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(). ... --- arch/powerpc/mm/book3s64/iommu_api.c | 402 +++++++++++++++++++++++++++++++++++ 1 file changed, 402 insertions(+) create mode 100644 arch/powerpc/mm/book3s64/iommu_api.c (limited to 'arch/powerpc/mm/book3s64/iommu_api.c') diff --git a/arch/powerpc/mm/book3s64/iommu_api.c b/arch/powerpc/mm/book3s64/iommu_api.c new file mode 100644 index 000000000..7fcfba162 --- /dev/null +++ b/arch/powerpc/mm/book3s64/iommu_api.c @@ -0,0 +1,402 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IOMMU helpers in MMU context. + * + * Copyright (C) 2015 IBM Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static DEFINE_MUTEX(mem_list_mutex); + +#define MM_IOMMU_TABLE_GROUP_PAGE_DIRTY 0x1 +#define MM_IOMMU_TABLE_GROUP_PAGE_MASK ~(SZ_4K - 1) + +struct mm_iommu_table_group_mem_t { + struct list_head next; + struct rcu_head rcu; + unsigned long used; + atomic64_t mapped; + unsigned int pageshift; + u64 ua; /* userspace address */ + u64 entries; /* number of entries in hpas/hpages[] */ + /* + * in mm_iommu_get we temporarily use this to store + * struct page address. + * + * We need to convert ua to hpa in real mode. Make it + * simpler by storing physical address. + */ + union { + struct page **hpages; /* vmalloc'ed */ + phys_addr_t *hpas; + }; +#define MM_IOMMU_TABLE_INVALID_HPA ((uint64_t)-1) + u64 dev_hpa; /* Device memory base address */ +}; + +bool mm_iommu_preregistered(struct mm_struct *mm) +{ + return !list_empty(&mm->context.iommu_group_mem_list); +} +EXPORT_SYMBOL_GPL(mm_iommu_preregistered); + +static long mm_iommu_do_alloc(struct mm_struct *mm, unsigned long ua, + unsigned long entries, unsigned long dev_hpa, + struct mm_iommu_table_group_mem_t **pmem) +{ + struct mm_iommu_table_group_mem_t *mem, *mem2; + long i, ret, locked_entries = 0, pinned = 0; + unsigned int pageshift; + unsigned long entry, chunk; + + if (dev_hpa == MM_IOMMU_TABLE_INVALID_HPA) { + ret = account_locked_vm(mm, entries, true); + if (ret) + return ret; + + locked_entries = entries; + } + + mem = kzalloc(sizeof(*mem), GFP_KERNEL); + if (!mem) { + ret = -ENOMEM; + goto unlock_exit; + } + + if (dev_hpa != MM_IOMMU_TABLE_INVALID_HPA) { + mem->pageshift = __ffs(dev_hpa | (entries << PAGE_SHIFT)); + mem->dev_hpa = dev_hpa; + goto good_exit; + } + mem->dev_hpa = MM_IOMMU_TABLE_INVALID_HPA; + + /* + * For a starting point for a maximum page size calculation + * we use @ua and @entries natural alignment to allow IOMMU pages + * smaller than huge pages but still bigger than PAGE_SIZE. + */ + mem->pageshift = __ffs(ua | (entries << PAGE_SHIFT)); + mem->hpas = vzalloc(array_size(entries, sizeof(mem->hpas[0]))); + if (!mem->hpas) { + kfree(mem); + ret = -ENOMEM; + goto unlock_exit; + } + + mmap_read_lock(mm); + chunk = (1UL << (PAGE_SHIFT + MAX_ORDER - 1)) / + sizeof(struct vm_area_struct *); + chunk = min(chunk, entries); + for (entry = 0; entry < entries; entry += chunk) { + unsigned long n = min(entries - entry, chunk); + + ret = pin_user_pages(ua + (entry << PAGE_SHIFT), n, + FOLL_WRITE | FOLL_LONGTERM, + mem->hpages + entry, NULL); + if (ret == n) { + pinned += n; + continue; + } + if (ret > 0) + pinned += ret; + break; + } + mmap_read_unlock(mm); + if (pinned != entries) { + if (!ret) + ret = -EFAULT; + goto free_exit; + } + +good_exit: + atomic64_set(&mem->mapped, 1); + mem->used = 1; + mem->ua = ua; + mem->entries = entries; + + mutex_lock(&mem_list_mutex); + + list_for_each_entry_rcu(mem2, &mm->context.iommu_group_mem_list, next, + lockdep_is_held(&mem_list_mutex)) { + /* Overlap? */ + if ((mem2->ua < (ua + (entries << PAGE_SHIFT))) && + (ua < (mem2->ua + + (mem2->entries << PAGE_SHIFT)))) { + ret = -EINVAL; + mutex_unlock(&mem_list_mutex); + goto free_exit; + } + } + + if (mem->dev_hpa == MM_IOMMU_TABLE_INVALID_HPA) { + /* + * Allow to use larger than 64k IOMMU pages. Only do that + * if we are backed by hugetlb. Skip device memory as it is not + * backed with page structs. + */ + pageshift = PAGE_SHIFT; + for (i = 0; i < entries; ++i) { + struct page *page = mem->hpages[i]; + + if ((mem->pageshift > PAGE_SHIFT) && PageHuge(page)) + pageshift = page_shift(compound_head(page)); + mem->pageshift = min(mem->pageshift, pageshift); + /* + * We don't need struct page reference any more, switch + * to physical address. + */ + mem->hpas[i] = page_to_pfn(page) << PAGE_SHIFT; + } + } + + list_add_rcu(&mem->next, &mm->context.iommu_group_mem_list); + + mutex_unlock(&mem_list_mutex); + + *pmem = mem; + + return 0; + +free_exit: + /* free the references taken */ + unpin_user_pages(mem->hpages, pinned); + + vfree(mem->hpas); + kfree(mem); + +unlock_exit: + account_locked_vm(mm, locked_entries, false); + + return ret; +} + +long mm_iommu_new(struct mm_struct *mm, unsigned long ua, unsigned long entries, + struct mm_iommu_table_group_mem_t **pmem) +{ + return mm_iommu_do_alloc(mm, ua, entries, MM_IOMMU_TABLE_INVALID_HPA, + pmem); +} +EXPORT_SYMBOL_GPL(mm_iommu_new); + +long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua, + unsigned long entries, unsigned long dev_hpa, + struct mm_iommu_table_group_mem_t **pmem) +{ + return mm_iommu_do_alloc(mm, ua, entries, dev_hpa, pmem); +} +EXPORT_SYMBOL_GPL(mm_iommu_newdev); + +static void mm_iommu_unpin(struct mm_iommu_table_group_mem_t *mem) +{ + long i; + struct page *page = NULL; + + if (!mem->hpas) + return; + + for (i = 0; i < mem->entries; ++i) { + if (!mem->hpas[i]) + continue; + + page = pfn_to_page(mem->hpas[i] >> PAGE_SHIFT); + if (!page) + continue; + + if (mem->hpas[i] & MM_IOMMU_TABLE_GROUP_PAGE_DIRTY) + SetPageDirty(page); + + unpin_user_page(page); + + mem->hpas[i] = 0; + } +} + +static void mm_iommu_do_free(struct mm_iommu_table_group_mem_t *mem) +{ + + mm_iommu_unpin(mem); + vfree(mem->hpas); + kfree(mem); +} + +static void mm_iommu_free(struct rcu_head *head) +{ + struct mm_iommu_table_group_mem_t *mem = container_of(head, + struct mm_iommu_table_group_mem_t, rcu); + + mm_iommu_do_free(mem); +} + +static void mm_iommu_release(struct mm_iommu_table_group_mem_t *mem) +{ + list_del_rcu(&mem->next); + call_rcu(&mem->rcu, mm_iommu_free); +} + +long mm_iommu_put(struct mm_struct *mm, struct mm_iommu_table_group_mem_t *mem) +{ + long ret = 0; + unsigned long unlock_entries = 0; + + mutex_lock(&mem_list_mutex); + + if (mem->used == 0) { + ret = -ENOENT; + goto unlock_exit; + } + + --mem->used; + /* There are still users, exit */ + if (mem->used) + goto unlock_exit; + + /* Are there still mappings? */ + if (atomic64_cmpxchg(&mem->mapped, 1, 0) != 1) { + ++mem->used; + ret = -EBUSY; + goto unlock_exit; + } + + if (mem->dev_hpa == MM_IOMMU_TABLE_INVALID_HPA) + unlock_entries = mem->entries; + + /* @mapped became 0 so now mappings are disabled, release the region */ + mm_iommu_release(mem); + +unlock_exit: + mutex_unlock(&mem_list_mutex); + + account_locked_vm(mm, unlock_entries, false); + + return ret; +} +EXPORT_SYMBOL_GPL(mm_iommu_put); + +struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, + unsigned long ua, unsigned long size) +{ + struct mm_iommu_table_group_mem_t *mem, *ret = NULL; + + rcu_read_lock(); + list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list, next) { + if ((mem->ua <= ua) && + (ua + size <= mem->ua + + (mem->entries << PAGE_SHIFT))) { + ret = mem; + break; + } + } + rcu_read_unlock(); + + return ret; +} +EXPORT_SYMBOL_GPL(mm_iommu_lookup); + +struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm, + unsigned long ua, unsigned long entries) +{ + struct mm_iommu_table_group_mem_t *mem, *ret = NULL; + + mutex_lock(&mem_list_mutex); + + list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list, next, + lockdep_is_held(&mem_list_mutex)) { + if ((mem->ua == ua) && (mem->entries == entries)) { + ret = mem; + ++mem->used; + break; + } + } + + mutex_unlock(&mem_list_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(mm_iommu_get); + +long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, + unsigned long ua, unsigned int pageshift, unsigned long *hpa) +{ + const long entry = (ua - mem->ua) >> PAGE_SHIFT; + u64 *va; + + if (entry >= mem->entries) + return -EFAULT; + + if (pageshift > mem->pageshift) + return -EFAULT; + + if (!mem->hpas) { + *hpa = mem->dev_hpa + (ua - mem->ua); + return 0; + } + + va = &mem->hpas[entry]; + *hpa = (*va & MM_IOMMU_TABLE_GROUP_PAGE_MASK) | (ua & ~PAGE_MASK); + + return 0; +} +EXPORT_SYMBOL_GPL(mm_iommu_ua_to_hpa); + +bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, + unsigned int pageshift, unsigned long *size) +{ + struct mm_iommu_table_group_mem_t *mem; + unsigned long end; + + rcu_read_lock(); + list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list, next) { + if (mem->dev_hpa == MM_IOMMU_TABLE_INVALID_HPA) + continue; + + end = mem->dev_hpa + (mem->entries << PAGE_SHIFT); + if ((mem->dev_hpa <= hpa) && (hpa < end)) { + /* + * Since the IOMMU page size might be bigger than + * PAGE_SIZE, the amount of preregistered memory + * starting from @hpa might be smaller than 1<mapped)) + return 0; + + /* Last mm_iommu_put() has been called, no more mappings allowed() */ + return -ENXIO; +} +EXPORT_SYMBOL_GPL(mm_iommu_mapped_inc); + +void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem) +{ + atomic64_add_unless(&mem->mapped, -1, 1); +} +EXPORT_SYMBOL_GPL(mm_iommu_mapped_dec); + +void mm_iommu_init(struct mm_struct *mm) +{ + INIT_LIST_HEAD_RCU(&mm->context.iommu_group_mem_list); +} -- cgit v1.2.3