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

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[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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