From patchwork Fri Feb 2 22:04:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Namhyung Kim X-Patchwork-Id: 13543507 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39757132467; Fri, 2 Feb 2024 22:05:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706911510; cv=none; b=UbI1WJhzJOKzZa1QhY0d78D3p6dQubkeROlL9daBI4Oq8J9xo3cJCUe1iuJpjsJRYpuEaWSRzbxfWUUVUGxiopf3cBetNQUvL4eAsk0aWQMvCnQK3K90C7fV9tCyOXZo2VX8xrN74bZQTGZTVG8SP6iooEWr47N3QiePFKb9hLE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706911510; c=relaxed/simple; bh=8cuanY9nIKPUghP/dPMClAHP/3p1hi26K3nztrI2MFI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=agG8Z709yo0/mB1R4qPOdvJr5Hq2A6IX/b74DJz1+fpOFUJ3CvDhLhi45txagN54WgKYS3coX0k5xbCYC4xiXA6X/DzPWDLxXWw8AHuLGCMIvnYmneTfXkxbA8jSjGcEu8FXv1M2GOy7GQjm+zsmrrZdEuLMvylii0r8gpiOXtg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TxHn2IiH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TxHn2IiH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5866CC43390; Fri, 2 Feb 2024 22:05:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706911509; bh=8cuanY9nIKPUghP/dPMClAHP/3p1hi26K3nztrI2MFI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TxHn2IiHBRlypqccvr7R1y33hds9O14sWGIbCsicdHXkx2sdrIDnShKjbGjiY6x3O DOxLl3ppa9OEWw8+YoorLHC39SbSIedAHJiF/4IQwBXgQKe/FAdHEWRAqkcoUFVKaB 9s5hrCQQiaLpasPfJCiaGOlbgpb4k6o6ZYrnLJLDP4PARu/upkAU/5CMY1kNLzBhSh 2btZ6QO6LOCiW0JsDeZMgifISkpp3z4iraiN8Ka+qjhMFYfSPkhIzo1065+MjW0Z07 RZJDcmrt/D0cA6Um6u1oToUlo4XkY4/RBKYTkSiwvWSqqeaLvdjRVmw4ATVcdhxtO5 vLTKS3Z+Dtykg== From: Namhyung Kim To: Arnaldo Carvalho de Melo , Ian Rogers Cc: Jiri Olsa , Adrian Hunter , Peter Zijlstra , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org, Linus Torvalds , Stephane Eranian , Masami Hiramatsu , linux-toolchains@vger.kernel.org, linux-trace-devel@vger.kernel.org Subject: [PATCH 13/14] perf annotate-data: Track instructions with a this-cpu variable Date: Fri, 2 Feb 2024 14:04:58 -0800 Message-ID: <20240202220459.527138-14-namhyung@kernel.org> X-Mailer: git-send-email 2.43.0.594.gd9cf4e227d-goog In-Reply-To: <20240202220459.527138-1-namhyung@kernel.org> References: <20240202220459.527138-1-namhyung@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Like global variables, this per-cpu variables should be tracked correctly. Factor our get_global_var_type() to handle both global and per-cpu (for this cpu) variables in the same manner. Signed-off-by: Namhyung Kim --- tools/perf/util/annotate-data.c | 84 +++++++++++++++++++++++---------- 1 file changed, 60 insertions(+), 24 deletions(-) diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c index cebbe17de64a..9d6cc6ac431c 100644 --- a/tools/perf/util/annotate-data.c +++ b/tools/perf/util/annotate-data.c @@ -410,6 +410,37 @@ void update_var_state(struct type_state *state, struct data_loc_info *dloc, } } +static bool get_global_var_type(Dwarf_Die *cu_die, struct map_symbol *ms, u64 ip, + u64 var_addr, const char *var_name, int var_offset, + Dwarf_Die *type_die) +{ + u64 pc; + int offset = var_offset; + bool is_pointer = false; + Dwarf_Die var_die; + + pc = map__rip_2objdump(ms->map, ip); + + /* Try to get the variable by address first */ + if (die_find_variable_by_addr(cu_die, pc, var_addr, &var_die, &offset) && + check_variable(&var_die, type_die, offset, is_pointer) == 0 && + die_get_member_type(type_die, offset, type_die)) + return true; + + if (var_name == NULL) + return false; + + offset = var_offset; + + /* Try to get the name of global variable */ + if (die_find_variable_at(cu_die, var_name, pc, &var_die) && + check_variable(&var_die, type_die, offset, is_pointer) == 0 && + die_get_member_type(type_die, offset, type_die)) + return true; + + return false; +} + /** * update_insn_state - Update type state for an instruction * @state: type state table @@ -473,14 +504,36 @@ void update_insn_state(struct type_state *state, struct data_loc_info *dloc, fbreg = -1; } - /* Case 1. register to register transfers */ + /* Case 1. register to register or segment:offset to register transfers */ if (!src->mem_ref && !dst->mem_ref) { if (!has_reg_type(state, dst->reg1)) return; if (has_reg_type(state, src->reg1)) state->regs[dst->reg1] = state->regs[src->reg1]; - else + else if (map__dso(dloc->ms->map)->kernel && + src->segment == INSN_SEG_X86_GS) { + struct map_symbol *ms = dloc->ms; + int offset = src->offset; + u64 ip = ms->sym->start + dl->al.offset; + const char *var_name = NULL; + u64 var_addr; + + /* + * In kernel, %gs points to a per-cpu region for the + * current CPU. Access with a constant offset should + * be treated as a global variable access. + */ + var_addr = src->offset; + get_percpu_var_info(dloc->thread, ms, dloc->cpumode, + var_addr, &var_name, &offset); + + if (get_global_var_type(cu_die, ms, ip, var_addr, + var_name, offset, &type_die)) { + state->regs[dst->reg1].type = type_die; + state->regs[dst->reg1].ok = true; + } + } else state->regs[dst->reg1].ok = false; } /* Case 2. memory to register transers */ @@ -493,37 +546,20 @@ void update_insn_state(struct type_state *state, struct data_loc_info *dloc, retry: /* Check if it's a global variable */ if (sreg == DWARF_REG_PC) { - Dwarf_Die var_die; struct map_symbol *ms = dloc->ms; int offset = src->offset; u64 ip = ms->sym->start + dl->al.offset; - u64 pc, addr; const char *var_name = NULL; + u64 var_addr; - addr = annotate_calc_pcrel(ms, ip, offset, dl); - pc = map__rip_2objdump(ms->map, ip); - - if (die_find_variable_by_addr(cu_die, pc, addr, - &var_die, &offset) && - check_variable(&var_die, &type_die, offset, - /*is_pointer=*/false) == 0 && - die_get_member_type(&type_die, offset, &type_die)) { - state->regs[dst->reg1].type = type_die; - state->regs[dst->reg1].ok = true; - return; - } + var_addr = annotate_calc_pcrel(ms, ip, offset, dl); - /* Try to get the name of global variable */ - offset = src->offset; get_global_var_info(dloc->thread, ms, ip, dl, - dloc->cpumode, &addr, + dloc->cpumode, &var_addr, &var_name, &offset); - if (var_name && die_find_variable_at(cu_die, var_name, - pc, &var_die) && - check_variable(&var_die, &type_die, offset, - /*is_pointer=*/false) == 0 && - die_get_member_type(&type_die, offset, &type_die)) { + if (get_global_var_type(cu_die, ms, ip, var_addr, + var_name, offset, &type_die)) { state->regs[dst->reg1].type = type_die; state->regs[dst->reg1].ok = true; } else