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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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7
lib/sbi/sbi_double_trap.c
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@@ -10,6 +10,7 @@
#include <sbi/sbi_console.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_hart.h>
#include <sbi/sbi_sse.h>
#include <sbi/sbi_trap.h>
@@ -28,3 +29,9 @@ int sbi_double_trap_handler(struct sbi_trap_context *tcntx)
return sbi_sse_inject_event(SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP);
}
void sbi_double_trap_init(struct sbi_scratch *scratch)
{
if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SSDBLTRP))
sbi_sse_add_event(SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP, NULL);
}