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powerpc/xive: fix hcall H_INT_RESET to support long busy delays

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The hcall H_INT_RESET can take some time to complete and in such cases
it returns H_LONG_BUSY_* codes requiring the machine to sleep for a
while before retrying.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Cédric Le Goater 2018-05-08 09:05:15 +02:00 committed by Michael Ellerman
parent d2b04b0c78
commit 028555a590
1 changed files with 47 additions and 5 deletions
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52
arch/powerpc/sysdev/xive/spapr.c
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@ -19,6 +19,7 @@
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <asm/prom.h>
#include <asm/io.h>
@ -108,6 +109,51 @@ static void xive_irq_bitmap_free(int irq)
}
}
/* Based on the similar routines in RTAS */
static unsigned int plpar_busy_delay_time(long rc)
{
unsigned int ms = 0;
if (H_IS_LONG_BUSY(rc)) {
ms = get_longbusy_msecs(rc);
} else if (rc == H_BUSY) {
ms = 10; /* seems appropriate for XIVE hcalls */
}
return ms;
}
static unsigned int plpar_busy_delay(int rc)
{
unsigned int ms;
ms = plpar_busy_delay_time(rc);
if (ms)
mdelay(ms);
return ms;
}
/*
* Note: this call has a partition wide scope and can take a while to
* complete. If it returns H_LONG_BUSY_* it should be retried
* periodically.
*/
static long plpar_int_reset(unsigned long flags)
{
long rc;
do {
rc = plpar_hcall_norets(H_INT_RESET, flags);
} while (plpar_busy_delay(rc));
if (rc)
pr_err("H_INT_RESET failed %ld\n", rc);
return rc;
}
static long plpar_int_get_source_info(unsigned long flags,
unsigned long lisn,
unsigned long *src_flags,
@ -445,11 +491,7 @@ static void xive_spapr_put_ipi(unsigned int cpu, struct xive_cpu *xc)
static void xive_spapr_shutdown(void)
{
long rc;
rc = plpar_hcall_norets(H_INT_RESET, 0);
if (rc)
pr_err("H_INT_RESET failed %ld\n", rc);
plpar_int_reset(0);
}
/*