Am 17.05.24 um 17:46 schrieb Alex Deucher:
On Fri, May 17, 2024 at 2:35 AM Christian König
<christian.koenig@xxxxxxx> wrote:
Am 16.05.24 um 19:57 schrieb Tim Van Patten:
From: Tim Van Patten <timvp@xxxxxxxxxx>
The following commit updated gmc->noretry from 0 to 1 for GC HW IP
9.3.0:
commit 5f3854f1f4e2 ("drm/amdgpu: add more cases to noretry=1")
This causes the device to hang when a page fault occurs, until the
device is rebooted. Instead, revert back to gmc->noretry=0 so the device
is still responsive.
Wait a second. Why does the device hang on a page fault? That shouldn't
happen independent of noretry.
So that strongly sounds like this is just hiding a bug elsewhere.
Fair enough, but this is also the only gfx9 APU which defaults to
noretry=1, all of the rest are dGPUs. I'd argue it should align with
the other GFX9 APUs or they should all enable noretry=1.
Completely agree.
It's just that while the hardware should theoretically be able to handle
recoverable page faults it's just that this features is never tested on
APUs because our hw engineering assumes that they don't have to support
the use case. That's also the reason why we physically don't have the
second IH ring on APUs.
I strongly suggest that instead of doing that for each hw generations
individually to just disallow enabling retry on APUs.
Alternatively we could start testing it on hw and sw side and try to fix
all the bugs.
Regards,
Christian.
Alex
Regards,
Christian.
Fixes: 5f3854f1f4e2 ("drm/amdgpu: add more cases to noretry=1")
Signed-off-by: Tim Van Patten <timvp@xxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index be4629cdac049..bff54a20835f1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -876,7 +876,6 @@ void amdgpu_gmc_noretry_set(struct amdgpu_device *adev)
struct amdgpu_gmc *gmc = &adev->gmc;
uint32_t gc_ver = amdgpu_ip_version(adev, GC_HWIP, 0);
bool noretry_default = (gc_ver == IP_VERSION(9, 0, 1) ||
- gc_ver == IP_VERSION(9, 3, 0) ||
gc_ver == IP_VERSION(9, 4, 0) ||
gc_ver == IP_VERSION(9, 4, 1) ||
gc_ver == IP_VERSION(9, 4, 2) ||
