[PATCH v1 02/14] RISC-V: Add SBI STA extension definitions

Andrew Jones
2023-12-05T18:11:40Z

The SBI STA extension enables steal-time accounting. Add the
definitions it specifies.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
arch/riscv/include/asm/sbi.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 9eef25308d53..d88d4e8f517e 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -31,6 +31,7 @@ enum sbi_ext_id {
SBI_EXT_SRST = 0x53525354,
SBI_EXT_PMU = 0x504D55,
SBI_EXT_DBCN = 0x4442434E,
+ SBI_EXT_STA = 0x535441,

/* Experimentals extensions must lie within this range */
SBI_EXT_EXPERIMENTAL_START = 0x08000000,
@@ -243,6 +244,22 @@ enum sbi_ext_dbcn_fid {
SBI_EXT_DBCN_CONSOLE_WRITE_BYTE = 2,
};

+/* SBI STA (steal-time accounting) extension */
+enum sbi_ext_sta_fid {
+ SBI_EXT_STA_STEAL_TIME_SET_SHMEM = 0,
+};
+
+struct sbi_sta_struct {
+ __le32 sequence;
+ __le32 flags;
+ __le64 steal;
+ u8 preempted;
+ u8 pad[47];
+} __packed;
+
+#define SBI_STA_SHMEM_DISABLE -1
+
+/* SBI spec version fields */
#define SBI_SPEC_VERSION_DEFAULT 0x1
#define SBI_SPEC_VERSION_MAJOR_SHIFT 24
#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f