linux-kernel - [PATCH AUTOSEL 6.12 21/31] drm/amdgpu: Don't enable sdma 4.4.5 CTXEMPTY interrupt

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Message-Id: <20250126145448.930220-21-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:54:37 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Philip Yang <Philip.Yang@....com>,
	Felix Kuehling <felix.kuehling@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	simona@...ll.ch,
	sunil.khatri@....com,
	Hawking.Zhang@....com,
	kevinyang.wang@....com,
	lijo.lazar@....com,
	boyuan.zhang@....com,
	jesse.zhang@....com,
	Jiadong.Zhu@....com,
	tao.zhou1@....com,
	le.ma@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.12 21/31] drm/amdgpu: Don't enable sdma 4.4.5 CTXEMPTY interrupt

From: Philip Yang <Philip.Yang@....com>

[ Upstream commit b4b7271e5ca95b581f2fcc4ae852c4079215e92d ]

The sdma context empty interrupt is dropped in amdgpu_irq_dispatch
as unregistered interrupt src_id 243, this interrupt accounts to 1/3 of
total interrupts and causes IH primary ring overflow when running
stressful benchmark application. Disable this interrupt has no side
effect found.

Signed-off-by: Philip Yang <Philip.Yang@....com>
Reviewed-by: Felix Kuehling <felix.kuehling@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
index c77889040760a..4dd86c682ee6a 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c
@@ -953,10 +953,12 @@ static int sdma_v4_4_2_inst_start(struct amdgpu_device *adev,
 		/* set utc l1 enable flag always to 1 */
 		temp = RREG32_SDMA(i, regSDMA_CNTL);
 		temp = REG_SET_FIELD(temp, SDMA_CNTL, UTC_L1_ENABLE, 1);
-		/* enable context empty interrupt during initialization */
-		temp = REG_SET_FIELD(temp, SDMA_CNTL, CTXEMPTY_INT_ENABLE, 1);
-		WREG32_SDMA(i, regSDMA_CNTL, temp);
 
+		if (amdgpu_ip_version(adev, SDMA0_HWIP, 0) < IP_VERSION(4, 4, 5)) {
+			/* enable context empty interrupt during initialization */
+			temp = REG_SET_FIELD(temp, SDMA_CNTL, CTXEMPTY_INT_ENABLE, 1);
+			WREG32_SDMA(i, regSDMA_CNTL, temp);
+		}
 		if (!amdgpu_sriov_vf(adev)) {
 			if (adev->firmware.load_type != AMDGPU_FW_LOAD_PSP) {
 				/* unhalt engine */
-- 
2.39.5