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powerpc/powernv: opal-kmsg standardise OPAL_BUSY handling 

OPAL_CONSOLE_FLUSH is documented as being able to return OPAL_BUSY,
so implement the standard OPAL_BUSY handling for it.

Reviewed-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2018-05-01 00:55:46 +10:00 committed by Michael Ellerman
parent 36d2dabc87
commit 3a80bfc7ea
1 changed files with 16 additions and 8 deletions
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24
arch/powerpc/platforms/powernv/opal-kmsg.c
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@ -12,6 +12,7 @@
*/
#include <linux/kmsg_dump.h>
#include <linux/delay.h>
#include <asm/opal.h>
#include <asm/opal-api.h>
@ -26,8 +27,7 @@
static void force_opal_console_flush(struct kmsg_dumper *dumper,
enum kmsg_dump_reason reason)
{
int i;
int64_t ret;
s64 rc;
/*
* Outside of a panic context the pollers will continue to run,
@ -37,14 +37,22 @@ static void force_opal_console_flush(struct kmsg_dumper *dumper,
return;
if (opal_check_token(OPAL_CONSOLE_FLUSH)) {
ret = opal_console_flush(0);
do {
rc = OPAL_BUSY;
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_console_flush(0);
if (rc == OPAL_BUSY_EVENT) {
mdelay(OPAL_BUSY_DELAY_MS);
opal_poll_events(NULL);
} else if (rc == OPAL_BUSY) {
mdelay(OPAL_BUSY_DELAY_MS);
}
}
} while (rc == OPAL_PARTIAL); /* More to flush */
if (ret == OPAL_UNSUPPORTED || ret == OPAL_PARAMETER)
return;
/* Incrementally flush until there's nothing left */
while (opal_console_flush(0) != OPAL_SUCCESS);
} else {
int i;
/*
* If OPAL_CONSOLE_FLUSH is not implemented in the firmware,
* the console can still be flushed by calling the polling