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Commit 028555a5 authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Michael Ellerman
Browse files

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



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: default avatarCédric Le Goater <clg@kaod.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent d2b04b0c

arch/powerpc/sysdev/xive/spapr.c

+47 −5
Original line number Diff line number Diff line
@@ -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);

}



/*