[PATCH 3/6] drm/amdgpu: Restore msix after FLR
Lazar, Lijo
Lijo.Lazar at amd.com
Mon Mar 29 08:14:38 UTC 2021
[AMD Public Use]
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Emily Deng
Sent: Monday, March 29, 2021 1:20 PM
To: amd-gfx at lists.freedesktop.org
Cc: Deng, Emily <Emily.Deng at amd.com>
Subject: [PATCH 3/6] drm/amdgpu: Restore msix after FLR
From: "Emily.Deng" <Emily.Deng at amd.com>
After FLR, the msix will be cleared, so need to re-enable it.
Signed-off-by: Emily.Deng <Emily.Deng at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 03412543427a..f24263120f3a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -277,6 +277,18 @@ static bool amdgpu_msi_ok(struct amdgpu_device *adev)
return true;
}
+void amdgpu_restore_msix(struct amdgpu_device *adev) { #ifdef
+PCI_IRQ_MSIX
+ u16 ctrl;
+
+ pci_read_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);
+ ctrl |= PCI_MSIX_FLAGS_ENABLE;
+ pci_write_config_word(adev->pdev, adev->pdev->msix_cap +
+PCI_MSIX_FLAGS, ctrl); #endif }
< > pci_restore_msi_state() is the API to do this.
/**
* amdgpu_irq_init - initialize interrupt handling
*
@@ -558,6 +570,7 @@ void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev) {
int i, j, k;
+ amdgpu_restore_msix(adev);
< > This is not needed for all cases. For ex: this is called in other cases like mode1 reset where entire config space (including MSIX) is restored already.
Thanks,
Lijo
for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
if (!adev->irq.client[i].sources)
continue;
--
2.25.1
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