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Commit 14375bc4 authored by Martin Schwidefsky's avatar Martin Schwidefsky Committed by Martin Schwidefsky
Browse files

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent eca577ef

arch/s390/crypto/crypt_s390.h

+1 −1
Original line number Diff line number Diff line
@@ -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) {

arch/s390/include/asm/lowcore.h

+8 −3
Original line number Diff line number Diff line
@@ -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 */

arch/s390/include/asm/system.h

+12 −21
Original line number Diff line number Diff line
@@ -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;



	asm volatile(".insn s,0xb2b00000,%0" /* stfle */

		     : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");

	return __nr + 1;

}

	unsigned char *ptr;



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)

arch/s390/kernel/early.c

+29 −11
Original line number Diff line number Diff line
@@ -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();

arch/s390/kernel/setup.c

+7 −12
Original line number Diff line number Diff line
@@ -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))))

	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.