5.10-stable patches

added patches:
	riscv-add-caller_addrx-support.patch

diff --git a/queue-5.10/riscv-add-caller_addrx-support.patch b/queue-5.10/riscv-add-caller_addrx-support.patch
new file mode 100644 (file)
index 0000000..1b922ed
--- /dev/null
+++ b/queue-5.10/riscv-add-caller_addrx-support.patch
@@ -0,0 +1,122 @@
+From 680341382da56bd192ebfa4e58eaf4fec2e5bca7 Mon Sep 17 00:00:00 2001
+From: Zong Li <zong.li@sifive.com>
+Date: Fri, 2 Feb 2024 01:51:02 +0000
+Subject: riscv: add CALLER_ADDRx support
+
+From: Zong Li <zong.li@sifive.com>
+
+commit 680341382da56bd192ebfa4e58eaf4fec2e5bca7 upstream.
+
+CALLER_ADDRx returns caller's address at specified level, they are used
+for several tracers. These macros eventually use
+__builtin_return_address(n) to get the caller's address if arch doesn't
+define their own implementation.
+
+In RISC-V, __builtin_return_address(n) only works when n == 0, we need
+to walk the stack frame to get the caller's address at specified level.
+
+data.level started from 'level + 3' due to the call flow of getting
+caller's address in RISC-V implementation. If we don't have additional
+three iteration, the level is corresponding to follows:
+
+callsite -> return_address -> arch_stack_walk -> walk_stackframe
+|           |                 |                  |
+level 3     level 2           level 1            level 0
+
+Fixes: 10626c32e382 ("riscv/ftrace: Add basic support")
+Cc: stable@vger.kernel.org
+Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
+Signed-off-by: Zong Li <zong.li@sifive.com>
+Link: https://lore.kernel.org/r/20240202015102.26251-1-zong.li@sifive.com
+Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/riscv/include/asm/ftrace.h    |    5 +++
+ arch/riscv/kernel/Makefile         |    2 +
+ arch/riscv/kernel/return_address.c |   48 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 55 insertions(+)
+ create mode 100644 arch/riscv/kernel/return_address.c
+
+--- a/arch/riscv/include/asm/ftrace.h
++++ b/arch/riscv/include/asm/ftrace.h
+@@ -25,6 +25,11 @@
+ 
+ #define ARCH_SUPPORTS_FTRACE_OPS 1
+ #ifndef __ASSEMBLY__
++
++extern void *return_address(unsigned int level);
++
++#define ftrace_return_address(n) return_address(n)
++
+ void MCOUNT_NAME(void);
+ static inline unsigned long ftrace_call_adjust(unsigned long addr)
+ {
+--- a/arch/riscv/kernel/Makefile
++++ b/arch/riscv/kernel/Makefile
+@@ -7,6 +7,7 @@ ifdef CONFIG_FTRACE
+ CFLAGS_REMOVE_ftrace.o        = $(CC_FLAGS_FTRACE)
+ CFLAGS_REMOVE_patch.o = $(CC_FLAGS_FTRACE)
+ CFLAGS_REMOVE_sbi.o   = $(CC_FLAGS_FTRACE)
++CFLAGS_REMOVE_return_address.o        = $(CC_FLAGS_FTRACE)
+ endif
+ 
+ extra-y += head.o
+@@ -20,6 +21,7 @@ obj-y        += irq.o
+ obj-y += process.o
+ obj-y += ptrace.o
+ obj-y += reset.o
++obj-y += return_address.o
+ obj-y += setup.o
+ obj-y += signal.o
+ obj-y += syscall_table.o
+--- /dev/null
++++ b/arch/riscv/kernel/return_address.c
+@@ -0,0 +1,48 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ * This code come from arch/arm64/kernel/return_address.c
++ *
++ * Copyright (C) 2023 SiFive.
++ */
++
++#include <linux/export.h>
++#include <linux/kprobes.h>
++#include <linux/stacktrace.h>
++
++struct return_address_data {
++      unsigned int level;
++      void *addr;
++};
++
++static bool save_return_addr(void *d, unsigned long pc)
++{
++      struct return_address_data *data = d;
++
++      if (!data->level) {
++              data->addr = (void *)pc;
++              return false;
++      }
++
++      --data->level;
++
++      return true;
++}
++NOKPROBE_SYMBOL(save_return_addr);
++
++noinline void *return_address(unsigned int level)
++{
++      struct return_address_data data;
++
++      data.level = level + 3;
++      data.addr = NULL;
++
++      arch_stack_walk(save_return_addr, &data, current, NULL);
++
++      if (!data.level)
++              return data.addr;
++      else
++              return NULL;
++
++}
++EXPORT_SYMBOL_GPL(return_address);
++NOKPROBE_SYMBOL(return_address);

diff --git a/queue-5.10/series b/queue-5.10/series
index e437b9d628f2232a87960d429fb73c32475a9d07..d409a7494aad03351b49669c85261706b0596359 100644 (file)
--- a/queue-5.10/series
+++ b/queue-5.10/series
@@ -31,3 +31,4 @@ dmaengine-fsl-qdma-init-irq-after-reg-initialization.patch
 mmc-core-fix-emmc-initialization-with-1-bit-bus-connection.patch
 mmc-sdhci-xenon-add-timeout-for-phy-init-complete.patch
 mmc-sdhci-xenon-fix-phy-init-clock-stability.patch
+riscv-add-caller_addrx-support.patch