powerpc/64s: Add SCV FSCR bit for ISA v3.0

BugLink: http://bugs.launchpad.net/bugs/1691973
Add the bit definition and use it in facility_unavailable_exception() so we can
intelligently report the cause if we take a fault for SCV. This doesn't actually
enable SCV.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Drop whitespace changes to the existing entries, flush out change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
(cherry picked from commit 9b7ff0c6586bc0541ebcd1ff6773b11a49f1a058)
Signed-off-by: Gustavo Walbon <gwalbon@linux.vnet.ibm.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index cb02d32db14789acbb682ef7045678f4313a1918..463dbf53649dd1e52b9c8b7b884e4b6a2984a54f 100644 (file)
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -310,6 +310,7 @@
 #define SPRN_PMCR      0x374   /* Power Management Control Register */
 
 /* HFSCR and FSCR bit numbers are the same */
+#define FSCR_SCV_LG    12      /* Enable System Call Vectored */
 #define FSCR_MSGP_LG   10      /* Enable MSGP */
 #define FSCR_TAR_LG    8       /* Enable Target Address Register */
 #define FSCR_EBB_LG    7       /* Enable Event Based Branching */
@@ -320,6 +321,7 @@
 #define FSCR_VECVSX_LG 1       /* Enable VMX/VSX  */
 #define FSCR_FP_LG     0       /* Enable Floating Point */
 #define SPRN_FSCR      0x099   /* Facility Status & Control Register */
+#define   FSCR_SCV     __MASK(FSCR_SCV_LG)
 #define   FSCR_TAR     __MASK(FSCR_TAR_LG)
 #define   FSCR_EBB     __MASK(FSCR_EBB_LG)
 #define   FSCR_DSCR    __MASK(FSCR_DSCR_LG)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 9f025ea2216d1777cb94d47615731742c2cc2c15..e3655d7e66e28ce162fcc0e266189f86cf79a912 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1440,6 +1440,7 @@ void facility_unavailable_exception(struct pt_regs *regs)
                [FSCR_EBB_LG] = "EBB",
                [FSCR_TAR_LG] = "TAR",
                [FSCR_MSGP_LG] = "MSGP",
+               [FSCR_SCV_LG] = "SCV",
        };
        char *facility = "unknown";
        u64 value;