* [PATCH] drm/amdgpu: check CG flag before querying CG status
@ 2021-08-02 9:30 Lang Yu
2021-08-02 16:32 ` Alex Deucher
0 siblings, 1 reply; 2+ messages in thread
From: Lang Yu @ 2021-08-02 9:30 UTC (permalink / raw)
To: amd-gfx; +Cc: Huang Rui, Alex Deucher, Lang Yu
For ASICs which don't supoort clock gating, querying CG status
may cause a hardware hang issue. So add a CG flag check to exit
directly in such a case.
Signed-off-by: Lang Yu <lang.yu@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index b1d2dc39e8be..a7afcdc50ca8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1671,6 +1671,11 @@ void amdgpu_device_ip_get_clockgating_state(struct amdgpu_device *adev,
{
int i;
+ if (!adev->cg_flags) {
+ *flags = 0;
+ return;
+ }
+
for (i = 0; i < adev->num_ip_blocks; i++) {
if (!adev->ip_blocks[i].status.valid)
continue;
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] drm/amdgpu: check CG flag before querying CG status
2021-08-02 9:30 [PATCH] drm/amdgpu: check CG flag before querying CG status Lang Yu
@ 2021-08-02 16:32 ` Alex Deucher
0 siblings, 0 replies; 2+ messages in thread
From: Alex Deucher @ 2021-08-02 16:32 UTC (permalink / raw)
To: Lang Yu; +Cc: amd-gfx list, Huang Rui, Alex Deucher
On Mon, Aug 2, 2021 at 5:31 AM Lang Yu <lang.yu@amd.com> wrote:
>
> For ASICs which don't supoort clock gating, querying CG status
> may cause a hardware hang issue. So add a CG flag check to exit
> directly in such a case.
>
> Signed-off-by: Lang Yu <lang.yu@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index b1d2dc39e8be..a7afcdc50ca8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -1671,6 +1671,11 @@ void amdgpu_device_ip_get_clockgating_state(struct amdgpu_device *adev,
> {
> int i;
>
> + if (!adev->cg_flags) {
> + *flags = 0;
> + return;
> + }
This is fine if someone has disabled all CG flags, but maybe it would
be better to check each flag individually within the
get_clockgating_state() callback for each IP. Do we need a similar
check for PG flags?
Alex
> +
> for (i = 0; i < adev->num_ip_blocks; i++) {
> if (!adev->ip_blocks[i].status.valid)
> continue;
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-08-02 9:30 [PATCH] drm/amdgpu: check CG flag before querying CG status Lang Yu
2021-08-02 16:32 ` Alex Deucher
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