Changes in configfs-thunderbolt_stream

67f8bc848ee31831336bd478e57d2f993551902e - Merge drm/drm-fixes into drm-misc-fixes

Tue, 01 Sep 2026 09:38:51 +0200

Merge drm/drm-fixes into drm-misc-fixesLet's start the 7.3 drm-misc-fixes cycle.Signed-off-by: Maxime Ripard List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

b2128290c29902315e632ea59e0504d6bc9e9b42 - Merge remote-tracking branch 'drm/drm-next' into msm-next-backmerge

Sat, 18 Jul 2026 17:06:55 +0200

Merge remote-tracking branch 'drm/drm-next' into msm-next-backmergeBackmerge of drm-next, mainly to pick up dt bindings docs updates toavoid conflicts.Signed-off-by: Rob Clark List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

f4d50813c0958b7d6bc79a7e0a77193372cbfd03 - Merge tag 'usb-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Tue, 25 Aug 2026 19:44:46 +0200

Merge tag 'usb-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usbPull USB / Thunderbolt updates from Greg KH: "Here is the big set of USB and Thunderbolt driver updates for 7.3-rc1. Lots of driver work for new devices and systems, and many other minor fixes and updates. Included in here are: - Thunderbolt subsystem driver updates and additions - typec driver updates and additions - usb gadget fixes all over the place, seems like people are finally paying attention to these drivers for some reason - xhci driver updates and fixes based on lots of reports - usb-serial driver updates and additions - new device ids - other minor USB driver updates and fixes All of these have been in linux-next for a while with no reported issues"* tag 'usb-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (163 commits) usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() usb: typec: hd3ss3220: fix VBUS regulator error message usb: usbfs: fix use-after-free of usb_device in usbdev_release() usb: gadget: u_audio: Fix use-after-free on sound card disconnect usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition usb: gadget: f_tcm: keep port count until LUN teardown completes usb: usbtest: disable dynamic ID support usb: typec: tcpci: pass correct rx_type to tcpm_pd_receive() USB: c67x00: fix use-after-free in c67x00_add_iso_urb() usb: typec: ucsi: use UCSI_TIMEOUT_MS for sync command completion usb: gadget: snps_udc_plat: clean up PHY on probe deferral usb: gadget: f_tcm: fix deadlock in usbg_make_tpg() usb: dwc2: gadget: Exit partial power down state when changing USB pull-up usb: gadget: f_fs: Fix Use-After-Free in AIO error path usb: gadget: f_fs: Prevent deadlock during ep0 read loop usb: gadget: at91_udc: drain polled-VBUS timer/work before udc is freed usb: gadget: midi2: remove default configfs groups on teardown usb: gadget: uvc: Fix null pointer dereference in uvcg_video_init() usb: typec: thunderbolt: Disable work before freeing tbt on remove usb: xhci: Handle bogus TRB pointers in Missed Service Error events ... List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

e1e6e541c5c9cf548e9fdc35fc26808c82074440 - Merge tag 'thunderbolt-for-v7.3-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-next

Wed, 19 Aug 2026 10:01:59 +0200

Merge tag 'thunderbolt-for-v7.3-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-nextMika writes:thunderbolt: Changes for v7.3 merge windowThis includes following USB4/Thunderbolt changes for the v7.3 mergewindow: - Assert Downstream Port Reset for Thunderbolt 3 devices during shutdown to avoid unnecessary delays over warm reset. - Tidy up Thunderbolt service ->probe callbacks. - USB4STREAM improvements. - AMD host interface quirk to fix Tx ring hang on teardown of a DMA tunnel. - Minor fixes and cleanups.All these have been in linux-next with no reported issues.* tag 'thunderbolt-for-v7.3-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt: thunderbolt: Clamp DMA tunnel credits to what a hop register can hold thunderbolt: Use min() for the DMA path credit cap thunderbolt: debugfs: Replace get_zeroed_page() with kzalloc() thunderbolt: Add quirk to reset host interface on DMA path teardown for AMD USB4 routers thunderbolt: stream: Add support for busy polling thunderbolt: Make interrupt optional for rings thunderbolt: stream: Support IOCB_NOWAIT in non-blocking I/O as well thunderbolt: stream: Fix possible short reads/writes thunderbolt: stream: Restore consumer if copying from iter fails thunderbolt: Remove redundant dev_err_probe() docs: admin-guide: thunderbolt: Fix sentence structure thunderbolt: xdomain: Notify peers after enumeration thunderbolt: Drop comma after device id array terminator thunderbolt: Assert that a service driver has a probe callback thunderbolt: Stop passing matched device ID to .probe() thunderbolt: Assert downstream port reset on shutdown List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

637315cb400eed1dbe721954fea437a61a2d65b2 - Merge tag 'kvm-riscv-7.3-1' of https://github.com/kvm-riscv/linux into HEAD

Tue, 18 Aug 2026 13:07:31 +0200

Merge tag 'kvm-riscv-7.3-1' of https://github.com/kvm-riscv/linux into HEADKVM/riscv changes for 7.3- Svadu/Zicfiss/Zicfilp FWFT support for Guest- Use try_cmpxchg for IMSIC MRIF RMW- More arch-specific tracepoints in KVM RISC-V- Eager Page Splitting for KVM RISC-V- Optimize hfence request handling for SMP Guests- Improve dirty log clearing by skipping zero bits in mask- Guard HFENCE range loops against overflow- CPU PM notifiers in KVM RISC-V for non-retentive idle states- Fix kernel-mode vector context save/restore for Guest List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

e120d14d03b3db5f4ac049f32328c4951a532a90 - thunderbolt: stream: Add support for busy polling

Thu, 18 Jun 2026 06:27:22 +0200

thunderbolt: stream: Add support for busy pollingUsing interrupts and scheduling workers increase latency so latencycritical applications may want to avoid that. Make this possible inUSB4STREAM by adding a new ConfigFS attribute: busy_poll that, whenactivated switches the rings to polling mode. The cost for lower latencyis that this burns more CPU cycles and things like poll(2) cannot beused.Assisted-by: Claude:claude-opus-4-8Signed-off-by: Mika Westerberg List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

efe86f088f48f18c27b648e5724048947f3b7fb4 - Merge drm/drm-next into drm-xe-next

Tue, 14 Jul 2026 15:40:31 +0200

Merge drm/drm-next into drm-xe-nextSync some i915/display changesSigned-off-by: Rodrigo Vivi List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

6d177908bad5992e17669030db41caab88041d5e - Merge drm/drm-next into drm-intel-next

Tue, 30 Jun 2026 14:55:43 +0200

Merge drm/drm-next into drm-intel-nextSync with v7.2-rc1.Signed-off-by: Jani Nikula List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

827b9aabd3ea3e96d5e48abed9f44dbd1e550d4e - Merge drm/drm-next into drm-misc-next

Tue, 30 Jun 2026 10:16:00 +0200

Merge drm/drm-next into drm-misc-nextBackmerging to get drm-misc-next to v7.2-rc1.Signed-off-by: Thomas Zimmermann List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

7dd19adaaac9a161723a24de7c270861063ec6ac - Merge tag 'v7.2-rc1' into drm-rust-next

Sun, 28 Jun 2026 22:39:43 +0200

Merge tag 'v7.2-rc1' into drm-rust-nextMerge v7.2-rc1 into drm-rust-next to start the next cycle.Devres now requires T: 'static, which conflicts with shmem::Object usingDevres> without that bound. Resolve by adding 'staticas a supertrait to DriverObject and DeviceContext, which does notrestrict any current use cases since DriverObject is always implementedon owned, refcounted types and DeviceContext is a sealed marker traitwith only unit-type implementors.If DriverObject (or DeviceContext) ever becomes lifetime-parameterized(e.g. via a GAT for TTM backed objects), the 'static supertrait can berelaxed at that point.Signed-off-by: Danilo Krummrich List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

3d5e48944e824bddc20d7b874e784f7b279636fe - Merge branch 'for-7.3/steam' into for-linus

Wed, 19 Aug 2026 09:16:28 +0200

Merge branch 'for-7.3/steam' into for-linus- initial support for 2026 Steam Controller (Vicki Pfau)- support for sensor events on the 2025 Steam Controller (Vicki Pfau)- assorted fixes, improvements and code refactoring (Vicki Pfau) List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

0eaed89c18aeedf0898baf2dbf5ff027c6795152 - Merge tag 'timers-v7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource

Mon, 17 Aug 2026 10:29:52 +0200

Merge tag 'timers-v7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource - Use designated initializers for sh_mtu2, sh_cmt, and sh_tmu, and drop the unused initializer in the platform_device_id table for sh_mtu2 (Uwe Kleine-König) - Remove redundant dev_err()/dev_err_probe() messages when devm_request_*_irq() fails, as the helper already logs an error message (Pan Chuang) - Fix a boot hang on Allwinner D1 when a forced minimum delta is used with the sun4i timer (Felix Yan) - Fix an IRQ leak in the cpuhp_setup_state() error path by freeing the IRQ on failure in the NXP PIT driver (WenTao Liang) - Fix incorrect unmapping of shared MMIO between the clocksource and clockevent drivers. If one of them fails to initialize, the error path unmaps the shared MMIO region, leaving the other driver with an invalid mapping on clps711x (Guangshuo Li) - Make the samsung_pwm driver compatible with PREEMPT_RT by replacing regular spinlocks with raw_spinlock_t in atomic contexts (Marek Szyprowski) - Use __raw_readl() and __raw_writel() instead of ioread32() and iowrite32() to support SWAP_IO_SPACE in the rtl-otto driver (Rustam Adilov) - Fix a missing clk_disable_unprepare() call in the timer initialization error path of the Armada driver (Yuho Choi)Link: https://lore.kernel.org/lkml/75feea31-683d-45a1-87f4-ab045e0152ae@oss.qualcomm.com List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

b4d85f863e5a6f1fa01b186001af0f68f4f5239e - Merge branch 'next' into for-linus

Sat, 15 Aug 2026 06:26:07 +0200

Merge branch 'next' into for-linusPrepare input updates for 7.3 merge window. List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

76904fccf81936c084faebc73ac72c0919a42941 - Merge tag 'v7.2-rc3' into next

Tue, 14 Jul 2026 04:06:00 +0200

Merge tag 'v7.2-rc3' into nextSync up with mainline to pull in stable fixes to avoid merge conflicts. List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

00599d4841790d05401820a96cf7edb193888b00 - Merge drm/drm-fixes into drm-misc-fixes

Mon, 29 Jun 2026 17:58:00 +0200

Merge drm/drm-fixes into drm-misc-fixesPull in tag v7.2-rc1 so that drm-misc-fixes becomes useful again,and drm-misc-next-fixes can be closed.Signed-off-by: Maarten Lankhorst List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

364f4a55c661641c02c86a849f0608d8fc3c0006 - Merge tag 'usb-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Mon, 22 Jun 2026 21:09:47 +0200

Merge tag 'usb-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usbPull USB and Thunderbolt driver updates from Greg KH: "Here is the big set of USB and Thunderbolt driver changes for 7.2-rc1. Lots of little stuff in here, major highlights include: - USB4STREAM support for Thunderbolt devices. A new way to send "raw" data very quickly over a USB4 connection to another system directly - Other thunderbolt updates and changes to make the stream code work - xhci driver updates and additions - typec driver updates and additions - usb gadget driver updates and fixes for reported issues - zh_CN documentation translation of the USB documentation - usb-serial driver updates - dts cleanups for some USB platforms - other minor USB driver updates and tweaks All of these have been in linux-next for over a week with no reported issues, most of them for many many weeks"* tag 'usb-7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (131 commits) usb: ucsi: huawei_gaokun: support mode switching thunderbolt: debugfs: Fix sideband write size check thunderbolt: debugfs: Fix margining error counter buffer leak usb: host: xhci-rcar: Split R-Car Gen2 and Gen3 .plat_start() handling usb: host: xhci-rcar: Remove SET_XHCI_PLAT_PRIV_FOR_RCAR() macro usb: xhci: allocate internal DCBAA mirror dynamically usb: xhci: allocate DCBAA based on host controller max slots usb: xhci: refactor DCBAA struct xhci: Prevent queuing new commands if xhci is inaccessible xhci: dbc: detect and recover hung DbC during enumeraton xhci: dbc: add timestamps to DbC state changes in a new helper. xhci: dbc: add helper to set and clear DbC DCE enable bit xhci: dbc: serialize enabling and disabling dbc xhci: dbc: Fix sysfs ABI Documentation for xhci dbc states usb: xhci: Improve Soft Retries after short transfers usb: xhci: Remove isochronous URB_SHORT_NOT_OK handling usb: xhci: Remove skip_isoc_td() usb: xhci: Simplify xhci_quiesce() usb: xhci: remove legacy 'num_trbs_free' tracking usb: xhci: fix typo in xhci_set_port_power() comment ... List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

f176a7c3e44f80b4493d22aa12d02673243ec7d8 - Merge tag 'thunderbolt-for-v7.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-next

Fri, 12 Jun 2026 10:44:24 +0200

Merge tag 'thunderbolt-for-v7.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-nextMika writes:thunderbolt: Changes for v7.2 merge windowThis includes following USB4/Thunderbolt changes for the v7.2 mergewindow: - Make the driver more compliant with the connection manager guide. - Improvements over Thunderbolt XDomain service handling. - USB4STREAM driver. - Split out PCIe bits into pci.c to allow the driver to work on non-PCIe hosts as well. - Various fixes and improvements.All these have been in linux-next with no reported issues.* tag 'thunderbolt-for-v7.2-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt: (41 commits) thunderbolt: debugfs: Fix sideband write size check thunderbolt: debugfs: Fix margining error counter buffer leak thunderbolt: test: Release third DP tunnel thunderbolt: Prevent XDomain delayed work use-after-free on disconnect thunderbolt: test: Add KUnit tests for property parser bounds checks thunderbolt: Add some more descriptive probe error messages thunderbolt: Require nhi->ops be valid thunderbolt: Separate out common NHI bits thunderbolt: Move pci_device out of tb_nhi thunderbolt: Increase Notification Timeout to 255 ms for USB4 routers thunderbolt: Increase timeout for Configuration Ready bit thunderbolt: Verify Router Ready bit is set after router enumeration thunderbolt: Verify PCIe adapter in detect state before tunnel setup thunderbolt: Activate path hops from source to destination thunderbolt: Fix lane bonding log when bonding not possible thunderbolt: Don't access path config space on Lane 1 adapters in tb_switch_reset_host() thunderbolt: Improve multi-display DisplayPort tunnel allocation docs: admin-guide: thunderbolt: Add instructions how to use USB4STREAM thunderbolt: Add support for USB4STREAM thunderbolt: Add support for ConfigFS ... List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream

6db21d817b43f8ce5654ccc7aff80d40e4dba4ac - thunderbolt: Add support for USB4STREAM

Tue, 12 Aug 2025 12:56:30 +0200

thunderbolt: Add support for USB4STREAMIntroduce USB4STREAM protocol and Linux implementation. This allows two(or more) hosts to transfer data directly over Thunderbolt/USB4 cablethrough a character device without need to go through the network stack.Any application that supports read(2) and write(2) in some form shouldbe able to use the device without changes. The data is sent out to theother side over a tunnel inside Thunderbolt/USB4 fabric. The characterdevice is called /dev/tbstreamX where X is the minor number startingfrom 0.All stream devices need to be configured first. This is done throughConfigFS interface. There can be multiple streams at the same time (thisdepends on number of DMA rings and available HopIDs) and a single streamsupports traffic in both directions. For example there could be anapplication that uses one stream as control channel and another one asbi-directional data channel.A real use-case for this is to take a backup as a part of recoveryinitramfs tooling (no need to setup networking or have ssh or similartooling as part of the initramfs). Say we want to backup the disk ofhost1 to host2. First Thunderbolt/USB4 cable is connected between thehosts (there can be devices in the middle too) then the receiving sideconfigures the stream: host2 # mkdir /sys/kernel/config/thunderbolt/stream/0-1.0 host2 # mkdir /sys/kernel/config/thunderbolt/stream/0-1.0/backup host2 # echo -1 > /sys/kernel/config/thunderbolt/stream/0-1.0/backup/in_hopid host2 # echo -1 > /sys/kernel/config/thunderbolt/stream/0-1.0/backup/out_hopidWe use automatic HopID allocation (writing -1 to HopIDs) for simplicity.From this point forward the /dev/tbstream0 can be used pretty much asregular file: host2 # dd if=/dev/tbstream0 of=/tmp/host1.nvme0n1.backup-$(date +%F) bs=256kThe host that is being backed up then configures the stream accordingly: host1 # mkdir /sys/kernel/config/thunderbolt/stream/0-503.0 host1 # mkdir /sys/kernel/config/thunderbolt/stream/0-503.0/backupHere we take advantage of the fact that host2 also announces the activestreams through XDomain properties so the name "backup" gives us theHopIDs. It is also possible to configure them manually in the same waywe did for host2.Then it is just a matter of copying the data over: host1 # dd if=/dev/nvme0n1 of=/dev/tbstream0 bs=256kSimilarly it is possible to transfer parts of the filesystem. Forexample copy contents of mydir over to the host2: host2 # gunzip < /dev/tbstream0 | tar xf - host1 # tar cf - mydir | gzip > /dev/tbstream0Other end of the spectrum use-case is "borrowing" laptop (host1) camerato desktop (host2): host2 # gst-launch-1.0 filesrc location=/dev/tbstream0 ! jpegdec ! videoconvert ! \ autovideosink host1 # gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1920,height=1080 ! \ jpegenc quality=90 ! filesink location=/dev/tbstream0Once the streams are no longer needed they can be removed: host1 # cd /sys/kernel/config/thunderbolt/stream/ host1 # rmdir -p 0-503.0/backup host2 # cd /sys/kernel/config/thunderbolt/stream host2 # rmdir -p 0-1.0/backupCo-developed-by: Alan Borzeszkowski Signed-off-by: Alan Borzeszkowski Signed-off-by: Mika Westerberg List of files: /linux/Documentation/ABI/testing/configfs-thunderbolt_stream