[PATCH 05/18] dbtr: Do not support chain bit

[Nicholas Piggin]

There is no chain bit validation in in SBI, so do not support it.

Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 lib/sbi/sbi_dbtr.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/sbi/sbi_dbtr.c b/lib/sbi/sbi_dbtr.c
index 65c3b2df..224f2350 100644
--- a/lib/sbi/sbi_dbtr.c
+++ b/lib/sbi/sbi_dbtr.c
@@ -466,11 +466,21 @@ static void dbtr_trigger_clear(struct sbi_dbtr_trigger *trig)
 	csr_write(CSR_TDATA2, 0x0);
 }
 
-static int dbtr_trigger_supported(unsigned long type)
+static int dbtr_trigger_supported(unsigned long type, unsigned long tdata)
 {
 	switch (type) {
 	case RISCV_DBTR_TRIG_MCONTROL:
+		/*
+		 * SBI currently does not validate chain bit in install/update
+		 * so we do not support it.
+		 */
+		if (tdata & RV_DBTR_BIT_MASK(MC, CHAIN))
+			return 0;
+		return 1;
 	case RISCV_DBTR_TRIG_MCONTROL6:
+		if (tdata & RV_DBTR_BIT_MASK(MC6, CHAIN))
+			return 0;
+		return 1;
 	case RISCV_DBTR_TRIG_ICOUNT:
 		return 1;
 	default:
@@ -613,7 +623,7 @@ int sbi_dbtr_install_trig(unsigned long smode,
 		recv = (struct sbi_dbtr_data_msg *)(&entry->data);
 		tdata1 = lle_to_cpu(recv->tdata1);
 
-		if (!dbtr_trigger_supported(TDATA1_GET_TYPE(tdata1))) {
+		if (!dbtr_trigger_supported(TDATA1_GET_TYPE(tdata1), tdata1)) {
 			*out = _idx;
 			sbi_hart_protection_unmap_range((unsigned long)shmem_base,
 							trig_count * sizeof(*entry));
-- 
2.51.0