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2022-01-07parisc: Rewrite light-weight syscall and futex codeJohn David Anglin1-22/+37
The parisc architecture lacks general hardware support for compare and swap. Particularly for userspace, it is difficult to implement software atomic support. Page faults in critical regions can cause processes to sleep and block the forward progress of other processes. Thus, it is essential that page faults be disabled in critical regions. For performance reasons, we also need to disable external interrupts in critical regions. In order to do this, we need a mechanism to trigger COW breaks outside the critical region. Fortunately, parisc has the "stbys,e" instruction. When the leftmost byte of a word is addressed, this instruction triggers all the exceptions of a normal store but it does not write to memory. Thus, we can use it to trigger COW breaks outside the critical region without modifying the data that is to be updated atomically. COW breaks occur randomly. So even if we have priviously executed a "stbys,e" instruction, we still need to disable pagefaults around the critical region. If a fault occurs in the critical region, we return -EAGAIN. I had to add a wrapper around _arch_futex_atomic_op_inuser() as I found in testing that returning -EAGAIN caused problems for some processes even though it is listed as a possible return value. The patch implements the above. The code no longer attempts to sleep with interrupts disabled and I haven't seen any stalls with the change. I have attempted to merge common code and streamline the fast path. In the futex code, we only compute the spinlock address once. I eliminated some debug code in the original CAS routine that just made the flow more complicated. I don't clip the arguments when called from wide mode. As a result, the LWS routines should work when called from 64-bit processes. I defined TASK_PAGEFAULT_DISABLED offset for use in the lws_pagefault_disable and lws_pagefault_enable macros. Since we now disable interrupts on the gateway page where necessary, it might be possible to allow processes to be scheduled when they are on the gateway page. Change has been tested on c8000 and rp3440. It improves glibc build and test time by about 10%. In v2, I removed the lws_atomic_xchg and and lws_atomic_store calls. I also removed the bug fixes that were not directly related to this patch. In v3, I removed the code to force interruptions from arch_futex_atomic_op_inuser(). It is always called with page faults disabled, so this code had no effect. In v4, I fixed a typo in depi_safe line. In v5, I moved the code to disable/enable page faults inside the spinlocks. Signed-off-by: John David Anglin <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2022-01-07parisc: Switch user access functions to signal errors in r29 instead of r8Helge Deller1-4/+8
Use register r29 instead of register r8 to signal faults when accessing user memory. In case of faults, the fixup routine will store -EFAULT in this register. This change saves up to 752 bytes on a 32bit kernel, partly because the compiler doesn't need to save and restore the old r8 value on the stack. bloat-o-meter results for usage with r29 register: add/remove: 0/0 grow/shrink: 23/86 up/down: 228/-980 (-752) bloat-o-meter results for usage with r28 register: add/remove: 0/0 grow/shrink: 28/83 up/down: 296/-956 (-660) Signed-off-by: Helge Deller <[email protected]>
2022-01-07parisc: Fix lpa and lpa_user definesJohn David Anglin1-20/+24
While working on the rewrite to the light-weight syscall and futex code, I experimented with using a hash index based on the user physical address of atomic variable. This exposed two problems with the lpa and lpa_user defines. Because of the copy instruction, the pa argument needs to be an early clobber argument. This prevents gcc from allocating the va and pa arguments to the same register. Secondly, the lpa instruction can cause a page fault so we need to catch exceptions. Signed-off-by: John David Anglin <[email protected]> Fixes: 116d753308cf ("parisc: Use lpa instruction to load physical addresses in driver code") Signed-off-by: Helge Deller <[email protected]> Cc: [email protected] # v5.2+
2022-01-07parisc: Define depi_safe macroJohn David Anglin1-0/+10
The depi instruction is similar to the extru instruction on 64-bit machines. It leaves the most-significant 32 bits of the target register in an undefined state. On 64-bit machines, the macro uses depdi to perform safe deposits in the least-significant 32 bits. Signed-off-by: John David Anglin <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-12-21parisc: Fix mask used to select futex spinlockJohn David Anglin1-2/+2
The address bits used to select the futex spinlock need to match those used in the LWS code in syscall.S. The mask 0x3f8 only selects 7 bits. It should select 8 bits. This change fixes the glibc nptl/tst-cond24 and nptl/tst-cond25 tests. Signed-off-by: John David Anglin <[email protected]> Fixes: 53a42b6324b8 ("parisc: Switch to more fine grained lws locks") Cc: [email protected] # 5.10+ Signed-off-by: Helge Deller <[email protected]>
2021-11-25Merge tag 'folio-5.16b' of git://git.infradead.org/users/willy/pagecacheLinus Torvalds1-1/+0
Pull folio fixes from Matthew Wilcox: "In the course of preparing the folio changes for iomap for next merge window, we discovered some problems that would be nice to address now: - Renaming multi-page folios to large folios. mapping_multi_page_folio_support() is just a little too long, so we settled on mapping_large_folio_support(). That meant renaming, eg folio_test_multi() to folio_test_large(). Rename AS_THP_SUPPORT to match - I hadn't included folio wrappers for zero_user_segments(), etc. Also, multi-page^W^W large folio support is now independent of CONFIG_TRANSPARENT_HUGEPAGE, so machines with HIGHMEM always need to fall back to the out-of-line zero_user_segments(). Remove FS_THP_SUPPORT to match - The build bots finally got round to telling me that I missed a couple of architectures when adding flush_dcache_folio(). Christoph suggested that we just add linux/cacheflush.h and not rely on asm-generic/cacheflush.h" * tag 'folio-5.16b' of git://git.infradead.org/users/willy/pagecache: mm: Add functions to zero portions of a folio fs: Rename AS_THP_SUPPORT and mapping_thp_support fs: Remove FS_THP_SUPPORT mm: Remove folio_test_single mm: Rename folio_test_multi to folio_test_large Add linux/cacheflush.h
2021-11-22parisc: Provide an extru_safe() macro to extract unsigned bitsHelge Deller1-0/+11
The extru instruction leaves the most significant 32 bits of the target register in an undefined state on PA 2.0 systems. Provide a macro to safely use extru on 32- and 64-bit machines. Suggested-by: John David Anglin <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-11-18Revert "parisc: Reduce sigreturn trampoline to 3 instructions"Helge Deller1-1/+1
This reverts commit e4f2006f1287e7ea17660490569cff323772dac4. This patch shows problems with signal handling. Revert it for now. Signed-off-by: Helge Deller <[email protected]> Cc: <[email protected]> # v5.15
2021-11-18parisc: Wrap assembler related defines inside __ASSEMBLY__Helge Deller1-20/+24
Building allmodconfig shows errors in the gpu/drm/msm snapdragon drivers, because a COND() define is used there which conflicts with the COND() for PA-RISC assembly. Although the snapdragon driver isn't relevant for parisc, it is nevertheless compiled when CONFIG_COMPILE_TEST is defined. Move the COND() define and other PA-RISC mnemonics inside the #ifdef __ASSEMBLY__ part to avoid this conflict. Signed-off-by: Helge Deller <[email protected]> Reported-by: kernel test robot <[email protected]>
2021-11-18parisc: Include stringify.h to avoid build error in crypto/api.cHelge Deller1-0/+1
Include stringify.h to avoid this build error: arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify' arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label] Signed-off-by: Helge Deller <[email protected]> Reported-by: kernel test robot <[email protected]>
2021-11-17Add linux/cacheflush.hMatthew Wilcox (Oracle)1-1/+0
Many architectures do not include asm-generic/cacheflush.h, so turn the includes on their head and add linux/cacheflush.h which includes asm/cacheflush.h. Move the flush_dcache_folio() declaration from asm-generic/cacheflush.h to linux/cacheflush.h and change linux/highmem.h to include linux/cacheflush.h instead of asm/cacheflush.h so that all necessary places will see flush_dcache_folio(). More functions should have their default implementations moved in the future, but those are for follow-on patches. This fixes csky, sparc and sparc64 which were missed in the commit which added flush_dcache_folio(). Fixes: 08b0b0059bf1 ("mm: Add flush_dcache_folio()") Suggested-by: Christoph Hellwig <[email protected]> Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]>
2021-11-13parisc: Flush kernel data mapping in set_pte_at() when installing pte for ↵John David Anglin1-2/+8
user page For years, there have been random segmentation faults in userspace on SMP PA-RISC machines. It occurred to me that this might be a problem in set_pte_at(). MIPS and some other architectures do cache flushes when installing PTEs with the present bit set. Here I have adapted the code in update_mmu_cache() to flush the kernel mapping when the kernel flush is deferred, or when the kernel mapping may alias with the user mapping. This simplifies calls to update_mmu_cache(). I also changed the barrier in set_pte() from a compiler barrier to a full memory barrier. I know this change is not sufficient to fix the problem. It might not be needed. I have had a few days of operation with 5.14.16 to 5.15.1 and haven't seen any random segmentation faults on rp3440 or c8000 so far. Signed-off-by: John David Anglin <[email protected]> Signed-off-by: Helge Deller <[email protected]> Cc: [email protected] # 5.12+
2021-11-04parisc: move CPU field back into thread_infoArd Biesheuvel2-17/+5
In commit 2214c0e77259 ("parisc: Move thread_info into task struct") PA-RISC gained support for THREAD_INFO_IN_TASK while changes were already underway to keep the CPU field in thread_info rather than move it into task_struct when THREAD_INFO_IN_TASK is enabled. The result is a broken build for all PA-RISC configs that enable SMP. So let's partially revert that commit, and get rid of the ugly hack to get at the offset of task_struct::cpu without having to include linux/sched.h, and put the CPU field back where it was before. Reported-by: Guenter Roeck <[email protected]> Fixes: bcf9033e5449 ("sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y") Signed-off-by: Ard Biesheuvel <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-11-04parisc: Don't disable interrupts in cmpxchg and futex operationsDave Anglin1-13/+11
I no longer think interrupts can be disabled in the futex and cmpxchg operations because of COW breaks. This not ideal but I suspect it's the best we can do. For the cmpxchg operations in syscall.S, we rely on the code to not schedule off the gateway page. For the futex, I added code to disable preemption. So far, I haven't seen the warnings with the attached change but the change is only lightly tested. Signed-off-by: Dave Anglin <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-11-02Merge tag 'net-next-for-5.16' of ↵Linus Torvalds1-0/+2
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Remove socket skb caches - Add a SO_RESERVE_MEM socket op to forward allocate buffer space and avoid memory accounting overhead on each message sent - Introduce managed neighbor entries - added by control plane and resolved by the kernel for use in acceleration paths (BPF / XDP right now, HW offload users will benefit as well) - Make neighbor eviction on link down controllable by userspace to work around WiFi networks with bad roaming implementations - vrf: Rework interaction with netfilter/conntrack - fq_codel: implement L4S style ce_threshold_ect1 marking - sch: Eliminate unnecessary RCU waits in mini_qdisc_pair_swap() BPF: - Add support for new btf kind BTF_KIND_TAG, arbitrary type tagging as implemented in LLVM14 - Introduce bpf_get_branch_snapshot() to capture Last Branch Records - Implement variadic trace_printk helper - Add a new Bloomfilter map type - Track <8-byte scalar spill and refill - Access hw timestamp through BPF's __sk_buff - Disallow unprivileged BPF by default - Document BPF licensing Netfilter: - Introduce egress hook for looking at raw outgoing packets - Allow matching on and modifying inner headers / payload data - Add NFT_META_IFTYPE to match on the interface type either from ingress or egress Protocols: - Multi-Path TCP: - increase default max additional subflows to 2 - rework forward memory allocation - add getsockopts: MPTCP_INFO, MPTCP_TCPINFO, MPTCP_SUBFLOW_ADDRS - MCTP flow support allowing lower layer drivers to configure msg muxing as needed - Automatic Multicast Tunneling (AMT) driver based on RFC7450 - HSR support the redbox supervision frames (IEC-62439-3:2018) - Support for the ip6ip6 encapsulation of IOAM - Netlink interface for CAN-FD's Transmitter Delay Compensation - Support SMC-Rv2 eliminating the current same-subnet restriction, by exploiting the UDP encapsulation feature of RoCE adapters - TLS: add SM4 GCM/CCM crypto support - Bluetooth: initial support for link quality and audio/codec offload Driver APIs: - Add a batched interface for RX buffer allocation in AF_XDP buffer pool - ethtool: Add ability to control transceiver modules' power mode - phy: Introduce supported interfaces bitmap to express MAC capabilities and simplify PHY code - Drop rtnl_lock from DSA .port_fdb_{add,del} callbacks New drivers: - WiFi driver for Realtek 8852AE 802.11ax devices (rtw89) - Ethernet driver for ASIX AX88796C SPI device (x88796c) Drivers: - Broadcom PHYs - support 72165, 7712 16nm PHYs - support IDDQ-SR for additional power savings - PHY support for QCA8081, QCA9561 PHYs - NXP DPAA2: support for IRQ coalescing - NXP Ethernet (enetc): support for software TCP segmentation - Renesas Ethernet (ravb) - support DMAC and EMAC blocks of Gigabit-capable IP found on RZ/G2L SoC - Intel 100G Ethernet - support for eswitch offload of TC/OvS flow API, including offload of GRE, VxLAN, Geneve tunneling - support application device queues - ability to assign Rx and Tx queues to application threads - PTP and PPS (pulse-per-second) extensions - Broadcom Ethernet (bnxt) - devlink health reporting and device reload extensions - Mellanox Ethernet (mlx5) - offload macvlan interfaces - support HW offload of TC rules involving OVS internal ports - support HW-GRO and header/data split - support application device queues - Marvell OcteonTx2: - add XDP support for PF - add PTP support for VF - Qualcomm Ethernet switch (qca8k): support for QCA8328 - Realtek Ethernet DSA switch (rtl8366rb) - support bridge offload - support STP, fast aging, disabling address learning - support for Realtek RTL8365MB-VC, a 4+1 port 10M/100M/1GE switch - Mellanox Ethernet/IB switch (mlxsw) - multi-level qdisc hierarchy offload (e.g. RED, prio and shaping) - offload root TBF qdisc as port shaper - support multiple routing interface MAC address prefixes - support for IP-in-IP with IPv6 underlay - MediaTek WiFi (mt76) - mt7921 - ASPM, 6GHz, SDIO and testmode support - mt7915 - LED and TWT support - Qualcomm WiFi (ath11k) - include channel rx and tx time in survey dump statistics - support for 80P80 and 160 MHz bandwidths - support channel 2 in 6 GHz band - spectral scan support for QCN9074 - support for rx decapsulation offload (data frames in 802.3 format) - Qualcomm phone SoC WiFi (wcn36xx) - enable Idle Mode Power Save (IMPS) to reduce power consumption during idle - Bluetooth driver support for MediaTek MT7922 and MT7921 - Enable support for AOSP Bluetooth extension in Qualcomm WCN399x and Realtek 8822C/8852A - Microsoft vNIC driver (mana) - support hibernation and kexec - Google vNIC driver (gve) - support for jumbo frames - implement Rx page reuse Refactor: - Make all writes to netdev->dev_addr go thru helpers, so that we can add this address to the address rbtree and handle the updates - Various TCP cleanups and optimizations including improvements to CPU cache use - Simplify the gnet_stats, Qdisc stats' handling and remove qdisc->running sequence counter - Driver changes and API updates to address devlink locking deficiencies" * tag 'net-next-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2122 commits) Revert "net: avoid double accounting for pure zerocopy skbs" selftests: net: add arp_ndisc_evict_nocarrier net: ndisc: introduce ndisc_evict_nocarrier sysctl parameter net: arp: introduce arp_evict_nocarrier sysctl parameter libbpf: Deprecate AF_XDP support kbuild: Unify options for BTF generation for vmlinux and modules selftests/bpf: Add a testcase for 64-bit bounds propagation issue. bpf: Fix propagation of signed bounds from 64-bit min/max into 32-bit. bpf: Fix propagation of bounds from 64-bit min/max into 32-bit and var_off. net: vmxnet3: remove multiple false checks in vmxnet3_ethtool.c net: avoid double accounting for pure zerocopy skbs tcp: rename sk_wmem_free_skb netdevsim: fix uninit value in nsim_drv_configure_vfs() selftests/bpf: Fix also no-alu32 strobemeta selftest bpf: Add missing map_delete_elem method to bloom filter map selftests/bpf: Add bloom map success test for userspace calls bpf: Add alignment padding for "map_extra" + consolidate holes bpf: Bloom filter map naming fixups selftests/bpf: Add test cases for struct_ops prog bpf: Add dummy BPF STRUCT_OPS for test purpose ...
2021-11-01Merge tag 'for-5.16/parisc-1' of ↵Linus Torvalds16-47/+150
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc updates from Helge Deller: "Lots of new features and fixes: - Added TOC (table of content) support, which is a debugging feature which is either initiated by pressing the TOC button or via command in the BMC. If pressed the Linux built-in KDB/KGDB will be called (Sven Schnelle) - Fix CONFIG_PREEMPT (Sven) - Fix unwinder on 64-bit kernels (Sven) - Various kgdb fixes (Sven) - Added KFENCE support (me) - Switch to ARCH_STACKWALK implementation (me) - Fix ptrace check on syscall return (me) - Fix kernel crash with fixmaps on PA1.x machines (me) - Move thread_info into task struct, aka CONFIG_THREAD_INFO_IN_TASK (me) - Updated defconfigs - Smaller cleanups, including Makefile cleanups (Masahiro Yamada), use kthread_run() macro (Cai Huoqing), use swap() macro (Yihao Han)" * tag 'for-5.16/parisc-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: (36 commits) parisc: Fix set_fixmap() on PA1.x CPUs parisc: Use swap() to swap values in setup_bootmem() parisc: Update defconfigs parisc: decompressor: clean up Makefile parisc: decompressor: remove repeated depenency of misc.o parisc: Remove unused constants from asm-offsets.c parisc/ftrace: use static key to enable/disable function graph tracer parisc/ftrace: set function trace function parisc: Make use of the helper macro kthread_run() parisc: mark xchg functions notrace parisc: enhance warning regarding usage of O_NONBLOCK parisc: Drop ifdef __KERNEL__ from non-uapi kernel headers parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.h parisc: Use PRIV_USER in syscall.S parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling parisc: Move thread_info into task struct parisc: add support for TOC (transfer of control) parisc/firmware: add functions to retrieve TOC data parisc: add PIM TOC data structures parisc: move virt_map macro to assembly.h ...
2021-11-01Merge tag 'sched-core-2021-11-01' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull scheduler updates from Thomas Gleixner: - Revert the printk format based wchan() symbol resolution as it can leak the raw value in case that the symbol is not resolvable. - Make wchan() more robust and work with all kind of unwinders by enforcing that the task stays blocked while unwinding is in progress. - Prevent sched_fork() from accessing an invalid sched_task_group - Improve asymmetric packing logic - Extend scheduler statistics to RT and DL scheduling classes and add statistics for bandwith burst to the SCHED_FAIR class. - Properly account SCHED_IDLE entities - Prevent a potential deadlock when initial priority is assigned to a newly created kthread. A recent change to plug a race between cpuset and __sched_setscheduler() introduced a new lock dependency which is now triggered. Break the lock dependency chain by moving the priority assignment to the thread function. - Fix the idle time reporting in /proc/uptime for NOHZ enabled systems. - Improve idle balancing in general and especially for NOHZ enabled systems. - Provide proper interfaces for live patching so it does not have to fiddle with scheduler internals. - Add cluster aware scheduling support. - A small set of tweaks for RT (irqwork, wait_task_inactive(), various scheduler options and delaying mmdrop) - The usual small tweaks and improvements all over the place * tag 'sched-core-2021-11-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (69 commits) sched/fair: Cleanup newidle_balance sched/fair: Remove sysctl_sched_migration_cost condition sched/fair: Wait before decaying max_newidle_lb_cost sched/fair: Skip update_blocked_averages if we are defering load balance sched/fair: Account update_blocked_averages in newidle_balance cost x86: Fix __get_wchan() for !STACKTRACE sched,x86: Fix L2 cache mask sched/core: Remove rq_relock() sched: Improve wake_up_all_idle_cpus() take #2 irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ on PREEMPT_RT irq_work: Handle some irq_work in a per-CPU thread on PREEMPT_RT irq_work: Allow irq_work_sync() to sleep if irq_work() no IRQ support. sched/rt: Annotate the RT balancing logic irqwork as IRQ_WORK_HARD_IRQ sched: Add cluster scheduler level for x86 sched: Add cluster scheduler level in core and related Kconfig for ARM64 topology: Represent clusters of CPUs within a die sched: Disable -Wunused-but-set-variable sched: Add wrapper for get_wchan() to keep task blocked x86: Fix get_wchan() to support the ORC unwinder proc: Use task_is_running() for wchan in /proc/$pid/stat ...
2021-11-01Merge tag 'locking-core-2021-10-31' of ↵Linus Torvalds1-15/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull locking updates from Thomas Gleixner: - Move futex code into kernel/futex/ and split up the kitchen sink into seperate files to make integration of sys_futex_waitv() simpler. - Add a new sys_futex_waitv() syscall which allows to wait on multiple futexes. The main use case is emulating Windows' WaitForMultipleObjects which allows Wine to improve the performance of Windows Games. Also native Linux games can benefit from this interface as this is a common wait pattern for this kind of applications. - Add context to ww_mutex_trylock() to provide a path for i915 to rework their eviction code step by step without making lockdep upset until the final steps of rework are completed. It's also useful for regulator and TTM to avoid dropping locks in the non contended path. - Lockdep and might_sleep() cleanups and improvements - A few improvements for the RT substitutions. - The usual small improvements and cleanups. * tag 'locking-core-2021-10-31' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits) locking: Remove spin_lock_flags() etc locking/rwsem: Fix comments about reader optimistic lock stealing conditions locking: Remove rcu_read_{,un}lock() for preempt_{dis,en}able() locking/rwsem: Disable preemption for spinning region docs: futex: Fix kernel-doc references futex: Fix PREEMPT_RT build futex2: Documentation: Document sys_futex_waitv() uAPI selftests: futex: Test sys_futex_waitv() wouldblock selftests: futex: Test sys_futex_waitv() timeout selftests: futex: Add sys_futex_waitv() test futex,arm: Wire up sys_futex_waitv() futex,x86: Wire up sys_futex_waitv() futex: Implement sys_futex_waitv() futex: Simplify double_lock_hb() futex: Split out wait/wake futex: Split out requeue futex: Rename mark_wake_futex() futex: Rename: match_futex() futex: Rename: hb_waiter_{inc,dec,pending}() futex: Split out PI futex ...
2021-11-01parisc: enhance warning regarding usage of O_NONBLOCKHelge Deller1-0/+1
Instead of showing only the very first application which needs recompile, show all of them, but print them only once. Includes typo fix noticed by Colin Ian King. Signed-off-by: Helge Deller <[email protected]> Signed-off-by: Colin Ian King <[email protected]>
2021-11-01parisc: Drop ifdef __KERNEL__ from non-uapi kernel headersHelge Deller8-31/+0
Signed-off-by: Helge Deller <[email protected]>
2021-11-01parisc: Use PRIV_USER and PRIV_KERNEL in ptrace.hHelge Deller1-3/+3
Signed-off-by: Helge Deller <[email protected]>
2021-11-01parisc: Move thread_info into task structHelge Deller4-11/+36
This implements the CONFIG_THREAD_INFO_IN_TASK option. With this change: - before thread_info was part of the stack and located at the beginning of the stack - now the thread_info struct is moved and located inside the task_struct structure - the stack is allocated and handled like the major other platforms - drop the cpu field of thread_info and use instead the one in task_struct Signed-off-by: Helge Deller <[email protected]> Signed-off-by: Sven Schnelle <[email protected]>
2021-11-01parisc: add support for TOC (transfer of control)Sven Schnelle2-2/+8
Almost all PA-RISC machines have either a button that is labeled with 'TOC' or a BMC function to trigger a TOC. TOC is a non-maskable interrupt that is sent to the processor. This can be used for diagnostic purposes like obtaining a stack trace/register dump or to enter KDB/KGDB. As an example, on my c8000, TOC can be used with: CONFIG_KGDB=y CONFIG_KGDB_KDB=y and the 'kgdboc=ttyS0,115200' appended to the command line. Press ^[( on serial console, which will enter the BMC command line, and enter 'TOC s': root@(none):/# ( cli>TOC s Sending TOC/INIT. <Cpu3> 2800035d03e00000 0000000040c21ac8 CC_ERR_CHECK_TOC <Cpu0> 2800035d00e00000 0000000040c21ad0 CC_ERR_CHECK_TOC <Cpu2> 2800035d02e00000 0000000040c21ac8 CC_ERR_CHECK_TOC <Cpu1> 2800035d01e00000 0000000040c21ad0 CC_ERR_CHECK_TOC <Cpu3> 37000f7303e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu0> 37000f7300e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu2> 37000f7302e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu1> 37000f7301e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu3> 4300100803e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu0> 4300100800e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu2> 4300100802e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu1> 4300100801e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC Entering kdb (current=0x00000000411cef80, pid 0) on processor 0 due to NonMaskable Interrupt @ 0x40c21ad0 [0]kdb> Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-11-01parisc/firmware: add functions to retrieve TOC dataSven Schnelle1-0/+2
Add functions to retrieve TOC data from firmware both for 1.1 and 2.0 PDC. Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-11-01parisc: add PIM TOC data structuresSven Schnelle1-0/+22
These data structures describe the TOC data we get from firmware when issuing a PDC_PIM_TOC request. Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-11-01parisc: move virt_map macro to assembly.hSven Schnelle1-0/+25
This macro will also be used by the TOC code, so move it into asm/assembly.h to avoid duplication. Signed-off-by: Sven Schnelle <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-10-30parisc: Allocate task struct with stack frame alignmentHelge Deller1-1/+2
We will put the stack directly behind the task struct, so make sure that we allocate it with an alignment of 64 bytes. Signed-off-by: Helge Deller <[email protected]>
2021-10-30parisc: Define FRAME_ALIGN and PRIV_USER/PRIV_KERNEL in assembly.hHelge Deller1-0/+7
Signed-off-by: Helge Deller <[email protected]>
2021-10-30parisc: Add KFENCE supportHelge Deller1-0/+44
Signed-off-by: Helge Deller <[email protected]>
2021-10-30parisc: make parisc_acctyp() available outside of faults.cHelge Deller1-0/+1
When adding kfence support, we need to tell kfence_handle_page_fault() if the interrupted assembler statement is a read or write operation. Signed-off-by: Helge Deller <[email protected]>
2021-10-30locking: Remove spin_lock_flags() etcArnd Bergmann1-15/+0
parisc, ia64 and powerpc32 are the only remaining architectures that provide custom arch_{spin,read,write}_lock_flags() functions, which are meant to re-enable interrupts while waiting for a spinlock. However, none of these can actually run into this codepath, because it is only called on architectures without CONFIG_GENERIC_LOCKBREAK, or when CONFIG_DEBUG_LOCK_ALLOC is set without CONFIG_LOCKDEP, and none of those combinations are possible on the three architectures. Going back in the git history, it appears that arch/mn10300 may have been able to run into this code path, but there is a good chance that it never worked. On the architectures that still exist, it was already impossible to hit back in 2008 after the introduction of CONFIG_GENERIC_LOCKBREAK, and possibly earlier. As this is all dead code, just remove it and the helper functions built around it. For arch/ia64, the inline asm could be cleaned up, but it seems safer to leave it untouched. Signed-off-by: Arnd Bergmann <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Helge Deller <[email protected]> # parisc Link: https://lore.kernel.org/r/[email protected]
2021-10-18mm: Add flush_dcache_folio()Matthew Wilcox (Oracle)1-1/+2
This is a default implementation which calls flush_dcache_page() on each page in the folio. If architectures can do better, they should implement their own version of it. Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> Acked-by: Vlastimil Babka <[email protected]>
2021-10-15sched: Add wrapper for get_wchan() to keep task blockedKees Cook1-1/+1
Having a stable wchan means the process must be blocked and for it to stay that way while performing stack unwinding. Suggested-by: Peter Zijlstra <[email protected]> Signed-off-by: Kees Cook <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Acked-by: Russell King (Oracle) <[email protected]> [arm] Tested-by: Mark Rutland <[email protected]> [arm64] Link: https://lkml.kernel.org/r/[email protected]
2021-10-01fix up for "net: add new socket option SO_RESERVE_MEM"Stephen Rothwell1-0/+2
Some architectures do not include uapi/asm/socket.h Fixes: 2bb2f5fb21b0 ("net: add new socket option SO_RESERVE_MEM") Signed-off-by: Stephen Rothwell <[email protected]> Signed-off-by: David S. Miller <[email protected]>
2021-09-16parisc: Use absolute_pointer() to define PAGE0Helge Deller1-1/+1
Use absolute_pointer() wrapper for PAGE0 to avoid this compiler warning: arch/parisc/kernel/setup.c: In function 'start_parisc': error: '__builtin_memcmp_eq' specified bound 8 exceeds source size 0 Signed-off-by: Helge Deller <[email protected]> Co-Developed-by: Guenter Roeck <[email protected]> Suggested-by: Linus Torvalds <[email protected]>
2021-09-09parisc: Implement __get/put_kernel_nofault()Helge Deller3-67/+61
Remove CONFIG_SET_FS from parisc, so we need to add __get_kernel_nofault() and __put_kernel_nofault(), define HAVE_GET_KERNEL_NOFAULT and remove set_fs(), get_fs(), load_sr2(), thread_info->addr_limit, KERNEL_DS and USER_DS. The nice side-effect of this patch is that we now can directly access userspace via sr3 without the need to use a temporary sr2 which is either copied from sr3 or set to zero (for kernel space). Signed-off-by: Helge Deller <[email protected]> Suggested-by: Arnd Bergmann <[email protected]>
2021-09-09parisc: Reduce sigreturn trampoline to 3 instructionsHelge Deller1-1/+1
We can move the INSN_LDI_R20 instruction into the branch delay slot. Signed-off-by: Helge Deller <[email protected]>
2021-09-09parisc: Drop strnlen_user() in favour of generic versionHelge Deller1-2/+1
As suggested by Arnd Bergmann, drop the parisc version of strnlen_user() and switch to the generic version. Suggested-by: Arnd Bergmann <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-09-08arch: remove compat_alloc_user_spaceArnd Bergmann2-8/+0
All users of compat_alloc_user_space() and copy_in_user() have been removed from the kernel, only a few functions in sparc remain that can be changed to calling arch_copy_in_user() instead. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Arnd Bergmann <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Cc: Al Viro <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Eric Biederman <[email protected]> Cc: Feng Tang <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Helge Deller <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2021-09-03Merge tag 'for-5.15/parisc-2' of ↵Linus Torvalds1-68/+0
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc architecture fixes from Helge Deller: "Fix an unaligned-access crash in the bootloader and drop asm/swab.h" * tag 'for-5.15/parisc-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix unaligned-access crash in bootloader parisc: Drop __arch_swab16(), arch_swab24(), _arch_swab32() and __arch_swab64() functions
2021-09-03Merge branch 'akpm' (patches from Andrew)Linus Torvalds1-6/+2
Merge misc updates from Andrew Morton: "173 patches. Subsystems affected by this series: ia64, ocfs2, block, and mm (debug, pagecache, gup, swap, shmem, memcg, selftests, pagemap, mremap, bootmem, sparsemem, vmalloc, kasan, pagealloc, memory-failure, hugetlb, userfaultfd, vmscan, compaction, mempolicy, memblock, oom-kill, migration, ksm, percpu, vmstat, and madvise)" * emailed patches from Andrew Morton <[email protected]>: (173 commits) mm/madvise: add MADV_WILLNEED to process_madvise() mm/vmstat: remove unneeded return value mm/vmstat: simplify the array size calculation mm/vmstat: correct some wrong comments mm/percpu,c: remove obsolete comments of pcpu_chunk_populated() selftests: vm: add COW time test for KSM pages selftests: vm: add KSM merging time test mm: KSM: fix data type selftests: vm: add KSM merging across nodes test selftests: vm: add KSM zero page merging test selftests: vm: add KSM unmerge test selftests: vm: add KSM merge test mm/migrate: correct kernel-doc notation mm: wire up syscall process_mrelease mm: introduce process_mrelease system call memblock: make memblock_find_in_range method private mm/mempolicy.c: use in_task() in mempolicy_slab_node() mm/mempolicy: unify the create() func for bind/interleave/prefer-many policies mm/mempolicy: advertise new MPOL_PREFERRED_MANY mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY ...
2021-09-03mm: remove flush_kernel_dcache_pageChristoph Hellwig1-6/+2
flush_kernel_dcache_page is a rather confusing interface that implements a subset of flush_dcache_page by not being able to properly handle page cache mapped pages. The only callers left are in the exec code as all other previous callers were incorrect as they could have dealt with page cache pages. Replace the calls to flush_kernel_dcache_page with calls to flush_dcache_page, which for all architectures does either exactly the same thing, can contains one or more of the following: 1) an optimization to defer the cache flush for page cache pages not mapped into userspace 2) additional flushing for mapped page cache pages if cache aliases are possible Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Christoph Hellwig <[email protected]> Acked-by: Linus Torvalds <[email protected]> Reviewed-by: Ira Weiny <[email protected]> Cc: Alex Shi <[email protected]> Cc: Geoff Levand <[email protected]> Cc: Greentime Hu <[email protected]> Cc: Guo Ren <[email protected]> Cc: Helge Deller <[email protected]> Cc: "James E.J. Bottomley" <[email protected]> Cc: Nick Hu <[email protected]> Cc: Paul Cercueil <[email protected]> Cc: Rich Felker <[email protected]> Cc: Russell King <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Ulf Hansson <[email protected]> Cc: Vincent Chen <[email protected]> Cc: Yoshinori Sato <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2021-09-02parisc: Drop __arch_swab16(), arch_swab24(), _arch_swab32() and ↵Helge Deller1-68/+0
__arch_swab64() functions No need to keep those as inline assembly functions, the compiler now generates the same or even better optimized code. Signed-off-by: Helge Deller <[email protected]>
2021-09-02Merge tag 'for-5.15/parisc' of ↵Linus Torvalds3-7/+7
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc architecture updates from Helge Deller: - Fix a kernel crash when a signal is delivered to bad userspace stack - Fix fall-through warnings in math-emu code - Increase size of gcc stack frame check - Switch coding from 'pci_' to 'dma_' API - Make struct parisc_driver::remove() return void - Some parisc related Makefile changes - Minor cleanups, e.g. change to octal permissions, fix macro collisions, fix PMD_ORDER collision, replace spaces with tabs * tag 'for-5.15/parisc' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: math-emu: Fix fall-through warnings parisc: fix crash with signals and alloca parisc: Fix compile failure when building 64-bit kernel natively parisc: ccio-dma.c: Added tab instead of spaces parisc/parport_gsc: switch from 'pci_' to 'dma_' API parisc: move core-y in arch/parisc/Makefile to arch/parisc/Kbuild parisc: switch from 'pci_' to 'dma_' API parisc: Make struct parisc_driver::remove() return void parisc: remove unused arch/parisc/boot/install.sh and its phony target parisc: Rename PMD_ORDER to PMD_TABLE_ORDER parisc: math-emu: Avoid "fmt" macro collision parisc: Increase size of gcc stack frame check parisc: Replace symbolic permissions with octal permissions
2021-08-31Merge tag 'net-next-5.15' of ↵Linus Torvalds2-11/+5
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Enable memcg accounting for various networking objects. BPF: - Introduce bpf timers. - Add perf link and opaque bpf_cookie which the program can read out again, to be used in libbpf-based USDT library. - Add bpf_task_pt_regs() helper to access user space pt_regs in kprobes, to help user space stack unwinding. - Add support for UNIX sockets for BPF sockmap. - Extend BPF iterator support for UNIX domain sockets. - Allow BPF TCP congestion control progs and bpf iterators to call bpf_setsockopt(), e.g. to switch to another congestion control algorithm. Protocols: - Support IOAM Pre-allocated Trace with IPv6. - Support Management Component Transport Protocol. - bridge: multicast: add vlan support. - netfilter: add hooks for the SRv6 lightweight tunnel driver. - tcp: - enable mid-stream window clamping (by user space or BPF) - allow data-less, empty-cookie SYN with TFO_SERVER_COOKIE_NOT_REQD - more accurate DSACK processing for RACK-TLP - mptcp: - add full mesh path manager option - add partial support for MP_FAIL - improve use of backup subflows - optimize option processing - af_unix: add OOB notification support. - ipv6: add IFLA_INET6_RA_MTU to expose MTU value advertised by the router. - mac80211: Target Wake Time support in AP mode. - can: j1939: extend UAPI to notify about RX status. Driver APIs: - Add page frag support in page pool API. - Many improvements to the DSA (distributed switch) APIs. - ethtool: extend IRQ coalesce uAPI with timer reset modes. - devlink: control which auxiliary devices are created. - Support CAN PHYs via the generic PHY subsystem. - Proper cross-chip support for tag_8021q. - Allow TX forwarding for the software bridge data path to be offloaded to capable devices. Drivers: - veth: more flexible channels number configuration. - openvswitch: introduce per-cpu upcall dispatch. - Add internet mix (IMIX) mode to pktgen. - Transparently handle XDP operations in the bonding driver. - Add LiteETH network driver. - Renesas (ravb): - support Gigabit Ethernet IP - NXP Ethernet switch (sja1105): - fast aging support - support for "H" switch topologies - traffic termination for ports under VLAN-aware bridge - Intel 1G Ethernet - support getcrosststamp() with PCIe PTM (Precision Time Measurement) for better time sync - support Credit-Based Shaper (CBS) offload, enabling HW traffic prioritization and bandwidth reservation - Broadcom Ethernet (bnxt) - support pulse-per-second output - support larger Rx rings - Mellanox Ethernet (mlx5) - support ethtool RSS contexts and MQPRIO channel mode - support LAG offload with bridging - support devlink rate limit API - support packet sampling on tunnels - Huawei Ethernet (hns3): - basic devlink support - add extended IRQ coalescing support - report extended link state - Netronome Ethernet (nfp): - add conntrack offload support - Broadcom WiFi (brcmfmac): - add WPA3 Personal with FT to supported cipher suites - support 43752 SDIO device - Intel WiFi (iwlwifi): - support scanning hidden 6GHz networks - support for a new hardware family (Bz) - Xen pv driver: - harden netfront against malicious backends - Qualcomm mobile - ipa: refactor power management and enable automatic suspend - mhi: move MBIM to WWAN subsystem interfaces Refactor: - Ambient BPF run context and cgroup storage cleanup. - Compat rework for ndo_ioctl. Old code removal: - prism54 remove the obsoleted driver, deprecated by the p54 driver. - wan: remove sbni/granch driver" * tag 'net-next-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1715 commits) net: Add depends on OF_NET for LiteX's LiteETH ipv6: seg6: remove duplicated include net: hns3: remove unnecessary spaces net: hns3: add some required spaces net: hns3: clean up a type mismatch warning net: hns3: refine function hns3_set_default_feature() ipv6: remove duplicated 'net/lwtunnel.h' include net: w5100: check return value after calling platform_get_resource() net/mlxbf_gige: Make use of devm_platform_ioremap_resourcexxx() net: mdio: mscc-miim: Make use of the helper function devm_platform_ioremap_resource() net: mdio-ipq4019: Make use of devm_platform_ioremap_resource() fou: remove sparse errors ipv4: fix endianness issue in inet_rtm_getroute_build_skb() octeontx2-af: Set proper errorcode for IPv4 checksum errors octeontx2-af: Fix static code analyzer reported issues octeontx2-af: Fix mailbox errors in nix_rss_flowkey_cfg octeontx2-af: Fix loop in free and unmap counter af_unix: fix potential NULL deref in unix_dgram_connect() dpaa2-eth: Replace strlcpy with strscpy octeontx2-af: Use NDC TX for transmit packet data ...
2021-08-30parisc: Make struct parisc_driver::remove() return voidUwe Kleine-König1-2/+2
The caller of this function (parisc_driver_remove() in arch/parisc/kernel/drivers.c) ignores the return value, so better don't return any value at all to not wake wrong expectations in driver authors. The only function that could return a non-zero value before was ipmi_parisc_remove() which returns the return value of ipmi_si_remove_by_dev(). Make this function return void, too, as for all other callers the value is ignored, too. Also fold in a small checkpatch fix for: WARNING: Unnecessary space before function pointer arguments + void (*remove) (struct parisc_device *dev); Acked-by: Dmitry Torokhov <[email protected]> (for drivers/input) Signed-off-by: Uwe Kleine-König <[email protected]> Acked-by: Sudip Mukherjee <[email protected]> Acked-by: Jiri Slaby <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-08-30parisc: Rename PMD_ORDER to PMD_TABLE_ORDERMatthew Wilcox (Oracle)2-5/+5
This is the order of the page table allocation, not the order of a PMD. Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> Signed-off-by: Helge Deller <[email protected]>
2021-08-29Revert "parisc: Add assembly implementations for memset, strlen, strcpy, ↵Helge Deller1-15/+0
strncpy and strcat" This reverts commit 83af58f8068ea3f7b3c537c37a30887bfa585069. It turns out that at least the assembly implementation for strncpy() was buggy. Revert the whole commit and return back to the default coding. Signed-off-by: Helge Deller <[email protected]> Cc: <[email protected]> # v5.4+ Cc: Rasmus Villemoes <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2021-08-04sock: allow reading and changing sk_userlocks with setsockoptPavel Tikhomirov1-0/+2
SOCK_SNDBUF_LOCK and SOCK_RCVBUF_LOCK flags disable automatic socket buffers adjustment done by kernel (see tcp_fixup_rcvbuf() and tcp_sndbuf_expand()). If we've just created a new socket this adjustment is enabled on it, but if one changes the socket buffer size by setsockopt(SO_{SND,RCV}BUF*) it becomes disabled. CRIU needs to call setsockopt(SO_{SND,RCV}BUF*) on each socket on restore as it first needs to increase buffer sizes for packet queues restore and second it needs to restore back original buffer sizes. So after CRIU restore all sockets become non-auto-adjustable, which can decrease network performance of restored applications significantly. CRIU need to be able to restore sockets with enabled/disabled adjustment to the same state it was before dump, so let's add special setsockopt for it. Let's also export SOCK_SNDBUF_LOCK and SOCK_RCVBUF_LOCK flags to uAPI so that using these interface one can reenable automatic socket buffer adjustment on their sockets. Signed-off-by: Pavel Tikhomirov <[email protected]> Reviewed-by: Eric Dumazet <[email protected]> Signed-off-by: David S. Miller <[email protected]>
2021-07-23compat: make linux/compat.h available everywhereArnd Bergmann1-11/+3
Parts of linux/compat.h are under an #ifdef, but we end up using more of those over time, moving things around bit by bit. To get it over with once and for all, make all of this file uncondititonal now so it can be accessed everywhere. There are only a few types left that are in asm/compat.h but not yet in the asm-generic version, so add those in the process. This requires providing a few more types in asm-generic/compat.h that were not already there. The only tricky one is compat_sigset_t, which needs a little help on 32-bit architectures and for x86. Signed-off-by: Arnd Bergmann <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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