[PATCH v2 3/6] lib: sbi: send a double trap SSE event to supervisor
Clément Léger
cleger at rivosinc.com
Fri Sep 13 07:34:01 PDT 2024
In case the double trap handler is called and the double trap happened
in supervisor mode, send a double trap SSE event.
NOTE: this commit depends on the ratification of the new SSE event
id for double trap [1].
Link: https://lists.riscv.org/g/tech-prs/message/985 [1]
Signed-off-by: Clément Léger <cleger at rivosinc.com>
---
include/sbi/sbi_ecall_interface.h | 1 +
lib/sbi/sbi_double_trap.c | 2 +-
lib/sbi/sbi_sse.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/sbi/sbi_ecall_interface.h b/include/sbi/sbi_ecall_interface.h
index e9a8167..5428fba 100644
--- a/include/sbi/sbi_ecall_interface.h
+++ b/include/sbi/sbi_ecall_interface.h
@@ -379,6 +379,7 @@ enum sbi_sse_state {
/* SBI SSE Event IDs. */
#define SBI_SSE_EVENT_LOCAL_RAS 0x00000000
+#define SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP 0x00000001
#define SBI_SSE_EVENT_LOCAL_PLAT_0_START 0x00004000
#define SBI_SSE_EVENT_LOCAL_PLAT_0_END 0x00007fff
#define SBI_SSE_EVENT_GLOBAL_RAS 0x00008000
diff --git a/lib/sbi/sbi_double_trap.c b/lib/sbi/sbi_double_trap.c
index b961645..60ea0b1 100644
--- a/lib/sbi/sbi_double_trap.c
+++ b/lib/sbi/sbi_double_trap.c
@@ -23,5 +23,5 @@ int sbi_double_trap_handler(struct sbi_trap_context *tcntx)
if (prev_virt)
return sbi_trap_redirect(regs, trap);
- return SBI_ENOTSUPP;
+ return sbi_sse_inject_event(SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP);
}
diff --git a/lib/sbi/sbi_sse.c b/lib/sbi/sbi_sse.c
index 52172fc..b5f076a 100644
--- a/lib/sbi/sbi_sse.c
+++ b/lib/sbi/sbi_sse.c
@@ -41,6 +41,7 @@
static const uint32_t supported_events[] = {
SBI_SSE_EVENT_LOCAL_RAS,
+ SBI_SSE_EVENT_LOCAL_DOUBLE_TRAP,
SBI_SSE_EVENT_GLOBAL_RAS,
SBI_SSE_EVENT_LOCAL_PMU,
SBI_SSE_EVENT_LOCAL_SOFTWARE,
--
2.45.2
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