Intel OpenBMC Linux kernel source tree (mirror) https://git.radix-linux.su/BMC/Intel-BMC/linux.git/atom?h=dev 2015-02-23T09:13:45+00:00 2015-02-23T09:13:45+00:00 Pratyush Anand panand@redhat.com 2015-02-13T04:06:21+00:00 urn:sha1:d0d62230185e9d1a683bfa5cdfe5e520577f68d1 ftrace_enable_ftrace_graph_caller and ftrace_disable_ftrace_graph_caller should replace B(jmp) instruction and not BL(call) instruction. Commit 9f1ae7596aad("arm64: Correct ftrace calls to aarch64_insn_gen_branch_imm()") had a typo and used AARCH64_INSN_BRANCH_LINK instead of AARCH64_INSN_BRANCH_NOLINK. Either instruction will work, as the link register is saved/restored across the branch but this better matches the intention of the code. Signed-off-by: Pratyush Anand <panand@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com> 2014-09-19T11:05:45+00:00 Catalin Marinas catalin.marinas@arm.com 2014-09-19T11:05:45+00:00 urn:sha1:9f1ae7596aad71d18c3e88a3927f3f76b037b8fe The aarch64_insn_gen_branch_imm() function takes an enum as the last argument rather than a bool. It happens to work because AARCH64_INSN_BRANCH_LINK matches 'true' but better to use the actual type. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2014-05-29T08:08:33+00:00 AKASHI Takahiro takahiro.akashi@linaro.org 2014-04-30T09:54:34+00:00 urn:sha1:bd7d38dbdf356e75eb3b1699158c9b8021fd6784 This patch allows "dynamic ftrace" if CONFIG_DYNAMIC_FTRACE is enabled. Here we can turn on and off tracing dynamically per-function base. On arm64, this is done by patching single branch instruction to _mcount() inserted by gcc -pg option. The branch is replaced to NOP initially at kernel start up, and later on, NOP to branch to ftrace_caller() when enabled or branch to NOP when disabled. Please note that ftrace_caller() is a counterpart of _mcount() in case of 'static' ftrace. More details on architecture specific requirements are described in Documentation/trace/ftrace-design.txt. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com> 2014-05-29T08:08:08+00:00 AKASHI Takahiro takahiro.akashi@linaro.org 2014-04-30T09:54:33+00:00 urn:sha1:819e50e25d0ce8a75f5cba815416a6a8573655c4 This patch implements arm64 specific part to support function tracers, such as function (CONFIG_FUNCTION_TRACER), function_graph (CONFIG_FUNCTION_GRAPH_TRACER) and function profiler (CONFIG_FUNCTION_PROFILER). With 'function' tracer, all the functions in the kernel are traced with timestamps in ${sysfs}/tracing/trace. If function_graph tracer is specified, call graph is generated. The kernel must be compiled with -pg option so that _mcount() is inserted at the beginning of functions. This function is called on every function's entry as long as tracing is enabled. In addition, function_graph tracer also needs to be able to probe function's exit. ftrace_graph_caller() & return_to_handler do this by faking link register's value to intercept function's return path. More details on architecture specific requirements are described in Documentation/trace/ftrace-design.txt. Reviewed-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>