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/include/asm/cmpxchg.h | 760 +++++++++++++++++++++++++++++++++++++ 1 file changed, 760 insertions(+) create mode 100644 arch/powerpc/include/asm/cmpxchg.h (limited to 'arch/powerpc/include/asm/cmpxchg.h') diff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h new file mode 100644 index 000000000..d0ea0571e --- /dev/null +++ b/arch/powerpc/include/asm/cmpxchg.h @@ -0,0 +1,760 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_CMPXCHG_H_ +#define _ASM_POWERPC_CMPXCHG_H_ + +#ifdef __KERNEL__ +#include +#include +#include + +#ifdef __BIG_ENDIAN +#define BITOFF_CAL(size, off) ((sizeof(u32) - size - off) * BITS_PER_BYTE) +#else +#define BITOFF_CAL(size, off) (off * BITS_PER_BYTE) +#endif + +#define XCHG_GEN(type, sfx, cl) \ +static inline u32 __xchg_##type##sfx(volatile void *p, u32 val) \ +{ \ + unsigned int prev, prev_mask, tmp, bitoff, off; \ + \ + off = (unsigned long)p % sizeof(u32); \ + bitoff = BITOFF_CAL(sizeof(type), off); \ + p -= off; \ + val <<= bitoff; \ + prev_mask = (u32)(type)-1 << bitoff; \ + \ + __asm__ __volatile__( \ +"1: lwarx %0,0,%3\n" \ +" andc %1,%0,%5\n" \ +" or %1,%1,%4\n" \ +" stwcx. %1,0,%3\n" \ +" bne- 1b\n" \ + : "=&r" (prev), "=&r" (tmp), "+m" (*(u32*)p) \ + : "r" (p), "r" (val), "r" (prev_mask) \ + : "cc", cl); \ + \ + return prev >> bitoff; \ +} + +#define CMPXCHG_GEN(type, sfx, br, br2, cl) \ +static inline \ +u32 __cmpxchg_##type##sfx(volatile void *p, u32 old, u32 new) \ +{ \ + unsigned int prev, prev_mask, tmp, bitoff, off; \ + \ + off = (unsigned long)p % sizeof(u32); \ + bitoff = BITOFF_CAL(sizeof(type), off); \ + p -= off; \ + old <<= bitoff; \ + new <<= bitoff; \ + prev_mask = (u32)(type)-1 << bitoff; \ + \ + __asm__ __volatile__( \ + br \ +"1: lwarx %0,0,%3\n" \ +" and %1,%0,%6\n" \ +" cmpw 0,%1,%4\n" \ +" bne- 2f\n" \ +" andc %1,%0,%6\n" \ +" or %1,%1,%5\n" \ +" stwcx. %1,0,%3\n" \ +" bne- 1b\n" \ + br2 \ + "\n" \ +"2:" \ + : "=&r" (prev), "=&r" (tmp), "+m" (*(u32*)p) \ + : "r" (p), "r" (old), "r" (new), "r" (prev_mask) \ + : "cc", cl); \ + \ + return prev >> bitoff; \ +} + +/* + * Atomic exchange + * + * Changes the memory location '*p' to be val and returns + * the previous value stored there. + */ + +#ifndef CONFIG_PPC_HAS_LBARX_LHARX +XCHG_GEN(u8, _local, "memory"); +XCHG_GEN(u8, _relaxed, "cc"); +XCHG_GEN(u16, _local, "memory"); +XCHG_GEN(u16, _relaxed, "cc"); +#else +static __always_inline unsigned long +__xchg_u8_local(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lbarx %0,0,%2 # __xchg_u8_local\n" +" stbcx. %3,0,%2 \n" +" bne- 1b" + : "=&r" (prev), "+m" (*(volatile unsigned char *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__xchg_u8_relaxed(u8 *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lbarx %0,0,%2 # __xchg_u8_relaxed\n" +" stbcx. %3,0,%2\n" +" bne- 1b" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (val) + : "cc"); + + return prev; +} + +static __always_inline unsigned long +__xchg_u16_local(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lharx %0,0,%2 # __xchg_u16_local\n" +" sthcx. %3,0,%2\n" +" bne- 1b" + : "=&r" (prev), "+m" (*(volatile unsigned short *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__xchg_u16_relaxed(u16 *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lharx %0,0,%2 # __xchg_u16_relaxed\n" +" sthcx. %3,0,%2\n" +" bne- 1b" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (val) + : "cc"); + + return prev; +} +#endif + +static __always_inline unsigned long +__xchg_u32_local(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lwarx %0,0,%2 \n" +" stwcx. %3,0,%2 \n\ + bne- 1b" + : "=&r" (prev), "+m" (*(volatile unsigned int *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__xchg_u32_relaxed(u32 *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: lwarx %0,0,%2\n" +" stwcx. %3,0,%2\n" +" bne- 1b" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (val) + : "cc"); + + return prev; +} + +#ifdef CONFIG_PPC64 +static __always_inline unsigned long +__xchg_u64_local(volatile void *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: ldarx %0,0,%2 \n" +" stdcx. %3,0,%2 \n\ + bne- 1b" + : "=&r" (prev), "+m" (*(volatile unsigned long *)p) + : "r" (p), "r" (val) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__xchg_u64_relaxed(u64 *p, unsigned long val) +{ + unsigned long prev; + + __asm__ __volatile__( +"1: ldarx %0,0,%2\n" +" stdcx. %3,0,%2\n" +" bne- 1b" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (val) + : "cc"); + + return prev; +} +#endif + +static __always_inline unsigned long +__xchg_local(void *ptr, unsigned long x, unsigned int size) +{ + switch (size) { + case 1: + return __xchg_u8_local(ptr, x); + case 2: + return __xchg_u16_local(ptr, x); + case 4: + return __xchg_u32_local(ptr, x); +#ifdef CONFIG_PPC64 + case 8: + return __xchg_u64_local(ptr, x); +#endif + } + BUILD_BUG_ON_MSG(1, "Unsupported size for __xchg"); + return x; +} + +static __always_inline unsigned long +__xchg_relaxed(void *ptr, unsigned long x, unsigned int size) +{ + switch (size) { + case 1: + return __xchg_u8_relaxed(ptr, x); + case 2: + return __xchg_u16_relaxed(ptr, x); + case 4: + return __xchg_u32_relaxed(ptr, x); +#ifdef CONFIG_PPC64 + case 8: + return __xchg_u64_relaxed(ptr, x); +#endif + } + BUILD_BUG_ON_MSG(1, "Unsupported size for __xchg_local"); + return x; +} +#define arch_xchg_local(ptr,x) \ + ({ \ + __typeof__(*(ptr)) _x_ = (x); \ + (__typeof__(*(ptr))) __xchg_local((ptr), \ + (unsigned long)_x_, sizeof(*(ptr))); \ + }) + +#define arch_xchg_relaxed(ptr, x) \ +({ \ + __typeof__(*(ptr)) _x_ = (x); \ + (__typeof__(*(ptr))) __xchg_relaxed((ptr), \ + (unsigned long)_x_, sizeof(*(ptr))); \ +}) + +/* + * Compare and exchange - if *p == old, set it to new, + * and return the old value of *p. + */ +#ifndef CONFIG_PPC_HAS_LBARX_LHARX +CMPXCHG_GEN(u8, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory"); +CMPXCHG_GEN(u8, _local, , , "memory"); +CMPXCHG_GEN(u8, _acquire, , PPC_ACQUIRE_BARRIER, "memory"); +CMPXCHG_GEN(u8, _relaxed, , , "cc"); +CMPXCHG_GEN(u16, , PPC_ATOMIC_ENTRY_BARRIER, PPC_ATOMIC_EXIT_BARRIER, "memory"); +CMPXCHG_GEN(u16, _local, , , "memory"); +CMPXCHG_GEN(u16, _acquire, , PPC_ACQUIRE_BARRIER, "memory"); +CMPXCHG_GEN(u16, _relaxed, , , "cc"); +#else +static __always_inline unsigned long +__cmpxchg_u8(volatile unsigned char *p, unsigned long old, unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( + PPC_ATOMIC_ENTRY_BARRIER +"1: lbarx %0,0,%2 # __cmpxchg_u8\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" stbcx. %4,0,%2\n" +" bne- 1b" + PPC_ATOMIC_EXIT_BARRIER + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u8_local(volatile unsigned char *p, unsigned long old, + unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( +"1: lbarx %0,0,%2 # __cmpxchg_u8_local\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" stbcx. %4,0,%2\n" +" bne- 1b\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u8_relaxed(u8 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: lbarx %0,0,%2 # __cmpxchg_u8_relaxed\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" stbcx. %4,0,%2\n" +" bne- 1b\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u8_acquire(u8 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: lbarx %0,0,%2 # __cmpxchg_u8_acquire\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" stbcx. %4,0,%2\n" +" bne- 1b\n" + PPC_ACQUIRE_BARRIER +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u16(volatile unsigned short *p, unsigned long old, unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( + PPC_ATOMIC_ENTRY_BARRIER +"1: lharx %0,0,%2 # __cmpxchg_u16\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" sthcx. %4,0,%2\n" +" bne- 1b\n" + PPC_ATOMIC_EXIT_BARRIER +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u16_local(volatile unsigned short *p, unsigned long old, + unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( +"1: lharx %0,0,%2 # __cmpxchg_u16_local\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" sthcx. %4,0,%2\n" +" bne- 1b" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u16_relaxed(u16 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: lharx %0,0,%2 # __cmpxchg_u16_relaxed\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" sthcx. %4,0,%2\n" +" bne- 1b\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u16_acquire(u16 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: lharx %0,0,%2 # __cmpxchg_u16_acquire\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" sthcx. %4,0,%2\n" +" bne- 1b\n" + PPC_ACQUIRE_BARRIER +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} +#endif + +static __always_inline unsigned long +__cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( + PPC_ATOMIC_ENTRY_BARRIER +"1: lwarx %0,0,%2 # __cmpxchg_u32\n\ + cmpw 0,%0,%3\n\ + bne- 2f\n" +" stwcx. %4,0,%2\n\ + bne- 1b" + PPC_ATOMIC_EXIT_BARRIER + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u32_local(volatile unsigned int *p, unsigned long old, + unsigned long new) +{ + unsigned int prev; + + __asm__ __volatile__ ( +"1: lwarx %0,0,%2 # __cmpxchg_u32\n\ + cmpw 0,%0,%3\n\ + bne- 2f\n" +" stwcx. %4,0,%2\n\ + bne- 1b" + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u32_relaxed(u32 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: lwarx %0,0,%2 # __cmpxchg_u32_relaxed\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" stwcx. %4,0,%2\n" +" bne- 1b\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc"); + + return prev; +} + +/* + * cmpxchg family don't have order guarantee if cmp part fails, therefore we + * can avoid superfluous barriers if we use assembly code to implement + * cmpxchg() and cmpxchg_acquire(), however we don't do the similar for + * cmpxchg_release() because that will result in putting a barrier in the + * middle of a ll/sc loop, which is probably a bad idea. For example, this + * might cause the conditional store more likely to fail. + */ +static __always_inline unsigned long +__cmpxchg_u32_acquire(u32 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: lwarx %0,0,%2 # __cmpxchg_u32_acquire\n" +" cmpw 0,%0,%3\n" +" bne- 2f\n" +" stwcx. %4,0,%2\n" +" bne- 1b\n" + PPC_ACQUIRE_BARRIER + "\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +#ifdef CONFIG_PPC64 +static __always_inline unsigned long +__cmpxchg_u64(volatile unsigned long *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( + PPC_ATOMIC_ENTRY_BARRIER +"1: ldarx %0,0,%2 # __cmpxchg_u64\n\ + cmpd 0,%0,%3\n\ + bne- 2f\n\ + stdcx. %4,0,%2\n\ + bne- 1b" + PPC_ATOMIC_EXIT_BARRIER + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u64_local(volatile unsigned long *p, unsigned long old, + unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: ldarx %0,0,%2 # __cmpxchg_u64\n\ + cmpd 0,%0,%3\n\ + bne- 2f\n\ + stdcx. %4,0,%2\n\ + bne- 1b" + "\n\ +2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u64_relaxed(u64 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: ldarx %0,0,%2 # __cmpxchg_u64_relaxed\n" +" cmpd 0,%0,%3\n" +" bne- 2f\n" +" stdcx. %4,0,%2\n" +" bne- 1b\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc"); + + return prev; +} + +static __always_inline unsigned long +__cmpxchg_u64_acquire(u64 *p, unsigned long old, unsigned long new) +{ + unsigned long prev; + + __asm__ __volatile__ ( +"1: ldarx %0,0,%2 # __cmpxchg_u64_acquire\n" +" cmpd 0,%0,%3\n" +" bne- 2f\n" +" stdcx. %4,0,%2\n" +" bne- 1b\n" + PPC_ACQUIRE_BARRIER + "\n" +"2:" + : "=&r" (prev), "+m" (*p) + : "r" (p), "r" (old), "r" (new) + : "cc", "memory"); + + return prev; +} +#endif + +static __always_inline unsigned long +__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, + unsigned int size) +{ + switch (size) { + case 1: + return __cmpxchg_u8(ptr, old, new); + case 2: + return __cmpxchg_u16(ptr, old, new); + case 4: + return __cmpxchg_u32(ptr, old, new); +#ifdef CONFIG_PPC64 + case 8: + return __cmpxchg_u64(ptr, old, new); +#endif + } + BUILD_BUG_ON_MSG(1, "Unsupported size for __cmpxchg"); + return old; +} + +static __always_inline unsigned long +__cmpxchg_local(void *ptr, unsigned long old, unsigned long new, + unsigned int size) +{ + switch (size) { + case 1: + return __cmpxchg_u8_local(ptr, old, new); + case 2: + return __cmpxchg_u16_local(ptr, old, new); + case 4: + return __cmpxchg_u32_local(ptr, old, new); +#ifdef CONFIG_PPC64 + case 8: + return __cmpxchg_u64_local(ptr, old, new); +#endif + } + BUILD_BUG_ON_MSG(1, "Unsupported size for __cmpxchg_local"); + return old; +} + +static __always_inline unsigned long +__cmpxchg_relaxed(void *ptr, unsigned long old, unsigned long new, + unsigned int size) +{ + switch (size) { + case 1: + return __cmpxchg_u8_relaxed(ptr, old, new); + case 2: + return __cmpxchg_u16_relaxed(ptr, old, new); + case 4: + return __cmpxchg_u32_relaxed(ptr, old, new); +#ifdef CONFIG_PPC64 + case 8: + return __cmpxchg_u64_relaxed(ptr, old, new); +#endif + } + BUILD_BUG_ON_MSG(1, "Unsupported size for __cmpxchg_relaxed"); + return old; +} + +static __always_inline unsigned long +__cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new, + unsigned int size) +{ + switch (size) { + case 1: + return __cmpxchg_u8_acquire(ptr, old, new); + case 2: + return __cmpxchg_u16_acquire(ptr, old, new); + case 4: + return __cmpxchg_u32_acquire(ptr, old, new); +#ifdef CONFIG_PPC64 + case 8: + return __cmpxchg_u64_acquire(ptr, old, new); +#endif + } + BUILD_BUG_ON_MSG(1, "Unsupported size for __cmpxchg_acquire"); + return old; +} +#define arch_cmpxchg(ptr, o, n) \ + ({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ + (unsigned long)_n_, sizeof(*(ptr))); \ + }) + + +#define arch_cmpxchg_local(ptr, o, n) \ + ({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \ + (unsigned long)_n_, sizeof(*(ptr))); \ + }) + +#define arch_cmpxchg_relaxed(ptr, o, n) \ +({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \ + (unsigned long)_o_, (unsigned long)_n_, \ + sizeof(*(ptr))); \ +}) + +#define arch_cmpxchg_acquire(ptr, o, n) \ +({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg_acquire((ptr), \ + (unsigned long)_o_, (unsigned long)_n_, \ + sizeof(*(ptr))); \ +}) +#ifdef CONFIG_PPC64 +#define arch_cmpxchg64(ptr, o, n) \ + ({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + arch_cmpxchg((ptr), (o), (n)); \ + }) +#define arch_cmpxchg64_local(ptr, o, n) \ + ({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + arch_cmpxchg_local((ptr), (o), (n)); \ + }) +#define arch_cmpxchg64_relaxed(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + arch_cmpxchg_relaxed((ptr), (o), (n)); \ +}) +#define arch_cmpxchg64_acquire(ptr, o, n) \ +({ \ + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \ + arch_cmpxchg_acquire((ptr), (o), (n)); \ +}) +#else +#include +#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n)) +#endif + +#endif /* __KERNEL__ */ +#endif /* _ASM_POWERPC_CMPXCHG_H_ */ -- cgit v1.2.3