussing it on a separate thread when the issue was first reported, so they can hopefully provide some additional information.

 Kent

> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
> Sent: Tuesday, April 14, 2020 9:52 AM
> To: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in
> amdgpu_device_vram_access v2"
>
> Am 13.04.20 um 20:20 schrieb Kent Russell:
> > This reverts commit c12b84d6e0d70f1185e6daddfd12afb671791b6e.
> > The original patch causes a RAS event and subsequent kernel hard-hang
> > when running the KFDMemoryTest.PtraceAccessInvisibleVram on VG20 and
> > Arcturus
> >
> > dmesg output at hang time:
> > [drm] RAS event of type ERREVENT_ATHUB_INTERRUPT detected!
> > amdgpu 0000:67:00.0: GPU reset begin!
> > Evicting PASID 0x8000 queues
> > Started evicting pasid 0x8000
> > qcm fence wait loop timeout expired
> > The cp might be in an unrecoverable state due to an unsuccessful
> > queues preemption Failed to evict process queues Failed to suspend
> > process 0x8000 Finished evicting pasid 0x8000 Started restoring pasid
> > 0x8000 Finished restoring pasid 0x8000 [drm] UVD VCPU state may lost
> > due to RAS ERREVENT_ATHUB_INTERRUPT
> > amdgpu: [powerplay] Failed to send message 0x26, response 0x0
> > amdgpu: [powerplay] Failed to set soft min gfxclk !
> > amdgpu: [powerplay] Failed to upload DPM Bootup Levels!
> > amdgpu: [powerplay] Failed to send message 0x7, response 0x0
> > amdgpu: [powerplay] [DisableAllSMUFeatures] Failed to disable all smu
> features!
> > amdgpu: [powerplay] [DisableDpmTasks] Failed to disable all smu features!
> > amdgpu: [powerplay] [PowerOffAsic] Failed to disable DPM!
> > [drm:amdgpu_device_ip_suspend_phase2 [amdgpu]] *ERROR* suspend of IP
> > block <powerplay> failed -5
>
> Do you have more information on what's going wrong here since this is a really
> important patch for KFD debugging.
>
> >
> > Signed-off-by: Kent Russell <kent.russell@xxxxxxx>
>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ----------------------
> >   1 file changed, 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index cf5d6e585634..a3f997f84020 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -254,32 +254,6 @@ void amdgpu_device_vram_access(struct
> amdgpu_device *adev, loff_t pos,
> >      uint32_t hi = ~0;
> >      uint64_t last;
> >
> > -
> > -#ifdef CONFIG_64BIT
> > -   last = min(pos + size, adev->gmc.visible_vram_size);
> > -   if (last > pos) {
> > -           void __iomem *addr = adev->mman.aper_base_kaddr + pos;
> > -           size_t count = last - pos;
> > -
> > -           if (write) {
> > -                   memcpy_toio(addr, buf, count);
> > -                   mb();
> > -                   amdgpu_asic_flush_hdp(adev, NULL);
> > -           } else {
> > -                   amdgpu_asic_invalidate_hdp(adev, NULL);
> > -                   mb();
> > -                   memcpy_fromio(buf, addr, count);
> > -           }
> > -
> > -           if (count == size)
> > -                   return;
> > -
> > -           pos += count;
> > -           buf += count / 4;
> > -           size -= count;
> > -   }
> > -#endif
> > -
> >      spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> >      for (last = pos + size; pos < last; pos += 4) {
> >              uint32_t tmp = pos >> 31;
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Am 14.04.2020 16:35 schrieb "Deucher, Alexander" <Alexander.Deucher@xxxxxxx>:

[AMD Public Use]

 

If this causes an issue, any access to vram via the BAR could cause an issue.

 

Alex

From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Russell, Kent <Kent.Russell@xxxxxxx>
Sent: Tuesday, April 14, 2020 10:19 AM
To: Koenig, Christian <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>
Subject: RE: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

[AMD Official Use Only - Internal Distribution Only]

On VG20 or MI100, as soon as we run the subtest, we get the dmesg output below, and then the kernel ends up hanging. I don't know enough about the test itself to know why this is occurring, but Jon Kim and Felix were discussing it on a separate thread when the issue was first reported, so they can hopefully provide some additional information.

 Kent

> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
> Sent: Tuesday, April 14, 2020 9:52 AM
> To: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in
> amdgpu_device_vram_access v2"
>
> Am 13.04.20 um 20:20 schrieb Kent Russell:
> > This reverts commit c12b84d6e0d70f1185e6daddfd12afb671791b6e.
> > The original patch causes a RAS event and subsequent kernel hard-hang
> > when running the KFDMemoryTest.PtraceAccessInvisibleVram on VG20 and
> > Arcturus
> >
> > dmesg output at hang time:
> > [drm] RAS event of type ERREVENT_ATHUB_INTERRUPT detected!
> > amdgpu 0000:67:00.0: GPU reset begin!
> > Evicting PASID 0x8000 queues
> > Started evicting pasid 0x8000
> > qcm fence wait loop timeout expired
> > The cp might be in an unrecoverable state due to an unsuccessful
> > queues preemption Failed to evict process queues Failed to suspend
> > process 0x8000 Finished evicting pasid 0x8000 Started restoring pasid
> > 0x8000 Finished restoring pasid 0x8000 [drm] UVD VCPU state may lost
> > due to RAS ERREVENT_ATHUB_INTERRUPT
> > amdgpu: [powerplay] Failed to send message 0x26, response 0x0
> > amdgpu: [powerplay] Failed to set soft min gfxclk !
> > amdgpu: [powerplay] Failed to upload DPM Bootup Levels!
> > amdgpu: [powerplay] Failed to send message 0x7, response 0x0
> > amdgpu: [powerplay] [DisableAllSMUFeatures] Failed to disable all smu
> features!
> > amdgpu: [powerplay] [DisableDpmTasks] Failed to disable all smu features!
> > amdgpu: [powerplay] [PowerOffAsic] Failed to disable DPM!
> > [drm:amdgpu_device_ip_suspend_phase2 [amdgpu]] *ERROR* suspend of IP
> > block <powerplay> failed -5
>
> Do you have more information on what's going wrong here since this is a really
> important patch for KFD debugging.
>
> >
> > Signed-off-by: Kent Russell <kent.russell@xxxxxxx>
>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ----------------------
> >   1 file changed, 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index cf5d6e585634..a3f997f84020 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -254,32 +254,6 @@ void amdgpu_device_vram_access(struct
> amdgpu_device *adev, loff_t pos,
> >      uint32_t hi = ~0;
> >      uint64_t last;
> >
> > -
> > -#ifdef CONFIG_64BIT
> > -   last = min(pos + size, adev->gmc.visible_vram_size);
> > -   if (last > pos) {
> > -           void __iomem *addr = adev->mman.aper_base_kaddr + pos;
> > -           size_t count = last - pos;
> > -
> > -           if (write) {
> > -                   memcpy_toio(addr, buf, count);
> > -                   mb();
> > -                   amdgpu_asic_flush_hdp(adev, NULL);
> > -           } else {
> > -                   amdgpu_asic_invalidate_hdp(adev, NULL);
> > -                   mb();
> > -                   memcpy_fromio(buf, addr, count);
> > -           }
> > -
> > -           if (count == size)
> > -                   return;
> > -
> > -           pos += count;
> > -           buf += count / 4;
> > -           size -= count;
> > -   }
> > -#endif
> > -
> >      spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> >      for (last = pos + size; pos < last; pos += 4) {
> >              uint32_t tmp = pos >> 31;
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Am 14.04.2020 16:35 schrieb "Deucher, Alexander" <Alexander.Deucher@xxxxxxx>:

[AMD Public Use]

 

If this causes an issue, any access to vram via the BAR could cause an issue.

 

Alex

From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Russell, Kent <Kent.Russell@xxxxxxx>
Sent: Tuesday, April 14, 2020 10:19 AM
To: Koenig, Christian <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>
Subject: RE: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

[AMD Official Use Only - Internal Distribution Only]

On VG20 or MI100, as soon as we run the subtest, we get the dmesg output below, and then the kernel ends up hanging. I don't know enough about the test itself to know why this is occurring, but Jon Kim and Felix were discussing it on a separate thread when the issue was first reported, so they can hopefully provide some additional information.

 Kent

> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
> Sent: Tuesday, April 14, 2020 9:52 AM
> To: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in
> amdgpu_device_vram_access v2"
>
> Am 13.04.20 um 20:20 schrieb Kent Russell:
> > This reverts commit c12b84d6e0d70f1185e6daddfd12afb671791b6e.
> > The original patch causes a RAS event and subsequent kernel hard-hang
> > when running the KFDMemoryTest.PtraceAccessInvisibleVram on VG20 and
> > Arcturus
> >
> > dmesg output at hang time:
> > [drm] RAS event of type ERREVENT_ATHUB_INTERRUPT detected!
> > amdgpu 0000:67:00.0: GPU reset begin!
> > Evicting PASID 0x8000 queues
> > Started evicting pasid 0x8000
> > qcm fence wait loop timeout expired
> > The cp might be in an unrecoverable state due to an unsuccessful
> > queues preemption Failed to evict process queues Failed to suspend
> > process 0x8000 Finished evicting pasid 0x8000 Started restoring pasid
> > 0x8000 Finished restoring pasid 0x8000 [drm] UVD VCPU state may lost
> > due to RAS ERREVENT_ATHUB_INTERRUPT
> > amdgpu: [powerplay] Failed to send message 0x26, response 0x0
> > amdgpu: [powerplay] Failed to set soft min gfxclk !
> > amdgpu: [powerplay] Failed to upload DPM Bootup Levels!
> > amdgpu: [powerplay] Failed to send message 0x7, response 0x0
> > amdgpu: [powerplay] [DisableAllSMUFeatures] Failed to disable all smu
> features!
> > amdgpu: [powerplay] [DisableDpmTasks] Failed to disable all smu features!
> > amdgpu: [powerplay] [PowerOffAsic] Failed to disable DPM!
> > [drm:amdgpu_device_ip_suspend_phase2 [amdgpu]] *ERROR* suspend of IP
> > block <powerplay> failed -5
>
> Do you have more information on what's going wrong here since this is a really
> important patch for KFD debugging.
>
> >
> > Signed-off-by: Kent Russell <kent.russell@xxxxxxx>
>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ----------------------
> >   1 file changed, 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index cf5d6e585634..a3f997f84020 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -254,32 +254,6 @@ void amdgpu_device_vram_access(struct
> amdgpu_device *adev, loff_t pos,
> >      uint32_t hi = ~0;
> >      uint64_t last;
> >
> > -
> > -#ifdef CONFIG_64BIT
> > -   last = min(pos + size, adev->gmc.visible_vram_size);
> > -   if (last > pos) {
> > -           void __iomem *addr = adev->mman.aper_base_kaddr + pos;
> > -           size_t count = last - pos;
> > -
> > -           if (write) {
> > -                   memcpy_toio(addr, buf, count);
> > -                   mb();
> > -                   amdgpu_asic_flush_hdp(adev, NULL);
> > -           } else {
> > -                   amdgpu_asic_invalidate_hdp(adev, NULL);
> > -                   mb();
> > -                   memcpy_fromio(buf, addr, count);
> > -           }
> > -
> > -           if (count == size)
> > -                   return;
> > -
> > -           pos += count;
> > -           buf += count / 4;
> > -           size -= count;
> > -   }
> > -#endif
> > -
> >      spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> >      for (last = pos + size; pos < last; pos += 4) {
> >              uint32_t tmp = pos >> 31;
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Am 14.04.2020 16:35 schrieb "Deucher, Alexander" <Alexander.Deucher@xxxxxxx>:

[AMD Public Use]

 

If this causes an issue, any access to vram via the BAR could cause an issue.

 

Alex

From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Russell, Kent <Kent.Russell@xxxxxxx>
Sent: Tuesday, April 14, 2020 10:19 AM
To: Koenig, Christian <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>
Subject: RE: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

[AMD Official Use Only - Internal Distribution Only]

On VG20 or MI100, as soon as we run the subtest, we get the dmesg output below, and then the kernel ends up hanging. I don't know enough about the test itself to know why this is occurring, but Jon Kim and Felix were discussing it on a separate thread when the issue was first reported, so they can hopefully provide some additional information.

 Kent

> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
> Sent: Tuesday, April 14, 2020 9:52 AM
> To: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in
> amdgpu_device_vram_access v2"
>
> Am 13.04.20 um 20:20 schrieb Kent Russell:
> > This reverts commit c12b84d6e0d70f1185e6daddfd12afb671791b6e.
> > The original patch causes a RAS event and subsequent kernel hard-hang
> > when running the KFDMemoryTest.PtraceAccessInvisibleVram on VG20 and
> > Arcturus
> >
> > dmesg output at hang time:
> > [drm] RAS event of type ERREVENT_ATHUB_INTERRUPT detected!
> > amdgpu 0000:67:00.0: GPU reset begin!
> > Evicting PASID 0x8000 queues
> > Started evicting pasid 0x8000
> > qcm fence wait loop timeout expired
> > The cp might be in an unrecoverable state due to an unsuccessful
> > queues preemption Failed to evict process queues Failed to suspend
> > process 0x8000 Finished evicting pasid 0x8000 Started restoring pasid
> > 0x8000 Finished restoring pasid 0x8000 [drm] UVD VCPU state may lost
> > due to RAS ERREVENT_ATHUB_INTERRUPT
> > amdgpu: [powerplay] Failed to send message 0x26, response 0x0
> > amdgpu: [powerplay] Failed to set soft min gfxclk !
> > amdgpu: [powerplay] Failed to upload DPM Bootup Levels!
> > amdgpu: [powerplay] Failed to send message 0x7, response 0x0
> > amdgpu: [powerplay] [DisableAllSMUFeatures] Failed to disable all smu
> features!
> > amdgpu: [powerplay] [DisableDpmTasks] Failed to disable all smu features!
> > amdgpu: [powerplay] [PowerOffAsic] Failed to disable DPM!
> > [drm:amdgpu_device_ip_suspend_phase2 [amdgpu]] *ERROR* suspend of IP
> > block <powerplay> failed -5
>
> Do you have more information on what's going wrong here since this is a really
> important patch for KFD debugging.
>
> >
> > Signed-off-by: Kent Russell <kent.russell@xxxxxxx>
>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ----------------------
> >   1 file changed, 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index cf5d6e585634..a3f997f84020 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -254,32 +254,6 @@ void amdgpu_device_vram_access(struct
> amdgpu_device *adev, loff_t pos,
> >      uint32_t hi = ~0;
> >      uint64_t last;
> >
> > -
> > -#ifdef CONFIG_64BIT
> > -   last = min(pos + size, adev->gmc.visible_vram_size);
> > -   if (last > pos) {
> > -           void __iomem *addr = adev->mman.aper_base_kaddr + pos;
> > -           size_t count = last - pos;
> > -
> > -           if (write) {
> > -                   memcpy_toio(addr, buf, count);
> > -                   mb();
> > -                   amdgpu_asic_flush_hdp(adev, NULL);
> > -           } else {
> > -                   amdgpu_asic_invalidate_hdp(adev, NULL);
> > -                   mb();
> > -                   memcpy_fromio(buf, addr, count);
> > -           }
> > -
> > -           if (count == size)
> > -                   return;
> > -
> > -           pos += count;
> > -           buf += count / 4;
> > -           size -= count;
> > -   }
> > -#endif
> > -
> >      spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> >      for (last = pos + size; pos < last; pos += 4) {
> >              uint32_t tmp = pos >> 31;
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[AMD Public Use]

 

If this causes an issue, any access to vram via the BAR could cause an issue.

 

Alex

From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of Russell, Kent <Kent.Russell@xxxxxxx>
Sent: Tuesday, April 14, 2020 10:19 AM
To: Koenig, Christian <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>
Cc: Kuehling, Felix <Felix.Kuehling@xxxxxxx>; Kim, Jonathan <Jonathan.Kim@xxxxxxx>
Subject: RE: [PATCH] Revert "drm/amdgpu: use the BAR if possible in amdgpu_device_vram_access v2"

 

[AMD Official Use Only - Internal Distribution Only]

On VG20 or MI100, as soon as we run the subtest, we get the dmesg output below, and then the kernel ends up hanging. I don't know enough about the test itself to know why this is occurring, but Jon Kim and Felix were discussing it on a separate thread when the issue was first reported, so they can hopefully provide some additional information.

 Kent

> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
> Sent: Tuesday, April 14, 2020 9:52 AM
> To: Russell, Kent <Kent.Russell@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] Revert "drm/amdgpu: use the BAR if possible in
> amdgpu_device_vram_access v2"
>
> Am 13.04.20 um 20:20 schrieb Kent Russell:
> > This reverts commit c12b84d6e0d70f1185e6daddfd12afb671791b6e.
> > The original patch causes a RAS event and subsequent kernel hard-hang
> > when running the KFDMemoryTest.PtraceAccessInvisibleVram on VG20 and
> > Arcturus
> >
> > dmesg output at hang time:
> > [drm] RAS event of type ERREVENT_ATHUB_INTERRUPT detected!
> > amdgpu 0000:67:00.0: GPU reset begin!
> > Evicting PASID 0x8000 queues
> > Started evicting pasid 0x8000
> > qcm fence wait loop timeout expired
> > The cp might be in an unrecoverable state due to an unsuccessful
> > queues preemption Failed to evict process queues Failed to suspend
> > process 0x8000 Finished evicting pasid 0x8000 Started restoring pasid
> > 0x8000 Finished restoring pasid 0x8000 [drm] UVD VCPU state may lost
> > due to RAS ERREVENT_ATHUB_INTERRUPT
> > amdgpu: [powerplay] Failed to send message 0x26, response 0x0
> > amdgpu: [powerplay] Failed to set soft min gfxclk !
> > amdgpu: [powerplay] Failed to upload DPM Bootup Levels!
> > amdgpu: [powerplay] Failed to send message 0x7, response 0x0
> > amdgpu: [powerplay] [DisableAllSMUFeatures] Failed to disable all smu
> features!
> > amdgpu: [powerplay] [DisableDpmTasks] Failed to disable all smu features!
> > amdgpu: [powerplay] [PowerOffAsic] Failed to disable DPM!
> > [drm:amdgpu_device_ip_suspend_phase2 [amdgpu]] *ERROR* suspend of IP
> > block <powerplay> failed -5
>
> Do you have more information on what's going wrong here since this is a really
> important patch for KFD debugging.
>
> >
> > Signed-off-by: Kent Russell <kent.russell@xxxxxxx>
>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 26 ----------------------
> >   1 file changed, 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > index cf5d6e585634..a3f997f84020 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> > @@ -254,32 +254,6 @@ void amdgpu_device_vram_access(struct
> amdgpu_device *adev, loff_t pos,
> >      uint32_t hi = ~0;
> >      uint64_t last;
> >
> > -
> > -#ifdef CONFIG_64BIT
> > -   last = min(pos + size, adev->gmc.visible_vram_size);
> > -   if (last > pos) {
> > -           void __iomem *addr = adev->mman.aper_base_kaddr + pos;
> > -           size_t count = last - pos;
> > -
> > -           if (write) {
> > -                   memcpy_toio(addr, buf, count);
> > -                   mb();
> > -                   amdgpu_asic_flush_hdp(adev, NULL);
> > -           } else {
> > -                   amdgpu_asic_invalidate_hdp(adev, NULL);
> > -                   mb();
> > -                   memcpy_fromio(buf, addr, count);
> > -           }
> > -
> > -           if (count == size)
> > -                   return;
> > -
> > -           pos += count;
> > -           buf += count / 4;
> > -           size -= count;
> > -   }
> > -#endif
> > -
> >      spin_lock_irqsave(&adev->mmio_idx_lock, flags);
> >      for (last = pos + size; pos < last; pos += 4) {
> >              uint32_t tmp = pos >> 31;
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