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Date: Mon, 20 Jan 2020 12:23:33 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: sudeep.holla@....com, lukasz.luba@....com,
james.quinlan@...adcom.com, cristian.marussi@....com
Subject: [RFC PATCH 11/11] firmware: arm_scmi: Add Base notifications support
Make SCMI Base protocol register with the notification core.
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
drivers/firmware/arm_scmi/base.c | 125 +++++++++++++++++++++++++++++++
include/linux/scmi_protocol.h | 13 ++++
2 files changed, 138 insertions(+)
diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c
index ce7d9203e41b..ea28b05d5af6 100644
--- a/drivers/firmware/arm_scmi/base.c
+++ b/drivers/firmware/arm_scmi/base.c
@@ -6,6 +6,7 @@
*/
#include "common.h"
+#include "notify.h"
enum scmi_base_protocol_cmd {
BASE_DISCOVER_VENDOR = 0x3,
@@ -29,6 +30,21 @@ struct scmi_msg_resp_base_attributes {
__le16 reserved;
};
+struct scmi_msg_base_error_notify {
+ __le32 event_control;
+#define BASE_TP_NOTIFY_ALL BIT(0)
+};
+
+struct scmi_base_error_notify_payld {
+ __le32 agent_id;
+ __le32 error_status;
+#define IS_FATAL_ERROR(x) ((x) & BIT(31))
+#define ERROR_CMD_COUNT(x) FIELD_GET(GENMASK(9, 0), (x))
+ __le64 msg_reports[8192];
+};
+
+static const struct scmi_handle *protocol_handle;
+
/**
* scmi_base_attributes_get() - gets the implementation details
* that are associated with the base protocol.
@@ -222,6 +238,96 @@ static int scmi_base_discover_agent_get(const struct scmi_handle *handle,
return ret;
}
+static int scmi_base_error_notify(const struct scmi_handle *handle, bool enable)
+{
+ int ret;
+ u32 evt_cntl = enable ? BASE_TP_NOTIFY_ALL : 0;
+ struct scmi_xfer *t;
+ struct scmi_msg_base_error_notify *cfg;
+
+ ret = scmi_xfer_get_init(handle, BASE_NOTIFY_ERRORS,
+ SCMI_PROTOCOL_BASE, sizeof(*cfg), 0, &t);
+ if (ret)
+ return ret;
+
+ cfg = t->tx.buf;
+ cfg->event_control = cpu_to_le32(evt_cntl);
+
+ ret = scmi_do_xfer(handle, t);
+
+ scmi_xfer_put(handle, t);
+ return ret;
+}
+
+static bool scmi_base_set_notify_enabled(u8 evt_id, const u32 *src_id,
+ bool enable)
+{
+ int ret;
+
+ if (!protocol_handle)
+ return false;
+
+ ret = scmi_base_error_notify(protocol_handle, enable);
+ if (ret)
+ pr_warn("Failed enabling SCMI Notifications - Base - evt[%X] ret:%d\n",
+ evt_id, ret);
+
+ return !ret ? true : false;
+}
+
+static void *scmi_base_fill_custom_report(u8 evt_id, u64 timestamp,
+ const void *payld, size_t payld_sz,
+ void *report, u32 *src_id)
+{
+ void *rep = NULL;
+
+ switch (evt_id) {
+ case BASE_ERROR_EVENT:
+ {
+ int i;
+ const struct scmi_base_error_notify_payld *p = payld;
+ struct scmi_base_error_report *r = report;
+
+ /*
+ * BaseError notification payload is variable in size but
+ * up to a maximum length determined by the struct ponted by p.
+ * Instead payld_sz is the effective length of this notification
+ * payload so cannot be greater of the maximum allowed size as
+ * pointed by p.
+ */
+ if (sizeof(*p) < payld_sz)
+ break;
+
+ r->timestamp = timestamp;
+ r->agent_id = le32_to_cpu(p->agent_id);
+ r->fatal = IS_FATAL_ERROR(le32_to_cpu(p->error_status));
+ r->cmd_count = ERROR_CMD_COUNT(le32_to_cpu(p->error_status));
+ for (i = 0; i < r->cmd_count; i++)
+ r->reports[i] = le64_to_cpu(p->msg_reports[i]);
+ *src_id = SCMI_ALL_SRC_IDS;
+ rep = r;
+ break;
+ }
+ default:
+ break;
+ }
+
+ return rep;
+}
+
+static const struct scmi_event base_events[] = {
+ {
+ .evt_id = BASE_ERROR_EVENT,
+ .max_payld_sz = 8192,
+ .max_report_sz = sizeof(struct scmi_base_error_report),
+ },
+};
+
+static const struct scmi_protocol_event_ops base_event_ops = {
+ .set_notify_enabled = scmi_base_set_notify_enabled,
+ .fill_custom_report = scmi_base_fill_custom_report,
+};
+
int scmi_base_protocol_init(struct scmi_handle *h)
{
int id, ret;
@@ -256,10 +362,29 @@ int scmi_base_protocol_init(struct scmi_handle *h)
dev_dbg(dev, "Found %d protocol(s) %d agent(s)\n", rev->num_protocols,
rev->num_agents);
+ scmi_register_protocol_events(SCMI_PROTOCOL_BASE, (4 * PAGE_SIZE),
+ &base_event_ops, base_events,
+ ARRAY_SIZE(base_events));
+
for (id = 0; id < rev->num_agents; id++) {
scmi_base_discover_agent_get(handle, id, name);
dev_dbg(dev, "Agent %d: %s\n", id, name);
}
+ protocol_handle = handle;
return 0;
}
+
+int scmi_register_base_event_notifier(u8 evt_id, u32 *src_id,
+ struct notifier_block *nb)
+{
+ return scmi_register_event_notifier(SCMI_PROTOCOL_BASE, evt_id,
+ src_id, nb);
+}
+
+int scmi_unregister_base_event_notifier(u8 evt_id, u32 *src_id,
+ struct notifier_block *nb)
+{
+ return scmi_unregister_event_notifier(SCMI_PROTOCOL_BASE, evt_id,
+ src_id, nb);
+}
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 4af258f07c1e..24a64e9ba616 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -387,4 +387,17 @@ int scmi_register_reset_event_notifier(u8 evt_id, u32 *dom_id,
int scmi_unregister_reset_event_notifier(u8 evt_id, u32 *dom_id,
struct notifier_block *nb);
+struct scmi_base_error_report {
+ ktime_t timestamp;
+ u32 agent_id;
+ bool fatal;
+ u16 cmd_count;
+ u64 reports[8192];
+};
+
+int scmi_register_base_event_notifier(u8 evt_id, u32 *src_id,
+ struct notifier_block *nb);
+int scmi_unregister_base_event_notifier(u8 evt_id, u32 *src_id,
+ struct notifier_block *nb);
+
#endif /* _LINUX_SCMI_PROTOCOL_H */
--
2.17.1
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