| Message ID | 20220211193250.1904843-3-mario.limonciello@amd.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | Overhaul `is_thunderbolt` | expand |
Update subject to something like: PCI: pciehp: Quirk broken Command Completed support on Intel Thunderbolt controllers On Fri, Feb 11, 2022 at 01:32:40PM -0600, Mario Limonciello wrote: > 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); Please add a comment above to the effect that PCI_EXP_SLTCAP_NCCS being clear means the controller generates a Command Completed software notification when it completes a command, and these controllers don't generate those notifications even though PCI_EXP_SLTCAP_NCCS is clear (PCIe r6.0, sec 7.5.3.9). > +static void quirk_thunderbolt_command_completed(struct pci_dev *pdev) Rename to quirk_no_command_completed(). This doesn't have anything to do with Thunderbolt; it's just that the affected devices happen to be Thunderbolt controllers. > +{ > + 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); Can we put these in drivers/pci/hotplug/pciehp_hpc.c? We already have a few similar quirks there. > #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 >
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
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(-)