On Thu, 11 Mar 2021 at 10:09, Daniel Gomez daniel@qtec.com wrote:
On Wed, 10 Mar 2021 at 18:06, Alex Deucher alexdeucher@gmail.com wrote:
On Wed, Mar 10, 2021 at 11:37 AM Daniel Gomez daniel@qtec.com wrote:
Disabling GFXOFF via the quirk list fixes a hardware lockup in Ryzen V1605B, RAVEN 0x1002:0x15DD rev 0x83.
Signed-off-by: Daniel Gomez daniel@qtec.com
This patch is a continuation of the work here: https://lkml.org/lkml/2021/2/3/122 where a hardware lockup was discussed and a dma_fence deadlock was provoke as a side effect. To reproduce the issue please refer to the above link.
The hardware lockup was introduced in 5.6-rc1 for our particular revision as it wasn't part of the new blacklist. Before that, in kernel v5.5, this hardware was working fine without any hardware lock because the GFXOFF was actually disabled by the if condition for the CHIP_RAVEN case. So this patch, adds the 'Radeon Vega Mobile Series [1002:15dd] (rev 83)' to the blacklist to disable the GFXOFF.
But besides the fix, I'd like to ask from where this revision comes from. Is it an ASIC revision or is it hardcoded in the VBIOS from our vendor? From what I can see, it comes from the ASIC and I wonder if somehow we can get an APU in the future, 'not blacklisted', with the same problem. Then, should this table only filter for the vendor and device and not the revision? Do you know if there are any revisions for the 1002:15dd validated, tested and functional?
The pci revision id (RID) is used to specify the specific SKU within a family. GFXOFF is supposed to be working on all raven variants. It was tested and functional on all reference platforms and any OEM platforms that launched with Linux support. There are a lot of dependencies on sbios in the early raven variants (0x15dd), so it's likely more of a specific platform issue, but there is not a good way to detect this so we use the DID/SSID/RID as a proxy. The newer raven variants (0x15d8) have much better GFXOFF support since they all shipped with newer firmware and sbios.
We took one of the first reference platform boards to design our custom board based on the V1605B and I assume it has one of the early 'unstable' raven variants with RID 0x83. Also, as OEM we are in control of the bios (provided by insyde) but I wasn't sure about the RID so, thanks for the clarification. Is there anything we can do with the bios to have the GFXOFF enabled and 'stable' for this particular revision? Otherwise we'd need to add the 0x83 RID to the table. Also, there is an extra ']' in the patch subject. Sorry for that. Would you need a new patch in case you accept it with the ']' removed?
Good to hear that the newer raven versions have better GFXOFF support.
Adding Alex Desnoyer to the loop as he is the electronic/hardware and bios responsible so, he can provide more information about this.
I've now done a test on the reference platform (dibbler) with the latest bios available and the hw lockup can be also reproduced with the same steps.
For reference, I'm using mainline kernel 5.12-rc2.
[ 5.938544] [drm] initializing kernel modesetting (RAVEN 0x1002:0x15DD 0x1002:0x15DD 0xC1). [ 5.939942] amdgpu: ATOM BIOS: 113-RAVEN-11
As in the previous cases, the clocks go to 100% of usage when the hang occurs.
However, when the gpu hangs, dmesg output displays the following:
[ 1568.279847] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=188, emitted seq=191 [ 1568.434084] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process Xorg pid 311 thread Xorg:cs0 pid 312 [ 1568.279847] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=188, emitted seq=191 [ 1568.434084] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process Xorg pid 311 thread Xorg:cs0 pid 312 [ 1568.507000] amdgpu 0000:01:00.0: amdgpu: GPU reset begin! [ 1628.491882] rcu: INFO: rcu_sched self-detected stall on CPU [ 1628.491882] rcu: 3-...!: (665 ticks this GP) idle=f9a/1/0x4000000000000000 softirq=188533/188533 fqs=15 [ 1628.491882] rcu: rcu_sched kthread timer wakeup didn't happen for 58497 jiffies! g726761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 [ 1628.491882] rcu: Possible timer handling issue on cpu=2 timer-softirq=55225 [ 1628.491882] rcu: rcu_sched kthread starved for 58500 jiffies! g726761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=2 [ 1628.491882] rcu: Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior. [ 1628.491882] rcu: RCU grace-period kthread stack dump: [ 1628.491882] rcu: Stack dump where RCU GP kthread last ran: [ 1808.518445] rcu: INFO: rcu_sched self-detected stall on CPU [ 1808.518445] rcu: 3-...!: (2643 ticks this GP) idle=f9a/1/0x4000000000000000 softirq=188533/188533 fqs=15 [ 1808.518445] rcu: rcu_sched kthread starved for 238526 jiffies! g726761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=2 [ 1808.518445] rcu: Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior. [ 1808.518445] rcu: RCU grace-period kthread stack dump: [ 1808.518445] rcu: Stack dump where RCU GP kthread last ran:
Daniel
Alex
Logs: [ 27.708348] [drm] initializing kernel modesetting (RAVEN 0x1002:0x15DD 0x1002:0x15DD 0x83). [ 27.789156] amdgpu: ATOM BIOS: 113-RAVEN-115
Thanks in advance, Daniel
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c index 65db88bb6cbc..319d4b99aec8 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c @@ -1243,6 +1243,8 @@ static const struct amdgpu_gfxoff_quirk amdgpu_gfxoff_quirk_list[] = { { 0x1002, 0x15dd, 0x103c, 0x83e7, 0xd3 }, /* GFXOFF is unstable on C6 parts with a VBIOS 113-RAVEN-114 */ { 0x1002, 0x15dd, 0x1002, 0x15dd, 0xc6 },
/* GFXOFF provokes a hw lockup on 83 parts with a VBIOS 113-RAVEN-115 */{ 0x1002, 0x15dd, 0x1002, 0x15dd, 0x83 }, { 0, 0, 0, 0, 0 },};
-- 2.30.1
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