1 // SPDX-License-Identifier: GPL-2.0-only
4  * are supported by the hardware.  See Documentation/arch/riscv/hwprobe.rst for
11 #include <asm/sbi.h>
22 	u64 id = -1ULL;  in hwprobe_arch_id()
29 		switch (pair->key) {  in hwprobe_arch_id()
47 		 * If there's a mismatch for the given set, return -1 in the  in hwprobe_arch_id()
51 			id = -1ULL;  in hwprobe_arch_id()
56 	pair->value = id;  in hwprobe_arch_id()
65 	pair->value = 0;  in hwprobe_isa_ext0()
67 		pair->value |= RISCV_HWPROBE_IMA_FD;  in hwprobe_isa_ext0()
70 		pair->value |= RISCV_HWPROBE_IMA_C;  in hwprobe_isa_ext0()
73 		pair->value |= RISCV_HWPROBE_IMA_V;  in hwprobe_isa_ext0()
84 		if (__riscv_isa_extension_available(isainfo->isa, RISCV_ISA_EXT_##ext))	\  in hwprobe_isa_ext0()
85 			pair->value |= RISCV_HWPROBE_EXT_##ext;				\  in hwprobe_isa_ext0()
139 	pair->value &= ~missing;  in hwprobe_isa_ext0()
153 	u64 perf = -1ULL;  in hwprobe_misaligned()
158 		if (perf == -1ULL)  in hwprobe_misaligned()
167 	if (perf == -1ULL)  in hwprobe_misaligned()
176 	switch (pair->key) {  in hwprobe_one_pair()
183 	 * The kernel already assumes that the base single-letter ISA  in hwprobe_one_pair()
189 		pair->value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA;  in hwprobe_one_pair()
197 		pair->value = hwprobe_misaligned(cpus);  in hwprobe_one_pair()
201 		pair->value = 0;  in hwprobe_one_pair()
203 			pair->value = riscv_cboz_block_size;  in hwprobe_one_pair()
208 	 * call, but get their element key set to -1 and value set to 0  in hwprobe_one_pair()
212 		pair->key = -1;  in hwprobe_one_pair()
213 		pair->value = 0;  in hwprobe_one_pair()
229 		return -EINVAL;  in hwprobe_get_values()
245 			return -EFAULT;  in hwprobe_get_values()
253 			return -EINVAL;  in hwprobe_get_values()
259 		if (get_user(pair.key, &pairs->key))  in hwprobe_get_values()
260 			return -EFAULT;  in hwprobe_get_values()
264 		ret = put_user(pair.key, &pairs->key);  in hwprobe_get_values()
266 			ret = put_user(pair.value, &pairs->value);  in hwprobe_get_values()
269 			return -EFAULT;  in hwprobe_get_values()
286 		return -EINVAL;  in hwprobe_get_cpus()
289 		return -EINVAL;  in hwprobe_get_cpus()
296 		return -EFAULT;  in hwprobe_get_cpus()
311 			return -EFAULT;  in hwprobe_get_cpus()
315 			pair = (struct riscv_hwprobe){ .key = -1, };  in hwprobe_get_cpus()
318 				return -EFAULT;  in hwprobe_get_cpus()
343 		return -EFAULT;  in hwprobe_get_cpus()
366 	struct arch_vdso_data *avd = &vd->arch_data;  in init_hwprobe_vdso_data()
381 		avd->all_cpu_hwprobe_values[key] = pair.value;  in init_hwprobe_vdso_data()
394 	 * populated) or any value returns -1 (varies across CPUs), then the  in init_hwprobe_vdso_data()
397 	avd->homogeneous_cpus = id_bitsmash != 0 && id_bitsmash != -1;  in init_hwprobe_vdso_data()