From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/pci/hotplug/pciehp_ctrl.c | 431 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 431 insertions(+) create mode 100644 drivers/pci/hotplug/pciehp_ctrl.c (limited to 'drivers/pci/hotplug/pciehp_ctrl.c') diff --git a/drivers/pci/hotplug/pciehp_ctrl.c b/drivers/pci/hotplug/pciehp_ctrl.c new file mode 100644 index 000000000..529c34808 --- /dev/null +++ b/drivers/pci/hotplug/pciehp_ctrl.c @@ -0,0 +1,431 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * PCI Express Hot Plug Controller Driver + * + * Copyright (C) 1995,2001 Compaq Computer Corporation + * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001 IBM Corp. + * Copyright (C) 2003-2004 Intel Corporation + * + * All rights reserved. + * + * Send feedback to , + * + */ + +#define dev_fmt(fmt) "pciehp: " fmt + +#include +#include +#include +#include +#include "pciehp.h" + +/* The following routines constitute the bulk of the + hotplug controller logic + */ + +#define SAFE_REMOVAL true +#define SURPRISE_REMOVAL false + +static void set_slot_off(struct controller *ctrl) +{ + /* + * Turn off slot, turn on attention indicator, turn off power + * indicator + */ + if (POWER_CTRL(ctrl)) { + pciehp_power_off_slot(ctrl); + + /* + * After turning power off, we must wait for at least 1 second + * before taking any action that relies on power having been + * removed from the slot/adapter. + */ + msleep(1000); + } + + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, + PCI_EXP_SLTCTL_ATTN_IND_ON); +} + +/** + * board_added - Called after a board has been added to the system. + * @ctrl: PCIe hotplug controller where board is added + * + * Turns power on for the board. + * Configures board. + */ +static int board_added(struct controller *ctrl) +{ + int retval = 0; + struct pci_bus *parent = ctrl->pcie->port->subordinate; + + if (POWER_CTRL(ctrl)) { + /* Power on slot */ + retval = pciehp_power_on_slot(ctrl); + if (retval) + return retval; + } + + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK, + INDICATOR_NOOP); + + /* Check link training status */ + retval = pciehp_check_link_status(ctrl); + if (retval) + goto err_exit; + + /* Check for a power fault */ + if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) { + ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl)); + retval = -EIO; + goto err_exit; + } + + retval = pciehp_configure_device(ctrl); + if (retval) { + if (retval != -EEXIST) { + ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n", + pci_domain_nr(parent), parent->number); + goto err_exit; + } + } + + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON, + PCI_EXP_SLTCTL_ATTN_IND_OFF); + return 0; + +err_exit: + set_slot_off(ctrl); + return retval; +} + +/** + * remove_board - Turn off slot and Power Indicator + * @ctrl: PCIe hotplug controller where board is being removed + * @safe_removal: whether the board is safely removed (versus surprise removed) + */ +static void remove_board(struct controller *ctrl, bool safe_removal) +{ + pciehp_unconfigure_device(ctrl, safe_removal); + + if (POWER_CTRL(ctrl)) { + pciehp_power_off_slot(ctrl); + + /* + * After turning power off, we must wait for at least 1 second + * before taking any action that relies on power having been + * removed from the slot/adapter. + */ + msleep(1000); + + /* Ignore link or presence changes caused by power off */ + atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC), + &ctrl->pending_events); + } + + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, + INDICATOR_NOOP); +} + +static int pciehp_enable_slot(struct controller *ctrl); +static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal); + +void pciehp_request(struct controller *ctrl, int action) +{ + atomic_or(action, &ctrl->pending_events); + if (!pciehp_poll_mode) + irq_wake_thread(ctrl->pcie->irq, ctrl); +} + +void pciehp_queue_pushbutton_work(struct work_struct *work) +{ + struct controller *ctrl = container_of(work, struct controller, + button_work.work); + + mutex_lock(&ctrl->state_lock); + switch (ctrl->state) { + case BLINKINGOFF_STATE: + pciehp_request(ctrl, DISABLE_SLOT); + break; + case BLINKINGON_STATE: + pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC); + break; + default: + break; + } + mutex_unlock(&ctrl->state_lock); +} + +void pciehp_handle_button_press(struct controller *ctrl) +{ + mutex_lock(&ctrl->state_lock); + switch (ctrl->state) { + case OFF_STATE: + case ON_STATE: + if (ctrl->state == ON_STATE) { + ctrl->state = BLINKINGOFF_STATE; + ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n", + slot_name(ctrl)); + } else { + ctrl->state = BLINKINGON_STATE; + ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n", + slot_name(ctrl)); + } + /* blink power indicator and turn off attention */ + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK, + PCI_EXP_SLTCTL_ATTN_IND_OFF); + schedule_delayed_work(&ctrl->button_work, 5 * HZ); + break; + case BLINKINGOFF_STATE: + case BLINKINGON_STATE: + /* + * Cancel if we are still blinking; this means that we + * press the attention again before the 5 sec. limit + * expires to cancel hot-add or hot-remove + */ + ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl)); + cancel_delayed_work(&ctrl->button_work); + if (ctrl->state == BLINKINGOFF_STATE) { + ctrl->state = ON_STATE; + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON, + PCI_EXP_SLTCTL_ATTN_IND_OFF); + } else { + ctrl->state = OFF_STATE; + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, + PCI_EXP_SLTCTL_ATTN_IND_OFF); + } + ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n", + slot_name(ctrl)); + break; + default: + ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n", + slot_name(ctrl), ctrl->state); + break; + } + mutex_unlock(&ctrl->state_lock); +} + +void pciehp_handle_disable_request(struct controller *ctrl) +{ + mutex_lock(&ctrl->state_lock); + switch (ctrl->state) { + case BLINKINGON_STATE: + case BLINKINGOFF_STATE: + cancel_delayed_work(&ctrl->button_work); + break; + } + ctrl->state = POWEROFF_STATE; + mutex_unlock(&ctrl->state_lock); + + ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL); +} + +void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events) +{ + int present, link_active; + + /* + * If the slot is on and presence or link has changed, turn it off. + * Even if it's occupied again, we cannot assume the card is the same. + */ + mutex_lock(&ctrl->state_lock); + switch (ctrl->state) { + case BLINKINGOFF_STATE: + cancel_delayed_work(&ctrl->button_work); + fallthrough; + case ON_STATE: + ctrl->state = POWEROFF_STATE; + mutex_unlock(&ctrl->state_lock); + if (events & PCI_EXP_SLTSTA_DLLSC) + ctrl_info(ctrl, "Slot(%s): Link Down\n", + slot_name(ctrl)); + if (events & PCI_EXP_SLTSTA_PDC) + ctrl_info(ctrl, "Slot(%s): Card not present\n", + slot_name(ctrl)); + pciehp_disable_slot(ctrl, SURPRISE_REMOVAL); + break; + default: + mutex_unlock(&ctrl->state_lock); + break; + } + + /* Turn the slot on if it's occupied or link is up */ + mutex_lock(&ctrl->state_lock); + present = pciehp_card_present(ctrl); + link_active = pciehp_check_link_active(ctrl); + if (present <= 0 && link_active <= 0) { + mutex_unlock(&ctrl->state_lock); + return; + } + + switch (ctrl->state) { + case BLINKINGON_STATE: + cancel_delayed_work(&ctrl->button_work); + fallthrough; + case OFF_STATE: + ctrl->state = POWERON_STATE; + mutex_unlock(&ctrl->state_lock); + if (present) + ctrl_info(ctrl, "Slot(%s): Card present\n", + slot_name(ctrl)); + if (link_active) + ctrl_info(ctrl, "Slot(%s): Link Up\n", + slot_name(ctrl)); + ctrl->request_result = pciehp_enable_slot(ctrl); + break; + default: + mutex_unlock(&ctrl->state_lock); + break; + } +} + +static int __pciehp_enable_slot(struct controller *ctrl) +{ + u8 getstatus = 0; + + if (MRL_SENS(ctrl)) { + pciehp_get_latch_status(ctrl, &getstatus); + if (getstatus) { + ctrl_info(ctrl, "Slot(%s): Latch open\n", + slot_name(ctrl)); + return -ENODEV; + } + } + + if (POWER_CTRL(ctrl)) { + pciehp_get_power_status(ctrl, &getstatus); + if (getstatus) { + ctrl_info(ctrl, "Slot(%s): Already enabled\n", + slot_name(ctrl)); + return 0; + } + } + + return board_added(ctrl); +} + +static int pciehp_enable_slot(struct controller *ctrl) +{ + int ret; + + pm_runtime_get_sync(&ctrl->pcie->port->dev); + ret = __pciehp_enable_slot(ctrl); + if (ret && ATTN_BUTTN(ctrl)) + /* may be blinking */ + pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF, + INDICATOR_NOOP); + pm_runtime_put(&ctrl->pcie->port->dev); + + mutex_lock(&ctrl->state_lock); + ctrl->state = ret ? OFF_STATE : ON_STATE; + mutex_unlock(&ctrl->state_lock); + + return ret; +} + +static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal) +{ + u8 getstatus = 0; + + if (POWER_CTRL(ctrl)) { + pciehp_get_power_status(ctrl, &getstatus); + if (!getstatus) { + ctrl_info(ctrl, "Slot(%s): Already disabled\n", + slot_name(ctrl)); + return -EINVAL; + } + } + + remove_board(ctrl, safe_removal); + return 0; +} + +static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal) +{ + int ret; + + pm_runtime_get_sync(&ctrl->pcie->port->dev); + ret = __pciehp_disable_slot(ctrl, safe_removal); + pm_runtime_put(&ctrl->pcie->port->dev); + + mutex_lock(&ctrl->state_lock); + ctrl->state = OFF_STATE; + mutex_unlock(&ctrl->state_lock); + + return ret; +} + +int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot) +{ + struct controller *ctrl = to_ctrl(hotplug_slot); + + mutex_lock(&ctrl->state_lock); + switch (ctrl->state) { + case BLINKINGON_STATE: + case OFF_STATE: + mutex_unlock(&ctrl->state_lock); + /* + * The IRQ thread becomes a no-op if the user pulls out the + * card before the thread wakes up, so initialize to -ENODEV. + */ + ctrl->request_result = -ENODEV; + pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC); + wait_event(ctrl->requester, + !atomic_read(&ctrl->pending_events) && + !ctrl->ist_running); + return ctrl->request_result; + case POWERON_STATE: + ctrl_info(ctrl, "Slot(%s): Already in powering on state\n", + slot_name(ctrl)); + break; + case BLINKINGOFF_STATE: + case ON_STATE: + case POWEROFF_STATE: + ctrl_info(ctrl, "Slot(%s): Already enabled\n", + slot_name(ctrl)); + break; + default: + ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n", + slot_name(ctrl), ctrl->state); + break; + } + mutex_unlock(&ctrl->state_lock); + + return -ENODEV; +} + +int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot) +{ + struct controller *ctrl = to_ctrl(hotplug_slot); + + mutex_lock(&ctrl->state_lock); + switch (ctrl->state) { + case BLINKINGOFF_STATE: + case ON_STATE: + mutex_unlock(&ctrl->state_lock); + pciehp_request(ctrl, DISABLE_SLOT); + wait_event(ctrl->requester, + !atomic_read(&ctrl->pending_events) && + !ctrl->ist_running); + return ctrl->request_result; + case POWEROFF_STATE: + ctrl_info(ctrl, "Slot(%s): Already in powering off state\n", + slot_name(ctrl)); + break; + case BLINKINGON_STATE: + case OFF_STATE: + case POWERON_STATE: + ctrl_info(ctrl, "Slot(%s): Already disabled\n", + slot_name(ctrl)); + break; + default: + ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n", + slot_name(ctrl), ctrl->state); + break; + } + mutex_unlock(&ctrl->state_lock); + + return -ENODEV; +} -- cgit v1.2.3