On 27/08/2021 12.17, Pierre Morel wrote:
Registering IRQ for the CSS level.
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
lib/s390x/css.h | 21 +++++++++++++++++++++
lib/s390x/css_lib.c | 27 +++++++++++++++++++++++++--
2 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index 2005f4d7..0422f2e7 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -402,4 +402,25 @@ struct measurement_block_format1 {
uint32_t irq_prio_delay_time;
};
+#include <asm/arch_def.h>
+static inline void disable_io_irq(void)
+{
+ uint64_t mask;
+
+ mask = extract_psw_mask();
+ mask &= ~PSW_MASK_IO;
+ load_psw_mask(mask);
+}
+
+static inline void enable_io_irq(void)
+{
+ uint64_t mask;
+
+ mask = extract_psw_mask();
+ mask |= PSW_MASK_IO;
+ load_psw_mask(mask);
+}
+
+int register_css_irq_func(void (*f)(void));
+int unregister_css_irq_func(void (*f)(void));
#endif
diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c
index 484f9c41..a89fc93c 100644
--- a/lib/s390x/css_lib.c
+++ b/lib/s390x/css_lib.c
@@ -350,8 +350,29 @@ bool css_disable_mb(int schid)
return retry_count > 0;
}
-static struct irb irb;
+static void (*css_irq_func)(void);
+
+int register_css_irq_func(void (*f)(void))
+{
+ if (css_irq_func)
+ return -1;
+ css_irq_func = f;
+ assert(register_io_int_func(css_irq_io) == 0);
It's unlikely that we ever disable assert() in the k-u-t, but anyway, I'd
prefer not to put function calls within assert() statements, just in case.
So could you please replace this with:
rc = register_io_int_func(css_irq_io);
assert(rc == 0);
?
+ enable_io_isc(0x80 >> IO_SCH_ISC);
+ return 0;
+}
+int unregister_css_irq_func(void (*f)(void))
+{
+ if (css_irq_func != f)
+ return -1;
+ enable_io_isc(0);
+ unregister_io_int_func(css_irq_io);
+ css_irq_func = NULL;
+ return 0;
+}
+
+static struct irb irb;
void css_irq_io(void)
{
int ret = 0;
@@ -386,7 +407,9 @@ void css_irq_io(void)
report(0, "tsch reporting sch %08x as not operational", sid);
break;
case 0:
- /* Stay humble on success */
+ /* Call upper level IRQ routine */
+ if (css_irq_func)
+ css_irq_func();
break;
}
pop:
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
