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linux/kernel/bpf
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Kumar Kartikeya Dwivedi f6b9a69a9e bpf: Refactor active lock management 
When bpf_spin_lock was introduced originally, there was deliberation on
whether to use an array of lock IDs, but since bpf_spin_lock is limited
to holding a single lock at any given time, we've been using a single ID
to identify the held lock.

In preparation for introducing spin locks that can be taken multiple
times, introduce support for acquiring multiple lock IDs. For this
purpose, reuse the acquired_refs array and store both lock and pointer
references. We tag the entry with REF_TYPE_PTR or REF_TYPE_LOCK to
disambiguate and find the relevant entry. The ptr field is used to track
the map_ptr or btf (for bpf_obj_new allocations) to ensure locks can be
matched with protected fields within the same "allocation", i.e.
bpf_obj_new object or map value.

The struct active_lock is changed to an int as the state is part of the
acquired_refs array, and we only need active_lock as a cheap way of
detecting lock presence.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20241109231430.2475236-2-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
2024-11-11 08:18:51 -08:00
..
preload bpf: make preloaded map iterators to display map elements count 2023-07-06 12:42:25 -07:00
arena.c bpf: Fix remap of arena. 2024-06-18 17:19:46 +02:00
arraymap.c bpf: Prevent tailcall infinite loop caused by freplace 2024-10-16 09:21:18 -07:00
bloom_filter.c bpf: Check bloom filter map value size 2024-03-27 09:56:17 -07:00
bpf_cgrp_storage.c bpf: Add "bool swap_uptrs" arg to bpf_local_storage_update() and bpf_selem_alloc() 2024-10-24 10:25:59 -07:00
bpf_inode_storage.c bpf: Add "bool swap_uptrs" arg to bpf_local_storage_update() and bpf_selem_alloc() 2024-10-24 10:25:59 -07:00
bpf_iter.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
bpf_local_storage.c bpf: Add uptr support in the map_value of the task local storage. 2024-10-24 10:25:59 -07:00
bpf_lru_list.c bpf: Address KCSAN report on bpf_lru_list 2023-05-12 12:01:03 -07:00
bpf_lru_list.h bpf: lru: Remove unused declaration bpf_lru_promote() 2023-08-08 17:21:42 -07:00
bpf_lsm.c bpf, lsm: Remove bpf_lsm_key_free hook 2024-10-08 12:52:40 -07:00
bpf_struct_ops.c bpf: Check unsupported ops from the bpf_struct_ops's cfi_stubs 2024-07-29 12:54:13 -07:00
bpf_task_storage.c bpf: Add uptr support in the map_value of the task local storage. 2024-10-24 10:25:59 -07:00
btf.c bpf: Mark raw_tp arguments with PTR_MAYBE_NULL 2024-11-04 11:37:36 -08:00
btf_iter.c bpf: Remove custom build rule 2024-08-30 08:55:26 -07:00
btf_relocate.c bpf: Remove custom build rule 2024-08-30 08:55:26 -07:00
cgroup.c bpf: Allow bpf_current_task_under_cgroup() with BPF_CGROUP_* 2024-08-19 15:25:30 -07:00
cgroup_iter.c bpf: Let verifier consider {task,cgroup} is trusted in bpf_iter_reg 2023-11-07 15:24:25 -08:00
core.c bpf: Prevent tailcall infinite loop caused by freplace 2024-10-16 09:21:18 -07:00
cpumap.c bpf, cpumap: Move xdp:xdp_cpumap_kthread tracepoint before rcv 2024-09-11 16:32:11 +02:00
cpumask.c bpf: Allow invoking kfuncs from BPF_PROG_TYPE_SYSCALL progs 2024-04-05 10:56:09 -07:00
crypto.c bpf: crypto: make state and IV dynptr nullable 2024-06-13 16:33:04 -07:00
devmap.c bpf: devmap: provide rxq after redirect 2024-10-02 13:48:26 -07:00
disasm.c bpf: add special internal-only MOV instruction to resolve per-CPU addrs 2024-04-03 10:29:55 -07:00
disasm.h bpf: Relicense disassembler as GPL-2.0-only OR BSD-2-Clause 2021-09-02 14:49:23 +02:00
dispatcher.c bpf: Use arch_bpf_trampoline_size 2023-12-06 17:17:20 -08:00
hashtab.c bpf: Call free_htab_elem() after htab_unlock_bucket() 2024-11-11 08:18:30 -08:00
helpers.c bpf: Add open coded version of kmem_cache iterator 2024-11-01 11:08:32 -07:00
inode.c bpf: Preserve param->string when parsing mount options 2024-10-22 12:56:38 -07:00
Kconfig bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of 2024-05-14 00:36:29 -07:00
kmem_cache_iter.c bpf: Add open coded version of kmem_cache iterator 2024-11-01 11:08:32 -07:00
link_iter.c bpf: Add bpf_link iterator 2022-05-10 11:20:45 -07:00
local_storage.c bpf: Replace 8 seq_puts() calls by seq_putc() calls 2024-07-29 12:53:00 -07:00
log.c bpf: Fix print_reg_state's constant scalar dump 2024-10-17 11:06:34 -07:00
lpm_trie.c bpf: Avoid kfree_rcu() under lock in bpf_lpm_trie. 2024-03-29 11:10:41 -07:00
Makefile bpf: Add kmem_cache iterator 2024-10-14 18:33:04 -07:00
map_in_map.c bpf: switch maps to CLASS(fd, ...) 2024-08-13 15:58:17 -07:00
map_in_map.h bpf: Add map and need_defer parameters to .map_fd_put_ptr() 2023-12-04 17:50:26 -08:00
map_iter.c bpf: treewide: Annotate BPF kfuncs in BTF 2024-01-31 20:40:56 -08:00
memalloc.c bpf: Call kfree(obj) only once in free_one() 2024-10-03 17:47:35 -07:00
mmap_unlock_work.h bpf: Introduce helper bpf_find_vma 2021-11-07 11:54:51 -08:00
mprog.c bpf: Handle bpf_mprog_query with NULL entry 2023-10-06 17:11:20 -07:00
net_namespace.c net: Add includes masked by netdevice.h including uapi/bpf.h 2021-12-29 20:03:05 -08:00
offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-09-21 21:49:45 +02:00
percpu_freelist.c bpf: Initialize same number of free nodes for each pcpu_freelist 2022-11-11 12:05:14 -08:00
percpu_freelist.h bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI 2020-10-06 00:04:11 +02:00
prog_iter.c bpf: Refactor bpf_iter_reg to have separate seq_info member 2020-07-25 20:16:32 -07:00
queue_stack_maps.c bpf: Avoid deadlock when using queue and stack maps from NMI 2023-09-11 19:04:49 -07:00
relo_core.c bpf: Remove custom build rule 2024-08-30 08:55:26 -07:00
reuseport_array.c bpf: Use sockfd_put() helper 2024-08-30 08:57:47 -07:00
ringbuf.c bpf: Add MEM_WRITE attribute 2024-10-22 15:42:56 -07:00
stackmap.c bpf: wire up sleepable bpf_get_stack() and bpf_get_task_stack() helpers 2024-09-11 09:58:31 -07:00
syscall.c bpf: Add support for uprobe multi session attach 2024-11-11 08:18:03 -08:00
sysfs_btf.c btf: Avoid weak external references 2024-04-16 16:35:13 +02:00
task_iter.c bpf: Fix iter/task tid filtering 2024-10-17 10:52:18 -07:00
tcx.c bpf, tcx: Get rid of tcx_link_const 2023-10-23 15:01:53 -07:00
tnum.c bpf: simplify tnum output if a fully known constant 2023-12-02 11:36:51 -08:00
token.c bpf: convert bpf_token_create() to CLASS(fd, ...) 2024-09-12 18:58:02 -07:00
trampoline.c bpf: Prevent tailcall infinite loop caused by freplace 2024-10-16 09:21:18 -07:00
verifier.c bpf: Refactor active lock management 2024-11-11 08:18:51 -08:00