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/greybus/connection.c | 939 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 939 insertions(+) create mode 100644 drivers/greybus/connection.c (limited to 'drivers/greybus/connection.c') diff --git a/drivers/greybus/connection.c b/drivers/greybus/connection.c new file mode 100644 index 000000000..e3799a53a --- /dev/null +++ b/drivers/greybus/connection.c @@ -0,0 +1,939 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Greybus connections + * + * Copyright 2014 Google Inc. + * Copyright 2014 Linaro Ltd. + */ + +#include +#include + +#include "greybus_trace.h" + +#define GB_CONNECTION_CPORT_QUIESCE_TIMEOUT 1000 + +static void gb_connection_kref_release(struct kref *kref); + +static DEFINE_SPINLOCK(gb_connections_lock); +static DEFINE_MUTEX(gb_connection_mutex); + +/* Caller holds gb_connection_mutex. */ +static bool gb_connection_cport_in_use(struct gb_interface *intf, u16 cport_id) +{ + struct gb_host_device *hd = intf->hd; + struct gb_connection *connection; + + list_for_each_entry(connection, &hd->connections, hd_links) { + if (connection->intf == intf && + connection->intf_cport_id == cport_id) + return true; + } + + return false; +} + +static void gb_connection_get(struct gb_connection *connection) +{ + kref_get(&connection->kref); + + trace_gb_connection_get(connection); +} + +static void gb_connection_put(struct gb_connection *connection) +{ + trace_gb_connection_put(connection); + + kref_put(&connection->kref, gb_connection_kref_release); +} + +/* + * Returns a reference-counted pointer to the connection if found. + */ +static struct gb_connection * +gb_connection_hd_find(struct gb_host_device *hd, u16 cport_id) +{ + struct gb_connection *connection; + unsigned long flags; + + spin_lock_irqsave(&gb_connections_lock, flags); + list_for_each_entry(connection, &hd->connections, hd_links) + if (connection->hd_cport_id == cport_id) { + gb_connection_get(connection); + goto found; + } + connection = NULL; +found: + spin_unlock_irqrestore(&gb_connections_lock, flags); + + return connection; +} + +/* + * Callback from the host driver to let us know that data has been + * received on the bundle. + */ +void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id, + u8 *data, size_t length) +{ + struct gb_connection *connection; + + trace_gb_hd_in(hd); + + connection = gb_connection_hd_find(hd, cport_id); + if (!connection) { + dev_err(&hd->dev, + "nonexistent connection (%zu bytes dropped)\n", length); + return; + } + gb_connection_recv(connection, data, length); + gb_connection_put(connection); +} +EXPORT_SYMBOL_GPL(greybus_data_rcvd); + +static void gb_connection_kref_release(struct kref *kref) +{ + struct gb_connection *connection; + + connection = container_of(kref, struct gb_connection, kref); + + trace_gb_connection_release(connection); + + kfree(connection); +} + +static void gb_connection_init_name(struct gb_connection *connection) +{ + u16 hd_cport_id = connection->hd_cport_id; + u16 cport_id = 0; + u8 intf_id = 0; + + if (connection->intf) { + intf_id = connection->intf->interface_id; + cport_id = connection->intf_cport_id; + } + + snprintf(connection->name, sizeof(connection->name), + "%u/%u:%u", hd_cport_id, intf_id, cport_id); +} + +/* + * _gb_connection_create() - create a Greybus connection + * @hd: host device of the connection + * @hd_cport_id: host-device cport id, or -1 for dynamic allocation + * @intf: remote interface, or NULL for static connections + * @bundle: remote-interface bundle (may be NULL) + * @cport_id: remote-interface cport id, or 0 for static connections + * @handler: request handler (may be NULL) + * @flags: connection flags + * + * Create a Greybus connection, representing the bidirectional link + * between a CPort on a (local) Greybus host device and a CPort on + * another Greybus interface. + * + * A connection also maintains the state of operations sent over the + * connection. + * + * Serialised against concurrent create and destroy using the + * gb_connection_mutex. + * + * Return: A pointer to the new connection if successful, or an ERR_PTR + * otherwise. + */ +static struct gb_connection * +_gb_connection_create(struct gb_host_device *hd, int hd_cport_id, + struct gb_interface *intf, + struct gb_bundle *bundle, int cport_id, + gb_request_handler_t handler, + unsigned long flags) +{ + struct gb_connection *connection; + int ret; + + mutex_lock(&gb_connection_mutex); + + if (intf && gb_connection_cport_in_use(intf, cport_id)) { + dev_err(&intf->dev, "cport %u already in use\n", cport_id); + ret = -EBUSY; + goto err_unlock; + } + + ret = gb_hd_cport_allocate(hd, hd_cport_id, flags); + if (ret < 0) { + dev_err(&hd->dev, "failed to allocate cport: %d\n", ret); + goto err_unlock; + } + hd_cport_id = ret; + + connection = kzalloc(sizeof(*connection), GFP_KERNEL); + if (!connection) { + ret = -ENOMEM; + goto err_hd_cport_release; + } + + connection->hd_cport_id = hd_cport_id; + connection->intf_cport_id = cport_id; + connection->hd = hd; + connection->intf = intf; + connection->bundle = bundle; + connection->handler = handler; + connection->flags = flags; + if (intf && (intf->quirks & GB_INTERFACE_QUIRK_NO_CPORT_FEATURES)) + connection->flags |= GB_CONNECTION_FLAG_NO_FLOWCTRL; + connection->state = GB_CONNECTION_STATE_DISABLED; + + atomic_set(&connection->op_cycle, 0); + mutex_init(&connection->mutex); + spin_lock_init(&connection->lock); + INIT_LIST_HEAD(&connection->operations); + + connection->wq = alloc_workqueue("%s:%d", WQ_UNBOUND, 1, + dev_name(&hd->dev), hd_cport_id); + if (!connection->wq) { + ret = -ENOMEM; + goto err_free_connection; + } + + kref_init(&connection->kref); + + gb_connection_init_name(connection); + + spin_lock_irq(&gb_connections_lock); + list_add(&connection->hd_links, &hd->connections); + + if (bundle) + list_add(&connection->bundle_links, &bundle->connections); + else + INIT_LIST_HEAD(&connection->bundle_links); + + spin_unlock_irq(&gb_connections_lock); + + mutex_unlock(&gb_connection_mutex); + + trace_gb_connection_create(connection); + + return connection; + +err_free_connection: + kfree(connection); +err_hd_cport_release: + gb_hd_cport_release(hd, hd_cport_id); +err_unlock: + mutex_unlock(&gb_connection_mutex); + + return ERR_PTR(ret); +} + +struct gb_connection * +gb_connection_create_static(struct gb_host_device *hd, u16 hd_cport_id, + gb_request_handler_t handler) +{ + return _gb_connection_create(hd, hd_cport_id, NULL, NULL, 0, handler, + GB_CONNECTION_FLAG_HIGH_PRIO); +} + +struct gb_connection * +gb_connection_create_control(struct gb_interface *intf) +{ + return _gb_connection_create(intf->hd, -1, intf, NULL, 0, NULL, + GB_CONNECTION_FLAG_CONTROL | + GB_CONNECTION_FLAG_HIGH_PRIO); +} + +struct gb_connection * +gb_connection_create(struct gb_bundle *bundle, u16 cport_id, + gb_request_handler_t handler) +{ + struct gb_interface *intf = bundle->intf; + + return _gb_connection_create(intf->hd, -1, intf, bundle, cport_id, + handler, 0); +} +EXPORT_SYMBOL_GPL(gb_connection_create); + +struct gb_connection * +gb_connection_create_flags(struct gb_bundle *bundle, u16 cport_id, + gb_request_handler_t handler, + unsigned long flags) +{ + struct gb_interface *intf = bundle->intf; + + if (WARN_ON_ONCE(flags & GB_CONNECTION_FLAG_CORE_MASK)) + flags &= ~GB_CONNECTION_FLAG_CORE_MASK; + + return _gb_connection_create(intf->hd, -1, intf, bundle, cport_id, + handler, flags); +} +EXPORT_SYMBOL_GPL(gb_connection_create_flags); + +struct gb_connection * +gb_connection_create_offloaded(struct gb_bundle *bundle, u16 cport_id, + unsigned long flags) +{ + flags |= GB_CONNECTION_FLAG_OFFLOADED; + + return gb_connection_create_flags(bundle, cport_id, NULL, flags); +} +EXPORT_SYMBOL_GPL(gb_connection_create_offloaded); + +static int gb_connection_hd_cport_enable(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->cport_enable) + return 0; + + ret = hd->driver->cport_enable(hd, connection->hd_cport_id, + connection->flags); + if (ret) { + dev_err(&hd->dev, "%s: failed to enable host cport: %d\n", + connection->name, ret); + return ret; + } + + return 0; +} + +static void gb_connection_hd_cport_disable(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->cport_disable) + return; + + ret = hd->driver->cport_disable(hd, connection->hd_cport_id); + if (ret) { + dev_err(&hd->dev, "%s: failed to disable host cport: %d\n", + connection->name, ret); + } +} + +static int gb_connection_hd_cport_connected(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->cport_connected) + return 0; + + ret = hd->driver->cport_connected(hd, connection->hd_cport_id); + if (ret) { + dev_err(&hd->dev, "%s: failed to set connected state: %d\n", + connection->name, ret); + return ret; + } + + return 0; +} + +static int gb_connection_hd_cport_flush(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->cport_flush) + return 0; + + ret = hd->driver->cport_flush(hd, connection->hd_cport_id); + if (ret) { + dev_err(&hd->dev, "%s: failed to flush host cport: %d\n", + connection->name, ret); + return ret; + } + + return 0; +} + +static int gb_connection_hd_cport_quiesce(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + size_t peer_space; + int ret; + + if (!hd->driver->cport_quiesce) + return 0; + + peer_space = sizeof(struct gb_operation_msg_hdr) + + sizeof(struct gb_cport_shutdown_request); + + if (connection->mode_switch) + peer_space += sizeof(struct gb_operation_msg_hdr); + + ret = hd->driver->cport_quiesce(hd, connection->hd_cport_id, + peer_space, + GB_CONNECTION_CPORT_QUIESCE_TIMEOUT); + if (ret) { + dev_err(&hd->dev, "%s: failed to quiesce host cport: %d\n", + connection->name, ret); + return ret; + } + + return 0; +} + +static int gb_connection_hd_cport_clear(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->cport_clear) + return 0; + + ret = hd->driver->cport_clear(hd, connection->hd_cport_id); + if (ret) { + dev_err(&hd->dev, "%s: failed to clear host cport: %d\n", + connection->name, ret); + return ret; + } + + return 0; +} + +/* + * Request the SVC to create a connection from AP's cport to interface's + * cport. + */ +static int +gb_connection_svc_connection_create(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + struct gb_interface *intf; + u8 cport_flags; + int ret; + + if (gb_connection_is_static(connection)) + return 0; + + intf = connection->intf; + + /* + * Enable either E2EFC or CSD, unless no flow control is requested. + */ + cport_flags = GB_SVC_CPORT_FLAG_CSV_N; + if (gb_connection_flow_control_disabled(connection)) { + cport_flags |= GB_SVC_CPORT_FLAG_CSD_N; + } else if (gb_connection_e2efc_enabled(connection)) { + cport_flags |= GB_SVC_CPORT_FLAG_CSD_N | + GB_SVC_CPORT_FLAG_E2EFC; + } + + ret = gb_svc_connection_create(hd->svc, + hd->svc->ap_intf_id, + connection->hd_cport_id, + intf->interface_id, + connection->intf_cport_id, + cport_flags); + if (ret) { + dev_err(&connection->hd->dev, + "%s: failed to create svc connection: %d\n", + connection->name, ret); + return ret; + } + + return 0; +} + +static void +gb_connection_svc_connection_destroy(struct gb_connection *connection) +{ + if (gb_connection_is_static(connection)) + return; + + gb_svc_connection_destroy(connection->hd->svc, + connection->hd->svc->ap_intf_id, + connection->hd_cport_id, + connection->intf->interface_id, + connection->intf_cport_id); +} + +/* Inform Interface about active CPorts */ +static int gb_connection_control_connected(struct gb_connection *connection) +{ + struct gb_control *control; + u16 cport_id = connection->intf_cport_id; + int ret; + + if (gb_connection_is_static(connection)) + return 0; + + if (gb_connection_is_control(connection)) + return 0; + + control = connection->intf->control; + + ret = gb_control_connected_operation(control, cport_id); + if (ret) { + dev_err(&connection->bundle->dev, + "failed to connect cport: %d\n", ret); + return ret; + } + + return 0; +} + +static void +gb_connection_control_disconnecting(struct gb_connection *connection) +{ + struct gb_control *control; + u16 cport_id = connection->intf_cport_id; + int ret; + + if (gb_connection_is_static(connection)) + return; + + control = connection->intf->control; + + ret = gb_control_disconnecting_operation(control, cport_id); + if (ret) { + dev_err(&connection->hd->dev, + "%s: failed to send disconnecting: %d\n", + connection->name, ret); + } +} + +static void +gb_connection_control_disconnected(struct gb_connection *connection) +{ + struct gb_control *control; + u16 cport_id = connection->intf_cport_id; + int ret; + + if (gb_connection_is_static(connection)) + return; + + control = connection->intf->control; + + if (gb_connection_is_control(connection)) { + if (connection->mode_switch) { + ret = gb_control_mode_switch_operation(control); + if (ret) { + /* + * Allow mode switch to time out waiting for + * mailbox event. + */ + return; + } + } + + return; + } + + ret = gb_control_disconnected_operation(control, cport_id); + if (ret) { + dev_warn(&connection->bundle->dev, + "failed to disconnect cport: %d\n", ret); + } +} + +static int gb_connection_shutdown_operation(struct gb_connection *connection, + u8 phase) +{ + struct gb_cport_shutdown_request *req; + struct gb_operation *operation; + int ret; + + operation = gb_operation_create_core(connection, + GB_REQUEST_TYPE_CPORT_SHUTDOWN, + sizeof(*req), 0, 0, + GFP_KERNEL); + if (!operation) + return -ENOMEM; + + req = operation->request->payload; + req->phase = phase; + + ret = gb_operation_request_send_sync(operation); + + gb_operation_put(operation); + + return ret; +} + +static int gb_connection_cport_shutdown(struct gb_connection *connection, + u8 phase) +{ + struct gb_host_device *hd = connection->hd; + const struct gb_hd_driver *drv = hd->driver; + int ret; + + if (gb_connection_is_static(connection)) + return 0; + + if (gb_connection_is_offloaded(connection)) { + if (!drv->cport_shutdown) + return 0; + + ret = drv->cport_shutdown(hd, connection->hd_cport_id, phase, + GB_OPERATION_TIMEOUT_DEFAULT); + } else { + ret = gb_connection_shutdown_operation(connection, phase); + } + + if (ret) { + dev_err(&hd->dev, "%s: failed to send cport shutdown (phase %d): %d\n", + connection->name, phase, ret); + return ret; + } + + return 0; +} + +static int +gb_connection_cport_shutdown_phase_1(struct gb_connection *connection) +{ + return gb_connection_cport_shutdown(connection, 1); +} + +static int +gb_connection_cport_shutdown_phase_2(struct gb_connection *connection) +{ + return gb_connection_cport_shutdown(connection, 2); +} + +/* + * Cancel all active operations on a connection. + * + * Locking: Called with connection lock held and state set to DISABLED or + * DISCONNECTING. + */ +static void gb_connection_cancel_operations(struct gb_connection *connection, + int errno) + __must_hold(&connection->lock) +{ + struct gb_operation *operation; + + while (!list_empty(&connection->operations)) { + operation = list_last_entry(&connection->operations, + struct gb_operation, links); + gb_operation_get(operation); + spin_unlock_irq(&connection->lock); + + if (gb_operation_is_incoming(operation)) + gb_operation_cancel_incoming(operation, errno); + else + gb_operation_cancel(operation, errno); + + gb_operation_put(operation); + + spin_lock_irq(&connection->lock); + } +} + +/* + * Cancel all active incoming operations on a connection. + * + * Locking: Called with connection lock held and state set to ENABLED_TX. + */ +static void +gb_connection_flush_incoming_operations(struct gb_connection *connection, + int errno) + __must_hold(&connection->lock) +{ + struct gb_operation *operation; + bool incoming; + + while (!list_empty(&connection->operations)) { + incoming = false; + list_for_each_entry(operation, &connection->operations, + links) { + if (gb_operation_is_incoming(operation)) { + gb_operation_get(operation); + incoming = true; + break; + } + } + + if (!incoming) + break; + + spin_unlock_irq(&connection->lock); + + /* FIXME: flush, not cancel? */ + gb_operation_cancel_incoming(operation, errno); + gb_operation_put(operation); + + spin_lock_irq(&connection->lock); + } +} + +/* + * _gb_connection_enable() - enable a connection + * @connection: connection to enable + * @rx: whether to enable incoming requests + * + * Connection-enable helper for DISABLED->ENABLED, DISABLED->ENABLED_TX, and + * ENABLED_TX->ENABLED state transitions. + * + * Locking: Caller holds connection->mutex. + */ +static int _gb_connection_enable(struct gb_connection *connection, bool rx) +{ + int ret; + + /* Handle ENABLED_TX -> ENABLED transitions. */ + if (connection->state == GB_CONNECTION_STATE_ENABLED_TX) { + if (!(connection->handler && rx)) + return 0; + + spin_lock_irq(&connection->lock); + connection->state = GB_CONNECTION_STATE_ENABLED; + spin_unlock_irq(&connection->lock); + + return 0; + } + + ret = gb_connection_hd_cport_enable(connection); + if (ret) + return ret; + + ret = gb_connection_svc_connection_create(connection); + if (ret) + goto err_hd_cport_clear; + + ret = gb_connection_hd_cport_connected(connection); + if (ret) + goto err_svc_connection_destroy; + + spin_lock_irq(&connection->lock); + if (connection->handler && rx) + connection->state = GB_CONNECTION_STATE_ENABLED; + else + connection->state = GB_CONNECTION_STATE_ENABLED_TX; + spin_unlock_irq(&connection->lock); + + ret = gb_connection_control_connected(connection); + if (ret) + goto err_control_disconnecting; + + return 0; + +err_control_disconnecting: + spin_lock_irq(&connection->lock); + connection->state = GB_CONNECTION_STATE_DISCONNECTING; + gb_connection_cancel_operations(connection, -ESHUTDOWN); + spin_unlock_irq(&connection->lock); + + /* Transmit queue should already be empty. */ + gb_connection_hd_cport_flush(connection); + + gb_connection_control_disconnecting(connection); + gb_connection_cport_shutdown_phase_1(connection); + gb_connection_hd_cport_quiesce(connection); + gb_connection_cport_shutdown_phase_2(connection); + gb_connection_control_disconnected(connection); + connection->state = GB_CONNECTION_STATE_DISABLED; +err_svc_connection_destroy: + gb_connection_svc_connection_destroy(connection); +err_hd_cport_clear: + gb_connection_hd_cport_clear(connection); + + gb_connection_hd_cport_disable(connection); + + return ret; +} + +int gb_connection_enable(struct gb_connection *connection) +{ + int ret = 0; + + mutex_lock(&connection->mutex); + + if (connection->state == GB_CONNECTION_STATE_ENABLED) + goto out_unlock; + + ret = _gb_connection_enable(connection, true); + if (!ret) + trace_gb_connection_enable(connection); + +out_unlock: + mutex_unlock(&connection->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(gb_connection_enable); + +int gb_connection_enable_tx(struct gb_connection *connection) +{ + int ret = 0; + + mutex_lock(&connection->mutex); + + if (connection->state == GB_CONNECTION_STATE_ENABLED) { + ret = -EINVAL; + goto out_unlock; + } + + if (connection->state == GB_CONNECTION_STATE_ENABLED_TX) + goto out_unlock; + + ret = _gb_connection_enable(connection, false); + if (!ret) + trace_gb_connection_enable(connection); + +out_unlock: + mutex_unlock(&connection->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(gb_connection_enable_tx); + +void gb_connection_disable_rx(struct gb_connection *connection) +{ + mutex_lock(&connection->mutex); + + spin_lock_irq(&connection->lock); + if (connection->state != GB_CONNECTION_STATE_ENABLED) { + spin_unlock_irq(&connection->lock); + goto out_unlock; + } + connection->state = GB_CONNECTION_STATE_ENABLED_TX; + gb_connection_flush_incoming_operations(connection, -ESHUTDOWN); + spin_unlock_irq(&connection->lock); + + trace_gb_connection_disable(connection); + +out_unlock: + mutex_unlock(&connection->mutex); +} +EXPORT_SYMBOL_GPL(gb_connection_disable_rx); + +void gb_connection_mode_switch_prepare(struct gb_connection *connection) +{ + connection->mode_switch = true; +} + +void gb_connection_mode_switch_complete(struct gb_connection *connection) +{ + gb_connection_svc_connection_destroy(connection); + gb_connection_hd_cport_clear(connection); + + gb_connection_hd_cport_disable(connection); + + connection->mode_switch = false; +} + +void gb_connection_disable(struct gb_connection *connection) +{ + mutex_lock(&connection->mutex); + + if (connection->state == GB_CONNECTION_STATE_DISABLED) + goto out_unlock; + + trace_gb_connection_disable(connection); + + spin_lock_irq(&connection->lock); + connection->state = GB_CONNECTION_STATE_DISCONNECTING; + gb_connection_cancel_operations(connection, -ESHUTDOWN); + spin_unlock_irq(&connection->lock); + + gb_connection_hd_cport_flush(connection); + + gb_connection_control_disconnecting(connection); + gb_connection_cport_shutdown_phase_1(connection); + gb_connection_hd_cport_quiesce(connection); + gb_connection_cport_shutdown_phase_2(connection); + gb_connection_control_disconnected(connection); + + connection->state = GB_CONNECTION_STATE_DISABLED; + + /* control-connection tear down is deferred when mode switching */ + if (!connection->mode_switch) { + gb_connection_svc_connection_destroy(connection); + gb_connection_hd_cport_clear(connection); + + gb_connection_hd_cport_disable(connection); + } + +out_unlock: + mutex_unlock(&connection->mutex); +} +EXPORT_SYMBOL_GPL(gb_connection_disable); + +/* Disable a connection without communicating with the remote end. */ +void gb_connection_disable_forced(struct gb_connection *connection) +{ + mutex_lock(&connection->mutex); + + if (connection->state == GB_CONNECTION_STATE_DISABLED) + goto out_unlock; + + trace_gb_connection_disable(connection); + + spin_lock_irq(&connection->lock); + connection->state = GB_CONNECTION_STATE_DISABLED; + gb_connection_cancel_operations(connection, -ESHUTDOWN); + spin_unlock_irq(&connection->lock); + + gb_connection_hd_cport_flush(connection); + + gb_connection_svc_connection_destroy(connection); + gb_connection_hd_cport_clear(connection); + + gb_connection_hd_cport_disable(connection); +out_unlock: + mutex_unlock(&connection->mutex); +} +EXPORT_SYMBOL_GPL(gb_connection_disable_forced); + +/* Caller must have disabled the connection before destroying it. */ +void gb_connection_destroy(struct gb_connection *connection) +{ + if (!connection) + return; + + if (WARN_ON(connection->state != GB_CONNECTION_STATE_DISABLED)) + gb_connection_disable(connection); + + mutex_lock(&gb_connection_mutex); + + spin_lock_irq(&gb_connections_lock); + list_del(&connection->bundle_links); + list_del(&connection->hd_links); + spin_unlock_irq(&gb_connections_lock); + + destroy_workqueue(connection->wq); + + gb_hd_cport_release(connection->hd, connection->hd_cport_id); + connection->hd_cport_id = CPORT_ID_BAD; + + mutex_unlock(&gb_connection_mutex); + + gb_connection_put(connection); +} +EXPORT_SYMBOL_GPL(gb_connection_destroy); + +void gb_connection_latency_tag_enable(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->latency_tag_enable) + return; + + ret = hd->driver->latency_tag_enable(hd, connection->hd_cport_id); + if (ret) { + dev_err(&connection->hd->dev, + "%s: failed to enable latency tag: %d\n", + connection->name, ret); + } +} +EXPORT_SYMBOL_GPL(gb_connection_latency_tag_enable); + +void gb_connection_latency_tag_disable(struct gb_connection *connection) +{ + struct gb_host_device *hd = connection->hd; + int ret; + + if (!hd->driver->latency_tag_disable) + return; + + ret = hd->driver->latency_tag_disable(hd, connection->hd_cport_id); + if (ret) { + dev_err(&connection->hd->dev, + "%s: failed to disable latency tag: %d\n", + connection->name, ret); + } +} +EXPORT_SYMBOL_GPL(gb_connection_latency_tag_disable); -- cgit v1.2.3