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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-10-25 16:10:51 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-10-25 16:10:21 +0200
commit14375bc4eb8dd0fb0e765390650564c35bb31068 (patch)
tree27200620658245c582ee9497fc969a082b304cab /arch/s390/kernel
parenteca577ef5989d25dedc6b0fae3c4622ceaee8005 (diff)
downloadlinux-linaro-android-14375bc4eb8dd0fb0e765390650564c35bb31068.tar.gz
[S390] cleanup facility list handling
Store the facility list once at system startup with stfl/stfle and reuse the result for all facility tests. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/early.c40
-rw-r--r--arch/s390/kernel/setup.c19
-rw-r--r--arch/s390/kernel/smp.c2
-rw-r--r--arch/s390/kernel/topology.c5
-rw-r--r--arch/s390/kernel/vdso.c6
5 files changed, 40 insertions, 32 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 0badc6344eb..d2455d44d99 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -256,13 +256,35 @@ static noinline __init void setup_lowcore_early(void)
s390_base_pgm_handler_fn = early_pgm_check_handler;
}
+static noinline __init void setup_facility_list(void)
+{
+ unsigned long nr;
+
+ S390_lowcore.stfl_fac_list = 0;
+ asm volatile(
+ " .insn s,0xb2b10000,0(0)\n" /* stfl */
+ "0:\n"
+ EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list));
+ memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
+ nr = 4; /* # bytes stored by stfl */
+ if (test_facility(7)) {
+ /* More facility bits available with stfle */
+ register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1;
+ asm volatile(".insn s,0xb2b00000,%0" /* stfle */
+ : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0)
+ : : "cc");
+ nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
+ }
+ memset((char *) S390_lowcore.stfle_fac_list + nr, 0,
+ MAX_FACILITY_BIT/8 - nr);
+}
+
static noinline __init void setup_hpage(void)
{
#ifndef CONFIG_DEBUG_PAGEALLOC
unsigned int facilities;
- facilities = stfl();
- if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
+ if (!test_facility(2) || !test_facility(8))
return;
S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
__ctl_set_bit(0, 23);
@@ -356,18 +378,13 @@ static __init void detect_diag44(void)
static __init void detect_machine_facilities(void)
{
#ifdef CONFIG_64BIT
- unsigned int facilities;
- unsigned long long facility_bits;
-
- facilities = stfl();
- if (facilities & (1 << 28))
+ if (test_facility(3))
S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
- if (facilities & (1 << 23))
+ if (test_facility(8))
S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
- if (facilities & (1 << 4))
+ if (test_facility(27))
S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
- if ((stfle(&facility_bits, 1) > 0) &&
- (facility_bits & (1ULL << (63 - 40))))
+ if (test_facility(40))
S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
#endif
}
@@ -448,6 +465,7 @@ void __init startup_init(void)
lockdep_off();
sort_main_extable();
setup_lowcore_early();
+ setup_facility_list();
detect_machine_type();
ipl_update_parameters();
setup_boot_command_line();
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 9071e984dcf..e3ceb911dc7 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -409,6 +409,9 @@ setup_lowcore(void)
lc->current_task = (unsigned long) init_thread_union.thread_info.task;
lc->thread_info = (unsigned long) &init_thread_union;
lc->machine_flags = S390_lowcore.machine_flags;
+ lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
+ memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
+ MAX_FACILITY_BIT/8);
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
lc->extended_save_area_addr = (__u32)
@@ -675,12 +678,9 @@ setup_memory(void)
static void __init setup_hwcaps(void)
{
static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
- unsigned long long facility_list_extended;
- unsigned int facility_list;
struct cpuid cpu_id;
int i;
- facility_list = stfl();
/*
* The store facility list bits numbers as found in the principles
* of operation are numbered with bit 1UL<<31 as number 0 to
@@ -700,11 +700,10 @@ static void __init setup_hwcaps(void)
* HWCAP_S390_ETF3EH bit 8 (22 && 30).
*/
for (i = 0; i < 6; i++)
- if (facility_list & (1UL << (31 - stfl_bits[i])))
+ if (test_facility(stfl_bits[i]))
elf_hwcap |= 1UL << i;
- if ((facility_list & (1UL << (31 - 22)))
- && (facility_list & (1UL << (31 - 30))))
+ if (test_facility(22) && test_facility(30))
elf_hwcap |= HWCAP_S390_ETF3EH;
/*
@@ -720,12 +719,8 @@ static void __init setup_hwcaps(void)
* translated to:
* HWCAP_S390_DFP bit 6 (42 && 44).
*/
- if ((elf_hwcap & (1UL << 2)) &&
- __stfle(&facility_list_extended, 1) > 0) {
- if ((facility_list_extended & (1ULL << (63 - 42)))
- && (facility_list_extended & (1ULL << (63 - 44))))
- elf_hwcap |= HWCAP_S390_DFP;
- }
+ if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
+ elf_hwcap |= HWCAP_S390_DFP;
/*
* Huge page support HWCAP_S390_HPAGE is bit 7.
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 354589d096b..94cf510b8fe 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -594,6 +594,8 @@ int __cpuinit __cpu_up(unsigned int cpu)
cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce;
cpu_lowcore->machine_flags = S390_lowcore.machine_flags;
cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
+ memcpy(cpu_lowcore->stfle_fac_list, S390_lowcore.stfle_fac_list,
+ MAX_FACILITY_BIT/8);
eieio();
while (sigp(cpu, sigp_restart) == sigp_busy)
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index eb0bc4752ae..91fb66baa50 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -351,13 +351,10 @@ static void alloc_masks(struct tl_info *info, struct mask_info *mask, int offset
void __init s390_init_cpu_topology(void)
{
- unsigned long long facility_bits;
struct tl_info *info;
int i;
- if (stfle(&facility_bits, 1) <= 0)
- return;
- if (!(facility_bits & (1ULL << 52)) || !(facility_bits & (1ULL << 61)))
+ if (!test_facility(2) || !test_facility(11))
return;
machine_has_topology = 1;
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 6b83870507d..e3150dd2fe7 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -84,11 +84,7 @@ struct vdso_data *vdso_data = &vdso_data_store.data;
*/
static void vdso_init_data(struct vdso_data *vd)
{
- unsigned int facility_list;
-
- facility_list = stfl();
- vd->ectg_available =
- user_mode != HOME_SPACE_MODE && (facility_list & 1);
+ vd->ectg_available = user_mode != HOME_SPACE_MODE && test_facility(31);
}
#ifdef CONFIG_64BIT