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From: Alex Sierra <alex.sierra@amd.com>
To: amd-gfx@lists.freedesktop.org
Cc: Alex Sierra <alex.sierra@amd.com>
Subject: [PATCH] drm/amdgpu: extend xnack limit page fault timeout
Date: Mon, 19 Apr 2021 12:22:11 -0500	[thread overview]
Message-ID: <20210419172211.17096-1-alex.sierra@amd.com> (raw)

Extending this timeout will prevent IH from storm interrupts coming
from SDMA while a page fault is active. Currently, on Aldebaran,
handling that many interrupts can take a lot of CPU time
(up to 4 seconds).
This eventually causes timeouts in other tasks.

Signed-off-by: Alex Sierra <alex.sierra@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
index 5715be6770ec..823a367990bf 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -1109,6 +1109,8 @@ static void sdma_v4_0_ctx_switch_enable(struct amdgpu_device *adev, bool enable)
 		if (adev->asic_type == CHIP_ARCTURUS &&
 		    adev->sdma.instance[i].fw_version >= 14)
 			WREG32_SDMA(i, mmSDMA0_PUB_DUMMY_REG2, enable);
+		/* Extend page fault timeout to avoid interrupt storm */
+		WREG32_SDMA(i, mmSDMA0_UTCL1_TIMEOUT, 0x00800080);
 	}
 
 }
-- 
2.17.1

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             reply	other threads:[~2021-04-19 17:22 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 17:22 Alex Sierra [this message]
2021-04-19 18:53 ` [PATCH] drm/amdgpu: extend xnack limit page fault timeout Felix Kuehling

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