From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- Documentation/ABI/testing/sysfs-driver-ccp | 120 +++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-ccp (limited to 'Documentation/ABI/testing/sysfs-driver-ccp') diff --git a/Documentation/ABI/testing/sysfs-driver-ccp b/Documentation/ABI/testing/sysfs-driver-ccp new file mode 100644 index 000000000..6ec74b9a2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-ccp @@ -0,0 +1,120 @@ +What: /sys/bus/pci/devices//fused_part +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//fused_part file reports + whether the CPU or APU has been fused to prevent tampering. + 0: Not fused + 1: Fused + +What: /sys/bus/pci/devices//boot_integrity +Date: April 2026 +KernelVersion: 6.20 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//boot_integrity reports + whether the AMD CPU or APU is used for a hardware root of trust + during the boot process. + Possible values: + 0: Not hardware root of trust. + 1: Hardware root of trust + + NOTE: Vendors may provide design specific alternative hardware + root of trust implementations. + +What: /sys/bus/pci/devices//debug_lock_on +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//debug_lock_on reports + whether the AMD CPU or APU has been unlocked for debugging. + Possible values: + 0: Not locked + 1: Locked + +What: /sys/bus/pci/devices//tsme_status +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//tsme_status file reports + the status of transparent secure memory encryption on AMD systems. + Possible values: + 0: Not active + 1: Active + +What: /sys/bus/pci/devices//anti_rollback_status +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//anti_rollback_status file reports + whether the PSP is enforcing rollback protection. + Possible values: + 0: Not enforcing + 1: Enforcing + +What: /sys/bus/pci/devices//rpmc_production_enabled +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//rpmc_production_enabled file reports + whether Replay Protected Monotonic Counter support has been enabled. + Possible values: + 0: Not enabled + 1: Enabled + +What: /sys/bus/pci/devices//rpmc_spirom_available +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//rpmc_spirom_available file reports + whether an Replay Protected Monotonic Counter supported SPI is installed + on the system. + Possible values: + 0: Not present + 1: Present + +What: /sys/bus/pci/devices//hsp_tpm_available +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//hsp_tpm_available file reports + whether the HSP TPM has been activated. + Possible values: + 0: Not activated or present + 1: Activated + +What: /sys/bus/pci/devices//rom_armor_enforced +Date: June 2022 +KernelVersion: 5.19 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//rom_armor_enforced file reports + whether RomArmor SPI protection is enforced. + Possible values: + 0: Not enforced + 1: Enforced + +What: /sys/bus/pci/devices//bootloader_version +Date: June 2023 +KernelVersion: 6.4 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//bootloader_version + file reports the firmware version of the AMD AGESA + bootloader. + +What: /sys/bus/pci/devices//tee_version +Date: June 2023 +KernelVersion: 6.4 +Contact: mario.limonciello@amd.com +Description: + The /sys/bus/pci/devices//tee_version + file reports the firmware version of the AMD Trusted + Execution Environment (TEE). -- cgit v1.3.1