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[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.
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Check the cpu type in the OBP device tree before committing to
using the optimized Niagara memcpy and memset implementation.

If we don't recognize the cpu type, use a completely generic
version.

Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller committed Aug 9, 2007
1 parent 68c9f9f commit 6c70b6f
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Showing 13 changed files with 604 additions and 37 deletions.
42 changes: 15 additions & 27 deletions arch/sparc64/kernel/cpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
#include <asm/fpumacro.h>
#include <asm/cpudata.h>
#include <asm/spitfire.h>
#include <asm/prom.h>
#include <asm/oplib.h>

DEFINE_PER_CPU(cpuinfo_sparc, __cpu_data) = { 0 };

Expand Down Expand Up @@ -69,36 +69,24 @@ unsigned int fsr_storage;

static void __init sun4v_cpu_probe(void)
{
struct device_node *dp;
const char *compat;
int len;

dp = of_find_node_by_name(NULL, "cpu");
if (!dp)
goto no_compat;

compat = of_get_property(dp, "compatible", &len);
if (!compat)
goto no_compat;

if (of_find_in_proplist(compat, "SUNW,UltraSPARC-T1", len)) {
switch (sun4v_chip_type) {
case SUN4V_CHIP_NIAGARA1:
sparc_cpu_type = "UltraSparc T1 (Niagara)";
sparc_fpu_type = "UltraSparc T1 integrated FPU";
} else if (of_find_in_proplist(compat, "SUNW,UltraSPARC-T2", len)) {
break;

case SUN4V_CHIP_NIAGARA2:
sparc_cpu_type = "UltraSparc T2 (Niagara2)";
sparc_fpu_type = "UltraSparc T2 integrated FPU";
} else
goto unknown;

return;

no_compat:
compat = "no property";

unknown:
printk(KERN_WARNING "CPU: Unknown sun4v cpu type [%s]\n", compat);
sparc_cpu_type = "Unknown SUN4V CPU";
sparc_fpu_type = "Unknown SUN4V FPU";
break;

default:
printk(KERN_WARNING "CPU: Unknown sun4v cpu type [%s]\n",
prom_cpu_compatible);
sparc_cpu_type = "Unknown SUN4V CPU";
sparc_fpu_type = "Unknown SUN4V FPU";
break;
}
}

void __init cpu_probe(void)
Expand Down
111 changes: 106 additions & 5 deletions arch/sparc64/kernel/head.S
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Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,8 @@ sparc64_boot:
.globl prom_map_name, prom_unmap_name, prom_mmu_ihandle_cache
.globl prom_boot_mapped_pc, prom_boot_mapping_mode
.globl prom_boot_mapping_phys_high, prom_boot_mapping_phys_low
.globl is_sun4v
.globl prom_compatible_name, prom_cpu_path, prom_cpu_compatible
.globl is_sun4v, sun4v_chip_type
prom_peer_name:
.asciz "peer"
prom_compatible_name:
Expand All @@ -106,6 +107,8 @@ prom_finddev_name:
.asciz "finddevice"
prom_chosen_path:
.asciz "/chosen"
prom_cpu_path:
.asciz "/cpu"
prom_getprop_name:
.asciz "getprop"
prom_mmu_name:
Expand All @@ -120,9 +123,13 @@ prom_unmap_name:
.asciz "unmap"
prom_sun4v_name:
.asciz "sun4v"
prom_niagara_prefix:
.asciz "SUNW,UltraSPARC-T"
.align 4
prom_root_compatible:
.skip 64
prom_cpu_compatible:
.skip 64
prom_root_node:
.word 0
prom_mmu_ihandle_cache:
Expand All @@ -138,6 +145,8 @@ prom_boot_mapping_phys_low:
.xword 0
is_sun4v:
.word 0
sun4v_chip_type:
.word SUN4V_CHIP_INVALID
1:
rd %pc, %l0

Expand Down Expand Up @@ -296,21 +305,94 @@ is_sun4v:
sethi %hi(prom_sun4v_name), %g7
or %g7, %lo(prom_sun4v_name), %g7
mov 5, %g3
1: ldub [%g7], %g2
90: ldub [%g7], %g2
ldub [%g1], %g4
cmp %g2, %g4
bne,pn %icc, 2f
bne,pn %icc, 80f
add %g7, 1, %g7
subcc %g3, 1, %g3
bne,pt %xcc, 1b
bne,pt %xcc, 90b
add %g1, 1, %g1

sethi %hi(is_sun4v), %g1
or %g1, %lo(is_sun4v), %g1
mov 1, %g7
stw %g7, [%g1]

2:
/* cpu_node = prom_finddevice("/cpu") */
mov (1b - prom_finddev_name), %l1
mov (1b - prom_cpu_path), %l2
sub %l0, %l1, %l1
sub %l0, %l2, %l2
sub %sp, (192 + 128), %sp

stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "finddevice"
mov 1, %l3
stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 1
stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
stx %l2, [%sp + 2047 + 128 + 0x18] ! arg1, "/cpu"
stx %g0, [%sp + 2047 + 128 + 0x20] ! ret1
call %l7
add %sp, (2047 + 128), %o0 ! argument array

ldx [%sp + 2047 + 128 + 0x20], %l4 ! cpu device node

mov (1b - prom_getprop_name), %l1
mov (1b - prom_compatible_name), %l2
mov (1b - prom_cpu_compatible), %l5
sub %l0, %l1, %l1
sub %l0, %l2, %l2
sub %l0, %l5, %l5

/* prom_getproperty(cpu_node, "compatible",
* &prom_cpu_compatible, 64)
*/
stx %l1, [%sp + 2047 + 128 + 0x00] ! service, "getprop"
mov 4, %l3
stx %l3, [%sp + 2047 + 128 + 0x08] ! num_args, 4
mov 1, %l3
stx %l3, [%sp + 2047 + 128 + 0x10] ! num_rets, 1
stx %l4, [%sp + 2047 + 128 + 0x18] ! arg1, cpu_node
stx %l2, [%sp + 2047 + 128 + 0x20] ! arg2, "compatible"
stx %l5, [%sp + 2047 + 128 + 0x28] ! arg3, &prom_cpu_compatible
mov 64, %l3
stx %l3, [%sp + 2047 + 128 + 0x30] ! arg4, size
stx %g0, [%sp + 2047 + 128 + 0x38] ! ret1
call %l7
add %sp, (2047 + 128), %o0 ! argument array

add %sp, (192 + 128), %sp

sethi %hi(prom_cpu_compatible), %g1
or %g1, %lo(prom_cpu_compatible), %g1
sethi %hi(prom_niagara_prefix), %g7
or %g7, %lo(prom_niagara_prefix), %g7
mov 17, %g3
90: ldub [%g7], %g2
ldub [%g1], %g4
cmp %g2, %g4
bne,pn %icc, 4f
add %g7, 1, %g7
subcc %g3, 1, %g3
bne,pt %xcc, 90b
add %g1, 1, %g1

sethi %hi(prom_cpu_compatible), %g1
or %g1, %lo(prom_cpu_compatible), %g1
ldub [%g1 + 17], %g2
cmp %g2, '1'
be,pt %xcc, 5f
mov SUN4V_CHIP_NIAGARA1, %g4
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
or %g2, %lo(sun4v_chip_type), %g2
stw %g4, [%g2]

80:
BRANCH_IF_SUN4V(g1, jump_to_sun4u_init)
BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
Expand Down Expand Up @@ -414,13 +496,32 @@ niagara_tlb_fixup:
stw %g2, [%g1 + %lo(tlb_type)]

/* Patch copy/clear ops. */
sethi %hi(sun4v_chip_type), %g1
lduw [%g1 + %lo(sun4v_chip_type)], %g1
cmp %g1, SUN4V_CHIP_NIAGARA1
be,pt %xcc, niagara_patch
cmp %g1, SUN4V_CHIP_NIAGARA2
be,pt %xcc, niagara_patch
nop

call generic_patch_copyops
nop
call generic_patch_bzero
nop
call generic_patch_pageops
nop

ba,a,pt %xcc, 80f

niagara_patch:
call niagara_patch_copyops
nop
call niagara_patch_bzero
nop
call niagara_patch_pageops
nop

80:
/* Patch TLB/cache ops. */
call hypervisor_patch_cachetlbops
nop
Expand Down
1 change: 1 addition & 0 deletions arch/sparc64/kernel/sparc64_ksyms.c
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,7 @@ EXPORT_SYMBOL(change_bit);
EXPORT_SYMBOL(__flushw_user);

EXPORT_SYMBOL(tlb_type);
EXPORT_SYMBOL(sun4v_chip_type);
EXPORT_SYMBOL(get_fb_unmapped_area);
EXPORT_SYMBOL(flush_icache_range);

Expand Down
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