[PATCH v2 3/4] lib: sbi: sse: add a is_supported_cb() callback

[Clément Léger]

This callback will be used to expose the availability of events based on
the presence of the dependencies (PMU Overflow IRQ for the PMU Overflow
SSE event for instance). Drivers that want to handle an SSE event will
need to register callbacks for the SSE event with at least the
is_supported_cb() callback implemented. Now that this callback is
implemented, set all non software events as not supported by default.

Signed-off-by: Clément Léger <cleger at rivosinc.com>
---
 include/sbi/sbi_sse.h |  5 +++++
 lib/sbi/sbi_sse.c     | 11 +++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/sbi/sbi_sse.h b/include/sbi/sbi_sse.h
index 7419698a..1eab4f8b 100644
--- a/include/sbi/sbi_sse.h
+++ b/include/sbi/sbi_sse.h
@@ -52,6 +52,11 @@ struct sbi_sse_cb_ops {
 	 * Called when the SBI_EXT_SSE_DISABLE is invoked on the event.
 	 */
 	void (*disable_cb)(uint32_t event_id);
+
+	/**
+	 * Called at init to check if an event is supported.
+	 */
+	bool (*is_supported_cb)(uint32_t event_id);
 };
 
 /* Set the callback operations for an event
diff --git a/lib/sbi/sbi_sse.c b/lib/sbi/sbi_sse.c
index 4c186a22..31002a7d 100644
--- a/lib/sbi/sbi_sse.c
+++ b/lib/sbi/sbi_sse.c
@@ -46,10 +46,10 @@ struct sse_event_info {
 };
 
 static struct sse_event_info valid_events[] = {
-	{.event_id = SBI_SSE_EVENT_LOCAL_RAS, .supported = true},
-	{.event_id = SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP, .supported = true},
-	{.event_id = SBI_SSE_EVENT_GLOBAL_RAS, .supported = true},
-	{.event_id = SBI_SSE_EVENT_LOCAL_PMU, .supported = true},
+	{.event_id = SBI_SSE_EVENT_LOCAL_RAS, .supported = false},
+	{.event_id = SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP, .supported = false},
+	{.event_id = SBI_SSE_EVENT_GLOBAL_RAS, .supported = false},
+	{.event_id = SBI_SSE_EVENT_LOCAL_PMU, .supported = false},
 	{.event_id = SBI_SSE_EVENT_LOCAL_SOFTWARE, .supported = true},
 	{.event_id = SBI_SSE_EVENT_GLOBAL_SOFTWARE, .supported = true},
 };
@@ -1106,6 +1106,9 @@ static void sse_event_info_init(void)
 
 	for (i = 0; i < EVENT_COUNT; i++) {
 		info = &valid_events[i];
+		if (info->cb_ops && info->cb_ops->is_supported_cb)
+			info->supported = info->cb_ops->is_supported_cb(info->event_id);
+
 		if (!info->supported)
 			continue;
 
-- 
2.45.2