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linux/arch/riscv/kernel
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Palmer Dabbelt 52420e483d
RISC-V: Provide the frequency of time CSR via hwprobe 
The RISC-V architecture makes a real time counter CSR (via RDTIME
instruction) available for applications in U-mode but there is no
architected mechanism for an application to discover the frequency
the counter is running at. Some applications (e.g., DPDK) use the
time counter for basic performance analysis as well as fine grained
time-keeping.

Add support to the hwprobe system call to export the time CSR
frequency to code running in U-mode.

Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Punit Agrawal <punit.agrawal@bytedance.com>
Link: https://lore.kernel.org/r/20240702033731.71955-2-cuiyunhui@bytedance.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2024-07-26 05:50:51 -07:00
..
compat_vdso Makefile: remove redundant tool coverage variables 2024-05-14 23:35:48 +09:00
pi Makefile: remove redundant tool coverage variables 2024-05-14 23:35:48 +09:00
probes trace: riscv: Remove deprecated kprobe on ftrace support 2024-07-24 06:14:05 -07:00
tests treewide: replace or remove redundant def_bool in Kconfig files 2024-02-20 20:47:45 +09:00
vdso Makefile: remove redundant tool coverage variables 2024-05-14 23:35:48 +09:00
vendor_extensions riscv: Extend cpufeature.c to detect vendor extensions 2024-07-22 15:36:54 -07:00
.gitignore
acpi_numa.c ACPI: RISCV: Add NUMA support based on SRAT and SLIT 2024-07-22 07:13:06 -07:00
acpi.c Merge patch "Enable SPCR table for console output on RISC-V" 2024-07-26 05:50:48 -07:00
alternative.c riscv: errata: Rename defines for Andes 2024-03-12 07:13:12 -07:00
asm-offsets.c ftrace: riscv: move from REGS to ARGS 2024-05-22 16:12:48 -07:00
cacheinfo.c riscv: cacheinfo: initialize cacheinfo's level and type from ACPI PPTT 2024-07-24 07:39:36 -07:00
cfi.c bpf, riscv64/cfi: Support kCFI + BPF on riscv64 2024-03-06 15:18:16 -08:00
compat_signal.c
compat_syscall_table.c riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
copy-unaligned.h RISC-V: Probe for unaligned access speed 2023-09-01 09:06:25 -07:00
copy-unaligned.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
cpu_ops_sbi.c riscv: prevent pt_regs corruption for secondary idle threads 2024-05-30 09:42:51 -07:00
cpu_ops_spinwait.c riscv: prevent pt_regs corruption for secondary idle threads 2024-05-30 09:42:51 -07:00
cpu_ops.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu-hotplug.c riscv: Use the same CPU operations for all CPUs 2024-01-04 15:03:07 -08:00
cpu.c riscv: Add vendor extensions to /proc/cpuinfo 2024-07-22 15:36:55 -07:00
cpufeature.c riscv: Extend cpufeature.c to detect vendor extensions 2024-07-22 15:36:54 -07:00
crash_dump.c
crash_save_regs.S RISC-V: Fixup get incorrect user mode PC for kernel mode regs 2022-08-11 08:54:40 -07:00
efi-header.S riscv: Prepare EFI header for relocatable kernels 2023-04-19 07:46:28 -07:00
efi.c riscv: Use accessors to page table entries instead of direct dereference 2023-12-20 10:48:15 -08:00
elf_kexec.c fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
entry.S riscv: enable HAVE_ARCH_STACKLEAK 2024-07-26 05:50:47 -07:00
fpu.S riscv: typo in comment for get_f64_reg 2024-05-22 16:12:53 -07:00
ftrace.c riscv: patch: Flush the icache right after patching to avoid illegal insns 2024-06-26 07:37:27 -07:00
head.h riscv: entry: Convert to generic entry 2023-03-23 08:47:00 -07:00
head.S riscv: set trap vector earlier 2024-07-12 08:55:31 -07:00
hibernate-asm.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
hibernate.c riscv: hibernate: remove WARN_ON in save_processor_state 2023-06-23 10:06:22 -07:00
image-vars.h efi: move screen_info into efi init code 2023-10-17 16:33:39 +02:00
irq.c Merge patch "drivers: perf: Do not broadcast to other cpus when starting a counter" 2023-11-09 06:44:13 -08:00
jump_label.c riscv: jump_label: Batch icache maintenance 2024-06-26 07:36:27 -07:00
kernel_mode_fpu.c riscv: add support for kernel-mode FPU 2024-05-19 14:36:19 -07:00
kernel_mode_vector.c riscv: vector: allow kernel-mode Vector with preemption 2024-01-16 07:14:02 -08:00
kexec_relocate.S riscv: kexec: Cleanup riscv_kexec_relocate 2023-09-20 02:53:29 -07:00
kgdb.c RISC-V: rename parse_asm.h to insn.h 2022-12-29 06:59:47 -08:00
machine_kexec_file.c
machine_kexec.c riscv: kexec: Avoid deadlock in kexec crash path 2024-07-03 13:11:30 -07:00
Makefile Merge patch series "riscv: Separate vendor extensions from standard extensions" 2024-07-22 15:37:01 -07:00
Makefile.syscalls riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
mcount-dyn.S ftrace: riscv: move from REGS to ARGS 2024-05-22 16:12:48 -07:00
mcount.S riscv: remove MCOUNT_NAME workaround 2024-02-22 15:38:54 -08:00
module-sections.c
module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
paravirt.c RISC-V: KVM: Rename the SBI_STA_SHMEM_DISABLE to a generic name 2024-04-22 11:13:52 +05:30
patch.c RISC-V Patches for the 6.11 Merge Window, Part 1 2024-07-20 09:11:27 -07:00
perf_callchain.c
perf_regs.c
process.c riscv: process: Fix kernel gp leakage 2024-04-04 12:35:05 -07:00
ptrace.c Merge patch series "riscv: Introduce compat-mode helpers & improve arch_get_mmap_end()" 2024-03-20 08:56:05 -07:00
reset.c
return_address.c riscv: add CALLER_ADDRx support 2024-02-22 12:17:47 -08:00
riscv_ksyms.c RISC-V: add infrastructure to allow different str* implementations 2023-01-31 11:43:23 -08:00
sbi-ipi.c riscv: Use IPIs for remote cache/TLB flushes by default 2024-04-29 10:49:26 -07:00
sbi.c riscv: Improve sbi_ecall() code generation by reordering arguments 2024-07-10 13:30:56 -07:00
setup.c ACPI: RISCV: Add NUMA support based on SRAT and SLIT 2024-07-22 07:13:06 -07:00
signal.c riscv: signal: Remove unlikely() from WARN_ON() condition 2024-07-26 05:50:46 -07:00
smp.c riscv: Use IPIs for remote cache/TLB flushes by default 2024-04-29 10:49:26 -07:00
smpboot.c Merge patch series "Add ACPI NUMA support for RISC-V" 2024-07-22 10:31:51 -07:00
soc.c
stacktrace.c riscv: Improve exception and system call latency 2024-07-26 05:50:45 -07:00
suspend_entry.S riscv: Use SYM_*() assembly macros instead of deprecated ones 2023-11-06 09:42:47 -08:00
suspend.c riscv: Do not save the scratch CSR during suspend 2024-04-28 14:50:36 -07:00
sys_hwprobe.c RISC-V: Provide the frequency of time CSR via hwprobe 2024-07-26 05:50:51 -07:00
sys_riscv.c syscalls: mmap(): use unsigned offset type consistently 2024-06-25 15:57:38 +02:00
syscall_table.c riscv: convert to generic syscall table 2024-07-10 14:23:38 +02:00
time.c RISC-V: paravirt: Add skeleton for pv-time support 2023-12-30 11:25:03 +05:30
traps_misaligned.c riscv: misaligned: remove CONFIG_RISCV_M_MODE specific code 2024-04-28 14:50:37 -07:00
traps.c riscv: use KERN_INFO in do_trap 2024-04-04 12:12:14 -07:00
unaligned_access_speed.c riscv: Use kcalloc() instead of kzalloc() 2024-03-20 08:56:07 -07:00
vdso.c riscv: vdso: Use generic union vdso_data_store 2024-02-20 20:56:00 +01:00
vector.c riscv: vector: adjust minimum Vector requirement to ZVE32X 2024-05-30 14:33:10 -07:00
vendor_extensions.c riscv: Extend cpufeature.c to detect vendor extensions 2024-07-22 15:36:54 -07:00
vmcore_info.c crash: split vmcoreinfo exporting code out from crash_core.c 2024-02-23 17:48:22 -08:00
vmlinux-xip.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00
vmlinux.lds.S riscv: Check if the code to patch lies in the exit section 2024-01-09 10:58:59 -08:00