powerpc/pseries: make max polling consistent for longer H_CALLs

JIRA: https://issues.redhat.com/browse/RHEL-79919

commit 7843543
Author: Nayna Jain <[email protected]>
Date:   Wed Apr 17 23:12:30 2024 -0400

    powerpc/pseries: make max polling consistent for longer H_CALLs

    Currently, plpks_confirm_object_flushed() function polls for 5msec in
    total instead of 5sec.

    Keep max polling time consistent for all the H_CALLs, which take longer
    than expected, to be 5sec. Also, make use of fsleep() everywhere to
    insert delay.

    Reported-by: Nageswara R Sastry <[email protected]>
    Fixes: 2454a7a ("powerpc/pseries: define driver for Platform KeyStore")
    Signed-off-by: Nayna Jain <[email protected]>
    Tested-by: Nageswara R Sastry <[email protected]>
    Reviewed-by: Andrew Donnellan <[email protected]>
    Signed-off-by: Michael Ellerman <[email protected]>
    Link: https://msgid.link/[email protected]

Signed-off-by: Mamatha Inamdar <[email protected]>

Author: Mamatha Inamdar

arch/powerpc/include/asm/plpks.h

@@ -44,9 +44,8 @@
 #define PLPKS_MAX_DATA_SIZE		4000
 
 // Timeouts for PLPKS operations
-#define PLPKS_MAX_TIMEOUT		5000 // msec
-#define PLPKS_FLUSH_SLEEP		10 // msec
-#define PLPKS_FLUSH_SLEEP_RANGE		400
+#define PLPKS_MAX_TIMEOUT		(5 * USEC_PER_SEC)
+#define PLPKS_FLUSH_SLEEP		10000 // usec
 
 struct plpks_var {
 	char *component;

arch/powerpc/platforms/pseries/plpks.c

@@ -415,8 +415,7 @@ static int plpks_confirm_object_flushed(struct label *label,
 			break;
 		}
 
-		usleep_range(PLPKS_FLUSH_SLEEP,
-			     PLPKS_FLUSH_SLEEP + PLPKS_FLUSH_SLEEP_RANGE);
+		fsleep(PLPKS_FLUSH_SLEEP);
 		timeout = timeout + PLPKS_FLUSH_SLEEP;
 	} while (timeout < PLPKS_MAX_TIMEOUT);
 
@@ -464,9 +463,10 @@ int plpks_signed_update_var(struct plpks_var *var, u64 flags)
 
 		continuetoken = retbuf[0];
 		if (pseries_status_to_err(rc) == -EBUSY) {
-			int delay_ms = get_longbusy_msecs(rc);
-			mdelay(delay_ms);
-			timeout += delay_ms;
+			int delay_us = get_longbusy_msecs(rc) * 1000;
+
+			fsleep(delay_us);
+			timeout += delay_us;
 		}
 		rc = pseries_status_to_err(rc);
 	} while (rc == -EBUSY && timeout < PLPKS_MAX_TIMEOUT);