wireguard-linux/arch/riscv/kernel/ftrace.c, branch jd/unified-crypt-queue

riscv: patch code by fixmap mapping

2020-03-26T16:24:55Z

On strict kernel memory permission, the ftrace have to change the permission of text for dynamic patching the intructions. Use riscv_patch_text_nosync() to patch code instead of probe_kernel_write. Signed-off-by: Zong Li Signed-off-by: Palmer Dabbelt

riscv: ftrace: correct the condition logic in function graph tracer

2020-01-03T08:56:37Z

The condition should be logical NOT to assign the hook address to parent address. Because the return value 0 of function_graph_enter upon success. Fixes: e949b6db51dc (riscv/function_graph: Simplify with function_graph_enter()) Signed-off-by: Zong Li Reviewed-by: Steven Rostedt (VMware) Cc: stable@vger.kernel.org Signed-off-by: Paul Walmsley

riscv: add missing newlines to printk messages

2019-02-11T23:34:56Z

Add missing newline characters to printk messages. Also replace two pr_warning with the shorter pr_warn, and fix up the tense of one error message while at it. Signed-off-by: Johan Hovold Signed-off-by: Palmer Dabbelt

riscv: remove unused variable in ftrace

2018-12-21T16:11:26Z

Noticed while building kernel-4.20.0-0.rc5.git2.1.fc30 for Fedora 30/RISCV. [..] BUILDSTDERR: arch/riscv/kernel/ftrace.c: In function 'prepare_ftrace_return': BUILDSTDERR: arch/riscv/kernel/ftrace.c:135:6: warning: unused variable 'err' [-Wunused-variable] BUILDSTDERR: int err; BUILDSTDERR: ^~~ [..] Signed-off-by: David Abdurachmanov Fixes: e949b6db51dc1 ("riscv/function_graph: Simplify with function_graph_enter()") Reviewed-by: Olof Johansson Acked-by: Steven Rostedt (VMware) Signed-off-by: Palmer Dabbelt

riscv/function_graph: Simplify with function_graph_enter()

2018-11-28T01:31:16Z

The function_graph_enter() function does the work of calling the function graph hook function and the management of the shadow stack, simplifying the work done in the architecture dependent prepare_ftrace_return(). Have riscv use the new code, and remove the shadow stack management as well as having to set up the trace structure. This is needed to prepare for a fix of a design bug on how the curr_ret_stack is used. Cc: Greentime Hu Cc: Alan Kao Cc: stable@kernel.org Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") Reviewed-by: Palmer Dabbelt Reviewed-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware)

riscv/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support

2018-04-03T02:59:13Z

In walk_stackframe, the pc now receives the address from calling ftrace_graph_ret_addr instead of manual calculation. Note that the original calculation, pc = frame->ra - 4 is buggy when the instruction at the return address happened to be a compressed inst. But since it is not a critical part of ftrace, it is ignored for now to ease the review process. Cc: Greentime Hu Signed-off-by: Alan Kao Signed-off-by: Palmer Dabbelt

riscv/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support

2018-04-03T02:59:13Z

Cc: Greentime Hu Signed-off-by: Alan Kao Signed-off-by: Palmer Dabbelt

riscv/ftrace: Add dynamic function graph tracer support

2018-04-03T02:59:12Z

Once the function_graph tracer is enabled, a filtered function has the following call sequence: * ftracer_caller ==> on/off by ftrace_make_call/ftrace_make_nop * ftrace_graph_caller * ftrace_graph_call ==> on/off by ftrace_en/disable_ftrace_graph_caller * prepare_ftrace_return Considering the following DYNAMIC_FTRACE_WITH_REGS feature, it would be more extendable to have a ftrace_graph_caller function, instead of calling prepare_ftrace_return directly in ftrace_caller. Cc: Greentime Hu Signed-off-by: Alan Kao Signed-off-by: Palmer Dabbelt

riscv/ftrace: Add dynamic function tracer support

2018-04-03T02:59:12Z

We now have dynamic ftrace with the following added items: * ftrace_make_call, ftrace_make_nop (in kernel/ftrace.c) The two functions turn each recorded call site of filtered functions into a call to ftrace_caller or nops * ftracce_update_ftrace_func (in kernel/ftrace.c) turns the nops at ftrace_call into a call to a generic entry for function tracers. * ftrace_caller (in kernel/mcount-dyn.S) The entry where each _mcount call sites calls to once they are filtered to be traced. Also, this patch fixes the semantic problems in mcount.S, which will be treated as only a reference implementation once we have the dynamic ftrace. Cc: Greentime Hu Signed-off-by: Alan Kao Signed-off-by: Palmer Dabbelt

riscv/ftrace: Add basic support

2018-01-31T03:10:54Z

This patch contains basic ftrace support for RV64I platform. Specifically, function tracer (HAVE_FUNCTION_TRACER), function graph tracer (HAVE_FUNCTION_GRAPH_TRACER), and a frame pointer test (HAVE_FUNCTION_GRAPH_FP_TEST) are implemented following the instructions in Documentation/trace/ftrace-design.txt. Note that the functions in both ftrace.c and setup.c should not be hooked with the compiler's -pg option: to prevent infinite self- referencing for the former, and to ignore early setup stuff for the latter. Signed-off-by: Alan Kao Signed-off-by: Palmer Dabbelt