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[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>
hifive-unleashed-5.1
Martin Schwidefsky 2010-10-25 16:10:51 +02:00 committed by Martin Schwidefsky
parent eca577ef59
commit 14375bc4eb
12 changed files with 66 additions and 74 deletions
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2
arch/s390/crypto/crypt_s390.h
View File

@ -297,7 +297,7 @@ static inline int crypt_s390_func_available(int func)
int ret;
/* check if CPACF facility (bit 17) is available */
if (!(stfl() & 1ULL << (31 - 17)))
if (!test_facility(17))
return 0;
switch (func & CRYPT_S390_OP_MASK) {

11
arch/s390/include/asm/lowcore.h
View File

@ -150,9 +150,10 @@ struct _lowcore {
*/
__u32 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e04 */
__u8 pad_0x0e08[0x0f00-0x0e08]; /* 0x0e08 */
/* Align to the top 1k of prefix area */
__u8 pad_0x0e08[0x1000-0x0e08]; /* 0x0e08 */
/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
} __packed;
#else /* CONFIG_32BIT */
@ -285,7 +286,11 @@ struct _lowcore {
*/
__u64 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e08 */
__u8 pad_0x0e0c[0x11b8-0x0e0c]; /* 0x0e0c */
__u8 pad_0x0e0c[0x0f00-0x0e0c]; /* 0x0e0c */
/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
__u8 pad_0x1000[0x11b8-0x1000]; /* 0x1000 */
/* 64 bit extparam used for pfault/diag 250: defined by architecture */
__u64 ext_params2; /* 0x11B8 */

33
arch/s390/include/asm/system.h
View File

@ -420,30 +420,21 @@ extern void smp_ctl_clear_bit(int cr, int bit);
#endif /* CONFIG_SMP */
static inline unsigned int stfl(void)
{
asm volatile(
" .insn s,0xb2b10000,0(0)\n" /* stfl */
"0:\n"
EX_TABLE(0b,0b));
return S390_lowcore.stfl_fac_list;
}
#define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */
static inline int __stfle(unsigned long long *list, int doublewords)
/*
* The test_facility function uses the bit odering where the MSB is bit 0.
* That makes it easier to query facility bits with the bit number as
* documented in the Principles of Operation.
*/
static inline int test_facility(unsigned long nr)
{
typedef struct { unsigned long long _[doublewords]; } addrtype;
register unsigned long __nr asm("0") = doublewords - 1;
unsigned char *ptr;
asm volatile(".insn s,0xb2b00000,%0" /* stfle */
: "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
return __nr + 1;
}
static inline int stfle(unsigned long long *list, int doublewords)
{
if (!(stfl() & (1UL << 24)))
return -EOPNOTSUPP;
return __stfle(list, doublewords);
if (nr >= MAX_FACILITY_BIT)
return 0;
ptr = (unsigned char *) &S390_lowcore.stfle_fac_list + (nr >> 3);
return (*ptr & (0x80 >> (nr & 7))) != 0;
}
static inline unsigned short stap(void)

40
arch/s390/kernel/early.c
View File

@ -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();

19
arch/s390/kernel/setup.c
View File

@ -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.

2
arch/s390/kernel/smp.c
View File

@ -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)

5
arch/s390/kernel/topology.c
View File

@ -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;

6
arch/s390/kernel/vdso.c
View File

@ -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

2
arch/s390/kvm/kvm-s390.c
View File

@ -740,7 +740,7 @@ static int __init kvm_s390_init(void)
kvm_exit();
return -ENOMEM;
}
stfle(facilities, 1);
memcpy(facilities, S390_lowcore.stfle_fac_list, 16);
facilities[0] &= 0xff00fff3f47c0000ULL;
return 0;
}

4
arch/s390/kvm/priv.c
View File

@ -154,12 +154,12 @@ static int handle_chsc(struct kvm_vcpu *vcpu)
static int handle_stfl(struct kvm_vcpu *vcpu)
{
unsigned int facility_list = stfl();
unsigned int facility_list;
int rc;
vcpu->stat.instruction_stfl++;
/* only pass the facility bits, which we can handle */
facility_list &= 0xff00fff3;
facility_list = S390_lowcore.stfl_fac_list & 0xff00fff3;
rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
&facility_list, sizeof(facility_list));

7
arch/s390/mm/fault.c
View File

@ -56,12 +56,7 @@ static unsigned long store_indication;
void fault_init(void)
{
unsigned long long facility_list[2];
if (stfle(facility_list, 2) < 2)
return;
if ((facility_list[0] & (1ULL << 61)) &&
(facility_list[1] & (1ULL << 52)))
if (test_facility(2) && test_facility(75))
store_indication = 0xc00;
}

9
drivers/s390/crypto/ap_bus.c
View File

@ -154,14 +154,7 @@ static inline int ap_instructions_available(void)
*/
static int ap_interrupts_available(void)
{
unsigned long long facility_bits[2];
if (stfle(facility_bits, 2) <= 1)
return 0;
if (!(facility_bits[0] & (1ULL << 61)) ||
!(facility_bits[1] & (1ULL << 62)))
return 0;
return 1;
return test_facility(1) && test_facility(2);
}
/**