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/bus/bt1-apb.c | 419 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 419 insertions(+) create mode 100644 drivers/bus/bt1-apb.c (limited to 'drivers/bus/bt1-apb.c') diff --git a/drivers/bus/bt1-apb.c b/drivers/bus/bt1-apb.c new file mode 100644 index 000000000..63b1b4a76 --- /dev/null +++ b/drivers/bus/bt1-apb.c @@ -0,0 +1,419 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC + * + * Authors: + * Serge Semin + * + * Baikal-T1 APB-bus driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define APB_EHB_ISR 0x00 +#define APB_EHB_ISR_PENDING BIT(0) +#define APB_EHB_ISR_MASK BIT(1) +#define APB_EHB_ADDR 0x04 +#define APB_EHB_TIMEOUT 0x08 + +#define APB_EHB_TIMEOUT_MIN 0x000003FFU +#define APB_EHB_TIMEOUT_MAX 0xFFFFFFFFU + +/* + * struct bt1_apb - Baikal-T1 APB EHB private data + * @dev: Pointer to the device structure. + * @regs: APB EHB registers map. + * @res: No-device error injection memory region. + * @irq: Errors IRQ number. + * @rate: APB-bus reference clock rate. + * @pclk: APB-reference clock. + * @prst: APB domain reset line. + * @count: Number of errors detected. + */ +struct bt1_apb { + struct device *dev; + + struct regmap *regs; + void __iomem *res; + int irq; + + unsigned long rate; + struct clk *pclk; + + struct reset_control *prst; + + atomic_t count; +}; + +static const struct regmap_config bt1_apb_regmap_cfg = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = APB_EHB_TIMEOUT, + .fast_io = true +}; + +static inline unsigned long bt1_apb_n_to_timeout_us(struct bt1_apb *apb, u32 n) +{ + u64 timeout = (u64)n * USEC_PER_SEC; + + do_div(timeout, apb->rate); + + return timeout; + +} + +static inline unsigned long bt1_apb_timeout_to_n_us(struct bt1_apb *apb, + unsigned long timeout) +{ + u64 n = (u64)timeout * apb->rate; + + do_div(n, USEC_PER_SEC); + + return n; + +} + +static irqreturn_t bt1_apb_isr(int irq, void *data) +{ + struct bt1_apb *apb = data; + u32 addr = 0; + + regmap_read(apb->regs, APB_EHB_ADDR, &addr); + + dev_crit_ratelimited(apb->dev, + "APB-bus fault %d: Slave access timeout at 0x%08x\n", + atomic_inc_return(&apb->count), + addr); + + /* + * Print backtrace on each CPU. This might be pointless if the fault + * has happened on the same CPU as the IRQ handler is executed or + * the other core proceeded further execution despite the error. + * But if it's not, by looking at the trace we would get straight to + * the cause of the problem. + */ + trigger_all_cpu_backtrace(); + + regmap_update_bits(apb->regs, APB_EHB_ISR, APB_EHB_ISR_PENDING, 0); + + return IRQ_HANDLED; +} + +static void bt1_apb_clear_data(void *data) +{ + struct bt1_apb *apb = data; + struct platform_device *pdev = to_platform_device(apb->dev); + + platform_set_drvdata(pdev, NULL); +} + +static struct bt1_apb *bt1_apb_create_data(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bt1_apb *apb; + int ret; + + apb = devm_kzalloc(dev, sizeof(*apb), GFP_KERNEL); + if (!apb) + return ERR_PTR(-ENOMEM); + + ret = devm_add_action(dev, bt1_apb_clear_data, apb); + if (ret) { + dev_err(dev, "Can't add APB EHB data clear action\n"); + return ERR_PTR(ret); + } + + apb->dev = dev; + atomic_set(&apb->count, 0); + platform_set_drvdata(pdev, apb); + + return apb; +} + +static int bt1_apb_request_regs(struct bt1_apb *apb) +{ + struct platform_device *pdev = to_platform_device(apb->dev); + void __iomem *regs; + + regs = devm_platform_ioremap_resource_byname(pdev, "ehb"); + if (IS_ERR(regs)) { + dev_err(apb->dev, "Couldn't map APB EHB registers\n"); + return PTR_ERR(regs); + } + + apb->regs = devm_regmap_init_mmio(apb->dev, regs, &bt1_apb_regmap_cfg); + if (IS_ERR(apb->regs)) { + dev_err(apb->dev, "Couldn't create APB EHB regmap\n"); + return PTR_ERR(apb->regs); + } + + apb->res = devm_platform_ioremap_resource_byname(pdev, "nodev"); + if (IS_ERR(apb->res)) + dev_err(apb->dev, "Couldn't map reserved region\n"); + + return PTR_ERR_OR_ZERO(apb->res); +} + +static int bt1_apb_request_rst(struct bt1_apb *apb) +{ + int ret; + + apb->prst = devm_reset_control_get_optional_exclusive(apb->dev, "prst"); + if (IS_ERR(apb->prst)) + return dev_err_probe(apb->dev, PTR_ERR(apb->prst), + "Couldn't get reset control line\n"); + + ret = reset_control_deassert(apb->prst); + if (ret) + dev_err(apb->dev, "Failed to deassert the reset line\n"); + + return ret; +} + +static void bt1_apb_disable_clk(void *data) +{ + struct bt1_apb *apb = data; + + clk_disable_unprepare(apb->pclk); +} + +static int bt1_apb_request_clk(struct bt1_apb *apb) +{ + int ret; + + apb->pclk = devm_clk_get(apb->dev, "pclk"); + if (IS_ERR(apb->pclk)) + return dev_err_probe(apb->dev, PTR_ERR(apb->pclk), + "Couldn't get APB clock descriptor\n"); + + ret = clk_prepare_enable(apb->pclk); + if (ret) { + dev_err(apb->dev, "Couldn't enable the APB clock\n"); + return ret; + } + + ret = devm_add_action_or_reset(apb->dev, bt1_apb_disable_clk, apb); + if (ret) { + dev_err(apb->dev, "Can't add APB EHB clocks disable action\n"); + return ret; + } + + apb->rate = clk_get_rate(apb->pclk); + if (!apb->rate) { + dev_err(apb->dev, "Invalid clock rate\n"); + return -EINVAL; + } + + return 0; +} + +static void bt1_apb_clear_irq(void *data) +{ + struct bt1_apb *apb = data; + + regmap_update_bits(apb->regs, APB_EHB_ISR, APB_EHB_ISR_MASK, 0); +} + +static int bt1_apb_request_irq(struct bt1_apb *apb) +{ + struct platform_device *pdev = to_platform_device(apb->dev); + int ret; + + apb->irq = platform_get_irq(pdev, 0); + if (apb->irq < 0) + return apb->irq; + + ret = devm_request_irq(apb->dev, apb->irq, bt1_apb_isr, IRQF_SHARED, + "bt1-apb", apb); + if (ret) { + dev_err(apb->dev, "Couldn't request APB EHB IRQ\n"); + return ret; + } + + ret = devm_add_action(apb->dev, bt1_apb_clear_irq, apb); + if (ret) { + dev_err(apb->dev, "Can't add APB EHB IRQs clear action\n"); + return ret; + } + + /* Unmask IRQ and clear it' pending flag. */ + regmap_update_bits(apb->regs, APB_EHB_ISR, + APB_EHB_ISR_PENDING | APB_EHB_ISR_MASK, + APB_EHB_ISR_MASK); + + return 0; +} + +static ssize_t count_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct bt1_apb *apb = dev_get_drvdata(dev); + + return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&apb->count)); +} +static DEVICE_ATTR_RO(count); + +static ssize_t timeout_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct bt1_apb *apb = dev_get_drvdata(dev); + unsigned long timeout; + int ret; + u32 n; + + ret = regmap_read(apb->regs, APB_EHB_TIMEOUT, &n); + if (ret) + return ret; + + timeout = bt1_apb_n_to_timeout_us(apb, n); + + return scnprintf(buf, PAGE_SIZE, "%lu\n", timeout); +} + +static ssize_t timeout_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct bt1_apb *apb = dev_get_drvdata(dev); + unsigned long timeout; + int ret; + u32 n; + + if (kstrtoul(buf, 0, &timeout) < 0) + return -EINVAL; + + n = bt1_apb_timeout_to_n_us(apb, timeout); + n = clamp(n, APB_EHB_TIMEOUT_MIN, APB_EHB_TIMEOUT_MAX); + + ret = regmap_write(apb->regs, APB_EHB_TIMEOUT, n); + + return ret ?: count; +} +static DEVICE_ATTR_RW(timeout); + +static ssize_t inject_error_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "Error injection: nodev irq\n"); +} + +static ssize_t inject_error_store(struct device *dev, + struct device_attribute *attr, + const char *data, size_t count) +{ + struct bt1_apb *apb = dev_get_drvdata(dev); + + /* + * Either dummy read from the unmapped address in the APB IO area + * or manually set the IRQ status. + */ + if (sysfs_streq(data, "nodev")) + readl(apb->res); + else if (sysfs_streq(data, "irq")) + regmap_update_bits(apb->regs, APB_EHB_ISR, APB_EHB_ISR_PENDING, + APB_EHB_ISR_PENDING); + else + return -EINVAL; + + return count; +} +static DEVICE_ATTR_RW(inject_error); + +static struct attribute *bt1_apb_sysfs_attrs[] = { + &dev_attr_count.attr, + &dev_attr_timeout.attr, + &dev_attr_inject_error.attr, + NULL +}; +ATTRIBUTE_GROUPS(bt1_apb_sysfs); + +static void bt1_apb_remove_sysfs(void *data) +{ + struct bt1_apb *apb = data; + + device_remove_groups(apb->dev, bt1_apb_sysfs_groups); +} + +static int bt1_apb_init_sysfs(struct bt1_apb *apb) +{ + int ret; + + ret = device_add_groups(apb->dev, bt1_apb_sysfs_groups); + if (ret) { + dev_err(apb->dev, "Failed to create EHB APB sysfs nodes\n"); + return ret; + } + + ret = devm_add_action_or_reset(apb->dev, bt1_apb_remove_sysfs, apb); + if (ret) + dev_err(apb->dev, "Can't add APB EHB sysfs remove action\n"); + + return ret; +} + +static int bt1_apb_probe(struct platform_device *pdev) +{ + struct bt1_apb *apb; + int ret; + + apb = bt1_apb_create_data(pdev); + if (IS_ERR(apb)) + return PTR_ERR(apb); + + ret = bt1_apb_request_regs(apb); + if (ret) + return ret; + + ret = bt1_apb_request_rst(apb); + if (ret) + return ret; + + ret = bt1_apb_request_clk(apb); + if (ret) + return ret; + + ret = bt1_apb_request_irq(apb); + if (ret) + return ret; + + ret = bt1_apb_init_sysfs(apb); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id bt1_apb_of_match[] = { + { .compatible = "baikal,bt1-apb" }, + { } +}; +MODULE_DEVICE_TABLE(of, bt1_apb_of_match); + +static struct platform_driver bt1_apb_driver = { + .probe = bt1_apb_probe, + .driver = { + .name = "bt1-apb", + .of_match_table = bt1_apb_of_match + } +}; +module_platform_driver(bt1_apb_driver); + +MODULE_AUTHOR("Serge Semin "); +MODULE_DESCRIPTION("Baikal-T1 APB-bus driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3