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powerpc/xive: Add a kernel parameter for StoreEOI

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StoreEOI is activated by default on platforms supporting the feature
(POWER10) and will be used as soon as firmware advertises its
availability. The kernel parameter provides a way to deactivate its
use. It can be still be reactivated through debugfs.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211105102636.1016378-10-clg@kaod.org
This commit is contained in:
Cédric Le Goater
2021-11-05 11:26:34 +01:00
committed by Michael Ellerman
parent d7bc1e376c
commit c21ee04f11
2 changed files with 19 additions and 0 deletions
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13
arch/powerpc/sysdev/xive/common.c
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@@ -1712,6 +1712,19 @@ static int __init xive_off(char *arg)
}
__setup("xive=off", xive_off);
static int __init xive_store_eoi_cmdline(char *arg)
{
if (!arg)
return -EINVAL;
if (strncmp(arg, "off", 3) == 0) {
pr_info("StoreEOI disabled on kernel command line\n");
xive_store_eoi = false;
}
return 0;
}
__setup("xive.store-eoi=", xive_store_eoi_cmdline);
#ifdef CONFIG_DEBUG_FS
static void xive_debug_show_ipi(struct seq_file *m, int cpu)
{