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Subject[PATCH 4.14 034/193] PCI: Apply Cavium ThunderX ACS quirk to more Root Ports
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vadim Lomovtsev <Vadim.Lomovtsev@cavium.com>

commit f2ddaf8dfd4a5071ad09074d2f95ab85d35c8a1e upstream.

Extend the Cavium ThunderX ACS quirk to cover more device IDs and restrict
it to only Root Ports.

Signed-off-by: Vadim Lomovtsev <Vadim.Lomovtsev@cavium.com>
[bhelgaas: changelog, stable tag]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/pci/quirks.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4212,6 +4212,19 @@ static int pci_quirk_amd_sb_acs(struct p
#endif
}

+static bool pci_quirk_cavium_acs_match(struct pci_dev *dev)
+{
+ /*
+ * Effectively selects all downstream ports for whole ThunderX 1
+ * family by 0xf800 mask (which represents 8 SoCs), while the lower
+ * bits of device ID are used to indicate which subdevice is used
+ * within the SoC.
+ */
+ return (pci_is_pcie(dev) &&
+ (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) &&
+ ((dev->device & 0xf800) == 0xa000));
+}
+
static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
{
/*
@@ -4224,7 +4237,7 @@ static int pci_quirk_cavium_acs(struct p
*/
acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF);

- if (!((dev->device >= 0xa000) && (dev->device <= 0xa0ff)))
+ if (!pci_quirk_cavium_acs_match(dev))
return -ENOTTY;

return acs_flags ? 0 : 1;

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