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Commit fc8effa4 authored by Ian Munsie's avatar Ian Munsie Committed by Benjamin Herrenschmidt
Browse files

powerpc: Enable relocation on during exceptions at boot 



We currently do this synchronously at boot from setup_arch. On a large
system this could hypothetically take a little while to complete, so
currently we will give up if we are asked to wait for more than a second
in total.

If we actually start hitting that timeout in practice we can always move
this code into a kernel thread to take care of it in the background.

Signed-off-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent cca55d9d

arch/powerpc/platforms/pseries/setup.c

+38 −0
Original line number Diff line number Diff line
@@ -367,6 +367,36 @@ static void pSeries_idle(void) 
	}

}



/*

 * Enable relocation on during exceptions. This has partition wide scope and

 * may take a while to complete, if it takes longer than one second we will

 * just give up rather than wasting any more time on this - if that turns out

 * to ever be a problem in practice we can move this into a kernel thread to

 * finish off the process later in boot.

 */

static int __init pSeries_enable_reloc_on_exc(void)

{

	long rc;

	unsigned int delay, total_delay = 0;



	while (1) {

		rc = enable_reloc_on_exceptions();

		if (!H_IS_LONG_BUSY(rc))

			return rc;



		delay = get_longbusy_msecs(rc);

		total_delay += delay;

		if (total_delay > 1000) {

			pr_warn("Warning: Giving up waiting to enable "

				"relocation on exceptions (%u msec)!\n",

				total_delay);

			return rc;

		}



		mdelay(delay);

	}

}



static void __init pSeries_setup_arch(void)

{

	panic_timeout = 10;
@@ -402,6 +432,14 @@ static void __init pSeries_setup_arch(void) 
		ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;

	else

		ppc_md.enable_pmcs = power4_enable_pmcs;



	if (firmware_has_feature(FW_FEATURE_SET_MODE)) {

		long rc;

		if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {

			pr_warn("Unable to enable relocation on exceptions: "

				"%ld\n", rc);

		}

	}

}



static int __init pSeries_init_panel(void)