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(). ... --- sound/xen/xen_snd_front_evtchnl.c | 466 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 466 insertions(+) create mode 100644 sound/xen/xen_snd_front_evtchnl.c (limited to 'sound/xen/xen_snd_front_evtchnl.c') diff --git a/sound/xen/xen_snd_front_evtchnl.c b/sound/xen/xen_snd_front_evtchnl.c new file mode 100644 index 000000000..26d1b3987 --- /dev/null +++ b/sound/xen/xen_snd_front_evtchnl.c @@ -0,0 +1,466 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT + +/* + * Xen para-virtual sound device + * + * Copyright (C) 2016-2018 EPAM Systems Inc. + * + * Author: Oleksandr Andrushchenko + */ + +#include +#include +#include +#include + +#include "xen_snd_front.h" +#include "xen_snd_front_alsa.h" +#include "xen_snd_front_cfg.h" +#include "xen_snd_front_evtchnl.h" + +static irqreturn_t evtchnl_interrupt_req(int irq, void *dev_id) +{ + struct xen_snd_front_evtchnl *channel = dev_id; + struct xen_snd_front_info *front_info = channel->front_info; + struct xensnd_resp *resp; + RING_IDX i, rp; + + if (unlikely(channel->state != EVTCHNL_STATE_CONNECTED)) + return IRQ_HANDLED; + + mutex_lock(&channel->ring_io_lock); + +again: + rp = channel->u.req.ring.sring->rsp_prod; + /* Ensure we see queued responses up to rp. */ + rmb(); + + /* + * Assume that the backend is trusted to always write sane values + * to the ring counters, so no overflow checks on frontend side + * are required. + */ + for (i = channel->u.req.ring.rsp_cons; i != rp; i++) { + resp = RING_GET_RESPONSE(&channel->u.req.ring, i); + if (resp->id != channel->evt_id) + continue; + switch (resp->operation) { + case XENSND_OP_OPEN: + case XENSND_OP_CLOSE: + case XENSND_OP_READ: + case XENSND_OP_WRITE: + case XENSND_OP_TRIGGER: + channel->u.req.resp_status = resp->status; + complete(&channel->u.req.completion); + break; + case XENSND_OP_HW_PARAM_QUERY: + channel->u.req.resp_status = resp->status; + channel->u.req.resp.hw_param = + resp->resp.hw_param; + complete(&channel->u.req.completion); + break; + + default: + dev_err(&front_info->xb_dev->dev, + "Operation %d is not supported\n", + resp->operation); + break; + } + } + + channel->u.req.ring.rsp_cons = i; + if (i != channel->u.req.ring.req_prod_pvt) { + int more_to_do; + + RING_FINAL_CHECK_FOR_RESPONSES(&channel->u.req.ring, + more_to_do); + if (more_to_do) + goto again; + } else { + channel->u.req.ring.sring->rsp_event = i + 1; + } + + mutex_unlock(&channel->ring_io_lock); + return IRQ_HANDLED; +} + +static irqreturn_t evtchnl_interrupt_evt(int irq, void *dev_id) +{ + struct xen_snd_front_evtchnl *channel = dev_id; + struct xensnd_event_page *page = channel->u.evt.page; + u32 cons, prod; + + if (unlikely(channel->state != EVTCHNL_STATE_CONNECTED)) + return IRQ_HANDLED; + + mutex_lock(&channel->ring_io_lock); + + prod = page->in_prod; + /* Ensure we see ring contents up to prod. */ + virt_rmb(); + if (prod == page->in_cons) + goto out; + + /* + * Assume that the backend is trusted to always write sane values + * to the ring counters, so no overflow checks on frontend side + * are required. + */ + for (cons = page->in_cons; cons != prod; cons++) { + struct xensnd_evt *event; + + event = &XENSND_IN_RING_REF(page, cons); + if (unlikely(event->id != channel->evt_id++)) + continue; + + switch (event->type) { + case XENSND_EVT_CUR_POS: + xen_snd_front_alsa_handle_cur_pos(channel, + event->op.cur_pos.position); + break; + } + } + + page->in_cons = cons; + /* Ensure ring contents. */ + virt_wmb(); + +out: + mutex_unlock(&channel->ring_io_lock); + return IRQ_HANDLED; +} + +void xen_snd_front_evtchnl_flush(struct xen_snd_front_evtchnl *channel) +{ + int notify; + + channel->u.req.ring.req_prod_pvt++; + RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&channel->u.req.ring, notify); + if (notify) + notify_remote_via_irq(channel->irq); +} + +static void evtchnl_free(struct xen_snd_front_info *front_info, + struct xen_snd_front_evtchnl *channel) +{ + void *page = NULL; + + if (channel->type == EVTCHNL_TYPE_REQ) + page = channel->u.req.ring.sring; + else if (channel->type == EVTCHNL_TYPE_EVT) + page = channel->u.evt.page; + + if (!page) + return; + + channel->state = EVTCHNL_STATE_DISCONNECTED; + if (channel->type == EVTCHNL_TYPE_REQ) { + /* Release all who still waits for response if any. */ + channel->u.req.resp_status = -EIO; + complete_all(&channel->u.req.completion); + } + + if (channel->irq) + unbind_from_irqhandler(channel->irq, channel); + + if (channel->port) + xenbus_free_evtchn(front_info->xb_dev, channel->port); + + /* End access and free the page. */ + xenbus_teardown_ring(&page, 1, &channel->gref); + + memset(channel, 0, sizeof(*channel)); +} + +void xen_snd_front_evtchnl_free_all(struct xen_snd_front_info *front_info) +{ + int i; + + if (!front_info->evt_pairs) + return; + + for (i = 0; i < front_info->num_evt_pairs; i++) { + evtchnl_free(front_info, &front_info->evt_pairs[i].req); + evtchnl_free(front_info, &front_info->evt_pairs[i].evt); + } + + kfree(front_info->evt_pairs); + front_info->evt_pairs = NULL; +} + +static int evtchnl_alloc(struct xen_snd_front_info *front_info, int index, + struct xen_snd_front_evtchnl *channel, + enum xen_snd_front_evtchnl_type type) +{ + struct xenbus_device *xb_dev = front_info->xb_dev; + void *page; + irq_handler_t handler; + char *handler_name = NULL; + int ret; + + memset(channel, 0, sizeof(*channel)); + channel->type = type; + channel->index = index; + channel->front_info = front_info; + channel->state = EVTCHNL_STATE_DISCONNECTED; + ret = xenbus_setup_ring(xb_dev, GFP_KERNEL, &page, 1, &channel->gref); + if (ret) + goto fail; + + handler_name = kasprintf(GFP_KERNEL, "%s-%s", XENSND_DRIVER_NAME, + type == EVTCHNL_TYPE_REQ ? + XENSND_FIELD_RING_REF : + XENSND_FIELD_EVT_RING_REF); + if (!handler_name) { + ret = -ENOMEM; + goto fail; + } + + mutex_init(&channel->ring_io_lock); + + if (type == EVTCHNL_TYPE_REQ) { + struct xen_sndif_sring *sring = page; + + init_completion(&channel->u.req.completion); + mutex_init(&channel->u.req.req_io_lock); + XEN_FRONT_RING_INIT(&channel->u.req.ring, sring, XEN_PAGE_SIZE); + + handler = evtchnl_interrupt_req; + } else { + channel->u.evt.page = page; + handler = evtchnl_interrupt_evt; + } + + ret = xenbus_alloc_evtchn(xb_dev, &channel->port); + if (ret < 0) + goto fail; + + ret = bind_evtchn_to_irq(channel->port); + if (ret < 0) { + dev_err(&xb_dev->dev, + "Failed to bind IRQ for domid %d port %d: %d\n", + front_info->xb_dev->otherend_id, channel->port, ret); + goto fail; + } + + channel->irq = ret; + + ret = request_threaded_irq(channel->irq, NULL, handler, + IRQF_ONESHOT, handler_name, channel); + if (ret < 0) { + dev_err(&xb_dev->dev, "Failed to request IRQ %d: %d\n", + channel->irq, ret); + goto fail; + } + + kfree(handler_name); + return 0; + +fail: + kfree(handler_name); + dev_err(&xb_dev->dev, "Failed to allocate ring: %d\n", ret); + return ret; +} + +int xen_snd_front_evtchnl_create_all(struct xen_snd_front_info *front_info, + int num_streams) +{ + struct xen_front_cfg_card *cfg = &front_info->cfg; + struct device *dev = &front_info->xb_dev->dev; + int d, ret = 0; + + front_info->evt_pairs = + kcalloc(num_streams, + sizeof(struct xen_snd_front_evtchnl_pair), + GFP_KERNEL); + if (!front_info->evt_pairs) + return -ENOMEM; + + /* Iterate over devices and their streams and create event channels. */ + for (d = 0; d < cfg->num_pcm_instances; d++) { + struct xen_front_cfg_pcm_instance *pcm_instance; + int s, index; + + pcm_instance = &cfg->pcm_instances[d]; + + for (s = 0; s < pcm_instance->num_streams_pb; s++) { + index = pcm_instance->streams_pb[s].index; + + ret = evtchnl_alloc(front_info, index, + &front_info->evt_pairs[index].req, + EVTCHNL_TYPE_REQ); + if (ret < 0) { + dev_err(dev, "Error allocating control channel\n"); + goto fail; + } + + ret = evtchnl_alloc(front_info, index, + &front_info->evt_pairs[index].evt, + EVTCHNL_TYPE_EVT); + if (ret < 0) { + dev_err(dev, "Error allocating in-event channel\n"); + goto fail; + } + } + + for (s = 0; s < pcm_instance->num_streams_cap; s++) { + index = pcm_instance->streams_cap[s].index; + + ret = evtchnl_alloc(front_info, index, + &front_info->evt_pairs[index].req, + EVTCHNL_TYPE_REQ); + if (ret < 0) { + dev_err(dev, "Error allocating control channel\n"); + goto fail; + } + + ret = evtchnl_alloc(front_info, index, + &front_info->evt_pairs[index].evt, + EVTCHNL_TYPE_EVT); + if (ret < 0) { + dev_err(dev, "Error allocating in-event channel\n"); + goto fail; + } + } + } + + front_info->num_evt_pairs = num_streams; + return 0; + +fail: + xen_snd_front_evtchnl_free_all(front_info); + return ret; +} + +static int evtchnl_publish(struct xenbus_transaction xbt, + struct xen_snd_front_evtchnl *channel, + const char *path, const char *node_ring, + const char *node_chnl) +{ + struct xenbus_device *xb_dev = channel->front_info->xb_dev; + int ret; + + /* Write control channel ring reference. */ + ret = xenbus_printf(xbt, path, node_ring, "%u", channel->gref); + if (ret < 0) { + dev_err(&xb_dev->dev, "Error writing ring-ref: %d\n", ret); + return ret; + } + + /* Write event channel ring reference. */ + ret = xenbus_printf(xbt, path, node_chnl, "%u", channel->port); + if (ret < 0) { + dev_err(&xb_dev->dev, "Error writing event channel: %d\n", ret); + return ret; + } + + return 0; +} + +int xen_snd_front_evtchnl_publish_all(struct xen_snd_front_info *front_info) +{ + struct xen_front_cfg_card *cfg = &front_info->cfg; + struct xenbus_transaction xbt; + int ret, d; + +again: + ret = xenbus_transaction_start(&xbt); + if (ret < 0) { + xenbus_dev_fatal(front_info->xb_dev, ret, + "starting transaction"); + return ret; + } + + for (d = 0; d < cfg->num_pcm_instances; d++) { + struct xen_front_cfg_pcm_instance *pcm_instance; + int s, index; + + pcm_instance = &cfg->pcm_instances[d]; + + for (s = 0; s < pcm_instance->num_streams_pb; s++) { + index = pcm_instance->streams_pb[s].index; + + ret = evtchnl_publish(xbt, + &front_info->evt_pairs[index].req, + pcm_instance->streams_pb[s].xenstore_path, + XENSND_FIELD_RING_REF, + XENSND_FIELD_EVT_CHNL); + if (ret < 0) + goto fail; + + ret = evtchnl_publish(xbt, + &front_info->evt_pairs[index].evt, + pcm_instance->streams_pb[s].xenstore_path, + XENSND_FIELD_EVT_RING_REF, + XENSND_FIELD_EVT_EVT_CHNL); + if (ret < 0) + goto fail; + } + + for (s = 0; s < pcm_instance->num_streams_cap; s++) { + index = pcm_instance->streams_cap[s].index; + + ret = evtchnl_publish(xbt, + &front_info->evt_pairs[index].req, + pcm_instance->streams_cap[s].xenstore_path, + XENSND_FIELD_RING_REF, + XENSND_FIELD_EVT_CHNL); + if (ret < 0) + goto fail; + + ret = evtchnl_publish(xbt, + &front_info->evt_pairs[index].evt, + pcm_instance->streams_cap[s].xenstore_path, + XENSND_FIELD_EVT_RING_REF, + XENSND_FIELD_EVT_EVT_CHNL); + if (ret < 0) + goto fail; + } + } + ret = xenbus_transaction_end(xbt, 0); + if (ret < 0) { + if (ret == -EAGAIN) + goto again; + + xenbus_dev_fatal(front_info->xb_dev, ret, + "completing transaction"); + goto fail_to_end; + } + return 0; +fail: + xenbus_transaction_end(xbt, 1); +fail_to_end: + xenbus_dev_fatal(front_info->xb_dev, ret, "writing XenStore"); + return ret; +} + +void xen_snd_front_evtchnl_pair_set_connected(struct xen_snd_front_evtchnl_pair *evt_pair, + bool is_connected) +{ + enum xen_snd_front_evtchnl_state state; + + if (is_connected) + state = EVTCHNL_STATE_CONNECTED; + else + state = EVTCHNL_STATE_DISCONNECTED; + + mutex_lock(&evt_pair->req.ring_io_lock); + evt_pair->req.state = state; + mutex_unlock(&evt_pair->req.ring_io_lock); + + mutex_lock(&evt_pair->evt.ring_io_lock); + evt_pair->evt.state = state; + mutex_unlock(&evt_pair->evt.ring_io_lock); +} + +void xen_snd_front_evtchnl_pair_clear(struct xen_snd_front_evtchnl_pair *evt_pair) +{ + mutex_lock(&evt_pair->req.ring_io_lock); + evt_pair->req.evt_next_id = 0; + mutex_unlock(&evt_pair->req.ring_io_lock); + + mutex_lock(&evt_pair->evt.ring_io_lock); + evt_pair->evt.evt_next_id = 0; + mutex_unlock(&evt_pair->evt.ring_io_lock); +} + -- cgit v1.2.3