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s390/ctlreg: add system_ctl_load()

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Add system_ctl_load() which can be used to load a value to a control
register system wide.

Refactor system_ctl_set_clear_bit() so it can handle all different
request types, and also rename it to system_ctlreg_modify()

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2023-09-11 21:40:08 +02:00 • committed by Vasily Gorbik
parent 103dde702d
commit 305a5551af
2 changed files with 53 additions and 21 deletions
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17
arch/s390/include/asm/ctlreg.h
View file

@ -114,17 +114,28 @@ struct lowcore;
void system_ctlreg_lock(void);
void system_ctlreg_unlock(void);
void system_ctl_set_clear_bit(unsigned int cr, unsigned int bit, bool set);
void system_ctlreg_init_save_area(struct lowcore *lc);
void system_ctlreg_modify(unsigned int cr, unsigned long data, int request);
enum {
CTLREG_SET_BIT,
CTLREG_CLEAR_BIT,
CTLREG_LOAD,
};
static inline void system_ctl_set_bit(unsigned int cr, unsigned int bit)
{
system_ctl_set_clear_bit(cr, bit, true);
system_ctlreg_modify(cr, bit, CTLREG_SET_BIT);
}
static inline void system_ctl_clear_bit(unsigned int cr, unsigned int bit)
{
system_ctl_set_clear_bit(cr, bit, false);
system_ctlreg_modify(cr, bit, CTLREG_CLEAR_BIT);
}
static inline void system_ctl_load(unsigned int cr, struct ctlreg *reg)
{
system_ctlreg_modify(cr, reg->val, CTLREG_LOAD);
}
union ctlreg0 {

57
arch/s390/kernel/ctlreg.c
View file

@ -44,24 +44,30 @@ void __init system_ctlreg_init_save_area(struct lowcore *lc)
system_ctlreg_area_init = true;
}
struct ctl_bit_parms {
unsigned long orval;
struct ctlreg_parms {
unsigned long andval;
unsigned long orval;
unsigned long val;
int request;
int cr;
};
static void ctl_bit_callback(void *info)
static void ctlreg_callback(void *info)
{
struct ctl_bit_parms *pp = info;
struct ctlreg_parms *pp = info;
struct ctlreg regs[16];
__local_ctl_store(0, 15, regs);
regs[pp->cr].val &= pp->andval;
regs[pp->cr].val |= pp->orval;
if (pp->request == CTLREG_LOAD) {
regs[pp->cr].val = pp->val;
} else {
regs[pp->cr].val &= pp->andval;
regs[pp->cr].val |= pp->orval;
}
__local_ctl_load(0, 15, regs);
}
static void system_ctl_bit_update(void *info)
static void system_ctlreg_update(void *info)
{
unsigned long flags;
@ -71,30 +77,45 @@ static void system_ctl_bit_update(void *info)
* since not everything might be setup.
*/
local_irq_save(flags);
ctl_bit_callback(info);
ctlreg_callback(info);
local_irq_restore(flags);
} else {
on_each_cpu(ctl_bit_callback, info, 1);
on_each_cpu(ctlreg_callback, info, 1);
}
}
void system_ctl_set_clear_bit(unsigned int cr, unsigned int bit, bool set)
void system_ctlreg_modify(unsigned int cr, unsigned long data, int request)
{
struct ctl_bit_parms pp = { .cr = cr, };
struct ctlreg_parms pp = { .cr = cr, .request = request, };
struct lowcore *abs_lc;
pp.orval = set ? 1UL << bit : 0;
pp.andval = set ? -1UL : ~(1UL << bit);
switch (request) {
case CTLREG_SET_BIT:
pp.orval = 1UL << data;
pp.andval = -1UL;
break;
case CTLREG_CLEAR_BIT:
pp.orval = 0;
pp.andval = ~(1UL << data);
break;
case CTLREG_LOAD:
pp.val = data;
break;
}
if (system_ctlreg_area_init) {
system_ctlreg_lock();
abs_lc = get_abs_lowcore();
abs_lc->cregs_save_area[cr].val &= pp.andval;
abs_lc->cregs_save_area[cr].val |= pp.orval;
if (request == CTLREG_LOAD) {
abs_lc->cregs_save_area[cr].val = pp.val;
} else {
abs_lc->cregs_save_area[cr].val &= pp.andval;
abs_lc->cregs_save_area[cr].val |= pp.orval;
}
put_abs_lowcore(abs_lc);
system_ctl_bit_update(&pp);
system_ctlreg_update(&pp);
system_ctlreg_unlock();
} else {
system_ctl_bit_update(&pp);
system_ctlreg_update(&pp);
}
}
EXPORT_SYMBOL(system_ctl_set_clear_bit);
EXPORT_SYMBOL(system_ctlreg_modify);