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drm/amdgpu: limit the number of IVs processed at once 

Only process a maximum of 32 IVs before writing back the RPTR. This improves
hw handling when we get close to an overflow in the ring buffer.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2019-03-05 15:13:52 +01:00 committed by Alex Deucher
parent b51cd19e48
commit 8c65fe5fc8
2 changed files with 5 additions and 1 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
View File

@ -142,6 +142,7 @@ void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
*/
int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
{
unsigned int count = AMDGPU_IH_MAX_NUM_IVS;
u32 wptr;
if (!ih->enabled || adev->shutdown)
@ -159,7 +160,7 @@ restart_ih:
/* Order reading of wptr vs. reading of IH ring data */
rmb();
while (ih->rptr != wptr) {
while (ih->rptr != wptr && --count) {
amdgpu_irq_dispatch(adev, ih);
ih->rptr &= ih->ptr_mask;
}

3
drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h
View File

@ -24,6 +24,9 @@
#ifndef __AMDGPU_IH_H__
#define __AMDGPU_IH_H__
/* Maximum number of IVs processed at once */
#define AMDGPU_IH_MAX_NUM_IVS 32
struct amdgpu_device;
struct amdgpu_iv_entry;