This is a note to let you know that I've just added the patch titled PCI: Add ACS quirk for Zhaoxin multi-function devices to the 5.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pci-add-acs-quirk-for-zhaoxin-multi-function-devices.patch and it can be found in the queue-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 0325837c51cb7c9a5bd3e354ac0c0cda0667d50e Mon Sep 17 00:00:00 2001 From: Raymond Pang <RaymondPang-oc@xxxxxxxxxxx> Date: Fri, 27 Mar 2020 17:11:47 +0800 Subject: PCI: Add ACS quirk for Zhaoxin multi-function devices From: Raymond Pang <RaymondPang-oc@xxxxxxxxxxx> commit 0325837c51cb7c9a5bd3e354ac0c0cda0667d50e upstream. Some Zhaoxin endpoints are implemented as multi-function devices without an ACS capability, but they actually don't support peer-to-peer transactions. Add ACS quirks to declare DMA isolation. Link: https://lore.kernel.org/r/20200327091148.5190-3-RaymondPang-oc@xxxxxxxxxxx Signed-off-by: Raymond Pang <RaymondPang-oc@xxxxxxxxxxx> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/pci/quirks.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4767,6 +4767,10 @@ static const struct pci_dev_acs_enabled { PCI_VENDOR_ID_BROADCOM, 0xD714, pci_quirk_brcm_acs }, /* Amazon Annapurna Labs */ { PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs }, + /* Zhaoxin multi-function devices */ + { PCI_VENDOR_ID_ZHAOXIN, 0x3038, pci_quirk_mf_endpoint_acs }, + { PCI_VENDOR_ID_ZHAOXIN, 0x3104, pci_quirk_mf_endpoint_acs }, + { PCI_VENDOR_ID_ZHAOXIN, 0x9083, pci_quirk_mf_endpoint_acs }, { 0 } }; Patches currently in stable-queue which might be from RaymondPang-oc@xxxxxxxxxxx are queue-5.6/pci-add-acs-quirk-for-zhaoxin-multi-function-devices.patch queue-5.6/pci-add-acs-quirk-for-zhaoxin-root-downstream-ports.patch