[PATCH v5 4/4] drm/amdgpu: fix fence fallback timer expired error

[Samuel Zhang]

IH is not working after switching a new gpu index for the first time.

The msix table in virtual machine is faked. The real msix table will be
programmed by QEMU when guest enable/disable msix interrupt. But QEMU
accessing VF msix table (register GFXMSIX_VECT0_ADDR_LO) is blocked
by nBIF protection if the VF isn't in exclusive access at that time.

call amdgpu_restore_msix on resume to restore msix table.

Signed-off-by: Samuel Zhang <guoqing.zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h | 1 +
 drivers/gpu/drm/amd/amdgpu/vega20_ih.c  | 4 ++++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 0e890f2785b1..f080354efec8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -245,7 +245,7 @@ static bool amdgpu_msi_ok(struct amdgpu_device *adev)
 	return true;
 }
 
-static void amdgpu_restore_msix(struct amdgpu_device *adev)
+void amdgpu_restore_msix(struct amdgpu_device *adev)
 {
 	u16 ctrl;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
index aef5c216b191..f52bd7e6d988 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.h
@@ -149,5 +149,6 @@ void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev);
 int amdgpu_irq_add_domain(struct amdgpu_device *adev);
 void amdgpu_irq_remove_domain(struct amdgpu_device *adev);
 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id);
+void amdgpu_restore_msix(struct amdgpu_device *adev);
 
 #endif
diff --git a/drivers/gpu/drm/amd/amdgpu/vega20_ih.c b/drivers/gpu/drm/amd/amdgpu/vega20_ih.c
index faa0dd75dd6d..53c253102449 100644
--- a/drivers/gpu/drm/amd/amdgpu/vega20_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/vega20_ih.c
@@ -648,6 +648,10 @@ static int vega20_ih_suspend(struct amdgpu_ip_block *ip_block)
 
 static int vega20_ih_resume(struct amdgpu_ip_block *ip_block)
 {
+	struct amdgpu_device *adev = ip_block->adev;
+
+	if (amdgpu_sriov_vf(adev))
+		amdgpu_restore_msix(adev);
 	return vega20_ih_hw_init(ip_block);
 }
 
-- 
2.43.5