From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- tools/perf/util/llvm-c-helpers.cpp | 196 +++++++++++++++++++++++++++++++++++++ 1 file changed, 196 insertions(+) create mode 100644 tools/perf/util/llvm-c-helpers.cpp (limited to 'tools/perf/util/llvm-c-helpers.cpp') diff --git a/tools/perf/util/llvm-c-helpers.cpp b/tools/perf/util/llvm-c-helpers.cpp new file mode 100644 index 000000000..004081bd1 --- /dev/null +++ b/tools/perf/util/llvm-c-helpers.cpp @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Must come before the linux/compiler.h include, which defines several + * macros (e.g. noinline) that conflict with compiler builtins used + * by LLVM. + */ +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wunused-parameter" /* Needed for LLVM <= 15 */ +#include +#include +#pragma GCC diagnostic pop + +#include +#include +#include +#include +extern "C" { +#include +} +#include "llvm-c-helpers.h" + +extern "C" +char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name); + +using namespace llvm; +using llvm::symbolize::LLVMSymbolizer; + +/* + * Allocate a static LLVMSymbolizer, which will live to the end of the program. + * Unlike the bfd paths, LLVMSymbolizer has its own cache, so we do not need + * to store anything in the dso struct. + */ +static LLVMSymbolizer *get_symbolizer() +{ + static LLVMSymbolizer *instance = nullptr; + if (instance == nullptr) { + LLVMSymbolizer::Options opts; + /* + * LLVM sometimes demangles slightly different from the rest + * of the code, and this mismatch can cause new_inline_sym() + * to get confused and mark non-inline symbol as inlined + * (since the name does not properly match up with base_sym). + * Thus, disable the demangling and let the rest of the code + * handle it. + */ + opts.Demangle = false; + instance = new LLVMSymbolizer(opts); + } + return instance; +} + +/* Returns 0 on error, 1 on success. */ +static int extract_file_and_line(const DILineInfo &line_info, char **file, + unsigned int *line) +{ + if (file) { + if (line_info.FileName == "") { + /* Match the convention of libbfd. */ + *file = nullptr; + } else { + /* The caller expects to get something it can free(). */ + *file = strdup(line_info.FileName.c_str()); + if (*file == nullptr) + return 0; + } + } + if (line) + *line = line_info.Line; + return 1; +} + +extern "C" +int llvm_addr2line(const char *dso_name, u64 addr, + char **file, unsigned int *line, + bool unwind_inlines, + llvm_a2l_frame **inline_frames) +{ + LLVMSymbolizer *symbolizer = get_symbolizer(); + object::SectionedAddress sectioned_addr = { + addr, + object::SectionedAddress::UndefSection + }; + + if (unwind_inlines) { + Expected res_or_err = + symbolizer->symbolizeInlinedCode(dso_name, + sectioned_addr); + if (!res_or_err) + return 0; + unsigned num_frames = res_or_err->getNumberOfFrames(); + if (num_frames == 0) + return 0; + + if (extract_file_and_line(res_or_err->getFrame(0), + file, line) == 0) + return 0; + + *inline_frames = (llvm_a2l_frame *)calloc( + num_frames, sizeof(**inline_frames)); + if (*inline_frames == nullptr) + return 0; + + for (unsigned i = 0; i < num_frames; ++i) { + const DILineInfo &src = res_or_err->getFrame(i); + + llvm_a2l_frame &dst = (*inline_frames)[i]; + if (src.FileName == "") + /* Match the convention of libbfd. */ + dst.filename = nullptr; + else + dst.filename = strdup(src.FileName.c_str()); + dst.funcname = strdup(src.FunctionName.c_str()); + dst.line = src.Line; + + if (dst.filename == nullptr || + dst.funcname == nullptr) { + for (unsigned j = 0; j <= i; ++j) { + zfree(&(*inline_frames)[j].filename); + zfree(&(*inline_frames)[j].funcname); + } + zfree(inline_frames); + return 0; + } + } + + return num_frames; + } else { + if (inline_frames) + *inline_frames = nullptr; + + Expected res_or_err = + symbolizer->symbolizeCode(dso_name, sectioned_addr); + if (!res_or_err) + return 0; + return extract_file_and_line(*res_or_err, file, line); + } +} + +static char * +make_symbol_relative_string(struct dso *dso, const char *sym_name, + u64 addr, u64 base_addr) +{ + if (!strcmp(sym_name, "")) + return NULL; + + char *demangled = dso__demangle_sym(dso, 0, sym_name); + if (base_addr && base_addr != addr) { + char buf[256]; + snprintf(buf, sizeof(buf), "%s+0x%" PRIx64, + demangled ? demangled : sym_name, addr - base_addr); + free(demangled); + return strdup(buf); + } else { + if (demangled) + return demangled; + else + return strdup(sym_name); + } +} + +extern "C" +char *llvm_name_for_code(struct dso *dso, const char *dso_name, u64 addr) +{ + LLVMSymbolizer *symbolizer = get_symbolizer(); + object::SectionedAddress sectioned_addr = { + addr, + object::SectionedAddress::UndefSection + }; + Expected res_or_err = + symbolizer->symbolizeCode(dso_name, sectioned_addr); + if (!res_or_err) { + return NULL; + } + return make_symbol_relative_string( + dso, res_or_err->FunctionName.c_str(), + addr, res_or_err->StartAddress ? *res_or_err->StartAddress : 0); +} + +extern "C" +char *llvm_name_for_data(struct dso *dso, const char *dso_name, u64 addr) +{ + LLVMSymbolizer *symbolizer = get_symbolizer(); + object::SectionedAddress sectioned_addr = { + addr, + object::SectionedAddress::UndefSection + }; + Expected res_or_err = + symbolizer->symbolizeData(dso_name, sectioned_addr); + if (!res_or_err) { + return NULL; + } + return make_symbol_relative_string( + dso, res_or_err->Name.c_str(), + addr, res_or_err->Start); +} -- cgit v1.3.1