1 // SPDX-License-Identifier: GPL-2.0-only
4  * are supported by the hardware.  See Documentation/arch/riscv/hwprobe.rst for
13 #include <asm/sbi.h>
24 	u64 id = -1ULL;  in hwprobe_arch_id()
31 		switch (pair->key) {  in hwprobe_arch_id()
49 		 * If there's a mismatch for the given set, return -1 in the  in hwprobe_arch_id()
53 			id = -1ULL;  in hwprobe_arch_id()
58 	pair->value = id;  in hwprobe_arch_id()
67 	pair->value = 0;  in hwprobe_isa_ext0()
69 		pair->value |= RISCV_HWPROBE_IMA_FD;  in hwprobe_isa_ext0()
72 		pair->value |= RISCV_HWPROBE_IMA_C;  in hwprobe_isa_ext0()
75 		pair->value |= RISCV_HWPROBE_IMA_V;  in hwprobe_isa_ext0()
86 		if (__riscv_isa_extension_available(isainfo->isa, RISCV_ISA_EXT_##ext))	\  in hwprobe_isa_ext0()
87 			pair->value |= RISCV_HWPROBE_EXT_##ext;				\  in hwprobe_isa_ext0()
157 	pair->value &= ~missing;  in hwprobe_isa_ext0()
172 	u64 perf = -1ULL;  in hwprobe_misaligned()
177 		if (perf == -1ULL)  in hwprobe_misaligned()
186 	if (perf == -1ULL)  in hwprobe_misaligned()
207 	switch (pair->key) {  in hwprobe_one_pair()
214 	 * The kernel already assumes that the base single-letter ISA  in hwprobe_one_pair()
220 		pair->value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA;  in hwprobe_one_pair()
229 		pair->value = hwprobe_misaligned(cpus);  in hwprobe_one_pair()
233 		pair->value = 0;  in hwprobe_one_pair()
235 			pair->value = riscv_cboz_block_size;  in hwprobe_one_pair()
238 		pair->value = user_max_virt_addr();  in hwprobe_one_pair()
242 		pair->value = riscv_timebase;  in hwprobe_one_pair()
247 	 * call, but get their element key set to -1 and value set to 0  in hwprobe_one_pair()
251 		pair->key = -1;  in hwprobe_one_pair()
252 		pair->value = 0;  in hwprobe_one_pair()
268 		return -EINVAL;  in hwprobe_get_values()
284 			return -EFAULT;  in hwprobe_get_values()
292 			return -EINVAL;  in hwprobe_get_values()
298 		if (get_user(pair.key, &pairs->key))  in hwprobe_get_values()
299 			return -EFAULT;  in hwprobe_get_values()
303 		ret = put_user(pair.key, &pairs->key);  in hwprobe_get_values()
305 			ret = put_user(pair.value, &pairs->value);  in hwprobe_get_values()
308 			return -EFAULT;  in hwprobe_get_values()
325 		return -EINVAL;  in hwprobe_get_cpus()
328 		return -EINVAL;  in hwprobe_get_cpus()
335 		return -EFAULT;  in hwprobe_get_cpus()
350 			return -EFAULT;  in hwprobe_get_cpus()
354 			pair = (struct riscv_hwprobe){ .key = -1, };  in hwprobe_get_cpus()
357 				return -EFAULT;  in hwprobe_get_cpus()
382 		return -EFAULT;  in hwprobe_get_cpus()
405 	struct arch_vdso_data *avd = &vd->arch_data;  in init_hwprobe_vdso_data()
420 		avd->all_cpu_hwprobe_values[key] = pair.value;  in init_hwprobe_vdso_data()
433 	 * populated) or any value returns -1 (varies across CPUs), then the  in init_hwprobe_vdso_data()
436 	avd->homogeneous_cpus = id_bitsmash != 0 && id_bitsmash != -1;  in init_hwprobe_vdso_data()