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07c455ee22
For this cycle we have quite an update for the Dell SMBIOS driver including WMI work to provide an interface for SMBIOS tokens via sysfs and WMI support for 2017+ Dell laptop models. SMM dispatcher code is split into a separate driver followed by a new WMI dispatcher. The latter provides a character device interface to user space. The pull request contains a merge of immutable branch from Wolfram Sang in order to apply a dependent fix to the Intel CherryTrail Battery Management driver. Other Intel drivers got a lot of cleanups. The Turbo Boost Max 3.0 support is added for Intel Skylake. Peaq WMI hotkeys driver gets its own maintainer and white list of supported models. Silead DMI is expanded to support few additional platforms. Tablet mode via GMMS ACPI method is added to support some ThinkPad tablets. Two commits appear here which were previously merged during the v4.14-rcX cycle: -d7ca5ebf24platform/x86: intel_pmc_ipc: Use devm_* calls in driver probe function -e3075fd6f8platform/x86: intel_pmc_ipc: Use spin_lock to protect GCR updates Add driver to force WMI Thunderbolt controller power status: - Add driver to force WMI Thunderbolt controller power status asus-wmi: - Add lightbar led support dell-laptop: - Allocate buffer before rfkill use dell-smbios: - fix string overflow - Add filtering support - Introduce dispatcher for SMM calls - Add a sysfs interface for SMBIOS tokens - only run if proper oem string is detected - Prefix class/select with cmd_ - Add pr_fmt definition to driver dell-smbios-smm: - test for WSMT dell-smbios-wmi: - release mutex lock on WMI call failure - introduce userspace interface - Add new WMI dispatcher driver dell-smo8800: - remove redundant assignments to byte_data dell-wmi: - don't check length returned - clean up wmi descriptor check - increase severity of some failures - Do not match on descriptor GUID modalias - Label driver as handling notifications dell-*wmi*: - Relay failed initial probe to dependent drivers dell-wmi-descriptor: - check if memory was allocated - split WMI descriptor into it's own driver fujitsu-laptop: - Fix radio LED detection - Don't oops when FUJ02E3 is not presnt hp_accel: - Add quirk for HP ProBook 440 G4 hp-wmi: - Fix tablet mode detection for convertibles ideapad-laptop: - Add Lenovo Yoga 920-13IKB to no_hw_rfkill dmi list intel_cht_int33fe: - Update fusb302 type string, add properties - make a couple of local functions static - Work around BIOS bug on some devices intel-hid: - Power button suspend on Dell Latitude 7275 intel_ips: - Convert timers to use timer_setup() - Remove FSF address from GPL notice - Remove unneeded fields and label - Keep pointer to struct device - Use PCI_VDEVICE() macro - Switch to new PCI IRQ allocation API - Simplify error handling via devres API intel_pmc_ipc: - Revert Use MFD framework to create dependent devices - Use MFD framework to create dependent devices - Use spin_lock to protect GCR updates - Use devm_* calls in driver probe function intel_punit_ipc: - Fix resource ioremap warning intel_telemetry: - Remove useless default in Kconfig - Add needed inclusion - cleanup redundant headers - Fix typos - Fix load failure info intel_telemetry_debugfs: - Use standard ARRAY_SIZE() macro intel_turbo_max_3: - Add Skylake platform intel-wmi-thunderbolt: - Silence error cases MAINTAINERS: - Add entry for the PEAQ WMI hotkeys driver mlx-platform: - make a couple of structures static peaq_wmi: - Fix missing terminating entry for peaq_dmi_table peaq-wmi: - Remove unnecessary checks from peaq_wmi_exit - Add DMI check before binding to the WMI interface - Revert Blacklist Lenovo ideapad 700-15ISK - Blacklist Lenovo ideapad 700-15ISK silead_dmi: - Add silead, home-button property to some tablets - Add entry for the Digma e200 tablet - Fix GP-electronic T701 entry - Add entry for the Chuwi Hi8 Pro tablet sony-laptop: - Drop variable assignment in sony_nc_setup_rfkill() - Fix error handling in sony_nc_setup_rfkill() thinkpad_acpi: - Implement tablet mode using GMMS method tools/wmi: - add a sample for dell smbios communication over WMI wmi: - release mutex on module acquistion failure - create userspace interface for drivers - Don't allow drivers to get each other's GUIDs - Add new method wmidev_evaluate_method - Destroy on cleanup rather than unregister - Cleanup exit routine in reverse order of init - Sort include list -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEhiZOUlnC9oKN3n3AmT3/83c5Sy0FAloQcs0ACgkQmT3/83c5 Sy2agQ//WJirmlqR4WMSDynq0w/rKomx7qMZvabbIxFc7n5beCUrlc61lt4x/cPN 0HrdkNcYvkW21j8q/Lk5RDlK45JLZLgtDb1rIGjx8Pkf+EXyKwNb4UtqaZuwZRN6 nVnSGAdShF6f4OqVQU+ZuRr2nQvBlK4OyopKuRaq0kuejJjMLq1sc7VNidvb9zdj w4zfhh8RQ2KV3NK8g0k/uQu573Y+tCDUQvxQj5YIgC4RWbv4ZTuZD1Hbjc3Vdy9+ z0RvrUBCikM0CTqVyXn/ncgiMnAj6oeLdB76F1dlaIaAH/WtisEWr3hLWHskdJwW N+qGBB0K72gUHwr4Ck4x2s/S76XeiFYD0BeHL3ODn6ZlKoh7gV2NVwYFDNQHd+uc MXN9Xzs3lRkiDFyoXbtBG0wZRn2rS1rhGSYDYQUKg8Qf7MirwEVdYA0CZKeXAA78 2V29FNdvUmWiL/ZiA/2peeuUTWgPdzENDLHXzE/jOCGBS2/pL4znYv2ZSJ+HIeyW oCVMxasSI3pMLxCU8KxgA1QwrbDoiFTYYXCa1Ighq9o2ZEoy7Ub1XmpBB9HKHby7 K6zQcCYcf+SyscIqvu50ZImZ8nt5FnIdPSrTOX/FMM0Niv42mfKwD+UniG+P5K1z OLCIEm74NE9jRjzxuW5E1DSo56gJHUbxxy1rOFzgJnGQ+CAVXKo= =upqs -----END PGP SIGNATURE----- Merge tag 'platform-drivers-x86-v4.15-1' of git://git.infradead.org/linux-platform-drivers-x86 Pull x86 platform driver updates from Andy Shevchenko: "Here is the collected material against Platform Drivers x86 subsystem. It's rather bit busy cycle for PDx86, mostly due to Dell SMBIOS driver activity For this cycle we have quite an update for the Dell SMBIOS driver including WMI work to provide an interface for SMBIOS tokens via sysfs and WMI support for 2017+ Dell laptop models. SMM dispatcher code is split into a separate driver followed by a new WMI dispatcher. The latter provides a character device interface to user space. The git history also contains a merge of immutable branch from Wolfram Sang in order to apply a dependent fix to the Intel CherryTrail Battery Management driver. Other Intel drivers got a lot of cleanups. The Turbo Boost Max 3.0 support is added for Intel Skylake. Peaq WMI hotkeys driver gets its own maintainer and white list of supported models. Silead DMI is expanded to support few additional platforms. Tablet mode via GMMS ACPI method is added to support some ThinkPad tablets. new driver: - Add driver to force WMI Thunderbolt controller power status asus-wmi: - Add lightbar led support dell-laptop: - Allocate buffer before rfkill use dell-smbios: - fix string overflow - Add filtering support - Introduce dispatcher for SMM calls - Add a sysfs interface for SMBIOS tokens - only run if proper oem string is detected - Prefix class/select with cmd_ - Add pr_fmt definition to driver dell-smbios-smm: - test for WSMT dell-smbios-wmi: - release mutex lock on WMI call failure - introduce userspace interface - Add new WMI dispatcher driver dell-smo8800: - remove redundant assignments to byte_data dell-wmi: - don't check length returned - clean up wmi descriptor check - increase severity of some failures - Do not match on descriptor GUID modalias - Label driver as handling notifications dell-*wmi*: - Relay failed initial probe to dependent drivers dell-wmi-descriptor: - check if memory was allocated - split WMI descriptor into it's own driver fujitsu-laptop: - Fix radio LED detection - Don't oops when FUJ02E3 is not presnt hp_accel: - Add quirk for HP ProBook 440 G4 hp-wmi: - Fix tablet mode detection for convertibles ideapad-laptop: - Add Lenovo Yoga 920-13IKB to no_hw_rfkill dmi list intel_cht_int33fe: - Update fusb302 type string, add properties - make a couple of local functions static - Work around BIOS bug on some devices intel-hid: - Power button suspend on Dell Latitude 7275 intel_ips: - Convert timers to use timer_setup() - Remove FSF address from GPL notice - Remove unneeded fields and label - Keep pointer to struct device - Use PCI_VDEVICE() macro - Switch to new PCI IRQ allocation API - Simplify error handling via devres API intel_pmc_ipc: - Revert Use MFD framework to create dependent devices - Use MFD framework to create dependent devices - Use spin_lock to protect GCR updates - Use devm_* calls in driver probe function intel_punit_ipc: - Fix resource ioremap warning intel_telemetry: - Remove useless default in Kconfig - Add needed inclusion - cleanup redundant headers - Fix typos - Fix load failure info intel_telemetry_debugfs: - Use standard ARRAY_SIZE() macro intel_turbo_max_3: - Add Skylake platform intel-wmi-thunderbolt: - Silence error cases mlx-platform: - make a couple of structures static peaq_wmi: - Fix missing terminating entry for peaq_dmi_table peaq-wmi: - Remove unnecessary checks from peaq_wmi_exit - Add DMI check before binding to the WMI interface - Revert Blacklist Lenovo ideapad 700-15ISK - Blacklist Lenovo ideapad 700-15ISK silead_dmi: - Add silead, home-button property to some tablets - Add entry for the Digma e200 tablet - Fix GP-electronic T701 entry - Add entry for the Chuwi Hi8 Pro tablet sony-laptop: - Drop variable assignment in sony_nc_setup_rfkill() - Fix error handling in sony_nc_setup_rfkill() thinkpad_acpi: - Implement tablet mode using GMMS method tools/wmi: - add a sample for dell smbios communication over WMI wmi: - release mutex on module acquistion failure - create userspace interface for drivers - Don't allow drivers to get each other's GUIDs - Add new method wmidev_evaluate_method - Destroy on cleanup rather than unregister - Cleanup exit routine in reverse order of init - Sort include list" * tag 'platform-drivers-x86-v4.15-1' of git://git.infradead.org/linux-platform-drivers-x86: (74 commits) platform/x86: silead_dmi: Add silead, home-button property to some tablets platform/x86: dell-laptop: Allocate buffer before rfkill use platform/x86: dell-*wmi*: Relay failed initial probe to dependent drivers platform/x86: dell-wmi-descriptor: check if memory was allocated platform/x86: Revert intel_pmc_ipc: Use MFD framework to create dependent devices platform/x86: dell-smbios-wmi: release mutex lock on WMI call failure platform/x86: wmi: release mutex on module acquistion failure platform/x86: dell-smbios: fix string overflow platform/x86: intel_pmc_ipc: Use MFD framework to create dependent devices platform/x86: intel_punit_ipc: Fix resource ioremap warning platform/x86: dell-smo8800: remove redundant assignments to byte_data platform/x86: hp-wmi: Fix tablet mode detection for convertibles platform/x86: intel_ips: Convert timers to use timer_setup() platform/x86: sony-laptop: Drop variable assignment in sony_nc_setup_rfkill() platform/x86: sony-laptop: Fix error handling in sony_nc_setup_rfkill() tools/wmi: add a sample for dell smbios communication over WMI platform/x86: dell-smbios-wmi: introduce userspace interface platform/x86: wmi: create userspace interface for drivers platform/x86: dell-smbios: Add filtering support platform/x86: dell-smbios-smm: test for WSMT ...
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=============
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Thunderbolt
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=============
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The interface presented here is not meant for end users. Instead there
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should be a userspace tool that handles all the low-level details, keeps
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database of the authorized devices and prompts user for new connections.
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More details about the sysfs interface for Thunderbolt devices can be
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found in ``Documentation/ABI/testing/sysfs-bus-thunderbolt``.
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Those users who just want to connect any device without any sort of
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manual work, can add following line to
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``/etc/udev/rules.d/99-local.rules``::
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ACTION=="add", SUBSYSTEM=="thunderbolt", ATTR{authorized}=="0", ATTR{authorized}="1"
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This will authorize all devices automatically when they appear. However,
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keep in mind that this bypasses the security levels and makes the system
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vulnerable to DMA attacks.
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Security levels and how to use them
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-----------------------------------
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Starting from Intel Falcon Ridge Thunderbolt controller there are 4
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security levels available. The reason for these is the fact that the
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connected devices can be DMA masters and thus read contents of the host
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memory without CPU and OS knowing about it. There are ways to prevent
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this by setting up an IOMMU but it is not always available for various
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reasons.
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The security levels are as follows:
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none
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All devices are automatically connected by the firmware. No user
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approval is needed. In BIOS settings this is typically called
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*Legacy mode*.
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user
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User is asked whether the device is allowed to be connected.
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Based on the device identification information available through
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``/sys/bus/thunderbolt/devices``. user then can do the decision.
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In BIOS settings this is typically called *Unique ID*.
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secure
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User is asked whether the device is allowed to be connected. In
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addition to UUID the device (if it supports secure connect) is sent
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a challenge that should match the expected one based on a random key
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written to ``key`` sysfs attribute. In BIOS settings this is
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typically called *One time saved key*.
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dponly
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The firmware automatically creates tunnels for Display Port and
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USB. No PCIe tunneling is done. In BIOS settings this is
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typically called *Display Port Only*.
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The current security level can be read from
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``/sys/bus/thunderbolt/devices/domainX/security`` where ``domainX`` is
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the Thunderbolt domain the host controller manages. There is typically
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one domain per Thunderbolt host controller.
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If the security level reads as ``user`` or ``secure`` the connected
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device must be authorized by the user before PCIe tunnels are created
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(e.g the PCIe device appears).
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Each Thunderbolt device plugged in will appear in sysfs under
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``/sys/bus/thunderbolt/devices``. The device directory carries
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information that can be used to identify the particular device,
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including its name and UUID.
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Authorizing devices when security level is ``user`` or ``secure``
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-----------------------------------------------------------------
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When a device is plugged in it will appear in sysfs as follows::
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/sys/bus/thunderbolt/devices/0-1/authorized - 0
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/sys/bus/thunderbolt/devices/0-1/device - 0x8004
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/sys/bus/thunderbolt/devices/0-1/device_name - Thunderbolt to FireWire Adapter
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/sys/bus/thunderbolt/devices/0-1/vendor - 0x1
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/sys/bus/thunderbolt/devices/0-1/vendor_name - Apple, Inc.
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/sys/bus/thunderbolt/devices/0-1/unique_id - e0376f00-0300-0100-ffff-ffffffffffff
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The ``authorized`` attribute reads 0 which means no PCIe tunnels are
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created yet. The user can authorize the device by simply::
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# echo 1 > /sys/bus/thunderbolt/devices/0-1/authorized
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This will create the PCIe tunnels and the device is now connected.
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If the device supports secure connect, and the domain security level is
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set to ``secure``, it has an additional attribute ``key`` which can hold
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a random 32 byte value used for authorization and challenging the device in
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future connects::
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/sys/bus/thunderbolt/devices/0-3/authorized - 0
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/sys/bus/thunderbolt/devices/0-3/device - 0x305
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/sys/bus/thunderbolt/devices/0-3/device_name - AKiTiO Thunder3 PCIe Box
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/sys/bus/thunderbolt/devices/0-3/key -
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/sys/bus/thunderbolt/devices/0-3/vendor - 0x41
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/sys/bus/thunderbolt/devices/0-3/vendor_name - inXtron
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/sys/bus/thunderbolt/devices/0-3/unique_id - dc010000-0000-8508-a22d-32ca6421cb16
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Notice the key is empty by default.
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If the user does not want to use secure connect it can just ``echo 1``
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to the ``authorized`` attribute and the PCIe tunnels will be created in
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the same way than in ``user`` security level.
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If the user wants to use secure connect, the first time the device is
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plugged a key needs to be created and send to the device::
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# key=$(openssl rand -hex 32)
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# echo $key > /sys/bus/thunderbolt/devices/0-3/key
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# echo 1 > /sys/bus/thunderbolt/devices/0-3/authorized
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Now the device is connected (PCIe tunnels are created) and in addition
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the key is stored on the device NVM.
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Next time the device is plugged in the user can verify (challenge) the
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device using the same key::
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# echo $key > /sys/bus/thunderbolt/devices/0-3/key
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# echo 2 > /sys/bus/thunderbolt/devices/0-3/authorized
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If the challenge the device returns back matches the one we expect based
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on the key, the device is connected and the PCIe tunnels are created.
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However, if the challenge failed no tunnels are created and error is
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returned to the user.
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If the user still wants to connect the device it can either approve
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the device without a key or write new key and write 1 to the
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``authorized`` file to get the new key stored on the device NVM.
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Upgrading NVM on Thunderbolt device or host
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-------------------------------------------
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Since most of the functionality is handled in a firmware running on a
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host controller or a device, it is important that the firmware can be
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upgraded to the latest where possible bugs in it have been fixed.
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Typically OEMs provide this firmware from their support site.
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There is also a central site which has links where to download firmwares
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for some machines:
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`Thunderbolt Updates <https://thunderbolttechnology.net/updates>`_
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Before you upgrade firmware on a device or host, please make sure it is
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the suitable. Failing to do that may render the device (or host) in a
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state where it cannot be used properly anymore without special tools!
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Host NVM upgrade on Apple Macs is not supported.
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Once the NVM image has been downloaded, you need to plug in a
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Thunderbolt device so that the host controller appears. It does not
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matter which device is connected (unless you are upgrading NVM on a
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device - then you need to connect that particular device).
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Note OEM-specific method to power the controller up ("force power") may
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be available for your system in which case there is no need to plug in a
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Thunderbolt device.
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After that we can write the firmware to the non-active parts of the NVM
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of the host or device. As an example here is how Intel NUC6i7KYK (Skull
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Canyon) Thunderbolt controller NVM is upgraded::
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# dd if=KYK_TBT_FW_0018.bin of=/sys/bus/thunderbolt/devices/0-0/nvm_non_active0/nvmem
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Once the operation completes we can trigger NVM authentication and
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upgrade process as follows::
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# echo 1 > /sys/bus/thunderbolt/devices/0-0/nvm_authenticate
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If no errors are returned, the host controller shortly disappears. Once
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it comes back the driver notices it and initiates a full power cycle.
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After a while the host controller appears again and this time it should
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be fully functional.
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We can verify that the new NVM firmware is active by running following
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commands::
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# cat /sys/bus/thunderbolt/devices/0-0/nvm_authenticate
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0x0
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# cat /sys/bus/thunderbolt/devices/0-0/nvm_version
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18.0
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If ``nvm_authenticate`` contains anything else than 0x0 it is the error
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code from the last authentication cycle, which means the authentication
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of the NVM image failed.
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Note names of the NVMem devices ``nvm_activeN`` and ``nvm_non_activeN``
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depends on the order they are registered in the NVMem subsystem. N in
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the name is the identifier added by the NVMem subsystem.
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Upgrading NVM when host controller is in safe mode
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--------------------------------------------------
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If the existing NVM is not properly authenticated (or is missing) the
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host controller goes into safe mode which means that only available
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functionality is flashing new NVM image. When in this mode the reading
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``nvm_version`` fails with ``ENODATA`` and the device identification
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information is missing.
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To recover from this mode, one needs to flash a valid NVM image to the
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host host controller in the same way it is done in the previous chapter.
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Networking over Thunderbolt cable
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---------------------------------
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Thunderbolt technology allows software communication across two hosts
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connected by a Thunderbolt cable.
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It is possible to tunnel any kind of traffic over Thunderbolt link but
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currently we only support Apple ThunderboltIP protocol.
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If the other host is running Windows or macOS only thing you need to
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do is to connect Thunderbolt cable between the two hosts, the
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``thunderbolt-net`` is loaded automatically. If the other host is also
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Linux you should load ``thunderbolt-net`` manually on one host (it does
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not matter which one)::
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# modprobe thunderbolt-net
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This triggers module load on the other host automatically. If the driver
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is built-in to the kernel image, there is no need to do anything.
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The driver will create one virtual ethernet interface per Thunderbolt
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port which are named like ``thunderbolt0`` and so on. From this point
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you can either use standard userspace tools like ``ifconfig`` to
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configure the interface or let your GUI to handle it automatically.
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Forcing power
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-------------
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Many OEMs include a method that can be used to force the power of a
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thunderbolt controller to an "On" state even if nothing is connected.
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If supported by your machine this will be exposed by the WMI bus with
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a sysfs attribute called "force_power".
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For example the intel-wmi-thunderbolt driver exposes this attribute in:
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/sys/devices/platform/PNP0C14:00/wmi_bus/wmi_bus-PNP0C14:00/86CCFD48-205E-4A77-9C48-2021CBEDE341/force_power
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To force the power to on, write 1 to this attribute file.
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To disable force power, write 0 to this attribute file.
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Note: it's currently not possible to query the force power state of a platform.
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