We implement the call of the Set CHannel Monitor instruction,
starting the monitoring of the all Channel Sub System, and
initializing channel subsystem monitoring.
Initial tests report the presence of the extended measurement block
feature, and verify the error reporting of the hypervisor for SCHM.
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
---
lib/s390x/css.h | 12 ++++++++++++
s390x/css.c | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index 1cb3de2..b8ac363 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -310,6 +310,7 @@ struct chsc_scsc {
uint32_t res_04[2];
struct chsc_header res;
uint32_t res_fmt;
+#define CSSC_EXTENDED_MEASUREMENT_BLOCK 48
uint64_t general_char[255];
uint64_t chsc_char[254];
};
@@ -360,6 +361,17 @@ bool chsc(void *p, uint16_t code, uint16_t len);
#define css_general_feature(bit) test_bit_inv(bit, chsc_scsc->general_char)
#define css_chsc_feature(bit) test_bit_inv(bit, chsc_scsc->chsc_char)
+#define SCHM_DCTM 1 /* activate Device Connection TiMe */
+#define SCHM_MBU 2 /* activate Measurement Block Update */
+
+static inline void schm(void *mbo, unsigned int flags)
+{
+ register void *__gpr2 asm("2") = mbo;
+ register long __gpr1 asm("1") = flags;
+
+ asm("schm" : : "d" (__gpr2), "d" (__gpr1));
+}
+
bool css_enable_mb(int sid, uint64_t mb, uint16_t mbi, uint16_t flg, bool fmt1);
bool css_disable_mb(int schid);
diff --git a/s390x/css.c b/s390x/css.c
index c9e4903..e8f96f3 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -150,6 +150,40 @@ static void css_init(void)
report(1, "CSS initialized");
}
+static void test_schm(void)
+{
+ if (css_general_feature(CSSC_EXTENDED_MEASUREMENT_BLOCK))
+ report_info("Extended measurement block available");
+
+ /* bits 59-63 of MB address must be 0 if MBU is defined */
+ report_prefix_push("Unaligned operand");
+ expect_pgm_int();
+ schm((void *)0x01, SCHM_MBU);
+ check_pgm_int_code(PGM_INT_CODE_OPERAND);
+ report_prefix_pop();
+
+ /* bits 36-61 of register 1 (flags) must be 0 */
+ report_prefix_push("Bad flags");
+ expect_pgm_int();
+ schm(NULL, 0xfffffffc);
+ check_pgm_int_code(PGM_INT_CODE_OPERAND);
+ report_prefix_pop();
+
+ /* SCHM is a privilege operation */
+ report_prefix_push("Privilege");
+ enter_pstate();
+ expect_pgm_int();
+ schm(NULL, SCHM_MBU);
+ check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
+ report_prefix_pop();
+
+ /* Normal operation */
+ report_prefix_push("Normal operation");
+ schm(NULL, SCHM_MBU);
+ report(1, "SCHM call without address");
+ report_prefix_pop();
+}
+
static struct {
const char *name;
void (*func)(void);
@@ -159,6 +193,7 @@ static struct {
{ "enumerate (stsch)", test_enumerate },
{ "enable (msch)", test_enable },
{ "sense (ssch/tsch)", test_sense },
+ { "measurement block (schm)", test_schm },
{ NULL, NULL }
};
--
2.17.1
