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/hsi/clients/hsi_char.c | 788 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 788 insertions(+) create mode 100644 drivers/hsi/clients/hsi_char.c (limited to 'drivers/hsi/clients/hsi_char.c') diff --git a/drivers/hsi/clients/hsi_char.c b/drivers/hsi/clients/hsi_char.c new file mode 100644 index 000000000..71ce7dbfe --- /dev/null +++ b/drivers/hsi/clients/hsi_char.c @@ -0,0 +1,788 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HSI character device driver, implements the character device + * interface. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * + * Contact: Andras Domokos + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define HSC_DEVS 16 /* Num of channels */ +#define HSC_MSGS 4 + +#define HSC_RXBREAK 0 + +#define HSC_ID_BITS 6 +#define HSC_PORT_ID_BITS 4 +#define HSC_ID_MASK 3 +#define HSC_PORT_ID_MASK 3 +#define HSC_CH_MASK 0xf + +/* + * We support up to 4 controllers that can have up to 4 + * ports, which should currently be more than enough. + */ +#define HSC_BASEMINOR(id, port_id) \ + ((((id) & HSC_ID_MASK) << HSC_ID_BITS) | \ + (((port_id) & HSC_PORT_ID_MASK) << HSC_PORT_ID_BITS)) + +enum { + HSC_CH_OPEN, + HSC_CH_READ, + HSC_CH_WRITE, + HSC_CH_WLINE, +}; + +enum { + HSC_RX, + HSC_TX, +}; + +struct hsc_client_data; +/** + * struct hsc_channel - hsi_char internal channel data + * @ch: channel number + * @flags: Keeps state of the channel (open/close, reading, writing) + * @free_msgs_list: List of free HSI messages/requests + * @rx_msgs_queue: List of pending RX requests + * @tx_msgs_queue: List of pending TX requests + * @lock: Serialize access to the lists + * @cl: reference to the associated hsi_client + * @cl_data: reference to the client data that this channels belongs to + * @rx_wait: RX requests wait queue + * @tx_wait: TX requests wait queue + */ +struct hsc_channel { + unsigned int ch; + unsigned long flags; + struct list_head free_msgs_list; + struct list_head rx_msgs_queue; + struct list_head tx_msgs_queue; + spinlock_t lock; + struct hsi_client *cl; + struct hsc_client_data *cl_data; + wait_queue_head_t rx_wait; + wait_queue_head_t tx_wait; +}; + +/** + * struct hsc_client_data - hsi_char internal client data + * @cdev: Characther device associated to the hsi_client + * @lock: Lock to serialize open/close access + * @flags: Keeps track of port state (rx hwbreak armed) + * @usecnt: Use count for claiming the HSI port (mutex protected) + * @cl: Referece to the HSI client + * @channels: Array of channels accessible by the client + */ +struct hsc_client_data { + struct cdev cdev; + struct mutex lock; + unsigned long flags; + unsigned int usecnt; + struct hsi_client *cl; + struct hsc_channel channels[HSC_DEVS]; +}; + +/* Stores the major number dynamically allocated for hsi_char */ +static unsigned int hsc_major; +/* Maximum buffer size that hsi_char will accept from userspace */ +static unsigned int max_data_size = 0x1000; +module_param(max_data_size, uint, 0); +MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)"); + +static void hsc_add_tail(struct hsc_channel *channel, struct hsi_msg *msg, + struct list_head *queue) +{ + unsigned long flags; + + spin_lock_irqsave(&channel->lock, flags); + list_add_tail(&msg->link, queue); + spin_unlock_irqrestore(&channel->lock, flags); +} + +static struct hsi_msg *hsc_get_first_msg(struct hsc_channel *channel, + struct list_head *queue) +{ + struct hsi_msg *msg = NULL; + unsigned long flags; + + spin_lock_irqsave(&channel->lock, flags); + + if (list_empty(queue)) + goto out; + + msg = list_first_entry(queue, struct hsi_msg, link); + list_del(&msg->link); +out: + spin_unlock_irqrestore(&channel->lock, flags); + + return msg; +} + +static inline void hsc_msg_free(struct hsi_msg *msg) +{ + kfree(sg_virt(msg->sgt.sgl)); + hsi_free_msg(msg); +} + +static void hsc_free_list(struct list_head *list) +{ + struct hsi_msg *msg, *tmp; + + list_for_each_entry_safe(msg, tmp, list, link) { + list_del(&msg->link); + hsc_msg_free(msg); + } +} + +static void hsc_reset_list(struct hsc_channel *channel, struct list_head *l) +{ + unsigned long flags; + LIST_HEAD(list); + + spin_lock_irqsave(&channel->lock, flags); + list_splice_init(l, &list); + spin_unlock_irqrestore(&channel->lock, flags); + + hsc_free_list(&list); +} + +static inline struct hsi_msg *hsc_msg_alloc(unsigned int alloc_size) +{ + struct hsi_msg *msg; + void *buf; + + msg = hsi_alloc_msg(1, GFP_KERNEL); + if (!msg) + goto out; + buf = kmalloc(alloc_size, GFP_KERNEL); + if (!buf) { + hsi_free_msg(msg); + goto out; + } + sg_init_one(msg->sgt.sgl, buf, alloc_size); + /* Ignore false positive, due to sg pointer handling */ + kmemleak_ignore(buf); + + return msg; +out: + return NULL; +} + +static inline int hsc_msgs_alloc(struct hsc_channel *channel) +{ + struct hsi_msg *msg; + int i; + + for (i = 0; i < HSC_MSGS; i++) { + msg = hsc_msg_alloc(max_data_size); + if (!msg) + goto out; + msg->channel = channel->ch; + list_add_tail(&msg->link, &channel->free_msgs_list); + } + + return 0; +out: + hsc_free_list(&channel->free_msgs_list); + + return -ENOMEM; +} + +static inline unsigned int hsc_msg_len_get(struct hsi_msg *msg) +{ + return msg->sgt.sgl->length; +} + +static inline void hsc_msg_len_set(struct hsi_msg *msg, unsigned int len) +{ + msg->sgt.sgl->length = len; +} + +static void hsc_rx_completed(struct hsi_msg *msg) +{ + struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); + struct hsc_channel *channel = cl_data->channels + msg->channel; + + if (test_bit(HSC_CH_READ, &channel->flags)) { + hsc_add_tail(channel, msg, &channel->rx_msgs_queue); + wake_up(&channel->rx_wait); + } else { + hsc_add_tail(channel, msg, &channel->free_msgs_list); + } +} + +static void hsc_rx_msg_destructor(struct hsi_msg *msg) +{ + msg->status = HSI_STATUS_ERROR; + hsc_msg_len_set(msg, 0); + hsc_rx_completed(msg); +} + +static void hsc_tx_completed(struct hsi_msg *msg) +{ + struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); + struct hsc_channel *channel = cl_data->channels + msg->channel; + + if (test_bit(HSC_CH_WRITE, &channel->flags)) { + hsc_add_tail(channel, msg, &channel->tx_msgs_queue); + wake_up(&channel->tx_wait); + } else { + hsc_add_tail(channel, msg, &channel->free_msgs_list); + } +} + +static void hsc_tx_msg_destructor(struct hsi_msg *msg) +{ + msg->status = HSI_STATUS_ERROR; + hsc_msg_len_set(msg, 0); + hsc_tx_completed(msg); +} + +static void hsc_break_req_destructor(struct hsi_msg *msg) +{ + struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); + + hsi_free_msg(msg); + clear_bit(HSC_RXBREAK, &cl_data->flags); +} + +static void hsc_break_received(struct hsi_msg *msg) +{ + struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); + struct hsc_channel *channel = cl_data->channels; + int i, ret; + + /* Broadcast HWBREAK on all channels */ + for (i = 0; i < HSC_DEVS; i++, channel++) { + struct hsi_msg *msg2; + + if (!test_bit(HSC_CH_READ, &channel->flags)) + continue; + msg2 = hsc_get_first_msg(channel, &channel->free_msgs_list); + if (!msg2) + continue; + clear_bit(HSC_CH_READ, &channel->flags); + hsc_msg_len_set(msg2, 0); + msg2->status = HSI_STATUS_COMPLETED; + hsc_add_tail(channel, msg2, &channel->rx_msgs_queue); + wake_up(&channel->rx_wait); + } + hsi_flush(msg->cl); + ret = hsi_async_read(msg->cl, msg); + if (ret < 0) + hsc_break_req_destructor(msg); +} + +static int hsc_break_request(struct hsi_client *cl) +{ + struct hsc_client_data *cl_data = hsi_client_drvdata(cl); + struct hsi_msg *msg; + int ret; + + if (test_and_set_bit(HSC_RXBREAK, &cl_data->flags)) + return -EBUSY; + + msg = hsi_alloc_msg(0, GFP_KERNEL); + if (!msg) { + clear_bit(HSC_RXBREAK, &cl_data->flags); + return -ENOMEM; + } + msg->break_frame = 1; + msg->complete = hsc_break_received; + msg->destructor = hsc_break_req_destructor; + ret = hsi_async_read(cl, msg); + if (ret < 0) + hsc_break_req_destructor(msg); + + return ret; +} + +static int hsc_break_send(struct hsi_client *cl) +{ + struct hsi_msg *msg; + int ret; + + msg = hsi_alloc_msg(0, GFP_ATOMIC); + if (!msg) + return -ENOMEM; + msg->break_frame = 1; + msg->complete = hsi_free_msg; + msg->destructor = hsi_free_msg; + ret = hsi_async_write(cl, msg); + if (ret < 0) + hsi_free_msg(msg); + + return ret; +} + +static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc) +{ + struct hsi_config tmp; + int ret; + + if ((rxc->mode != HSI_MODE_STREAM) && (rxc->mode != HSI_MODE_FRAME)) + return -EINVAL; + if ((rxc->channels == 0) || (rxc->channels > HSC_DEVS)) + return -EINVAL; + if (rxc->channels & (rxc->channels - 1)) + return -EINVAL; + if ((rxc->flow != HSI_FLOW_SYNC) && (rxc->flow != HSI_FLOW_PIPE)) + return -EINVAL; + tmp = cl->rx_cfg; + cl->rx_cfg.mode = rxc->mode; + cl->rx_cfg.num_hw_channels = rxc->channels; + cl->rx_cfg.flow = rxc->flow; + ret = hsi_setup(cl); + if (ret < 0) { + cl->rx_cfg = tmp; + return ret; + } + if (rxc->mode == HSI_MODE_FRAME) + hsc_break_request(cl); + + return ret; +} + +static inline void hsc_rx_get(struct hsi_client *cl, struct hsc_rx_config *rxc) +{ + rxc->mode = cl->rx_cfg.mode; + rxc->channels = cl->rx_cfg.num_hw_channels; + rxc->flow = cl->rx_cfg.flow; +} + +static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc) +{ + struct hsi_config tmp; + int ret; + + if ((txc->mode != HSI_MODE_STREAM) && (txc->mode != HSI_MODE_FRAME)) + return -EINVAL; + if ((txc->channels == 0) || (txc->channels > HSC_DEVS)) + return -EINVAL; + if (txc->channels & (txc->channels - 1)) + return -EINVAL; + if ((txc->arb_mode != HSI_ARB_RR) && (txc->arb_mode != HSI_ARB_PRIO)) + return -EINVAL; + tmp = cl->tx_cfg; + cl->tx_cfg.mode = txc->mode; + cl->tx_cfg.num_hw_channels = txc->channels; + cl->tx_cfg.speed = txc->speed; + cl->tx_cfg.arb_mode = txc->arb_mode; + ret = hsi_setup(cl); + if (ret < 0) { + cl->tx_cfg = tmp; + return ret; + } + + return ret; +} + +static inline void hsc_tx_get(struct hsi_client *cl, struct hsc_tx_config *txc) +{ + txc->mode = cl->tx_cfg.mode; + txc->channels = cl->tx_cfg.num_hw_channels; + txc->speed = cl->tx_cfg.speed; + txc->arb_mode = cl->tx_cfg.arb_mode; +} + +static ssize_t hsc_read(struct file *file, char __user *buf, size_t len, + loff_t *ppos __maybe_unused) +{ + struct hsc_channel *channel = file->private_data; + struct hsi_msg *msg; + ssize_t ret; + + if (len == 0) + return 0; + if (!IS_ALIGNED(len, sizeof(u32))) + return -EINVAL; + if (len > max_data_size) + len = max_data_size; + if (channel->ch >= channel->cl->rx_cfg.num_hw_channels) + return -ECHRNG; + if (test_and_set_bit(HSC_CH_READ, &channel->flags)) + return -EBUSY; + msg = hsc_get_first_msg(channel, &channel->free_msgs_list); + if (!msg) { + ret = -ENOSPC; + goto out; + } + hsc_msg_len_set(msg, len); + msg->complete = hsc_rx_completed; + msg->destructor = hsc_rx_msg_destructor; + ret = hsi_async_read(channel->cl, msg); + if (ret < 0) { + hsc_add_tail(channel, msg, &channel->free_msgs_list); + goto out; + } + + ret = wait_event_interruptible(channel->rx_wait, + !list_empty(&channel->rx_msgs_queue)); + if (ret < 0) { + clear_bit(HSC_CH_READ, &channel->flags); + hsi_flush(channel->cl); + return -EINTR; + } + + msg = hsc_get_first_msg(channel, &channel->rx_msgs_queue); + if (msg) { + if (msg->status != HSI_STATUS_ERROR) { + ret = copy_to_user((void __user *)buf, + sg_virt(msg->sgt.sgl), hsc_msg_len_get(msg)); + if (ret) + ret = -EFAULT; + else + ret = hsc_msg_len_get(msg); + } else { + ret = -EIO; + } + hsc_add_tail(channel, msg, &channel->free_msgs_list); + } +out: + clear_bit(HSC_CH_READ, &channel->flags); + + return ret; +} + +static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len, + loff_t *ppos __maybe_unused) +{ + struct hsc_channel *channel = file->private_data; + struct hsi_msg *msg; + ssize_t ret; + + if ((len == 0) || !IS_ALIGNED(len, sizeof(u32))) + return -EINVAL; + if (len > max_data_size) + len = max_data_size; + if (channel->ch >= channel->cl->tx_cfg.num_hw_channels) + return -ECHRNG; + if (test_and_set_bit(HSC_CH_WRITE, &channel->flags)) + return -EBUSY; + msg = hsc_get_first_msg(channel, &channel->free_msgs_list); + if (!msg) { + clear_bit(HSC_CH_WRITE, &channel->flags); + return -ENOSPC; + } + if (copy_from_user(sg_virt(msg->sgt.sgl), (void __user *)buf, len)) { + ret = -EFAULT; + goto out; + } + hsc_msg_len_set(msg, len); + msg->complete = hsc_tx_completed; + msg->destructor = hsc_tx_msg_destructor; + ret = hsi_async_write(channel->cl, msg); + if (ret < 0) + goto out; + + ret = wait_event_interruptible(channel->tx_wait, + !list_empty(&channel->tx_msgs_queue)); + if (ret < 0) { + clear_bit(HSC_CH_WRITE, &channel->flags); + hsi_flush(channel->cl); + return -EINTR; + } + + msg = hsc_get_first_msg(channel, &channel->tx_msgs_queue); + if (msg) { + if (msg->status == HSI_STATUS_ERROR) + ret = -EIO; + else + ret = hsc_msg_len_get(msg); + + hsc_add_tail(channel, msg, &channel->free_msgs_list); + } +out: + clear_bit(HSC_CH_WRITE, &channel->flags); + + return ret; +} + +static long hsc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct hsc_channel *channel = file->private_data; + unsigned int state; + struct hsc_rx_config rxc; + struct hsc_tx_config txc; + long ret = 0; + + switch (cmd) { + case HSC_RESET: + hsi_flush(channel->cl); + break; + case HSC_SET_PM: + if (copy_from_user(&state, (void __user *)arg, sizeof(state))) + return -EFAULT; + if (state == HSC_PM_DISABLE) { + if (test_and_set_bit(HSC_CH_WLINE, &channel->flags)) + return -EINVAL; + ret = hsi_start_tx(channel->cl); + } else if (state == HSC_PM_ENABLE) { + if (!test_and_clear_bit(HSC_CH_WLINE, &channel->flags)) + return -EINVAL; + ret = hsi_stop_tx(channel->cl); + } else { + ret = -EINVAL; + } + break; + case HSC_SEND_BREAK: + return hsc_break_send(channel->cl); + case HSC_SET_RX: + if (copy_from_user(&rxc, (void __user *)arg, sizeof(rxc))) + return -EFAULT; + return hsc_rx_set(channel->cl, &rxc); + case HSC_GET_RX: + hsc_rx_get(channel->cl, &rxc); + if (copy_to_user((void __user *)arg, &rxc, sizeof(rxc))) + return -EFAULT; + break; + case HSC_SET_TX: + if (copy_from_user(&txc, (void __user *)arg, sizeof(txc))) + return -EFAULT; + return hsc_tx_set(channel->cl, &txc); + case HSC_GET_TX: + hsc_tx_get(channel->cl, &txc); + if (copy_to_user((void __user *)arg, &txc, sizeof(txc))) + return -EFAULT; + break; + default: + return -ENOIOCTLCMD; + } + + return ret; +} + +static inline void __hsc_port_release(struct hsc_client_data *cl_data) +{ + BUG_ON(cl_data->usecnt == 0); + + if (--cl_data->usecnt == 0) { + hsi_flush(cl_data->cl); + hsi_release_port(cl_data->cl); + } +} + +static int hsc_open(struct inode *inode, struct file *file) +{ + struct hsc_client_data *cl_data; + struct hsc_channel *channel; + int ret = 0; + + pr_debug("open, minor = %d\n", iminor(inode)); + + cl_data = container_of(inode->i_cdev, struct hsc_client_data, cdev); + mutex_lock(&cl_data->lock); + channel = cl_data->channels + (iminor(inode) & HSC_CH_MASK); + + if (test_and_set_bit(HSC_CH_OPEN, &channel->flags)) { + ret = -EBUSY; + goto out; + } + /* + * Check if we have already claimed the port associated to the HSI + * client. If not then try to claim it, else increase its refcount + */ + if (cl_data->usecnt == 0) { + ret = hsi_claim_port(cl_data->cl, 0); + if (ret < 0) + goto out; + hsi_setup(cl_data->cl); + } + cl_data->usecnt++; + + ret = hsc_msgs_alloc(channel); + if (ret < 0) { + __hsc_port_release(cl_data); + goto out; + } + + file->private_data = channel; + mutex_unlock(&cl_data->lock); + + return ret; +out: + mutex_unlock(&cl_data->lock); + + return ret; +} + +static int hsc_release(struct inode *inode __maybe_unused, struct file *file) +{ + struct hsc_channel *channel = file->private_data; + struct hsc_client_data *cl_data = channel->cl_data; + + mutex_lock(&cl_data->lock); + file->private_data = NULL; + if (test_and_clear_bit(HSC_CH_WLINE, &channel->flags)) + hsi_stop_tx(channel->cl); + __hsc_port_release(cl_data); + hsc_reset_list(channel, &channel->rx_msgs_queue); + hsc_reset_list(channel, &channel->tx_msgs_queue); + hsc_reset_list(channel, &channel->free_msgs_list); + clear_bit(HSC_CH_READ, &channel->flags); + clear_bit(HSC_CH_WRITE, &channel->flags); + clear_bit(HSC_CH_OPEN, &channel->flags); + wake_up(&channel->rx_wait); + wake_up(&channel->tx_wait); + mutex_unlock(&cl_data->lock); + + return 0; +} + +static const struct file_operations hsc_fops = { + .owner = THIS_MODULE, + .read = hsc_read, + .write = hsc_write, + .unlocked_ioctl = hsc_ioctl, + .open = hsc_open, + .release = hsc_release, +}; + +static void hsc_channel_init(struct hsc_channel *channel) +{ + init_waitqueue_head(&channel->rx_wait); + init_waitqueue_head(&channel->tx_wait); + spin_lock_init(&channel->lock); + INIT_LIST_HEAD(&channel->free_msgs_list); + INIT_LIST_HEAD(&channel->rx_msgs_queue); + INIT_LIST_HEAD(&channel->tx_msgs_queue); +} + +static int hsc_probe(struct device *dev) +{ + const char devname[] = "hsi_char"; + struct hsc_client_data *cl_data; + struct hsc_channel *channel; + struct hsi_client *cl = to_hsi_client(dev); + unsigned int hsc_baseminor; + dev_t hsc_dev; + int ret; + int i; + + cl_data = kzalloc(sizeof(*cl_data), GFP_KERNEL); + if (!cl_data) + return -ENOMEM; + + hsc_baseminor = HSC_BASEMINOR(hsi_id(cl), hsi_port_id(cl)); + if (!hsc_major) { + ret = alloc_chrdev_region(&hsc_dev, hsc_baseminor, + HSC_DEVS, devname); + if (ret == 0) + hsc_major = MAJOR(hsc_dev); + } else { + hsc_dev = MKDEV(hsc_major, hsc_baseminor); + ret = register_chrdev_region(hsc_dev, HSC_DEVS, devname); + } + if (ret < 0) { + dev_err(dev, "Device %s allocation failed %d\n", + hsc_major ? "minor" : "major", ret); + goto out1; + } + mutex_init(&cl_data->lock); + hsi_client_set_drvdata(cl, cl_data); + cdev_init(&cl_data->cdev, &hsc_fops); + cl_data->cdev.owner = THIS_MODULE; + cl_data->cl = cl; + for (i = 0, channel = cl_data->channels; i < HSC_DEVS; i++, channel++) { + hsc_channel_init(channel); + channel->ch = i; + channel->cl = cl; + channel->cl_data = cl_data; + } + + /* 1 hsi client -> N char devices (one for each channel) */ + ret = cdev_add(&cl_data->cdev, hsc_dev, HSC_DEVS); + if (ret) { + dev_err(dev, "Could not add char device %d\n", ret); + goto out2; + } + + return 0; +out2: + unregister_chrdev_region(hsc_dev, HSC_DEVS); +out1: + kfree(cl_data); + + return ret; +} + +static int hsc_remove(struct device *dev) +{ + struct hsi_client *cl = to_hsi_client(dev); + struct hsc_client_data *cl_data = hsi_client_drvdata(cl); + dev_t hsc_dev = cl_data->cdev.dev; + + cdev_del(&cl_data->cdev); + unregister_chrdev_region(hsc_dev, HSC_DEVS); + hsi_client_set_drvdata(cl, NULL); + kfree(cl_data); + + return 0; +} + +static struct hsi_client_driver hsc_driver = { + .driver = { + .name = "hsi_char", + .owner = THIS_MODULE, + .probe = hsc_probe, + .remove = hsc_remove, + }, +}; + +static int __init hsc_init(void) +{ + int ret; + + if ((max_data_size < 4) || (max_data_size > 0x10000) || + (max_data_size & (max_data_size - 1))) { + pr_err("Invalid max read/write data size\n"); + return -EINVAL; + } + + ret = hsi_register_client_driver(&hsc_driver); + if (ret) { + pr_err("Error while registering HSI/SSI driver %d\n", ret); + return ret; + } + + pr_info("HSI/SSI char device loaded\n"); + + return 0; +} +module_init(hsc_init); + +static void __exit hsc_exit(void) +{ + hsi_unregister_client_driver(&hsc_driver); + pr_info("HSI char device removed\n"); +} +module_exit(hsc_exit); + +MODULE_AUTHOR("Andras Domokos "); +MODULE_ALIAS("hsi:hsi_char"); +MODULE_DESCRIPTION("HSI character device"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3