[RFC PATCH 10/11] firmware: arm_scmi: Add Reset notifications support

Cristian Marussi
2020-01-20T12:24:41Z

Make SCMI Reset protocol register with the notification core.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
drivers/firmware/arm_scmi/reset.c | 126 +++++++++++++++++++++++++++++-
include/linux/scmi_protocol.h | 11 +++
2 files changed, 136 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c
index de73054554f3..528993d62fbb 100644
--- a/drivers/firmware/arm_scmi/reset.c
+++ b/drivers/firmware/arm_scmi/reset.c
@@ -6,6 +6,7 @@
*/

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

enum scmi_reset_protocol_cmd {
RESET_DOMAIN_ATTRIBUTES = 0x3,
@@ -40,6 +41,17 @@ struct scmi_msg_reset_domain_reset {
#define ARCH_COLD_RESET (ARCH_RESET_TYPE | COLD_RESET_STATE)
};

+struct scmi_msg_reset_notify {
+ __le32 id;
+ __le32 event_control;
+#define RESET_TP_NOTIFY_ALL BIT(0)
+};
+
+struct scmi_reset_issued_notify_payld {
+ __le32 domain_id;
+ __le32 reset_state;
+};
+
struct reset_dom_info {
bool async_reset;
bool reset_notify;
@@ -51,8 +63,11 @@ struct scmi_reset_info {
u32 version;
int num_domains;
struct reset_dom_info *dom_info;
+ const struct scmi_handle *handle;
};

+static struct scmi_reset_info *pinfo;
+
static int scmi_reset_attributes_get(const struct scmi_handle *handle,
struct scmi_reset_info *pi)
{
@@ -190,11 +205,101 @@ static struct scmi_reset_ops reset_ops = {
.deassert = scmi_reset_domain_deassert,
};

+static int scmi_reset_notify(const struct scmi_handle *handle, u32 domain_id,
+ bool enable)
+{
+ int ret;
+ u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
+ struct scmi_xfer *t;
+ struct scmi_msg_reset_notify *cfg;
+
+ ret = scmi_xfer_get_init(handle, RESET_NOTIFY,
+ SCMI_PROTOCOL_RESET, sizeof(*cfg), 0, &t);
+ if (ret)
+ return ret;
+
+ cfg = t->tx.buf;
+ cfg->id = cpu_to_le32(domain_id);
+ cfg->event_control = cpu_to_le32(evt_cntl);
+
+ ret = scmi_do_xfer(handle, t);
+
+ scmi_xfer_put(handle, t);
+ return ret;
+}
+
+static bool scmi_reset_set_notify_enabled(u8 evt_id, const u32 *src_id,
+ bool enable)
+{
+ int ret;
+
+ if (src_id) {
+ ret = scmi_reset_notify(pinfo->handle, *src_id, enable);
+ if (ret)
+ pr_warn("Failed enabling SCMI Notifications - Reset - evt[%X] dom[%d] - ret:%d\n",
+ evt_id, *src_id, ret);
+ } else {
+ int r, dom;
+
+ ret = 1;
+ for (dom = 0; dom < pinfo->num_domains; dom++) {
+ r = scmi_reset_notify(pinfo->handle, dom, enable);
+ if (r)
+ pr_warn("Failed enabling SCMI Notifications - Reset - evt[%X] dom[%d] - ret:%d\n",
+ evt_id, dom, r);
+ ret *= r;
+ }
+ }
+
+ return !ret ? true : false;
+}
+
+static void *scmi_reset_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 RESET_ISSUED:
+ {
+ const struct scmi_reset_issued_notify_payld *p = payld;
+ struct scmi_reset_issued_report *r = report;
+
+ if (sizeof(*p) != payld_sz)
+ break;
+
+ r->timestamp = timestamp;
+ r->domain_id = le32_to_cpu(p->domain_id);
+ r->reset_state = le32_to_cpu(p->reset_state);
+ *src_id = r->domain_id;
+ rep = r;
+ break;
+ }
+ default:
+ break;
+ }
+
+ return rep;
+}
+
+static const struct scmi_event reset_events[] = {
+ {
+ .evt_id = RESET_NOTIFY,
+ .max_payld_sz = 8,
+ .max_report_sz = sizeof(struct scmi_reset_issued_report),
+ },
+};
+
+static const struct scmi_protocol_event_ops reset_event_ops = {
+ .set_notify_enabled = scmi_reset_set_notify_enabled,
+ .fill_custom_report = scmi_reset_fill_custom_report,
+};
+
static int scmi_reset_protocol_init(struct scmi_handle *handle)
{
int domain;
u32 version;
- struct scmi_reset_info *pinfo;

scmi_version_get(handle, SCMI_PROTOCOL_RESET, &version);

@@ -218,7 +323,12 @@ static int scmi_reset_protocol_init(struct scmi_handle *handle)
scmi_reset_domain_attributes_get(handle, domain, dom);
}

+ scmi_register_protocol_events(SCMI_PROTOCOL_RESET, PAGE_SIZE,
+ &reset_event_ops, reset_events,
+ ARRAY_SIZE(reset_events));
+
pinfo->version = version;
+ pinfo->handle = handle;
handle->reset_ops = &reset_ops;
handle->reset_priv = pinfo;

@@ -231,3 +341,17 @@ static int __init scmi_reset_init(void)
&scmi_reset_protocol_init);
}
subsys_initcall(scmi_reset_init);
+
+int scmi_register_reset_event_notifier(u8 evt_id, u32 *dom_id,
+ struct notifier_block *nb)
+{
+ return scmi_register_event_notifier(SCMI_PROTOCOL_RESET, evt_id,
+ dom_id, nb);
+}
+
+int scmi_unregister_reset_event_notifier(u8 evt_id, u32 *dom_id,
+ struct notifier_block *nb)
+{
+ return scmi_unregister_event_notifier(SCMI_PROTOCOL_RESET, evt_id,
+ dom_id, nb);
+}
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 833e21af52fe..4af258f07c1e 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -376,4 +376,15 @@ int scmi_register_sensor_event_notifier(u8 evt_id, u32 *sens_id,
int scmi_unregister_sensor_event_notifier(u8 evt_id, u32 *sens_id,
struct notifier_block *nb);

+struct scmi_reset_issued_report {
+ ktime_t timestamp;
+ u32 domain_id;
+ u32 reset_state;
+};
+
+int scmi_register_reset_event_notifier(u8 evt_id, u32 *dom_id,
+ struct notifier_block *nb);
+int scmi_unregister_reset_event_notifier(u8 evt_id, u32 *dom_id,
+ struct notifier_block *nb);
+
#endif /* _LINUX_SCMI_PROTOCOL_H */
--
2.17.1