| Message ID | 1591603981-16879-12-git-send-email-pmorel@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | s390x: Testing the Channel Subsystem I/O | expand |
On 08/06/2020 10.13, Pierre Morel wrote: > A second step when testing the channel subsystem is to prepare a channel > for use. > This includes: > - Get the current subchannel Information Block (SCHIB) using STSCH > - Update it in memory to set the ENABLE bit > - Tell the CSS that the SCHIB has been modified using MSCH > - Get the SCHIB from the CSS again to verify that the subchannel is > enabled. > - If the command succeeds but subchannel is not enabled retry a > predefined retries count. > - If the command fails, report the failure and do not retry, even > if cc indicates a busy/status pending as we do not expect this. > > This tests the MSCH instruction to enable a channel succesfuly. > This some retries are done and in case of error, and if the retries > count is exceeded, a report is made. > > Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> > --- > lib/s390x/css_lib.c | 60 +++++++++++++++++++++++++++++++++++++++++++++ > s390x/css.c | 18 ++++++++++++++ > 2 files changed, 78 insertions(+) > > diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c > index dc5a512..831a116 100644 > --- a/lib/s390x/css_lib.c > +++ b/lib/s390x/css_lib.c > @@ -15,6 +15,7 @@ > #include <string.h> > #include <interrupt.h> > #include <asm/arch_def.h> > +#include <asm/time.h> > > #include <css.h> > > @@ -68,3 +69,62 @@ out: > scn, scn_found, dev_found); > return schid; > } > + > +int css_enable(int schid) > +{ > + struct pmcw *pmcw = &schib.pmcw; > + int retry_count = 0; > + int cc; > + > + /* Read the SCHIB for this subchannel */ > + cc = stsch(schid, &schib); > + if (cc) { > + report_info("stsch failed with cc=%d", cc); > + return cc; > + } > + > + if (pmcw->flags & PMCW_ENABLE) { > + report_info("stsch: sch %08x already enabled", schid); > + return 0; > + } > + > +retry: > + /* Update the SCHIB to enable the channel */ > + pmcw->flags |= PMCW_ENABLE; > + > + /* Tell the CSS we want to modify the subchannel */ > + cc = msch(schid, &schib); > + if (cc) { > + /* > + * If the subchannel is status pending or > + * if a function is in progress, > + * we consider both cases as errors. > + */ > + report_info("msch failed with cc=%d", cc); > + return cc; > + } > + > + /* > + * Read the SCHIB again to verify the enablement > + */ > + cc = stsch(schid, &schib); > + if (cc) { > + report_info("stsch failed with cc=%d", cc); > + return cc; > + } > + > + if (pmcw->flags & PMCW_ENABLE) { > + report_info("Subchannel %08x enabled after %d retries", > + schid, retry_count); > + return 0; > + } > + > + if (retry_count++ < MAX_ENABLE_RETRIES) { > + mdelay(10); /* the hardware was not ready, give it some time */ > + goto retry; > + } > + > + report_info("msch: enabling sch %08x failed after %d retries. pmcw flags: %x", > + schid, retry_count, pmcw->flags); > + return -1; > +} > diff --git a/s390x/css.c b/s390x/css.c > index f0e8f47..6f58d4a 100644 > --- a/s390x/css.c > +++ b/s390x/css.c > @@ -40,11 +40,29 @@ static void test_enumerate(void) > } > } > > +static void test_enable(void) > +{ > + int cc; > + > + if (!test_device_sid) { > + report_skip("No device"); > + return; > + } > + > + cc = css_enable(test_device_sid); > + > + if (cc) > + report(0, "Failed to enable subchannel %08x", test_device_sid); > + else > + report(1, "Subchannel %08x enabled", test_device_sid); Could you please write this as: report(cc == 1, "Enable subchannel %08x", test_device_sid); ... checking for a right value is the whole point of the first parameter of report() :-) Thanks, Thomas
On 2020-06-09 09:47, Thomas Huth wrote: > On 08/06/2020 10.13, Pierre Morel wrote: >> A second step when testing the channel subsystem is to prepare a channel >> for use. >> This includes: >> - Get the current subchannel Information Block (SCHIB) using STSCH >> - Update it in memory to set the ENABLE bit >> - Tell the CSS that the SCHIB has been modified using MSCH >> - Get the SCHIB from the CSS again to verify that the subchannel is >> enabled. >> - If the command succeeds but subchannel is not enabled retry a >> predefined retries count. >> - If the command fails, report the failure and do not retry, even >> if cc indicates a busy/status pending as we do not expect this. >> >> This tests the MSCH instruction to enable a channel succesfuly. >> This some retries are done and in case of error, and if the retries >> count is exceeded, a report is made. >> >> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> >> --- >> lib/s390x/css_lib.c | 60 +++++++++++++++++++++++++++++++++++++++++++++ >> s390x/css.c | 18 ++++++++++++++ >> 2 files changed, 78 insertions(+) >> >> diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c >> index dc5a512..831a116 100644 >> --- a/lib/s390x/css_lib.c >> +++ b/lib/s390x/css_lib.c >> @@ -15,6 +15,7 @@ >> #include <string.h> >> #include <interrupt.h> >> #include <asm/arch_def.h> >> +#include <asm/time.h> >> >> #include <css.h> >> >> @@ -68,3 +69,62 @@ out: >> scn, scn_found, dev_found); >> return schid; >> } >> + >> +int css_enable(int schid) >> +{ >> + struct pmcw *pmcw = &schib.pmcw; >> + int retry_count = 0; >> + int cc; >> + >> + /* Read the SCHIB for this subchannel */ >> + cc = stsch(schid, &schib); >> + if (cc) { >> + report_info("stsch failed with cc=%d", cc); >> + return cc; >> + } >> + >> + if (pmcw->flags & PMCW_ENABLE) { >> + report_info("stsch: sch %08x already enabled", schid); >> + return 0; >> + } >> + >> +retry: >> + /* Update the SCHIB to enable the channel */ >> + pmcw->flags |= PMCW_ENABLE; >> + >> + /* Tell the CSS we want to modify the subchannel */ >> + cc = msch(schid, &schib); >> + if (cc) { >> + /* >> + * If the subchannel is status pending or >> + * if a function is in progress, >> + * we consider both cases as errors. >> + */ >> + report_info("msch failed with cc=%d", cc); >> + return cc; >> + } >> + >> + /* >> + * Read the SCHIB again to verify the enablement >> + */ >> + cc = stsch(schid, &schib); >> + if (cc) { >> + report_info("stsch failed with cc=%d", cc); >> + return cc; >> + } >> + >> + if (pmcw->flags & PMCW_ENABLE) { >> + report_info("Subchannel %08x enabled after %d retries", >> + schid, retry_count); >> + return 0; >> + } >> + >> + if (retry_count++ < MAX_ENABLE_RETRIES) { >> + mdelay(10); /* the hardware was not ready, give it some time */ >> + goto retry; >> + } >> + >> + report_info("msch: enabling sch %08x failed after %d retries. pmcw flags: %x", >> + schid, retry_count, pmcw->flags); >> + return -1; >> +} >> diff --git a/s390x/css.c b/s390x/css.c >> index f0e8f47..6f58d4a 100644 >> --- a/s390x/css.c >> +++ b/s390x/css.c >> @@ -40,11 +40,29 @@ static void test_enumerate(void) >> } >> } >> >> +static void test_enable(void) >> +{ >> + int cc; >> + >> + if (!test_device_sid) { >> + report_skip("No device"); >> + return; >> + } >> + >> + cc = css_enable(test_device_sid); >> + >> + if (cc) >> + report(0, "Failed to enable subchannel %08x", test_device_sid); >> + else >> + report(1, "Subchannel %08x enabled", test_device_sid); > > Could you please write this as: > > report(cc == 1, "Enable subchannel %08x", test_device_sid); > > ... checking for a right value is the whole point of the first parameter > of report() :-) > > Thanks, > Thomas > OK, thanks, Pierre
diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c index dc5a512..831a116 100644 --- a/lib/s390x/css_lib.c +++ b/lib/s390x/css_lib.c @@ -15,6 +15,7 @@ #include <string.h> #include <interrupt.h> #include <asm/arch_def.h> +#include <asm/time.h> #include <css.h> @@ -68,3 +69,62 @@ out: scn, scn_found, dev_found); return schid; } + +int css_enable(int schid) +{ + struct pmcw *pmcw = &schib.pmcw; + int retry_count = 0; + int cc; + + /* Read the SCHIB for this subchannel */ + cc = stsch(schid, &schib); + if (cc) { + report_info("stsch failed with cc=%d", cc); + return cc; + } + + if (pmcw->flags & PMCW_ENABLE) { + report_info("stsch: sch %08x already enabled", schid); + return 0; + } + +retry: + /* Update the SCHIB to enable the channel */ + pmcw->flags |= PMCW_ENABLE; + + /* Tell the CSS we want to modify the subchannel */ + cc = msch(schid, &schib); + if (cc) { + /* + * If the subchannel is status pending or + * if a function is in progress, + * we consider both cases as errors. + */ + report_info("msch failed with cc=%d", cc); + return cc; + } + + /* + * Read the SCHIB again to verify the enablement + */ + cc = stsch(schid, &schib); + if (cc) { + report_info("stsch failed with cc=%d", cc); + return cc; + } + + if (pmcw->flags & PMCW_ENABLE) { + report_info("Subchannel %08x enabled after %d retries", + schid, retry_count); + return 0; + } + + if (retry_count++ < MAX_ENABLE_RETRIES) { + mdelay(10); /* the hardware was not ready, give it some time */ + goto retry; + } + + report_info("msch: enabling sch %08x failed after %d retries. pmcw flags: %x", + schid, retry_count, pmcw->flags); + return -1; +} diff --git a/s390x/css.c b/s390x/css.c index f0e8f47..6f58d4a 100644 --- a/s390x/css.c +++ b/s390x/css.c @@ -40,11 +40,29 @@ static void test_enumerate(void) } } +static void test_enable(void) +{ + int cc; + + if (!test_device_sid) { + report_skip("No device"); + return; + } + + cc = css_enable(test_device_sid); + + if (cc) + report(0, "Failed to enable subchannel %08x", test_device_sid); + else + report(1, "Subchannel %08x enabled", test_device_sid); +} + static struct { const char *name; void (*func)(void); } tests[] = { { "enumerate (stsch)", test_enumerate }, + { "enable (msch)", test_enable }, { NULL, NULL } };
A second step when testing the channel subsystem is to prepare a channel for use. This includes: - Get the current subchannel Information Block (SCHIB) using STSCH - Update it in memory to set the ENABLE bit - Tell the CSS that the SCHIB has been modified using MSCH - Get the SCHIB from the CSS again to verify that the subchannel is enabled. - If the command succeeds but subchannel is not enabled retry a predefined retries count. - If the command fails, report the failure and do not retry, even if cc indicates a busy/status pending as we do not expect this. This tests the MSCH instruction to enable a channel succesfuly. This some retries are done and in case of error, and if the retries count is exceeded, a report is made. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> --- lib/s390x/css_lib.c | 60 +++++++++++++++++++++++++++++++++++++++++++++ s390x/css.c | 18 ++++++++++++++ 2 files changed, 78 insertions(+)