powerpc/pseries: Add H_GET_CPU_CHARACTERISTICS flags & wrapper
authorMichael Neuling <mikey@neuling.org>
Mon, 8 Jan 2018 16:52:05 +0000 (03:52 +1100)
committerMichael Ellerman <mpe@ellerman.id.au>
Tue, 9 Jan 2018 14:46:34 +0000 (01:46 +1100)
A new hypervisor call has been defined to communicate various
characteristics of the CPU to guests. Add definitions for the hcall
number, flags and a wrapper function.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/include/asm/hvcall.h
arch/powerpc/include/asm/plpar_wrappers.h

index a409177..f046161 100644 (file)
 #define H_GET_HCA_INFO          0x1B8
 #define H_GET_PERF_COUNT        0x1BC
 #define H_MANAGE_TRACE          0x1C0
+#define H_GET_CPU_CHARACTERISTICS 0x1C8
 #define H_FREE_LOGICAL_LAN_BUFFER 0x1D4
 #define H_QUERY_INT_STATE       0x1E4
 #define H_POLL_PENDING         0x1D8
 #define H_SIGNAL_SYS_RESET_ALL_OTHERS          -2
 /* >= 0 values are CPU number */
 
+/* H_GET_CPU_CHARACTERISTICS return values */
+#define H_CPU_CHAR_SPEC_BAR_ORI31      (1ull << 63) // IBM bit 0
+#define H_CPU_CHAR_BCCTRL_SERIALISED   (1ull << 62) // IBM bit 1
+#define H_CPU_CHAR_L1D_FLUSH_ORI30     (1ull << 61) // IBM bit 2
+#define H_CPU_CHAR_L1D_FLUSH_TRIG2     (1ull << 60) // IBM bit 3
+#define H_CPU_CHAR_L1D_THREAD_PRIV     (1ull << 59) // IBM bit 4
+
+#define H_CPU_BEHAV_FAVOUR_SECURITY    (1ull << 63) // IBM bit 0
+#define H_CPU_BEHAV_L1D_FLUSH_PR       (1ull << 62) // IBM bit 1
+#define H_CPU_BEHAV_BNDS_CHK_SPEC_BAR  (1ull << 61) // IBM bit 2
+
 /* Flag values used in H_REGISTER_PROC_TBL hcall */
 #define PROC_TABLE_OP_MASK     0x18
 #define PROC_TABLE_DEREG       0x10
@@ -436,6 +448,11 @@ static inline unsigned int get_longbusy_msecs(int longbusy_rc)
        }
 }
 
+struct h_cpu_char_result {
+       u64 character;
+       u64 behaviour;
+};
+
 #endif /* __ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_HVCALL_H */
index 7f01b22..55eddf5 100644 (file)
@@ -326,4 +326,18 @@ static inline long plapr_signal_sys_reset(long cpu)
        return plpar_hcall_norets(H_SIGNAL_SYS_RESET, cpu);
 }
 
+static inline long plpar_get_cpu_characteristics(struct h_cpu_char_result *p)
+{
+       unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+       long rc;
+
+       rc = plpar_hcall(H_GET_CPU_CHARACTERISTICS, retbuf);
+       if (rc == H_SUCCESS) {
+               p->character = retbuf[0];
+               p->behaviour = retbuf[1];
+       }
+
+       return rc;
+}
+
 #endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */