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Message-Id: <20200618172632.42842-10-cristian.marussi@arm.com>
Date: Thu, 18 Jun 2020 18:26:32 +0100
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, Jonathan.Cameron@...wei.com,
cristian.marussi@....com, dave.martin@....com
Subject: [PATCH v9 9/9] firmware: arm_scmi: Add Base notifications support
Make SCMI Base protocol register with the notification core.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
V8 --> V9
- moved pr_info to pr_debug
- removed switch()
- use SCMI_PROTO_QUEUE_SZ
V6 --> V7
- fixed report.timestamp type
- fix max_payld_sz initialization
- fix report layout and initialization
- expose SCMI_EVENT_ in linux/scmi_protocol.h
V5 --> V6
- added handle argument to fill_custom_report()
V4 --> V5
- fixed unsual return construct
V3 --> V4
- scmi_event field renamed
V2 --> V3
- added handle awareness
V1 --> V2
- simplified .set_notify_enabled() implementation moving the ALL_SRCIDs
logic out of protocol. ALL_SRCIDs logic is now in charge of the
notification core, together with proper reference counting of enables
- switched to devres protocol-registration
---
drivers/firmware/arm_scmi/base.c | 109 +++++++++++++++++++++++++++++--
include/linux/scmi_protocol.h | 9 +++
2 files changed, 114 insertions(+), 4 deletions(-)
diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c
index ce7d9203e41b..d5a7878d3fbd 100644
--- a/drivers/firmware/arm_scmi/base.c
+++ b/drivers/firmware/arm_scmi/base.c
@@ -5,7 +5,15 @@
* Copyright (C) 2018 ARM Ltd.
*/
+#define pr_fmt(fmt) "SCMI Notifications BASE - " fmt
+
+#include <linux/scmi_protocol.h>
+
#include "common.h"
+#include "notify.h"
+
+#define SCMI_BASE_NUM_SOURCES 1
+#define SCMI_BASE_MAX_CMD_ERR_COUNT 1024
enum scmi_base_protocol_cmd {
BASE_DISCOVER_VENDOR = 0x3,
@@ -19,16 +27,25 @@ enum scmi_base_protocol_cmd {
BASE_RESET_AGENT_CONFIGURATION = 0xb,
};
-enum scmi_base_protocol_notify {
- BASE_ERROR_EVENT = 0x0,
-};
-
struct scmi_msg_resp_base_attributes {
u8 num_protocols;
u8 num_agents;
__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[SCMI_BASE_MAX_CMD_ERR_COUNT];
+};
+
/**
* scmi_base_attributes_get() - gets the implementation details
* that are associated with the base protocol.
@@ -222,6 +239,84 @@ 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(const struct scmi_handle *handle,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret;
+
+ ret = scmi_base_error_notify(handle, enable);
+ if (ret)
+ pr_debug("FAIL_ENABLED - evt[%X] ret:%d\n", evt_id, ret);
+
+ return !ret;
+}
+
+static void *scmi_base_fill_custom_report(const struct scmi_handle *handle,
+ u8 evt_id, u64 timestamp,
+ const void *payld, size_t payld_sz,
+ void *report, u32 *src_id)
+{
+ 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 (evt_id != SCMI_EVENT_BASE_ERROR_EVENT || sizeof(*p) < payld_sz)
+ return NULL;
+
+ 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 = 0;
+
+ return r;
+}
+
+static const struct scmi_event base_events[] = {
+ {
+ .id = SCMI_EVENT_BASE_ERROR_EVENT,
+ .max_payld_sz = sizeof(struct scmi_base_error_notify_payld),
+ .max_report_sz = sizeof(struct scmi_base_error_report) +
+ SCMI_BASE_MAX_CMD_ERR_COUNT * sizeof(u64),
+ },
+};
+
+static const struct scmi_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;
@@ -256,6 +351,12 @@ 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(handle, SCMI_PROTOCOL_BASE,
+ (4 * SCMI_PROTO_QUEUE_SZ),
+ &base_event_ops, base_events,
+ ARRAY_SIZE(base_events),
+ SCMI_BASE_NUM_SOURCES);
+
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);
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 091263aa5733..bb858d329dae 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -375,6 +375,7 @@ enum scmi_notification_events {
SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
SCMI_EVENT_RESET_ISSUED = 0x0,
+ SCMI_EVENT_BASE_ERROR_EVENT = 0x0,
};
struct scmi_power_state_changed_report {
@@ -413,4 +414,12 @@ struct scmi_reset_issued_report {
u32 reset_state;
};
+struct scmi_base_error_report {
+ u64 timestamp;
+ u32 agent_id;
+ bool fatal;
+ u16 cmd_count;
+ u64 reports[0];
+};
+
#endif /* _LINUX_SCMI_PROTOCOL_H */
--
2.17.1
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