From 3d0e3ce52ce3eb4b9de3caf9c38dbb5a4d3e13c3 Mon Sep 17 00:00:00 2001
From: Sam Bobroff <sbobroff@linux.ibm.com>
Date: Mon, 18 Nov 2019 10:53:54 +1100
Subject: drm/amdgpu: fix bad DMA from INTERRUPT_CNTL2
Git-commit: 3d0e3ce52ce3eb4b9de3caf9c38dbb5a4d3e13c3
Patch-mainline: v5.5-rc1
References: bsc#1152472
The INTERRUPT_CNTL2 register expects a valid DMA address, but is
currently set with a GPU MC address. This can cause problems on
systems that detect the resulting DMA read from an invalid address
(found on a Power8 guest).
Instead, use the DMA address of the dummy page because it will always
be safe.
Fixes: 27ae10641e9c ("drm/amdgpu: add interupt handler implementation for si v3")
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/amd/amdgpu/si_ih.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/si_ih.c b/drivers/gpu/drm/amd/amdgpu/si_ih.c
index 57bb5f9e08b2..88ae27a5a03d 100644
--- a/drivers/gpu/drm/amd/amdgpu/si_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/si_ih.c
@@ -64,7 +64,8 @@ static int si_ih_irq_init(struct amdgpu_device *adev)
u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
si_ih_disable_interrupts(adev);
- WREG32(INTERRUPT_CNTL2, adev->irq.ih.gpu_addr >> 8);
+ /* set dummy read address to dummy page address */
+ WREG32(INTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
interrupt_cntl = RREG32(INTERRUPT_CNTL);
interrupt_cntl &= ~IH_DUMMY_RD_OVERRIDE;
interrupt_cntl &= ~IH_REQ_NONSNOOP_EN;
--
2.28.0