From 92a3499933c17b25b7c59658183bc7d23a581f5b Mon Sep 17 00:00:00 2001 From: Michael Kelley Date: Thu, 24 Mar 2022 09:14:52 -0700 Subject: [PATCH] PCI: hv: Propagate coherence from VMbus device to PCI device [ Upstream commit 8d21732475c637c7efcdb91dc927a4c594e97898 ] PCI pass-thru devices in a Hyper-V VM are represented as a VMBus device and as a PCI device. The coherence of the VMbus device is set based on the VMbus node in ACPI, but the PCI device has no ACPI node and defaults to not hardware coherent. This results in extra software coherence management overhead on ARM64 when devices are hardware coherent. Fix this by setting up the PCI host bus so that normal PCI mechanisms will propagate the coherence of the VMbus device to the PCI device. There's no effect on x86/x64 where devices are always hardware coherent. Signed-off-by: Michael Kelley Acked-by: Boqun Feng Acked-by: Robin Murphy Link: https://lore.kernel.org/r/1648138492-2191-3-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu Signed-off-by: Sasha Levin --- drivers/pci/controller/pci-hyperv.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 9dd4502d32a41..5b156c563e3a4 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -3148,6 +3148,15 @@ static int hv_pci_probe(struct hv_device *hdev, hbus->bridge->domain_nr = dom; #ifdef CONFIG_X86 hbus->sysdata.domain = dom; +#elif defined(CONFIG_ARM64) + /* + * Set the PCI bus parent to be the corresponding VMbus + * device. Then the VMbus device will be assigned as the + * ACPI companion in pcibios_root_bridge_prepare() and + * pci_dma_configure() will propagate device coherence + * information to devices created on the bus. + */ + hbus->sysdata.parent = hdev->device.parent; #endif hbus->hdev = hdev; -- 2.30.2