Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Evan Green | 388 | 70.80% | 2 | 40.00% |
Andrew Jones | 160 | 29.20% | 3 | 60.00% |
Total | 548 | 5 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2023 Rivos, Inc */ #include <linux/string.h> #include <linux/types.h> #include <vdso/datapage.h> #include <vdso/helpers.h> extern int riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags); static int riscv_vdso_get_values(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags) { const struct vdso_data *vd = __arch_get_vdso_data(); const struct arch_vdso_data *avd = &vd->arch_data; bool all_cpus = !cpusetsize && !cpus; struct riscv_hwprobe *p = pairs; struct riscv_hwprobe *end = pairs + pair_count; /* * Defer to the syscall for exotic requests. The vdso has answers * stashed away only for the "all cpus" case. If all CPUs are * homogeneous, then this function can handle requests for arbitrary * masks. */ if ((flags != 0) || (!all_cpus && !avd->homogeneous_cpus)) return riscv_hwprobe(pairs, pair_count, cpusetsize, cpus, flags); /* This is something we can handle, fill out the pairs. */ while (p < end) { if (riscv_hwprobe_key_is_valid(p->key)) { p->value = avd->all_cpu_hwprobe_values[p->key]; } else { p->key = -1; p->value = 0; } p++; } return 0; } static int riscv_vdso_get_cpus(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags) { const struct vdso_data *vd = __arch_get_vdso_data(); const struct arch_vdso_data *avd = &vd->arch_data; struct riscv_hwprobe *p = pairs; struct riscv_hwprobe *end = pairs + pair_count; unsigned char *c = (unsigned char *)cpus; bool empty_cpus = true; bool clear_all = false; int i; if (!cpusetsize || !cpus) return -EINVAL; for (i = 0; i < cpusetsize; i++) { if (c[i]) { empty_cpus = false; break; } } if (empty_cpus || flags != RISCV_HWPROBE_WHICH_CPUS || !avd->homogeneous_cpus) return riscv_hwprobe(pairs, pair_count, cpusetsize, cpus, flags); while (p < end) { if (riscv_hwprobe_key_is_valid(p->key)) { struct riscv_hwprobe t = { .key = p->key, .value = avd->all_cpu_hwprobe_values[p->key], }; if (!riscv_hwprobe_pair_cmp(&t, p)) clear_all = true; } else { clear_all = true; p->key = -1; p->value = 0; } p++; } if (clear_all) { for (i = 0; i < cpusetsize; i++) c[i] = 0; } return 0; } /* Add a prototype to avoid -Wmissing-prototypes warning. */ int __vdso_riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags); int __vdso_riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpusetsize, unsigned long *cpus, unsigned int flags) { if (flags & RISCV_HWPROBE_WHICH_CPUS) return riscv_vdso_get_cpus(pairs, pair_count, cpusetsize, cpus, flags); return riscv_vdso_get_values(pairs, pair_count, cpusetsize, cpus, flags); }
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