This is a note to let you know that I've just added the patch titled

drm/nouveau/pci: do a msi rearm on init

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-nouveau-pci-do-a-msi-rearm-on-init.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Feb 28 16:23:28 CET 2018

From: Karol Herbst kherbst@redhat.com Date: Fri, 24 Nov 2017 03:56:26 +0100 Subject: drm/nouveau/pci: do a msi rearm on init

From: Karol Herbst kherbst@redhat.com

[ Upstream commit a121027d2747168df0aac0c3da35509eea39f61c ]

On my GP107 when I load nouveau after unloading it, for some reason the GPU stopped sending or the CPU stopped receiving interrupts if MSI was enabled.

Doing a rearm once before getting any interrupts fixes this.

Signed-off-by: Karol Herbst kherbst@redhat.com Reviewed-by: Thierry Reding treding@nvidia.com Signed-off-by: Ben Skeggs bskeggs@redhat.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c | 7 +++++++ 1 file changed, 7 insertions(+)

--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c @@ -136,6 +136,13 @@ nvkm_pci_init(struct nvkm_subdev *subdev return ret;

pci->irq = pdev->irq; + + /* Ensure MSI interrupts are armed, for the case where there are + * already interrupts pending (for whatever reason) at load time. + */ + if (pci->msi) + pci->func->msi_rearm(pci); + return ret; }

Patches currently in stable-queue which might be from kherbst@redhat.com are

queue-4.14/drm-nouveau-pci-do-a-msi-rearm-on-init.patch