sparc: Detect and handle UltraSPARC-T3 cpu types.

The cpu compatible string we look for is "SPARC-T3".

As far as memset/memcpy optimizations go, we treat this chip the same
as Niagara-T2/T2+.  Use cache initializing stores for memset, and use
perfetch, FPU block loads, cache initializing stores, and block stores
for copies.

We use the Niagara-T2 perf support, since T3 is a close relative in
this regard.  Later we'll add support for the new events T3 can
report, plus enable T3's new "sample" mode.

For now I haven't added any new ELF hwcap flags.  We probably need
to add a couple, for example:

T2 and T3 both support the population count instruction in hardware.

T3 supports VIS3 instructions, including support (finally) for
partitioned shift.  One can also now move directly between float
and integer registers.

T3 supports instructions meant to help with Galois Field and other HPC
calculations, such as XOR multiply.  Also there are "OP and negate"
instructions, for example "fnmul" which is multiply-and-negate.

T3 recognizes the transactional memory opcodes, however since
transactional memory isn't supported: 1) 'commit' behaves as a NOP and
2) 'chkpt' always branches 3) 'rdcps' returns all zeros and 4) 'wrcps'
behaves as a NOP.

So we'll need about 3 new elf capability flags in the end to represent
all of these things.

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 50 insertions, 4 deletions

diff --git a/arch/sparc/include/asm/elf_64.h b/arch/sparc/include/asm/elf_64.h
index cfa9cd2e5519..64f7a00b3747 100644
--- a/arch/sparc/include/asm/elf_64.h
+++ b/arch/sparc/include/asm/elf_64.h
@@ -177,9 +177,11 @@ static inline unsigned int sparc64_elf_hwcap(void)
                 cap |= HWCAP_SPARC_ULTRA3;
         else if (tlb_type == hypervisor) {
                 if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 ||
-                    sun4v_chip_type == SUN4V_CHIP_NIAGARA2)
+                    sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
+                    sun4v_chip_type == SUN4V_CHIP_NIAGARA3)
                         cap |= HWCAP_SPARC_BLKINIT;
-                if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2)
+                if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
+                    sun4v_chip_type == SUN4V_CHIP_NIAGARA3)
                         cap |= HWCAP_SPARC_N2;
         }
 
diff --git a/arch/sparc/include/asm/xor_64.h b/arch/sparc/include/asm/xor_64.h
index bee4bf4be3af..9ed6ff679ab7 100644
--- a/arch/sparc/include/asm/xor_64.h
+++ b/arch/sparc/include/asm/xor_64.h
@@ -65,6 +65,7 @@ static struct xor_block_template xor_block_niagara = {
 #define XOR_SELECT_TEMPLATE(FASTEST) \
         ((tlb_type == hypervisor && \
           (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 || \
-           sun4v_chip_type == SUN4V_CHIP_NIAGARA2)) ? \
+           sun4v_chip_type == SUN4V_CHIP_NIAGARA2 || \
+           sun4v_chip_type == SUN4V_CHIP_NIAGARA3)) ? \
          &xor_block_niagara : \
          &xor_block_VIS)
diff --git a/arch/sparc/kernel/cpu.c b/arch/sparc/kernel/cpu.c
index 70f035c86c03..17cf290dc2bc 100644
--- a/arch/sparc/kernel/cpu.c
+++ b/arch/sparc/kernel/cpu.c
@@ -474,6 +474,12 @@ static void __init sun4v_cpu_probe(void)
                 sparc_pmu_type = "niagara2";
                 break;
 
+        case SUN4V_CHIP_NIAGARA3:
+                sparc_cpu_type = "UltraSparc T3 (Niagara3)";
+                sparc_fpu_type = "UltraSparc T3 integrated FPU";
+                sparc_pmu_type = "niagara3";
+                break;
+
         default:
                 printk(KERN_WARNING "CPU: Unknown sun4v cpu type [%s]\n",
                        prom_cpu_compatible);
diff --git a/arch/sparc/kernel/cpumap.c b/arch/sparc/kernel/cpumap.c
index d91fd782743a..4197e8d62d4c 100644
--- a/arch/sparc/kernel/cpumap.c
+++ b/arch/sparc/kernel/cpumap.c
@@ -324,6 +324,7 @@ static int iterate_cpu(struct cpuinfo_tree *t, unsigned int root_index)
         switch (sun4v_chip_type) {
         case SUN4V_CHIP_NIAGARA1:
         case SUN4V_CHIP_NIAGARA2:
+        case SUN4V_CHIP_NIAGARA3:
                 rover_inc_table = niagara_iterate_method;
                 break;
         default:
diff --git a/arch/sparc/kernel/head_64.S b/arch/sparc/kernel/head_64.S
index aa594c792d19..c752603a7c0d 100644
--- a/arch/sparc/kernel/head_64.S
+++ b/arch/sparc/kernel/head_64.S
@@ -132,6 +132,8 @@ prom_sun4v_name:
         .asciz  "sun4v"
 prom_niagara_prefix:
         .asciz  "SUNW,UltraSPARC-T"
+prom_sparc_prefix:
+        .asciz  "SPARC-T"
         .align  4
 prom_root_compatible:
         .skip   64
@@ -382,6 +384,22 @@ sun4v_chip_type:
 90:     ldub    [%g7], %g2
         ldub    [%g1], %g4
         cmp     %g2, %g4
+        bne,pn  %icc, 89f
+         add    %g7, 1, %g7
+        subcc   %g3, 1, %g3
+        bne,pt  %xcc, 90b
+         add    %g1, 1, %g1
+        ba,pt   %xcc, 91f
+         nop
+
+89:     sethi   %hi(prom_cpu_compatible), %g1
+        or      %g1, %lo(prom_cpu_compatible), %g1
+        sethi   %hi(prom_sparc_prefix), %g7
+        or      %g7, %lo(prom_sparc_prefix), %g7
+        mov     7, %g3
+90:     ldub    [%g7], %g2
+        ldub    [%g1], %g4
+        cmp     %g2, %g4
         bne,pn  %icc, 4f
          add    %g7, 1, %g7
         subcc   %g3, 1, %g3
@@ -390,6 +408,15 @@ sun4v_chip_type:
 
         sethi   %hi(prom_cpu_compatible), %g1
         or      %g1, %lo(prom_cpu_compatible), %g1
+        ldub    [%g1 + 7], %g2
+        cmp     %g2, '3'
+        be,pt   %xcc, 5f
+         mov    SUN4V_CHIP_NIAGARA3, %g4
+        ba,pt   %xcc, 4f
+         nop
+
+91:     sethi   %hi(prom_cpu_compatible), %g1
+        or      %g1, %lo(prom_cpu_compatible), %g1
         ldub    [%g1 + 17], %g2
         cmp     %g2, '1'
         be,pt   %xcc, 5f
@@ -397,6 +424,7 @@ sun4v_chip_type:
         cmp     %g2, '2'
         be,pt   %xcc, 5f
          mov    SUN4V_CHIP_NIAGARA2, %g4
+        
 4:
         mov     SUN4V_CHIP_UNKNOWN, %g4
 5:      sethi   %hi(sun4v_chip_type), %g2
@@ -514,6 +542,9 @@ niagara_tlb_fixup:
          cmp    %g1, SUN4V_CHIP_NIAGARA2
         be,pt   %xcc, niagara2_patch
          nop
+        cmp     %g1, SUN4V_CHIP_NIAGARA3
+        be,pt   %xcc, niagara2_patch
+         nop
 
         call    generic_patch_copyops
          nop
diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c
index 878c6824c732..343b0f9e2e7b 100644
--- a/arch/sparc/kernel/pcr.c
+++ b/arch/sparc/kernel/pcr.c
@@ -109,6 +109,10 @@ static int __init register_perf_hsvc(void)
                         perf_hsvc_group = HV_GRP_N2_CPU;
                         break;
 
+                case SUN4V_CHIP_NIAGARA3:
+                        perf_hsvc_group = HV_GRP_KT_CPU;
+                        break;
+
                 default:
                         return -ENODEV;
                 }
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 171e8d84dc3f..614da624330c 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1343,7 +1343,8 @@ static bool __init supported_pmu(void)
                 sparc_pmu = &niagara1_pmu;
                 return true;
         }
-        if (!strcmp(sparc_pmu_type, "niagara2")) {
+        if (!strcmp(sparc_pmu_type, "niagara2") ||
+            !strcmp(sparc_pmu_type, "niagara3")) {
                 sparc_pmu = &niagara2_pmu;
                 return true;
         }