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Date: Fri, 19 Jun 2020 14:38:31 +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
Subject: [PATCH v10 6/9] firmware: arm_scmi: Add Perf notifications support
Make SCMI Perf 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
- inlined MAP_EVT_TO_ENABLE_CMD
- use SCMI_PROTO_QUEUE_SZ
V6 --> V7
- fixed report.timestamp type
- fixed max_payld_sz 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/perf.c | 139 +++++++++++++++++++++++++++++--
include/linux/scmi_protocol.h | 17 ++++
2 files changed, 151 insertions(+), 5 deletions(-)
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 7b8d7cebdac9..dbcd43a3c14d 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -5,15 +5,19 @@
* Copyright (C) 2018 ARM Ltd.
*/
+#define pr_fmt(fmt) "SCMI Notifications PERF - " fmt
+
#include <linux/bits.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
+#include <linux/scmi_protocol.h>
#include <linux/sort.h>
#include "common.h"
+#include "notify.h"
enum scmi_performance_protocol_cmd {
PERF_DOMAIN_ATTRIBUTES = 0x3,
@@ -27,11 +31,6 @@ enum scmi_performance_protocol_cmd {
PERF_DESCRIBE_FASTCHANNEL = 0xb,
};
-enum scmi_performance_protocol_notify {
- PERFORMANCE_LIMITS_CHANGED = 0x0,
- PERFORMANCE_LEVEL_CHANGED = 0x1,
-};
-
struct scmi_opp {
u32 perf;
u32 power;
@@ -86,6 +85,19 @@ 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 +170,11 @@ 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 +505,29 @@ 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)
@@ -722,6 +762,89 @@ static struct scmi_perf_ops perf_ops = {
.fast_switch_possible = scmi_fast_switch_possible,
};
+static bool scmi_perf_set_notify_enabled(const struct scmi_handle *handle,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret, cmd_id;
+
+ if (unlikely(evt_id >= ARRAY_SIZE(evt_2_cmd)))
+ return false;
+
+ cmd_id = evt_2_cmd[evt_id];
+ ret = scmi_perf_level_limits_notify(handle, src_id, cmd_id, enable);
+ if (ret)
+ pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
+ evt_id, src_id, ret);
+
+ return !ret;
+}
+
+static void *scmi_perf_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)
+{
+ void *rep = NULL;
+
+ switch (evt_id) {
+ case SCMI_EVENT_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 SCMI_EVENT_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 = SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED,
+ .max_payld_sz = sizeof(struct scmi_perf_limits_notify_payld),
+ .max_report_sz = sizeof(struct scmi_perf_limits_report),
+ },
+ {
+ .id = SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED,
+ .max_payld_sz = sizeof(struct scmi_perf_level_notify_payld),
+ .max_report_sz = sizeof(struct scmi_perf_level_report),
+ },
+};
+
+static const struct scmi_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;
@@ -754,6 +877,12 @@ 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, SCMI_PROTO_QUEUE_SZ,
+ &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 81dc3b132fda..65ad83ddde70 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -378,6 +378,8 @@ void scmi_protocol_unregister(int protocol_id);
/* SCMI Notification API - Custom Event Reports */
enum scmi_notification_events {
SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
+ SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
+ SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
};
struct scmi_power_state_changed_report {
@@ -387,4 +389,19 @@ struct scmi_power_state_changed_report {
u32 power_state;
};
+struct scmi_perf_limits_report {
+ u64 timestamp;
+ u32 agent_id;
+ u32 domain_id;
+ u32 range_max;
+ u32 range_min;
+};
+
+struct scmi_perf_level_report {
+ u64 timestamp;
+ u32 agent_id;
+ u32 domain_id;
+ u32 performance_level;
+};
+
#endif /* _LINUX_SCMI_PROTOCOL_H */
--
2.17.1
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