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From: Monk Liu <>
To: <>
Cc: Monk Liu <>
Subject: [PATCH 1/2] drm/amdgpu: fix reload KMD hang on KIQ
Date: Fri, 31 Jul 2020 15:51:07 +0800
Message-ID: <> (raw)

KIQ will hang if we try below steps:
modprobe amdgpu
rmmod amdgpu
modprobe amdgpu sched_hw_submission=4

the cause is that due to KIQ is always living there even
after we unload KMD thus when doing the realod of KMD
KIQ will crash upon its register programed with different
values with the previous configuration (the config
like HQD addr, ring size, is easily changed if we alter
the sched_hw_submission)

the fix is we must inactive KIQ first before touching any
of its registgers

Signed-off-by: Monk Liu <>
 drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
index db9f1e8..f571e25 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -6433,6 +6433,9 @@ static int gfx_v10_0_kiq_init_register(struct amdgpu_ring *ring)
 	struct v10_compute_mqd *mqd = ring->mqd_ptr;
 	int j;
+	/* activate the queue */
+	WREG32_SOC15(GC, 0, mmCP_HQD_ACTIVE, 0);
 	/* disable wptr polling */

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Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31  7:51 Monk Liu [this message]
2020-07-31  7:51 ` [PATCH 2/2] drm/amdgpu: introduce a new parameter to configure how many KCQ we want(v5) Monk Liu
2020-07-31 13:53   ` Felix Kuehling
2020-07-31 13:57 ` [PATCH 1/2] drm/amdgpu: fix reload KMD hang on KIQ Felix Kuehling
2020-08-03  1:54   ` Liu, Monk
2020-08-04  6:31     ` Liu, Monk
2020-08-04  8:01       ` Deng, Emily

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