[PATCH v3 04/23] RISC-V: Add defines for the SBI message proxy extension

Anup Patel
2025-05-11T13:40:38Z

Add defines for the new SBI message proxy extension which is part
of the SBI v3.0 specification.

Co-developed-by: Rahul Pathak <rpathak@ventanamicro.com>
Signed-off-by: Rahul Pathak <rpathak@ventanamicro.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
arch/riscv/include/asm/sbi.h | 60 ++++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 4dd6aafb8468..d295c26a7c26 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -35,6 +35,7 @@ enum sbi_ext_id {
SBI_EXT_DBCN = 0x4442434E,
SBI_EXT_STA = 0x535441,
SBI_EXT_NACL = 0x4E41434C,
+ SBI_EXT_MPXY = 0x4D505859,

/* Experimentals extensions must lie within this range */
SBI_EXT_EXPERIMENTAL_START = 0x08000000,
@@ -402,6 +403,65 @@ enum sbi_ext_nacl_feature {
#define SBI_NACL_SHMEM_SRET_X(__i) ((__riscv_xlen / 8) * (__i))
#define SBI_NACL_SHMEM_SRET_X_LAST 31

+enum sbi_ext_mpxy_fid {
+ SBI_EXT_MPXY_GET_SHMEM_SIZE,
+ SBI_EXT_MPXY_SET_SHMEM,
+ SBI_EXT_MPXY_GET_CHANNEL_IDS,
+ SBI_EXT_MPXY_READ_ATTRS,
+ SBI_EXT_MPXY_WRITE_ATTRS,
+ SBI_EXT_MPXY_SEND_MSG_WITH_RESP,
+ SBI_EXT_MPXY_SEND_MSG_WITHOUT_RESP,
+ SBI_EXT_MPXY_GET_NOTIFICATION_EVENTS,
+};
+
+enum sbi_mpxy_attribute_id {
+ /* Standard channel attributes managed by MPXY framework */
+ SBI_MPXY_ATTR_MSG_PROT_ID = 0x00000000,
+ SBI_MPXY_ATTR_MSG_PROT_VER = 0x00000001,
+ SBI_MPXY_ATTR_MSG_MAX_LEN = 0x00000002,
+ SBI_MPXY_ATTR_MSG_SEND_TIMEOUT = 0x00000003,
+ SBI_MPXY_ATTR_MSG_COMPLETION_TIMEOUT = 0x00000004,
+ SBI_MPXY_ATTR_CHANNEL_CAPABILITY = 0x00000005,
+ SBI_MPXY_ATTR_SSE_EVENT_ID = 0x00000006,
+ SBI_MPXY_ATTR_MSI_CONTROL = 0x00000007,
+ SBI_MPXY_ATTR_MSI_ADDR_LO = 0x00000008,
+ SBI_MPXY_ATTR_MSI_ADDR_HI = 0x00000009,
+ SBI_MPXY_ATTR_MSI_DATA = 0x0000000A,
+ SBI_MPXY_ATTR_EVENTS_STATE_CONTROL = 0x0000000B,
+ SBI_MPXY_ATTR_STD_ATTR_MAX_IDX,
+ /*
+ * Message protocol specific attributes, managed by
+ * the message protocol specification.
+ */
+ SBI_MPXY_ATTR_MSGPROTO_ATTR_START = 0x80000000,
+ SBI_MPXY_ATTR_MSGPROTO_ATTR_END = 0xffffffff
+};
+
+/* Possible values of MSG_PROT_ID attribute */
+enum sbi_mpxy_msgproto_id {
+ SBI_MPXY_MSGPROTO_RPMI_ID = 0x0,
+};
+
+/** RPMI message protocol specific MPXY attributes */
+enum sbi_mpxy_rpmi_attribute_id {
+ SBI_MPXY_RPMI_ATTR_SERVICEGROUP_ID = SBI_MPXY_ATTR_MSGPROTO_ATTR_START,
+ SBI_MPXY_RPMI_ATTR_SERVICEGROUP_VERSION,
+ SBI_MPXY_RPMI_ATTR_MAX_ID,
+};
+
+/* Encoding of MSG_PROT_VER attribute */
+#define SBI_MPXY_MSG_PROT_VER_MAJOR(__ver) (((__ver) >> 16) & 0xffff)
+#define SBI_MPXY_MSG_PROT_VER_MINOR(__ver) ((__ver) & 0xffff)
+#define SBI_MPXY_MSG_PROT_MKVER(__maj, __min) (((__maj) << 16) | (__min))
+
+/* Capabilities available through CHANNEL_CAPABILITY attribute */
+#define SBI_MPXY_CHAN_CAP_MSI BIT(0)
+#define SBI_MPXY_CHAN_CAP_SSE BIT(1)
+#define SBI_MPXY_CHAN_CAP_EVENTS_STATE BIT(2)
+#define SBI_MPXY_CHAN_CAP_SEND_WITH_RESP BIT(3)
+#define SBI_MPXY_CHAN_CAP_SEND_WITHOUT_RESP BIT(4)
+#define SBI_MPXY_CHAN_CAP_GET_NOTIFICATIONS BIT(5)
+
/* SBI spec version fields */
#define SBI_SPEC_VERSION_DEFAULT 0x1
#define SBI_SPEC_VERSION_MAJOR_SHIFT 24
--
2.43.0