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lib: sbi: sse: allow adding new events

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In order to allow events to be dynamically added, remove the existing
static array of events and use a simply linked list of supported events.
This allows us to move the cb_ops into this list and associated it with
an event_id. Drivers can now register cb_ops before bringing up the sse
core to handle additional events (platform ones for instance).

sbi_sse_init() now allocates as many events as present in the linked
list. Events can now be added with sbi_sse_add_event() which allows to
add new supported events with some callback operations if any. If an
event is not to be supported, then sbi_sse_add_event() should not be
called. This approach currently consider that local events are to be
supported on all harts (ie, they all support the same ISA or
dependencies). If per-hart event availability needs to be supported,
then, an is_supported() callback could be added later and called for
each hart.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Clément Léger
2025-01-10 14:15:54 +01:00
committed by Anup Patel
parent 147978f312
commit 93f7d819fd
5 changed files with 106 additions and 59 deletions
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8
include/sbi/sbi_sse.h
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@@ -54,12 +54,12 @@ struct sbi_sse_cb_ops {
void (*disable_cb)(uint32_t event_id);
};
/* Set the callback operations for an event
* @param event_id Event identifier (SBI_SSE_EVENT_*)
* @param cb_ops Callback operations
/* Add a supported event with associated callback operations
* @param event_id Event identifier (SBI_SSE_EVENT_* or a custom platform one)
* @param cb_ops Callback operations (Can be NULL if any)
* @return 0 on success, error otherwise
*/
int sbi_sse_set_cb_ops(uint32_t event_id, const struct sbi_sse_cb_ops *cb_ops);
int sbi_sse_add_event(uint32_t event_id, const struct sbi_sse_cb_ops *cb_ops);
/* Inject an event to the current hard
* @param event_id Event identifier (SBI_SSE_EVENT_*)