From 9be26ddf88de5621f071a1e4f7725ce1015b5036 Mon Sep 17 00:00:00 2001
From: "Emily.Deng" <Emily.Deng@amd.com>
Date: Thu, 1 Oct 2020 12:41:50 +0800
Subject: drm/amdgpu: Restore msix after FLR
After FLR, the msix will be cleared, so need to re-enable it.
Signed-off-by: Peng Ju Zhou <PengJu.Zhou@amd.com>
Signed-off-by: Emily.Deng <Emily.Deng@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
(limited to 'drivers/gpu/drm/amd')
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 32ce0e679dc7..83af307e97cd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -278,6 +278,21 @@ static bool amdgpu_msi_ok(struct amdgpu_device *adev)
return true;
}
+static void amdgpu_restore_msix(struct amdgpu_device *adev)
+{
+ u16 ctrl;
+
+ pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
+ if (!(ctrl & PCI_MSIX_FLAGS_ENABLE))
+ return;
+
+ /* VF FLR */
+ ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
+ pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
+ ctrl |= PCI_MSIX_FLAGS_ENABLE;
+ pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
+}
+
/**
* amdgpu_irq_init - initialize interrupt handling
*
@@ -569,6 +584,9 @@ void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
{
int i, j, k;
+ if (amdgpu_sriov_vf(adev))
+ amdgpu_restore_msix(adev);
+
for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
if (!adev->irq.client[i].sources)
continue;
--
cgit v1.2.3-70-g09d2