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/soc/qcom/smp2p.c | 700 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 700 insertions(+) create mode 100644 drivers/soc/qcom/smp2p.c (limited to 'drivers/soc/qcom/smp2p.c') diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c new file mode 100644 index 000000000..e9c8030d5 --- /dev/null +++ b/drivers/soc/qcom/smp2p.c @@ -0,0 +1,700 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2015, Sony Mobile Communications AB. + * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * The Shared Memory Point to Point (SMP2P) protocol facilitates communication + * of a single 32-bit value between two processors. Each value has a single + * writer (the local side) and a single reader (the remote side). Values are + * uniquely identified in the system by the directed edge (local processor ID + * to remote processor ID) and a string identifier. + * + * Each processor is responsible for creating the outgoing SMEM items and each + * item is writable by the local processor and readable by the remote + * processor. By using two separate SMEM items that are single-reader and + * single-writer, SMP2P does not require any remote locking mechanisms. + * + * The driver uses the Linux GPIO and interrupt framework to expose a virtual + * GPIO for each outbound entry and a virtual interrupt controller for each + * inbound entry. + */ + +#define SMP2P_MAX_ENTRY 16 +#define SMP2P_MAX_ENTRY_NAME 16 + +#define SMP2P_FEATURE_SSR_ACK 0x1 +#define SMP2P_FLAGS_RESTART_DONE_BIT 0 +#define SMP2P_FLAGS_RESTART_ACK_BIT 1 + +#define SMP2P_MAGIC 0x504d5324 +#define SMP2P_ALL_FEATURES SMP2P_FEATURE_SSR_ACK + +/** + * struct smp2p_smem_item - in memory communication structure + * @magic: magic number + * @version: version - must be 1 + * @features: features flag - currently unused + * @local_pid: processor id of sending end + * @remote_pid: processor id of receiving end + * @total_entries: number of entries - always SMP2P_MAX_ENTRY + * @valid_entries: number of allocated entries + * @flags: + * @entries: individual communication entries + * @name: name of the entry + * @value: content of the entry + */ +struct smp2p_smem_item { + u32 magic; + u8 version; + unsigned features:24; + u16 local_pid; + u16 remote_pid; + u16 total_entries; + u16 valid_entries; + u32 flags; + + struct { + u8 name[SMP2P_MAX_ENTRY_NAME]; + u32 value; + } entries[SMP2P_MAX_ENTRY]; +} __packed; + +/** + * struct smp2p_entry - driver context matching one entry + * @node: list entry to keep track of allocated entries + * @smp2p: reference to the device driver context + * @name: name of the entry, to match against smp2p_smem_item + * @value: pointer to smp2p_smem_item entry value + * @last_value: last handled value + * @domain: irq_domain for inbound entries + * @irq_enabled:bitmap to track enabled irq bits + * @irq_rising: bitmap to mark irq bits for rising detection + * @irq_falling:bitmap to mark irq bits for falling detection + * @state: smem state handle + * @lock: spinlock to protect read-modify-write of the value + */ +struct smp2p_entry { + struct list_head node; + struct qcom_smp2p *smp2p; + + const char *name; + u32 *value; + u32 last_value; + + struct irq_domain *domain; + DECLARE_BITMAP(irq_enabled, 32); + DECLARE_BITMAP(irq_rising, 32); + DECLARE_BITMAP(irq_falling, 32); + + struct qcom_smem_state *state; + + spinlock_t lock; +}; + +#define SMP2P_INBOUND 0 +#define SMP2P_OUTBOUND 1 + +/** + * struct qcom_smp2p - device driver context + * @dev: device driver handle + * @in: pointer to the inbound smem item + * @out: pointer to the outbound smem item + * @smem_items: ids of the two smem items + * @valid_entries: already scanned inbound entries + * @ssr_ack_enabled: SMP2P_FEATURE_SSR_ACK feature is supported and was enabled + * @ssr_ack: current cached state of the local ack bit + * @negotiation_done: whether negotiating finished + * @local_pid: processor id of the inbound edge + * @remote_pid: processor id of the outbound edge + * @ipc_regmap: regmap for the outbound ipc + * @ipc_offset: offset within the regmap + * @ipc_bit: bit in regmap@offset to kick to signal remote processor + * @mbox_client: mailbox client handle + * @mbox_chan: apcs ipc mailbox channel handle + * @inbound: list of inbound entries + * @outbound: list of outbound entries + */ +struct qcom_smp2p { + struct device *dev; + + struct smp2p_smem_item *in; + struct smp2p_smem_item *out; + + unsigned smem_items[SMP2P_OUTBOUND + 1]; + + unsigned valid_entries; + + bool ssr_ack_enabled; + bool ssr_ack; + bool negotiation_done; + + unsigned local_pid; + unsigned remote_pid; + + struct regmap *ipc_regmap; + int ipc_offset; + int ipc_bit; + + struct mbox_client mbox_client; + struct mbox_chan *mbox_chan; + + struct list_head inbound; + struct list_head outbound; +}; + +static void qcom_smp2p_kick(struct qcom_smp2p *smp2p) +{ + /* Make sure any updated data is written before the kick */ + wmb(); + + if (smp2p->mbox_chan) { + mbox_send_message(smp2p->mbox_chan, NULL); + mbox_client_txdone(smp2p->mbox_chan, 0); + } else { + regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit)); + } +} + +static bool qcom_smp2p_check_ssr(struct qcom_smp2p *smp2p) +{ + struct smp2p_smem_item *in = smp2p->in; + bool restart; + + if (!smp2p->ssr_ack_enabled) + return false; + + restart = in->flags & BIT(SMP2P_FLAGS_RESTART_DONE_BIT); + + return restart != smp2p->ssr_ack; +} + +static void qcom_smp2p_do_ssr_ack(struct qcom_smp2p *smp2p) +{ + struct smp2p_smem_item *out = smp2p->out; + u32 val; + + smp2p->ssr_ack = !smp2p->ssr_ack; + + val = out->flags & ~BIT(SMP2P_FLAGS_RESTART_ACK_BIT); + if (smp2p->ssr_ack) + val |= BIT(SMP2P_FLAGS_RESTART_ACK_BIT); + out->flags = val; + + qcom_smp2p_kick(smp2p); +} + +static void qcom_smp2p_negotiate(struct qcom_smp2p *smp2p) +{ + struct smp2p_smem_item *out = smp2p->out; + struct smp2p_smem_item *in = smp2p->in; + + if (in->version == out->version) { + out->features &= in->features; + + if (out->features & SMP2P_FEATURE_SSR_ACK) + smp2p->ssr_ack_enabled = true; + + smp2p->negotiation_done = true; + } +} + +static void qcom_smp2p_notify_in(struct qcom_smp2p *smp2p) +{ + struct smp2p_smem_item *in; + struct smp2p_entry *entry; + int irq_pin; + u32 status; + char buf[SMP2P_MAX_ENTRY_NAME]; + u32 val; + int i; + + in = smp2p->in; + + /* Match newly created entries */ + for (i = smp2p->valid_entries; i < in->valid_entries; i++) { + list_for_each_entry(entry, &smp2p->inbound, node) { + memcpy(buf, in->entries[i].name, sizeof(buf)); + if (!strcmp(buf, entry->name)) { + entry->value = &in->entries[i].value; + break; + } + } + } + smp2p->valid_entries = i; + + /* Fire interrupts based on any value changes */ + list_for_each_entry(entry, &smp2p->inbound, node) { + /* Ignore entries not yet allocated by the remote side */ + if (!entry->value) + continue; + + val = readl(entry->value); + + status = val ^ entry->last_value; + entry->last_value = val; + + /* No changes of this entry? */ + if (!status) + continue; + + for_each_set_bit(i, entry->irq_enabled, 32) { + if (!(status & BIT(i))) + continue; + + if ((val & BIT(i) && test_bit(i, entry->irq_rising)) || + (!(val & BIT(i)) && test_bit(i, entry->irq_falling))) { + irq_pin = irq_find_mapping(entry->domain, i); + handle_nested_irq(irq_pin); + } + } + } +} + +/** + * qcom_smp2p_intr() - interrupt handler for incoming notifications + * @irq: unused + * @data: smp2p driver context + * + * Handle notifications from the remote side to handle newly allocated entries + * or any changes to the state bits of existing entries. + */ +static irqreturn_t qcom_smp2p_intr(int irq, void *data) +{ + struct smp2p_smem_item *in; + struct qcom_smp2p *smp2p = data; + unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND]; + unsigned int pid = smp2p->remote_pid; + bool ack_restart; + size_t size; + + in = smp2p->in; + + /* Acquire smem item, if not already found */ + if (!in) { + in = qcom_smem_get(pid, smem_id, &size); + if (IS_ERR(in)) { + dev_err(smp2p->dev, + "Unable to acquire remote smp2p item\n"); + goto out; + } + + smp2p->in = in; + } + + if (!smp2p->negotiation_done) + qcom_smp2p_negotiate(smp2p); + + if (smp2p->negotiation_done) { + ack_restart = qcom_smp2p_check_ssr(smp2p); + qcom_smp2p_notify_in(smp2p); + + if (ack_restart) + qcom_smp2p_do_ssr_ack(smp2p); + } + +out: + return IRQ_HANDLED; +} + +static void smp2p_mask_irq(struct irq_data *irqd) +{ + struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd); + irq_hw_number_t irq = irqd_to_hwirq(irqd); + + clear_bit(irq, entry->irq_enabled); +} + +static void smp2p_unmask_irq(struct irq_data *irqd) +{ + struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd); + irq_hw_number_t irq = irqd_to_hwirq(irqd); + + set_bit(irq, entry->irq_enabled); +} + +static int smp2p_set_irq_type(struct irq_data *irqd, unsigned int type) +{ + struct smp2p_entry *entry = irq_data_get_irq_chip_data(irqd); + irq_hw_number_t irq = irqd_to_hwirq(irqd); + + if (!(type & IRQ_TYPE_EDGE_BOTH)) + return -EINVAL; + + if (type & IRQ_TYPE_EDGE_RISING) + set_bit(irq, entry->irq_rising); + else + clear_bit(irq, entry->irq_rising); + + if (type & IRQ_TYPE_EDGE_FALLING) + set_bit(irq, entry->irq_falling); + else + clear_bit(irq, entry->irq_falling); + + return 0; +} + +static struct irq_chip smp2p_irq_chip = { + .name = "smp2p", + .irq_mask = smp2p_mask_irq, + .irq_unmask = smp2p_unmask_irq, + .irq_set_type = smp2p_set_irq_type, +}; + +static int smp2p_irq_map(struct irq_domain *d, + unsigned int irq, + irq_hw_number_t hw) +{ + struct smp2p_entry *entry = d->host_data; + + irq_set_chip_and_handler(irq, &smp2p_irq_chip, handle_level_irq); + irq_set_chip_data(irq, entry); + irq_set_nested_thread(irq, 1); + irq_set_noprobe(irq); + + return 0; +} + +static const struct irq_domain_ops smp2p_irq_ops = { + .map = smp2p_irq_map, + .xlate = irq_domain_xlate_twocell, +}; + +static int qcom_smp2p_inbound_entry(struct qcom_smp2p *smp2p, + struct smp2p_entry *entry, + struct device_node *node) +{ + entry->domain = irq_domain_add_linear(node, 32, &smp2p_irq_ops, entry); + if (!entry->domain) { + dev_err(smp2p->dev, "failed to add irq_domain\n"); + return -ENOMEM; + } + + return 0; +} + +static int smp2p_update_bits(void *data, u32 mask, u32 value) +{ + struct smp2p_entry *entry = data; + unsigned long flags; + u32 orig; + u32 val; + + spin_lock_irqsave(&entry->lock, flags); + val = orig = readl(entry->value); + val &= ~mask; + val |= value; + writel(val, entry->value); + spin_unlock_irqrestore(&entry->lock, flags); + + if (val != orig) + qcom_smp2p_kick(entry->smp2p); + + return 0; +} + +static const struct qcom_smem_state_ops smp2p_state_ops = { + .update_bits = smp2p_update_bits, +}; + +static int qcom_smp2p_outbound_entry(struct qcom_smp2p *smp2p, + struct smp2p_entry *entry, + struct device_node *node) +{ + struct smp2p_smem_item *out = smp2p->out; + char buf[SMP2P_MAX_ENTRY_NAME] = {}; + + /* Allocate an entry from the smem item */ + strscpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME); + memcpy(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME); + + /* Make the logical entry reference the physical value */ + entry->value = &out->entries[out->valid_entries].value; + + out->valid_entries++; + + entry->state = qcom_smem_state_register(node, &smp2p_state_ops, entry); + if (IS_ERR(entry->state)) { + dev_err(smp2p->dev, "failed to register qcom_smem_state\n"); + return PTR_ERR(entry->state); + } + + return 0; +} + +static int qcom_smp2p_alloc_outbound_item(struct qcom_smp2p *smp2p) +{ + struct smp2p_smem_item *out; + unsigned smem_id = smp2p->smem_items[SMP2P_OUTBOUND]; + unsigned pid = smp2p->remote_pid; + int ret; + + ret = qcom_smem_alloc(pid, smem_id, sizeof(*out)); + if (ret < 0 && ret != -EEXIST) { + if (ret != -EPROBE_DEFER) + dev_err(smp2p->dev, + "unable to allocate local smp2p item\n"); + return ret; + } + + out = qcom_smem_get(pid, smem_id, NULL); + if (IS_ERR(out)) { + dev_err(smp2p->dev, "Unable to acquire local smp2p item\n"); + return PTR_ERR(out); + } + + memset(out, 0, sizeof(*out)); + out->magic = SMP2P_MAGIC; + out->local_pid = smp2p->local_pid; + out->remote_pid = smp2p->remote_pid; + out->total_entries = SMP2P_MAX_ENTRY; + out->valid_entries = 0; + out->features = SMP2P_ALL_FEATURES; + + /* + * Make sure the rest of the header is written before we validate the + * item by writing a valid version number. + */ + wmb(); + out->version = 1; + + qcom_smp2p_kick(smp2p); + + smp2p->out = out; + + return 0; +} + +static int smp2p_parse_ipc(struct qcom_smp2p *smp2p) +{ + struct device_node *syscon; + struct device *dev = smp2p->dev; + const char *key; + int ret; + + syscon = of_parse_phandle(dev->of_node, "qcom,ipc", 0); + if (!syscon) { + dev_err(dev, "no qcom,ipc node\n"); + return -ENODEV; + } + + smp2p->ipc_regmap = syscon_node_to_regmap(syscon); + of_node_put(syscon); + if (IS_ERR(smp2p->ipc_regmap)) + return PTR_ERR(smp2p->ipc_regmap); + + key = "qcom,ipc"; + ret = of_property_read_u32_index(dev->of_node, key, 1, &smp2p->ipc_offset); + if (ret < 0) { + dev_err(dev, "no offset in %s\n", key); + return -EINVAL; + } + + ret = of_property_read_u32_index(dev->of_node, key, 2, &smp2p->ipc_bit); + if (ret < 0) { + dev_err(dev, "no bit in %s\n", key); + return -EINVAL; + } + + return 0; +} + +static int qcom_smp2p_probe(struct platform_device *pdev) +{ + struct smp2p_entry *entry; + struct device_node *node; + struct qcom_smp2p *smp2p; + const char *key; + int irq; + int ret; + + smp2p = devm_kzalloc(&pdev->dev, sizeof(*smp2p), GFP_KERNEL); + if (!smp2p) + return -ENOMEM; + + smp2p->dev = &pdev->dev; + INIT_LIST_HEAD(&smp2p->inbound); + INIT_LIST_HEAD(&smp2p->outbound); + + platform_set_drvdata(pdev, smp2p); + + key = "qcom,smem"; + ret = of_property_read_u32_array(pdev->dev.of_node, key, + smp2p->smem_items, 2); + if (ret) + return ret; + + key = "qcom,local-pid"; + ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->local_pid); + if (ret) + goto report_read_failure; + + key = "qcom,remote-pid"; + ret = of_property_read_u32(pdev->dev.of_node, key, &smp2p->remote_pid); + if (ret) + goto report_read_failure; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + smp2p->mbox_client.dev = &pdev->dev; + smp2p->mbox_client.knows_txdone = true; + smp2p->mbox_chan = mbox_request_channel(&smp2p->mbox_client, 0); + if (IS_ERR(smp2p->mbox_chan)) { + if (PTR_ERR(smp2p->mbox_chan) != -ENODEV) + return PTR_ERR(smp2p->mbox_chan); + + smp2p->mbox_chan = NULL; + + ret = smp2p_parse_ipc(smp2p); + if (ret) + return ret; + } + + ret = qcom_smp2p_alloc_outbound_item(smp2p); + if (ret < 0) + goto release_mbox; + + for_each_available_child_of_node(pdev->dev.of_node, node) { + entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL); + if (!entry) { + ret = -ENOMEM; + of_node_put(node); + goto unwind_interfaces; + } + + entry->smp2p = smp2p; + spin_lock_init(&entry->lock); + + ret = of_property_read_string(node, "qcom,entry-name", &entry->name); + if (ret < 0) { + of_node_put(node); + goto unwind_interfaces; + } + + if (of_property_read_bool(node, "interrupt-controller")) { + ret = qcom_smp2p_inbound_entry(smp2p, entry, node); + if (ret < 0) { + of_node_put(node); + goto unwind_interfaces; + } + + list_add(&entry->node, &smp2p->inbound); + } else { + ret = qcom_smp2p_outbound_entry(smp2p, entry, node); + if (ret < 0) { + of_node_put(node); + goto unwind_interfaces; + } + + list_add(&entry->node, &smp2p->outbound); + } + } + + /* Kick the outgoing edge after allocating entries */ + qcom_smp2p_kick(smp2p); + + ret = devm_request_threaded_irq(&pdev->dev, irq, + NULL, qcom_smp2p_intr, + IRQF_ONESHOT, + "smp2p", (void *)smp2p); + if (ret) { + dev_err(&pdev->dev, "failed to request interrupt\n"); + goto unwind_interfaces; + } + + /* + * Treat smp2p interrupt as wakeup source, but keep it disabled + * by default. User space can decide enabling it depending on its + * use cases. For example if remoteproc crashes and device wants + * to handle it immediatedly (e.g. to not miss phone calls) it can + * enable wakeup source from user space, while other devices which + * do not have proper autosleep feature may want to handle it with + * other wakeup events (e.g. Power button) instead waking up immediately. + */ + device_set_wakeup_capable(&pdev->dev, true); + + ret = dev_pm_set_wake_irq(&pdev->dev, irq); + if (ret) + goto set_wake_irq_fail; + + return 0; + +set_wake_irq_fail: + dev_pm_clear_wake_irq(&pdev->dev); + +unwind_interfaces: + list_for_each_entry(entry, &smp2p->inbound, node) + irq_domain_remove(entry->domain); + + list_for_each_entry(entry, &smp2p->outbound, node) + qcom_smem_state_unregister(entry->state); + + smp2p->out->valid_entries = 0; + +release_mbox: + mbox_free_channel(smp2p->mbox_chan); + + return ret; + +report_read_failure: + dev_err(&pdev->dev, "failed to read %s\n", key); + return -EINVAL; +} + +static int qcom_smp2p_remove(struct platform_device *pdev) +{ + struct qcom_smp2p *smp2p = platform_get_drvdata(pdev); + struct smp2p_entry *entry; + + dev_pm_clear_wake_irq(&pdev->dev); + + list_for_each_entry(entry, &smp2p->inbound, node) + irq_domain_remove(entry->domain); + + list_for_each_entry(entry, &smp2p->outbound, node) + qcom_smem_state_unregister(entry->state); + + mbox_free_channel(smp2p->mbox_chan); + + smp2p->out->valid_entries = 0; + + return 0; +} + +static const struct of_device_id qcom_smp2p_of_match[] = { + { .compatible = "qcom,smp2p" }, + {} +}; +MODULE_DEVICE_TABLE(of, qcom_smp2p_of_match); + +static struct platform_driver qcom_smp2p_driver = { + .probe = qcom_smp2p_probe, + .remove = qcom_smp2p_remove, + .driver = { + .name = "qcom_smp2p", + .of_match_table = qcom_smp2p_of_match, + }, +}; +module_platform_driver(qcom_smp2p_driver); + +MODULE_DESCRIPTION("Qualcomm Shared Memory Point to Point driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3