kernel/linux.git/arch/powerpc/net, branch v6.18.22

powerpc64/bpf: do not increment tailcall count when prog is NULL

2026-04-02T11:23:28+00:00

commit 521bd39d9d28ce54cbfec7f9b89c94ad4fdb8350 upstream. Do not increment tailcall count, if tailcall did not succeed due to missing BPF program. Fixes: ce0761419fae ("powerpc/bpf: Implement support for tail calls") Cc: stable@vger.kernel.org Tested-by: Venkat Rao Bagalkote Signed-off-by: Hari Bathini Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20260303181031.390073-2-hbathini@linux.ibm.com [ Conflict due to missing feature commit 2ed2d8f6fb38 ("powerpc64/bpf: Support tailcalls with subprogs") resolved accordingly. ] Signed-off-by: Hari Bathini Signed-off-by: Greg Kroah-Hartman

powerpc64/bpf: fix the address returned by bpf_get_func_ip

2026-03-19T15:08:44+00:00

commit 157820264ac3dadfafffad63184b883eb28f9ae0 upstream. bpf_get_func_ip() helper function returns the address of the traced function. It relies on the IP address stored at ctx - 16 by the bpf trampoline. On 64-bit powerpc, this address is recovered from LR accounting for OOL trampoline. But the address stored here was off by 4-bytes. Ensure the address is the actual start of the traced function. Reported-by: Abhishek Dubey Fixes: d243b62b7bd3 ("powerpc64/bpf: Add support for bpf trampolines") Cc: stable@vger.kernel.org Tested-by: Venkat Rao Bagalkote Signed-off-by: Hari Bathini Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20260303181031.390073-3-hbathini@linux.ibm.com Signed-off-by: Greg Kroah-Hartman

powerpc64/bpf: fix kfunc call support

2026-03-19T15:08:44+00:00

commit 01b6ac72729610ae732ca2a66e3a642e23f6cd60 upstream. Commit 61688a82e047 ("powerpc/bpf: enable kfunc call") inadvertently enabled kfunc call support for 32-bit powerpc but that support will not be possible until ABI mismatch between 32-bit powerpc and eBPF is handled in 32-bit powerpc JIT code. Till then, advertise support only for 64-bit powerpc. Also, in powerpc ABI, caller needs to extend the arguments properly based on signedness. The JIT code is responsible for handling this explicitly for kfunc calls as verifier can't handle this for each architecture-specific ABI needs. But this was not taken care of while kfunc call support was enabled for powerpc. Fix it by handling this with bpf_jit_find_kfunc_model() and using zero_extend() & sign_extend() helper functions. Fixes: 61688a82e047 ("powerpc/bpf: enable kfunc call") Cc: stable@vger.kernel.org Signed-off-by: Hari Bathini Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20260303181031.390073-7-hbathini@linux.ibm.com Signed-off-by: Greg Kroah-Hartman

kallsyms/bpf: rename __bpf_address_lookup() to bpf_address_lookup()

2026-02-26T22:59:17+00:00

[ Upstream commit cd6735896d0343942cf3dafb48ce32eb79341990 ] bpf_address_lookup() has been used only in kallsyms_lookup_buildid(). It was supposed to set @modname and @modbuildid when the symbol was in a module. But it always just cleared @modname because BPF symbols were never in a module. And it did not clear @modbuildid because the pointer was not passed. The wrapper is no longer needed. Both @modname and @modbuildid are now always initialized to NULL in kallsyms_lookup_buildid(). Remove the wrapper and rename __bpf_address_lookup() to bpf_address_lookup() because this variant is used everywhere. [akpm@linux-foundation.org: fix loongarch] Link: https://lkml.kernel.org/r/20251128135920.217303-6-pmladek@suse.com Fixes: 9294523e3768 ("module: add printk formats to add module build ID to stacktraces") Signed-off-by: Petr Mladek Acked-by: Alexei Starovoitov Cc: Aaron Tomlin Cc: Daniel Borkman Cc: Daniel Gomez Cc: John Fastabend Cc: Kees Cook Cc: Luis Chamberalin Cc: Marc Rutland Cc: "Masami Hiramatsu (Google)" Cc: Petr Pavlu Cc: Sami Tolvanen Cc: Steven Rostedt (Google) Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin

powerpc64/bpf: Implement PROBE_ATOMIC instructions

2025-09-06T10:19:44+00:00

powerpc supports BPF atomic operations using a loop around Load-And-Reserve(LDARX/LWARX) and Store-Conditional(STDCX/STWCX) instructions gated by sync instructions to enforce full ordering. To implement arena_atomics, arena vm start address is added to the dst_reg to be used for both the LDARX/LWARX and STDCX/STWCX instructions. Further, an exception table entry is added for LDARX/LWARX instruction to land after the loop on fault. At the end of sequence, dst_reg is restored by subtracting arena vm start address. bpf_jit_supports_insn() is introduced to selectively enable instruction support as in other architectures like x86 and arm64. Reviewed-by: Hari Bathini Tested-by: Venkat Rao Bagalkote Signed-off-by: Saket Kumar Bhaskar Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250904100835.1100423-5-skb99@linux.ibm.com

powerpc64/bpf: Introduce bpf_jit_emit_atomic_ops() to emit atomic instructions

2025-09-06T10:19:44+00:00

The existing code for emitting bpf atomic instruction sequences for atomic operations such as XCHG, CMPXCHG, ADD, AND, OR, and XOR has been refactored into a reusable function, bpf_jit_emit_ppc_atomic_op(). It also computes the jump offset and tracks the instruction index for jited LDARX/LWARX to be used in case it causes a fault. Reviewed-by: Hari Bathini Tested-by: Venkat Rao Bagalkote Signed-off-by: Saket Kumar Bhaskar Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250904100835.1100423-4-skb99@linux.ibm.com

powerpc64/bpf: Implement bpf_addr_space_cast instruction

2025-09-06T10:19:43+00:00

LLVM generates bpf_addr_space_cast instruction while translating pointers between native (zero) address space and __attribute__((address_space(N))). The addr_space=0 is reserved as bpf_arena address space. rY = addr_space_cast(rX, 0, 1) is processed by the verifier and converted to normal 32-bit move: wX = wY. rY = addr_space_cast(rX, 1, 0) : used to convert a bpf arena pointer to a pointer in the userspace vma. This has to be converted by the JIT. PPC_RAW_RLDICL_DOT, a variant of PPC_RAW_RLDICL is introduced to set condition register as well. Reviewed-by: Hari Bathini Tested-by: Venkat Rao Bagalkote Signed-off-by: Saket Kumar Bhaskar Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250904100835.1100423-3-skb99@linux.ibm.com

powerpc64/bpf: Implement PROBE_MEM32 pseudo instructions

2025-09-06T10:19:43+00:00

Add support for [LDX | STX | ST], PROBE_MEM32, [B | H | W | DW] instructions. They are similar to PROBE_MEM instructions with the following differences: - PROBE_MEM32 supports store. - PROBE_MEM32 relies on the verifier to clear upper 32-bit of the src/dst register - PROBE_MEM32 adds 64-bit kern_vm_start address (which is stored in _R26 in the prologue). Due to bpf_arena constructions such _R26 + reg + off16 access is guaranteed to be within arena virtual range, so no address check at run-time. - PROBE_MEM32 allows STX and ST. If they fault the store is a nop. When LDX faults the destination register is zeroed. To support these on powerpc, we do tmp1 = _R26 + src/dst reg and then use tmp1 as the new src/dst register. This allows us to reuse most of the code for normal [LDX | STX | ST]. Additionally, bpf_jit_emit_probe_mem_store() is introduced to emit instructions for storing memory values depending on the size (byte, halfword, word, doubleword). Stack layout is adjusted to introduce a new NVR (_R26) and to make BPF_PPC_STACKFRAME quadword aligned (local_tmp_var is increased by 8 bytes). Reviewed-by: Hari Bathini Tested-by: Venkat Rao Bagalkote Signed-off-by: Saket Kumar Bhaskar Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250904100835.1100423-2-skb99@linux.ibm.com

powerpc: Replace ASSEMBLY with ASSEMBLER in non-uapi headers

2025-09-01T07:53:29+00:00

While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembler code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This is bad since macros starting with two underscores are names that are reserved by the C language. It can also be very confusing for the developers when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize now on the __ASSEMBLER__ macro that is provided by the compilers. This is almost a completely mechanical patch (done with a simple "sed -i" statement), apart from tweaking two comments manually in arch/powerpc/include/asm/bug.h and arch/powerpc/include/asm/kasan.h (which did not have proper underscores at the end) and fixing a checkpatch error about spaces in arch/powerpc/include/asm/spu_csa.h. Signed-off-by: Thomas Huth Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250801082007.32904-3-thuth@redhat.com

Merge tag 'powerpc-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2025-08-04T02:15:04+00:00

Pull powerpc fixes from Madhavan Srinivasan: - Fixes for several issues in the powernv PCI hotplug path - Fix htmldoc generation for htm.rst in toctree - Add jit support for load_acquire and store_release in ppc64 bpf jit Thanks to Bjorn Helgaas, Hari Bathini, Puranjay Mohan, Saket Kumar Bhaskar, Shawn Anastasio, Timothy Pearson, and Vishal Parmar * tag 'powerpc-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc64/bpf: Add jit support for load_acquire and store_release docs: powerpc: add htm.rst to toctree PCI: pnv_php: Enable third attention indicator state PCI: pnv_php: Fix surprise plug detection and recovery powerpc/eeh: Make EEH driver device hotplug safe powerpc/eeh: Export eeh_unfreeze_pe() PCI: pnv_php: Work around switches with broken presence detection PCI: pnv_php: Clean up allocated IRQs on unplug

kernel/linux.git/arch/powerpc/net, branch v6.18.22

powerpc64/bpf: do not increment tailcall count when prog is NULL

powerpc64/bpf: fix the address returned by bpf_get_func_ip

powerpc64/bpf: fix kfunc call support

kallsyms/bpf: rename __bpf_address_lookup() to bpf_address_lookup()

powerpc64/bpf: Implement PROBE_ATOMIC instructions

powerpc64/bpf: Introduce bpf_jit_emit_atomic_ops() to emit atomic instructions

powerpc64/bpf: Implement bpf_addr_space_cast instruction

powerpc64/bpf: Implement PROBE_MEM32 pseudo instructions

powerpc: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers

Merge tag 'powerpc-6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

powerpc: Replace ASSEMBLY with ASSEMBLER in non-uapi headers