RISC-V: Add SBI STA extension definitions

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

Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 0892f4421bc4a5d0046750930b5637b355c15c26..b6f898c56940a2d3626d90436185279d01f288b8 100644 (file)
--- 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