kernel/linux.git/drivers/thunderbolt/domain.c, branch v6.18.22

thunderbolt: Update domain.c function documentation

2025-09-17T05:32:58+00:00

Make domain.c function documentation compliant with current kernel-doc standards. No functional changes. Signed-off-by: Alan Borzeszkowski Signed-off-by: Mika Westerberg

thunderbolt: Use HMAC-SHA256 library instead of crypto_shash

2025-08-11T05:56:14+00:00

Use the hmac_sha256_usingrawkey() library function instead of the "hmac(sha256)" crypto_shash. This is simpler and faster. As a cleanup, change the input data parameters from "challenge, sizeof(hmac)" to "challenge, sizeof(challenge)", so that the size is being taken of the correct buffer. This is not a functional change, since it happens that sizeof(hmac) == sizeof(challenge). Replace the selection of CRYPTO and CRYPTO_HASH with CRYPTO_LIB_SHA256 and CRYPTO_LIB_UTILS. The latter is needed for crypto_memneq() which was previously being pulled in via CRYPTO. Signed-off-by: Eric Biggers Signed-off-by: Mika Westerberg

thunderbolt: Compare HMAC values in constant time

2025-08-11T05:56:13+00:00

To prevent timing attacks, HMAC value comparison needs to be constant time. Replace the memcmp() with the correct function, crypto_memneq(). Fixes: f67cf491175a ("thunderbolt: Add support for Internal Connection Manager (ICM)") Signed-off-by: Eric Biggers Signed-off-by: Mika Westerberg

thunderbolt: Fix copy+paste error in match_service_id()

2025-07-21T14:33:43+00:00

The second instance of TBSVC_MATCH_PROTOCOL_VERSION seems to have been intended to be TBSVC_MATCH_PROTOCOL_REVISION. Fixes: d1ff70241a27 ("thunderbolt: Add support for XDomain discovery protocol") Cc: stable Signed-off-by: Eric Biggers Link: https://lore.kernel.org/r/20250721050136.30004-1-ebiggers@kernel.org Signed-off-by: Greg Kroah-Hartman

thunderbolt: Introduce domain event message handler

2025-04-24T05:24:38+00:00

This patch introduces a function that can be used to send uevent notifications in the domain to userspace. For instance, it can indicate that a DisplayPort tunnel could not be established due to insufficient bandwidth. Userspace can then forward to user via dialog or similar. Convert boot_acl_store() to call this instead of open-coding. Signed-off-by: Alan Borzeszkowski Signed-off-by: Mika Westerberg

driver core: have match() callback in struct bus_type take a const *

2024-07-03T13:16:54+00:00

In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki Reviewed-by: Alex Elder Acked-by: Sumit Garg Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman

thunderbolt: Constify the struct device_type usage

2024-02-26T07:15:49+00:00

Since commit aed65af1cc2f ("drivers: make device_type const"), the driver core can properly handle constant struct device_type. Move the tb_domain_type, tb_retimer_type, tb_switch_type, usb4_port_device_type, tb_service_type and tb_xdomain_type variables to be constant structures as well, placing it into read-only memory which can not be modified at runtime. Cc: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Signed-off-by: Mika Westerberg

thunderbolt: Add trace events support for the control channel

2024-02-26T07:12:24+00:00

Sometimes it is useful to see the traffic happening inside the control channel, especially when debugging a possible problem. This adds tracepoints close to the hardware which can be enabled dynamically as needed using the standard Linux trace events facility. Signed-off-by: Gil Fine Co-developed-by: Mika Westerberg Signed-off-by: Mika Westerberg

thunderbolt: Reserve released DisplayPort bandwidth for a group for 10 seconds

2024-02-16T10:29:23+00:00

The USB4 spec says that the Connection Manager should reserve the bandwidth that is released in the same group for 10 seconds before it can be shared with other groups. Add support for this. We also delay the symmetric transition by that same 10 seconds to avoid any unnecessary transitions (i.e if the released bandwidth is used by another DisplayPort tunnel in the same group the link can stay asymmetric the whole time). Signed-off-by: Mika Westerberg

thunderbolt: Remove usage of the deprecated ida_simple_xx() API

2024-01-23T11:30:20+00:00

ida_alloc() and ida_free() should be preferred to the deprecated ida_simple_get() and ida_simple_remove(). Note that the upper limit of ida_simple_get() is exclusive, but the one of ida_alloc_range()/ida_alloc_max() is inclusive. So a -1 has been added when needed. Signed-off-by: Christophe JAILLET Signed-off-by: Mika Westerberg