Re: [PATCH] gpu/drm: Replace "%p" with "%pK"

From: Christian KÃnig
Date: Tue Jun 30 2020 - 09:02:08 EST


Am 30.06.20 um 14:14 schrieb Tiezhu Yang:
On 06/30/2020 04:05 PM, Christian KÃnig wrote:
Am 30.06.20 um 09:36 schrieb Tiezhu Yang:
When I update the latest kernel, I see the following "____ptrval____" boot
messages. Use "%pK" instead of "%p" so that the cpu address can be printed
when the kptr_restrict sysctl is set to 1.

Both radeon_fence_driver_start_ring() and amdgpu_fence_driver_start_ring()
have this similar issue, fix them.

[ÂÂÂ 1.872600] radeon 0000:01:05.0: fence driver on ring 0 use gpu addr 0x0000000048000c00 and cpu addr 0x(____ptrval____)
[ÂÂÂ 1.879095] radeon 0000:01:05.0: fence driver on ring 5 use gpu addr 0x0000000040056038 and cpu addr 0x(____ptrval____)

We can probably just completely drop the CPU address here.

OK, maybe the CPU address is not much useful. If nobody has any objections,
I will send v2 to remove the debug info about CPU address.

The CPU address was useful in the past, but isn't any more. We now have a debugfs file to read the current fence values.

Please go ahead and send a patch to just remove printing them.

Thanks,
Christian.


Thanks,
Tiezhu


Christian.


Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 5 ++---
 drivers/gpu/drm/radeon/radeon_fence.c | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index d878fe7..d4d1e8c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -422,9 +422,8 @@ int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
ÂÂÂÂÂ ring->fence_drv.irq_type = irq_type;
ÂÂÂÂÂ ring->fence_drv.initialized = true;
 - DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr "
-ÂÂÂÂÂÂÂÂÂÂÂÂÂ "0x%016llx, cpu addr 0x%p\n", ring->name,
-ÂÂÂÂÂÂÂÂÂÂÂÂÂ ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr);
+ÂÂÂ DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx, cpu addr 0x%pK\n",
+ÂÂÂÂÂÂÂÂÂÂÂÂÂ ring->name, ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr);
ÂÂÂÂÂ return 0;
 }
 diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index 43f2f93..c51b094 100644
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -865,7 +865,7 @@ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)
ÂÂÂÂÂ }
ÂÂÂÂÂ radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring);
ÂÂÂÂÂ rdev->fence_drv[ring].initialized = true;
-ÂÂÂ dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n",
+ÂÂÂ dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%pK\n",
ÂÂÂÂÂÂÂÂÂÂ ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr);
ÂÂÂÂÂ return 0;
 }