aa5af0aa90
Add a vDSO function __vdso_riscv_hwprobe, which can sit in front of the riscv_hwprobe syscall and answer common queries. We stash a copy of static answers for the "all CPUs" case in the vDSO data page. This data is private to the vDSO, so we can decide later to change what's stored there or under what conditions we defer to the syscall. Currently all data can be discovered at boot, so the vDSO function answers all queries when the cpumask is set to the "all CPUs" hint. There's also a boolean in the data that lets the vDSO function know that all CPUs are the same. In that case, the vDSO will also answer queries for arbitrary CPU masks in addition to the "all CPUs" hint. Signed-off-by: Evan Green <evan@rivosinc.com> Link: https://lore.kernel.org/r/20230407231103.2622178-7-evan@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
17 lines
481 B
C
17 lines
481 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __RISCV_ASM_VDSO_DATA_H
|
|
#define __RISCV_ASM_VDSO_DATA_H
|
|
|
|
#include <linux/types.h>
|
|
#include <vdso/datapage.h>
|
|
#include <asm/hwprobe.h>
|
|
|
|
struct arch_vdso_data {
|
|
/* Stash static answers to the hwprobe queries when all CPUs are selected. */
|
|
__u64 all_cpu_hwprobe_values[RISCV_HWPROBE_MAX_KEY + 1];
|
|
|
|
/* Boolean indicating all CPUs have the same static hwprobe values. */
|
|
__u8 homogeneous_cpus;
|
|
};
|
|
|
|
#endif /* __RISCV_ASM_VDSO_DATA_H */
|