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/platform/chrome/cros_ec_uart.c | 362 +++++++++++++++++++++++++++++++++ 1 file changed, 362 insertions(+) create mode 100644 drivers/platform/chrome/cros_ec_uart.c (limited to 'drivers/platform/chrome/cros_ec_uart.c') diff --git a/drivers/platform/chrome/cros_ec_uart.c b/drivers/platform/chrome/cros_ec_uart.c new file mode 100644 index 000000000..788246559 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_uart.c @@ -0,0 +1,362 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * UART interface for ChromeOS Embedded Controller + * + * Copyright 2020-2022 Google LLC. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cros_ec.h" + +/* + * EC sends contiguous bytes of response packet on UART AP RX. + * TTY driver in AP accumulates incoming bytes and calls the registered callback + * function. Byte count can range from 1 to MAX bytes supported by EC. + * This driver should wait for long time for all callbacks to be processed. + * Considering the worst case scenario, wait for 500 msec. This timeout should + * account for max latency and some additional guard time. + * Best case: Entire packet is received in ~200 ms, wait queue will be released + * and packet will be processed. + * Worst case: TTY driver sends bytes in multiple callbacks. In this case this + * driver will wait for ~1 sec beyond which it will timeout. + * This timeout value should not exceed ~500 msec because in case if + * EC_CMD_REBOOT_EC sent, high level driver should be able to intercept EC + * in RO. + */ +#define EC_MSG_DEADLINE_MS 500 + +/** + * struct response_info - Encapsulate EC response related + * information for passing between function + * cros_ec_uart_pkt_xfer() and cros_ec_uart_rx_bytes() + * callback. + * @data: Copy the data received from EC here. + * @max_size: Max size allocated for the @data buffer. If the + * received data exceeds this value, we log an error. + * @size: Actual size of data received from EC. This is also + * used to accumulate byte count with response is received + * in dma chunks. + * @exp_len: Expected bytes of response from EC including header. + * @status: Re-init to 0 before sending a cmd. Updated to 1 when + * a response is successfully received, or an error number + * on failure. + * @wait_queue: Wait queue EC response where the cros_ec sends request + * to EC and waits + */ +struct response_info { + void *data; + size_t max_size; + size_t size; + size_t exp_len; + int status; + wait_queue_head_t wait_queue; +}; + +/** + * struct cros_ec_uart - information about a uart-connected EC + * + * @serdev: serdev uart device we are connected to. + * @baudrate: UART baudrate of attached EC device. + * @flowcontrol: UART flowcontrol of attached device. + * @irq: Linux IRQ number of associated serial device. + * @response: Response info passing between cros_ec_uart_pkt_xfer() + * and cros_ec_uart_rx_bytes() + */ +struct cros_ec_uart { + struct serdev_device *serdev; + u32 baudrate; + u8 flowcontrol; + u32 irq; + struct response_info response; +}; + +static int cros_ec_uart_rx_bytes(struct serdev_device *serdev, + const u8 *data, + size_t count) +{ + struct ec_host_response *host_response; + struct cros_ec_device *ec_dev = serdev_device_get_drvdata(serdev); + struct cros_ec_uart *ec_uart = ec_dev->priv; + struct response_info *resp = &ec_uart->response; + + /* Check if bytes were sent out of band */ + if (!resp->data) { + /* Discard all bytes */ + dev_warn(ec_dev->dev, "Bytes received out of band, dropping them.\n"); + return count; + } + + /* + * Check if incoming bytes + resp->size is greater than allocated + * buffer in din by cros_ec. This will ensure that if EC sends more + * bytes than max_size, waiting process will be notified with an error. + */ + if (resp->size + count > resp->max_size) { + resp->status = -EMSGSIZE; + wake_up(&resp->wait_queue); + return count; + } + + memcpy(resp->data + resp->size, data, count); + + resp->size += count; + + /* Read data_len if we received response header and if exp_len was not read before. */ + if (resp->size >= sizeof(*host_response) && resp->exp_len == 0) { + host_response = (struct ec_host_response *)resp->data; + resp->exp_len = host_response->data_len + sizeof(*host_response); + } + + /* If driver received response header and payload from EC, wake up the wait queue. */ + if (resp->size >= sizeof(*host_response) && resp->size == resp->exp_len) { + resp->status = 1; + wake_up(&resp->wait_queue); + } + + return count; +} + +static int cros_ec_uart_pkt_xfer(struct cros_ec_device *ec_dev, + struct cros_ec_command *ec_msg) +{ + struct cros_ec_uart *ec_uart = ec_dev->priv; + struct serdev_device *serdev = ec_uart->serdev; + struct response_info *resp = &ec_uart->response; + struct ec_host_response *host_response; + unsigned int len; + int ret, i; + u8 sum; + + len = cros_ec_prepare_tx(ec_dev, ec_msg); + dev_dbg(ec_dev->dev, "Prepared len=%d\n", len); + + /* Setup for incoming response */ + resp->data = ec_dev->din; + resp->max_size = ec_dev->din_size; + resp->size = 0; + resp->exp_len = 0; + resp->status = 0; + + ret = serdev_device_write_buf(serdev, ec_dev->dout, len); + if (ret < 0 || ret < len) { + dev_err(ec_dev->dev, "Unable to write data\n"); + if (ret >= 0) + ret = -EIO; + goto exit; + } + + ret = wait_event_timeout(resp->wait_queue, resp->status, + msecs_to_jiffies(EC_MSG_DEADLINE_MS)); + if (ret == 0) { + dev_warn(ec_dev->dev, "Timed out waiting for response.\n"); + ret = -ETIMEDOUT; + goto exit; + } + + if (resp->status < 0) { + ret = resp->status; + dev_warn(ec_dev->dev, "Error response received: %d\n", ret); + goto exit; + } + + host_response = (struct ec_host_response *)ec_dev->din; + ec_msg->result = host_response->result; + + if (host_response->data_len > ec_msg->insize) { + dev_err(ec_dev->dev, "Resp too long (%d bytes, expected %d)\n", + host_response->data_len, ec_msg->insize); + ret = -ENOSPC; + goto exit; + } + + /* Validate checksum */ + sum = 0; + for (i = 0; i < sizeof(*host_response) + host_response->data_len; i++) + sum += ec_dev->din[i]; + + if (sum) { + dev_err(ec_dev->dev, "Bad packet checksum calculated %x\n", sum); + ret = -EBADMSG; + goto exit; + } + + memcpy(ec_msg->data, ec_dev->din + sizeof(*host_response), host_response->data_len); + + ret = host_response->data_len; + +exit: + /* Invalidate response buffer to guard against out of band rx data */ + resp->data = NULL; + + if (ec_msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +static int cros_ec_uart_resource(struct acpi_resource *ares, void *data) +{ + struct cros_ec_uart *ec_uart = data; + struct acpi_resource_uart_serialbus *sb = &ares->data.uart_serial_bus; + + if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS && + sb->type == ACPI_RESOURCE_SERIAL_TYPE_UART) { + ec_uart->baudrate = sb->default_baud_rate; + dev_dbg(&ec_uart->serdev->dev, "Baudrate %d\n", ec_uart->baudrate); + + ec_uart->flowcontrol = sb->flow_control; + dev_dbg(&ec_uart->serdev->dev, "Flow control %d\n", ec_uart->flowcontrol); + } + + return 0; +} + +static int cros_ec_uart_acpi_probe(struct cros_ec_uart *ec_uart) +{ + int ret; + LIST_HEAD(resources); + struct acpi_device *adev = ACPI_COMPANION(&ec_uart->serdev->dev); + + ret = acpi_dev_get_resources(adev, &resources, cros_ec_uart_resource, ec_uart); + if (ret < 0) + return ret; + + acpi_dev_free_resource_list(&resources); + + /* Retrieve GpioInt and translate it to Linux IRQ number */ + ret = acpi_dev_gpio_irq_get(adev, 0); + if (ret < 0) + return ret; + + ec_uart->irq = ret; + dev_dbg(&ec_uart->serdev->dev, "IRQ number %d\n", ec_uart->irq); + + return 0; +} + +static const struct serdev_device_ops cros_ec_uart_client_ops = { + .receive_buf = cros_ec_uart_rx_bytes, +}; + +static int cros_ec_uart_probe(struct serdev_device *serdev) +{ + struct device *dev = &serdev->dev; + struct cros_ec_device *ec_dev; + struct cros_ec_uart *ec_uart; + int ret; + + ec_uart = devm_kzalloc(dev, sizeof(*ec_uart), GFP_KERNEL); + if (!ec_uart) + return -ENOMEM; + + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); + if (!ec_dev) + return -ENOMEM; + + ret = devm_serdev_device_open(dev, serdev); + if (ret) { + dev_err(dev, "Unable to open UART device"); + return ret; + } + + serdev_device_set_drvdata(serdev, ec_dev); + init_waitqueue_head(&ec_uart->response.wait_queue); + + ec_uart->serdev = serdev; + + ret = cros_ec_uart_acpi_probe(ec_uart); + if (ret < 0) { + dev_err(dev, "Failed to get ACPI info (%d)", ret); + return ret; + } + + ret = serdev_device_set_baudrate(serdev, ec_uart->baudrate); + if (ret < 0) { + dev_err(dev, "Failed to set up host baud rate (%d)", ret); + return ret; + } + + serdev_device_set_flow_control(serdev, ec_uart->flowcontrol); + + /* Initialize ec_dev for cros_ec */ + ec_dev->phys_name = dev_name(dev); + ec_dev->dev = dev; + ec_dev->priv = ec_uart; + ec_dev->irq = ec_uart->irq; + ec_dev->cmd_xfer = NULL; + ec_dev->pkt_xfer = cros_ec_uart_pkt_xfer; + ec_dev->din_size = sizeof(struct ec_host_response) + + sizeof(struct ec_response_get_protocol_info); + ec_dev->dout_size = sizeof(struct ec_host_request); + + serdev_device_set_client_ops(serdev, &cros_ec_uart_client_ops); + + return cros_ec_register(ec_dev); +} + +static void cros_ec_uart_remove(struct serdev_device *serdev) +{ + struct cros_ec_device *ec_dev = serdev_device_get_drvdata(serdev); + + cros_ec_unregister(ec_dev); +}; + +static int __maybe_unused cros_ec_uart_suspend(struct device *dev) +{ + struct cros_ec_device *ec_dev = dev_get_drvdata(dev); + + return cros_ec_suspend(ec_dev); +} + +static int __maybe_unused cros_ec_uart_resume(struct device *dev) +{ + struct cros_ec_device *ec_dev = dev_get_drvdata(dev); + + return cros_ec_resume(ec_dev); +} + +static SIMPLE_DEV_PM_OPS(cros_ec_uart_pm_ops, cros_ec_uart_suspend, + cros_ec_uart_resume); + +static const struct of_device_id cros_ec_uart_of_match[] = { + { .compatible = "google,cros-ec-uart" }, + {} +}; +MODULE_DEVICE_TABLE(of, cros_ec_uart_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id cros_ec_uart_acpi_id[] = { + { "GOOG0019", 0 }, + {} +}; + +MODULE_DEVICE_TABLE(acpi, cros_ec_uart_acpi_id); +#endif + +static struct serdev_device_driver cros_ec_uart_driver = { + .driver = { + .name = "cros-ec-uart", + .acpi_match_table = ACPI_PTR(cros_ec_uart_acpi_id), + .of_match_table = cros_ec_uart_of_match, + .pm = &cros_ec_uart_pm_ops, + }, + .probe = cros_ec_uart_probe, + .remove = cros_ec_uart_remove, +}; + +module_serdev_device_driver(cros_ec_uart_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("UART interface for ChromeOS Embedded Controller"); +MODULE_AUTHOR("Bhanu Prakash Maiya "); -- cgit v1.2.3