Merge tag 'riscv-for-linus-6.3-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Palmer Dabbelt:
 "There's a bunch of fixes/cleanups throughout the tree as usual, but we
  also have a handful of new features:

   - Various improvements to the extension detection and alternative
     patching infrastructure

   - Zbb-optimized string routines

   - Support for cpu-capacity in the RISC-V DT bindings

   - Zicbom no longer depends on toolchain support

   - Some performance and code size improvements to ftrace

   - Support for ARCH_WANT_LD_ORPHAN_WARN

   - Oops now contain the faulting instruction"

* tag 'riscv-for-linus-6.3-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (67 commits)
  RISC-V: add a spin_shadow_stack declaration
  riscv: mm: hugetlb: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
  riscv: Add header include guards to insn.h
  riscv: alternative: proceed one more instruction for auipc/jalr pair
  riscv: Avoid enabling interrupts in die()
  riscv, mm: Perform BPF exhandler fixup on page fault
  RISC-V: take text_mutex during alternative patching
  riscv: hwcap: Don't alphabetize ISA extension IDs
  RISC-V: fix ordering of Zbb extension
  riscv: jump_label: Fixup unaligned arch_static_branch function
  RISC-V: Only provide the single-letter extensions in HWCAP
  riscv: mm: fix regression due to update_mmu_cache change
  scripts/decodecode: Add support for RISC-V
  riscv: Add instruction dump to RISC-V splats
  riscv: select ARCH_WANT_LD_ORPHAN_WARN for !XIP_KERNEL
  riscv: vmlinux.lds.S: explicitly catch .init.bss sections from EFI stub
  riscv: vmlinux.lds.S: explicitly catch .riscv.attributes sections
  riscv: vmlinux.lds.S: explicitly catch .rela.dyn symbols
  riscv: lds: define RUNTIME_DISCARD_EXIT
  RISC-V: move some stray __RISCV_INSN_FUNCS definitions from kprobes
  ...

Author: torvalds

Documentation/devicetree/bindings/arm/cpus.yaml

@@ -259,7 +259,7 @@ properties:
 
   capacity-dmips-mhz:
     description:
-      u32 value representing CPU capacity (see ./cpu-capacity.txt) in
+      u32 value representing CPU capacity (see ../cpu/cpu-capacity.txt) in
       DMIPS/MHz, relative to highest capacity-dmips-mhz
       in the system.
 

Documentation/devicetree/bindings/arm/cpu-capacity.txt renamed to Documentation/devicetree/bindings/cpu/cpu-capacity.txt

@@ -1,12 +1,12 @@
 ==========================================
-ARM CPUs capacity bindings
+CPU capacity bindings
 ==========================================
 
 ==========================================
 1 - Introduction
 ==========================================
 
-ARM systems may be configured to have cpus with different power/performance
+Some systems may be configured to have cpus with different power/performance
 characteristics within the same chip. In this case, additional information has
 to be made available to the kernel for it to be aware of such differences and
 take decisions accordingly.

Documentation/devicetree/bindings/riscv/cpus.yaml

@@ -114,6 +114,12 @@ properties:
       List of phandles to idle state nodes supported
       by this hart (see ./idle-states.yaml).
 
+  capacity-dmips-mhz:
+    description:
+      u32 value representing CPU capacity (see ../cpu/cpu-capacity.txt) in
+      DMIPS/MHz, relative to highest capacity-dmips-mhz
+      in the system.
+
 required:
   - riscv,isa
   - interrupt-controller

Documentation/riscv/uabi.rst

@@ -3,4 +3,46 @@
 RISC-V Linux User ABI
 =====================
 
+ISA string ordering in /proc/cpuinfo
+------------------------------------
+
+The canonical order of ISA extension names in the ISA string is defined in
+chapter 27 of the unprivileged specification.
+The specification uses vague wording, such as should, when it comes to ordering,
+so for our purposes the following rules apply:
+
+#. Single-letter extensions come first, in canonical order.
+   The canonical order is "IMAFDQLCBKJTPVH".
+
+#. All multi-letter extensions will be separated from other extensions by an
+   underscore.
+
+#. Additional standard extensions (starting with 'Z') will be sorted after
+   single-letter extensions and before any higher-privileged extensions.
+
+#. For additional standard extensions, the first letter following the 'Z'
+   conventionally indicates the most closely related alphabetical
+   extension category. If multiple 'Z' extensions are named, they will be
+   ordered first by category, in canonical order, as listed above, then
+   alphabetically within a category.
+
+#. Standard supervisor-level extensions (starting with 'S') will be listed
+   after standard unprivileged extensions.  If multiple supervisor-level
+   extensions are listed, they will be ordered alphabetically.
+
+#. Standard machine-level extensions (starting with 'Zxm') will be listed
+   after any lower-privileged, standard extensions. If multiple machine-level
+   extensions are listed, they will be ordered alphabetically.
+
+#. Non-standard extensions (starting with 'X') will be listed after all standard
+   extensions. If multiple non-standard extensions are listed, they will be
+   ordered alphabetically.
+
+An example string following the order is::
+
+   rv64imadc_zifoo_zigoo_zafoo_sbar_scar_zxmbaz_xqux_xrux
+
+Misaligned accesses
+-------------------
+
 Misaligned accesses are supported in userspace, but they may perform poorly.

Documentation/scheduler/sched-capacity.rst

@@ -260,7 +260,7 @@ for that purpose.
 
 The arm and arm64 architectures directly map this to the arch_topology driver
 CPU scaling data, which is derived from the capacity-dmips-mhz CPU binding; see
-Documentation/devicetree/bindings/arm/cpu-capacity.txt.
+Documentation/devicetree/bindings/cpu/cpu-capacity.txt.
 
 3.2 Frequency invariance
 ------------------------

Documentation/translations/zh_CN/scheduler/sched-capacity.rst

@@ -233,7 +233,7 @@ CFS调度类基于实体负载跟踪机制（Per-Entity Load Tracking, PELT）
 
 arm和arm64架构直接把这个信息映射到arch_topology驱动的CPU scaling数据中（译注：参考
 arch_topology.h的percpu变量cpu_scale），它是从capacity-dmips-mhz CPU binding中衍生计算
-出来的。参见Documentation/devicetree/bindings/arm/cpu-capacity.txt。
+出来的。参见Documentation/devicetree/bindings/cpu/cpu-capacity.txt。
 
 3.2 频率不变性
 --------------

arch/riscv/Kconfig

@@ -14,10 +14,11 @@ config RISCV
 	def_bool y
 	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
+	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
 	select ARCH_HAS_BINFMT_FLAT
 	select ARCH_HAS_CURRENT_STACK_POINTER
-	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DEBUG_VIRTUAL if MMU
+	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DEBUG_WX
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL
@@ -44,12 +45,14 @@ config RISCV
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
 	select ARCH_WANT_FRAME_POINTERS
 	select ARCH_WANT_GENERAL_HUGETLB
+	select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
 	select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
+	select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL
 	select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
 	select BUILDTIME_TABLE_SORT if MMU
-	select CLONE_BACKWARDS
 	select CLINT_TIMER if !MMU
+	select CLONE_BACKWARDS
 	select COMMON_CLK
 	select CPU_PM if CPU_IDLE
 	select EDAC_SUPPORT
@@ -84,16 +87,16 @@ config RISCV
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
 	select HAVE_ARCH_SECCOMP_FILTER
+	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
-	select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
-	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
 	select HAVE_ARCH_VMAP_STACK if MMU && 64BIT
 	select HAVE_ASM_MODVERSIONS
 	select HAVE_CONTEXT_TRACKING_USER
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_CONTIGUOUS if MMU
 	select HAVE_EBPF_JIT if MMU
+	select HAVE_FUNCTION_ARG_ACCESS_API
 	select HAVE_FUNCTION_ERROR_INJECTION
 	select HAVE_GCC_PLUGINS
 	select HAVE_GENERIC_VDSO if MMU && 64BIT
@@ -110,10 +113,9 @@ config RISCV
 	select HAVE_PERF_USER_STACK_DUMP
 	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
 	select HAVE_REGS_AND_STACK_ACCESS_API
-	select HAVE_FUNCTION_ARG_ACCESS_API
+	select HAVE_RSEQ
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
-	select HAVE_RSEQ
 	select IRQ_DOMAIN
 	select IRQ_FORCED_THREADING
 	select MODULES_USE_ELF_RELA if MODULES
@@ -137,7 +139,7 @@ config RISCV
 	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
 	select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
 	select HAVE_FUNCTION_GRAPH_TRACER
-	select HAVE_FUNCTION_TRACER if !XIP_KERNEL
+	select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
 
 config ARCH_MMAP_RND_BITS_MIN
 	default 18 if 64BIT
@@ -234,9 +236,9 @@ config LOCKDEP_SUPPORT
 config RISCV_DMA_NONCOHERENT
 	bool
 	select ARCH_HAS_DMA_PREP_COHERENT
-	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
-	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_SETUP_DMA_OPS
+	select ARCH_HAS_SYNC_DMA_FOR_CPU
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
 	select DMA_DIRECT_REMAP
 
 config AS_HAS_INSN
@@ -351,11 +353,11 @@ endchoice
 config NUMA
 	bool "NUMA Memory Allocation and Scheduler Support"
 	depends on SMP && MMU
+	select ARCH_SUPPORTS_NUMA_BALANCING
 	select GENERIC_ARCH_NUMA
+	select NEED_PER_CPU_EMBED_FIRST_CHUNK
 	select OF_NUMA
-	select ARCH_SUPPORTS_NUMA_BALANCING
 	select USE_PERCPU_NUMA_NODE_ID
-	select NEED_PER_CPU_EMBED_FIRST_CHUNK
 	help
 	  Enable NUMA (Non-Uniform Memory Access) support.
 
@@ -400,8 +402,8 @@ config RISCV_ISA_SVPBMT
 	bool "SVPBMT extension support"
 	depends on 64BIT && MMU
 	depends on !XIP_KERNEL
-	select RISCV_ALTERNATIVE
 	default y
+	select RISCV_ALTERNATIVE
 	help
 	   Adds support to dynamically detect the presence of the SVPBMT
 	   ISA-extension (Supervisor-mode: page-based memory types) and
@@ -415,20 +417,36 @@ config RISCV_ISA_SVPBMT
 
 	   If you don't know what to do here, say Y.
 
-config TOOLCHAIN_HAS_ZICBOM
+config TOOLCHAIN_HAS_ZBB
 	bool
 	default y
-	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zicbom)
-	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zicbom)
-	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23800
+	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
+	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
+	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
+	depends on AS_IS_GNU
+
+config RISCV_ISA_ZBB
+	bool "Zbb extension support for bit manipulation instructions"
+	depends on TOOLCHAIN_HAS_ZBB
+	depends on !XIP_KERNEL && MMU
+	select RISCV_ALTERNATIVE
+	default y
+	help
+	   Adds support to dynamically detect the presence of the ZBB
+	   extension (basic bit manipulation) and enable its usage.
+
+	   The Zbb extension provides instructions to accelerate a number
+	   of bit-specific operations (count bit population, sign extending,
+	   bitrotation, etc).
+
+	   If you don't know what to do here, say Y.
 
 config RISCV_ISA_ZICBOM
 	bool "Zicbom extension support for non-coherent DMA operation"
-	depends on TOOLCHAIN_HAS_ZICBOM
 	depends on !XIP_KERNEL && MMU
-	select RISCV_DMA_NONCOHERENT
-	select RISCV_ALTERNATIVE
 	default y
+	select RISCV_ALTERNATIVE
+	select RISCV_DMA_NONCOHERENT
 	help
 	   Adds support to dynamically detect the presence of the ZICBOM
 	   extension (Cache Block Management Operations) and enable its
@@ -490,9 +508,9 @@ config RISCV_BOOT_SPINWAIT
 
 config KEXEC
 	bool "Kexec system call"
-	select KEXEC_CORE
-	select HOTPLUG_CPU if SMP
 	depends on MMU
+	select HOTPLUG_CPU if SMP
+	select KEXEC_CORE
 	help
 	  kexec is a system call that implements the ability to shutdown your
 	  current kernel, and to start another kernel. It is like a reboot
@@ -503,10 +521,10 @@ config KEXEC
 
 config KEXEC_FILE
 	bool "kexec file based systmem call"
+	depends on 64BIT && MMU
+	select HAVE_IMA_KEXEC if IMA
 	select KEXEC_CORE
 	select KEXEC_ELF
-	select HAVE_IMA_KEXEC if IMA
-	depends on 64BIT && MMU
 	help
 	  This is new version of kexec system call. This system call is
 	  file based and takes file descriptors as system call argument
@@ -595,15 +613,15 @@ config EFI_STUB
 config EFI
 	bool "UEFI runtime support"
 	depends on OF && !XIP_KERNEL
-	select LIBFDT
-	select UCS2_STRING
-	select EFI_PARAMS_FROM_FDT
-	select EFI_STUB
+	depends on MMU
+	default y
 	select EFI_GENERIC_STUB
+	select EFI_PARAMS_FROM_FDT
 	select EFI_RUNTIME_WRAPPERS
+	select EFI_STUB
+	select LIBFDT
 	select RISCV_ISA_C
-	depends on MMU
-	default y
+	select UCS2_STRING
 	help
 	  This option provides support for runtime services provided
 	  by UEFI firmware (such as non-volatile variables, realtime
@@ -682,8 +700,8 @@ config PORTABLE
 	bool
 	default !NONPORTABLE
 	select EFI
-	select OF
 	select MMU
+	select OF
 
 menu "Power management options"
 

arch/riscv/Kconfig.socs

@@ -43,7 +43,7 @@ config ARCH_SUNXI
 
 config ARCH_VIRT
 	def_bool SOC_VIRT
-	
+
 config SOC_VIRT
 	bool "QEMU Virt Machine"
 	select CLINT_TIMER if RISCV_M_MODE
@@ -88,7 +88,8 @@ config SOC_CANAAN_K210_DTB_BUILTIN
 	  If unsure, say Y.
 
 config ARCH_CANAAN_K210_DTB_SOURCE
-	def_bool SOC_CANAAN_K210_DTB_SOURCE
+	string
+	default SOC_CANAAN_K210_DTB_SOURCE
 
 config SOC_CANAAN_K210_DTB_SOURCE
 	string "Source file for the Canaan Kendryte K210 builtin DTB"

arch/riscv/Makefile

@@ -11,7 +11,11 @@ LDFLAGS_vmlinux :=
 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
 	LDFLAGS_vmlinux := --no-relax
 	KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
-	CC_FLAGS_FTRACE := -fpatchable-function-entry=8
+ifeq ($(CONFIG_RISCV_ISA_C),y)
+	CC_FLAGS_FTRACE := -fpatchable-function-entry=4
+else
+	CC_FLAGS_FTRACE := -fpatchable-function-entry=2
+endif
 endif
 
 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
@@ -58,9 +62,6 @@ riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
 toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
 riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
 
-# Check if the toolchain supports Zicbom extension
-riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZICBOM) := $(riscv-march-y)_zicbom
-
 # Check if the toolchain supports Zihintpause extension
 riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
 

arch/riscv/errata/sifive/errata.c

@@ -4,6 +4,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/memory.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/bug.h>
@@ -107,7 +108,10 @@ void __init_or_module sifive_errata_patch_func(struct alt_entry *begin,
 
 		tmp = (1U << alt->errata_id);
 		if (cpu_req_errata & tmp) {
-			patch_text_nosync(alt->old_ptr, alt->alt_ptr, alt->alt_len);
+			mutex_lock(&text_mutex);
+			patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
+					  alt->alt_len);
+			mutex_lock(&text_mutex);
 			cpu_apply_errata |= tmp;
 		}
 	}