1 // SPDX-License-Identifier: GPL-2.0
3 * System Control and Management Interface (SCMI) Base Protocol
5 * Copyright (C) 2018-2021 ARM Ltd.
8 #define pr_fmt(fmt) "SCMI Notifications BASE - " fmt
10 #include <linux/module.h>
11 #include <linux/scmi_protocol.h>
16 /* Updated only after ALL the mandatory features for that version are merged */
17 #define SCMI_PROTOCOL_SUPPORTED_VERSION 0x20000
19 #define SCMI_BASE_NUM_SOURCES 1
20 #define SCMI_BASE_MAX_CMD_ERR_COUNT 1024
22 enum scmi_base_protocol_cmd {
23 BASE_DISCOVER_VENDOR = 0x3,
24 BASE_DISCOVER_SUB_VENDOR = 0x4,
25 BASE_DISCOVER_IMPLEMENT_VERSION = 0x5,
26 BASE_DISCOVER_LIST_PROTOCOLS = 0x6,
27 BASE_DISCOVER_AGENT = 0x7,
28 BASE_NOTIFY_ERRORS = 0x8,
29 BASE_SET_DEVICE_PERMISSIONS = 0x9,
30 BASE_SET_PROTOCOL_PERMISSIONS = 0xa,
31 BASE_RESET_AGENT_CONFIGURATION = 0xb,
34 struct scmi_msg_resp_base_attributes {
40 struct scmi_msg_resp_base_discover_agent {
42 u8 name[SCMI_SHORT_NAME_MAX_SIZE];
46 struct scmi_msg_base_error_notify {
48 #define BASE_TP_NOTIFY_ALL BIT(0)
51 struct scmi_base_error_notify_payld {
54 #define IS_FATAL_ERROR(x) ((x) & BIT(31))
55 #define ERROR_CMD_COUNT(x) FIELD_GET(GENMASK(9, 0), (x))
56 __le64 msg_reports[SCMI_BASE_MAX_CMD_ERR_COUNT];
60 * scmi_base_attributes_get() - gets the implementation details
61 * that are associated with the base protocol.
63 * @ph: SCMI protocol handle
65 * Return: 0 on success, else appropriate SCMI error.
67 static int scmi_base_attributes_get(const struct scmi_protocol_handle *ph)
71 struct scmi_msg_resp_base_attributes *attr_info;
72 struct scmi_revision_info *rev = ph->get_priv(ph);
74 ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
75 0, sizeof(*attr_info), &t);
79 ret = ph->xops->do_xfer(ph, t);
81 attr_info = t->rx.buf;
82 rev->num_protocols = attr_info->num_protocols;
83 rev->num_agents = attr_info->num_agents;
86 ph->xops->xfer_put(ph, t);
92 * scmi_base_vendor_id_get() - gets vendor/subvendor identifier ASCII string.
94 * @ph: SCMI protocol handle
95 * @sub_vendor: specify true if sub-vendor ID is needed
97 * Return: 0 on success, else appropriate SCMI error.
100 scmi_base_vendor_id_get(const struct scmi_protocol_handle *ph, bool sub_vendor)
106 struct scmi_revision_info *rev = ph->get_priv(ph);
110 cmd = BASE_DISCOVER_SUB_VENDOR;
111 vendor_id = rev->sub_vendor_id;
112 size = ARRAY_SIZE(rev->sub_vendor_id);
114 cmd = BASE_DISCOVER_VENDOR;
115 vendor_id = rev->vendor_id;
116 size = ARRAY_SIZE(rev->vendor_id);
119 ret = ph->xops->xfer_get_init(ph, cmd, 0, size, &t);
123 ret = ph->xops->do_xfer(ph, t);
125 strscpy(vendor_id, t->rx.buf, size);
127 ph->xops->xfer_put(ph, t);
133 * scmi_base_implementation_version_get() - gets a vendor-specific
134 * implementation 32-bit version. The format of the version number is
137 * @ph: SCMI protocol handle
139 * Return: 0 on success, else appropriate SCMI error.
142 scmi_base_implementation_version_get(const struct scmi_protocol_handle *ph)
147 struct scmi_revision_info *rev = ph->get_priv(ph);
149 ret = ph->xops->xfer_get_init(ph, BASE_DISCOVER_IMPLEMENT_VERSION,
150 0, sizeof(*impl_ver), &t);
154 ret = ph->xops->do_xfer(ph, t);
156 impl_ver = t->rx.buf;
157 rev->impl_ver = le32_to_cpu(*impl_ver);
160 ph->xops->xfer_put(ph, t);
166 * scmi_base_implementation_list_get() - gets the list of protocols it is
167 * OSPM is allowed to access
169 * @ph: SCMI protocol handle
170 * @protocols_imp: pointer to hold the list of protocol identifiers
172 * Return: 0 on success, else appropriate SCMI error.
175 scmi_base_implementation_list_get(const struct scmi_protocol_handle *ph,
181 __le32 *num_skip, *num_ret;
182 u32 tot_num_ret = 0, loop_num_ret;
183 struct device *dev = ph->dev;
184 struct scmi_revision_info *rev = ph->get_priv(ph);
186 ret = ph->xops->xfer_get_init(ph, BASE_DISCOVER_LIST_PROTOCOLS,
187 sizeof(*num_skip), 0, &t);
191 num_skip = t->tx.buf;
193 list = t->rx.buf + sizeof(*num_ret);
199 /* Set the number of protocols to be skipped/already read */
200 *num_skip = cpu_to_le32(tot_num_ret);
202 ret = ph->xops->do_xfer(ph, t);
206 loop_num_ret = le32_to_cpu(*num_ret);
210 if (loop_num_ret > rev->num_protocols - tot_num_ret) {
212 "No. Returned protocols > Total protocols.\n");
216 if (t->rx.len < (sizeof(u32) * 2)) {
217 dev_err(dev, "Truncated reply - rx.len:%zd\n",
223 real_list_sz = t->rx.len - sizeof(u32);
224 calc_list_sz = (1 + (loop_num_ret - 1) / sizeof(u32)) *
226 if (calc_list_sz != real_list_sz) {
228 "Malformed reply - real_sz:%zd calc_sz:%u (loop_num_ret:%d)\n",
229 real_list_sz, calc_list_sz, loop_num_ret);
231 * Bail out if the expected list size is bigger than the
232 * total payload size of the received reply.
234 if (calc_list_sz > real_list_sz) {
240 for (loop = 0; loop < loop_num_ret; loop++)
241 protocols_imp[tot_num_ret + loop] = *(list + loop);
243 tot_num_ret += loop_num_ret;
245 ph->xops->reset_rx_to_maxsz(ph, t);
246 } while (tot_num_ret < rev->num_protocols);
248 ph->xops->xfer_put(ph, t);
254 * scmi_base_discover_agent_get() - discover the name of an agent
256 * @ph: SCMI protocol handle
257 * @id: Agent identifier
258 * @name: Agent identifier ASCII string
260 * An agent id of 0 is reserved to identify the platform itself.
261 * Generally operating system is represented as "OSPM"
263 * Return: 0 on success, else appropriate SCMI error.
265 static int scmi_base_discover_agent_get(const struct scmi_protocol_handle *ph,
269 struct scmi_msg_resp_base_discover_agent *agent_info;
272 ret = ph->xops->xfer_get_init(ph, BASE_DISCOVER_AGENT,
273 sizeof(__le32), sizeof(*agent_info), &t);
277 put_unaligned_le32(id, t->tx.buf);
279 ret = ph->xops->do_xfer(ph, t);
281 agent_info = t->rx.buf;
282 strscpy(name, agent_info->name, SCMI_SHORT_NAME_MAX_SIZE);
285 ph->xops->xfer_put(ph, t);
290 static int scmi_base_error_notify(const struct scmi_protocol_handle *ph,
294 u32 evt_cntl = enable ? BASE_TP_NOTIFY_ALL : 0;
296 struct scmi_msg_base_error_notify *cfg;
298 ret = ph->xops->xfer_get_init(ph, BASE_NOTIFY_ERRORS,
299 sizeof(*cfg), 0, &t);
304 cfg->event_control = cpu_to_le32(evt_cntl);
306 ret = ph->xops->do_xfer(ph, t);
308 ph->xops->xfer_put(ph, t);
312 static int scmi_base_set_notify_enabled(const struct scmi_protocol_handle *ph,
313 u8 evt_id, u32 src_id, bool enable)
317 ret = scmi_base_error_notify(ph, enable);
319 pr_debug("FAIL_ENABLED - evt[%X] ret:%d\n", evt_id, ret);
324 static void *scmi_base_fill_custom_report(const struct scmi_protocol_handle *ph,
325 u8 evt_id, ktime_t timestamp,
326 const void *payld, size_t payld_sz,
327 void *report, u32 *src_id)
330 const struct scmi_base_error_notify_payld *p = payld;
331 struct scmi_base_error_report *r = report;
334 * BaseError notification payload is variable in size but
335 * up to a maximum length determined by the struct ponted by p.
336 * Instead payld_sz is the effective length of this notification
337 * payload so cannot be greater of the maximum allowed size as
340 if (evt_id != SCMI_EVENT_BASE_ERROR_EVENT || sizeof(*p) < payld_sz)
343 r->timestamp = timestamp;
344 r->agent_id = le32_to_cpu(p->agent_id);
345 r->fatal = IS_FATAL_ERROR(le32_to_cpu(p->error_status));
346 r->cmd_count = ERROR_CMD_COUNT(le32_to_cpu(p->error_status));
347 for (i = 0; i < r->cmd_count; i++)
348 r->reports[i] = le64_to_cpu(p->msg_reports[i]);
354 static const struct scmi_event base_events[] = {
356 .id = SCMI_EVENT_BASE_ERROR_EVENT,
357 .max_payld_sz = sizeof(struct scmi_base_error_notify_payld),
358 .max_report_sz = sizeof(struct scmi_base_error_report) +
359 SCMI_BASE_MAX_CMD_ERR_COUNT * sizeof(u64),
363 static const struct scmi_event_ops base_event_ops = {
364 .set_notify_enabled = scmi_base_set_notify_enabled,
365 .fill_custom_report = scmi_base_fill_custom_report,
368 static const struct scmi_protocol_events base_protocol_events = {
369 .queue_sz = 4 * SCMI_PROTO_QUEUE_SZ,
370 .ops = &base_event_ops,
372 .num_events = ARRAY_SIZE(base_events),
373 .num_sources = SCMI_BASE_NUM_SOURCES,
376 static int scmi_base_protocol_init(const struct scmi_protocol_handle *ph)
381 char name[SCMI_SHORT_NAME_MAX_SIZE];
382 struct device *dev = ph->dev;
383 struct scmi_revision_info *rev = scmi_revision_area_get(ph);
385 ret = ph->xops->version_get(ph, &version);
389 rev->major_ver = PROTOCOL_REV_MAJOR(version),
390 rev->minor_ver = PROTOCOL_REV_MINOR(version);
391 ph->set_priv(ph, rev, version);
393 ret = scmi_base_attributes_get(ph);
397 prot_imp = devm_kcalloc(dev, rev->num_protocols, sizeof(u8),
402 scmi_base_vendor_id_get(ph, false);
403 scmi_base_vendor_id_get(ph, true);
404 scmi_base_implementation_version_get(ph);
405 scmi_base_implementation_list_get(ph, prot_imp);
407 scmi_setup_protocol_implemented(ph, prot_imp);
409 dev_info(dev, "SCMI Protocol v%d.%d '%s:%s' Firmware version 0x%x\n",
410 rev->major_ver, rev->minor_ver, rev->vendor_id,
411 rev->sub_vendor_id, rev->impl_ver);
412 dev_dbg(dev, "Found %d protocol(s) %d agent(s)\n", rev->num_protocols,
415 for (id = 0; id < rev->num_agents; id++) {
416 scmi_base_discover_agent_get(ph, id, name);
417 dev_dbg(dev, "Agent %d: %s\n", id, name);
423 static const struct scmi_protocol scmi_base = {
424 .id = SCMI_PROTOCOL_BASE,
426 .instance_init = &scmi_base_protocol_init,
428 .events = &base_protocol_events,
429 .supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION,
432 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(base, scmi_base)