1 // SPDX-License-Identifier: GPL-2.0-only
26 	u64 id = -1ULL;  in hwprobe_arch_id()
33 		switch (pair->key) {  in hwprobe_arch_id()
51 		 * If there's a mismatch for the given set, return -1 in the  in hwprobe_arch_id()
55 			id = -1ULL;  in hwprobe_arch_id()
60 	pair->value = id;  in hwprobe_arch_id()
69 	pair->value = 0;  in hwprobe_isa_ext0()
71 		pair->value |= RISCV_HWPROBE_IMA_FD;  in hwprobe_isa_ext0()
74 		pair->value |= RISCV_HWPROBE_IMA_C;  in hwprobe_isa_ext0()
77 		pair->value |= RISCV_HWPROBE_IMA_V;  in hwprobe_isa_ext0()
88 		if (__riscv_isa_extension_available(isainfo->isa, RISCV_ISA_EXT_##ext))	\  in hwprobe_isa_ext0()
89 			pair->value |= RISCV_HWPROBE_EXT_##ext;				\  in hwprobe_isa_ext0()
171 	pair->value &= ~missing;  in hwprobe_isa_ext0()
186 	u64 perf = -1ULL;  in hwprobe_misaligned()
191 		if (perf == -1ULL)  in hwprobe_misaligned()
200 	if (perf == -1ULL)  in hwprobe_misaligned()
222 	u64 perf = -1ULL;  in hwprobe_vec_misaligned()
228 		if (perf == -1ULL)  in hwprobe_vec_misaligned()
237 	if (perf == -1ULL)  in hwprobe_vec_misaligned()
258 	switch (pair->key) {  in hwprobe_one_pair()
265 	 * The kernel already assumes that the base single-letter ISA  in hwprobe_one_pair()
271 		pair->value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA;  in hwprobe_one_pair()
280 		pair->value = hwprobe_misaligned(cpus);  in hwprobe_one_pair()
284 		pair->value = hwprobe_vec_misaligned(cpus);  in hwprobe_one_pair()
288 		pair->value = 0;  in hwprobe_one_pair()
290 			pair->value = riscv_cboz_block_size;  in hwprobe_one_pair()
293 		pair->value = 0;  in hwprobe_one_pair()
295 			pair->value = riscv_cbom_block_size;  in hwprobe_one_pair()
298 		pair->value = user_max_virt_addr();  in hwprobe_one_pair()
302 		pair->value = riscv_timebase;  in hwprobe_one_pair()
315 	 * call, but get their element key set to -1 and value set to 0  in hwprobe_one_pair()
319 		pair->key = -1;  in hwprobe_one_pair()
320 		pair->value = 0;  in hwprobe_one_pair()
325 static int hwprobe_get_values(struct riscv_hwprobe __user *pairs,  in hwprobe_get_values()  argument
336 		return -EINVAL;  in hwprobe_get_values()
352 			return -EFAULT;  in hwprobe_get_values()
355 		 * Userspace must provide at least one online CPU, without that  in hwprobe_get_values()
360 			return -EINVAL;  in hwprobe_get_values()
363 	for (out = 0; out < pair_count; out++, pairs++) {  in hwprobe_get_values()
366 		if (get_user(pair.key, &pairs->key))  in hwprobe_get_values()
367 			return -EFAULT;  in hwprobe_get_values()
371 		ret = put_user(pair.key, &pairs->key);  in hwprobe_get_values()
373 			ret = put_user(pair.value, &pairs->value);  in hwprobe_get_values()
376 			return -EFAULT;  in hwprobe_get_values()
382 static int hwprobe_get_cpus(struct riscv_hwprobe __user *pairs,  in hwprobe_get_cpus()  argument
393 		return -EINVAL;  in hwprobe_get_cpus()
396 		return -EINVAL;  in hwprobe_get_cpus()
403 		return -EFAULT;  in hwprobe_get_cpus()
416 		ret = copy_from_user(&pair, &pairs[i], sizeof(pair));  in hwprobe_get_cpus()
418 			return -EFAULT;  in hwprobe_get_cpus()
422 			pair = (struct riscv_hwprobe){ .key = -1, };  in hwprobe_get_cpus()
423 			ret = copy_to_user(&pairs[i], &pair, sizeof(pair));  in hwprobe_get_cpus()
425 				return -EFAULT;  in hwprobe_get_cpus()
450 		return -EFAULT;  in hwprobe_get_cpus()
455 static int do_riscv_hwprobe(struct riscv_hwprobe __user *pairs,  in do_riscv_hwprobe()  argument
461 		return hwprobe_get_cpus(pairs, pair_count, cpusetsize,  in do_riscv_hwprobe()
464 	return hwprobe_get_values(pairs, pair_count, cpusetsize,  in do_riscv_hwprobe()
487 		avd->all_cpu_hwprobe_values[key] = pair.value;  in init_hwprobe_vdso_data()
500 	 * populated) or any value returns -1 (varies across CPUs), then the  in init_hwprobe_vdso_data()
503 	avd->homogeneous_cpus = id_bitsmash != 0 && id_bitsmash != -1;  in init_hwprobe_vdso_data()
511 SYSCALL_DEFINE5(riscv_hwprobe, struct riscv_hwprobe __user *, pairs,  in SYSCALL_DEFINE5()  argument
515 	return do_riscv_hwprobe(pairs, pair_count, cpusetsize,  in SYSCALL_DEFINE5()