This is a note to let you know that I've just added the patch titled
PCI: Add ACS quirk for Wangxun NICs
to the 5.15-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-wangxun-nics.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit be1bb52c893b4106719ddf796ed3fb2f9704d999
Author: Mengyuan Lou <mengyuanlou@xxxxxxxxxxxxx>
Date: Tue Feb 7 18:24:19 2023 +0800
PCI: Add ACS quirk for Wangxun NICs
[ Upstream commit a2b9b123ccac913e9f9b80337d687a2fe786a634 ]
Wangxun has verified there is no peer-to-peer between functions for the
below selection of SFxxx, RP1000 and RP2000 NICS. They may be
multi-function devices, but the hardware does not advertise ACS capability.
Add an ACS quirk for these devices so the functions can be in independent
IOMMU groups.
Link: https://lore.kernel.org/r/20230207102419.44326-1-mengyuanlou@xxxxxxxxxxxxx
Signed-off-by: Mengyuan Lou <mengyuanlou@xxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 305ff5bd1a20c..643a3b292f0b6 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4823,6 +4823,26 @@ static int pci_quirk_brcm_acs(struct pci_dev *dev, u16 acs_flags)
PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
}
+/*
+ * Wangxun 10G/1G NICs have no ACS capability, and on multi-function
+ * devices, peer-to-peer transactions are not be used between the functions.
+ * So add an ACS quirk for below devices to isolate functions.
+ * SFxxx 1G NICs(em).
+ * RP1000/RP2000 10G NICs(sp).
+ */
+static int pci_quirk_wangxun_nic_acs(struct pci_dev *dev, u16 acs_flags)
+{
+ switch (dev->device) {
+ case 0x0100 ... 0x010F:
+ case 0x1001:
+ case 0x2001:
+ return pci_acs_ctrl_enabled(acs_flags,
+ PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
+ }
+
+ return false;
+}
+
static const struct pci_dev_acs_enabled {
u16 vendor;
u16 device;
@@ -4968,6 +4988,8 @@ static const struct pci_dev_acs_enabled {
{ PCI_VENDOR_ID_NXP, 0x8d9b, pci_quirk_nxp_rp_acs },
/* Zhaoxin Root/Downstream Ports */
{ PCI_VENDOR_ID_ZHAOXIN, PCI_ANY_ID, pci_quirk_zhaoxin_pcie_ports_acs },
+ /* Wangxun nics */
+ { PCI_VENDOR_ID_WANGXUN, PCI_ANY_ID, pci_quirk_wangxun_nic_acs },
{ 0 }
};
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 04f44a4694a2e..4853538bf1561 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -3012,6 +3012,8 @@
#define PCI_DEVICE_ID_INTEL_VMD_9A0B 0x9a0b
#define PCI_DEVICE_ID_INTEL_S21152BB 0xb152
+#define PCI_VENDOR_ID_WANGXUN 0x8088
+
#define PCI_VENDOR_ID_SCALEMP 0x8686
#define PCI_DEVICE_ID_SCALEMP_VSMP_CTL 0x1010
