diff options
author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/media/v4l2-core/v4l2-event.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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().
...
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-event.c')
-rw-r--r-- | drivers/media/v4l2-core/v4l2-event.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c new file mode 100644 index 000000000..c5ce9f11a --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-event.c @@ -0,0 +1,373 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * v4l2-event.c + * + * V4L2 events. + * + * Copyright (C) 2009--2010 Nokia Corporation. + * + * Contact: Sakari Ailus <sakari.ailus@iki.fi> + */ + +#include <media/v4l2-dev.h> +#include <media/v4l2-fh.h> +#include <media/v4l2-event.h> + +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/export.h> + +static unsigned int sev_pos(const struct v4l2_subscribed_event *sev, unsigned int idx) +{ + idx += sev->first; + return idx >= sev->elems ? idx - sev->elems : idx; +} + +static int __v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event) +{ + struct v4l2_kevent *kev; + struct timespec64 ts; + unsigned long flags; + + spin_lock_irqsave(&fh->vdev->fh_lock, flags); + + if (list_empty(&fh->available)) { + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); + return -ENOENT; + } + + WARN_ON(fh->navailable == 0); + + kev = list_first_entry(&fh->available, struct v4l2_kevent, list); + list_del(&kev->list); + fh->navailable--; + + kev->event.pending = fh->navailable; + *event = kev->event; + ts = ns_to_timespec64(kev->ts); + event->timestamp.tv_sec = ts.tv_sec; + event->timestamp.tv_nsec = ts.tv_nsec; + kev->sev->first = sev_pos(kev->sev, 1); + kev->sev->in_use--; + + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); + + return 0; +} + +int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event, + int nonblocking) +{ + int ret; + + if (nonblocking) + return __v4l2_event_dequeue(fh, event); + + /* Release the vdev lock while waiting */ + if (fh->vdev->lock) + mutex_unlock(fh->vdev->lock); + + do { + ret = wait_event_interruptible(fh->wait, + fh->navailable != 0); + if (ret < 0) + break; + + ret = __v4l2_event_dequeue(fh, event); + } while (ret == -ENOENT); + + if (fh->vdev->lock) + mutex_lock(fh->vdev->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_event_dequeue); + +/* Caller must hold fh->vdev->fh_lock! */ +static struct v4l2_subscribed_event *v4l2_event_subscribed( + struct v4l2_fh *fh, u32 type, u32 id) +{ + struct v4l2_subscribed_event *sev; + + assert_spin_locked(&fh->vdev->fh_lock); + + list_for_each_entry(sev, &fh->subscribed, list) + if (sev->type == type && sev->id == id) + return sev; + + return NULL; +} + +static void __v4l2_event_queue_fh(struct v4l2_fh *fh, + const struct v4l2_event *ev, u64 ts) +{ + struct v4l2_subscribed_event *sev; + struct v4l2_kevent *kev; + bool copy_payload = true; + + /* Are we subscribed? */ + sev = v4l2_event_subscribed(fh, ev->type, ev->id); + if (sev == NULL) + return; + + /* Increase event sequence number on fh. */ + fh->sequence++; + + /* Do we have any free events? */ + if (sev->in_use == sev->elems) { + /* no, remove the oldest one */ + kev = sev->events + sev_pos(sev, 0); + list_del(&kev->list); + sev->in_use--; + sev->first = sev_pos(sev, 1); + fh->navailable--; + if (sev->elems == 1) { + if (sev->ops && sev->ops->replace) { + sev->ops->replace(&kev->event, ev); + copy_payload = false; + } + } else if (sev->ops && sev->ops->merge) { + struct v4l2_kevent *second_oldest = + sev->events + sev_pos(sev, 0); + sev->ops->merge(&kev->event, &second_oldest->event); + } + } + + /* Take one and fill it. */ + kev = sev->events + sev_pos(sev, sev->in_use); + kev->event.type = ev->type; + if (copy_payload) + kev->event.u = ev->u; + kev->event.id = ev->id; + kev->ts = ts; + kev->event.sequence = fh->sequence; + sev->in_use++; + list_add_tail(&kev->list, &fh->available); + + fh->navailable++; + + wake_up_all(&fh->wait); +} + +void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev) +{ + struct v4l2_fh *fh; + unsigned long flags; + u64 ts; + + if (vdev == NULL) + return; + + ts = ktime_get_ns(); + + spin_lock_irqsave(&vdev->fh_lock, flags); + + list_for_each_entry(fh, &vdev->fh_list, list) + __v4l2_event_queue_fh(fh, ev, ts); + + spin_unlock_irqrestore(&vdev->fh_lock, flags); +} +EXPORT_SYMBOL_GPL(v4l2_event_queue); + +void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev) +{ + unsigned long flags; + u64 ts = ktime_get_ns(); + + spin_lock_irqsave(&fh->vdev->fh_lock, flags); + __v4l2_event_queue_fh(fh, ev, ts); + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); +} +EXPORT_SYMBOL_GPL(v4l2_event_queue_fh); + +int v4l2_event_pending(struct v4l2_fh *fh) +{ + return fh->navailable; +} +EXPORT_SYMBOL_GPL(v4l2_event_pending); + +void v4l2_event_wake_all(struct video_device *vdev) +{ + struct v4l2_fh *fh; + unsigned long flags; + + if (!vdev) + return; + + spin_lock_irqsave(&vdev->fh_lock, flags); + + list_for_each_entry(fh, &vdev->fh_list, list) + wake_up_all(&fh->wait); + + spin_unlock_irqrestore(&vdev->fh_lock, flags); +} +EXPORT_SYMBOL_GPL(v4l2_event_wake_all); + +static void __v4l2_event_unsubscribe(struct v4l2_subscribed_event *sev) +{ + struct v4l2_fh *fh = sev->fh; + unsigned int i; + + lockdep_assert_held(&fh->subscribe_lock); + assert_spin_locked(&fh->vdev->fh_lock); + + /* Remove any pending events for this subscription */ + for (i = 0; i < sev->in_use; i++) { + list_del(&sev->events[sev_pos(sev, i)].list); + fh->navailable--; + } + list_del(&sev->list); +} + +int v4l2_event_subscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub, unsigned int elems, + const struct v4l2_subscribed_event_ops *ops) +{ + struct v4l2_subscribed_event *sev, *found_ev; + unsigned long flags; + unsigned int i; + int ret = 0; + + if (sub->type == V4L2_EVENT_ALL) + return -EINVAL; + + if (elems < 1) + elems = 1; + + sev = kvzalloc(struct_size(sev, events, elems), GFP_KERNEL); + if (!sev) + return -ENOMEM; + for (i = 0; i < elems; i++) + sev->events[i].sev = sev; + sev->type = sub->type; + sev->id = sub->id; + sev->flags = sub->flags; + sev->fh = fh; + sev->ops = ops; + sev->elems = elems; + + mutex_lock(&fh->subscribe_lock); + + spin_lock_irqsave(&fh->vdev->fh_lock, flags); + found_ev = v4l2_event_subscribed(fh, sub->type, sub->id); + if (!found_ev) + list_add(&sev->list, &fh->subscribed); + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); + + if (found_ev) { + /* Already listening */ + kvfree(sev); + } else if (sev->ops && sev->ops->add) { + ret = sev->ops->add(sev, elems); + if (ret) { + spin_lock_irqsave(&fh->vdev->fh_lock, flags); + __v4l2_event_unsubscribe(sev); + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); + kvfree(sev); + } + } + + mutex_unlock(&fh->subscribe_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_event_subscribe); + +void v4l2_event_unsubscribe_all(struct v4l2_fh *fh) +{ + struct v4l2_event_subscription sub; + struct v4l2_subscribed_event *sev; + unsigned long flags; + + do { + sev = NULL; + + spin_lock_irqsave(&fh->vdev->fh_lock, flags); + if (!list_empty(&fh->subscribed)) { + sev = list_first_entry(&fh->subscribed, + struct v4l2_subscribed_event, list); + sub.type = sev->type; + sub.id = sev->id; + } + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); + if (sev) + v4l2_event_unsubscribe(fh, &sub); + } while (sev); +} +EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe_all); + +int v4l2_event_unsubscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub) +{ + struct v4l2_subscribed_event *sev; + unsigned long flags; + + if (sub->type == V4L2_EVENT_ALL) { + v4l2_event_unsubscribe_all(fh); + return 0; + } + + mutex_lock(&fh->subscribe_lock); + + spin_lock_irqsave(&fh->vdev->fh_lock, flags); + + sev = v4l2_event_subscribed(fh, sub->type, sub->id); + if (sev != NULL) + __v4l2_event_unsubscribe(sev); + + spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); + + if (sev && sev->ops && sev->ops->del) + sev->ops->del(sev); + + mutex_unlock(&fh->subscribe_lock); + + kvfree(sev); + + return 0; +} +EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe); + +int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh, + struct v4l2_event_subscription *sub) +{ + return v4l2_event_unsubscribe(fh, sub); +} +EXPORT_SYMBOL_GPL(v4l2_event_subdev_unsubscribe); + +static void v4l2_event_src_replace(struct v4l2_event *old, + const struct v4l2_event *new) +{ + u32 old_changes = old->u.src_change.changes; + + old->u.src_change = new->u.src_change; + old->u.src_change.changes |= old_changes; +} + +static void v4l2_event_src_merge(const struct v4l2_event *old, + struct v4l2_event *new) +{ + new->u.src_change.changes |= old->u.src_change.changes; +} + +static const struct v4l2_subscribed_event_ops v4l2_event_src_ch_ops = { + .replace = v4l2_event_src_replace, + .merge = v4l2_event_src_merge, +}; + +int v4l2_src_change_event_subscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub) +{ + if (sub->type == V4L2_EVENT_SOURCE_CHANGE) + return v4l2_event_subscribe(fh, sub, 0, &v4l2_event_src_ch_ops); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(v4l2_src_change_event_subscribe); + +int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd, + struct v4l2_fh *fh, struct v4l2_event_subscription *sub) +{ + return v4l2_src_change_event_subscribe(fh, sub); +} +EXPORT_SYMBOL_GPL(v4l2_src_change_event_subdev_subscribe); |