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_i2c.c | 383 ++++++++++++++++++++++++++++++++++ 1 file changed, 383 insertions(+) create mode 100644 drivers/platform/chrome/cros_ec_i2c.c (limited to 'drivers/platform/chrome/cros_ec_i2c.c') diff --git a/drivers/platform/chrome/cros_ec_i2c.c b/drivers/platform/chrome/cros_ec_i2c.c new file mode 100644 index 000000000..dbe698f33 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_i2c.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0 +// I2C interface for ChromeOS Embedded Controller +// +// Copyright (C) 2012 Google, Inc + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "cros_ec.h" + +/* + * Request format for protocol v3 + * byte 0 0xda (EC_COMMAND_PROTOCOL_3) + * byte 1-8 struct ec_host_request + * byte 10- response data + */ +struct ec_host_request_i2c { + /* Always 0xda to backward compatible with v2 struct */ + uint8_t command_protocol; + struct ec_host_request ec_request; +} __packed; + + +/* + * Response format for protocol v3 + * byte 0 result code + * byte 1 packet_length + * byte 2-9 struct ec_host_response + * byte 10- response data + */ +struct ec_host_response_i2c { + uint8_t result; + uint8_t packet_length; + struct ec_host_response ec_response; +} __packed; + +static inline struct cros_ec_device *to_ec_dev(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + + return i2c_get_clientdata(client); +} + +static int cros_ec_pkt_xfer_i2c(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + struct i2c_client *client = ec_dev->priv; + int ret = -ENOMEM; + int i; + int packet_len; + u8 *out_buf = NULL; + u8 *in_buf = NULL; + u8 sum; + struct i2c_msg i2c_msg[2]; + struct ec_host_response *ec_response; + struct ec_host_request_i2c *ec_request_i2c; + struct ec_host_response_i2c *ec_response_i2c; + int request_header_size = sizeof(struct ec_host_request_i2c); + int response_header_size = sizeof(struct ec_host_response_i2c); + + i2c_msg[0].addr = client->addr; + i2c_msg[0].flags = 0; + i2c_msg[1].addr = client->addr; + i2c_msg[1].flags = I2C_M_RD; + + packet_len = msg->insize + response_header_size; + if (packet_len > ec_dev->din_size) { + ret = -EINVAL; + goto done; + } + in_buf = ec_dev->din; + i2c_msg[1].len = packet_len; + i2c_msg[1].buf = (char *) in_buf; + + packet_len = msg->outsize + request_header_size; + if (packet_len > ec_dev->dout_size) { + ret = -EINVAL; + goto done; + } + out_buf = ec_dev->dout; + i2c_msg[0].len = packet_len; + i2c_msg[0].buf = (char *) out_buf; + + /* create request data */ + ec_request_i2c = (struct ec_host_request_i2c *) out_buf; + ec_request_i2c->command_protocol = EC_COMMAND_PROTOCOL_3; + + ec_dev->dout++; + ret = cros_ec_prepare_tx(ec_dev, msg); + if (ret < 0) + goto done; + ec_dev->dout--; + + /* send command to EC and read answer */ + ret = i2c_transfer(client->adapter, i2c_msg, 2); + if (ret < 0) { + dev_dbg(ec_dev->dev, "i2c transfer failed: %d\n", ret); + goto done; + } else if (ret != 2) { + dev_err(ec_dev->dev, "failed to get response: %d\n", ret); + ret = -EIO; + goto done; + } + + ec_response_i2c = (struct ec_host_response_i2c *) in_buf; + msg->result = ec_response_i2c->result; + ec_response = &ec_response_i2c->ec_response; + + switch (msg->result) { + case EC_RES_SUCCESS: + break; + case EC_RES_IN_PROGRESS: + ret = -EAGAIN; + dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", + msg->command); + goto done; + + default: + dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", + msg->command, msg->result); + /* + * When we send v3 request to v2 ec, ec won't recognize the + * 0xda (EC_COMMAND_PROTOCOL_3) and will return with status + * EC_RES_INVALID_COMMAND with zero data length. + * + * In case of invalid command for v3 protocol the data length + * will be at least sizeof(struct ec_host_response) + */ + if (ec_response_i2c->result == EC_RES_INVALID_COMMAND && + ec_response_i2c->packet_length == 0) { + ret = -EPROTONOSUPPORT; + goto done; + } + } + + if (ec_response_i2c->packet_length < sizeof(struct ec_host_response)) { + dev_err(ec_dev->dev, + "response of %u bytes too short; not a full header\n", + ec_response_i2c->packet_length); + ret = -EBADMSG; + goto done; + } + + if (msg->insize < ec_response->data_len) { + dev_err(ec_dev->dev, + "response data size is too large: expected %u, got %u\n", + msg->insize, + ec_response->data_len); + ret = -EMSGSIZE; + goto done; + } + + /* copy response packet payload and compute checksum */ + sum = 0; + for (i = 0; i < sizeof(struct ec_host_response); i++) + sum += ((u8 *)ec_response)[i]; + + memcpy(msg->data, + in_buf + response_header_size, + ec_response->data_len); + for (i = 0; i < ec_response->data_len; i++) + sum += msg->data[i]; + + /* All bytes should sum to zero */ + if (sum) { + dev_err(ec_dev->dev, "bad packet checksum\n"); + ret = -EBADMSG; + goto done; + } + + ret = ec_response->data_len; + +done: + if (msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + struct i2c_client *client = ec_dev->priv; + int ret = -ENOMEM; + int i; + int len; + int packet_len; + u8 *out_buf = NULL; + u8 *in_buf = NULL; + u8 sum; + struct i2c_msg i2c_msg[2]; + + i2c_msg[0].addr = client->addr; + i2c_msg[0].flags = 0; + i2c_msg[1].addr = client->addr; + i2c_msg[1].flags = I2C_M_RD; + + /* + * allocate larger packet (one byte for checksum, one byte for + * length, and one for result code) + */ + packet_len = msg->insize + 3; + in_buf = kzalloc(packet_len, GFP_KERNEL); + if (!in_buf) + goto done; + i2c_msg[1].len = packet_len; + i2c_msg[1].buf = (char *)in_buf; + + /* + * allocate larger packet (one byte for checksum, one for + * command code, one for length, and one for command version) + */ + packet_len = msg->outsize + 4; + out_buf = kzalloc(packet_len, GFP_KERNEL); + if (!out_buf) + goto done; + i2c_msg[0].len = packet_len; + i2c_msg[0].buf = (char *)out_buf; + + out_buf[0] = EC_CMD_VERSION0 + msg->version; + out_buf[1] = msg->command; + out_buf[2] = msg->outsize; + + /* copy message payload and compute checksum */ + sum = out_buf[0] + out_buf[1] + out_buf[2]; + for (i = 0; i < msg->outsize; i++) { + out_buf[3 + i] = msg->data[i]; + sum += out_buf[3 + i]; + } + out_buf[3 + msg->outsize] = sum; + + /* send command to EC and read answer */ + ret = i2c_transfer(client->adapter, i2c_msg, 2); + if (ret < 0) { + dev_err(ec_dev->dev, "i2c transfer failed: %d\n", ret); + goto done; + } else if (ret != 2) { + dev_err(ec_dev->dev, "failed to get response: %d\n", ret); + ret = -EIO; + goto done; + } + + /* check response error code */ + msg->result = i2c_msg[1].buf[0]; + ret = cros_ec_check_result(ec_dev, msg); + if (ret) + goto done; + + len = in_buf[1]; + if (len > msg->insize) { + dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", + len, msg->insize); + ret = -ENOSPC; + goto done; + } + + /* copy response packet payload and compute checksum */ + sum = in_buf[0] + in_buf[1]; + for (i = 0; i < len; i++) { + msg->data[i] = in_buf[2 + i]; + sum += in_buf[2 + i]; + } + dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n", + i2c_msg[1].len, in_buf, sum); + if (sum != in_buf[2 + len]) { + dev_err(ec_dev->dev, "bad packet checksum\n"); + ret = -EBADMSG; + goto done; + } + + ret = len; +done: + kfree(in_buf); + kfree(out_buf); + if (msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +static int cros_ec_i2c_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct cros_ec_device *ec_dev = NULL; + int err; + + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); + if (!ec_dev) + return -ENOMEM; + + i2c_set_clientdata(client, ec_dev); + ec_dev->dev = dev; + ec_dev->priv = client; + ec_dev->irq = client->irq; + ec_dev->cmd_xfer = cros_ec_cmd_xfer_i2c; + ec_dev->pkt_xfer = cros_ec_pkt_xfer_i2c; + ec_dev->phys_name = client->adapter->name; + ec_dev->din_size = sizeof(struct ec_host_response_i2c) + + sizeof(struct ec_response_get_protocol_info); + ec_dev->dout_size = sizeof(struct ec_host_request_i2c); + + err = cros_ec_register(ec_dev); + if (err) { + dev_err(dev, "cannot register EC\n"); + return err; + } + + return 0; +} + +static void cros_ec_i2c_remove(struct i2c_client *client) +{ + struct cros_ec_device *ec_dev = i2c_get_clientdata(client); + + cros_ec_unregister(ec_dev); +} + +#ifdef CONFIG_PM_SLEEP +static int cros_ec_i2c_suspend(struct device *dev) +{ + struct cros_ec_device *ec_dev = to_ec_dev(dev); + + return cros_ec_suspend(ec_dev); +} + +static int cros_ec_i2c_resume(struct device *dev) +{ + struct cros_ec_device *ec_dev = to_ec_dev(dev); + + return cros_ec_resume(ec_dev); +} +#endif + +static const struct dev_pm_ops cros_ec_i2c_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_i2c_suspend, cros_ec_i2c_resume) +}; + +#ifdef CONFIG_OF +static const struct of_device_id cros_ec_i2c_of_match[] = { + { .compatible = "google,cros-ec-i2c", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, cros_ec_i2c_of_match); +#endif + +static const struct i2c_device_id cros_ec_i2c_id[] = { + { "cros-ec-i2c", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, cros_ec_i2c_id); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id cros_ec_i2c_acpi_id[] = { + { "GOOG0008", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(acpi, cros_ec_i2c_acpi_id); +#endif + +static struct i2c_driver cros_ec_driver = { + .driver = { + .name = "cros-ec-i2c", + .acpi_match_table = ACPI_PTR(cros_ec_i2c_acpi_id), + .of_match_table = of_match_ptr(cros_ec_i2c_of_match), + .pm = &cros_ec_i2c_pm_ops, + }, + .probe_new = cros_ec_i2c_probe, + .remove = cros_ec_i2c_remove, + .id_table = cros_ec_i2c_id, +}; + +module_i2c_driver(cros_ec_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("I2C interface for ChromeOS Embedded Controller"); -- cgit v1.2.3