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From 9a719637a116b7040b6dc0c1889c558fa2a78a39 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Tue, 5 Mar 2019 15:13:52 +0100
Subject: [PATCH 1616/2940] drm/amdgpu: limit the number of IVs processed at
once
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c | 3 ++-
drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
index 1c50be3ab8a9..934dfdcb4e73 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
@@ -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 @@ int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *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;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h
index 113a1ba13d4a..4e0bb645176d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h
@@ -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;
--
2.17.1
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