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Wysocki" , Daniel Lezcano Cc: Zhang Rui , Lukasz Luba , Lukas Wunner , Ionut Nechita , linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Ionut Nechita Subject: [RFC PATCH 0/3] PCI: Add PCIe Gen 7 (128 GT/s) speed support Date: Tue, 17 Feb 2026 10:00:56 +0200 Message-ID: <20260217080102.206581-2-sunlightlinux@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ionut Nechita This RFC series adds initial kernel support for PCIe Gen 7 128 GT/s link speed, following the same pattern used for Gen 6 (64 GT/s). PCIe Gen 7 doubles the per-lane data rate to 128 GT/s using PAM4 signaling with mandatory Flit mode encoding (1:1, no overhead), providing up to 256 GB/s unidirectional (512 GB/s bi-directional) bandwidth on an x16 link. The specification was announced by PCI-SIG in 2022 and targeted for member release in 2025. The series covers: Patch 1: UAPI register definitions (LNKCAP, LNKCAP2, LNKCTL2) and pci_bus_speed enum. Widens supported_speeds from u8 to u16 to accommodate the expanded Supported Link Speeds Vector. Patch 2: Core PCI infrastructure - speed detection macros, bandwidth calculation with 1:1 Flit mode encoding, link speed table, display string, and a pcie_speed_requires_flit() helper with Flit mode diagnostic warning for Gen 6+ speeds. Patch 3: Subsystem updates for bandwidth control (bwctrl), port driver, and PCIe thermal cooling. Not included in this series (not yet defined in the specification): - Equalization presets for 128 GT/s (PCI_EXT_CAP_ID_PL_128GT) - DesignWare controller preset programming for Gen 7 This is marked as RFC since no PCIe Gen 7 hardware exists yet to validate the implementation. The register encoding values (LNKCAP SLS=0x7, LNKCAP2 SLS bit 6, LNKCTL2 TLS=0x7) follow the sequential pattern established by prior generations and are subject to change when the final specification is published. Tested: compile-tested only (no hardware available). Ionut Nechita (3): PCI: Add PCIe Gen 7 (128 GT/s) register and speed definitions PCI: Add PCIe Gen 7 (128 GT/s) speed detection and reporting PCI: Update bandwidth control and thermal cooling for Gen 7 (128 GT/s) drivers/pci/pci.c | 7 +++++-- drivers/pci/pci.h | 28 ++++++++++++++++++++++------ drivers/pci/pcie/bwctrl.c | 7 ++++--- drivers/pci/pcie/portdrv.c | 2 +- drivers/pci/probe.c | 3 ++- drivers/thermal/pcie_cooling.c | 1 + include/linux/pci.h | 3 ++- include/uapi/linux/pci_regs.h | 3 +++ 8 files changed, 40 insertions(+), 14 deletions(-) -- 2.53.0