1 // SPDX-License-Identifier: GPL-2.0-only
6 #include <linux/arm-smccc.h>
18  * struct arm_cca_token_info - a descriptor for the token buffer.
22  * @offset:		Offset within granule to start of buffer in bytes
29 	unsigned long   offset;  member
39 	info->result = rsi_attestation_token_init(info->challenge,  in arm_cca_attestation_init()
40 						  info->challenge_size);  in arm_cca_attestation_init()
44  * arm_cca_attestation_continue - Retrieve the attestation token data.
50  * token retrieval operation must be requested on the same CPU on which the
52  * This helper function is therefore scheduled on the same CPU multiple
63 	size = RSI_GRANULE_SIZE - info->offset;  in arm_cca_attestation_continue()
64 	info->result = rsi_attestation_token_continue(info->granule,  in arm_cca_attestation_continue()
65 						      info->offset, size, &len);  in arm_cca_attestation_continue()
66 	info->offset += len;  in arm_cca_attestation_continue()
70  * arm_cca_report_new - Generate a new attestation token.
77  * and schedule calls to retrieve the attestation token on the same CPU
84  * * %0        - Attestation token generated successfully.
85  * * %-EINVAL  - A parameter was not valid.
86  * * %-ENOMEM  - Out of memory.
87  * * %-EFAULT  - Failed to get IPA for memory page(s).
93 	int cpu;  in arm_cca_report_new()  local
99 	struct tsm_desc *desc = &report->desc;  in arm_cca_report_new()
101 	if (desc->inblob_len < 32 || desc->inblob_len > 64)  in arm_cca_report_new()
102 		return -EINVAL;  in arm_cca_report_new()
106 	 * performed on the same CPU. smp_call_function_single() is used  in arm_cca_report_new()
111 	cpu = smp_processor_id();  in arm_cca_report_new()
113 	info.challenge = desc->inblob;  in arm_cca_report_new()
114 	info.challenge_size = desc->inblob_len;  in arm_cca_report_new()
116 	ret = smp_call_function_single(cpu, arm_cca_attestation_init,  in arm_cca_report_new()
123 		return -EINVAL;  in arm_cca_report_new()
128 		return -ENOMEM;  in arm_cca_report_new()
136 		return -ENOMEM;  in arm_cca_report_new()
144 		info.offset = 0;  in arm_cca_report_new()
147 			 * Schedule a call to retrieve a sub-granule chunk  in arm_cca_report_new()
150 			ret = smp_call_function_single(cpu,  in arm_cca_report_new()
158 			 info.offset < RSI_GRANULE_SIZE);  in arm_cca_report_new()
161 			ret = -ENXIO;  in arm_cca_report_new()
171 		if (WARN_ON(token_size + info.offset > max_size))  in arm_cca_report_new()
173 		memcpy(&token[token_size], buf, info.offset);  in arm_cca_report_new()
174 		token_size += info.offset;  in arm_cca_report_new()
177 	report->outblob = no_free_ptr(token);  in arm_cca_report_new()
179 	report->outblob_len = token_size;  in arm_cca_report_new()
190  * arm_cca_guest_init - Register with the Trusted Security Module (TSM)
194  * * %0        - Registered successfully with the TSM interface.
195  * * %-ENODEV  - The execution context is not an Arm Realm.
196  * * %-EBUSY   - Already registered.
203 		return -ENODEV;  in arm_cca_guest_init()
214  * arm_cca_guest_exit - unregister with the Trusted Security Module (TSM)