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/char/tpm/tpm_tis_i2c.c | 389 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 389 insertions(+) create mode 100644 drivers/char/tpm/tpm_tis_i2c.c (limited to 'drivers/char/tpm/tpm_tis_i2c.c') diff --git a/drivers/char/tpm/tpm_tis_i2c.c b/drivers/char/tpm/tpm_tis_i2c.c new file mode 100644 index 000000000..c8c34adc1 --- /dev/null +++ b/drivers/char/tpm/tpm_tis_i2c.c @@ -0,0 +1,389 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2014-2021 Nuvoton Technology corporation + * Copyright (C) 2019-2022 Infineon Technologies AG + * + * This device driver implements the TPM interface as defined in the TCG PC + * Client Platform TPM Profile (PTP) Specification for TPM 2.0 v1.04 + * Revision 14. + * + * It is based on the tpm_tis_spi device driver. + */ + +#include +#include +#include "tpm_tis_core.h" + +/* TPM registers */ +#define TPM_I2C_LOC_SEL 0x00 +#define TPM_I2C_ACCESS 0x04 +#define TPM_I2C_INTERFACE_CAPABILITY 0x30 +#define TPM_I2C_DEVICE_ADDRESS 0x38 +#define TPM_I2C_DATA_CSUM_ENABLE 0x40 +#define TPM_DATA_CSUM 0x44 +#define TPM_I2C_DID_VID 0x48 +#define TPM_I2C_RID 0x4C + +/* TIS-compatible register address to avoid clash with TPM_ACCESS (0x00) */ +#define TPM_LOC_SEL 0x0FFF + +/* Mask to extract the I2C register from TIS register addresses */ +#define TPM_TIS_REGISTER_MASK 0x0FFF + +/* Default Guard Time of 250µs until interface capability register is read */ +#define GUARD_TIME_DEFAULT_MIN 250 +#define GUARD_TIME_DEFAULT_MAX 300 + +/* Guard Time of 250µs after I2C slave NACK */ +#define GUARD_TIME_ERR_MIN 250 +#define GUARD_TIME_ERR_MAX 300 + +/* Guard Time bit masks; SR is repeated start, RW is read then write, etc. */ +#define TPM_GUARD_TIME_SR_MASK 0x40000000 +#define TPM_GUARD_TIME_RR_MASK 0x00100000 +#define TPM_GUARD_TIME_RW_MASK 0x00080000 +#define TPM_GUARD_TIME_WR_MASK 0x00040000 +#define TPM_GUARD_TIME_WW_MASK 0x00020000 +#define TPM_GUARD_TIME_MIN_MASK 0x0001FE00 +#define TPM_GUARD_TIME_MIN_SHIFT 9 + +/* Masks with bits that must be read zero */ +#define TPM_ACCESS_READ_ZERO 0x48 +#define TPM_INT_ENABLE_ZERO 0x7FFFFF60 +#define TPM_STS_READ_ZERO 0x23 +#define TPM_INTF_CAPABILITY_ZERO 0x0FFFF000 +#define TPM_I2C_INTERFACE_CAPABILITY_ZERO 0x80000000 + +struct tpm_tis_i2c_phy { + struct tpm_tis_data priv; + struct i2c_client *i2c_client; + bool guard_time_read; + bool guard_time_write; + u16 guard_time_min; + u16 guard_time_max; + u8 *io_buf; +}; + +static inline struct tpm_tis_i2c_phy * +to_tpm_tis_i2c_phy(struct tpm_tis_data *data) +{ + return container_of(data, struct tpm_tis_i2c_phy, priv); +} + +/* + * tpm_tis_core uses the register addresses as defined in Table 19 "Allocation + * of Register Space for FIFO TPM Access" of the TCG PC Client PTP + * Specification. In order for this code to work together with tpm_tis_core, + * those addresses need to mapped to the registers defined for I2C TPMs in + * Table 51 "I2C-TPM Register Overview". + * + * For most addresses this can be done by simply stripping off the locality + * information from the address. A few addresses need to be mapped explicitly, + * since the corresponding I2C registers have been moved around. TPM_LOC_SEL is + * only defined for I2C TPMs and is also mapped explicitly here to distinguish + * it from TPM_ACCESS(0). + * + * Locality information is ignored, since this driver assumes exclusive access + * to the TPM and always uses locality 0. + */ +static u8 tpm_tis_i2c_address_to_register(u32 addr) +{ + addr &= TPM_TIS_REGISTER_MASK; + + switch (addr) { + case TPM_ACCESS(0): + return TPM_I2C_ACCESS; + case TPM_LOC_SEL: + return TPM_I2C_LOC_SEL; + case TPM_DID_VID(0): + return TPM_I2C_DID_VID; + case TPM_RID(0): + return TPM_I2C_RID; + default: + return addr; + } +} + +static int tpm_tis_i2c_retry_transfer_until_ack(struct tpm_tis_data *data, + struct i2c_msg *msg) +{ + struct tpm_tis_i2c_phy *phy = to_tpm_tis_i2c_phy(data); + bool guard_time; + int i = 0; + int ret; + + if (msg->flags & I2C_M_RD) + guard_time = phy->guard_time_read; + else + guard_time = phy->guard_time_write; + + do { + ret = i2c_transfer(phy->i2c_client->adapter, msg, 1); + if (ret < 0) + usleep_range(GUARD_TIME_ERR_MIN, GUARD_TIME_ERR_MAX); + else if (guard_time) + usleep_range(phy->guard_time_min, phy->guard_time_max); + /* retry on TPM NACK */ + } while (ret < 0 && i++ < TPM_RETRY); + + return ret; +} + +/* Check that bits which must be read zero are not set */ +static int tpm_tis_i2c_sanity_check_read(u8 reg, u16 len, u8 *buf) +{ + u32 zero_mask; + u32 value; + + switch (len) { + case sizeof(u8): + value = buf[0]; + break; + case sizeof(u16): + value = le16_to_cpup((__le16 *)buf); + break; + case sizeof(u32): + value = le32_to_cpup((__le32 *)buf); + break; + default: + /* unknown length, skip check */ + return 0; + } + + switch (reg) { + case TPM_I2C_ACCESS: + zero_mask = TPM_ACCESS_READ_ZERO; + break; + case TPM_INT_ENABLE(0) & TPM_TIS_REGISTER_MASK: + zero_mask = TPM_INT_ENABLE_ZERO; + break; + case TPM_STS(0) & TPM_TIS_REGISTER_MASK: + zero_mask = TPM_STS_READ_ZERO; + break; + case TPM_INTF_CAPS(0) & TPM_TIS_REGISTER_MASK: + zero_mask = TPM_INTF_CAPABILITY_ZERO; + break; + case TPM_I2C_INTERFACE_CAPABILITY: + zero_mask = TPM_I2C_INTERFACE_CAPABILITY_ZERO; + break; + default: + /* unknown register, skip check */ + return 0; + } + + if (unlikely((value & zero_mask) != 0x00)) { + pr_debug("TPM I2C read of register 0x%02x failed sanity check: 0x%x\n", reg, value); + return -EIO; + } + + return 0; +} + +static int tpm_tis_i2c_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, + u8 *result, enum tpm_tis_io_mode io_mode) +{ + struct tpm_tis_i2c_phy *phy = to_tpm_tis_i2c_phy(data); + struct i2c_msg msg = { .addr = phy->i2c_client->addr }; + u8 reg = tpm_tis_i2c_address_to_register(addr); + int i; + int ret; + + for (i = 0; i < TPM_RETRY; i++) { + /* write register */ + msg.len = sizeof(reg); + msg.buf = ® + msg.flags = 0; + ret = tpm_tis_i2c_retry_transfer_until_ack(data, &msg); + if (ret < 0) + return ret; + + /* read data */ + msg.buf = result; + msg.len = len; + msg.flags = I2C_M_RD; + ret = tpm_tis_i2c_retry_transfer_until_ack(data, &msg); + if (ret < 0) + return ret; + + ret = tpm_tis_i2c_sanity_check_read(reg, len, result); + if (ret == 0) + return 0; + + usleep_range(GUARD_TIME_ERR_MIN, GUARD_TIME_ERR_MAX); + } + + return ret; +} + +static int tpm_tis_i2c_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, + const u8 *value, + enum tpm_tis_io_mode io_mode) +{ + struct tpm_tis_i2c_phy *phy = to_tpm_tis_i2c_phy(data); + struct i2c_msg msg = { .addr = phy->i2c_client->addr }; + u8 reg = tpm_tis_i2c_address_to_register(addr); + int ret; + + if (len > TPM_BUFSIZE - 1) + return -EIO; + + /* write register and data in one go */ + phy->io_buf[0] = reg; + memcpy(phy->io_buf + sizeof(reg), value, len); + + msg.len = sizeof(reg) + len; + msg.buf = phy->io_buf; + ret = tpm_tis_i2c_retry_transfer_until_ack(data, &msg); + if (ret < 0) + return ret; + + return 0; +} + +static int tpm_tis_i2c_verify_crc(struct tpm_tis_data *data, size_t len, + const u8 *value) +{ + u16 crc_tpm, crc_host; + int rc; + + rc = tpm_tis_read16(data, TPM_DATA_CSUM, &crc_tpm); + if (rc < 0) + return rc; + + /* reflect crc result, regardless of host endianness */ + crc_host = swab16(crc_ccitt(0, value, len)); + if (crc_tpm != crc_host) + return -EIO; + + return 0; +} + +/* + * Guard Time: + * After each I2C operation, the TPM might require the master to wait. + * The time period is vendor-specific and must be read from the + * TPM_I2C_INTERFACE_CAPABILITY register. + * + * Before the Guard Time is read (or after the TPM failed to send an I2C NACK), + * a Guard Time of 250µs applies. + * + * Various flags in the same register indicate if a guard time is needed: + * - SR: + * - RR: + * - RW: + * - WR: + * - WW: + * + * See TCG PC Client PTP Specification v1.04, 8.1.10 GUARD_TIME + */ +static int tpm_tis_i2c_init_guard_time(struct tpm_tis_i2c_phy *phy) +{ + u32 i2c_caps; + int ret; + + phy->guard_time_read = true; + phy->guard_time_write = true; + phy->guard_time_min = GUARD_TIME_DEFAULT_MIN; + phy->guard_time_max = GUARD_TIME_DEFAULT_MAX; + + ret = tpm_tis_i2c_read_bytes(&phy->priv, TPM_I2C_INTERFACE_CAPABILITY, + sizeof(i2c_caps), (u8 *)&i2c_caps, + TPM_TIS_PHYS_32); + if (ret) + return ret; + + phy->guard_time_read = (i2c_caps & TPM_GUARD_TIME_RR_MASK) || + (i2c_caps & TPM_GUARD_TIME_RW_MASK); + phy->guard_time_write = (i2c_caps & TPM_GUARD_TIME_WR_MASK) || + (i2c_caps & TPM_GUARD_TIME_WW_MASK); + phy->guard_time_min = (i2c_caps & TPM_GUARD_TIME_MIN_MASK) >> + TPM_GUARD_TIME_MIN_SHIFT; + /* guard_time_max = guard_time_min * 1.2 */ + phy->guard_time_max = phy->guard_time_min + phy->guard_time_min / 5; + + return 0; +} + +static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume); + +static const struct tpm_tis_phy_ops tpm_i2c_phy_ops = { + .read_bytes = tpm_tis_i2c_read_bytes, + .write_bytes = tpm_tis_i2c_write_bytes, + .verify_crc = tpm_tis_i2c_verify_crc, +}; + +static int tpm_tis_i2c_probe(struct i2c_client *dev) +{ + struct tpm_tis_i2c_phy *phy; + const u8 crc_enable = 1; + const u8 locality = 0; + int ret; + + phy = devm_kzalloc(&dev->dev, sizeof(struct tpm_tis_i2c_phy), + GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->io_buf = devm_kzalloc(&dev->dev, TPM_BUFSIZE, GFP_KERNEL); + if (!phy->io_buf) + return -ENOMEM; + + set_bit(TPM_TIS_DEFAULT_CANCELLATION, &phy->priv.flags); + phy->i2c_client = dev; + + /* must precede all communication with the tpm */ + ret = tpm_tis_i2c_init_guard_time(phy); + if (ret) + return ret; + + ret = tpm_tis_i2c_write_bytes(&phy->priv, TPM_LOC_SEL, sizeof(locality), + &locality, TPM_TIS_PHYS_8); + if (ret) + return ret; + + ret = tpm_tis_i2c_write_bytes(&phy->priv, TPM_I2C_DATA_CSUM_ENABLE, + sizeof(crc_enable), &crc_enable, + TPM_TIS_PHYS_8); + if (ret) + return ret; + + return tpm_tis_core_init(&dev->dev, &phy->priv, -1, &tpm_i2c_phy_ops, + NULL); +} + +static void tpm_tis_i2c_remove(struct i2c_client *client) +{ + struct tpm_chip *chip = i2c_get_clientdata(client); + + tpm_chip_unregister(chip); + tpm_tis_remove(chip); +} + +static const struct i2c_device_id tpm_tis_i2c_id[] = { + { "tpm_tis_i2c", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, tpm_tis_i2c_id); + +#ifdef CONFIG_OF +static const struct of_device_id of_tis_i2c_match[] = { + { .compatible = "infineon,slb9673", }, + {} +}; +MODULE_DEVICE_TABLE(of, of_tis_i2c_match); +#endif + +static struct i2c_driver tpm_tis_i2c_driver = { + .driver = { + .name = "tpm_tis_i2c", + .pm = &tpm_tis_pm, + .of_match_table = of_match_ptr(of_tis_i2c_match), + }, + .probe_new = tpm_tis_i2c_probe, + .remove = tpm_tis_i2c_remove, + .id_table = tpm_tis_i2c_id, +}; +module_i2c_driver(tpm_tis_i2c_driver); + +MODULE_DESCRIPTION("TPM Driver for native I2C access"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3