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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 3/3] PCI: Update bandwidth control and thermal cooling for Gen 7 (128 GT/s) Date: Tue, 17 Feb 2026 10:01:02 +0200 Message-ID: <20260217080102.206581-8-sunlightlinux@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260217080102.206581-2-sunlightlinux@gmail.com> References: <20260217080102.206581-2-sunlightlinux@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ionut Nechita Update PCIe subsystem components to support 128 GT/s link speed: - bwctrl: Extend pcie_valid_speed() range to PCIE_SPEED_128_0GT, add PCIE_SPEED_128_0GT to speed conversion table, widen supported_speeds variables from u8 to u16 - portdrv: Switch hweight8() to hweight16() for supported_speeds to match the widened type - pcie_cooling: Add static_assert for PCIE_SPEED_128_0GT enum contiguity check Signed-off-by: Ionut Nechita --- drivers/pci/pcie/bwctrl.c | 7 ++++--- drivers/pci/pcie/portdrv.c | 2 +- drivers/thermal/pcie_cooling.c | 1 + 3 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/pci/pcie/bwctrl.c b/drivers/pci/pcie/bwctrl.c index 36f939f23d34e..b9125b40cb860 100644 --- a/drivers/pci/pcie/bwctrl.c +++ b/drivers/pci/pcie/bwctrl.c @@ -50,7 +50,7 @@ static DECLARE_RWSEM(pcie_bwctrl_setspeed_rwsem); static bool pcie_valid_speed(enum pci_bus_speed speed) { - return (speed >= PCIE_SPEED_2_5GT) && (speed <= PCIE_SPEED_64_0GT); + return (speed >= PCIE_SPEED_2_5GT) && (speed <= PCIE_SPEED_128_0GT); } static u16 pci_bus_speed2lnkctl2(enum pci_bus_speed speed) @@ -62,6 +62,7 @@ static u16 pci_bus_speed2lnkctl2(enum pci_bus_speed speed) [PCIE_SPEED_16_0GT] = PCI_EXP_LNKCTL2_TLS_16_0GT, [PCIE_SPEED_32_0GT] = PCI_EXP_LNKCTL2_TLS_32_0GT, [PCIE_SPEED_64_0GT] = PCI_EXP_LNKCTL2_TLS_64_0GT, + [PCIE_SPEED_128_0GT] = PCI_EXP_LNKCTL2_TLS_128_0GT, }; if (WARN_ON_ONCE(!pcie_valid_speed(speed))) @@ -70,7 +71,7 @@ static u16 pci_bus_speed2lnkctl2(enum pci_bus_speed speed) return speed_conv[speed]; } -static inline u16 pcie_supported_speeds2target_speed(u8 supported_speeds) +static inline u16 pcie_supported_speeds2target_speed(u16 supported_speeds) { return __fls(supported_speeds); } @@ -88,7 +89,7 @@ static inline u16 pcie_supported_speeds2target_speed(u8 supported_speeds) static u16 pcie_bwctrl_select_speed(struct pci_dev *port, enum pci_bus_speed speed_req) { struct pci_bus *bus = port->subordinate; - u8 desired_speeds, supported_speeds; + u16 desired_speeds, supported_speeds; struct pci_dev *dev; desired_speeds = GENMASK(pci_bus_speed2lnkctl2(speed_req), diff --git a/drivers/pci/pcie/portdrv.c b/drivers/pci/pcie/portdrv.c index 38a41ccf79b9a..5ee8795107f26 100644 --- a/drivers/pci/pcie/portdrv.c +++ b/drivers/pci/pcie/portdrv.c @@ -274,7 +274,7 @@ static int get_port_device_capability(struct pci_dev *dev) pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &linkcap); if (linkcap & PCI_EXP_LNKCAP_LBNC && - hweight8(dev->supported_speeds) > 1) + hweight16(dev->supported_speeds) > 1) services |= PCIE_PORT_SERVICE_BWCTRL; } diff --git a/drivers/thermal/pcie_cooling.c b/drivers/thermal/pcie_cooling.c index a876d64f15827..9a2e39398674b 100644 --- a/drivers/thermal/pcie_cooling.c +++ b/drivers/thermal/pcie_cooling.c @@ -75,6 +75,7 @@ static_assert(PCIE_SPEED_5_0GT + 1 == PCIE_SPEED_8_0GT); static_assert(PCIE_SPEED_8_0GT + 1 == PCIE_SPEED_16_0GT); static_assert(PCIE_SPEED_16_0GT + 1 == PCIE_SPEED_32_0GT); static_assert(PCIE_SPEED_32_0GT + 1 == PCIE_SPEED_64_0GT); +static_assert(PCIE_SPEED_64_0GT + 1 == PCIE_SPEED_128_0GT); MODULE_AUTHOR("Ilpo Järvinen "); MODULE_DESCRIPTION("PCIe cooling driver"); -- 2.53.0