On 27/09/2023 19:27, Felix Kuehling wrote:
[+Mukul]
On 2023-09-27 12:16, Arvind Yadav wrote:
This patch is to adjust the absolute doorbell offset
against the doorbell id considering the doorbell
size of 32/64 bit.
Cc: Christian Koenig<christian.koe...@amd.com>
Cc: Alex Deucher<alexander.deuc...@amd.com>
Signed-off-by: Shashank Sharma<shashank.sha...@amd.com>
Signed-off-by: Arvind Yadav<arvind.ya...@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index 0d3d538b64eb..c327f7f604d7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -407,7 +407,16 @@ static int allocate_doorbell(struct qcm_process_device
*qpd,
q->properties.doorbell_off = amdgpu_doorbell_index_on_bar(dev->adev,
qpd->proc_doorbells,
-
q->doorbell_id);
+ 0);
Looks like we're now always calling amdgpu_doorbell_index_on_bar with
the third parameter = 0. So we could remove that parameter. It doesn't
do us any good and only causes bugs if we use any non-0 value.
Hey Felix,
Actually this was happening because in usermode KFD library the
doorbell-size is for non-SOC15() hardware is hard coded to 4 bytes.
We added this fix just so that the library code doesn't need to be
changed, but can still get aligned to kernel code.
GFX Usermode queue code uses this doorbell-index parameter, and it gives
us the right offset.
Regards
Shashank
+
+ /* Adjust the absolute doorbell offset against the doorbell id
considering
+ * the doorbell size of 32/64 bit.
+ */
+ if (!KFD_IS_SOC15(dev))
+ q->properties.doorbell_off += q->doorbell_id;
+ else
+ q->properties.doorbell_off += q->doorbell_id * 2;
This could be simplified and generalized as
q->properties.doorbell_off += q->doorbell_id *
dev->kfd->device_info.doorbell_size / 4;
Agree, we can do this simplification.
- Shashank
Regards,
Felix
+
return 0;
}
