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/misc/ocxl/context.c | 296 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 296 insertions(+) create mode 100644 drivers/misc/ocxl/context.c (limited to 'drivers/misc/ocxl/context.c') diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c new file mode 100644 index 000000000..9eb0d93b0 --- /dev/null +++ b/drivers/misc/ocxl/context.c @@ -0,0 +1,296 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2017 IBM Corp. +#include +#include "trace.h" +#include "ocxl_internal.h" + +int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu, + struct address_space *mapping) +{ + int pasid; + struct ocxl_context *ctx; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->afu = afu; + mutex_lock(&afu->contexts_lock); + pasid = idr_alloc(&afu->contexts_idr, ctx, afu->pasid_base, + afu->pasid_base + afu->pasid_max, GFP_KERNEL); + if (pasid < 0) { + mutex_unlock(&afu->contexts_lock); + kfree(ctx); + return pasid; + } + afu->pasid_count++; + mutex_unlock(&afu->contexts_lock); + + ctx->pasid = pasid; + ctx->status = OPENED; + mutex_init(&ctx->status_mutex); + ctx->mapping = mapping; + mutex_init(&ctx->mapping_lock); + init_waitqueue_head(&ctx->events_wq); + mutex_init(&ctx->xsl_error_lock); + mutex_init(&ctx->irq_lock); + idr_init(&ctx->irq_idr); + ctx->tidr = 0; + + /* + * Keep a reference on the AFU to make sure it's valid for the + * duration of the life of the context + */ + ocxl_afu_get(afu); + *context = ctx; + return 0; +} +EXPORT_SYMBOL_GPL(ocxl_context_alloc); + +/* + * Callback for when a translation fault triggers an error + * data: a pointer to the context which triggered the fault + * addr: the address that triggered the error + * dsisr: the value of the PPC64 dsisr register + */ +static void xsl_fault_error(void *data, u64 addr, u64 dsisr) +{ + struct ocxl_context *ctx = (struct ocxl_context *) data; + + mutex_lock(&ctx->xsl_error_lock); + ctx->xsl_error.addr = addr; + ctx->xsl_error.dsisr = dsisr; + ctx->xsl_error.count++; + mutex_unlock(&ctx->xsl_error_lock); + + wake_up_all(&ctx->events_wq); +} + +int ocxl_context_attach(struct ocxl_context *ctx, u64 amr, struct mm_struct *mm) +{ + int rc; + unsigned long pidr = 0; + struct pci_dev *dev; + + // Locks both status & tidr + mutex_lock(&ctx->status_mutex); + if (ctx->status != OPENED) { + rc = -EIO; + goto out; + } + + if (mm) + pidr = mm->context.id; + + dev = to_pci_dev(ctx->afu->fn->dev.parent); + rc = ocxl_link_add_pe(ctx->afu->fn->link, ctx->pasid, pidr, ctx->tidr, + amr, pci_dev_id(dev), mm, xsl_fault_error, ctx); + if (rc) + goto out; + + ctx->status = ATTACHED; +out: + mutex_unlock(&ctx->status_mutex); + return rc; +} +EXPORT_SYMBOL_GPL(ocxl_context_attach); + +static vm_fault_t map_afu_irq(struct vm_area_struct *vma, unsigned long address, + u64 offset, struct ocxl_context *ctx) +{ + u64 trigger_addr; + int irq_id = ocxl_irq_offset_to_id(ctx, offset); + + trigger_addr = ocxl_afu_irq_get_addr(ctx, irq_id); + if (!trigger_addr) + return VM_FAULT_SIGBUS; + + return vmf_insert_pfn(vma, address, trigger_addr >> PAGE_SHIFT); +} + +static vm_fault_t map_pp_mmio(struct vm_area_struct *vma, unsigned long address, + u64 offset, struct ocxl_context *ctx) +{ + u64 pp_mmio_addr; + int pasid_off; + vm_fault_t ret; + + if (offset >= ctx->afu->config.pp_mmio_stride) + return VM_FAULT_SIGBUS; + + mutex_lock(&ctx->status_mutex); + if (ctx->status != ATTACHED) { + mutex_unlock(&ctx->status_mutex); + pr_debug("%s: Context not attached, failing mmio mmap\n", + __func__); + return VM_FAULT_SIGBUS; + } + + pasid_off = ctx->pasid - ctx->afu->pasid_base; + pp_mmio_addr = ctx->afu->pp_mmio_start + + pasid_off * ctx->afu->config.pp_mmio_stride + + offset; + + ret = vmf_insert_pfn(vma, address, pp_mmio_addr >> PAGE_SHIFT); + mutex_unlock(&ctx->status_mutex); + return ret; +} + +static vm_fault_t ocxl_mmap_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct ocxl_context *ctx = vma->vm_file->private_data; + u64 offset; + vm_fault_t ret; + + offset = vmf->pgoff << PAGE_SHIFT; + pr_debug("%s: pasid %d address 0x%lx offset 0x%llx\n", __func__, + ctx->pasid, vmf->address, offset); + + if (offset < ctx->afu->irq_base_offset) + ret = map_pp_mmio(vma, vmf->address, offset, ctx); + else + ret = map_afu_irq(vma, vmf->address, offset, ctx); + return ret; +} + +static const struct vm_operations_struct ocxl_vmops = { + .fault = ocxl_mmap_fault, +}; + +static int check_mmap_afu_irq(struct ocxl_context *ctx, + struct vm_area_struct *vma) +{ + int irq_id = ocxl_irq_offset_to_id(ctx, vma->vm_pgoff << PAGE_SHIFT); + + /* only one page */ + if (vma_pages(vma) != 1) + return -EINVAL; + + /* check offset validty */ + if (!ocxl_afu_irq_get_addr(ctx, irq_id)) + return -EINVAL; + + /* + * trigger page should only be accessible in write mode. + * + * It's a bit theoretical, as a page mmaped with only + * PROT_WRITE is currently readable, but it doesn't hurt. + */ + if ((vma->vm_flags & VM_READ) || (vma->vm_flags & VM_EXEC) || + !(vma->vm_flags & VM_WRITE)) + return -EINVAL; + vma->vm_flags &= ~(VM_MAYREAD | VM_MAYEXEC); + return 0; +} + +static int check_mmap_mmio(struct ocxl_context *ctx, + struct vm_area_struct *vma) +{ + if ((vma_pages(vma) + vma->vm_pgoff) > + (ctx->afu->config.pp_mmio_stride >> PAGE_SHIFT)) + return -EINVAL; + return 0; +} + +int ocxl_context_mmap(struct ocxl_context *ctx, struct vm_area_struct *vma) +{ + int rc; + + if ((vma->vm_pgoff << PAGE_SHIFT) < ctx->afu->irq_base_offset) + rc = check_mmap_mmio(ctx, vma); + else + rc = check_mmap_afu_irq(ctx, vma); + if (rc) + return rc; + + vma->vm_flags |= VM_IO | VM_PFNMAP; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + vma->vm_ops = &ocxl_vmops; + return 0; +} + +int ocxl_context_detach(struct ocxl_context *ctx) +{ + struct pci_dev *dev; + int afu_control_pos; + enum ocxl_context_status status; + int rc; + + mutex_lock(&ctx->status_mutex); + status = ctx->status; + ctx->status = CLOSED; + mutex_unlock(&ctx->status_mutex); + if (status != ATTACHED) + return 0; + + dev = to_pci_dev(ctx->afu->fn->dev.parent); + afu_control_pos = ctx->afu->config.dvsec_afu_control_pos; + + mutex_lock(&ctx->afu->afu_control_lock); + rc = ocxl_config_terminate_pasid(dev, afu_control_pos, ctx->pasid); + mutex_unlock(&ctx->afu->afu_control_lock); + trace_ocxl_terminate_pasid(ctx->pasid, rc); + if (rc) { + /* + * If we timeout waiting for the AFU to terminate the + * pasid, then it's dangerous to clean up the Process + * Element entry in the SPA, as it may be referenced + * in the future by the AFU. In which case, we would + * checkstop because of an invalid PE access (FIR + * register 2, bit 42). So leave the PE + * defined. Caller shouldn't free the context so that + * PASID remains allocated. + * + * A link reset will be required to cleanup the AFU + * and the SPA. + */ + if (rc == -EBUSY) + return rc; + } + rc = ocxl_link_remove_pe(ctx->afu->fn->link, ctx->pasid); + if (rc) { + dev_warn(&dev->dev, + "Couldn't remove PE entry cleanly: %d\n", rc); + } + return 0; +} +EXPORT_SYMBOL_GPL(ocxl_context_detach); + +void ocxl_context_detach_all(struct ocxl_afu *afu) +{ + struct ocxl_context *ctx; + int tmp; + + mutex_lock(&afu->contexts_lock); + idr_for_each_entry(&afu->contexts_idr, ctx, tmp) { + ocxl_context_detach(ctx); + /* + * We are force detaching - remove any active mmio + * mappings so userspace cannot interfere with the + * card if it comes back. Easiest way to exercise + * this is to unbind and rebind the driver via sysfs + * while it is in use. + */ + mutex_lock(&ctx->mapping_lock); + if (ctx->mapping) + unmap_mapping_range(ctx->mapping, 0, 0, 1); + mutex_unlock(&ctx->mapping_lock); + } + mutex_unlock(&afu->contexts_lock); +} + +void ocxl_context_free(struct ocxl_context *ctx) +{ + mutex_lock(&ctx->afu->contexts_lock); + ctx->afu->pasid_count--; + idr_remove(&ctx->afu->contexts_idr, ctx->pasid); + mutex_unlock(&ctx->afu->contexts_lock); + + ocxl_afu_irq_free_all(ctx); + idr_destroy(&ctx->irq_idr); + /* reference to the AFU taken in ocxl_context_alloc() */ + ocxl_afu_put(ctx->afu); + kfree(ctx); +} +EXPORT_SYMBOL_GPL(ocxl_context_free); -- cgit v1.2.3