23  * DOC: Trusted Security Module (TSM) Attestation Report Interface
25  * The TSM report interface is a common provider of blobs that facilitate
27  * service. A TSM report combines a user-defined blob (likely a public-key with
28  * a nonce for a key-exchange protocol) with a signed attestation report. That
30  * validate the attestation report. The expectation is that this interface is
32  * own their own report generation instances to generate reports as
35  * The attestation report format is TSM provider specific, when / if a standard
42 	struct tsm_report report;  member
58 	return &state->report;  in to_tsm_report()
61 static struct tsm_report_state *to_state(struct tsm_report *report)  in to_state()  argument
63 	return container_of(report, struct tsm_report_state, report);  in to_state()
66 static int try_advance_write_generation(struct tsm_report *report)  in try_advance_write_generation()  argument
68 	struct tsm_report_state *state = to_state(report);  in try_advance_write_generation()
75 	 * interim read. Stop accepting updates until the current report  in try_advance_write_generation()
87 	struct tsm_report *report = to_tsm_report(cfg);  in tsm_report_privlevel_store()  local
105 	rc = try_advance_write_generation(report);  in tsm_report_privlevel_store()
108 	report->desc.privlevel = val;  in tsm_report_privlevel_store()
125 	struct tsm_report *report = to_tsm_report(cfg);  in tsm_report_inblob_write()  local
129 	rc = try_advance_write_generation(report);  in tsm_report_inblob_write()
133 	report->desc.inblob_len = count;  in tsm_report_inblob_write()
134 	memcpy(report->desc.inblob, buf, count);  in tsm_report_inblob_write()
141 	struct tsm_report *report = to_tsm_report(cfg);  in tsm_report_generation_show()  local
142 	struct tsm_report_state *state = to_state(report);  in tsm_report_generation_show()
156 static ssize_t __read_report(struct tsm_report *report, void *buf, size_t count,  in __read_report()  argument
164 		out = report->outblob;  in __read_report()
165 		len = report->outblob_len;  in __read_report()
167 		out = report->auxblob;  in __read_report()
168 		len = report->auxblob_len;  in __read_report()
180 static ssize_t read_cached_report(struct tsm_report *report, void *buf,  in read_cached_report()  argument
183 	struct tsm_report_state *state = to_state(report);  in read_cached_report()
186 	if (!report->desc.inblob_len)  in read_cached_report()
191 	 * whether the report includes an auxblob or not.  in read_cached_report()
193 	if (!report->outblob ||  in read_cached_report()
197 	return __read_report(report, buf, count, select);  in read_cached_report()
200 static ssize_t tsm_report_read(struct tsm_report *report, void *buf,  in tsm_report_read()  argument
203 	struct tsm_report_state *state = to_state(report);  in tsm_report_read()
207 	/* try to read from the existing report if present and valid... */  in tsm_report_read()
208 	rc = read_cached_report(report, buf, count, select);  in tsm_report_read()
212 	/* slow path, report may need to be regenerated... */  in tsm_report_read()
217 	if (!report->desc.inblob_len)  in tsm_report_read()
220 	/* did another thread already generate this report? */  in tsm_report_read()
221 	if (report->outblob &&  in tsm_report_read()
225 	kvfree(report->outblob);  in tsm_report_read()
226 	kvfree(report->auxblob);  in tsm_report_read()
227 	report->outblob = NULL;  in tsm_report_read()
228 	report->auxblob = NULL;  in tsm_report_read()
229 	rc = ops->report_new(report, provider.data);  in tsm_report_read()
234 	return __read_report(report, buf, count, select);  in tsm_report_read()
240 	struct tsm_report *report = to_tsm_report(cfg);  in tsm_report_outblob_read()  local
242 	return tsm_report_read(report, buf, count, TSM_REPORT);  in tsm_report_outblob_read()
249 	struct tsm_report *report = to_tsm_report(cfg);  in tsm_report_auxblob_read()  local
251 	return tsm_report_read(report, buf, count, TSM_CERTS);  in tsm_report_auxblob_read()
288 	struct tsm_report *report = to_tsm_report(cfg);  in tsm_report_item_release()  local
289 	struct tsm_report_state *state = to_state(report);  in tsm_report_item_release()
291 	kvfree(report->auxblob);  in tsm_report_item_release()
292 	kvfree(report->outblob);  in tsm_report_item_release()
405 	tsm = configfs_register_default_group(root, "report",  in tsm_init()