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Subject[PATCH v4 10/13] firmware: arm_scmi: Add Perf notifications support
Date
Make SCMI Perf protocol register with the notification core.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
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/perf.c | 130 +++++++++++++++++++++++++++++++
include/linux/scmi_protocol.h | 15 ++++
2 files changed, 145 insertions(+)

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 88509ec637d0..1187cff7ed16 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -14,6 +14,7 @@
#include <linux/sort.h>

#include "common.h"
+#include "notify.h"

enum scmi_performance_protocol_cmd {
PERF_DOMAIN_ATTRIBUTES = 0x3,
@@ -86,6 +87,19 @@ struct scmi_perf_notify_level_or_limits {
__le32 notify_enable;
};

+struct scmi_perf_limits_notify_payld {
+ __le32 agent_id;
+ __le32 domain_id;
+ __le32 range_max;
+ __le32 range_min;
+};
+
+struct scmi_perf_level_notify_payld {
+ __le32 agent_id;
+ __le32 domain_id;
+ __le32 performance_level;
+};
+
struct scmi_msg_resp_perf_describe_levels {
__le16 num_returned;
__le16 num_remaining;
@@ -158,6 +172,11 @@ struct scmi_perf_info {
struct perf_dom_info *dom_info;
};

+static enum scmi_performance_protocol_cmd evt_2_cmd[] = {
+ PERF_NOTIFY_LIMITS,
+ PERF_NOTIFY_LEVEL,
+};
+
static int scmi_perf_attributes_get(const struct scmi_handle *handle,
struct scmi_perf_info *pi)
{
@@ -488,6 +507,29 @@ static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
return scmi_perf_mb_level_get(handle, domain, level, poll);
}

+static int scmi_perf_level_limits_notify(const struct scmi_handle *handle,
+ u32 domain, int message_id,
+ bool enable)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_perf_notify_level_or_limits *notify;
+
+ ret = scmi_xfer_get_init(handle, message_id, SCMI_PROTOCOL_PERF,
+ sizeof(*notify), 0, &t);
+ if (ret)
+ return ret;
+
+ notify = t->tx.buf;
+ notify->domain = cpu_to_le32(domain);
+ notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
+
+ ret = scmi_do_xfer(handle, t);
+
+ scmi_xfer_put(handle, t);
+ return ret;
+}
+
static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
{
if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
@@ -710,6 +752,88 @@ static struct scmi_perf_ops perf_ops = {
.est_power_get = scmi_dvfs_est_power_get,
};

+static bool scmi_perf_set_notify_enabled(const struct scmi_handle *handle,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret, cmd_id;
+
+ cmd_id = MAP_EVT_TO_ENABLE_CMD(evt_id, evt_2_cmd);
+ if (cmd_id < 0)
+ return false;
+
+ ret = scmi_perf_level_limits_notify(handle, src_id, cmd_id, enable);
+ if (ret)
+ pr_warn("SCMI Notifications - Proto:%X - FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
+ SCMI_PROTOCOL_PERF, evt_id, src_id, ret);
+
+ return !ret ? true : false;
+}
+
+static void *scmi_perf_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 PERFORMANCE_LIMITS_CHANGED:
+ {
+ const struct scmi_perf_limits_notify_payld *p = payld;
+ struct scmi_perf_limits_report *r = report;
+
+ if (sizeof(*p) != payld_sz)
+ break;
+
+ r->timestamp = timestamp;
+ r->agent_id = le32_to_cpu(p->agent_id);
+ r->domain_id = le32_to_cpu(p->domain_id);
+ r->range_max = le32_to_cpu(p->range_max);
+ r->range_min = le32_to_cpu(p->range_min);
+ *src_id = r->domain_id;
+ rep = r;
+ break;
+ }
+ case PERFORMANCE_LEVEL_CHANGED:
+ {
+ const struct scmi_perf_level_notify_payld *p = payld;
+ struct scmi_perf_level_report *r = report;
+
+ if (sizeof(*p) != payld_sz)
+ break;
+
+ r->timestamp = timestamp;
+ r->agent_id = le32_to_cpu(p->agent_id);
+ r->domain_id = le32_to_cpu(p->domain_id);
+ r->performance_level = le32_to_cpu(p->performance_level);
+ *src_id = r->domain_id;
+ rep = r;
+ break;
+ }
+ default:
+ break;
+ }
+
+ return rep;
+}
+
+static const struct scmi_event perf_events[] = {
+ {
+ .id = PERFORMANCE_LIMITS_CHANGED,
+ .max_payld_sz = 16,
+ .max_report_sz = sizeof(struct scmi_perf_limits_report),
+ },
+ {
+ .id = PERFORMANCE_LEVEL_CHANGED,
+ .max_payld_sz = 12,
+ .max_report_sz = sizeof(struct scmi_perf_level_report),
+ },
+};
+
+static const struct scmi_protocol_event_ops perf_event_ops = {
+ .set_notify_enabled = scmi_perf_set_notify_enabled,
+ .fill_custom_report = scmi_perf_fill_custom_report,
+};
+
static int scmi_perf_protocol_init(struct scmi_handle *handle)
{
int domain;
@@ -742,6 +866,12 @@ static int scmi_perf_protocol_init(struct scmi_handle *handle)
scmi_perf_domain_init_fc(handle, domain, &dom->fc_info);
}

+ scmi_register_protocol_events(handle,
+ SCMI_PROTOCOL_PERF, PAGE_SIZE,
+ &perf_event_ops, perf_events,
+ ARRAY_SIZE(perf_events),
+ pinfo->num_domains);
+
pinfo->version = version;
handle->perf_ops = &perf_ops;
handle->perf_priv = pinfo;
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index baa117f9eda3..5e7c28c8bcac 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -392,4 +392,19 @@ struct scmi_power_state_change_requested_report {
u32 power_state;
};

+struct scmi_perf_limits_report {
+ ktime_t timestamp;
+ u32 agent_id;
+ u32 domain_id;
+ u32 range_max;
+ u32 range_min;
+};
+
+struct scmi_perf_level_report {
+ ktime_t timestamp;
+ u32 agent_id;
+ u32 domain_id;
+ u32 performance_level;
+};
+
#endif /* _LINUX_SCMI_PROTOCOL_H */
--
2.17.1
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