[PATCH v2 2/9] PCI: Move `is_thunderbolt` check for lack of command completed to a quirk

Mario Limonciello
2022-02-10T22:43:56Z

The `is_thunderbolt` check is currently used to indicate the lack of
command completed support for a number of older Thunderbolt devices.

This however is heavy handed and should have been done via a quirk. Move
the affected devices outlined in commit 493fb50e958c ("PCI: pciehp: Assume
NoCompl+ for Thunderbolt ports") into pci quirks.

Suggested-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
drivers/pci/hotplug/pciehp_hpc.c | 6 +-----
drivers/pci/quirks.c | 17 +++++++++++++++++
include/linux/pci.h | 2 ++
3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 1c1ebf3dad43..e4c42b24aba8 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -996,11 +996,7 @@ struct controller *pcie_init(struct pcie_device *dev)
if (pdev->hotplug_user_indicators)
slot_cap &= ~(PCI_EXP_SLTCAP_AIP | PCI_EXP_SLTCAP_PIP);

- /*
- * We assume no Thunderbolt controllers support Command Complete events,
- * but some controllers falsely claim they do.
- */
- if (pdev->is_thunderbolt)
+ if (pdev->no_cmd_complete)
slot_cap |= PCI_EXP_SLTCAP_NCCS;

ctrl->slot_cap = slot_cap;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index d2dd6a6cda60..6d3c88edde00 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3675,6 +3675,23 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PORT_RIDGE,
quirk_thunderbolt_hotplug_msi);

+static void quirk_thunderbolt_command_completed(struct pci_dev *pdev)
+{
+ pdev->no_cmd_complete = 1;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LIGHT_RIDGE,
+ quirk_thunderbolt_command_completed);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EAGLE_RIDGE,
+ quirk_thunderbolt_command_completed);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LIGHT_PEAK,
+ quirk_thunderbolt_command_completed);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C,
+ quirk_thunderbolt_command_completed);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C,
+ quirk_thunderbolt_command_completed);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PORT_RIDGE,
+ quirk_thunderbolt_command_completed);
+
#ifdef CONFIG_ACPI
/*
* Apple: Shutdown Cactus Ridge Thunderbolt controller.
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8253a5413d7c..1e5b769e42fc 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -443,6 +443,8 @@ struct pci_dev {
unsigned int is_hotplug_bridge:1;
unsigned int shpc_managed:1; /* SHPC owned by shpchp */
unsigned int is_thunderbolt:1; /* Thunderbolt controller */
+ unsigned int no_cmd_complete:1; /* Lies about command completed events */
+
/*
* Devices marked being untrusted are the ones that can potentially
* execute DMA attacks and similar. They are typically connected
--
2.34.1